#!/usr/local/bin/php-cgi -f
<?php
/*
 * rc.newwanip
 *
 * part of pfSense (https://www.pfsense.org)
 * Copyright (c) 2006-2016 Electric Sheep Fencing, LLC
 * All rights reserved.
 *
 * Originally part of m0n0wall (http://m0n0.ch/wall)
 * Copyright (c) 2003-2005 Manuel Kasper <mk@neon1.net>.
 * All rights reserved.
 *
 * 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.
 */

/* parse the configuration and include all functions used below */
require_once("globals.inc");
require_once("config.inc");
require_once("functions.inc");
require_once("filter.inc");
require_once("shaper.inc");
require_once("ipsec.inc");
require_once("vpn.inc");
require_once("openvpn.inc");
require_once("IPv6.inc");
require_once("rrd.inc");

function restart_packages() {
	global $oldip, $curwanip, $g;

	/* restart packages */
	log_error("{$g['product_name']} package system has detected an IP change or dynamic WAN reconnection - $oldip ->  $curwanip - Restarting packages.");
	send_event("service reload packages");
}

/* Interface IP address has changed */
if (isset($_GET['interface'])) {
	$argument = $_GET['interface'];
} else {
	$argument = str_replace("\n", "", $argv[1]);
}

log_error("rc.newwanip: Info: starting on {$argument}.");

if (empty($argument)) {
	$interface = "wan";
	$interface_real = get_real_interface();
} else {
	$interface = convert_real_interface_to_friendly_interface_name($argument);
	$interface_real = $argument;
}

$interface_descr = convert_friendly_interface_to_friendly_descr($interface);

/* If the interface is configured and not enabled, bail. We do not need to change settings for disabled interfaces. #3313 */
if (is_array($config['interfaces'][$interface]) && !isset($config['interfaces'][$interface]['enable'])) {
	log_error("Interface is disabled, nothing to do.");
	return;
}

if (empty($argument)) {
	$curwanip = get_interface_ip();
} else {
	$curwanip = find_interface_ip($interface_real, true);
	if ($curwanip == "") {
		$curwanip = get_interface_ip($interface);
	}
}

log_error("rc.newwanip: on (IP address: {$curwanip}) (interface: {$interface_descr}[{$interface}]) (real interface: {$interface_real}).");

/*
 * NOTE: Take care of openvpn, no-ip or similar interfaces if you generate the event to reconfigure an interface.
 *      i.e. OpenVPN might be in tap mode and not have an ip.
 */
if ($curwanip == "0.0.0.0" || !is_ipaddr($curwanip)) {
	if (substr($interface_real, 0, 4) != "ovpn") {
		if (!empty($config['interfaces'][$interface]['ipaddr'])) {
			log_error("rc.newwanip: Failed to update {$interface} IP, restarting...");
			send_event("interface reconfigure {$interface}");
			return;
		}
	}
}

/* XXX: This really possible? */
if (empty($interface)) {
	if (platform_booting()) {
		return;
	}
	log_error("rc.newwanip called with empty interface.");
	filter_configure();
	restart_packages();
	return;
}

$oldip = "0.0.0.0";
if (file_exists("{$g['vardb_path']}/{$interface}_cacheip")) {
	$oldip = file_get_contents("{$g['vardb_path']}/{$interface}_cacheip");
}

/* regenerate resolv.conf */
system_resolvconf_generate(true);

/* write the current interface IP to file */
if (is_ipaddr($curwanip)) {
	@file_put_contents("{$g['vardb_path']}/{$interface}_ip", $curwanip);
}

link_interface_to_vips($interface, "update");

unset($gre);
$gre = link_interface_to_gre($interface);
if (!empty($gre)) {
	array_walk($gre, 'interface_gre_configure');
}

unset($gif);
$gif = link_interface_to_gif($interface);
if (!empty($gif)) {
	array_walk($gif, 'interface_gif_configure');
}

