#!/usr/local/bin/php-cgi -f
<?php
/*
 * rc.openvpn
 *
 * part of pfSense (https://www.pfsense.org)
 * Copyright (c) 2009 Seth Mos <seth.mos@dds.nl>.
 * Copyright (c) 2007-2016 Rubicon Communications, LLC (Netgate)
 * All rights reserved.
 *
 * Originally part of m0n0wall (http://m0n0.ch/wall)
 * Copyright (c) 2007 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.
 *
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgment:
 *    "This product includes software developed by the pfSense Project
 *    for use in the pfSense® software distribution. (http://www.pfsense.org/).
 *
 * 4. The names "pfSense" and "pfSense Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    coreteam@pfsense.org.
 *
 * 5. Products derived from this software may not be called "pfSense"
 *    nor may "pfSense" appear in their names without prior written
 *    permission of the Electric Sheep Fencing, LLC.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *
 * "This product includes software developed by the pfSense Project
 * for use in the pfSense software distribution (http://www.pfsense.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY THE pfSense PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 pfSense PROJECT OR
 * ITS 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.
 */

/* parse the configuration and include all functions used below */
require_once("util.inc");
require_once("config.inc");
require_once("functions.inc");
require_once("filter.inc");
require_once("gwlb.inc");
require_once("openvpn.inc");

function openvpn_resync_if_needed ($mode, $ovpn_settings, $interface) {
	global $g, $config;

	$resync_needed = true;
	if (isset($ovpn_settings['disable'])) {
		$resync_needed = false;
	} else {
		if (!empty($interface)) {
			$mode_id = $mode . $ovpn_settings['vpnid'];
			$fpath = "{$g['varetc_path']}/openvpn/{$mode_id}.interface";
			if (file_exists($fpath)) {
				/* Compare the interface currently used by the VPN with the interface that should be used.
				   If the VPN should stay on the same interface, do not resync */
				if (trim(file_get_contents($fpath), " \t\n") == get_failover_interface($ovpn_settings['interface'])) {
					$resync_needed = false;
				}
			}
		}
	}
	if ($resync_needed == true) {
		log_error("OpenVPN: Resync " . $mode_id . " " . $ovpn_settings['description']);
		openvpn_resync($mode, $ovpn_settings);
	}
}

/* make sure to wait until the boot scripts have finished */
if (file_exists("{$g['varrun_path']}/booting")) {
	return;
}

/* Input argument is a comma-separated list of gateway names, blank or "all". */
if (isset($_GET['interface'])) {
	$argument = $_GET['interface'];
} else {
	$argument = trim($argv[1], " \n");
}

if ((is_array($config['openvpn']['openvpn-server']) && count($config['openvpn']['openvpn-server'])) ||
    (is_array($config['openvpn']['openvpn-client']) && count($config['openvpn']['openvpn-client']))) {
	if (empty($argument) || $argument == "all") {
		$argument = "all";
		$log_text = "all";
	} else {
		$log_text = "endpoints that may use " . $argument;
	}
	log_error("OpenVPN: One or more OpenVPN tunnel endpoints may have changed its IP. Reloading " . $log_text . ".");
} else {
	return;
}

$openvpnlck = try_lock('openvpn', 10);
if (!$openvpnlck) {
	log_error(gettext("Could not obtain openvpn lock for executing rc.openvpn for more than 10 seconds continuing..."));
	unlock_force('openvpn');
	$openvpnlck = lock('openvpn', LOCK_EX);
}

$arg_array = explode(",", $argument);
foreach ($arg_array as $arg_element) {
	$gwgroups = array();
	if ($arg_element == "all") {
		$interface = "";
	} else {
		// e.g. $arg_element = "WANGW", $interface = "wan"
		$interface = lookup_gateway_interface_by_name($arg_element);
		if (empty($interface)) {
			$interface = $arg_element;
		} else {
			// e.g. $arg_element = "WANGW", $gwgroups = array of gateway groups that use "wan"
			$gwgroups = gateway_is_gwgroup_member($arg_element);
		}
	}

	if (is_array($config['openvpn']['openvpn-server'])) {
		foreach ($config['openvpn']['openvpn-server'] as &$server) {
			if ($server['interface'] == $interface || empty($interface) || (!empty($gwgroups) && in_array($server['interface'], $gwgroups))) {
				openvpn_resync_if_needed('server', $server, $interface);
			}
		}
	}

	if (is_array($config['openvpn']['openvpn-client'])) {
		foreach ($config['openvpn']['openvpn-client'] as &$client) {
			if ($client['interface'] == $interface || empty($interface) || (!empty($gwgroups) && in_array($client['interface'], $gwgroups))) {
				openvpn_resync_if_needed('client', $client, $interface);
			}
		}
	}
}

unlock($openvpnlck);
?>