#!/usr/local/bin/php-cgi -f
<?php
/*
 * rc.kill_states
 *
 * part of pfSense (https://www.pfsense.org)
 * Copyright (c) 2004-2016 Rubicon Communications, LLC (Netgate)
 * 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("interfaces.inc");
require_once("util.inc");

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

/* Interface address to cleanup states */
$interface = str_replace("\n", "", $argv[1]);

/* IP address to cleanup states */
$local_ip = str_replace("\n", "", $argv[2]);

if (empty($interface) || !does_interface_exist($interface)) {
	log_error("rc.kill_states: Invalid interface '{$interface}'");
	return;
}

if (!empty($local_ip)) {
	list($local_ip, $subnet_bits) = explode("/", $local_ip);

	if (empty($subnet_bits)) {
		$subnet_bits = "32";
	}

	if (!is_ipaddr($local_ip)) {
		log_error("rc.kill_states: Invalid IP address '{$local_ip}'");
		return;
	}
}

if (isset($config['system']['gw_down_kill_states'])) {
	if (!empty($local_ip)) {
		log_error("rc.kill_states: Removing states for IP {$local_ip}/{$subnet_bits}");
		$nat_states = exec_command("/sbin/pfctl -i {$interface} -ss | " .
			"/usr/bin/egrep '\-> +{$local_ip}:[0-9]+ +\->'");

		$cleared_states = array();
		foreach (explode("\n", $nat_states) as $nat_state) {
			if (preg_match_all('/([\d\.]+):[\d]+[\s->]+/i', $nat_state, $matches, PREG_SET_ORDER) != 3) {
				continue;
			}

			$src = $matches[0][1];
			$dst = $matches[2][1];

			if (empty($src) || empty($dst) || in_array("{$src},{$dst}", $cleared_states)) {
				continue;
			}

			$cleared_states[] = "{$src},{$dst}";
			pfSense_kill_states($src, $dst);
		}

		pfSense_kill_states("0.0.0.0/0", "{$local_ip}/{$subnet_bits}");
		pfSense_kill_states("{$local_ip}/{$subnet_bits}");
		pfSense_kill_srcstates("{$local_ip}/{$subnet_bits}");
	}
	log_error("rc.kill_states: Removing states for interface {$interface}");
	mwexec("/sbin/pfctl -i {$interface} -Fs", true);
}