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<?php
/**
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* A generic class to send a message over UDP
*
* If a message prefix is provided to the constructor or via
* UDPTransport::newFromString(), the payload of the UDP datagrams emitted
* will be formatted with the prefix and a single space at the start of each
* line. This is the payload format expected by the udp2log service.
*
* @since 1.25
*/
class UDPTransport {
private $host, $port, $prefix, $domain;
/**
* @param string $host IP address to send to
* @param int $port port number
* @param int $domain AF_INET or AF_INET6 constant
* @param string|bool $prefix Prefix to use, false for no prefix
*/
public function __construct( $host, $port, $domain, $prefix = false ) {
$this->host = $host;
$this->port = $port;
$this->domain = $domain;
$this->prefix = $prefix;
}
/**
* @param string $info In the format of "udp://host:port/prefix"
* @return UDPTransport
* @throws InvalidArgumentException
*/
public static function newFromString( $info ) {
if ( preg_match( '!^udp:(?://)?\[([0-9a-fA-F:]+)\]:(\d+)(?:/(.*))?$!', $info, $m ) ) {
// IPv6 bracketed host
$host = $m[1];
$port = intval( $m[2] );
$prefix = isset( $m[3] ) ? $m[3] : false;
$domain = AF_INET6;
} elseif ( preg_match( '!^udp:(?://)?([a-zA-Z0-9.-]+):(\d+)(?:/(.*))?$!', $info, $m ) ) {
$host = $m[1];
if ( !IP::isIPv4( $host ) ) {
$host = gethostbyname( $host );
}
$port = intval( $m[2] );
$prefix = isset( $m[3] ) ? $m[3] : false;
$domain = AF_INET;
} else {
throw new InvalidArgumentException( __METHOD__ . ': Invalid UDP specification' );
}
return new self( $host, $port, $domain, $prefix );
}
/**
* @param string $text
*/
public function emit( $text ) {
// Clean it up for the multiplexer
if ( $this->prefix !== false ) {
$text = preg_replace( '/^/m', $this->prefix . ' ', $text );
// Limit to 64KB
if ( strlen( $text ) > 65506 ) {
$text = substr( $text, 0, 65506 );
}
if ( substr( $text, -1 ) != "\n" ) {
$text .= "\n";
}
} elseif ( strlen( $text ) > 65507 ) {
$text = substr( $text, 0, 65507 );
}
$sock = socket_create( $this->domain, SOCK_DGRAM, SOL_UDP );
if ( !$sock ) { // @todo should this throw an exception?
return;
}
socket_sendto( $sock, $text, strlen( $text ), 0, $this->host, $this->port );
socket_close( $sock );
}
}
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