#!/usr/local/bin/php -f
<?php
/*
	rc.newwanip
	Copyright (C) 2006 Scott Ullrich (sullrich@gmail.com)
	part of pfSense (https://www.pfsense.org)

	Originally part of m0n0wall (http://m0n0.ch)
	Copyright (C) 2003-2005 Manuel Kasper <mk@neon1.net>.
	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.

	THIS SOFTWARE IS PROVIDED ``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
	AUTHOR 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.
*/

/* 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");

// Do not process while booting
if (platform_booting())
	return;

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

	/* restart packages */
	system_ntp_configure(false);
	mwexec_bg("/usr/local/sbin/ntpdate_sync_once.sh", true);
	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)) {
	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 if DNS overrides are allowed */
system_resolvconf_generate(true);

/* write current WAN 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 tunneled 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":
		if (isset($config['interfaces'][$interface]['dhcp6usev4iface']))
			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);
		}
	}
}

/*
 * 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.");
		mwexec_bg("/sbin/pfctl -k $oldip");
		if (isset($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();
		}
	}
	
	/* reconfigure static routes (kernel may have deleted them) */
	system_routing_configure($interface);

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

	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();
}

/* signal filter reload */
filter_configure();

?>