$grouptmp = link_interface_to_group($interface);
if (!empty($grouptmp)) {
	array_walk($grouptmp, 'interface_group_add_member');
}

unset($bridgetmp);
$bridgetmp = link_interface_to_bridge($interface);
if (!empty($bridgetmp)) {
	interface_bridge_add_member($bridgetmp, $interface_real);
}

/* make new hosts file */
system_hosts_generate();

/* check tunnelled IPv6 interface tracking */
switch ($config['interfaces'][$interface]['ipaddrv6']) {
	case "6to4":
		interface_6to4_configure($interface, $config['interfaces'][$interface]);
		break;
	case "6rd":
		interface_6rd_configure($interface, $config['interfaces'][$interface]);
		break;
	case "dhcp6":
		// N.B. PPP connections using PPP as the IPv6 parent interface are excluded because the ppp-ipv6 script calls
		// interface_dhcpv6_configure() for these connections after IPv6CP is up
		if (isset($config['interfaces'][$interface]['dhcp6usev4iface']) && !interface_isppp_type($interface)) {
			interface_dhcpv6_configure($interface, $config['interfaces'][$interface]);
		}
		break;
}

/* Check Gif tunnels */
if (!empty($gif)) {
	foreach ($gif as $giftun) {
		$confif = convert_real_interface_to_friendly_interface_name($giftun['gifif']);
		if (!empty($confif)) {
			interface_configure($confif);
			system_routing_configure($confif);
		}
	}
}
if (!empty($gre)) {
	foreach ($gre as $gretun) {
		$confif = convert_real_interface_to_friendly_interface_name($gretun['greif']);
		if (!empty($confif)) {
			interface_configure($confif);
			system_routing_configure($confif);
		}
	}
}

if (platform_booting()) {
	// avoid race conditions in many of the below functions that occur during boot
	// setting up gateways monitor doesn't seem to have issues here, and fixes the
	// most commonly encountered bugs from earlier versions when everything below
	// was skipped during boot
	setup_gateways_monitor();
	exit;
}

/*
 * We need to force sync VPNs on such even when the IP is the same for dynamic interfaces.
 * Even with the same IP the VPN software is unhappy with the IP disappearing, and we
 * could be failing back in which case we need to switch IPs back anyhow.
 */
if (!is_ipaddr($oldip) || $curwanip != $oldip || !is_ipaddrv4($config['interfaces'][$interface]['ipaddr'])) {
	/* IP changed, kill states accordingly */
	if ($curwanip != $oldip) {
		log_error("IP has changed, killing states on former IP $oldip.");
		pfSense_kill_states($oldip);
		if (isset($config['system']['ip_change_kill_states'])) {
			/* hidden config option to wipe all states if needed */
			log_error("Killing all states post-IP change.");
			filter_flush_state_table();
		}
	}

	/*
	 * Some services (e.g. dyndns, see ticket #4066) depend on
	 * filter_configure() to be called before, otherwise pass out
	 * route-to rules have the old ip set in 'from' and connections
	 * do not go through the correct link
	 */
	filter_configure_sync();

	/* reconfigure static routes (kernel may have deleted them) */
	system_routing_configure($interface);

	/* reconfigure our gateway monitor */
	setup_gateways_monitor();

	/* reload unbound */
	services_unbound_configure();

	if (is_ipaddr($curwanip)) {
		@file_put_contents("{$g['vardb_path']}/{$interface}_cacheip", $curwanip);
	}

	/* perform RFC 2136 DNS update */
	services_dnsupdate_process($interface);

	/* signal dyndns update */
	services_dyndns_configure($interface);

	/* reconfigure IPsec tunnels */
	vpn_ipsec_force_reload($interface);

	/* start OpenVPN server & clients */
	if (substr($interface_real, 0, 4) != "ovpn") {
		openvpn_resync_all($interface);
	}

	/* reload graphing functions */
	enable_rrd_graphing();

	/* reload igmpproxy */
	services_igmpproxy_configure();

	/* restart snmp */
	services_snmpd_configure();

	restart_packages();
} else {
	/* signal filter reload */
	filter_configure();
}

?>