1、【增加】初始版本。

Signed-off-by: armink <armink.ztl@gmail.com>

README.md

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+# Mongoose - Embedded Web Server / Embedded Networking Library
+
+![](https://img.shields.io/badge/license-GPL_2-green.svg "License")
+
+Mongoose is ideal for embedded environments. It has been designed
+for connecting devices and bringing them online. On the market since 2004,
+used by vast number of open source and
+commercial products - it even runs on the International Space station!
+Mongoose makes embedded network programming fast, robust, and easy.
+
+- [Download Mongoose Source Code here](https://www.cesanta.com/download.html)
+
+Looking for a complete IoT firmware solution?
+
+Check out [Mongoose OS](https://mongoose-os.com) - open source embedded operating system for low-power connected microcontrollers. Secure, designed for Internet of Things, complete environment for prototyping, development and managing.
+
+# Support
+- [Study mongoose example code](https://github.com/cesanta/mongoose/tree/master/examples)
+- [Read User Guide and API reference](https://docs.cesanta.com/mongoose)
+- [Support Forum - ask your technical questions here](https://forum.mongoose-os.com/categories/mongoose)
+- [Commercial licensing and support available](https://www.cesanta.com/licensing.html)
+- [Check our latest releases](https://github.com/cesanta/mongoose/releases)
+
+# Features
+
+* Cross-platform: works on Linux/UNIX, MacOS, QNX, eCos, Windows, Android,
+  iPhone, FreeRTOS (TI CC3200, ESP8266), etc
+* Supported hardware platforms: TI CC3200, TI MSP432, NRF52, STM32, PIC32, ESP8266, ESP32 and more
+* Builtin protocols:
+   - plain TCP, plain UDP, SSL/TLS (over TCP, one-way or two-way)
+   - HTTP client, HTTP server
+   - WebSocket client, WebSocket server
+   - MQTT client, MQTT broker
+   - CoAP client, CoAP server
+   - DNS client, DNS server, async DNS resolver
+* Single-threaded, asynchronous, non-blocking core with simple event-based API
+* Native support for [PicoTCP embedded TCP/IP stack](http://www.picotcp.com),
+  [LWIP embedded TCP/IP stack](https://en.wikipedia.org/wiki/LwIP)
+* Tiny static and run-time footprint
+* Source code is both ISO C and ISO C++ compliant
+* Very easy to integrate: just copy
+  [mongoose.c](https://raw.githubusercontent.com/cesanta/mongoose/master/mongoose.c) and
+  [mongoose.h](https://raw.githubusercontent.com/cesanta/mongoose/master/mongoose.h)
+  files to your build tree
+
+# Licensing
+
+Mongoose is released under Commercial and [GNU GPL v.2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html) open source licenses.
+
+Commercial Projects: [Contact us for commercial license.](https://www.cesanta.com/contact.html)
+
+# Dashboard Example
+
+Mongoose is often used to implement device dashboards and real-time
+data exchange over Websocket. Here is a dashboard example that illustrates
+the functionality:
+
+![](http://www.cesanta.com/images/dashboard.png)
+
+[Developing a new product? Contact us today to discuss how Mongoose can help.](https://www.cesanta.com/contact.html)
+
+# Contributions
+
+To submit contributions, sign [Cesanta CLA](https://cesanta.com/cla.html)
+and send GitHub pull request. You retain the copyright on your contributions.
+
+# Looking for a pre-compiled Mongoose web server Windows or Mac binary?
+- [Download pre-compiled Mongoose web server binary.](https://www.cesanta.com/binary.html)

SConscript

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+from building import *
+
+# get current directory
+cwd     = GetCurrentDir()
+# The set of source files associated with this SConscript file.
+src     = Glob('*.c')
+
+path    = [cwd]
+
+CPPDEFINES = ['MG_LOCALS']
+
+group = DefineGroup('Mongoose', src, depend = [''], CPPPATH = path, CPPDEFINES = CPPDEFINES)
+
+Return('group')

demo/connected_device_4/server.c

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+// Copyright (c) 2015 Cesanta Software Limited
+// All rights reserved
+
+#define LOG_TAG    "mg.demo.cc4"
+
+#include <elog.h>
+#include <finsh.h>
+#include "mongoose.h"
+
+struct device_settings {
+    char setting1[100];
+    char setting2[100];
+};
+
+static const char *s_http_port = "8000";
+static struct mg_serve_http_opts s_http_server_opts;
+static struct device_settings s_settings = { "value1", "value2" };
+
+static void handle_save(struct mg_connection *nc, struct http_message *hm) {
+    // Get form variables and store settings values
+    mg_get_http_var(&hm->body, "setting1", s_settings.setting1, sizeof(s_settings.setting1));
+    mg_get_http_var(&hm->body, "setting2", s_settings.setting2, sizeof(s_settings.setting2));
+
+    // Send response
+    mg_http_send_redirect(nc, 302, mg_mk_str("/"), mg_mk_str(NULL));
+}
+
+static void handle_get_cpu_usage(struct mg_connection *nc) {
+    // Generate random value, as an example of changing CPU usage
+    // Getting real CPU usage depends on the OS.
+    extern void cpu_usage_get(rt_uint8_t *major, rt_uint8_t *minor);
+    float cpu_usage;
+    uint8_t cpu_usage_major, cpu_usage_minor;
+
+    cpu_usage_get(&cpu_usage_major, &cpu_usage_minor);
+    cpu_usage = (float) cpu_usage_major + ((float) cpu_usage_minor) / 100.0f;
+
+    // Use chunked encoding in order to avoid calculating Content-Length
+    mg_printf(nc, "%s", "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n");
+
+    // Output JSON object which holds CPU usage data
+    mg_printf_http_chunk(nc, "{ \"result\": %f }", cpu_usage);
+
+    // Send empty chunk, the end of response
+    mg_send_http_chunk(nc, "", 0);
+}
+
+static void handle_ssi_call(struct mg_connection *nc, const char *param) {
+    if (strcmp(param, "setting1") == 0) {
+        mg_printf_html_escape(nc, "%s", s_settings.setting1);
+    } else if (strcmp(param, "setting2") == 0) {
+        mg_printf_html_escape(nc, "%s", s_settings.setting2);
+    }
+}
+
+static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
+    struct http_message *hm = (struct http_message *) ev_data;
+
+    switch (ev) {
+    case MG_EV_HTTP_REQUEST:
+        if (mg_vcmp(&hm->uri, "/save") == 0) {
+            handle_save(nc, hm);
+        } else if (mg_vcmp(&hm->uri, "/get_cpu_usage") == 0) {
+            handle_get_cpu_usage(nc);
+        } else {
+            mg_serve_http(nc, hm, s_http_server_opts);  // Serve static content
+        }
+        break;
+    case MG_EV_SSI_CALL:
+        handle_ssi_call(nc, ev_data);
+        break;
+    default:
+        break;
+    }
+}
+
+static void push_data_to_all_websocket_connections(struct mg_mgr *m) {
+    struct mg_connection *c;
+    rt_uint32_t total_mem, usage_memory, max_used_mem;
+
+    rt_memory_info(&total_mem, &usage_memory, &max_used_mem);
+
+    for (c = mg_next(m, NULL); c != NULL; c = mg_next(m, c)) {
+        if (c->flags & MG_F_IS_WEBSOCKET) {
+            mg_printf_websocket_frame(c, WEBSOCKET_OP_TEXT, "%d", usage_memory);
+        }
+    }
+}
+
+static void connected_device_entry(void *param) {
+    struct mg_mgr mgr;
+    struct mg_connection *nc;
+    cs_stat_t st;
+
+    mg_mgr_init(&mgr, NULL);
+    nc = mg_bind(&mgr, s_http_port, ev_handler);
+    if (nc == NULL) {
+        log_e("Cannot bind to %s", s_http_port);
+        exit(1);
+    }
+
+    // Set up HTTP server parameters
+    mg_set_protocol_http_websocket(nc);
+    s_http_server_opts.document_root = "web_root";  // Set up web root directory
+
+    if (mg_stat(s_http_server_opts.document_root, &st) != 0) {
+        log_e("%s", "Cannot find web_root directory, exiting...");
+        exit(1);
+    }
+
+    log_i("Starting web server on port %s", s_http_port);
+    for (;;) {
+        static time_t last_time;
+        time_t now = time(NULL);
+        mg_mgr_poll(&mgr, 1000);
+        if (now - last_time > 0) {
+            push_data_to_all_websocket_connections(&mgr);
+            last_time = now;
+        }
+        rt_thread_delay(rt_tick_from_millisecond(10));
+    }
+//    mg_mgr_free(&mgr);
+}
+
+static void mg_demo_cc4(uint8_t argc, char **argv) {
+    /* ³õʼ»¯Íê³É */
+    static bool init_ok = false;
+
+    if(init_ok) {
+        rt_kprintf("already start Mongoose Demo: connected device 4\n");
+        return;
+    }
+
+    rt_thread_t thread = rt_thread_create("mg_demo_cc4", connected_device_entry, NULL, 4096, 18, 25);
+    if (thread) {
+        rt_thread_startup(thread);
+        /* ³õʼ»¯Íê³É */
+        init_ok = true;
+    }
+}
+MSH_CMD_EXPORT(mg_demo_cc4, Mongoose Demo connected device 4);

demo/connected_device_4/web_root/index.shtml

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8" />
+  <title>Connected device demo</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <link rel="stylesheet" type="text/css" href="style.css">
+  <script type="text/javascript" src="jquery-1.11.3.min.js"></script>
+  <script src="jquery.flot.min.js"></script>
+  <script src="jquery.flot.time.js"></script>
+  <script type="text/javascript" src="main.js"></script>
+</head>
+<body>
+  <div class="content">
+    <img src="logo.png" style="float:right; height: 50px; border-radius: 3px;">
+    <h1>Connected device demo - Websocket push</h1>
+
+    <p>
+      This page is one of the series of examples that show how to make
+      devices connected with Mongoose. Here we add a real-time Websocket
+      server push, and update dashboard graph as data arrives.
+    </p>
+
+    <h1>Settings section</h1>
+    <form method="POST" action="/save">
+      <fieldset>
+        <legend>Device settings</legend>
+        <label>Setting 1:</label> <input type="text"
+          name="setting1" value="<!--#call setting1 -->" >
+        <label>Setting 2:</label> <input type="text"
+          name="setting2" value="<!--#call setting2 -->" >
+
+        <div>
+          <button type="submit">Save Settings</button>
+        </div>
+
+      </fieldset>
+    </form>
+
+    <h1>Dashboard section</h1>
+    <label>CPU usage:</label> <span id="cpu_usage">&nbsp;</span>
+    <div id="graphs"></div>
+
+  </div>
+</body>
+</html>

demo/connected_device_4/web_root/jquery.flot.time.js

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+/* Pretty handling of time axes.
+
+Copyright (c) 2007-2014 IOLA and Ole Laursen.
+Licensed under the MIT license.
+
+Set axis.mode to "time" to enable. See the section "Time series data" in
+API.txt for details.
+
+*/
+
+(function($) {
+
+	var options = {
+		xaxis: {
+			timezone: null,		// "browser" for local to the client or timezone for timezone-js
+			timeformat: null,	// format string to use
+			twelveHourClock: false,	// 12 or 24 time in time mode
+			monthNames: null	// list of names of months
+		}
+	};
+
+	// round to nearby lower multiple of base
+
+	function floorInBase(n, base) {
+		return base * Math.floor(n / base);
+	}
+
+	// Returns a string with the date d formatted according to fmt.
+	// A subset of the Open Group's strftime format is supported.
+
+	function formatDate(d, fmt, monthNames, dayNames) {
+
+		if (typeof d.strftime == "function") {
+			return d.strftime(fmt);
+		}
+
+		var leftPad = function(n, pad) {
+			n = "" + n;
+			pad = "" + (pad == null ? "0" : pad);
+			return n.length == 1 ? pad + n : n;
+		};
+
+		var r = [];
+		var escape = false;
+		var hours = d.getHours();
+		var isAM = hours < 12;
+
+		if (monthNames == null) {
+			monthNames = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
+		}
+
+		if (dayNames == null) {
+			dayNames = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
+		}
+
+		var hours12;
+
+		if (hours > 12) {
+			hours12 = hours - 12;
+		} else if (hours == 0) {
+			hours12 = 12;
+		} else {
+			hours12 = hours;
+		}
+
+		for (var i = 0; i < fmt.length; ++i) {
+
+			var c = fmt.charAt(i);
+
+			if (escape) {
+				switch (c) {
+					case 'a': c = "" + dayNames[d.getDay()]; break;
+					case 'b': c = "" + monthNames[d.getMonth()]; break;
+					case 'd': c = leftPad(d.getDate()); break;
+					case 'e': c = leftPad(d.getDate(), " "); break;
+					case 'h':	// For back-compat with 0.7; remove in 1.0
+					case 'H': c = leftPad(hours); break;
+					case 'I': c = leftPad(hours12); break;
+					case 'l': c = leftPad(hours12, " "); break;
+					case 'm': c = leftPad(d.getMonth() + 1); break;
+					case 'M': c = leftPad(d.getMinutes()); break;
+					// quarters not in Open Group's strftime specification
+					case 'q':
+						c = "" + (Math.floor(d.getMonth() / 3) + 1); break;
+					case 'S': c = leftPad(d.getSeconds()); break;
+					case 'y': c = leftPad(d.getFullYear() % 100); break;
+					case 'Y': c = "" + d.getFullYear(); break;
+					case 'p': c = (isAM) ? ("" + "am") : ("" + "pm"); break;
+					case 'P': c = (isAM) ? ("" + "AM") : ("" + "PM"); break;
+					case 'w': c = "" + d.getDay(); break;
+				}
+				r.push(c);
+				escape = false;
+			} else {
+				if (c == "%") {
+					escape = true;
+				} else {
+					r.push(c);
+				}
+			}
+		}
+
+		return r.join("");
+	}
+
+	// To have a consistent view of time-based data independent of which time
+	// zone the client happens to be in we need a date-like object independent
+	// of time zones.  This is done through a wrapper that only calls the UTC
+	// versions of the accessor methods.
+
+	function makeUtcWrapper(d) {
+
+		function addProxyMethod(sourceObj, sourceMethod, targetObj, targetMethod) {
+			sourceObj[sourceMethod] = function() {
+				return targetObj[targetMethod].apply(targetObj, arguments);
+			};
+		};
+
+		var utc = {
+			date: d
+		};
+
+		// support strftime, if found
+
+		if (d.strftime != undefined) {
+			addProxyMethod(utc, "strftime", d, "strftime");
+		}
+
+		addProxyMethod(utc, "getTime", d, "getTime");
+		addProxyMethod(utc, "setTime", d, "setTime");
+
+		var props = ["Date", "Day", "FullYear", "Hours", "Milliseconds", "Minutes", "Month", "Seconds"];
+
+		for (var p = 0; p < props.length; p++) {
+			addProxyMethod(utc, "get" + props[p], d, "getUTC" + props[p]);
+			addProxyMethod(utc, "set" + props[p], d, "setUTC" + props[p]);
+		}
+
+		return utc;
+	};
+
+	// select time zone strategy.  This returns a date-like object tied to the
+	// desired timezone
+
+	function dateGenerator(ts, opts) {
+		if (opts.timezone == "browser") {
+			return new Date(ts);
+		} else if (!opts.timezone || opts.timezone == "utc") {
+			return makeUtcWrapper(new Date(ts));
+		} else if (typeof timezoneJS != "undefined" && typeof timezoneJS.Date != "undefined") {
+			var d = new timezoneJS.Date();
+			// timezone-js is fickle, so be sure to set the time zone before
+			// setting the time.
+			d.setTimezone(opts.timezone);
+			d.setTime(ts);
+			return d;
+		} else {
+			return makeUtcWrapper(new Date(ts));
+		}
+	}
+	
+	// map of app. size of time units in milliseconds
+
+	var timeUnitSize = {
+		"second": 1000,
+		"minute": 60 * 1000,
+		"hour": 60 * 60 * 1000,
+		"day": 24 * 60 * 60 * 1000,
+		"month": 30 * 24 * 60 * 60 * 1000,
+		"quarter": 3 * 30 * 24 * 60 * 60 * 1000,
+		"year": 365.2425 * 24 * 60 * 60 * 1000
+	};
+
+	// the allowed tick sizes, after 1 year we use
+	// an integer algorithm
+
+	var baseSpec = [
+		[1, "second"], [2, "second"], [5, "second"], [10, "second"],
+		[30, "second"], 
+		[1, "minute"], [2, "minute"], [5, "minute"], [10, "minute"],
+		[30, "minute"], 
+		[1, "hour"], [2, "hour"], [4, "hour"],
+		[8, "hour"], [12, "hour"],
+		[1, "day"], [2, "day"], [3, "day"],
+		[0.25, "month"], [0.5, "month"], [1, "month"],
+		[2, "month"]
+	];
+
+	// we don't know which variant(s) we'll need yet, but generating both is
+	// cheap
+
+	var specMonths = baseSpec.concat([[3, "month"], [6, "month"],
+		[1, "year"]]);
+	var specQuarters = baseSpec.concat([[1, "quarter"], [2, "quarter"],
+		[1, "year"]]);
+
+	function init(plot) {
+		plot.hooks.processOptions.push(function (plot, options) {
+			$.each(plot.getAxes(), function(axisName, axis) {
+
+				var opts = axis.options;
+
+				if (opts.mode == "time") {
+					axis.tickGenerator = function(axis) {
+
+						var ticks = [];
+						var d = dateGenerator(axis.min, opts);
+						var minSize = 0;
+
+						// make quarter use a possibility if quarters are
+						// mentioned in either of these options
+
+						var spec = (opts.tickSize && opts.tickSize[1] ===
+							"quarter") ||
+							(opts.minTickSize && opts.minTickSize[1] ===
+							"quarter") ? specQuarters : specMonths;
+
+						if (opts.minTickSize != null) {
+							if (typeof opts.tickSize == "number") {
+								minSize = opts.tickSize;
+							} else {
+								minSize = opts.minTickSize[0] * timeUnitSize[opts.minTickSize[1]];
+							}
+						}
+
+						for (var i = 0; i < spec.length - 1; ++i) {
+							if (axis.delta < (spec[i][0] * timeUnitSize[spec[i][1]]
+											  + spec[i + 1][0] * timeUnitSize[spec[i + 1][1]]) / 2
+								&& spec[i][0] * timeUnitSize[spec[i][1]] >= minSize) {
+								break;
+							}
+						}
+
+						var size = spec[i][0];
+						var unit = spec[i][1];
+
+						// special-case the possibility of several years
+
+						if (unit == "year") {
+
+							// if given a minTickSize in years, just use it,
+							// ensuring that it's an integer
+
+							if (opts.minTickSize != null && opts.minTickSize[1] == "year") {
+								size = Math.floor(opts.minTickSize[0]);
+							} else {
+
+								var magn = Math.pow(10, Math.floor(Math.log(axis.delta / timeUnitSize.year) / Math.LN10));
+								var norm = (axis.delta / timeUnitSize.year) / magn;
+
+								if (norm < 1.5) {
+									size = 1;
+								} else if (norm < 3) {
+									size = 2;
+								} else if (norm < 7.5) {
+									size = 5;
+								} else {
+									size = 10;
+								}
+
+								size *= magn;
+							}
+
+							// minimum size for years is 1
+
+							if (size < 1) {
+								size = 1;
+							}
+						}
+
+						axis.tickSize = opts.tickSize || [size, unit];
+						var tickSize = axis.tickSize[0];
+						unit = axis.tickSize[1];
+
+						var step = tickSize * timeUnitSize[unit];
+
+						if (unit == "second") {
+							d.setSeconds(floorInBase(d.getSeconds(), tickSize));
+						} else if (unit == "minute") {
+							d.setMinutes(floorInBase(d.getMinutes(), tickSize));
+						} else if (unit == "hour") {
+							d.setHours(floorInBase(d.getHours(), tickSize));
+						} else if (unit == "month") {
+							d.setMonth(floorInBase(d.getMonth(), tickSize));
+						} else if (unit == "quarter") {
+							d.setMonth(3 * floorInBase(d.getMonth() / 3,
+								tickSize));
+						} else if (unit == "year") {
+							d.setFullYear(floorInBase(d.getFullYear(), tickSize));
+						}
+
+						// reset smaller components
+
+						d.setMilliseconds(0);
+
+						if (step >= timeUnitSize.minute) {
+							d.setSeconds(0);
+						}
+						if (step >= timeUnitSize.hour) {
+							d.setMinutes(0);
+						}
+						if (step >= timeUnitSize.day) {
+							d.setHours(0);
+						}
+						if (step >= timeUnitSize.day * 4) {
+							d.setDate(1);
+						}
+						if (step >= timeUnitSize.month * 2) {
+							d.setMonth(floorInBase(d.getMonth(), 3));
+						}
+						if (step >= timeUnitSize.quarter * 2) {
+							d.setMonth(floorInBase(d.getMonth(), 6));
+						}
+						if (step >= timeUnitSize.year) {
+							d.setMonth(0);
+						}
+
+						var carry = 0;
+						var v = Number.NaN;
+						var prev;
+
+						do {
+
+							prev = v;
+							v = d.getTime();
+							ticks.push(v);
+
+							if (unit == "month" || unit == "quarter") {
+								if (tickSize < 1) {
+
+									// a bit complicated - we'll divide the
+									// month/quarter up but we need to take
+									// care of fractions so we don't end up in
+									// the middle of a day
+
+									d.setDate(1);
+									var start = d.getTime();
+									d.setMonth(d.getMonth() +
+										(unit == "quarter" ? 3 : 1));
+									var end = d.getTime();
+									d.setTime(v + carry * timeUnitSize.hour + (end - start) * tickSize);
+									carry = d.getHours();
+									d.setHours(0);
+								} else {
+									d.setMonth(d.getMonth() +
+										tickSize * (unit == "quarter" ? 3 : 1));
+								}
+							} else if (unit == "year") {
+								d.setFullYear(d.getFullYear() + tickSize);
+							} else {
+								d.setTime(v + step);
+							}
+						} while (v < axis.max && v != prev);
+
+						return ticks;
+					};
+
+					axis.tickFormatter = function (v, axis) {
+
+						var d = dateGenerator(v, axis.options);
+
+						// first check global format
+
+						if (opts.timeformat != null) {
+							return formatDate(d, opts.timeformat, opts.monthNames, opts.dayNames);
+						}
+
+						// possibly use quarters if quarters are mentioned in
+						// any of these places
+
+						var useQuarters = (axis.options.tickSize &&
+								axis.options.tickSize[1] == "quarter") ||
+							(axis.options.minTickSize &&
+								axis.options.minTickSize[1] == "quarter");
+
+						var t = axis.tickSize[0] * timeUnitSize[axis.tickSize[1]];
+						var span = axis.max - axis.min;
+						var suffix = (opts.twelveHourClock) ? " %p" : "";
+						var hourCode = (opts.twelveHourClock) ? "%I" : "%H";
+						var fmt;
+
+						if (t < timeUnitSize.minute) {
+							fmt = hourCode + ":%M:%S" + suffix;
+						} else if (t < timeUnitSize.day) {
+							if (span < 2 * timeUnitSize.day) {
+								fmt = hourCode + ":%M" + suffix;
+							} else {
+								fmt = "%b %d " + hourCode + ":%M" + suffix;
+							}
+						} else if (t < timeUnitSize.month) {
+							fmt = "%b %d";
+						} else if ((useQuarters && t < timeUnitSize.quarter) ||
+							(!useQuarters && t < timeUnitSize.year)) {
+							if (span < timeUnitSize.year) {
+								fmt = "%b";
+							} else {
+								fmt = "%b %Y";
+							}
+						} else if (useQuarters && t < timeUnitSize.year) {
+							if (span < timeUnitSize.year) {
+								fmt = "Q%q";
+							} else {
+								fmt = "Q%q %Y";
+							}
+						} else {
+							fmt = "%Y";
+						}
+
+						var rt = formatDate(d, fmt, opts.monthNames, opts.dayNames);
+
+						return rt;
+					};
+				}
+			});
+		});
+	}
+
+	$.plot.plugins.push({
+		init: init,
+		options: options,
+		name: 'time',
+		version: '1.0'
+	});
+
+	// Time-axis support used to be in Flot core, which exposed the
+	// formatDate function on the plot object.  Various plugins depend
+	// on the function, so we need to re-expose it here.
+
+	$.plot.formatDate = formatDate;
+	$.plot.dateGenerator = dateGenerator;
+
+})(jQuery);

demo/connected_device_4/web_root/main.js

@@ -0,0 +1,75 @@
+$(document).ready(function() {
+  // Start 1-second timer to call RESTful endpoint
+  setInterval(function() {
+    $.ajax({
+      url: '/get_cpu_usage',
+      dataType: 'json',
+      success: function(json) {
+        $('#cpu_usage').text(json.result + '% ');
+      }
+    });
+  }, 1000);
+
+  // Initialize graph
+  var $c = $('<div class="graph"/>').appendTo('#graphs');
+  var dur = 120;
+  var past = Date.now() - dur * 1000;
+  var options = {
+    lines: {
+      fill: true,
+      lineWidth: 0,
+      fillColor: {colors: [ { opacity: 0 }, { opacity: 1 } ] }
+    },
+    grid: { borderWidth: 1, borderColor: '#ccc'},
+    xaxis: { mode: 'time', ticks: 5 },
+    legend: { labelBoxBorderColor: '#fff' },
+    colors: [ '#fec', '#396', '#e39', '9e2' ],
+    hooks: {
+      draw: [function(plot, canvas) {
+        canvas.font = '13px sans-serif';
+        canvas.fillStyle = '#aaa';
+        canvas.fillText('Resource Usage', 35, 25);
+      }]
+    }
+  };
+  var plot = $.plot($c, [], options);
+
+  var updateGraph = function(counter) {
+    var data = plot.getData();
+    var now = Date.now();
+    var oldest = now - dur * 1000;
+    data[0] = {
+      show: false,
+      data: [[oldest, null], [now, null]]
+    };
+
+    console.log(data);
+
+    // Remove old points
+    $.each(data, function(di, d) {
+      while (d.data.length > 0 && d.data[0][0] < oldest) {
+        d.data.shift();
+      }
+    });
+
+    // Add new points
+    var new_datapoint = [now, counter];
+    if (data[1]) {
+      data[1].label = 'memory';
+      data[1].data.push(new_datapoint);
+    } else {
+      data[1] = [{ data: [new_datapoint] }];
+    }
+
+    // Redraw the graph
+    plot.setData(data);
+    plot.setupGrid();
+    plot.draw();
+  };
+
+  // Create Websocket connection. For simplicity, no reconnect logic is here.
+  var ws = new WebSocket('ws://' + location.host);
+  ws.onmessage = function(ev) {
+    updateGraph(ev.data);
+  };
+});

demo/connected_device_4/web_root/style.css

@@ -0,0 +1,87 @@
+* {
+  outline: none;
+}
+
+body {
+  background: #36c;
+  color: #555;
+  margin: 0;
+  padding: 0;
+  font: 16px/1.4 Helvetica, Arial, sans-serif;
+}
+
+div.content {
+  width: 800px;
+  margin: 1em auto;
+  padding: 2em;
+  background-color: #fff;
+  border-radius: 1em;
+}
+
+fieldset {
+  border: 1px solid #ccc;
+  padding: 1em;
+}
+
+fieldset legend {
+  font-style: italic;
+  color: silver;
+}
+
+fieldset label {
+  text-align: right;
+  padding: 0 1em;
+}
+
+input[type=text] {
+  font-size: 100%;
+  padding: 0.2em;
+  border: 1px solid #ccc;
+}
+
+button {
+  color: #666;
+  background: #eee;
+  border: 1px solid #ccc;
+  padding: 0.2em 2em;
+  font-size: 100%;
+  cursor: pointer;
+  margin-top: 1em;
+}
+
+button:hover {
+  background: #ccc;
+}
+
+code {
+  background: #f0f0f0;
+  padding: 0 0.3em;
+  color: #396;
+  border-radius: 0.3em;
+}
+
+a:link, a:visited {
+  color: #69c;
+  text-decoration: none;
+}
+
+#graphs {
+  margin-top: 1em;
+}
+
+.graph {
+  min-height: 12em;
+  border: 0px solid #ccc;
+  position: relative;
+  margin: 0 1em 1em 0;
+  width: 36em;
+  display: inline-block;
+}
+
+.graph_title {
+  position: absolute;
+  top: 0.5em; left: 1em;
+  color: #ccc;
+  font-weight: bold;
+  z-index: 999;
+}

demo/websocket_chat/index.html

@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8" />
+  <title>WebSocket Test</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <style type="text/css">
+    body {
+      background-color: #789; margin: 0;
+      padding: 0; font: 14px Helvetica, Arial, sans-serif;
+    }
+    div.content {
+      width: 800px; margin: 2em auto; padding: 20px 50px;
+      background-color: #fff; border-radius: 1em;
+    }
+    #messages {
+      border: 2px solid #fec; border-radius: 1em;
+      height: 10em; overflow: scroll; padding: 0.5em 1em;
+    }
+    a:link, a:visited { color: #69c; text-decoration: none; }
+    @media (max-width: 700px) {
+      body { background-color: #fff; }
+      div.content {
+        width: auto; margin: 0 auto; border-radius: 0;
+        padding: 1em;
+      }
+    }
+</style>
+
+<script language="javascript" type="text/javascript">
+
+  var rooms = [];
+  var ws = new WebSocket('ws://' + "192.168.2.49:8001" + '/ws');
+
+  if (!window.console) { window.console = { log: function() {} } };
+
+  ws.onopen = function(ev)  { console.log(ev); };
+  ws.onerror = function(ev) { console.log(ev); };
+  ws.onclose = function(ev) { console.log(ev); };
+  ws.onmessage = function(ev) {
+    console.log(ev);
+    var div = document.createElement('div');
+    div.innerHTML = ev.data;
+    document.getElementById('messages').appendChild(div);
+
+  };
+
+  window.onload = function() {
+    document.getElementById('send_button').onclick = function(ev) {
+      var msg = document.getElementById('send_input').value;
+      document.getElementById('send_input').value = '';
+      ws.send(msg);
+    };
+    document.getElementById('send_input').onkeypress = function(ev) {
+      if (ev.keyCode == 13 || ev.which == 13) {
+        document.getElementById('send_button').click();
+      }
+    };
+  };
+</script>
+</head>
+<body>
+  <div class="content">
+    <h1>Websocket PubSub Demonstration</h1>
+
+    <p>
+      This page demonstrates how Mongoose could be used to implement
+      <a href="http://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern">
+       publish–subscribe pattern</a>. Open this page in several browser
+       windows. Each window initiates persistent
+       <a href="http://en.wikipedia.org/wiki/WebSocket">WebSocket</a>
+      connection with the server, making each browser window a websocket client.
+      Send messages, and see messages sent by other clients.
+    </p>
+
+    <div id="messages">
+    </div>
+
+    <p>
+      <input type="text" id="send_input" />
+      <button id="send_button">Send Message</button>
+    </p>
+  </div>
+</body>
+</html>

demo/websocket_chat/websocket_chat.c

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#define LOG_TAG    "mg.demo.wc"
+
+#include <elog.h>
+#include <finsh.h>
+
+#include "mongoose.h"
+
+static const char *s_http_port = "8001";
+
+static int is_websocket(const struct mg_connection *nc) {
+    return nc->flags & MG_F_IS_WEBSOCKET;
+}
+
+static void broadcast(struct mg_connection *nc, const struct mg_str msg) {
+    struct mg_connection *c;
+    char buf[500];
+    char addr[32];
+    mg_sock_addr_to_str(&nc->sa, addr, sizeof(addr), MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
+
+    snprintf(buf, sizeof(buf), "%s %.*s", addr, (int) msg.len, msg.p);
+    rt_kprintf("%s\n", buf); /* Local echo. */
+    for (c = mg_next(nc->mgr, NULL); c != NULL; c = mg_next(nc->mgr, c)) {
+        if (c == nc || (c->flags & MG_F_LISTENING) || !is_websocket(nc))
+            continue; /* Don't send to the sender or listen connection. */
+        mg_send_websocket_frame(c, WEBSOCKET_OP_TEXT, buf, strlen(buf));
+    }
+}
+
+static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
+    switch (ev) {
+    case MG_EV_WEBSOCKET_HANDSHAKE_DONE: {
+        /* New websocket connection. Tell everybody. */
+        broadcast(nc, mg_mk_str("++ joined"));
+        break;
+    }
+    case MG_EV_WEBSOCKET_FRAME: {
+        struct websocket_message *wm = (struct websocket_message *) ev_data;
+        /* New websocket message. Tell everybody. */
+        struct mg_str d = { (char *) wm->data, wm->size };
+        broadcast(nc, d);
+        break;
+    }
+    case MG_EV_CLOSE: {
+        /* Disconnect. Tell everybody. */
+        if (is_websocket(nc)) {
+            broadcast(nc, mg_mk_str("-- left"));
+        }
+        break;
+    }
+    }
+}
+
+static void websocket_entry(void *param) {
+    struct mg_mgr mgr;
+    struct mg_connection *nc;
+
+    mg_mgr_init(&mgr, NULL);
+
+    nc = mg_bind(&mgr, s_http_port, ev_handler);
+    mg_set_protocol_http_websocket(nc);
+
+    rt_kprintf("Started on port %s\n", s_http_port);
+    while (true) {
+        mg_mgr_poll(&mgr, 200);
+        rt_thread_delay(rt_tick_from_millisecond(200));
+    }
+
+//    mg_mgr_free(&mgr);
+}
+
+static void mg_demo_wc(uint8_t argc, char **argv) {
+    /* ³õʼ»¯Íê³É */
+    static bool init_ok = false;
+
+    if (init_ok) {
+        rt_kprintf("already start Mongoose Demo: websocket chat\n");
+        return;
+    }
+
+    rt_thread_t thread = rt_thread_create("mg_demo_wc", websocket_entry, NULL, 4096, 19, 25);
+    if (thread) {
+        rt_thread_startup(thread);
+        /* ³õʼ»¯Íê³É */
+        init_ok = true;
+    }
+}
+MSH_CMD_EXPORT(mg_demo_wc, Mongoose Demo websocket chat);

mg_locals.h

@@ -0,0 +1,62 @@
+/*
+ * File      : mg_locals.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017-08-19     armink       first version
+ */
+#ifndef _MONGOOSE_MG_LOCALS_H_
+#define _MONGOOSE_MG_LOCALS_H_
+
+#include <stdio.h>
+#include <stdint.h>
+#include <time.h>
+#include <lwip/sockets.h>
+#include <dfs_posix.h>
+#include <rtthread.h>
+
+#define CS_ENABLE_DEBUG                          0
+#define CS_PLATFORM                              CS_P_STM32
+#define CS_DEFINE_DIRENT                         0
+
+#define MG_NET_IF                                MG_NET_IF_SOCKET
+#define MG_LWIP                                  1
+#define RTOS_SDK                                 1
+
+#define MG_MALLOC                                rt_malloc
+#define MG_CALLOC                                rt_calloc
+#define MG_REALLOC                               rt_realloc
+#define MG_FREE                                  rt_free
+#define MG_STRDUP                                rt_strdup
+
+#define MG_ENABLE_MQTT                           0
+#define MG_ENABLE_HTTP_WEBSOCKET                 1
+#define MG_ENABLE_HEXDUMP                        0
+#define MG_ENABLE_FILESYSTEM                     1
+#define MG_ENABLE_HTTP_STREAMING_MULTIPART       1
+
+#define fcntl(s,cmd,val)                         lwip_fcntl(s,cmd,val)
+
+extern int gettimeofday(struct timeval *tp, void *ignore);
+/**
+ * Mongoose ¿âÒÆÖ²¹¦Äܳõʼ»¯
+ */
+void mongoose_port_init();
+
+#endif /* _MONGOOSE_MG_LOCALS_H_ */

mg_port.c

@@ -0,0 +1,255 @@
+/*
+ * File      : mg_port.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017-08-19     armink       first version
+ */
+
+#include <rtthread.h>
+#include <finsh.h>
+#include <string.h>
+#include <lwip/dhcp.h>
+#include <lwip/init.h>
+#include <lwip/netif.h>
+
+#include "mongoose.h"
+
+static rt_mutex_t mg_locker = NULL;
+
+int gettimeofday(struct timeval *tp, void *ignore)
+{
+
+    time_t time;
+    rt_device_t device;
+
+    device = rt_device_find("rtc");
+    if (device != RT_NULL)
+    {
+        rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time);
+        if (tp != RT_NULL)
+        {
+            tp->tv_sec = time;
+        }
+    }
+
+    return 0;
+}
+
+/**
+ * Mongoose ¿âÒÆÖ²¹¦Äܳõʼ»¯
+ */
+void mongoose_port_init() {
+    if (!mg_locker) {
+        mg_locker = rt_mutex_create("mg_lock", RT_IPC_FLAG_FIFO);
+    }
+}
+
+void mgos_lock(void) {
+    rt_mutex_take(mg_locker, RT_WAITING_FOREVER);
+}
+
+void mgos_unlock(void) {
+    rt_mutex_release(mg_locker);
+}
+
+static void http_server_ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
+    if (ev == MG_EV_POLL)
+        return;
+    rt_kprintf("ev %d\r\n", ev);
+    switch (ev) {
+    case MG_EV_ACCEPT: {
+        char addr[32];
+        mg_sock_addr_to_str(&nc->sa, addr, sizeof(addr),
+        MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
+        rt_kprintf("%p: Connection from %s\r\n", nc, addr);
+        break;
+    }
+    case MG_EV_HTTP_REQUEST: {
+        struct http_message *hm = (struct http_message *) ev_data;
+        char addr[32];
+        mg_sock_addr_to_str(&nc->sa, addr, sizeof(addr), MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
+        rt_kprintf("%p: %.*s %.*s\r\n", nc, (int) hm->method.len, hm->method.p, (int) hm->uri.len, hm->uri.p);
+        mg_send_response_line(nc, 200, "Content-Type: text/html\r\n"
+                "Connection: close");
+        mg_printf(nc, "\r\n<h1>Hello, %s!</h1>\r\n"
+                "You asked for %.*s\r\n", addr, (int) hm->uri.len, hm->uri.p);
+        nc->flags |= MG_F_SEND_AND_CLOSE;
+        break;
+    }
+    case MG_EV_RECV : {
+        struct mbuf *io = &nc->recv_mbuf;
+        rt_kprintf("recv data: %.*s\n", io->len, io->buf);
+        break;
+    }
+    case MG_EV_CLOSE: {
+        rt_kprintf("%p: Connection closed\r\n", nc);
+        break;
+    }
+    }
+}
+
+static void http_client_ev_handler(struct mg_connection *c, int ev, void *p) {
+    struct http_message *hm = (struct http_message *) p;
+    switch (ev) {
+    case MG_EV_HTTP_REPLY: {
+        c->flags |= MG_F_CLOSE_IMMEDIATELY;
+        rt_kprintf("%.*s\n", hm->message.len, hm->message.p);
+        break;
+    }
+    case MG_EV_CLOSE: {
+        rt_kprintf("session close\n");
+        break;
+    }
+    }
+}
+
+/*
+ * This is a callback invoked by Mongoose to signal that a poll is needed soon.
+ * Since we're in a tight polling loop anyway (see below), we don't need to do
+ * anything.
+ */
+void mg_lwip_mgr_schedule_poll(struct mg_mgr *mgr) {
+}
+
+static void thread_entry_mg_poll(void* parameter) {
+    struct mg_mgr *mgr = (struct mg_mgr *) parameter;
+    while (1) {
+        mg_mgr_poll(mgr, 0);
+        rt_thread_delay(rt_tick_from_millisecond(10));
+    }
+}
+
+void cs_log_print_prefix(const char *func) {
+    rt_kprintf("[mg:%s]", func);
+}
+
+void cs_log_printf(const char *fmt, ...) {
+    static char log_buf[RT_CONSOLEBUF_SIZE];
+    va_list args;
+
+    /* args point to the first variable parameter */
+    va_start(args, fmt);
+    /* must use vprintf to print */
+    rt_vsprintf(log_buf, fmt, args);
+    rt_kprintf("%s\n", log_buf);
+    va_end(args);
+}
+
+static void mg(uint8_t argc, char **argv) {
+
+enum {
+    CMD_HTTP_INDEX,
+};
+
+    size_t i = 0;
+    static struct mg_mgr *mgr = NULL;
+    static rt_thread_t test_thread = NULL;
+    static struct mg_connection *conn = NULL;
+
+    const char* help_info[] = {
+            [CMD_HTTP_INDEX]    = "mg http <s:server|c:client <url>>       - start http `server` or http `client url` test",
+    };
+
+    if (argc < 2) {
+        rt_kprintf("Usage:\n");
+        for (i = 0; i < sizeof(help_info) / sizeof(char*); i++) {
+            rt_kprintf("%s\n", help_info[i]);
+        }
+        rt_kprintf("\n");
+    } else {
+        const char *operator = argv[1];
+
+        if (!strcmp(operator, "init")) {
+        } else {
+            /* create locker when first running */
+            if (!mg_locker) {
+                mg_locker = rt_mutex_create("mg_lock", RT_IPC_FLAG_FIFO);
+            }
+            /* delete last mongoose manager poll thread */
+            if (test_thread) {
+                rt_thread_delete(test_thread);
+                /* wait 100 ticks for thread deleted finish */
+                rt_thread_delay(100);
+                test_thread = NULL;
+            }
+
+            /* create and initialize mongoose manager */
+            {
+                /* delete last mongoose manager */
+                if (mgr) {
+                    mg_mgr_free(mgr);
+                    rt_free(mgr);
+                    mgr = NULL;
+                }
+                mgr = rt_calloc(sizeof(struct mg_mgr), 1);
+                if (mgr) {
+                    mg_mgr_init(mgr, NULL);
+                } else {
+                    rt_kprintf("Warning: NO memory.\n");
+                    return;
+                }
+            }
+
+            if (!strcmp(operator, "http")) {
+                if (argc < 3) {
+                    rt_kprintf("Usage: %s.\n", help_info[CMD_HTTP_INDEX]);
+                    return;
+                } else if (!strcmp(argv[2], "s")) {
+                    /* http server test */
+                    const char *err;
+                    struct mg_bind_opts opts = { NULL };
+
+                    opts.error_string = &err;
+                    conn = mg_bind_opt(mgr, ":80", http_server_ev_handler, opts);
+                    if (conn == NULL) {
+                        rt_kprintf("Failed to create listener: %s\r\n", err);
+                        return;
+                    }
+                    mg_set_protocol_http_websocket(conn);
+                    rt_kprintf("Server address: http://%s:%d/\r\n", inet_ntoa(conn->sa.sin.sin_addr), htons(conn->sa.sin.sin_port));
+                } else if (!strcmp(argv[2], "c") && argc > 3) {
+                    /* http client test */
+                    mg_connect_http(mgr, http_client_ev_handler, argv[3], NULL, NULL);
+                    rt_kprintf("Http client request url: %s\n", argv[3]);
+                } else {
+                    rt_kprintf("Usage: %s.\n", help_info[CMD_HTTP_INDEX]);
+                    return;
+                }
+            } else if (!strcmp(operator, "ws")) {
+            } else if (!strcmp(operator, "coap")) {
+            } else if (!strcmp(operator, "mqtt")) {
+            } else {
+                rt_kprintf("Usage:\n");
+                for (i = 0; i < sizeof(help_info) / sizeof(char*); i++) {
+                    rt_kprintf("%s\n", help_info[i]);
+                }
+                rt_kprintf("\n");
+            }
+
+            test_thread = rt_thread_create("mg_test_poll", thread_entry_mg_poll, mgr, 2048, 8, 10);
+            if (test_thread != NULL) {
+                rt_thread_startup(test_thread);
+            } else {
+                rt_kprintf("Warning: NO memory.\n");
+            }
+        }
+    }
+}
+MSH_CMD_EXPORT(mg, Mongoose Test);

