/* LibreNMS 
 *
 * Copyright (C) 2017 Paul Blasquez <pblasquez@gmail.com>
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>. */

$syslog_host = '127.0.0.1';
$syslog_port = 514;
$state = "Unknown";
$facility = 24; // Default facility is 3 * 8 (daemon)
$severity = 6; // Default severity is 6 (Informational)
$sev_txt = "OK";
$device = device_by_id_cache($obj['device_id']); // for event logging

if (!empty($opts['syslog_facility']) && preg_match("/^\d+$/", $opts['syslog_facility'])) {
    $facility = (int)$opts['syslog_facility'] * 8;
} else {
    log_event("Syslog facility is not an integer: " . $opts['syslog_facility'], $device, 'poller', 5);
}
if (!empty($opts['syslog_host'])) {
    if (preg_match("/[a-zA-Z]/", $opts['syslog_host'])) {
        $syslog_host = gethostbyname($opts['syslog_host']);
        if ($syslog_host === $opts['syslog_host']) {
          log_event("Alphanumeric hostname found but does not resolve to an IP.", $device, 'poller', 5);
          return false;
        }
    } elseif (filter_var($opts['syslog_host'], FILTER_VALIDATE_IP)) {
        $syslog_host = $opts['syslog_host'];
    } else {
        log_event("Syslog host is not a valid IP: " . $opts['syslog_host'], $device, 'poller', 5);
        return false;
    }
} else {
    log_event("Syslog host is empty.", $device, 'poller');
}
if (!empty($opts['syslog_port']) && preg_match("/^\d+$/", $opts['syslog_port'])) {
    $syslog_port = $opts['syslog_port'];
} else {
    log_event("Syslog port is not an integer.", $device, 'poller', 5);
}

switch( $obj['severity'] ) {
case "critical":
    $severity = 2;
    $sev_txt = "Critical";
    break;
case "warning":
    $severity = 4;
    $sev_txt = "Warning";
    break;
}

switch( $obj['state'] ) {
case 0:
    $state = "OK";
    $severity = 6;
    break;
case 1:
    $state = $sev_txt;
    break;
case 2:
    $state = "Acknowledged";
    $severity = 6;
    break;
}

$priority = $facility + $severity;

$syslog_prefix = '<'
  . $priority
  . '> '
  . date('M d H:i:s ')
  . gethostname()
  . ' librenms'
  . '['
  . $obj['device_id']
  . ']: '
  . $obj['hostname']
  . ': ['
  . $state
  . '] ' 
  . $obj['name']
;

if (($socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP)) === false) {
    log_event("socket_create() failed: reason: " . socket_strerror(socket_last_error()), $device, 'poller', 5);
    return false;
} else {
    if( !empty( $obj['faults'] ) ) {
        foreach($obj['faults'] as $k => $v) {
          $syslog_msg = $syslog_prefix . ' - ' . $v['string'];
          socket_sendto($socket, $syslog_msg, strlen($syslog_msg), 0, $syslog_host, $syslog_port);
        }
    } else {
        $syslog_msg = $syslog_prefix;
        socket_sendto($socket, $syslog_msg, strlen($syslog_msg), 0, $syslog_host, $syslog_port);
    }
    socket_close($socket);
}
return true;