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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 | use Wikimedia\IPUtils; |
22 | |
23 | /** |
24 | * A generic class to send a message over UDP |
25 | * |
26 | * If a message prefix is provided to the constructor or via |
27 | * UDPTransport::newFromString(), the payload of the UDP datagrams emitted |
28 | * will be formatted with the prefix and a single space at the start of each |
29 | * line. This is the payload format expected by the udp2log service. |
30 | * |
31 | * @since 1.25 |
32 | */ |
33 | class UDPTransport { |
34 | // Limit to 64 KiB |
35 | public const MAX_PAYLOAD_SIZE = 65507; |
36 | private string $host; |
37 | private int $port; |
38 | /** @var bool|string */ |
39 | private $prefix; |
40 | private int $domain; |
41 | |
42 | /** |
43 | * @param string $host IP address to send to |
44 | * @param int $port port number |
45 | * @param int $domain AF_INET or AF_INET6 constant |
46 | * @param string|bool $prefix Prefix to use, false for no prefix |
47 | */ |
48 | public function __construct( $host, $port, $domain, $prefix = false ) { |
49 | $this->host = $host; |
50 | $this->port = $port; |
51 | $this->domain = $domain; |
52 | $this->prefix = $prefix; |
53 | } |
54 | |
55 | /** |
56 | * @param string $info In the format of "udp://host:port/prefix" |
57 | * @return UDPTransport |
58 | */ |
59 | public static function newFromString( $info ) { |
60 | if ( preg_match( '!^udp:(?://)?\[([0-9a-fA-F:]+)\]:(\d+)(?:/(.*))?$!', $info, $m ) ) { |
61 | // IPv6 bracketed host |
62 | $host = $m[1]; |
63 | $port = intval( $m[2] ); |
64 | $prefix = $m[3] ?? false; |
65 | $domain = AF_INET6; |
66 | } elseif ( preg_match( '!^udp:(?://)?([a-zA-Z0-9.-]+):(\d+)(?:/(.*))?$!', $info, $m ) ) { |
67 | $host = $m[1]; |
68 | if ( !IPUtils::isIPv4( $host ) ) { |
69 | $host = gethostbyname( $host ); |
70 | } |
71 | $port = intval( $m[2] ); |
72 | $prefix = $m[3] ?? false; |
73 | $domain = AF_INET; |
74 | } else { |
75 | throw new InvalidArgumentException( __METHOD__ . ': Invalid UDP specification' ); |
76 | } |
77 | |
78 | return new self( $host, $port, $domain, $prefix ); |
79 | } |
80 | |
81 | /** |
82 | * @param string $text |
83 | */ |
84 | public function emit( $text ): void { |
85 | // Clean it up for the multiplexer |
86 | if ( $this->prefix !== false ) { |
87 | $text = preg_replace( '/^/m', $this->prefix . ' ', $text ); |
88 | |
89 | if ( strlen( $text ) > self::MAX_PAYLOAD_SIZE - 1 ) { |
90 | $text = substr( $text, 0, self::MAX_PAYLOAD_SIZE - 1 ); |
91 | } |
92 | |
93 | if ( substr( $text, -1 ) != "\n" ) { |
94 | $text .= "\n"; |
95 | } |
96 | } elseif ( strlen( $text ) > self::MAX_PAYLOAD_SIZE ) { |
97 | $text = substr( $text, 0, self::MAX_PAYLOAD_SIZE ); |
98 | } |
99 | |
100 | $sock = socket_create( $this->domain, SOCK_DGRAM, SOL_UDP ); |
101 | if ( !$sock ) { // @todo should this throw an exception? |
102 | return; |
103 | } |
104 | |
105 | socket_sendto( $sock, $text, strlen( $text ), 0, $this->host, $this->port ); |
106 | socket_close( $sock ); |
107 | } |
108 | } |