mongoose.c

@@ -0,0 +1,15166 @@
+#include "mongoose.h"
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/internal.h"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_MONGOOSE_SRC_INTERNAL_H_
+#define CS_MONGOOSE_SRC_INTERNAL_H_
+
+#ifndef MG_MALLOC
+#define MG_MALLOC malloc
+#endif
+
+#ifndef MG_CALLOC
+#define MG_CALLOC calloc
+#endif
+
+#ifndef MG_REALLOC
+#define MG_REALLOC realloc
+#endif
+
+#ifndef MG_FREE
+#define MG_FREE free
+#endif
+
+#ifndef MBUF_REALLOC
+#define MBUF_REALLOC MG_REALLOC
+#endif
+
+#ifndef MBUF_FREE
+#define MBUF_FREE MG_FREE
+#endif
+
+#ifndef MG_STRDUP
+#define MG_STRDUP strdup
+#endif
+
+#define MG_SET_PTRPTR(_ptr, _v) \
+  do {                          \
+    if (_ptr) *(_ptr) = _v;     \
+  } while (0)
+
+#ifndef MG_INTERNAL
+#define MG_INTERNAL static
+#endif
+
+#ifdef PICOTCP
+#define NO_LIBC
+#define MG_DISABLE_PFS
+#endif
+
+/* Amalgamated: #include "mongoose/src/net.h" */
+/* Amalgamated: #include "mongoose/src/http.h" */
+/* Amalgamated: #include "common/cs_dbg.h" */
+
+#define MG_CTL_MSG_MESSAGE_SIZE 8192
+
+/* internals that need to be accessible in unit tests */
+MG_INTERNAL struct mg_connection *mg_do_connect(struct mg_connection *nc,
+                                                int proto,
+                                                union socket_address *sa);
+
+MG_INTERNAL int mg_parse_address(const char *str, union socket_address *sa,
+                                 int *proto, char *host, size_t host_len);
+MG_INTERNAL void mg_call(struct mg_connection *nc,
+                         mg_event_handler_t ev_handler, int ev, void *ev_data);
+void mg_forward(struct mg_connection *from, struct mg_connection *to);
+MG_INTERNAL void mg_add_conn(struct mg_mgr *mgr, struct mg_connection *c);
+MG_INTERNAL void mg_remove_conn(struct mg_connection *c);
+MG_INTERNAL struct mg_connection *mg_create_connection(
+    struct mg_mgr *mgr, mg_event_handler_t callback,
+    struct mg_add_sock_opts opts);
+#ifdef _WIN32
+/* Retur value is the same as for MultiByteToWideChar. */
+int to_wchar(const char *path, wchar_t *wbuf, size_t wbuf_len);
+#endif
+
+struct ctl_msg {
+  mg_event_handler_t callback;
+  char message[MG_CTL_MSG_MESSAGE_SIZE];
+};
+
+#if MG_ENABLE_MQTT
+struct mg_mqtt_message;
+MG_INTERNAL int parse_mqtt(struct mbuf *io, struct mg_mqtt_message *mm);
+#endif
+
+/* Forward declarations for testing. */
+extern void *(*test_malloc)(size_t size);
+extern void *(*test_calloc)(size_t count, size_t size);
+
+#ifndef MIN
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#endif
+
+#if MG_ENABLE_HTTP
+struct mg_serve_http_opts;
+
+/*
+ * Reassemble the content of the buffer (buf, blen) which should be
+ * in the HTTP chunked encoding, by collapsing data chunks to the
+ * beginning of the buffer.
+ *
+ * If chunks get reassembled, modify hm->body to point to the reassembled
+ * body and fire MG_EV_HTTP_CHUNK event. If handler sets MG_F_DELETE_CHUNK
+ * in nc->flags, delete reassembled body from the mbuf.
+ *
+ * Return reassembled body size.
+ */
+MG_INTERNAL size_t mg_handle_chunked(struct mg_connection *nc,
+                                     struct http_message *hm, char *buf,
+                                     size_t blen);
+
+MG_INTERNAL int mg_http_common_url_parse(const char *url, const char *schema,
+                                         const char *schema_tls, int *use_ssl,
+                                         char **user, char **pass, char **addr,
+                                         int *port_i, const char **path);
+
+#if MG_ENABLE_FILESYSTEM
+MG_INTERNAL int mg_uri_to_local_path(struct http_message *hm,
+                                     const struct mg_serve_http_opts *opts,
+                                     char **local_path,
+                                     struct mg_str *remainder);
+MG_INTERNAL time_t mg_parse_date_string(const char *datetime);
+MG_INTERNAL int mg_is_not_modified(struct http_message *hm, cs_stat_t *st);
+#endif
+#if MG_ENABLE_HTTP_CGI
+MG_INTERNAL void mg_handle_cgi(struct mg_connection *nc, const char *prog,
+                               const struct mg_str *path_info,
+                               const struct http_message *hm,
+                               const struct mg_serve_http_opts *opts);
+struct mg_http_proto_data_cgi;
+MG_INTERNAL void mg_http_free_proto_data_cgi(struct mg_http_proto_data_cgi *d);
+#endif
+#if MG_ENABLE_HTTP_SSI
+MG_INTERNAL void mg_handle_ssi_request(struct mg_connection *nc,
+                                       struct http_message *hm,
+                                       const char *path,
+                                       const struct mg_serve_http_opts *opts);
+#endif
+#if MG_ENABLE_HTTP_WEBDAV
+MG_INTERNAL int mg_is_dav_request(const struct mg_str *s);
+MG_INTERNAL void mg_handle_propfind(struct mg_connection *nc, const char *path,
+                                    cs_stat_t *stp, struct http_message *hm,
+                                    struct mg_serve_http_opts *opts);
+MG_INTERNAL void mg_handle_lock(struct mg_connection *nc, const char *path);
+MG_INTERNAL void mg_handle_mkcol(struct mg_connection *nc, const char *path,
+                                 struct http_message *hm);
+MG_INTERNAL void mg_handle_move(struct mg_connection *c,
+                                const struct mg_serve_http_opts *opts,
+                                const char *path, struct http_message *hm);
+MG_INTERNAL void mg_handle_delete(struct mg_connection *nc,
+                                  const struct mg_serve_http_opts *opts,
+                                  const char *path);
+MG_INTERNAL void mg_handle_put(struct mg_connection *nc, const char *path,
+                               struct http_message *hm);
+#endif
+#if MG_ENABLE_HTTP_WEBSOCKET
+MG_INTERNAL void mg_ws_handler(struct mg_connection *nc, int ev, void *ev_data);
+MG_INTERNAL void mg_ws_handshake(struct mg_connection *nc,
+                                 const struct mg_str *key);
+#endif
+#endif /* MG_ENABLE_HTTP */
+
+MG_INTERNAL int mg_get_errno(void);
+
+MG_INTERNAL void mg_close_conn(struct mg_connection *conn);
+
+MG_INTERNAL int mg_http_common_url_parse(const char *url, const char *schema,
+                                         const char *schema_tls, int *use_ssl,
+                                         char **user, char **pass, char **addr,
+                                         int *port_i, const char **path);
+
+#if MG_ENABLE_SNTP
+MG_INTERNAL int mg_sntp_parse_reply(const char *buf, int len,
+                                    struct mg_sntp_message *msg);
+#endif
+
+#endif /* CS_MONGOOSE_SRC_INTERNAL_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/cs_dbg.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_CS_DBG_H_
+#define CS_COMMON_CS_DBG_H_
+
+/* Amalgamated: #include "common/platform.h" */
+
+#if CS_ENABLE_STDIO
+#include <stdio.h>
+#endif
+
+#ifndef CS_ENABLE_DEBUG
+#define CS_ENABLE_DEBUG 0
+#endif
+
+#ifndef CS_LOG_ENABLE_TS_DIFF
+#define CS_LOG_ENABLE_TS_DIFF 0
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+enum cs_log_level {
+  LL_NONE = -1,
+  LL_ERROR = 0,
+  LL_WARN = 1,
+  LL_INFO = 2,
+  LL_DEBUG = 3,
+  LL_VERBOSE_DEBUG = 4,
+
+  _LL_MIN = -2,
+  _LL_MAX = 5,
+};
+
+void cs_log_set_level(enum cs_log_level level);
+
+#if CS_ENABLE_STDIO
+
+void cs_log_set_file(FILE *file);
+extern enum cs_log_level cs_log_level;
+void cs_log_print_prefix(const char *func);
+void cs_log_printf(const char *fmt, ...);
+
+#define LOG(l, x)                    \
+  do {                               \
+    if (cs_log_level >= l) {         \
+      cs_log_print_prefix(__func__); \
+      cs_log_printf x;               \
+    }                                \
+  } while (0)
+
+#ifndef CS_NDEBUG
+
+#define DBG(x)                              \
+  do {                                      \
+    if (cs_log_level >= LL_VERBOSE_DEBUG) { \
+      cs_log_print_prefix(__func__);        \
+      cs_log_printf x;                      \
+    }                                       \
+  } while (0)
+
+#else /* NDEBUG */
+
+#define DBG(x)
+
+#endif
+
+#else /* CS_ENABLE_STDIO */
+
+#define LOG(l, x)
+#define DBG(x)
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* CS_COMMON_CS_DBG_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/cs_dbg.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/* Amalgamated: #include "common/cs_dbg.h" */
+
+#include <stdarg.h>
+#include <stdio.h>
+
+/* Amalgamated: #include "common/cs_time.h" */
+
+WEAK enum cs_log_level cs_log_level =
+#if CS_ENABLE_DEBUG
+    LL_VERBOSE_DEBUG;
+#else
+    LL_ERROR;
+#endif
+
+#if CS_ENABLE_STDIO
+
+WEAK FILE *cs_log_file = NULL;
+
+#if CS_LOG_ENABLE_TS_DIFF
+WEAK double cs_log_ts;
+#endif
+
+WEAK void cs_log_print_prefix(const char *func) {
+  char prefix[21];
+  strncpy(prefix, func, 20);
+  prefix[20] = '\0';
+  if (cs_log_file == NULL) cs_log_file = stderr;
+  fprintf(cs_log_file, "%-20s ", prefix);
+#if CS_LOG_ENABLE_TS_DIFF
+  {
+    double now = cs_time();
+    fprintf(cs_log_file, "%7u ", (unsigned int) ((now - cs_log_ts) * 1000000));
+    cs_log_ts = now;
+  }
+#endif
+}
+
+WEAK void cs_log_printf(const char *fmt, ...) {
+  va_list ap;
+  va_start(ap, fmt);
+  vfprintf(cs_log_file, fmt, ap);
+  va_end(ap);
+  fputc('\n', cs_log_file);
+  fflush(cs_log_file);
+}
+
+WEAK void cs_log_set_file(FILE *file) {
+  cs_log_file = file;
+}
+
+#endif /* CS_ENABLE_STDIO */
+
+WEAK void cs_log_set_level(enum cs_log_level level) {
+  cs_log_level = level;
+#if CS_LOG_ENABLE_TS_DIFF && CS_ENABLE_STDIO
+  cs_log_ts = cs_time();
+#endif
+}
+#ifdef MG_MODULE_LINES
+#line 1 "common/base64.c"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef EXCLUDE_COMMON
+
+/* Amalgamated: #include "common/base64.h" */
+
+#include <string.h>
+
+/* Amalgamated: #include "common/cs_dbg.h" */
+
+/* ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/ */
+
+#define NUM_UPPERCASES ('Z' - 'A' + 1)
+#define NUM_LETTERS (NUM_UPPERCASES * 2)
+#define NUM_DIGITS ('9' - '0' + 1)
+
+/*
+ * Emit a base64 code char.
+ *
+ * Doesn't use memory, thus it's safe to use to safely dump memory in crashdumps
+ */
+static void cs_base64_emit_code(struct cs_base64_ctx *ctx, int v) {
+  if (v < NUM_UPPERCASES) {
+    ctx->b64_putc(v + 'A', ctx->user_data);
+  } else if (v < (NUM_LETTERS)) {
+    ctx->b64_putc(v - NUM_UPPERCASES + 'a', ctx->user_data);
+  } else if (v < (NUM_LETTERS + NUM_DIGITS)) {
+    ctx->b64_putc(v - NUM_LETTERS + '0', ctx->user_data);
+  } else {
+    ctx->b64_putc(v - NUM_LETTERS - NUM_DIGITS == 0 ? '+' : '/',
+                  ctx->user_data);
+  }
+}
+
+static void cs_base64_emit_chunk(struct cs_base64_ctx *ctx) {
+  int a, b, c;
+
+  a = ctx->chunk[0];
+  b = ctx->chunk[1];
+  c = ctx->chunk[2];
+
+  cs_base64_emit_code(ctx, a >> 2);
+  cs_base64_emit_code(ctx, ((a & 3) << 4) | (b >> 4));
+  if (ctx->chunk_size > 1) {
+    cs_base64_emit_code(ctx, (b & 15) << 2 | (c >> 6));
+  }
+  if (ctx->chunk_size > 2) {
+    cs_base64_emit_code(ctx, c & 63);
+  }
+}
+
+void cs_base64_init(struct cs_base64_ctx *ctx, cs_base64_putc_t b64_putc,
+                    void *user_data) {
+  ctx->chunk_size = 0;
+  ctx->b64_putc = b64_putc;
+  ctx->user_data = user_data;
+}
+
+void cs_base64_update(struct cs_base64_ctx *ctx, const char *str, size_t len) {
+  const unsigned char *src = (const unsigned char *) str;
+  size_t i;
+  for (i = 0; i < len; i++) {
+    ctx->chunk[ctx->chunk_size++] = src[i];
+    if (ctx->chunk_size == 3) {
+      cs_base64_emit_chunk(ctx);
+      ctx->chunk_size = 0;
+    }
+  }
+}
+
+void cs_base64_finish(struct cs_base64_ctx *ctx) {
+  if (ctx->chunk_size > 0) {
+    int i;
+    memset(&ctx->chunk[ctx->chunk_size], 0, 3 - ctx->chunk_size);
+    cs_base64_emit_chunk(ctx);
+    for (i = 0; i < (3 - ctx->chunk_size); i++) {
+      ctx->b64_putc('=', ctx->user_data);
+    }
+  }
+}
+
+#define BASE64_ENCODE_BODY                                                \
+  static const char *b64 =                                                \
+      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; \
+  int i, j, a, b, c;                                                      \
+                                                                          \
+  for (i = j = 0; i < src_len; i += 3) {                                  \
+    a = src[i];                                                           \
+    b = i + 1 >= src_len ? 0 : src[i + 1];                                \
+    c = i + 2 >= src_len ? 0 : src[i + 2];                                \
+                                                                          \
+    BASE64_OUT(b64[a >> 2]);                                              \
+    BASE64_OUT(b64[((a & 3) << 4) | (b >> 4)]);                           \
+    if (i + 1 < src_len) {                                                \
+      BASE64_OUT(b64[(b & 15) << 2 | (c >> 6)]);                          \
+    }                                                                     \
+    if (i + 2 < src_len) {                                                \
+      BASE64_OUT(b64[c & 63]);                                            \
+    }                                                                     \
+  }                                                                       \
+                                                                          \
+  while (j % 4 != 0) {                                                    \
+    BASE64_OUT('=');                                                      \
+  }                                                                       \
+  BASE64_FLUSH()
+
+#define BASE64_OUT(ch) \
+  do {                 \
+    dst[j++] = (ch);   \
+  } while (0)
+
+#define BASE64_FLUSH() \
+  do {                 \
+    dst[j++] = '\0';   \
+  } while (0)
+
+void cs_base64_encode(const unsigned char *src, int src_len, char *dst) {
+  BASE64_ENCODE_BODY;
+}
+
+#undef BASE64_OUT
+#undef BASE64_FLUSH
+
+#if CS_ENABLE_STDIO
+#define BASE64_OUT(ch)      \
+  do {                      \
+    fprintf(f, "%c", (ch)); \
+    j++;                    \
+  } while (0)
+
+#define BASE64_FLUSH()
+
+void cs_fprint_base64(FILE *f, const unsigned char *src, int src_len) {
+  BASE64_ENCODE_BODY;
+}
+
+#undef BASE64_OUT
+#undef BASE64_FLUSH
+#endif /* CS_ENABLE_STDIO */
+
+/* Convert one byte of encoded base64 input stream to 6-bit chunk */
+static unsigned char from_b64(unsigned char ch) {
+  /* Inverse lookup map */
+  static const unsigned char tab[128] = {
+      255, 255, 255, 255,
+      255, 255, 255, 255, /*  0 */
+      255, 255, 255, 255,
+      255, 255, 255, 255, /*  8 */
+      255, 255, 255, 255,
+      255, 255, 255, 255, /*  16 */
+      255, 255, 255, 255,
+      255, 255, 255, 255, /*  24 */
+      255, 255, 255, 255,
+      255, 255, 255, 255, /*  32 */
+      255, 255, 255, 62,
+      255, 255, 255, 63, /*  40 */
+      52,  53,  54,  55,
+      56,  57,  58,  59, /*  48 */
+      60,  61,  255, 255,
+      255, 200, 255, 255, /*  56   '=' is 200, on index 61 */
+      255, 0,   1,   2,
+      3,   4,   5,   6, /*  64 */
+      7,   8,   9,   10,
+      11,  12,  13,  14, /*  72 */
+      15,  16,  17,  18,
+      19,  20,  21,  22, /*  80 */
+      23,  24,  25,  255,
+      255, 255, 255, 255, /*  88 */
+      255, 26,  27,  28,
+      29,  30,  31,  32, /*  96 */
+      33,  34,  35,  36,
+      37,  38,  39,  40, /*  104 */
+      41,  42,  43,  44,
+      45,  46,  47,  48, /*  112 */
+      49,  50,  51,  255,
+      255, 255, 255, 255, /*  120 */
+  };
+  return tab[ch & 127];
+}
+
+int cs_base64_decode(const unsigned char *s, int len, char *dst, int *dec_len) {
+  unsigned char a, b, c, d;
+  int orig_len = len;
+  char *orig_dst = dst;
+  while (len >= 4 && (a = from_b64(s[0])) != 255 &&
+         (b = from_b64(s[1])) != 255 && (c = from_b64(s[2])) != 255 &&
+         (d = from_b64(s[3])) != 255) {
+    s += 4;
+    len -= 4;
+    if (a == 200 || b == 200) break; /* '=' can't be there */
+    *dst++ = a << 2 | b >> 4;
+    if (c == 200) break;
+    *dst++ = b << 4 | c >> 2;
+    if (d == 200) break;
+    *dst++ = c << 6 | d;
+  }
+  *dst = 0;
+  if (dec_len != NULL) *dec_len = (dst - orig_dst);
+  return orig_len - len;
+}
+
+#endif /* EXCLUDE_COMMON */
+#ifdef MG_MODULE_LINES
+#line 1 "common/cs_dirent.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_CS_DIRENT_H_
+#define CS_COMMON_CS_DIRENT_H_
+
+#include <limits.h>
+
+/* Amalgamated: #include "common/platform.h" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#if CS_DEFINE_DIRENT
+typedef struct { int dummy; } DIR;
+
+struct dirent {
+  int d_ino;
+#ifdef _WIN32
+  char d_name[MAX_PATH];
+#else
+  /* TODO(rojer): Use PATH_MAX but make sure it's sane on every platform */
+  char d_name[256];
+#endif
+};
+
+DIR *opendir(const char *dir_name);
+int closedir(DIR *dir);
+struct dirent *readdir(DIR *dir);
+#endif /* CS_DEFINE_DIRENT */
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* CS_COMMON_CS_DIRENT_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/cs_dirent.c"
+#endif
+/*
+ * Copyright (c) 2015 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef EXCLUDE_COMMON
+
+/* Amalgamated: #include "common/cs_dirent.h" */
+
+/*
+ * This file contains POSIX opendir/closedir/readdir API implementation
+ * for systems which do not natively support it (e.g. Windows).
+ */
+
+#ifndef MG_FREE
+#define MG_FREE free
+#endif
+
+#ifndef MG_MALLOC
+#define MG_MALLOC malloc
+#endif
+
+#ifdef _WIN32
+struct win32_dir {
+  DIR d;
+  HANDLE handle;
+  WIN32_FIND_DATAW info;
+  struct dirent result;
+};
+
+DIR *opendir(const char *name) {
+  struct win32_dir *dir = NULL;
+  wchar_t wpath[MAX_PATH];
+  DWORD attrs;
+
+  if (name == NULL) {
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  } else if ((dir = (struct win32_dir *) MG_MALLOC(sizeof(*dir))) == NULL) {
+    SetLastError(ERROR_NOT_ENOUGH_MEMORY);
+  } else {
+    to_wchar(name, wpath, ARRAY_SIZE(wpath));
+    attrs = GetFileAttributesW(wpath);
+    if (attrs != 0xFFFFFFFF && (attrs & FILE_ATTRIBUTE_DIRECTORY)) {
+      (void) wcscat(wpath, L"\\*");
+      dir->handle = FindFirstFileW(wpath, &dir->info);
+      dir->result.d_name[0] = '\0';
+    } else {
+      MG_FREE(dir);
+      dir = NULL;
+    }
+  }
+
+  return (DIR *) dir;
+}
+
+int closedir(DIR *d) {
+  struct win32_dir *dir = (struct win32_dir *) d;
+  int result = 0;
+
+  if (dir != NULL) {
+    if (dir->handle != INVALID_HANDLE_VALUE)
+      result = FindClose(dir->handle) ? 0 : -1;
+    MG_FREE(dir);
+  } else {
+    result = -1;
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  }
+
+  return result;
+}
+
+struct dirent *readdir(DIR *d) {
+  struct win32_dir *dir = (struct win32_dir *) d;
+  struct dirent *result = NULL;
+
+  if (dir) {
+    memset(&dir->result, 0, sizeof(dir->result));
+    if (dir->handle != INVALID_HANDLE_VALUE) {
+      result = &dir->result;
+      (void) WideCharToMultiByte(CP_UTF8, 0, dir->info.cFileName, -1,
+                                 result->d_name, sizeof(result->d_name), NULL,
+                                 NULL);
+
+      if (!FindNextFileW(dir->handle, &dir->info)) {
+        (void) FindClose(dir->handle);
+        dir->handle = INVALID_HANDLE_VALUE;
+      }
+
+    } else {
+      SetLastError(ERROR_FILE_NOT_FOUND);
+    }
+  } else {
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  }
+
+  return result;
+}
+#endif
+
+#endif /* EXCLUDE_COMMON */
+
+/* ISO C requires a translation unit to contain at least one declaration */
+typedef int cs_dirent_dummy;
+#ifdef MG_MODULE_LINES
+#line 1 "common/cs_time.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/* Amalgamated: #include "common/cs_time.h" */
+
+#ifndef _WIN32
+#include <stddef.h>
+/*
+ * There is no sys/time.h on ARMCC.
+ */
+#if !(defined(__ARMCC_VERSION) || defined(__ICCARM__)) && \
+    !defined(__TI_COMPILER_VERSION__) &&                  \
+    (!defined(CS_PLATFORM) || CS_PLATFORM != CS_P_NXP_LPC)
+#include <sys/time.h>
+#endif
+#else
+#include <windows.h>
+#endif
+
+WEAK double cs_time(void) {
+  double now;
+#ifndef _WIN32
+  struct timeval tv;
+  if (gettimeofday(&tv, NULL /* tz */) != 0) return 0;
+  now = (double) tv.tv_sec + (((double) tv.tv_usec) / 1000000.0);
+#else
+  SYSTEMTIME sysnow;
+  FILETIME ftime;
+  GetLocalTime(&sysnow);
+  SystemTimeToFileTime(&sysnow, &ftime);
+  /*
+   * 1. VC 6.0 doesn't support conversion uint64 -> double, so, using int64
+   * This should not cause a problems in this (21th) century
+   * 2. Windows FILETIME is a number of 100-nanosecond intervals since January
+   * 1, 1601 while time_t is a number of _seconds_ since January 1, 1970 UTC,
+   * thus, we need to convert to seconds and adjust amount (subtract 11644473600
+   * seconds)
+   */
+  now = (double) (((int64_t) ftime.dwLowDateTime +
+                   ((int64_t) ftime.dwHighDateTime << 32)) /
+                  10000000.0) -
+        11644473600;
+#endif /* _WIN32 */
+  return now;
+}
+#ifdef MG_MODULE_LINES
+#line 1 "common/cs_endian.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_CS_ENDIAN_H_
+#define CS_COMMON_CS_ENDIAN_H_
+
+/*
+ * clang with std=-c99 uses __LITTLE_ENDIAN, by default
+ * while for ex, RTOS gcc - LITTLE_ENDIAN, by default
+ * it depends on __USE_BSD, but let's have everything
+ */
+#if !defined(BYTE_ORDER) && defined(__BYTE_ORDER)
+#define BYTE_ORDER __BYTE_ORDER
+#ifndef LITTLE_ENDIAN
+#define LITTLE_ENDIAN __LITTLE_ENDIAN
+#endif /* LITTLE_ENDIAN */
+#ifndef BIG_ENDIAN
+#define BIG_ENDIAN __LITTLE_ENDIAN
+#endif /* BIG_ENDIAN */
+#endif /* BYTE_ORDER */
+
+#endif /* CS_COMMON_CS_ENDIAN_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/md5.c"
+#endif
+/*
+ * This code implements the MD5 message-digest algorithm.
+ * The algorithm is due to Ron Rivest.  This code was
+ * written by Colin Plumb in 1993, no copyright is claimed.
+ * This code is in the public domain; do with it what you wish.
+ *
+ * Equivalent code is available from RSA Data Security, Inc.
+ * This code has been tested against that, and is equivalent,
+ * except that you don't need to include two pages of legalese
+ * with every copy.
+ *
+ * To compute the message digest of a chunk of bytes, declare an
+ * MD5Context structure, pass it to MD5Init, call MD5Update as
+ * needed on buffers full of bytes, and then call MD5Final, which
+ * will fill a supplied 16-byte array with the digest.
+ */
+
+/* Amalgamated: #include "common/md5.h" */
+/* Amalgamated: #include "common/str_util.h" */
+
+#if !defined(EXCLUDE_COMMON)
+#if !DISABLE_MD5
+
+/* Amalgamated: #include "common/cs_endian.h" */
+
+static void byteReverse(unsigned char *buf, unsigned longs) {
+/* Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN */
+#if BYTE_ORDER == BIG_ENDIAN
+  do {
+    uint32_t t = (uint32_t)((unsigned) buf[3] << 8 | buf[2]) << 16 |
+                 ((unsigned) buf[1] << 8 | buf[0]);
+    *(uint32_t *) buf = t;
+    buf += 4;
+  } while (--longs);
+#else
+  (void) buf;
+  (void) longs;
+#endif
+}
+
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+#define MD5STEP(f, w, x, y, z, data, s) \
+  (w += f(x, y, z) + data, w = w << s | w >> (32 - s), w += x)
+
+/*
+ * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
+ * initialization constants.
+ */
+void MD5_Init(MD5_CTX *ctx) {
+  ctx->buf[0] = 0x67452301;
+  ctx->buf[1] = 0xefcdab89;
+  ctx->buf[2] = 0x98badcfe;
+  ctx->buf[3] = 0x10325476;
+
+  ctx->bits[0] = 0;
+  ctx->bits[1] = 0;
+}
+
+static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
+  register uint32_t a, b, c, d;
+
+  a = buf[0];
+  b = buf[1];
+  c = buf[2];
+  d = buf[3];
+
+  MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+  MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+  MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+  MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+  MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+  MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+  MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+  MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+  MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+  MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+  MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+  MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+  MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+  MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+  MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+  MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+
+  MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+  MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+  MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+  MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+  MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+  MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+  MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+  MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+  MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+  MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+  MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+  MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+  MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+  MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+  MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+  MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+
+  MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+  MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+  MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+  MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+  MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+  MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+  MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+  MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+  MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+  MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+  MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+  MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+  MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+  MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+  MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+  MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+
+  MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+  MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+  MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+  MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+  MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+  MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+  MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+  MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+  MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+  MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+  MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+  MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+  MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+  MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+  MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+  MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+
+  buf[0] += a;
+  buf[1] += b;
+  buf[2] += c;
+  buf[3] += d;
+}
+
+void MD5_Update(MD5_CTX *ctx, const unsigned char *buf, size_t len) {
+  uint32_t t;
+
+  t = ctx->bits[0];
+  if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t) ctx->bits[1]++;
+  ctx->bits[1] += (uint32_t) len >> 29;
+
+  t = (t >> 3) & 0x3f;
+
+  if (t) {
+    unsigned char *p = (unsigned char *) ctx->in + t;
+
+    t = 64 - t;
+    if (len < t) {
+      memcpy(p, buf, len);
+      return;
+    }
+    memcpy(p, buf, t);
+    byteReverse(ctx->in, 16);
+    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+    buf += t;
+    len -= t;
+  }
+
+  while (len >= 64) {
+    memcpy(ctx->in, buf, 64);
+    byteReverse(ctx->in, 16);
+    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+    buf += 64;
+    len -= 64;
+  }
+
+  memcpy(ctx->in, buf, len);
+}
+
+void MD5_Final(unsigned char digest[16], MD5_CTX *ctx) {
+  unsigned count;
+  unsigned char *p;
+  uint32_t *a;
+
+  count = (ctx->bits[0] >> 3) & 0x3F;
+
+  p = ctx->in + count;
+  *p++ = 0x80;
+  count = 64 - 1 - count;
+  if (count < 8) {
+    memset(p, 0, count);
+    byteReverse(ctx->in, 16);
+    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+    memset(ctx->in, 0, 56);
+  } else {
+    memset(p, 0, count - 8);
+  }
+  byteReverse(ctx->in, 14);
+
+  a = (uint32_t *) ctx->in;
+  a[14] = ctx->bits[0];
+  a[15] = ctx->bits[1];
+
+  MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+  byteReverse((unsigned char *) ctx->buf, 4);
+  memcpy(digest, ctx->buf, 16);
+  memset((char *) ctx, 0, sizeof(*ctx));
+}
+#endif /* DISABLE_MD5 */
+
+char *cs_md5(char buf[33], ...) {
+  unsigned char hash[16];
+  const unsigned char *p;
+  va_list ap;
+  MD5_CTX ctx;
+
+  MD5_Init(&ctx);
+
+  va_start(ap, buf);
+  while ((p = va_arg(ap, const unsigned char *) ) != NULL) {
+    size_t len = va_arg(ap, size_t);
+    MD5_Update(&ctx, p, len);
+  }
+  va_end(ap);
+
+  MD5_Final(hash, &ctx);
+  cs_to_hex(buf, hash, sizeof(hash));
+
+  return buf;
+}
+
+#endif /* EXCLUDE_COMMON */
+#ifdef MG_MODULE_LINES
+#line 1 "common/mbuf.c"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef EXCLUDE_COMMON
+
+#include <assert.h>
+#include <string.h>
+/* Amalgamated: #include "common/mbuf.h" */
+
+#ifndef MBUF_REALLOC
+#define MBUF_REALLOC realloc
+#endif
+
+#ifndef MBUF_FREE
+#define MBUF_FREE free
+#endif
+
+WEAK void mbuf_init(struct mbuf *mbuf, size_t initial_size) {
+  mbuf->len = mbuf->size = 0;
+  mbuf->buf = NULL;
+  mbuf_resize(mbuf, initial_size);
+}
+
+WEAK void mbuf_free(struct mbuf *mbuf) {
+  if (mbuf->buf != NULL) {
+    MBUF_FREE(mbuf->buf);
+    mbuf_init(mbuf, 0);
+  }
+}
+
+WEAK void mbuf_resize(struct mbuf *a, size_t new_size) {
+  if (new_size > a->size || (new_size < a->size && new_size >= a->len)) {
+    char *buf = (char *) MBUF_REALLOC(a->buf, new_size);
+    /*
+     * In case realloc fails, there's not much we can do, except keep things as
+     * they are. Note that NULL is a valid return value from realloc when
+     * size == 0, but that is covered too.
+     */
+    if (buf == NULL && new_size != 0) return;
+    a->buf = buf;
+    a->size = new_size;
+  }
+}
+
+WEAK void mbuf_trim(struct mbuf *mbuf) {
+  mbuf_resize(mbuf, mbuf->len);
+}
+
+WEAK size_t mbuf_insert(struct mbuf *a, size_t off, const void *buf, size_t len) {
+  char *p = NULL;
+
+  assert(a != NULL);
+  assert(a->len <= a->size);
+  assert(off <= a->len);
+
+  /* check overflow */
+  if (~(size_t) 0 - (size_t) a->buf < len) return 0;
+
+  if (a->len + len <= a->size) {
+    memmove(a->buf + off + len, a->buf + off, a->len - off);
+    if (buf != NULL) {
+      memcpy(a->buf + off, buf, len);
+    }
+    a->len += len;
+  } else {
+    size_t new_size = (size_t)((a->len + len) * MBUF_SIZE_MULTIPLIER);
+    if ((p = (char *) MBUF_REALLOC(a->buf, new_size)) != NULL) {
+      a->buf = p;
+      memmove(a->buf + off + len, a->buf + off, a->len - off);
+      if (buf != NULL) memcpy(a->buf + off, buf, len);
+      a->len += len;
+      a->size = new_size;
+    } else {
+      len = 0;
+    }
+  }
+
+  return len;
+}
+
+WEAK size_t mbuf_append(struct mbuf *a, const void *buf, size_t len) {
+  return mbuf_insert(a, a->len, buf, len);
+}
+
+WEAK void mbuf_remove(struct mbuf *mb, size_t n) {
+  if (n > 0 && n <= mb->len) {
+    memmove(mb->buf, mb->buf + n, mb->len - n);
+    mb->len -= n;
+  }
+}
+
+#endif /* EXCLUDE_COMMON */
+#ifdef MG_MODULE_LINES
+#line 1 "common/mg_str.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/* Amalgamated: #include "common/mg_str.h" */
+
+#include <stdlib.h>
+#include <string.h>
+
+WEAK int mg_ncasecmp(const char *s1, const char *s2, size_t len);
+
+WEAK struct mg_str mg_mk_str(const char *s) {
+  struct mg_str ret = {s, 0};
+  if (s != NULL) ret.len = strlen(s);
+  return ret;
+}
+
+WEAK struct mg_str mg_mk_str_n(const char *s, size_t len) {
+  struct mg_str ret = {s, len};
+  return ret;
+}
+
+WEAK int mg_vcmp(const struct mg_str *str1, const char *str2) {
+  size_t n2 = strlen(str2), n1 = str1->len;
+  int r = memcmp(str1->p, str2, (n1 < n2) ? n1 : n2);
+  if (r == 0) {
+    return n1 - n2;
+  }
+  return r;
+}
+
+WEAK int mg_vcasecmp(const struct mg_str *str1, const char *str2) {
+  size_t n2 = strlen(str2), n1 = str1->len;
+  int r = mg_ncasecmp(str1->p, str2, (n1 < n2) ? n1 : n2);
+  if (r == 0) {
+    return n1 - n2;
+  }
+  return r;
+}
+
+WEAK struct mg_str mg_strdup(const struct mg_str s) {
+  struct mg_str r = {NULL, 0};
+  if (s.len > 0 && s.p != NULL) {
+    r.p = (char *) MG_MALLOC(s.len);
+    if (r.p != NULL) {
+      memcpy((char *) r.p, s.p, s.len);
+      r.len = s.len;
+    }
+  }
+  return r;
+}
+
+WEAK int mg_strcmp(const struct mg_str str1, const struct mg_str str2) {
+  size_t i = 0;
+  while (i < str1.len && i < str2.len) {
+    if (str1.p[i] < str2.p[i]) return -1;
+    if (str1.p[i] > str2.p[i]) return 1;
+    i++;
+  }
+  if (i < str1.len) return 1;
+  if (i < str2.len) return -1;
+  return 0;
+}
+
+WEAK int mg_strncmp(const struct mg_str str1, const struct mg_str str2, size_t n) {
+  struct mg_str s1 = str1;
+  struct mg_str s2 = str2;
+
+  if (s1.len > n) {
+    s1.len = n;
+  }
+  if (s2.len > n) {
+    s2.len = n;
+  }
+  return mg_strcmp(s1, s2);
+}
+#ifdef MG_MODULE_LINES
+#line 1 "common/sha1.c"
+#endif
+/* Copyright(c) By Steve Reid <steve@edmweb.com> */
+/* 100% Public Domain */
+
+/* Amalgamated: #include "common/sha1.h" */
+
+#if !DISABLE_SHA1 && !defined(EXCLUDE_COMMON)
+
+/* Amalgamated: #include "common/cs_endian.h" */
+
+#define SHA1HANDSOFF
+#if defined(__sun)
+/* Amalgamated: #include "common/solarisfixes.h" */
+#endif
+
+union char64long16 {
+  unsigned char c[64];
+  uint32_t l[16];
+};
+
+#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
+
+static uint32_t blk0(union char64long16 *block, int i) {
+/* Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN */
+#if BYTE_ORDER == LITTLE_ENDIAN
+  block->l[i] =
+      (rol(block->l[i], 24) & 0xFF00FF00) | (rol(block->l[i], 8) & 0x00FF00FF);
+#endif
+  return block->l[i];
+}
+
+/* Avoid redefine warning (ARM /usr/include/sys/ucontext.h define R0~R4) */
+#undef blk
+#undef R0
+#undef R1
+#undef R2
+#undef R3
+#undef R4
+
+#define blk(i)                                                               \
+  (block->l[i & 15] = rol(block->l[(i + 13) & 15] ^ block->l[(i + 8) & 15] ^ \
+                              block->l[(i + 2) & 15] ^ block->l[i & 15],     \
+                          1))
+#define R0(v, w, x, y, z, i)                                          \
+  z += ((w & (x ^ y)) ^ y) + blk0(block, i) + 0x5A827999 + rol(v, 5); \
+  w = rol(w, 30);
+#define R1(v, w, x, y, z, i)                                  \
+  z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5); \
+  w = rol(w, 30);
+#define R2(v, w, x, y, z, i)                          \
+  z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5); \
+  w = rol(w, 30);
+#define R3(v, w, x, y, z, i)                                        \
+  z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5); \
+  w = rol(w, 30);
+#define R4(v, w, x, y, z, i)                          \
+  z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5); \
+  w = rol(w, 30);
+
+void cs_sha1_transform(uint32_t state[5], const unsigned char buffer[64]) {
+  uint32_t a, b, c, d, e;
+  union char64long16 block[1];
+
+  memcpy(block, buffer, 64);
+  a = state[0];
+  b = state[1];
+  c = state[2];
+  d = state[3];
+  e = state[4];
+  R0(a, b, c, d, e, 0);
+  R0(e, a, b, c, d, 1);
+  R0(d, e, a, b, c, 2);
+  R0(c, d, e, a, b, 3);
+  R0(b, c, d, e, a, 4);
+  R0(a, b, c, d, e, 5);
+  R0(e, a, b, c, d, 6);
+  R0(d, e, a, b, c, 7);
+  R0(c, d, e, a, b, 8);
+  R0(b, c, d, e, a, 9);
+  R0(a, b, c, d, e, 10);
+  R0(e, a, b, c, d, 11);
+  R0(d, e, a, b, c, 12);
+  R0(c, d, e, a, b, 13);
+  R0(b, c, d, e, a, 14);
+  R0(a, b, c, d, e, 15);
+  R1(e, a, b, c, d, 16);
+  R1(d, e, a, b, c, 17);
+  R1(c, d, e, a, b, 18);
+  R1(b, c, d, e, a, 19);
+  R2(a, b, c, d, e, 20);
+  R2(e, a, b, c, d, 21);
+  R2(d, e, a, b, c, 22);
+  R2(c, d, e, a, b, 23);
+  R2(b, c, d, e, a, 24);
+  R2(a, b, c, d, e, 25);
+  R2(e, a, b, c, d, 26);
+  R2(d, e, a, b, c, 27);
+  R2(c, d, e, a, b, 28);
+  R2(b, c, d, e, a, 29);
+  R2(a, b, c, d, e, 30);
+  R2(e, a, b, c, d, 31);
+  R2(d, e, a, b, c, 32);
+  R2(c, d, e, a, b, 33);
+  R2(b, c, d, e, a, 34);
+  R2(a, b, c, d, e, 35);
+  R2(e, a, b, c, d, 36);
+  R2(d, e, a, b, c, 37);
+  R2(c, d, e, a, b, 38);
+  R2(b, c, d, e, a, 39);
+  R3(a, b, c, d, e, 40);
+  R3(e, a, b, c, d, 41);
+  R3(d, e, a, b, c, 42);
+  R3(c, d, e, a, b, 43);
+  R3(b, c, d, e, a, 44);
+  R3(a, b, c, d, e, 45);
+  R3(e, a, b, c, d, 46);
+  R3(d, e, a, b, c, 47);
+  R3(c, d, e, a, b, 48);
+  R3(b, c, d, e, a, 49);
+  R3(a, b, c, d, e, 50);
+  R3(e, a, b, c, d, 51);
+  R3(d, e, a, b, c, 52);
+  R3(c, d, e, a, b, 53);
+  R3(b, c, d, e, a, 54);
+  R3(a, b, c, d, e, 55);
+  R3(e, a, b, c, d, 56);
+  R3(d, e, a, b, c, 57);
+  R3(c, d, e, a, b, 58);
+  R3(b, c, d, e, a, 59);
+  R4(a, b, c, d, e, 60);
+  R4(e, a, b, c, d, 61);
+  R4(d, e, a, b, c, 62);
+  R4(c, d, e, a, b, 63);
+  R4(b, c, d, e, a, 64);
+  R4(a, b, c, d, e, 65);
+  R4(e, a, b, c, d, 66);
+  R4(d, e, a, b, c, 67);
+  R4(c, d, e, a, b, 68);
+  R4(b, c, d, e, a, 69);
+  R4(a, b, c, d, e, 70);
+  R4(e, a, b, c, d, 71);
+  R4(d, e, a, b, c, 72);
+  R4(c, d, e, a, b, 73);
+  R4(b, c, d, e, a, 74);
+  R4(a, b, c, d, e, 75);
+  R4(e, a, b, c, d, 76);
+  R4(d, e, a, b, c, 77);
+  R4(c, d, e, a, b, 78);
+  R4(b, c, d, e, a, 79);
+  state[0] += a;
+  state[1] += b;
+  state[2] += c;
+  state[3] += d;
+  state[4] += e;
+  /* Erase working structures. The order of operations is important,
+   * used to ensure that compiler doesn't optimize those out. */
+  memset(block, 0, sizeof(block));
+  a = b = c = d = e = 0;
+  (void) a;
+  (void) b;
+  (void) c;
+  (void) d;
+  (void) e;
+}
+
+void cs_sha1_init(cs_sha1_ctx *context) {
+  context->state[0] = 0x67452301;
+  context->state[1] = 0xEFCDAB89;
+  context->state[2] = 0x98BADCFE;
+  context->state[3] = 0x10325476;
+  context->state[4] = 0xC3D2E1F0;
+  context->count[0] = context->count[1] = 0;
+}
+
+void cs_sha1_update(cs_sha1_ctx *context, const unsigned char *data,
+                    uint32_t len) {
+  uint32_t i, j;
+
+  j = context->count[0];
+  if ((context->count[0] += len << 3) < j) context->count[1]++;
+  context->count[1] += (len >> 29);
+  j = (j >> 3) & 63;
+  if ((j + len) > 63) {
+    memcpy(&context->buffer[j], data, (i = 64 - j));
+    cs_sha1_transform(context->state, context->buffer);
+    for (; i + 63 < len; i += 64) {
+      cs_sha1_transform(context->state, &data[i]);
+    }
+    j = 0;
+  } else
+    i = 0;
+  memcpy(&context->buffer[j], &data[i], len - i);
+}
+
+void cs_sha1_final(unsigned char digest[20], cs_sha1_ctx *context) {
+  unsigned i;
+  unsigned char finalcount[8], c;
+
+  for (i = 0; i < 8; i++) {
+    finalcount[i] = (unsigned char) ((context->count[(i >= 4 ? 0 : 1)] >>
+                                      ((3 - (i & 3)) * 8)) &
+                                     255);
+  }
+  c = 0200;
+  cs_sha1_update(context, &c, 1);
+  while ((context->count[0] & 504) != 448) {
+    c = 0000;
+    cs_sha1_update(context, &c, 1);
+  }
+  cs_sha1_update(context, finalcount, 8);
+  for (i = 0; i < 20; i++) {
+    digest[i] =
+        (unsigned char) ((context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
+  }
+  memset(context, '\0', sizeof(*context));
+  memset(&finalcount, '\0', sizeof(finalcount));
+}
+
+void cs_hmac_sha1(const unsigned char *key, size_t keylen,
+                  const unsigned char *data, size_t datalen,
+                  unsigned char out[20]) {
+  cs_sha1_ctx ctx;
+  unsigned char buf1[64], buf2[64], tmp_key[20], i;
+
+  if (keylen > sizeof(buf1)) {
+    cs_sha1_init(&ctx);
+    cs_sha1_update(&ctx, key, keylen);
+    cs_sha1_final(tmp_key, &ctx);
+    key = tmp_key;
+    keylen = sizeof(tmp_key);
+  }
+
+  memset(buf1, 0, sizeof(buf1));
+  memset(buf2, 0, sizeof(buf2));
+  memcpy(buf1, key, keylen);
+  memcpy(buf2, key, keylen);
+
+  for (i = 0; i < sizeof(buf1); i++) {
+    buf1[i] ^= 0x36;
+    buf2[i] ^= 0x5c;
+  }
+
+  cs_sha1_init(&ctx);
+  cs_sha1_update(&ctx, buf1, sizeof(buf1));
+  cs_sha1_update(&ctx, data, datalen);
+  cs_sha1_final(out, &ctx);
+
+  cs_sha1_init(&ctx);
+  cs_sha1_update(&ctx, buf2, sizeof(buf2));
+  cs_sha1_update(&ctx, out, 20);
+  cs_sha1_final(out, &ctx);
+}
+
+#endif /* EXCLUDE_COMMON */
+#ifdef MG_MODULE_LINES
+#line 1 "common/str_util.c"
+#endif
+/*
+ * Copyright (c) 2015 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef EXCLUDE_COMMON
+
+/* Amalgamated: #include "common/platform.h" */
+/* Amalgamated: #include "common/str_util.h" */
+
+#ifndef C_DISABLE_BUILTIN_SNPRINTF
+#define C_DISABLE_BUILTIN_SNPRINTF 0
+#endif
+
+#ifndef MG_MALLOC
+#define MG_MALLOC malloc
+#endif
+
+#ifndef MG_FREE
+#define MG_FREE free
+#endif
+
+WEAK size_t c_strnlen(const char *s, size_t maxlen) {
+  size_t l = 0;
+  for (; l < maxlen && s[l] != '\0'; l++) {
+  }
+  return l;
+}
+
+#define C_SNPRINTF_APPEND_CHAR(ch)       \
+  do {                                   \
+    if (i < (int) buf_size) buf[i] = ch; \
+    i++;                                 \
+  } while (0)
+
+#define C_SNPRINTF_FLAG_ZERO 1
+
+#if C_DISABLE_BUILTIN_SNPRINTF
+WEAK int c_vsnprintf(char *buf, size_t buf_size, const char *fmt, va_list ap) {
+  return vsnprintf(buf, buf_size, fmt, ap);
+}
+#else
+static int c_itoa(char *buf, size_t buf_size, int64_t num, int base, int flags,
+                  int field_width) {
+  char tmp[40];
+  int i = 0, k = 0, neg = 0;
+
+  if (num < 0) {
+    neg++;
+    num = -num;
+  }
+
+  /* Print into temporary buffer - in reverse order */
+  do {
+    int rem = num % base;
+    if (rem < 10) {
+      tmp[k++] = '0' + rem;
+    } else {
+      tmp[k++] = 'a' + (rem - 10);
+    }
+    num /= base;
+  } while (num > 0);
+
+  /* Zero padding */
+  if (flags && C_SNPRINTF_FLAG_ZERO) {
+    while (k < field_width && k < (int) sizeof(tmp) - 1) {
+      tmp[k++] = '0';
+    }
+  }
+
+  /* And sign */
+  if (neg) {
+    tmp[k++] = '-';
+  }
+
+  /* Now output */
+  while (--k >= 0) {
+    C_SNPRINTF_APPEND_CHAR(tmp[k]);
+  }
+
+  return i;
+}
+
+WEAK int c_vsnprintf(char *buf, size_t buf_size, const char *fmt, va_list ap) {
+  int ch, i = 0, len_mod, flags, precision, field_width;
+
+  while ((ch = *fmt++) != '\0') {
+    if (ch != '%') {
+      C_SNPRINTF_APPEND_CHAR(ch);
+    } else {
+      /*
+       * Conversion specification:
+       *   zero or more flags (one of: # 0 - <space> + ')
+       *   an optional minimum  field  width (digits)
+       *   an  optional precision (. followed by digits, or *)
+       *   an optional length modifier (one of: hh h l ll L q j z t)
+       *   conversion specifier (one of: d i o u x X e E f F g G a A c s p n)
+       */
+      flags = field_width = precision = len_mod = 0;
+
+      /* Flags. only zero-pad flag is supported. */
+      if (*fmt == '0') {
+        flags |= C_SNPRINTF_FLAG_ZERO;
+      }
+
+      /* Field width */
+      while (*fmt >= '0' && *fmt <= '9') {
+        field_width *= 10;
+        field_width += *fmt++ - '0';
+      }
+      /* Dynamic field width */
+      if (*fmt == '*') {
+        field_width = va_arg(ap, int);
+        fmt++;
+      }
+
+      /* Precision */
+      if (*fmt == '.') {
+        fmt++;
+        if (*fmt == '*') {
+          precision = va_arg(ap, int);
+          fmt++;
+        } else {
+          while (*fmt >= '0' && *fmt <= '9') {
+            precision *= 10;
+            precision += *fmt++ - '0';
+          }
+        }
+      }
+
+      /* Length modifier */
+      switch (*fmt) {
+        case 'h':
+        case 'l':
+        case 'L':
+        case 'I':
+        case 'q':
+        case 'j':
+        case 'z':
+        case 't':
+          len_mod = *fmt++;
+          if (*fmt == 'h') {
+            len_mod = 'H';
+            fmt++;
+          }
+          if (*fmt == 'l') {
+            len_mod = 'q';
+            fmt++;
+          }
+          break;
+      }
+
+      ch = *fmt++;
+      if (ch == 's') {
+        const char *s = va_arg(ap, const char *); /* Always fetch parameter */
+        int j;
+        int pad = field_width - (precision >= 0 ? c_strnlen(s, precision) : 0);
+        for (j = 0; j < pad; j++) {
+          C_SNPRINTF_APPEND_CHAR(' ');
+        }
+
+        /* `s` may be NULL in case of %.*s */
+        if (s != NULL) {
+          /* Ignore negative and 0 precisions */
+          for (j = 0; (precision <= 0 || j < precision) && s[j] != '\0'; j++) {
+            C_SNPRINTF_APPEND_CHAR(s[j]);
+          }
+        }
+      } else if (ch == 'c') {
+        ch = va_arg(ap, int); /* Always fetch parameter */
+        C_SNPRINTF_APPEND_CHAR(ch);
+      } else if (ch == 'd' && len_mod == 0) {
+        i += c_itoa(buf + i, buf_size - i, va_arg(ap, int), 10, flags,
+                    field_width);
+      } else if (ch == 'd' && len_mod == 'l') {
+        i += c_itoa(buf + i, buf_size - i, va_arg(ap, long), 10, flags,
+                    field_width);
+#ifdef SSIZE_MAX
+      } else if (ch == 'd' && len_mod == 'z') {
+        i += c_itoa(buf + i, buf_size - i, va_arg(ap, ssize_t), 10, flags,
+                    field_width);
+#endif
+      } else if (ch == 'd' && len_mod == 'q') {
+        i += c_itoa(buf + i, buf_size - i, va_arg(ap, int64_t), 10, flags,
+                    field_width);
+      } else if ((ch == 'x' || ch == 'u') && len_mod == 0) {
+        i += c_itoa(buf + i, buf_size - i, va_arg(ap, unsigned),
+                    ch == 'x' ? 16 : 10, flags, field_width);
+      } else if ((ch == 'x' || ch == 'u') && len_mod == 'l') {
+        i += c_itoa(buf + i, buf_size - i, va_arg(ap, unsigned long),
+                    ch == 'x' ? 16 : 10, flags, field_width);
+      } else if ((ch == 'x' || ch == 'u') && len_mod == 'z') {
+        i += c_itoa(buf + i, buf_size - i, va_arg(ap, size_t),
+                    ch == 'x' ? 16 : 10, flags, field_width);
+      } else if (ch == 'p') {
+        unsigned long num = (unsigned long) (uintptr_t) va_arg(ap, void *);
+        C_SNPRINTF_APPEND_CHAR('0');
+        C_SNPRINTF_APPEND_CHAR('x');
+        i += c_itoa(buf + i, buf_size - i, num, 16, flags, 0);
+      } else {
+#ifndef NO_LIBC
+        /*
+         * TODO(lsm): abort is not nice in a library, remove it
+         * Also, ESP8266 SDK doesn't have it
+         */
+        abort();
+#endif
+      }
+    }
+  }
+
+  /* Zero-terminate the result */
+  if (buf_size > 0) {
+    buf[i < (int) buf_size ? i : (int) buf_size - 1] = '\0';
+  }
+
+  return i;
+}
+#endif
+
+WEAK int c_snprintf(char *buf, size_t buf_size, const char *fmt, ...) {
+  int result;
+  va_list ap;
+  va_start(ap, fmt);
+  result = c_vsnprintf(buf, buf_size, fmt, ap);
+  va_end(ap);
+  return result;
+}
+
+#ifdef _WIN32
+int to_wchar(const char *path, wchar_t *wbuf, size_t wbuf_len) {
+  int ret;
+  char buf[MAX_PATH * 2], buf2[MAX_PATH * 2], *p;
+
+  strncpy(buf, path, sizeof(buf));
+  buf[sizeof(buf) - 1] = '\0';
+
+  /* Trim trailing slashes. Leave backslash for paths like "X:\" */
+  p = buf + strlen(buf) - 1;
+  while (p > buf && p[-1] != ':' && (p[0] == '\\' || p[0] == '/')) *p-- = '\0';
+
+  memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
+  ret = MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
+
+  /*
+   * Convert back to Unicode. If doubly-converted string does not match the
+   * original, something is fishy, reject.
+   */
+  WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
+                      NULL, NULL);
+  if (strcmp(buf, buf2) != 0) {
+    wbuf[0] = L'\0';
+    ret = 0;
+  }
+
+  return ret;
+}
+#endif /* _WIN32 */
+
+/* The simplest O(mn) algorithm. Better implementation are GPLed */
+WEAK const char *c_strnstr(const char *s, const char *find, size_t slen) {
+  size_t find_length = strlen(find);
+  size_t i;
+
+  for (i = 0; i < slen; i++) {
+    if (i + find_length > slen) {
+      return NULL;
+    }
+
+    if (strncmp(&s[i], find, find_length) == 0) {
+      return &s[i];
+    }
+  }
+
+  return NULL;
+}
+
+#if CS_ENABLE_STRDUP
+WEAK char *strdup(const char *src) {
+  size_t len = strlen(src) + 1;
+  char *ret = MG_MALLOC(len);
+  if (ret != NULL) {
+    strcpy(ret, src);
+  }
+  return ret;
+}
+#endif
+
+WEAK void cs_to_hex(char *to, const unsigned char *p, size_t len) {
+  static const char *hex = "0123456789abcdef";
+
+  for (; len--; p++) {
+    *to++ = hex[p[0] >> 4];
+    *to++ = hex[p[0] & 0x0f];
+  }
+  *to = '\0';
+}
+
+static int fourbit(int ch) {
+  if (ch >= '0' && ch <= '9') {
+    return ch - '0';
+  } else if (ch >= 'a' && ch <= 'f') {
+    return ch - 'a' + 10;
+  } else if (ch >= 'A' && ch <= 'F') {
+    return ch - 'A' + 10;
+  }
+  return 0;
+}
+
+WEAK void cs_from_hex(char *to, const char *p, size_t len) {
+  size_t i;
+
+  for (i = 0; i < len; i += 2) {
+    *to++ = (fourbit(p[i]) << 4) + fourbit(p[i + 1]);
+  }
+  *to = '\0';
+}
+
+#if CS_ENABLE_TO64
+WEAK int64_t cs_to64(const char *s) {
+  int64_t result = 0;
+  int64_t neg = 1;
+  while (*s && isspace((unsigned char) *s)) s++;
+  if (*s == '-') {
+    neg = -1;
+    s++;
+  }
+  while (isdigit((unsigned char) *s)) {
+    result *= 10;
+    result += (*s - '0');
+    s++;
+  }
+  return result * neg;
+}
+#endif
+
+static int str_util_lowercase(const char *s) {
+  return tolower(*(const unsigned char *) s);
+}
+
+WEAK int mg_ncasecmp(const char *s1, const char *s2, size_t len) {
+  int diff = 0;
+
+  if (len > 0) do {
+      diff = str_util_lowercase(s1++) - str_util_lowercase(s2++);
+    } while (diff == 0 && s1[-1] != '\0' && --len > 0);
+
+  return diff;
+}
+
+WEAK int mg_casecmp(const char *s1, const char *s2) {
+  return mg_ncasecmp(s1, s2, (size_t) ~0);
+}
+
+WEAK int mg_asprintf(char **buf, size_t size, const char *fmt, ...) {
+  int ret;
+  va_list ap;
+  va_start(ap, fmt);
+  ret = mg_avprintf(buf, size, fmt, ap);
+  va_end(ap);
+  return ret;
+}
+
+WEAK int mg_avprintf(char **buf, size_t size, const char *fmt, va_list ap) {
+  va_list ap_copy;
+  int len;
+
+  va_copy(ap_copy, ap);
+  len = vsnprintf(*buf, size, fmt, ap_copy);
+  va_end(ap_copy);
+
+  if (len < 0) {
+    /* eCos and Windows are not standard-compliant and return -1 when
+     * the buffer is too small. Keep allocating larger buffers until we
+     * succeed or out of memory. */
+    *buf = NULL; /* LCOV_EXCL_START */
+    while (len < 0) {
+      MG_FREE(*buf);
+      size *= 2;
+      if ((*buf = (char *) MG_MALLOC(size)) == NULL) break;
+      va_copy(ap_copy, ap);
+      len = vsnprintf(*buf, size, fmt, ap_copy);
+      va_end(ap_copy);
+    }
+    /* LCOV_EXCL_STOP */
+  } else if (len >= (int) size) {
+    /* Standard-compliant code path. Allocate a buffer that is large enough. */
+    if ((*buf = (char *) MG_MALLOC(len + 1)) == NULL) {
+      len = -1; /* LCOV_EXCL_LINE */
+    } else {    /* LCOV_EXCL_LINE */
+      va_copy(ap_copy, ap);
+      len = vsnprintf(*buf, len + 1, fmt, ap_copy);
+      va_end(ap_copy);
+    }
+  }
+
+  return len;
+}
+
+#endif /* EXCLUDE_COMMON */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/tun.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_MONGOOSE_SRC_TUN_H_
+#define CS_MONGOOSE_SRC_TUN_H_
+
+#if MG_ENABLE_TUN
+
+/* Amalgamated: #include "mongoose/src/net.h" */
+/* Amalgamated: #include "common/mg_str.h" */
+
+#ifndef MG_TUN_RECONNECT_INTERVAL
+#define MG_TUN_RECONNECT_INTERVAL 1
+#endif
+
+#define MG_TUN_PROTO_NAME "mg_tun"
+
+#define MG_TUN_DATA_FRAME 0x0
+#define MG_TUN_F_END_STREAM 0x1
+
+/*
+ * MG TUN frame format is loosely based on HTTP/2.
+ * However since the communication happens via WebSocket
+ * there is no need to encode the frame length, since that's
+ * solved by WebSocket framing.
+ *
+ * TODO(mkm): Detailed description of the protocol.
+ */
+struct mg_tun_frame {
+  uint8_t type;
+  uint8_t flags;
+  uint32_t stream_id; /* opaque stream identifier */
+  struct mg_str body;
+};
+
+struct mg_tun_ssl_opts {
+#if MG_ENABLE_SSL
+  const char *ssl_cert;
+  const char *ssl_key;
+  const char *ssl_ca_cert;
+#else
+  int dummy; /* some compilers don't like empty structs */
+#endif
+};
+
+struct mg_tun_client {
+  struct mg_mgr *mgr;
+  struct mg_iface *iface;
+  const char *disp_url;
+  struct mg_tun_ssl_opts ssl;
+
+  uint32_t last_stream_id; /* stream id of most recently accepted connection */
+
+  struct mg_connection *disp;
+  struct mg_connection *listener;
+  struct mg_connection *reconnect;
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+struct mg_connection *mg_tun_bind_opt(struct mg_mgr *mgr,
+                                      const char *dispatcher,
+                                      mg_event_handler_t handler,
+                                      struct mg_bind_opts opts);
+
+int mg_tun_parse_frame(void *data, size_t len, struct mg_tun_frame *frame);
+
+void mg_tun_send_frame(struct mg_connection *ws, uint32_t stream_id,
+                       uint8_t type, uint8_t flags, struct mg_str msg);
+
+void mg_tun_destroy_client(struct mg_tun_client *client);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* MG_ENABLE_TUN */
+
+#endif /* CS_MONGOOSE_SRC_TUN_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/net.c"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ *
+ * This software is dual-licensed: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation. For the terms of this
+ * license, see <http://www.gnu.org/licenses/>.
+ *
+ * You are free to use this software under the terms of the GNU General
+ * Public License, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * Alternatively, you can license this software under a commercial
+ * license, as set out in <https://www.cesanta.com/license>.
+ */
+
+/* Amalgamated: #include "common/cs_time.h" */
+/* Amalgamated: #include "mongoose/src/dns.h" */
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/resolv.h" */
+/* Amalgamated: #include "mongoose/src/util.h" */
+/* Amalgamated: #include "mongoose/src/tun.h" */
+
+#define MG_MAX_HOST_LEN 200
+
+#define MG_COPY_COMMON_CONNECTION_OPTIONS(dst, src) \
+  memcpy(dst, src, sizeof(*dst));
+
+/* Which flags can be pre-set by the user at connection creation time. */
+#define _MG_ALLOWED_CONNECT_FLAGS_MASK                                   \
+  (MG_F_USER_1 | MG_F_USER_2 | MG_F_USER_3 | MG_F_USER_4 | MG_F_USER_5 | \
+   MG_F_USER_6 | MG_F_WEBSOCKET_NO_DEFRAG | MG_F_ENABLE_BROADCAST)
+/* Which flags should be modifiable by user's callbacks. */
+#define _MG_CALLBACK_MODIFIABLE_FLAGS_MASK                               \
+  (MG_F_USER_1 | MG_F_USER_2 | MG_F_USER_3 | MG_F_USER_4 | MG_F_USER_5 | \
+   MG_F_USER_6 | MG_F_WEBSOCKET_NO_DEFRAG | MG_F_SEND_AND_CLOSE |        \
+   MG_F_CLOSE_IMMEDIATELY | MG_F_IS_WEBSOCKET | MG_F_DELETE_CHUNK)
+
+#ifndef intptr_t
+#define intptr_t long
+#endif
+
+MG_INTERNAL void mg_add_conn(struct mg_mgr *mgr, struct mg_connection *c) {
+  DBG(("%p %p", mgr, c));
+  c->mgr = mgr;
+  c->next = mgr->active_connections;
+  mgr->active_connections = c;
+  c->prev = NULL;
+  if (c->next != NULL) c->next->prev = c;
+  if (c->sock != INVALID_SOCKET) {
+    c->iface->vtable->add_conn(c);
+  }
+}
+
+MG_INTERNAL void mg_remove_conn(struct mg_connection *conn) {
+  if (conn->prev == NULL) conn->mgr->active_connections = conn->next;
+  if (conn->prev) conn->prev->next = conn->next;
+  if (conn->next) conn->next->prev = conn->prev;
+  conn->prev = conn->next = NULL;
+  conn->iface->vtable->remove_conn(conn);
+}
+
+MG_INTERNAL void mg_call(struct mg_connection *nc,
+                         mg_event_handler_t ev_handler, int ev, void *ev_data) {
+  if (ev_handler == NULL) {
+    /*
+     * If protocol handler is specified, call it. Otherwise, call user-specified
+     * event handler.
+     */
+    ev_handler = nc->proto_handler ? nc->proto_handler : nc->handler;
+  }
+  if (ev != MG_EV_POLL) {
+    DBG(("%p %s ev=%d ev_data=%p flags=%lu rmbl=%d smbl=%d", nc,
+         ev_handler == nc->handler ? "user" : "proto", ev, ev_data, nc->flags,
+         (int) nc->recv_mbuf.len, (int) nc->send_mbuf.len));
+  }
+
+#if !defined(NO_LIBC) && MG_ENABLE_HEXDUMP
+  /* LCOV_EXCL_START */
+  if (nc->mgr->hexdump_file != NULL && ev != MG_EV_POLL &&
+      ev != MG_EV_SEND /* handled separately */) {
+    if (ev == MG_EV_RECV) {
+      mg_hexdump_connection(nc, nc->mgr->hexdump_file, nc->recv_mbuf.buf,
+                            *(int *) ev_data, ev);
+    } else {
+      mg_hexdump_connection(nc, nc->mgr->hexdump_file, NULL, 0, ev);
+    }
+  }
+/* LCOV_EXCL_STOP */
+#endif
+  if (ev_handler != NULL) {
+    unsigned long flags_before = nc->flags;
+    size_t recv_mbuf_before = nc->recv_mbuf.len, recved;
+    ev_handler(nc, ev, ev_data);
+    recved = (recv_mbuf_before - nc->recv_mbuf.len);
+    /* Prevent user handler from fiddling with system flags. */
+    if (ev_handler == nc->handler && nc->flags != flags_before) {
+      nc->flags = (flags_before & ~_MG_CALLBACK_MODIFIABLE_FLAGS_MASK) |
+                  (nc->flags & _MG_CALLBACK_MODIFIABLE_FLAGS_MASK);
+    }
+    if (recved > 0 && !(nc->flags & MG_F_UDP)) {
+      nc->iface->vtable->recved(nc, recved);
+    }
+  }
+  if (ev != MG_EV_POLL) {
+    DBG(("%p after %s flags=%lu rmbl=%d smbl=%d", nc,
+         ev_handler == nc->handler ? "user" : "proto", nc->flags,
+         (int) nc->recv_mbuf.len, (int) nc->send_mbuf.len));
+  }
+}
+
+void mg_if_timer(struct mg_connection *c, double now) {
+  if (c->ev_timer_time > 0 && now >= c->ev_timer_time) {
+    double old_value = c->ev_timer_time;
+    mg_call(c, NULL, MG_EV_TIMER, &now);
+    /*
+     * To prevent timer firing all the time, reset the timer after delivery.
+     * However, in case user sets it to new value, do not reset.
+     */
+    if (c->ev_timer_time == old_value) {
+      c->ev_timer_time = 0;
+    }
+  }
+}
+
+void mg_if_poll(struct mg_connection *nc, time_t now) {
+  if (!(nc->flags & MG_F_SSL) || (nc->flags & MG_F_SSL_HANDSHAKE_DONE)) {
+    mg_call(nc, NULL, MG_EV_POLL, &now);
+  }
+}
+
+static void mg_destroy_conn(struct mg_connection *conn, int destroy_if) {
+  if (destroy_if) conn->iface->vtable->destroy_conn(conn);
+  if (conn->proto_data != NULL && conn->proto_data_destructor != NULL) {
+    conn->proto_data_destructor(conn->proto_data);
+  }
+#if MG_ENABLE_SSL
+  mg_ssl_if_conn_free(conn);
+#endif
+  mbuf_free(&conn->recv_mbuf);
+  mbuf_free(&conn->send_mbuf);
+
+  memset(conn, 0, sizeof(*conn));
+  MG_FREE(conn);
+}
+
+void mg_close_conn(struct mg_connection *conn) {
+  DBG(("%p %lu %d", conn, conn->flags, conn->sock));
+  mg_remove_conn(conn);
+  conn->iface->vtable->destroy_conn(conn);
+  mg_call(conn, NULL, MG_EV_CLOSE, NULL);
+  mg_destroy_conn(conn, 0 /* destroy_if */);
+}
+
+void mg_mgr_init(struct mg_mgr *m, void *user_data) {
+  struct mg_mgr_init_opts opts;
+  memset(&opts, 0, sizeof(opts));
+  mg_mgr_init_opt(m, user_data, opts);
+}
+
+void mg_mgr_init_opt(struct mg_mgr *m, void *user_data,
+                     struct mg_mgr_init_opts opts) {
+  memset(m, 0, sizeof(*m));
+#if MG_ENABLE_BROADCAST
+  m->ctl[0] = m->ctl[1] = INVALID_SOCKET;
+#endif
+  m->user_data = user_data;
+
+#ifdef _WIN32
+  {
+    WSADATA data;
+    WSAStartup(MAKEWORD(2, 2), &data);
+  }
+#elif defined(__unix__)
+  /* Ignore SIGPIPE signal, so if client cancels the request, it
+   * won't kill the whole process. */
+  signal(SIGPIPE, SIG_IGN);
+#endif
+
+#if MG_ENABLE_SSL
+  {
+    static int init_done;
+    if (!init_done) {
+      mg_ssl_if_init();
+      init_done++;
+    }
+  }
+#endif
+  {
+    int i;
+    if (opts.num_ifaces == 0) {
+      opts.num_ifaces = mg_num_ifaces;
+      opts.ifaces = mg_ifaces;
+    }
+    if (opts.main_iface != NULL) {
+      opts.ifaces[MG_MAIN_IFACE] = opts.main_iface;
+    }
+    m->num_ifaces = opts.num_ifaces;
+    m->ifaces =
+        (struct mg_iface **) MG_MALLOC(sizeof(*m->ifaces) * opts.num_ifaces);
+    for (i = 0; i < mg_num_ifaces; i++) {
+      m->ifaces[i] = mg_if_create_iface(opts.ifaces[i], m);
+      m->ifaces[i]->vtable->init(m->ifaces[i]);
+    }
+  }
+  DBG(("=================================="));
+  DBG(("init mgr=%p", m));
+}
+
+#if MG_ENABLE_JAVASCRIPT
+static enum v7_err mg_send_js(struct v7 *v7, v7_val_t *res) {
+  v7_val_t arg0 = v7_arg(v7, 0);
+  v7_val_t arg1 = v7_arg(v7, 1);
+  struct mg_connection *c = (struct mg_connection *) v7_get_ptr(v7, arg0);
+  size_t len = 0;
+
+  if (v7_is_string(arg1)) {
+    const char *data = v7_get_string(v7, &arg1, &len);
+    mg_send(c, data, len);
+  }
+
+  *res = v7_mk_number(v7, len);
+
+  return V7_OK;
+}
+
+enum v7_err mg_enable_javascript(struct mg_mgr *m, struct v7 *v7,
+                                 const char *init_file_name) {
+  v7_val_t v;
+  m->v7 = v7;
+  v7_set_method(v7, v7_get_global(v7), "mg_send", mg_send_js);
+  return v7_exec_file(v7, init_file_name, &v);
+}
+#endif
+
+void mg_mgr_free(struct mg_mgr *m) {
+  struct mg_connection *conn, *tmp_conn;
+
+  DBG(("%p", m));
+  if (m == NULL) return;
+  /* Do one last poll, see https://github.com/cesanta/mongoose/issues/286 */
+  mg_mgr_poll(m, 0);
+
+#if MG_ENABLE_BROADCAST
+  if (m->ctl[0] != INVALID_SOCKET) closesocket(m->ctl[0]);
+  if (m->ctl[1] != INVALID_SOCKET) closesocket(m->ctl[1]);
+  m->ctl[0] = m->ctl[1] = INVALID_SOCKET;
+#endif
+
+  for (conn = m->active_connections; conn != NULL; conn = tmp_conn) {
+    tmp_conn = conn->next;
+    mg_close_conn(conn);
+  }
+
+  {
+    int i;
+    for (i = 0; i < m->num_ifaces; i++) {
+      m->ifaces[i]->vtable->free(m->ifaces[i]);
+      MG_FREE(m->ifaces[i]);
+    }
+    MG_FREE(m->ifaces);
+  }
+}
+
+time_t mg_mgr_poll(struct mg_mgr *m, int timeout_ms) {
+  int i;
+  time_t now = 0; /* oh GCC, seriously ? */
+
+  if (m->num_ifaces == 0) {
+    LOG(LL_ERROR, ("cannot poll: no interfaces"));
+    return 0;
+  }
+
+  for (i = 0; i < m->num_ifaces; i++) {
+    now = m->ifaces[i]->vtable->poll(m->ifaces[i], timeout_ms);
+  }
+  return now;
+}
+
+int mg_vprintf(struct mg_connection *nc, const char *fmt, va_list ap) {
+  char mem[MG_VPRINTF_BUFFER_SIZE], *buf = mem;
+  int len;
+
+  if ((len = mg_avprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
+    mg_send(nc, buf, len);
+  }
+  if (buf != mem && buf != NULL) {
+    MG_FREE(buf); /* LCOV_EXCL_LINE */
+  }               /* LCOV_EXCL_LINE */
+
+  return len;
+}
+
+int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
+  int len;
+  va_list ap;
+  va_start(ap, fmt);
+  len = mg_vprintf(conn, fmt, ap);
+  va_end(ap);
+  return len;
+}
+
+#if MG_ENABLE_SYNC_RESOLVER
+/* TODO(lsm): use non-blocking resolver */
+static int mg_resolve2(const char *host, struct in_addr *ina) {
+#if MG_ENABLE_GETADDRINFO
+  int rv = 0;
+  struct addrinfo hints, *servinfo, *p;
+  struct sockaddr_in *h = NULL;
+  memset(&hints, 0, sizeof hints);
+  hints.ai_family = AF_INET;
+  hints.ai_socktype = SOCK_STREAM;
+  if ((rv = getaddrinfo(host, NULL, NULL, &servinfo)) != 0) {
+    DBG(("getaddrinfo(%s) failed: %s", host, strerror(mg_get_errno())));
+    return 0;
+  }
+  for (p = servinfo; p != NULL; p = p->ai_next) {
+    memcpy(&h, &p->ai_addr, sizeof(struct sockaddr_in *));
+    memcpy(ina, &h->sin_addr, sizeof(ina));
+  }
+  freeaddrinfo(servinfo);
+  return 1;
+#else
+  struct hostent *he;
+  if ((he = gethostbyname(host)) == NULL) {
+    DBG(("gethostbyname(%s) failed: %s", host, strerror(mg_get_errno())));
+  } else {
+    memcpy(ina, he->h_addr_list[0], sizeof(*ina));
+    return 1;
+  }
+  return 0;
+#endif /* MG_ENABLE_GETADDRINFO */
+}
+
+int mg_resolve(const char *host, char *buf, size_t n) {
+  struct in_addr ad;
+  return mg_resolve2(host, &ad) ? snprintf(buf, n, "%s", inet_ntoa(ad)) : 0;
+}
+#endif /* MG_ENABLE_SYNC_RESOLVER */
+
+MG_INTERNAL struct mg_connection *mg_create_connection_base(
+    struct mg_mgr *mgr, mg_event_handler_t callback,
+    struct mg_add_sock_opts opts) {
+  struct mg_connection *conn;
+
+  if ((conn = (struct mg_connection *) MG_CALLOC(1, sizeof(*conn))) != NULL) {
+    conn->sock = INVALID_SOCKET;
+    conn->handler = callback;
+    conn->mgr = mgr;
+    conn->last_io_time = (time_t) mg_time();
+    conn->iface =
+        (opts.iface != NULL ? opts.iface : mgr->ifaces[MG_MAIN_IFACE]);
+    conn->flags = opts.flags & _MG_ALLOWED_CONNECT_FLAGS_MASK;
+    conn->user_data = opts.user_data;
+    /*
+     * SIZE_MAX is defined as a long long constant in
+     * system headers on some platforms and so it
+     * doesn't compile with pedantic ansi flags.
+     */
+    conn->recv_mbuf_limit = ~0;
+  } else {
+    MG_SET_PTRPTR(opts.error_string, "failed to create connection");
+  }
+
+  return conn;
+}
+
+MG_INTERNAL struct mg_connection *mg_create_connection(
+    struct mg_mgr *mgr, mg_event_handler_t callback,
+    struct mg_add_sock_opts opts) {
+  struct mg_connection *conn = mg_create_connection_base(mgr, callback, opts);
+
+  if (conn != NULL && !conn->iface->vtable->create_conn(conn)) {
+    MG_FREE(conn);
+    conn = NULL;
+  }
+  if (conn == NULL) {
+    MG_SET_PTRPTR(opts.error_string, "failed to init connection");
+  }
+
+  return conn;
+}
+
+/*
+ * Address format: [PROTO://][HOST]:PORT
+ *
+ * HOST could be IPv4/IPv6 address or a host name.
+ * `host` is a destination buffer to hold parsed HOST part. Shoud be at least
+ * MG_MAX_HOST_LEN bytes long.
+ * `proto` is a returned socket type, either SOCK_STREAM or SOCK_DGRAM
+ *
+ * Return:
+ *   -1   on parse error
+ *    0   if HOST needs DNS lookup
+ *   >0   length of the address string
+ */
+MG_INTERNAL int mg_parse_address(const char *str, union socket_address *sa,
+                                 int *proto, char *host, size_t host_len) {
+  unsigned int a, b, c, d, port = 0;
+  int ch, len = 0;
+#if MG_ENABLE_IPV6
+  char buf[100];
+#endif
+
+  /*
+   * MacOS needs that. If we do not zero it, subsequent bind() will fail.
+   * Also, all-zeroes in the socket address means binding to all addresses
+   * for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).
+   */
+  memset(sa, 0, sizeof(*sa));
+  sa->sin.sin_family = AF_INET;
+
+  *proto = SOCK_STREAM;
+
+  if (strncmp(str, "udp://", 6) == 0) {
+    str += 6;
+    *proto = SOCK_DGRAM;
+  } else if (strncmp(str, "tcp://", 6) == 0) {
+    str += 6;
+  }
+
+  if (sscanf(str, "%u.%u.%u.%u:%u%n", &a, &b, &c, &d, &port, &len) == 5) {
+    /* Bind to a specific IPv4 address, e.g. 192.168.1.5:8080 */
+    sa->sin.sin_addr.s_addr =
+        htonl(((uint32_t) a << 24) | ((uint32_t) b << 16) | c << 8 | d);
+    sa->sin.sin_port = htons((uint16_t) port);
+#if MG_ENABLE_IPV6
+  } else if (sscanf(str, "[%99[^]]]:%u%n", buf, &port, &len) == 2 &&
+             inet_pton(AF_INET6, buf, &sa->sin6.sin6_addr)) {
+    /* IPv6 address, e.g. [3ffe:2a00:100:7031::1]:8080 */
+    sa->sin6.sin6_family = AF_INET6;
+    sa->sin.sin_port = htons((uint16_t) port);
+#endif
+#if MG_ENABLE_ASYNC_RESOLVER
+  } else if (strlen(str) < host_len &&
+             sscanf(str, "%[^ :]:%u%n", host, &port, &len) == 2) {
+    sa->sin.sin_port = htons((uint16_t) port);
+    if (mg_resolve_from_hosts_file(host, sa) != 0) {
+      /*
+       * if resolving from hosts file failed and the host
+       * we are trying to resolve is `localhost` - we should
+       * try to resolve it using `gethostbyname` and do not try
+       * to resolve it via DNS server if gethostbyname has failed too
+       */
+      if (mg_ncasecmp(host, "localhost", 9) != 0) {
+        return 0;
+      }
+
+#if MG_ENABLE_SYNC_RESOLVER
+      if (!mg_resolve2(host, &sa->sin.sin_addr)) {
+        return -1;
+      }
+#else
+      return -1;
+#endif
+    }
+#endif
+  } else if (sscanf(str, ":%u%n", &port, &len) == 1 ||
+             sscanf(str, "%u%n", &port, &len) == 1) {
+    /* If only port is specified, bind to IPv4, INADDR_ANY */
+    sa->sin.sin_port = htons((uint16_t) port);
+  } else {
+    return -1;
+  }
+
+  /* Required for MG_ENABLE_ASYNC_RESOLVER=0 */
+  (void) host;
+  (void) host_len;
+
+  ch = str[len]; /* Character that follows the address */
+  return port < 0xffffUL && (ch == '\0' || ch == ',' || isspace(ch)) ? len : -1;
+}
+
+struct mg_connection *mg_if_accept_new_conn(struct mg_connection *lc) {
+  struct mg_add_sock_opts opts;
+  struct mg_connection *nc;
+  memset(&opts, 0, sizeof(opts));
+  nc = mg_create_connection(lc->mgr, lc->handler, opts);
+  if (nc == NULL) return NULL;
+  nc->listener = lc;
+  nc->proto_handler = lc->proto_handler;
+  nc->user_data = lc->user_data;
+  nc->recv_mbuf_limit = lc->recv_mbuf_limit;
+  nc->iface = lc->iface;
+  if (lc->flags & MG_F_SSL) nc->flags |= MG_F_SSL;
+  mg_add_conn(nc->mgr, nc);
+  DBG(("%p %p %d %d", lc, nc, nc->sock, (int) nc->flags));
+  return nc;
+}
+
+void mg_if_accept_tcp_cb(struct mg_connection *nc, union socket_address *sa,
+                         size_t sa_len) {
+  (void) sa_len;
+  nc->sa = *sa;
+  mg_call(nc, NULL, MG_EV_ACCEPT, &nc->sa);
+}
+
+void mg_send(struct mg_connection *nc, const void *buf, int len) {
+  nc->last_io_time = (time_t) mg_time();
+  if (nc->flags & MG_F_UDP) {
+    nc->iface->vtable->udp_send(nc, buf, len);
+  } else {
+    nc->iface->vtable->tcp_send(nc, buf, len);
+  }
+#if !defined(NO_LIBC) && MG_ENABLE_HEXDUMP
+  if (nc->mgr && nc->mgr->hexdump_file != NULL) {
+    mg_hexdump_connection(nc, nc->mgr->hexdump_file, buf, len, MG_EV_SEND);
+  }
+#endif
+}
+
+void mg_if_sent_cb(struct mg_connection *nc, int num_sent) {
+  if (num_sent < 0) {
+    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+  }
+  mg_call(nc, NULL, MG_EV_SEND, &num_sent);
+}
+
+MG_INTERNAL void mg_recv_common(struct mg_connection *nc, void *buf, int len,
+                                int own) {
+  DBG(("%p %d %u", nc, len, (unsigned int) nc->recv_mbuf.len));
+  if (nc->flags & MG_F_CLOSE_IMMEDIATELY) {
+    DBG(("%p discarded %d bytes", nc, len));
+    /*
+     * This connection will not survive next poll. Do not deliver events,
+     * send data to /dev/null without acking.
+     */
+    if (own) {
+      MG_FREE(buf);
+    }
+    return;
+  }
+  nc->last_io_time = (time_t) mg_time();
+  if (!own) {
+    mbuf_append(&nc->recv_mbuf, buf, len);
+  } else if (nc->recv_mbuf.len == 0) {
+    /* Adopt buf as recv_mbuf's backing store. */
+    mbuf_free(&nc->recv_mbuf);
+    nc->recv_mbuf.buf = (char *) buf;
+    nc->recv_mbuf.size = nc->recv_mbuf.len = len;
+  } else {
+    mbuf_append(&nc->recv_mbuf, buf, len);
+    MG_FREE(buf);
+  }
+  mg_call(nc, NULL, MG_EV_RECV, &len);
+}
+
+void mg_if_recv_tcp_cb(struct mg_connection *nc, void *buf, int len, int own) {
+  mg_recv_common(nc, buf, len, own);
+}
+
+void mg_if_recv_udp_cb(struct mg_connection *nc, void *buf, int len,
+                       union socket_address *sa, size_t sa_len) {
+  assert(nc->flags & MG_F_UDP);
+  DBG(("%p %u", nc, (unsigned int) len));
+  if (nc->flags & MG_F_LISTENING) {
+    struct mg_connection *lc = nc;
+    /*
+     * Do we have an existing connection for this source?
+     * This is very inefficient for long connection lists.
+     */
+    for (nc = mg_next(lc->mgr, NULL); nc != NULL; nc = mg_next(lc->mgr, nc)) {
+      if (memcmp(&nc->sa.sa, &sa->sa, sa_len) == 0 && nc->listener == lc) {
+        break;
+      }
+    }
+    if (nc == NULL) {
+      struct mg_add_sock_opts opts;
+      memset(&opts, 0, sizeof(opts));
+      /* Create fake connection w/out sock initialization */
+      nc = mg_create_connection_base(lc->mgr, lc->handler, opts);
+      if (nc != NULL) {
+        nc->sock = lc->sock;
+        nc->listener = lc;
+        nc->sa = *sa;
+        nc->proto_handler = lc->proto_handler;
+        nc->user_data = lc->user_data;
+        nc->recv_mbuf_limit = lc->recv_mbuf_limit;
+        nc->flags = MG_F_UDP;
+        /*
+         * Long-lived UDP "connections" i.e. interactions that involve more
+         * than one request and response are rare, most are transactional:
+         * response is sent and the "connection" is closed. Or - should be.
+         * But users (including ourselves) tend to forget about that part,
+         * because UDP is connectionless and one does not think about
+         * processing a UDP request as handling a connection that needs to be
+         * closed. Thus, we begin with SEND_AND_CLOSE flag set, which should
+         * be a reasonable default for most use cases, but it is possible to
+         * turn it off the connection should be kept alive after processing.
+         */
+        nc->flags |= MG_F_SEND_AND_CLOSE;
+        mg_add_conn(lc->mgr, nc);
+        mg_call(nc, NULL, MG_EV_ACCEPT, &nc->sa);
+      } else {
+        DBG(("OOM"));
+        /* No return here, we still need to drop on the floor */
+      }
+    }
+  }
+  if (nc != NULL) {
+    mg_recv_common(nc, buf, len, 1);
+  } else {
+    /* Drop on the floor. */
+    MG_FREE(buf);
+    nc->iface->vtable->recved(nc, len);
+  }
+}
+
+/*
+ * Schedules an async connect for a resolved address and proto.
+ * Called from two places: `mg_connect_opt()` and from async resolver.
+ * When called from the async resolver, it must trigger `MG_EV_CONNECT` event
+ * with a failure flag to indicate connection failure.
+ */
+MG_INTERNAL struct mg_connection *mg_do_connect(struct mg_connection *nc,
+                                                int proto,
+                                                union socket_address *sa) {
+  DBG(("%p %s://%s:%hu", nc, proto == SOCK_DGRAM ? "udp" : "tcp",
+       inet_ntoa(sa->sin.sin_addr), ntohs(sa->sin.sin_port)));
+
+  nc->flags |= MG_F_CONNECTING;
+  if (proto == SOCK_DGRAM) {
+    nc->iface->vtable->connect_udp(nc);
+  } else {
+    nc->iface->vtable->connect_tcp(nc, sa);
+  }
+  mg_add_conn(nc->mgr, nc);
+  return nc;
+}
+
+void mg_if_connect_cb(struct mg_connection *nc, int err) {
+  DBG(("%p connect, err=%d", nc, err));
+  nc->flags &= ~MG_F_CONNECTING;
+  if (err != 0) {
+    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+  }
+  mg_call(nc, NULL, MG_EV_CONNECT, &err);
+}
+
+#if MG_ENABLE_ASYNC_RESOLVER
+/*
+ * Callback for the async resolver on mg_connect_opt() call.
+ * Main task of this function is to trigger MG_EV_CONNECT event with
+ *    either failure (and dealloc the connection)
+ *    or success (and proceed with connect()
+ */
+static void resolve_cb(struct mg_dns_message *msg, void *data,
+                       enum mg_resolve_err e) {
+  struct mg_connection *nc = (struct mg_connection *) data;
+  int i;
+  int failure = -1;
+
+  nc->flags &= ~MG_F_RESOLVING;
+  if (msg != NULL) {
+    /*
+     * Take the first DNS A answer and run...
+     */
+    for (i = 0; i < msg->num_answers; i++) {
+      if (msg->answers[i].rtype == MG_DNS_A_RECORD) {
+        /*
+         * Async resolver guarantees that there is at least one answer.
+         * TODO(lsm): handle IPv6 answers too
+         */
+        mg_dns_parse_record_data(msg, &msg->answers[i], &nc->sa.sin.sin_addr,
+                                 4);
+        mg_do_connect(nc, nc->flags & MG_F_UDP ? SOCK_DGRAM : SOCK_STREAM,
+                      &nc->sa);
+        return;
+      }
+    }
+  }
+
+  if (e == MG_RESOLVE_TIMEOUT) {
+    double now = mg_time();
+    mg_call(nc, NULL, MG_EV_TIMER, &now);
+  }
+
+  /*
+   * If we get there was no MG_DNS_A_RECORD in the answer
+   */
+  mg_call(nc, NULL, MG_EV_CONNECT, &failure);
+  mg_call(nc, NULL, MG_EV_CLOSE, NULL);
+  mg_destroy_conn(nc, 1 /* destroy_if */);
+}
+#endif
+
+struct mg_connection *mg_connect(struct mg_mgr *mgr, const char *address,
+                                 mg_event_handler_t callback) {
+  struct mg_connect_opts opts;
+  memset(&opts, 0, sizeof(opts));
+  return mg_connect_opt(mgr, address, callback, opts);
+}
+
+struct mg_connection *mg_connect_opt(struct mg_mgr *mgr, const char *address,
+                                     mg_event_handler_t callback,
+                                     struct mg_connect_opts opts) {
+  struct mg_connection *nc = NULL;
+  int proto, rc;
+  struct mg_add_sock_opts add_sock_opts;
+  char host[MG_MAX_HOST_LEN];
+
+  MG_COPY_COMMON_CONNECTION_OPTIONS(&add_sock_opts, &opts);
+
+  if ((nc = mg_create_connection(mgr, callback, add_sock_opts)) == NULL) {
+    return NULL;
+  }
+
+  if ((rc = mg_parse_address(address, &nc->sa, &proto, host, sizeof(host))) <
+      0) {
+    /* Address is malformed */
+    MG_SET_PTRPTR(opts.error_string, "cannot parse address");
+    mg_destroy_conn(nc, 1 /* destroy_if */);
+    return NULL;
+  }
+
+  nc->flags |= opts.flags & _MG_ALLOWED_CONNECT_FLAGS_MASK;
+  nc->flags |= (proto == SOCK_DGRAM) ? MG_F_UDP : 0;
+  nc->user_data = opts.user_data;
+
+#if MG_ENABLE_SSL
+  DBG(("%p %s %s,%s,%s", nc, address, (opts.ssl_cert ? opts.ssl_cert : "-"),
+       (opts.ssl_key ? opts.ssl_key : "-"),
+       (opts.ssl_ca_cert ? opts.ssl_ca_cert : "-")));
+
+  if (opts.ssl_cert != NULL || opts.ssl_ca_cert != NULL ||
+      opts.ssl_psk_identity != NULL) {
+    const char *err_msg = NULL;
+    struct mg_ssl_if_conn_params params;
+    if (nc->flags & MG_F_UDP) {
+      MG_SET_PTRPTR(opts.error_string, "SSL for UDP is not supported");
+      mg_destroy_conn(nc, 1 /* destroy_if */);
+      return NULL;
+    }
+    memset(&params, 0, sizeof(params));
+    params.cert = opts.ssl_cert;
+    params.key = opts.ssl_key;
+    params.ca_cert = opts.ssl_ca_cert;
+    params.cipher_suites = opts.ssl_cipher_suites;
+    params.psk_identity = opts.ssl_psk_identity;
+    params.psk_key = opts.ssl_psk_key;
+    if (opts.ssl_ca_cert != NULL) {
+      if (opts.ssl_server_name != NULL) {
+        if (strcmp(opts.ssl_server_name, "*") != 0) {
+          params.server_name = opts.ssl_server_name;
+        }
+      } else if (rc == 0) { /* If it's a DNS name, use host. */
+        params.server_name = host;
+      }
+    }
+    if (mg_ssl_if_conn_init(nc, &params, &err_msg) != MG_SSL_OK) {
+      MG_SET_PTRPTR(opts.error_string, err_msg);
+      mg_destroy_conn(nc, 1 /* destroy_if */);
+      return NULL;
+    }
+    nc->flags |= MG_F_SSL;
+  }
+#endif /* MG_ENABLE_SSL */
+
+  if (rc == 0) {
+#if MG_ENABLE_ASYNC_RESOLVER
+    /*
+     * DNS resolution is required for host.
+     * mg_parse_address() fills port in nc->sa, which we pass to resolve_cb()
+     */
+    struct mg_connection *dns_conn = NULL;
+    struct mg_resolve_async_opts o;
+    memset(&o, 0, sizeof(o));
+    o.dns_conn = &dns_conn;
+    if (mg_resolve_async_opt(nc->mgr, host, MG_DNS_A_RECORD, resolve_cb, nc,
+                             o) != 0) {
+      MG_SET_PTRPTR(opts.error_string, "cannot schedule DNS lookup");
+      mg_destroy_conn(nc, 1 /* destroy_if */);
+      return NULL;
+    }
+    nc->priv_2 = dns_conn;
+    nc->flags |= MG_F_RESOLVING;
+    return nc;
+#else
+    MG_SET_PTRPTR(opts.error_string, "Resolver is disabled");
+    mg_destroy_conn(nc, 1 /* destroy_if */);
+    return NULL;
+#endif
+  } else {
+    /* Address is parsed and resolved to IP. proceed with connect() */
+    return mg_do_connect(nc, proto, &nc->sa);
+  }
+}
+
+struct mg_connection *mg_bind(struct mg_mgr *srv, const char *address,
+                              mg_event_handler_t event_handler) {
+  struct mg_bind_opts opts;
+  memset(&opts, 0, sizeof(opts));
+  return mg_bind_opt(srv, address, event_handler, opts);
+}
+
+struct mg_connection *mg_bind_opt(struct mg_mgr *mgr, const char *address,
+                                  mg_event_handler_t callback,
+                                  struct mg_bind_opts opts) {
+  union socket_address sa;
+  struct mg_connection *nc = NULL;
+  int proto, rc;
+  struct mg_add_sock_opts add_sock_opts;
+  char host[MG_MAX_HOST_LEN];
+
+  MG_COPY_COMMON_CONNECTION_OPTIONS(&add_sock_opts, &opts);
+
+#if MG_ENABLE_TUN
+  if (mg_strncmp(mg_mk_str(address), mg_mk_str("ws://"), 5) == 0 ||
+      mg_strncmp(mg_mk_str(address), mg_mk_str("wss://"), 6) == 0) {
+    return mg_tun_bind_opt(mgr, address, callback, opts);
+  }
+#endif
+
+  if (mg_parse_address(address, &sa, &proto, host, sizeof(host)) <= 0) {
+    MG_SET_PTRPTR(opts.error_string, "cannot parse address");
+    return NULL;
+  }
+
+  nc = mg_create_connection(mgr, callback, add_sock_opts);
+  if (nc == NULL) {
+    return NULL;
+  }
+
+  nc->sa = sa;
+  nc->flags |= MG_F_LISTENING;
+  if (proto == SOCK_DGRAM) nc->flags |= MG_F_UDP;
+
+#if MG_ENABLE_SSL
+  DBG(("%p %s %s,%s,%s", nc, address, (opts.ssl_cert ? opts.ssl_cert : "-"),
+       (opts.ssl_key ? opts.ssl_key : "-"),
+       (opts.ssl_ca_cert ? opts.ssl_ca_cert : "-")));
+
+  if (opts.ssl_cert != NULL || opts.ssl_ca_cert != NULL) {
+    const char *err_msg = NULL;
+    struct mg_ssl_if_conn_params params;
+    if (nc->flags & MG_F_UDP) {
+      MG_SET_PTRPTR(opts.error_string, "SSL for UDP is not supported");
+      mg_destroy_conn(nc, 1 /* destroy_if */);
+      return NULL;
+    }
+    memset(&params, 0, sizeof(params));
+    params.cert = opts.ssl_cert;
+    params.key = opts.ssl_key;
+    params.ca_cert = opts.ssl_ca_cert;
+    params.cipher_suites = opts.ssl_cipher_suites;
+    if (mg_ssl_if_conn_init(nc, &params, &err_msg) != MG_SSL_OK) {
+      MG_SET_PTRPTR(opts.error_string, err_msg);
+      mg_destroy_conn(nc, 1 /* destroy_if */);
+      return NULL;
+    }
+    nc->flags |= MG_F_SSL;
+  }
+#endif /* MG_ENABLE_SSL */
+
+  if (nc->flags & MG_F_UDP) {
+    rc = nc->iface->vtable->listen_udp(nc, &nc->sa);
+  } else {
+    rc = nc->iface->vtable->listen_tcp(nc, &nc->sa);
+  }
+  if (rc != 0) {
+    DBG(("Failed to open listener: %d", rc));
+    MG_SET_PTRPTR(opts.error_string, "failed to open listener");
+    mg_destroy_conn(nc, 1 /* destroy_if */);
+    return NULL;
+  }
+  mg_add_conn(nc->mgr, nc);
+
+  return nc;
+}
+
+struct mg_connection *mg_next(struct mg_mgr *s, struct mg_connection *conn) {
+  return conn == NULL ? s->active_connections : conn->next;
+}
+
+#if MG_ENABLE_BROADCAST
+void mg_broadcast(struct mg_mgr *mgr, mg_event_handler_t cb, void *data,
+                  size_t len) {
+  struct ctl_msg ctl_msg;
+
+  /*
+   * Mongoose manager has a socketpair, `struct mg_mgr::ctl`,
+   * where `mg_broadcast()` pushes the message.
+   * `mg_mgr_poll()` wakes up, reads a message from the socket pair, and calls
+   * specified callback for each connection. Thus the callback function executes
+   * in event manager thread.
+   */
+  if (mgr->ctl[0] != INVALID_SOCKET && data != NULL &&
+      len < sizeof(ctl_msg.message)) {
+    size_t dummy;
+
+    ctl_msg.callback = cb;
+    memcpy(ctl_msg.message, data, len);
+    dummy = MG_SEND_FUNC(mgr->ctl[0], (char *) &ctl_msg,
+                         offsetof(struct ctl_msg, message) + len, 0);
+    dummy = MG_RECV_FUNC(mgr->ctl[0], (char *) &len, 1, 0);
+    (void) dummy; /* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25509 */
+  }
+}
+#endif /* MG_ENABLE_BROADCAST */
+
+static int isbyte(int n) {
+  return n >= 0 && n <= 255;
+}
+
+static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
+  int n, a, b, c, d, slash = 32, len = 0;
+
+  if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
+       sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
+      isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) && slash >= 0 &&
+      slash < 33) {
+    len = n;
+    *net =
+        ((uint32_t) a << 24) | ((uint32_t) b << 16) | ((uint32_t) c << 8) | d;
+    *mask = slash ? 0xffffffffU << (32 - slash) : 0;
+  }
+
+  return len;
+}
+
+int mg_check_ip_acl(const char *acl, uint32_t remote_ip) {
+  int allowed, flag;
+  uint32_t net, mask;
+  struct mg_str vec;
+
+  /* If any ACL is set, deny by default */
+  allowed = (acl == NULL || *acl == '\0') ? '+' : '-';
+
+  while ((acl = mg_next_comma_list_entry(acl, &vec, NULL)) != NULL) {
+    flag = vec.p[0];
+    if ((flag != '+' && flag != '-') ||
+        parse_net(&vec.p[1], &net, &mask) == 0) {
+      return -1;
+    }
+
+    if (net == (remote_ip & mask)) {
+      allowed = flag;
+    }
+  }
+
+  DBG(("%08x %c", remote_ip, allowed));
+  return allowed == '+';
+}
+
+/* Move data from one connection to another */
+void mg_forward(struct mg_connection *from, struct mg_connection *to) {
+  mg_send(to, from->recv_mbuf.buf, from->recv_mbuf.len);
+  mbuf_remove(&from->recv_mbuf, from->recv_mbuf.len);
+}
+
+double mg_set_timer(struct mg_connection *c, double timestamp) {
+  double result = c->ev_timer_time;
+  c->ev_timer_time = timestamp;
+  /*
+   * If this connection is resolving, it's not in the list of active
+   * connections, so not processed yet. It has a DNS resolver connection
+   * linked to it. Set up a timer for the DNS connection.
+   */
+  DBG(("%p %p %d -> %lu", c, c->priv_2, c->flags & MG_F_RESOLVING,
+       (unsigned long) timestamp));
+  if ((c->flags & MG_F_RESOLVING) && c->priv_2 != NULL) {
+    ((struct mg_connection *) c->priv_2)->ev_timer_time = timestamp;
+  }
+  return result;
+}
+
+void mg_sock_set(struct mg_connection *nc, sock_t sock) {
+  if (sock != INVALID_SOCKET) {
+    nc->iface->vtable->sock_set(nc, sock);
+  }
+}
+
+void mg_if_get_conn_addr(struct mg_connection *nc, int remote,
+                         union socket_address *sa) {
+  nc->iface->vtable->get_conn_addr(nc, remote, sa);
+}
+
+struct mg_connection *mg_add_sock_opt(struct mg_mgr *s, sock_t sock,
+                                      mg_event_handler_t callback,
+                                      struct mg_add_sock_opts opts) {
+  struct mg_connection *nc = mg_create_connection_base(s, callback, opts);
+  if (nc != NULL) {
+    mg_sock_set(nc, sock);
+    mg_add_conn(nc->mgr, nc);
+  }
+  return nc;
+}
+
+struct mg_connection *mg_add_sock(struct mg_mgr *s, sock_t sock,
+                                  mg_event_handler_t callback) {
+  struct mg_add_sock_opts opts;
+  memset(&opts, 0, sizeof(opts));
+  return mg_add_sock_opt(s, sock, callback, opts);
+}
+
+double mg_time(void) {
+  return cs_time();
+}
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/net_if_socket.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_MONGOOSE_SRC_NET_IF_SOCKET_H_
+#define CS_MONGOOSE_SRC_NET_IF_SOCKET_H_
+
+/* Amalgamated: #include "mongoose/src/net_if.h" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#ifndef MG_ENABLE_NET_IF_SOCKET
+#define MG_ENABLE_NET_IF_SOCKET MG_NET_IF == MG_NET_IF_SOCKET
+#endif
+
+extern struct mg_iface_vtable mg_socket_iface_vtable;
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* CS_MONGOOSE_SRC_NET_IF_SOCKET_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/net_if_tun.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_MONGOOSE_SRC_NET_IF_TUN_H_
+#define CS_MONGOOSE_SRC_NET_IF_TUN_H_
+
+#if MG_ENABLE_TUN
+
+/* Amalgamated: #include "mongoose/src/net_if.h" */
+
+struct mg_tun_client;
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+extern struct mg_iface_vtable mg_tun_iface_vtable;
+
+struct mg_connection *mg_tun_if_find_conn(struct mg_tun_client *client,
+                                          uint32_t stream_id);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* MG_ENABLE_TUN */
+
+#endif /* CS_MONGOOSE_SRC_NET_IF_TUN_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/net_if.c"
+#endif
+/* Amalgamated: #include "mongoose/src/net_if.h" */
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/net_if_socket.h" */
+/* Amalgamated: #include "mongoose/src/net_if_tun.h" */
+
+extern struct mg_iface_vtable mg_default_iface_vtable;
+
+#if MG_ENABLE_TUN
+struct mg_iface_vtable *mg_ifaces[] = {&mg_default_iface_vtable,
+                                       &mg_tun_iface_vtable};
+#else
+struct mg_iface_vtable *mg_ifaces[] = {&mg_default_iface_vtable};
+#endif
+
+int mg_num_ifaces = (int) (sizeof(mg_ifaces) / sizeof(mg_ifaces[0]));
+
+struct mg_iface *mg_if_create_iface(struct mg_iface_vtable *vtable,
+                                    struct mg_mgr *mgr) {
+  struct mg_iface *iface = (struct mg_iface *) MG_CALLOC(1, sizeof(*iface));
+  iface->mgr = mgr;
+  iface->data = NULL;
+  iface->vtable = vtable;
+  return iface;
+}
+
+struct mg_iface *mg_find_iface(struct mg_mgr *mgr,
+                               struct mg_iface_vtable *vtable,
+                               struct mg_iface *from) {
+  int i = 0;
+  if (from != NULL) {
+    for (i = 0; i < mgr->num_ifaces; i++) {
+      if (mgr->ifaces[i] == from) {
+        i++;
+        break;
+      }
+    }
+  }
+
+  for (; i < mgr->num_ifaces; i++) {
+    if (mgr->ifaces[i]->vtable == vtable) {
+      return mgr->ifaces[i];
+    }
+  }
+  return NULL;
+}
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/net_if_socket.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_NET_IF_SOCKET
+
+/* Amalgamated: #include "mongoose/src/net_if_socket.h" */
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/util.h" */
+
+#define MG_TCP_RECV_BUFFER_SIZE 1024
+#define MG_UDP_RECV_BUFFER_SIZE 1500
+
+static sock_t mg_open_listening_socket(union socket_address *sa, int type,
+                                       int proto);
+#if MG_ENABLE_SSL
+static void mg_ssl_begin(struct mg_connection *nc);
+#endif
+
+void mg_set_non_blocking_mode(sock_t sock) {
+#ifdef _WIN32
+  unsigned long on = 1;
+  ioctlsocket(sock, FIONBIO, &on);
+#else
+  int flags = fcntl(sock, F_GETFL, 0);
+  fcntl(sock, F_SETFL, flags | O_NONBLOCK);
+#endif
+}
+
+static int mg_is_error(int n) {
+  int err = mg_get_errno();
+  return (n < 0 && err != EINPROGRESS && err != EWOULDBLOCK
+#ifndef WINCE
+          && err != EAGAIN && err != EINTR
+#endif
+#ifdef _WIN32
+          && WSAGetLastError() != WSAEINTR &&
+          WSAGetLastError() != WSAEWOULDBLOCK
+#endif
+          );
+}
+
+void mg_socket_if_connect_tcp(struct mg_connection *nc,
+                              const union socket_address *sa) {
+  int rc, proto = 0;
+  nc->sock = socket(AF_INET, SOCK_STREAM, proto);
+  if (nc->sock == INVALID_SOCKET) {
+    nc->err = mg_get_errno() ? mg_get_errno() : 1;
+    return;
+  }
+#if !defined(MG_ESP8266)
+  mg_set_non_blocking_mode(nc->sock);
+#endif
+  rc = connect(nc->sock, &sa->sa, sizeof(sa->sin));
+  nc->err = mg_is_error(rc) ? mg_get_errno() : 0;
+  DBG(("%p sock %d rc %d errno %d err %d", nc, nc->sock, rc, mg_get_errno(),
+       nc->err));
+}
+
+void mg_socket_if_connect_udp(struct mg_connection *nc) {
+  nc->sock = socket(AF_INET, SOCK_DGRAM, 0);
+  if (nc->sock == INVALID_SOCKET) {
+    nc->err = mg_get_errno() ? mg_get_errno() : 1;
+    return;
+  }
+  if (nc->flags & MG_F_ENABLE_BROADCAST) {
+    int optval = 1;
+    setsockopt(nc->sock, SOL_SOCKET, SO_BROADCAST, (const char *) &optval,
+               sizeof(optval));
+  }
+  nc->err = 0;
+}
+
+int mg_socket_if_listen_tcp(struct mg_connection *nc,
+                            union socket_address *sa) {
+  int proto = 0;
+  sock_t sock = mg_open_listening_socket(sa, SOCK_STREAM, proto);
+  if (sock == INVALID_SOCKET) {
+    return (mg_get_errno() ? mg_get_errno() : 1);
+  }
+  mg_sock_set(nc, sock);
+  return 0;
+}
+
+int mg_socket_if_listen_udp(struct mg_connection *nc,
+                            union socket_address *sa) {
+  sock_t sock = mg_open_listening_socket(sa, SOCK_DGRAM, 0);
+  if (sock == INVALID_SOCKET) return (mg_get_errno() ? mg_get_errno() : 1);
+  mg_sock_set(nc, sock);
+  return 0;
+}
+
+void mg_socket_if_tcp_send(struct mg_connection *nc, const void *buf,
+                           size_t len) {
+  mbuf_append(&nc->send_mbuf, buf, len);
+}
+
+void mg_socket_if_udp_send(struct mg_connection *nc, const void *buf,
+                           size_t len) {
+  mbuf_append(&nc->send_mbuf, buf, len);
+}
+
+void mg_socket_if_recved(struct mg_connection *nc, size_t len) {
+  (void) nc;
+  (void) len;
+}
+
+int mg_socket_if_create_conn(struct mg_connection *nc) {
+  (void) nc;
+  return 1;
+}
+
+void mg_socket_if_destroy_conn(struct mg_connection *nc) {
+  if (nc->sock == INVALID_SOCKET) return;
+  if (!(nc->flags & MG_F_UDP)) {
+    closesocket(nc->sock);
+  } else {
+    /* Only close outgoing UDP sockets or listeners. */
+    if (nc->listener == NULL) closesocket(nc->sock);
+  }
+  nc->sock = INVALID_SOCKET;
+}
+
+static int mg_accept_conn(struct mg_connection *lc) {
+  struct mg_connection *nc;
+  union socket_address sa;
+  socklen_t sa_len = sizeof(sa);
+  /* NOTE(lsm): on Windows, sock is always > FD_SETSIZE */
+  sock_t sock = accept(lc->sock, &sa.sa, &sa_len);
+  if (sock == INVALID_SOCKET) {
+    if (mg_is_error(-1)) DBG(("%p: failed to accept: %d", lc, mg_get_errno()));
+    return 0;
+  }
+  nc = mg_if_accept_new_conn(lc);
+  if (nc == NULL) {
+    closesocket(sock);
+    return 0;
+  }
+  DBG(("%p conn from %s:%d", nc, inet_ntoa(sa.sin.sin_addr),
+       ntohs(sa.sin.sin_port)));
+  mg_sock_set(nc, sock);
+#if MG_ENABLE_SSL
+  if (lc->flags & MG_F_SSL) {
+    if (mg_ssl_if_conn_accept(nc, lc) != MG_SSL_OK) mg_close_conn(nc);
+  } else
+#endif
+  {
+    mg_if_accept_tcp_cb(nc, &sa, sa_len);
+  }
+  return 1;
+}
+
+/* 'sa' must be an initialized address to bind to */
+static sock_t mg_open_listening_socket(union socket_address *sa, int type,
+                                       int proto) {
+  socklen_t sa_len =
+      (sa->sa.sa_family == AF_INET) ? sizeof(sa->sin) : sizeof(sa->sin6);
+  sock_t sock = INVALID_SOCKET;
