esp-idf/components/lwip/include/apps/dhcpserver/dhcpserver.h

// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at

//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef __DHCPS_H__
#define __DHCPS_H__

#include "sdkconfig.h"
#include "lwip/ip_addr.h"

typedef struct dhcps_state{
        s16_t state;
} dhcps_state;

typedef struct dhcps_msg {
        u8_t op, htype, hlen, hops;
        u8_t xid[4];
        u16_t secs, flags;
        u8_t ciaddr[4];
        u8_t yiaddr[4];
        u8_t siaddr[4];
        u8_t giaddr[4];
        u8_t chaddr[16];
        u8_t sname[64];
        u8_t file[128];
        u8_t options[312];
}dhcps_msg;

/*   Defined in esp_misc.h */
typedef struct {
	bool enable;
	ip4_addr_t start_ip;
	ip4_addr_t end_ip;
} dhcps_lease_t;

enum dhcps_offer_option{
	OFFER_START = 0x00,
	OFFER_ROUTER = 0x01,
	OFFER_DNS = 0x02,
	OFFER_END
};

#define DHCPS_COARSE_TIMER_SECS  1
#define DHCPS_MAX_LEASE 0x64
#define DHCPS_LEASE_TIME_DEF (120)
#define DHCPS_LEASE_UNIT CONFIG_LWIP_DHCPS_LEASE_UNIT

struct dhcps_pool{
	ip4_addr_t ip;
	u8_t mac[6];
	u32_t lease_timer;
};

typedef u32_t dhcps_time_t;
typedef u8_t dhcps_offer_t;

typedef struct {
        dhcps_offer_t dhcps_offer;
        dhcps_offer_t dhcps_dns;
        dhcps_time_t  dhcps_time;
        dhcps_lease_t dhcps_poll;
} dhcps_options_t;

typedef void (*dhcps_cb_t)(u8_t client_ip[4]);

static inline bool dhcps_router_enabled (dhcps_offer_t offer) 
{
    return (offer & OFFER_ROUTER) != 0;
}

static inline bool dhcps_dns_enabled (dhcps_offer_t offer) 
{
    return (offer & OFFER_DNS) != 0;
}

void dhcps_start(struct netif *netif, ip4_addr_t ip);
void dhcps_stop(struct netif *netif);
void *dhcps_option_info(u8_t op_id, u32_t opt_len);
void dhcps_set_option_info(u8_t op_id, void *opt_info, u32_t opt_len);
bool dhcp_search_ip_on_mac(u8_t *mac, ip4_addr_t *ip);
void dhcps_dns_setserver(const ip_addr_t *dnsserver);
ip4_addr_t dhcps_dns_getserver();
void dhcps_set_new_lease_cb(dhcps_cb_t cb);

#endif