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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
<?php
/**
* Class to validate and to work with IPv6 addresses
*
* @package Requests\Utilities
*/
namespace WpOrg\Requests;
use WpOrg\Requests\Exception\InvalidArgument;
use WpOrg\Requests\Utility\InputValidator;
/**
* Class to validate and to work with IPv6 addresses
*
* This was originally based on the PEAR class of the same name, but has been
* entirely rewritten.
*
* @package Requests\Utilities
*/
final class Ipv6 {
/**
* Uncompresses an IPv6 address
*
* RFC 4291 allows you to compress consecutive zero pieces in an address to
* '::'. This method expects a valid IPv6 address and expands the '::' to
* the required number of zero pieces.
*
* Example: FF01::101 -> FF01:0:0:0:0:0:0:101
* ::1 -> 0:0:0:0:0:0:0:1
*
* @author Alexander Merz <alexander.merz@web.de>
* @author elfrink at introweb dot nl
* @author Josh Peck <jmp at joshpeck dot org>
* @copyright 2003-2005 The PHP Group
* @license https://opensource.org/licenses/bsd-license.php
*
* @param string|Stringable $ip An IPv6 address
* @return string The uncompressed IPv6 address
*
* @throws \WpOrg\Requests\Exception\InvalidArgument When the passed argument is not a string or a stringable object.
*/
public static function uncompress($ip) {
if (InputValidator::is_string_or_stringable($ip) === false) {
throw InvalidArgument::create(1, '$ip', 'string|Stringable', gettype($ip));
}
$ip = (string) $ip;
if (substr_count($ip, '::') !== 1) {
return $ip;
}
list($ip1, $ip2) = explode('::', $ip);
$c1 = ($ip1 === '') ? -1 : substr_count($ip1, ':');
$c2 = ($ip2 === '') ? -1 : substr_count($ip2, ':');
if (strpos($ip2, '.') !== false) {
$c2++;
}
if ($c1 === -1 && $c2 === -1) {
// ::
$ip = '0:0:0:0:0:0:0:0';
} elseif ($c1 === -1) {
// ::xxx
$fill = str_repeat('0:', 7 - $c2);
$ip = str_replace('::', $fill, $ip);
} elseif ($c2 === -1) {
// xxx::
$fill = str_repeat(':0', 7 - $c1);
$ip = str_replace('::', $fill, $ip);
} else {
// xxx::xxx
$fill = ':' . str_repeat('0:', 6 - $c2 - $c1);
$ip = str_replace('::', $fill, $ip);
}
return $ip;
}
/**
* Compresses an IPv6 address
*
* RFC 4291 allows you to compress consecutive zero pieces in an address to
* '::'. This method expects a valid IPv6 address and compresses consecutive
* zero pieces to '::'.
*
* Example: FF01:0:0:0:0:0:0:101 -> FF01::101
* 0:0:0:0:0:0:0:1 -> ::1
*
* @see \WpOrg\Requests\Ipv6::uncompress()
*
* @param string $ip An IPv6 address
* @return string The compressed IPv6 address
*/
public static function compress($ip) {
// Prepare the IP to be compressed.
// Note: Input validation is handled in the `uncompress()` method, which is the first call made in this method.
$ip = self::uncompress($ip);
$ip_parts = self::split_v6_v4($ip);
// Replace all leading zeros
$ip_parts[0] = preg_replace('/(^|:)0+([0-9])/', '\1\2', $ip_parts[0]);
// Find bunches of zeros
if (preg_match_all('/(?:^|:)(?:0(?::|$))+/', $ip_parts[0], $matches, PREG_OFFSET_CAPTURE)) {
$max = 0;
$pos = null;
foreach ($matches[0] as $match) {
if (strlen($match[0]) > $max) {
$max = strlen($match[0]);
$pos = $match[1];
}
}
$ip_parts[0] = substr_replace($ip_parts[0], '::', $pos, $max);
}
if ($ip_parts[1] !== '') {
return implode(':', $ip_parts);
} else {
return $ip_parts[0];
}
}
/**
* Splits an IPv6 address into the IPv6 and IPv4 representation parts
*
* RFC 4291 allows you to represent the last two parts of an IPv6 address
* using the standard IPv4 representation
*
* Example: 0:0:0:0:0:0:13.1.68.3
* 0:0:0:0:0:FFFF:129.144.52.38
*
* @param string $ip An IPv6 address
* @return string[] [0] contains the IPv6 represented part, and [1] the IPv4 represented part
*/
private static function split_v6_v4($ip) {
if (strpos($ip, '.') !== false) {
$pos = strrpos($ip, ':');
$ipv6_part = substr($ip, 0, $pos);
$ipv4_part = substr($ip, $pos + 1);
return [$ipv6_part, $ipv4_part];
} else {
return [$ip, ''];
}
}
/**
* Checks an IPv6 address
*
* Checks if the given IP is a valid IPv6 address
*
* @param string $ip An IPv6 address
* @return bool true if $ip is a valid IPv6 address
*/
public static function check_ipv6($ip) {
// Note: Input validation is handled in the `uncompress()` method, which is the first call made in this method.
$ip = self::uncompress($ip);
list($ipv6, $ipv4) = self::split_v6_v4($ip);
$ipv6 = explode(':', $ipv6);
$ipv4 = explode('.', $ipv4);
if (count($ipv6) === 8 && count($ipv4) === 1 || count($ipv6) === 6 && count($ipv4) === 4) {
foreach ($ipv6 as $ipv6_part) {
// The section can't be empty
if ($ipv6_part === '') {
return false;
}
// Nor can it be over four characters
if (strlen($ipv6_part) > 4) {
return false;
}
// Remove leading zeros (this is safe because of the above)
$ipv6_part = ltrim($ipv6_part, '0');
if ($ipv6_part === '') {
$ipv6_part = '0';
}
// Check the value is valid
$value = hexdec($ipv6_part);
if (dechex($value) !== strtolower($ipv6_part) || $value < 0 || $value > 0xFFFF) {
return false;
}
}
if (count($ipv4) === 4) {
foreach ($ipv4 as $ipv4_part) {
$value = (int) $ipv4_part;
if ((string) $value !== $ipv4_part || $value < 0 || $value > 0xFF) {
return false;
}
}
}
return true;
} else {
return false;
}
}
}
|