+#if !MG_LWIP
+  int on = 1;
+#endif
+
+  if ((sock = socket(sa->sa.sa_family, type, proto)) != INVALID_SOCKET &&
+#if !MG_LWIP /* LWIP doesn't support either */
+#if defined(_WIN32) && defined(SO_EXCLUSIVEADDRUSE) && !defined(WINCE)
+      /* "Using SO_REUSEADDR and SO_EXCLUSIVEADDRUSE" http://goo.gl/RmrFTm */
+      !setsockopt(sock, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (void *) &on,
+                  sizeof(on)) &&
+#endif
+
+#if !defined(_WIN32) || !defined(SO_EXCLUSIVEADDRUSE)
+      /*
+       * SO_RESUSEADDR is not enabled on Windows because the semantics of
+       * SO_REUSEADDR on UNIX and Windows is different. On Windows,
+       * SO_REUSEADDR allows to bind a socket to a port without error even if
+       * the port is already open by another program. This is not the behavior
+       * SO_REUSEADDR was designed for, and leads to hard-to-track failure
+       * scenarios. Therefore, SO_REUSEADDR was disabled on Windows unless
+       * SO_EXCLUSIVEADDRUSE is supported and set on a socket.
+       */
+      !setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &on, sizeof(on)) &&
+#endif
+#endif /* !MG_LWIP */
+
+      !bind(sock, &sa->sa, sa_len) &&
+      (type == SOCK_DGRAM || listen(sock, SOMAXCONN) == 0)) {
+#if !MG_LWIP
+    mg_set_non_blocking_mode(sock);
+    /* In case port was set to 0, get the real port number */
+    (void) getsockname(sock, &sa->sa, &sa_len);
+#endif
+  } else if (sock != INVALID_SOCKET) {
+    closesocket(sock);
+    sock = INVALID_SOCKET;
+  }
+
+  return sock;
+}
+
+static void mg_write_to_socket(struct mg_connection *nc) {
+  struct mbuf *io = &nc->send_mbuf;
+  int n = 0;
+
+#if MG_LWIP
+  /* With LWIP we don't know if the socket is ready */
+  if (io->len == 0) return;
+#endif
+
+  assert(io->len > 0);
+
+  if (nc->flags & MG_F_UDP) {
+    int n =
+        sendto(nc->sock, io->buf, io->len, 0, &nc->sa.sa, sizeof(nc->sa.sin));
+    DBG(("%p %d %d %d %s:%hu", nc, nc->sock, n, mg_get_errno(),
+         inet_ntoa(nc->sa.sin.sin_addr), ntohs(nc->sa.sin.sin_port)));
+    if (n > 0) {
+      mbuf_remove(io, n);
+      mg_if_sent_cb(nc, n);
+    }
+    return;
+  }
+
+#if MG_ENABLE_SSL
+  if (nc->flags & MG_F_SSL) {
+    if (nc->flags & MG_F_SSL_HANDSHAKE_DONE) {
+      n = mg_ssl_if_write(nc, io->buf, io->len);
+      DBG(("%p %d bytes -> %d (SSL)", nc, n, nc->sock));
+      if (n < 0) {
+        if (n != MG_SSL_WANT_READ && n != MG_SSL_WANT_WRITE) {
+          nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+        }
+        return;
+      } else {
+        /* Successful SSL operation, clear off SSL wait flags */
+        nc->flags &= ~(MG_F_WANT_READ | MG_F_WANT_WRITE);
+      }
+    } else {
+      mg_ssl_begin(nc);
+      return;
+    }
+  } else
+#endif
+  {
+    n = (int) MG_SEND_FUNC(nc->sock, io->buf, io->len, 0);
+    DBG(("%p %d bytes -> %d", nc, n, nc->sock));
+    if (n < 0 && mg_is_error(n)) {
+      /* Something went wrong, drop the connection. */
+      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+      return;
+    }
+  }
+
+  if (n > 0) {
+    mbuf_remove(io, n);
+    mg_if_sent_cb(nc, n);
+  }
+}
+
+MG_INTERNAL size_t recv_avail_size(struct mg_connection *conn, size_t max) {
+  size_t avail;
+  if (conn->recv_mbuf_limit < conn->recv_mbuf.len) return 0;
+  avail = conn->recv_mbuf_limit - conn->recv_mbuf.len;
+  return avail > max ? max : avail;
+}
+
+static void mg_handle_tcp_read(struct mg_connection *conn) {
+  int n = 0;
+  char *buf = (char *) MG_MALLOC(MG_TCP_RECV_BUFFER_SIZE);
+
+  if (buf == NULL) {
+    DBG(("OOM"));
+    return;
+  }
+
+#if MG_ENABLE_SSL
+  if (conn->flags & MG_F_SSL) {
+    if (conn->flags & MG_F_SSL_HANDSHAKE_DONE) {
+      /* SSL library may have more bytes ready to read than we ask to read.
+       * Therefore, read in a loop until we read everything. Without the loop,
+       * we skip to the next select() cycle which can just timeout. */
+      while ((n = mg_ssl_if_read(conn, buf, MG_TCP_RECV_BUFFER_SIZE)) > 0) {
+        DBG(("%p %d bytes <- %d (SSL)", conn, n, conn->sock));
+        mg_if_recv_tcp_cb(conn, buf, n, 1 /* own */);
+        buf = NULL;
+        if (conn->flags & MG_F_CLOSE_IMMEDIATELY) break;
+        /* buf has been freed, we need a new one. */
+        buf = (char *) MG_MALLOC(MG_TCP_RECV_BUFFER_SIZE);
+        if (buf == NULL) break;
+      }
+      MG_FREE(buf);
+      if (n < 0 && n != MG_SSL_WANT_READ) conn->flags |= MG_F_CLOSE_IMMEDIATELY;
+    } else {
+      MG_FREE(buf);
+      mg_ssl_begin(conn);
+      return;
+    }
+  } else
+#endif
+  {
+    n = (int) MG_RECV_FUNC(conn->sock, buf,
+                           recv_avail_size(conn, MG_TCP_RECV_BUFFER_SIZE), 0);
+    DBG(("%p %d bytes (PLAIN) <- %d", conn, n, conn->sock));
+    if (n > 0) {
+      mg_if_recv_tcp_cb(conn, buf, n, 1 /* own */);
+    } else {
+      MG_FREE(buf);
+    }
+    if (n == 0) {
+      /* Orderly shutdown of the socket, try flushing output. */
+      conn->flags |= MG_F_SEND_AND_CLOSE;
+    } else if (mg_is_error(n)) {
+      conn->flags |= MG_F_CLOSE_IMMEDIATELY;
+    }
+  }
+}
+
+static int mg_recvfrom(struct mg_connection *nc, union socket_address *sa,
+                       socklen_t *sa_len, char **buf) {
+  int n;
+  *buf = (char *) MG_MALLOC(MG_UDP_RECV_BUFFER_SIZE);
+  if (*buf == NULL) {
+    DBG(("Out of memory"));
+    return -ENOMEM;
+  }
+  n = recvfrom(nc->sock, *buf, MG_UDP_RECV_BUFFER_SIZE, 0, &sa->sa, sa_len);
+  if (n <= 0) {
+    DBG(("%p recvfrom: %s", nc, strerror(mg_get_errno())));
+    MG_FREE(*buf);
+  }
+  return n;
+}
+
+static void mg_handle_udp_read(struct mg_connection *nc) {
+  char *buf = NULL;
+  union socket_address sa;
+  socklen_t sa_len = sizeof(sa);
+  int n = mg_recvfrom(nc, &sa, &sa_len, &buf);
+  DBG(("%p %d bytes from %s:%d", nc, n, inet_ntoa(nc->sa.sin.sin_addr),
+       ntohs(nc->sa.sin.sin_port)));
+  mg_if_recv_udp_cb(nc, buf, n, &sa, sa_len);
+}
+
+#if MG_ENABLE_SSL
+static void mg_ssl_begin(struct mg_connection *nc) {
+  int server_side = (nc->listener != NULL);
+  enum mg_ssl_if_result res = mg_ssl_if_handshake(nc);
+  DBG(("%p %d res %d", nc, server_side, res));
+
+  if (res == MG_SSL_OK) {
+    nc->flags |= MG_F_SSL_HANDSHAKE_DONE;
+    nc->flags &= ~(MG_F_WANT_READ | MG_F_WANT_WRITE);
+
+    if (server_side) {
+      union socket_address sa;
+      socklen_t sa_len = sizeof(sa);
+      (void) getpeername(nc->sock, &sa.sa, &sa_len);
+      mg_if_accept_tcp_cb(nc, &sa, sa_len);
+    } else {
+      mg_if_connect_cb(nc, 0);
+    }
+  } else if (res != MG_SSL_WANT_READ && res != MG_SSL_WANT_WRITE) {
+    if (!server_side) {
+      mg_if_connect_cb(nc, res);
+    }
+    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+  }
+}
+#endif /* MG_ENABLE_SSL */
+
+#define _MG_F_FD_CAN_READ 1
+#define _MG_F_FD_CAN_WRITE 1 << 1
+#define _MG_F_FD_ERROR 1 << 2
+
+void mg_mgr_handle_conn(struct mg_connection *nc, int fd_flags, double now) {
+  int worth_logging =
+      fd_flags != 0 || (nc->flags & (MG_F_WANT_READ | MG_F_WANT_WRITE));
+  if (worth_logging) {
+    DBG(("%p fd=%d fd_flags=%d nc_flags=%lu rmbl=%d smbl=%d", nc, nc->sock,
+         fd_flags, nc->flags, (int) nc->recv_mbuf.len,
+         (int) nc->send_mbuf.len));
+  }
+
+  if (nc->flags & MG_F_CONNECTING) {
+    if (fd_flags != 0) {
+      int err = 0;
+#if !defined(MG_ESP8266)
+      if (!(nc->flags & MG_F_UDP)) {
+        socklen_t len = sizeof(err);
+        int ret =
+            getsockopt(nc->sock, SOL_SOCKET, SO_ERROR, (char *) &err, &len);
+        if (ret != 0) {
+          err = 1;
+        } else if (err == EAGAIN || err == EWOULDBLOCK) {
+          err = 0;
+        }
+      }
+#else
+      /*
+       * On ESP8266 we use blocking connect.
+       */
+      err = nc->err;
+#endif
+#if MG_ENABLE_SSL
+      if ((nc->flags & MG_F_SSL) && err == 0) {
+        mg_ssl_begin(nc);
+      } else {
+        mg_if_connect_cb(nc, err);
+      }
+#else
+      mg_if_connect_cb(nc, err);
+#endif
+    } else if (nc->err != 0) {
+      mg_if_connect_cb(nc, nc->err);
+    }
+  }
+
+  if (fd_flags & _MG_F_FD_CAN_READ) {
+    if (nc->flags & MG_F_UDP) {
+      mg_handle_udp_read(nc);
+    } else {
+      if (nc->flags & MG_F_LISTENING) {
+        /*
+         * We're not looping here, and accepting just one connection at
+         * a time. The reason is that eCos does not respect non-blocking
+         * flag on a listening socket and hangs in a loop.
+         */
+        mg_accept_conn(nc);
+      } else {
+        mg_handle_tcp_read(nc);
+      }
+    }
+  }
+
+  if (!(nc->flags & MG_F_CLOSE_IMMEDIATELY)) {
+    if ((fd_flags & _MG_F_FD_CAN_WRITE) && nc->send_mbuf.len > 0) {
+      mg_write_to_socket(nc);
+    }
+    mg_if_poll(nc, (time_t) now);
+    mg_if_timer(nc, now);
+  }
+
+  if (worth_logging) {
+    DBG(("%p after fd=%d nc_flags=%lu rmbl=%d smbl=%d", nc, nc->sock, nc->flags,
+         (int) nc->recv_mbuf.len, (int) nc->send_mbuf.len));
+  }
+}
+
+#if MG_ENABLE_BROADCAST
+static void mg_mgr_handle_ctl_sock(struct mg_mgr *mgr) {
+  struct ctl_msg ctl_msg;
+  int len =
+      (int) MG_RECV_FUNC(mgr->ctl[1], (char *) &ctl_msg, sizeof(ctl_msg), 0);
+  size_t dummy = MG_SEND_FUNC(mgr->ctl[1], ctl_msg.message, 1, 0);
+  DBG(("read %d from ctl socket", len));
+  (void) dummy; /* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25509 */
+  if (len >= (int) sizeof(ctl_msg.callback) && ctl_msg.callback != NULL) {
+    struct mg_connection *nc;
+    for (nc = mg_next(mgr, NULL); nc != NULL; nc = mg_next(mgr, nc)) {
+      ctl_msg.callback(nc, MG_EV_POLL, ctl_msg.message);
+    }
+  }
+}
+#endif
+
+/* Associate a socket to a connection. */
+void mg_socket_if_sock_set(struct mg_connection *nc, sock_t sock) {
+  mg_set_non_blocking_mode(sock);
+  mg_set_close_on_exec(sock);
+  nc->sock = sock;
+  DBG(("%p %d", nc, sock));
+}
+
+void mg_socket_if_init(struct mg_iface *iface) {
+  (void) iface;
+  DBG(("%p using select()", iface->mgr));
+#if MG_ENABLE_BROADCAST
+  do {
+    mg_socketpair(iface->mgr->ctl, SOCK_DGRAM);
+  } while (iface->mgr->ctl[0] == INVALID_SOCKET);
+#endif
+}
+
+void mg_socket_if_free(struct mg_iface *iface) {
+  (void) iface;
+}
+
+void mg_socket_if_add_conn(struct mg_connection *nc) {
+  (void) nc;
+}
+
+void mg_socket_if_remove_conn(struct mg_connection *nc) {
+  (void) nc;
+}
+
+void mg_add_to_set(sock_t sock, fd_set *set, sock_t *max_fd) {
+  if (sock != INVALID_SOCKET
+#ifdef __unix__
+      && sock < (sock_t) FD_SETSIZE
+#endif
+      ) {
+    FD_SET(sock, set);
+    if (*max_fd == INVALID_SOCKET || sock > *max_fd) {
+      *max_fd = sock;
+    }
+  }
+}
+
+time_t mg_socket_if_poll(struct mg_iface *iface, int timeout_ms) {
+  struct mg_mgr *mgr = iface->mgr;
+  double now = mg_time();
+  double min_timer;
+  struct mg_connection *nc, *tmp;
+  struct timeval tv;
+  fd_set read_set, write_set, err_set;
+  sock_t max_fd = INVALID_SOCKET;
+  int num_fds, num_ev, num_timers = 0;
+#ifdef __unix__
+  int try_dup = 1;
+#endif
+
+  FD_ZERO(&read_set);
+  FD_ZERO(&write_set);
+  FD_ZERO(&err_set);
+#if MG_ENABLE_BROADCAST
+  mg_add_to_set(mgr->ctl[1], &read_set, &max_fd);
+#endif
+
+  /*
+   * Note: it is ok to have connections with sock == INVALID_SOCKET in the list,
+   * e.g. timer-only "connections".
+   */
+  min_timer = 0;
+  for (nc = mgr->active_connections, num_fds = 0; nc != NULL; nc = tmp) {
+    tmp = nc->next;
+
+    if (nc->sock != INVALID_SOCKET) {
+      num_fds++;
+
+#ifdef __unix__
+      /* A hack to make sure all our file descriptos fit into FD_SETSIZE. */
+      if (nc->sock >= (sock_t) FD_SETSIZE && try_dup) {
+        int new_sock = dup(nc->sock);
+        if (new_sock >= 0 && new_sock < (sock_t) FD_SETSIZE) {
+          closesocket(nc->sock);
+          DBG(("new sock %d -> %d", nc->sock, new_sock));
+          nc->sock = new_sock;
+        } else {
+          try_dup = 0;
+        }
+      }
+#endif
+
+      if (!(nc->flags & MG_F_WANT_WRITE) &&
+          nc->recv_mbuf.len < nc->recv_mbuf_limit &&
+          (!(nc->flags & MG_F_UDP) || nc->listener == NULL)) {
+        mg_add_to_set(nc->sock, &read_set, &max_fd);
+      }
+
+      if (((nc->flags & MG_F_CONNECTING) && !(nc->flags & MG_F_WANT_READ)) ||
+          (nc->send_mbuf.len > 0 && !(nc->flags & MG_F_CONNECTING))) {
+        mg_add_to_set(nc->sock, &write_set, &max_fd);
+        mg_add_to_set(nc->sock, &err_set, &max_fd);
+      }
+    }
+
+    if (nc->ev_timer_time > 0) {
+      if (num_timers == 0 || nc->ev_timer_time < min_timer) {
+        min_timer = nc->ev_timer_time;
+      }
+      num_timers++;
+    }
+  }
+
+  /*
+   * If there is a timer to be fired earlier than the requested timeout,
+   * adjust the timeout.
+   */
+  if (num_timers > 0) {
+    double timer_timeout_ms = (min_timer - mg_time()) * 1000 + 1 /* rounding */;
+    if (timer_timeout_ms < timeout_ms) {
+      timeout_ms = (int) timer_timeout_ms;
+    }
+  }
+  if (timeout_ms < 0) timeout_ms = 0;
+
+  tv.tv_sec = timeout_ms / 1000;
+  tv.tv_usec = (timeout_ms % 1000) * 1000;
+
+  num_ev = select((int) max_fd + 1, &read_set, &write_set, &err_set, &tv);
+  now = mg_time();
+#if 0
+  DBG(("select @ %ld num_ev=%d of %d, timeout=%d", (long) now, num_ev, num_fds,
+       timeout_ms));
+#endif
+
+#if MG_ENABLE_BROADCAST
+  if (num_ev > 0 && mgr->ctl[1] != INVALID_SOCKET &&
+      FD_ISSET(mgr->ctl[1], &read_set)) {
+    mg_mgr_handle_ctl_sock(mgr);
+  }
+#endif
+
+  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
+    int fd_flags = 0;
+    if (nc->sock != INVALID_SOCKET) {
+      if (num_ev > 0) {
+        fd_flags = (FD_ISSET(nc->sock, &read_set) &&
+                            (!(nc->flags & MG_F_UDP) || nc->listener == NULL)
+                        ? _MG_F_FD_CAN_READ
+                        : 0) |
+                   (FD_ISSET(nc->sock, &write_set) ? _MG_F_FD_CAN_WRITE : 0) |
+                   (FD_ISSET(nc->sock, &err_set) ? _MG_F_FD_ERROR : 0);
+      }
+#if MG_LWIP
+      /* With LWIP socket emulation layer, we don't get write events for UDP */
+      if ((nc->flags & MG_F_UDP) && nc->listener == NULL) {
+        fd_flags |= _MG_F_FD_CAN_WRITE;
+      }
+#endif
+    }
+    tmp = nc->next;
+    mg_mgr_handle_conn(nc, fd_flags, now);
+  }
+
+  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
+    tmp = nc->next;
+    if ((nc->flags & MG_F_CLOSE_IMMEDIATELY) ||
+        (nc->send_mbuf.len == 0 && (nc->flags & MG_F_SEND_AND_CLOSE))) {
+      mg_close_conn(nc);
+    }
+  }
+
+  return (time_t) now;
+}
+
+#if MG_ENABLE_BROADCAST
+int mg_socketpair(sock_t sp[2], int sock_type) {
+  union socket_address sa;
+  sock_t sock;
+  socklen_t len = sizeof(sa.sin);
+  int ret = 0;
+
+  sock = sp[0] = sp[1] = INVALID_SOCKET;
+
+  (void) memset(&sa, 0, sizeof(sa));
+  sa.sin.sin_family = AF_INET;
+  sa.sin.sin_port = htons(0);
+  sa.sin.sin_addr.s_addr = htonl(0x7f000001); /* 127.0.0.1 */
+
+  if ((sock = socket(AF_INET, sock_type, 0)) == INVALID_SOCKET) {
+  } else if (bind(sock, &sa.sa, len) != 0) {
+  } else if (sock_type == SOCK_STREAM && listen(sock, 1) != 0) {
+  } else if (getsockname(sock, &sa.sa, &len) != 0) {
+  } else if ((sp[0] = socket(AF_INET, sock_type, 0)) == INVALID_SOCKET) {
+  } else if (connect(sp[0], &sa.sa, len) != 0) {
+  } else if (sock_type == SOCK_DGRAM &&
+             (getsockname(sp[0], &sa.sa, &len) != 0 ||
+              connect(sock, &sa.sa, len) != 0)) {
+  } else if ((sp[1] = (sock_type == SOCK_DGRAM ? sock
+                                               : accept(sock, &sa.sa, &len))) ==
+             INVALID_SOCKET) {
+  } else {
+    mg_set_close_on_exec(sp[0]);
+    mg_set_close_on_exec(sp[1]);
+    if (sock_type == SOCK_STREAM) closesocket(sock);
+    ret = 1;
+  }
+
+  if (!ret) {
+    if (sp[0] != INVALID_SOCKET) closesocket(sp[0]);
+    if (sp[1] != INVALID_SOCKET) closesocket(sp[1]);
+    if (sock != INVALID_SOCKET) closesocket(sock);
+    sock = sp[0] = sp[1] = INVALID_SOCKET;
+  }
+
+  return ret;
+}
+#endif /* MG_ENABLE_BROADCAST */
+
+static void mg_sock_get_addr(sock_t sock, int remote,
+                             union socket_address *sa) {
+  socklen_t slen = sizeof(*sa);
+  memset(sa, 0, slen);
+  if (remote) {
+    getpeername(sock, &sa->sa, &slen);
+  } else {
+    getsockname(sock, &sa->sa, &slen);
+  }
+}
+
+void mg_sock_to_str(sock_t sock, char *buf, size_t len, int flags) {
+  union socket_address sa;
+  mg_sock_get_addr(sock, flags & MG_SOCK_STRINGIFY_REMOTE, &sa);
+  mg_sock_addr_to_str(&sa, buf, len, flags);
+}
+
+void mg_socket_if_get_conn_addr(struct mg_connection *nc, int remote,
+                                union socket_address *sa) {
+  mg_sock_get_addr(nc->sock, remote, sa);
+}
+
+/* clang-format off */
+#define MG_SOCKET_IFACE_VTABLE                                          \
+  {                                                                     \
+    mg_socket_if_init,                                                  \
+    mg_socket_if_free,                                                  \
+    mg_socket_if_add_conn,                                              \
+    mg_socket_if_remove_conn,                                           \
+    mg_socket_if_poll,                                                  \
+    mg_socket_if_listen_tcp,                                            \
+    mg_socket_if_listen_udp,                                            \
+    mg_socket_if_connect_tcp,                                           \
+    mg_socket_if_connect_udp,                                           \
+    mg_socket_if_tcp_send,                                              \
+    mg_socket_if_udp_send,                                              \
+    mg_socket_if_recved,                                                \
+    mg_socket_if_create_conn,                                           \
+    mg_socket_if_destroy_conn,                                          \
+    mg_socket_if_sock_set,                                              \
+    mg_socket_if_get_conn_addr,                                         \
+  }
+/* clang-format on */
+
+struct mg_iface_vtable mg_socket_iface_vtable = MG_SOCKET_IFACE_VTABLE;
+#if MG_NET_IF == MG_NET_IF_SOCKET
+struct mg_iface_vtable mg_default_iface_vtable = MG_SOCKET_IFACE_VTABLE;
+#endif
+
+#endif /* MG_ENABLE_NET_IF_SOCKET */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/net_if_tun.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_TUN
+
+/* Amalgamated: #include "common/cs_dbg.h" */
+/* Amalgamated: #include "common/cs_time.h" */
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/net_if_tun.h" */
+/* Amalgamated: #include "mongoose/src/tun.h" */
+/* Amalgamated: #include "mongoose/src/util.h" */
+
+#define MG_TCP_RECV_BUFFER_SIZE 1024
+#define MG_UDP_RECV_BUFFER_SIZE 1500
+
+void mg_tun_if_connect_tcp(struct mg_connection *nc,
+                           const union socket_address *sa) {
+  (void) nc;
+  (void) sa;
+}
+
+void mg_tun_if_connect_udp(struct mg_connection *nc) {
+  (void) nc;
+}
+
+int mg_tun_if_listen_tcp(struct mg_connection *nc, union socket_address *sa) {
+  (void) nc;
+  (void) sa;
+  return 0;
+}
+
+int mg_tun_if_listen_udp(struct mg_connection *nc, union socket_address *sa) {
+  (void) nc;
+  (void) sa;
+  return -1;
+}
+
+void mg_tun_if_tcp_send(struct mg_connection *nc, const void *buf, size_t len) {
+  struct mg_tun_client *client = (struct mg_tun_client *) nc->iface->data;
+  uint32_t stream_id = (uint32_t)(uintptr_t) nc->mgr_data;
+  struct mg_str msg = {(char *) buf, len};
+#if MG_ENABLE_HEXDUMP
+  char hex[512];
+  mg_hexdump(buf, len, hex, sizeof(hex));
+  LOG(LL_DEBUG, ("sending to stream %zu:\n%s", stream_id, hex));
+#endif
+
+  mg_tun_send_frame(client->disp, stream_id, MG_TUN_DATA_FRAME, 0, msg);
+}
+
+void mg_tun_if_udp_send(struct mg_connection *nc, const void *buf, size_t len) {
+  (void) nc;
+  (void) buf;
+  (void) len;
+}
+
+void mg_tun_if_recved(struct mg_connection *nc, size_t len) {
+  (void) nc;
+  (void) len;
+}
+
+int mg_tun_if_create_conn(struct mg_connection *nc) {
+  (void) nc;
+  return 1;
+}
+
+void mg_tun_if_destroy_conn(struct mg_connection *nc) {
+  struct mg_tun_client *client = (struct mg_tun_client *) nc->iface->data;
+
+  if (nc->flags & MG_F_LISTENING) {
+    mg_tun_destroy_client(client);
+  } else if (client->disp) {
+    uint32_t stream_id = (uint32_t)(uintptr_t) nc->mgr_data;
+    struct mg_str msg = {NULL, 0};
+
+    LOG(LL_DEBUG, ("closing %zu:", stream_id));
+    mg_tun_send_frame(client->disp, stream_id, MG_TUN_DATA_FRAME,
+                      MG_TUN_F_END_STREAM, msg);
+  }
+}
+
+/* Associate a socket to a connection. */
+void mg_tun_if_sock_set(struct mg_connection *nc, sock_t sock) {
+  (void) nc;
+  (void) sock;
+}
+
+void mg_tun_if_init(struct mg_iface *iface) {
+  (void) iface;
+}
+
+void mg_tun_if_free(struct mg_iface *iface) {
+  (void) iface;
+}
+
+void mg_tun_if_add_conn(struct mg_connection *nc) {
+  nc->sock = INVALID_SOCKET;
+}
+
+void mg_tun_if_remove_conn(struct mg_connection *nc) {
+  (void) nc;
+}
+
+time_t mg_tun_if_poll(struct mg_iface *iface, int timeout_ms) {
+  (void) iface;
+  (void) timeout_ms;
+  return (time_t) cs_time();
+}
+
+void mg_tun_if_get_conn_addr(struct mg_connection *nc, int remote,
+                             union socket_address *sa) {
+  (void) nc;
+  (void) remote;
+  (void) sa;
+}
+
+struct mg_connection *mg_tun_if_find_conn(struct mg_tun_client *client,
+                                          uint32_t stream_id) {
+  struct mg_connection *nc = NULL;
+
+  for (nc = client->mgr->active_connections; nc != NULL; nc = nc->next) {
+    if (nc->iface != client->iface || (nc->flags & MG_F_LISTENING)) {
+      continue;
+    }
+    if (stream_id == (uint32_t)(uintptr_t) nc->mgr_data) {
+      return nc;
+    }
+  }
+
+  if (stream_id > client->last_stream_id) {
+    /* create a new connection */
+    LOG(LL_DEBUG, ("new stream 0x%lx, accepting", stream_id));
+    nc = mg_if_accept_new_conn(client->listener);
+    nc->mgr_data = (void *) (uintptr_t) stream_id;
+    client->last_stream_id = stream_id;
+  } else {
+    LOG(LL_DEBUG, ("Ignoring stream 0x%lx (last_stream_id 0x%lx)", stream_id,
+                   client->last_stream_id));
+  }
+
+  return nc;
+}
+
+/* clang-format off */
+#define MG_TUN_IFACE_VTABLE                                             \
+  {                                                                     \
+    mg_tun_if_init,                                                     \
+    mg_tun_if_free,                                                     \
+    mg_tun_if_add_conn,                                                 \
+    mg_tun_if_remove_conn,                                              \
+    mg_tun_if_poll,                                                     \
+    mg_tun_if_listen_tcp,                                               \
+    mg_tun_if_listen_udp,                                               \
+    mg_tun_if_connect_tcp,                                              \
+    mg_tun_if_connect_udp,                                              \
+    mg_tun_if_tcp_send,                                                 \
+    mg_tun_if_udp_send,                                                 \
+    mg_tun_if_recved,                                                   \
+    mg_tun_if_create_conn,                                              \
+    mg_tun_if_destroy_conn,                                             \
+    mg_tun_if_sock_set,                                                 \
+    mg_tun_if_get_conn_addr,                                            \
+  }
+/* clang-format on */
+
+struct mg_iface_vtable mg_tun_iface_vtable = MG_TUN_IFACE_VTABLE;
+
+#endif /* MG_ENABLE_TUN */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/ssl_if_openssl.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_OPENSSL
+
+#ifdef __APPLE__
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+
+#include <openssl/ssl.h>
+
+struct mg_ssl_if_ctx {
+  SSL *ssl;
+  SSL_CTX *ssl_ctx;
+  struct mbuf psk;
+  size_t identity_len;
+};
+
+void mg_ssl_if_init() {
+  SSL_library_init();
+}
+
+enum mg_ssl_if_result mg_ssl_if_conn_accept(struct mg_connection *nc,
+                                            struct mg_connection *lc) {
+  struct mg_ssl_if_ctx *ctx =
+      (struct mg_ssl_if_ctx *) MG_CALLOC(1, sizeof(*ctx));
+  struct mg_ssl_if_ctx *lc_ctx = (struct mg_ssl_if_ctx *) lc->ssl_if_data;
+  nc->ssl_if_data = ctx;
+  if (ctx == NULL || lc_ctx == NULL) return MG_SSL_ERROR;
+  ctx->ssl_ctx = lc_ctx->ssl_ctx;
+  if ((ctx->ssl = SSL_new(ctx->ssl_ctx)) == NULL) {
+    return MG_SSL_ERROR;
+  }
+  return MG_SSL_OK;
+}
+
+static enum mg_ssl_if_result mg_use_cert(SSL_CTX *ctx, const char *cert,
+                                         const char *key, const char **err_msg);
+static enum mg_ssl_if_result mg_use_ca_cert(SSL_CTX *ctx, const char *cert);
+static enum mg_ssl_if_result mg_set_cipher_list(SSL_CTX *ctx, const char *cl);
+static enum mg_ssl_if_result mg_ssl_if_ossl_set_psk(struct mg_ssl_if_ctx *ctx,
+                                                    const char *identity,
+                                                    const char *key_str);
+
+enum mg_ssl_if_result mg_ssl_if_conn_init(
+    struct mg_connection *nc, const struct mg_ssl_if_conn_params *params,
+    const char **err_msg) {
+  struct mg_ssl_if_ctx *ctx =
+      (struct mg_ssl_if_ctx *) MG_CALLOC(1, sizeof(*ctx));
+  DBG(("%p %s,%s,%s", nc, (params->cert ? params->cert : ""),
+       (params->key ? params->key : ""),
+       (params->ca_cert ? params->ca_cert : "")));
+  if (ctx == NULL) {
+    MG_SET_PTRPTR(err_msg, "Out of memory");
+    return MG_SSL_ERROR;
+  }
+  nc->ssl_if_data = ctx;
+  if (nc->flags & MG_F_LISTENING) {
+    ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method());
+  } else {
+    ctx->ssl_ctx = SSL_CTX_new(SSLv23_client_method());
+  }
+  if (ctx->ssl_ctx == NULL) {
+    MG_SET_PTRPTR(err_msg, "Failed to create SSL context");
+    return MG_SSL_ERROR;
+  }
+
+  if (params->cert != NULL &&
+      mg_use_cert(ctx->ssl_ctx, params->cert, params->key, err_msg) !=
+          MG_SSL_OK) {
+    return MG_SSL_ERROR;
+  }
+
+  if (params->ca_cert != NULL &&
+      mg_use_ca_cert(ctx->ssl_ctx, params->ca_cert) != MG_SSL_OK) {
+    MG_SET_PTRPTR(err_msg, "Invalid SSL CA cert");
+    return MG_SSL_ERROR;
+  }
+
+  if (params->server_name != NULL) {
+#ifdef KR_VERSION
+    SSL_CTX_kr_set_verify_name(ctx->ssl_ctx, params->server_name);
+#else
+/* TODO(rojer): Implement server name verification on OpenSSL. */
+#endif
+  }
+
+  if (mg_set_cipher_list(ctx->ssl_ctx, params->cipher_suites) != MG_SSL_OK) {
+    MG_SET_PTRPTR(err_msg, "Invalid cipher suite list");
+    return MG_SSL_ERROR;
+  }
+
+  mbuf_init(&ctx->psk, 0);
+  if (mg_ssl_if_ossl_set_psk(ctx, params->psk_identity, params->psk_key) !=
+      MG_SSL_OK) {
+    MG_SET_PTRPTR(err_msg, "Invalid PSK settings");
+    return MG_SSL_ERROR;
+  }
+
+  if (!(nc->flags & MG_F_LISTENING) &&
+      (ctx->ssl = SSL_new(ctx->ssl_ctx)) == NULL) {
+    MG_SET_PTRPTR(err_msg, "Failed to create SSL session");
+    return MG_SSL_ERROR;
+  }
+
+  nc->flags |= MG_F_SSL;
+
+  return MG_SSL_OK;
+}
+
+static enum mg_ssl_if_result mg_ssl_if_ssl_err(struct mg_connection *nc,
+                                               int res) {
+  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
+  int err = SSL_get_error(ctx->ssl, res);
+  if (err == SSL_ERROR_WANT_READ) return MG_SSL_WANT_READ;
+  if (err == SSL_ERROR_WANT_WRITE) return MG_SSL_WANT_WRITE;
+  DBG(("%p %p SSL error: %d %d", nc, ctx->ssl_ctx, res, err));
+  nc->err = err;
+  return MG_SSL_ERROR;
+}
+
+enum mg_ssl_if_result mg_ssl_if_handshake(struct mg_connection *nc) {
+  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
+  int server_side = (nc->listener != NULL);
+  int res;
+  /* If descriptor is not yet set, do it now. */
+  if (SSL_get_fd(ctx->ssl) < 0) {
+    if (SSL_set_fd(ctx->ssl, nc->sock) != 1) return MG_SSL_ERROR;
+  }
+  res = server_side ? SSL_accept(ctx->ssl) : SSL_connect(ctx->ssl);
+  if (res != 1) return mg_ssl_if_ssl_err(nc, res);
+  return MG_SSL_OK;
+}
+
+int mg_ssl_if_read(struct mg_connection *nc, void *buf, size_t buf_size) {
+  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
+  int n = SSL_read(ctx->ssl, buf, buf_size);
+  DBG(("%p %d -> %d", nc, (int) buf_size, n));
+  if (n < 0) return mg_ssl_if_ssl_err(nc, n);
+  if (n == 0) nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+  return n;
+}
+
+int mg_ssl_if_write(struct mg_connection *nc, const void *data, size_t len) {
+  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
+  int n = SSL_write(ctx->ssl, data, len);
+  DBG(("%p %d -> %d", nc, (int) len, n));
+  if (n <= 0) return mg_ssl_if_ssl_err(nc, n);
+  return n;
+}
+
+void mg_ssl_if_conn_free(struct mg_connection *nc) {
+  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
+  if (ctx == NULL) return;
+  nc->ssl_if_data = NULL;
+  if (ctx->ssl != NULL) SSL_free(ctx->ssl);
+  if (ctx->ssl_ctx != NULL && nc->listener == NULL) SSL_CTX_free(ctx->ssl_ctx);
+  mbuf_free(&ctx->psk);
+  memset(ctx, 0, sizeof(*ctx));
+  MG_FREE(ctx);
+}
+
+/*
+ * Cipher suite options used for TLS negotiation.
+ * https://wiki.mozilla.org/Security/Server_Side_TLS#Recommended_configurations
+ */
+static const char mg_s_cipher_list[] =
+#if defined(MG_SSL_CRYPTO_MODERN)
+    "ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:"
+    "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:"
+    "DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:"
+    "ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:"
+    "ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:"
+    "ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:"
+    "DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:"
+    "DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:"
+    "!aNULL:!eNULL:!EXPORT:!DES:!RC4:!3DES:!MD5:!PSK"
+#elif defined(MG_SSL_CRYPTO_OLD)
+    "ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:"
+    "ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:"
+    "DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:"
+    "ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:"
+    "ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:"
+    "ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:"
+    "DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:"
+    "DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:ECDHE-RSA-DES-CBC3-SHA:"
+    "ECDHE-ECDSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:"
+    "AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:DES-CBC3-SHA:"
+    "HIGH:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:"
+    "!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA"
+#else /* Default - intermediate. */
+    "ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:"
+    "ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:"
+    "DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:"
+    "ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:"
+    "ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:"
+    "ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:"
+    "DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:"
+    "DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:"
+    "AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:"
+    "DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:"
+    "!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA"
+#endif
+    ;
+
+/*
+ * Default DH params for PFS cipher negotiation. This is a 2048-bit group.
+ * Will be used if none are provided by the user in the certificate file.
+ */
+#if !MG_DISABLE_PFS && !defined(KR_VERSION)
+static const char mg_s_default_dh_params[] =
+    "\
+-----BEGIN DH PARAMETERS-----\n\
+MIIBCAKCAQEAlvbgD/qh9znWIlGFcV0zdltD7rq8FeShIqIhkQ0C7hYFThrBvF2E\n\
+Z9bmgaP+sfQwGpVlv9mtaWjvERbu6mEG7JTkgmVUJrUt/wiRzwTaCXBqZkdUO8Tq\n\
++E6VOEQAilstG90ikN1Tfo+K6+X68XkRUIlgawBTKuvKVwBhuvlqTGerOtnXWnrt\n\
+ym//hd3cd5PBYGBix0i7oR4xdghvfR2WLVu0LgdThTBb6XP7gLd19cQ1JuBtAajZ\n\
+wMuPn7qlUkEFDIkAZy59/Hue/H2Q2vU/JsvVhHWCQBL4F1ofEAt50il6ZxR1QfFK\n\
+9VGKDC4oOgm9DlxwwBoC2FjqmvQlqVV3kwIBAg==\n\
+-----END DH PARAMETERS-----\n";
+#endif
+
+static enum mg_ssl_if_result mg_use_ca_cert(SSL_CTX *ctx, const char *cert) {
+  if (cert == NULL || strcmp(cert, "*") == 0) {
+    return MG_SSL_OK;
+  }
+  SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, 0);
+  return SSL_CTX_load_verify_locations(ctx, cert, NULL) == 1 ? MG_SSL_OK
+                                                             : MG_SSL_ERROR;
+}
+
+static enum mg_ssl_if_result mg_use_cert(SSL_CTX *ctx, const char *cert,
+                                         const char *key,
+                                         const char **err_msg) {
+  if (key == NULL) key = cert;
+  if (cert == NULL || cert[0] == '\0' || key == NULL || key[0] == '\0') {
+    return MG_SSL_OK;
+  } else if (SSL_CTX_use_certificate_file(ctx, cert, 1) == 0) {
+    MG_SET_PTRPTR(err_msg, "Invalid SSL cert");
+    return MG_SSL_ERROR;
+  } else if (SSL_CTX_use_PrivateKey_file(ctx, key, 1) == 0) {
+    MG_SET_PTRPTR(err_msg, "Invalid SSL key");
+    return MG_SSL_ERROR;
+  } else if (SSL_CTX_use_certificate_chain_file(ctx, cert) == 0) {
+    MG_SET_PTRPTR(err_msg, "Invalid CA bundle");
+    return MG_SSL_ERROR;
+  } else {
+    SSL_CTX_set_mode(ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
+#if !MG_DISABLE_PFS && !defined(KR_VERSION)
+    BIO *bio = NULL;
+    DH *dh = NULL;
+
+    /* Try to read DH parameters from the cert/key file. */
+    bio = BIO_new_file(cert, "r");
+    if (bio != NULL) {
+      dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
+      BIO_free(bio);
+    }
+    /*
+     * If there are no DH params in the file, fall back to hard-coded ones.
+     * Not ideal, but better than nothing.
+     */
+    if (dh == NULL) {
+      bio = BIO_new_mem_buf((void *) mg_s_default_dh_params, -1);
+      dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
+      BIO_free(bio);
+    }
+    if (dh != NULL) {
+      SSL_CTX_set_tmp_dh(ctx, dh);
+      SSL_CTX_set_options(ctx, SSL_OP_SINGLE_DH_USE);
+      DH_free(dh);
+    }
+#if OPENSSL_VERSION_NUMBER > 0x10002000L
+    SSL_CTX_set_ecdh_auto(ctx, 1);
+#endif
+#endif
+  }
+  return MG_SSL_OK;
+}
+
+static enum mg_ssl_if_result mg_set_cipher_list(SSL_CTX *ctx, const char *cl) {
+  return (SSL_CTX_set_cipher_list(ctx, cl ? cl : mg_s_cipher_list) == 1
+              ? MG_SSL_OK
+              : MG_SSL_ERROR);
+}
+
+#ifndef KR_VERSION
+static unsigned int mg_ssl_if_ossl_psk_cb(SSL *ssl, const char *hint,
+                                          char *identity,
+                                          unsigned int max_identity_len,
+                                          unsigned char *psk,
+                                          unsigned int max_psk_len) {
+  struct mg_ssl_if_ctx *ctx =
+      (struct mg_ssl_if_ctx *) ssl->ctx->msg_callback_arg;
+  size_t key_len = ctx->psk.len - ctx->identity_len - 1;
+  DBG(("hint: '%s'", (hint ? hint : "")));
+  if (ctx->identity_len + 1 > max_identity_len) {
+    DBG(("identity too long"));
+    return 0;
+  }
+  if (key_len > max_psk_len) {
+    DBG(("key too long"));
+    return 0;
+  }
+  memcpy(identity, ctx->psk.buf, ctx->identity_len + 1);
+  memcpy(psk, ctx->psk.buf + ctx->identity_len + 1, key_len);
+  (void) ssl;
+  return key_len;
+}
+
+static enum mg_ssl_if_result mg_ssl_if_ossl_set_psk(struct mg_ssl_if_ctx *ctx,
+                                                    const char *identity,
+                                                    const char *key_str) {
+  unsigned char key[32];
+  size_t key_len;
+  size_t i = 0;
+  if (identity == NULL && key_str == NULL) return MG_SSL_OK;
+  if (identity == NULL || key_str == NULL) return MG_SSL_ERROR;
+  key_len = strlen(key_str);
+  if (key_len != 32 && key_len != 64) return MG_SSL_ERROR;
+  memset(key, 0, sizeof(key));
+  key_len = 0;
+  for (i = 0; key_str[i] != '\0'; i++) {
+    unsigned char c;
+    char hc = tolower((int) key_str[i]);
+    if (hc >= '0' && hc <= '9') {
+      c = hc - '0';
+    } else if (hc >= 'a' && hc <= 'f') {
+      c = hc - 'a' + 0xa;
+    } else {
+      return MG_SSL_ERROR;
+    }
+    key_len = i / 2;
+    key[key_len] <<= 4;
+    key[key_len] |= c;
+  }
+  key_len++;
+  DBG(("identity = '%s', key = (%u)", identity, (unsigned int) key_len));
+  ctx->identity_len = strlen(identity);
+  mbuf_append(&ctx->psk, identity, ctx->identity_len + 1);
+  mbuf_append(&ctx->psk, key, key_len);
+  SSL_CTX_set_psk_client_callback(ctx->ssl_ctx, mg_ssl_if_ossl_psk_cb);
+  /* Hack: there is no field for us to keep this, so we use msg_callback_arg */
+  ctx->ssl_ctx->msg_callback_arg = ctx;
+  return MG_SSL_OK;
+}
+#else
+static enum mg_ssl_if_result mg_ssl_if_ossl_set_psk(struct mg_ssl_if_ctx *ctx,
+                                                    const char *identity,
+                                                    const char *key_str) {
+  (void) ctx;
+  (void) identity;
+  (void) key_str;
+  /* Krypton does not support PSK. */
+  return MG_SSL_ERROR;
+}
+#endif /* defined(KR_VERSION) */
+
+const char *mg_set_ssl(struct mg_connection *nc, const char *cert,
+                       const char *ca_cert) {
+  const char *err_msg = NULL;
+  struct mg_ssl_if_conn_params params;
+  memset(&params, 0, sizeof(params));
+  params.cert = cert;
+  params.ca_cert = ca_cert;
+  if (mg_ssl_if_conn_init(nc, &params, &err_msg) != MG_SSL_OK) {
+    return err_msg;
+  }
+  return NULL;
+}
+
+#endif /* MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_OPENSSL */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/ssl_if_mbedtls.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_MBEDTLS
+
+#include <mbedtls/debug.h>
+#include <mbedtls/ecp.h>
+#include <mbedtls/platform.h>
+#include <mbedtls/ssl.h>
+#include <mbedtls/x509_crt.h>
+
+static void mg_ssl_mbed_log(void *ctx, int level, const char *file, int line,
+                            const char *str) {
+  enum cs_log_level cs_level;
+  switch (level) {
+    case 1:
+      cs_level = LL_ERROR;
+      break;
+    case 2:
+    case 3:
+      cs_level = LL_DEBUG;
+      break;
+    default:
+      cs_level = LL_VERBOSE_DEBUG;
+  }
+  /* mbedTLS passes strings with \n at the end, strip it. */
+  LOG(cs_level, ("%p %.*s", ctx, (int) (strlen(str) - 1), str));
+  (void) file;
+  (void) line;
+}
+
+struct mg_ssl_if_ctx {
+  mbedtls_ssl_config *conf;
+  mbedtls_ssl_context *ssl;
+  mbedtls_x509_crt *cert;
+  mbedtls_pk_context *key;
+  mbedtls_x509_crt *ca_cert;
+  struct mbuf cipher_suites;
+};
+
+/* Must be provided by the platform. ctx is struct mg_connection. */
+extern int mg_ssl_if_mbed_random(void *ctx, unsigned char *buf, size_t len);
+
+void mg_ssl_if_init() {
+}
+
+enum mg_ssl_if_result mg_ssl_if_conn_accept(struct mg_connection *nc,
+                                            struct mg_connection *lc) {
+  struct mg_ssl_if_ctx *ctx =
+      (struct mg_ssl_if_ctx *) MG_CALLOC(1, sizeof(*ctx));
+  struct mg_ssl_if_ctx *lc_ctx = (struct mg_ssl_if_ctx *) lc->ssl_if_data;
+  nc->ssl_if_data = ctx;
+  if (ctx == NULL || lc_ctx == NULL) return MG_SSL_ERROR;
+  ctx->ssl = (mbedtls_ssl_context *) MG_CALLOC(1, sizeof(*ctx->ssl));
+  if (mbedtls_ssl_setup(ctx->ssl, lc_ctx->conf) != 0) {
+    return MG_SSL_ERROR;
+  }
+  return MG_SSL_OK;
+}
+
+static enum mg_ssl_if_result mg_use_cert(struct mg_ssl_if_ctx *ctx,
+                                         const char *cert, const char *key,
+                                         const char **err_msg);
+static enum mg_ssl_if_result mg_use_ca_cert(struct mg_ssl_if_ctx *ctx,
+                                            const char *cert);
+static enum mg_ssl_if_result mg_set_cipher_list(struct mg_ssl_if_ctx *ctx,
+                                                const char *ciphers);
+static enum mg_ssl_if_result mg_ssl_if_mbed_set_psk(struct mg_ssl_if_ctx *ctx,
+                                                    const char *identity,
+                                                    const char *key);
+
+enum mg_ssl_if_result mg_ssl_if_conn_init(
+    struct mg_connection *nc, const struct mg_ssl_if_conn_params *params,
+    const char **err_msg) {
+  struct mg_ssl_if_ctx *ctx =
+      (struct mg_ssl_if_ctx *) MG_CALLOC(1, sizeof(*ctx));
+  DBG(("%p %s,%s,%s", nc, (params->cert ? params->cert : ""),
+       (params->key ? params->key : ""),
+       (params->ca_cert ? params->ca_cert : "")));
+
+  if (ctx == NULL) {
+    MG_SET_PTRPTR(err_msg, "Out of memory");
+    return MG_SSL_ERROR;
+  }
+  nc->ssl_if_data = ctx;
+  ctx->conf = (mbedtls_ssl_config *) MG_CALLOC(1, sizeof(*ctx->conf));
+  mbuf_init(&ctx->cipher_suites, 0);
+  mbedtls_ssl_config_init(ctx->conf);
+  mbedtls_ssl_conf_dbg(ctx->conf, mg_ssl_mbed_log, nc);
+  if (mbedtls_ssl_config_defaults(
+          ctx->conf, (nc->flags & MG_F_LISTENING ? MBEDTLS_SSL_IS_SERVER
+                                                 : MBEDTLS_SSL_IS_CLIENT),
+          MBEDTLS_SSL_TRANSPORT_STREAM, MBEDTLS_SSL_PRESET_DEFAULT) != 0) {
+    MG_SET_PTRPTR(err_msg, "Failed to init SSL config");
+    return MG_SSL_ERROR;
+  }
+
+  /* TLS 1.2 and up */
+  mbedtls_ssl_conf_min_version(ctx->conf, MBEDTLS_SSL_MAJOR_VERSION_3,
+                               MBEDTLS_SSL_MINOR_VERSION_3);
+  mbedtls_ssl_conf_rng(ctx->conf, mg_ssl_if_mbed_random, nc);
+
+  if (params->cert != NULL &&
+      mg_use_cert(ctx, params->cert, params->key, err_msg) != MG_SSL_OK) {
+    return MG_SSL_ERROR;
+  }
+
+  if (params->ca_cert != NULL &&
+      mg_use_ca_cert(ctx, params->ca_cert) != MG_SSL_OK) {
+    MG_SET_PTRPTR(err_msg, "Invalid SSL CA cert");
+    return MG_SSL_ERROR;
+  }
+
+  if (mg_set_cipher_list(ctx, params->cipher_suites) != MG_SSL_OK) {
+    MG_SET_PTRPTR(err_msg, "Invalid cipher suite list");
+    return MG_SSL_ERROR;
+  }
+
+  if (mg_ssl_if_mbed_set_psk(ctx, params->psk_identity, params->psk_key) !=
+      MG_SSL_OK) {
+    MG_SET_PTRPTR(err_msg, "Invalid PSK settings");
+    return MG_SSL_ERROR;
+  }
+
+  if (!(nc->flags & MG_F_LISTENING)) {
+    ctx->ssl = (mbedtls_ssl_context *) MG_CALLOC(1, sizeof(*ctx->ssl));
+    mbedtls_ssl_init(ctx->ssl);
+    if (mbedtls_ssl_setup(ctx->ssl, ctx->conf) != 0) {
+      MG_SET_PTRPTR(err_msg, "Failed to create SSL session");
+      return MG_SSL_ERROR;
+    }
+    if (params->server_name != NULL &&
+        mbedtls_ssl_set_hostname(ctx->ssl, params->server_name) != 0) {
+      return MG_SSL_ERROR;
+    }
+  }
+
+#ifdef MG_SSL_IF_MBEDTLS_MAX_FRAG_LEN
+  if (mbedtls_ssl_conf_max_frag_len(ctx->conf,
+#if MG_SSL_IF_MBEDTLS_MAX_FRAG_LEN == 512
+                                    MBEDTLS_SSL_MAX_FRAG_LEN_512
+#elif MG_SSL_IF_MBEDTLS_MAX_FRAG_LEN == 1024
+                                    MBEDTLS_SSL_MAX_FRAG_LEN_1024
+#elif MG_SSL_IF_MBEDTLS_MAX_FRAG_LEN == 2048
+                                    MBEDTLS_SSL_MAX_FRAG_LEN_2048
+#elif MG_SSL_IF_MBEDTLS_MAX_FRAG_LEN == 4096
+                                    MBEDTLS_SSL_MAX_FRAG_LEN_4096
+#else
+#error Invalid MG_SSL_IF_MBEDTLS_MAX_FRAG_LEN
+#endif
+                                    ) != 0) {
+    return MG_SSL_ERROR;
+  }
+#endif
+
+  nc->flags |= MG_F_SSL;
+
+  return MG_SSL_OK;
+}
+
+#if MG_NET_IF == MG_NET_IF_LWIP_LOW_LEVEL
+int ssl_socket_send(void *ctx, const unsigned char *buf, size_t len);
+int ssl_socket_recv(void *ctx, unsigned char *buf, size_t len);
+#else
+static int ssl_socket_send(void *ctx, const unsigned char *buf, size_t len) {
+  struct mg_connection *nc = (struct mg_connection *) ctx;
+  int n = (int) MG_SEND_FUNC(nc->sock, buf, len, 0);
+  LOG(LL_DEBUG, ("%p %d -> %d", nc, (int) len, n));
+  if (n >= 0) return n;
+  n = mg_get_errno();
+  return ((n == EAGAIN || n == EINPROGRESS) ? MBEDTLS_ERR_SSL_WANT_WRITE : -1);
+}
+
+static int ssl_socket_recv(void *ctx, unsigned char *buf, size_t len) {
+  struct mg_connection *nc = (struct mg_connection *) ctx;
+  int n = (int) MG_RECV_FUNC(nc->sock, buf, len, 0);
+  LOG(LL_DEBUG, ("%p %d <- %d", nc, (int) len, n));
+  if (n >= 0) return n;
+  n = mg_get_errno();
+  return ((n == EAGAIN || n == EINPROGRESS) ? MBEDTLS_ERR_SSL_WANT_READ : -1);
+}
+#endif
+
+static enum mg_ssl_if_result mg_ssl_if_mbed_err(struct mg_connection *nc,
+                                                int ret) {
+  if (ret == MBEDTLS_ERR_SSL_WANT_READ) return MG_SSL_WANT_READ;
+  if (ret == MBEDTLS_ERR_SSL_WANT_WRITE) return MG_SSL_WANT_WRITE;
+  if (ret !=
+      MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) { /* CLOSE_NOTIFY = Normal shutdown */
+    LOG(LL_ERROR, ("%p SSL error: %d", nc, ret));
+  }
+  nc->err = ret;
+  nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+  return MG_SSL_ERROR;
+}
+
+static void mg_ssl_if_mbed_free_certs_and_keys(struct mg_ssl_if_ctx *ctx) {
+  if (ctx->cert != NULL) {
+    mbedtls_x509_crt_free(ctx->cert);
+    MG_FREE(ctx->cert);
+    ctx->cert = NULL;
+    mbedtls_pk_free(ctx->key);
+    MG_FREE(ctx->key);
+    ctx->key = NULL;
+  }
+  if (ctx->ca_cert != NULL) {
+    mbedtls_ssl_conf_ca_chain(ctx->conf, NULL, NULL);
+    mbedtls_x509_crt_free(ctx->ca_cert);
+    MG_FREE(ctx->ca_cert);
+    ctx->ca_cert = NULL;
+  }
+}
+
+enum mg_ssl_if_result mg_ssl_if_handshake(struct mg_connection *nc) {
+  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
+  int err;
+  /* If bio is not yet set, do it now. */
+  if (ctx->ssl->p_bio == NULL) {
+    mbedtls_ssl_set_bio(ctx->ssl, nc, ssl_socket_send, ssl_socket_recv, NULL);
+  }
+  err = mbedtls_ssl_handshake(ctx->ssl);
+  if (err != 0) return mg_ssl_if_mbed_err(nc, err);
+#ifdef MG_SSL_IF_MBEDTLS_FREE_CERTS
+  /*
+   * Free the peer certificate, we don't need it after handshake.
+   * Note that this effectively disables renegotiation.
+   */
+  mbedtls_x509_crt_free(ctx->ssl->session->peer_cert);
+  mbedtls_free(ctx->ssl->session->peer_cert);
+  ctx->ssl->session->peer_cert = NULL;
+  /* On a client connection we can also free our own and CA certs. */
+  if (nc->listener == NULL) {
+    if (ctx->conf->key_cert != NULL) {
+      /* Note that this assumes one key_cert entry, which matches our init. */
+      MG_FREE(ctx->conf->key_cert);
+      ctx->conf->key_cert = NULL;
+    }
+    mbedtls_ssl_conf_ca_chain(ctx->conf, NULL, NULL);
+    mg_ssl_if_mbed_free_certs_and_keys(ctx);
+  }
+#endif
+  return MG_SSL_OK;
+}
+
+int mg_ssl_if_read(struct mg_connection *nc, void *buf, size_t buf_size) {
+  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
+  int n = mbedtls_ssl_read(ctx->ssl, (unsigned char *) buf, buf_size);
+  DBG(("%p %d -> %d", nc, (int) buf_size, n));
+  if (n < 0) return mg_ssl_if_mbed_err(nc, n);
+  if (n == 0) nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+  return n;
+}
+
+int mg_ssl_if_write(struct mg_connection *nc, const void *data, size_t len) {
+  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
+  int n = mbedtls_ssl_write(ctx->ssl, (const unsigned char *) data, len);
+  DBG(("%p %d -> %d", nc, (int) len, n));
+  if (n < 0) return mg_ssl_if_mbed_err(nc, n);
+  return n;
+}
+
+void mg_ssl_if_conn_free(struct mg_connection *nc) {
+  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
+  if (ctx == NULL) return;
+  nc->ssl_if_data = NULL;
+  if (ctx->ssl != NULL) {
+    mbedtls_ssl_free(ctx->ssl);
+    MG_FREE(ctx->ssl);
+  }
+  mg_ssl_if_mbed_free_certs_and_keys(ctx);
+  if (ctx->conf != NULL) {
+    mbedtls_ssl_config_free(ctx->conf);
+    MG_FREE(ctx->conf);
+  }
+  mbuf_free(&ctx->cipher_suites);
+  memset(ctx, 0, sizeof(*ctx));
+  MG_FREE(ctx);
+}
+
+static enum mg_ssl_if_result mg_use_ca_cert(struct mg_ssl_if_ctx *ctx,
+                                            const char *ca_cert) {
+  if (ca_cert == NULL || strcmp(ca_cert, "*") == 0) {
+    return MG_SSL_OK;
+  }
+  ctx->ca_cert = (mbedtls_x509_crt *) MG_CALLOC(1, sizeof(*ctx->ca_cert));
+  mbedtls_x509_crt_init(ctx->ca_cert);
+  if (mbedtls_x509_crt_parse_file(ctx->ca_cert, ca_cert) != 0) {
+    return MG_SSL_ERROR;
+  }
+  mbedtls_ssl_conf_ca_chain(ctx->conf, ctx->ca_cert, NULL);
+  mbedtls_ssl_conf_authmode(ctx->conf, MBEDTLS_SSL_VERIFY_REQUIRED);
+  return MG_SSL_OK;
+}
+
+static enum mg_ssl_if_result mg_use_cert(struct mg_ssl_if_ctx *ctx,
+                                         const char *cert, const char *key,
+                                         const char **err_msg) {
+  if (key == NULL) key = cert;
+  if (cert == NULL || cert[0] == '\0' || key == NULL || key[0] == '\0') {
+    return MG_SSL_OK;
+  }
+  ctx->cert = (mbedtls_x509_crt *) MG_CALLOC(1, sizeof(*ctx->cert));
+  mbedtls_x509_crt_init(ctx->cert);
+  ctx->key = (mbedtls_pk_context *) MG_CALLOC(1, sizeof(*ctx->key));
+  mbedtls_pk_init(ctx->key);
+  if (mbedtls_x509_crt_parse_file(ctx->cert, cert) != 0) {
+    MG_SET_PTRPTR(err_msg, "Invalid SSL cert");
+    return MG_SSL_ERROR;
+  }
+  if (mbedtls_pk_parse_keyfile(ctx->key, key, NULL) != 0) {
+    MG_SET_PTRPTR(err_msg, "Invalid SSL key");
+    return MG_SSL_ERROR;
+  }
+  if (mbedtls_ssl_conf_own_cert(ctx->conf, ctx->cert, ctx->key) != 0) {
+    MG_SET_PTRPTR(err_msg, "Invalid SSL key or cert");
+    return MG_SSL_ERROR;
+  }
+  return MG_SSL_OK;
+}
+
+static const int mg_s_cipher_list[] = {
+    MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+    MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+    MBEDTLS_TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,
+    MBEDTLS_TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,
+    MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256,
+    MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256,
+    MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,
+    MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256,
+    MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256,
+    MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,
+    MBEDTLS_TLS_RSA_WITH_AES_128_GCM_SHA256,
+    MBEDTLS_TLS_RSA_WITH_AES_128_CBC_SHA256,
+    MBEDTLS_TLS_RSA_WITH_AES_128_CBC_SHA, 0};
+
+/*
+ * Ciphers can be specified as a colon-separated list of cipher suite names.
+ * These can be found in
+ * https://github.com/ARMmbed/mbedtls/blob/development/library/ssl_ciphersuites.c#L267
+ * E.g.: TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256:TLS-DHE-RSA-WITH-AES-256-CCM
+ */
+static enum mg_ssl_if_result mg_set_cipher_list(struct mg_ssl_if_ctx *ctx,
+                                                const char *ciphers) {
+  if (ciphers != NULL) {
+    int l, id;
+    const char *s = ciphers, *e;
+    char tmp[50];
+    while (s != NULL) {
+      e = strchr(s, ':');
+      l = (e != NULL ? (e - s) : (int) strlen(s));
+      strncpy(tmp, s, l);
+      tmp[l] = '\0';
+      id = mbedtls_ssl_get_ciphersuite_id(tmp);
+      DBG(("%s -> %04x", tmp, id));
+      if (id != 0) {
+        mbuf_append(&ctx->cipher_suites, &id, sizeof(id));
+      }
+      s = (e != NULL ? e + 1 : NULL);
+    }
+    if (ctx->cipher_suites.len == 0) return MG_SSL_ERROR;
+    id = 0;
+    mbuf_append(&ctx->cipher_suites, &id, sizeof(id));
+    mbuf_trim(&ctx->cipher_suites);
+    mbedtls_ssl_conf_ciphersuites(ctx->conf,
+                                  (const int *) ctx->cipher_suites.buf);
+  } else {
+    mbedtls_ssl_conf_ciphersuites(ctx->conf, mg_s_cipher_list);
+  }
+  return MG_SSL_OK;
+}
+
+static enum mg_ssl_if_result mg_ssl_if_mbed_set_psk(struct mg_ssl_if_ctx *ctx,
+                                                    const char *identity,
+                                                    const char *key_str) {
+  unsigned char key[32];
+  size_t key_len;
+  if (identity == NULL && key_str == NULL) return MG_SSL_OK;
+  if (identity == NULL || key_str == NULL) return MG_SSL_ERROR;
+  key_len = strlen(key_str);
+  if (key_len != 32 && key_len != 64) return MG_SSL_ERROR;
+  size_t i = 0;
+  memset(key, 0, sizeof(key));
+  key_len = 0;
+  for (i = 0; key_str[i] != '\0'; i++) {
+    unsigned char c;
+    char hc = tolower((int) key_str[i]);
+    if (hc >= '0' && hc <= '9') {
+      c = hc - '0';
+    } else if (hc >= 'a' && hc <= 'f') {
+      c = hc - 'a' + 0xa;
+    } else {
+      return MG_SSL_ERROR;
+    }
+    key_len = i / 2;
+    key[key_len] <<= 4;
+    key[key_len] |= c;
+  }
+  key_len++;
+  DBG(("identity = '%s', key = (%u)", identity, (unsigned int) key_len));
+  /* mbedTLS makes copies of psk and identity. */
+  if (mbedtls_ssl_conf_psk(ctx->conf, (const unsigned char *) key, key_len,
+                           (const unsigned char *) identity,
+                           strlen(identity)) != 0) {
+    return MG_SSL_ERROR;
+  }
+  return MG_SSL_OK;
+}
+
+const char *mg_set_ssl(struct mg_connection *nc, const char *cert,
+                       const char *ca_cert) {
+  const char *err_msg = NULL;
+  struct mg_ssl_if_conn_params params;
+  memset(&params, 0, sizeof(params));
+  params.cert = cert;
+  params.ca_cert = ca_cert;
+  if (mg_ssl_if_conn_init(nc, &params, &err_msg) != MG_SSL_OK) {
+    return err_msg;
+  }
+  return NULL;
+}
+
+/* Lazy RNG. Warning: it would be a bad idea to do this in production! */
+#ifdef MG_SSL_MBED_DUMMY_RANDOM
+int mg_ssl_if_mbed_random(void *ctx, unsigned char *buf, size_t len) {
+  (void) ctx;
+  while (len--) *buf++ = rand();
+  return 0;
+}
+#endif
+
+#endif /* MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_MBEDTLS */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/uri.c"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/uri.h" */
+
+/*
+ * scan string until `sep`, keeping track of component boundaries in `res`.
+ *
+ * `p` will point to the char after the separator or it will be `end`.
+ */
+static void parse_uri_component(const char **p, const char *end, char sep,
+                                struct mg_str *res) {
+  res->p = *p;
+  for (; *p < end; (*p)++) {
+    if (**p == sep) {
+      break;
+    }
+  }
+  res->len = (*p) - res->p;
+  if (*p < end) (*p)++;
+}
+
+int mg_parse_uri(struct mg_str uri, struct mg_str *scheme,
+                 struct mg_str *user_info, struct mg_str *host,
+                 unsigned int *port, struct mg_str *path, struct mg_str *query,
+                 struct mg_str *fragment) {
+  struct mg_str rscheme = {0, 0}, ruser_info = {0, 0}, rhost = {0, 0},
+                rpath = {0, 0}, rquery = {0, 0}, rfragment = {0, 0};
+  unsigned int rport = 0;
+  enum {
+    P_START,
+    P_SCHEME_OR_PORT,
+    P_USER_INFO,
+    P_HOST,
+    P_PORT,
+    P_REST
+  } state = P_START;
+
+  const char *p = uri.p, *end = p + uri.len;
+  while (p < end) {
+    switch (state) {
+      case P_START:
+        /*
+         * expecting on of:
+         * - `scheme://xxxx`
+         * - `xxxx:port`
+         * - `xxxx/path`
+         */
+        for (; p < end; p++) {
+          if (*p == ':') {
+            state = P_SCHEME_OR_PORT;
+            break;
+          } else if (*p == '/') {
+            state = P_REST;
+            break;
+          }
+        }
+        if (state == P_START || state == P_REST) {
+          rhost.p = uri.p;
+          rhost.len = p - uri.p;
+        }
+        break;
+      case P_SCHEME_OR_PORT:
+        if (end - p >= 3 && strncmp(p, "://", 3) == 0) {
+          rscheme.p = uri.p;
+          rscheme.len = p - uri.p;
+          state = P_USER_INFO;
+          p += 2; /* point to last separator char */
+        } else {
+          rhost.p = uri.p;
+          rhost.len = p - uri.p;
+          state = P_PORT;
+        }
+        break;
+      case P_USER_INFO:
+        p++;
+        ruser_info.p = p;
+        for (; p < end; p++) {
+          if (*p == '@') {
+            state = P_HOST;
+            break;
+          } else if (*p == '/') {
+            break;
+          }
+        }
+        if (p == end || *p == '/') {
+          /* backtrack and parse as host */
+          state = P_HOST;
+          p = ruser_info.p;
+        }
+        ruser_info.len = p - ruser_info.p;
+        break;
+      case P_HOST:
+        if (*p == '@') p++;
+        rhost.p = p;
+        for (; p < end; p++) {
+          if (*p == ':') {
+            state = P_PORT;
+            break;
+          } else if (*p == '/') {
+            state = P_REST;
+            break;
+          }
+        }
+        rhost.len = p - rhost.p;
+        break;
+      case P_PORT:
+        p++;
+        for (; p < end; p++) {
+          if (*p == '/') {
+            state = P_REST;
+            break;
+          }
+          rport *= 10;
+          rport += *p - '0';
+        }
+        break;
+      case P_REST:
+        /* `p` points to separator. `path` includes the separator */
+        parse_uri_component(&p, end, '?', &rpath);
+        parse_uri_component(&p, end, '#', &rquery);
+        parse_uri_component(&p, end, '\0', &rfragment);
+        break;
+    }
+  }
+
+  if (scheme != 0) *scheme = rscheme;
+  if (user_info != 0) *user_info = ruser_info;
+  if (host != 0) *host = rhost;
+  if (port != 0) *port = rport;
+  if (path != 0) *path = rpath;
+  if (query != 0) *query = rquery;
+  if (fragment != 0) *fragment = rfragment;
+
+  return 0;
+}
+
+/* Normalize the URI path. Remove/resolve "." and "..". */
+int mg_normalize_uri_path(const struct mg_str *in, struct mg_str *out) {
+  const char *s = in->p, *se = s + in->len;
+  char *cp = (char *) out->p, *d;
+
+  if (in->len == 0 || *s != '/') {
+    out->len = 0;
+    return 0;
+  }
+
+  d = cp;
+
+  while (s < se) {
+    const char *next = s;
+    struct mg_str component;
+    parse_uri_component(&next, se, '/', &component);
+    if (mg_vcmp(&component, ".") == 0) {
+      /* Yum. */
+    } else if (mg_vcmp(&component, "..") == 0) {
+      /* Backtrack to previous slash. */
+      if (d > cp + 1 && *(d - 1) == '/') d--;
+      while (d > cp && *(d - 1) != '/') d--;
+    } else {
+      memmove(d, s, next - s);
+      d += next - s;
+    }
+    s = next;
+  }
+  if (d == cp) *d++ = '/';
+
+  out->p = cp;
+  out->len = d - cp;
+  return 1;
+}
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/http.c"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_HTTP
+
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/util.h" */
+/* Amalgamated: #include "common/sha1.h" */
+/* Amalgamated: #include "common/md5.h" */
+
+static const char *mg_version_header = "Mongoose/" MG_VERSION;
+
+enum mg_http_proto_data_type { DATA_NONE, DATA_FILE, DATA_PUT };
+
+struct mg_http_proto_data_file {
+  FILE *fp;      /* Opened file. */
+  int64_t cl;    /* Content-Length. How many bytes to send. */
+  int64_t sent;  /* How many bytes have been already sent. */
+  int keepalive; /* Keep connection open after sending. */
+  enum mg_http_proto_data_type type;
+};
+
+#if MG_ENABLE_HTTP_CGI
+struct mg_http_proto_data_cgi {
+  struct mg_connection *cgi_nc;
+};
+#endif
+
+struct mg_http_proto_data_chuncked {
+  int64_t body_len; /* How many bytes of chunked body was reassembled. */
+};
+
+struct mg_http_endpoint {
+  struct mg_http_endpoint *next;
+  const char *name;
+  size_t name_len;
+  mg_event_handler_t handler;
+};
+
+enum mg_http_multipart_stream_state {
+  MPS_BEGIN,
+  MPS_WAITING_FOR_BOUNDARY,
+  MPS_WAITING_FOR_CHUNK,
+  MPS_GOT_CHUNK,
+  MPS_GOT_BOUNDARY,
+  MPS_FINALIZE,
+  MPS_FINISHED
+};
+
+struct mg_http_multipart_stream {
+  const char *boundary;
+  int boundary_len;
+  const char *var_name;
+  const char *file_name;
+  void *user_data;
+  int prev_io_len;
+  enum mg_http_multipart_stream_state state;
+  int processing_part;
+};
+
+struct mg_reverse_proxy_data {
+  struct mg_connection *linked_conn;
+};
+
+struct mg_http_proto_data {
+#if MG_ENABLE_FILESYSTEM
+  struct mg_http_proto_data_file file;
+#endif
+#if MG_ENABLE_HTTP_CGI
+  struct mg_http_proto_data_cgi cgi;
+#endif
+#if MG_ENABLE_HTTP_STREAMING_MULTIPART
+  struct mg_http_multipart_stream mp_stream;
+#endif
+  struct mg_http_proto_data_chuncked chunk;
+  struct mg_http_endpoint *endpoints;
+  mg_event_handler_t endpoint_handler;
+  struct mg_reverse_proxy_data reverse_proxy_data;
+};
+
+static void mg_http_conn_destructor(void *proto_data);
+struct mg_connection *mg_connect_http_base(
+    struct mg_mgr *mgr, mg_event_handler_t ev_handler,
+    struct mg_connect_opts opts, const char *schema, const char *schema_ssl,
+    const char *url, const char **path, char **user, char **pass, char **addr);
+
+static struct mg_http_proto_data *mg_http_get_proto_data(
+    struct mg_connection *c) {
+  if (c->proto_data == NULL) {
+    c->proto_data = MG_CALLOC(1, sizeof(struct mg_http_proto_data));
+    c->proto_data_destructor = mg_http_conn_destructor;
+  }
+
+  return (struct mg_http_proto_data *) c->proto_data;
+}
+
+#if MG_ENABLE_HTTP_STREAMING_MULTIPART
+static void mg_http_free_proto_data_mp_stream(
+    struct mg_http_multipart_stream *mp) {
+  MG_FREE((void *) mp->boundary);
+  MG_FREE((void *) mp->var_name);
+  MG_FREE((void *) mp->file_name);
+  memset(mp, 0, sizeof(*mp));
+}
+#endif
+
+#if MG_ENABLE_FILESYSTEM
+static void mg_http_free_proto_data_file(struct mg_http_proto_data_file *d) {
+  if (d != NULL) {
+    if (d->fp != NULL) {
+      fclose(d->fp);
+    }
+    memset(d, 0, sizeof(struct mg_http_proto_data_file));
+  }
+}
+#endif
+
+static void mg_http_free_proto_data_endpoints(struct mg_http_endpoint **ep) {
+  struct mg_http_endpoint *current = *ep;
+
+  while (current != NULL) {
+    struct mg_http_endpoint *tmp = current->next;
+    MG_FREE((void *) current->name);
+    MG_FREE(current);
+    current = tmp;
+  }
+
+  ep = NULL;
+}
+
+static void mg_http_free_reverse_proxy_data(struct mg_reverse_proxy_data *rpd) {
+  if (rpd->linked_conn != NULL) {
+    /*
+     * Connection has linked one, we have to unlink & close it
+     * since _this_ connection is going to die and
+     * it doesn't make sense to keep another one
+     */
+    struct mg_http_proto_data *pd = mg_http_get_proto_data(rpd->linked_conn);
+    if (pd->reverse_proxy_data.linked_conn != NULL) {
+      pd->reverse_proxy_data.linked_conn->flags |= MG_F_SEND_AND_CLOSE;
+      pd->reverse_proxy_data.linked_conn = NULL;
+    }
+    rpd->linked_conn = NULL;
+  }
+}
+
+static void mg_http_conn_destructor(void *proto_data) {
+  struct mg_http_proto_data *pd = (struct mg_http_proto_data *) proto_data;
+#if MG_ENABLE_FILESYSTEM
+  mg_http_free_proto_data_file(&pd->file);
+#endif
+#if MG_ENABLE_HTTP_CGI
+  mg_http_free_proto_data_cgi(&pd->cgi);
+#endif
+#if MG_ENABLE_HTTP_STREAMING_MULTIPART
+  mg_http_free_proto_data_mp_stream(&pd->mp_stream);
+#endif
+  mg_http_free_proto_data_endpoints(&pd->endpoints);
+  mg_http_free_reverse_proxy_data(&pd->reverse_proxy_data);
+  MG_FREE(proto_data);
+}
+
+#if MG_ENABLE_FILESYSTEM
+
+#define MIME_ENTRY(_ext, _type) \
+  { _ext, sizeof(_ext) - 1, _type }
+static const struct {
+  const char *extension;
+  size_t ext_len;
+  const char *mime_type;
+} mg_static_builtin_mime_types[] = {
+    MIME_ENTRY("html", "text/html"),
+    MIME_ENTRY("html", "text/html"),
+    MIME_ENTRY("htm", "text/html"),
+    MIME_ENTRY("shtm", "text/html"),
+    MIME_ENTRY("shtml", "text/html"),
+    MIME_ENTRY("css", "text/css"),
+    MIME_ENTRY("js", "application/x-javascript"),
+    MIME_ENTRY("ico", "image/x-icon"),
+    MIME_ENTRY("gif", "image/gif"),
+    MIME_ENTRY("jpg", "image/jpeg"),
+    MIME_ENTRY("jpeg", "image/jpeg"),
+    MIME_ENTRY("png", "image/png"),
+    MIME_ENTRY("svg", "image/svg+xml"),
+    MIME_ENTRY("txt", "text/plain"),
+    MIME_ENTRY("torrent", "application/x-bittorrent"),
+    MIME_ENTRY("wav", "audio/x-wav"),
+    MIME_ENTRY("mp3", "audio/x-mp3"),
+    MIME_ENTRY("mid", "audio/mid"),
+    MIME_ENTRY("m3u", "audio/x-mpegurl"),
+    MIME_ENTRY("ogg", "application/ogg"),
+    MIME_ENTRY("ram", "audio/x-pn-realaudio"),
+    MIME_ENTRY("xml", "text/xml"),
+    MIME_ENTRY("ttf", "application/x-font-ttf"),
+    MIME_ENTRY("json", "application/json"),
+    MIME_ENTRY("xslt", "application/xml"),
+    MIME_ENTRY("xsl", "application/xml"),
+    MIME_ENTRY("ra", "audio/x-pn-realaudio"),
+    MIME_ENTRY("doc", "application/msword"),
+    MIME_ENTRY("exe", "application/octet-stream"),
+    MIME_ENTRY("zip", "application/x-zip-compressed"),
+    MIME_ENTRY("xls", "application/excel"),
+    MIME_ENTRY("tgz", "application/x-tar-gz"),
+    MIME_ENTRY("tar", "application/x-tar"),
+    MIME_ENTRY("gz", "application/x-gunzip"),
+    MIME_ENTRY("arj", "application/x-arj-compressed"),
+    MIME_ENTRY("rar", "application/x-rar-compressed"),
+    MIME_ENTRY("rtf", "application/rtf"),
+    MIME_ENTRY("pdf", "application/pdf"),
+    MIME_ENTRY("swf", "application/x-shockwave-flash"),
+    MIME_ENTRY("mpg", "video/mpeg"),
+    MIME_ENTRY("webm", "video/webm"),
+    MIME_ENTRY("mpeg", "video/mpeg"),
+    MIME_ENTRY("mov", "video/quicktime"),
+    MIME_ENTRY("mp4", "video/mp4"),
+    MIME_ENTRY("m4v", "video/x-m4v"),
+    MIME_ENTRY("asf", "video/x-ms-asf"),
+    MIME_ENTRY("avi", "video/x-msvideo"),
+    MIME_ENTRY("bmp", "image/bmp"),
+    {NULL, 0, NULL}};
+
+static struct mg_str mg_get_mime_type(const char *path, const char *dflt,
+                                      const struct mg_serve_http_opts *opts) {
+  const char *ext, *overrides;
+  size_t i, path_len;
+  struct mg_str r, k, v;
+
+  path_len = strlen(path);
+
+  overrides = opts->custom_mime_types;
+  while ((overrides = mg_next_comma_list_entry(overrides, &k, &v)) != NULL) {
+    ext = path + (path_len - k.len);
+    if (path_len > k.len && mg_vcasecmp(&k, ext) == 0) {
+      return v;
+    }
+  }
+
+  for (i = 0; mg_static_builtin_mime_types[i].extension != NULL; i++) {
+    ext = path + (path_len - mg_static_builtin_mime_types[i].ext_len);
+    if (path_len > mg_static_builtin_mime_types[i].ext_len && ext[-1] == '.' &&
+        mg_casecmp(ext, mg_static_builtin_mime_types[i].extension) == 0) {
+      r.p = mg_static_builtin_mime_types[i].mime_type;
+      r.len = strlen(r.p);
+      return r;
+    }
+  }
+
+  r.p = dflt;
+  r.len = strlen(r.p);
+  return r;
+}
+#endif
+
+/*
+ * Check whether full request is buffered. Return:
+ *   -1  if request is malformed
+ *    0  if request is not yet fully buffered
+ *   >0  actual request length, including last \r\n\r\n
+ */
+static int mg_http_get_request_len(const char *s, int buf_len) {
+  const unsigned char *buf = (unsigned char *) s;
+  int i;
+
+  for (i = 0; i < buf_len; i++) {
+    if (!isprint(buf[i]) && buf[i] != '\r' && buf[i] != '\n' && buf[i] < 128) {
+      return -1;
+    } else if (buf[i] == '\n' && i + 1 < buf_len && buf[i + 1] == '\n') {
+      return i + 2;
+    } else if (buf[i] == '\n' && i + 2 < buf_len && buf[i + 1] == '\r' &&
+               buf[i + 2] == '\n') {
+      return i + 3;
+    }
+  }
+
+  return 0;
+}
+
+static const char *mg_http_parse_headers(const char *s, const char *end,
+                                         int len, struct http_message *req) {
+  int i = 0;
+  while (i < (int) ARRAY_SIZE(req->header_names) - 1) {
+    struct mg_str *k = &req->header_names[i], *v = &req->header_values[i];
+
+    s = mg_skip(s, end, ": ", k);
+    s = mg_skip(s, end, "\r\n", v);
+
+    while (v->len > 0 && v->p[v->len - 1] == ' ') {
+      v->len--; /* Trim trailing spaces in header value */
+    }
+
+    /*
+     * If header value is empty - skip it and go to next (if any).
+     * NOTE: Do not add it to headers_values because such addition changes API
+     * behaviour
+     */
+    if (k->len != 0 && v->len == 0) {
+      continue;
+    }
+
+    if (k->len == 0 || v->len == 0) {
+      k->p = v->p = NULL;
+      k->len = v->len = 0;
+      break;
+    }
+
+    if (!mg_ncasecmp(k->p, "Content-Length", 14)) {
+      req->body.len = (size_t) to64(v->p);
+      req->message.len = len + req->body.len;
+    }
+
+    i++;
+  }
+
+  return s;
+}
+
+int mg_parse_http(const char *s, int n, struct http_message *hm, int is_req) {
+  const char *end, *qs;
+  int len = mg_http_get_request_len(s, n);
+
+  if (len <= 0) return len;
+
+  memset(hm, 0, sizeof(*hm));
+  hm->message.p = s;
+  hm->body.p = s + len;
+  hm->message.len = hm->body.len = (size_t) ~0;
+  end = s + len;
+
+  /* Request is fully buffered. Skip leading whitespaces. */
+  while (s < end && isspace(*(unsigned char *) s)) s++;
+
+  if (is_req) {
+    /* Parse request line: method, URI, proto */
+    s = mg_skip(s, end, " ", &hm->method);
+    s = mg_skip(s, end, " ", &hm->uri);
+    s = mg_skip(s, end, "\r\n", &hm->proto);
+    if (hm->uri.p <= hm->method.p || hm->proto.p <= hm->uri.p) return -1;
+
+    /* If URI contains '?' character, initialize query_string */
+    if ((qs = (char *) memchr(hm->uri.p, '?', hm->uri.len)) != NULL) {
+      hm->query_string.p = qs + 1;
+      hm->query_string.len = &hm->uri.p[hm->uri.len] - (qs + 1);
+      hm->uri.len = qs - hm->uri.p;
+    }
+  } else {
+    s = mg_skip(s, end, " ", &hm->proto);
+    if (end - s < 4 || s[3] != ' ') return -1;
+    hm->resp_code = atoi(s);
+    if (hm->resp_code < 100 || hm->resp_code >= 600) return -1;
+    s += 4;
+    s = mg_skip(s, end, "\r\n", &hm->resp_status_msg);
+  }
+
+  s = mg_http_parse_headers(s, end, len, hm);
+
+  /*
+   * mg_parse_http() is used to parse both HTTP requests and HTTP
+   * responses. If HTTP response does not have Content-Length set, then
+   * body is read until socket is closed, i.e. body.len is infinite (~0).
+   *
+   * For HTTP requests though, according to
+   * http://tools.ietf.org/html/rfc7231#section-8.1.3,
+   * only POST and PUT methods have defined body semantics.
+   * Therefore, if Content-Length is not specified and methods are
+   * not one of PUT or POST, set body length to 0.
+   *
+   * So,
+   * if it is HTTP request, and Content-Length is not set,
+   * and method is not (PUT or POST) then reset body length to zero.
+   */
+  if (hm->body.len == (size_t) ~0 && is_req &&
+      mg_vcasecmp(&hm->method, "PUT") != 0 &&
+      mg_vcasecmp(&hm->method, "POST") != 0) {
+    hm->body.len = 0;
+    hm->message.len = len;
+  }
+
+  return len;
+}
+
+struct mg_str *mg_get_http_header(struct http_message *hm, const char *name) {
+  size_t i, len = strlen(name);
+
+  for (i = 0; hm->header_names[i].len > 0; i++) {
+    struct mg_str *h = &hm->header_names[i], *v = &hm->header_values[i];
+    if (h->p != NULL && h->len == len && !mg_ncasecmp(h->p, name, len))
+      return v;
+  }
+
+  return NULL;
+}
+
+#if MG_ENABLE_FILESYSTEM
+static void mg_http_transfer_file_data(struct mg_connection *nc) {
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
+  char buf[MG_MAX_HTTP_SEND_MBUF];
+  size_t n = 0, to_read = 0, left = (size_t)(pd->file.cl - pd->file.sent);
+
+  if (pd->file.type == DATA_FILE) {
+    struct mbuf *io = &nc->send_mbuf;
+    if (io->len < sizeof(buf)) {
+      to_read = sizeof(buf) - io->len;
+    }
+
+    if (left > 0 && to_read > left) {
+      to_read = left;
+    }
+
+    if (to_read == 0) {
+      /* Rate limiting. send_mbuf is too full, wait until it's drained. */
+    } else if (pd->file.sent < pd->file.cl &&
+               (n = fread(buf, 1, to_read, pd->file.fp)) > 0) {
+      mg_send(nc, buf, n);
+      pd->file.sent += n;
+    } else {
+      if (!pd->file.keepalive) nc->flags |= MG_F_SEND_AND_CLOSE;
+      mg_http_free_proto_data_file(&pd->file);
+    }
+  } else if (pd->file.type == DATA_PUT) {
+    struct mbuf *io = &nc->recv_mbuf;
+    size_t to_write = left <= 0 ? 0 : left < io->len ? (size_t) left : io->len;
+    size_t n = fwrite(io->buf, 1, to_write, pd->file.fp);
+    if (n > 0) {
+      mbuf_remove(io, n);
+      pd->file.sent += n;
+    }
+    if (n == 0 || pd->file.sent >= pd->file.cl) {
+      if (!pd->file.keepalive) nc->flags |= MG_F_SEND_AND_CLOSE;
+      mg_http_free_proto_data_file(&pd->file);
+    }
+  }
+#if MG_ENABLE_HTTP_CGI
+  else if (pd->cgi.cgi_nc != NULL) {
+    /* This is POST data that needs to be forwarded to the CGI process */
+    if (pd->cgi.cgi_nc != NULL) {
+      mg_forward(nc, pd->cgi.cgi_nc);
+    } else {
+      nc->flags |= MG_F_SEND_AND_CLOSE;
+    }
+  }
+#endif
+}
+#endif /* MG_ENABLE_FILESYSTEM */
+
+/*
+ * Parse chunked-encoded buffer. Return 0 if the buffer is not encoded, or
+ * if it's incomplete. If the chunk is fully buffered, return total number of
+ * bytes in a chunk, and store data in `data`, `data_len`.
+ */
+static size_t mg_http_parse_chunk(char *buf, size_t len, char **chunk_data,
+                                  size_t *chunk_len) {
+  unsigned char *s = (unsigned char *) buf;
+  size_t n = 0; /* scanned chunk length */
+  size_t i = 0; /* index in s */
+
+  /* Scan chunk length. That should be a hexadecimal number. */
+  while (i < len && isxdigit(s[i])) {
+    n *= 16;
+    n += (s[i] >= '0' && s[i] <= '9') ? s[i] - '0' : tolower(s[i]) - 'a' + 10;
+    i++;
+  }
+
+  /* Skip new line */
+  if (i == 0 || i + 2 > len || s[i] != '\r' || s[i + 1] != '\n') {
+    return 0;
+  }
+  i += 2;
+
+  /* Record where the data is */
+  *chunk_data = (char *) s + i;
+  *chunk_len = n;
+
+  /* Skip data */
+  i += n;
+
+  /* Skip new line */
+  if (i == 0 || i + 2 > len || s[i] != '\r' || s[i + 1] != '\n') {
+    return 0;
+  }
+  return i + 2;
+}
+
+MG_INTERNAL size_t mg_handle_chunked(struct mg_connection *nc,
+                                     struct http_message *hm, char *buf,
+                                     size_t blen) {
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
+  char *data;
+  size_t i, n, data_len, body_len, zero_chunk_received = 0;
+  /* Find out piece of received data that is not yet reassembled */
+  body_len = (size_t) pd->chunk.body_len;
+  assert(blen >= body_len);
+
+  /* Traverse all fully buffered chunks */
+  for (i = body_len;
+       (n = mg_http_parse_chunk(buf + i, blen - i, &data, &data_len)) > 0;
+       i += n) {
+    /* Collapse chunk data to the rest of HTTP body */
+    memmove(buf + body_len, data, data_len);
+    body_len += data_len;
+    hm->body.len = body_len;
+
+    if (data_len == 0) {
+      zero_chunk_received = 1;
+      i += n;
+      break;
+    }
+  }
+
+  if (i > body_len) {
+    /* Shift unparsed content to the parsed body */
+    assert(i <= blen);
+    memmove(buf + body_len, buf + i, blen - i);
+    memset(buf + body_len + blen - i, 0, i - body_len);
+    nc->recv_mbuf.len -= i - body_len;
+    pd->chunk.body_len = body_len;
+
+    /* Send MG_EV_HTTP_CHUNK event */
+    nc->flags &= ~MG_F_DELETE_CHUNK;
+    mg_call(nc, nc->handler, MG_EV_HTTP_CHUNK, hm);
+
+    /* Delete processed data if user set MG_F_DELETE_CHUNK flag */
+    if (nc->flags & MG_F_DELETE_CHUNK) {
+      memset(buf, 0, body_len);
+      memmove(buf, buf + body_len, blen - i);
+      nc->recv_mbuf.len -= body_len;
+      hm->body.len = 0;
+      pd->chunk.body_len = 0;
+    }
+
+    if (zero_chunk_received) {
+      /* Total message size is len(body) + len(headers) */
+      hm->message.len =
+          (size_t) pd->chunk.body_len + blen - i + (hm->body.p - hm->message.p);
+    }
+  }
+
+  return body_len;
+}
+
+static mg_event_handler_t mg_http_get_endpoint_handler(
+    struct mg_connection *nc, struct mg_str *uri_path) {
+  struct mg_http_proto_data *pd;
+  mg_event_handler_t ret = NULL;
+  int matched, matched_max = 0;
+  struct mg_http_endpoint *ep;
+
+  if (nc == NULL) {
+    return NULL;
+  }
+
+  pd = mg_http_get_proto_data(nc);
+
+  ep = pd->endpoints;
+  while (ep != NULL) {
+    const struct mg_str name_s = {ep->name, ep->name_len};
+    if ((matched = mg_match_prefix_n(name_s, *uri_path)) != -1) {
+      if (matched > matched_max) {
+        /* Looking for the longest suitable handler */
+        ret = ep->handler;
+        matched_max = matched;
+      }
+    }
+
+    ep = ep->next;
+  }
+
+  return ret;
+}
+
+static void mg_http_call_endpoint_handler(struct mg_connection *nc, int ev,
+                                          struct http_message *hm) {
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
+
+  if (pd->endpoint_handler == NULL || ev == MG_EV_HTTP_REQUEST) {
+    pd->endpoint_handler =
+        ev == MG_EV_HTTP_REQUEST
+            ? mg_http_get_endpoint_handler(nc->listener, &hm->uri)
+            : NULL;
+  }
+  mg_call(nc, pd->endpoint_handler ? pd->endpoint_handler : nc->handler, ev,
+          hm);
+}
+
+#if MG_ENABLE_HTTP_STREAMING_MULTIPART
+static void mg_http_multipart_continue(struct mg_connection *nc);
+
+static void mg_http_multipart_begin(struct mg_connection *nc,
+                                    struct http_message *hm, int req_len);
+
+#endif
+
+/*
+ * lx106 compiler has a bug (TODO(mkm) report and insert tracking bug here)
+ * If a big structure is declared in a big function, lx106 gcc will make it
+ * even bigger (round up to 4k, from 700 bytes of actual size).
+ */
+#ifdef __xtensa__
+static void mg_http_handler2(struct mg_connection *nc, int ev, void *ev_data,
+                             struct http_message *hm) __attribute__((noinline));
+
+void mg_http_handler(struct mg_connection *nc, int ev, void *ev_data) {
+  struct http_message hm;
+  mg_http_handler2(nc, ev, ev_data, &hm);
+}
+
+static void mg_http_handler2(struct mg_connection *nc, int ev, void *ev_data,
+                             struct http_message *hm) {
+#else  /* !__XTENSA__ */
+void mg_http_handler(struct mg_connection *nc, int ev, void *ev_data) {
+  struct http_message shm;
+  struct http_message *hm = &shm;
+#endif /* __XTENSA__ */
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
+  struct mbuf *io = &nc->recv_mbuf;
+  int req_len;
+  const int is_req = (nc->listener != NULL);
+#if MG_ENABLE_HTTP_WEBSOCKET
+  struct mg_str *vec;
+#endif
+  if (ev == MG_EV_CLOSE) {
+#if MG_ENABLE_HTTP_CGI
+    /* Close associated CGI forwarder connection */
+    if (pd->cgi.cgi_nc != NULL) {
+      pd->cgi.cgi_nc->user_data = NULL;
+      pd->cgi.cgi_nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+    }
+#endif
+#if MG_ENABLE_HTTP_STREAMING_MULTIPART
+    if (pd->mp_stream.boundary != NULL) {
+      /*
+       * Multipart message is in progress, but connection is closed.
+       * Finish part and request with an error flag.
+       */
+      struct mg_http_multipart_part mp;
+      memset(&mp, 0, sizeof(mp));
+      mp.status = -1;
+      mp.var_name = pd->mp_stream.var_name;
+      mp.file_name = pd->mp_stream.file_name;
+      mg_call(nc, (pd->endpoint_handler ? pd->endpoint_handler : nc->handler),
+              MG_EV_HTTP_PART_END, &mp);
+      mp.var_name = NULL;
+      mp.file_name = NULL;
+      mg_call(nc, (pd->endpoint_handler ? pd->endpoint_handler : nc->handler),
+              MG_EV_HTTP_MULTIPART_REQUEST_END, &mp);
+    } else
+#endif
+        if (io->len > 0 && mg_parse_http(io->buf, io->len, hm, is_req) > 0) {
+      /*
+      * For HTTP messages without Content-Length, always send HTTP message
+      * before MG_EV_CLOSE message.
+      */
+      int ev2 = is_req ? MG_EV_HTTP_REQUEST : MG_EV_HTTP_REPLY;
+      hm->message.len = io->len;
+      hm->body.len = io->buf + io->len - hm->body.p;
+      mg_http_call_endpoint_handler(nc, ev2, hm);
+    }
+  }
+
+#if MG_ENABLE_FILESYSTEM
+  if (pd->file.fp != NULL) {
+    mg_http_transfer_file_data(nc);
+  }
+#endif
+
+  mg_call(nc, nc->handler, ev, ev_data);
+
+  if (ev == MG_EV_RECV) {
+    struct mg_str *s;
+
+#if MG_ENABLE_HTTP_STREAMING_MULTIPART
+    if (pd->mp_stream.boundary != NULL) {
+      mg_http_multipart_continue(nc);
+      return;
+    }
+#endif /* MG_ENABLE_HTTP_STREAMING_MULTIPART */
+
+    req_len = mg_parse_http(io->buf, io->len, hm, is_req);
+
+    if (req_len > 0 &&
+        (s = mg_get_http_header(hm, "Transfer-Encoding")) != NULL &&
+        mg_vcasecmp(s, "chunked") == 0) {
+      mg_handle_chunked(nc, hm, io->buf + req_len, io->len - req_len);
+    }
+
+#if MG_ENABLE_HTTP_STREAMING_MULTIPART
+    if (req_len > 0 && (s = mg_get_http_header(hm, "Content-Type")) != NULL &&
+        s->len >= 9 && strncmp(s->p, "multipart", 9) == 0) {
+      mg_http_multipart_begin(nc, hm, req_len);
+      mg_http_multipart_continue(nc);
+      return;
+    }
+#endif /* MG_ENABLE_HTTP_STREAMING_MULTIPART */
+
+    /* TODO(alashkin): refactor this ifelseifelseifelseifelse */
+    if ((req_len < 0 ||
+         (req_len == 0 && io->len >= MG_MAX_HTTP_REQUEST_SIZE))) {
+      DBG(("invalid request"));
+      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+    } else if (req_len == 0) {
+      /* Do nothing, request is not yet fully buffered */
+    }
+#if MG_ENABLE_HTTP_WEBSOCKET
+    else if (nc->listener == NULL &&
+             mg_get_http_header(hm, "Sec-WebSocket-Accept")) {
+      /* We're websocket client, got handshake response from server. */
+      /* TODO(lsm): check the validity of accept Sec-WebSocket-Accept */
+      mbuf_remove(io, req_len);
+      nc->proto_handler = mg_ws_handler;
+      nc->flags |= MG_F_IS_WEBSOCKET;
+      mg_call(nc, nc->handler, MG_EV_WEBSOCKET_HANDSHAKE_DONE, NULL);
+      mg_ws_handler(nc, MG_EV_RECV, ev_data);
+    } else if (nc->listener != NULL &&
+               (vec = mg_get_http_header(hm, "Sec-WebSocket-Key")) != NULL) {
+      mg_event_handler_t handler;
+
+      /* This is a websocket request. Switch protocol handlers. */
+      mbuf_remove(io, req_len);
+      nc->proto_handler = mg_ws_handler;
+      nc->flags |= MG_F_IS_WEBSOCKET;
+
+      /*
+       * If we have a handler set up with mg_register_http_endpoint(),
+       * deliver subsequent websocket events to this handler after the
+       * protocol switch.
+       */
+      handler = mg_http_get_endpoint_handler(nc->listener, &hm->uri);
+      if (handler != NULL) {
+        nc->handler = handler;
+      }
+
+      /* Send handshake */
+      mg_call(nc, nc->handler, MG_EV_WEBSOCKET_HANDSHAKE_REQUEST, hm);
+      if (!(nc->flags & (MG_F_CLOSE_IMMEDIATELY | MG_F_SEND_AND_CLOSE))) {
+        if (nc->send_mbuf.len == 0) {
+          mg_ws_handshake(nc, vec);
+        }
+        mg_call(nc, nc->handler, MG_EV_WEBSOCKET_HANDSHAKE_DONE, NULL);
+        mg_ws_handler(nc, MG_EV_RECV, ev_data);
+      }
+    }
+#endif /* MG_ENABLE_HTTP_WEBSOCKET */
+    else if (hm->message.len <= io->len) {
+      int trigger_ev = nc->listener ? MG_EV_HTTP_REQUEST : MG_EV_HTTP_REPLY;
+
+/* Whole HTTP message is fully buffered, call event handler */
+
+#if MG_ENABLE_JAVASCRIPT
+      v7_val_t v1, v2, headers, req, args, res;
+      struct v7 *v7 = nc->mgr->v7;
+      const char *ev_name = trigger_ev == MG_EV_HTTP_REPLY ? "onsnd" : "onrcv";
+      int i, js_callback_handled_request = 0;
+
+      if (v7 != NULL) {
+        /* Lookup JS callback */
+        v1 = v7_get(v7, v7_get_global(v7), "Http", ~0);
+        v2 = v7_get(v7, v1, ev_name, ~0);
+
+        /* Create callback params. TODO(lsm): own/disown those */
+        args = v7_mk_array(v7);
+        req = v7_mk_object(v7);
+        headers = v7_mk_object(v7);
+
+        /* Populate request object */
+        v7_set(v7, req, "method", ~0,
+               v7_mk_string(v7, hm->method.p, hm->method.len, 1));
+        v7_set(v7, req, "uri", ~0, v7_mk_string(v7, hm->uri.p, hm->uri.len, 1));
+        v7_set(v7, req, "body", ~0,
+               v7_mk_string(v7, hm->body.p, hm->body.len, 1));
+        v7_set(v7, req, "headers", ~0, headers);
+        for (i = 0; hm->header_names[i].len > 0; i++) {
+          const struct mg_str *name = &hm->header_names[i];
+          const struct mg_str *value = &hm->header_values[i];
+          v7_set(v7, headers, name->p, name->len,
+                 v7_mk_string(v7, value->p, value->len, 1));
+        }
+
+        /* Invoke callback. TODO(lsm): report errors */
+        v7_array_push(v7, args, v7_mk_foreign(v7, nc));
+        v7_array_push(v7, args, req);
+        if (v7_apply(v7, v2, V7_UNDEFINED, args, &res) == V7_OK &&
+            v7_is_truthy(v7, res)) {
+          js_callback_handled_request++;
+        }
+      }
+
+      /* If JS callback returns true, stop request processing */
+      if (js_callback_handled_request) {
+        nc->flags |= MG_F_SEND_AND_CLOSE;
+      } else {
+        mg_http_call_endpoint_handler(nc, trigger_ev, hm);
+      }
+#else
+      mg_http_call_endpoint_handler(nc, trigger_ev, hm);
+#endif
+      mbuf_remove(io, hm->message.len);
+    }
+  }
+  (void) pd;
+}
+
+static size_t mg_get_line_len(const char *buf, size_t buf_len) {
+  size_t len = 0;
+  while (len < buf_len && buf[len] != '\n') len++;
+  return len == buf_len ? 0 : len + 1;
+}
+
+#if MG_ENABLE_HTTP_STREAMING_MULTIPART
+static void mg_http_multipart_begin(struct mg_connection *nc,
+                                    struct http_message *hm, int req_len) {
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
+  struct mg_str *ct;
+  struct mbuf *io = &nc->recv_mbuf;
+
+  char boundary[100];
+  int boundary_len;
+
+  ct = mg_get_http_header(hm, "Content-Type");
+  if (ct == NULL) {
+    /* We need more data - or it isn't multipart mesage */
+    goto exit_mp;
+  }
+
+  /* Content-type should start with "multipart" */
+  if (ct->len < 9 || strncmp(ct->p, "multipart", 9) != 0) {
+    goto exit_mp;
+  }
+
+  boundary_len =
+      mg_http_parse_header(ct, "boundary", boundary, sizeof(boundary));
+  if (boundary_len == 0) {
+    /*
+     * Content type is multipart, but there is no boundary,
+     * probably malformed request
+     */
+    nc->flags = MG_F_CLOSE_IMMEDIATELY;
+    DBG(("invalid request"));
+    goto exit_mp;
+  }
+
+  /* If we reach this place - that is multipart request */
+
+  if (pd->mp_stream.boundary != NULL) {
+    /*
+     * Another streaming request was in progress,
+     * looks like protocol error
+     */
+    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+  } else {
+    pd->mp_stream.state = MPS_BEGIN;
+    pd->mp_stream.boundary = MG_STRDUP(boundary);
+    pd->mp_stream.boundary_len = strlen(boundary);
+    pd->mp_stream.var_name = pd->mp_stream.file_name = NULL;
+
+    pd->endpoint_handler = mg_http_get_endpoint_handler(nc->listener, &hm->uri);
+    if (pd->endpoint_handler == NULL) {
+      pd->endpoint_handler = nc->handler;
+    }
+
+    mg_call(nc, pd->endpoint_handler, MG_EV_HTTP_MULTIPART_REQUEST, hm);
+
+    mbuf_remove(io, req_len);
+  }
+exit_mp:
+  ;
+}
+
+#define CONTENT_DISPOSITION "Content-Disposition: "
+
+static void mg_http_multipart_call_handler(struct mg_connection *c, int ev,
+                                           const char *data, size_t data_len) {
+  struct mg_http_multipart_part mp;
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(c);
+  memset(&mp, 0, sizeof(mp));
+
+  mp.var_name = pd->mp_stream.var_name;
+  mp.file_name = pd->mp_stream.file_name;
+  mp.user_data = pd->mp_stream.user_data;
+  mp.data.p = data;
+  mp.data.len = data_len;
+  mg_call(c, pd->endpoint_handler, ev, &mp);
+  pd->mp_stream.user_data = mp.user_data;
+}
+
+static int mg_http_multipart_got_chunk(struct mg_connection *c) {
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(c);
+  struct mbuf *io = &c->recv_mbuf;
+
+  mg_http_multipart_call_handler(c, MG_EV_HTTP_PART_DATA, io->buf,
+                                 pd->mp_stream.prev_io_len);
+  mbuf_remove(io, pd->mp_stream.prev_io_len);
+  pd->mp_stream.prev_io_len = 0;
+  pd->mp_stream.state = MPS_WAITING_FOR_CHUNK;
+
+  return 0;
+}
+
+static int mg_http_multipart_finalize(struct mg_connection *c) {
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(c);
+
+  mg_http_multipart_call_handler(c, MG_EV_HTTP_PART_END, NULL, 0);
+  MG_FREE((void *) pd->mp_stream.file_name);
+  pd->mp_stream.file_name = NULL;
+  MG_FREE((void *) pd->mp_stream.var_name);
+  pd->mp_stream.var_name = NULL;
+  mg_http_multipart_call_handler(c, MG_EV_HTTP_MULTIPART_REQUEST_END, NULL, 0);
+  mg_http_free_proto_data_mp_stream(&pd->mp_stream);
+  pd->mp_stream.state = MPS_FINISHED;
+
+  return 1;
+}
+
+static int mg_http_multipart_wait_for_boundary(struct mg_connection *c) {
+  const char *boundary;
+  struct mbuf *io = &c->recv_mbuf;
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(c);
+
+  if (pd->mp_stream.boundary == NULL) {
+    pd->mp_stream.state = MPS_FINALIZE;
+    DBG(("Invalid request: boundary not initialized"));
+    return 0;
+  }
+
+  if ((int) io->len < pd->mp_stream.boundary_len + 2) {
+    return 0;
+  }
+
+  boundary = c_strnstr(io->buf, pd->mp_stream.boundary, io->len);
+  if (boundary != NULL) {
+    const char *boundary_end = (boundary + pd->mp_stream.boundary_len);
+    if (io->len - (boundary_end - io->buf) < 4) {
+      return 0;
+    }
+    if (strncmp(boundary_end, "--\r\n", 4) == 0) {
+      pd->mp_stream.state = MPS_FINALIZE;
+      mbuf_remove(io, (boundary_end - io->buf) + 4);
+    } else {
+      pd->mp_stream.state = MPS_GOT_BOUNDARY;
+    }
+  } else {
+    return 0;
+  }
+
+  return 1;
+}
+
+static int mg_http_multipart_process_boundary(struct mg_connection *c) {
+  int data_size;
+  const char *boundary, *block_begin;
+  struct mbuf *io = &c->recv_mbuf;
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(c);
+  char file_name[100], var_name[100];
+  int line_len;
+  boundary = c_strnstr(io->buf, pd->mp_stream.boundary, io->len);
+  block_begin = boundary + pd->mp_stream.boundary_len + 2;
+  data_size = io->len - (block_begin - io->buf);
+
+  while (data_size > 0 &&
+         (line_len = mg_get_line_len(block_begin, data_size)) != 0) {
+    if (line_len > (int) sizeof(CONTENT_DISPOSITION) &&
+        mg_ncasecmp(block_begin, CONTENT_DISPOSITION,
+                    sizeof(CONTENT_DISPOSITION) - 1) == 0) {
+      struct mg_str header;
+
+      header.p = block_begin + sizeof(CONTENT_DISPOSITION) - 1;
+      header.len = line_len - sizeof(CONTENT_DISPOSITION) - 1;
+      mg_http_parse_header(&header, "name", var_name, sizeof(var_name) - 2);
+      mg_http_parse_header(&header, "filename", file_name,
+                           sizeof(file_name) - 2);
+      block_begin += line_len;
+      data_size -= line_len;
+      continue;
+    }
+
+    if (line_len == 2 && mg_ncasecmp(block_begin, "\r\n", 2) == 0) {
+      mbuf_remove(io, block_begin - io->buf + 2);
+
+      if (pd->mp_stream.processing_part != 0) {
+        mg_http_multipart_call_handler(c, MG_EV_HTTP_PART_END, NULL, 0);
+      }
+
+      MG_FREE((void *) pd->mp_stream.file_name);
+      pd->mp_stream.file_name = MG_STRDUP(file_name);
+      MG_FREE((void *) pd->mp_stream.var_name);
+      pd->mp_stream.var_name = MG_STRDUP(var_name);
+
+      mg_http_multipart_call_handler(c, MG_EV_HTTP_PART_BEGIN, NULL, 0);
+      pd->mp_stream.state = MPS_WAITING_FOR_CHUNK;
+      pd->mp_stream.processing_part++;
+      return 1;
+    }
+
+    block_begin += line_len;
+  }
+
+  pd->mp_stream.state = MPS_WAITING_FOR_BOUNDARY;
+
+  return 0;
+}
+
+static int mg_http_multipart_continue_wait_for_chunk(struct mg_connection *c) {
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(c);
+  struct mbuf *io = &c->recv_mbuf;
+
+  const char *boundary;
+  if ((int) io->len < pd->mp_stream.boundary_len + 6 /* \r\n, --, -- */) {
+    return 0;
+  }
+
+  boundary = c_strnstr(io->buf, pd->mp_stream.boundary, io->len);
+  if (boundary == NULL && pd->mp_stream.prev_io_len == 0) {
+    pd->mp_stream.prev_io_len = io->len;
+    return 0;
+  } else if (boundary == NULL &&
+             (int) io->len >
+                 pd->mp_stream.prev_io_len + pd->mp_stream.boundary_len + 4) {
+    pd->mp_stream.state = MPS_GOT_CHUNK;
+    return 1;
+  } else if (boundary != NULL) {
+    int data_size = (boundary - io->buf - 4);
+    mg_http_multipart_call_handler(c, MG_EV_HTTP_PART_DATA, io->buf, data_size);
+    mbuf_remove(io, (boundary - io->buf));
+    pd->mp_stream.prev_io_len = 0;
+    pd->mp_stream.state = MPS_WAITING_FOR_BOUNDARY;
+    return 1;
+  } else {
+    return 0;
+  }
+}
+
+static void mg_http_multipart_continue(struct mg_connection *c) {
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(c);
+  while (1) {
+    switch (pd->mp_stream.state) {
+      case MPS_BEGIN: {
+        pd->mp_stream.state = MPS_WAITING_FOR_BOUNDARY;
+        break;
+      }
+      case MPS_WAITING_FOR_BOUNDARY: {
+        if (mg_http_multipart_wait_for_boundary(c) == 0) {
+          return;
+        }
+        break;
+      }
+      case MPS_GOT_BOUNDARY: {
+        if (mg_http_multipart_process_boundary(c) == 0) {
+          return;
+        }
+        break;
+      }
+      case MPS_WAITING_FOR_CHUNK: {
+        if (mg_http_multipart_continue_wait_for_chunk(c) == 0) {
+          return;
+        }
+        break;
+      }
+      case MPS_GOT_CHUNK: {
+        if (mg_http_multipart_got_chunk(c) == 0) {
+          return;
+        }
+        break;
+      }
+      case MPS_FINALIZE: {
+        if (mg_http_multipart_finalize(c) == 0) {
+          return;
+        }
+        break;
+      }
+      case MPS_FINISHED: {
+        mbuf_remove(&c->recv_mbuf, c->recv_mbuf.len);
+        return;
+      }
+    }
+  }
+}
+
+struct file_upload_state {
+  char *lfn;
+  size_t num_recd;
+  FILE *fp;
+};
+
+#endif /* MG_ENABLE_HTTP_STREAMING_MULTIPART */
+
+void mg_set_protocol_http_websocket(struct mg_connection *nc) {
+  nc->proto_handler = mg_http_handler;
+}
+
+const char *mg_status_message(int status_code) {
+  switch (status_code) {
+    case 206:
+      return "Partial Content";
+    case 301:
+      return "Moved";
+    case 302:
+      return "Found";
+    case 400:
+      return "Bad Request";
+    case 401:
+      return "Unauthorized";
+    case 403:
+      return "Forbidden";
+    case 404:
+      return "Not Found";
+    case 416:
+      return "Requested Range Not Satisfiable";
+    case 418:
