|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace Egulias\EmailValidator\Validation; |
|
4
|
|
|
|
|
5
|
|
|
use Egulias\EmailValidator\EmailLexer; |
|
6
|
|
|
use Egulias\EmailValidator\Result\InvalidEmail; |
|
7
|
|
|
use Egulias\EmailValidator\Result\Reason\DomainAcceptsNoMail; |
|
8
|
|
|
use Egulias\EmailValidator\Result\Reason\LocalOrReservedDomain; |
|
9
|
|
|
use Egulias\EmailValidator\Result\Reason\NoDNSRecord as ReasonNoDNSRecord; |
|
10
|
|
|
use Egulias\EmailValidator\Result\Reason\UnableToGetDNSRecord; |
|
11
|
|
|
use Egulias\EmailValidator\Warning\NoDNSMXRecord; |
|
12
|
|
|
use Egulias\EmailValidator\Warning\Warning; |
|
13
|
|
|
|
|
14
|
|
|
class DNSCheckValidation implements EmailValidation |
|
15
|
|
|
{ |
|
16
|
|
|
/** |
|
17
|
|
|
* @var int |
|
18
|
|
|
*/ |
|
19
|
|
|
protected const DNS_RECORD_TYPES_TO_CHECK = DNS_MX + DNS_A + DNS_AAAA; |
|
20
|
|
|
|
|
21
|
|
|
/** |
|
22
|
|
|
* Reserved Top Level DNS Names (https://tools.ietf.org/html/rfc2606#section-2), |
|
23
|
|
|
* mDNS and private DNS Namespaces (https://tools.ietf.org/html/rfc6762#appendix-G) |
|
24
|
|
|
* |
|
25
|
|
|
* @var string[] |
|
26
|
|
|
*/ |
|
27
|
|
|
public const RESERVED_DNS_TOP_LEVEL_NAMES = [ |
|
28
|
|
|
// Reserved Top Level DNS Names |
|
29
|
|
|
'test', |
|
30
|
|
|
'example', |
|
31
|
|
|
'invalid', |
|
32
|
|
|
'localhost', |
|
33
|
|
|
|
|
34
|
|
|
// mDNS |
|
35
|
|
|
'local', |
|
36
|
|
|
|
|
37
|
|
|
// Private DNS Namespaces |
|
38
|
|
|
'intranet', |
|
39
|
|
|
'internal', |
|
40
|
|
|
'private', |
|
41
|
|
|
'corp', |
|
42
|
|
|
'home', |
|
43
|
|
|
'lan', |
|
44
|
|
|
]; |
|
45
|
|
|
|
|
46
|
|
|
/** |
|
47
|
|
|
* @var Warning[] |
|
48
|
|
|
*/ |
|
49
|
|
|
private $warnings = []; |
|
50
|
|
|
|
|
51
|
|
|
/** |
|
52
|
|
|
* @var InvalidEmail|null |
|
53
|
|
|
*/ |
|
54
|
|
|
private $error; |
|
55
|
|
|
|
|
56
|
|
|
/** |
|
57
|
|
|
* @var array |
|
58
|
|
|
*/ |
|
59
|
|
|
private $mxRecords = []; |
|
60
|
|
|
|
|
61
|
|
|
/** |
|
62
|
|
|
* @var DNSGetRecordWrapper |
|
63
|
24 |
|
*/ |
|
64
|
|
|
private $dnsGetRecord; |
|
65
|
24 |
|
|
|
66
|
|
|
public function __construct(?DNSGetRecordWrapper $dnsGetRecord = null) |
|
67
|
|
|
{ |
|
68
|
|
|
if (!function_exists('idn_to_ascii')) { |
|
69
|
24 |
|
throw new \LogicException(sprintf('The %s class requires the Intl extension.', __CLASS__)); |
|
70
|
23 |
|
} |
|
71
|
|
|
|
|
72
|
|
|
if ($dnsGetRecord == null) { |
|
73
|
24 |
|
$dnsGetRecord = new DNSGetRecordWrapper(); |
|
74
|
|
|
} |
|
75
|
|
|
|
|
76
|
24 |
|
$this->dnsGetRecord = $dnsGetRecord; |
|
77
|
|
|
} |
|
78
|
|
|
|
|
79
|
24 |
|
public function isValid(string $email, EmailLexer $emailLexer): bool |
|
80
|
|
|
{ |
|
81
|
|
|
// use the input to check DNS if we cannot extract something similar to a domain |
|
82
|
24 |
|
$host = $email; |
|
83
|
12 |
|
|
|
84
|
|
|
// Arguable pattern to extract the domain. Not aiming to validate the domain nor the email |
|
85
|
|
|
if (false !== $lastAtPos = strrpos($email, '@')) { |
|
86
|
|
|
$host = substr($email, $lastAtPos + 1); |
|
87
|
24 |
|
} |
|
88
|
|
|
|
|
89
|
24 |
|
// Get the domain parts |
|
90
|
24 |
|
$hostParts = explode('.', $host); |
|
91
|
|
|
|
|
92
|
|
|
$isLocalDomain = count($hostParts) <= 1; |
|
93
|
24 |
|
$isReservedTopLevel = in_array($hostParts[(count($hostParts) - 1)], self::RESERVED_DNS_TOP_LEVEL_NAMES, true); |
|
94
|
11 |
|
|
|
95
|
11 |
|
// Exclude reserved top level DNS names |
|
96
|
|
|
if ($isLocalDomain || $isReservedTopLevel) { |
|
97
|
|
|
$this->error = new InvalidEmail(new LocalOrReservedDomain(), $host); |
|
98
|
13 |
|
return false; |
|
99
|
|
|
} |
|
100
|
|
|
|
|
101
|
14 |
|
return $this->checkDns($host); |
