includes/libs/UDPTransport.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  */
  20
  21 /**
  22  * A generic class to send a message over UDP
  23  *
  24  * If a message prefix is provided to the constructor or via
  25  * UDPTransport::newFromString(), the payload of the UDP datagrams emitted
  26  * will be formatted with the prefix and a single space at the start of each
  27  * line. This is the payload format expected by the udp2log service.
  28  *
  29  * @since 1.25
  30  */
  31 class UDPTransport {
  32         private $host, $port, $prefix, $domain;
  33
  34         /**
  35          * @param string $host IP address to send to
  36          * @param int $port port number
  37          * @param int $domain AF_INET or AF_INET6 constant
  38          * @param string|bool $prefix Prefix to use, false for no prefix
  39          */
  40         public function __construct( $host, $port, $domain, $prefix = false ) {
  41                 $this->host = $host;
  42                 $this->port = $port;
  43                 $this->domain = $domain;
  44                 $this->prefix = $prefix;
  45         }
  46
  47         /**
  48          * @param string $info In the format of "udp://host:port/prefix"
  49          * @return UDPTransport
  50          * @throws InvalidArgumentException
  51          */
  52         public static function newFromString( $info ) {
  53                 if ( preg_match( '!^udp:(?://)?\[([0-9a-fA-F:]+)\]:(\d+)(?:/(.*))?$!', $info, $m ) ) {
  54                         // IPv6 bracketed host
  55                         $host = $m[1];
  56                         $port = intval( $m[2] );
  57                         $prefix = isset( $m[3] ) ? $m[3] : false;
  58                         $domain = AF_INET6;
  59                 } elseif ( preg_match( '!^udp:(?://)?([a-zA-Z0-9.-]+):(\d+)(?:/(.*))?$!', $info, $m ) ) {
  60                         $host = $m[1];
  61                         if ( !IP::isIPv4( $host ) ) {
  62                                 $host = gethostbyname( $host );
  63                         }
  64                         $port = intval( $m[2] );
  65                         $prefix = isset( $m[3] ) ? $m[3] : false;
  66                         $domain = AF_INET;
  67                 } else {
  68                         throw new InvalidArgumentException( __METHOD__ . ': Invalid UDP specification' );
  69                 }
  70
  71                 return new self( $host, $port, $domain, $prefix );
  72         }
  73
  74         /**
  75          * @param string $text
  76          */
  77         public function emit( $text ) {
  78                 // Clean it up for the multiplexer
  79                 if ( $this->prefix !== false ) {
  80                         $text = preg_replace( '/^/m', $this->prefix . ' ', $text );
  81
  82                         // Limit to 64KB
  83                         if ( strlen( $text ) > 65506 ) {
  84                                 $text = substr( $text, 0, 65506 );
  85                         }
  86
  87                         if ( substr( $text, -1 ) != "\n" ) {
  88                                 $text .= "\n";
  89                         }
  90                 } elseif ( strlen( $text ) > 65507 ) {
  91                         $text = substr( $text, 0, 65507 );
  92                 }
  93
  94                 $sock = socket_create( $this->domain, SOCK_DGRAM, SOL_UDP );
  95                 if ( !$sock ) { // @todo should this throw an exception?
  96                         return;
  97                 }
  98
  99                 socket_sendto( $sock, $text, strlen( $text ), 0, $this->host, $this->port );
 100                 socket_close( $sock );
 101         }
 102 }