+      return "I'm a teapot";
+    case 500:
+      return "Internal Server Error";
+    case 502:
+      return "Bad Gateway";
+    case 503:
+      return "Service Unavailable";
+
+#if MG_ENABLE_EXTRA_ERRORS_DESC
+    case 100:
+      return "Continue";
+    case 101:
+      return "Switching Protocols";
+    case 102:
+      return "Processing";
+    case 200:
+      return "OK";
+    case 201:
+      return "Created";
+    case 202:
+      return "Accepted";
+    case 203:
+      return "Non-Authoritative Information";
+    case 204:
+      return "No Content";
+    case 205:
+      return "Reset Content";
+    case 207:
+      return "Multi-Status";
+    case 208:
+      return "Already Reported";
+    case 226:
+      return "IM Used";
+    case 300:
+      return "Multiple Choices";
+    case 303:
+      return "See Other";
+    case 304:
+      return "Not Modified";
+    case 305:
+      return "Use Proxy";
+    case 306:
+      return "Switch Proxy";
+    case 307:
+      return "Temporary Redirect";
+    case 308:
+      return "Permanent Redirect";
+    case 402:
+      return "Payment Required";
+    case 405:
+      return "Method Not Allowed";
+    case 406:
+      return "Not Acceptable";
+    case 407:
+      return "Proxy Authentication Required";
+    case 408:
+      return "Request Timeout";
+    case 409:
+      return "Conflict";
+    case 410:
+      return "Gone";
+    case 411:
+      return "Length Required";
+    case 412:
+      return "Precondition Failed";
+    case 413:
+      return "Payload Too Large";
+    case 414:
+      return "URI Too Long";
+    case 415:
+      return "Unsupported Media Type";
+    case 417:
+      return "Expectation Failed";
+    case 422:
+      return "Unprocessable Entity";
+    case 423:
+      return "Locked";
+    case 424:
+      return "Failed Dependency";
+    case 426:
+      return "Upgrade Required";
+    case 428:
+      return "Precondition Required";
+    case 429:
+      return "Too Many Requests";
+    case 431:
+      return "Request Header Fields Too Large";
+    case 451:
+      return "Unavailable For Legal Reasons";
+    case 501:
+      return "Not Implemented";
+    case 504:
+      return "Gateway Timeout";
+    case 505:
+      return "HTTP Version Not Supported";
+    case 506:
+      return "Variant Also Negotiates";
+    case 507:
+      return "Insufficient Storage";
+    case 508:
+      return "Loop Detected";
+    case 510:
+      return "Not Extended";
+    case 511:
+      return "Network Authentication Required";
+#endif /* MG_ENABLE_EXTRA_ERRORS_DESC */
+
+    default:
+      return "OK";
+  }
+}
+
+void mg_send_response_line_s(struct mg_connection *nc, int status_code,
+                             const struct mg_str extra_headers) {
+  mg_printf(nc, "HTTP/1.1 %d %s\r\nServer: %s\r\n", status_code,
+            mg_status_message(status_code), mg_version_header);
+  if (extra_headers.len > 0) {
+    mg_printf(nc, "%.*s\r\n", (int) extra_headers.len, extra_headers.p);
+  }
+}
+
+void mg_send_response_line(struct mg_connection *nc, int status_code,
+                           const char *extra_headers) {
+  mg_send_response_line_s(nc, status_code, mg_mk_str(extra_headers));
+}
+
+void mg_http_send_redirect(struct mg_connection *nc, int status_code,
+                           const struct mg_str location,
+                           const struct mg_str extra_headers) {
+  char bbody[100], *pbody = bbody;
+  int bl = mg_asprintf(&pbody, sizeof(bbody),
+                       "<p>Moved <a href='%.*s'>here</a>.\r\n",
+                       (int) location.len, location.p);
+  char bhead[150], *phead = bhead;
+  mg_asprintf(&phead, sizeof(bhead),
+              "Location: %.*s\r\n"
+              "Content-Type: text/html\r\n"
+              "Content-Length: %d\r\n"
+              "Cache-Control: no-cache\r\n"
+              "%.*s%s",
+              (int) location.len, location.p, bl, (int) extra_headers.len,
+              extra_headers.p, (extra_headers.len > 0 ? "\r\n" : ""));
+  mg_send_response_line(nc, status_code, phead);
+  if (phead != bhead) MG_FREE(phead);
+  mg_send(nc, pbody, bl);
+  if (pbody != bbody) MG_FREE(pbody);
+}
+
+void mg_send_head(struct mg_connection *c, int status_code,
+                  int64_t content_length, const char *extra_headers) {
+  mg_send_response_line(c, status_code, extra_headers);
+  if (content_length < 0) {
+    mg_printf(c, "%s", "Transfer-Encoding: chunked\r\n");
+  } else {
+    mg_printf(c, "Content-Length: %" INT64_FMT "\r\n", content_length);
+  }
+  mg_send(c, "\r\n", 2);
+}
+
+void mg_http_send_error(struct mg_connection *nc, int code,
+                        const char *reason) {
+  if (!reason) reason = mg_status_message(code);
+  LOG(LL_DEBUG, ("%p %d %s", nc, code, reason));
+  mg_send_head(nc, code, strlen(reason),
+               "Content-Type: text/plain\r\nConnection: close");
+  mg_send(nc, reason, strlen(reason));
+  nc->flags |= MG_F_SEND_AND_CLOSE;
+}
+
+#if MG_ENABLE_FILESYSTEM
+static void mg_http_construct_etag(char *buf, size_t buf_len,
+                                   const cs_stat_t *st) {
+  snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"", (unsigned long) st->st_mtime,
+           (int64_t) st->st_size);
+}
+
+#ifndef WINCE
+static void mg_gmt_time_string(char *buf, size_t buf_len, time_t *t) {
+  strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
+}
+#else
+/* Look wince_lib.c for WindowsCE implementation */
+static void mg_gmt_time_string(char *buf, size_t buf_len, time_t *t);
+#endif
+
+static int mg_http_parse_range_header(const struct mg_str *header, int64_t *a,
+                                      int64_t *b) {
+  /*
+   * There is no snscanf. Headers are not guaranteed to be NUL-terminated,
+   * so we have this. Ugh.
+   */
+  int result;
+  char *p = (char *) MG_MALLOC(header->len + 1);
+  if (p == NULL) return 0;
+  memcpy(p, header->p, header->len);
+  p[header->len] = '\0';
+  result = sscanf(p, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
+  MG_FREE(p);
+  return result;
+}
+
+void mg_http_serve_file(struct mg_connection *nc, struct http_message *hm,
+                        const char *path, const struct mg_str mime_type,
+                        const struct mg_str extra_headers) {
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
+  cs_stat_t st;
+  LOG(LL_DEBUG, ("%p [%s] %.*s", nc, path, (int) mime_type.len, mime_type.p));
+  if (mg_stat(path, &st) != 0 || (pd->file.fp = mg_fopen(path, "rb")) == NULL) {
+    int code, err = mg_get_errno();
+    switch (err) {
+      case EACCES:
+        code = 403;
+        break;
+      case ENOENT:
+        code = 404;
+        break;
+      default:
+        code = 500;
+    };
+    mg_http_send_error(nc, code, "Open failed");
+  } else {
+    char etag[50], current_time[50], last_modified[50], range[70];
+    time_t t = (time_t) mg_time();
+    int64_t r1 = 0, r2 = 0, cl = st.st_size;
+    struct mg_str *range_hdr = mg_get_http_header(hm, "Range");
+    int n, status_code = 200;
+
+    /* Handle Range header */
+    range[0] = '\0';
+    if (range_hdr != NULL &&
+        (n = mg_http_parse_range_header(range_hdr, &r1, &r2)) > 0 && r1 >= 0 &&
+        r2 >= 0) {
+      /* If range is specified like "400-", set second limit to content len */
+      if (n == 1) {
+        r2 = cl - 1;
+      }
+      if (r1 > r2 || r2 >= cl) {
+        status_code = 416;
+        cl = 0;
+        snprintf(range, sizeof(range),
+                 "Content-Range: bytes */%" INT64_FMT "\r\n",
+                 (int64_t) st.st_size);
+      } else {
+        status_code = 206;
+        cl = r2 - r1 + 1;
+        snprintf(range, sizeof(range), "Content-Range: bytes %" INT64_FMT
+                                       "-%" INT64_FMT "/%" INT64_FMT "\r\n",
+                 r1, r1 + cl - 1, (int64_t) st.st_size);
+#if _FILE_OFFSET_BITS == 64 || _POSIX_C_SOURCE >= 200112L || \
+    _XOPEN_SOURCE >= 600
+        fseeko(pd->file.fp, r1, SEEK_SET);
+#else
+        fseek(pd->file.fp, (long) r1, SEEK_SET);
+#endif
+      }
+    }
+
+#if !MG_DISABLE_HTTP_KEEP_ALIVE
+    {
+      struct mg_str *conn_hdr = mg_get_http_header(hm, "Connection");
+      if (conn_hdr != NULL) {
+        pd->file.keepalive = (mg_vcasecmp(conn_hdr, "keep-alive") == 0);
+      } else {
+        pd->file.keepalive = (mg_vcmp(&hm->proto, "HTTP/1.1") == 0);
+      }
+    }
+#endif
+
+    mg_http_construct_etag(etag, sizeof(etag), &st);
+    mg_gmt_time_string(current_time, sizeof(current_time), &t);
+    mg_gmt_time_string(last_modified, sizeof(last_modified), &st.st_mtime);
+    /*
+     * Content length casted to size_t because:
+     * 1) that's the maximum buffer size anyway
+     * 2) ESP8266 RTOS SDK newlib vprintf cannot contain a 64bit arg at non-last
+     *    position
+     * TODO(mkm): fix ESP8266 RTOS SDK
+     */
+    mg_send_response_line_s(nc, status_code, extra_headers);
+    mg_printf(nc,
+              "Date: %s\r\n"
+              "Last-Modified: %s\r\n"
+              "Accept-Ranges: bytes\r\n"
+              "Content-Type: %.*s\r\n"
+              "Connection: %s\r\n"
+              "Content-Length: %" SIZE_T_FMT
+              "\r\n"
+              "%sEtag: %s\r\n\r\n",
+              current_time, last_modified, (int) mime_type.len, mime_type.p,
+              (pd->file.keepalive ? "keep-alive" : "close"), (size_t) cl, range,
+              etag);
+
+    pd->file.cl = cl;
+    pd->file.type = DATA_FILE;
+    mg_http_transfer_file_data(nc);
+  }
+}
+
+static void mg_http_serve_file2(struct mg_connection *nc, const char *path,
+                                struct http_message *hm,
+                                struct mg_serve_http_opts *opts) {
+#if MG_ENABLE_HTTP_SSI
+  if (mg_match_prefix(opts->ssi_pattern, strlen(opts->ssi_pattern), path) > 0) {
+    mg_handle_ssi_request(nc, hm, path, opts);
+    return;
+  }
+#endif
+  mg_http_serve_file(nc, hm, path, mg_get_mime_type(path, "text/plain", opts),
+                     mg_mk_str(opts->extra_headers));
+}
+
+#endif
+
+int mg_url_decode(const char *src, int src_len, char *dst, int dst_len,
+                  int is_form_url_encoded) {
+  int i, j, a, b;
+#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
+
+  for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
+    if (src[i] == '%') {
+      if (i < src_len - 2 && isxdigit(*(const unsigned char *) (src + i + 1)) &&
+          isxdigit(*(const unsigned char *) (src + i + 2))) {
+        a = tolower(*(const unsigned char *) (src + i + 1));
+        b = tolower(*(const unsigned char *) (src + i + 2));
+        dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
+        i += 2;
+      } else {
+        return -1;
+      }
+    } else if (is_form_url_encoded && src[i] == '+') {
+      dst[j] = ' ';
+    } else {
+      dst[j] = src[i];
+    }
+  }
+
+  dst[j] = '\0'; /* Null-terminate the destination */
+
+  return i >= src_len ? j : -1;
+}
+
+int mg_get_http_var(const struct mg_str *buf, const char *name, char *dst,
+                    size_t dst_len) {
+  const char *p, *e, *s;
+  size_t name_len;
+  int len;
+
+  if (dst == NULL || dst_len == 0) {
+    len = -2;
+  } else if (buf->p == NULL || name == NULL || buf->len == 0) {
+    len = -1;
+    dst[0] = '\0';
+  } else {
+    name_len = strlen(name);
+    e = buf->p + buf->len;
+    len = -1;
+    dst[0] = '\0';
+
+    for (p = buf->p; p + name_len < e; p++) {
+      if ((p == buf->p || p[-1] == '&') && p[name_len] == '=' &&
+          !mg_ncasecmp(name, p, name_len)) {
+        p += name_len + 1;
+        s = (const char *) memchr(p, '&', (size_t)(e - p));
+        if (s == NULL) {
+          s = e;
+        }
+        len = mg_url_decode(p, (size_t)(s - p), dst, dst_len, 1);
+        if (len == -1) {
+          len = -2;
+        }
+        break;
+      }
+    }
+  }
+
+  return len;
+}
+
+void mg_send_http_chunk(struct mg_connection *nc, const char *buf, size_t len) {
+  char chunk_size[50];
+  int n;
+
+  n = snprintf(chunk_size, sizeof(chunk_size), "%lX\r\n", (unsigned long) len);
+  mg_send(nc, chunk_size, n);
+  mg_send(nc, buf, len);
+  mg_send(nc, "\r\n", 2);
+}
+
+void mg_printf_http_chunk(struct mg_connection *nc, const char *fmt, ...) {
+  char mem[MG_VPRINTF_BUFFER_SIZE], *buf = mem;
+  int len;
+  va_list ap;
+
+  va_start(ap, fmt);
+  len = mg_avprintf(&buf, sizeof(mem), fmt, ap);
+  va_end(ap);
+
+  if (len >= 0) {
+    mg_send_http_chunk(nc, buf, len);
+  }
+
+  /* LCOV_EXCL_START */
+  if (buf != mem && buf != NULL) {
+    MG_FREE(buf);
+  }
+  /* LCOV_EXCL_STOP */
+}
+
+void mg_printf_html_escape(struct mg_connection *nc, const char *fmt, ...) {
+  char mem[MG_VPRINTF_BUFFER_SIZE], *buf = mem;
+  int i, j, len;
+  va_list ap;
+
+  va_start(ap, fmt);
+  len = mg_avprintf(&buf, sizeof(mem), fmt, ap);
+  va_end(ap);
+
+  if (len >= 0) {
+    for (i = j = 0; i < len; i++) {
+      if (buf[i] == '<' || buf[i] == '>') {
+        mg_send(nc, buf + j, i - j);
+        mg_send(nc, buf[i] == '<' ? "&lt;" : "&gt;", 4);
+        j = i + 1;
+      }
+    }
+    mg_send(nc, buf + j, i - j);
+  }
+
+  /* LCOV_EXCL_START */
+  if (buf != mem && buf != NULL) {
+    MG_FREE(buf);
+  }
+  /* LCOV_EXCL_STOP */
+}
+
+int mg_http_parse_header(struct mg_str *hdr, const char *var_name, char *buf,
+                         size_t buf_size) {
+  int ch = ' ', ch1 = ',', len = 0, n = strlen(var_name);
+  const char *p, *end = hdr ? hdr->p + hdr->len : NULL, *s = NULL;
+
+  if (buf != NULL && buf_size > 0) buf[0] = '\0';
+  if (hdr == NULL) return 0;
+
+  /* Find where variable starts */
+  for (s = hdr->p; s != NULL && s + n < end; s++) {
+    if ((s == hdr->p || s[-1] == ch || s[-1] == ch1 || s[-1] == ';') &&
+        s[n] == '=' && !strncmp(s, var_name, n))
+      break;
+  }
+
+  if (s != NULL && &s[n + 1] < end) {
+    s += n + 1;
+    if (*s == '"' || *s == '\'') {
+      ch = ch1 = *s++;
+    }
+    p = s;
+    while (p < end && p[0] != ch && p[0] != ch1 && len < (int) buf_size) {
+      if (ch != ' ' && p[0] == '\\' && p[1] == ch) p++;
+      buf[len++] = *p++;
+    }
+    if (len >= (int) buf_size || (ch != ' ' && *p != ch)) {
+      len = 0;
+    } else {
+      if (len > 0 && s[len - 1] == ',') len--;
+      if (len > 0 && s[len - 1] == ';') len--;
+      buf[len] = '\0';
+    }
+  }
+
+  return len;
+}
+
+int mg_get_http_basic_auth(struct http_message *hm, char *user, size_t user_len,
+                           char *pass, size_t pass_len) {
+  struct mg_str *hdr = mg_get_http_header(hm, "Authorization");
+  if (hdr == NULL) return -1;
+  return mg_parse_http_basic_auth(hdr, user, user_len, pass, pass_len);
+}
+
+int mg_parse_http_basic_auth(struct mg_str *hdr, char *user, size_t user_len,
+                             char *pass, size_t pass_len) {
+  char *buf = NULL;
+  char fmt[64];
+  int res = 0;
+
+  if (mg_strncmp(*hdr, mg_mk_str("Basic "), 6) != 0) return -1;
+
+  buf = (char *) MG_MALLOC(hdr->len);
+  cs_base64_decode((unsigned char *) hdr->p + 6, hdr->len, buf, NULL);
+
+  /* e.g. "%123[^:]:%321[^\n]" */
+  snprintf(fmt, sizeof(fmt), "%%%" SIZE_T_FMT "[^:]:%%%" SIZE_T_FMT "[^\n]",
+           user_len - 1, pass_len - 1);
+  if (sscanf(buf, fmt, user, pass) == 0) {
+    res = -1;
+  }
+
+  MG_FREE(buf);
+  return res;
+}
+
+#if MG_ENABLE_FILESYSTEM
+static int mg_is_file_hidden(const char *path,
+                             const struct mg_serve_http_opts *opts,
+                             int exclude_specials) {
+  const char *p1 = opts->per_directory_auth_file;
+  const char *p2 = opts->hidden_file_pattern;
+
+  /* Strip directory path from the file name */
+  const char *pdir = strrchr(path, DIRSEP);
+  if (pdir != NULL) {
+    path = pdir + 1;
+  }
+
+  return (exclude_specials && (!strcmp(path, ".") || !strcmp(path, ".."))) ||
+         (p1 != NULL &&
+          mg_match_prefix(p1, strlen(p1), path) == (int) strlen(p1)) ||
+         (p2 != NULL && mg_match_prefix(p2, strlen(p2), path) > 0);
+}
+
+#if !MG_DISABLE_HTTP_DIGEST_AUTH
+static void mg_mkmd5resp(const char *method, size_t method_len, const char *uri,
+                         size_t uri_len, const char *ha1, size_t ha1_len,
+                         const char *nonce, size_t nonce_len, const char *nc,
+                         size_t nc_len, const char *cnonce, size_t cnonce_len,
+                         const char *qop, size_t qop_len, char *resp) {
+  static const char colon[] = ":";
+  static const size_t one = 1;
+  char ha2[33];
+
+  cs_md5(ha2, method, method_len, colon, one, uri, uri_len, NULL);
+  cs_md5(resp, ha1, ha1_len, colon, one, nonce, nonce_len, colon, one, nc,
+         nc_len, colon, one, cnonce, cnonce_len, colon, one, qop, qop_len,
+         colon, one, ha2, sizeof(ha2) - 1, NULL);
+}
+
+int mg_http_create_digest_auth_header(char *buf, size_t buf_len,
+                                      const char *method, const char *uri,
+                                      const char *auth_domain, const char *user,
+                                      const char *passwd) {
+  static const char colon[] = ":", qop[] = "auth";
+  static const size_t one = 1;
+  char ha1[33], resp[33], cnonce[40];
+
+  snprintf(cnonce, sizeof(cnonce), "%x", (unsigned int) mg_time());
+  cs_md5(ha1, user, (size_t) strlen(user), colon, one, auth_domain,
+         (size_t) strlen(auth_domain), colon, one, passwd,
+         (size_t) strlen(passwd), NULL);
+  mg_mkmd5resp(method, strlen(method), uri, strlen(uri), ha1, sizeof(ha1) - 1,
+               cnonce, strlen(cnonce), "1", one, cnonce, strlen(cnonce), qop,
+               sizeof(qop) - 1, resp);
+  return snprintf(buf, buf_len,
+                  "Authorization: Digest username=\"%s\","
+                  "realm=\"%s\",uri=\"%s\",qop=%s,nc=1,cnonce=%s,"
+                  "nonce=%s,response=%s\r\n",
+                  user, auth_domain, uri, qop, cnonce, cnonce, resp);
+}
+
+/*
+ * Check for authentication timeout.
+ * Clients send time stamp encoded in nonce. Make sure it is not too old,
+ * to prevent replay attacks.
+ * Assumption: nonce is a hexadecimal number of seconds since 1970.
+ */
+static int mg_check_nonce(const char *nonce) {
+  unsigned long now = (unsigned long) mg_time();
+  unsigned long val = (unsigned long) strtoul(nonce, NULL, 16);
+  return now < val || now - val < 3600;
+}
+
+int mg_http_check_digest_auth(struct http_message *hm, const char *auth_domain,
+                              FILE *fp) {
+  struct mg_str *hdr;
+  char buf[128], f_user[sizeof(buf)], f_ha1[sizeof(buf)], f_domain[sizeof(buf)];
+  char user[50], cnonce[33], response[40], uri[200], qop[20], nc[20], nonce[30];
+  char expected_response[33];
+
+  /* Parse "Authorization:" header, fail fast on parse error */
+  if (hm == NULL || fp == NULL ||
+      (hdr = mg_get_http_header(hm, "Authorization")) == NULL ||
+      mg_http_parse_header(hdr, "username", user, sizeof(user)) == 0 ||
+      mg_http_parse_header(hdr, "cnonce", cnonce, sizeof(cnonce)) == 0 ||
+      mg_http_parse_header(hdr, "response", response, sizeof(response)) == 0 ||
+      mg_http_parse_header(hdr, "uri", uri, sizeof(uri)) == 0 ||
+      mg_http_parse_header(hdr, "qop", qop, sizeof(qop)) == 0 ||
+      mg_http_parse_header(hdr, "nc", nc, sizeof(nc)) == 0 ||
+      mg_http_parse_header(hdr, "nonce", nonce, sizeof(nonce)) == 0 ||
+      mg_check_nonce(nonce) == 0) {
+    return 0;
+  }
+
+  /*
+   * Read passwords file line by line. If should have htdigest format,
+   * i.e. each line should be a colon-separated sequence:
+   * USER_NAME:DOMAIN_NAME:HA1_HASH_OF_USER_DOMAIN_AND_PASSWORD
+   */
+  while (fgets(buf, sizeof(buf), fp) != NULL) {
+    if (sscanf(buf, "%[^:]:%[^:]:%s", f_user, f_domain, f_ha1) == 3 &&
+        strcmp(user, f_user) == 0 &&
+        /* NOTE(lsm): due to a bug in MSIE, we do not compare URIs */
+        strcmp(auth_domain, f_domain) == 0) {
+      /* User and domain matched, check the password */
+      mg_mkmd5resp(
+          hm->method.p, hm->method.len, hm->uri.p,
+          hm->uri.len + (hm->query_string.len ? hm->query_string.len + 1 : 0),
+          f_ha1, strlen(f_ha1), nonce, strlen(nonce), nc, strlen(nc), cnonce,
+          strlen(cnonce), qop, strlen(qop), expected_response);
+      return mg_casecmp(response, expected_response) == 0;
+    }
+  }
+
+  /* None of the entries in the passwords file matched - return failure */
+  return 0;
+}
+
+static int mg_is_authorized(struct http_message *hm, const char *path,
+                            int is_directory, const char *domain,
+                            const char *passwords_file,
+                            int is_global_pass_file) {
+  char buf[MG_MAX_PATH];
+  const char *p;
+  FILE *fp;
+  int authorized = 1;
+
+  if (domain != NULL && passwords_file != NULL) {
+    if (is_global_pass_file) {
+      fp = mg_fopen(passwords_file, "r");
+    } else if (is_directory) {
+      snprintf(buf, sizeof(buf), "%s%c%s", path, DIRSEP, passwords_file);
+      fp = mg_fopen(buf, "r");
+    } else {
+      p = strrchr(path, DIRSEP);
+      if (p == NULL) p = path;
+      snprintf(buf, sizeof(buf), "%.*s%c%s", (int) (p - path), path, DIRSEP,
+               passwords_file);
+      fp = mg_fopen(buf, "r");
+    }
+
+    if (fp != NULL) {
+      authorized = mg_http_check_digest_auth(hm, domain, fp);
+      fclose(fp);
+    }
+  }
+
+  LOG(LL_DEBUG, ("%s '%s' %d %d", path, passwords_file ? passwords_file : "",
+                 is_global_pass_file, authorized));
+  return authorized;
+}
+#else
+static int mg_is_authorized(struct http_message *hm, const char *path,
+                            int is_directory, const char *domain,
+                            const char *passwords_file,
+                            int is_global_pass_file) {
+  (void) hm;
+  (void) path;
+  (void) is_directory;
+  (void) domain;
+  (void) passwords_file;
+  (void) is_global_pass_file;
+  return 1;
+}
+#endif
+
+#if MG_ENABLE_DIRECTORY_LISTING
+static size_t mg_url_encode(const char *src, size_t s_len, char *dst,
+                            size_t dst_len) {
+  static const char *dont_escape = "._-$,;~()/";
+  static const char *hex = "0123456789abcdef";
+  size_t i = 0, j = 0;
+
+  for (i = j = 0; dst_len > 0 && i < s_len && j + 2 < dst_len - 1; i++, j++) {
+    if (isalnum(*(const unsigned char *) (src + i)) ||
+        strchr(dont_escape, *(const unsigned char *) (src + i)) != NULL) {
+      dst[j] = src[i];
+    } else if (j + 3 < dst_len) {
+      dst[j] = '%';
+      dst[j + 1] = hex[(*(const unsigned char *) (src + i)) >> 4];
+      dst[j + 2] = hex[(*(const unsigned char *) (src + i)) & 0xf];
+      j += 2;
+    }
+  }
+
+  dst[j] = '\0';
+  return j;
+}
+
+static void mg_escape(const char *src, char *dst, size_t dst_len) {
+  size_t n = 0;
+  while (*src != '\0' && n + 5 < dst_len) {
+    unsigned char ch = *(unsigned char *) src++;
+    if (ch == '<') {
+      n += snprintf(dst + n, dst_len - n, "%s", "&lt;");
+    } else {
+      dst[n++] = ch;
+    }
+  }
+  dst[n] = '\0';
+}
+
+static void mg_print_dir_entry(struct mg_connection *nc, const char *file_name,
+                               cs_stat_t *stp) {
+  char size[64], mod[64], href[MAX_PATH_SIZE * 3], path[MAX_PATH_SIZE];
+  int64_t fsize = stp->st_size;
+  int is_dir = S_ISDIR(stp->st_mode);
+  const char *slash = is_dir ? "/" : "";
+
+  if (is_dir) {
+    snprintf(size, sizeof(size), "%s", "[DIRECTORY]");
+  } else {
+    /*
+     * We use (double) cast below because MSVC 6 compiler cannot
+     * convert unsigned __int64 to double.
+     */
+    if (fsize < 1024) {
+      snprintf(size, sizeof(size), "%d", (int) fsize);
+    } else if (fsize < 0x100000) {
+      snprintf(size, sizeof(size), "%.1fk", (double) fsize / 1024.0);
+    } else if (fsize < 0x40000000) {
+      snprintf(size, sizeof(size), "%.1fM", (double) fsize / 1048576);
+    } else {
+      snprintf(size, sizeof(size), "%.1fG", (double) fsize / 1073741824);
+    }
+  }
+  strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", localtime(&stp->st_mtime));
+  mg_escape(file_name, path, sizeof(path));
+  mg_url_encode(file_name, strlen(file_name), href, sizeof(href));
+  mg_printf_http_chunk(nc,
+                       "<tr><td><a href=\"%s%s\">%s%s</a></td>"
+                       "<td>%s</td><td name=%" INT64_FMT ">%s</td></tr>\n",
+                       href, slash, path, slash, mod, is_dir ? -1 : fsize,
+                       size);
+}
+
+static void mg_scan_directory(struct mg_connection *nc, const char *dir,
+                              const struct mg_serve_http_opts *opts,
+                              void (*func)(struct mg_connection *, const char *,
+                                           cs_stat_t *)) {
+  char path[MAX_PATH_SIZE];
+  cs_stat_t st;
+  struct dirent *dp;
+  DIR *dirp;
+
+  LOG(LL_DEBUG, ("%p [%s]", nc, dir));
+  if ((dirp = (opendir(dir))) != NULL) {
+    while ((dp = readdir(dirp)) != NULL) {
+      /* Do not show current dir and hidden files */
+      if (mg_is_file_hidden((const char *) dp->d_name, opts, 1)) {
+        continue;
+      }
+      snprintf(path, sizeof(path), "%s/%s", dir, dp->d_name);
+      if (mg_stat(path, &st) == 0) {
+        func(nc, (const char *) dp->d_name, &st);
+      }
+    }
+    closedir(dirp);
+  } else {
+    LOG(LL_DEBUG, ("%p opendir(%s) -> %d", nc, dir, mg_get_errno()));
+  }
+}
+
+static void mg_send_directory_listing(struct mg_connection *nc, const char *dir,
+                                      struct http_message *hm,
+                                      struct mg_serve_http_opts *opts) {
+  static const char *sort_js_code =
+      "<script>function srt(tb, sc, so, d) {"
+      "var tr = Array.prototype.slice.call(tb.rows, 0),"
+      "tr = tr.sort(function (a, b) { var c1 = a.cells[sc], c2 = b.cells[sc],"
+      "n1 = c1.getAttribute('name'), n2 = c2.getAttribute('name'), "
+      "t1 = a.cells[2].getAttribute('name'), "
+      "t2 = b.cells[2].getAttribute('name'); "
+      "return so * (t1 < 0 && t2 >= 0 ? -1 : t2 < 0 && t1 >= 0 ? 1 : "
+      "n1 ? parseInt(n2) - parseInt(n1) : "
+      "c1.textContent.trim().localeCompare(c2.textContent.trim())); });";
+  static const char *sort_js_code2 =
+      "for (var i = 0; i < tr.length; i++) tb.appendChild(tr[i]); "
+      "if (!d) window.location.hash = ('sc=' + sc + '&so=' + so); "
+      "};"
+      "window.onload = function() {"
+      "var tb = document.getElementById('tb');"
+      "var m = /sc=([012]).so=(1|-1)/.exec(window.location.hash) || [0, 2, 1];"
+      "var sc = m[1], so = m[2]; document.onclick = function(ev) { "
+      "var c = ev.target.rel; if (c) {if (c == sc) so *= -1; srt(tb, c, so); "
+      "sc = c; ev.preventDefault();}};"
+      "srt(tb, sc, so, true);"
+      "}"
+      "</script>";
+
+  mg_send_response_line(nc, 200, opts->extra_headers);
+  mg_printf(nc, "%s: %s\r\n%s: %s\r\n\r\n", "Transfer-Encoding", "chunked",
+            "Content-Type", "text/html; charset=utf-8");
+
+  mg_printf_http_chunk(
+      nc,
+      "<html><head><title>Index of %.*s</title>%s%s"
+      "<style>th,td {text-align: left; padding-right: 1em; "
+      "font-family: monospace; }</style></head>\n"
+      "<body><h1>Index of %.*s</h1>\n<table cellpadding=0><thead>"
+      "<tr><th><a href=# rel=0>Name</a></th><th>"
+      "<a href=# rel=1>Modified</a</th>"
+      "<th><a href=# rel=2>Size</a></th></tr>"
+      "<tr><td colspan=3><hr></td></tr>\n"
+      "</thead>\n"
+      "<tbody id=tb>",
+      (int) hm->uri.len, hm->uri.p, sort_js_code, sort_js_code2,
+      (int) hm->uri.len, hm->uri.p);
+  mg_scan_directory(nc, dir, opts, mg_print_dir_entry);
+  mg_printf_http_chunk(nc,
+                       "</tbody><tr><td colspan=3><hr></td></tr>\n"
+                       "</table>\n"
+                       "<address>%s</address>\n"
+                       "</body></html>",
+                       mg_version_header);
+  mg_send_http_chunk(nc, "", 0);
+  /* TODO(rojer): Remove when cesanta/dev/issues/197 is fixed. */
+  nc->flags |= MG_F_SEND_AND_CLOSE;
+}
+#endif /* MG_ENABLE_DIRECTORY_LISTING */
+
+/*
+ * Given a directory path, find one of the files specified in the
+ * comma-separated list of index files `list`.
+ * First found index file wins. If an index file is found, then gets
+ * appended to the `path`, stat-ed, and result of `stat()` passed to `stp`.
+ * If index file is not found, then `path` and `stp` remain unchanged.
+ */
+MG_INTERNAL void mg_find_index_file(const char *path, const char *list,
+                                    char **index_file, cs_stat_t *stp) {
+  struct mg_str vec;
+  size_t path_len = strlen(path);
+  int found = 0;
+  *index_file = NULL;
+
+  /* Traverse index files list. For each entry, append it to the given */
+  /* path and see if the file exists. If it exists, break the loop */
+  while ((list = mg_next_comma_list_entry(list, &vec, NULL)) != NULL) {
+    cs_stat_t st;
+    size_t len = path_len + 1 + vec.len + 1;
+    *index_file = (char *) MG_REALLOC(*index_file, len);
+    if (*index_file == NULL) break;
+    snprintf(*index_file, len, "%s%c%.*s", path, DIRSEP, (int) vec.len, vec.p);
+
+    /* Does it exist? Is it a file? */
+    if (mg_stat(*index_file, &st) == 0 && S_ISREG(st.st_mode)) {
+      /* Yes it does, break the loop */
+      *stp = st;
+      found = 1;
+      break;
+    }
+  }
+  if (!found) {
+    MG_FREE(*index_file);
+    *index_file = NULL;
+  }
+  LOG(LL_DEBUG, ("[%s] [%s]", path, (*index_file ? *index_file : "")));
+}
+
+#if MG_ENABLE_HTTP_URL_REWRITES
+static int mg_http_send_port_based_redirect(
+    struct mg_connection *c, struct http_message *hm,
+    const struct mg_serve_http_opts *opts) {
+  const char *rewrites = opts->url_rewrites;
+  struct mg_str a, b;
+  char local_port[20] = {'%'};
+
+  mg_conn_addr_to_str(c, local_port + 1, sizeof(local_port) - 1,
+                      MG_SOCK_STRINGIFY_PORT);
+
+  while ((rewrites = mg_next_comma_list_entry(rewrites, &a, &b)) != NULL) {
+    if (mg_vcmp(&a, local_port) == 0) {
+      mg_send_response_line(c, 301, NULL);
+      mg_printf(c, "Content-Length: 0\r\nLocation: %.*s%.*s\r\n\r\n",
+                (int) b.len, b.p, (int) (hm->proto.p - hm->uri.p - 1),
+                hm->uri.p);
+      return 1;
+    }
+  }
+
+  return 0;
+}
+
+static void mg_reverse_proxy_handler(struct mg_connection *nc, int ev,
+                                     void *ev_data) {
+  struct http_message *hm = (struct http_message *) ev_data;
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
+
+  if (pd == NULL || pd->reverse_proxy_data.linked_conn == NULL) {
+    DBG(("%p: upstream closed", nc));
+    return;
+  }
+
+  switch (ev) {
+    case MG_EV_CONNECT:
+      if (*(int *) ev_data != 0) {
+        mg_http_send_error(pd->reverse_proxy_data.linked_conn, 502, NULL);
+      }
+      break;
+    /* TODO(mkm): handle streaming */
+    case MG_EV_HTTP_REPLY:
+      mg_send(pd->reverse_proxy_data.linked_conn, hm->message.p,
+              hm->message.len);
+      pd->reverse_proxy_data.linked_conn->flags |= MG_F_SEND_AND_CLOSE;
+      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+      break;
+    case MG_EV_CLOSE:
+      pd->reverse_proxy_data.linked_conn->flags |= MG_F_SEND_AND_CLOSE;
+      break;
+  }
+}
+
+void mg_http_reverse_proxy(struct mg_connection *nc,
+                           const struct http_message *hm, struct mg_str mount,
+                           struct mg_str upstream) {
+  struct mg_connection *be;
+  char burl[256], *purl = burl;
+  char *addr = NULL;
+  const char *path = NULL;
+  int i;
+  const char *error;
+  struct mg_connect_opts opts;
+  memset(&opts, 0, sizeof(opts));
+  opts.error_string = &error;
+
+  mg_asprintf(&purl, sizeof(burl), "%.*s%.*s", (int) upstream.len, upstream.p,
+              (int) (hm->uri.len - mount.len), hm->uri.p + mount.len);
+
+  be = mg_connect_http_base(nc->mgr, mg_reverse_proxy_handler, opts, "http://",
+                            "https://", purl, &path, NULL /* user */,
+                            NULL /* pass */, &addr);
+  LOG(LL_DEBUG, ("Proxying %.*s to %s (rule: %.*s)", (int) hm->uri.len,
+                 hm->uri.p, purl, (int) mount.len, mount.p));
+
+  if (be == NULL) {
+    LOG(LL_ERROR, ("Error connecting to %s: %s", purl, error));
+    mg_http_send_error(nc, 502, NULL);
+    goto cleanup;
+  }
+
+  /* link connections to each other, they must live and die together */
+  mg_http_get_proto_data(be)->reverse_proxy_data.linked_conn = nc;
+  mg_http_get_proto_data(nc)->reverse_proxy_data.linked_conn = be;
+
+  /* send request upstream */
+  mg_printf(be, "%.*s %s HTTP/1.1\r\n", (int) hm->method.len, hm->method.p,
+            path);
+
+  mg_printf(be, "Host: %s\r\n", addr);
+  for (i = 0; i < MG_MAX_HTTP_HEADERS && hm->header_names[i].len > 0; i++) {
+    struct mg_str hn = hm->header_names[i];
+    struct mg_str hv = hm->header_values[i];
+
+    /* we rewrite the host header */
+    if (mg_vcasecmp(&hn, "Host") == 0) continue;
+    /*
+     * Don't pass chunked transfer encoding to the client because hm->body is
+     * already dechunked when we arrive here.
+     */
+    if (mg_vcasecmp(&hn, "Transfer-encoding") == 0 &&
+        mg_vcasecmp(&hv, "chunked") == 0) {
+      mg_printf(be, "Content-Length: %" SIZE_T_FMT "\r\n", hm->body.len);
+      continue;
+    }
+    /* We don't support proxying Expect: 100-continue. */
+    if (mg_vcasecmp(&hn, "Expect") == 0 &&
+        mg_vcasecmp(&hv, "100-continue") == 0) {
+      continue;
+    }
+
+    mg_printf(be, "%.*s: %.*s\r\n", (int) hn.len, hn.p, (int) hv.len, hv.p);
+  }
+
+  mg_send(be, "\r\n", 2);
+  mg_send(be, hm->body.p, hm->body.len);
+
+cleanup:
+  if (purl != burl) MG_FREE(purl);
+}
+
+static int mg_http_handle_forwarding(struct mg_connection *nc,
+                                     struct http_message *hm,
+                                     const struct mg_serve_http_opts *opts) {
+  const char *rewrites = opts->url_rewrites;
+  struct mg_str a, b;
+  struct mg_str p1 = MG_MK_STR("http://"), p2 = MG_MK_STR("https://");
+
+  while ((rewrites = mg_next_comma_list_entry(rewrites, &a, &b)) != NULL) {
+    if (mg_strncmp(a, hm->uri, a.len) == 0) {
+      if (mg_strncmp(b, p1, p1.len) == 0 || mg_strncmp(b, p2, p2.len) == 0) {
+        mg_http_reverse_proxy(nc, hm, a, b);
+        return 1;
+      }
+    }
+  }
+
+  return 0;
+}
+#endif
+
+MG_INTERNAL int mg_uri_to_local_path(struct http_message *hm,
+                                     const struct mg_serve_http_opts *opts,
+                                     char **local_path,
+                                     struct mg_str *remainder) {
+  int ok = 1;
+  const char *cp = hm->uri.p, *cp_end = hm->uri.p + hm->uri.len;
+  struct mg_str root = {NULL, 0};
+  const char *file_uri_start = cp;
+  *local_path = NULL;
+  remainder->p = NULL;
+  remainder->len = 0;
+
+  { /* 1. Determine which root to use. */
+
+#if MG_ENABLE_HTTP_URL_REWRITES
+    const char *rewrites = opts->url_rewrites;
+#else
+    const char *rewrites = "";
+#endif
+    struct mg_str *hh = mg_get_http_header(hm, "Host");
+    struct mg_str a, b;
+    /* Check rewrites first. */
+    while ((rewrites = mg_next_comma_list_entry(rewrites, &a, &b)) != NULL) {
+      if (a.len > 1 && a.p[0] == '@') {
+        /* Host rewrite. */
+        if (hh != NULL && hh->len == a.len - 1 &&
+            mg_ncasecmp(a.p + 1, hh->p, a.len - 1) == 0) {
+          root = b;
+          break;
+        }
+      } else {
+        /* Regular rewrite, URI=directory */
+        int match_len = mg_match_prefix_n(a, hm->uri);
+        if (match_len > 0) {
+          file_uri_start = hm->uri.p + match_len;
+          if (*file_uri_start == '/' || file_uri_start == cp_end) {
+            /* Match ended at component boundary, ok. */
+          } else if (*(file_uri_start - 1) == '/') {
+            /* Pattern ends with '/', backtrack. */
+            file_uri_start--;
+          } else {
+            /* No match: must fall on the component boundary. */
+            continue;
+          }
+          root = b;
+          break;
+        }
+      }
+    }
+    /* If no rewrite rules matched, use DAV or regular document root. */
+    if (root.p == NULL) {
+#if MG_ENABLE_HTTP_WEBDAV
+      if (opts->dav_document_root != NULL && mg_is_dav_request(&hm->method)) {
+        root.p = opts->dav_document_root;
+        root.len = strlen(opts->dav_document_root);
+      } else
+#endif
+      {
+        root.p = opts->document_root;
+        root.len = strlen(opts->document_root);
+      }
+    }
+    assert(root.p != NULL && root.len > 0);
+  }
+
+  { /* 2. Find where in the canonical URI path the local path ends. */
+    const char *u = file_uri_start + 1;
+    char *lp = (char *) MG_MALLOC(root.len + hm->uri.len + 1);
+    char *lp_end = lp + root.len + hm->uri.len + 1;
+    char *p = lp, *ps;
+    int exists = 1;
+    if (lp == NULL) {
+      ok = 0;
+      goto out;
+    }
+    memcpy(p, root.p, root.len);
+    p += root.len;
+    if (*(p - 1) == DIRSEP) p--;
+    *p = '\0';
+    ps = p;
+
+    /* Chop off URI path components one by one and build local path. */
+    while (u <= cp_end) {
+      const char *next = u;
+      struct mg_str component;
+      if (exists) {
+        cs_stat_t st;
+        exists = (mg_stat(lp, &st) == 0);
+        if (exists && S_ISREG(st.st_mode)) {
+          /* We found the terminal, the rest of the URI (if any) is path_info.
+           */
+          if (*(u - 1) == '/') u--;
+          break;
+        }
+      }
+      if (u >= cp_end) break;
+      parse_uri_component((const char **) &next, cp_end, '/', &component);
+      if (component.len > 0) {
+        int len;
+        memmove(p + 1, component.p, component.len);
+        len = mg_url_decode(p + 1, component.len, p + 1, lp_end - p - 1, 0);
+        if (len <= 0) {
+          ok = 0;
+          break;
+        }
+        component.p = p + 1;
+        component.len = len;
+        if (mg_vcmp(&component, ".") == 0) {
+          /* Yum. */
+        } else if (mg_vcmp(&component, "..") == 0) {
+          while (p > ps && *p != DIRSEP) p--;
+          *p = '\0';
+        } else {
+          size_t i;
+#ifdef _WIN32
+          /* On Windows, make sure it's valid Unicode (no funny stuff). */
+          wchar_t buf[MG_MAX_PATH * 2];
+          if (to_wchar(component.p, buf, MG_MAX_PATH) == 0) {
+            DBG(("[%.*s] smells funny", (int) component.len, component.p));
+            ok = 0;
+            break;
+          }
+#endif
+          *p++ = DIRSEP;
+          /* No NULs and DIRSEPs in the component (percent-encoded). */
+          for (i = 0; i < component.len; i++, p++) {
+            if (*p == '\0' || *p == DIRSEP
+#ifdef _WIN32
+                /* On Windows, "/" is also accepted, so check for that too. */
+                ||
+                *p == '/'
+#endif
+                ) {
+              ok = 0;
+              break;
+            }
+          }
+        }
+      }
+      u = next;
+    }
+    if (ok) {
+      *local_path = lp;
+      if (u > cp_end) u = cp_end;
+      remainder->p = u;
+      remainder->len = cp_end - u;
+    } else {
+      MG_FREE(lp);
+    }
+  }
+
+out:
+  LOG(LL_DEBUG,
+      ("'%.*s' -> '%s' + '%.*s'", (int) hm->uri.len, hm->uri.p,
+       *local_path ? *local_path : "", (int) remainder->len, remainder->p));
+  return ok;
+}
+
+static int mg_get_month_index(const char *s) {
+  static const char *month_names[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+                                      "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
+  size_t i;
+
+  for (i = 0; i < ARRAY_SIZE(month_names); i++)
+    if (!strcmp(s, month_names[i])) return (int) i;
+
+  return -1;
+}
+
+static int mg_num_leap_years(int year) {
+  return year / 4 - year / 100 + year / 400;
+}
+
+/* Parse UTC date-time string, and return the corresponding time_t value. */
+MG_INTERNAL time_t mg_parse_date_string(const char *datetime) {
+  static const unsigned short days_before_month[] = {
+      0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
+  char month_str[32];
+  int second, minute, hour, day, month, year, leap_days, days;
+  time_t result = (time_t) 0;
+
+  if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d", &day, month_str, &year, &hour,
+               &minute, &second) == 6) ||
+       (sscanf(datetime, "%d %3s %d %d:%d:%d", &day, month_str, &year, &hour,
+               &minute, &second) == 6) ||
+       (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d", &day, month_str, &year,
+               &hour, &minute, &second) == 6) ||
+       (sscanf(datetime, "%d-%3s-%d %d:%d:%d", &day, month_str, &year, &hour,
+               &minute, &second) == 6)) &&
+      year > 1970 && (month = mg_get_month_index(month_str)) != -1) {
+    leap_days = mg_num_leap_years(year) - mg_num_leap_years(1970);
+    year -= 1970;
+    days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
+    result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
+  }
+
+  return result;
+}
+
+MG_INTERNAL int mg_is_not_modified(struct http_message *hm, cs_stat_t *st) {
+  struct mg_str *hdr;
+  if ((hdr = mg_get_http_header(hm, "If-None-Match")) != NULL) {
+    char etag[64];
+    mg_http_construct_etag(etag, sizeof(etag), st);
+    return mg_vcasecmp(hdr, etag) == 0;
+  } else if ((hdr = mg_get_http_header(hm, "If-Modified-Since")) != NULL) {
+    return st->st_mtime <= mg_parse_date_string(hdr->p);
+  } else {
+    return 0;
+  }
+}
+
+static void mg_http_send_digest_auth_request(struct mg_connection *c,
+                                             const char *domain) {
+  mg_printf(c,
+            "HTTP/1.1 401 Unauthorized\r\n"
+            "WWW-Authenticate: Digest qop=\"auth\", "
+            "realm=\"%s\", nonce=\"%lu\"\r\n"
+            "Content-Length: 0\r\n\r\n",
+            domain, (unsigned long) mg_time());
+}
+
+static void mg_http_send_options(struct mg_connection *nc) {
+  mg_printf(nc, "%s",
+            "HTTP/1.1 200 OK\r\nAllow: GET, POST, HEAD, CONNECT, OPTIONS"
+#if MG_ENABLE_HTTP_WEBDAV
+            ", MKCOL, PUT, DELETE, PROPFIND, MOVE\r\nDAV: 1,2"
+#endif
+            "\r\n\r\n");
+  nc->flags |= MG_F_SEND_AND_CLOSE;
+}
+
+static int mg_is_creation_request(const struct http_message *hm) {
+  return mg_vcmp(&hm->method, "MKCOL") == 0 || mg_vcmp(&hm->method, "PUT") == 0;
+}
+
+MG_INTERNAL void mg_send_http_file(struct mg_connection *nc, char *path,
+                                   const struct mg_str *path_info,
+                                   struct http_message *hm,
+                                   struct mg_serve_http_opts *opts) {
+  int exists, is_directory, is_cgi;
+#if MG_ENABLE_HTTP_WEBDAV
+  int is_dav = mg_is_dav_request(&hm->method);
+#else
+  int is_dav = 0;
+#endif
+  char *index_file = NULL;
+  cs_stat_t st;
+
+  exists = (mg_stat(path, &st) == 0);
+  is_directory = exists && S_ISDIR(st.st_mode);
+
+  if (is_directory)
+    mg_find_index_file(path, opts->index_files, &index_file, &st);
+
+  is_cgi =
+      (mg_match_prefix(opts->cgi_file_pattern, strlen(opts->cgi_file_pattern),
+                       index_file ? index_file : path) > 0);
+
+  LOG(LL_DEBUG,
+      ("%p %.*s [%s] exists=%d is_dir=%d is_dav=%d is_cgi=%d index=%s", nc,
+       (int) hm->method.len, hm->method.p, path, exists, is_directory, is_dav,
+       is_cgi, index_file ? index_file : ""));
+
+  if (is_directory && hm->uri.p[hm->uri.len - 1] != '/' && !is_dav) {
+    mg_printf(nc,
+              "HTTP/1.1 301 Moved\r\nLocation: %.*s/\r\n"
+              "Content-Length: 0\r\n\r\n",
+              (int) hm->uri.len, hm->uri.p);
+    MG_FREE(index_file);
+    return;
+  }
+
+  /* If we have path_info, the only way to handle it is CGI. */
+  if (path_info->len > 0 && !is_cgi) {
+    mg_http_send_error(nc, 501, NULL);
+    MG_FREE(index_file);
+    return;
+  }
+
+  if (is_dav && opts->dav_document_root == NULL) {
+    mg_http_send_error(nc, 501, NULL);
+  } else if (!mg_is_authorized(hm, path, is_directory, opts->auth_domain,
+                               opts->global_auth_file, 1) ||
+             !mg_is_authorized(hm, path, is_directory, opts->auth_domain,
+                               opts->per_directory_auth_file, 0)) {
+    mg_http_send_digest_auth_request(nc, opts->auth_domain);
+  } else if (is_cgi) {
+#if MG_ENABLE_HTTP_CGI
+    mg_handle_cgi(nc, index_file ? index_file : path, path_info, hm, opts);
+#else
+    mg_http_send_error(nc, 501, NULL);
+#endif /* MG_ENABLE_HTTP_CGI */
+  } else if ((!exists ||
+              mg_is_file_hidden(path, opts, 0 /* specials are ok */)) &&
+             !mg_is_creation_request(hm)) {
+    mg_http_send_error(nc, 404, NULL);
+#if MG_ENABLE_HTTP_WEBDAV
+  } else if (!mg_vcmp(&hm->method, "PROPFIND")) {
+    mg_handle_propfind(nc, path, &st, hm, opts);
+#if !MG_DISABLE_DAV_AUTH
+  } else if (is_dav &&
+             (opts->dav_auth_file == NULL ||
+              (strcmp(opts->dav_auth_file, "-") != 0 &&
+               !mg_is_authorized(hm, path, is_directory, opts->auth_domain,
+                                 opts->dav_auth_file, 1)))) {
+    mg_http_send_digest_auth_request(nc, opts->auth_domain);
+#endif
+  } else if (!mg_vcmp(&hm->method, "MKCOL")) {
+    mg_handle_mkcol(nc, path, hm);
+  } else if (!mg_vcmp(&hm->method, "DELETE")) {
+    mg_handle_delete(nc, opts, path);
+  } else if (!mg_vcmp(&hm->method, "PUT")) {
+    mg_handle_put(nc, path, hm);
+  } else if (!mg_vcmp(&hm->method, "MOVE")) {
+    mg_handle_move(nc, opts, path, hm);
+#if MG_ENABLE_FAKE_DAVLOCK
+  } else if (!mg_vcmp(&hm->method, "LOCK")) {
+    mg_handle_lock(nc, path);
+#endif
+#endif /* MG_ENABLE_HTTP_WEBDAV */
+  } else if (!mg_vcmp(&hm->method, "OPTIONS")) {
+    mg_http_send_options(nc);
+  } else if (is_directory && index_file == NULL) {
+#if MG_ENABLE_DIRECTORY_LISTING
+    if (strcmp(opts->enable_directory_listing, "yes") == 0) {
+      mg_send_directory_listing(nc, path, hm, opts);
+    } else {
+      mg_http_send_error(nc, 403, NULL);
+    }
+#else
+    mg_http_send_error(nc, 501, NULL);
+#endif
+  } else if (mg_is_not_modified(hm, &st)) {
+    mg_http_send_error(nc, 304, "Not Modified");
+  } else {
+    mg_http_serve_file2(nc, index_file ? index_file : path, hm, opts);
+  }
+  MG_FREE(index_file);
+}
+
+void mg_serve_http(struct mg_connection *nc, struct http_message *hm,
+                   struct mg_serve_http_opts opts) {
+  char *path = NULL;
+  struct mg_str *hdr, path_info;
+  uint32_t remote_ip = ntohl(*(uint32_t *) &nc->sa.sin.sin_addr);
+
+  if (mg_check_ip_acl(opts.ip_acl, remote_ip) != 1) {
+    /* Not allowed to connect */
+    mg_http_send_error(nc, 403, NULL);
+    nc->flags |= MG_F_SEND_AND_CLOSE;
+    return;
+  }
+
+#if MG_ENABLE_HTTP_URL_REWRITES
+  if (mg_http_handle_forwarding(nc, hm, &opts)) {
+    return;
+  }
+
+  if (mg_http_send_port_based_redirect(nc, hm, &opts)) {
+    return;
+  }
+#endif
+
+  if (opts.document_root == NULL) {
+    opts.document_root = ".";
+  }
+  if (opts.per_directory_auth_file == NULL) {
+    opts.per_directory_auth_file = ".htpasswd";
+  }
+  if (opts.enable_directory_listing == NULL) {
+    opts.enable_directory_listing = "yes";
+  }
+  if (opts.cgi_file_pattern == NULL) {
+    opts.cgi_file_pattern = "**.cgi$|**.php$";
+  }
+  if (opts.ssi_pattern == NULL) {
+    opts.ssi_pattern = "**.shtml$|**.shtm$";
+  }
+  if (opts.index_files == NULL) {
+    opts.index_files = "index.html,index.htm,index.shtml,index.cgi,index.php";
+  }
+  /* Normalize path - resolve "." and ".." (in-place). */
+  if (!mg_normalize_uri_path(&hm->uri, &hm->uri)) {
+    mg_http_send_error(nc, 400, NULL);
+    return;
+  }
+  if (mg_uri_to_local_path(hm, &opts, &path, &path_info) == 0) {
+    mg_http_send_error(nc, 404, NULL);
+    return;
+  }
+  mg_send_http_file(nc, path, &path_info, hm, &opts);
+
+  MG_FREE(path);
+  path = NULL;
+
+  /* Close connection for non-keep-alive requests */
+  if (mg_vcmp(&hm->proto, "HTTP/1.1") != 0 ||
+      ((hdr = mg_get_http_header(hm, "Connection")) != NULL &&
+       mg_vcmp(hdr, "keep-alive") != 0)) {
+#if 0
+    nc->flags |= MG_F_SEND_AND_CLOSE;
+#endif
+  }
+}
+
+#if MG_ENABLE_HTTP_STREAMING_MULTIPART
+void mg_file_upload_handler(struct mg_connection *nc, int ev, void *ev_data,
+                            mg_fu_fname_fn local_name_fn) {
+  switch (ev) {
+    case MG_EV_HTTP_PART_BEGIN: {
+      struct mg_http_multipart_part *mp =
+          (struct mg_http_multipart_part *) ev_data;
+      struct file_upload_state *fus =
+          (struct file_upload_state *) MG_CALLOC(1, sizeof(*fus));
+      struct mg_str lfn = local_name_fn(nc, mg_mk_str(mp->file_name));
+      mp->user_data = NULL;
+      if (lfn.p == NULL || lfn.len == 0) {
+        LOG(LL_ERROR, ("%p Not allowed to upload %s", nc, mp->file_name));
+        mg_printf(nc,
+                  "HTTP/1.1 403 Not Allowed\r\n"
+                  "Content-Type: text/plain\r\n"
+                  "Connection: close\r\n\r\n"
+                  "Not allowed to upload %s\r\n",
+                  mp->file_name);
+        nc->flags |= MG_F_SEND_AND_CLOSE;
+        return;
+      }
+      fus->lfn = (char *) MG_MALLOC(lfn.len + 1);
+      memcpy(fus->lfn, lfn.p, lfn.len);
+      fus->lfn[lfn.len] = '\0';
+      if (lfn.p != mp->file_name) MG_FREE((char *) lfn.p);
+      LOG(LL_DEBUG,
+          ("%p Receiving file %s -> %s", nc, mp->file_name, fus->lfn));
+      fus->fp = mg_fopen(fus->lfn, "w");
+      if (fus->fp == NULL) {
+        mg_printf(nc,
+                  "HTTP/1.1 500 Internal Server Error\r\n"
+                  "Content-Type: text/plain\r\n"
+                  "Connection: close\r\n\r\n");
+        LOG(LL_ERROR, ("Failed to open %s: %d\n", fus->lfn, mg_get_errno()));
+        mg_printf(nc, "Failed to open %s: %d\n", fus->lfn, mg_get_errno());
+        /* Do not close the connection just yet, discard remainder of the data.
+         * This is because at the time of writing some browsers (Chrome) fail to
+         * render response before all the data is sent. */
+      }
+      mp->user_data = (void *) fus;
+      break;
+    }
+    case MG_EV_HTTP_PART_DATA: {
+      struct mg_http_multipart_part *mp =
+          (struct mg_http_multipart_part *) ev_data;
+      struct file_upload_state *fus =
+          (struct file_upload_state *) mp->user_data;
+      if (fus == NULL || fus->fp == NULL) break;
+      if (fwrite(mp->data.p, 1, mp->data.len, fus->fp) != mp->data.len) {
+        LOG(LL_ERROR, ("Failed to write to %s: %d, wrote %d", fus->lfn,
+                       mg_get_errno(), (int) fus->num_recd));
+        if (mg_get_errno() == ENOSPC
+#ifdef SPIFFS_ERR_FULL
+            || mg_get_errno() == SPIFFS_ERR_FULL
+#endif
+            ) {
+          mg_printf(nc,
+                    "HTTP/1.1 413 Payload Too Large\r\n"
+                    "Content-Type: text/plain\r\n"
+                    "Connection: close\r\n\r\n");
+          mg_printf(nc, "Failed to write to %s: no space left; wrote %d\r\n",
+                    fus->lfn, (int) fus->num_recd);
+        } else {
+          mg_printf(nc,
+                    "HTTP/1.1 500 Internal Server Error\r\n"
+                    "Content-Type: text/plain\r\n"
+                    "Connection: close\r\n\r\n");
+          mg_printf(nc, "Failed to write to %s: %d, wrote %d", mp->file_name,
+                    mg_get_errno(), (int) fus->num_recd);
+        }
+        fclose(fus->fp);
+        remove(fus->lfn);
+        fus->fp = NULL;
+        /* Do not close the connection just yet, discard remainder of the data.
+         * This is because at the time of writing some browsers (Chrome) fail to
+         * render response before all the data is sent. */
+        return;
+      }
+      fus->num_recd += mp->data.len;
+      LOG(LL_DEBUG, ("%p rec'd %d bytes, %d total", nc, (int) mp->data.len,
+                     (int) fus->num_recd));
+      break;
+    }
+    case MG_EV_HTTP_PART_END: {
+      struct mg_http_multipart_part *mp =
+          (struct mg_http_multipart_part *) ev_data;
+      struct file_upload_state *fus =
+          (struct file_upload_state *) mp->user_data;
+      if (fus == NULL) break;
+      if (mp->status >= 0 && fus->fp != NULL) {
+        LOG(LL_DEBUG, ("%p Uploaded %s (%s), %d bytes", nc, mp->file_name,
+                       fus->lfn, (int) fus->num_recd));
+//        mg_printf(nc,
+//                  "HTTP/1.1 200 OK\r\n"
+//                  "Content-Type: text/plain\r\n"
+//                  "Connection: close\r\n\r\n"
+//                  "Ok, %s - %d bytes.\r\n",
+//                  mp->file_name, (int) fus->num_recd);
+      } else {
+        LOG(LL_ERROR, ("Failed to store %s (%s)", mp->file_name, fus->lfn));
+        /*
+         * mp->status < 0 means connection was terminated, so no reason to send
+         * HTTP reply
+         */
+      }
+      if (fus->fp != NULL) fclose(fus->fp);
+      MG_FREE(fus->lfn);
+      MG_FREE(fus);
+      mp->user_data = NULL;
+      nc->flags |= MG_F_SEND_AND_CLOSE;
+      break;
+    }
+  }
+}
+
+#endif /* MG_ENABLE_HTTP_STREAMING_MULTIPART */
+#endif /* MG_ENABLE_FILESYSTEM */
+
+/* returns 0 on success, -1 on error */
+MG_INTERNAL int mg_http_common_url_parse(const char *url, const char *schema,
+                                         const char *schema_tls, int *use_ssl,
+                                         char **user, char **pass, char **addr,
+                                         int *port_i, const char **path) {
+  int addr_len = 0;
+  int auth_sep_pos = -1;
+  int user_sep_pos = -1;
+  int port_pos = -1;
+  (void) user;
+  (void) pass;
+
+  if (strncmp(url, schema, strlen(schema)) == 0) {
+    url += strlen(schema);
+  } else if (strncmp(url, schema_tls, strlen(schema_tls)) == 0) {
+    url += strlen(schema_tls);
+    *use_ssl = 1;
+#if !MG_ENABLE_SSL
+    return -1; /* SSL is not enabled, cannot do HTTPS URLs */
+#endif
+  }
+
+  while (*url != '\0') {
+    *addr = (char *) MG_REALLOC(*addr, addr_len + 6 /* space for port too. */);
+    if (*addr == NULL) {
+      DBG(("OOM"));
+      return -1;
+    }
+    if (*url == '/') {
+      break;
+    }
+    if (*url == '@') {
+      auth_sep_pos = addr_len;
+      user_sep_pos = port_pos;
+      port_pos = -1;
+    }
+    if (*url == ':') port_pos = addr_len;
+    (*addr)[addr_len++] = *url;
+    (*addr)[addr_len] = '\0';
+    url++;
+  }
+
+  if (addr_len == 0) goto cleanup;
+  if (port_pos < 0) {
+    *port_i = addr_len;
+    addr_len += sprintf(*addr + addr_len, ":%d", *use_ssl ? 443 : 80);
+  } else {
+    *port_i = -1;
+  }
+
+  if (*path == NULL) *path = url;
+
+  if (**path == '\0') *path = "/";
+
+  if (user != NULL && pass != NULL) {
+    if (auth_sep_pos == -1) {
+      *user = NULL;
+      *pass = NULL;
+    } else {
+      /* user is from 0 to user_sep_pos */
+      *user = (char *) MG_MALLOC(user_sep_pos + 1);
+      memcpy(*user, *addr, user_sep_pos);
+      (*user)[user_sep_pos] = '\0';
+      /* pass is from user_sep_pos + 1 to auth_sep_pos */
+      *pass = (char *) MG_MALLOC(auth_sep_pos - user_sep_pos - 1 + 1);
+      memcpy(*pass, *addr + user_sep_pos + 1, auth_sep_pos - user_sep_pos - 1);
+      (*pass)[auth_sep_pos - user_sep_pos - 1] = '\0';
+
+      /* move address proper to the front */
+      memmove(*addr, *addr + auth_sep_pos + 1, addr_len - auth_sep_pos);
+    }
+  }
+
+  DBG(("%s %s", *addr, *path));
+
+  return 0;
+
+cleanup:
+  MG_FREE(*addr);
+  return -1;
+}
+
+struct mg_connection *mg_connect_http_base(
+    struct mg_mgr *mgr, mg_event_handler_t ev_handler,
+    struct mg_connect_opts opts, const char *schema, const char *schema_ssl,
+    const char *url, const char **path, char **user, char **pass, char **addr) {
+  struct mg_connection *nc = NULL;
+  int port_i = -1;
+  int use_ssl = 0;
+
+  if (mg_http_common_url_parse(url, schema, schema_ssl, &use_ssl, user, pass,
+                               addr, &port_i, path) < 0) {
+    MG_SET_PTRPTR(opts.error_string, "cannot parse url");
+    return NULL;
+  }
+
+  LOG(LL_DEBUG, ("%s use_ssl? %d", url, use_ssl));
+  if (use_ssl) {
+#if MG_ENABLE_SSL
+    /*
+     * Schema requires SSL, but no SSL parameters were provided in opts.
+     * In order to maintain backward compatibility, use a faux-SSL with no
+     * verification.
+     */
+    if (opts.ssl_ca_cert == NULL) {
+      opts.ssl_ca_cert = "*";
+    }
+#else
+    MG_SET_PTRPTR(opts.error_string, "ssl is disabled");
+    if (user != NULL) MG_FREE(*user);
+    if (pass != NULL) MG_FREE(*pass);
+    MG_FREE(*addr);
+    return NULL;
+#endif
+  }
+
+  if ((nc = mg_connect_opt(mgr, *addr, ev_handler, opts)) != NULL) {
+    mg_set_protocol_http_websocket(nc);
+    /* If the port was addred by us, restore the original host. */
+    if (port_i >= 0) (*addr)[port_i] = '\0';
+  }
+
+  return nc;
+}
+
+struct mg_connection *mg_connect_http_opt(struct mg_mgr *mgr,
+                                          mg_event_handler_t ev_handler,
+                                          struct mg_connect_opts opts,
+                                          const char *url,
+                                          const char *extra_headers,
+                                          const char *post_data) {
+  char *user = NULL, *pass = NULL, *addr = NULL;
+  const char *path = NULL;
+  struct mbuf auth;
+  struct mg_connection *nc =
+      mg_connect_http_base(mgr, ev_handler, opts, "http://", "https://", url,
+                           &path, &user, &pass, &addr);
+
+  if (nc == NULL) {
+    return NULL;
+  }
+
+  mbuf_init(&auth, 0);
+  if (user != NULL) {
+    mg_basic_auth_header(user, pass, &auth);
+  }
+
+  mg_printf(nc, "%s %s HTTP/1.1\r\nHost: %s\r\nContent-Length: %" SIZE_T_FMT
+                "\r\n%.*s%s\r\n%s",
+            post_data == NULL ? "GET" : "POST", path, addr,
+            post_data == NULL ? 0 : strlen(post_data), (int) auth.len,
+            (auth.buf == NULL ? "" : auth.buf),
+            extra_headers == NULL ? "" : extra_headers,
+            post_data == NULL ? "" : post_data);
+
+  mbuf_free(&auth);
+  MG_FREE(user);
+  MG_FREE(pass);
+  MG_FREE(addr);
+  return nc;
+}
+
+struct mg_connection *mg_connect_http(struct mg_mgr *mgr,
+                                      mg_event_handler_t ev_handler,
+                                      const char *url,
+                                      const char *extra_headers,
+                                      const char *post_data) {
+  struct mg_connect_opts opts;
+  memset(&opts, 0, sizeof(opts));
+  return mg_connect_http_opt(mgr, ev_handler, opts, url, extra_headers,
+                             post_data);
+}
+
+size_t mg_parse_multipart(const char *buf, size_t buf_len, char *var_name,
+                          size_t var_name_len, char *file_name,
+                          size_t file_name_len, const char **data,
+                          size_t *data_len) {
+  static const char cd[] = "Content-Disposition: ";
+  size_t hl, bl, n, ll, pos, cdl = sizeof(cd) - 1;
+
+  if (buf == NULL || buf_len <= 0) return 0;
+  if ((hl = mg_http_get_request_len(buf, buf_len)) <= 0) return 0;
+  if (buf[0] != '-' || buf[1] != '-' || buf[2] == '\n') return 0;
+
+  /* Get boundary length */
+  bl = mg_get_line_len(buf, buf_len);
+
+  /* Loop through headers, fetch variable name and file name */
+  var_name[0] = file_name[0] = '\0';
+  for (n = bl; (ll = mg_get_line_len(buf + n, hl - n)) > 0; n += ll) {
+    if (mg_ncasecmp(cd, buf + n, cdl) == 0) {
+      struct mg_str header;
+      header.p = buf + n + cdl;
+      header.len = ll - (cdl + 2);
+      mg_http_parse_header(&header, "name", var_name, var_name_len);
+      mg_http_parse_header(&header, "filename", file_name, file_name_len);
+    }
+  }
+
+  /* Scan through the body, search for terminating boundary */
+  for (pos = hl; pos + (bl - 2) < buf_len; pos++) {
+    if (buf[pos] == '-' && !strncmp(buf, &buf[pos], bl - 2)) {
+      if (data_len != NULL) *data_len = (pos - 2) - hl;
+      if (data != NULL) *data = buf + hl;
+      return pos;
+    }
+  }
+
+  return 0;
+}
+
+void mg_register_http_endpoint(struct mg_connection *nc, const char *uri_path,
+                               mg_event_handler_t handler) {
+  struct mg_http_proto_data *pd = NULL;
+  struct mg_http_endpoint *new_ep = NULL;
+
+  if (nc == NULL) return;
+  new_ep = (struct mg_http_endpoint *) MG_CALLOC(1, sizeof(*new_ep));
+  if (new_ep == NULL) return;
+
+  pd = mg_http_get_proto_data(nc);
+  new_ep->name = MG_STRDUP(uri_path);
+  new_ep->name_len = strlen(new_ep->name);
+  new_ep->handler = handler;
+  new_ep->next = pd->endpoints;
+  pd->endpoints = new_ep;
+}
+
+#endif /* MG_ENABLE_HTTP */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/http_cgi.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_HTTP && MG_ENABLE_HTTP_CGI
+
+#ifndef MG_MAX_CGI_ENVIR_VARS
+#define MG_MAX_CGI_ENVIR_VARS 64
+#endif
+
+#ifndef MG_ENV_EXPORT_TO_CGI
+#define MG_ENV_EXPORT_TO_CGI "MONGOOSE_CGI"
+#endif
+
+/*
+ * This structure helps to create an environment for the spawned CGI program.
+ * Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
+ * last element must be NULL.
+ * However, on Windows there is a requirement that all these VARIABLE=VALUE\0
+ * strings must reside in a contiguous buffer. The end of the buffer is
+ * marked by two '\0' characters.
+ * We satisfy both worlds: we create an envp array (which is vars), all
+ * entries are actually pointers inside buf.
+ */
+struct mg_cgi_env_block {
+  struct mg_connection *nc;
+  char buf[MG_CGI_ENVIRONMENT_SIZE];       /* Environment buffer */
+  const char *vars[MG_MAX_CGI_ENVIR_VARS]; /* char *envp[] */
+  int len;                                 /* Space taken */
+  int nvars;                               /* Number of variables in envp[] */
+};
+
+#ifdef _WIN32
+struct mg_threadparam {
+  sock_t s;
+  HANDLE hPipe;
+};
+
+static int mg_wait_until_ready(sock_t sock, int for_read) {
+  fd_set set;
+  FD_ZERO(&set);
+  FD_SET(sock, &set);
+  return select(sock + 1, for_read ? &set : 0, for_read ? 0 : &set, 0, 0) == 1;
+}
+
+static void *mg_push_to_stdin(void *arg) {
+  struct mg_threadparam *tp = (struct mg_threadparam *) arg;
+  int n, sent, stop = 0;
+  DWORD k;
+  char buf[BUFSIZ];
+
+  while (!stop && mg_wait_until_ready(tp->s, 1) &&
+         (n = recv(tp->s, buf, sizeof(buf), 0)) > 0) {
+    if (n == -1 && GetLastError() == WSAEWOULDBLOCK) continue;
+    for (sent = 0; !stop && sent < n; sent += k) {
+      if (!WriteFile(tp->hPipe, buf + sent, n - sent, &k, 0)) stop = 1;
+    }
+  }
+  DBG(("%s", "FORWARED EVERYTHING TO CGI"));
+  CloseHandle(tp->hPipe);
+  MG_FREE(tp);
+  return NULL;
+}
+
+static void *mg_pull_from_stdout(void *arg) {
+  struct mg_threadparam *tp = (struct mg_threadparam *) arg;
+  int k = 0, stop = 0;
+  DWORD n, sent;
+  char buf[BUFSIZ];
+
+  while (!stop && ReadFile(tp->hPipe, buf, sizeof(buf), &n, NULL)) {
+    for (sent = 0; !stop && sent < n; sent += k) {
+      if (mg_wait_until_ready(tp->s, 0) &&
+          (k = send(tp->s, buf + sent, n - sent, 0)) <= 0)
+        stop = 1;
+    }
+  }
+  DBG(("%s", "EOF FROM CGI"));
+  CloseHandle(tp->hPipe);
+  shutdown(tp->s, 2);  // Without this, IO thread may get truncated data
+  closesocket(tp->s);
+  MG_FREE(tp);
+  return NULL;
+}
+
+static void mg_spawn_stdio_thread(sock_t sock, HANDLE hPipe,
+                                  void *(*func)(void *)) {
+  struct mg_threadparam *tp = (struct mg_threadparam *) MG_MALLOC(sizeof(*tp));
+  if (tp != NULL) {
+    tp->s = sock;
+    tp->hPipe = hPipe;
+    mg_start_thread(func, tp);
+  }
+}
+
+static void mg_abs_path(const char *utf8_path, char *abs_path, size_t len) {
+  wchar_t buf[MAX_PATH_SIZE], buf2[MAX_PATH_SIZE];
+  to_wchar(utf8_path, buf, ARRAY_SIZE(buf));
+  GetFullPathNameW(buf, ARRAY_SIZE(buf2), buf2, NULL);
+  WideCharToMultiByte(CP_UTF8, 0, buf2, wcslen(buf2) + 1, abs_path, len, 0, 0);
+}
+
+static int mg_start_process(const char *interp, const char *cmd,
+                            const char *env, const char *envp[],
+                            const char *dir, sock_t sock) {
+  STARTUPINFOW si;
+  PROCESS_INFORMATION pi;
+  HANDLE a[2], b[2], me = GetCurrentProcess();
+  wchar_t wcmd[MAX_PATH_SIZE], full_dir[MAX_PATH_SIZE];
+  char buf[MAX_PATH_SIZE], buf2[MAX_PATH_SIZE], buf5[MAX_PATH_SIZE],
+      buf4[MAX_PATH_SIZE], cmdline[MAX_PATH_SIZE];
+  DWORD flags = DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS;
+  FILE *fp;
+
+  memset(&si, 0, sizeof(si));
+  memset(&pi, 0, sizeof(pi));
+
+  si.cb = sizeof(si);
+  si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
+  si.wShowWindow = SW_HIDE;
+  si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
+
+  CreatePipe(&a[0], &a[1], NULL, 0);
+  CreatePipe(&b[0], &b[1], NULL, 0);
+  DuplicateHandle(me, a[0], me, &si.hStdInput, 0, TRUE, flags);
+  DuplicateHandle(me, b[1], me, &si.hStdOutput, 0, TRUE, flags);
+
+  if (interp == NULL && (fp = mg_fopen(cmd, "r")) != NULL) {
+    buf[0] = buf[1] = '\0';
+    fgets(buf, sizeof(buf), fp);
+    buf[sizeof(buf) - 1] = '\0';
+    if (buf[0] == '#' && buf[1] == '!') {
+      interp = buf + 2;
+      /* Trim leading spaces: https://github.com/cesanta/mongoose/issues/489 */
+      while (*interp != '\0' && isspace(*(unsigned char *) interp)) {
+        interp++;
+      }
+    }
+    fclose(fp);
+  }
+
+  snprintf(buf, sizeof(buf), "%s/%s", dir, cmd);
+  mg_abs_path(buf, buf2, ARRAY_SIZE(buf2));
+
+  mg_abs_path(dir, buf5, ARRAY_SIZE(buf5));
+  to_wchar(dir, full_dir, ARRAY_SIZE(full_dir));
+
+  if (interp != NULL) {
+    mg_abs_path(interp, buf4, ARRAY_SIZE(buf4));
+    snprintf(cmdline, sizeof(cmdline), "%s \"%s\"", buf4, buf2);
+  } else {
+    snprintf(cmdline, sizeof(cmdline), "\"%s\"", buf2);
+  }
+  to_wchar(cmdline, wcmd, ARRAY_SIZE(wcmd));
+
+  if (CreateProcessW(NULL, wcmd, NULL, NULL, TRUE, CREATE_NEW_PROCESS_GROUP,
+                     (void *) env, full_dir, &si, &pi) != 0) {
+    mg_spawn_stdio_thread(sock, a[1], mg_push_to_stdin);
+    mg_spawn_stdio_thread(sock, b[0], mg_pull_from_stdout);
+
+    CloseHandle(si.hStdOutput);
+    CloseHandle(si.hStdInput);
+
+    CloseHandle(pi.hThread);
+    CloseHandle(pi.hProcess);
+  } else {
+    CloseHandle(a[1]);
+    CloseHandle(b[0]);
+    closesocket(sock);
+  }
+  DBG(("CGI command: [%ls] -> %p", wcmd, pi.hProcess));
+
+  /* Not closing a[0] and b[1] because we've used DUPLICATE_CLOSE_SOURCE */
+  (void) envp;
+  return (pi.hProcess != NULL);
+}
+#else
+static int mg_start_process(const char *interp, const char *cmd,
+                            const char *env, const char *envp[],
+                            const char *dir, sock_t sock) {
+  char buf[500];
+  pid_t pid = fork();
+  (void) env;
+
+  if (pid == 0) {
+    /*
+     * In Linux `chdir` declared with `warn_unused_result` attribute
+     * To shutup compiler we have yo use result in some way
+     */
+    int tmp = chdir(dir);
+    (void) tmp;
+    (void) dup2(sock, 0);
+    (void) dup2(sock, 1);
+    closesocket(sock);
+
+    /*
+     * After exec, all signal handlers are restored to their default values,
+     * with one exception of SIGCHLD. According to POSIX.1-2001 and Linux's
+     * implementation, SIGCHLD's handler will leave unchanged after exec
+     * if it was set to be ignored. Restore it to default action.
+     */
+    signal(SIGCHLD, SIG_DFL);
+
+    if (interp == NULL) {
+      execle(cmd, cmd, (char *) 0, envp); /* (char *) 0 to squash warning */
+    } else {
+      execle(interp, interp, cmd, (char *) 0, envp);
+    }
+    snprintf(buf, sizeof(buf),
+             "Status: 500\r\n\r\n"
+             "500 Server Error: %s%s%s: %s",
+             interp == NULL ? "" : interp, interp == NULL ? "" : " ", cmd,
+             strerror(errno));
+    send(1, buf, strlen(buf), 0);
+    _exit(EXIT_FAILURE); /* exec call failed */
+  }
+
+  return (pid != 0);
+}
+#endif /* _WIN32 */
+
+/*
+ * Append VARIABLE=VALUE\0 string to the buffer, and add a respective
+ * pointer into the vars array.
+ */
+static char *mg_addenv(struct mg_cgi_env_block *block, const char *fmt, ...) {
+  int n, space;
+  char *added = block->buf + block->len;
+  va_list ap;
+
+  /* Calculate how much space is left in the buffer */
+  space = sizeof(block->buf) - (block->len + 2);
+  if (space > 0) {
+    /* Copy VARIABLE=VALUE\0 string into the free space */
+    va_start(ap, fmt);
+    n = vsnprintf(added, (size_t) space, fmt, ap);
+    va_end(ap);
+
+    /* Make sure we do not overflow buffer and the envp array */
+    if (n > 0 && n + 1 < space &&
+        block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
+      /* Append a pointer to the added string into the envp array */
+      block->vars[block->nvars++] = added;
+      /* Bump up used length counter. Include \0 terminator */
+      block->len += n + 1;
+    }
+  }
+
+  return added;
+}
+
+static void mg_addenv2(struct mg_cgi_env_block *blk, const char *name) {
+  const char *s;
+  if ((s = getenv(name)) != NULL) mg_addenv(blk, "%s=%s", name, s);
+}
+
+static void mg_prepare_cgi_environment(struct mg_connection *nc,
+                                       const char *prog,
+                                       const struct mg_str *path_info,
+                                       const struct http_message *hm,
+                                       const struct mg_serve_http_opts *opts,
+                                       struct mg_cgi_env_block *blk) {
+  const char *s;
+  struct mg_str *h;
+  char *p;
+  size_t i;
+  char buf[100];
+
+  blk->len = blk->nvars = 0;
+  blk->nc = nc;
+
+  if ((s = getenv("SERVER_NAME")) != NULL) {
+    mg_addenv(blk, "SERVER_NAME=%s", s);
+  } else {
+    mg_sock_to_str(nc->sock, buf, sizeof(buf), 3);
+    mg_addenv(blk, "SERVER_NAME=%s", buf);
+  }
+  mg_addenv(blk, "SERVER_ROOT=%s", opts->document_root);
+  mg_addenv(blk, "DOCUMENT_ROOT=%s", opts->document_root);
+  mg_addenv(blk, "SERVER_SOFTWARE=%s/%s", "Mongoose", MG_VERSION);
+
+  /* Prepare the environment block */
+  mg_addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
+  mg_addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
+  mg_addenv(blk, "%s", "REDIRECT_STATUS=200"); /* For PHP */
+
+  mg_addenv(blk, "REQUEST_METHOD=%.*s", (int) hm->method.len, hm->method.p);
+
+  mg_addenv(blk, "REQUEST_URI=%.*s%s%.*s", (int) hm->uri.len, hm->uri.p,
+            hm->query_string.len == 0 ? "" : "?", (int) hm->query_string.len,
+            hm->query_string.p);
+
+  mg_conn_addr_to_str(nc, buf, sizeof(buf),
+                      MG_SOCK_STRINGIFY_REMOTE | MG_SOCK_STRINGIFY_IP);
+  mg_addenv(blk, "REMOTE_ADDR=%s", buf);
+  mg_conn_addr_to_str(nc, buf, sizeof(buf), MG_SOCK_STRINGIFY_PORT);
+  mg_addenv(blk, "SERVER_PORT=%s", buf);
+
+  s = hm->uri.p + hm->uri.len - path_info->len - 1;
+  if (*s == '/') {
+    const char *base_name = strrchr(prog, DIRSEP);
+    mg_addenv(blk, "SCRIPT_NAME=%.*s/%s", (int) (s - hm->uri.p), hm->uri.p,
+              (base_name != NULL ? base_name + 1 : prog));
+  } else {
+    mg_addenv(blk, "SCRIPT_NAME=%.*s", (int) (s - hm->uri.p + 1), hm->uri.p);
+  }
+  mg_addenv(blk, "SCRIPT_FILENAME=%s", prog);
+
+  if (path_info != NULL && path_info->len > 0) {
+    mg_addenv(blk, "PATH_INFO=%.*s", (int) path_info->len, path_info->p);
+    /* Not really translated... */
+    mg_addenv(blk, "PATH_TRANSLATED=%.*s", (int) path_info->len, path_info->p);
+  }
+
+#if MG_ENABLE_SSL
+  mg_addenv(blk, "HTTPS=%s", (nc->flags & MG_F_SSL ? "on" : "off"));
+#else
+  mg_addenv(blk, "HTTPS=off");
+#endif
+
+  if ((h = mg_get_http_header((struct http_message *) hm, "Content-Type")) !=
+      NULL) {
+    mg_addenv(blk, "CONTENT_TYPE=%.*s", (int) h->len, h->p);
+  }
+
+  if (hm->query_string.len > 0) {
+    mg_addenv(blk, "QUERY_STRING=%.*s", (int) hm->query_string.len,
+              hm->query_string.p);
+  }
+
+  if ((h = mg_get_http_header((struct http_message *) hm, "Content-Length")) !=
+      NULL) {
+    mg_addenv(blk, "CONTENT_LENGTH=%.*s", (int) h->len, h->p);
+  }
+
+  mg_addenv2(blk, "PATH");
+  mg_addenv2(blk, "TMP");
+  mg_addenv2(blk, "TEMP");
+  mg_addenv2(blk, "TMPDIR");
+  mg_addenv2(blk, "PERLLIB");
+  mg_addenv2(blk, MG_ENV_EXPORT_TO_CGI);
+
+#ifdef _WIN32
+  mg_addenv2(blk, "COMSPEC");
+  mg_addenv2(blk, "SYSTEMROOT");
+  mg_addenv2(blk, "SystemDrive");
+  mg_addenv2(blk, "ProgramFiles");
+  mg_addenv2(blk, "ProgramFiles(x86)");
+  mg_addenv2(blk, "CommonProgramFiles(x86)");
+#else
+  mg_addenv2(blk, "LD_LIBRARY_PATH");
+#endif /* _WIN32 */
+
+  /* Add all headers as HTTP_* variables */
+  for (i = 0; hm->header_names[i].len > 0; i++) {
+    p = mg_addenv(blk, "HTTP_%.*s=%.*s", (int) hm->header_names[i].len,
+                  hm->header_names[i].p, (int) hm->header_values[i].len,
+                  hm->header_values[i].p);
+
+    /* Convert variable name into uppercase, and change - to _ */
+    for (; *p != '=' && *p != '\0'; p++) {
+      if (*p == '-') *p = '_';
+      *p = (char) toupper(*(unsigned char *) p);
+    }
+  }
+
+  blk->vars[blk->nvars++] = NULL;
+  blk->buf[blk->len++] = '\0';
+}
+
+static void mg_cgi_ev_handler(struct mg_connection *cgi_nc, int ev,
+                              void *ev_data) {
+  struct mg_connection *nc = (struct mg_connection *) cgi_nc->user_data;
+  (void) ev_data;
+
+  if (nc == NULL) {
+    cgi_nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+    return;
+  }
+
+  switch (ev) {
+    case MG_EV_RECV:
+      /*
+       * CGI script does not output reply line, like "HTTP/1.1 CODE XXXXX\n"
+       * It outputs headers, then body. Headers might include "Status"
+       * header, which changes CODE, and it might include "Location" header
+       * which changes CODE to 302.
+       *
+       * Therefore we do not send the output from the CGI script to the user
+       * until all CGI headers are received.
+       *
+       * Here we parse the output from the CGI script, and if all headers has
+       * been received, send appropriate reply line, and forward all
+       * received headers to the client.
+       */
+      if (nc->flags & MG_F_USER_1) {
+        struct mbuf *io = &cgi_nc->recv_mbuf;
+        int len = mg_http_get_request_len(io->buf, io->len);
+
+        if (len == 0) break;
+        if (len < 0 || io->len > MG_MAX_HTTP_REQUEST_SIZE) {
+          cgi_nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+          mg_http_send_error(nc, 500, "Bad headers");
+        } else {
+          struct http_message hm;
+          struct mg_str *h;
+          mg_http_parse_headers(io->buf, io->buf + io->len, io->len, &hm);
+          if (mg_get_http_header(&hm, "Location") != NULL) {
+            mg_printf(nc, "%s", "HTTP/1.1 302 Moved\r\n");
+          } else if ((h = mg_get_http_header(&hm, "Status")) != NULL) {
+            mg_printf(nc, "HTTP/1.1 %.*s\r\n", (int) h->len, h->p);
+          } else {
+            mg_printf(nc, "%s", "HTTP/1.1 200 OK\r\n");
+          }
+        }
+        nc->flags &= ~MG_F_USER_1;
+      }
+      if (!(nc->flags & MG_F_USER_1)) {
+        mg_forward(cgi_nc, nc);
+      }
+      break;
+    case MG_EV_CLOSE:
+      mg_http_free_proto_data_cgi(&mg_http_get_proto_data(nc)->cgi);
+      nc->flags |= MG_F_SEND_AND_CLOSE;
+      break;
+  }
+}
+
+MG_INTERNAL void mg_handle_cgi(struct mg_connection *nc, const char *prog,
+                               const struct mg_str *path_info,
+                               const struct http_message *hm,
+                               const struct mg_serve_http_opts *opts) {
+  struct mg_cgi_env_block blk;
+  char dir[MAX_PATH_SIZE];
+  const char *p;
+  sock_t fds[2];
+
+  DBG(("%p [%s]", nc, prog));
+  mg_prepare_cgi_environment(nc, prog, path_info, hm, opts, &blk);
+  /*
+   * CGI must be executed in its own directory. 'dir' must point to the
+   * directory containing executable program, 'p' must point to the
+   * executable program name relative to 'dir'.
+   */
+  if ((p = strrchr(prog, DIRSEP)) == NULL) {
+    snprintf(dir, sizeof(dir), "%s", ".");
+  } else {
+    snprintf(dir, sizeof(dir), "%.*s", (int) (p - prog), prog);
+    prog = p + 1;
+  }
+
+  /*
+   * Try to create socketpair in a loop until success. mg_socketpair()
+   * can be interrupted by a signal and fail.
+   * TODO(lsm): use sigaction to restart interrupted syscall
+   */
+  do {
+    mg_socketpair(fds, SOCK_STREAM);
+  } while (fds[0] == INVALID_SOCKET);
+
+  if (mg_start_process(opts->cgi_interpreter, prog, blk.buf, blk.vars, dir,
+                       fds[1]) != 0) {
+    size_t n = nc->recv_mbuf.len - (hm->message.len - hm->body.len);
+    struct mg_connection *cgi_nc =
+        mg_add_sock(nc->mgr, fds[0], mg_cgi_ev_handler);
+    struct mg_http_proto_data *cgi_pd = mg_http_get_proto_data(nc);
+    cgi_pd->cgi.cgi_nc = cgi_nc;
+    cgi_pd->cgi.cgi_nc->user_data = nc;
+    nc->flags |= MG_F_USER_1;
+    /* Push POST data to the CGI */
+    if (n > 0 && n < nc->recv_mbuf.len) {
+      mg_send(cgi_pd->cgi.cgi_nc, hm->body.p, n);
+    }
+    mbuf_remove(&nc->recv_mbuf, nc->recv_mbuf.len);
+  } else {
+    closesocket(fds[0]);
+    mg_http_send_error(nc, 500, "CGI failure");
+  }
+
+#ifndef _WIN32
+  closesocket(fds[1]); /* On Windows, CGI stdio thread closes that socket */
+#endif
+}
+
+MG_INTERNAL void mg_http_free_proto_data_cgi(struct mg_http_proto_data_cgi *d) {
+  if (d != NULL) {
+    if (d->cgi_nc != NULL) d->cgi_nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+    memset(d, 0, sizeof(struct mg_http_proto_data_cgi));
+  }
+}
+
+#endif /* MG_ENABLE_HTTP && MG_ENABLE_HTTP_CGI */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/http_ssi.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_HTTP && MG_ENABLE_HTTP_SSI && MG_ENABLE_FILESYSTEM
+
+static void mg_send_ssi_file(struct mg_connection *nc, struct http_message *hm,
+                             const char *path, FILE *fp, int include_level,
+                             const struct mg_serve_http_opts *opts);
+
+static void mg_send_file_data(struct mg_connection *nc, FILE *fp) {
+  char buf[BUFSIZ];
+  size_t n;
+  while ((n = fread(buf, 1, sizeof(buf), fp)) > 0) {
+    mg_send(nc, buf, n);
+  }
+}
+
+static void mg_do_ssi_include(struct mg_connection *nc, struct http_message *hm,
+                              const char *ssi, char *tag, int include_level,
+                              const struct mg_serve_http_opts *opts) {
+  char file_name[BUFSIZ], path[MAX_PATH_SIZE], *p;
+  FILE *fp;
+
+  /*
+   * sscanf() is safe here, since send_ssi_file() also uses buffer
+   * of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
+   */
+  if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
+    /* File name is relative to the webserver root */
+    snprintf(path, sizeof(path), "%s/%s", opts->document_root, file_name);
+  } else if (sscanf(tag, " abspath=\"%[^\"]\"", file_name) == 1) {
+    /*
+     * File name is relative to the webserver working directory
+     * or it is absolute system path
+     */
+    snprintf(path, sizeof(path), "%s", file_name);
+  } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1 ||
+             sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
+    /* File name is relative to the currect document */
+    snprintf(path, sizeof(path), "%s", ssi);
+    if ((p = strrchr(path, DIRSEP)) != NULL) {
+      p[1] = '\0';
+    }
+    snprintf(path + strlen(path), sizeof(path) - strlen(path), "%s", file_name);
+  } else {
+    mg_printf(nc, "Bad SSI #include: [%s]", tag);
+    return;
+  }
+
+  if ((fp = mg_fopen(path, "rb")) == NULL) {
+    mg_printf(nc, "SSI include error: mg_fopen(%s): %s", path,
+              strerror(mg_get_errno()));
+  } else {
+    mg_set_close_on_exec((sock_t) fileno(fp));
+    if (mg_match_prefix(opts->ssi_pattern, strlen(opts->ssi_pattern), path) >
+        0) {
+      mg_send_ssi_file(nc, hm, path, fp, include_level + 1, opts);
+    } else {
+      mg_send_file_data(nc, fp);
+    }
+    fclose(fp);
+  }
+}
+
+#if MG_ENABLE_HTTP_SSI_EXEC
+static void do_ssi_exec(struct mg_connection *nc, char *tag) {
+  char cmd[BUFSIZ];
+  FILE *fp;
+
+  if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
+    mg_printf(nc, "Bad SSI #exec: [%s]", tag);
+  } else if ((fp = popen(cmd, "r")) == NULL) {
+    mg_printf(nc, "Cannot SSI #exec: [%s]: %s", cmd, strerror(mg_get_errno()));
+  } else {
+    mg_send_file_data(nc, fp);
+    pclose(fp);
+  }
+}
+#endif /* MG_ENABLE_HTTP_SSI_EXEC */
+
+/*
+ * SSI directive has the following format:
+ * <!--#directive parameter=value parameter=value -->
+ */
+static void mg_send_ssi_file(struct mg_connection *nc, struct http_message *hm,
+                             const char *path, FILE *fp, int include_level,
+                             const struct mg_serve_http_opts *opts) {
+  static const struct mg_str btag = MG_MK_STR("<!--#");
+  static const struct mg_str d_include = MG_MK_STR("include");
+  static const struct mg_str d_call = MG_MK_STR("call");
+#if MG_ENABLE_HTTP_SSI_EXEC
+  static const struct mg_str d_exec = MG_MK_STR("exec");
+#endif
+  char buf[BUFSIZ], *p = buf + btag.len; /* p points to SSI directive */
+  int ch, len, in_ssi_tag;
+
+  if (include_level > 10) {
+    mg_printf(nc, "SSI #include level is too deep (%s)", path);
+    return;
+  }
+
+  in_ssi_tag = len = 0;
+  while ((ch = fgetc(fp)) != EOF) {
+    if (in_ssi_tag && ch == '>' && buf[len - 1] == '-' && buf[len - 2] == '-') {
+      size_t i = len - 2;
+      in_ssi_tag = 0;
+
+      /* Trim closing --> */
+      buf[i--] = '\0';
+      while (i > 0 && buf[i] == ' ') {
+        buf[i--] = '\0';
+      }
+
+      /* Handle known SSI directives */
+      if (strncmp(p, d_include.p, d_include.len) == 0) {
+        mg_do_ssi_include(nc, hm, path, p + d_include.len + 1, include_level,
+                          opts);
+      } else if (strncmp(p, d_call.p, d_call.len) == 0) {
+        struct mg_ssi_call_ctx cctx;
+        memset(&cctx, 0, sizeof(cctx));
+        cctx.req = hm;
+        cctx.file = mg_mk_str(path);
+        cctx.arg = mg_mk_str(p + d_call.len + 1);
+        mg_call(nc, NULL, MG_EV_SSI_CALL,
+                (void *) cctx.arg.p); /* NUL added above */
+        mg_call(nc, NULL, MG_EV_SSI_CALL_CTX, &cctx);
+#if MG_ENABLE_HTTP_SSI_EXEC
+      } else if (strncmp(p, d_exec.p, d_exec.len) == 0) {
+        do_ssi_exec(nc, p + d_exec.len + 1);
+#endif
+      } else {
+        /* Silently ignore unknown SSI directive. */
+      }
+      len = 0;
+    } else if (ch == '<') {
+      in_ssi_tag = 1;
+      if (len > 0) {
+        mg_send(nc, buf, (size_t) len);
+      }
+      len = 0;
+      buf[len++] = ch & 0xff;
+    } else if (in_ssi_tag) {
+      if (len == (int) btag.len && strncmp(buf, btag.p, btag.len) != 0) {
+        /* Not an SSI tag */
+        in_ssi_tag = 0;
+      } else if (len == (int) sizeof(buf) - 2) {
+        mg_printf(nc, "%s: SSI tag is too large", path);
+        len = 0;
+      }
+      buf[len++] = ch & 0xff;
+    } else {
+      buf[len++] = ch & 0xff;
+      if (len == (int) sizeof(buf)) {
+        mg_send(nc, buf, (size_t) len);
+        len = 0;
+      }
+    }
+  }
+
+  /* Send the rest of buffered data */
+  if (len > 0) {
+    mg_send(nc, buf, (size_t) len);
+  }
+}
+
+MG_INTERNAL void mg_handle_ssi_request(struct mg_connection *nc,
+                                       struct http_message *hm,
+                                       const char *path,
+                                       const struct mg_serve_http_opts *opts) {
+  FILE *fp;
+  struct mg_str mime_type;
+  DBG(("%p %s", nc, path));
+
+  if ((fp = mg_fopen(path, "rb")) == NULL) {
+    mg_http_send_error(nc, 404, NULL);
+  } else {
+    mg_set_close_on_exec((sock_t) fileno(fp));
+
+    mime_type = mg_get_mime_type(path, "text/plain", opts);
+    mg_send_response_line(nc, 200, opts->extra_headers);
+    mg_printf(nc,
+              "Content-Type: %.*s\r\n"
+              "Connection: close\r\n\r\n",
+              (int) mime_type.len, mime_type.p);
+    mg_send_ssi_file(nc, hm, path, fp, 0, opts);
+    fclose(fp);
+    nc->flags |= MG_F_SEND_AND_CLOSE;
+  }
+}
+
+#endif /* MG_ENABLE_HTTP_SSI && MG_ENABLE_HTTP && MG_ENABLE_FILESYSTEM */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/http_webdav.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_HTTP && MG_ENABLE_HTTP_WEBDAV
+
+MG_INTERNAL int mg_is_dav_request(const struct mg_str *s) {
+  static const char *methods[] = {
+    "PUT",
+    "DELETE",
+    "MKCOL",
+    "PROPFIND",
+    "MOVE"
+#if MG_ENABLE_FAKE_DAVLOCK
+    ,
+    "LOCK",
+    "UNLOCK"
+#endif
+  };
+  size_t i;
+
+  for (i = 0; i < ARRAY_SIZE(methods); i++) {
+    if (mg_vcmp(s, methods[i]) == 0) {
+      return 1;
+    }
+  }
+
+  return 0;
+}
+
+static int mg_mkdir(const char *path, uint32_t mode) {
+#ifndef _WIN32
+  return mkdir(path, mode);
+#else
+  (void) mode;
+  return _mkdir(path);
+#endif
+}
+
+static void mg_print_props(struct mg_connection *nc, const char *name,
+                           cs_stat_t *stp) {
+  char mtime[64], buf[MAX_PATH_SIZE * 3];
+  time_t t = stp->st_mtime; /* store in local variable for NDK compile */
+  mg_gmt_time_string(mtime, sizeof(mtime), &t);
+  mg_url_encode(name, strlen(name), buf, sizeof(buf));
+  mg_printf(nc,
+            "<d:response>"
+            "<d:href>%s</d:href>"
+            "<d:propstat>"
+            "<d:prop>"
+            "<d:resourcetype>%s</d:resourcetype>"
+            "<d:getcontentlength>%" INT64_FMT
+            "</d:getcontentlength>"
+            "<d:getlastmodified>%s</d:getlastmodified>"
+            "</d:prop>"
+            "<d:status>HTTP/1.1 200 OK</d:status>"
+            "</d:propstat>"
+            "</d:response>\n",
+            buf, S_ISDIR(stp->st_mode) ? "<d:collection/>" : "",
+            (int64_t) stp->st_size, mtime);
+}
+
+MG_INTERNAL void mg_handle_propfind(struct mg_connection *nc, const char *path,
+                                    cs_stat_t *stp, struct http_message *hm,
+                                    struct mg_serve_http_opts *opts) {
+  static const char header[] =
+      "HTTP/1.1 207 Multi-Status\r\n"
+      "Connection: close\r\n"
+      "Content-Type: text/xml; charset=utf-8\r\n\r\n"
+      "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
+      "<d:multistatus xmlns:d='DAV:'>\n";
+  static const char footer[] = "</d:multistatus>\n";
+  const struct mg_str *depth = mg_get_http_header(hm, "Depth");
+
+  /* Print properties for the requested resource itself */
+  if (S_ISDIR(stp->st_mode) &&
+      strcmp(opts->enable_directory_listing, "yes") != 0) {
+    mg_printf(nc, "%s", "HTTP/1.1 403 Directory Listing Denied\r\n\r\n");
+  } else {
+    char uri[MAX_PATH_SIZE];
+    mg_send(nc, header, sizeof(header) - 1);
+    snprintf(uri, sizeof(uri), "%.*s", (int) hm->uri.len, hm->uri.p);
+    mg_print_props(nc, uri, stp);
+    if (S_ISDIR(stp->st_mode) && (depth == NULL || mg_vcmp(depth, "0") != 0)) {
+      mg_scan_directory(nc, path, opts, mg_print_props);
+    }
+    mg_send(nc, footer, sizeof(footer) - 1);
+    nc->flags |= MG_F_SEND_AND_CLOSE;
+  }
+}
+
+#if MG_ENABLE_FAKE_DAVLOCK
+/*
+ * Windows explorer (probably there are another WebDav clients like it)
+ * requires LOCK support in webdav. W/out this, it still works, but fails
+ * to save file: shows error message and offers "Save As".
+ * "Save as" works, but this message is very annoying.
+ * This is fake lock, which doesn't lock something, just returns LOCK token,
+ * UNLOCK always answers "OK".
+ * With this fake LOCK Windows Explorer looks happy and saves file.
+ * NOTE: that is not DAV LOCK imlementation, it is just a way to shut up
+ * Windows native DAV client. This is why FAKE LOCK is not enabed by default
+ */
+MG_INTERNAL void mg_handle_lock(struct mg_connection *nc, const char *path) {
+  static const char *reply =
+      "HTTP/1.1 207 Multi-Status\r\n"
+      "Connection: close\r\n"
+      "Content-Type: text/xml; charset=utf-8\r\n\r\n"
+      "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
+      "<d:multistatus xmlns:d='DAV:'>\n"
+      "<D:lockdiscovery>\n"
+      "<D:activelock>\n"
+      "<D:locktoken>\n"
+      "<D:href>\n"
+      "opaquelocktoken:%s%u"
+      "</D:href>"
+      "</D:locktoken>"
+      "</D:activelock>\n"
+      "</D:lockdiscovery>"
+      "</d:multistatus>\n";
+  mg_printf(nc, reply, path, (unsigned int) mg_time());
+  nc->flags |= MG_F_SEND_AND_CLOSE;
+}
+#endif
+
+MG_INTERNAL void mg_handle_mkcol(struct mg_connection *nc, const char *path,
+                                 struct http_message *hm) {
+  int status_code = 500;
+  if (hm->body.len != (size_t) ~0 && hm->body.len > 0) {
+    status_code = 415;
+  } else if (!mg_mkdir(path, 0755)) {
+    status_code = 201;
+  } else if (errno == EEXIST) {
+    status_code = 405;
+  } else if (errno == EACCES) {
+    status_code = 403;
+  } else if (errno == ENOENT) {
+    status_code = 409;
+  } else {
+    status_code = 500;
+  }
+  mg_http_send_error(nc, status_code, NULL);
+}
+
+static int mg_remove_directory(const struct mg_serve_http_opts *opts,
+                               const char *dir) {
+  char path[MAX_PATH_SIZE];
+  struct dirent *dp;
+  cs_stat_t st;
+  DIR *dirp;
+
+  if ((dirp = opendir(dir)) == NULL) return 0;
+
+  while ((dp = readdir(dirp)) != NULL) {
+    if (mg_is_file_hidden((const char *) dp->d_name, opts, 1)) {
+      continue;
+    }
+    snprintf(path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
+    mg_stat(path, &st);
+    if (S_ISDIR(st.st_mode)) {
+      mg_remove_directory(opts, path);
+    } else {
+      remove(path);
+    }
+  }
+  closedir(dirp);
+  rmdir(dir);
+
+  return 1;
+}
+
+MG_INTERNAL void mg_handle_move(struct mg_connection *c,
+                                const struct mg_serve_http_opts *opts,
+                                const char *path, struct http_message *hm) {
+  const struct mg_str *dest = mg_get_http_header(hm, "Destination");
+  if (dest == NULL) {
+    mg_http_send_error(c, 411, NULL);
+  } else {
+    const char *p = (char *) memchr(dest->p, '/', dest->len);
+    if (p != NULL && p[1] == '/' &&
+        (p = (char *) memchr(p + 2, '/', dest->p + dest->len - p)) != NULL) {
+      char buf[MAX_PATH_SIZE];
+      snprintf(buf, sizeof(buf), "%s%.*s", opts->dav_document_root,
+               (int) (dest->p + dest->len - p), p);
+      if (rename(path, buf) == 0) {
+        mg_http_send_error(c, 200, NULL);
+      } else {
+        mg_http_send_error(c, 418, NULL);
+      }
+    } else {
+      mg_http_send_error(c, 500, NULL);
+    }
+  }
+}
+
+MG_INTERNAL void mg_handle_delete(struct mg_connection *nc,
+                                  const struct mg_serve_http_opts *opts,
+                                  const char *path) {
+  cs_stat_t st;
+  if (mg_stat(path, &st) != 0) {
+    mg_http_send_error(nc, 404, NULL);
+  } else if (S_ISDIR(st.st_mode)) {
+    mg_remove_directory(opts, path);
+    mg_http_send_error(nc, 204, NULL);
+  } else if (remove(path) == 0) {
+    mg_http_send_error(nc, 204, NULL);
+  } else {
+    mg_http_send_error(nc, 423, NULL);
+  }
+}
+
+/* Return -1 on error, 1 on success. */
+static int mg_create_itermediate_directories(const char *path) {
+  const char *s;
+
+  /* Create intermediate directories if they do not exist */
+  for (s = path + 1; *s != '\0'; s++) {
+    if (*s == '/') {
+      char buf[MAX_PATH_SIZE];
+      cs_stat_t st;
+      snprintf(buf, sizeof(buf), "%.*s", (int) (s - path), path);
+      buf[sizeof(buf) - 1] = '\0';
+      if (mg_stat(buf, &st) != 0 && mg_mkdir(buf, 0755) != 0) {
+        return -1;
+      }
+    }
+  }
+
+  return 1;
+}
+
+MG_INTERNAL void mg_handle_put(struct mg_connection *nc, const char *path,
+                               struct http_message *hm) {
+  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
+  cs_stat_t st;
+  const struct mg_str *cl_hdr = mg_get_http_header(hm, "Content-Length");
+  int rc, status_code = mg_stat(path, &st) == 0 ? 200 : 201;
+
+  mg_http_free_proto_data_file(&pd->file);
+  if ((rc = mg_create_itermediate_directories(path)) == 0) {
+    mg_printf(nc, "HTTP/1.1 %d OK\r\nContent-Length: 0\r\n\r\n", status_code);
+  } else if (rc == -1) {
+    mg_http_send_error(nc, 500, NULL);
+  } else if (cl_hdr == NULL) {
+    mg_http_send_error(nc, 411, NULL);
+  } else if ((pd->file.fp = mg_fopen(path, "w+b")) == NULL) {
+    mg_http_send_error(nc, 500, NULL);
+  } else {
+    const struct mg_str *range_hdr = mg_get_http_header(hm, "Content-Range");
+    int64_t r1 = 0, r2 = 0;
+    pd->file.type = DATA_PUT;
+    mg_set_close_on_exec((sock_t) fileno(pd->file.fp));
+    pd->file.cl = to64(cl_hdr->p);
+    if (range_hdr != NULL &&
+        mg_http_parse_range_header(range_hdr, &r1, &r2) > 0) {
+      status_code = 206;
+      fseeko(pd->file.fp, r1, SEEK_SET);
+      pd->file.cl = r2 > r1 ? r2 - r1 + 1 : pd->file.cl - r1;
+    }
+    mg_printf(nc, "HTTP/1.1 %d OK\r\nContent-Length: 0\r\n\r\n", status_code);
+    /* Remove HTTP request from the mbuf, leave only payload */
+    mbuf_remove(&nc->recv_mbuf, hm->message.len - hm->body.len);
+    mg_http_transfer_file_data(nc);
+  }
+}
+
+#endif /* MG_ENABLE_HTTP && MG_ENABLE_HTTP_WEBDAV */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/http_websocket.c"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_HTTP && MG_ENABLE_HTTP_WEBSOCKET
+
+#ifndef MG_WEBSOCKET_PING_INTERVAL_SECONDS
