/* Networking DHCPv4 client */

/*
 * Copyright (c) 2017 ARM Ltd.
 * Copyright (c) 2016 Intel Corporation.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(net_dhcpv4_client_sample, LOG_LEVEL_DBG);

#include <zephyr/kernel.h>
#include <zephyr/linker/sections.h>
#include <errno.h>
#include <stdio.h>

#include <zephyr/net/net_if.h>
#include <zephyr/net/net_core.h>
#include <zephyr/net/net_context.h>
#include <zephyr/net/net_mgmt.h>

#define DHCP_OPTION_NTP (42)

static uint8_t ntp_server[4];

static struct net_mgmt_event_callback mgmt_cb;

static struct net_dhcpv4_option_callback dhcp_cb;

static void handler(struct net_mgmt_event_callback *cb,
		    uint32_t mgmt_event,
		    struct net_if *iface)
{
	int i = 0;

	if (mgmt_event != NET_EVENT_IPV4_ADDR_ADD) {
		return;
	}

	for (i = 0; i < NET_IF_MAX_IPV4_ADDR; i++) {
		char buf[NET_IPV4_ADDR_LEN];

		if (iface->config.ip.ipv4->unicast[i].addr_type !=
							NET_ADDR_DHCP) {
			continue;
		}

		LOG_INF("Your address: %s",
			net_addr_ntop(AF_INET,
			    &iface->config.ip.ipv4->unicast[i].address.in_addr,
						  buf, sizeof(buf)));
		LOG_INF("Lease time: %u seconds",
			 iface->config.dhcpv4.lease_time);
		LOG_INF("Subnet: %s",
			net_addr_ntop(AF_INET,
				       &iface->config.ip.ipv4->netmask,
				       buf, sizeof(buf)));
		LOG_INF("Router: %s",
			net_addr_ntop(AF_INET,
						 &iface->config.ip.ipv4->gw,
						 buf, sizeof(buf)));
	}
}

static void option_handler(struct net_dhcpv4_option_callback *cb,
			   size_t length,
			   enum net_dhcpv4_msg_type msg_type,
			   struct net_if *iface)
{
	char buf[NET_IPV4_ADDR_LEN];

	LOG_INF("DHCP Option %d: %s", cb->option,
		net_addr_ntop(AF_INET, cb->data, buf, sizeof(buf)));
}

int main(void)
{
	struct net_if *iface;

	LOG_INF("Run dhcpv4 client");

	net_mgmt_init_event_callback(&mgmt_cb, handler,
				     NET_EVENT_IPV4_ADDR_ADD);
	net_mgmt_add_event_callback(&mgmt_cb);

	iface = net_if_get_default();

	net_dhcpv4_init_option_callback(&dhcp_cb, option_handler,
					DHCP_OPTION_NTP, ntp_server,
					sizeof(ntp_server));

	net_dhcpv4_add_option_callback(&dhcp_cb);

	net_dhcpv4_start(iface);
	return 0;
}