/
LibDnsResolver.php
156 lines (130 loc) · 4.52 KB
/
LibDnsResolver.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
<?php
/*
* This file is part of the Acme PHP project.
*
* (c) Titouan Galopin <galopintitouan@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace AcmePhp\Core\Challenge\Dns;
use AcmePhp\Cli\Exception\AcmeDnsResolutionException;
use LibDNS\Decoder\Decoder;
use LibDNS\Decoder\DecoderFactory;
use LibDNS\Encoder\Encoder;
use LibDNS\Encoder\EncoderFactory;
use LibDNS\Messages\MessageFactory;
use LibDNS\Messages\MessageTypes;
use LibDNS\Records\QuestionFactory;
use LibDNS\Records\ResourceTypes;
use Psr\Log\LoggerAwareTrait;
use Psr\Log\NullLogger;
/**
* Resolves DNS with LibDNS (pass over internal DNS cache and check several nameservers).
*
* @author Jérémy Derussé <jeremy@derusse.com>
*/
class LibDnsResolver implements DnsResolverInterface
{
use LoggerAwareTrait;
/**
* @var QuestionFactory
*/
private $questionFactory;
/**
* @var MessageFactory
*/
private $messageFactory;
/**
* @var Encoder
*/
private $encoder;
/**
* @var Decoder
*/
private $decoder;
/**
* @var string
*/
private $nameServer;
public function __construct(
QuestionFactory $questionFactory = null,
MessageFactory $messageFactory = null,
Encoder $encoder = null,
Decoder $decoder = null,
$nameServer = '8.8.8.8'
) {
$this->questionFactory = null === $questionFactory ? new QuestionFactory() : $questionFactory;
$this->messageFactory = null === $messageFactory ? new MessageFactory() : $messageFactory;
$this->encoder = null === $encoder ? (new EncoderFactory())->create() : $encoder;
$this->decoder = null === $decoder ? (new DecoderFactory())->create() : $decoder;
$this->nameServer = $nameServer;
$this->logger = new NullLogger();
}
/**
* @{@inheritdoc}
*/
public static function isSupported()
{
return class_exists(ResourceTypes::class);
}
/**
* @{@inheritdoc}
*/
public function getTxtEntries($domain)
{
$nsDomain = implode('.', array_slice(explode('.', rtrim($domain, '.')), -2));
$nameServers = $this->request(
$nsDomain,
ResourceTypes::NS,
$this->nameServer
);
$this->logger->debug('Fetched NS in charge of domain', ['nsDomain' => $nsDomain, 'servers' => $nameServers]);
if (empty($nameServers)) {
throw new AcmeDnsResolutionException(sprintf('Unable to find domain %s on nameserver %s', $domain, $this->nameServer));
}
$identicalEntries = [];
foreach ($nameServers as $nameServer) {
$ip = gethostbyname($nameServer);
$serverEntries = $this->request($domain, ResourceTypes::TXT, $ip);
$identicalEntries[json_encode($serverEntries)][] = $nameServer;
}
$this->logger->info('DNS records fetched', ['mapping' => $identicalEntries]);
if (1 !== count($identicalEntries)) {
throw new AcmeDnsResolutionException('Dns not fully propagated');
}
return json_decode(key($identicalEntries));
}
private function request($domain, $type, $nameServer)
{
$question = $this->questionFactory->create($type);
$question->setName(rtrim($domain, '.'));
// Create request message
$request = $this->messageFactory->create(MessageTypes::QUERY);
$request->getQuestionRecords()->add($question);
$request->isRecursionDesired(true);
// Send request
$socket = stream_socket_client(sprintf('udp://'.$nameServer.':53'));
stream_socket_sendto($socket, $this->encoder->encode($request));
$r = [$socket];
$w = $e = [];
if (!stream_select($r, $w, $e, 3)) {
throw new AcmeDnsResolutionException(sprintf('Timeout reached when requesting ServerName %s', $nameServer));
}
// Decode response message
$response = $this->decoder->decode(fread($socket, 512));
if (0 !== $response->getResponseCode()) {
throw new AcmeDnsResolutionException(
sprintf('ServerName respond with error code "%d"', $response->getResponseCode())
);
}
$entries = [];
foreach ($response->getAnswerRecords() as $record) {
foreach ($record->getData() as $field) {
$entries[] = (string) $field;
}
}
sort($entries);
return array_unique($entries);
}
}