+#define MG_WEBSOCKET_PING_INTERVAL_SECONDS 5
+#endif
+
+#define MG_WS_NO_HOST_HEADER_MAGIC ((char *) 0x1)
+
+static int mg_is_ws_fragment(unsigned char flags) {
+  return (flags & 0x80) == 0 || (flags & 0x0f) == 0;
+}
+
+static int mg_is_ws_first_fragment(unsigned char flags) {
+  return (flags & 0x80) == 0 && (flags & 0x0f) != 0;
+}
+
+static void mg_handle_incoming_websocket_frame(struct mg_connection *nc,
+                                               struct websocket_message *wsm) {
+  if (wsm->flags & 0x8) {
+    mg_call(nc, nc->handler, MG_EV_WEBSOCKET_CONTROL_FRAME, wsm);
+  } else {
+    mg_call(nc, nc->handler, MG_EV_WEBSOCKET_FRAME, wsm);
+  }
+}
+
+static int mg_deliver_websocket_data(struct mg_connection *nc) {
+  /* Using unsigned char *, cause of integer arithmetic below */
+  uint64_t i, data_len = 0, frame_len = 0, buf_len = nc->recv_mbuf.len, len,
+              mask_len = 0, header_len = 0;
+  unsigned char *p = (unsigned char *) nc->recv_mbuf.buf, *buf = p,
+                *e = p + buf_len;
+  unsigned *sizep = (unsigned *) &p[1]; /* Size ptr for defragmented frames */
+  int ok, reass = buf_len > 0 && mg_is_ws_fragment(p[0]) &&
+                  !(nc->flags & MG_F_WEBSOCKET_NO_DEFRAG);
+
+  /* If that's a continuation frame that must be reassembled, handle it */
+  if (reass && !mg_is_ws_first_fragment(p[0]) &&
+      buf_len >= 1 + sizeof(*sizep) && buf_len >= 1 + sizeof(*sizep) + *sizep) {
+    buf += 1 + sizeof(*sizep) + *sizep;
+    buf_len -= 1 + sizeof(*sizep) + *sizep;
+  }
+
+  if (buf_len >= 2) {
+    len = buf[1] & 127;
+    mask_len = buf[1] & 128 ? 4 : 0;
+    if (len < 126 && buf_len >= mask_len) {
+      data_len = len;
+      header_len = 2 + mask_len;
+    } else if (len == 126 && buf_len >= 4 + mask_len) {
+      header_len = 4 + mask_len;
+      data_len = ntohs(*(uint16_t *) &buf[2]);
+    } else if (buf_len >= 10 + mask_len) {
+      header_len = 10 + mask_len;
+      data_len = (((uint64_t) ntohl(*(uint32_t *) &buf[2])) << 32) +
+                 ntohl(*(uint32_t *) &buf[6]);
+    }
+  }
+
+  frame_len = header_len + data_len;
+  ok = frame_len > 0 && frame_len <= buf_len;
+
+  if (ok) {
+    struct websocket_message wsm;
+
+    wsm.size = (size_t) data_len;
+    wsm.data = buf + header_len;
+    wsm.flags = buf[0];
+
+    /* Apply mask if necessary */
+    if (mask_len > 0) {
+      for (i = 0; i < data_len; i++) {
+        buf[i + header_len] ^= (buf + header_len - mask_len)[i % 4];
+      }
+    }
+
+    if (reass) {
+      /* On first fragmented frame, nullify size */
+      if (mg_is_ws_first_fragment(wsm.flags)) {
+        mbuf_resize(&nc->recv_mbuf, nc->recv_mbuf.size + sizeof(*sizep));
+        p[0] &= ~0x0f; /* Next frames will be treated as continuation */
+        buf = p + 1 + sizeof(*sizep);
+        *sizep = 0; /* TODO(lsm): fix. this can stomp over frame data */
+      }
+
+      /* Append this frame to the reassembled buffer */
+      memmove(buf, wsm.data, e - wsm.data);
+      (*sizep) += wsm.size;
+      nc->recv_mbuf.len -= wsm.data - buf;
+
+      /* On last fragmented frame - call user handler and remove data */
+      if (wsm.flags & 0x80) {
+        wsm.data = p + 1 + sizeof(*sizep);
+        wsm.size = *sizep;
+        mg_handle_incoming_websocket_frame(nc, &wsm);
+        mbuf_remove(&nc->recv_mbuf, 1 + sizeof(*sizep) + *sizep);
+      }
+    } else {
+      /* TODO(lsm): properly handle OOB control frames during defragmentation */
+      mg_handle_incoming_websocket_frame(nc, &wsm);
+      mbuf_remove(&nc->recv_mbuf, (size_t) frame_len); /* Cleanup frame */
+    }
+
+    /* If client closes, close too */
+    if ((buf[0] & 0x0f) == WEBSOCKET_OP_CLOSE) {
+      nc->flags |= MG_F_SEND_AND_CLOSE;
+    }
+  }
+
+  return ok;
+}
+
+struct ws_mask_ctx {
+  size_t pos; /* zero means unmasked */
+  uint32_t mask;
+};
+
+static uint32_t mg_ws_random_mask(void) {
+  uint32_t mask;
+/*
+ * The spec requires WS client to generate hard to
+ * guess mask keys. From RFC6455, Section 5.3:
+ *
+ * The unpredictability of the masking key is essential to prevent
+ * authors of malicious applications from selecting the bytes that appear on
+ * the wire.
+ *
+ * Hence this feature is essential when the actual end user of this API
+ * is untrusted code that wouldn't have access to a lower level net API
+ * anyway (e.g. web browsers). Hence this feature is low prio for most
+ * mongoose use cases and thus can be disabled, e.g. when porting to a platform
+ * that lacks rand().
+ */
+#if MG_DISABLE_WS_RANDOM_MASK
+  mask = 0xefbeadde; /* generated with a random number generator, I swear */
+#else
+  if (sizeof(long) >= 4) {
+    mask = (uint32_t) rand();
+  } else if (sizeof(long) == 2) {
+    mask = (uint32_t) rand() << 16 | (uint32_t) rand();
+  }
+#endif
+  return mask;
+}
+
+static void mg_send_ws_header(struct mg_connection *nc, int op, size_t len,
+                              struct ws_mask_ctx *ctx) {
+  int header_len;
+  unsigned char header[10];
+
+  header[0] = (op & WEBSOCKET_DONT_FIN ? 0x0 : 0x80) + (op & 0x0f);
+  if (len < 126) {
+    header[1] = (unsigned char) len;
+    header_len = 2;
+  } else if (len < 65535) {
+    uint16_t tmp = htons((uint16_t) len);
+    header[1] = 126;
+    memcpy(&header[2], &tmp, sizeof(tmp));
+    header_len = 4;
+  } else {
+    uint32_t tmp;
+    header[1] = 127;
+    tmp = htonl((uint32_t)((uint64_t) len >> 32));
+    memcpy(&header[2], &tmp, sizeof(tmp));
+    tmp = htonl((uint32_t)(len & 0xffffffff));
+    memcpy(&header[6], &tmp, sizeof(tmp));
+    header_len = 10;
+  }
+
+  /* client connections enable masking */
+  if (nc->listener == NULL) {
+    header[1] |= 1 << 7; /* set masking flag */
+    mg_send(nc, header, header_len);
+    ctx->mask = mg_ws_random_mask();
+    mg_send(nc, &ctx->mask, sizeof(ctx->mask));
+    ctx->pos = nc->send_mbuf.len;
+  } else {
+    mg_send(nc, header, header_len);
+    ctx->pos = 0;
+  }
+}
+
+static void mg_ws_mask_frame(struct mbuf *mbuf, struct ws_mask_ctx *ctx) {
+  size_t i;
+  if (ctx->pos == 0) return;
+  for (i = 0; i < (mbuf->len - ctx->pos); i++) {
+    mbuf->buf[ctx->pos + i] ^= ((char *) &ctx->mask)[i % 4];
+  }
+}
+
+void mg_send_websocket_frame(struct mg_connection *nc, int op, const void *data,
+                             size_t len) {
+  struct ws_mask_ctx ctx;
+  DBG(("%p %d %d", nc, op, (int) len));
+  mg_send_ws_header(nc, op, len, &ctx);
+  mg_send(nc, data, len);
+
+  mg_ws_mask_frame(&nc->send_mbuf, &ctx);
+
+  if (op == WEBSOCKET_OP_CLOSE) {
+    nc->flags |= MG_F_SEND_AND_CLOSE;
+  }
+}
+
+void mg_send_websocket_framev(struct mg_connection *nc, int op,
+                              const struct mg_str *strv, int strvcnt) {
+  struct ws_mask_ctx ctx;
+  int i;
+  int len = 0;
+  for (i = 0; i < strvcnt; i++) {
+    len += strv[i].len;
+  }
+
+  mg_send_ws_header(nc, op, len, &ctx);
+
+  for (i = 0; i < strvcnt; i++) {
+    mg_send(nc, strv[i].p, strv[i].len);
+  }
+
+  mg_ws_mask_frame(&nc->send_mbuf, &ctx);
+
+  if (op == WEBSOCKET_OP_CLOSE) {
+    nc->flags |= MG_F_SEND_AND_CLOSE;
+  }
+}
+
+void mg_printf_websocket_frame(struct mg_connection *nc, int op,
+                               const char *fmt, ...) {
+  char mem[MG_VPRINTF_BUFFER_SIZE], *buf = mem;
+  va_list ap;
+  int len;
+
+  va_start(ap, fmt);
+  if ((len = mg_avprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
+    mg_send_websocket_frame(nc, op, buf, len);
+  }
+  va_end(ap);
+
+  if (buf != mem && buf != NULL) {
+    MG_FREE(buf);
+  }
+}
+
+MG_INTERNAL void mg_ws_handler(struct mg_connection *nc, int ev,
+                               void *ev_data) {
+  mg_call(nc, nc->handler, ev, ev_data);
+
+  switch (ev) {
+    case MG_EV_RECV:
+      do {
+      } while (mg_deliver_websocket_data(nc));
+      break;
+    case MG_EV_POLL:
+      /* Ping idle websocket connections */
+      {
+        time_t now = *(time_t *) ev_data;
+        if (nc->flags & MG_F_IS_WEBSOCKET &&
+            now > nc->last_io_time + MG_WEBSOCKET_PING_INTERVAL_SECONDS) {
+          mg_send_websocket_frame(nc, WEBSOCKET_OP_PING, "", 0);
+        }
+      }
+      break;
+    default:
+      break;
+  }
+}
+
+#ifndef MG_EXT_SHA1
+static void mg_hash_sha1_v(size_t num_msgs, const uint8_t *msgs[],
+                           const size_t *msg_lens, uint8_t *digest) {
+  size_t i;
+  cs_sha1_ctx sha_ctx;
+  cs_sha1_init(&sha_ctx);
+  for (i = 0; i < num_msgs; i++) {
+    cs_sha1_update(&sha_ctx, msgs[i], msg_lens[i]);
+  }
+  cs_sha1_final(digest, &sha_ctx);
+}
+#else
+extern void mg_hash_sha1_v(size_t num_msgs, const uint8_t *msgs[],
+                           const size_t *msg_lens, uint8_t *digest);
+#endif
+
+MG_INTERNAL void mg_ws_handshake(struct mg_connection *nc,
+                                 const struct mg_str *key) {
+  static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
+  const uint8_t *msgs[2] = {(const uint8_t *) key->p, (const uint8_t *) magic};
+  const size_t msg_lens[2] = {key->len, 36};
+  unsigned char sha[20];
+  char b64_sha[30];
+
+  mg_hash_sha1_v(2, msgs, msg_lens, sha);
+  mg_base64_encode(sha, sizeof(sha), b64_sha);
+  mg_printf(nc, "%s%s%s",
+            "HTTP/1.1 101 Switching Protocols\r\n"
+            "Upgrade: websocket\r\n"
+            "Connection: Upgrade\r\n"
+            "Sec-WebSocket-Accept: ",
+            b64_sha, "\r\n\r\n");
+  DBG(("%p %.*s %s", nc, (int) key->len, key->p, b64_sha));
+}
+
+void mg_send_websocket_handshake2(struct mg_connection *nc, const char *path,
+                                  const char *host, const char *protocol,
+                                  const char *extra_headers) {
+  mg_send_websocket_handshake3(nc, path, host, protocol, extra_headers, NULL,
+                               NULL);
+}
+
+void mg_send_websocket_handshake3(struct mg_connection *nc, const char *path,
+                                  const char *host, const char *protocol,
+                                  const char *extra_headers, const char *user,
+                                  const char *pass) {
+  struct mbuf auth;
+  char key[25];
+  uint32_t nonce[4];
+  nonce[0] = mg_ws_random_mask();
+  nonce[1] = mg_ws_random_mask();
+  nonce[2] = mg_ws_random_mask();
+  nonce[3] = mg_ws_random_mask();
+  mg_base64_encode((unsigned char *) &nonce, sizeof(nonce), key);
+
+  mbuf_init(&auth, 0);
+  if (user != NULL) {
+    mg_basic_auth_header(user, pass, &auth);
+  }
+
+  /*
+   * NOTE: the  (auth.buf == NULL ? "" : auth.buf) is because cc3200 libc is
+   * broken: it doesn't like zero length to be passed to %.*s
+   * i.e. sprintf("f%.*so", (int)0, NULL), yields `f\0o`.
+   * because it handles NULL specially (and incorrectly).
+   */
+  mg_printf(nc,
+            "GET %s HTTP/1.1\r\n"
+            "Upgrade: websocket\r\n"
+            "Connection: Upgrade\r\n"
+            "%.*s"
+            "Sec-WebSocket-Version: 13\r\n"
+            "Sec-WebSocket-Key: %s\r\n",
+            path, (int) auth.len, (auth.buf == NULL ? "" : auth.buf), key);
+
+  /* TODO(mkm): take default hostname from http proto data if host == NULL */
+  if (host != MG_WS_NO_HOST_HEADER_MAGIC) {
+    mg_printf(nc, "Host: %s\r\n", host);
+  }
+  if (protocol != NULL) {
+    mg_printf(nc, "Sec-WebSocket-Protocol: %s\r\n", protocol);
+  }
+  if (extra_headers != NULL) {
+    mg_printf(nc, "%s", extra_headers);
+  }
+  mg_printf(nc, "\r\n");
+
+  mbuf_free(&auth);
+}
+
+void mg_send_websocket_handshake(struct mg_connection *nc, const char *path,
+                                 const char *extra_headers) {
+  mg_send_websocket_handshake2(nc, path, MG_WS_NO_HOST_HEADER_MAGIC, NULL,
+                               extra_headers);
+}
+
+struct mg_connection *mg_connect_ws_opt(struct mg_mgr *mgr,
+                                        mg_event_handler_t ev_handler,
+                                        struct mg_connect_opts opts,
+                                        const char *url, const char *protocol,
+                                        const char *extra_headers) {
+  char *user = NULL, *pass = NULL, *addr = NULL;
+  const char *path = NULL;
+  struct mg_connection *nc =
+      mg_connect_http_base(mgr, ev_handler, opts, "ws://", "wss://", url, &path,
+                           &user, &pass, &addr);
+
+  if (nc != NULL) {
+    mg_send_websocket_handshake3(nc, path, addr, protocol, extra_headers, user,
+                                 pass);
+  }
+
+  MG_FREE(addr);
+  MG_FREE(user);
+  MG_FREE(pass);
+  return nc;
+}
+
+struct mg_connection *mg_connect_ws(struct mg_mgr *mgr,
+                                    mg_event_handler_t ev_handler,
+                                    const char *url, const char *protocol,
+                                    const char *extra_headers) {
+  struct mg_connect_opts opts;
+  memset(&opts, 0, sizeof(opts));
+  return mg_connect_ws_opt(mgr, ev_handler, opts, url, protocol, extra_headers);
+}
+#endif /* MG_ENABLE_HTTP && MG_ENABLE_HTTP_WEBSOCKET */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/util.c"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/* Amalgamated: #include "common/base64.h" */
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/util.h" */
+
+/* For platforms with limited libc */
+#ifndef MAX
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+#endif
+
+const char *mg_skip(const char *s, const char *end, const char *delims,
+                    struct mg_str *v) {
+  v->p = s;
+  while (s < end && strchr(delims, *(unsigned char *) s) == NULL) s++;
+  v->len = s - v->p;
+  while (s < end && strchr(delims, *(unsigned char *) s) != NULL) s++;
+  return s;
+}
+
+static int lowercase(const char *s) {
+  return tolower(*(const unsigned char *) s);
+}
+
+#if MG_ENABLE_FILESYSTEM
+int mg_stat(const char *path, cs_stat_t *st) {
+#ifdef _WIN32
+  wchar_t wpath[MAX_PATH_SIZE];
+  to_wchar(path, wpath, ARRAY_SIZE(wpath));
+  DBG(("[%ls] -> %d", wpath, _wstati64(wpath, st)));
+  return _wstati64(wpath, st);
+#else
+  return stat(path, st);
+#endif
+}
+
+FILE *mg_fopen(const char *path, const char *mode) {
+#ifdef _WIN32
+  wchar_t wpath[MAX_PATH_SIZE], wmode[10];
+  to_wchar(path, wpath, ARRAY_SIZE(wpath));
+  to_wchar(mode, wmode, ARRAY_SIZE(wmode));
+  return _wfopen(wpath, wmode);
+#else
+  return fopen(path, mode);
+#endif
+}
+
+int mg_open(const char *path, int flag, int mode) { /* LCOV_EXCL_LINE */
+#if defined(_WIN32) && !defined(WINCE)
+  wchar_t wpath[MAX_PATH_SIZE];
+  to_wchar(path, wpath, ARRAY_SIZE(wpath));
+  return _wopen(wpath, flag, mode);
+#else
+  return open(path, flag, mode); /* LCOV_EXCL_LINE */
+#endif
+}
+#endif
+
+void mg_base64_encode(const unsigned char *src, int src_len, char *dst) {
+  cs_base64_encode(src, src_len, dst);
+}
+
+int mg_base64_decode(const unsigned char *s, int len, char *dst) {
+  return cs_base64_decode(s, len, dst, NULL);
+}
+
+#if MG_ENABLE_THREADS
+void *mg_start_thread(void *(*f)(void *), void *p) {
+#ifdef WINCE
+  return (void *) CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE) f, p, 0, NULL);
+#elif defined(_WIN32)
+  return (void *) _beginthread((void(__cdecl *) (void *) ) f, 0, p);
+#else
+  pthread_t thread_id = (pthread_t) 0;
+  pthread_attr_t attr;
+
+  (void) pthread_attr_init(&attr);
+  (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+
+#if defined(MG_STACK_SIZE) && MG_STACK_SIZE > 1
+  (void) pthread_attr_setstacksize(&attr, MG_STACK_SIZE);
+#endif
+
+  pthread_create(&thread_id, &attr, f, p);
+  pthread_attr_destroy(&attr);
+
+  return (void *) thread_id;
+#endif
+}
+#endif /* MG_ENABLE_THREADS */
+
+/* Set close-on-exec bit for a given socket. */
+void mg_set_close_on_exec(sock_t sock) {
+#if defined(_WIN32) && !defined(WINCE)
+  (void) SetHandleInformation((HANDLE) sock, HANDLE_FLAG_INHERIT, 0);
+#elif defined(__unix__)
+  fcntl(sock, F_SETFD, FD_CLOEXEC);
+#else
+  (void) sock;
+#endif
+}
+
+void mg_sock_addr_to_str(const union socket_address *sa, char *buf, size_t len,
+                         int flags) {
+  int is_v6;
+  if (buf == NULL || len <= 0) return;
+  memset(buf, 0, len);
+#if MG_ENABLE_IPV6
+  is_v6 = sa->sa.sa_family == AF_INET6;
+#else
+  is_v6 = 0;
+#endif
+  if (flags & MG_SOCK_STRINGIFY_IP) {
+#if MG_ENABLE_IPV6
+    const void *addr = NULL;
+    char *start = buf;
+    socklen_t capacity = len;
+    if (!is_v6) {
+      addr = &sa->sin.sin_addr;
+    } else {
+      addr = (void *) &sa->sin6.sin6_addr;
+      if (flags & MG_SOCK_STRINGIFY_PORT) {
+        *buf = '[';
+        start++;
+        capacity--;
+      }
+    }
+    if (inet_ntop(sa->sa.sa_family, addr, start, capacity) == NULL) {
+      goto cleanup;
+    }
+#elif defined(_WIN32) || MG_LWIP || (MG_NET_IF == MG_NET_IF_PIC32)
+    /* Only Windoze Vista (and newer) have inet_ntop() */
+    char *addr_str = inet_ntoa(sa->sin.sin_addr);
+    if (addr_str != NULL) {
+      strncpy(buf, inet_ntoa(sa->sin.sin_addr), len - 1);
+    } else {
+      goto cleanup;
+    }
+#else
+    if (inet_ntop(AF_INET, (void *) &sa->sin.sin_addr, buf, len - 1) == NULL) {
+      goto cleanup;
+    }
+#endif
+  }
+  if (flags & MG_SOCK_STRINGIFY_PORT) {
+    int port = ntohs(sa->sin.sin_port);
+    if (flags & MG_SOCK_STRINGIFY_IP) {
+      int buf_len = strlen(buf);
+      snprintf(buf + buf_len, len - (buf_len + 1), "%s:%d", (is_v6 ? "]" : ""),
+               port);
+    } else {
+      snprintf(buf, len, "%d", port);
+    }
+  }
+
+  return;
+
+cleanup:
+  *buf = '\0';
+}
+
+void mg_conn_addr_to_str(struct mg_connection *nc, char *buf, size_t len,
+                         int flags) {
+  union socket_address sa;
+  memset(&sa, 0, sizeof(sa));
+  mg_if_get_conn_addr(nc, flags & MG_SOCK_STRINGIFY_REMOTE, &sa);
+  mg_sock_addr_to_str(&sa, buf, len, flags);
+}
+
+#if MG_ENABLE_HEXDUMP
+static int mg_hexdump_n(const void *buf, int len, char *dst, int dst_len,
+                        int offset) {
+  const unsigned char *p = (const unsigned char *) buf;
+  char ascii[17] = "";
+  int i, idx, n = 0;
+
+  for (i = 0; i < len; i++) {
+    idx = i % 16;
+    if (idx == 0) {
+      if (i > 0) n += snprintf(dst + n, MAX(dst_len - n, 0), "  %s\n", ascii);
+      n += snprintf(dst + n, MAX(dst_len - n, 0), "%04x ", i + offset);
+    }
+    if (dst_len - n < 0) {
+      return n;
+    }
+    n += snprintf(dst + n, MAX(dst_len - n, 0), " %02x", p[i]);
+    ascii[idx] = p[i] < 0x20 || p[i] > 0x7e ? '.' : p[i];
+    ascii[idx + 1] = '\0';
+  }
+
+  while (i++ % 16) n += snprintf(dst + n, MAX(dst_len - n, 0), "%s", "   ");
+  n += snprintf(dst + n, MAX(dst_len - n, 0), "  %s\n", ascii);
+
+  return n;
+}
+
+int mg_hexdump(const void *buf, int len, char *dst, int dst_len) {
+  return mg_hexdump_n(buf, len, dst, dst_len, 0);
+}
+
+void mg_hexdumpf(FILE *fp, const void *buf, int len) {
+  char tmp[80];
+  int offset = 0, n;
+  while (len > 0) {
+    n = (len < 16 ? len : 16);
+    mg_hexdump_n(((const char *) buf) + offset, n, tmp, sizeof(tmp), offset);
+    fputs(tmp, fp);
+    offset += n;
+    len -= n;
+  }
+}
+
+void mg_hexdump_connection(struct mg_connection *nc, const char *path,
+                           const void *buf, int num_bytes, int ev) {
+  FILE *fp = NULL;
+  char *hexbuf, src[60], dst[60];
+  int buf_size = num_bytes * 5 + 100;
+
+  if (strcmp(path, "-") == 0) {
+    fp = stdout;
+  } else if (strcmp(path, "--") == 0) {
+    fp = stderr;
+#if MG_ENABLE_FILESYSTEM
+  } else {
+    fp = mg_fopen(path, "a");
+#endif
+  }
+  if (fp == NULL) return;
+
+  mg_conn_addr_to_str(nc, src, sizeof(src),
+                      MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
+  mg_conn_addr_to_str(nc, dst, sizeof(dst), MG_SOCK_STRINGIFY_IP |
+                                                MG_SOCK_STRINGIFY_PORT |
+                                                MG_SOCK_STRINGIFY_REMOTE);
+  fprintf(
+      fp, "%lu %p %s %s %s %d\n", (unsigned long) mg_time(), (void *) nc, src,
+      ev == MG_EV_RECV ? "<-" : ev == MG_EV_SEND
+                                    ? "->"
+                                    : ev == MG_EV_ACCEPT
+                                          ? "<A"
+                                          : ev == MG_EV_CONNECT ? "C>" : "XX",
+      dst, num_bytes);
+  if (num_bytes > 0 && (hexbuf = (char *) MG_MALLOC(buf_size)) != NULL) {
+    mg_hexdump(buf, num_bytes, hexbuf, buf_size);
+    fprintf(fp, "%s", hexbuf);
+    MG_FREE(hexbuf);
+  }
+  if (fp != stdin && fp != stdout) fclose(fp);
+}
+#endif
+
+int mg_is_big_endian(void) {
+  static const int n = 1;
+  /* TODO(mkm) use compiletime check with 4-byte char literal */
+  return ((char *) &n)[0] == 0;
+}
+
+const char *mg_next_comma_list_entry(const char *list, struct mg_str *val,
+                                     struct mg_str *eq_val) {
+  if (list == NULL || *list == '\0') {
+    /* End of the list */
+    list = NULL;
+  } else {
+    val->p = list;
+    if ((list = strchr(val->p, ',')) != NULL) {
+      /* Comma found. Store length and shift the list ptr */
+      val->len = list - val->p;
+      list++;
+    } else {
+      /* This value is the last one */
+      list = val->p + strlen(val->p);
+      val->len = list - val->p;
+    }
+
+    if (eq_val != NULL) {
+      /* Value has form "x=y", adjust pointers and lengths */
+      /* so that val points to "x", and eq_val points to "y". */
+      eq_val->len = 0;
+      eq_val->p = (const char *) memchr(val->p, '=', val->len);
+      if (eq_val->p != NULL) {
+        eq_val->p++; /* Skip over '=' character */
+        eq_val->len = val->p + val->len - eq_val->p;
+        val->len = (eq_val->p - val->p) - 1;
+      }
+    }
+  }
+
+  return list;
+}
+
+int mg_match_prefix_n(const struct mg_str pattern, const struct mg_str str) {
+  const char *or_str;
+  size_t len, i = 0, j = 0;
+  int res;
+
+  if ((or_str = (const char *) memchr(pattern.p, '|', pattern.len)) != NULL) {
+    struct mg_str pstr = {pattern.p, (size_t)(or_str - pattern.p)};
+    res = mg_match_prefix_n(pstr, str);
+    if (res > 0) return res;
+    pstr.p = or_str + 1;
+    pstr.len = (pattern.p + pattern.len) - (or_str + 1);
+    return mg_match_prefix_n(pstr, str);
+  }
+
+  for (; i < pattern.len; i++, j++) {
+    if (pattern.p[i] == '?' && j != str.len) {
+      continue;
+    } else if (pattern.p[i] == '$') {
+      return j == str.len ? (int) j : -1;
+    } else if (pattern.p[i] == '*') {
+      i++;
+      if (pattern.p[i] == '*') {
+        i++;
+        len = str.len - j;
+      } else {
+        len = 0;
+        while (j + len != str.len && str.p[j + len] != '/') {
+          len++;
+        }
+      }
+      if (i == pattern.len) {
+        return j + len;
+      }
+      do {
+        const struct mg_str pstr = {pattern.p + i, pattern.len - i};
+        const struct mg_str sstr = {str.p + j + len, str.len - j - len};
+        res = mg_match_prefix_n(pstr, sstr);
+      } while (res == -1 && len-- > 0);
+      return res == -1 ? -1 : (int) (j + res + len);
+    } else if (lowercase(&pattern.p[i]) != lowercase(&str.p[j])) {
+      return -1;
+    }
+  }
+  return j;
+}
+
+int mg_match_prefix(const char *pattern, int pattern_len, const char *str) {
+  const struct mg_str pstr = {pattern, (size_t) pattern_len};
+  return mg_match_prefix_n(pstr, mg_mk_str(str));
+}
+
+DO_NOT_WARN_UNUSED MG_INTERNAL int mg_get_errno(void) {
+#ifndef WINCE
+  return errno;
+#else
+  /* TODO(alashkin): translate error codes? */
+  return GetLastError();
+#endif
+}
+
+void mg_mbuf_append_base64_putc(char ch, void *user_data) {
+  struct mbuf *mbuf = (struct mbuf *) user_data;
+  mbuf_append(mbuf, &ch, sizeof(ch));
+}
+
+void mg_mbuf_append_base64(struct mbuf *mbuf, const void *data, size_t len) {
+  struct cs_base64_ctx ctx;
+  cs_base64_init(&ctx, mg_mbuf_append_base64_putc, mbuf);
+  cs_base64_update(&ctx, (const char *) data, len);
+  cs_base64_finish(&ctx);
+}
+
+void mg_basic_auth_header(const char *user, const char *pass,
+                          struct mbuf *buf) {
+  const char *header_prefix = "Authorization: Basic ";
+  const char *header_suffix = "\r\n";
+
+  struct cs_base64_ctx ctx;
+  cs_base64_init(&ctx, mg_mbuf_append_base64_putc, buf);
+
+  mbuf_append(buf, header_prefix, strlen(header_prefix));
+
+  cs_base64_update(&ctx, user, strlen(user));
+  if (pass != NULL) {
+    cs_base64_update(&ctx, ":", 1);
+    cs_base64_update(&ctx, pass, strlen(pass));
+  }
+  cs_base64_finish(&ctx);
+  mbuf_append(buf, header_suffix, strlen(header_suffix));
+}
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/mqtt.c"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_MQTT
+
+#include <string.h>
+
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/mqtt.h" */
+
+static uint16_t getu16(const char *p) {
+  const uint8_t *up = (const uint8_t *) p;
+  return (up[0] << 8) + up[1];
+}
+
+static const char *scanto(const char *p, struct mg_str *s) {
+  s->len = getu16(p);
+  s->p = p + 2;
+  return s->p + s->len;
+}
+
+MG_INTERNAL int parse_mqtt(struct mbuf *io, struct mg_mqtt_message *mm) {
+  uint8_t header;
+  size_t len = 0;
+  int cmd;
+  const char *p = &io->buf[1], *end;
+
+  if (io->len < 2) return -1;
+  header = io->buf[0];
+  cmd = header >> 4;
+
+  /* decode mqtt variable length */
+  do {
+    len += (*p & 127) << 7 * (p - &io->buf[1]);
+  } while ((*p++ & 128) != 0 && ((size_t)(p - io->buf) <= io->len));
+
+  end = p + len;
+  if (end > io->buf + io->len + 1) {
+    return -1;
+  }
+
+  mm->cmd = cmd;
+  mm->qos = MG_MQTT_GET_QOS(header);
+
+  switch (cmd) {
+    case MG_MQTT_CMD_CONNECT: {
+      p = scanto(p, &mm->protocol_name);
+      mm->protocol_version = *(uint8_t *) p++;
+      mm->connect_flags = *(uint8_t *) p++;
+      mm->keep_alive_timer = getu16(p);
+      p += 2;
+      if (p < end) p = scanto(p, &mm->client_id);
+      if (p < end && (mm->connect_flags & MG_MQTT_HAS_WILL))
+        p = scanto(p, &mm->will_topic);
+      if (p < end && (mm->connect_flags & MG_MQTT_HAS_WILL))
+        p = scanto(p, &mm->will_message);
+      if (p < end && (mm->connect_flags & MG_MQTT_HAS_USER_NAME))
+        p = scanto(p, &mm->user_name);
+      if (p < end && (mm->connect_flags & MG_MQTT_HAS_PASSWORD))
+        p = scanto(p, &mm->password);
+
+      LOG(LL_DEBUG,
+          ("%d %2x %d proto [%.*s] client_id [%.*s] will_topic [%.*s] "
+           "will_msg [%.*s] user_name [%.*s] password [%.*s]",
+           len, (int) mm->connect_flags, (int) mm->keep_alive_timer,
+           (int) mm->protocol_name.len, mm->protocol_name.p,
+           (int) mm->client_id.len, mm->client_id.p, (int) mm->will_topic.len,
+           mm->will_topic.p, (int) mm->will_message.len, mm->will_message.p,
+           (int) mm->user_name.len, mm->user_name.p, (int) mm->password.len,
+           mm->password.p));
+      break;
+    }
+    case MG_MQTT_CMD_CONNACK:
+      mm->connack_ret_code = p[1];
+      break;
+    case MG_MQTT_CMD_PUBACK:
+    case MG_MQTT_CMD_PUBREC:
+    case MG_MQTT_CMD_PUBREL:
+    case MG_MQTT_CMD_PUBCOMP:
+    case MG_MQTT_CMD_SUBACK:
+      mm->message_id = getu16(p);
+      break;
+    case MG_MQTT_CMD_PUBLISH: {
+      if (MG_MQTT_GET_QOS(header) > 0) {
+        mm->message_id = getu16(p);
+        p += 2;
+      }
+      p = scanto(p, &mm->topic);
+
+      mm->payload.p = p;
+      mm->payload.len = end - p;
+      break;
+    }
+    case MG_MQTT_CMD_SUBSCRIBE:
+      mm->message_id = getu16(p);
+      p += 2;
+      /*
+       * topic expressions are left in the payload and can be parsed with
+       * `mg_mqtt_next_subscribe_topic`
+       */
+      mm->payload.p = p;
+      mm->payload.len = end - p;
+      break;
+    default:
+      /* Unhandled command */
+      break;
+  }
+
+  return end - io->buf;
+}
+
+static void mqtt_handler(struct mg_connection *nc, int ev, void *ev_data) {
+  int len;
+  struct mbuf *io = &nc->recv_mbuf;
+  struct mg_mqtt_message mm;
+  memset(&mm, 0, sizeof(mm));
+
+  nc->handler(nc, ev, ev_data);
+
+  switch (ev) {
+    case MG_EV_RECV:
+      len = parse_mqtt(io, &mm);
+      if (len == -1) break; /* not fully buffered */
+      nc->handler(nc, MG_MQTT_EVENT_BASE + mm.cmd, &mm);
+      mbuf_remove(io, len);
+      break;
+  }
+}
+
+static void mg_mqtt_proto_data_destructor(void *proto_data) {
+  MG_FREE(proto_data);
+}
+
+void mg_set_protocol_mqtt(struct mg_connection *nc) {
+  nc->proto_handler = mqtt_handler;
+  nc->proto_data = MG_CALLOC(1, sizeof(struct mg_mqtt_proto_data));
+  nc->proto_data_destructor = mg_mqtt_proto_data_destructor;
+}
+
+void mg_send_mqtt_handshake(struct mg_connection *nc, const char *client_id) {
+  static struct mg_send_mqtt_handshake_opts opts;
+  mg_send_mqtt_handshake_opt(nc, client_id, opts);
+}
+
+void mg_send_mqtt_handshake_opt(struct mg_connection *nc, const char *client_id,
+                                struct mg_send_mqtt_handshake_opts opts) {
+  uint8_t header = MG_MQTT_CMD_CONNECT << 4;
+  uint8_t rem_len;
+  uint16_t keep_alive;
+  uint16_t len;
+  struct mg_mqtt_proto_data *pd = (struct mg_mqtt_proto_data *) nc->proto_data;
+
+  /*
+   * 9: version_header(len, magic_string, version_number), 1: flags, 2:
+   * keep-alive timer,
+   * 2: client_identifier_len, n: client_id
+   */
+  rem_len = 9 + 1 + 2 + 2 + (uint8_t) strlen(client_id);
+
+  if (opts.user_name != NULL) {
+    opts.flags |= MG_MQTT_HAS_USER_NAME;
+    rem_len += (uint8_t) strlen(opts.user_name) + 2;
+  }
+  if (opts.password != NULL) {
+    opts.flags |= MG_MQTT_HAS_PASSWORD;
+    rem_len += (uint8_t) strlen(opts.password) + 2;
+  }
+  if (opts.will_topic != NULL && opts.will_message != NULL) {
+    opts.flags |= MG_MQTT_HAS_WILL;
+    rem_len += (uint8_t) strlen(opts.will_topic) + 2;
+    rem_len += (uint8_t) strlen(opts.will_message) + 2;
+  }
+
+  mg_send(nc, &header, 1);
+  mg_send(nc, &rem_len, 1);
+  mg_send(nc, "\00\06MQIsdp\03", 9);
+  mg_send(nc, &opts.flags, 1);
+
+  if (opts.keep_alive == 0) {
+    opts.keep_alive = 60;
+  }
+
+  keep_alive = htons(opts.keep_alive);
+  mg_send(nc, &keep_alive, 2);
+
+  len = htons((uint16_t) strlen(client_id));
+  mg_send(nc, &len, 2);
+  mg_send(nc, client_id, strlen(client_id));
+
+  if (opts.flags & MG_MQTT_HAS_WILL) {
+    len = htons((uint16_t) strlen(opts.will_topic));
+    mg_send(nc, &len, 2);
+    mg_send(nc, opts.will_topic, strlen(opts.will_topic));
+
+    len = htons((uint16_t) strlen(opts.will_message));
+    mg_send(nc, &len, 2);
+    mg_send(nc, opts.will_message, strlen(opts.will_message));
+  }
+
+  if (opts.flags & MG_MQTT_HAS_USER_NAME) {
+    len = htons((uint16_t) strlen(opts.user_name));
+    mg_send(nc, &len, 2);
+    mg_send(nc, opts.user_name, strlen(opts.user_name));
+  }
+  if (opts.flags & MG_MQTT_HAS_PASSWORD) {
+    len = htons((uint16_t) strlen(opts.password));
+    mg_send(nc, &len, 2);
+    mg_send(nc, opts.password, strlen(opts.password));
+  }
+
+  if (pd != NULL) {
+    pd->keep_alive = opts.keep_alive;
+  }
+}
+
+static void mg_mqtt_prepend_header(struct mg_connection *nc, uint8_t cmd,
+                                   uint8_t flags, size_t len) {
+  size_t off = nc->send_mbuf.len - len;
+  uint8_t header = cmd << 4 | (uint8_t) flags;
+
+  uint8_t buf[1 + sizeof(size_t)];
+  uint8_t *vlen = &buf[1];
+
+  assert(nc->send_mbuf.len >= len);
+
+  buf[0] = header;
+
+  /* mqtt variable length encoding */
+  do {
+    *vlen = len % 0x80;
+    len /= 0x80;
+    if (len > 0) *vlen |= 0x80;
+    vlen++;
+  } while (len > 0);
+
+  mbuf_insert(&nc->send_mbuf, off, buf, vlen - buf);
+}
+
+void mg_mqtt_publish(struct mg_connection *nc, const char *topic,
+                     uint16_t message_id, int flags, const void *data,
+                     size_t len) {
+  size_t old_len = nc->send_mbuf.len;
+
+  uint16_t topic_len = htons((uint16_t) strlen(topic));
+  uint16_t message_id_net = htons(message_id);
+
+  mg_send(nc, &topic_len, 2);
+  mg_send(nc, topic, strlen(topic));
+  if (MG_MQTT_GET_QOS(flags) > 0) {
+    mg_send(nc, &message_id_net, 2);
+  }
+  mg_send(nc, data, len);
+
+  mg_mqtt_prepend_header(nc, MG_MQTT_CMD_PUBLISH, flags,
+                         nc->send_mbuf.len - old_len);
+}
+
+void mg_mqtt_subscribe(struct mg_connection *nc,
+                       const struct mg_mqtt_topic_expression *topics,
+                       size_t topics_len, uint16_t message_id) {
+  size_t old_len = nc->send_mbuf.len;
+
+  uint16_t message_id_n = htons(message_id);
+  size_t i;
+
+  mg_send(nc, (char *) &message_id_n, 2);
+  for (i = 0; i < topics_len; i++) {
+    uint16_t topic_len_n = htons((uint16_t) strlen(topics[i].topic));
+    mg_send(nc, &topic_len_n, 2);
+    mg_send(nc, topics[i].topic, strlen(topics[i].topic));
+    mg_send(nc, &topics[i].qos, 1);
+  }
+
+  mg_mqtt_prepend_header(nc, MG_MQTT_CMD_SUBSCRIBE, MG_MQTT_QOS(1),
+                         nc->send_mbuf.len - old_len);
+}
+
+int mg_mqtt_next_subscribe_topic(struct mg_mqtt_message *msg,
+                                 struct mg_str *topic, uint8_t *qos, int pos) {
+  unsigned char *buf = (unsigned char *) msg->payload.p + pos;
+
+  if ((size_t) pos >= msg->payload.len) {
+    return -1;
+  }
+
+  topic->len = buf[0] << 8 | buf[1];
+  topic->p = (char *) buf + 2;
+  *qos = buf[2 + topic->len];
+  return pos + 2 + topic->len + 1;
+}
+
+void mg_mqtt_unsubscribe(struct mg_connection *nc, char **topics,
+                         size_t topics_len, uint16_t message_id) {
+  size_t old_len = nc->send_mbuf.len;
+
+  uint16_t message_id_n = htons(message_id);
+  size_t i;
+
+  mg_send(nc, (char *) &message_id_n, 2);
+  for (i = 0; i < topics_len; i++) {
+    uint16_t topic_len_n = htons((uint16_t) strlen(topics[i]));
+    mg_send(nc, &topic_len_n, 2);
+    mg_send(nc, topics[i], strlen(topics[i]));
+  }
+
+  mg_mqtt_prepend_header(nc, MG_MQTT_CMD_UNSUBSCRIBE, MG_MQTT_QOS(1),
+                         nc->send_mbuf.len - old_len);
+}
+
+void mg_mqtt_connack(struct mg_connection *nc, uint8_t return_code) {
+  uint8_t unused = 0;
+  mg_send(nc, &unused, 1);
+  mg_send(nc, &return_code, 1);
+  mg_mqtt_prepend_header(nc, MG_MQTT_CMD_CONNACK, 0, 2);
+}
+
+/*
+ * Sends a command which contains only a `message_id` and a QoS level of 1.
+ *
+ * Helper function.
+ */
+static void mg_send_mqtt_short_command(struct mg_connection *nc, uint8_t cmd,
+                                       uint16_t message_id) {
+  uint16_t message_id_net = htons(message_id);
+  mg_send(nc, &message_id_net, 2);
+  mg_mqtt_prepend_header(nc, cmd, MG_MQTT_QOS(1), 2);
+}
+
+void mg_mqtt_puback(struct mg_connection *nc, uint16_t message_id) {
+  mg_send_mqtt_short_command(nc, MG_MQTT_CMD_PUBACK, message_id);
+}
+
+void mg_mqtt_pubrec(struct mg_connection *nc, uint16_t message_id) {
+  mg_send_mqtt_short_command(nc, MG_MQTT_CMD_PUBREC, message_id);
+}
+
+void mg_mqtt_pubrel(struct mg_connection *nc, uint16_t message_id) {
+  mg_send_mqtt_short_command(nc, MG_MQTT_CMD_PUBREL, message_id);
+}
+
+void mg_mqtt_pubcomp(struct mg_connection *nc, uint16_t message_id) {
+  mg_send_mqtt_short_command(nc, MG_MQTT_CMD_PUBCOMP, message_id);
+}
+
+void mg_mqtt_suback(struct mg_connection *nc, uint8_t *qoss, size_t qoss_len,
+                    uint16_t message_id) {
+  size_t i;
+  uint16_t message_id_net = htons(message_id);
+  mg_send(nc, &message_id_net, 2);
+  for (i = 0; i < qoss_len; i++) {
+    mg_send(nc, &qoss[i], 1);
+  }
+  mg_mqtt_prepend_header(nc, MG_MQTT_CMD_SUBACK, MG_MQTT_QOS(1), 2 + qoss_len);
+}
+
+void mg_mqtt_unsuback(struct mg_connection *nc, uint16_t message_id) {
+  mg_send_mqtt_short_command(nc, MG_MQTT_CMD_UNSUBACK, message_id);
+}
+
+void mg_mqtt_ping(struct mg_connection *nc) {
+  mg_mqtt_prepend_header(nc, MG_MQTT_CMD_PINGREQ, 0, 0);
+}
+
+void mg_mqtt_pong(struct mg_connection *nc) {
+  mg_mqtt_prepend_header(nc, MG_MQTT_CMD_PINGRESP, 0, 0);
+}
+
+void mg_mqtt_disconnect(struct mg_connection *nc) {
+  mg_mqtt_prepend_header(nc, MG_MQTT_CMD_DISCONNECT, 0, 0);
+}
+
+#endif /* MG_ENABLE_MQTT */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/mqtt_server.c"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/mqtt-server.h" */
+
+#if MG_ENABLE_MQTT_BROKER
+
+static void mg_mqtt_session_init(struct mg_mqtt_broker *brk,
+                                 struct mg_mqtt_session *s,
+                                 struct mg_connection *nc) {
+  s->brk = brk;
+  s->subscriptions = NULL;
+  s->num_subscriptions = 0;
+  s->nc = nc;
+}
+
+static void mg_mqtt_add_session(struct mg_mqtt_session *s) {
+  LIST_INSERT_HEAD(&s->brk->sessions, s, link);
+}
+
+static void mg_mqtt_remove_session(struct mg_mqtt_session *s) {
+  LIST_REMOVE(s, link);
+}
+
+static void mg_mqtt_destroy_session(struct mg_mqtt_session *s) {
+  size_t i;
+  for (i = 0; i < s->num_subscriptions; i++) {
+    MG_FREE((void *) s->subscriptions[i].topic);
+  }
+  MG_FREE(s->subscriptions);
+  MG_FREE(s);
+}
+
+static void mg_mqtt_close_session(struct mg_mqtt_session *s) {
+  mg_mqtt_remove_session(s);
+  mg_mqtt_destroy_session(s);
+}
+
+void mg_mqtt_broker_init(struct mg_mqtt_broker *brk, void *user_data) {
+  LIST_INIT(&brk->sessions);
+  brk->user_data = user_data;
+}
+
+static void mg_mqtt_broker_handle_connect(struct mg_mqtt_broker *brk,
+                                          struct mg_connection *nc) {
+  struct mg_mqtt_session *s = (struct mg_mqtt_session *) MG_CALLOC(1, sizeof *s);
+  if (s == NULL) {
+    /* LCOV_EXCL_START */
+    mg_mqtt_connack(nc, MG_EV_MQTT_CONNACK_SERVER_UNAVAILABLE);
+    return;
+    /* LCOV_EXCL_STOP */
+  }
+
+  /* TODO(mkm): check header (magic and version) */
+
+  mg_mqtt_session_init(brk, s, nc);
+  s->user_data = nc->user_data;
+  nc->user_data = s;
+  mg_mqtt_add_session(s);
+
+  mg_mqtt_connack(nc, MG_EV_MQTT_CONNACK_ACCEPTED);
+}
+
+static void mg_mqtt_broker_handle_subscribe(struct mg_connection *nc,
+                                            struct mg_mqtt_message *msg) {
+  struct mg_mqtt_session *ss = (struct mg_mqtt_session *) nc->user_data;
+  uint8_t qoss[512];
+  size_t qoss_len = 0;
+  struct mg_str topic;
+  uint8_t qos;
+  int pos;
+  struct mg_mqtt_topic_expression *te;
+
+  for (pos = 0;
+       (pos = mg_mqtt_next_subscribe_topic(msg, &topic, &qos, pos)) != -1;) {
+    qoss[qoss_len++] = qos;
+  }
+
+  ss->subscriptions = (struct mg_mqtt_topic_expression *) MG_REALLOC(
+      ss->subscriptions, sizeof(*ss->subscriptions) * qoss_len);
+  for (pos = 0;
+       (pos = mg_mqtt_next_subscribe_topic(msg, &topic, &qos, pos)) != -1;
+       ss->num_subscriptions++) {
+    te = &ss->subscriptions[ss->num_subscriptions];
+    te->topic = (char *) MG_MALLOC(topic.len + 1);
+    te->qos = qos;
+    strncpy((char *) te->topic, topic.p, topic.len + 1);
+  }
+
+  mg_mqtt_suback(nc, qoss, qoss_len, msg->message_id);
+}
+
+/*
+ * Matches a topic against a topic expression
+ *
+ * See http://goo.gl/iWk21X
+ *
+ * Returns 1 if it matches; 0 otherwise.
+ */
+static int mg_mqtt_match_topic_expression(const char *exp,
+                                          const struct mg_str *topic) {
+  /* TODO(mkm): implement real matching */
+  size_t len = strlen(exp);
+  if (strchr(exp, '#')) {
+    len -= 2;
+    if (topic->len < len) {
+      len = topic->len;
+    }
+  }
+  return strncmp(topic->p, exp, len) == 0;
+}
+
+static void mg_mqtt_broker_handle_publish(struct mg_mqtt_broker *brk,
+                                          struct mg_mqtt_message *msg) {
+  struct mg_mqtt_session *s;
+  size_t i;
+
+  for (s = mg_mqtt_next(brk, NULL); s != NULL; s = mg_mqtt_next(brk, s)) {
+    for (i = 0; i < s->num_subscriptions; i++) {
+      if (mg_mqtt_match_topic_expression(s->subscriptions[i].topic,
+                                         &msg->topic)) {
+        char buf[100], *p = buf;
+        mg_asprintf(&p, sizeof(buf), "%.*s", (int) msg->topic.len,
+                    msg->topic.p);
+        if (p == NULL) {
+          return;
+        }
+        mg_mqtt_publish(s->nc, p, 0, 0, msg->payload.p, msg->payload.len);
+        if (p != buf) {
+          MG_FREE(p);
+        }
+        break;
+      }
+    }
+  }
+}
+
+void mg_mqtt_broker(struct mg_connection *nc, int ev, void *data) {
+  struct mg_mqtt_message *msg = (struct mg_mqtt_message *) data;
+  struct mg_mqtt_broker *brk;
+
+  if (nc->listener) {
+    brk = (struct mg_mqtt_broker *) nc->listener->user_data;
+  } else {
+    brk = (struct mg_mqtt_broker *) nc->user_data;
+  }
+
+  switch (ev) {
+    case MG_EV_ACCEPT:
+      mg_set_protocol_mqtt(nc);
+      nc->user_data = NULL; /* Clear up the inherited pointer to broker */
+      break;
+    case MG_EV_MQTT_CONNECT:
+      mg_mqtt_broker_handle_connect(brk, nc);
+      break;
+    case MG_EV_MQTT_SUBSCRIBE:
+      mg_mqtt_broker_handle_subscribe(nc, msg);
+      break;
+    case MG_EV_MQTT_PUBLISH:
+      mg_mqtt_broker_handle_publish(brk, msg);
+      break;
+    case MG_EV_CLOSE:
+      if (nc->listener && nc->user_data != NULL) {
+        mg_mqtt_close_session((struct mg_mqtt_session *) nc->user_data);
+      }
+      break;
+  }
+}
+
+struct mg_mqtt_session *mg_mqtt_next(struct mg_mqtt_broker *brk,
+                                     struct mg_mqtt_session *s) {
+  return s == NULL ? LIST_FIRST(&brk->sessions) : LIST_NEXT(s, link);
+}
+
+#endif /* MG_ENABLE_MQTT_BROKER */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/dns.c"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_DNS
+
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/dns.h" */
+
+static int mg_dns_tid = 0xa0;
+
+struct mg_dns_header {
+  uint16_t transaction_id;
+  uint16_t flags;
+  uint16_t num_questions;
+  uint16_t num_answers;
+  uint16_t num_authority_prs;
+  uint16_t num_other_prs;
+};
+
+struct mg_dns_resource_record *mg_dns_next_record(
+    struct mg_dns_message *msg, int query,
+    struct mg_dns_resource_record *prev) {
+  struct mg_dns_resource_record *rr;
+
+  for (rr = (prev == NULL ? msg->answers : prev + 1);
+       rr - msg->answers < msg->num_answers; rr++) {
+    if (rr->rtype == query) {
+      return rr;
+    }
+  }
+  return NULL;
+}
+
+int mg_dns_parse_record_data(struct mg_dns_message *msg,
+                             struct mg_dns_resource_record *rr, void *data,
+                             size_t data_len) {
+  switch (rr->rtype) {
+    case MG_DNS_A_RECORD:
+      if (data_len < sizeof(struct in_addr)) {
+        return -1;
+      }
+      if (rr->rdata.p + data_len > msg->pkt.p + msg->pkt.len) {
+        return -1;
+      }
+      memcpy(data, rr->rdata.p, data_len);
+      return 0;
+#if MG_ENABLE_IPV6
+    case MG_DNS_AAAA_RECORD:
+      if (data_len < sizeof(struct in6_addr)) {
+        return -1; /* LCOV_EXCL_LINE */
+      }
+      memcpy(data, rr->rdata.p, data_len);
+      return 0;
+#endif
+    case MG_DNS_CNAME_RECORD:
+      mg_dns_uncompress_name(msg, &rr->rdata, (char *) data, data_len);
+      return 0;
+  }
+
+  return -1;
+}
+
+int mg_dns_insert_header(struct mbuf *io, size_t pos,
+                         struct mg_dns_message *msg) {
+  struct mg_dns_header header;
+
+  memset(&header, 0, sizeof(header));
+  header.transaction_id = msg->transaction_id;
+  header.flags = htons(msg->flags);
+  header.num_questions = htons(msg->num_questions);
+  header.num_answers = htons(msg->num_answers);
+
+  return mbuf_insert(io, pos, &header, sizeof(header));
+}
+
+int mg_dns_copy_questions(struct mbuf *io, struct mg_dns_message *msg) {
+  unsigned char *begin, *end;
+  struct mg_dns_resource_record *last_q;
+  if (msg->num_questions <= 0) return 0;
+  begin = (unsigned char *) msg->pkt.p + sizeof(struct mg_dns_header);
+  last_q = &msg->questions[msg->num_questions - 1];
+  end = (unsigned char *) last_q->name.p + last_q->name.len + 4;
+  return mbuf_append(io, begin, end - begin);
+}
+
+int mg_dns_encode_name(struct mbuf *io, const char *name, size_t len) {
+  const char *s;
+  unsigned char n;
+  size_t pos = io->len;
+
+  do {
+    if ((s = strchr(name, '.')) == NULL) {
+      s = name + len;
+    }
+
+    if (s - name > 127) {
+      return -1; /* TODO(mkm) cover */
+    }
+    n = s - name;           /* chunk length */
+    mbuf_append(io, &n, 1); /* send length */
+    mbuf_append(io, name, n);
+
+    if (*s == '.') {
+      n++;
+    }
+
+    name += n;
+    len -= n;
+  } while (*s != '\0');
+  mbuf_append(io, "\0", 1); /* Mark end of host name */
+
+  return io->len - pos;
+}
+
+int mg_dns_encode_record(struct mbuf *io, struct mg_dns_resource_record *rr,
+                         const char *name, size_t nlen, const void *rdata,
+                         size_t rlen) {
+  size_t pos = io->len;
+  uint16_t u16;
+  uint32_t u32;
+
+  if (rr->kind == MG_DNS_INVALID_RECORD) {
+    return -1; /* LCOV_EXCL_LINE */
+  }
+
+  if (mg_dns_encode_name(io, name, nlen) == -1) {
+    return -1;
+  }
+
+  u16 = htons(rr->rtype);
+  mbuf_append(io, &u16, 2);
+  u16 = htons(rr->rclass);
+  mbuf_append(io, &u16, 2);
+
+  if (rr->kind == MG_DNS_ANSWER) {
+    u32 = htonl(rr->ttl);
+    mbuf_append(io, &u32, 4);
+
+    if (rr->rtype == MG_DNS_CNAME_RECORD) {
+      int clen;
+      /* fill size after encoding */
+      size_t off = io->len;
+      mbuf_append(io, &u16, 2);
+      if ((clen = mg_dns_encode_name(io, (const char *) rdata, rlen)) == -1) {
+        return -1;
+      }
+      u16 = clen;
+      io->buf[off] = u16 >> 8;
+      io->buf[off + 1] = u16 & 0xff;
+    } else {
+      u16 = htons((uint16_t) rlen);
+      mbuf_append(io, &u16, 2);
+      mbuf_append(io, rdata, rlen);
+    }
+  }
+
+  return io->len - pos;
+}
+
+void mg_send_dns_query(struct mg_connection *nc, const char *name,
+                       int query_type) {
+  struct mg_dns_message *msg =
+      (struct mg_dns_message *) MG_CALLOC(1, sizeof(*msg));
+  struct mbuf pkt;
+  struct mg_dns_resource_record *rr = &msg->questions[0];
+
+  DBG(("%s %d", name, query_type));
+
+  mbuf_init(&pkt, 64 /* Start small, it'll grow as needed. */);
+
+  msg->transaction_id = ++mg_dns_tid;
+  msg->flags = 0x100;
+  msg->num_questions = 1;
+
+  mg_dns_insert_header(&pkt, 0, msg);
+
+  rr->rtype = query_type;
+  rr->rclass = 1; /* Class: inet */
+  rr->kind = MG_DNS_QUESTION;
+
+  if (mg_dns_encode_record(&pkt, rr, name, strlen(name), NULL, 0) == -1) {
+    /* TODO(mkm): return an error code */
+    goto cleanup; /* LCOV_EXCL_LINE */
+  }
+
+  /* TCP DNS requires messages to be prefixed with len */
+  if (!(nc->flags & MG_F_UDP)) {
+    uint16_t len = htons((uint16_t) pkt.len);
+    mbuf_insert(&pkt, 0, &len, 2);
+  }
+
+  mg_send(nc, pkt.buf, pkt.len);
+  mbuf_free(&pkt);
+
+cleanup:
+  MG_FREE(msg);
+}
+
+static unsigned char *mg_parse_dns_resource_record(
+    unsigned char *data, unsigned char *end, struct mg_dns_resource_record *rr,
+    int reply) {
+  unsigned char *name = data;
+  int chunk_len, data_len;
+
+  while (data < end && (chunk_len = *data)) {
+    if (((unsigned char *) data)[0] & 0xc0) {
+      data += 1;
+      break;
+    }
+    data += chunk_len + 1;
+  }
+
+  if (data > end - 5) {
+    return NULL;
+  }
+
+  rr->name.p = (char *) name;
+  rr->name.len = data - name + 1;
+  data++;
+
+  rr->rtype = data[0] << 8 | data[1];
+  data += 2;
+
+  rr->rclass = data[0] << 8 | data[1];
+  data += 2;
+
+  rr->kind = reply ? MG_DNS_ANSWER : MG_DNS_QUESTION;
+  if (reply) {
+    if (data >= end - 6) {
+      return NULL;
+    }
+
+    rr->ttl = (uint32_t) data[0] << 24 | (uint32_t) data[1] << 16 |
+              data[2] << 8 | data[3];
+    data += 4;
+
+    data_len = *data << 8 | *(data + 1);
+    data += 2;
+
+    rr->rdata.p = (char *) data;
+    rr->rdata.len = data_len;
+    data += data_len;
+  }
+  return data;
+}
+
+int mg_parse_dns(const char *buf, int len, struct mg_dns_message *msg) {
+  struct mg_dns_header *header = (struct mg_dns_header *) buf;
+  unsigned char *data = (unsigned char *) buf + sizeof(*header);
+  unsigned char *end = (unsigned char *) buf + len;
+  int i;
+
+  memset(msg, 0, sizeof(*msg));
+  msg->pkt.p = buf;
+  msg->pkt.len = len;
+
+  if (len < (int) sizeof(*header)) return -1;
+
+  msg->transaction_id = header->transaction_id;
+  msg->flags = ntohs(header->flags);
+  msg->num_questions = ntohs(header->num_questions);
+  if (msg->num_questions > (int) ARRAY_SIZE(msg->questions)) {
+    msg->num_questions = (int) ARRAY_SIZE(msg->questions);
+  }
+  msg->num_answers = ntohs(header->num_answers);
+  if (msg->num_answers > (int) ARRAY_SIZE(msg->answers)) {
+    msg->num_answers = (int) ARRAY_SIZE(msg->answers);
+  }
+
+  for (i = 0; i < msg->num_questions; i++) {
+    data = mg_parse_dns_resource_record(data, end, &msg->questions[i], 0);
+    if (data == NULL) return -1;
+  }
+
+  for (i = 0; i < msg->num_answers; i++) {
+    data = mg_parse_dns_resource_record(data, end, &msg->answers[i], 1);
+    if (data == NULL) return -1;
+  }
+
+  return 0;
+}
+
+size_t mg_dns_uncompress_name(struct mg_dns_message *msg, struct mg_str *name,
+                              char *dst, int dst_len) {
+  int chunk_len;
+  char *old_dst = dst;
+  const unsigned char *data = (unsigned char *) name->p;
+  const unsigned char *end = (unsigned char *) msg->pkt.p + msg->pkt.len;
+
+  if (data >= end) {
+    return 0;
+  }
+
+  while ((chunk_len = *data++)) {
+    int leeway = dst_len - (dst - old_dst);
+    if (data >= end) {
+      return 0;
+    }
+
+    if (chunk_len & 0xc0) {
+      uint16_t off = (data[-1] & (~0xc0)) << 8 | data[0];
+      if (off >= msg->pkt.len) {
+        return 0;
+      }
+      data = (unsigned char *) msg->pkt.p + off;
+      continue;
+    }
+    if (chunk_len > leeway) {
+      chunk_len = leeway;
+    }
+
+    if (data + chunk_len >= end) {
+      return 0;
+    }
+
+    memcpy(dst, data, chunk_len);
+    data += chunk_len;
+    dst += chunk_len;
+    leeway -= chunk_len;
+    if (leeway == 0) {
+      return dst - old_dst;
+    }
+    *dst++ = '.';
+  }
+
+  if (dst != old_dst) {
+    *--dst = 0;
+  }
+  return dst - old_dst;
+}
+
+static void dns_handler(struct mg_connection *nc, int ev, void *ev_data) {
+  struct mbuf *io = &nc->recv_mbuf;
+  struct mg_dns_message msg;
+
+  /* Pass low-level events to the user handler */
+  nc->handler(nc, ev, ev_data);
+
+  switch (ev) {
+    case MG_EV_RECV:
+      if (!(nc->flags & MG_F_UDP)) {
+        mbuf_remove(&nc->recv_mbuf, 2);
+      }
+      if (mg_parse_dns(nc->recv_mbuf.buf, nc->recv_mbuf.len, &msg) == -1) {
+        /* reply + recursion allowed + format error */
+        memset(&msg, 0, sizeof(msg));
+        msg.flags = 0x8081;
+        mg_dns_insert_header(io, 0, &msg);
+        if (!(nc->flags & MG_F_UDP)) {
+          uint16_t len = htons((uint16_t) io->len);
+          mbuf_insert(io, 0, &len, 2);
+        }
+        mg_send(nc, io->buf, io->len);
+      } else {
+        /* Call user handler with parsed message */
+        nc->handler(nc, MG_DNS_MESSAGE, &msg);
+      }
+      mbuf_remove(io, io->len);
+      break;
+  }
+}
+
+void mg_set_protocol_dns(struct mg_connection *nc) {
+  nc->proto_handler = dns_handler;
+}
+
+#endif /* MG_ENABLE_DNS */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/dns_server.c"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_DNS_SERVER
+
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/dns-server.h" */
+
+struct mg_dns_reply mg_dns_create_reply(struct mbuf *io,
+                                        struct mg_dns_message *msg) {
+  struct mg_dns_reply rep;
+  rep.msg = msg;
+  rep.io = io;
+  rep.start = io->len;
+
+  /* reply + recursion allowed */
+  msg->flags |= 0x8080;
+  mg_dns_copy_questions(io, msg);
+
+  msg->num_answers = 0;
+  return rep;
+}
+
+void mg_dns_send_reply(struct mg_connection *nc, struct mg_dns_reply *r) {
+  size_t sent = r->io->len - r->start;
+  mg_dns_insert_header(r->io, r->start, r->msg);
+  if (!(nc->flags & MG_F_UDP)) {
+    uint16_t len = htons((uint16_t) sent);
+    mbuf_insert(r->io, r->start, &len, 2);
+  }
+
+  if (&nc->send_mbuf != r->io) {
+    mg_send(nc, r->io->buf + r->start, r->io->len - r->start);
+    r->io->len = r->start;
+  }
+}
+
+int mg_dns_reply_record(struct mg_dns_reply *reply,
+                        struct mg_dns_resource_record *question,
+                        const char *name, int rtype, int ttl, const void *rdata,
+                        size_t rdata_len) {
+  struct mg_dns_message *msg = (struct mg_dns_message *) reply->msg;
+  char rname[512];
+  struct mg_dns_resource_record *ans = &msg->answers[msg->num_answers];
+  if (msg->num_answers >= MG_MAX_DNS_ANSWERS) {
+    return -1; /* LCOV_EXCL_LINE */
+  }
+
+  if (name == NULL) {
+    name = rname;
+    rname[511] = 0;
+    mg_dns_uncompress_name(msg, &question->name, rname, sizeof(rname) - 1);
+  }
+
+  *ans = *question;
+  ans->kind = MG_DNS_ANSWER;
+  ans->rtype = rtype;
+  ans->ttl = ttl;
+
+  if (mg_dns_encode_record(reply->io, ans, name, strlen(name), rdata,
+                           rdata_len) == -1) {
+    return -1; /* LCOV_EXCL_LINE */
+  };
+
+  msg->num_answers++;
+  return 0;
+}
+
+#endif /* MG_ENABLE_DNS_SERVER */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/resolv.c"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_ASYNC_RESOLVER
+
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/resolv.h" */
+
+#ifndef MG_DEFAULT_NAMESERVER
+#define MG_DEFAULT_NAMESERVER "8.8.8.8"
+#endif
+
+static const char *mg_default_dns_server = "udp://" MG_DEFAULT_NAMESERVER ":53";
+
+MG_INTERNAL char mg_dns_server[256];
+
+struct mg_resolve_async_request {
+  char name[1024];
+  int query;
+  mg_resolve_callback_t callback;
+  void *data;
+  time_t timeout;
+  int max_retries;
+  enum mg_resolve_err err;
+
+  /* state */
+  time_t last_time;
+  int retries;
+};
+
+/*
+ * Find what nameserver to use.
+ *
+ * Return 0 if OK, -1 if error
+ */
+static int mg_get_ip_address_of_nameserver(char *name, size_t name_len) {
+  int ret = -1;
+
+#ifdef _WIN32
+  int i;
+  LONG err;
+  HKEY hKey, hSub;
+  wchar_t subkey[512], value[128],
+      *key = L"SYSTEM\\ControlSet001\\Services\\Tcpip\\Parameters\\Interfaces";
+
+  if ((err = RegOpenKeyExW(HKEY_LOCAL_MACHINE, key, 0, KEY_READ, &hKey)) !=
+      ERROR_SUCCESS) {
+    fprintf(stderr, "cannot open reg key %S: %ld\n", key, err);
+    ret = -1;
+  } else {
+    for (ret = -1, i = 0; 1; i++) {
+      DWORD subkey_size = sizeof(subkey), type, len = sizeof(value);
+      if (RegEnumKeyExW(hKey, i, subkey, &subkey_size, NULL, NULL, NULL,
+                        NULL) != ERROR_SUCCESS) {
+        break;
+      }
+      if (RegOpenKeyExW(hKey, subkey, 0, KEY_READ, &hSub) == ERROR_SUCCESS &&
+          (RegQueryValueExW(hSub, L"NameServer", 0, &type, (void *) value,
+                            &len) == ERROR_SUCCESS ||
+           RegQueryValueExW(hSub, L"DhcpNameServer", 0, &type, (void *) value,
+                            &len) == ERROR_SUCCESS)) {
+        /*
+         * See https://github.com/cesanta/mongoose/issues/176
+         * The value taken from the registry can be empty, a single
+         * IP address, or multiple IP addresses separated by comma.
+         * If it's empty, check the next interface.
+         * If it's multiple IP addresses, take the first one.
+         */
+        wchar_t *comma = wcschr(value, ',');
+        if (value[0] == '\0') {
+          continue;
+        }
+        if (comma != NULL) {
+          *comma = '\0';
+        }
+        snprintf(name, name_len, "udp://%S:53", value);
+        ret = 0;
+        RegCloseKey(hSub);
+        break;
+      }
+    }
+    RegCloseKey(hKey);
+  }
+#elif MG_ENABLE_FILESYSTEM
+  FILE *fp;
+  char line[512];
+
+  if ((fp = mg_fopen("/etc/resolv.conf", "r")) == NULL) {
+    ret = -1;
+  } else {
+    /* Try to figure out what nameserver to use */
+    for (ret = -1; fgets(line, sizeof(line), fp) != NULL;) {
+      unsigned int a, b, c, d;
+      if (sscanf(line, "nameserver %u.%u.%u.%u", &a, &b, &c, &d) == 4) {
+        snprintf(name, name_len, "udp://%u.%u.%u.%u:53", a, b, c, d);
+        ret = 0;
+        break;
+      }
+    }
+    (void) fclose(fp);
+  }
+#else
+  snprintf(name, name_len, "%s", mg_default_dns_server);
+#endif /* _WIN32 */
+
+  return ret;
+}
+
+int mg_resolve_from_hosts_file(const char *name, union socket_address *usa) {
+#if MG_ENABLE_FILESYSTEM
+  /* TODO(mkm) cache /etc/hosts */
+  FILE *fp;
+  char line[1024];
+  char *p;
+  char alias[256];
+  unsigned int a, b, c, d;
+  int len = 0;
+
+  if ((fp = mg_fopen("/etc/hosts", "r")) == NULL) {
+    return -1;
+  }
+
+  for (; fgets(line, sizeof(line), fp) != NULL;) {
+    if (line[0] == '#') continue;
+
+    if (sscanf(line, "%u.%u.%u.%u%n", &a, &b, &c, &d, &len) == 0) {
+      /* TODO(mkm): handle ipv6 */
+      continue;
+    }
+    for (p = line + len; sscanf(p, "%s%n", alias, &len) == 1; p += len) {
+      if (strcmp(alias, name) == 0) {
+        usa->sin.sin_addr.s_addr = htonl(a << 24 | b << 16 | c << 8 | d);
+        fclose(fp);
+        return 0;
+      }
+    }
+  }
+
+  fclose(fp);
+#else
+  (void) name;
+  (void) usa;
+#endif
+
+  return -1;
+}
+
+static void mg_resolve_async_eh(struct mg_connection *nc, int ev, void *data) {
+  time_t now = (time_t) mg_time();
+  struct mg_resolve_async_request *req;
+  struct mg_dns_message *msg;
+  int first = 0;
+
+  if (ev != MG_EV_POLL) DBG(("ev=%d user_data=%p", ev, nc->user_data));
+
+  req = (struct mg_resolve_async_request *) nc->user_data;
+
+  if (req == NULL) {
+    return;
+  }
+
+  switch (ev) {
+    case MG_EV_CONNECT:
+      /* don't depend on timer not being at epoch for sending out first req */
+      first = 1;
+    /* fallthrough */
+    case MG_EV_POLL:
+      if (req->retries > req->max_retries) {
+        req->err = MG_RESOLVE_EXCEEDED_RETRY_COUNT;
+        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+        break;
+      }
+      if (first || now - req->last_time >= req->timeout) {
+        mg_send_dns_query(nc, req->name, req->query);
+        req->last_time = now;
+        req->retries++;
+      }
+      break;
+    case MG_EV_RECV:
+      msg = (struct mg_dns_message *) MG_MALLOC(sizeof(*msg));
+      if (mg_parse_dns(nc->recv_mbuf.buf, *(int *) data, msg) == 0 &&
+          msg->num_answers > 0) {
+        req->callback(msg, req->data, MG_RESOLVE_OK);
+        nc->user_data = NULL;
+        MG_FREE(req);
+      } else {
+        req->err = MG_RESOLVE_NO_ANSWERS;
+      }
+      MG_FREE(msg);
+      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+      break;
+    case MG_EV_SEND:
+      /*
+       * If a send error occurs, prevent closing of the connection by the core.
+       * We will retry after timeout.
+       */
+      nc->flags &= ~MG_F_CLOSE_IMMEDIATELY;
+      mbuf_remove(&nc->send_mbuf, nc->send_mbuf.len);
+      break;
+    case MG_EV_TIMER:
+      req->err = MG_RESOLVE_TIMEOUT;
+      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+      break;
+    case MG_EV_CLOSE:
+      /* If we got here with request still not done, fire an error callback. */
+      if (req != NULL) {
+        req->callback(NULL, req->data, req->err);
+        nc->user_data = NULL;
+        MG_FREE(req);
+      }
+      break;
+  }
+}
+
+int mg_resolve_async(struct mg_mgr *mgr, const char *name, int query,
+                     mg_resolve_callback_t cb, void *data) {
+  struct mg_resolve_async_opts opts;
+  memset(&opts, 0, sizeof(opts));
+  return mg_resolve_async_opt(mgr, name, query, cb, data, opts);
+}
+
+int mg_resolve_async_opt(struct mg_mgr *mgr, const char *name, int query,
+                         mg_resolve_callback_t cb, void *data,
+                         struct mg_resolve_async_opts opts) {
+  struct mg_resolve_async_request *req;
+  struct mg_connection *dns_nc;
+  const char *nameserver = opts.nameserver_url;
+
+  DBG(("%s %d %p", name, query, opts.dns_conn));
+
+  /* resolve with DNS */
+  req = (struct mg_resolve_async_request *) MG_CALLOC(1, sizeof(*req));
+  if (req == NULL) {
+    return -1;
+  }
+
+  strncpy(req->name, name, sizeof(req->name));
+  req->query = query;
+  req->callback = cb;
+  req->data = data;
+  /* TODO(mkm): parse defaults out of resolve.conf */
+  req->max_retries = opts.max_retries ? opts.max_retries : 2;
+  req->timeout = opts.timeout ? opts.timeout : 5;
+
+  /* Lazily initialize dns server */
+  if (nameserver == NULL && mg_dns_server[0] == '\0' &&
+      mg_get_ip_address_of_nameserver(mg_dns_server, sizeof(mg_dns_server)) ==
+          -1) {
+    strncpy(mg_dns_server, mg_default_dns_server, sizeof(mg_dns_server));
+  }
+
+  if (nameserver == NULL) {
+    nameserver = mg_dns_server;
+  }
+
+  dns_nc = mg_connect(mgr, nameserver, mg_resolve_async_eh);
+  if (dns_nc == NULL) {
+    MG_FREE(req);
+    return -1;
+  }
+  dns_nc->user_data = req;
+  if (opts.dns_conn != NULL) {
+    *opts.dns_conn = dns_nc;
+  }
+
+  return 0;
+}
+
+#endif /* MG_ENABLE_ASYNC_RESOLVER */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/coap.c"
+#endif
+/*
+ * Copyright (c) 2015 Cesanta Software Limited
+ * All rights reserved
+ * This software is dual-licensed: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation. For the terms of this
+ * license, see <http://www.gnu.org/licenses/>.
+ *
+ * You are free to use this software under the terms of the GNU General
+ * Public License, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * Alternatively, you can license this software under a commercial
+ * license, as set out in <https://www.cesanta.com/license>.
+ */
+
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/coap.h" */
+
+#if MG_ENABLE_COAP
+
+void mg_coap_free_options(struct mg_coap_message *cm) {
+  while (cm->options != NULL) {
+    struct mg_coap_option *next = cm->options->next;
+    MG_FREE(cm->options);
+    cm->options = next;
+  }
+}
+
+struct mg_coap_option *mg_coap_add_option(struct mg_coap_message *cm,
+                                          uint32_t number, char *value,
+                                          size_t len) {
+  struct mg_coap_option *new_option =
+      (struct mg_coap_option *) MG_CALLOC(1, sizeof(*new_option));
+
+  new_option->number = number;
+  new_option->value.p = value;
+  new_option->value.len = len;
+
+  if (cm->options == NULL) {
+    cm->options = cm->optiomg_tail = new_option;
+  } else {
+    /*
+     * A very simple attention to help clients to compose options:
+     * CoAP wants to see options ASC ordered.
+     * Could be change by using sort in coap_compose
+     */
+    if (cm->optiomg_tail->number <= new_option->number) {
+      /* if option is already ordered just add it */
+      cm->optiomg_tail = cm->optiomg_tail->next = new_option;
+    } else {
+      /* looking for appropriate position */
+      struct mg_coap_option *current_opt = cm->options;
+      struct mg_coap_option *prev_opt = 0;
+
+      while (current_opt != NULL) {
+        if (current_opt->number > new_option->number) {
+          break;
+        }
+        prev_opt = current_opt;
+        current_opt = current_opt->next;
+      }
+
+      if (prev_opt != NULL) {
+        prev_opt->next = new_option;
+        new_option->next = current_opt;
+      } else {
+        /* insert new_option to the beginning */
+        new_option->next = cm->options;
+        cm->options = new_option;
+      }
+    }
+  }
+
+  return new_option;
+}
+
+/*
+ * Fills CoAP header in mg_coap_message.
+ *
+ * Helper function.
+ */
+static char *coap_parse_header(char *ptr, struct mbuf *io,
+                               struct mg_coap_message *cm) {
+  if (io->len < sizeof(uint32_t)) {
+    cm->flags |= MG_COAP_NOT_ENOUGH_DATA;
+    return NULL;
+  }
+
+  /*
+   * Version (Ver):  2-bit unsigned integer.  Indicates the CoAP version
+   * number.  Implementations of this specification MUST set this field
+   * to 1 (01 binary).  Other values are reserved for future versions.
+   * Messages with unknown version numbers MUST be silently ignored.
+   */
+  if (((uint8_t) *ptr >> 6) != 1) {
+    cm->flags |= MG_COAP_IGNORE;
+    return NULL;
+  }
+
+  /*
+   * Type (T):  2-bit unsigned integer.  Indicates if this message is of
+   * type Confirmable (0), Non-confirmable (1), Acknowledgement (2), or
+   * Reset (3).
+   */
+  cm->msg_type = ((uint8_t) *ptr & 0x30) >> 4;
+  cm->flags |= MG_COAP_MSG_TYPE_FIELD;
+
+  /*
+   * Token Length (TKL):  4-bit unsigned integer.  Indicates the length of
+   * the variable-length Token field (0-8 bytes).  Lengths 9-15 are
+   * reserved, MUST NOT be sent, and MUST be processed as a message
+   * format error.
+   */
+  cm->token.len = *ptr & 0x0F;
+  if (cm->token.len > 8) {
+    cm->flags |= MG_COAP_FORMAT_ERROR;
+    return NULL;
+  }
+
+  ptr++;
+
+  /*
+   * Code:  8-bit unsigned integer, split into a 3-bit class (most
+   * significant bits) and a 5-bit detail (least significant bits)
+   */
+  cm->code_class = (uint8_t) *ptr >> 5;
+  cm->code_detail = *ptr & 0x1F;
+  cm->flags |= (MG_COAP_CODE_CLASS_FIELD | MG_COAP_CODE_DETAIL_FIELD);
+
+  ptr++;
+
+  /* Message ID:  16-bit unsigned integer in network byte order. */
+  cm->msg_id = (uint8_t) *ptr << 8 | (uint8_t) * (ptr + 1);
+  cm->flags |= MG_COAP_MSG_ID_FIELD;
+
+  ptr += 2;
+
+  return ptr;
+}
+
+/*
+ * Fills token information in mg_coap_message.
+ *
+ * Helper function.
+ */
+static char *coap_get_token(char *ptr, struct mbuf *io,
+                            struct mg_coap_message *cm) {
+  if (cm->token.len != 0) {
+    if (ptr + cm->token.len > io->buf + io->len) {
+      cm->flags |= MG_COAP_NOT_ENOUGH_DATA;
+      return NULL;
+    } else {
+      cm->token.p = ptr;
+      ptr += cm->token.len;
+      cm->flags |= MG_COAP_TOKEN_FIELD;
+    }
+  }
+
+  return ptr;
+}
+
+/*
+ * Returns Option Delta or Length.
+ *
+ * Helper function.
+ */
+static int coap_get_ext_opt(char *ptr, struct mbuf *io, uint16_t *opt_info) {
+  int ret = 0;
+
+  if (*opt_info == 13) {
+    /*
+     * 13:  An 8-bit unsigned integer follows the initial byte and
+     * indicates the Option Delta/Length minus 13.
+     */
+    if (ptr < io->buf + io->len) {
+      *opt_info = (uint8_t) *ptr + 13;
+      ret = sizeof(uint8_t);
+    } else {
+      ret = -1; /* LCOV_EXCL_LINE */
+    }
+  } else if (*opt_info == 14) {
+    /*
+     * 14:  A 16-bit unsigned integer in network byte order follows the
+     * initial byte and indicates the Option Delta/Length minus 269.
+     */
+    if (ptr + sizeof(uint8_t) < io->buf + io->len) {
+      *opt_info = ((uint8_t) *ptr << 8 | (uint8_t) * (ptr + 1)) + 269;
+      ret = sizeof(uint16_t);
+    } else {
+      ret = -1; /* LCOV_EXCL_LINE */
+    }
+  }
+
+  return ret;
+}
+
+/*
+ * Fills options in mg_coap_message.
+ *
+ * Helper function.
+ *
+ * General options format:
+ * +---------------+---------------+
+ * | Option Delta  | Option Length |  1 byte
+ * +---------------+---------------+
+ * \    Option Delta (extended)    \  0-2 bytes
+ * +-------------------------------+
+ * / Option Length  (extended)     \  0-2 bytes
+ * +-------------------------------+
+ * \         Option Value          \  0 or more bytes
+ * +-------------------------------+
+ */
+static char *coap_get_options(char *ptr, struct mbuf *io,
+                              struct mg_coap_message *cm) {
+  uint16_t prev_opt = 0;
+
+  if (ptr == io->buf + io->len) {
+    /* end of packet, ok */
+    return NULL;
+  }
+
+  /* 0xFF is payload marker */
+  while (ptr < io->buf + io->len && (uint8_t) *ptr != 0xFF) {
+    uint16_t option_delta, option_lenght;
+    int optinfo_len;
+
+    /* Option Delta:  4-bit unsigned integer */
+    option_delta = ((uint8_t) *ptr & 0xF0) >> 4;
+    /* Option Length:  4-bit unsigned integer */
+    option_lenght = *ptr & 0x0F;
+
+    if (option_delta == 15 || option_lenght == 15) {
+      /*
+       * 15:  Reserved for future use.  If the field is set to this value,
+       * it MUST be processed as a message format error
+       */
+      cm->flags |= MG_COAP_FORMAT_ERROR;
+      break;
+    }
+
+    ptr++;
+
+    /* check for extended option delta */
+    optinfo_len = coap_get_ext_opt(ptr, io, &option_delta);
+    if (optinfo_len == -1) {
+      cm->flags |= MG_COAP_NOT_ENOUGH_DATA; /* LCOV_EXCL_LINE */
+      break;                                /* LCOV_EXCL_LINE */
+    }
+
+    ptr += optinfo_len;
+
+    /* check or extended option lenght */
+    optinfo_len = coap_get_ext_opt(ptr, io, &option_lenght);
+    if (optinfo_len == -1) {
+      cm->flags |= MG_COAP_NOT_ENOUGH_DATA; /* LCOV_EXCL_LINE */
+      break;                                /* LCOV_EXCL_LINE */
+    }
+
+    ptr += optinfo_len;
+
+    /*
+     * Instead of specifying the Option Number directly, the instances MUST
+     * appear in order of their Option Numbers and a delta encoding is used
+     * between them.
+     */
+    option_delta += prev_opt;
+
+    mg_coap_add_option(cm, option_delta, ptr, option_lenght);
+
+    prev_opt = option_delta;
+
+    if (ptr + option_lenght > io->buf + io->len) {
+      cm->flags |= MG_COAP_NOT_ENOUGH_DATA; /* LCOV_EXCL_LINE */
+      break;                                /* LCOV_EXCL_LINE */
+    }
+
+    ptr += option_lenght;
+  }
+
+  if ((cm->flags & MG_COAP_ERROR) != 0) {
+    mg_coap_free_options(cm);
+    return NULL;
+  }
+
+  cm->flags |= MG_COAP_OPTIOMG_FIELD;
+
+  if (ptr == io->buf + io->len) {
+    /* end of packet, ok */
+    return NULL;
+  }
+
+  ptr++;
+
+  return ptr;
+}
+
+uint32_t mg_coap_parse(struct mbuf *io, struct mg_coap_message *cm) {
+  char *ptr;
+
+  memset(cm, 0, sizeof(*cm));
+
+  if ((ptr = coap_parse_header(io->buf, io, cm)) == NULL) {
+    return cm->flags;
+  }
+
+  if ((ptr = coap_get_token(ptr, io, cm)) == NULL) {
+    return cm->flags;
+  }
+
+  if ((ptr = coap_get_options(ptr, io, cm)) == NULL) {
+    return cm->flags;
+  }
+
+  /* the rest is payload */
+  cm->payload.len = io->len - (ptr - io->buf);
+  if (cm->payload.len != 0) {
+    cm->payload.p = ptr;
+    cm->flags |= MG_COAP_PAYLOAD_FIELD;
+  }
+
+  return cm->flags;
+}
+
+/*
+ * Calculates extended size of given Opt Number/Length in coap message.
+ *
+ * Helper function.
+ */
+static size_t coap_get_ext_opt_size(uint32_t value) {
+  int ret = 0;
+
+  if (value >= 13 && value <= 0xFF + 13) {
+    ret = sizeof(uint8_t);
+  } else if (value > 0xFF + 13 && value <= 0xFFFF + 269) {
+    ret = sizeof(uint16_t);
+  }
+
+  return ret;
+}
+
+/*
+ * Splits given Opt Number/Length into base and ext values.
+ *
+ * Helper function.
+ */
+static int coap_split_opt(uint32_t value, uint8_t *base, uint16_t *ext) {
+  int ret = 0;
+
+  if (value < 13) {
+    *base = value;
+  } else if (value >= 13 && value <= 0xFF + 13) {
+    *base = 13;
+    *ext = value - 13;
+    ret = sizeof(uint8_t);
+  } else if (value > 0xFF + 13 && value <= 0xFFFF + 269) {
+    *base = 14;
+    *ext = value - 269;
+    ret = sizeof(uint16_t);
+  }
+
+  return ret;
+}
+
+/*
+ * Puts uint16_t (in network order) into given char stream.
+ *
+ * Helper function.
+ */
+static char *coap_add_uint16(char *ptr, uint16_t val) {
+  *ptr = val >> 8;
+  ptr++;
+  *ptr = val & 0x00FF;
+  ptr++;
+  return ptr;
+}
+
+/*
+ * Puts extended value of Opt Number/Length into given char stream.
+ *
+ * Helper function.
+ */
+static char *coap_add_opt_info(char *ptr, uint16_t val, size_t len) {
+  if (len == sizeof(uint8_t)) {
+    *ptr = (char) val;
+    ptr++;
+  } else if (len == sizeof(uint16_t)) {
+    ptr = coap_add_uint16(ptr, val);
+  }
+
+  return ptr;
+}
+
+/*
+ * Verifies given mg_coap_message and calculates message size for it.
+ *
+ * Helper function.
+ */
+static uint32_t coap_calculate_packet_size(struct mg_coap_message *cm,
+                                           size_t *len) {
+  struct mg_coap_option *opt;
+  uint32_t prev_opt_number;
+
+  *len = 4; /* header */
+  if (cm->msg_type > MG_COAP_MSG_MAX) {
+    return MG_COAP_ERROR | MG_COAP_MSG_TYPE_FIELD;
+  }
+  if (cm->token.len > 8) {
+    return MG_COAP_ERROR | MG_COAP_TOKEN_FIELD;
+  }
+  if (cm->code_class > 7) {
+    return MG_COAP_ERROR | MG_COAP_CODE_CLASS_FIELD;
+  }
+  if (cm->code_detail > 31) {
+    return MG_COAP_ERROR | MG_COAP_CODE_DETAIL_FIELD;
+  }
+
+  *len += cm->token.len;
+  if (cm->payload.len != 0) {
+    *len += cm->payload.len + 1; /* ... + 1; add payload marker */
+  }
+
+  opt = cm->options;
+  prev_opt_number = 0;
+  while (opt != NULL) {
+    *len += 1; /* basic delta/length */
+    *len += coap_get_ext_opt_size(opt->number - prev_opt_number);
+    *len += coap_get_ext_opt_size((uint32_t) opt->value.len);
+    /*
+     * Current implementation performs check if
+     * option_number > previous option_number and produces an error
+     * TODO(alashkin): write design doc with limitations
+     * May be resorting is more suitable solution.
+     */
+    if ((opt->next != NULL && opt->number > opt->next->number) ||
+        opt->value.len > 0xFFFF + 269 ||
+        opt->number - prev_opt_number > 0xFFFF + 269) {
+      return MG_COAP_ERROR | MG_COAP_OPTIOMG_FIELD;
+    }
+    *len += opt->value.len;
+    prev_opt_number = opt->number;
+    opt = opt->next;
+  }
+
+  return 0;
+}
+
+uint32_t mg_coap_compose(struct mg_coap_message *cm, struct mbuf *io) {
+  struct mg_coap_option *opt;
+  uint32_t res, prev_opt_number;
+  size_t prev_io_len, packet_size;
+  char *ptr;
+
+  res = coap_calculate_packet_size(cm, &packet_size);
+  if (res != 0) {
+    return res;
+  }
+
+  /* saving previous lenght to handle non-empty mbuf */
+  prev_io_len = io->len;
+  mbuf_append(io, NULL, packet_size);
+  ptr = io->buf + prev_io_len;
+
+  /*
+   * since cm is verified, it is possible to use bits shift operator
+   * without additional zeroing of unused bits
+   */
+
+  /* ver: 2 bits, msg_type: 2 bits, toklen: 4 bits */
+  *ptr = (1 << 6) | (cm->msg_type << 4) | (uint8_t)(cm->token.len);
+  ptr++;
+
+  /* code class: 3 bits, code detail: 5 bits */
+  *ptr = (cm->code_class << 5) | (cm->code_detail);
+  ptr++;
+
+  ptr = coap_add_uint16(ptr, cm->msg_id);
+
+  if (cm->token.len != 0) {
+    memcpy(ptr, cm->token.p, cm->token.len);
+    ptr += cm->token.len;
+  }
+
+  opt = cm->options;
+  prev_opt_number = 0;
+  while (opt != NULL) {
+    uint8_t delta_base = 0, length_base = 0;
+    uint16_t delta_ext = 0, length_ext = 0;
+
+    size_t opt_delta_len =
+        coap_split_opt(opt->number - prev_opt_number, &delta_base, &delta_ext);
+    size_t opt_lenght_len =
+        coap_split_opt((uint32_t) opt->value.len, &length_base, &length_ext);
+
+    *ptr = (delta_base << 4) | length_base;
+    ptr++;
+
+    ptr = coap_add_opt_info(ptr, delta_ext, opt_delta_len);
+    ptr = coap_add_opt_info(ptr, length_ext, opt_lenght_len);
+
+    if (opt->value.len != 0) {
+      memcpy(ptr, opt->value.p, opt->value.len);
+      ptr += opt->value.len;
+    }
+
+    prev_opt_number = opt->number;
+    opt = opt->next;
+  }
+
+  if (cm->payload.len != 0) {
+    *ptr = (char) -1;
+    ptr++;
+    memcpy(ptr, cm->payload.p, cm->payload.len);
+  }
+
+  return 0;
+}
+
+uint32_t mg_coap_send_message(struct mg_connection *nc,
+                              struct mg_coap_message *cm) {
+  struct mbuf packet_out;
+  uint32_t compose_res;
+
+  mbuf_init(&packet_out, 0);
+  compose_res = mg_coap_compose(cm, &packet_out);
+  if (compose_res != 0) {
+    return compose_res; /* LCOV_EXCL_LINE */
+  }
+
+  mg_send(nc, packet_out.buf, (int) packet_out.len);
+  mbuf_free(&packet_out);
+
+  return 0;
+}
+
+uint32_t mg_coap_send_ack(struct mg_connection *nc, uint16_t msg_id) {
+  struct mg_coap_message cm;
+  memset(&cm, 0, sizeof(cm));
+  cm.msg_type = MG_COAP_MSG_ACK;
+  cm.msg_id = msg_id;
+
+  return mg_coap_send_message(nc, &cm);
+}
+
+static void coap_handler(struct mg_connection *nc, int ev, void *ev_data) {
+  struct mbuf *io = &nc->recv_mbuf;
+  struct mg_coap_message cm;
+  uint32_t parse_res;
+
+  memset(&cm, 0, sizeof(cm));
+
+  nc->handler(nc, ev, ev_data);
+
+  switch (ev) {
+    case MG_EV_RECV:
+      parse_res = mg_coap_parse(io, &cm);
+      if ((parse_res & MG_COAP_IGNORE) == 0) {
+        if ((cm.flags & MG_COAP_NOT_ENOUGH_DATA) != 0) {
+          /*
+           * Since we support UDP only
+           * MG_COAP_NOT_ENOUGH_DATA == MG_COAP_FORMAT_ERROR
+           */
+          cm.flags |= MG_COAP_FORMAT_ERROR; /* LCOV_EXCL_LINE */
+        }                                   /* LCOV_EXCL_LINE */
+        nc->handler(nc, MG_COAP_EVENT_BASE + cm.msg_type, &cm);
+      }
+
+      mg_coap_free_options(&cm);
+      mbuf_remove(io, io->len);
+      break;
+  }
+}
+/*
+ * Attach built-in CoAP event handler to the given connection.
+ *
+ * The user-defined event handler will receive following extra events:
+ *
+ * - MG_EV_COAP_CON
+ * - MG_EV_COAP_NOC
+ * - MG_EV_COAP_ACK
+ * - MG_EV_COAP_RST
+ */
+int mg_set_protocol_coap(struct mg_connection *nc) {
+  /* supports UDP only */
+  if ((nc->flags & MG_F_UDP) == 0) {
+    return -1;
+  }
+
+  nc->proto_handler = coap_handler;
+
+  return 0;
+}
+
+#endif /* MG_ENABLE_COAP */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/tun.c"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_TUN
+
+/* Amalgamated: #include "common/cs_dbg.h" */
+/* Amalgamated: #include "mongoose/src/http.h" */
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/net.h" */
+/* Amalgamated: #include "mongoose/src/net_if_tun.h" */
+/* Amalgamated: #include "mongoose/src/tun.h" */
+/* Amalgamated: #include "mongoose/src/util.h" */
+
+static void mg_tun_reconnect(struct mg_tun_client *client, int timeout);
+
+static void mg_tun_init_client(struct mg_tun_client *client, struct mg_mgr *mgr,
+                               struct mg_iface *iface, const char *dispatcher,
+                               struct mg_tun_ssl_opts ssl) {
+  client->mgr = mgr;
+  client->iface = iface;
+  client->disp_url = dispatcher;
+  client->last_stream_id = 0;
+  client->ssl = ssl;
+
+  client->disp = NULL;      /* will be set by mg_tun_reconnect */
+  client->listener = NULL;  /* will be set by mg_do_bind */
+  client->reconnect = NULL; /* will be set by mg_tun_reconnect */
+}
+
+void mg_tun_log_frame(struct mg_tun_frame *frame) {
+  LOG(LL_DEBUG, ("Got TUN frame: type=0x%x, flags=0x%x stream_id=0x%lx, "
+                 "len=%zu",
+                 frame->type, frame->flags, frame->stream_id, frame->body.len));
+#if MG_ENABLE_HEXDUMP
+  {
+    char hex[512];
+    mg_hexdump(frame->body.p, frame->body.len, hex, sizeof(hex) - 1);
+    hex[sizeof(hex) - 1] = '\0';
+    LOG(LL_DEBUG, ("body:\n%s", hex));
+  }
+#else
+  LOG(LL_DEBUG, ("body: '%.*s'", (int) frame->body.len, frame->body.p));
+#endif
+}
+
+static void mg_tun_close_all(struct mg_tun_client *client) {
+  struct mg_connection *nc;
+  for (nc = client->mgr->active_connections; nc != NULL; nc = nc->next) {
+    if (nc->iface == client->iface && !(nc->flags & MG_F_LISTENING)) {
+      LOG(LL_DEBUG, ("Closing tunneled connection %p", nc));
+      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+      /* mg_close_conn(nc); */
+    }
+  }
+}
+
+static void mg_tun_client_handler(struct mg_connection *nc, int ev,
+                                  void *ev_data) {
+  struct mg_tun_client *client = (struct mg_tun_client *) nc->user_data;
+
+  switch (ev) {
+    case MG_EV_CONNECT: {
+      int err = *(int *) ev_data;
+
+      if (err) {
+        LOG(LL_ERROR, ("Cannot connect to the tunnel dispatcher: %d", err));
+      } else {
+        LOG(LL_INFO, ("Connected to the tunnel dispatcher"));
+      }
+      break;
+    }
+    case MG_EV_HTTP_REPLY: {
+      struct http_message *hm = (struct http_message *) ev_data;
+
+      if (hm->resp_code != 200) {
+        LOG(LL_ERROR,
+            ("Tunnel dispatcher reply non-OK status code %d", hm->resp_code));
+      }
+      break;
+    }
+    case MG_EV_WEBSOCKET_HANDSHAKE_DONE: {
+      LOG(LL_INFO, ("Tunnel dispatcher handshake done"));
+      break;
+    }
+    case MG_EV_WEBSOCKET_FRAME: {
+      struct websocket_message *wm = (struct websocket_message *) ev_data;
+      struct mg_connection *tc;
+      struct mg_tun_frame frame;
+
+      if (mg_tun_parse_frame(wm->data, wm->size, &frame) == -1) {
+        LOG(LL_ERROR, ("Got invalid tun frame dropping", wm->size));
+        break;
+      }
+
+      mg_tun_log_frame(&frame);
+
+      tc = mg_tun_if_find_conn(client, frame.stream_id);
+      if (tc == NULL) {
+        if (frame.body.len > 0) {
+          LOG(LL_DEBUG, ("Got frame after receiving end has been closed"));
+        }
+        break;
+      }
+      if (frame.body.len > 0) {
+        mg_if_recv_tcp_cb(tc, (void *) frame.body.p, frame.body.len,
+                          0 /* own */);
+      }
+      if (frame.flags & MG_TUN_F_END_STREAM) {
+        LOG(LL_DEBUG, ("Closing tunneled connection because got end of stream "
+                       "from other end"));
+        tc->flags |= MG_F_CLOSE_IMMEDIATELY;
+        mg_close_conn(tc);
+      }
+      break;
+    }
+    case MG_EV_CLOSE: {
+      LOG(LL_DEBUG, ("Closing all tunneled connections"));
+      /*
+       * The client might have been already freed when the listening socket is
+       * closed.
+       */
+      if (client != NULL) {
+        mg_tun_close_all(client);
+        client->disp = NULL;
+        LOG(LL_INFO, ("Dispatcher connection is no more, reconnecting"));
+        /* TODO(mkm): implement exp back off */
+        mg_tun_reconnect(client, MG_TUN_RECONNECT_INTERVAL);
+      }
+      break;
+    }
+    default:
+      break;
+  }
+}
+
+static void mg_tun_do_reconnect(struct mg_tun_client *client) {
+  struct mg_connection *dc;
+  struct mg_connect_opts opts;
+  memset(&opts, 0, sizeof(opts));
+#if MG_ENABLE_SSL
+  opts.ssl_cert = client->ssl.ssl_cert;
+  opts.ssl_key = client->ssl.ssl_key;
+  opts.ssl_ca_cert = client->ssl.ssl_ca_cert;
+#endif
+  /* HTTP/Websocket listener */
+  if ((dc = mg_connect_ws_opt(client->mgr, mg_tun_client_handler, opts,
+                              client->disp_url, MG_TUN_PROTO_NAME, NULL)) ==
+      NULL) {
+    LOG(LL_ERROR,
+        ("Cannot connect to WS server on addr [%s]\n", client->disp_url));
+    return;
+  }
+
+  client->disp = dc;
+  dc->user_data = client;
+}
+
+void mg_tun_reconnect_ev_handler(struct mg_connection *nc, int ev,
+                                 void *ev_data) {
+  struct mg_tun_client *client = (struct mg_tun_client *) nc->user_data;
+  (void) ev_data;
+
+  switch (ev) {
+    case MG_EV_TIMER:
+      if (!(client->listener->flags & MG_F_TUN_DO_NOT_RECONNECT)) {
+        mg_tun_do_reconnect(client);
+      } else {
+        /* Reconnecting is suppressed, we'll check again at the next poll */
+        mg_tun_reconnect(client, 0);
+      }
+      break;
+  }
+}
+
+static void mg_tun_reconnect(struct mg_tun_client *client, int timeout) {
+  if (client->reconnect == NULL) {
+    client->reconnect =
+        mg_add_sock(client->mgr, INVALID_SOCKET, mg_tun_reconnect_ev_handler);
+    client->reconnect->user_data = client;
+  }
+  client->reconnect->ev_timer_time = mg_time() + timeout;
+}
+
+static struct mg_tun_client *mg_tun_create_client(struct mg_mgr *mgr,
+                                                  const char *dispatcher,
+                                                  struct mg_tun_ssl_opts ssl) {
+  struct mg_tun_client *client = NULL;
+  struct mg_iface *iface = mg_find_iface(mgr, &mg_tun_iface_vtable, NULL);
+  if (iface == NULL) {
+    LOG(LL_ERROR, ("The tun feature requires the manager to have a tun "
+                   "interface enabled"));
+    return NULL;
+  }
+
+  client = (struct mg_tun_client *) MG_MALLOC(sizeof(*client));
+  mg_tun_init_client(client, mgr, iface, dispatcher, ssl);
+  iface->data = client;
+
+  /*
+   * We need to give application a chance to set MG_F_TUN_DO_NOT_RECONNECT on a
+   * listening connection right after mg_tun_bind_opt() returned it, so we
+   * should use mg_tun_reconnect() here, instead of mg_tun_do_reconnect()
+   */
+  mg_tun_reconnect(client, 0);
+  return client;
+}
+
+void mg_tun_destroy_client(struct mg_tun_client *client) {
+  /*
+   *  NOTE:
+   * `client` is NULL in case of OOM
+   * `client->disp` is NULL if connection failed
+   * `client->iface is NULL is `mg_find_iface` failed
+   */
+
+  if (client != NULL && client->disp != NULL) {
+    /* the dispatcher connection handler will in turn close all tunnels */
+    client->disp->flags |= MG_F_CLOSE_IMMEDIATELY;
+    /* this is used as a signal to other tun handlers that the party is over */
+    client->disp->user_data = NULL;
+  }
+
+  if (client != NULL && client->reconnect != NULL) {
+    client->reconnect->flags |= MG_F_CLOSE_IMMEDIATELY;
+  }
+
+  if (client != NULL && client->iface != NULL) {
+    client->iface->data = NULL;
+  }
+
+  MG_FREE(client);
+}
+
+static struct mg_connection *mg_tun_do_bind(struct mg_tun_client *client,
+                                            mg_event_handler_t handler,
+                                            struct mg_bind_opts opts) {
+  struct mg_connection *lc;
+  opts.iface = client->iface;
+  lc = mg_bind_opt(client->mgr, ":1234" /* dummy port */, handler, opts);
+  client->listener = lc;
+  return lc;
+}
+
+struct mg_connection *mg_tun_bind_opt(struct mg_mgr *mgr,
+                                      const char *dispatcher,
+                                      mg_event_handler_t handler,
+                                      struct mg_bind_opts opts) {
+#if MG_ENABLE_SSL
+  struct mg_tun_ssl_opts ssl = {opts.ssl_cert, opts.ssl_key, opts.ssl_ca_cert};
+#else
+  struct mg_tun_ssl_opts ssl = {0};
+#endif
+  struct mg_tun_client *client = mg_tun_create_client(mgr, dispatcher, ssl);
+  if (client == NULL) {
+    return NULL;
+  }
+#if MG_ENABLE_SSL
+  /* these options don't make sense in the local mouth of the tunnel */
+  opts.ssl_cert = NULL;
+  opts.ssl_key = NULL;
+  opts.ssl_ca_cert = NULL;
+#endif
+  return mg_tun_do_bind(client, handler, opts);
+}
+
+int mg_tun_parse_frame(void *data, size_t len, struct mg_tun_frame *frame) {
+  const size_t header_size = sizeof(uint32_t) + sizeof(uint8_t) * 2;
+  if (len < header_size) {
+    return -1;
+  }
+
+  frame->type = *(uint8_t *) (data);
+  frame->flags = *(uint8_t *) ((char *) data + 1);
+  memcpy(&frame->stream_id, (char *) data + 2, sizeof(uint32_t));
+  frame->stream_id = ntohl(frame->stream_id);
+  frame->body.p = (char *) data + header_size;
+  frame->body.len = len - header_size;
+  return 0;
+}
+
+void mg_tun_send_frame(struct mg_connection *ws, uint32_t stream_id,
+                       uint8_t type, uint8_t flags, struct mg_str msg) {
+  stream_id = htonl(stream_id);
+  {
+    struct mg_str parts[] = {
+        {(char *) &type, sizeof(type)},
+        {(char *) &flags, sizeof(flags)},
+        {(char *) &stream_id, sizeof(stream_id)},
+        {msg.p, msg.len} /* vc6 doesn't like just `msg` here */};
+    mg_send_websocket_framev(ws, WEBSOCKET_OP_BINARY, parts,
+                             sizeof(parts) / sizeof(parts[0]));
+  }
+}
+
+#endif /* MG_ENABLE_TUN */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/sntp.c"
+#endif
+/*
+ * Copyright (c) 2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/sntp.h" */
+/* Amalgamated: #include "mongoose/src/util.h" */
+
+#if MG_ENABLE_SNTP
+
+#define SNTP_TIME_OFFSET 2208988800
+
+#ifndef SNTP_TIMEOUT
+#define SNTP_TIMEOUT 10
+#endif
+
+#ifndef SNTP_ATTEMPTS
+#define SNTP_ATTEMPTS 3
+#endif
+
+static uint64_t mg_get_sec(uint64_t val) {
+  return (val & 0xFFFFFFFF00000000) >> 32;
+}
+
+static uint64_t mg_get_usec(uint64_t val) {
+  uint64_t tmp = (val & 0x00000000FFFFFFFF);
+  tmp *= 1000000;
+  tmp >>= 32;
+  return tmp;
+}
+
+static void mg_ntp_to_tv(uint64_t val, struct timeval *tv) {
+  uint64_t tmp;
+  tmp = mg_get_sec(val);
+  tmp -= SNTP_TIME_OFFSET;
+  tv->tv_sec = tmp;
+  tv->tv_usec = mg_get_usec(val);
+}
+
+static void mg_get_ntp_ts(const char *ntp, uint64_t *val) {
+  uint32_t tmp;
+  memcpy(&tmp, ntp, sizeof(tmp));
+  tmp = ntohl(tmp);
+  *val = (uint64_t) tmp << 32;
+  memcpy(&tmp, ntp + 4, sizeof(tmp));
+  tmp = ntohl(tmp);
+  *val |= tmp;
+}
+
+void mg_sntp_send_request(struct mg_connection *c) {
+  char buf[48] = {0};
+  /*
+   * header - 8 bit:
+   * LI (2 bit) - 3 (not in sync), VN (3 bit) - 4 (version),
+   * mode (3 bit) - 3 (client)
+   */
+  buf[0] = (3 << 6) | (4 << 3) | 3;
+
+/*
+ * Next fields should be empty in client request
+ * stratum, 8 bit
+ * poll interval, 8 bit
+ * rrecision, 8 bit
+ * root delay, 32 bit
+ * root dispersion, 32 bit
+ * ref id, 32 bit
+ * ref timestamp, 64 bit
+ * originate Timestamp, 64 bit
+ * receive Timestamp, 64 bit
+*/
+
+/*
+ * convert time to sntp format (sntp starts from 00:00:00 01.01.1900)
+ * according to rfc868 it is 2208988800L sec
+ * this information is used to correct roundtrip delay
+ * but if local clock is absolutely broken (and doesn't work even
+ * as simple timer), it is better to disable it
+*/
+#ifndef MG_SNMP_NO_DELAY_CORRECTION
+  uint32_t sec;
+  sec = htonl(mg_time() + SNTP_TIME_OFFSET);
+  memcpy(&buf[40], &sec, sizeof(sec));
+#endif
+
+  mg_send(c, buf, sizeof(buf));
+}
+
+#ifndef MG_SNMP_NO_DELAY_CORRECTION
+static uint64_t mg_calculate_delay(uint64_t t1, uint64_t t2, uint64_t t3) {
+  /* roundloop delay = (T4 - T1) - (T3 - T2) */
+  uint64_t d1 = ((mg_time() + SNTP_TIME_OFFSET) * 1000000) -
+                (mg_get_sec(t1) * 1000000 + mg_get_usec(t1));
+  uint64_t d2 = (mg_get_sec(t3) * 1000000 + mg_get_usec(t3)) -
+                (mg_get_sec(t2) * 1000000 + mg_get_usec(t2));
+
+  return (d1 > d2) ? d1 - d2 : 0;
+}
+#endif
+
+MG_INTERNAL int mg_sntp_parse_reply(const char *buf, int len,
+                                    struct mg_sntp_message *msg) {
+  uint8_t hdr;
+  uint64_t orig_ts_T1, recv_ts_T2, trsm_ts_T3, delay = 0;
+  int mode;
+  struct timeval tv;
+
+  (void) orig_ts_T1;
+  (void) recv_ts_T2;
+  if (len < 48) {
+    return -1;
+  }
+
+  hdr = buf[0];
+
+  if ((hdr & 0x38) >> 3 != 4) {
+    /* Wrong version */
+    return -1;
+  }
+
+  mode = hdr & 0x7;
+  if (mode != 4 && mode != 5) {
+    /* Not a server reply */
+    return -1;
+  }
+
+  memset(msg, 0, sizeof(*msg));
+
+  msg->kiss_of_death = (buf[1] == 0); /* Server asks to not send requests */
+
+  mg_get_ntp_ts(&buf[40], &trsm_ts_T3);
+
+#ifndef MG_SNMP_NO_DELAY_CORRECTION
+  mg_get_ntp_ts(&buf[24], &orig_ts_T1);
+  mg_get_ntp_ts(&buf[32], &recv_ts_T2);
+  delay = mg_calculate_delay(orig_ts_T1, recv_ts_T2, trsm_ts_T3);
+#endif
+
+  mg_ntp_to_tv(trsm_ts_T3, &tv);
+
+  msg->time = (double) tv.tv_sec + (((double) tv.tv_usec + delay) / 1000000.0);
+
+  return 0;
+}
+
+static void mg_sntp_handler(struct mg_connection *c, int ev, void *ev_data) {
+  struct mbuf *io = &c->recv_mbuf;
+  struct mg_sntp_message msg;
+
+  c->handler(c, ev, ev_data);
+
+  switch (ev) {
+    case MG_EV_RECV: {
+      if (mg_sntp_parse_reply(io->buf, io->len, &msg) < 0) {
+        DBG(("Invalid SNTP packet received (%d)", (int) io->len));
+        c->handler(c, MG_SNTP_MALFORMED_REPLY, NULL);
+      } else {
+        c->handler(c, MG_SNTP_REPLY, (void *) &msg);
+      }
+
+      mbuf_remove(io, io->len);
+      break;
+    }
+  }
+}
+
+int mg_set_protocol_sntp(struct mg_connection *c) {
+  if ((c->flags & MG_F_UDP) == 0) {
+    return -1;
+  }
+
+  c->proto_handler = mg_sntp_handler;
+
+  return 0;
+}
+
+struct mg_connection *mg_sntp_connect(struct mg_mgr *mgr,
+                                      mg_event_handler_t event_handler,
+                                      const char *sntp_server_name) {
+  struct mg_connection *c = NULL;
+  char url[100], *p_url = url;
+  const char *proto = "", *port = "", *tmp;
+
+  /* If port is not specified, use default (123) */
+  tmp = strchr(sntp_server_name, ':');
+  if (tmp != NULL && *(tmp + 1) == '/') {
+    tmp = strchr(tmp + 1, ':');
+  }
+
+  if (tmp == NULL) {
+    port = ":123";
+  }
+
+  /* Add udp:// if needed */
+  if (strncmp(sntp_server_name, "udp://", 6) != 0) {
+    proto = "udp://";
+  }
+
+  mg_asprintf(&p_url, sizeof(url), "%s%s%s", proto, sntp_server_name, port);
+
+  c = mg_connect(mgr, p_url, event_handler);
+
+  if (c == NULL) {
+    goto cleanup;
+  }
+
+  mg_set_protocol_sntp(c);
+
+cleanup:
+  if (p_url != url) {
+    MG_FREE(p_url);
+  }
+
+  return c;
+}
+
+struct sntp_data {
+  mg_event_handler_t hander;
+  int count;
+};
+
+static void mg_sntp_util_ev_handler(struct mg_connection *c, int ev,
+                                    void *ev_data) {
+  struct sntp_data *sd = (struct sntp_data *) c->user_data;
+
+  switch (ev) {
+    case MG_EV_CONNECT:
+      if (*(int *) ev_data != 0) {
+        mg_call(c, sd->hander, MG_SNTP_FAILED, NULL);
+        break;
+      }
+    /* fallthrough */
+    case MG_EV_TIMER:
+      if (sd->count <= SNTP_ATTEMPTS) {
+        mg_sntp_send_request(c);
+        mg_set_timer(c, mg_time() + 10);
+        sd->count++;
+      } else {
+        mg_call(c, sd->hander, MG_SNTP_FAILED, NULL);
+        c->flags |= MG_F_CLOSE_IMMEDIATELY;
+      }
+      break;
+    case MG_SNTP_MALFORMED_REPLY:
+      mg_call(c, sd->hander, MG_SNTP_FAILED, NULL);
+      c->flags |= MG_F_CLOSE_IMMEDIATELY;
+      break;
+    case MG_SNTP_REPLY:
+      mg_call(c, sd->hander, MG_SNTP_REPLY, ev_data);
+      c->flags |= MG_F_CLOSE_IMMEDIATELY;
+      break;
+    case MG_EV_CLOSE:
+      MG_FREE(c->user_data);
+      c->user_data = NULL;
+      break;
+  }
+}
+
+struct mg_connection *mg_sntp_get_time(struct mg_mgr *mgr,
+                                       mg_event_handler_t event_handler,
+                                       const char *sntp_server_name) {
+  struct mg_connection *c;
+  struct sntp_data *sd = (struct sntp_data *) MG_CALLOC(1, sizeof(*sd));
+  if (sd == NULL) {
+    return NULL;
