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

/*
 * Copyright (C) 2018 Franco Fichtner <franco@opnsense.org>
 * Copyright (C) 2004 Scott Ullrich <sullrich@gmail.com>
 * 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/softether.inc');

if (softether_carp_enabled()) {
    // XXX: carp enable/disable mode
    $subsystem = !empty($argv[1]) ? $argv[1] : '';
    $type = !empty($argv[2]) ? $argv[2] : '';

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

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

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

    if (!(strpos(softether_carp_interfaces(),$friendly) !== false)) {
        exit(0);
    }

    switch ($type) {
        case 'MASTER':
            touch('/var/run/softether/CARP_MASTER');
            shell_exec('/usr/local/etc/rc.d/softether_server start');
            break;
        case 'BACKUP':
            if (file_exists('/var/run/softether/CARP_MASTER')) {
                unlink('/var/run/softether/CARP_MASTER');
            }
            shell_exec('/usr/local/etc/rc.d/softether_server stop');
            break;
    }
}
