#!/usr/local/bin/php
<?php

/*
 * Copyright (C) 2022 Markus Reiter <me@reitermark.us>
 * 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.
 */

require_once("config.inc");
require_once("util.inc");
require_once('interfaces.inc');
require_once("plugins.inc.d/mdnsrepeater.inc");

$mdns_repeater = new \OPNsense\MDNSRepeater\MDNSRepeater();
$mdns_repeater_carp_enabled =
    (string)$mdns_repeater->enabled == '1' &&
    (string)$mdns_repeater->enablecarp == '1';

if ($mdns_repeater_carp_enabled) {
    $subsystem = !empty($argv[1]) ? $argv[1] : '';
    $type = !empty($argv[2]) ? $argv[2] : '';

    if ($type != 'MASTER' && $type != 'BACKUP') {
        log_msg("Carp '$type' event unknown from source '{$subsystem}'");
        exit(1);
    }

    if (!strstr($subsystem, '@')) {
        log_msg("Carp '$type' event triggered from wrong source '{$subsystem}'");
        exit(1);
    }

    list ($vhid, $iface) = explode('@', $subsystem);

    $friendly_interface = convert_real_interface_to_friendly_interface_name($iface);
    $mdns_repeater_interfaces = explode(',', $mdns_repeater->interfaces);
    if (!in_array($friendly_interface, $mdns_repeater_interfaces)) {
        exit(0);
    }

    $backend = new \OPNsense\Core\Backend();

    switch ($type) {
        case 'MASTER':
            touch('/var/run/mdns-repeater.CARP_MASTER');
            $backend->configdRun('mdnsrepeater start');
            break;
        case 'BACKUP':
            @unlink('/var/run/mdns-repeater.CARP_MASTER');
            $backend->configdRun('mdnsrepeater stop');
            break;
    }
}