+  }
+
+  c = mg_sntp_connect(mgr, mg_sntp_util_ev_handler, sntp_server_name);
+  if (c == NULL) {
+    MG_FREE(sd);
+    return NULL;
+  }
+
+  sd->hander = event_handler;
+  c->user_data = sd;
+
+  return c;
+}
+
+#endif /* MG_ENABLE_SNTP */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/cc3200/cc3200_libc.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if CS_PLATFORM == CS_P_CC3200
+
+#include <stdio.h>
+#include <string.h>
+
+#ifndef __TI_COMPILER_VERSION__
+#include <reent.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <unistd.h>
+#endif
+
+#include <inc/hw_types.h>
+#include <inc/hw_memmap.h>
+#include <driverlib/prcm.h>
+#include <driverlib/rom.h>
+#include <driverlib/rom_map.h>
+#include <driverlib/uart.h>
+#include <driverlib/utils.h>
+
+#define CONSOLE_UART UARTA0_BASE
+
+#ifdef __TI_COMPILER_VERSION__
+int asprintf(char **strp, const char *fmt, ...) {
+  va_list ap;
+  int len;
+
+  *strp = MG_MALLOC(BUFSIZ);
+  if (*strp == NULL) return -1;
+
+  va_start(ap, fmt);
+  len = vsnprintf(*strp, BUFSIZ, fmt, ap);
+  va_end(ap);
+
+  if (len > 0) {
+    *strp = MG_REALLOC(*strp, len + 1);
+    if (*strp == NULL) return -1;
+  }
+
+  if (len >= BUFSIZ) {
+    va_start(ap, fmt);
+    len = vsnprintf(*strp, len + 1, fmt, ap);
+    va_end(ap);
+  }
+
+  return len;
+}
+
+#if MG_TI_NO_HOST_INTERFACE
+time_t HOSTtime() {
+  struct timeval tp;
+  gettimeofday(&tp, NULL);
+  return tp.tv_sec;
+}
+#endif
+
+#endif /* __TI_COMPILER_VERSION__ */
+
+#ifndef __TI_COMPILER_VERSION__
+int _gettimeofday_r(struct _reent *r, struct timeval *tp, void *tzp) {
+#else
+int gettimeofday(struct timeval *tp, void *tzp) {
+#endif
+  unsigned long long r1 = 0, r2;
+  /* Achieve two consecutive reads of the same value. */
+  do {
+    r2 = r1;
+    r1 = PRCMSlowClkCtrFastGet();
+  } while (r1 != r2);
+  /* This is a 32768 Hz counter. */
+  tp->tv_sec = (r1 >> 15);
+  /* 1/32768-th of a second is 30.517578125 microseconds, approx. 31,
+   * but we round down so it doesn't overflow at 32767 */
+  tp->tv_usec = (r1 & 0x7FFF) * 30;
+  return 0;
+}
+
+void fprint_str(FILE *fp, const char *str) {
+  while (*str != '\0') {
+    if (*str == '\n') MAP_UARTCharPut(CONSOLE_UART, '\r');
+    MAP_UARTCharPut(CONSOLE_UART, *str++);
+  }
+}
+
+void _exit(int status) {
+  fprint_str(stderr, "_exit\n");
+  /* cause an unaligned access exception, that will drop you into gdb */
+  *(int *) 1 = status;
+  while (1)
+    ; /* avoid gcc warning because stdlib abort() has noreturn attribute */
+}
+
+void _not_implemented(const char *what) {
+  fprint_str(stderr, what);
+  fprint_str(stderr, " is not implemented\n");
+  _exit(42);
+}
+
+int _kill(int pid, int sig) {
+  (void) pid;
+  (void) sig;
+  _not_implemented("_kill");
+  return -1;
+}
+
+int _getpid() {
+  fprint_str(stderr, "_getpid is not implemented\n");
+  return 42;
+}
+
+int _isatty(int fd) {
+  /* 0, 1 and 2 are TTYs. */
+  return fd < 2;
+}
+
+#endif /* CS_PLATFORM == CS_P_CC3200 */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/msp432/msp432_libc.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if CS_PLATFORM == CS_P_MSP432
+
+#include <ti/sysbios/BIOS.h>
+#include <ti/sysbios/knl/Clock.h>
+
+int gettimeofday(struct timeval *tp, void *tzp) {
+  uint32_t ticks = Clock_getTicks();
+  tp->tv_sec = ticks / 1000;
+  tp->tv_usec = (ticks % 1000) * 1000;
+  return 0;
+}
+
+#endif /* CS_PLATFORM == CS_P_MSP432 */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/nrf5/nrf5_libc.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if (CS_PLATFORM == CS_P_NRF51 || CS_PLATFORM == CS_P_NRF52) && \
+    defined(__ARMCC_VERSION)
+int gettimeofday(struct timeval *tp, void *tzp) {
+  /* TODO */
+  tp->tv_sec = 0;
+  tp->tv_usec = 0;
+  return 0;
+}
+#endif
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/simplelink/sl_fs_slfs.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_SIMPLELINK_SL_FS_SLFS_H_
+#define CS_COMMON_PLATFORMS_SIMPLELINK_SL_FS_SLFS_H_
+
+#if defined(MG_FS_SLFS)
+
+#include <stdio.h>
+#ifndef __TI_COMPILER_VERSION__
+#include <unistd.h>
+#include <sys/stat.h>
+#endif
+
+#define MAX_OPEN_SLFS_FILES 8
+
+/* Indirect libc interface - same functions, different names. */
+int fs_slfs_open(const char *pathname, int flags, mode_t mode);
+int fs_slfs_close(int fd);
+ssize_t fs_slfs_read(int fd, void *buf, size_t count);
+ssize_t fs_slfs_write(int fd, const void *buf, size_t count);
+int fs_slfs_stat(const char *pathname, struct stat *s);
+int fs_slfs_fstat(int fd, struct stat *s);
+off_t fs_slfs_lseek(int fd, off_t offset, int whence);
+int fs_slfs_unlink(const char *filename);
+int fs_slfs_rename(const char *from, const char *to);
+
+void fs_slfs_set_new_file_size(const char *name, size_t size);
+
+#endif /* defined(MG_FS_SLFS) */
+
+#endif /* CS_COMMON_PLATFORMS_SIMPLELINK_SL_FS_SLFS_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/simplelink/sl_fs_slfs.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/* Standard libc interface to TI SimpleLink FS. */
+
+#if defined(MG_FS_SLFS) || defined(CC3200_FS_SLFS)
+
+/* Amalgamated: #include "common/platforms/simplelink/sl_fs_slfs.h" */
+
+#include <errno.h>
+
+#if CS_PLATFORM == CS_P_CC3200
+#include <inc/hw_types.h>
+#endif
+#include <simplelink/include/simplelink.h>
+#include <simplelink/include/fs.h>
+
+/* Amalgamated: #include "common/cs_dbg.h" */
+
+/* From sl_fs.c */
+extern int set_errno(int e);
+static const char *drop_dir(const char *fname, bool *is_slfs);
+
+/*
+ * With SLFS, you have to pre-declare max file size. Yes. Really.
+ * 64K should be enough for everyone. Right?
+ */
+#ifndef FS_SLFS_MAX_FILE_SIZE
+#define FS_SLFS_MAX_FILE_SIZE (64 * 1024)
+#endif
+
+struct sl_file_size_hint {
+  char *name;
+  size_t size;
+};
+
+struct sl_fd_info {
+  _i32 fh;
+  _off_t pos;
+  size_t size;
+};
+
+static struct sl_fd_info s_sl_fds[MAX_OPEN_SLFS_FILES];
+static struct sl_file_size_hint s_sl_file_size_hints[MAX_OPEN_SLFS_FILES];
+
+static int sl_fs_to_errno(_i32 r) {
+  DBG(("SL error: %d", (int) r));
+  switch (r) {
+    case SL_FS_OK:
+      return 0;
+    case SL_FS_FILE_NAME_EXIST:
+      return EEXIST;
+    case SL_FS_WRONG_FILE_NAME:
+      return EINVAL;
+    case SL_FS_ERR_NO_AVAILABLE_NV_INDEX:
+    case SL_FS_ERR_NO_AVAILABLE_BLOCKS:
+      return ENOSPC;
+    case SL_FS_ERR_FAILED_TO_ALLOCATE_MEM:
+      return ENOMEM;
+    case SL_FS_ERR_FILE_NOT_EXISTS:
+      return ENOENT;
+    case SL_FS_ERR_NOT_SUPPORTED:
+      return ENOTSUP;
+  }
+  return ENXIO;
+}
+
+int fs_slfs_open(const char *pathname, int flags, mode_t mode) {
+  int fd;
+  for (fd = 0; fd < MAX_OPEN_SLFS_FILES; fd++) {
+    if (s_sl_fds[fd].fh <= 0) break;
+  }
+  if (fd >= MAX_OPEN_SLFS_FILES) return set_errno(ENOMEM);
+  struct sl_fd_info *fi = &s_sl_fds[fd];
+
+  /*
+   * Apply path manipulations again, in case we got here directly
+   * (via TI libc's "add_device").
+   */
+  pathname = drop_dir(pathname, NULL);
+
+  _u32 am = 0;
+  fi->size = (size_t) -1;
+  int rw = (flags & 3);
+  if (rw == O_RDONLY) {
+    SlFsFileInfo_t sl_fi;
+    _i32 r = sl_FsGetInfo((const _u8 *) pathname, 0, &sl_fi);
+    if (r == SL_FS_OK) {
+      fi->size = sl_fi.FileLen;
+    }
+    am = FS_MODE_OPEN_READ;
+  } else {
+    if (!(flags & O_TRUNC) || (flags & O_APPEND)) {
+      // FailFS files cannot be opened for append and will be truncated
+      // when opened for write.
+      return set_errno(ENOTSUP);
+    }
+    if (flags & O_CREAT) {
+      size_t i, size = FS_SLFS_MAX_FILE_SIZE;
+      for (i = 0; i < MAX_OPEN_SLFS_FILES; i++) {
+        if (s_sl_file_size_hints[i].name != NULL &&
+            strcmp(s_sl_file_size_hints[i].name, pathname) == 0) {
+          size = s_sl_file_size_hints[i].size;
+          MG_FREE(s_sl_file_size_hints[i].name);
+          s_sl_file_size_hints[i].name = NULL;
+          break;
+        }
+      }
+      DBG(("creating %s with max size %d", pathname, (int) size));
+      am = FS_MODE_OPEN_CREATE(size, 0);
+    } else {
+      am = FS_MODE_OPEN_WRITE;
+    }
+  }
+  _i32 r = sl_FsOpen((_u8 *) pathname, am, NULL, &fi->fh);
+  DBG(("sl_FsOpen(%s, 0x%x) = %d, %d", pathname, (int) am, (int) r,
+       (int) fi->fh));
+  if (r == SL_FS_OK) {
+    fi->pos = 0;
+    r = fd;
+  } else {
+    fi->fh = -1;
+    r = set_errno(sl_fs_to_errno(r));
+  }
+  return r;
+}
+
+int fs_slfs_close(int fd) {
+  struct sl_fd_info *fi = &s_sl_fds[fd];
+  if (fi->fh <= 0) return set_errno(EBADF);
+  _i32 r = sl_FsClose(fi->fh, NULL, NULL, 0);
+  DBG(("sl_FsClose(%d) = %d", (int) fi->fh, (int) r));
+  s_sl_fds[fd].fh = -1;
+  return set_errno(sl_fs_to_errno(r));
+}
+
+ssize_t fs_slfs_read(int fd, void *buf, size_t count) {
+  struct sl_fd_info *fi = &s_sl_fds[fd];
+  if (fi->fh <= 0) return set_errno(EBADF);
+  /* Simulate EOF. sl_FsRead @ file_size return SL_FS_ERR_OFFSET_OUT_OF_RANGE.
+   */
+  if (fi->pos == fi->size) return 0;
+  _i32 r = sl_FsRead(fi->fh, fi->pos, buf, count);
+  DBG(("sl_FsRead(%d, %d, %d) = %d", (int) fi->fh, (int) fi->pos, (int) count,
+       (int) r));
+  if (r >= 0) {
+    fi->pos += r;
+    return r;
+  }
+  return set_errno(sl_fs_to_errno(r));
+}
+
+ssize_t fs_slfs_write(int fd, const void *buf, size_t count) {
+  struct sl_fd_info *fi = &s_sl_fds[fd];
+  if (fi->fh <= 0) return set_errno(EBADF);
+  _i32 r = sl_FsWrite(fi->fh, fi->pos, (_u8 *) buf, count);
+  DBG(("sl_FsWrite(%d, %d, %d) = %d", (int) fi->fh, (int) fi->pos, (int) count,
+       (int) r));
+  if (r >= 0) {
+    fi->pos += r;
+    return r;
+  }
+  return set_errno(sl_fs_to_errno(r));
+}
+
+int fs_slfs_stat(const char *pathname, struct stat *s) {
+  SlFsFileInfo_t sl_fi;
+  /*
+   * Apply path manipulations again, in case we got here directly
+   * (via TI libc's "add_device").
+   */
+  pathname = drop_dir(pathname, NULL);
+  _i32 r = sl_FsGetInfo((const _u8 *) pathname, 0, &sl_fi);
+  if (r == SL_FS_OK) {
+    s->st_mode = S_IFREG | 0666;
+    s->st_nlink = 1;
+    s->st_size = sl_fi.FileLen;
+    return 0;
+  }
+  return set_errno(sl_fs_to_errno(r));
+}
+
+int fs_slfs_fstat(int fd, struct stat *s) {
+  struct sl_fd_info *fi = &s_sl_fds[fd];
+  if (fi->fh <= 0) return set_errno(EBADF);
+  s->st_mode = 0666;
+  s->st_mode = S_IFREG | 0666;
+  s->st_nlink = 1;
+  s->st_size = fi->size;
+  return 0;
+}
+
+off_t fs_slfs_lseek(int fd, off_t offset, int whence) {
+  if (s_sl_fds[fd].fh <= 0) return set_errno(EBADF);
+  switch (whence) {
+    case SEEK_SET:
+      s_sl_fds[fd].pos = offset;
+      break;
+    case SEEK_CUR:
+      s_sl_fds[fd].pos += offset;
+      break;
+    case SEEK_END:
+      return set_errno(ENOTSUP);
+  }
+  return 0;
+}
+
+int fs_slfs_unlink(const char *pathname) {
+  /*
+   * Apply path manipulations again, in case we got here directly
+   * (via TI libc's "add_device").
+   */
+  pathname = drop_dir(pathname, NULL);
+  return set_errno(sl_fs_to_errno(sl_FsDel((const _u8 *) pathname, 0)));
+}
+
+int fs_slfs_rename(const char *from, const char *to) {
+  return set_errno(ENOTSUP);
+}
+
+void fs_slfs_set_new_file_size(const char *name, size_t size) {
+  int i;
+  for (i = 0; i < MAX_OPEN_SLFS_FILES; i++) {
+    if (s_sl_file_size_hints[i].name == NULL) {
+      DBG(("File size hint: %s %d", name, (int) size));
+      s_sl_file_size_hints[i].name = MG_STRDUP(name);
+      s_sl_file_size_hints[i].size = size;
+      break;
+    }
+  }
+}
+
+#endif /* defined(MG_FS_SLFS) || defined(CC3200_FS_SLFS) */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/simplelink/sl_fs.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_NET_IF == MG_NET_IF_SIMPLELINK && \
+    (defined(MG_FS_SLFS) || defined(MG_FS_SPIFFS))
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef __TI_COMPILER_VERSION__
+#include <file.h>
+#endif
+
+/* Amalgamated: #include "common/cs_dbg.h" */
+/* Amalgamated: #include "common/platform.h" */
+
+#ifdef CC3200_FS_SPIFFS
+/* Amalgamated: #include "cc3200_fs_spiffs.h" */
+#endif
+
+#ifdef MG_FS_SLFS
+/* Amalgamated: #include "sl_fs_slfs.h" */
+#endif
+
+#define NUM_SYS_FDS 3
+#define SPIFFS_FD_BASE 10
+#define SLFS_FD_BASE 100
+
+#ifndef MG_UART_CHAR_PUT
+#if CS_PLATFORM == CS_P_CC3200
+#include <inc/hw_types.h>
+#include <inc/hw_memmap.h>
+#include <driverlib/rom.h>
+#include <driverlib/rom_map.h>
+#include <driverlib/uart.h>
+#define MG_UART_CHAR_PUT(fd, c) MAP_UARTCharPut(UARTA0_BASE, c);
+#else
+#define MG_UART_CHAR_PUT(fd, c)
+#endif /* CS_PLATFORM == CS_P_CC3200 */
+#endif /* !MG_UART_CHAR_PUT */
+
+int set_errno(int e) {
+  errno = e;
+  return (e == 0 ? 0 : -1);
+}
+
+static const char *drop_dir(const char *fname, bool *is_slfs) {
+  if (is_slfs != NULL) {
+    *is_slfs = (strncmp(fname, "SL:", 3) == 0);
+    if (*is_slfs) fname += 3;
+  }
+  /* Drop "./", if any */
+  if (fname[0] == '.' && fname[1] == '/') {
+    fname += 2;
+  }
+  /*
+   * Drop / if it is the only one in the path.
+   * This allows use of /pretend/directories but serves /file.txt as normal.
+   */
+  if (fname[0] == '/' && strchr(fname + 1, '/') == NULL) {
+    fname++;
+  }
+  return fname;
+}
+
+enum fd_type {
+  FD_INVALID,
+  FD_SYS,
+#ifdef CC3200_FS_SPIFFS
+  FD_SPIFFS,
+#endif
+#ifdef MG_FS_SLFS
+  FD_SLFS
+#endif
+};
+static int fd_type(int fd) {
+  if (fd >= 0 && fd < NUM_SYS_FDS) return FD_SYS;
+#ifdef CC3200_FS_SPIFFS
+  if (fd >= SPIFFS_FD_BASE && fd < SPIFFS_FD_BASE + MAX_OPEN_SPIFFS_FILES) {
+    return FD_SPIFFS;
+  }
+#endif
+#ifdef MG_FS_SLFS
+  if (fd >= SLFS_FD_BASE && fd < SLFS_FD_BASE + MAX_OPEN_SLFS_FILES) {
+    return FD_SLFS;
+  }
+#endif
+  return FD_INVALID;
+}
+
+#if MG_TI_NO_HOST_INTERFACE
+int open(const char *pathname, unsigned flags, int mode) {
+#else
+int _open(const char *pathname, int flags, mode_t mode) {
+#endif
+  int fd = -1;
+  bool is_sl;
+  const char *fname = drop_dir(pathname, &is_sl);
+  if (is_sl) {
+#ifdef MG_FS_SLFS
+    fd = fs_slfs_open(fname, flags, mode);
+    if (fd >= 0) fd += SLFS_FD_BASE;
+#endif
+  } else {
+#ifdef CC3200_FS_SPIFFS
+    fd = fs_spiffs_open(fname, flags, mode);
+    if (fd >= 0) fd += SPIFFS_FD_BASE;
+#endif
+  }
+  LOG(LL_DEBUG,
+      ("open(%s, 0x%x) = %d, fname = %s", pathname, flags, fd, fname));
+  return fd;
+}
+
+int _stat(const char *pathname, struct stat *st) {
+  int res = -1;
+  bool is_sl;
+  const char *fname = drop_dir(pathname, &is_sl);
+  memset(st, 0, sizeof(*st));
+  /* Simulate statting the root directory. */
+  if (fname[0] == '\0' || strcmp(fname, ".") == 0) {
+    st->st_ino = 0;
+    st->st_mode = S_IFDIR | 0777;
+    st->st_nlink = 1;
+    st->st_size = 0;
+    return 0;
+  }
+  if (is_sl) {
+#ifdef MG_FS_SLFS
+    res = fs_slfs_stat(fname, st);
+#endif
+  } else {
+#ifdef CC3200_FS_SPIFFS
+    res = fs_spiffs_stat(fname, st);
+#endif
+  }
+  LOG(LL_DEBUG, ("stat(%s) = %d; fname = %s", pathname, res, fname));
+  return res;
+}
+
+#if MG_TI_NO_HOST_INTERFACE
+int close(int fd) {
+#else
+int _close(int fd) {
+#endif
+  int r = -1;
+  switch (fd_type(fd)) {
+    case FD_INVALID:
+      r = set_errno(EBADF);
+      break;
+    case FD_SYS:
+      r = set_errno(EACCES);
+      break;
+#ifdef CC3200_FS_SPIFFS
+    case FD_SPIFFS:
+      r = fs_spiffs_close(fd - SPIFFS_FD_BASE);
+      break;
+#endif
+#ifdef MG_FS_SLFS
+    case FD_SLFS:
+      r = fs_slfs_close(fd - SLFS_FD_BASE);
+      break;
+#endif
+  }
+  DBG(("close(%d) = %d", fd, r));
+  return r;
+}
+
+#if MG_TI_NO_HOST_INTERFACE
+off_t lseek(int fd, off_t offset, int whence) {
+#else
+off_t _lseek(int fd, off_t offset, int whence) {
+#endif
+  int r = -1;
+  switch (fd_type(fd)) {
+    case FD_INVALID:
+      r = set_errno(EBADF);
+      break;
+    case FD_SYS:
+      r = set_errno(ESPIPE);
+      break;
+#ifdef CC3200_FS_SPIFFS
+    case FD_SPIFFS:
+      r = fs_spiffs_lseek(fd - SPIFFS_FD_BASE, offset, whence);
+      break;
+#endif
+#ifdef MG_FS_SLFS
+    case FD_SLFS:
+      r = fs_slfs_lseek(fd - SLFS_FD_BASE, offset, whence);
+      break;
+#endif
+  }
+  DBG(("lseek(%d, %d, %d) = %d", fd, (int) offset, whence, r));
+  return r;
+}
+
+int _fstat(int fd, struct stat *s) {
+  int r = -1;
+  memset(s, 0, sizeof(*s));
+  switch (fd_type(fd)) {
+    case FD_INVALID:
+      r = set_errno(EBADF);
+      break;
+    case FD_SYS: {
+      /* Create barely passable stats for STD{IN,OUT,ERR}. */
+      memset(s, 0, sizeof(*s));
+      s->st_ino = fd;
+      s->st_mode = S_IFCHR | 0666;
+      r = 0;
+      break;
+    }
+#ifdef CC3200_FS_SPIFFS
+    case FD_SPIFFS:
+      r = fs_spiffs_fstat(fd - SPIFFS_FD_BASE, s);
+      break;
+#endif
+#ifdef MG_FS_SLFS
+    case FD_SLFS:
+      r = fs_slfs_fstat(fd - SLFS_FD_BASE, s);
+      break;
+#endif
+  }
+  DBG(("fstat(%d) = %d", fd, r));
+  return r;
+}
+
+#if MG_TI_NO_HOST_INTERFACE
+int read(int fd, char *buf, unsigned count) {
+#else
+ssize_t _read(int fd, void *buf, size_t count) {
+#endif
+  int r = -1;
+  switch (fd_type(fd)) {
+    case FD_INVALID:
+      r = set_errno(EBADF);
+      break;
+    case FD_SYS: {
+      if (fd != 0) {
+        r = set_errno(EACCES);
+        break;
+      }
+      /* Should we allow reading from stdin = uart? */
+      r = set_errno(ENOTSUP);
+      break;
+    }
+#ifdef CC3200_FS_SPIFFS
+    case FD_SPIFFS:
+      r = fs_spiffs_read(fd - SPIFFS_FD_BASE, buf, count);
+      break;
+#endif
+#ifdef MG_FS_SLFS
+    case FD_SLFS:
+      r = fs_slfs_read(fd - SLFS_FD_BASE, buf, count);
+      break;
+#endif
+  }
+  DBG(("read(%d, %u) = %d", fd, count, r));
+  return r;
+}
+
+#if MG_TI_NO_HOST_INTERFACE
+int write(int fd, const char *buf, unsigned count) {
+#else
+ssize_t _write(int fd, const void *buf, size_t count) {
+#endif
+  int r = -1;
+  size_t i = 0;
+  switch (fd_type(fd)) {
+    case FD_INVALID:
+      r = set_errno(EBADF);
+      break;
+    case FD_SYS: {
+      if (fd == 0) {
+        r = set_errno(EACCES);
+        break;
+      }
+      for (i = 0; i < count; i++) {
+        const char c = ((const char *) buf)[i];
+        if (c == '\n') MG_UART_CHAR_PUT(fd, '\r');
+        MG_UART_CHAR_PUT(fd, c);
+      }
+      r = count;
+      break;
+    }
+#ifdef CC3200_FS_SPIFFS
+    case FD_SPIFFS:
+      r = fs_spiffs_write(fd - SPIFFS_FD_BASE, buf, count);
+      break;
+#endif
+#ifdef MG_FS_SLFS
+    case FD_SLFS:
+      r = fs_slfs_write(fd - SLFS_FD_BASE, buf, count);
+      break;
+#endif
+  }
+  return r;
+}
+
+/*
+ * On Newlib we override rename directly too, because the default
+ * implementation using _link and _unlink doesn't work for us.
+ */
+#if MG_TI_NO_HOST_INTERFACE || defined(_NEWLIB_VERSION)
+int rename(const char *frompath, const char *topath) {
+  int r = -1;
+  bool is_sl_from, is_sl_to;
+  const char *from = drop_dir(frompath, &is_sl_from);
+  const char *to = drop_dir(topath, &is_sl_to);
+  if (is_sl_from || is_sl_to) {
+    set_errno(ENOTSUP);
+  } else {
+#ifdef CC3200_FS_SPIFFS
+    r = fs_spiffs_rename(from, to);
+#endif
+  }
+  DBG(("rename(%s, %s) = %d", from, to, r));
+  return r;
+}
+#endif /* MG_TI_NO_HOST_INTERFACE || defined(_NEWLIB_VERSION) */
+
+#if MG_TI_NO_HOST_INTERFACE
+int unlink(const char *pathname) {
+#else
+int _unlink(const char *pathname) {
+#endif
+  int r = -1;
+  bool is_sl;
+  const char *fname = drop_dir(pathname, &is_sl);
+  if (is_sl) {
+#ifdef MG_FS_SLFS
+    r = fs_slfs_unlink(fname);
+#endif
+  } else {
+#ifdef CC3200_FS_SPIFFS
+    r = fs_spiffs_unlink(fname);
+#endif
+  }
+  DBG(("unlink(%s) = %d, fname = %s", pathname, r, fname));
+  return r;
+}
+
+#ifdef CC3200_FS_SPIFFS /* FailFS does not support listing files. */
+DIR *opendir(const char *dir_name) {
+  DIR *r = NULL;
+  bool is_sl;
+  drop_dir(dir_name, &is_sl);
+  if (is_sl) {
+    r = NULL;
+    set_errno(ENOTSUP);
+  } else {
+    r = fs_spiffs_opendir(dir_name);
+  }
+  DBG(("opendir(%s) = %p", dir_name, r));
+  return r;
+}
+
+struct dirent *readdir(DIR *dir) {
+  struct dirent *res = fs_spiffs_readdir(dir);
+  DBG(("readdir(%p) = %p", dir, res));
+  return res;
+}
+
+int closedir(DIR *dir) {
+  int res = fs_spiffs_closedir(dir);
+  DBG(("closedir(%p) = %d", dir, res));
+  return res;
+}
+
+int rmdir(const char *path) {
+  return fs_spiffs_rmdir(path);
+}
+
+int mkdir(const char *path, mode_t mode) {
+  (void) path;
+  (void) mode;
+  /* for spiffs supports only root dir, which comes from mongoose as '.' */
+  return (strlen(path) == 1 && *path == '.') ? 0 : ENOTDIR;
+}
+#endif
+
+int sl_fs_init(void) {
+  int ret = 1;
+#ifdef __TI_COMPILER_VERSION__
+#ifdef MG_FS_SLFS
+#pragma diag_push
+#pragma diag_suppress 169 /* Nothing we can do about the prototype mismatch. \
+                             */
+  ret = (add_device("SL", _MSA, fs_slfs_open, fs_slfs_close, fs_slfs_read,
+                    fs_slfs_write, fs_slfs_lseek, fs_slfs_unlink,
+                    fs_slfs_rename) == 0);
+#pragma diag_pop
+#endif
+#endif
+  return ret;
+}
+
+#endif /* MG_NET_IF == MG_NET_IF_SIMPLELINK && (defined(MG_FS_SLFS) || \
+          defined(MG_FS_SPIFFS)) */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/simplelink/sl_socket.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_NET_IF == MG_NET_IF_SIMPLELINK
+
+#include <errno.h>
+#include <stdio.h>
+
+/* Amalgamated: #include "common/platform.h" */
+
+const char *inet_ntop(int af, const void *src, char *dst, socklen_t size) {
+  int res;
+  struct in_addr *in = (struct in_addr *) src;
+  if (af != AF_INET) {
+    errno = EAFNOSUPPORT;
+    return NULL;
+  }
+  res = snprintf(dst, size, "%lu.%lu.%lu.%lu", SL_IPV4_BYTE(in->s_addr, 0),
+                 SL_IPV4_BYTE(in->s_addr, 1), SL_IPV4_BYTE(in->s_addr, 2),
+                 SL_IPV4_BYTE(in->s_addr, 3));
+  return res > 0 ? dst : NULL;
+}
+
+char *inet_ntoa(struct in_addr n) {
+  static char a[16];
+  return (char *) inet_ntop(AF_INET, &n, a, sizeof(a));
+}
+
+int inet_pton(int af, const char *src, void *dst) {
+  uint32_t a0, a1, a2, a3;
+  uint8_t *db = (uint8_t *) dst;
+  if (af != AF_INET) {
+    errno = EAFNOSUPPORT;
+    return 0;
+  }
+  if (sscanf(src, "%lu.%lu.%lu.%lu", &a0, &a1, &a2, &a3) != 4) {
+    return 0;
+  }
+  *db = a3;
+  *(db + 1) = a2;
+  *(db + 2) = a1;
+  *(db + 3) = a0;
+  return 1;
+}
+
+#endif /* MG_NET_IF == MG_NET_IF_SIMPLELINK */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/simplelink/sl_mg_task.c"
+#endif
+#if MG_NET_IF == MG_NET_IF_SIMPLELINK && !defined(MG_SIMPLELINK_NO_OSI)
+
+/* Amalgamated: #include "mg_task.h" */
+
+#include <oslib/osi.h>
+
+enum mg_q_msg_type {
+  MG_Q_MSG_CB,
+};
+struct mg_q_msg {
+  enum mg_q_msg_type type;
+  void (*cb)(struct mg_mgr *mgr, void *arg);
+  void *arg;
+};
+static OsiMsgQ_t s_mg_q;
+static void mg_task(void *arg);
+
+bool mg_start_task(int priority, int stack_size, mg_init_cb mg_init) {
+  if (osi_MsgQCreate(&s_mg_q, "MG", sizeof(struct mg_q_msg), 16) != OSI_OK) {
+    return false;
+  }
+  if (osi_TaskCreate(mg_task, (const signed char *) "MG", stack_size,
+                     (void *) mg_init, priority, NULL) != OSI_OK) {
+    return false;
+  }
+  return true;
+}
+
+static void mg_task(void *arg) {
+  struct mg_mgr mgr;
+  mg_init_cb mg_init = (mg_init_cb) arg;
+  mg_mgr_init(&mgr, NULL);
+  mg_init(&mgr);
+  while (1) {
+    struct mg_q_msg msg;
+    mg_mgr_poll(&mgr, 1);
+    if (osi_MsgQRead(&s_mg_q, &msg, 1) != OSI_OK) continue;
+    switch (msg.type) {
+      case MG_Q_MSG_CB: {
+        msg.cb(&mgr, msg.arg);
+      }
+    }
+  }
+}
+
+void mg_run_in_task(void (*cb)(struct mg_mgr *mgr, void *arg), void *cb_arg) {
+  struct mg_q_msg msg = {MG_Q_MSG_CB, cb, cb_arg};
+  osi_MsgQWrite(&s_mg_q, &msg, OSI_NO_WAIT);
+}
+
+#endif /* MG_NET_IF == MG_NET_IF_SIMPLELINK && !defined(MG_SIMPLELINK_NO_OSI) \
+          */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/simplelink/sl_net_if.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_SIMPLELINK_SL_NET_IF_H_
+#define CS_COMMON_PLATFORMS_SIMPLELINK_SL_NET_IF_H_
+
+/* Amalgamated: #include "mongoose/src/net_if.h" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#ifndef MG_ENABLE_NET_IF_SIMPLELINK
+#define MG_ENABLE_NET_IF_SIMPLELINK MG_NET_IF == MG_NET_IF_SIMPLELINK
+#endif
+
+extern struct mg_iface_vtable mg_simplelink_iface_vtable;
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* CS_COMMON_PLATFORMS_SIMPLELINK_SL_NET_IF_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/simplelink/sl_net_if.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/* Amalgamated: #include "common/platforms/simplelink/sl_net_if.h" */
+
+#if MG_ENABLE_NET_IF_SIMPLELINK
+
+/* Amalgamated: #include "mongoose/src/internal.h" */
+/* Amalgamated: #include "mongoose/src/util.h" */
+
+#define MG_TCP_RECV_BUFFER_SIZE 1024
+#define MG_UDP_RECV_BUFFER_SIZE 1500
+
+static sock_t mg_open_listening_socket(union socket_address *sa, int type,
+                                       int proto);
+
+int sl_set_ssl_opts(struct mg_connection *nc);
+
+void mg_set_non_blocking_mode(sock_t sock) {
+  SlSockNonblocking_t opt;
+  opt.NonblockingEnabled = 1;
+  sl_SetSockOpt(sock, SL_SOL_SOCKET, SL_SO_NONBLOCKING, &opt, sizeof(opt));
+}
+
+static int mg_is_error(int n) {
+  return (n < 0 && n != SL_EALREADY && n != SL_EAGAIN);
+}
+
+void mg_sl_if_connect_tcp(struct mg_connection *nc,
+                          const union socket_address *sa) {
+  int proto = 0;
+  if (nc->flags & MG_F_SSL) proto = SL_SEC_SOCKET;
+  sock_t sock = sl_Socket(AF_INET, SOCK_STREAM, proto);
+  if (sock < 0) {
+    nc->err = sock;
+    goto out;
+  }
+  mg_sock_set(nc, sock);
+#if MG_ENABLE_SSL
+  nc->err = sl_set_ssl_opts(nc);
+  if (nc->err != 0) goto out;
+#endif
+  nc->err = sl_Connect(sock, &sa->sa, sizeof(sa->sin));
+out:
+  DBG(("%p to %s:%d sock %d %d err %d", nc, inet_ntoa(sa->sin.sin_addr),
+       ntohs(sa->sin.sin_port), nc->sock, proto, nc->err));
+}
+
+void mg_sl_if_connect_udp(struct mg_connection *nc) {
+  sock_t sock = sl_Socket(AF_INET, SOCK_DGRAM, 0);
+  if (sock < 0) {
+    nc->err = sock;
+    return;
+  }
+  mg_sock_set(nc, sock);
+  nc->err = 0;
+}
+
+int mg_sl_if_listen_tcp(struct mg_connection *nc, union socket_address *sa) {
+  int proto = 0;
+  if (nc->flags & MG_F_SSL) proto = SL_SEC_SOCKET;
+  sock_t sock = mg_open_listening_socket(sa, SOCK_STREAM, proto);
+  if (sock < 0) return sock;
+  mg_sock_set(nc, sock);
+#if MG_ENABLE_SSL
+  return sl_set_ssl_opts(nc);
+#else
+  return 0;
+#endif
+}
+
+int mg_sl_if_listen_udp(struct mg_connection *nc, union socket_address *sa) {
+  sock_t sock = mg_open_listening_socket(sa, SOCK_DGRAM, 0);
+  if (sock == INVALID_SOCKET) return (errno ? errno : 1);
+  mg_sock_set(nc, sock);
+  return 0;
+}
+
+void mg_sl_if_tcp_send(struct mg_connection *nc, const void *buf, size_t len) {
+  mbuf_append(&nc->send_mbuf, buf, len);
+}
+
+void mg_sl_if_udp_send(struct mg_connection *nc, const void *buf, size_t len) {
+  mbuf_append(&nc->send_mbuf, buf, len);
+}
+
+void mg_sl_if_recved(struct mg_connection *nc, size_t len) {
+  (void) nc;
+  (void) len;
+}
+
+int mg_sl_if_create_conn(struct mg_connection *nc) {
+  (void) nc;
+  return 1;
+}
+
+void mg_sl_if_destroy_conn(struct mg_connection *nc) {
+  if (nc->sock == INVALID_SOCKET) return;
+  /* For UDP, only close outgoing sockets or listeners. */
+  if (!(nc->flags & MG_F_UDP) || nc->listener == NULL) {
+    sl_Close(nc->sock);
+  }
+  nc->sock = INVALID_SOCKET;
+}
+
+static int mg_accept_conn(struct mg_connection *lc) {
+  struct mg_connection *nc;
+  union socket_address sa;
+  socklen_t sa_len = sizeof(sa);
+  sock_t sock = sl_Accept(lc->sock, &sa.sa, &sa_len);
+  if (sock < 0) {
+    DBG(("%p: failed to accept: %d", lc, sock));
+    return 0;
+  }
+  nc = mg_if_accept_new_conn(lc);
+  if (nc == NULL) {
+    sl_Close(sock);
+    return 0;
+  }
+  DBG(("%p conn from %s:%d", nc, inet_ntoa(sa.sin.sin_addr),
+       ntohs(sa.sin.sin_port)));
+  mg_sock_set(nc, sock);
+  if (nc->flags & MG_F_SSL) nc->flags |= MG_F_SSL_HANDSHAKE_DONE;
+  mg_if_accept_tcp_cb(nc, &sa, sa_len);
+  return 1;
+}
+
+/* 'sa' must be an initialized address to bind to */
+static sock_t mg_open_listening_socket(union socket_address *sa, int type,
+                                       int proto) {
+  int r;
+  socklen_t sa_len =
+      (sa->sa.sa_family == AF_INET) ? sizeof(sa->sin) : sizeof(sa->sin6);
+  sock_t sock = sl_Socket(sa->sa.sa_family, type, proto);
+  if (sock < 0) return sock;
+  if ((r = sl_Bind(sock, &sa->sa, sa_len)) < 0) {
+    sl_Close(sock);
+    return r;
+  }
+  if (type != SOCK_DGRAM && (r = sl_Listen(sock, SOMAXCONN)) < 0) {
+    sl_Close(sock);
+    return r;
+  }
+  mg_set_non_blocking_mode(sock);
+  return sock;
+}
+
+static void mg_write_to_socket(struct mg_connection *nc) {
+  struct mbuf *io = &nc->send_mbuf;
+  int n = 0;
+
+  if (nc->flags & MG_F_UDP) {
+    n = sl_SendTo(nc->sock, io->buf, io->len, 0, &nc->sa.sa,
+                  sizeof(nc->sa.sin));
+    DBG(("%p %d %d %d %s:%hu", nc, nc->sock, n, errno,
+         inet_ntoa(nc->sa.sin.sin_addr), ntohs(nc->sa.sin.sin_port)));
+  } else {
+    n = (int) sl_Send(nc->sock, io->buf, io->len, 0);
+    DBG(("%p %d bytes -> %d", nc, n, nc->sock));
+  }
+
+  if (n > 0) {
+    mbuf_remove(io, n);
+    mg_if_sent_cb(nc, n);
+  } else if (n < 0 && mg_is_error(n)) {
+    /* Something went wrong, drop the connection. */
+    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+  }
+}
+
+MG_INTERNAL size_t recv_avail_size(struct mg_connection *conn, size_t max) {
+  size_t avail;
+  if (conn->recv_mbuf_limit < conn->recv_mbuf.len) return 0;
+  avail = conn->recv_mbuf_limit - conn->recv_mbuf.len;
+  return avail > max ? max : avail;
+}
+
+static void mg_handle_tcp_read(struct mg_connection *conn) {
+  int n = 0;
+  char *buf = (char *) MG_MALLOC(MG_TCP_RECV_BUFFER_SIZE);
+
+  if (buf == NULL) {
+    DBG(("OOM"));
+    return;
+  }
+
+  n = (int) sl_Recv(conn->sock, buf,
+                    recv_avail_size(conn, MG_TCP_RECV_BUFFER_SIZE), 0);
+  DBG(("%p %d bytes <- %d", conn, n, conn->sock));
+  if (n > 0) {
+    mg_if_recv_tcp_cb(conn, buf, n, 1 /* own */);
+  } else {
+    MG_FREE(buf);
+  }
+  if (n == 0) {
+    /* Orderly shutdown of the socket, try flushing output. */
+    conn->flags |= MG_F_SEND_AND_CLOSE;
+  } else if (mg_is_error(n)) {
+    conn->flags |= MG_F_CLOSE_IMMEDIATELY;
+  }
+}
+
+static void mg_handle_udp_read(struct mg_connection *nc) {
+  char *buf = (char *) MG_MALLOC(MG_UDP_RECV_BUFFER_SIZE);
+  if (buf == NULL) return;
+  union socket_address sa;
+  socklen_t sa_len = sizeof(sa);
+  int n = sl_RecvFrom(nc->sock, buf, MG_UDP_RECV_BUFFER_SIZE, 0,
+                      (SlSockAddr_t *) &sa, &sa_len);
+  DBG(("%p %d bytes from %s:%d", nc, n, inet_ntoa(nc->sa.sin.sin_addr),
+       ntohs(nc->sa.sin.sin_port)));
+  if (n > 0) {
+    mg_if_recv_udp_cb(nc, buf, n, &sa, sa_len);
+  } else {
+    MG_FREE(buf);
+  }
+}
+
+#define _MG_F_FD_CAN_READ 1
+#define _MG_F_FD_CAN_WRITE 1 << 1
+#define _MG_F_FD_ERROR 1 << 2
+
+void mg_mgr_handle_conn(struct mg_connection *nc, int fd_flags, double now) {
+  DBG(("%p fd=%d fd_flags=%d nc_flags=%lu rmbl=%d smbl=%d", nc, nc->sock,
+       fd_flags, nc->flags, (int) nc->recv_mbuf.len, (int) nc->send_mbuf.len));
+
+  if (nc->flags & MG_F_CONNECTING) {
+    if (nc->flags & MG_F_UDP || nc->err != SL_EALREADY) {
+      mg_if_connect_cb(nc, nc->err);
+    } else {
+      /* In SimpleLink, to get status of non-blocking connect() we need to wait
+       * until socket is writable and repeat the call to sl_Connect again,
+       * which will now return the real status. */
+      if (fd_flags & _MG_F_FD_CAN_WRITE) {
+        nc->err = sl_Connect(nc->sock, &nc->sa.sa, sizeof(nc->sa.sin));
+        DBG(("%p conn res=%d", nc, nc->err));
+        if (nc->err == SL_ESECSNOVERIFY ||
+            /* TODO(rojer): Provide API to set the date for verification. */
+            nc->err == SL_ESECDATEERROR) {
+          nc->err = 0;
+        }
+        if (nc->flags & MG_F_SSL && nc->err == 0) {
+          nc->flags |= MG_F_SSL_HANDSHAKE_DONE;
+        }
+        mg_if_connect_cb(nc, nc->err);
+      }
+    }
+    /* Ignore read/write in further processing, we've handled it. */
+    fd_flags &= ~(_MG_F_FD_CAN_READ | _MG_F_FD_CAN_WRITE);
+  }
+
+  if (fd_flags & _MG_F_FD_CAN_READ) {
+    if (nc->flags & MG_F_UDP) {
+      mg_handle_udp_read(nc);
+    } else {
+      if (nc->flags & MG_F_LISTENING) {
+        mg_accept_conn(nc);
+      } else {
+        mg_handle_tcp_read(nc);
+      }
+    }
+  }
+
+  if (!(nc->flags & MG_F_CLOSE_IMMEDIATELY)) {
+    if ((fd_flags & _MG_F_FD_CAN_WRITE) && nc->send_mbuf.len > 0) {
+      mg_write_to_socket(nc);
+    }
+
+    if (!(fd_flags & (_MG_F_FD_CAN_READ | _MG_F_FD_CAN_WRITE))) {
+      mg_if_poll(nc, now);
+    }
+    mg_if_timer(nc, now);
+  }
+
+  DBG(("%p after fd=%d nc_flags=%lu rmbl=%d smbl=%d", nc, nc->sock, nc->flags,
+       (int) nc->recv_mbuf.len, (int) nc->send_mbuf.len));
+}
+
+/* Associate a socket to a connection. */
+void mg_sl_if_sock_set(struct mg_connection *nc, sock_t sock) {
+  mg_set_non_blocking_mode(sock);
+  nc->sock = sock;
+  DBG(("%p %d", nc, sock));
+}
+
+void mg_sl_if_init(struct mg_iface *iface) {
+  (void) iface;
+  DBG(("%p using sl_Select()", iface->mgr));
+}
+
+void mg_sl_if_free(struct mg_iface *iface) {
+  (void) iface;
+}
+
+void mg_sl_if_add_conn(struct mg_connection *nc) {
+  (void) nc;
+}
+
+void mg_sl_if_remove_conn(struct mg_connection *nc) {
+  (void) nc;
+}
+
+time_t mg_sl_if_poll(struct mg_iface *iface, int timeout_ms) {
+  struct mg_mgr *mgr = iface->mgr;
+  double now = mg_time();
+  double min_timer;
+  struct mg_connection *nc, *tmp;
+  struct SlTimeval_t tv;
+  SlFdSet_t read_set, write_set, err_set;
+  sock_t max_fd = INVALID_SOCKET;
+  int num_fds, num_ev = 0, num_timers = 0;
+
+  SL_FD_ZERO(&read_set);
+  SL_FD_ZERO(&write_set);
+  SL_FD_ZERO(&err_set);
+
+  /*
+   * Note: it is ok to have connections with sock == INVALID_SOCKET in the list,
+   * e.g. timer-only "connections".
+   */
+  min_timer = 0;
+  for (nc = mgr->active_connections, num_fds = 0; nc != NULL; nc = tmp) {
+    tmp = nc->next;
+
+    if (nc->sock != INVALID_SOCKET) {
+      num_fds++;
+
+      if (!(nc->flags & MG_F_WANT_WRITE) &&
+          nc->recv_mbuf.len < nc->recv_mbuf_limit &&
+          (!(nc->flags & MG_F_UDP) || nc->listener == NULL)) {
+        SL_FD_SET(nc->sock, &read_set);
+        if (max_fd == INVALID_SOCKET || nc->sock > max_fd) max_fd = nc->sock;
+      }
+
+      if (((nc->flags & MG_F_CONNECTING) && !(nc->flags & MG_F_WANT_READ)) ||
+          (nc->send_mbuf.len > 0 && !(nc->flags & MG_F_CONNECTING))) {
+        SL_FD_SET(nc->sock, &write_set);
+        SL_FD_SET(nc->sock, &err_set);
+        if (max_fd == INVALID_SOCKET || nc->sock > max_fd) max_fd = nc->sock;
+      }
+    }
+
+    if (nc->ev_timer_time > 0) {
+      if (num_timers == 0 || nc->ev_timer_time < min_timer) {
+        min_timer = nc->ev_timer_time;
+      }
+      num_timers++;
+    }
+  }
+
+  /*
+   * If there is a timer to be fired earlier than the requested timeout,
+   * adjust the timeout.
+   */
+  if (num_timers > 0) {
+    double timer_timeout_ms = (min_timer - mg_time()) * 1000 + 1 /* rounding */;
+    if (timer_timeout_ms < timeout_ms) {
+      timeout_ms = timer_timeout_ms;
+    }
+  }
+  if (timeout_ms < 0) timeout_ms = 0;
+
+  tv.tv_sec = timeout_ms / 1000;
+  tv.tv_usec = (timeout_ms % 1000) * 1000;
+
+  if (num_fds > 0) {
+    num_ev = sl_Select((int) max_fd + 1, &read_set, &write_set, &err_set, &tv);
+  }
+
+  now = mg_time();
+  DBG(("sl_Select @ %ld num_ev=%d of %d, timeout=%d", (long) now, num_ev,
+       num_fds, timeout_ms));
+
+  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
+    int fd_flags = 0;
+    if (nc->sock != INVALID_SOCKET) {
+      if (num_ev > 0) {
+        fd_flags =
+            (SL_FD_ISSET(nc->sock, &read_set) &&
+                     (!(nc->flags & MG_F_UDP) || nc->listener == NULL)
+                 ? _MG_F_FD_CAN_READ
+                 : 0) |
+            (SL_FD_ISSET(nc->sock, &write_set) ? _MG_F_FD_CAN_WRITE : 0) |
+            (SL_FD_ISSET(nc->sock, &err_set) ? _MG_F_FD_ERROR : 0);
+      }
+      /* SimpleLink does not report UDP sockets as writeable. */
+      if (nc->flags & MG_F_UDP && nc->send_mbuf.len > 0) {
+        fd_flags |= _MG_F_FD_CAN_WRITE;
+      }
+    }
+    tmp = nc->next;
+    mg_mgr_handle_conn(nc, fd_flags, now);
+  }
+
+  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
+    tmp = nc->next;
+    if ((nc->flags & MG_F_CLOSE_IMMEDIATELY) ||
+        (nc->send_mbuf.len == 0 && (nc->flags & MG_F_SEND_AND_CLOSE))) {
+      mg_close_conn(nc);
+    }
+  }
+
+  return now;
+}
+
+void mg_sl_if_get_conn_addr(struct mg_connection *nc, int remote,
+                            union socket_address *sa) {
+  /* SimpleLink does not provide a way to get socket's peer address after
+   * accept or connect. Address hould have been preserved in the connection,
+   * so we do our best here by using it. */
+  if (remote) memcpy(sa, &nc->sa, sizeof(*sa));
+}
+
+void sl_restart_cb(struct mg_mgr *mgr) {
+  /*
+   * SimpleLink has been restarted, meaning all sockets have been invalidated.
+   * We try our best - we'll restart the listeners, but for outgoing
+   * connections we have no option but to terminate.
+   */
+  struct mg_connection *nc;
+  for (nc = mg_next(mgr, NULL); nc != NULL; nc = mg_next(mgr, nc)) {
+    if (nc->sock == INVALID_SOCKET) continue; /* Could be a timer */
+    if (nc->flags & MG_F_LISTENING) {
+      DBG(("restarting %p %s:%d", nc, inet_ntoa(nc->sa.sin.sin_addr),
+           ntohs(nc->sa.sin.sin_port)));
+      int res = (nc->flags & MG_F_UDP ? mg_sl_if_listen_udp(nc, &nc->sa)
+                                      : mg_sl_if_listen_tcp(nc, &nc->sa));
+      if (res == 0) continue;
+      /* Well, we tried and failed. Fall through to closing. */
+    }
+    nc->sock = INVALID_SOCKET;
+    DBG(("terminating %p %s:%d", nc, inet_ntoa(nc->sa.sin.sin_addr),
+         ntohs(nc->sa.sin.sin_port)));
+    /* TODO(rojer): Outgoing UDP? */
+    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+  }
+}
+
+/* clang-format off */
+#define MG_SL_IFACE_VTABLE                                              \
+  {                                                                     \
+    mg_sl_if_init,                                                      \
+    mg_sl_if_free,                                                      \
+    mg_sl_if_add_conn,                                                  \
+    mg_sl_if_remove_conn,                                               \
+    mg_sl_if_poll,                                                      \
+    mg_sl_if_listen_tcp,                                                \
+    mg_sl_if_listen_udp,                                                \
+    mg_sl_if_connect_tcp,                                               \
+    mg_sl_if_connect_udp,                                               \
+    mg_sl_if_tcp_send,                                                  \
+    mg_sl_if_udp_send,                                                  \
+    mg_sl_if_recved,                                                    \
+    mg_sl_if_create_conn,                                               \
+    mg_sl_if_destroy_conn,                                              \
+    mg_sl_if_sock_set,                                                  \
+    mg_sl_if_get_conn_addr,                                             \
+  }
+/* clang-format on */
+
+struct mg_iface_vtable mg_simplelink_iface_vtable = MG_SL_IFACE_VTABLE;
+#if MG_NET_IF == MG_NET_IF_SIMPLELINK
+struct mg_iface_vtable mg_default_iface_vtable = MG_SL_IFACE_VTABLE;
+#endif
+
+#endif /* MG_ENABLE_NET_IF_SIMPLELINK */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/simplelink/sl_ssl_if.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_SIMPLELINK
+
+struct mg_ssl_if_ctx {
+  char *ssl_cert;
+  char *ssl_key;
+  char *ssl_ca_cert;
+  char *ssl_server_name;
+};
+
+void mg_ssl_if_init() {
+}
+
+enum mg_ssl_if_result mg_ssl_if_conn_init(
+    struct mg_connection *nc, const struct mg_ssl_if_conn_params *params,
+    const char **err_msg) {
+  struct mg_ssl_if_ctx *ctx =
+      (struct mg_ssl_if_ctx *) MG_CALLOC(1, sizeof(*ctx));
+  if (ctx == NULL) {
+    MG_SET_PTRPTR(err_msg, "Out of memory");
+    return MG_SSL_ERROR;
+  }
+  nc->ssl_if_data = ctx;
+
+  if (params->cert != NULL || params->key != NULL) {
+    if (params->cert != NULL && params->key != NULL) {
+      ctx->ssl_cert = MG_STRDUP(params->cert);
+      ctx->ssl_key = MG_STRDUP(params->key);
+    } else {
+      MG_SET_PTRPTR(err_msg, "Both cert and key are required.");
+      return MG_SSL_ERROR;
+    }
+  }
+  if (params->ca_cert != NULL && strcmp(params->ca_cert, "*") != 0) {
+    ctx->ssl_ca_cert = MG_STRDUP(params->ca_cert);
+  }
+  /* TODO(rojer): cipher_suites. */
+  if (params->server_name != NULL) {
+    ctx->ssl_server_name = MG_STRDUP(params->server_name);
+  }
+  return MG_SSL_OK;
+}
+
+void mg_ssl_if_conn_free(struct mg_connection *nc) {
+  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
+  if (ctx == NULL) return;
+  nc->ssl_if_data = NULL;
+  MG_FREE(ctx->ssl_cert);
+  MG_FREE(ctx->ssl_key);
+  MG_FREE(ctx->ssl_ca_cert);
+  MG_FREE(ctx->ssl_server_name);
+  memset(ctx, 0, sizeof(*ctx));
+  MG_FREE(ctx);
+}
+
+bool pem_to_der(const char *pem_file, const char *der_file) {
+  bool ret = false;
+  FILE *pf = NULL, *df = NULL;
+  bool writing = false;
+  pf = fopen(pem_file, "r");
+  if (pf == NULL) goto clean;
+  remove(der_file);
+  fs_slfs_set_new_file_size(der_file + 3, 2048);
+  df = fopen(der_file, "w");
+  if (df == NULL) goto clean;
+  while (1) {
+    char pem_buf[70];
+    char der_buf[48];
+    if (!fgets(pem_buf, sizeof(pem_buf), pf)) break;
+    if (writing) {
+      if (strstr(pem_buf, "-----END ") != NULL) {
+        ret = true;
+        break;
+      }
+      int l = 0;
+      while (!isspace((unsigned int) pem_buf[l])) l++;
+      int der_len = 0;
+      cs_base64_decode((const unsigned char *) pem_buf, sizeof(pem_buf),
+                       der_buf, &der_len);
+      if (der_len <= 0) break;
+      if (fwrite(der_buf, 1, der_len, df) != der_len) break;
+    } else if (strstr(pem_buf, "-----BEGIN ") != NULL) {
+      writing = true;
+    }
+  }
+
+clean:
+  if (pf != NULL) fclose(pf);
+  if (df != NULL) {
+    fclose(df);
+    if (!ret) remove(der_file);
+  }
+  return ret;
+}
+
+#if MG_ENABLE_FILESYSTEM && defined(MG_FS_SLFS)
+/* If the file's extension is .pem, convert it to DER format and put on SLFS. */
+static char *sl_pem2der(const char *pem_file) {
+  const char *pem_ext = strstr(pem_file, ".pem");
+  if (pem_ext == NULL || *(pem_ext + 4) != '\0') {
+    return MG_STRDUP(pem_file);
+  }
+  char *der_file = NULL;
+  /* DER file must be located on SLFS, add prefix. */
+  int l = mg_asprintf(&der_file, 0, "SL:%.*s.der", (int) (pem_ext - pem_file),
+                      pem_file);
+  if (der_file == NULL) return NULL;
+  bool result = false;
+  cs_stat_t st;
+  if (mg_stat(der_file, &st) != 0) {
+    result = pem_to_der(pem_file, der_file);
+    LOG(LL_DEBUG, ("%s -> %s = %d", pem_file, der_file, result));
+  } else {
+    /* File exists, assume it's already been converted. */
+    result = true;
+  }
+  if (result) {
+    /* Strip the SL: prefix we added since NWP does not expect it. */
+    memmove(der_file, der_file + 3, l - 2 /* including \0 */);
+  } else {
+    MG_FREE(der_file);
+    der_file = NULL;
+  }
+  return der_file;
+}
+#else
+static char *sl_pem2der(const char *pem_file) {
+  return MG_STRDUP(pem_file);
+}
+#endif
+
+int sl_set_ssl_opts(struct mg_connection *nc) {
+  int err;
+  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
+  DBG(("%p ssl ctx: %p", nc, ctx));
+
+  if (ctx != NULL) {
+    DBG(("%p %s,%s,%s,%s", nc, (ctx->ssl_cert ? ctx->ssl_cert : "-"),
+         (ctx->ssl_key ? ctx->ssl_cert : "-"),
+         (ctx->ssl_ca_cert ? ctx->ssl_ca_cert : "-"),
+         (ctx->ssl_server_name ? ctx->ssl_server_name : "-")));
+    if (ctx->ssl_cert != NULL && ctx->ssl_key != NULL) {
+      char *ssl_cert = sl_pem2der(ctx->ssl_cert);
+      char *ssl_key = sl_pem2der(ctx->ssl_key);
+      if (ssl_cert != NULL && ssl_key != NULL) {
+        err = sl_SetSockOpt(nc->sock, SL_SOL_SOCKET,
+                            SL_SO_SECURE_FILES_CERTIFICATE_FILE_NAME, ssl_cert,
+                            strlen(ssl_cert));
+        LOG(LL_INFO, ("CERTIFICATE_FILE_NAME %s -> %d", ssl_cert, err));
+        err = sl_SetSockOpt(nc->sock, SL_SOL_SOCKET,
+                            SL_SO_SECURE_FILES_PRIVATE_KEY_FILE_NAME, ssl_key,
+                            strlen(ssl_key));
+        LOG(LL_INFO, ("PRIVATE_KEY_FILE_NAME %s -> %d", ssl_key, err));
+      } else {
+        err = -1;
+      }
+      MG_FREE(ssl_cert);
+      MG_FREE(ssl_key);
+      if (err != 0) return err;
+    }
+    if (ctx->ssl_ca_cert != NULL) {
+      if (ctx->ssl_ca_cert[0] != '\0') {
+        char *ssl_ca_cert = sl_pem2der(ctx->ssl_ca_cert);
+        if (ssl_ca_cert != NULL) {
+          err = sl_SetSockOpt(nc->sock, SL_SOL_SOCKET,
+                              SL_SO_SECURE_FILES_CA_FILE_NAME, ssl_ca_cert,
+                              strlen(ssl_ca_cert));
+          LOG(LL_INFO, ("CA_FILE_NAME %s -> %d", ssl_ca_cert, err));
+        } else {
+          err = -1;
+        }
+        MG_FREE(ssl_ca_cert);
+        if (err != 0) return err;
+      }
+    }
+    if (ctx->ssl_server_name != NULL) {
+      err = sl_SetSockOpt(nc->sock, SL_SOL_SOCKET,
+                          SO_SECURE_DOMAIN_NAME_VERIFICATION,
+                          ctx->ssl_server_name, strlen(ctx->ssl_server_name));
+      DBG(("DOMAIN_NAME_VERIFICATION %s -> %d", ctx->ssl_server_name, err));
+      /* Domain name verificationw as added in a NWP service pack, older
+       * versions return SL_ENOPROTOOPT. There isn't much we can do about it,
+       * so we ignore the error. */
+      if (err != 0 && err != SL_ENOPROTOOPT) return err;
+    }
+  }
+  return 0;
+}
+
+#endif /* MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_SIMPLELINK */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/lwip/mg_lwip_net_if.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_LWIP_MG_NET_IF_LWIP_H_
+#define CS_COMMON_PLATFORMS_LWIP_MG_NET_IF_LWIP_H_
+
+#ifndef MG_ENABLE_NET_IF_LWIP_LOW_LEVEL
+#define MG_ENABLE_NET_IF_LWIP_LOW_LEVEL MG_NET_IF == MG_NET_IF_LWIP_LOW_LEVEL
+#endif
+
+#if MG_ENABLE_NET_IF_LWIP_LOW_LEVEL
+
+#include <stdint.h>
+
+extern struct mg_iface_vtable mg_lwip_iface_vtable;
+
+struct mg_lwip_conn_state {
+  struct mg_connection *nc;
+  struct mg_connection *lc;
+  union {
+    struct tcp_pcb *tcp;
+    struct udp_pcb *udp;
+  } pcb;
+  err_t err;
+  size_t num_sent; /* Number of acknowledged bytes to be reported to the core */
+  struct pbuf *rx_chain; /* Chain of incoming data segments. */
+  size_t rx_offset; /* Offset within the first pbuf (if partially consumed) */
+  /* Last SSL write size, for retries. */
+  int last_ssl_write_size;
+  /* Whether MG_SIG_RECV is already pending for this connection */
+  int recv_pending;
+};
+
+enum mg_sig_type {
+  MG_SIG_CONNECT_RESULT = 1,
+  MG_SIG_RECV = 2,
+  MG_SIG_SENT_CB = 3,
+  MG_SIG_CLOSE_CONN = 4,
+  MG_SIG_TOMBSTONE = 5,
+  MG_SIG_ACCEPT = 6,
+};
+
+void mg_lwip_post_signal(enum mg_sig_type sig, struct mg_connection *nc);
+
+/* To be implemented by the platform. */
+void mg_lwip_mgr_schedule_poll(struct mg_mgr *mgr);
+
+#endif /* MG_ENABLE_NET_IF_LWIP_LOW_LEVEL */
+
+#endif /* CS_COMMON_PLATFORMS_LWIP_MG_NET_IF_LWIP_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/lwip/mg_lwip_net_if.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_NET_IF_LWIP_LOW_LEVEL
+
+#include <lwip/pbuf.h>
+#include <lwip/tcp.h>
+#if CS_PLATFORM != CS_P_STM32
+#include <lwip/tcp_impl.h>
+#endif
+#include <lwip/udp.h>
+
+/* Amalgamated: #include "common/cs_dbg.h" */
+
+/*
+ * Depending on whether Mongoose is compiled with ipv6 support, use right
+ * lwip functions
+ */
+#if MG_ENABLE_IPV6
+#define TCP_NEW tcp_new_ip6
+#define TCP_BIND tcp_bind_ip6
+#define UDP_BIND udp_bind_ip6
+#define IPADDR_NTOA(x) ip6addr_ntoa((const ip6_addr_t *)(x))
+#define SET_ADDR(dst, src)                               \
+  memcpy((dst)->sin6.sin6_addr.s6_addr, (src)->ip6.addr, \
+         sizeof((dst)->sin6.sin6_addr.s6_addr))
+#else
+#define TCP_NEW tcp_new
+#define TCP_BIND tcp_bind
+#define UDP_BIND udp_bind
+#define IPADDR_NTOA ipaddr_ntoa
+#define SET_ADDR(dst, src) (dst)->sin.sin_addr.s_addr = GET_IPV4(src)
+#endif
+
+/*
+ * If lwip is compiled with ipv6 support, then API changes even for ipv4
+ */
+#if !defined(LWIP_IPV6) || !LWIP_IPV6
+#define GET_IPV4(ipX_addr) ((ipX_addr)->addr)
+#else
+#define GET_IPV4(ipX_addr) ((ipX_addr)->ip4.addr)
+#endif
+
+void mg_lwip_ssl_do_hs(struct mg_connection *nc);
+void mg_lwip_ssl_send(struct mg_connection *nc);
+void mg_lwip_ssl_recv(struct mg_connection *nc);
+
+void mg_lwip_if_init(struct mg_iface *iface);
+void mg_lwip_if_free(struct mg_iface *iface);
+void mg_lwip_if_add_conn(struct mg_connection *nc);
+void mg_lwip_if_remove_conn(struct mg_connection *nc);
+time_t mg_lwip_if_poll(struct mg_iface *iface, int timeout_ms);
+
+#ifdef RTOS_SDK
+extern void mgos_lock();
+extern void mgos_unlock();
+#else
+#define mgos_lock()
+#define mgos_unlock()
+#endif
+
+static void mg_lwip_recv_common(struct mg_connection *nc, struct pbuf *p);
+
+#if LWIP_TCP_KEEPALIVE
+void mg_lwip_set_keepalive_params(struct mg_connection *nc, int idle,
+                                  int interval, int count) {
+  if (nc->sock == INVALID_SOCKET || nc->flags & MG_F_UDP) {
+    return;
+  }
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  struct tcp_pcb *tpcb = cs->pcb.tcp;
+  if (idle > 0 && interval > 0 && count > 0) {
+    tpcb->keep_idle = idle * 1000;
+    tpcb->keep_intvl = interval * 1000;
+    tpcb->keep_cnt = count;
+    tpcb->so_options |= SOF_KEEPALIVE;
+  } else {
+    tpcb->so_options &= ~SOF_KEEPALIVE;
+  }
+}
+#elif !defined(MG_NO_LWIP_TCP_KEEPALIVE)
+#warning LWIP TCP keepalive is disabled. Please consider enabling it.
+#endif /* LWIP_TCP_KEEPALIVE */
+
+static err_t mg_lwip_tcp_conn_cb(void *arg, struct tcp_pcb *tpcb, err_t err) {
+  struct mg_connection *nc = (struct mg_connection *) arg;
+  DBG(("%p connect to %s:%u = %d", nc, IPADDR_NTOA(ipX_2_ip(&tpcb->remote_ip)),
+       tpcb->remote_port, err));
+  if (nc == NULL) {
+    tcp_abort(tpcb);
+    return ERR_ARG;
+  }
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  cs->err = err;
+#if LWIP_TCP_KEEPALIVE
+  if (err == 0) mg_lwip_set_keepalive_params(nc, 60, 10, 6);
+#endif
+  mg_lwip_post_signal(MG_SIG_CONNECT_RESULT, nc);
+  return ERR_OK;
+}
+
+static void mg_lwip_tcp_error_cb(void *arg, err_t err) {
+  struct mg_connection *nc = (struct mg_connection *) arg;
+  DBG(("%p conn error %d", nc, err));
+  if (nc == NULL) return;
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  cs->pcb.tcp = NULL; /* Has already been deallocated */
+  if (nc->flags & MG_F_CONNECTING) {
+    cs->err = err;
+    mg_lwip_post_signal(MG_SIG_CONNECT_RESULT, nc);
+  } else {
+    mg_lwip_post_signal(MG_SIG_CLOSE_CONN, nc);
+  }
+}
+
+static err_t mg_lwip_tcp_recv_cb(void *arg, struct tcp_pcb *tpcb,
+                                 struct pbuf *p, err_t err) {
+  struct mg_connection *nc = (struct mg_connection *) arg;
+  DBG(("%p %p %u %d", nc, tpcb, (p != NULL ? p->tot_len : 0), err));
+  if (p == NULL) {
+    if (nc != NULL) {
+      mg_lwip_post_signal(MG_SIG_CLOSE_CONN, nc);
+    } else {
+      /* Tombstoned connection, do nothing. */
+    }
+    return ERR_OK;
+  } else if (nc == NULL) {
+    tcp_abort(tpcb);
+    return ERR_ARG;
+  }
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  /*
+   * If we get a chain of more than one segment at once, we need to bump
+   * refcount on the subsequent bufs to make them independent.
+   */
+  if (p->next != NULL) {
+    struct pbuf *q = p->next;
+    for (; q != NULL; q = q->next) pbuf_ref(q);
+  }
+  if (cs->rx_chain == NULL) {
+    cs->rx_offset = 0;
+  } else if (pbuf_clen(cs->rx_chain) >= 4) {
+    /* ESP SDK has a limited pool of 5 pbufs. We must not hog them all or RX
+     * will be completely blocked. We already have at least 4 in the chain,
+     * this one is, so we have to make a copy and release this one. */
+    struct pbuf *np = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
+    if (np != NULL) {
+      pbuf_copy(np, p);
+      pbuf_free(p);
+      p = np;
+    }
+  }
+  mg_lwip_recv_common(nc, p);
+  return ERR_OK;
+}
+
+static void mg_lwip_handle_recv_tcp(struct mg_connection *nc) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+
+#if MG_ENABLE_SSL
+  if (nc->flags & MG_F_SSL) {
+    if (nc->flags & MG_F_SSL_HANDSHAKE_DONE) {
+      mg_lwip_ssl_recv(nc);
+    } else {
+      mg_lwip_ssl_do_hs(nc);
+    }
+    return;
+  }
+#endif
+
+  mgos_lock();
+  while (cs->rx_chain != NULL) {
+    struct pbuf *seg = cs->rx_chain;
+    size_t len = (seg->len - cs->rx_offset);
+    char *data = (char *) MG_MALLOC(len);
+    if (data == NULL) {
+      mgos_unlock();
+      DBG(("OOM"));
+      return;
+    }
+    pbuf_copy_partial(seg, data, len, cs->rx_offset);
+    mgos_unlock();
+    mg_if_recv_tcp_cb(nc, data, len, 1 /* own */);
+    mgos_lock();
+    cs->rx_offset += len;
+    if (cs->rx_offset == cs->rx_chain->len) {
+      cs->rx_chain = pbuf_dechain(cs->rx_chain);
+      pbuf_free(seg);
+      cs->rx_offset = 0;
+    }
+  }
+  mgos_unlock();
+
+  if (nc->send_mbuf.len > 0) {
+    mg_lwip_mgr_schedule_poll(nc->mgr);
+  }
+}
+
+static err_t mg_lwip_tcp_sent_cb(void *arg, struct tcp_pcb *tpcb,
+                                 u16_t num_sent) {
+  struct mg_connection *nc = (struct mg_connection *) arg;
+  DBG(("%p %p %u", nc, tpcb, num_sent));
+  if (nc == NULL) {
+    tcp_abort(tpcb);
+    return ERR_ABRT;
+  }
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  cs->num_sent += num_sent;
+
+  mg_lwip_post_signal(MG_SIG_SENT_CB, nc);
+  return ERR_OK;
+}
+
+void mg_lwip_if_connect_tcp(struct mg_connection *nc,
+                            const union socket_address *sa) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  struct tcp_pcb *tpcb = TCP_NEW();
+  cs->pcb.tcp = tpcb;
+  ip_addr_t *ip = (ip_addr_t *) &sa->sin.sin_addr.s_addr;
+  u16_t port = ntohs(sa->sin.sin_port);
+  tcp_arg(tpcb, nc);
+  tcp_err(tpcb, mg_lwip_tcp_error_cb);
+  tcp_sent(tpcb, mg_lwip_tcp_sent_cb);
+  tcp_recv(tpcb, mg_lwip_tcp_recv_cb);
+  cs->err = TCP_BIND(tpcb, IP_ADDR_ANY, 0 /* any port */);
+  DBG(("%p tcp_bind = %d", nc, cs->err));
+  if (cs->err != ERR_OK) {
+    mg_lwip_post_signal(MG_SIG_CONNECT_RESULT, nc);
+    return;
+  }
+  cs->err = tcp_connect(tpcb, ip, port, mg_lwip_tcp_conn_cb);
+  DBG(("%p tcp_connect %p = %d", nc, tpcb, cs->err));
+  if (cs->err != ERR_OK) {
+    mg_lwip_post_signal(MG_SIG_CONNECT_RESULT, nc);
+    return;
+  }
+}
+
+/*
+ * Lwip included in the SDKs for nRF5x chips has different type for the
+ * callback of `udp_recv()`
+ */
+#if CS_PLATFORM == CS_P_NRF51 || CS_PLATFORM == CS_P_NRF52 || \
+    CS_PLATFORM == CS_P_STM32
+static void mg_lwip_udp_recv_cb(void *arg, struct udp_pcb *pcb, struct pbuf *p,
+                                const ip_addr_t *addr, u16_t port)
+#else
+static void mg_lwip_udp_recv_cb(void *arg, struct udp_pcb *pcb, struct pbuf *p,
+                                ip_addr_t *addr, u16_t port)
+#endif
+{
+  struct mg_connection *nc = (struct mg_connection *) arg;
+  DBG(("%p %s:%u %p %u %u", nc, IPADDR_NTOA(addr), port, p, p->ref, p->len));
+  /* Put address in a separate pbuf and tack it onto the packet. */
+  struct pbuf *sap =
+      pbuf_alloc(PBUF_RAW, sizeof(union socket_address), PBUF_RAM);
+  if (sap == NULL) {
+    pbuf_free(p);
+    return;
+  }
+  union socket_address *sa = (union socket_address *) sap->payload;
+  sa->sin.sin_addr.s_addr = addr->addr;
+  sa->sin.sin_port = htons(port);
+  /* Logic in the recv handler requires that there be exactly one data pbuf. */
+  p = pbuf_coalesce(p, PBUF_RAW);
+  pbuf_chain(sap, p);
+  mg_lwip_recv_common(nc, sap);
+  (void) pcb;
+}
+
+static void mg_lwip_recv_common(struct mg_connection *nc, struct pbuf *p) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  mgos_lock();
+  if (cs->rx_chain == NULL) {
+    cs->rx_chain = p;
+  } else {
+    pbuf_chain(cs->rx_chain, p);
+  }
+  if (!cs->recv_pending) {
+    cs->recv_pending = 1;
+    mg_lwip_post_signal(MG_SIG_RECV, nc);
+  }
+  mgos_unlock();
+}
+
+static void mg_lwip_handle_recv_udp(struct mg_connection *nc) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  /*
+   * For UDP, RX chain consists of interleaved address and packet bufs:
+   * Address pbuf followed by exactly one data pbuf (recv_cb took care of that).
+   */
+  while (cs->rx_chain != NULL) {
+    struct pbuf *sap = cs->rx_chain;
+    struct pbuf *p = sap->next;
+    cs->rx_chain = pbuf_dechain(p);
+    size_t data_len = p->len;
+    char *data = (char *) MG_MALLOC(data_len);
+    if (data != NULL) {
+      pbuf_copy_partial(p, data, data_len, 0);
+      pbuf_free(p);
+      mg_if_recv_udp_cb(nc, data, data_len,
+                        (union socket_address *) sap->payload, sap->len);
+      pbuf_free(sap);
+    } else {
+      pbuf_free(p);
+      pbuf_free(sap);
+    }
+  }
+}
+
+void mg_lwip_if_connect_udp(struct mg_connection *nc) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  struct udp_pcb *upcb = udp_new();
+  cs->err = UDP_BIND(upcb, IP_ADDR_ANY, 0 /* any port */);
+  DBG(("%p udp_bind %p = %d", nc, upcb, cs->err));
+  if (cs->err == ERR_OK) {
+    udp_recv(upcb, mg_lwip_udp_recv_cb, nc);
+    cs->pcb.udp = upcb;
+  } else {
+    udp_remove(upcb);
+  }
+  mg_lwip_post_signal(MG_SIG_CONNECT_RESULT, nc);
+}
+
+void mg_lwip_accept_conn(struct mg_connection *nc, struct tcp_pcb *tpcb) {
+  union socket_address sa;
+  SET_ADDR(&sa, &tpcb->remote_ip);
+  sa.sin.sin_port = htons(tpcb->remote_port);
+  mg_if_accept_tcp_cb(nc, &sa, sizeof(sa.sin));
+}
+
+void mg_lwip_handle_accept(struct mg_connection *nc) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+#if MG_ENABLE_SSL
+  if (cs->lc->flags & MG_F_SSL) {
+    if (mg_ssl_if_conn_accept(nc, cs->lc) != MG_SSL_OK) {
+      LOG(LL_ERROR, ("SSL error"));
+      tcp_close(cs->pcb.tcp);
+    }
+  } else
+#endif
+  {
+    mg_lwip_accept_conn(nc, cs->pcb.tcp);
+  }
+}
+
+static err_t mg_lwip_accept_cb(void *arg, struct tcp_pcb *newtpcb, err_t err) {
+  struct mg_connection *lc = (struct mg_connection *) arg;
+  DBG(("%p conn %p from %s:%u", lc, newtpcb,
+       IPADDR_NTOA(ipX_2_ip(&newtpcb->remote_ip)), newtpcb->remote_port));
+  struct mg_connection *nc = mg_if_accept_new_conn(lc);
+  if (nc == NULL) {
+    tcp_abort(newtpcb);
+    return ERR_ABRT;
+  }
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  cs->lc = lc;
+  cs->pcb.tcp = newtpcb;
+  /* We need to set up callbacks before returning because data may start
+   * arriving immediately. */
+  tcp_arg(newtpcb, nc);
+  tcp_err(newtpcb, mg_lwip_tcp_error_cb);
+  tcp_sent(newtpcb, mg_lwip_tcp_sent_cb);
+  tcp_recv(newtpcb, mg_lwip_tcp_recv_cb);
+#if LWIP_TCP_KEEPALIVE
+  mg_lwip_set_keepalive_params(nc, 60, 10, 6);
+#endif
+  mg_lwip_post_signal(MG_SIG_ACCEPT, nc);
+  (void) err;
+  return ERR_OK;
+}
+
+int mg_lwip_if_listen_tcp(struct mg_connection *nc, union socket_address *sa) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  struct tcp_pcb *tpcb = TCP_NEW();
+  ip_addr_t *ip = (ip_addr_t *) &sa->sin.sin_addr.s_addr;
+  u16_t port = ntohs(sa->sin.sin_port);
+  cs->err = TCP_BIND(tpcb, ip, port);
+  DBG(("%p tcp_bind(%s:%u) = %d", nc, IPADDR_NTOA(ip), port, cs->err));
+  if (cs->err != ERR_OK) {
+    tcp_close(tpcb);
+    return -1;
+  }
+  tcp_arg(tpcb, nc);
+  tpcb = tcp_listen(tpcb);
+  cs->pcb.tcp = tpcb;
+  tcp_accept(tpcb, mg_lwip_accept_cb);
+  return 0;
+}
+
+int mg_lwip_if_listen_udp(struct mg_connection *nc, union socket_address *sa) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  struct udp_pcb *upcb = udp_new();
+  ip_addr_t *ip = (ip_addr_t *) &sa->sin.sin_addr.s_addr;
+  u16_t port = ntohs(sa->sin.sin_port);
+  cs->err = UDP_BIND(upcb, ip, port);
+  DBG(("%p udb_bind(%s:%u) = %d", nc, IPADDR_NTOA(ip), port, cs->err));
+  if (cs->err != ERR_OK) {
+    udp_remove(upcb);
+    return -1;
+  }
+  udp_recv(upcb, mg_lwip_udp_recv_cb, nc);
+  cs->pcb.udp = upcb;
+  return 0;
+}
+
+int mg_lwip_tcp_write(struct mg_connection *nc, const void *data,
+                      uint16_t len) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  struct tcp_pcb *tpcb = cs->pcb.tcp;
+  len = MIN(tpcb->mss, MIN(len, tpcb->snd_buf));
+  if (len == 0) {
+    DBG(("%p no buf avail %u %u %p %p", tpcb, tpcb->snd_buf,
+         tpcb->snd_queuelen, tpcb->unsent, tpcb->unacked));
+    tcp_output(tpcb);
+    return 0;
+  }
+/*
+ * On ESP8266 we only allow one TCP segment in flight at any given time.
+ * This may increase latency and reduce efficiency of tcp windowing,
+ * but memory is scarce and precious on that platform so we do this to
+ * reduce footprint.
+ */
+#if CS_PLATFORM == CS_P_ESP8266
+  if (tpcb->unacked != NULL) {
+    return 0;
+  }
+  if (tpcb->unsent != NULL) {
+    len = MIN(len, (TCP_MSS - tpcb->unsent->len));
+  }
+#endif
+  err_t err = tcp_write(tpcb, data, len, TCP_WRITE_FLAG_COPY);
+  DBG(("%p tcp_write %u = %d", tpcb, len, err));
+  if (err != ERR_OK) {
+    /*
+     * We ignore ERR_MEM because memory will be freed up when the data is sent
+     * and we'll retry.
+     */
+    return (err == ERR_MEM ? 0 : -1);
+  }
+  return len;
+}
+
+static void mg_lwip_send_more(struct mg_connection *nc) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  if (nc->sock == INVALID_SOCKET || cs->pcb.tcp == NULL) {
+    DBG(("%p invalid socket", nc));
+    return;
+  }
+  int num_written = mg_lwip_tcp_write(nc, nc->send_mbuf.buf, nc->send_mbuf.len);
+  DBG(("%p mg_lwip_tcp_write %u = %d", nc, nc->send_mbuf.len, num_written));
+  if (num_written == 0) return;
+  if (num_written < 0) {
+    mg_lwip_post_signal(MG_SIG_CLOSE_CONN, nc);
+  }
+  mbuf_remove(&nc->send_mbuf, num_written);
+  mbuf_trim(&nc->send_mbuf);
+}
+
+void mg_lwip_if_tcp_send(struct mg_connection *nc, const void *buf,
+                         size_t len) {
+  mbuf_append(&nc->send_mbuf, buf, len);
+  mg_lwip_mgr_schedule_poll(nc->mgr);
+}
+
+void mg_lwip_if_udp_send(struct mg_connection *nc, const void *buf,
+                         size_t len) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  if (nc->sock == INVALID_SOCKET || cs->pcb.udp == NULL) {
+    /*
+     * In case of UDP, this usually means, what
+     * async DNS resolve is still in progress and connection
+     * is not ready yet
+     */
+    DBG(("%p socket is not connected", nc));
+    return;
+  }
+  struct udp_pcb *upcb = cs->pcb.udp;
+  struct pbuf *p = pbuf_alloc(PBUF_TRANSPORT, len, PBUF_RAM);
+  ip_addr_t *ip = (ip_addr_t *) &nc->sa.sin.sin_addr.s_addr;
+  u16_t port = ntohs(nc->sa.sin.sin_port);
+  if (p == NULL) {
+    DBG(("OOM"));
+    return;
+  }
+  memcpy(p->payload, buf, len);
+  cs->err = udp_sendto(upcb, p, (ip_addr_t *) ip, port);
+  DBG(("%p udp_sendto = %d", nc, cs->err));
+  pbuf_free(p);
+  if (cs->err != ERR_OK) {
+    mg_lwip_post_signal(MG_SIG_CLOSE_CONN, nc);
+  } else {
+    cs->num_sent += len;
+    mg_lwip_post_signal(MG_SIG_SENT_CB, nc);
+  }
+}
+
+void mg_lwip_if_recved(struct mg_connection *nc, size_t len) {
+  if (nc->flags & MG_F_UDP) return;
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  if (nc->sock == INVALID_SOCKET || cs->pcb.tcp == NULL) {
+    DBG(("%p invalid socket", nc));
+    return;
+  }
+  DBG(("%p %p %u", nc, cs->pcb.tcp, len));
+/* Currently SSL acknowledges data immediately.
+ * TODO(rojer): Find a way to propagate mg_lwip_if_recved. */
+#if MG_ENABLE_SSL
+  if (!(nc->flags & MG_F_SSL)) {
+    tcp_recved(cs->pcb.tcp, len);
+  }
+#else
+  tcp_recved(cs->pcb.tcp, len);
+#endif
+  mbuf_trim(&nc->recv_mbuf);
+}
+
+int mg_lwip_if_create_conn(struct mg_connection *nc) {
+  struct mg_lwip_conn_state *cs =
+      (struct mg_lwip_conn_state *) MG_CALLOC(1, sizeof(*cs));
+  if (cs == NULL) return 0;
+  cs->nc = nc;
+  nc->sock = (intptr_t) cs;
+  return 1;
+}
+
+void mg_lwip_if_destroy_conn(struct mg_connection *nc) {
+  if (nc->sock == INVALID_SOCKET) return;
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  if (!(nc->flags & MG_F_UDP)) {
+    struct tcp_pcb *tpcb = cs->pcb.tcp;
+    if (tpcb != NULL) {
+      tcp_arg(tpcb, NULL);
+      DBG(("%p tcp_close %p", nc, tpcb));
+      tcp_arg(tpcb, NULL);
+      tcp_close(tpcb);
+    }
+    while (cs->rx_chain != NULL) {
+      struct pbuf *seg = cs->rx_chain;
+      cs->rx_chain = pbuf_dechain(cs->rx_chain);
+      pbuf_free(seg);
+    }
+    memset(cs, 0, sizeof(*cs));
+    MG_FREE(cs);
+  } else if (nc->listener == NULL) {
+    /* Only close outgoing UDP pcb or listeners. */
+    struct udp_pcb *upcb = cs->pcb.udp;
+    if (upcb != NULL) {
+      DBG(("%p udp_remove %p", nc, upcb));
+      udp_remove(upcb);
+    }
+    memset(cs, 0, sizeof(*cs));
+    MG_FREE(cs);
+  }
+  nc->sock = INVALID_SOCKET;
+}
+
+void mg_lwip_if_get_conn_addr(struct mg_connection *nc, int remote,
+                              union socket_address *sa) {
+  memset(sa, 0, sizeof(*sa));
+  if (nc->sock == INVALID_SOCKET) return;
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  if (nc->flags & MG_F_UDP) {
+    struct udp_pcb *upcb = cs->pcb.udp;
+    if (remote) {
+      memcpy(sa, &nc->sa, sizeof(*sa));
+    } else {
+      sa->sin.sin_port = htons(upcb->local_port);
+      SET_ADDR(sa, &upcb->local_ip);
+    }
+  } else {
+    struct tcp_pcb *tpcb = cs->pcb.tcp;
+    if (remote) {
+      sa->sin.sin_port = htons(tpcb->remote_port);
+      SET_ADDR(sa, &tpcb->remote_ip);
+    } else {
+      sa->sin.sin_port = htons(tpcb->local_port);
+      SET_ADDR(sa, &tpcb->local_ip);
+    }
+  }
+}
+
+void mg_lwip_if_sock_set(struct mg_connection *nc, sock_t sock) {
+  nc->sock = sock;
+}
+
+/* clang-format off */
+#define MG_LWIP_IFACE_VTABLE                                          \
+  {                                                                   \
+    mg_lwip_if_init,                                                  \
+    mg_lwip_if_free,                                                  \
+    mg_lwip_if_add_conn,                                              \
+    mg_lwip_if_remove_conn,                                           \
+    mg_lwip_if_poll,                                                  \
+    mg_lwip_if_listen_tcp,                                            \
+    mg_lwip_if_listen_udp,                                            \
+    mg_lwip_if_connect_tcp,                                           \
+    mg_lwip_if_connect_udp,                                           \
+    mg_lwip_if_tcp_send,                                              \
+    mg_lwip_if_udp_send,                                              \
+    mg_lwip_if_recved,                                                \
+    mg_lwip_if_create_conn,                                           \
+    mg_lwip_if_destroy_conn,                                          \
+    mg_lwip_if_sock_set,                                              \
+    mg_lwip_if_get_conn_addr,                                         \
+  }
+/* clang-format on */
+
+struct mg_iface_vtable mg_lwip_iface_vtable = MG_LWIP_IFACE_VTABLE;
+#if MG_NET_IF == MG_NET_IF_LWIP_LOW_LEVEL
+struct mg_iface_vtable mg_default_iface_vtable = MG_LWIP_IFACE_VTABLE;
+#endif
+
+#endif /* MG_ENABLE_NET_IF_LWIP_LOW_LEVEL */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/lwip/mg_lwip_ev_mgr.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_NET_IF == MG_NET_IF_LWIP_LOW_LEVEL
+
+#ifndef MG_SIG_QUEUE_LEN
+#define MG_SIG_QUEUE_LEN 32
+#endif
+
+struct mg_ev_mgr_lwip_signal {
+  int sig;
+  struct mg_connection *nc;
+};
+
+struct mg_ev_mgr_lwip_data {
+  struct mg_ev_mgr_lwip_signal sig_queue[MG_SIG_QUEUE_LEN];
+  int sig_queue_len;
+  int start_index;
+};
+
+void mg_lwip_post_signal(enum mg_sig_type sig, struct mg_connection *nc) {
+  struct mg_ev_mgr_lwip_data *md =
+      (struct mg_ev_mgr_lwip_data *) nc->iface->data;
+  mgos_lock();
+  if (md->sig_queue_len >= MG_SIG_QUEUE_LEN) {
+    mgos_unlock();
+    return;
+  }
+  int end_index = (md->start_index + md->sig_queue_len) % MG_SIG_QUEUE_LEN;
+  md->sig_queue[end_index].sig = sig;
+  md->sig_queue[end_index].nc = nc;
+  md->sig_queue_len++;
+  mg_lwip_mgr_schedule_poll(nc->mgr);
+  mgos_unlock();
+}
+
+void mg_ev_mgr_lwip_process_signals(struct mg_mgr *mgr) {
+  struct mg_ev_mgr_lwip_data *md =
+      (struct mg_ev_mgr_lwip_data *) mgr->ifaces[MG_MAIN_IFACE]->data;
+  while (md->sig_queue_len > 0) {
+    mgos_lock();
+    int sig = md->sig_queue[md->start_index].sig;
+    struct mg_connection *nc = md->sig_queue[md->start_index].nc;
+    struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+    md->start_index = (md->start_index + 1) % MG_SIG_QUEUE_LEN;
+    md->sig_queue_len--;
+    mgos_unlock();
+    if (nc->iface == NULL || nc->mgr == NULL) continue;
+    switch (sig) {
+      case MG_SIG_CONNECT_RESULT: {
+#if MG_ENABLE_SSL
+        if (cs->err == 0 && (nc->flags & MG_F_SSL) &&
+            !(nc->flags & MG_F_SSL_HANDSHAKE_DONE)) {
+          mg_lwip_ssl_do_hs(nc);
+        } else
+#endif
+        {
+          mg_if_connect_cb(nc, cs->err);
+        }
+        break;
+      }
+      case MG_SIG_CLOSE_CONN: {
+        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+        mg_close_conn(nc);
+        break;
+      }
+      case MG_SIG_RECV: {
+        cs->recv_pending = 0;
+        if (nc->flags & MG_F_UDP) {
+          mg_lwip_handle_recv_udp(nc);
+        } else {
+          mg_lwip_handle_recv_tcp(nc);
+        }
+        break;
+      }
+      case MG_SIG_SENT_CB: {
+        if (cs->num_sent > 0) mg_if_sent_cb(nc, cs->num_sent);
+        cs->num_sent = 0;
+
+        if (nc->send_mbuf.len == 0 && (nc->flags & MG_F_SEND_AND_CLOSE) &&
+            !(nc->flags & MG_F_WANT_WRITE)) {
+          mg_close_conn(nc);
+        }
+
+        break;
+      }
+      case MG_SIG_TOMBSTONE: {
+        break;
+      }
+      case MG_SIG_ACCEPT: {
+        mg_lwip_handle_accept(nc);
+        break;
+      }
+    }
+  }
+}
+
+void mg_lwip_if_init(struct mg_iface *iface) {
+  LOG(LL_INFO, ("%p Mongoose init"));
+  iface->data = MG_CALLOC(1, sizeof(struct mg_ev_mgr_lwip_data));
+}
+
+void mg_lwip_if_free(struct mg_iface *iface) {
+  MG_FREE(iface->data);
+  iface->data = NULL;
+}
+
+void mg_lwip_if_add_conn(struct mg_connection *nc) {
+  (void) nc;
+}
+
+void mg_lwip_if_remove_conn(struct mg_connection *nc) {
+  struct mg_ev_mgr_lwip_data *md =
+      (struct mg_ev_mgr_lwip_data *) nc->iface->data;
+  /* Walk the queue and null-out further signals for this conn. */
+  for (int i = 0; i < MG_SIG_QUEUE_LEN; i++) {
+    if (md->sig_queue[i].nc == nc) {
+      md->sig_queue[i].sig = MG_SIG_TOMBSTONE;
+    }
+  }
+}
+
+time_t mg_lwip_if_poll(struct mg_iface *iface, int timeout_ms) {
+  struct mg_mgr *mgr = iface->mgr;
+  int n = 0;
+  double now = mg_time();
+  struct mg_connection *nc, *tmp;
+  double min_timer = 0;
+  int num_timers = 0;
+#if 0
+  DBG(("begin poll @%u", (unsigned int) (now * 1000)));
+#endif
+  mg_ev_mgr_lwip_process_signals(mgr);
+  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
+    struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+    tmp = nc->next;
+    n++;
+    if ((nc->flags & MG_F_CLOSE_IMMEDIATELY) ||
+        ((nc->flags & MG_F_SEND_AND_CLOSE) && (nc->flags & MG_F_UDP) &&
+         (nc->send_mbuf.len == 0))) {
+      mg_close_conn(nc);
+      continue;
+    }
+    mg_if_poll(nc, now);
+    mg_if_timer(nc, now);
+#if MG_ENABLE_SSL
+    if ((nc->flags & MG_F_SSL) && cs != NULL && cs->pcb.tcp != NULL &&
+        cs->pcb.tcp->state == ESTABLISHED) {
+      if (((nc->flags & MG_F_WANT_WRITE) ||
+           ((nc->send_mbuf.len > 0) &&
+            (nc->flags & MG_F_SSL_HANDSHAKE_DONE))) &&
+          cs->pcb.tcp->snd_buf > 0) {
+        /* Can write more. */
+        if (nc->flags & MG_F_SSL_HANDSHAKE_DONE) {
+          if (!(nc->flags & MG_F_CONNECTING)) mg_lwip_ssl_send(nc);
+        } else {
+          mg_lwip_ssl_do_hs(nc);
+        }
+      }
+      if (cs->rx_chain != NULL || (nc->flags & MG_F_WANT_READ)) {
+        if (nc->flags & MG_F_SSL_HANDSHAKE_DONE) {
+          if (!(nc->flags & MG_F_CONNECTING)) mg_lwip_ssl_recv(nc);
+        } else {
+          mg_lwip_ssl_do_hs(nc);
+        }
+      }
+    } else
+#endif /* MG_ENABLE_SSL */
+    {
+      if (!(nc->flags & (MG_F_CONNECTING | MG_F_UDP))) {
+        if (nc->send_mbuf.len > 0) mg_lwip_send_more(nc);
+      }
+    }
+    if (nc->sock != INVALID_SOCKET &&
+        !(nc->flags & (MG_F_UDP | MG_F_LISTENING)) && cs->pcb.tcp != NULL &&
+        cs->pcb.tcp->unsent != NULL) {
+      tcp_output(cs->pcb.tcp);
+    }
+    if (nc->ev_timer_time > 0) {
+      if (num_timers == 0 || nc->ev_timer_time < min_timer) {
+        min_timer = nc->ev_timer_time;
+      }
+      num_timers++;
+    }
+  }
+#if 0
+  DBG(("end poll @%u, %d conns, %d timers (min %u), next in %d ms",
+       (unsigned int) (now * 1000), n, num_timers,
+       (unsigned int) (min_timer * 1000), timeout_ms));
+#endif
+  (void) timeout_ms;
+  return now;
+}
+
+uint32_t mg_lwip_get_poll_delay_ms(struct mg_mgr *mgr) {
+  struct mg_connection *nc;
+  double now = mg_time();
+  double min_timer = 0;
+  int num_timers = 0;
+  mg_ev_mgr_lwip_process_signals(mgr);
+  for (nc = mg_next(mgr, NULL); nc != NULL; nc = mg_next(mgr, nc)) {
+    struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+    if (nc->ev_timer_time > 0) {
+      if (num_timers == 0 || nc->ev_timer_time < min_timer) {
+        min_timer = nc->ev_timer_time;
+      }
+      num_timers++;
+    }
+    if (nc->send_mbuf.len > 0) {
+      int can_send = 0;
+      /* We have stuff to send, but can we? */
+      if (nc->flags & MG_F_UDP) {
+        /* UDP is always ready for sending. */
+        can_send = (cs->pcb.udp != NULL);
+      } else {
+        can_send = (cs->pcb.tcp != NULL && cs->pcb.tcp->snd_buf > 0);
+      }
+      /* We want and can send, request a poll immediately. */
+      if (can_send) return 0;
+    }
+  }
+  uint32_t timeout_ms = ~0;
+  if (num_timers > 0) {
+    double timer_timeout_ms = (min_timer - now) * 1000 + 1 /* rounding */;
+    if (timer_timeout_ms < timeout_ms) {
+      timeout_ms = timer_timeout_ms;
+    }
+  }
+  return timeout_ms;
+}
+
+#endif /* MG_NET_IF == MG_NET_IF_LWIP_LOW_LEVEL */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/lwip/mg_lwip_ssl_if.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_SSL && MG_NET_IF == MG_NET_IF_LWIP_LOW_LEVEL
+
+/* Amalgamated: #include "common/cs_dbg.h" */
+
+#include <lwip/pbuf.h>
+#include <lwip/tcp.h>
+
+#ifndef MG_LWIP_SSL_IO_SIZE
+#define MG_LWIP_SSL_IO_SIZE 1024
+#endif
+
+/*
+ * Stop processing incoming SSL traffic when recv_mbuf.size is this big.
+ * It'a a uick solution for SSL recv pushback.
+ */
+#ifndef MG_LWIP_SSL_RECV_MBUF_LIMIT
+#define MG_LWIP_SSL_RECV_MBUF_LIMIT 3072
+#endif
+
+#ifndef MIN
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#endif
+
+void mg_lwip_ssl_do_hs(struct mg_connection *nc) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  int server_side = (nc->listener != NULL);
+  enum mg_ssl_if_result res;
+  if (nc->flags & MG_F_CLOSE_IMMEDIATELY) return;
+  res = mg_ssl_if_handshake(nc);
+  DBG(("%p %d %d %d", nc, nc->flags, server_side, res));
+  if (res != MG_SSL_OK) {
+    if (res == MG_SSL_WANT_WRITE) {
+      nc->flags |= MG_F_WANT_WRITE;
+      cs->err = 0;
+    } else if (res == MG_SSL_WANT_READ) {
+      /*
+       * Nothing to do in particular, we are callback-driven.
+       * What we definitely do not need anymore is SSL reading (nothing left).
+       */
+      nc->flags &= ~MG_F_WANT_READ;
+      cs->err = 0;
+    } else {
+      cs->err = res;
+      if (server_side) {
+        mg_lwip_post_signal(MG_SIG_CLOSE_CONN, nc);
+      } else {
+        mg_lwip_post_signal(MG_SIG_CONNECT_RESULT, nc);
+      }
+    }
+  } else {
+    cs->err = 0;
+    nc->flags &= ~MG_F_WANT_WRITE;
+    /*
+     * Handshake is done. Schedule a read immediately to consume app data
+     * which may already be waiting.
+     */
+    nc->flags |= (MG_F_SSL_HANDSHAKE_DONE | MG_F_WANT_READ);
+    if (server_side) {
+      mg_lwip_accept_conn(nc, cs->pcb.tcp);
+    } else {
+      mg_lwip_post_signal(MG_SIG_CONNECT_RESULT, nc);
+    }
+  }
+}
+
+void mg_lwip_ssl_send(struct mg_connection *nc) {
+  if (nc->sock == INVALID_SOCKET) {
+    DBG(("%p invalid socket", nc));
+    return;
+  }
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  /* It's ok if the buffer is empty. Return value of 0 may also be valid. */
+  int len = cs->last_ssl_write_size;
+  if (len == 0) {
+    len = MIN(MG_LWIP_SSL_IO_SIZE, nc->send_mbuf.len);
+  }
+  int ret = mg_ssl_if_write(nc, nc->send_mbuf.buf, len);
+  DBG(("%p SSL_write %u = %d, %d", nc, len, ret));
+  if (ret > 0) {
+    mbuf_remove(&nc->send_mbuf, ret);
+    mbuf_trim(&nc->send_mbuf);
+    cs->last_ssl_write_size = 0;
+  } else if (ret < 0) {
+    /* This is tricky. We must remember the exact data we were sending to retry
+     * exactly the same send next time. */
+    cs->last_ssl_write_size = len;
+  }
+  if (ret == len) {
+    nc->flags &= ~MG_F_WANT_WRITE;
+  } else if (ret == MG_SSL_WANT_WRITE) {
+    nc->flags |= MG_F_WANT_WRITE;
+  } else {
+    mg_lwip_post_signal(MG_SIG_CLOSE_CONN, nc);
+  }
+}
+
+void mg_lwip_ssl_recv(struct mg_connection *nc) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  /* Don't deliver data before connect callback */
+  if (nc->flags & MG_F_CONNECTING) return;
+  while (nc->recv_mbuf.len < MG_LWIP_SSL_RECV_MBUF_LIMIT) {
+    char *buf = (char *) MG_MALLOC(MG_LWIP_SSL_IO_SIZE);
+    if (buf == NULL) return;
+    int ret = mg_ssl_if_read(nc, buf, MG_LWIP_SSL_IO_SIZE);
+    DBG(("%p %p SSL_read %u = %d", nc, cs->rx_chain, MG_LWIP_SSL_IO_SIZE, ret));
+    if (ret <= 0) {
+      MG_FREE(buf);
+      if (ret == MG_SSL_WANT_WRITE) {
+        nc->flags |= MG_F_WANT_WRITE;
+        return;
+      } else if (ret == MG_SSL_WANT_READ) {
+        /*
+         * Nothing to do in particular, we are callback-driven.
+         * What we definitely do not need anymore is SSL reading (nothing left).
+         */
+        nc->flags &= ~MG_F_WANT_READ;
+        cs->err = 0;
+        return;
+      } else {
+        mg_lwip_post_signal(MG_SIG_CLOSE_CONN, nc);
+        return;
+      }
+    } else {
+      mg_if_recv_tcp_cb(nc, buf, ret, 1 /* own */);
+    }
+  }
+}
+
+#ifdef KR_VERSION
+
+ssize_t kr_send(int fd, const void *buf, size_t len) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) fd;
+  int ret = mg_lwip_tcp_write(cs->nc, buf, len);
+  DBG(("%p mg_lwip_tcp_write %u = %d", cs->nc, len, ret));
+  if (ret == 0) ret = KR_IO_WOULDBLOCK;
+  return ret;
+}
+
+ssize_t kr_recv(int fd, void *buf, size_t len) {
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) fd;
+  struct pbuf *seg = cs->rx_chain;
+  if (seg == NULL) {
+    DBG(("%u - nothing to read", len));
+    return KR_IO_WOULDBLOCK;
+  }
+  size_t seg_len = (seg->len - cs->rx_offset);
+  DBG(("%u %u %u %u", len, cs->rx_chain->len, seg_len, cs->rx_chain->tot_len));
+  len = MIN(len, seg_len);
+  pbuf_copy_partial(seg, buf, len, cs->rx_offset);
+  cs->rx_offset += len;
+  tcp_recved(cs->pcb.tcp, len);
+  if (cs->rx_offset == cs->rx_chain->len) {
+    cs->rx_chain = pbuf_dechain(cs->rx_chain);
+    pbuf_free(seg);
+    cs->rx_offset = 0;
+  }
+  return len;
+}
+
+#elif MG_SSL_IF == MG_SSL_IF_MBEDTLS
+
+int ssl_socket_send(void *ctx, const unsigned char *buf, size_t len) {
+  struct mg_connection *nc = (struct mg_connection *) ctx;
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  int ret = mg_lwip_tcp_write(cs->nc, buf, len);
+  LOG(LL_DEBUG, ("%p %d -> %d", nc, len, ret));
+  if (ret == 0) ret = MBEDTLS_ERR_SSL_WANT_WRITE;
+  return ret;
+}
+
+int ssl_socket_recv(void *ctx, unsigned char *buf, size_t len) {
+  struct mg_connection *nc = (struct mg_connection *) ctx;
+  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
+  struct pbuf *seg = cs->rx_chain;
+  if (seg == NULL) {
+    DBG(("%u - nothing to read", len));
+    return MBEDTLS_ERR_SSL_WANT_READ;
+  }
+  size_t seg_len = (seg->len - cs->rx_offset);
+  DBG(("%u %u %u %u", len, cs->rx_chain->len, seg_len, cs->rx_chain->tot_len));
+  len = MIN(len, seg_len);
+  pbuf_copy_partial(seg, buf, len, cs->rx_offset);
+  cs->rx_offset += len;
+  /* TCP PCB may be NULL if connection has already been closed
+   * but we still have data to deliver to SSL. */
+  if (cs->pcb.tcp != NULL) tcp_recved(cs->pcb.tcp, len);
+  if (cs->rx_offset == cs->rx_chain->len) {
+    cs->rx_chain = pbuf_dechain(cs->rx_chain);
+    pbuf_free(seg);
+    cs->rx_offset = 0;
+  }
+  LOG(LL_DEBUG, ("%p <- %d", nc, (int) len));
+  return len;
+}
+
+#endif
+
+#endif /* MG_ENABLE_SSL && MG_NET_IF == MG_NET_IF_LWIP_LOW_LEVEL */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/wince/wince_libc.c"
+#endif
+/*
+ * Copyright (c) 2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifdef WINCE
+
+const char *strerror(int err) {
+  /*
+   * TODO(alashkin): there is no strerror on WinCE;
+   * look for similar wce_xxxx function
+   */
+  static char buf[10];
+  snprintf(buf, sizeof(buf), "%d", err);
+  return buf;
+}
+
+int open(const char *filename, int oflag, int pmode) {
+  /*
+   * TODO(alashkin): mg_open function is not used in mongoose
+   * but exists in documentation as utility function
+   * Shall we delete it at all or implement for WinCE as well?
+   */
+  DebugBreak();
+  return 0; /* for compiler */
+}
+
+int _wstati64(const wchar_t *path, cs_stat_t *st) {
+  DWORD fa = GetFileAttributesW(path);
+  if (fa == INVALID_FILE_ATTRIBUTES) {
+    return -1;
+  }
+  memset(st, 0, sizeof(*st));
+  if ((fa & FILE_ATTRIBUTE_DIRECTORY) == 0) {
+    HANDLE h;
+    FILETIME ftime;
+    st->st_mode |= _S_IFREG;
+    h = CreateFileW(path, GENERIC_READ, 0, NULL, OPEN_EXISTING,
+                    FILE_ATTRIBUTE_NORMAL, NULL);
+    if (h == INVALID_HANDLE_VALUE) {
+      return -1;
+    }
+    st->st_size = GetFileSize(h, NULL);
+    GetFileTime(h, NULL, NULL, &ftime);
+    st->st_mtime = (uint32_t)((((uint64_t) ftime.dwLowDateTime +
+                                ((uint64_t) ftime.dwHighDateTime << 32)) /
+                               10000000.0) -
+                              11644473600);
+    CloseHandle(h);
+  } else {
+    st->st_mode |= _S_IFDIR;
+  }
+  return 0;
+}
+
+/* Windows CE doesn't have neither gmtime nor strftime */
+static void mg_gmt_time_string(char *buf, size_t buf_len, time_t *t) {
+  FILETIME ft;
+  SYSTEMTIME systime;
+  if (t != NULL) {
+    uint64_t filetime = (*t + 11644473600) * 10000000;
+    ft.dwLowDateTime = filetime & 0xFFFFFFFF;
+    ft.dwHighDateTime = (filetime & 0xFFFFFFFF00000000) >> 32;
+    FileTimeToSystemTime(&ft, &systime);
+  } else {
+    GetSystemTime(&systime);
+  }
+  /* There is no PRIu16 in WinCE SDK */
+  snprintf(buf, buf_len, "%d.%d.%d %d:%d:%d GMT", (int) systime.wYear,
+           (int) systime.wMonth, (int) systime.wDay, (int) systime.wHour,
+           (int) systime.wMinute, (int) systime.wSecond);
+}
+
+#endif
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/pic32/pic32_net_if.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_PIC32_NET_IF_H_
+#define CS_COMMON_PLATFORMS_PIC32_NET_IF_H_
+
+/* Amalgamated: #include "mongoose/src/net_if.h" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#ifndef MG_ENABLE_NET_IF_PIC32
+#define MG_ENABLE_NET_IF_PIC32 MG_NET_IF == MG_NET_IF_PIC32
+#endif
+
+extern struct mg_iface_vtable mg_pic32_iface_vtable;
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* CS_COMMON_PLATFORMS_PIC32_NET_IF_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/pic32/pic32_net_if.c"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_NET_IF_PIC32
+
+int mg_pic32_if_create_conn(struct mg_connection *nc) {
+  (void) nc;
+  return 1;
+}
+
+void mg_pic32_if_recved(struct mg_connection *nc, size_t len) {
+  (void) nc;
+  (void) len;
+}
+
+void mg_pic32_if_add_conn(struct mg_connection *nc) {
+  (void) nc;
+}
+
+void mg_pic32_if_init(struct mg_iface *iface) {
+  (void) iface;
+  (void) mg_get_errno(); /* Shutup compiler */
+}
+
+void mg_pic32_if_free(struct mg_iface *iface) {
+  (void) iface;
+}
+
+void mg_pic32_if_remove_conn(struct mg_connection *nc) {
+  (void) nc;
+}
+
+void mg_pic32_if_destroy_conn(struct mg_connection *nc) {
+  if (nc->sock == INVALID_SOCKET) return;
+  /* For UDP, only close outgoing sockets or listeners. */
+  if (!(nc->flags & MG_F_UDP)) {
+    /* Close TCP */
+    TCPIP_TCP_Close((TCP_SOCKET) nc->sock);
+  } else if (nc->listener == NULL) {
+    /* Only close outgoing UDP or listeners. */
+    TCPIP_UDP_Close((UDP_SOCKET) nc->sock);
+  }
+
+  nc->sock = INVALID_SOCKET;
+}
+
+int mg_pic32_if_listen_udp(struct mg_connection *nc, union socket_address *sa) {
+  nc->sock = TCPIP_UDP_ServerOpen(
+      sa->sin.sin_family == AF_INET ? IP_ADDRESS_TYPE_IPV4
+                                    : IP_ADDRESS_TYPE_IPV6,
+      ntohs(sa->sin.sin_port),
+      sa->sin.sin_addr.s_addr == 0 ? 0 : (IP_MULTI_ADDRESS *) &sa->sin);
+  if (nc->sock == INVALID_SOCKET) {
+    return -1;
+  }
+  return 0;
+}
+
+void mg_pic32_if_udp_send(struct mg_connection *nc, const void *buf,
+                          size_t len) {
+  mbuf_append(&nc->send_mbuf, buf, len);
+}
+
+void mg_pic32_if_tcp_send(struct mg_connection *nc, const void *buf,
+                          size_t len) {
+  mbuf_append(&nc->send_mbuf, buf, len);
+}
+
+int mg_pic32_if_listen_tcp(struct mg_connection *nc, union socket_address *sa) {
+  nc->sock = TCPIP_TCP_ServerOpen(
+      sa->sin.sin_family == AF_INET ? IP_ADDRESS_TYPE_IPV4
+                                    : IP_ADDRESS_TYPE_IPV6,
+      ntohs(sa->sin.sin_port),
+      sa->sin.sin_addr.s_addr == 0 ? 0 : (IP_MULTI_ADDRESS *) &sa->sin);
+  memcpy(&nc->sa, sa, sizeof(*sa));
+  if (nc->sock == INVALID_SOCKET) {
+    return -1;
+  }
+  return 0;
+}
+
+static int mg_accept_conn(struct mg_connection *lc) {
+  struct mg_connection *nc;
+  TCP_SOCKET_INFO si;
+  union socket_address sa;
+
+  nc = mg_if_accept_new_conn(lc);
+
+  if (nc == NULL) {
+    return 0;
+  }
+
+  nc->sock = lc->sock;
+  nc->flags &= ~MG_F_LISTENING;
+
+  if (!TCPIP_TCP_SocketInfoGet((TCP_SOCKET) nc->sock, &si)) {
+    return 0;
+  }
+
+  if (si.addressType == IP_ADDRESS_TYPE_IPV4) {
+    sa.sin.sin_family = AF_INET;
+    sa.sin.sin_port = htons(si.remotePort);
+    sa.sin.sin_addr.s_addr = si.remoteIPaddress.v4Add.Val;
+  } else {
+    /* TODO(alashkin): do something with _potential_ IPv6 */
+    memset(&sa, 0, sizeof(sa));
+  }
+
+  mg_if_accept_tcp_cb(nc, (union socket_address *) &sa, sizeof(sa));
+
+  return mg_pic32_if_listen_tcp(lc, &lc->sa) >= 0;
+}
+
+char *inet_ntoa(struct in_addr in) {
+  static char addr[17];
+  snprintf(addr, sizeof(addr), "%d.%d.%d.%d", (int) in.S_un.S_un_b.s_b1,
+           (int) in.S_un.S_un_b.s_b2, (int) in.S_un.S_un_b.s_b3,
+           (int) in.S_un.S_un_b.s_b4);
+  return addr;
+}
+
+static void mg_handle_send(struct mg_connection *nc) {
+  uint16_t bytes_written = 0;
+  if (nc->flags & MG_F_UDP) {
+    if (!TCPIP_UDP_RemoteBind(
+            (UDP_SOCKET) nc->sock,
+            nc->sa.sin.sin_family == AF_INET ? IP_ADDRESS_TYPE_IPV4
+                                             : IP_ADDRESS_TYPE_IPV6,
+            ntohs(nc->sa.sin.sin_port), (IP_MULTI_ADDRESS *) &nc->sa.sin)) {
+      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+      return;
+    }
+    bytes_written = TCPIP_UDP_TxPutIsReady((UDP_SOCKET) nc->sock, 0);
+    if (bytes_written >= nc->send_mbuf.len) {
+      if (TCPIP_UDP_ArrayPut((UDP_SOCKET) nc->sock,
+                             (uint8_t *) nc->send_mbuf.buf,
+                             nc->send_mbuf.len) != nc->send_mbuf.len) {
+        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+        bytes_written = 0;
+      }
+    }
+  } else {
+    bytes_written = TCPIP_TCP_FifoTxFreeGet((TCP_SOCKET) nc->sock);
+    if (bytes_written != 0) {
+      if (bytes_written > nc->send_mbuf.len) {
+        bytes_written = nc->send_mbuf.len;
+      }
+      if (TCPIP_TCP_ArrayPut((TCP_SOCKET) nc->sock,
+                             (uint8_t *) nc->send_mbuf.buf,
+                             bytes_written) != bytes_written) {
+        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+        bytes_written = 0;
+      }
+    }
+  }
+
+  if (bytes_written != 0) {
+    mbuf_remove(&nc->send_mbuf, bytes_written);
+    mg_if_sent_cb(nc, bytes_written);
+  }
+}
+
+static void mg_handle_recv(struct mg_connection *nc) {
+  uint16_t bytes_read = 0;
+  uint8_t *buf = NULL;
+  if (nc->flags & MG_F_UDP) {
+    bytes_read = TCPIP_UDP_GetIsReady((UDP_SOCKET) nc->sock);
+    if (bytes_read != 0 &&
+        (nc->recv_mbuf_limit == -1 ||
+         nc->recv_mbuf.len + bytes_read < nc->recv_mbuf_limit)) {
+      buf = (uint8_t *) MG_MALLOC(bytes_read);
+      if (TCPIP_UDP_ArrayGet((UDP_SOCKET) nc->sock, buf, bytes_read) !=
+          bytes_read) {
+        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+        bytes_read = 0;
+        MG_FREE(buf);
+      }
+    }
+  } else {
+    bytes_read = TCPIP_TCP_GetIsReady((TCP_SOCKET) nc->sock);
+    if (bytes_read != 0) {
+      if (nc->recv_mbuf_limit != -1 &&
+          nc->recv_mbuf_limit - nc->recv_mbuf.len > bytes_read) {
+        bytes_read = nc->recv_mbuf_limit - nc->recv_mbuf.len;
+      }
+      buf = (uint8_t *) MG_MALLOC(bytes_read);
+      if (TCPIP_TCP_ArrayGet((TCP_SOCKET) nc->sock, buf, bytes_read) !=
+          bytes_read) {
+        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
+        MG_FREE(buf);
+        bytes_read = 0;
+      }
+    }
+  }
+
+  if (bytes_read != 0) {
+    mg_if_recv_tcp_cb(nc, buf, bytes_read, 1 /* own */);
+  }
+}
+
+time_t mg_pic32_if_poll(struct mg_iface *iface, int timeout_ms) {
+  struct mg_mgr *mgr = iface->mgr;
+  double now = mg_time();
+  struct mg_connection *nc, *tmp;
+
+  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
+    tmp = nc->next;
+
+    if (nc->flags & MG_F_CONNECTING) {
+      /* processing connections */
+      if (nc->flags & MG_F_UDP ||
+          TCPIP_TCP_IsConnected((TCP_SOCKET) nc->sock)) {
+        mg_if_connect_cb(nc, 0);
+      }
+    } else if (nc->flags & MG_F_LISTENING) {
+      if (TCPIP_TCP_IsConnected((TCP_SOCKET) nc->sock)) {
+        /* accept new connections */
+        mg_accept_conn(nc);
+      }
+    } else {
+      if (nc->send_mbuf.len != 0) {
+        mg_handle_send(nc);
+      }
+
+      if (nc->recv_mbuf_limit == -1 ||
+          nc->recv_mbuf.len < nc->recv_mbuf_limit) {
+        mg_handle_recv(nc);
+      }
+    }
+  }
+
+  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
+    tmp = nc->next;
+    if ((nc->flags & MG_F_CLOSE_IMMEDIATELY) ||
+        (nc->send_mbuf.len == 0 && (nc->flags & MG_F_SEND_AND_CLOSE))) {
+      mg_close_conn(nc);
+    }
+  }
+
+  return now;
+}
+
+void mg_pic32_if_sock_set(struct mg_connection *nc, sock_t sock) {
+  nc->sock = sock;
+}
+
+void mg_pic32_if_get_conn_addr(struct mg_connection *nc, int remote,
+                               union socket_address *sa) {
+  /* TODO(alaskin): not implemented yet */
+}
+
+void mg_pic32_if_connect_tcp(struct mg_connection *nc,
+                             const union socket_address *sa) {
+  nc->sock = TCPIP_TCP_ClientOpen(
+      sa->sin.sin_family == AF_INET ? IP_ADDRESS_TYPE_IPV4
+                                    : IP_ADDRESS_TYPE_IPV6,
+      ntohs(sa->sin.sin_port), (IP_MULTI_ADDRESS *) &sa->sin);
+  nc->err = (nc->sock == INVALID_SOCKET) ? -1 : 0;
+}
+
+void mg_pic32_if_connect_udp(struct mg_connection *nc) {
+  nc->sock = TCPIP_UDP_ClientOpen(IP_ADDRESS_TYPE_ANY, 0, NULL);
+  nc->err = (nc->sock == INVALID_SOCKET) ? -1 : 0;
+}
+
+/* clang-format off */
+#define MG_PIC32_IFACE_VTABLE                                   \
+  {                                                             \
+    mg_pic32_if_init,                                           \
+    mg_pic32_if_free,                                           \
+    mg_pic32_if_add_conn,                                       \
+    mg_pic32_if_remove_conn,                                    \
+    mg_pic32_if_poll,                                           \
+    mg_pic32_if_listen_tcp,                                     \
+    mg_pic32_if_listen_udp,                                     \
+    mg_pic32_if_connect_tcp,                                    \
+    mg_pic32_if_connect_udp,                                    \
+    mg_pic32_if_tcp_send,                                       \
+    mg_pic32_if_udp_send,                                       \
+    mg_pic32_if_recved,                                         \
+    mg_pic32_if_create_conn,                                    \
+    mg_pic32_if_destroy_conn,                                   \
+    mg_pic32_if_sock_set,                                       \
+    mg_pic32_if_get_conn_addr,                                  \
+  }
+/* clang-format on */
+
+struct mg_iface_vtable mg_pic32_iface_vtable = MG_PIC32_IFACE_VTABLE;
+#if MG_NET_IF == MG_NET_IF_PIC32
+struct mg_iface_vtable mg_default_iface_vtable = MG_PIC32_IFACE_VTABLE;
+#endif
+
+#endif /* MG_ENABLE_NET_IF_PIC32 */