|
102
|
|
|
} |
|
103
|
14 |
|
|
|
104
|
|
|
public function getError(): ?InvalidEmail |
|
105
|
|
|
{ |
|
106
|
|
|
return $this->error; |
|
107
|
|
|
} |
|
108
|
|
|
|
|
109
|
|
|
/** |
|
110
|
|
|
* @return Warning[] |
|
111
|
|
|
*/ |
|
112
|
|
|
public function getWarnings(): array |
|
113
|
|
|
{ |
|
114
|
|
|
return $this->warnings; |
|
115
|
|
|
} |
|
116
|
13 |
|
|
|
117
|
|
|
/** |
|
118
|
13 |
|
* @param string $host |
|
119
|
|
|
* |
|
120
|
13 |
|
* @return bool |
|
121
|
|
|
*/ |
|
122
|
13 |
|
protected function checkDns($host) |
|
123
|
|
|
{ |
|
124
|
|
|
$variant = INTL_IDNA_VARIANT_UTS46; |
|
125
|
|
|
|
|
126
|
|
|
$host = rtrim(idn_to_ascii($host, IDNA_DEFAULT, $variant), '.'); |
|
127
|
|
|
|
|
128
|
|
|
$hostParts = explode('.', $host); |
|
129
|
|
|
$host = array_pop($hostParts); |
|
130
|
|
|
|
|
131
|
|
|
while (count($hostParts) > 0) { |
|
132
|
|
|
$host = array_pop($hostParts) . '.' . $host; |
|
133
|
13 |
|
|
|
134
|
|
|
if ($this->validateDnsRecords($host)) { |
|
135
|
13 |
|
return true; |
|
136
|
|
|
} |
|
137
|
13 |
|
} |
|
138
|
|
|
|
|
139
|
|
|
return false; |
|
140
|
|
|
} |
|
141
|
|
|
|
|
142
|
13 |
|
|
|
143
|
|
|
/** |
|
144
|
|
|
* Validate the DNS records for given host. |
|
145
|
13 |
|
* |
|
146
|
2 |
|
* @param string $host A set of DNS records in the format returned by dns_get_record. |
|
147
|
2 |
|
* |
|
148
|
|
|
* @return bool True on success. |
|
149
|
|
|
*/ |
|
150
|
|
|
private function validateDnsRecords($host): bool |
|
151
|
11 |
|
{ |
|
152
|
11 |
|
$dnsRecordsResult = $this->dnsGetRecord->getRecords($host, static::DNS_RECORD_TYPES_TO_CHECK); |
|
153
|
|
|
|
|
154
|
2 |
|
if ($dnsRecordsResult->withError()) { |
|
155
|
2 |
|
$this->error = new InvalidEmail(new UnableToGetDNSRecord(), ''); |
|
156
|
|
|
return false; |
|
157
|
2 |
|
} |
|
158
|
|
|
|
|
159
|
|
|
$dnsRecords = $dnsRecordsResult->getRecords(); |
|
160
|
9 |
|
|
|
161
|
|
|
// No MX, A or AAAA DNS records |
|
162
|
|
|
if ($dnsRecords === []) { |
|
163
|
|
|
$this->error = new InvalidEmail(new ReasonNoDNSRecord(), ''); |
|
164
|
|
|
return false; |
|
165
|
|
|
} |
|
166
|
|
|
|
|
167
|
|
|
// For each DNS record |
|
168
|
|
|
foreach ($dnsRecords as $dnsRecord) { |
|
169
|
|
|
if (!$this->validateMXRecord($dnsRecord)) { |
|
170
|
11 |
|
// No MX records (fallback to A or AAAA records) |
|
171
|
|
|
if (empty($this->mxRecords)) { |
|
172
|
11 |
|
$this->warnings[NoDNSMXRecord::CODE] = new NoDNSMXRecord(); |
|
173
|
1 |
|
} |
|
174
|
1 |
|
return false; |
|
175
|
|
|
} |
|
176
|
|
|
} |
|
177
|
10 |
|
return true; |
|
178
|
10 |
|
} |
|
179
|
|
|
|
|
180
|
|
|
/** |
|
181
|
|
|
* Validate an MX record |
|
182
|
10 |
|
* |
|
183
|
1 |
|
* @param array $dnsRecord Given DNS record. |
|
184
|
1 |
|
* |
|
185
|
|
|
* @return bool True if valid. |
|
186
|
|
|
*/ |
|
187
|
9 |
|
private function validateMxRecord($dnsRecord): bool |
|
188
|
|
|
{ |
|
189
|
9 |
|
if (!isset($dnsRecord['type'])) { |
|
190
|
|
|
$this->error = new InvalidEmail(new ReasonNoDNSRecord(), ''); |
|
191
|
|
|
return false; |
|
192
|
|
|
} |
|
193
|
|
|
|
|
194
|
|
|
if ($dnsRecord['type'] !== 'MX') { |
|
195
|
|
|
return true; |
|
196
|
|
|
} |
|
197
|
|
|
|
|
198
|
|
|
// "Null MX" record indicates the domain accepts no mail (https://tools.ietf.org/html/rfc7505) |
|
199
|
|
|
if (empty($dnsRecord['target']) || $dnsRecord['target'] === '.') { |
|
200
|
|
|
$this->error = new InvalidEmail(new DomainAcceptsNoMail(), ""); |
|
201
|
|
|
return false; |
|
202
|
|
|
} |
|
203
|
|
|
|
|
204
|
|
|
$this->mxRecords[] = $dnsRecord; |
|
205
|
|
|
|
|
206
|
|
|
return true; |
|
207
|
|
|
} |
|
208
|
|
|
} |
|
209
|
|
|
|
egulias /
EmailValidator