mongoose.h

@@ -0,0 +1,5835 @@
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/common.h"
+#endif
+/*
+ * Copyright (c) 2004-2013 Sergey Lyubka
+ * Copyright (c) 2013-2015 Cesanta Software Limited
+ * All rights reserved
+ *
+ * This software is dual-licensed: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation. For the terms of this
+ * license, see <http://www.gnu.org/licenses/>.
+ *
+ * You are free to use this software under the terms of the GNU General
+ * Public License, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * Alternatively, you can license this software under a commercial
+ * license, as set out in <https://www.cesanta.com/license>.
+ */
+
+#ifndef CS_MONGOOSE_SRC_COMMON_H_
+#define CS_MONGOOSE_SRC_COMMON_H_
+
+#define MG_VERSION "6.7"
+
+/* Local tweaks, applied before any of Mongoose's own headers. */
+#ifdef MG_LOCALS
+#include <mg_locals.h>
+#endif
+
+#endif /* CS_MONGOOSE_SRC_COMMON_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platform.h"
+#endif
+#ifndef CS_COMMON_PLATFORM_H_
+#define CS_COMMON_PLATFORM_H_
+
+/*
+ * For the "custom" platform, includes and dependencies can be
+ * provided through mg_locals.h.
+ */
+#define CS_P_CUSTOM 0
+#define CS_P_UNIX 1
+#define CS_P_WINDOWS 2
+#define CS_P_ESP32 15
+#define CS_P_ESP8266 3
+#define CS_P_CC3200 4
+#define CS_P_MSP432 5
+#define CS_P_CC3100 6
+#define CS_P_TM4C129 14
+#define CS_P_MBED 7
+#define CS_P_WINCE 8
+#define CS_P_NXP_LPC 13
+#define CS_P_NXP_KINETIS 9
+#define CS_P_NRF51 12
+#define CS_P_NRF52 10
+#define CS_P_PIC32 11
+#define CS_P_STM32 16
+/* Next id: 17 */
+
+/* If not specified explicitly, we guess platform by defines. */
+#ifndef CS_PLATFORM
+
+#if defined(TARGET_IS_MSP432P4XX) || defined(__MSP432P401R__)
+#define CS_PLATFORM CS_P_MSP432
+#elif defined(cc3200)
+#define CS_PLATFORM CS_P_CC3200
+#elif defined(__unix__) || defined(__APPLE__)
+#define CS_PLATFORM CS_P_UNIX
+#elif defined(WINCE)
+#define CS_PLATFORM CS_P_WINCE
+#elif defined(_WIN32)
+#define CS_PLATFORM CS_P_WINDOWS
+#elif defined(__MBED__)
+#define CS_PLATFORM CS_P_MBED
+#elif defined(__USE_LPCOPEN)
+#define CS_PLATFORM CS_P_NXP_LPC
+#elif defined(FRDM_K64F) || defined(FREEDOM)
+#define CS_PLATFORM CS_P_NXP_KINETIS
+#elif defined(PIC32)
+#define CS_PLATFORM CS_P_PIC32
+#elif defined(ESP_PLATFORM)
+#define CS_PLATFORM CS_P_ESP32
+#elif defined(ICACHE_FLASH)
+#define CS_PLATFORM CS_P_ESP8266
+#elif defined(TARGET_IS_TM4C129_RA0) || defined(TARGET_IS_TM4C129_RA1) || \
+    defined(TARGET_IS_TM4C129_RA2)
+#define CS_PLATFORM CS_P_TM4C129
+#elif defined(STM32)
+#define CS_PLATFORM CS_P_STM32
+#endif
+
+#ifndef CS_PLATFORM
+#error "CS_PLATFORM is not specified and we couldn't guess it."
+#endif
+
+#endif /* !defined(CS_PLATFORM) */
+
+#define MG_NET_IF_SOCKET 1
+#define MG_NET_IF_SIMPLELINK 2
+#define MG_NET_IF_LWIP_LOW_LEVEL 3
+#define MG_NET_IF_PIC32 4
+
+#define MG_SSL_IF_OPENSSL 1
+#define MG_SSL_IF_MBEDTLS 2
+#define MG_SSL_IF_SIMPLELINK 3
+
+/* Amalgamated: #include "common/platforms/platform_unix.h" */
+/* Amalgamated: #include "common/platforms/platform_windows.h" */
+/* Amalgamated: #include "common/platforms/platform_esp32.h" */
+/* Amalgamated: #include "common/platforms/platform_esp8266.h" */
+/* Amalgamated: #include "common/platforms/platform_cc3200.h" */
+/* Amalgamated: #include "common/platforms/platform_cc3100.h" */
+/* Amalgamated: #include "common/platforms/platform_mbed.h" */
+/* Amalgamated: #include "common/platforms/platform_nrf51.h" */
+/* Amalgamated: #include "common/platforms/platform_nrf52.h" */
+/* Amalgamated: #include "common/platforms/platform_wince.h" */
+/* Amalgamated: #include "common/platforms/platform_nxp_lpc.h" */
+/* Amalgamated: #include "common/platforms/platform_nxp_kinetis.h" */
+/* Amalgamated: #include "common/platforms/platform_pic32.h" */
+/* Amalgamated: #include "common/platforms/platform_stm32.h" */
+
+/* Common stuff */
+
+#if !defined(WEAK)
+#if (defined(__GNUC__) || defined(__TI_COMPILER_VERSION__)) && !defined(_WIN32)
+#define WEAK __attribute__((weak))
+#elif defined (__IAR_SYSTEMS_ICC__)     /* for IAR Compiler */
+#define WEAK __weak
+#else
+#define WEAK
+#endif
+#endif
+
+#ifdef __GNUC__
+#define NORETURN __attribute__((noreturn))
+#define NOINLINE __attribute__((noinline))
+#define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
+#define NOINSTR __attribute__((no_instrument_function))
+#define DO_NOT_WARN_UNUSED __attribute__((unused))
+#else
+#define NORETURN
+#define NOINLINE
+#define WARN_UNUSED_RESULT
+#define NOINSTR
+#define DO_NOT_WARN_UNUSED
+#endif /* __GNUC__ */
+
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
+#endif
+
+#endif /* CS_COMMON_PLATFORM_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_windows.h"
+#endif
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_WINDOWS_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_WINDOWS_H_
+#if CS_PLATFORM == CS_P_WINDOWS
+
+/*
+ * MSVC++ 14.0 _MSC_VER == 1900 (Visual Studio 2015)
+ * MSVC++ 12.0 _MSC_VER == 1800 (Visual Studio 2013)
+ * MSVC++ 11.0 _MSC_VER == 1700 (Visual Studio 2012)
+ * MSVC++ 10.0 _MSC_VER == 1600 (Visual Studio 2010)
+ * MSVC++ 9.0  _MSC_VER == 1500 (Visual Studio 2008)
+ * MSVC++ 8.0  _MSC_VER == 1400 (Visual Studio 2005)
+ * MSVC++ 7.1  _MSC_VER == 1310 (Visual Studio 2003)
+ * MSVC++ 7.0  _MSC_VER == 1300
+ * MSVC++ 6.0  _MSC_VER == 1200
+ * MSVC++ 5.0  _MSC_VER == 1100
+ */
+#ifdef _MSC_VER
+#pragma warning(disable : 4127) /* FD_SET() emits warning, disable it */
+#pragma warning(disable : 4204) /* missing c99 support */
+#endif
+
+#ifndef _WINSOCK_DEPRECATED_NO_WARNINGS
+#define _WINSOCK_DEPRECATED_NO_WARNINGS 1
+#endif
+
+#ifndef _CRT_SECURE_NO_WARNINGS
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+
+#include <assert.h>
+#include <direct.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <io.h>
+#include <limits.h>
+#include <signal.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <time.h>
+
+#ifdef _MSC_VER
+#pragma comment(lib, "ws2_32.lib") /* Linking with winsock library */
+#endif
+
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#include <windows.h>
+#include <process.h>
+
+#if defined(_MSC_VER) && _MSC_VER >= 1800
+#define strdup _strdup
+#endif
+
+#ifndef EINPROGRESS
+#define EINPROGRESS WSAEINPROGRESS
+#endif
+#ifndef EWOULDBLOCK
+#define EWOULDBLOCK WSAEWOULDBLOCK
+#endif
+#ifndef __func__
+#define STRX(x) #x
+#define STR(x) STRX(x)
+#define __func__ __FILE__ ":" STR(__LINE__)
+#endif
+#define snprintf _snprintf
+#define fileno _fileno
+#define vsnprintf _vsnprintf
+#define sleep(x) Sleep((x) *1000)
+#define to64(x) _atoi64(x)
+#if !defined(__MINGW32__) && !defined(__MINGW64__)
+#define popen(x, y) _popen((x), (y))
+#define pclose(x) _pclose(x)
+#endif
+#define rmdir _rmdir
+#if defined(_MSC_VER) && _MSC_VER >= 1400
+#define fseeko(x, y, z) _fseeki64((x), (y), (z))
+#else
+#define fseeko(x, y, z) fseek((x), (y), (z))
+#endif
+#if defined(_MSC_VER) && _MSC_VER <= 1200
+typedef unsigned long uintptr_t;
+typedef long intptr_t;
+#endif
+typedef int socklen_t;
+#if _MSC_VER >= 1700
+#include <stdint.h>
+#else
+typedef signed char int8_t;
+typedef unsigned char uint8_t;
+typedef int int32_t;
+typedef unsigned int uint32_t;
+typedef short int16_t;
+typedef unsigned short uint16_t;
+typedef __int64 int64_t;
+typedef unsigned __int64 uint64_t;
+#endif
+typedef SOCKET sock_t;
+typedef uint32_t in_addr_t;
+#ifndef UINT16_MAX
+#define UINT16_MAX 65535
+#endif
+#ifndef UINT32_MAX
+#define UINT32_MAX 4294967295
+#endif
+#ifndef pid_t
+#define pid_t HANDLE
+#endif
+#define INT64_FMT "I64d"
+#define INT64_X_FMT "I64x"
+#define SIZE_T_FMT "Iu"
+typedef struct _stati64 cs_stat_t;
+#ifndef S_ISDIR
+#define S_ISDIR(x) (((x) &_S_IFMT) == _S_IFDIR)
+#endif
+#ifndef S_ISREG
+#define S_ISREG(x) (((x) &_S_IFMT) == _S_IFREG)
+#endif
+#define DIRSEP '\\'
+#define CS_DEFINE_DIRENT
+
+#ifndef va_copy
+#ifdef __va_copy
+#define va_copy __va_copy
+#else
+#define va_copy(x, y) (x) = (y)
+#endif
+#endif
+
+#ifndef MG_MAX_HTTP_REQUEST_SIZE
+#define MG_MAX_HTTP_REQUEST_SIZE 8192
+#endif
+
+#ifndef MG_MAX_HTTP_SEND_MBUF
+#define MG_MAX_HTTP_SEND_MBUF 4096
+#endif
+
+#ifndef MG_MAX_HTTP_HEADERS
+#define MG_MAX_HTTP_HEADERS 40
+#endif
+
+#ifndef CS_ENABLE_STDIO
+#define CS_ENABLE_STDIO 1
+#endif
+
+#ifndef MG_ENABLE_BROADCAST
+#define MG_ENABLE_BROADCAST 1
+#endif
+
+#ifndef MG_ENABLE_DIRECTORY_LISTING
+#define MG_ENABLE_DIRECTORY_LISTING 1
+#endif
+
+#ifndef MG_ENABLE_FILESYSTEM
+#define MG_ENABLE_FILESYSTEM 1
+#endif
+
+#ifndef MG_ENABLE_HTTP_CGI
+#define MG_ENABLE_HTTP_CGI MG_ENABLE_FILESYSTEM
+#endif
+
+#ifndef MG_NET_IF
+#define MG_NET_IF MG_NET_IF_SOCKET
+#endif
+
+#endif /* CS_PLATFORM == CS_P_WINDOWS */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_WINDOWS_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_unix.h"
+#endif
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_UNIX_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_UNIX_H_
+#if CS_PLATFORM == CS_P_UNIX
+
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 600
+#endif
+
+/* <inttypes.h> wants this for C++ */
+#ifndef __STDC_FORMAT_MACROS
+#define __STDC_FORMAT_MACROS
+#endif
+
+/* C++ wants that for INT64_MAX */
+#ifndef __STDC_LIMIT_MACROS
+#define __STDC_LIMIT_MACROS
+#endif
+
+/* Enable fseeko() and ftello() functions */
+#ifndef _LARGEFILE_SOURCE
+#define _LARGEFILE_SOURCE
+#endif
+
+/* Enable 64-bit file offsets */
+#ifndef _FILE_OFFSET_BITS
+#define _FILE_OFFSET_BITS 64
+#endif
+
+#include <arpa/inet.h>
+#include <assert.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <limits.h>
+#include <math.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/select.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#ifdef __APPLE__
+#include <machine/endian.h>
+#ifndef BYTE_ORDER
+#define LITTLE_ENDIAN __DARWIN_LITTLE_ENDIAN
+#define BIG_ENDIAN __DARWIN_BIG_ENDIAN
+#define PDP_ENDIAN __DARWIN_PDP_ENDIAN
+#define BYTE_ORDER __DARWIN_BYTE_ORDER
+#endif
+#endif
+
+/*
+ * osx correctly avoids defining strtoll when compiling in strict ansi mode.
+ * c++ 11 standard defines strtoll as well.
+ * We require strtoll, and if your embedded pre-c99 compiler lacks one, please
+ * implement a shim.
+ */
+#if !(defined(__cplusplus) && __cplusplus >= 201103L) && \
+    !(defined(__DARWIN_C_LEVEL) && __DARWIN_C_LEVEL >= 200809L)
+long long strtoll(const char *, char **, int);
+#endif
+
+typedef int sock_t;
+#define INVALID_SOCKET (-1)
+#define SIZE_T_FMT "zu"
+typedef struct stat cs_stat_t;
+#define DIRSEP '/'
+#define to64(x) strtoll(x, NULL, 10)
+#define INT64_FMT PRId64
+#define INT64_X_FMT PRIx64
+
+#ifndef __cdecl
+#define __cdecl
+#endif
+
+#ifndef va_copy
+#ifdef __va_copy
+#define va_copy __va_copy
+#else
+#define va_copy(x, y) (x) = (y)
+#endif
+#endif
+
+#define closesocket(x) close(x)
+
+#ifndef MG_MAX_HTTP_REQUEST_SIZE
+#define MG_MAX_HTTP_REQUEST_SIZE 8192
+#endif
+
+#ifndef MG_MAX_HTTP_SEND_MBUF
+#define MG_MAX_HTTP_SEND_MBUF 4096
+#endif
+
+#ifndef MG_MAX_HTTP_HEADERS
+#define MG_MAX_HTTP_HEADERS 40
+#endif
+
+#ifndef CS_ENABLE_STDIO
+#define CS_ENABLE_STDIO 1
+#endif
+
+#ifndef MG_ENABLE_BROADCAST
+#define MG_ENABLE_BROADCAST 1
+#endif
+
+#ifndef MG_ENABLE_DIRECTORY_LISTING
+#define MG_ENABLE_DIRECTORY_LISTING 1
+#endif
+
+#ifndef MG_ENABLE_FILESYSTEM
+#define MG_ENABLE_FILESYSTEM 1
+#endif
+
+#ifndef MG_ENABLE_HTTP_CGI
+#define MG_ENABLE_HTTP_CGI MG_ENABLE_FILESYSTEM
+#endif
+
+#ifndef MG_NET_IF
+#define MG_NET_IF MG_NET_IF_SOCKET
+#endif
+
+#endif /* CS_PLATFORM == CS_P_UNIX */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_UNIX_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_esp32.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_ESP32_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_ESP32_H_
+#if CS_PLATFORM == CS_P_ESP32
+
+#include <assert.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <machine/endian.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+
+#define SIZE_T_FMT "u"
+typedef struct stat cs_stat_t;
+#define DIRSEP '/'
+#define to64(x) strtoll(x, NULL, 10)
+#define INT64_FMT PRId64
+#define INT64_X_FMT PRIx64
+#define __cdecl
+#define _FILE_OFFSET_BITS 32
+
+#define MG_LWIP 1
+
+#ifndef MG_NET_IF
+#define MG_NET_IF MG_NET_IF_SOCKET
+#endif
+
+#ifndef CS_ENABLE_STDIO
+#define CS_ENABLE_STDIO 1
+#endif
+
+#endif /* CS_PLATFORM == CS_P_ESP32 */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_ESP32_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_esp8266.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_ESP8266_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_ESP8266_H_
+#if CS_PLATFORM == CS_P_ESP8266
+
+#include <assert.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <machine/endian.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+
+#define SIZE_T_FMT "u"
+typedef struct stat cs_stat_t;
+#define DIRSEP '/'
+#define CS_DEFINE_DIRENT
+
+#define to64(x) strtoll(x, NULL, 10)
+#define INT64_FMT PRId64
+#define INT64_X_FMT PRIx64
+#define __cdecl
+#define _FILE_OFFSET_BITS 32
+
+#ifndef RTOS_SDK
+#define fileno(x) -1
+#endif
+
+#define MG_LWIP 1
+
+/* struct timeval is defined in sys/time.h. */
+#define LWIP_TIMEVAL_PRIVATE 0
+
+#ifndef MG_NET_IF
+#include <lwip/opt.h>
+#if LWIP_SOCKET /* RTOS SDK has LWIP sockets */
+#  define MG_NET_IF MG_NET_IF_SOCKET
+#else
+#  define MG_NET_IF MG_NET_IF_LWIP_LOW_LEVEL
+#endif
+#endif
+
+#ifndef CS_ENABLE_STDIO
+#define CS_ENABLE_STDIO 1
+#endif
+
+#endif /* CS_PLATFORM == CS_P_ESP8266 */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_ESP8266_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_cc3100.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_CC3100_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_CC3100_H_
+#if CS_PLATFORM == CS_P_CC3100
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <string.h>
+#include <time.h>
+
+#define MG_NET_IF MG_NET_IF_SIMPLELINK
+#define MG_SSL_IF MG_SSL_IF_SIMPLELINK
+
+/*
+ * CC3100 SDK and STM32 SDK include headers w/out path, just like
+ * #include "simplelink.h". As result, we have to add all required directories
+ * into Makefile IPATH and do the same thing (include w/out path)
+ */
+
+#include <simplelink.h>
+#include <netapp.h>
+#undef timeval 
+
+typedef int sock_t;
+#define INVALID_SOCKET (-1)
+
+#define to64(x) strtoll(x, NULL, 10)
+#define INT64_FMT PRId64
+#define INT64_X_FMT PRIx64
+#define SIZE_T_FMT "u"
+
+#define SOMAXCONN 8
+
+const char *inet_ntop(int af, const void *src, char *dst, socklen_t size);
+char *inet_ntoa(struct in_addr in);
+int inet_pton(int af, const char *src, void *dst);
+
+#endif /* CS_PLATFORM == CS_P_CC3100 */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_CC3100_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_cc3200.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_CC3200_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_CC3200_H_
+#if CS_PLATFORM == CS_P_CC3200
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <string.h>
+#include <time.h>
+
+#ifndef __TI_COMPILER_VERSION__
+#include <fcntl.h>
+#include <sys/time.h>
+#endif
+
+#define MG_NET_IF MG_NET_IF_SIMPLELINK
+#define MG_SSL_IF MG_SSL_IF_SIMPLELINK
+
+/* Only SPIFFS supports directories, SLFS does not. */
+#if defined(CC3200_FS_SPIFFS) && !defined(MG_ENABLE_DIRECTORY_LISTING)
+#define MG_ENABLE_DIRECTORY_LISTING 1
+#endif
+
+/* Amalgamated: #include "common/platforms/simplelink/cs_simplelink.h" */
+
+typedef int sock_t;
+#define INVALID_SOCKET (-1)
+#define SIZE_T_FMT "u"
+typedef struct stat cs_stat_t;
+#define DIRSEP '/'
+#define to64(x) strtoll(x, NULL, 10)
+#define INT64_FMT PRId64
+#define INT64_X_FMT PRIx64
+#define __cdecl
+
+#define fileno(x) -1
+
+/* Some functions we implement for Mongoose. */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __TI_COMPILER_VERSION__
+struct SlTimeval_t;
+#define timeval SlTimeval_t
+int gettimeofday(struct timeval *t, void *tz);
+
+int asprintf(char **strp, const char *fmt, ...);
+
+#endif
+
+/* TI's libc does not have stat & friends, add them. */
+#ifdef __TI_COMPILER_VERSION__
+
+#include <file.h>
+
+typedef unsigned int mode_t;
+typedef size_t _off_t;
+typedef long ssize_t;
+
+struct stat {
+  int st_ino;
+  mode_t st_mode;
+  int st_nlink;
+  time_t st_mtime;
+  off_t st_size;
+};
+
+int _stat(const char *pathname, struct stat *st);
+#define stat(a, b) _stat(a, b)
+
+#define __S_IFMT 0170000
+
+#define __S_IFDIR 0040000
+#define __S_IFCHR 0020000
+#define __S_IFREG 0100000
+
+#define __S_ISTYPE(mode, mask) (((mode) &__S_IFMT) == (mask))
+
+#define S_IFDIR __S_IFDIR
+#define S_IFCHR __S_IFCHR
+#define S_IFREG __S_IFREG
+#define S_ISDIR(mode) __S_ISTYPE((mode), __S_IFDIR)
+#define S_ISREG(mode) __S_ISTYPE((mode), __S_IFREG)
+
+/* As of 5.2.7, TI compiler does not support va_copy() yet. */
+#define va_copy(apc, ap) ((apc) = (ap))
+
+#endif /* __TI_COMPILER_VERSION__ */
+
+#ifdef CC3200_FS_SLFS
+#define MG_FS_SLFS
+#endif
+
+#if (defined(CC3200_FS_SPIFFS) || defined(CC3200_FS_SLFS)) && \
+    !defined(MG_ENABLE_FILESYSTEM)
+#define MG_ENABLE_FILESYSTEM 1
+#define CS_DEFINE_DIRENT
+#endif
+
+#ifndef CS_ENABLE_STDIO
+#define CS_ENABLE_STDIO 1
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CS_PLATFORM == CS_P_CC3200 */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_CC3200_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_msp432.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_MSP432_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_MSP432_H_
+#if CS_PLATFORM == CS_P_MSP432
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <string.h>
+#include <time.h>
+
+#ifndef __TI_COMPILER_VERSION__
+#include <fcntl.h>
+#include <sys/time.h>
+#endif
+
+#define MG_NET_IF MG_NET_IF_SIMPLELINK
+#define MG_SSL_IF MG_SSL_IF_SIMPLELINK
+
+/* Amalgamated: #include "common/platforms/simplelink/cs_simplelink.h" */
+
+typedef int sock_t;
+#define INVALID_SOCKET (-1)
+#define SIZE_T_FMT "u"
+typedef struct stat cs_stat_t;
+#define DIRSEP '/'
+#define to64(x) strtoll(x, NULL, 10)
+#define INT64_FMT PRId64
+#define INT64_X_FMT PRIx64
+#define __cdecl
+
+#define fileno(x) -1
+
+/* Some functions we implement for Mongoose. */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __TI_COMPILER_VERSION__
+struct SlTimeval_t;
+#define timeval SlTimeval_t
+int gettimeofday(struct timeval *t, void *tz);
+#endif
+
+/* TI's libc does not have stat & friends, add them. */
+#ifdef __TI_COMPILER_VERSION__
+
+#include <file.h>
+
+typedef unsigned int mode_t;
+typedef size_t _off_t;
+typedef long ssize_t;
+
+struct stat {
+  int st_ino;
+  mode_t st_mode;
+  int st_nlink;
+  time_t st_mtime;
+  off_t st_size;
+};
+
+int _stat(const char *pathname, struct stat *st);
+#define stat(a, b) _stat(a, b)
+
+#define __S_IFMT 0170000
+
+#define __S_IFDIR 0040000
+#define __S_IFCHR 0020000
+#define __S_IFREG 0100000
+
+#define __S_ISTYPE(mode, mask) (((mode) &__S_IFMT) == (mask))
+
+#define S_IFDIR __S_IFDIR
+#define S_IFCHR __S_IFCHR
+#define S_IFREG __S_IFREG
+#define S_ISDIR(mode) __S_ISTYPE((mode), __S_IFDIR)
+#define S_ISREG(mode) __S_ISTYPE((mode), __S_IFREG)
+
+/* As of 5.2.7, TI compiler does not support va_copy() yet. */
+#define va_copy(apc, ap) ((apc) = (ap))
+
+#endif /* __TI_COMPILER_VERSION__ */
+
+#ifndef CS_ENABLE_STDIO
+#define CS_ENABLE_STDIO 1
+#endif
+
+#if (defined(CC3200_FS_SPIFFS) || defined(CC3200_FS_SLFS)) && !defined(MG_ENABLE_FILESYSTEM)
+#define MG_ENABLE_FILESYSTEM 1
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CS_PLATFORM == CS_P_MSP432 */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_MSP432_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_tm4c129.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_TM4C129_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_TM4C129_H_
+#if CS_PLATFORM == CS_P_TM4C129
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <string.h>
+#include <time.h>
+
+#ifndef __TI_COMPILER_VERSION__
+#include <fcntl.h>
+#include <sys/time.h>
+#endif
+
+#define SIZE_T_FMT "u"
+typedef struct stat cs_stat_t;
+#define DIRSEP '/'
+#define to64(x) strtoll(x, NULL, 10)
+#define INT64_FMT PRId64
+#define INT64_X_FMT PRIx64
+#define __cdecl
+
+#ifndef MG_NET_IF
+#  include <lwip/opt.h>
+#  if LWIP_SOCKET
+#    define MG_NET_IF MG_NET_IF_SOCKET
+#  else
+#    define MG_NET_IF MG_NET_IF_LWIP_LOW_LEVEL
+#  endif
+#  define MG_LWIP 1
+#elif MG_NET_IF == MG_NET_IF_SIMPLELINK
+#  include "common/platforms/simplelink/cs_simplelink.h"
+#endif
+
+#ifndef CS_ENABLE_STDIO
+#define CS_ENABLE_STDIO 1
+#endif
+
+#ifdef __TI_COMPILER_VERSION__
+/* As of 5.2.8, TI compiler does not support va_copy() yet. */
+#define va_copy(apc, ap) ((apc) = (ap))
+#endif /* __TI_COMPILER_VERSION__ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CS_PLATFORM == CS_P_TM4C129 */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_TM4C129_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_mbed.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_MBED_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_MBED_H_
+#if CS_PLATFORM == CS_P_MBED
+
+/*
+ * mbed.h contains C++ code (e.g. templates), thus, it should be processed
+ * only if included directly to startup file (ex: main.cpp)
+ */
+#ifdef __cplusplus
+/* Amalgamated: #include "mbed.h" */
+#endif /* __cplusplus */
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <string.h>
+#include <time.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <stdio.h>
+
+typedef struct stat cs_stat_t;
+#define DIRSEP '/'
+
+#ifndef CS_ENABLE_STDIO
+#define CS_ENABLE_STDIO 1
+#endif
+
+/*
+ * mbed can be compiled with the ARM compiler which
+ * just doesn't come with a gettimeofday shim
+ * because it's a BSD API and ARM targets embedded
+ * non-unix platforms.
+ */
+#if defined(__ARMCC_VERSION) || defined(__ICCARM__)
+#define _TIMEVAL_DEFINED
+#define gettimeofday _gettimeofday
+
+/* copied from GCC on ARM; for some reason useconds are signed */
+typedef long suseconds_t; /* microseconds (signed) */
+struct timeval {
+  time_t tv_sec;       /* seconds */
+  suseconds_t tv_usec; /* and microseconds */
+};
+
+#endif
+
+#if MG_NET_IF == MG_NET_IF_SIMPLELINK
+
+#define MG_SIMPLELINK_NO_OSI 1
+
+#include <simplelink.h>
+
+typedef int sock_t;
+#define INVALID_SOCKET (-1)
+
+#define to64(x) strtoll(x, NULL, 10)
+#define INT64_FMT PRId64
+#define INT64_X_FMT PRIx64
+#define SIZE_T_FMT "u"
+
+#define SOMAXCONN 8
+
+const char *inet_ntop(int af, const void *src, char *dst, socklen_t size);
+char *inet_ntoa(struct in_addr in);
+int inet_pton(int af, const char *src, void *dst);
+int inet_aton(const char *cp, struct in_addr *inp);
+in_addr_t inet_addr(const char *cp);
+
+#endif /* MG_NET_IF == MG_NET_IF_SIMPLELINK */
+
+#endif /* CS_PLATFORM == CS_P_MBED */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_MBED_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_nrf51.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_NRF51_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_NRF51_H_
+#if CS_PLATFORM == CS_P_NRF51
+
+#include <assert.h>
+#include <ctype.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <string.h>
+#include <time.h>
+
+#define to64(x) strtoll(x, NULL, 10)
+
+#define MG_NET_IF             MG_NET_IF_LWIP_LOW_LEVEL
+#define MG_LWIP               1
+#define MG_ENABLE_IPV6        1
+
+/*
+ * For ARM C Compiler, make lwip to export `struct timeval`; for other
+ * compilers, suppress it.
+ */
+#if !defined(__ARMCC_VERSION)
+# define LWIP_TIMEVAL_PRIVATE  0
+#else
+struct timeval;
+int gettimeofday(struct timeval *tp, void *tzp);
+#endif
+
+#define INT64_FMT PRId64
+#define SIZE_T_FMT "u"
+
+/*
+ * ARM C Compiler doesn't have strdup, so we provide it
+ */
+#define CS_ENABLE_STRDUP defined(__ARMCC_VERSION)
+
+#endif /* CS_PLATFORM == CS_P_NRF51 */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_NRF51_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_nrf52.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_NRF52_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_NRF52_H_
+#if CS_PLATFORM == CS_P_NRF52
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <string.h>
+#include <time.h>
+
+#define to64(x) strtoll(x, NULL, 10)
+
+#define MG_NET_IF             MG_NET_IF_LWIP_LOW_LEVEL
+#define MG_LWIP               1
+#define MG_ENABLE_IPV6        1
+
+#if !defined(ENOSPC)
+# define ENOSPC 28  /* No space left on device */
+#endif
+
+/*
+ * For ARM C Compiler, make lwip to export `struct timeval`; for other
+ * compilers, suppress it.
+ */
+#if !defined(__ARMCC_VERSION)
+# define LWIP_TIMEVAL_PRIVATE  0
+#endif
+
+#define INT64_FMT PRId64
+#define SIZE_T_FMT "u"
+
+/*
+ * ARM C Compiler doesn't have strdup, so we provide it
+ */
+#define CS_ENABLE_STRDUP defined(__ARMCC_VERSION)
+
+#endif /* CS_PLATFORM == CS_P_NRF52 */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_NRF52_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/simplelink/cs_simplelink.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_SIMPLELINK_CS_SIMPLELINK_H_
+#define CS_COMMON_PLATFORMS_SIMPLELINK_CS_SIMPLELINK_H_
+
+/* If simplelink.h is already included, all bets are off. */
+#if defined(MG_NET_IF) && MG_NET_IF == MG_NET_IF_SIMPLELINK && \
+    !defined(__SIMPLELINK_H__)
+
+#include <stdbool.h>
+
+#ifndef __TI_COMPILER_VERSION__
+#undef __CONCAT
+#undef FD_CLR
+#undef FD_ISSET
+#undef FD_SET
+#undef FD_SETSIZE
+#undef FD_ZERO
+#undef fd_set
+#endif
+
+/* We want to disable SL_INC_STD_BSD_API_NAMING, so we include user.h ourselves
+ * and undef it. */
+#define PROVISIONING_API_H_
+#include <simplelink/user.h>
+#undef PROVISIONING_API_H_
+#undef SL_INC_STD_BSD_API_NAMING
+
+#include <simplelink/include/simplelink.h>
+#include <simplelink/include/netapp.h>
+
+/* Now define only the subset of the BSD API that we use.
+ * Notably, close(), read() and write() are not defined. */
+#define AF_INET SL_AF_INET
+
+#define socklen_t SlSocklen_t
+#define sockaddr SlSockAddr_t
+#define sockaddr_in SlSockAddrIn_t
+#define in_addr SlInAddr_t
+
+#define SOCK_STREAM SL_SOCK_STREAM
+#define SOCK_DGRAM SL_SOCK_DGRAM
+
+#define htonl sl_Htonl
+#define ntohl sl_Ntohl
+#define htons sl_Htons
+#define ntohs sl_Ntohs
+
+#ifndef EACCES
+#define EACCES SL_EACCES
+#endif
+#ifndef EAFNOSUPPORT
+#define EAFNOSUPPORT SL_EAFNOSUPPORT
+#endif
+#ifndef EAGAIN
+#define EAGAIN SL_EAGAIN
+#endif
+#ifndef EBADF
+#define EBADF SL_EBADF
+#endif
+#ifndef EINVAL
+#define EINVAL SL_EINVAL
+#endif
+#ifndef ENOMEM
+#define ENOMEM SL_ENOMEM
+#endif
+#ifndef EWOULDBLOCK
+#define EWOULDBLOCK SL_EWOULDBLOCK
+#endif
+
+#define SOMAXCONN 8
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+const char *inet_ntop(int af, const void *src, char *dst, socklen_t size);
+char *inet_ntoa(struct in_addr in);
+int inet_pton(int af, const char *src, void *dst);
+
+struct mg_mgr;
+struct mg_connection;
+
+typedef void (*mg_init_cb)(struct mg_mgr *mgr);
+bool mg_start_task(int priority, int stack_size, mg_init_cb mg_init);
+
+void mg_run_in_task(void (*cb)(struct mg_mgr *mgr, void *arg), void *cb_arg);
+
+int sl_fs_init(void);
+
+void sl_restart_cb(struct mg_mgr *mgr);
+
+int sl_set_ssl_opts(struct mg_connection *nc);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MG_NET_IF == MG_NET_IF_SIMPLELINK && !defined(__SIMPLELINK_H__) */
+
+#endif /* CS_COMMON_PLATFORMS_SIMPLELINK_CS_SIMPLELINK_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_wince.h"
+#endif
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_WINCE_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_WINCE_H_
+
+#if CS_PLATFORM == CS_P_WINCE
+
+/*
+ * MSVC++ 14.0 _MSC_VER == 1900 (Visual Studio 2015)
+ * MSVC++ 12.0 _MSC_VER == 1800 (Visual Studio 2013)
+ * MSVC++ 11.0 _MSC_VER == 1700 (Visual Studio 2012)
+ * MSVC++ 10.0 _MSC_VER == 1600 (Visual Studio 2010)
+ * MSVC++ 9.0  _MSC_VER == 1500 (Visual Studio 2008)
+ * MSVC++ 8.0  _MSC_VER == 1400 (Visual Studio 2005)
+ * MSVC++ 7.1  _MSC_VER == 1310 (Visual Studio 2003)
+ * MSVC++ 7.0  _MSC_VER == 1300
+ * MSVC++ 6.0  _MSC_VER == 1200
+ * MSVC++ 5.0  _MSC_VER == 1100
+ */
+#pragma warning(disable : 4127) /* FD_SET() emits warning, disable it */
+#pragma warning(disable : 4204) /* missing c99 support */
+
+#ifndef _WINSOCK_DEPRECATED_NO_WARNINGS
+#define _WINSOCK_DEPRECATED_NO_WARNINGS 1
+#endif
+
+#ifndef _CRT_SECURE_NO_WARNINGS
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+
+#include <assert.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#pragma comment(lib, "ws2.lib") /* Linking with WinCE winsock library */
+
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#include <windows.h>
+
+#define strdup _strdup
+
+#ifndef EINPROGRESS
+#define EINPROGRESS WSAEINPROGRESS
+#endif
+
+#ifndef EWOULDBLOCK
+#define EWOULDBLOCK WSAEWOULDBLOCK
+#endif
+
+#ifndef __func__
+#define STRX(x) #x
+#define STR(x) STRX(x)
+#define __func__ __FILE__ ":" STR(__LINE__)
+#endif
+
+#define snprintf _snprintf
+#define fileno _fileno
+#define vsnprintf _vsnprintf
+#define sleep(x) Sleep((x) *1000)
+#define to64(x) _atoi64(x)
+#define rmdir _rmdir
+
+#if defined(_MSC_VER) && _MSC_VER >= 1400
+#define fseeko(x, y, z) _fseeki64((x), (y), (z))
+#else
+#define fseeko(x, y, z) fseek((x), (y), (z))
+#endif
+
+typedef int socklen_t;
+
+#if _MSC_VER >= 1700
+#include <stdint.h>
+#else
+typedef signed char int8_t;
+typedef unsigned char uint8_t;
+typedef int int32_t;
+typedef unsigned int uint32_t;
+typedef short int16_t;
+typedef unsigned short uint16_t;
+typedef __int64 int64_t;
+typedef unsigned __int64 uint64_t;
+#endif
+
+typedef SOCKET sock_t;
+typedef uint32_t in_addr_t;
+
+#ifndef UINT16_MAX
+#define UINT16_MAX 65535
+#endif
+
+#ifndef UINT32_MAX
+#define UINT32_MAX 4294967295
+#endif
+
+#ifndef pid_t
+#define pid_t HANDLE
+#endif
+
+#define INT64_FMT "I64d"
+#define INT64_X_FMT "I64x"
+/* TODO(alashkin): check if this is correct */
+#define SIZE_T_FMT "u"
+
+#define DIRSEP '\\'
+#define CS_DEFINE_DIRENT
+
+#ifndef va_copy
+#ifdef __va_copy
+#define va_copy __va_copy
+#else
+#define va_copy(x, y) (x) = (y)
+#endif
+#endif
+
+#ifndef MG_MAX_HTTP_REQUEST_SIZE
+#define MG_MAX_HTTP_REQUEST_SIZE 8192
+#endif
+
+#ifndef MG_MAX_HTTP_SEND_MBUF
+#define MG_MAX_HTTP_SEND_MBUF 4096
+#endif
+
+#ifndef MG_MAX_HTTP_HEADERS
+#define MG_MAX_HTTP_HEADERS 40
+#endif
+
+#ifndef CS_ENABLE_STDIO
+#define CS_ENABLE_STDIO 1
+#endif
+
+#define abort() DebugBreak();
+
+#ifndef BUFSIZ
+#define BUFSIZ 4096
+#endif
+/*
+ * Explicitly disabling MG_ENABLE_THREADS for WinCE
+ * because they are enabled for _WIN32 by default
+ */
+#ifndef MG_ENABLE_THREADS
+#define MG_ENABLE_THREADS 0
+#endif
+
+#ifndef MG_ENABLE_FILESYSTEM
+#define MG_ENABLE_FILESYSTEM 1
+#endif
+
+#ifndef MG_NET_IF
+#define MG_NET_IF MG_NET_IF_SOCKET
+#endif
+
+typedef struct _stati64 {
+  uint32_t st_mtime;
+  uint32_t st_size;
+  uint32_t st_mode;
+} cs_stat_t;
+
+/*
+ * WinCE 6.0 has a lot of useful definitions in ATL (not windows.h) headers
+ * use #ifdefs to avoid conflicts
+ */
+
+#ifndef ENOENT
+#define ENOENT ERROR_PATH_NOT_FOUND
+#endif
+
+#ifndef EACCES
+#define EACCES ERROR_ACCESS_DENIED
+#endif
+
+#ifndef ENOMEM
+#define ENOMEM ERROR_NOT_ENOUGH_MEMORY
+#endif
+
+#ifndef _UINTPTR_T_DEFINED
+typedef unsigned int* uintptr_t;
+#endif
+
+#define _S_IFREG 2
+#define _S_IFDIR 4
+
+#ifndef S_ISDIR
+#define S_ISDIR(x) (((x) & _S_IFDIR) != 0)
+#endif
+
+#ifndef S_ISREG
+#define S_ISREG(x) (((x) & _S_IFREG) != 0)
+#endif
+
+int open(const char *filename, int oflag, int pmode);
+int _wstati64(const wchar_t *path, cs_stat_t *st);
+const char *strerror();
+
+#endif /* CS_PLATFORM == CS_P_WINCE */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_WINCE_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_nxp_lpc.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_NXP_LPC_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_NXP_LPC_H_
+
+#if CS_PLATFORM == CS_P_NXP_LPC
+
+#include <ctype.h>
+#include <stdint.h>
+#include <string.h>
+
+#define SIZE_T_FMT "u"
+typedef struct stat cs_stat_t;
+#define INT64_FMT "lld"
+#define INT64_X_FMT "llx"
+#define __cdecl
+
+#define MG_LWIP 1
+
+#define MG_NET_IF MG_NET_IF_LWIP_LOW_LEVEL
+
+/*
+ * LPCXpress comes with 3 C library implementations: Newlib, NewlibNano and Redlib.
+ * See https://community.nxp.com/message/630860 for more details.
+ *
+ * Redlib is the default and lacks certain things, so we provide them.
+ */
+#ifdef __REDLIB_INTERFACE_VERSION__
+
+/* Let LWIP define timeval for us. */
+#define LWIP_TIMEVAL_PRIVATE 1
+
+#define va_copy(d, s) __builtin_va_copy(d, s)
+
+#define CS_ENABLE_TO64 1
+#define to64(x) cs_to64(x)
+
+#define CS_ENABLE_STRDUP 1
+
+#else
+
+#include <sys/time.h>
+#define LWIP_TIMEVAL_PRIVATE 0
+#define to64(x) strtoll(x, NULL, 10)
+
+#endif
+
+#endif /* CS_PLATFORM == CS_P_NXP_LPC */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_NXP_LPC_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_nxp_kinetis.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_NXP_KINETIS_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_NXP_KINETIS_H_
+
+#if CS_PLATFORM == CS_P_NXP_KINETIS
+
+#include <ctype.h>
+#include <inttypes.h>
+#include <string.h>
+#include <sys/time.h>
+
+#define SIZE_T_FMT "u"
+typedef struct stat cs_stat_t;
+#define to64(x) strtoll(x, NULL, 10)
+#define INT64_FMT "lld"
+#define INT64_X_FMT "llx"
+#define __cdecl
+
+#define MG_LWIP 1
+
+#define MG_NET_IF MG_NET_IF_LWIP_LOW_LEVEL
+
+/* struct timeval is defined in sys/time.h. */
+#define LWIP_TIMEVAL_PRIVATE 0
+
+#endif /* CS_PLATFORM == CS_P_NXP_KINETIS */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_NXP_KINETIS_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_pic32.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_PIC32_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_PIC32_H_
+
+#if CS_PLATFORM == CS_P_PIC32
+
+#define MG_NET_IF MG_NET_IF_PIC32
+
+#include <stdint.h>
+#include <time.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+#include <system_config.h>
+#include <system_definitions.h>
+
+#include <sys/types.h>
+
+typedef TCP_SOCKET sock_t;
+#define to64(x) strtoll(x, NULL, 10)
+
+#define SIZE_T_FMT "lu"
+#define INT64_FMT "lld"
+
+#ifndef CS_ENABLE_STDIO
+#define CS_ENABLE_STDIO 1
+#endif
+
+char* inet_ntoa(struct in_addr in);
+
+#endif /* CS_PLATFORM == CS_P_PIC32 */
+
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_PIC32_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/platform_stm32.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_PLATFORM_STM32_H_
+#define CS_COMMON_PLATFORMS_PLATFORM_STM32_H_
+#if CS_PLATFORM == CS_P_STM32
+
+//#include <sys/types.h>
+//#include <sys/stat.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <errno.h>
+//#include <memory.h>
+//#include <fcntl.h>
+//#include <stm32_sdk_hal.h>
+
+#define to64(x) strtoll(x, NULL, 10)
+#define INT64_FMT PRId64
+#define SIZE_T_FMT "u"
+typedef struct stat cs_stat_t;
+#define DIRSEP '/'
+
+#ifndef CS_ENABLE_STDIO
+#define CS_ENABLE_STDIO 1
+#endif
+
+#ifndef MG_ENABLE_FILESYSTEM
+#define MG_ENABLE_FILESYSTEM 1
+#endif
+
+#ifndef CS_DEFINE_DIRENT
+#define CS_DEFINE_DIRENT 1
+#endif
+
+#endif /* CS_PLATFORM == CS_P_STM32 */
+#endif /* CS_COMMON_PLATFORMS_PLATFORM_STM32_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/platforms/lwip/mg_lwip.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_PLATFORMS_LWIP_MG_LWIP_H_
+#define CS_COMMON_PLATFORMS_LWIP_MG_LWIP_H_
+
+#ifndef MG_LWIP
+#define MG_LWIP 0
+#endif
+
+#if MG_LWIP
+
+/*
+ * When compiling for nRF5x chips with arm-none-eabi-gcc, it has BYTE_ORDER
+ * already defined, so in order to avoid warnings in lwip, we have to undefine
+ * it.
+ *
+ * TODO: Check if in the future versions of nRF5 SDK that changes.
+ *       Current version of nRF51 SDK: 0.8.0
+ *                          nRF5 SDK:  0.9.0
+ */
+#if CS_PLATFORM == CS_P_NRF51 || CS_PLATFORM == CS_P_NRF52
+#undef BYTE_ORDER
+#endif
+
+#include <lwip/opt.h>
+#include <lwip/err.h>
+#include <lwip/ip_addr.h>
+#include <lwip/inet.h>
+#include <lwip/netdb.h>
+#include <lwip/dns.h>
+
+#ifndef LWIP_PROVIDE_ERRNO
+#include <errno.h>
+#endif
+
+#if LWIP_SOCKET
+#include <lwip/sockets.h>
+#else
+/* We really need the definitions from sockets.h. */
+#undef LWIP_SOCKET
+#define LWIP_SOCKET 1
+#include <lwip/sockets.h>
+#undef LWIP_SOCKET
+#define LWIP_SOCKET 0
+#endif
+
+#define INVALID_SOCKET (-1)
+#define SOMAXCONN 10
+typedef int sock_t;
+
+#if MG_NET_IF == MG_NET_IF_LWIP_LOW_LEVEL
+struct mg_mgr;
+struct mg_connection;
+uint32_t mg_lwip_get_poll_delay_ms(struct mg_mgr *mgr);
+void mg_lwip_set_keepalive_params(struct mg_connection *nc, int idle,
+                                  int interval, int count);
+#endif
+
+/* For older version of LWIP */
+#ifndef ipX_2_ip
+#define ipX_2_ip(x) (x)
+#endif
+
+#endif /* MG_LWIP */
+
+#endif /* CS_COMMON_PLATFORMS_LWIP_MG_LWIP_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/cs_time.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_CS_TIME_H_
+#define CS_COMMON_CS_TIME_H_
+
+/* Amalgamated: #include "common/platform.h" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* Sub-second granularity time(). */
+double cs_time(void);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* CS_COMMON_CS_TIME_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/mg_str.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_MG_STR_H_
+#define CS_COMMON_MG_STR_H_
+
+#include <stddef.h>
+
+/* Amalgamated: #include "common/platform.h" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* Describes chunk of memory */
+struct mg_str {
+  const char *p; /* Memory chunk pointer */
+  size_t len;    /* Memory chunk length */
+};
+
+/*
+ * Helper functions for creating mg_str struct from plain C string.
+ * `NULL` is allowed and becomes `{NULL, 0}`.
+ */
+struct mg_str mg_mk_str(const char *s);
+struct mg_str mg_mk_str_n(const char *s, size_t len);
+
+/* Macro for initializing mg_str. */
+#define MG_MK_STR(str_literal) \
+  { str_literal, sizeof(str_literal) - 1 }
+
+/*
+ * Cross-platform version of `strcmp()` where where first string is
+ * specified by `struct mg_str`.
+ */
+int mg_vcmp(const struct mg_str *str2, const char *str1);
+
+/*
+ * Cross-platform version of `strncasecmp()` where first string is
+ * specified by `struct mg_str`.
+ */
+int mg_vcasecmp(const struct mg_str *str2, const char *str1);
+
+struct mg_str mg_strdup(const struct mg_str s);
+int mg_strcmp(const struct mg_str str1, const struct mg_str str2);
+int mg_strncmp(const struct mg_str str1, const struct mg_str str2, size_t n);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* CS_COMMON_MG_STR_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/mbuf.h"
+#endif
+/*
+ * Copyright (c) 2015 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/*
+ * === Memory Buffers
+ *
+ * Mbufs are mutable/growing memory buffers, like C++ strings.
+ * Mbuf can append data to the end of a buffer or insert data into arbitrary
+ * position in the middle of a buffer. The buffer grows automatically when
+ * needed.
+ */
+
+#ifndef CS_COMMON_MBUF_H_
+#define CS_COMMON_MBUF_H_
+
+#include <stdlib.h>
+/* Amalgamated: #include "common/platform.h" */
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+#ifndef MBUF_SIZE_MULTIPLIER
+#define MBUF_SIZE_MULTIPLIER 1.5
+#endif
+
+/* Memory buffer descriptor */
+struct mbuf {
+  char *buf;   /* Buffer pointer */
+  size_t len;  /* Data length. Data is located between offset 0 and len. */
+  size_t size; /* Buffer size allocated by realloc(1). Must be >= len */
+};
+
+/*
+ * Initialises an Mbuf.
+ * `initial_capacity` specifies the initial capacity of the mbuf.
+ */
+void mbuf_init(struct mbuf *, size_t initial_capacity);
+
+/* Frees the space allocated for the mbuffer and resets the mbuf structure. */
+void mbuf_free(struct mbuf *);
+
+/*
+ * Appends data to the Mbuf.
+ *
+ * Returns the number of bytes appended or 0 if out of memory.
+ */
+size_t mbuf_append(struct mbuf *, const void *data, size_t data_size);
+
+/*
+ * Inserts data at a specified offset in the Mbuf.
+ *
+ * Existing data will be shifted forwards and the buffer will
+ * be grown if necessary.
+ * Returns the number of bytes inserted.
+ */
+size_t mbuf_insert(struct mbuf *, size_t, const void *, size_t);
+
+/* Removes `data_size` bytes from the beginning of the buffer. */
+void mbuf_remove(struct mbuf *, size_t data_size);
+
+/*
+ * Resizes an Mbuf.
+ *
+ * If `new_size` is smaller than buffer's `len`, the
+ * resize is not performed.
+ */
+void mbuf_resize(struct mbuf *, size_t new_size);
+
+/* Shrinks an Mbuf by resizing its `size` to `len`. */
+void mbuf_trim(struct mbuf *);
+
+#if defined(__cplusplus)
+}
+#endif /* __cplusplus */
+
+#endif /* CS_COMMON_MBUF_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/sha1.h"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_SHA1_H_
+#define CS_COMMON_SHA1_H_
+
+#ifndef DISABLE_SHA1
+#define DISABLE_SHA1 0
+#endif
+
+#if !DISABLE_SHA1
+
+/* Amalgamated: #include "common/platform.h" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef struct {
+  uint32_t state[5];
+  uint32_t count[2];
+  unsigned char buffer[64];
+} cs_sha1_ctx;
+
+void cs_sha1_init(cs_sha1_ctx *);
+void cs_sha1_update(cs_sha1_ctx *, const unsigned char *data, uint32_t len);
+void cs_sha1_final(unsigned char digest[20], cs_sha1_ctx *);
+void cs_hmac_sha1(const unsigned char *key, size_t key_len,
+                  const unsigned char *text, size_t text_len,
+                  unsigned char out[20]);
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* DISABLE_SHA1 */
+
+#endif /* CS_COMMON_SHA1_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/md5.h"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_MD5_H_
+#define CS_COMMON_MD5_H_
+
+/* Amalgamated: #include "common/platform.h" */
+
+#ifndef DISABLE_MD5
+#define DISABLE_MD5 0
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef struct MD5Context {
+  uint32_t buf[4];
+  uint32_t bits[2];
+  unsigned char in[64];
+} MD5_CTX;
+
+void MD5_Init(MD5_CTX *c);
+void MD5_Update(MD5_CTX *c, const unsigned char *data, size_t len);
+void MD5_Final(unsigned char *md, MD5_CTX *c);
+
+/*
+ * Return stringified MD5 hash for NULL terminated list of pointer/length pairs.
+ * A length should be specified as size_t variable.
+ * Example:
+ *
+ *    char buf[33];
+ *    cs_md5(buf, "foo", (size_t) 3, "bar", (size_t) 3, NULL);
+ */
+char *cs_md5(char buf[33], ...);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* CS_COMMON_MD5_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/base64.h"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_BASE64_H_
+#define CS_COMMON_BASE64_H_
+
+#ifndef DISABLE_BASE64
+#define DISABLE_BASE64 0
+#endif
+
+#if !DISABLE_BASE64
+
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef void (*cs_base64_putc_t)(char, void *);
+
+struct cs_base64_ctx {
+  /* cannot call it putc because it's a macro on some environments */
+  cs_base64_putc_t b64_putc;
+  unsigned char chunk[3];
+  int chunk_size;
+  void *user_data;
+};
+
+void cs_base64_init(struct cs_base64_ctx *ctx, cs_base64_putc_t putc,
+                    void *user_data);
+void cs_base64_update(struct cs_base64_ctx *ctx, const char *str, size_t len);
+void cs_base64_finish(struct cs_base64_ctx *ctx);
+
+void cs_base64_encode(const unsigned char *src, int src_len, char *dst);
+void cs_fprint_base64(FILE *f, const unsigned char *src, int src_len);
+int cs_base64_decode(const unsigned char *s, int len, char *dst, int *dec_len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* DISABLE_BASE64 */
+
+#endif /* CS_COMMON_BASE64_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/str_util.h"
+#endif
+/*
+ * Copyright (c) 2015 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_COMMON_STR_UTIL_H_
+#define CS_COMMON_STR_UTIL_H_
+
+#include <stdarg.h>
+#include <stdlib.h>
+
+/* Amalgamated: #include "common/platform.h" */
+
+#ifndef CS_ENABLE_STRDUP
+#define CS_ENABLE_STRDUP 0
+#endif
+
+#ifndef CS_ENABLE_TO64
+#define CS_ENABLE_TO64 0
+#endif
+
+/*
+ * Expands to a string representation of its argument: e.g.
+ * `CS_STRINGIFY_LIT(5) expands to "5"`
+ */
+#define CS_STRINGIFY_LIT(x) #x
+
+/*
+ * Expands to a string representation of its argument, which is allowed
+ * to be a macro: e.g.
+ *
+ * #define FOO 123
+ * CS_STRINGIFY_MACRO(FOO)
+ *
+ * expands to 123.
+ */
+#define CS_STRINGIFY_MACRO(x) CS_STRINGIFY_LIT(x)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+size_t c_strnlen(const char *s, size_t maxlen);
+int c_snprintf(char *buf, size_t buf_size, const char *format, ...);
+int c_vsnprintf(char *buf, size_t buf_size, const char *format, va_list ap);
+/*
+ * Find the first occurrence of find in s, where the search is limited to the
+ * first slen characters of s.
+ */
+const char *c_strnstr(const char *s, const char *find, size_t slen);
+
+/*
+ * Stringify binary data. Output buffer size must be 2 * size_of_input + 1
+ * because each byte of input takes 2 bytes in string representation
+ * plus 1 byte for the terminating \0 character.
+ */
+void cs_to_hex(char *to, const unsigned char *p, size_t len);
+
+/*
+ * Convert stringified binary data back to binary.
+ * Does the reverse of `cs_to_hex()`.
+ */
+void cs_from_hex(char *to, const char *p, size_t len);
+
+#if CS_ENABLE_STRDUP
+char *strdup(const char *src);
+#endif
+
+#if CS_ENABLE_TO64
+#include <stdint.h>
+/*
+ * Simple string -> int64 conversion routine.
+ */
+int64_t cs_to64(const char *s);
+#endif
+
+/*
+ * Cross-platform version of `strncasecmp()`.
+ */
+int mg_ncasecmp(const char *s1, const char *s2, size_t len);
+
+/*
+ * Cross-platform version of `strcasecmp()`.
+ */
+int mg_casecmp(const char *s1, const char *s2);
+
+/*
+ * Prints message to the buffer. If the buffer is large enough to hold the
+ * message, it returns buffer. If buffer is to small, it allocates a large
+ * enough buffer on heap and returns allocated buffer.
+ * This is a supposed use case:
+ *
+ *    char buf[5], *p = buf;
+ *    mg_avprintf(&p, sizeof(buf), "%s", "hi there");
+ *    use_p_somehow(p);
+ *    if (p != buf) {
+ *      free(p);
+ *    }
+ *
+ * The purpose of this is to avoid malloc-ing if generated strings are small.
+ */
+int mg_asprintf(char **buf, size_t size, const char *fmt, ...);
+
+/* Same as mg_asprintf, but takes varargs list. */
+int mg_avprintf(char **buf, size_t size, const char *fmt, va_list ap);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CS_COMMON_STR_UTIL_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "common/queue.h"
+#endif
+/* clang-format off */
+/*-
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)queue.h	8.5 (Berkeley) 8/20/94
+ * $FreeBSD$
+ */
+
+#ifndef _SYS_QUEUE_H_
+#define	_SYS_QUEUE_H_
+
+/*
+ * This file defines four types of data structures: singly-linked lists,
+ * singly-linked tail queues, lists and tail queues.
+ *
+ * A singly-linked list is headed by a single forward pointer. The elements
+ * are singly linked for minimum space and pointer manipulation overhead at
+ * the expense of O(n) removal for arbitrary elements. New elements can be
+ * added to the list after an existing element or at the head of the list.
+ * Elements being removed from the head of the list should use the explicit
+ * macro for this purpose for optimum efficiency. A singly-linked list may
+ * only be traversed in the forward direction.  Singly-linked lists are ideal
+ * for applications with large datasets and few or no removals or for
+ * implementing a LIFO queue.
+ *
+ * A singly-linked tail queue is headed by a pair of pointers, one to the
+ * head of the list and the other to the tail of the list. The elements are
+ * singly linked for minimum space and pointer manipulation overhead at the
+ * expense of O(n) removal for arbitrary elements. New elements can be added
+ * to the list after an existing element, at the head of the list, or at the
+ * end of the list. Elements being removed from the head of the tail queue
+ * should use the explicit macro for this purpose for optimum efficiency.
+ * A singly-linked tail queue may only be traversed in the forward direction.
+ * Singly-linked tail queues are ideal for applications with large datasets
+ * and few or no removals or for implementing a FIFO queue.
+ *
+ * A list is headed by a single forward pointer (or an array of forward
+ * pointers for a hash table header). The elements are doubly linked
+ * so that an arbitrary element can be removed without a need to
+ * traverse the list. New elements can be added to the list before
+ * or after an existing element or at the head of the list. A list
+ * may be traversed in either direction.
+ *
+ * A tail queue is headed by a pair of pointers, one to the head of the
+ * list and the other to the tail of the list. The elements are doubly
+ * linked so that an arbitrary element can be removed without a need to
+ * traverse the list. New elements can be added to the list before or
+ * after an existing element, at the head of the list, or at the end of
+ * the list. A tail queue may be traversed in either direction.
+ *
+ * For details on the use of these macros, see the queue(3) manual page.
+ *
+ *
+ *				SLIST	LIST	STAILQ	TAILQ
+ * _HEAD			+	+	+	+
+ * _CLASS_HEAD			+	+	+	+
+ * _HEAD_INITIALIZER		+	+	+	+
+ * _ENTRY			+	+	+	+
+ * _CLASS_ENTRY			+	+	+	+
+ * _INIT			+	+	+	+
+ * _EMPTY			+	+	+	+
+ * _FIRST			+	+	+	+
+ * _NEXT			+	+	+	+
+ * _PREV			-	+	-	+
+ * _LAST			-	-	+	+
+ * _FOREACH			+	+	+	+
+ * _FOREACH_FROM		+	+	+	+
+ * _FOREACH_SAFE		+	+	+	+
+ * _FOREACH_FROM_SAFE		+	+	+	+
+ * _FOREACH_REVERSE		-	-	-	+
+ * _FOREACH_REVERSE_FROM	-	-	-	+
+ * _FOREACH_REVERSE_SAFE	-	-	-	+
+ * _FOREACH_REVERSE_FROM_SAFE	-	-	-	+
+ * _INSERT_HEAD			+	+	+	+
+ * _INSERT_BEFORE		-	+	-	+
+ * _INSERT_AFTER		+	+	+	+
+ * _INSERT_TAIL			-	-	+	+
+ * _CONCAT			-	-	+	+
+ * _REMOVE_AFTER		+	-	+	-
+ * _REMOVE_HEAD			+	-	+	-
+ * _REMOVE			+	+	+	+
+ * _SWAP			+	+	+	+
+ *
+ */
+#ifdef QUEUE_MACRO_DEBUG
+/* Store the last 2 places the queue element or head was altered */
+struct qm_trace {
+	unsigned long	 lastline;
+	unsigned long	 prevline;
+	const char	*lastfile;
+	const char	*prevfile;
+};
+
+#define	TRACEBUF	struct qm_trace trace;
+#define	TRACEBUF_INITIALIZER	{ __LINE__, 0, __FILE__, NULL } ,
+#define	TRASHIT(x)	do {(x) = (void *)-1;} while (0)
+#define	QMD_SAVELINK(name, link)	void **name = (void *)&(link)
+
+#define	QMD_TRACE_HEAD(head) do {					\
+	(head)->trace.prevline = (head)->trace.lastline;		\
+	(head)->trace.prevfile = (head)->trace.lastfile;		\
+	(head)->trace.lastline = __LINE__;				\
+	(head)->trace.lastfile = __FILE__;				\
+} while (0)
+
+#define	QMD_TRACE_ELEM(elem) do {					\
+	(elem)->trace.prevline = (elem)->trace.lastline;		\
+	(elem)->trace.prevfile = (elem)->trace.lastfile;		\
+	(elem)->trace.lastline = __LINE__;				\
+	(elem)->trace.lastfile = __FILE__;				\
+} while (0)
+
+#else
+#define	QMD_TRACE_ELEM(elem)
+#define	QMD_TRACE_HEAD(head)
+#define	QMD_SAVELINK(name, link)
+#define	TRACEBUF
+#define	TRACEBUF_INITIALIZER
+#define	TRASHIT(x)
+#endif	/* QUEUE_MACRO_DEBUG */
+
+#ifdef __cplusplus
+/*
+ * In C++ there can be structure lists and class lists:
+ */
+#define	QUEUE_TYPEOF(type) type
+#else
+#define	QUEUE_TYPEOF(type) struct type
+#endif
+
+/*
+ * Singly-linked List declarations.
+ */
+#define	SLIST_HEAD(name, type)						\
+struct name {								\
+	struct type *slh_first;	/* first element */			\
+}
+
+#define	SLIST_CLASS_HEAD(name, type)					\
+struct name {								\
+	class type *slh_first;	/* first element */			\
+}
+
+#define	SLIST_HEAD_INITIALIZER(head)					\
+	{ NULL }
+
+#define	SLIST_ENTRY(type)						\
+struct {								\
+	struct type *sle_next;	/* next element */			\
+}
+
+#define	SLIST_CLASS_ENTRY(type)						\
+struct {								\
+	class type *sle_next;		/* next element */		\
+}
+
+/*
+ * Singly-linked List functions.
+ */
+#define	SLIST_EMPTY(head)	((head)->slh_first == NULL)
+
+#define	SLIST_FIRST(head)	((head)->slh_first)
+
+#define	SLIST_FOREACH(var, head, field)					\
+	for ((var) = SLIST_FIRST((head));				\
+	    (var);							\
+	    (var) = SLIST_NEXT((var), field))
+
+#define	SLIST_FOREACH_FROM(var, head, field)				\
+	for ((var) = ((var) ? (var) : SLIST_FIRST((head)));		\
+	    (var);							\
+	    (var) = SLIST_NEXT((var), field))
+
+#define	SLIST_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = SLIST_FIRST((head));				\
+	    (var) && ((tvar) = SLIST_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+
+#define	SLIST_FOREACH_FROM_SAFE(var, head, field, tvar)			\
+	for ((var) = ((var) ? (var) : SLIST_FIRST((head)));		\
+	    (var) && ((tvar) = SLIST_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+
+#define	SLIST_FOREACH_PREVPTR(var, varp, head, field)			\
+	for ((varp) = &SLIST_FIRST((head));				\
+	    ((var) = *(varp)) != NULL;					\
+	    (varp) = &SLIST_NEXT((var), field))
+
+#define	SLIST_INIT(head) do {						\
+	SLIST_FIRST((head)) = NULL;					\
+} while (0)
+
+#define	SLIST_INSERT_AFTER(slistelm, elm, field) do {			\
+	SLIST_NEXT((elm), field) = SLIST_NEXT((slistelm), field);	\
+	SLIST_NEXT((slistelm), field) = (elm);				\
+} while (0)
+
+#define	SLIST_INSERT_HEAD(head, elm, field) do {			\
+	SLIST_NEXT((elm), field) = SLIST_FIRST((head));			\
+	SLIST_FIRST((head)) = (elm);					\
+} while (0)
+
+#define	SLIST_NEXT(elm, field)	((elm)->field.sle_next)
+
+#define	SLIST_REMOVE(head, elm, type, field) do {			\
+	QMD_SAVELINK(oldnext, (elm)->field.sle_next);			\
+	if (SLIST_FIRST((head)) == (elm)) {				\
+		SLIST_REMOVE_HEAD((head), field);			\
+	}								\
+	else {								\
+		QUEUE_TYPEOF(type) *curelm = SLIST_FIRST(head);		\
+		while (SLIST_NEXT(curelm, field) != (elm))		\
+			curelm = SLIST_NEXT(curelm, field);		\
+		SLIST_REMOVE_AFTER(curelm, field);			\
+	}								\
+	TRASHIT(*oldnext);						\
+} while (0)
+
+#define SLIST_REMOVE_AFTER(elm, field) do {				\
+	SLIST_NEXT(elm, field) =					\
+	    SLIST_NEXT(SLIST_NEXT(elm, field), field);			\
+} while (0)
+
+#define	SLIST_REMOVE_HEAD(head, field) do {				\
+	SLIST_FIRST((head)) = SLIST_NEXT(SLIST_FIRST((head)), field);	\
+} while (0)
+
+#define SLIST_SWAP(head1, head2, type) do {				\
+	QUEUE_TYPEOF(type) *swap_first = SLIST_FIRST(head1);		\
+	SLIST_FIRST(head1) = SLIST_FIRST(head2);			\
+	SLIST_FIRST(head2) = swap_first;				\
+} while (0)
+
+/*
+ * Singly-linked Tail queue declarations.
+ */
+#define	STAILQ_HEAD(name, type)						\
+struct name {								\
+	struct type *stqh_first;/* first element */			\
+	struct type **stqh_last;/* addr of last next element */		\
+}
+
+#define	STAILQ_CLASS_HEAD(name, type)					\
+struct name {								\
+	class type *stqh_first;	/* first element */			\
+	class type **stqh_last;	/* addr of last next element */		\
+}
+
+#define	STAILQ_HEAD_INITIALIZER(head)					\
+	{ NULL, &(head).stqh_first }
+
+#define	STAILQ_ENTRY(type)						\
+struct {								\
+	struct type *stqe_next;	/* next element */			\
+}
+
+#define	STAILQ_CLASS_ENTRY(type)					\
+struct {								\
+	class type *stqe_next;	/* next element */			\
+}
+
+/*
+ * Singly-linked Tail queue functions.
+ */
+#define	STAILQ_CONCAT(head1, head2) do {				\
+	if (!STAILQ_EMPTY((head2))) {					\
+		*(head1)->stqh_last = (head2)->stqh_first;		\
+		(head1)->stqh_last = (head2)->stqh_last;		\
+		STAILQ_INIT((head2));					\
+	}								\
+} while (0)
+
+#define	STAILQ_EMPTY(head)	((head)->stqh_first == NULL)
+
+#define	STAILQ_FIRST(head)	((head)->stqh_first)
+
+#define	STAILQ_FOREACH(var, head, field)				\
+	for((var) = STAILQ_FIRST((head));				\
+	   (var);							\
+	   (var) = STAILQ_NEXT((var), field))
+
+#define	STAILQ_FOREACH_FROM(var, head, field)				\
+	for ((var) = ((var) ? (var) : STAILQ_FIRST((head)));		\
+	   (var);							\
+	   (var) = STAILQ_NEXT((var), field))
+
+#define	STAILQ_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = STAILQ_FIRST((head));				\
+	    (var) && ((tvar) = STAILQ_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+
+#define	STAILQ_FOREACH_FROM_SAFE(var, head, field, tvar)		\
+	for ((var) = ((var) ? (var) : STAILQ_FIRST((head)));		\
+	    (var) && ((tvar) = STAILQ_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+
+#define	STAILQ_INIT(head) do {						\
+	STAILQ_FIRST((head)) = NULL;					\
+	(head)->stqh_last = &STAILQ_FIRST((head));			\
+} while (0)
+
+#define	STAILQ_INSERT_AFTER(head, tqelm, elm, field) do {		\
+	if ((STAILQ_NEXT((elm), field) = STAILQ_NEXT((tqelm), field)) == NULL)\
+		(head)->stqh_last = &STAILQ_NEXT((elm), field);		\
+	STAILQ_NEXT((tqelm), field) = (elm);				\
+} while (0)
+
+#define	STAILQ_INSERT_HEAD(head, elm, field) do {			\
+	if ((STAILQ_NEXT((elm), field) = STAILQ_FIRST((head))) == NULL)	\
+		(head)->stqh_last = &STAILQ_NEXT((elm), field);		\
+	STAILQ_FIRST((head)) = (elm);					\
+} while (0)
+
+#define	STAILQ_INSERT_TAIL(head, elm, field) do {			\
+	STAILQ_NEXT((elm), field) = NULL;				\
+	*(head)->stqh_last = (elm);					\
+	(head)->stqh_last = &STAILQ_NEXT((elm), field);			\
+} while (0)
+
+#define	STAILQ_LAST(head, type, field)				\
+	(STAILQ_EMPTY((head)) ? NULL :				\
+	    __containerof((head)->stqh_last,			\
+	    QUEUE_TYPEOF(type), field.stqe_next))
+
+#define	STAILQ_NEXT(elm, field)	((elm)->field.stqe_next)
+
+#define	STAILQ_REMOVE(head, elm, type, field) do {			\
+	QMD_SAVELINK(oldnext, (elm)->field.stqe_next);			\
+	if (STAILQ_FIRST((head)) == (elm)) {				\
+		STAILQ_REMOVE_HEAD((head), field);			\
+	}								\
+	else {								\
+		QUEUE_TYPEOF(type) *curelm = STAILQ_FIRST(head);	\
+		while (STAILQ_NEXT(curelm, field) != (elm))		\
+			curelm = STAILQ_NEXT(curelm, field);		\
+		STAILQ_REMOVE_AFTER(head, curelm, field);		\
+	}								\
+	TRASHIT(*oldnext);						\
+} while (0)
+
+#define STAILQ_REMOVE_AFTER(head, elm, field) do {			\
+	if ((STAILQ_NEXT(elm, field) =					\
+	     STAILQ_NEXT(STAILQ_NEXT(elm, field), field)) == NULL)	\
+		(head)->stqh_last = &STAILQ_NEXT((elm), field);		\
+} while (0)
+
+#define	STAILQ_REMOVE_HEAD(head, field) do {				\
+	if ((STAILQ_FIRST((head)) =					\
+	     STAILQ_NEXT(STAILQ_FIRST((head)), field)) == NULL)		\
+		(head)->stqh_last = &STAILQ_FIRST((head));		\
+} while (0)
+
+#define STAILQ_SWAP(head1, head2, type) do {				\
+	QUEUE_TYPEOF(type) *swap_first = STAILQ_FIRST(head1);		\
+	QUEUE_TYPEOF(type) **swap_last = (head1)->stqh_last;		\
+	STAILQ_FIRST(head1) = STAILQ_FIRST(head2);			\
+	(head1)->stqh_last = (head2)->stqh_last;			\
+	STAILQ_FIRST(head2) = swap_first;				\
+	(head2)->stqh_last = swap_last;					\
+	if (STAILQ_EMPTY(head1))					\
+		(head1)->stqh_last = &STAILQ_FIRST(head1);		\
+	if (STAILQ_EMPTY(head2))					\
+		(head2)->stqh_last = &STAILQ_FIRST(head2);		\
+} while (0)
+
+
+/*
+ * List declarations.
+ */
+#define	LIST_HEAD(name, type)						\
+struct name {								\
+	struct type *lh_first;	/* first element */			\
+}
+
+#define	LIST_CLASS_HEAD(name, type)					\
+struct name {								\
+	class type *lh_first;	/* first element */			\
+}
+
+#define	LIST_HEAD_INITIALIZER(head)					\
+	{ NULL }
+
+#define	LIST_ENTRY(type)						\
+struct {								\
+	struct type *le_next;	/* next element */			\
+	struct type **le_prev;	/* address of previous next element */	\
+}
+
+#define	LIST_CLASS_ENTRY(type)						\
+struct {								\
+	class type *le_next;	/* next element */			\
+	class type **le_prev;	/* address of previous next element */	\
+}
+
+/*
+ * List functions.
+ */
+
+#if (defined(_KERNEL) && defined(INVARIANTS))
+#define	QMD_LIST_CHECK_HEAD(head, field) do {				\
+	if (LIST_FIRST((head)) != NULL &&				\
+	    LIST_FIRST((head))->field.le_prev !=			\
+	     &LIST_FIRST((head)))					\
+		panic("Bad list head %p first->prev != head", (head));	\
+} while (0)
+
+#define	QMD_LIST_CHECK_NEXT(elm, field) do {				\
+	if (LIST_NEXT((elm), field) != NULL &&				\
+	    LIST_NEXT((elm), field)->field.le_prev !=			\
+	     &((elm)->field.le_next))					\
+	     	panic("Bad link elm %p next->prev != elm", (elm));	\
+} while (0)
+
+#define	QMD_LIST_CHECK_PREV(elm, field) do {				\
+	if (*(elm)->field.le_prev != (elm))				\
+		panic("Bad link elm %p prev->next != elm", (elm));	\
+} while (0)
+#else
+#define	QMD_LIST_CHECK_HEAD(head, field)
+#define	QMD_LIST_CHECK_NEXT(elm, field)
+#define	QMD_LIST_CHECK_PREV(elm, field)
+#endif /* (_KERNEL && INVARIANTS) */
+
+#define	LIST_EMPTY(head)	((head)->lh_first == NULL)
+
+#define	LIST_FIRST(head)	((head)->lh_first)
+
+#define	LIST_FOREACH(var, head, field)					\
+	for ((var) = LIST_FIRST((head));				\
+	    (var);							\
+	    (var) = LIST_NEXT((var), field))
+
+#define	LIST_FOREACH_FROM(var, head, field)				\
+	for ((var) = ((var) ? (var) : LIST_FIRST((head)));		\
+	    (var);							\
+	    (var) = LIST_NEXT((var), field))
+
+#define	LIST_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = LIST_FIRST((head));				\
+	    (var) && ((tvar) = LIST_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+
+#define	LIST_FOREACH_FROM_SAFE(var, head, field, tvar)			\
+	for ((var) = ((var) ? (var) : LIST_FIRST((head)));		\
+	    (var) && ((tvar) = LIST_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+
+#define	LIST_INIT(head) do {						\
+	LIST_FIRST((head)) = NULL;					\
+} while (0)
+
+#define	LIST_INSERT_AFTER(listelm, elm, field) do {			\
+	QMD_LIST_CHECK_NEXT(listelm, field);				\
+	if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) != NULL)\
+		LIST_NEXT((listelm), field)->field.le_prev =		\
+		    &LIST_NEXT((elm), field);				\
+	LIST_NEXT((listelm), field) = (elm);				\
+	(elm)->field.le_prev = &LIST_NEXT((listelm), field);		\
+} while (0)
+
+#define	LIST_INSERT_BEFORE(listelm, elm, field) do {			\
+	QMD_LIST_CHECK_PREV(listelm, field);				\
+	(elm)->field.le_prev = (listelm)->field.le_prev;		\
+	LIST_NEXT((elm), field) = (listelm);				\
+	*(listelm)->field.le_prev = (elm);				\
+	(listelm)->field.le_prev = &LIST_NEXT((elm), field);		\
+} while (0)
+
+#define	LIST_INSERT_HEAD(head, elm, field) do {				\
+	QMD_LIST_CHECK_HEAD((head), field);				\
+	if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL)	\
+		LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);\
+	LIST_FIRST((head)) = (elm);					\
+	(elm)->field.le_prev = &LIST_FIRST((head));			\
+} while (0)
+
+#define	LIST_NEXT(elm, field)	((elm)->field.le_next)
+
+#define	LIST_PREV(elm, head, type, field)			\
+	((elm)->field.le_prev == &LIST_FIRST((head)) ? NULL :	\
+	    __containerof((elm)->field.le_prev,			\
+	    QUEUE_TYPEOF(type), field.le_next))
+
+#define	LIST_REMOVE(elm, field) do {					\
+	QMD_SAVELINK(oldnext, (elm)->field.le_next);			\
+	QMD_SAVELINK(oldprev, (elm)->field.le_prev);			\
+	QMD_LIST_CHECK_NEXT(elm, field);				\
+	QMD_LIST_CHECK_PREV(elm, field);				\
+	if (LIST_NEXT((elm), field) != NULL)				\
+		LIST_NEXT((elm), field)->field.le_prev = 		\
+		    (elm)->field.le_prev;				\
+	*(elm)->field.le_prev = LIST_NEXT((elm), field);		\
+	TRASHIT(*oldnext);						\
+	TRASHIT(*oldprev);						\
+} while (0)
+
+#define LIST_SWAP(head1, head2, type, field) do {			\
+	QUEUE_TYPEOF(type) *swap_tmp = LIST_FIRST(head1);		\
+	LIST_FIRST((head1)) = LIST_FIRST((head2));			\
+	LIST_FIRST((head2)) = swap_tmp;					\
+	if ((swap_tmp = LIST_FIRST((head1))) != NULL)			\
+		swap_tmp->field.le_prev = &LIST_FIRST((head1));		\
+	if ((swap_tmp = LIST_FIRST((head2))) != NULL)			\
+		swap_tmp->field.le_prev = &LIST_FIRST((head2));		\
+} while (0)
+
+/*
+ * Tail queue declarations.
+ */
+#define	TAILQ_HEAD(name, type)						\
+struct name {								\
+	struct type *tqh_first;	/* first element */			\
+	struct type **tqh_last;	/* addr of last next element */		\
+	TRACEBUF							\
+}
+
+#define	TAILQ_CLASS_HEAD(name, type)					\
+struct name {								\
+	class type *tqh_first;	/* first element */			\
+	class type **tqh_last;	/* addr of last next element */		\
+	TRACEBUF							\
+}
+
+#define	TAILQ_HEAD_INITIALIZER(head)					\
+	{ NULL, &(head).tqh_first, TRACEBUF_INITIALIZER }
+
+#define	TAILQ_ENTRY(type)						\
+struct {								\
+	struct type *tqe_next;	/* next element */			\
+	struct type **tqe_prev;	/* address of previous next element */	\
+	TRACEBUF							\
+}
+
+#define	TAILQ_CLASS_ENTRY(type)						\
+struct {								\
+	class type *tqe_next;	/* next element */			\
+	class type **tqe_prev;	/* address of previous next element */	\
+	TRACEBUF							\
+}
+
+/*
+ * Tail queue functions.
+ */
+#if (defined(_KERNEL) && defined(INVARIANTS))
+#define	QMD_TAILQ_CHECK_HEAD(head, field) do {				\
+	if (!TAILQ_EMPTY(head) &&					\
+	    TAILQ_FIRST((head))->field.tqe_prev !=			\
+	     &TAILQ_FIRST((head)))					\
+		panic("Bad tailq head %p first->prev != head", (head));	\
+} while (0)
+
+#define	QMD_TAILQ_CHECK_TAIL(head, field) do {				\
+	if (*(head)->tqh_last != NULL)					\
+	    	panic("Bad tailq NEXT(%p->tqh_last) != NULL", (head)); 	\
+} while (0)
+
+#define	QMD_TAILQ_CHECK_NEXT(elm, field) do {				\
+	if (TAILQ_NEXT((elm), field) != NULL &&				\
+	    TAILQ_NEXT((elm), field)->field.tqe_prev !=			\
+	     &((elm)->field.tqe_next))					\
+		panic("Bad link elm %p next->prev != elm", (elm));	\
+} while (0)
+
+#define	QMD_TAILQ_CHECK_PREV(elm, field) do {				\
+	if (*(elm)->field.tqe_prev != (elm))				\
+		panic("Bad link elm %p prev->next != elm", (elm));	\
+} while (0)
+#else
+#define	QMD_TAILQ_CHECK_HEAD(head, field)
+#define	QMD_TAILQ_CHECK_TAIL(head, headname)
+#define	QMD_TAILQ_CHECK_NEXT(elm, field)
+#define	QMD_TAILQ_CHECK_PREV(elm, field)
+#endif /* (_KERNEL && INVARIANTS) */
+
+#define	TAILQ_CONCAT(head1, head2, field) do {				\
+	if (!TAILQ_EMPTY(head2)) {					\
+		*(head1)->tqh_last = (head2)->tqh_first;		\
+		(head2)->tqh_first->field.tqe_prev = (head1)->tqh_last;	\
+		(head1)->tqh_last = (head2)->tqh_last;			\
+		TAILQ_INIT((head2));					\
+		QMD_TRACE_HEAD(head1);					\
+		QMD_TRACE_HEAD(head2);					\
+	}								\
+} while (0)
+
+#define	TAILQ_EMPTY(head)	((head)->tqh_first == NULL)
+
+#define	TAILQ_FIRST(head)	((head)->tqh_first)
+
+#define	TAILQ_FOREACH(var, head, field)					\
+	for ((var) = TAILQ_FIRST((head));				\
+	    (var);							\
+	    (var) = TAILQ_NEXT((var), field))
+
+#define	TAILQ_FOREACH_FROM(var, head, field)				\
+	for ((var) = ((var) ? (var) : TAILQ_FIRST((head)));		\
+	    (var);							\
+	    (var) = TAILQ_NEXT((var), field))
+
+#define	TAILQ_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = TAILQ_FIRST((head));				\
+	    (var) && ((tvar) = TAILQ_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+
+#define	TAILQ_FOREACH_FROM_SAFE(var, head, field, tvar)			\
+	for ((var) = ((var) ? (var) : TAILQ_FIRST((head)));		\
+	    (var) && ((tvar) = TAILQ_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+
+#define	TAILQ_FOREACH_REVERSE(var, head, headname, field)		\
+	for ((var) = TAILQ_LAST((head), headname);			\
+	    (var);							\
+	    (var) = TAILQ_PREV((var), headname, field))
+
+#define	TAILQ_FOREACH_REVERSE_FROM(var, head, headname, field)		\
+	for ((var) = ((var) ? (var) : TAILQ_LAST((head), headname));	\
+	    (var);							\
+	    (var) = TAILQ_PREV((var), headname, field))
+
+#define	TAILQ_FOREACH_REVERSE_SAFE(var, head, headname, field, tvar)	\
+	for ((var) = TAILQ_LAST((head), headname);			\
+	    (var) && ((tvar) = TAILQ_PREV((var), headname, field), 1);	\
+	    (var) = (tvar))
+
+#define	TAILQ_FOREACH_REVERSE_FROM_SAFE(var, head, headname, field, tvar) \
+	for ((var) = ((var) ? (var) : TAILQ_LAST((head), headname));	\
+	    (var) && ((tvar) = TAILQ_PREV((var), headname, field), 1);	\
+	    (var) = (tvar))
+
+#define	TAILQ_INIT(head) do {						\
+	TAILQ_FIRST((head)) = NULL;					\
+	(head)->tqh_last = &TAILQ_FIRST((head));			\
+	QMD_TRACE_HEAD(head);						\
+} while (0)
+
+#define	TAILQ_INSERT_AFTER(head, listelm, elm, field) do {		\
+	QMD_TAILQ_CHECK_NEXT(listelm, field);				\
+	if ((TAILQ_NEXT((elm), field) = TAILQ_NEXT((listelm), field)) != NULL)\
+		TAILQ_NEXT((elm), field)->field.tqe_prev = 		\
+		    &TAILQ_NEXT((elm), field);				\
+	else {								\
+		(head)->tqh_last = &TAILQ_NEXT((elm), field);		\
+		QMD_TRACE_HEAD(head);					\
+	}								\
+	TAILQ_NEXT((listelm), field) = (elm);				\
+	(elm)->field.tqe_prev = &TAILQ_NEXT((listelm), field);		\
+	QMD_TRACE_ELEM(&(elm)->field);					\
+	QMD_TRACE_ELEM(&(listelm)->field);				\
+} while (0)
+
+#define	TAILQ_INSERT_BEFORE(listelm, elm, field) do {			\
+	QMD_TAILQ_CHECK_PREV(listelm, field);				\
+	(elm)->field.tqe_prev = (listelm)->field.tqe_prev;		\
+	TAILQ_NEXT((elm), field) = (listelm);				\
+	*(listelm)->field.tqe_prev = (elm);				\
+	(listelm)->field.tqe_prev = &TAILQ_NEXT((elm), field);		\
+	QMD_TRACE_ELEM(&(elm)->field);					\
+	QMD_TRACE_ELEM(&(listelm)->field);				\
+} while (0)
+
+#define	TAILQ_INSERT_HEAD(head, elm, field) do {			\
+	QMD_TAILQ_CHECK_HEAD(head, field);				\
+	if ((TAILQ_NEXT((elm), field) = TAILQ_FIRST((head))) != NULL)	\
+		TAILQ_FIRST((head))->field.tqe_prev =			\
+		    &TAILQ_NEXT((elm), field);				\
+	else								\
+		(head)->tqh_last = &TAILQ_NEXT((elm), field);		\
+	TAILQ_FIRST((head)) = (elm);					\
+	(elm)->field.tqe_prev = &TAILQ_FIRST((head));			\
+	QMD_TRACE_HEAD(head);						\
+	QMD_TRACE_ELEM(&(elm)->field);					\
+} while (0)
+
+#define	TAILQ_INSERT_TAIL(head, elm, field) do {			\
+	QMD_TAILQ_CHECK_TAIL(head, field);				\
+	TAILQ_NEXT((elm), field) = NULL;				\
+	(elm)->field.tqe_prev = (head)->tqh_last;			\
+	*(head)->tqh_last = (elm);					\
+	(head)->tqh_last = &TAILQ_NEXT((elm), field);			\
+	QMD_TRACE_HEAD(head);						\
+	QMD_TRACE_ELEM(&(elm)->field);					\
+} while (0)
+
+#define	TAILQ_LAST(head, headname)					\
+	(*(((struct headname *)((head)->tqh_last))->tqh_last))
+
+#define	TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
+
+#define	TAILQ_PREV(elm, headname, field)				\
+	(*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
+
+#define	TAILQ_REMOVE(head, elm, field) do {				\
+	QMD_SAVELINK(oldnext, (elm)->field.tqe_next);			\
+	QMD_SAVELINK(oldprev, (elm)->field.tqe_prev);			\
+	QMD_TAILQ_CHECK_NEXT(elm, field);				\
+	QMD_TAILQ_CHECK_PREV(elm, field);				\
+	if ((TAILQ_NEXT((elm), field)) != NULL)				\
+		TAILQ_NEXT((elm), field)->field.tqe_prev = 		\
+		    (elm)->field.tqe_prev;				\
+	else {								\
+		(head)->tqh_last = (elm)->field.tqe_prev;		\
+		QMD_TRACE_HEAD(head);					\
+	}								\
+	*(elm)->field.tqe_prev = TAILQ_NEXT((elm), field);		\
+	TRASHIT(*oldnext);						\
+	TRASHIT(*oldprev);						\
+	QMD_TRACE_ELEM(&(elm)->field);					\
+} while (0)
+
+#define TAILQ_SWAP(head1, head2, type, field) do {			\
+	QUEUE_TYPEOF(type) *swap_first = (head1)->tqh_first;		\
+	QUEUE_TYPEOF(type) **swap_last = (head1)->tqh_last;		\
+	(head1)->tqh_first = (head2)->tqh_first;			\
+	(head1)->tqh_last = (head2)->tqh_last;				\
+	(head2)->tqh_first = swap_first;				\
+	(head2)->tqh_last = swap_last;					\
+	if ((swap_first = (head1)->tqh_first) != NULL)			\
+		swap_first->field.tqe_prev = &(head1)->tqh_first;	\
+	else								\
+		(head1)->tqh_last = &(head1)->tqh_first;		\
+	if ((swap_first = (head2)->tqh_first) != NULL)			\
+		swap_first->field.tqe_prev = &(head2)->tqh_first;	\
+	else								\
+		(head2)->tqh_last = &(head2)->tqh_first;		\
+} while (0)
+
+#endif /* !_SYS_QUEUE_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/features.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_MONGOOSE_SRC_FEATURES_H_
+#define CS_MONGOOSE_SRC_FEATURES_H_
+
+#ifndef MG_DISABLE_HTTP_DIGEST_AUTH
+#define MG_DISABLE_HTTP_DIGEST_AUTH 0
+#endif
+
+#ifndef MG_DISABLE_HTTP_KEEP_ALIVE
+#define MG_DISABLE_HTTP_KEEP_ALIVE 0
+#endif
+
+#ifndef MG_DISABLE_PFS
+#define MG_DISABLE_PFS 0
+#endif
+
+#ifndef MG_DISABLE_WS_RANDOM_MASK
+#define MG_DISABLE_WS_RANDOM_MASK 0
+#endif
+
+#ifndef MG_ENABLE_ASYNC_RESOLVER
+#define MG_ENABLE_ASYNC_RESOLVER 1
+#endif
+
+#ifndef MG_ENABLE_BROADCAST
+#define MG_ENABLE_BROADCAST 0
+#endif
+
+#ifndef MG_ENABLE_COAP
+#define MG_ENABLE_COAP 0
+#endif
+
+#ifndef MG_ENABLE_DEBUG
+#define MG_ENABLE_DEBUG 0
+#endif
+
+#ifndef MG_ENABLE_DIRECTORY_LISTING
+#define MG_ENABLE_DIRECTORY_LISTING 0
+#endif
+
+#ifndef MG_ENABLE_DNS
+#define MG_ENABLE_DNS 1
+#endif
+
+#ifndef MG_ENABLE_DNS_SERVER
+#define MG_ENABLE_DNS_SERVER 0
+#endif
+
+#ifndef MG_ENABLE_FAKE_DAVLOCK
+#define MG_ENABLE_FAKE_DAVLOCK 0
+#endif
+
+#ifndef MG_ENABLE_FILESYSTEM
+#define MG_ENABLE_FILESYSTEM 0
+#endif
+
+#ifndef MG_ENABLE_GETADDRINFO
+#define MG_ENABLE_GETADDRINFO 0
+#endif
+
+#ifndef MG_ENABLE_HEXDUMP
+#define MG_ENABLE_HEXDUMP CS_ENABLE_STDIO
+#endif
+
+#ifndef MG_ENABLE_HTTP
+#define MG_ENABLE_HTTP 1
+#endif
+
+#ifndef MG_ENABLE_HTTP_CGI
+#define MG_ENABLE_HTTP_CGI 0
+#endif
+
+#ifndef MG_ENABLE_HTTP_SSI
+#define MG_ENABLE_HTTP_SSI MG_ENABLE_FILESYSTEM
+#endif
+
+#ifndef MG_ENABLE_HTTP_SSI_EXEC
+#define MG_ENABLE_HTTP_SSI_EXEC 0
+#endif
+
+#ifndef MG_ENABLE_HTTP_STREAMING_MULTIPART
+#define MG_ENABLE_HTTP_STREAMING_MULTIPART 0
+#endif
+
+#ifndef MG_ENABLE_HTTP_WEBDAV
+#define MG_ENABLE_HTTP_WEBDAV 0
+#endif
+
+#ifndef MG_ENABLE_HTTP_WEBSOCKET
+#define MG_ENABLE_HTTP_WEBSOCKET MG_ENABLE_HTTP
+#endif
+
+#ifndef MG_ENABLE_IPV6
+#define MG_ENABLE_IPV6 0
+#endif
+
+#ifndef MG_ENABLE_JAVASCRIPT
+#define MG_ENABLE_JAVASCRIPT 0
+#endif
+
+#ifndef MG_ENABLE_MQTT
+#define MG_ENABLE_MQTT 1
+#endif
+
+#ifndef MG_ENABLE_MQTT_BROKER
+#define MG_ENABLE_MQTT_BROKER 0
+#endif
+
+#ifndef MG_ENABLE_SSL
+#define MG_ENABLE_SSL 0
+#endif
+
+#ifndef MG_ENABLE_SYNC_RESOLVER
+#define MG_ENABLE_SYNC_RESOLVER 0
+#endif
+
+#ifndef MG_ENABLE_STDIO
+#define MG_ENABLE_STDIO CS_ENABLE_STDIO
+#endif
+
+#ifndef MG_NET_IF
+#define MG_NET_IF MG_NET_IF_SOCKET
+#endif
+
+#ifndef MG_SSL_IF
+#define MG_SSL_IF MG_SSL_IF_OPENSSL
+#endif
+
+#ifndef MG_ENABLE_THREADS /* ifdef-ok */
+#ifdef _WIN32
+#define MG_ENABLE_THREADS 1
+#else
+#define MG_ENABLE_THREADS 0
+#endif
+#endif
+
+#if MG_ENABLE_DEBUG && !defined(CS_ENABLE_DEBUG)
+#define CS_ENABLE_DEBUG 1
+#endif
+
+/* MQTT broker requires MQTT */
+#if MG_ENABLE_MQTT_BROKER && !MG_ENABLE_MQTT
+#undef MG_ENABLE_MQTT
+#define MG_ENABLE_MQTT 1
+#endif
+
+#ifndef MG_ENABLE_HTTP_URL_REWRITES
+#define MG_ENABLE_HTTP_URL_REWRITES \
+  (CS_PLATFORM == CS_P_WINDOWS || CS_PLATFORM == CS_P_UNIX)
+#endif
+
+#ifndef MG_ENABLE_TUN
+#define MG_ENABLE_TUN MG_ENABLE_HTTP_WEBSOCKET
+#endif
+
+#ifndef MG_ENABLE_SNTP
+#define MG_ENABLE_SNTP 0
+#endif
+
+#ifndef MG_ENABLE_EXTRA_ERRORS_DESC
+#define MG_ENABLE_EXTRA_ERRORS_DESC 0
+#endif
+
+#endif /* CS_MONGOOSE_SRC_FEATURES_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/net_if.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_MONGOOSE_SRC_NET_IF_H_
+#define CS_MONGOOSE_SRC_NET_IF_H_
+
+/* Amalgamated: #include "common/platform.h" */
+
+/*
+ * Internal async networking core interface.
+ * Consists of calls made by the core, which should not block,
+ * and callbacks back into the core ("..._cb").
+ * Callbacks may (will) cause methods to be invoked from within,
+ * but methods are not allowed to invoke callbacks inline.
+ *
+ * Implementation must ensure that only one callback is invoked at any time.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#define MG_MAIN_IFACE 0
+
+struct mg_mgr;
+struct mg_connection;
+union socket_address;
+
+struct mg_iface_vtable;
+
+struct mg_iface {
+  struct mg_mgr *mgr;
+  void *data; /* Implementation-specific data */
+  struct mg_iface_vtable *vtable;
+};
+
+struct mg_iface_vtable {
+  void (*init)(struct mg_iface *iface);
+  void (*free)(struct mg_iface *iface);
+  void (*add_conn)(struct mg_connection *nc);
+  void (*remove_conn)(struct mg_connection *nc);
+  time_t (*poll)(struct mg_iface *iface, int timeout_ms);
+
+  /* Set up a listening TCP socket on a given address. rv = 0 -> ok. */
+  int (*listen_tcp)(struct mg_connection *nc, union socket_address *sa);
+  /* Request that a "listening" UDP socket be created. */
+  int (*listen_udp)(struct mg_connection *nc, union socket_address *sa);
+
+  /* Request that a TCP connection is made to the specified address. */
+  void (*connect_tcp)(struct mg_connection *nc, const union socket_address *sa);
+  /* Open a UDP socket. Doesn't actually connect anything. */
+  void (*connect_udp)(struct mg_connection *nc);
+
+  /* Send functions for TCP and UDP. Sent data is copied before return. */
+  void (*tcp_send)(struct mg_connection *nc, const void *buf, size_t len);
+  void (*udp_send)(struct mg_connection *nc, const void *buf, size_t len);
+
+  void (*recved)(struct mg_connection *nc, size_t len);
+
+  /* Perform interface-related connection initialization. Return 1 on ok. */
+  int (*create_conn)(struct mg_connection *nc);
+  /* Perform interface-related cleanup on connection before destruction. */
+  void (*destroy_conn)(struct mg_connection *nc);
+
+  /* Associate a socket to a connection. */
+  void (*sock_set)(struct mg_connection *nc, sock_t sock);
+
+  /* Put connection's address into *sa, local (remote = 0) or remote. */
+  void (*get_conn_addr)(struct mg_connection *nc, int remote,
+                        union socket_address *sa);
+};
+
+extern struct mg_iface_vtable *mg_ifaces[];
+extern int mg_num_ifaces;
+
+/* Creates a new interface instance. */
+struct mg_iface *mg_if_create_iface(struct mg_iface_vtable *vtable,
+                                    struct mg_mgr *mgr);
+
+/*
+ * Find an interface with a given implementation. The search is started from
+ * interface `from`, exclusive. Returns NULL if none is found.
+ */
+struct mg_iface *mg_find_iface(struct mg_mgr *mgr,
+                               struct mg_iface_vtable *vtable,
+                               struct mg_iface *from);
+/*
+ * Deliver a new TCP connection. Returns NULL in case on error (unable to
+ * create connection, in which case interface state should be discarded.
+ * This is phase 1 of the two-phase process - MG_EV_ACCEPT will be delivered
+ * when mg_if_accept_tcp_cb is invoked.
+ */
+struct mg_connection *mg_if_accept_new_conn(struct mg_connection *lc);
+void mg_if_accept_tcp_cb(struct mg_connection *nc, union socket_address *sa,
+                         size_t sa_len);
+
+/* Callback invoked by connect methods. err = 0 -> ok, != 0 -> error. */
+void mg_if_connect_cb(struct mg_connection *nc, int err);
+/* Callback that reports that data has been put on the wire. */
+void mg_if_sent_cb(struct mg_connection *nc, int num_sent);
+/*
+ * Receive callback.
+ * if `own` is true, buf must be heap-allocated and ownership is transferred
+ * to the core.
+ * Core will acknowledge consumption by calling iface::recved.
+ */
+void mg_if_recv_tcp_cb(struct mg_connection *nc, void *buf, int len, int own);
+/*
+ * Receive callback.
+ * buf must be heap-allocated and ownership is transferred to the core.
+ * Core will acknowledge consumption by calling iface::recved.
+ */
+void mg_if_recv_udp_cb(struct mg_connection *nc, void *buf, int len,
+                       union socket_address *sa, size_t sa_len);
+
+/* void mg_if_close_conn(struct mg_connection *nc); */
+
+/* Deliver a POLL event to the connection. */
+void mg_if_poll(struct mg_connection *nc, time_t now);
+
+/* Deliver a TIMER event to the connection. */
+void mg_if_timer(struct mg_connection *c, double now);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* CS_MONGOOSE_SRC_NET_IF_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/ssl_if.h"
+#endif
+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_MONGOOSE_SRC_SSL_IF_H_
+#define CS_MONGOOSE_SRC_SSL_IF_H_
+
+#if MG_ENABLE_SSL
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+struct mg_ssl_if_ctx;
+struct mg_connection;
+
+void mg_ssl_if_init();
+
+enum mg_ssl_if_result {
+  MG_SSL_OK = 0,
+  MG_SSL_WANT_READ = -1,
+  MG_SSL_WANT_WRITE = -2,
+  MG_SSL_ERROR = -3,
+};
+
+struct mg_ssl_if_conn_params {
+  const char *cert;
+  const char *key;
+  const char *ca_cert;
+  const char *server_name;
+  const char *cipher_suites;
+  const char *psk_identity;
+  const char *psk_key;
+};
+
+enum mg_ssl_if_result mg_ssl_if_conn_init(
+    struct mg_connection *nc, const struct mg_ssl_if_conn_params *params,
+    const char **err_msg);
+enum mg_ssl_if_result mg_ssl_if_conn_accept(struct mg_connection *nc,
+                                            struct mg_connection *lc);
+void mg_ssl_if_conn_free(struct mg_connection *nc);
+
+enum mg_ssl_if_result mg_ssl_if_handshake(struct mg_connection *nc);
+int mg_ssl_if_read(struct mg_connection *nc, void *buf, size_t buf_size);
+int mg_ssl_if_write(struct mg_connection *nc, const void *data, size_t len);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* MG_ENABLE_SSL */
+
+#endif /* CS_MONGOOSE_SRC_SSL_IF_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/net.h"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ * This software is dual-licensed: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation. For the terms of this
+ * license, see <http://www.gnu.org/licenses/>.
+ *
+ * You are free to use this software under the terms of the GNU General
+ * Public License, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * Alternatively, you can license this software under a commercial
+ * license, as set out in <https://www.cesanta.com/license>.
+ */
+
+/*
+ * === Core API: TCP/UDP/SSL
+ *
+ * NOTE: Mongoose manager is single threaded. It does not protect
+ * its data structures by mutexes, therefore all functions that are dealing
+ * with a particular event manager should be called from the same thread,
+ * with exception of the `mg_broadcast()` function. It is fine to have different
+ * event managers handled by different threads.
+ */
+
+#ifndef CS_MONGOOSE_SRC_NET_H_
+#define CS_MONGOOSE_SRC_NET_H_
+
+#if MG_ENABLE_JAVASCRIPT
+#define EXCLUDE_COMMON
+#include <v7.h>
+#endif
+
+/* Amalgamated: #include "mongoose/src/common.h" */
+/* Amalgamated: #include "mongoose/src/net_if.h" */
+/* Amalgamated: #include "common/mbuf.h" */
+
+#ifndef MG_VPRINTF_BUFFER_SIZE
+#define MG_VPRINTF_BUFFER_SIZE 100
+#endif
+
+#ifdef MG_USE_READ_WRITE
+#define MG_RECV_FUNC(s, b, l, f) read(s, b, l)
+#define MG_SEND_FUNC(s, b, l, f) write(s, b, l)
+#else
+#define MG_RECV_FUNC(s, b, l, f) recv(s, b, l, f)
+#define MG_SEND_FUNC(s, b, l, f) send(s, b, l, f)
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+union socket_address {
+  struct sockaddr sa;
+  struct sockaddr_in sin;
+#if MG_ENABLE_IPV6
+  struct sockaddr_in6 sin6;
+#else
+  struct sockaddr sin6;
+#endif
+};
+
+struct mg_connection;
+
+/*
+ * Callback function (event handler) prototype. Must be defined by the user.
+ * Mongoose calls the event handler, passing the events defined below.
+ */
+typedef void (*mg_event_handler_t)(struct mg_connection *nc, int ev,
+                                   void *ev_data);
+
+/* Events. Meaning of event parameter (evp) is given in the comment. */
+#define MG_EV_POLL 0    /* Sent to each connection on each mg_mgr_poll() call */
+#define MG_EV_ACCEPT 1  /* New connection accepted. union socket_address * */
+#define MG_EV_CONNECT 2 /* connect() succeeded or failed. int *  */
+#define MG_EV_RECV 3    /* Data has benn received. int *num_bytes */
+#define MG_EV_SEND 4    /* Data has been written to a socket. int *num_bytes */
+#define MG_EV_CLOSE 5   /* Connection is closed. NULL */
+#define MG_EV_TIMER 6   /* now >= conn->ev_timer_time. double * */
+
+/*
+ * Mongoose event manager.
+ */
+struct mg_mgr {
+  struct mg_connection *active_connections;
+#if MG_ENABLE_HEXDUMP
+  const char *hexdump_file; /* Debug hexdump file path */
+#endif
+#if MG_ENABLE_BROADCAST
+  sock_t ctl[2]; /* Socketpair for mg_broadcast() */
+#endif
+  void *user_data; /* User data */
+  int num_ifaces;
+  struct mg_iface **ifaces; /* network interfaces */
+#if MG_ENABLE_JAVASCRIPT
+  struct v7 *v7;
+#endif
+};
+
+/*
+ * Mongoose connection.
+ */
+struct mg_connection {
+  struct mg_connection *next, *prev; /* mg_mgr::active_connections linkage */
+  struct mg_connection *listener;    /* Set only for accept()-ed connections */
+  struct mg_mgr *mgr;                /* Pointer to containing manager */
+
+  sock_t sock; /* Socket to the remote peer */
+  int err;
+  union socket_address sa; /* Remote peer address */
+  size_t recv_mbuf_limit;  /* Max size of recv buffer */
+  struct mbuf recv_mbuf;   /* Received data */
+  struct mbuf send_mbuf;   /* Data scheduled for sending */
+  time_t last_io_time;     /* Timestamp of the last socket IO */
+  double ev_timer_time;    /* Timestamp of the future MG_EV_TIMER */
+#if MG_ENABLE_SSL
+  void *ssl_if_data; /* SSL library data. */
+#endif
+  mg_event_handler_t proto_handler; /* Protocol-specific event handler */
+  void *proto_data;                 /* Protocol-specific data */
+  void (*proto_data_destructor)(void *proto_data);
+  mg_event_handler_t handler; /* Event handler function */
+  void *user_data;            /* User-specific data */
+  union {
+    void *v;
+    /*
+     * the C standard is fussy about fitting function pointers into
+     * void pointers, since some archs might have fat pointers for functions.
+     */
+    mg_event_handler_t f;
+  } priv_1;
+  void *priv_2;
+  void *mgr_data; /* Implementation-specific event manager's data. */
+  struct mg_iface *iface;
+  unsigned long flags;
+/* Flags set by Mongoose */
+#define MG_F_LISTENING (1 << 0)          /* This connection is listening */
+#define MG_F_UDP (1 << 1)                /* This connection is UDP */
+#define MG_F_RESOLVING (1 << 2)          /* Waiting for async resolver */
+#define MG_F_CONNECTING (1 << 3)         /* connect() call in progress */
+#define MG_F_SSL (1 << 4)                /* SSL is enabled on the connection */
+#define MG_F_SSL_HANDSHAKE_DONE (1 << 5) /* SSL hanshake has completed */
+#define MG_F_WANT_READ (1 << 6)          /* SSL specific */
+#define MG_F_WANT_WRITE (1 << 7)         /* SSL specific */
+#define MG_F_IS_WEBSOCKET (1 << 8)       /* Websocket specific */
+
+/* Flags that are settable by user */
+#define MG_F_SEND_AND_CLOSE (1 << 10)       /* Push remaining data and close  */
+#define MG_F_CLOSE_IMMEDIATELY (1 << 11)    /* Disconnect */
+#define MG_F_WEBSOCKET_NO_DEFRAG (1 << 12)  /* Websocket specific */
+#define MG_F_DELETE_CHUNK (1 << 13)         /* HTTP specific */
+#define MG_F_ENABLE_BROADCAST (1 << 14)     /* Allow broadcast address usage */
+#define MG_F_TUN_DO_NOT_RECONNECT (1 << 15) /* Don't reconnect tunnel */
+
+#define MG_F_USER_1 (1 << 20) /* Flags left for application */
+#define MG_F_USER_2 (1 << 21)
+#define MG_F_USER_3 (1 << 22)
+#define MG_F_USER_4 (1 << 23)
+#define MG_F_USER_5 (1 << 24)
+#define MG_F_USER_6 (1 << 25)
+};
+
+/*
+ * Initialise Mongoose manager. Side effect: ignores SIGPIPE signal.
+ * `mgr->user_data` field will be initialised with a `user_data` parameter.
+ * That is an arbitrary pointer, where the user code can associate some data
+ * with the particular Mongoose manager. For example, a C++ wrapper class
+ * could be written in which case `user_data` can hold a pointer to the
+ * class instance.
+ */
+void mg_mgr_init(struct mg_mgr *mgr, void *user_data);
+
+/*
+ * Optional parameters to `mg_mgr_init_opt()`.
+ *
+ * If `main_iface` is not NULL, it will be used as the main interface in the
+ * default interface set. The pointer will be free'd by `mg_mgr_free`.
+ * Otherwise, the main interface will be autodetected based on the current
+ * platform.
+ *
+ * If `num_ifaces` is 0 and `ifaces` is NULL, the default interface set will be
+ * used.
+ * This is an advanced option, as it requires you to construct a full interface
+ * set, including special networking interfaces required by some optional
+ * features such as TCP tunneling. Memory backing `ifaces` and each of the
+ * `num_ifaces` pointers it contains will be reclaimed by `mg_mgr_free`.
+ */
+struct mg_mgr_init_opts {
+  struct mg_iface_vtable *main_iface;
+  int num_ifaces;
+  struct mg_iface_vtable **ifaces;
+};
+
+/*
+ * Like `mg_mgr_init` but with more options.
+ *
+ * Notably, this allows you to create a manger and choose
+ * dynamically which networking interface implementation to use.
+ */
+void mg_mgr_init_opt(struct mg_mgr *mgr, void *user_data,
+                     struct mg_mgr_init_opts opts);
+
+/*
+ * De-initialises Mongoose manager.
+ *
+ * Closes and deallocates all active connections.
+ */
+void mg_mgr_free(struct mg_mgr *);
+
+/*
+ * This function performs the actual IO and must be called in a loop
+ * (an event loop). It returns the current timestamp.
+ * `milli` is the maximum number of milliseconds to sleep.
+ * `mg_mgr_poll()` checks all connections for IO readiness. If at least one
+ * of the connections is IO-ready, `mg_mgr_poll()` triggers the respective
+ * event handlers and returns.
+ */
+time_t mg_mgr_poll(struct mg_mgr *, int milli);
+
+#if MG_ENABLE_BROADCAST
+/*
+ * Passes a message of a given length to all connections.
+ *
+ * Must be called from a thread that does NOT call `mg_mgr_poll()`.
+ * Note that `mg_broadcast()` is the only function
+ * that can be, and must be, called from a different (non-IO) thread.
+ *
+ * `func` callback function will be called by the IO thread for each
+ * connection. When called, the event will be `MG_EV_POLL`, and a message will
+ * be passed as the `ev_data` pointer. Maximum message size is capped
+ * by `MG_CTL_MSG_MESSAGE_SIZE` which is set to 8192 bytes.
+ */
+void mg_broadcast(struct mg_mgr *, mg_event_handler_t func, void *, size_t);
+#endif
+
+/*
+ * Iterates over all active connections.
+ *
+ * Returns the next connection from the list
+ * of active connections or `NULL` if there are no more connections. Below
+ * is the iteration idiom:
+ *
+ * ```c
+ * for (c = mg_next(srv, NULL); c != NULL; c = mg_next(srv, c)) {
+ *   // Do something with connection `c`
+ * }
+ * ```
+ */
+struct mg_connection *mg_next(struct mg_mgr *, struct mg_connection *);
+
+/*
+ * Optional parameters to `mg_add_sock_opt()`.
+ *
+ * `flags` is an initial `struct mg_connection::flags` bitmask to set,
+ * see `MG_F_*` flags definitions.
+ */
+struct mg_add_sock_opts {
+  void *user_data;           /* Initial value for connection's user_data */
+  unsigned int flags;        /* Initial connection flags */
+  const char **error_string; /* Placeholder for the error string */
+  struct mg_iface *iface;    /* Interface instance */
+};
+
+/*
+ * Creates a connection, associates it with the given socket and event handler
+ * and adds it to the manager.
+ *
+ * For more options see the `mg_add_sock_opt` variant.
+ */
+struct mg_connection *mg_add_sock(struct mg_mgr *, sock_t, mg_event_handler_t);
+
+/*
+ * Creates a connection, associates it with the given socket and event handler
+ * and adds to the manager.
+ *
+ * See the `mg_add_sock_opts` structure for a description of the options.
+ */
+struct mg_connection *mg_add_sock_opt(struct mg_mgr *, sock_t,
+                                      mg_event_handler_t,
+                                      struct mg_add_sock_opts);
+
+/*
+ * Optional parameters to `mg_bind_opt()`.
+ *
+ * `flags` is an initial `struct mg_connection::flags` bitmask to set,
+ * see `MG_F_*` flags definitions.
+ */
+struct mg_bind_opts {
+  void *user_data;           /* Initial value for connection's user_data */
+  unsigned int flags;        /* Extra connection flags */
+  const char **error_string; /* Placeholder for the error string */
+  struct mg_iface *iface;    /* Interface instance */
+#if MG_ENABLE_SSL
+  /*
+   * SSL settings.
+   *
+   * Server certificate to present to clients or client certificate to
+   * present to tunnel dispatcher (for tunneled connections).
+   */
+  const char *ssl_cert;
+  /* Private key corresponding to the certificate. If ssl_cert is set but
+   * ssl_key is not, ssl_cert is used. */
+  const char *ssl_key;
+  /* CA bundle used to verify client certificates or tunnel dispatchers. */
+  const char *ssl_ca_cert;
+  /* Colon-delimited list of acceptable cipher suites.
+   * Names depend on the library used, for example:
+   *
+   * ECDH-ECDSA-AES128-GCM-SHA256:DHE-RSA-AES128-SHA256 (OpenSSL)
+   * TLS-ECDH-ECDSA-WITH-AES-128-GCM-SHA256:TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
+   *   (mbedTLS)
+   *
+   * For OpenSSL the list can be obtained by running "openssl ciphers".
+   * For mbedTLS, names can be found in library/ssl_ciphersuites.c
+   * If NULL, a reasonable default is used.
+   */
+  const char *ssl_cipher_suites;
+#endif
+};
+
+/*
+ * Creates a listening connection.
+ *
+ * See `mg_bind_opt` for full documentation.
+ */
+struct mg_connection *mg_bind(struct mg_mgr *, const char *,
+                              mg_event_handler_t);
+/*
+ * Creates a listening connection.
+ *
+ * The `address` parameter specifies which address to bind to. It's format is
+ * the same as for the `mg_connect()` call, where `HOST` part is optional.
+ * `address` can be just a port number, e.g. `:8000`. To bind to a specific
+ * interface, an IP address can be specified, e.g. `1.2.3.4:8000`. By default,
+ * a TCP connection is created. To create UDP connection, prepend `udp://`
+ * prefix, e.g. `udp://:8000`. To summarize, `address` paramer has following
+ * format: `[PROTO://][IP_ADDRESS]:PORT`, where `PROTO` could be `tcp` or
+ * `udp`.
+ *
+ * See the `mg_bind_opts` structure for a description of the optional
+ * parameters.
+ *
+ * Returns a new listening connection or `NULL` on error.
+ * NOTE: The connection remains owned by the manager, do not free().
+ */
+struct mg_connection *mg_bind_opt(struct mg_mgr *mgr, const char *address,
+                                  mg_event_handler_t handler,
+                                  struct mg_bind_opts opts);
+
+/* Optional parameters to `mg_connect_opt()` */
+struct mg_connect_opts {
+  void *user_data;           /* Initial value for connection's user_data */
+  unsigned int flags;        /* Extra connection flags */
+  const char **error_string; /* Placeholder for the error string */
+  struct mg_iface *iface;    /* Interface instance */
+#if MG_ENABLE_SSL
+  /*
+   * SSL settings.
+   * Client certificate to present to the server.
+   */
+  const char *ssl_cert;
+  /*
+   * Private key corresponding to the certificate.
+   * If ssl_cert is set but ssl_key is not, ssl_cert is used.
+   */
+  const char *ssl_key;
+  /*
+   * Verify server certificate using this CA bundle. If set to "*", then SSL
+   * is enabled but no cert verification is performed.
+   */
+  const char *ssl_ca_cert;
+  /* Colon-delimited list of acceptable cipher suites.
+   * Names depend on the library used, for example:
+   *
+   * ECDH-ECDSA-AES128-GCM-SHA256:DHE-RSA-AES128-SHA256 (OpenSSL)
+   * TLS-ECDH-ECDSA-WITH-AES-128-GCM-SHA256:TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
+   *   (mbedTLS)
+   *
+   * For OpenSSL the list can be obtained by running "openssl ciphers".
+   * For mbedTLS, names can be found in library/ssl_ciphersuites.c
+   * If NULL, a reasonable default is used.
+   */
+  const char *ssl_cipher_suites;
+  /*
+   * Server name verification. If ssl_ca_cert is set and the certificate has
+   * passed verification, its subject will be verified against this string.
+   * By default (if ssl_server_name is NULL) hostname part of the address will
+   * be used. Wildcard matching is supported. A special value of "*" disables
+   * name verification.
+   */
+  const char *ssl_server_name;
+  /*
+   * PSK identity and key. Identity is a NUL-terminated string and key is a hex
+   * string. Key must be either 16 or 32 bytes (32 or 64 hex digits) for AES-128
+   * or AES-256 respectively.
+   * Note: Default list of cipher suites does not include PSK suites, if you
+   * want to use PSK you will need to set ssl_cipher_suites as well.
+   */
+  const char *ssl_psk_identity;
+  const char *ssl_psk_key;
+#endif
+};
+
+/*
+ * Connects to a remote host.
+ *
+ * See `mg_connect_opt()` for full documentation.
+ */
+struct mg_connection *mg_connect(struct mg_mgr *mgr, const char *address,
+                                 mg_event_handler_t handler);
+
+/*
+ * Connects to a remote host.
+ *
+ * The `address` format is `[PROTO://]HOST:PORT`. `PROTO` could be `tcp` or
+ * `udp`. `HOST` could be an IP address,
+ * IPv6 address (if Mongoose is compiled with `-DMG_ENABLE_IPV6`) or a host
+ * name. If `HOST` is a name, Mongoose will resolve it asynchronously. Examples
+ * of valid addresses: `google.com:80`, `udp://1.2.3.4:53`, `10.0.0.1:443`,
+ * `[::1]:80`
+ *
+ * See the `mg_connect_opts` structure for a description of the optional
+ * parameters.
+ *
+ * Returns a new outbound connection or `NULL` on error.
+ *
+ * NOTE: The connection remains owned by the manager, do not free().
+ *
+ * NOTE: To enable IPv6 addresses `-DMG_ENABLE_IPV6` should be specified
+ * in the compilation flags.
+ *
+ * NOTE: The new connection will receive `MG_EV_CONNECT` as its first event
+ * which will report the connect success status.
+ * If the asynchronous resolution fails or the `connect()` syscall fails for
+ * whatever reason (e.g. with `ECONNREFUSED` or `ENETUNREACH`), then
+ * `MG_EV_CONNECT` event will report failure. Code example below:
+ *
+ * ```c
+ * static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
+ *   int connect_status;
+ *
+ *   switch (ev) {
+ *     case MG_EV_CONNECT:
+ *       connect_status = * (int *) ev_data;
+ *       if (connect_status == 0) {
+ *         // Success
+ *       } else  {
+ *         // Error
+ *         printf("connect() error: %s\n", strerror(connect_status));
+ *       }
+ *       break;
+ *     ...
+ *   }
+ * }
+ *
+ *   ...
+ *   mg_connect(mgr, "my_site.com:80", ev_handler);
+ * ```
+ */
+struct mg_connection *mg_connect_opt(struct mg_mgr *mgr, const char *address,
+                                     mg_event_handler_t handler,
+                                     struct mg_connect_opts opts);
+
+#if MG_ENABLE_SSL && MG_NET_IF != MG_NET_IF_SIMPLELINK
+/*
+ * Note: This function is deprecated. Please, use SSL options in
+ * mg_connect_opt.
+ *
+ * Enables SSL for a given connection.
+ * `cert` is a server certificate file name for a listening connection
+ * or a client certificate file name for an outgoing connection.
+ * The certificate files must be in PEM format. The server certificate file
+ * must contain a certificate, concatenated with a private key, optionally
+ * concatenated with DH parameters.
+ * `ca_cert` is a CA certificate or NULL if peer verification is not
+ * required.
+ * Return: NULL on success or error message on error.
+ */
+const char *mg_set_ssl(struct mg_connection *nc, const char *cert,
+                       const char *ca_cert);
+#endif
+
+/*
+ * Sends data to the connection.
+ *
+ * Note that sending functions do not actually push data to the socket.
+ * They just append data to the output buffer. MG_EV_SEND will be delivered when
+ * the data has actually been pushed out.
+ */
+void mg_send(struct mg_connection *, const void *buf, int len);
+
+/* Enables format string warnings for mg_printf */
+#if defined(__GNUC__)
+__attribute__((format(printf, 2, 3)))
+#endif
+/* don't separate from mg_printf declaration */
+
+/*
+ * Sends `printf`-style formatted data to the connection.
+ *
+ * See `mg_send` for more details on send semantics.
+ */
+int mg_printf(struct mg_connection *, const char *fmt, ...);
+
+/* Same as `mg_printf()`, but takes `va_list ap` as an argument. */
+int mg_vprintf(struct mg_connection *, const char *fmt, va_list ap);
+
+/*
+ * Creates a socket pair.
+ * `sock_type` can be either `SOCK_STREAM` or `SOCK_DGRAM`.
+ * Returns 0 on failure and 1 on success.
+ */
+int mg_socketpair(sock_t[2], int sock_type);
+
+#if MG_ENABLE_SYNC_RESOLVER
+/*
+ * Convert domain name into IP address.
+ *
+ * This is a utility function. If compilation flags have
+ * `-DMG_ENABLE_GETADDRINFO`, then `getaddrinfo()` call is used for name
+ * resolution. Otherwise, `gethostbyname()` is used.
+ *
+ * CAUTION: this function can block.
+ * Return 1 on success, 0 on failure.
+ */
+int mg_resolve(const char *domain_name, char *ip_addr_buf, size_t buf_len);
+#endif
+
+/*
+ * Verify given IP address against the ACL.
+ *
+ * `remote_ip` - an IPv4 address to check, in host byte order
+ * `acl` - a comma separated list of IP subnets: `x.x.x.x/x` or `x.x.x.x`.
+ * Each subnet is
+ * prepended by either a - or a + sign. A plus sign means allow, where a
+ * minus sign means deny. If a subnet mask is omitted, such as `-1.2.3.4`,
+ * it means that only that single IP address is denied.
+ * Subnet masks may vary from 0 to 32, inclusive. The default setting
+ * is to allow all access. On each request the full list is traversed,
+ * and the last match wins. Example:
+ *
+ * `-0.0.0.0/0,+192.168/16` - deny all acccesses, only allow 192.168/16 subnet
+ *
+ * To learn more about subnet masks, see this
+ * link:https://en.wikipedia.org/wiki/Subnetwork[Wikipedia page on Subnetwork].
+ *
+ * Returns -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
+ */
+int mg_check_ip_acl(const char *acl, uint32_t remote_ip);
+
+#if MG_ENABLE_JAVASCRIPT
+/*
+ * Enables server-side JavaScript scripting.
+ * Requires a `-DMG_ENABLE_JAVASCRIPT` compilation flag and V7 engine sources.
+ * V7 instance must not be destroyed during manager's lifetime.
+ * Returns a V7 error.
+ */
+enum v7_err mg_enable_javascript(struct mg_mgr *m, struct v7 *v7,
+                                 const char *init_js_file_name);
+#endif
+
+/*
+ * Schedules an MG_EV_TIMER event to be delivered at `timestamp` time.
+ * `timestamp` is UNIX time (the number of seconds since Epoch). It is
+ * `double` instead of `time_t` to allow for sub-second precision.
+ * Returns the old timer value.
+ *
+ * Example: set the connect timeout to 1.5 seconds:
+ *
+ * ```
+ *  c = mg_connect(&mgr, "cesanta.com", ev_handler);
+ *  mg_set_timer(c, mg_time() + 1.5);
+ *  ...
+ *
+ *  void ev_handler(struct mg_connection *c, int ev, void *ev_data) {
+ *  switch (ev) {
+ *    case MG_EV_CONNECT:
+ *      mg_set_timer(c, 0);  // Clear connect timer
+ *      break;
+ *    case MG_EV_TIMER:
+ *      log("Connect timeout");
+ *      c->flags |= MG_F_CLOSE_IMMEDIATELY;
+ *      break;
+ * ```
+ */
+double mg_set_timer(struct mg_connection *c, double timestamp);
+
+/*
+ * A sub-second precision version of time().
+ */
+double mg_time(void);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* CS_MONGOOSE_SRC_NET_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/uri.h"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/*
+ * === URI
+ */
+
+#ifndef CS_MONGOOSE_SRC_URI_H_
+#define CS_MONGOOSE_SRC_URI_H_
+
+/* Amalgamated: #include "mongoose/src/net.h" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/*
+ * Parses an URI and fills string chunks with locations of the respective
+ * uri components within the input uri string. NULL pointers will be
+ * ignored.
+ *
+ * General syntax:
+ *
+ *     [scheme://[user_info@]]host[:port][/path][?query][#fragment]
+ *
+ * Example:
+ *
+ *     foo.com:80
+ *     tcp://foo.com:1234
+ *     http://foo.com:80/bar?baz=1
+ *     https://user:pw@foo.com:443/blah
+ *
+ * `path` will include the leading slash. `query` won't include the leading `?`.
+ * `host` can contain embedded colons if surrounded by square brackets in order
+ * to support IPv6 literal addresses.
+ *
+ *
+ * Returns 0 on success, -1 on error.
+ */
+int mg_parse_uri(struct mg_str uri, struct mg_str *scheme,
+                 struct mg_str *user_info, struct mg_str *host,
+                 unsigned int *port, struct mg_str *path, struct mg_str *query,
+                 struct mg_str *fragment);
+
+int mg_normalize_uri_path(const struct mg_str *in, struct mg_str *out);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* CS_MONGOOSE_SRC_URI_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/util.h"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/*
+ * === Utility API
+ */
+
+#ifndef CS_MONGOOSE_SRC_UTIL_H_
+#define CS_MONGOOSE_SRC_UTIL_H_
+
+#include <stdio.h>
+
+/* Amalgamated: #include "mongoose/src/common.h" */
+/* Amalgamated: #include "mongoose/src/net_if.h" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#ifndef MAX_PATH_SIZE
+#define MAX_PATH_SIZE 500
+#endif
+
+/*
+ * Fetches substring from input string `s`, `end` into `v`.
+ * Skips initial delimiter characters. Records first non-delimiter character
+ * at the beginning of substring `v`. Then scans the rest of the string
+ * until a delimiter character or end-of-string is found.
+ * `delimiters` is a 0-terminated string containing delimiter characters.
+ * Either one of `delimiters` or `end_string` terminates the search.
+ * Returns an `s` pointer, advanced forward where parsing has stopped.
+ */
+const char *mg_skip(const char *s, const char *end_string,
+                    const char *delimiters, struct mg_str *v);
+
+/*
+ * Decodes base64-encoded string `s`, `len` into the destination `dst`.
+ * The destination has to have enough space to hold the decoded buffer.
+ * Decoding stops either when all strings have been decoded or invalid an
+ * character appeared.
+ * Destination is '\0'-terminated.
+ * Returns the number of decoded characters. On success, that should be equal
+ * to `len`. On error (invalid character) the return value is smaller then
+ * `len`.
+ */
+int mg_base64_decode(const unsigned char *s, int len, char *dst);
+
+/*
+ * Base64-encode chunk of memory `src`, `src_len` into the destination `dst`.
+ * Destination has to have enough space to hold encoded buffer.
+ * Destination is '\0'-terminated.
+ */
+void mg_base64_encode(const unsigned char *src, int src_len, char *dst);
+
+#if MG_ENABLE_FILESYSTEM
+/*
+ * Performs a 64-bit `stat()` call against a given file.
+ *
+ * `path` should be UTF8 encoded.
+ *
+ * Return value is the same as for `stat()` syscall.
+ */
+int mg_stat(const char *path, cs_stat_t *st);
+
+/*
+ * Opens the given file and returns a file stream.
+ *
+ * `path` and `mode` should be UTF8 encoded.
+ *
+ * Return value is the same as for the `fopen()` call.
+ */
+FILE *mg_fopen(const char *path, const char *mode);
+
+/*
+ * Opens the given file and returns a file stream.
+ *
+ * `path` should be UTF8 encoded.
+ *
+ * Return value is the same as for the `open()` syscall.
+ */
+int mg_open(const char *path, int flag, int mode);
+#endif /* MG_ENABLE_FILESYSTEM */
+
+#if MG_ENABLE_THREADS
+/*
+ * Starts a new detached thread.
+ * Arguments and semantics are the same as pthead's `pthread_create()`.
+ * `thread_func` is a thread function, `thread_func_param` is a parameter
+ * that is passed to the thread function.
+ */
+void *mg_start_thread(void *(*thread_func)(void *), void *thread_func_param);
+#endif
+
+void mg_set_close_on_exec(sock_t);
+
+#define MG_SOCK_STRINGIFY_IP 1
+#define MG_SOCK_STRINGIFY_PORT 2
+#define MG_SOCK_STRINGIFY_REMOTE 4
+/*
+ * Converts a connection's local or remote address into string.
+ *
+ * The `flags` parameter is a bit mask that controls the behaviour,
+ * see `MG_SOCK_STRINGIFY_*` definitions.
+ *
+ * - MG_SOCK_STRINGIFY_IP - print IP address
+ * - MG_SOCK_STRINGIFY_PORT - print port number
+ * - MG_SOCK_STRINGIFY_REMOTE - print remote peer's IP/port, not local address
+ *
+ * If both port number and IP address are printed, they are separated by `:`.
+ * If compiled with `-DMG_ENABLE_IPV6`, IPv6 addresses are supported.
+ */
+void mg_conn_addr_to_str(struct mg_connection *nc, char *buf, size_t len,
+                         int flags);
+#if MG_NET_IF == MG_NET_IF_SOCKET
+/* Legacy interface. */
+void mg_sock_to_str(sock_t sock, char *buf, size_t len, int flags);
+#endif
+
+/*
+ * Convert the socket's address into string.
+ *
+ * `flags` is MG_SOCK_STRINGIFY_IP and/or MG_SOCK_STRINGIFY_PORT.
+ */
+void mg_sock_addr_to_str(const union socket_address *sa, char *buf, size_t len,
+                         int flags);
+
+#if MG_ENABLE_HEXDUMP
+/*
+ * Generates a human-readable hexdump of memory chunk.
+ *
+ * Takes a memory buffer `buf` of length `len` and creates a hex dump of that
+ * buffer in `dst`. The generated output is a-la hexdump(1).
+ * Returns the length of generated string, excluding terminating `\0`. If
+ * returned length is bigger than `dst_len`, the overflow bytes are discarded.
+ */
+int mg_hexdump(const void *buf, int len, char *dst, int dst_len);
+
+/* Same as mg_hexdump, but with output going to file instead of a buffer. */
+void mg_hexdumpf(FILE *fp, const void *buf, int len);
+
+/*
+ * Generates human-readable hexdump of the data sent or received by the
+ * connection. `path` is a file name where hexdump should be written.
+ * `num_bytes` is a number of bytes sent/received. `ev` is one of the `MG_*`
+ * events sent to an event handler. This function is supposed to be called from
+ * the event handler.
+ */
+void mg_hexdump_connection(struct mg_connection *nc, const char *path,
+                           const void *buf, int num_bytes, int ev);
+#endif
+
+/*
+ * Returns true if target platform is big endian.
+ */
+int mg_is_big_endian(void);
+
+/*
+ * A helper function for traversing a comma separated list of values.
+ * It returns a list pointer shifted to the next value or NULL if the end
+ * of the list found.
+ * The value is stored in a val vector. If the value has a form "x=y", then
+ * eq_val vector is initialised to point to the "y" part, and val vector length
+ * is adjusted to point only to "x".
+ * If the list is just a comma separated list of entries, like "aa,bb,cc" then
+ * `eq_val` will contain zero-length string.
+ *
+ * The purpose of this function is to parse comma separated string without
+ * any copying/memory allocation.
+ */
+const char *mg_next_comma_list_entry(const char *list, struct mg_str *val,
+                                     struct mg_str *eq_val);
+
+/*
+ * Matches 0-terminated string (mg_match_prefix) or string with given length
+ * mg_match_prefix_n against a glob pattern.
+ *
+ * Match is case-insensitive. Returns number of bytes matched, or -1 if no
+ * match.
+ */
+int mg_match_prefix(const char *pattern, int pattern_len, const char *str);
+int mg_match_prefix_n(const struct mg_str pattern, const struct mg_str str);
+
+/*
+ * Use with cs_base64_init/update/finish in order to write out base64 in chunks.
+ */
+void mg_mbuf_append_base64_putc(char ch, void *user_data);
+
+/*
+ * Encode `len` bytes starting at `data` as base64 and append them to an mbuf.
+ */
+void mg_mbuf_append_base64(struct mbuf *mbuf, const void *data, size_t len);
+
+/*
+ * Generate a Basic Auth header and appends it to buf.
+ * If pass is NULL, then user is expected to contain the credentials pair
+ * already encoded as `user:pass`.
+ */
+void mg_basic_auth_header(const char *user, const char *pass, struct mbuf *buf);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* CS_MONGOOSE_SRC_UTIL_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/http.h"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/*
+ * === Common API reference
+ */
+
+#ifndef CS_MONGOOSE_SRC_HTTP_H_
+#define CS_MONGOOSE_SRC_HTTP_H_
+
+#if MG_ENABLE_HTTP
+
+/* Amalgamated: #include "mongoose/src/net.h" */
+/* Amalgamated: #include "common/mg_str.h" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#ifndef MG_MAX_HTTP_HEADERS
+#define MG_MAX_HTTP_HEADERS 20
+#endif
+
+#ifndef MG_MAX_HTTP_REQUEST_SIZE
+#define MG_MAX_HTTP_REQUEST_SIZE 1024
+#endif
+
+#ifndef MG_MAX_PATH
+#ifdef PATH_MAX
+#define MG_MAX_PATH PATH_MAX
+#else
+#define MG_MAX_PATH 256
+#endif
+#endif
+
+#ifndef MG_MAX_HTTP_SEND_MBUF
+#define MG_MAX_HTTP_SEND_MBUF 1024
+#endif
+
+#ifndef MG_CGI_ENVIRONMENT_SIZE
+#define MG_CGI_ENVIRONMENT_SIZE 8192
+#endif
+
+/* HTTP message */
+struct http_message {
+  struct mg_str message; /* Whole message: request line + headers + body */
+
+  /* HTTP Request line (or HTTP response line) */
+  struct mg_str method; /* "GET" */
+  struct mg_str uri;    /* "/my_file.html" */
+  struct mg_str proto;  /* "HTTP/1.1" -- for both request and response */
+
+  /* For responses, code and response status message are set */
+  int resp_code;
+  struct mg_str resp_status_msg;
+
+  /*
+   * Query-string part of the URI. For example, for HTTP request
+   *    GET /foo/bar?param1=val1&param2=val2
+   *    |    uri    |     query_string     |
+   *
+   * Note that question mark character doesn't belong neither to the uri,
+   * nor to the query_string
+   */
+  struct mg_str query_string;
+
+  /* Headers */
+  struct mg_str header_names[MG_MAX_HTTP_HEADERS];
+  struct mg_str header_values[MG_MAX_HTTP_HEADERS];
+
+  /* Message body */
+  struct mg_str body; /* Zero-length for requests with no body */
+};
+
+#if MG_ENABLE_HTTP_WEBSOCKET
+/* WebSocket message */
+struct websocket_message {
+  unsigned char *data;
+  size_t size;
+  unsigned char flags;
+};
+#endif
+
+/* HTTP multipart part */
+struct mg_http_multipart_part {
+  const char *file_name;
+  const char *var_name;
+  struct mg_str data;
+  int status; /* <0 on error */
+  void *user_data;
+};
+
+/* SSI call context */
+struct mg_ssi_call_ctx {
+  struct http_message *req; /* The request being processed. */
+  struct mg_str file;       /* Filesystem path of the file being processed. */
+  struct mg_str arg; /* The argument passed to the tag: <!-- call arg -->. */
+};
+
+/* HTTP and websocket events. void *ev_data is described in a comment. */
+#define MG_EV_HTTP_REQUEST 100 /* struct http_message * */
+#define MG_EV_HTTP_REPLY 101   /* struct http_message * */
+#define MG_EV_HTTP_CHUNK 102   /* struct http_message * */
+#define MG_EV_SSI_CALL 105     /* char * */
+#define MG_EV_SSI_CALL_CTX 106 /* struct mg_ssi_call_ctx * */
+
+#if MG_ENABLE_HTTP_WEBSOCKET
+#define MG_EV_WEBSOCKET_HANDSHAKE_REQUEST 111 /* struct http_message * */
+#define MG_EV_WEBSOCKET_HANDSHAKE_DONE 112    /* NULL */
+#define MG_EV_WEBSOCKET_FRAME 113             /* struct websocket_message * */
+#define MG_EV_WEBSOCKET_CONTROL_FRAME 114     /* struct websocket_message * */
+#endif
+
+#if MG_ENABLE_HTTP_STREAMING_MULTIPART
+#define MG_EV_HTTP_MULTIPART_REQUEST 121 /* struct http_message */
+#define MG_EV_HTTP_PART_BEGIN 122        /* struct mg_http_multipart_part */
+#define MG_EV_HTTP_PART_DATA 123         /* struct mg_http_multipart_part */
+#define MG_EV_HTTP_PART_END 124          /* struct mg_http_multipart_part */
+/* struct mg_http_multipart_part */
+#define MG_EV_HTTP_MULTIPART_REQUEST_END 125
+#endif
+
+/*
+ * Attaches a built-in HTTP event handler to the given connection.
+ * The user-defined event handler will receive following extra events:
+ *
+ * - MG_EV_HTTP_REQUEST: HTTP request has arrived. Parsed HTTP request
+ *  is passed as
+ *   `struct http_message` through the handler's `void *ev_data` pointer.
+ * - MG_EV_HTTP_REPLY: The HTTP reply has arrived. The parsed HTTP reply is
+ *   passed as `struct http_message` through the handler's `void *ev_data`
+ *   pointer.
+ * - MG_EV_HTTP_CHUNK: The HTTP chunked-encoding chunk has arrived.
+ *   The parsed HTTP reply is passed as `struct http_message` through the
+ *   handler's `void *ev_data` pointer. `http_message::body` would contain
+ *   incomplete, reassembled HTTP body.
+ *   It will grow with every new chunk that arrives, and it can
+ *   potentially consume a lot of memory. An event handler may process
+ *   the body as chunks are coming, and signal Mongoose to delete processed
+ *   body by setting `MG_F_DELETE_CHUNK` in `mg_connection::flags`. When
+ *   the last zero chunk is received,
+ *   Mongoose sends `MG_EV_HTTP_REPLY` event with
+ *   full reassembled body (if handler did not signal to delete chunks) or
+ *   with empty body (if handler did signal to delete chunks).
+ * - MG_EV_WEBSOCKET_HANDSHAKE_REQUEST: server has received the WebSocket
+ *   handshake request. `ev_data` contains parsed HTTP request.
+ * - MG_EV_WEBSOCKET_HANDSHAKE_DONE: server has completed the WebSocket
+ *   handshake. `ev_data` is `NULL`.
+ * - MG_EV_WEBSOCKET_FRAME: new WebSocket frame has arrived. `ev_data` is
+ *   `struct websocket_message *`
+ *
+ * When compiled with MG_ENABLE_HTTP_STREAMING_MULTIPART, Mongoose parses
+ * multipart requests and splits them into separate events:
+ * - MG_EV_HTTP_MULTIPART_REQUEST: Start of the request.
+ *   This event is sent before body is parsed. After this, the user
+ *   should expect a sequence of PART_BEGIN/DATA/END requests.
+ *   This is also the last time when headers and other request fields are
+ *   accessible.
+ * - MG_EV_HTTP_PART_BEGIN: Start of a part of a multipart message.
+ *   Argument: mg_http_multipart_part with var_name and file_name set
+ *   (if present). No data is passed in this message.
+ * - MG_EV_HTTP_PART_DATA: new portion of data from the multipart message.
+ *   Argument: mg_http_multipart_part. var_name and file_name are preserved,
+ *   data is available in mg_http_multipart_part.data.
+ * - MG_EV_HTTP_PART_END: End of the current part. var_name, file_name are
+ *   the same, no data in the message. If status is 0, then the part is
+ *   properly terminated with a boundary, status < 0 means that connection
+ *   was terminated.
+ * - MG_EV_HTTP_MULTIPART_REQUEST_END: End of the multipart request.
+ *   Argument: mg_http_multipart_part, var_name and file_name are NULL,
+ *   status = 0 means request was properly closed, < 0 means connection
+ *   was terminated (note: in this case both PART_END and REQUEST_END are
+ *   delivered).
+ */
+void mg_set_protocol_http_websocket(struct mg_connection *nc);
+
+#if MG_ENABLE_HTTP_WEBSOCKET
+/*
+ * Send websocket handshake to the server.
+ *
+ * `nc` must be a valid connection, connected to a server. `uri` is an URI
+ * to fetch, extra_headers` is extra HTTP headers to send or `NULL`.
+ *
+ * This function is intended to be used by websocket client.
+ *
+ * Note that the Host header is mandatory in HTTP/1.1 and must be
+ * included in `extra_headers`. `mg_send_websocket_handshake2` offers
+ * a better API for that.
+ *
+ * Deprecated in favour of `mg_send_websocket_handshake2`
+ */
+void mg_send_websocket_handshake(struct mg_connection *nc, const char *uri,
+                                 const char *extra_headers);
+
+/*
+ * Send websocket handshake to the server.
+ *
+ * `nc` must be a valid connection, connected to a server. `uri` is an URI
+ * to fetch, `host` goes into the `Host` header, `protocol` goes into the
+ * `Sec-WebSocket-Proto` header (NULL to omit), extra_headers` is extra HTTP
+ * headers to send or `NULL`.
+ *
+ * This function is intended to be used by websocket client.
+ */
+void mg_send_websocket_handshake2(struct mg_connection *nc, const char *path,
+                                  const char *host, const char *protocol,
+                                  const char *extra_headers);
+
+/* Like mg_send_websocket_handshake2 but also passes basic auth header */
+void mg_send_websocket_handshake3(struct mg_connection *nc, const char *path,
+                                  const char *host, const char *protocol,
+                                  const char *extra_headers, const char *user,
+                                  const char *pass);
+/*
+ * Helper function that creates an outbound WebSocket connection.
+ *
+ * `url` is a URL to connect to. It must be properly URL-encoded, e.g. have
+ * no spaces, etc. By default, `mg_connect_ws()` sends Connection and
+ * Host headers. `extra_headers` is an extra HTTP header to send, e.g.
+ * `"User-Agent: my-app\r\n"`.
+ * If `protocol` is not NULL, then a `Sec-WebSocket-Protocol` header is sent.
+ *
+ * Examples:
+ *
+ * ```c
+ *   nc1 = mg_connect_ws(mgr, ev_handler_1, "ws://echo.websocket.org", NULL,
+ *                       NULL);
+ *   nc2 = mg_connect_ws(mgr, ev_handler_1, "wss://echo.websocket.org", NULL,
+ *                       NULL);
+ *   nc3 = mg_connect_ws(mgr, ev_handler_1, "ws://api.cesanta.com",
+ *                       "clubby.cesanta.com", NULL);
+ * ```
+ */
+struct mg_connection *mg_connect_ws(struct mg_mgr *mgr,
+                                    mg_event_handler_t event_handler,
+                                    const char *url, const char *protocol,
+                                    const char *extra_headers);
+
+/*
+ * Helper function that creates an outbound WebSocket connection
+ *
+ * Mostly identical to `mg_connect_ws`, but allows to provide extra parameters
+ * (for example, SSL parameters)
+ */
+struct mg_connection *mg_connect_ws_opt(struct mg_mgr *mgr,
+                                        mg_event_handler_t ev_handler,
+                                        struct mg_connect_opts opts,
+                                        const char *url, const char *protocol,
+                                        const char *extra_headers);
+
+/*
+ * Send WebSocket frame to the remote end.
+ *
+ * `op_and_flags` specifies the frame's type. It's one of:
+ *
+ * - WEBSOCKET_OP_CONTINUE
+ * - WEBSOCKET_OP_TEXT
+ * - WEBSOCKET_OP_BINARY
+ * - WEBSOCKET_OP_CLOSE
+ * - WEBSOCKET_OP_PING
+ * - WEBSOCKET_OP_PONG
+ *
+ * Orred with one of the flags:
+ *
+ * - WEBSOCKET_DONT_FIN: Don't set the FIN flag on the frame to be sent.
+ *
+ * `data` and `data_len` contain frame data.
+ */
+void mg_send_websocket_frame(struct mg_connection *nc, int op_and_flags,
+                             const void *data, size_t data_len);
+
+/*
+ * Sends multiple websocket frames.
+ *
+ * Like `mg_send_websocket_frame()`, but composes a frame from multiple buffers.
+ */
+void mg_send_websocket_framev(struct mg_connection *nc, int op_and_flags,
+                              const struct mg_str *strings, int num_strings);
+
+/*
+ * Sends WebSocket frame to the remote end.
+ *
+ * Like `mg_send_websocket_frame()`, but allows to create formatted messages
+ * with `printf()`-like semantics.
+ */
+void mg_printf_websocket_frame(struct mg_connection *nc, int op_and_flags,
+                               const char *fmt, ...);
+
+/* Websocket opcodes, from http://tools.ietf.org/html/rfc6455 */
+#define WEBSOCKET_OP_CONTINUE 0
+#define WEBSOCKET_OP_TEXT 1
+#define WEBSOCKET_OP_BINARY 2
+#define WEBSOCKET_OP_CLOSE 8
+#define WEBSOCKET_OP_PING 9
+#define WEBSOCKET_OP_PONG 10
+
+/*
+ * If set causes the FIN flag to not be set on outbound
+ * frames. This enables sending multiple fragments of a single
+ * logical message.
+ *
+ * The WebSocket protocol mandates that if the FIN flag of a data
+ * frame is not set, the next frame must be a WEBSOCKET_OP_CONTINUE.
+ * The last frame must have the FIN bit set.
+ *
+ * Note that mongoose will automatically defragment incoming messages,
+ * so this flag is used only on outbound messages.
+ */
+#define WEBSOCKET_DONT_FIN 0x100
+
+#endif /* MG_ENABLE_HTTP_WEBSOCKET */
+
+/*
+ * Decodes a URL-encoded string.
+ *
+ * Source string is specified by (`src`, `src_len`), and destination is
+ * (`dst`, `dst_len`). If `is_form_url_encoded` is non-zero, then
+ * `+` character is decoded as a blank space character. This function
+ * guarantees to NUL-terminate the destination. If destination is too small,
+ * then the source string is partially decoded and `-1` is returned. Otherwise,
+ * a length of the decoded string is returned, not counting final NUL.
+ */
+int mg_url_decode(const char *src, int src_len, char *dst, int dst_len,
+                  int is_form_url_encoded);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* MG_ENABLE_HTTP */
+
+#endif /* CS_MONGOOSE_SRC_HTTP_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/http_server.h"
+#endif
+/*
+ * === Server API reference
+ */
+
+#ifndef CS_MONGOOSE_SRC_HTTP_SERVER_H_
+#define CS_MONGOOSE_SRC_HTTP_SERVER_H_
+
+#if MG_ENABLE_HTTP
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/*
+ * Parses a HTTP message.
+ *
+ * `is_req` should be set to 1 if parsing a request, 0 if reply.
+ *
+ * Returns the number of bytes parsed. If HTTP message is
+ * incomplete `0` is returned. On parse error, a negative number is returned.
+ */
+int mg_parse_http(const char *s, int n, struct http_message *hm, int is_req);
+
+/*
+ * Searches and returns the header `name` in parsed HTTP message `hm`.
+ * If header is not found, NULL is returned. Example:
+ *
+ *     struct mg_str *host_hdr = mg_get_http_header(hm, "Host");
+ */
+struct mg_str *mg_get_http_header(struct http_message *hm, const char *name);
+
+/*
+ * Parses the HTTP header `hdr`. Finds variable `var_name` and stores its value
+ * in the buffer `buf`, `buf_size`. Returns 0 if variable not found, non-zero
+ * otherwise.
+ *
+ * This function is supposed to parse cookies, authentication headers, etc.
+ * Example (error handling omitted):
+ *
+ *     char user[20];
+ *     struct mg_str *hdr = mg_get_http_header(hm, "Authorization");
+ *     mg_http_parse_header(hdr, "username", user, sizeof(user));
+ *
+ * Returns the length of the variable's value. If buffer is not large enough,
+ * or variable not found, 0 is returned.
+ */
+int mg_http_parse_header(struct mg_str *hdr, const char *var_name, char *buf,
+                         size_t buf_size);
+
+/*
+ * Gets and parses the Authorization: Basic header
+ * Returns -1 if no Authorization header is found, or if
+ * mg_parse_http_basic_auth
+ * fails parsing the resulting header.
+ */
+int mg_get_http_basic_auth(struct http_message *hm, char *user, size_t user_len,
+                           char *pass, size_t pass_len);
+
+/*
+ * Parses the Authorization: Basic header
+ * Returns -1 iif the authorization type is not "Basic" or any other error such
+ * as incorrectly encoded base64 user password pair.
+ */
+int mg_parse_http_basic_auth(struct mg_str *hdr, char *user, size_t user_len,
+                             char *pass, size_t pass_len);
+
+/*
+ * Parses the buffer `buf`, `buf_len` that contains multipart form data chunks.
+ * Stores the chunk name in a `var_name`, `var_name_len` buffer.
+ * If a chunk is an uploaded file, then `file_name`, `file_name_len` is
+ * filled with an uploaded file name. `chunk`, `chunk_len`
+ * points to the chunk data.
+ *
+ * Return: number of bytes to skip to the next chunk or 0 if there are
+ *         no more chunks.
+ *
+ * Usage example:
+ *
+ * ```c
+ *    static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
+ *      switch(ev) {
+ *        case MG_EV_HTTP_REQUEST: {
+ *          struct http_message *hm = (struct http_message *) ev_data;
+ *          char var_name[100], file_name[100];
+ *          const char *chunk;
+ *          size_t chunk_len, n1, n2;
+ *
+ *          n1 = n2 = 0;
+ *          while ((n2 = mg_parse_multipart(hm->body.p + n1,
+ *                                          hm->body.len - n1,
+ *                                          var_name, sizeof(var_name),
+ *                                          file_name, sizeof(file_name),
+ *                                          &chunk, &chunk_len)) > 0) {
+ *            printf("var: %s, file_name: %s, size: %d, chunk: [%.*s]\n",
+ *                   var_name, file_name, (int) chunk_len,
+ *                   (int) chunk_len, chunk);
+ *            n1 += n2;
+ *          }
+ *        }
+ *        break;
+ * ```
+ */
+size_t mg_parse_multipart(const char *buf, size_t buf_len, char *var_name,
+                          size_t var_name_len, char *file_name,
+                          size_t file_name_len, const char **chunk,
+                          size_t *chunk_len);
+
+/*
+ * Fetches a HTTP form variable.
+ *
+ * Fetches a variable `name` from a `buf` into a buffer specified by `dst`,
+ * `dst_len`. The destination is always zero-terminated. Returns the length of
+ * a fetched variable. If not found, 0 is returned. `buf` must be valid
+ * url-encoded buffer. If destination is too small, `-1` is returned.
+ */
+int mg_get_http_var(const struct mg_str *buf, const char *name, char *dst,
+                    size_t dst_len);
+
+#if MG_ENABLE_FILESYSTEM
+/*
+ * This structure defines how `mg_serve_http()` works.
+ * Best practice is to set only required settings, and leave the rest as NULL.
+ */
+struct mg_serve_http_opts {
+  /* Path to web root directory */
+  const char *document_root;
+
+  /* List of index files. Default is "" */
+  const char *index_files;
+
+  /*
+   * Leave as NULL to disable authentication.
+   * To enable directory protection with authentication, set this to ".htpasswd"
+   * Then, creating ".htpasswd" file in any directory automatically protects
+   * it with digest authentication.
+   * Use `mongoose` web server binary, or `htdigest` Apache utility to
+   * create/manipulate passwords file.
+   * Make sure `auth_domain` is set to a valid domain name.
+   */
+  const char *per_directory_auth_file;
+
+  /* Authorization domain (domain name of this web server) */
+  const char *auth_domain;
+
+  /*
+   * Leave as NULL to disable authentication.
+   * Normally, only selected directories in the document root are protected.
+   * If absolutely every access to the web server needs to be authenticated,
+   * regardless of the URI, set this option to the path to the passwords file.
+   * Format of that file is the same as ".htpasswd" file. Make sure that file
+   * is located outside document root to prevent people fetching it.
+   */
+  const char *global_auth_file;
+
+  /* Set to "no" to disable directory listing. Enabled by default. */
+  const char *enable_directory_listing;
+
+  /*
+   * SSI files pattern. If not set, "**.shtml$|**.shtm$" is used.
+   *
+   * All files that match ssi_pattern are treated as SSI.
+   *
+   * Server Side Includes (SSI) is a simple interpreted server-side scripting
+   * language which is most commonly used to include the contents of a file
+   * into a web page. It can be useful when it is desirable to include a common
+   * piece of code throughout a website, for example, headers and footers.
+   *
+   * In order for a webpage to recognize an SSI-enabled HTML file, the
+   * filename should end with a special extension, by default the extension
+   * should be either .shtml or .shtm
+   *
+   * Unknown SSI directives are silently ignored by Mongoose. Currently,
+   * the following SSI directives are supported:
+   *    &lt;!--#include FILE_TO_INCLUDE --&gt;
+   *    &lt;!--#exec "COMMAND_TO_EXECUTE" --&gt;
+   *    &lt;!--#call COMMAND --&gt;
+   *
+   * Note that &lt;!--#include ...> directive supports three path
+   *specifications:
+   *
+   * &lt;!--#include virtual="path" --&gt;  Path is relative to web server root
+   * &lt;!--#include abspath="path" --&gt;  Path is absolute or relative to the
+   *                                  web server working dir
+   * &lt;!--#include file="path" --&gt;,    Path is relative to current document
+   * &lt;!--#include "path" --&gt;
+   *
+   * The include directive may be used to include the contents of a file or
+   * the result of running a CGI script.
+   *
+   * The exec directive is used to execute
+   * a command on a server, and show command's output. Example:
+   *
+   * &lt;!--#exec "ls -l" --&gt;
+   *
+   * The call directive is a way to invoke a C handler from the HTML page.
+   * On each occurence of &lt;!--#call COMMAND OPTIONAL_PARAMS> directive,
+   * Mongoose calls a registered event handler with MG_EV_SSI_CALL event,
+   * and event parameter will point to the COMMAND OPTIONAL_PARAMS string.
+   * An event handler can output any text, for example by calling
+   * `mg_printf()`. This is a flexible way of generating a web page on
+   * server side by calling a C event handler. Example:
+   *
+   * &lt;!--#call foo --&gt; ... &lt;!--#call bar --&gt;
+   *
+   * In the event handler:
+   *    case MG_EV_SSI_CALL: {
+   *      const char *param = (const char *) ev_data;
+   *      if (strcmp(param, "foo") == 0) {
+   *        mg_printf(c, "hello from foo");
+   *      } else if (strcmp(param, "bar") == 0) {
+   *        mg_printf(c, "hello from bar");
+   *      }
+   *      break;
+   *    }
+   */
+  const char *ssi_pattern;
+
+  /* IP ACL. By default, NULL, meaning all IPs are allowed to connect */
+  const char *ip_acl;
+
+#if MG_ENABLE_HTTP_URL_REWRITES
+  /* URL rewrites.
+   *
+   * Comma-separated list of `uri_pattern=url_file_or_directory_path` rewrites.
+   * When HTTP request is received, Mongoose constructs a file name from the
+   * requested URI by combining `document_root` and the URI. However, if the
+   * rewrite option is used and `uri_pattern` matches requested URI, then
+   * `document_root` is ignored. Instead, `url_file_or_directory_path` is used,
+   * which should be a full path name or a path relative to the web server's
+   * current working directory. It can also be an URI (http:// or https://)
+   * in which case mongoose will behave as a reverse proxy for that destination.
+   *
+   * Note that `uri_pattern`, as all Mongoose patterns, is a prefix pattern.
+   *
+   * If uri_pattern starts with `@` symbol, then Mongoose compares it with the
+   * HOST header of the request. If they are equal, Mongoose sets document root
+   * to `file_or_directory_path`, implementing virtual hosts support.
+   * Example: `@foo.com=/document/root/for/foo.com`
+   *
+   * If `uri_pattern` starts with `%` symbol, then Mongoose compares it with
+   * the listening port. If they match, then Mongoose issues a 301 redirect.
+   * For example, to redirect all HTTP requests to the
+   * HTTPS port, do `%80=https://my.site.com`. Note that the request URI is
+   * automatically appended to the redirect location.
+   */
+  const char *url_rewrites;
+#endif
+
+  /* DAV document root. If NULL, DAV requests are going to fail. */
+  const char *dav_document_root;
+
+  /*
+   * DAV passwords file. If NULL, DAV requests are going to fail.
+   * If passwords file is set to "-", then DAV auth is disabled.
+   */
+  const char *dav_auth_file;
+
+  /* Glob pattern for the files to hide. */
+  const char *hidden_file_pattern;
+
+  /* Set to non-NULL to enable CGI, e.g. **.cgi$|**.php$" */
+  const char *cgi_file_pattern;
+
+  /* If not NULL, ignore CGI script hashbang and use this interpreter */
+  const char *cgi_interpreter;
+
+  /*
+   * Comma-separated list of Content-Type overrides for path suffixes, e.g.
+   * ".txt=text/plain; charset=utf-8,.c=text/plain"
+   */
+  const char *custom_mime_types;
+
+  /*
+   * Extra HTTP headers to add to each server response.
+   * Example: to enable CORS, set this to "Access-Control-Allow-Origin: *".
+   */
+  const char *extra_headers;
+};
+
+/*
+ * Serves given HTTP request according to the `options`.
+ *
+ * Example code snippet:
+ *
+ * ```c
+ * static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
+ *   struct http_message *hm = (struct http_message *) ev_data;
+ *   struct mg_serve_http_opts opts = { .document_root = "/var/www" };  // C99
+ *
+ *   switch (ev) {
+ *     case MG_EV_HTTP_REQUEST:
+ *       mg_serve_http(nc, hm, opts);
+ *       break;
+ *     default:
+ *       break;
+ *   }
+ * }
+ * ```
+ */
+void mg_serve_http(struct mg_connection *nc, struct http_message *hm,
+                   struct mg_serve_http_opts opts);
+
+/*
+ * Serves a specific file with a given MIME type and optional extra headers.
+ *
+ * Example code snippet:
+ *
+ * ```c
+ * static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
+ *   switch (ev) {
+ *     case MG_EV_HTTP_REQUEST: {
+ *       struct http_message *hm = (struct http_message *) ev_data;
+ *       mg_http_serve_file(nc, hm, "file.txt",
+ *                          mg_mk_str("text/plain"), mg_mk_str(""));
+ *       break;
+ *     }
+ *     ...
+ *   }
+ * }
+ * ```
+ */
+void mg_http_serve_file(struct mg_connection *nc, struct http_message *hm,
+                        const char *path, const struct mg_str mime_type,
+                        const struct mg_str extra_headers);
+
+#if MG_ENABLE_HTTP_STREAMING_MULTIPART
+
+/* Callback prototype for `mg_file_upload_handler()`. */
+typedef struct mg_str (*mg_fu_fname_fn)(struct mg_connection *nc,
+                                        struct mg_str fname);
+
+/*
+ * File upload handler.
+ * This handler can be used to implement file uploads with minimum code.
+ * This handler will process MG_EV_HTTP_PART_* events and store file data into
+ * a local file.
+ * `local_name_fn` will be invoked with whatever name was provided by the client
+ * and will expect the name of the local file to open. A return value of NULL
+ * will abort file upload (client will get a "403 Forbidden" response). If
+ * non-null, the returned string must be heap-allocated and will be freed by
+ * the caller.
+ * Exception: it is ok to return the same string verbatim.
+ *
+ * Example:
+ *
+ * ```c
+ * struct mg_str upload_fname(struct mg_connection *nc, struct mg_str fname) {
+ *   // Just return the same filename. Do not actually do this except in test!
+ *   // fname is user-controlled and needs to be sanitized.
+ *   return fname;
+ * }
+ * void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
+ *   switch (ev) {
+ *     ...
+ *     case MG_EV_HTTP_PART_BEGIN:
+ *     case MG_EV_HTTP_PART_DATA:
+ *     case MG_EV_HTTP_PART_END:
+ *       mg_file_upload_handler(nc, ev, ev_data, upload_fname);
+ *       break;
+ *   }
+ * }
+ * ```
+ */
+void mg_file_upload_handler(struct mg_connection *nc, int ev, void *ev_data,
+                            mg_fu_fname_fn local_name_fn);
+#endif /* MG_ENABLE_HTTP_STREAMING_MULTIPART */
+#endif /* MG_ENABLE_FILESYSTEM */
+
+/*
+ * Registers a callback for a specified http endpoint
+ * Note: if callback is registered it is called instead of the
+ * callback provided in mg_bind
+ *
+ * Example code snippet:
+ *
+ * ```c
+ * static void handle_hello1(struct mg_connection *nc, int ev, void *ev_data) {
+ *   (void) ev; (void) ev_data;
+ *   mg_printf(nc, "HTTP/1.0 200 OK\r\n\r\n[I am Hello1]");
+ *  nc->flags |= MG_F_SEND_AND_CLOSE;
+ * }
+ *
+ * static void handle_hello1(struct mg_connection *nc, int ev, void *ev_data) {
+ *  (void) ev; (void) ev_data;
+ *   mg_printf(nc, "HTTP/1.0 200 OK\r\n\r\n[I am Hello2]");
+ *  nc->flags |= MG_F_SEND_AND_CLOSE;
+ * }
+ *
+ * void init() {
+ *   nc = mg_bind(&mgr, local_addr, cb1);
+ *   mg_register_http_endpoint(nc, "/hello1", handle_hello1);
+ *   mg_register_http_endpoint(nc, "/hello1/hello2", handle_hello2);
+ * }
+ * ```
+ */
+void mg_register_http_endpoint(struct mg_connection *nc, const char *uri_path,
+                               mg_event_handler_t handler);
+
+/*
+ * Authenticates a HTTP request against an opened password file.
+ * Returns 1 if authenticated, 0 otherwise.
+ */
+int mg_http_check_digest_auth(struct http_message *hm, const char *auth_domain,
+                              FILE *fp);
+
+/*
+ * Sends buffer `buf` of size `len` to the client using chunked HTTP encoding.
+ * This function sends the buffer size as hex number + newline first, then
+ * the buffer itself, then the newline. For example,
+ * `mg_send_http_chunk(nc, "foo", 3)` whill append the `3\r\nfoo\r\n` string
+ * to the `nc->send_mbuf` output IO buffer.
+ *
+ * NOTE: The HTTP header "Transfer-Encoding: chunked" should be sent prior to
+ * using this function.
+ *
+ * NOTE: do not forget to send an empty chunk at the end of the response,
+ * to tell the client that everything was sent. Example:
+ *
+ * ```
+ *   mg_printf_http_chunk(nc, "%s", "my response!");
+ *   mg_send_http_chunk(nc, "", 0); // Tell the client we're finished
+ * ```
+ */
+void mg_send_http_chunk(struct mg_connection *nc, const char *buf, size_t len);
+
+/*
+ * Sends a printf-formatted HTTP chunk.
+ * Functionality is similar to `mg_send_http_chunk()`.
+ */
+void mg_printf_http_chunk(struct mg_connection *nc, const char *fmt, ...);
+
+/*
+ * Sends the response status line.
+ * If `extra_headers` is not NULL, then `extra_headers` are also sent
+ * after the reponse line. `extra_headers` must NOT end end with new line.
+ * Example:
+ *
+ *      mg_send_response_line(nc, 200, "Access-Control-Allow-Origin: *");
+ *
+ * Will result in:
+ *
+ *      HTTP/1.1 200 OK\r\n
+ *      Access-Control-Allow-Origin: *\r\n
+ */
+void mg_send_response_line(struct mg_connection *nc, int status_code,
+                           const char *extra_headers);
+
+/*
+ * Sends an error response. If reason is NULL, the message will be inferred
+ * from the error code (if supported).
+ */
+void mg_http_send_error(struct mg_connection *nc, int code, const char *reason);
+
+/*
+ * Sends a redirect response.
+ * `status_code` should be either 301 or 302 and `location` point to the
+ * new location.
+ * If `extra_headers` is not empty, then `extra_headers` are also sent
+ * after the reponse line. `extra_headers` must NOT end end with new line.
+ *
+ * Example:
+ *
+ *      mg_http_send_redirect(nc, 302, mg_mk_str("/login"), mg_mk_str(NULL));
+ */
+void mg_http_send_redirect(struct mg_connection *nc, int status_code,
+                           const struct mg_str location,
+                           const struct mg_str extra_headers);
+
+/*
+ * Sends the response line and headers.
+ * This function sends the response line with the `status_code`, and
+ * automatically
+ * sends one header: either "Content-Length" or "Transfer-Encoding".
+ * If `content_length` is negative, then "Transfer-Encoding: chunked" header
+ * is sent, otherwise, "Content-Length" header is sent.
+ *
+ * NOTE: If `Transfer-Encoding` is `chunked`, then message body must be sent
+ * using `mg_send_http_chunk()` or `mg_printf_http_chunk()` functions.
+ * Otherwise, `mg_send()` or `mg_printf()` must be used.
+ * Extra headers could be set through `extra_headers`. Note `extra_headers`
+ * must NOT be terminated by a new line.
+ */
+void mg_send_head(struct mg_connection *n, int status_code,
+                  int64_t content_length, const char *extra_headers);
+
+/*
+ * Sends a printf-formatted HTTP chunk, escaping HTML tags.
+ */
+void mg_printf_html_escape(struct mg_connection *nc, const char *fmt, ...);
+
+#if MG_ENABLE_HTTP_URL_REWRITES
+/*
+ * Proxies a given request to a given upstream http server. The path prefix
+ * in `mount` will be stripped of the path requested to the upstream server,
+ * e.g. if mount is /api and upstream is http://localhost:8001/foo
+ * then an incoming request to /api/bar will cause a request to
+ * http://localhost:8001/foo/bar
+ *
+ * EXPERIMENTAL API. Please use http_serve_http + url_rewrites if a static
+ * mapping is good enough.
+ */
+void mg_http_reverse_proxy(struct mg_connection *nc,
+                           const struct http_message *hm, struct mg_str mount,
+                           struct mg_str upstream);
+#endif
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* MG_ENABLE_HTTP */
+
+#endif /* CS_MONGOOSE_SRC_HTTP_SERVER_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/http_client.h"
+#endif
+/*
+ * === Client API reference
+ */
+
+#ifndef CS_MONGOOSE_SRC_HTTP_CLIENT_H_
+#define CS_MONGOOSE_SRC_HTTP_CLIENT_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/*
+ * Helper function that creates an outbound HTTP connection.
+ *
+ * `url` is the URL to fetch. It must be properly URL-encoded, e.g. have
+ * no spaces, etc. By default, `mg_connect_http()` sends the Connection and
+ * Host headers. `extra_headers` is an extra HTTP header to send, e.g.
+ * `"User-Agent: my-app\r\n"`.
+ * If `post_data` is NULL, then a GET request is created. Otherwise, a POST
+ * request is created with the specified POST data. Note that if the data being
+ * posted is a form submission, the `Content-Type` header should be set
+ * accordingly (see example below).
+ *
+ * Examples:
+ *
+ * ```c
+ *   nc1 = mg_connect_http(mgr, ev_handler_1, "http://www.google.com", NULL,
+ *                         NULL);
+ *   nc2 = mg_connect_http(mgr, ev_handler_1, "https://github.com", NULL, NULL);
+ *   nc3 = mg_connect_http(
+ *       mgr, ev_handler_1, "my_server:8000/form_submit/",
+ *       "Content-Type: application/x-www-form-urlencoded\r\n",
+ *       "var_1=value_1&var_2=value_2");
+ * ```
+ */
+struct mg_connection *mg_connect_http(struct mg_mgr *mgr,
+                                      mg_event_handler_t event_handler,
+                                      const char *url,
+                                      const char *extra_headers,
+                                      const char *post_data);
+
+/*
+ * Helper function that creates an outbound HTTP connection.
+ *
+ * Mostly identical to mg_connect_http, but allows you to provide extra
+ *parameters
+ * (for example, SSL parameters)
+ */
+struct mg_connection *mg_connect_http_opt(struct mg_mgr *mgr,
+                                          mg_event_handler_t ev_handler,
+                                          struct mg_connect_opts opts,
+                                          const char *url,
+                                          const char *extra_headers,
+                                          const char *post_data);
+
+/* Creates digest authentication header for a client request. */
+int mg_http_create_digest_auth_header(char *buf, size_t buf_len,
+                                      const char *method, const char *uri,
+                                      const char *auth_domain, const char *user,
+                                      const char *passwd);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* CS_MONGOOSE_SRC_HTTP_CLIENT_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/mqtt.h"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ * This software is dual-licensed: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation. For the terms of this
+ * license, see <http://www.gnu.org/licenses/>.
+ *
+ * You are free to use this software under the terms of the GNU General
+ * Public License, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * Alternatively, you can license this software under a commercial
+ * license, as set out in <https://www.cesanta.com/license>.
+ */
+
+/*
+ * === MQTT API reference
+ */
+
+#ifndef CS_MONGOOSE_SRC_MQTT_H_
+#define CS_MONGOOSE_SRC_MQTT_H_
+
+/* Amalgamated: #include "mongoose/src/net.h" */
+
+struct mg_mqtt_message {
+  int cmd;
+  int qos;
+  struct mg_str topic;
+  struct mg_str payload;
+
+  uint8_t connack_ret_code; /* connack */
+  uint16_t message_id;      /* puback */
+
+  /* connect */
+  uint8_t protocol_version;
+  uint8_t connect_flags;
+  uint16_t keep_alive_timer;
+  struct mg_str protocol_name;
+  struct mg_str client_id;
+  struct mg_str will_topic;
+  struct mg_str will_message;
+  struct mg_str user_name;
+  struct mg_str password;
+};
+
+struct mg_mqtt_topic_expression {
+  const char *topic;
+  uint8_t qos;
+};
+
+struct mg_send_mqtt_handshake_opts {
+  unsigned char flags; /* connection flags */
+  uint16_t keep_alive;
+  const char *will_topic;
+  const char *will_message;
+  const char *user_name;
+  const char *password;
+};
+
+/* mg_mqtt_proto_data should be in header to allow external access to it */
+struct mg_mqtt_proto_data {
+  uint16_t keep_alive;
+};
+
+/* Message types */
+#define MG_MQTT_CMD_CONNECT 1
+#define MG_MQTT_CMD_CONNACK 2
+#define MG_MQTT_CMD_PUBLISH 3
+#define MG_MQTT_CMD_PUBACK 4
+#define MG_MQTT_CMD_PUBREC 5
+#define MG_MQTT_CMD_PUBREL 6
+#define MG_MQTT_CMD_PUBCOMP 7
+#define MG_MQTT_CMD_SUBSCRIBE 8
+#define MG_MQTT_CMD_SUBACK 9
+#define MG_MQTT_CMD_UNSUBSCRIBE 10
+#define MG_MQTT_CMD_UNSUBACK 11
+#define MG_MQTT_CMD_PINGREQ 12
+#define MG_MQTT_CMD_PINGRESP 13
+#define MG_MQTT_CMD_DISCONNECT 14
+
+/* MQTT event types */
+#define MG_MQTT_EVENT_BASE 200
+#define MG_EV_MQTT_CONNECT (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_CONNECT)
+#define MG_EV_MQTT_CONNACK (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_CONNACK)
+#define MG_EV_MQTT_PUBLISH (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_PUBLISH)
+#define MG_EV_MQTT_PUBACK (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_PUBACK)
+#define MG_EV_MQTT_PUBREC (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_PUBREC)
+#define MG_EV_MQTT_PUBREL (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_PUBREL)
+#define MG_EV_MQTT_PUBCOMP (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_PUBCOMP)
+#define MG_EV_MQTT_SUBSCRIBE (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_SUBSCRIBE)
+#define MG_EV_MQTT_SUBACK (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_SUBACK)
+#define MG_EV_MQTT_UNSUBSCRIBE (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_UNSUBSCRIBE)
+#define MG_EV_MQTT_UNSUBACK (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_UNSUBACK)
+#define MG_EV_MQTT_PINGREQ (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_PINGREQ)
+#define MG_EV_MQTT_PINGRESP (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_PINGRESP)
+#define MG_EV_MQTT_DISCONNECT (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_DISCONNECT)
+
+/* Message flags */
+#define MG_MQTT_RETAIN 0x1
+#define MG_MQTT_DUP 0x4
+#define MG_MQTT_QOS(qos) ((qos) << 1)
+#define MG_MQTT_GET_QOS(flags) (((flags) &0x6) >> 1)
+#define MG_MQTT_SET_QOS(flags, qos) (flags) = ((flags) & ~0x6) | ((qos) << 1)
+
+/* Connection flags */
+#define MG_MQTT_CLEAN_SESSION 0x02
+#define MG_MQTT_HAS_WILL 0x04
+#define MG_MQTT_WILL_RETAIN 0x20
+#define MG_MQTT_HAS_PASSWORD 0x40
+#define MG_MQTT_HAS_USER_NAME 0x80
+#define MG_MQTT_GET_WILL_QOS(flags) (((flags) &0x18) >> 3)
+#define MG_MQTT_SET_WILL_QOS(flags, qos) \
+  (flags) = ((flags) & ~0x18) | ((qos) << 3)
+
+/* CONNACK return codes */
+#define MG_EV_MQTT_CONNACK_ACCEPTED 0
+#define MG_EV_MQTT_CONNACK_UNACCEPTABLE_VERSION 1
+#define MG_EV_MQTT_CONNACK_IDENTIFIER_REJECTED 2
+#define MG_EV_MQTT_CONNACK_SERVER_UNAVAILABLE 3
+#define MG_EV_MQTT_CONNACK_BAD_AUTH 4
+#define MG_EV_MQTT_CONNACK_NOT_AUTHORIZED 5
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/*
+ * Attaches a built-in MQTT event handler to the given connection.
+ *
+ * The user-defined event handler will receive following extra events:
+ *
+ * - MG_EV_MQTT_CONNACK
+ * - MG_EV_MQTT_PUBLISH
+ * - MG_EV_MQTT_PUBACK
+ * - MG_EV_MQTT_PUBREC
+ * - MG_EV_MQTT_PUBREL
+ * - MG_EV_MQTT_PUBCOMP
+ * - MG_EV_MQTT_SUBACK
+ */
+void mg_set_protocol_mqtt(struct mg_connection *nc);
+
+/* Sends an MQTT handshake. */
+void mg_send_mqtt_handshake(struct mg_connection *nc, const char *client_id);
+
+/* Sends an MQTT handshake with optional parameters. */
+void mg_send_mqtt_handshake_opt(struct mg_connection *nc, const char *client_id,
+                                struct mg_send_mqtt_handshake_opts);
+
+/* Publishes a message to a given topic. */
+void mg_mqtt_publish(struct mg_connection *nc, const char *topic,
+                     uint16_t message_id, int flags, const void *data,
+                     size_t len);
+
+/* Subscribes to a bunch of topics. */
+void mg_mqtt_subscribe(struct mg_connection *nc,
+                       const struct mg_mqtt_topic_expression *topics,
+                       size_t topics_len, uint16_t message_id);
+
+/* Unsubscribes from a bunch of topics. */
+void mg_mqtt_unsubscribe(struct mg_connection *nc, char **topics,
+                         size_t topics_len, uint16_t message_id);
+
+/* Sends a DISCONNECT command. */
+void mg_mqtt_disconnect(struct mg_connection *nc);
+
+/* Sends a CONNACK command with a given `return_code`. */
+void mg_mqtt_connack(struct mg_connection *nc, uint8_t return_code);
+
+/* Sends a PUBACK command with a given `message_id`. */
+void mg_mqtt_puback(struct mg_connection *nc, uint16_t message_id);
+
+/* Sends a PUBREC command with a given `message_id`. */
+void mg_mqtt_pubrec(struct mg_connection *nc, uint16_t message_id);
+
+/* Sends a PUBREL command with a given `message_id`. */
+void mg_mqtt_pubrel(struct mg_connection *nc, uint16_t message_id);
+
+/* Sends a PUBCOMP command with a given `message_id`. */
+void mg_mqtt_pubcomp(struct mg_connection *nc, uint16_t message_id);
+
+/*
+ * Sends a SUBACK command with a given `message_id`
+ * and a sequence of granted QoSs.
+ */
+void mg_mqtt_suback(struct mg_connection *nc, uint8_t *qoss, size_t qoss_len,
+                    uint16_t message_id);
+
+/* Sends a UNSUBACK command with a given `message_id`. */
+void mg_mqtt_unsuback(struct mg_connection *nc, uint16_t message_id);
+
+/* Sends a PINGREQ command. */
+void mg_mqtt_ping(struct mg_connection *nc);
+
+/* Sends a PINGRESP command. */
+void mg_mqtt_pong(struct mg_connection *nc);
+
+/*
+ * Extracts the next topic expression from a SUBSCRIBE command payload.
+ *
+ * The topic expression name will point to a string in the payload buffer.
+ * Returns the pos of the next topic expression or -1 when the list
+ * of topics is exhausted.
+ */
+int mg_mqtt_next_subscribe_topic(struct mg_mqtt_message *msg,
+                                 struct mg_str *topic, uint8_t *qos, int pos);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* CS_MONGOOSE_SRC_MQTT_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/mqtt_server.h"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ * This software is dual-licensed: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation. For the terms of this
+ * license, see <http://www.gnu.org/licenses/>.
+ *
+ * You are free to use this software under the terms of the GNU General
+ * Public License, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * Alternatively, you can license this software under a commercial
+ * license, as set out in <https://www.cesanta.com/license>.
+ */
+
+/*
+ * === MQTT Server API reference
+ */
+
+#ifndef CS_MONGOOSE_SRC_MQTT_BROKER_H_
+#define CS_MONGOOSE_SRC_MQTT_BROKER_H_
+
+#if MG_ENABLE_MQTT_BROKER
+
+/* Amalgamated: #include "common/queue.h" */
+/* Amalgamated: #include "mongoose/src/mqtt.h" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#define MG_MQTT_MAX_SESSION_SUBSCRIPTIONS 512;
+
+struct mg_mqtt_broker;
+
+/* MQTT session (Broker side). */
+struct mg_mqtt_session {
+  struct mg_mqtt_broker *brk;       /* Broker */
+  LIST_ENTRY(mg_mqtt_session) link; /* mg_mqtt_broker::sessions linkage */
+  struct mg_connection *nc;         /* Connection with the client */
+  size_t num_subscriptions;         /* Size of `subscriptions` array */
+  void *user_data;                  /* User data */
+  struct mg_mqtt_topic_expression *subscriptions;
+};
+
+/* MQTT broker. */
+struct mg_mqtt_broker {
+  LIST_HEAD(_mg_sesshead, mg_mqtt_session) sessions; /* Session list */
+  void *user_data;                                   /* User data */
+};
+
+/* Initialises a MQTT broker. */
+void mg_mqtt_broker_init(struct mg_mqtt_broker *brk, void *user_data);
+
+/*
+ * Processes a MQTT broker message.
+ *
+ * The listening connection expects a pointer to an initialised
+ * `mg_mqtt_broker` structure in the `user_data` field.
+ *
+ * Basic usage:
+ *
+ * ```c
+ * mg_mqtt_broker_init(&brk, NULL);
+ *
+ * if ((nc = mg_bind(&mgr, address, mg_mqtt_broker)) == NULL) {
+ *   // fail;
+ * }
+ * nc->user_data = &brk;
+ * ```
+ *
+ * New incoming connections will receive a `mg_mqtt_session` structure
+ * in the connection `user_data`. The original `user_data` will be stored
+ * in the `user_data` field of the session structure. This allows the user
+ * handler to store user data before `mg_mqtt_broker` creates the session.
+ *
+ * Since only the MG_EV_ACCEPT message is processed by the listening socket,
+ * for most events the `user_data` will thus point to a `mg_mqtt_session`.
+ */
+void mg_mqtt_broker(struct mg_connection *brk, int ev, void *data);
+
+/*
+ * Iterates over all MQTT session connections. Example:
+ *
+ * ```c
+ * struct mg_mqtt_session *s;
+ * for (s = mg_mqtt_next(brk, NULL); s != NULL; s = mg_mqtt_next(brk, s)) {
+ *   // Do something
+ * }
+ * ```
+ */
+struct mg_mqtt_session *mg_mqtt_next(struct mg_mqtt_broker *brk,
+                                     struct mg_mqtt_session *s);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* MG_ENABLE_MQTT_BROKER */
+#endif /* CS_MONGOOSE_SRC_MQTT_BROKER_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/dns.h"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/*
+ * === DNS API reference
+ */
+
+#ifndef CS_MONGOOSE_SRC_DNS_H_
+#define CS_MONGOOSE_SRC_DNS_H_
+
+/* Amalgamated: #include "mongoose/src/net.h" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#define MG_DNS_A_RECORD 0x01     /* Lookup IP address */
+#define MG_DNS_CNAME_RECORD 0x05 /* Lookup CNAME */
+#define MG_DNS_PTR_RECORD 0x0c   /* Lookup PTR */
+#define MG_DNS_TXT_RECORD 0x10   /* Lookup TXT */
+#define MG_DNS_AAAA_RECORD 0x1c  /* Lookup IPv6 address */
+#define MG_DNS_SRV_RECORD 0x21   /* Lookup SRV */
+#define MG_DNS_MX_RECORD 0x0f    /* Lookup mail server for domain */
+
+#define MG_MAX_DNS_QUESTIONS 32
+#define MG_MAX_DNS_ANSWERS 32
+
+#define MG_DNS_MESSAGE 100 /* High-level DNS message event */
+
+enum mg_dns_resource_record_kind {
+  MG_DNS_INVALID_RECORD = 0,
+  MG_DNS_QUESTION,
+  MG_DNS_ANSWER
+};
+
+/* DNS resource record. */
+struct mg_dns_resource_record {
+  struct mg_str name; /* buffer with compressed name */
+  int rtype;
+  int rclass;
+  int ttl;
+  enum mg_dns_resource_record_kind kind;
+  struct mg_str rdata; /* protocol data (can be a compressed name) */
+};
+
+/* DNS message (request and response). */
+struct mg_dns_message {
+  struct mg_str pkt; /* packet body */
+  uint16_t flags;
+  uint16_t transaction_id;
+  int num_questions;
+  int num_answers;
+  struct mg_dns_resource_record questions[MG_MAX_DNS_QUESTIONS];
+  struct mg_dns_resource_record answers[MG_MAX_DNS_ANSWERS];
+};
+
+struct mg_dns_resource_record *mg_dns_next_record(
+    struct mg_dns_message *msg, int query, struct mg_dns_resource_record *prev);
+
+/*
+ * Parses the record data from a DNS resource record.
+ *
+ *  - A:     struct in_addr *ina
+ *  - AAAA:  struct in6_addr *ina
+ *  - CNAME: char buffer
+ *
+ * Returns -1 on error.
+ *
+ * TODO(mkm): MX
+ */
+int mg_dns_parse_record_data(struct mg_dns_message *msg,
+                             struct mg_dns_resource_record *rr, void *data,
+                             size_t data_len);
+
+/*
+ * Sends a DNS query to the remote end.
+ */
+void mg_send_dns_query(struct mg_connection *nc, const char *name,
+                       int query_type);
+
+/*
+ * Inserts a DNS header to an IO buffer.
+ *
+ * Returns the number of bytes inserted.
+ */
+int mg_dns_insert_header(struct mbuf *io, size_t pos,
+                         struct mg_dns_message *msg);
+
+/*
+ * Appends already encoded questions from an existing message.
+ *
+ * This is useful when generating a DNS reply message which includes
+ * all question records.
+ *
+ * Returns the number of appended bytes.
+ */
+int mg_dns_copy_questions(struct mbuf *io, struct mg_dns_message *msg);
+
+/*
+ * Encodes and appends a DNS resource record to an IO buffer.
+ *
+ * The record metadata is taken from the `rr` parameter, while the name and data
+ * are taken from the parameters, encoded in the appropriate format depending on
+ * record type and stored in the IO buffer. The encoded values might contain
+ * offsets within the IO buffer. It's thus important that the IO buffer doesn't
+ * get trimmed while a sequence of records are encoded while preparing a DNS
+ * reply.
+ *
+ * This function doesn't update the `name` and `rdata` pointers in the `rr`
+ * struct because they might be invalidated as soon as the IO buffer grows
+ * again.
+ *
+ * Returns the number of bytes appened or -1 in case of error.
+ */
+int mg_dns_encode_record(struct mbuf *io, struct mg_dns_resource_record *rr,
+                         const char *name, size_t nlen, const void *rdata,
+                         size_t rlen);
+
+/*
+ * Encodes a DNS name.
+ */
+int mg_dns_encode_name(struct mbuf *io, const char *name, size_t len);
+
+/* Low-level: parses a DNS response. */
+int mg_parse_dns(const char *buf, int len, struct mg_dns_message *msg);
+
+/*
+ * Uncompresses a DNS compressed name.
+ *
+ * The containing DNS message is required because of the compressed encoding
+ * and reference suffixes present elsewhere in the packet.
+ *
+ * If the name is less than `dst_len` characters long, the remainder
+ * of `dst` is terminated with `\0` characters. Otherwise, `dst` is not
+ * terminated.
+ *
+ * If `dst_len` is 0 `dst` can be NULL.
+ * Returns the uncompressed name length.
+ */
+size_t mg_dns_uncompress_name(struct mg_dns_message *msg, struct mg_str *name,
+                              char *dst, int dst_len);
+
+/*
+ * Attaches a built-in DNS event handler to the given listening connection.
+ *
+ * The DNS event handler parses the incoming UDP packets, treating them as DNS
+ * requests. If an incoming packet gets successfully parsed by the DNS event
+ * handler, a user event handler will receive an `MG_DNS_REQUEST` event, with
+ * `ev_data` pointing to the parsed `struct mg_dns_message`.
+ *
+ * See
+ * [captive_dns_server](https://github.com/cesanta/mongoose/tree/master/examples/captive_dns_server)
+ * example on how to handle DNS request and send DNS reply.
+ */
+void mg_set_protocol_dns(struct mg_connection *nc);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* CS_MONGOOSE_SRC_DNS_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/dns_server.h"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/*
+ * === DNS server API reference
+ *
+ * Disabled by default; enable with `-DMG_ENABLE_DNS_SERVER`.
+ */
+
+#ifndef CS_MONGOOSE_SRC_DNS_SERVER_H_
+#define CS_MONGOOSE_SRC_DNS_SERVER_H_
+
+#if MG_ENABLE_DNS_SERVER
+
+/* Amalgamated: #include "mongoose/src/dns.h" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#define MG_DNS_SERVER_DEFAULT_TTL 3600
+
+struct mg_dns_reply {
+  struct mg_dns_message *msg;
+  struct mbuf *io;
+  size_t start;
+};
+
+/*
+ * Creates a DNS reply.
+ *
+ * The reply will be based on an existing query message `msg`.
+ * The query body will be appended to the output buffer.
+ * "reply + recursion allowed" will be added to the message flags and the
+ * message's num_answers will be set to 0.
+ *
+ * Answer records can be appended with `mg_dns_send_reply` or by lower
+ * level function defined in the DNS API.
+ *
+ * In order to send a reply use `mg_dns_send_reply`.
+ * It's possible to use a connection's send buffer as reply buffer,
+ * and it will work for both UDP and TCP connections.
+ *
+ * Example:
+ *
+ * ```c
+ * reply = mg_dns_create_reply(&nc->send_mbuf, msg);
+ * for (i = 0; i < msg->num_questions; i++) {
+ *   rr = &msg->questions[i];
+ *   if (rr->rtype == MG_DNS_A_RECORD) {
+ *     mg_dns_reply_record(&reply, rr, 3600, &dummy_ip_addr, 4);
+ *   }
+ * }
+ * mg_dns_send_reply(nc, &reply);
+ * ```
+ */
+struct mg_dns_reply mg_dns_create_reply(struct mbuf *io,
+                                        struct mg_dns_message *msg);
+
+/*
+ * Appends a DNS reply record to the IO buffer and to the DNS message.
+ *
+ * The message's num_answers field will be incremented. It's the caller's duty
+ * to ensure num_answers is properly initialised.
+ *
+ * Returns -1 on error.
+ */
+int mg_dns_reply_record(struct mg_dns_reply *reply,
+                        struct mg_dns_resource_record *question,
+                        const char *name, int rtype, int ttl, const void *rdata,
+                        size_t rdata_len);
+
+/*
+ * Sends a DNS reply through a connection.
+ *
+ * The DNS data is stored in an IO buffer pointed by reply structure in `r`.
+ * This function mutates the content of that buffer in order to ensure that
+ * the DNS header reflects the size and flags of the message, that might have
+ * been updated either with `mg_dns_reply_record` or by direct manipulation of
+ * `r->message`.
+ *
+ * Once sent, the IO buffer will be trimmed unless the reply IO buffer
+ * is the connection's send buffer and the connection is not in UDP mode.
+ */
+void mg_dns_send_reply(struct mg_connection *nc, struct mg_dns_reply *r);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* MG_ENABLE_DNS_SERVER */
+#endif /* CS_MONGOOSE_SRC_DNS_SERVER_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/resolv.h"
+#endif
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/*
+ * === API reference
+ */
+
+#ifndef CS_MONGOOSE_SRC_RESOLV_H_
+#define CS_MONGOOSE_SRC_RESOLV_H_
+
+/* Amalgamated: #include "mongoose/src/dns.h" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+enum mg_resolve_err {
+  MG_RESOLVE_OK = 0,
+  MG_RESOLVE_NO_ANSWERS = 1,
+  MG_RESOLVE_EXCEEDED_RETRY_COUNT = 2,
+  MG_RESOLVE_TIMEOUT = 3
+};
+
+typedef void (*mg_resolve_callback_t)(struct mg_dns_message *dns_message,
+                                      void *user_data, enum mg_resolve_err);
+
+/* Options for `mg_resolve_async_opt`. */
+struct mg_resolve_async_opts {
+  const char *nameserver_url;
+  int max_retries;    /* defaults to 2 if zero */
+  int timeout;        /* in seconds; defaults to 5 if zero */
+  int accept_literal; /* pseudo-resolve literal ipv4 and ipv6 addrs */
+  int only_literal;   /* only resolves literal addrs; sync cb invocation */
+  struct mg_connection **dns_conn; /* return DNS connection */
+};
+
+/* See `mg_resolve_async_opt()` */
+int mg_resolve_async(struct mg_mgr *mgr, const char *name, int query,
+                     mg_resolve_callback_t cb, void *data);
+
+/*
+ * Resolved a DNS name asynchronously.
+ *
+ * Upon successful resolution, the user callback will be invoked
+ * with the full DNS response message and a pointer to the user's
+ * context `data`.
+ *
+ * In case of timeout while performing the resolution the callback
+ * will receive a NULL `msg`.
+ *
+ * The DNS answers can be extracted with `mg_next_record` and
+ * `mg_dns_parse_record_data`:
+ *
+ * [source,c]
+ * ----
+ * struct in_addr ina;
+ * struct mg_dns_resource_record *rr = mg_next_record(msg, MG_DNS_A_RECORD,
+ *   NULL);
+ * mg_dns_parse_record_data(msg, rr, &ina, sizeof(ina));
+ * ----
+ */
+int mg_resolve_async_opt(struct mg_mgr *mgr, const char *name, int query,
+                         mg_resolve_callback_t cb, void *data,
+                         struct mg_resolve_async_opts opts);
+
+/*
+ * Resolve a name from `/etc/hosts`.
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int mg_resolve_from_hosts_file(const char *host, union socket_address *usa);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* CS_MONGOOSE_SRC_RESOLV_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/coap.h"
+#endif
+/*
+ * Copyright (c) 2015 Cesanta Software Limited
+ * All rights reserved
+ * This software is dual-licensed: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation. For the terms of this
+ * license, see <http://www.gnu.org/licenses/>.
+ *
+ * You are free to use this software under the terms of the GNU General
+ * Public License, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * Alternatively, you can license this software under a commercial
+ * license, as set out in <https://www.cesanta.com/license>.
+ */
+
+/*
+ * === CoAP API reference
+ *
+ * CoAP message format:
+ *
+ * ```
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
+ * |Ver| T | TKL | Code | Message ID | Token (if any, TKL bytes) ...
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
+ * | Options (if any) ...            |1 1 1 1 1 1 1 1| Payload (if any) ...
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
+ * ```
+ */
+
+#ifndef CS_MONGOOSE_SRC_COAP_H_
+#define CS_MONGOOSE_SRC_COAP_H_
+
+#if MG_ENABLE_COAP
+
+#define MG_COAP_MSG_TYPE_FIELD 0x2
+#define MG_COAP_CODE_CLASS_FIELD 0x4
+#define MG_COAP_CODE_DETAIL_FIELD 0x8
+#define MG_COAP_MSG_ID_FIELD 0x10
+#define MG_COAP_TOKEN_FIELD 0x20
+#define MG_COAP_OPTIOMG_FIELD 0x40
+#define MG_COAP_PAYLOAD_FIELD 0x80
+
+#define MG_COAP_ERROR 0x10000
+#define MG_COAP_FORMAT_ERROR (MG_COAP_ERROR | 0x20000)
+#define MG_COAP_IGNORE (MG_COAP_ERROR | 0x40000)
+#define MG_COAP_NOT_ENOUGH_DATA (MG_COAP_ERROR | 0x80000)
+#define MG_COAP_NETWORK_ERROR (MG_COAP_ERROR | 0x100000)
+
+#define MG_COAP_MSG_CON 0
+#define MG_COAP_MSG_NOC 1
+#define MG_COAP_MSG_ACK 2
+#define MG_COAP_MSG_RST 3
+#define MG_COAP_MSG_MAX 3
+
+#define MG_COAP_CODECLASS_REQUEST 0
+#define MG_COAP_CODECLASS_RESP_OK 2
+#define MG_COAP_CODECLASS_CLIENT_ERR 4
+#define MG_COAP_CODECLASS_SRV_ERR 5
+
+#define MG_COAP_EVENT_BASE 300
+#define MG_EV_COAP_CON (MG_COAP_EVENT_BASE + MG_COAP_MSG_CON)
+#define MG_EV_COAP_NOC (MG_COAP_EVENT_BASE + MG_COAP_MSG_NOC)
+#define MG_EV_COAP_ACK (MG_COAP_EVENT_BASE + MG_COAP_MSG_ACK)
+#define MG_EV_COAP_RST (MG_COAP_EVENT_BASE + MG_COAP_MSG_RST)
+
+/*
+ * CoAP options.
+ * Use mg_coap_add_option and mg_coap_free_options
+ * for creation and destruction.
+ */
+struct mg_coap_option {
+  struct mg_coap_option *next;
+  uint32_t number;
+  struct mg_str value;
+};
+
+/* CoAP message. See RFC 7252 for details. */
+struct mg_coap_message {
+  uint32_t flags;
+  uint8_t msg_type;
+  uint8_t code_class;
+  uint8_t code_detail;
+  uint16_t msg_id;
+  struct mg_str token;
+  struct mg_coap_option *options;
+  struct mg_str payload;
+  struct mg_coap_option *optiomg_tail;
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* Sets CoAP protocol handler - triggers CoAP specific events. */
+int mg_set_protocol_coap(struct mg_connection *nc);
+
+/*
+ * Adds a new option to mg_coap_message structure.
+ * Returns pointer to the newly created option.
+ * Note: options must be freed by using mg_coap_free_options
+ */
+struct mg_coap_option *mg_coap_add_option(struct mg_coap_message *cm,
+                                          uint32_t number, char *value,
+                                          size_t len);
+
+/*
+ * Frees the memory allocated for options.
+ * If the cm paramater doesn't contain any option it does nothing.
+ */
+void mg_coap_free_options(struct mg_coap_message *cm);
+
+/*
+ * Composes a CoAP message from `mg_coap_message`
+ * and sends it into `nc` connection.
+ * Returns 0 on success. On error, it is a bitmask:
+ *
+ * - `#define MG_COAP_ERROR 0x10000`
+ * - `#define MG_COAP_FORMAT_ERROR (MG_COAP_ERROR | 0x20000)`
+ * - `#define MG_COAP_IGNORE (MG_COAP_ERROR | 0x40000)`
+ * - `#define MG_COAP_NOT_ENOUGH_DATA (MG_COAP_ERROR | 0x80000)`
+ * - `#define MG_COAP_NETWORK_ERROR (MG_COAP_ERROR | 0x100000)`
+ */
+uint32_t mg_coap_send_message(struct mg_connection *nc,
+                              struct mg_coap_message *cm);
+
+/*
+ * Composes CoAP acknowledgement from `mg_coap_message`
+ * and sends it into `nc` connection.
+ * Return value: see `mg_coap_send_message()`
+ */
+uint32_t mg_coap_send_ack(struct mg_connection *nc, uint16_t msg_id);
+
+/*
+ * Parses CoAP message and fills mg_coap_message and returns cm->flags.
+ * This is a helper function.
+ *
+ * NOTE: usually CoAP works over UDP, so lack of data means format error.
+ * But, in theory, it is possible to use CoAP over TCP (according to RFC)
+ *
+ * The caller has to check results and treat COAP_NOT_ENOUGH_DATA according to
+ * underlying protocol:
+ *
+ * - in case of UDP COAP_NOT_ENOUGH_DATA means COAP_FORMAT_ERROR,
+ * - in case of TCP client can try to receive more data
+ *
+ * Return value: see `mg_coap_send_message()`
+ */
+uint32_t mg_coap_parse(struct mbuf *io, struct mg_coap_message *cm);
+
+/*
+ * Composes CoAP message from mg_coap_message structure.
+ * This is a helper function.
+ * Return value: see `mg_coap_send_message()`
+ */
+uint32_t mg_coap_compose(struct mg_coap_message *cm, struct mbuf *io);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* MG_ENABLE_COAP */
+
+#endif /* CS_MONGOOSE_SRC_COAP_H_ */
+#ifdef MG_MODULE_LINES
+#line 1 "mongoose/src/sntp.h"
+#endif
+/*
+ * Copyright (c) 2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_MONGOOSE_SRC_SNTP_H_
+#define CS_MONGOOSE_SRC_SNTP_H_
+
+#if MG_ENABLE_SNTP
+
+#define MG_SNTP_EVENT_BASE 500
+
+/*
+ * Received reply from time server. Event handler parameter contains
+ * pointer to mg_sntp_message structure
+ */
+#define MG_SNTP_REPLY (MG_SNTP_EVENT_BASE + 1)
+
+/* Received malformed SNTP packet */
+#define MG_SNTP_MALFORMED_REPLY (MG_SNTP_EVENT_BASE + 2)
+
+/* Failed to get time from server (timeout etc) */
+#define MG_SNTP_FAILED (MG_SNTP_EVENT_BASE + 3)
+
+struct mg_sntp_message {
+  /* if server sends this flags, user should not send requests to it */
+  int kiss_of_death;
+  /* usual mg_time */
+  double time;
+};
+
+/* Establishes connection to given sntp server */
+struct mg_connection *mg_sntp_connect(struct mg_mgr *mgr,
+                                      mg_event_handler_t event_handler,
+                                      const char *sntp_server_name);
+
+/* Sends time request to given connection */
+void mg_sntp_send_request(struct mg_connection *c);
+
+/*
+ * Helper function
+ * Establishes connection to time server, tries to send request
+ * repeats sending SNTP_ATTEMPTS times every SNTP_TIMEOUT sec
+ * (if needed)
+ * See sntp_client example
+ */
+struct mg_connection *mg_sntp_get_time(struct mg_mgr *mgr,
+                                       mg_event_handler_t event_handler,
+                                       const char *sntp_server_name);
+
+#endif
+
+#endif /* CS_MONGOOSE_SRC_SNTP_H_ */