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
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
|
<?php
/**
* SimplePie
*
* A PHP-Based RSS and Atom Feed Framework.
* Takes the hard work out of managing a complete RSS/Atom solution.
*
* Copyright (c) 2004-2016, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* * Neither the name of the SimplePie Team nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
* AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @package SimplePie
* @copyright 2004-2016 Ryan Parman, Geoffrey Sneddon, Ryan McCue
* @author Ryan Parman
* @author Geoffrey Sneddon
* @author Ryan McCue
* @link http://simplepie.org/ SimplePie
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
*/
/**
* Class to validate and to work with IPv6 addresses.
*
* @package SimplePie
* @subpackage HTTP
* @copyright 2003-2005 The PHP Group
* @license http://www.opensource.org/licenses/bsd-license.php
* @link http://pear.php.net/package/Net_IPv6
* @author Alexander Merz <alexander.merz@web.de>
* @author elfrink at introweb dot nl
* @author Josh Peck <jmp at joshpeck dot org>
* @author Geoffrey Sneddon <geoffers@gmail.com>
*/
class SimplePie_Net_IPv6
{
/**
* Uncompresses an IPv6 address
*
* RFC 4291 allows you to compress concecutive 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 http://www.opensource.org/licenses/bsd-license.php
* @param string $ip An IPv6 address
* @return string The uncompressed IPv6 address
*/
public static function uncompress($ip)
{
$c1 = -1;
$c2 = -1;
if (substr_count($ip, '::') === 1)
{
list($ip1, $ip2) = explode('::', $ip);
if ($ip1 === '')
{
$c1 = -1;
}
else
{
$c1 = substr_count($ip1, ':');
}
if ($ip2 === '')
{
$c2 = -1;
}
else
{
$c2 = substr_count($ip2, ':');
}
if (strpos($ip2, '.') !== false)
{
$c2++;
}
// ::
if ($c1 === -1 && $c2 === -1)
{
$ip = '0:0:0:0:0:0:0:0';
}
// ::xxx
else if ($c1 === -1)
{
$fill = str_repeat('0:', 7 - $c2);
$ip = str_replace('::', $fill, $ip);
}
// xxx::
else if ($c2 === -1)
{
$fill = str_repeat(':0', 7 - $c1);
$ip = str_replace('::', $fill, $ip);
}
// xxx::xxx
else
{
$fill = ':' . str_repeat('0:', 6 - $c2 - $c1);
$ip = str_replace('::', $fill, $ip);
}
}
return $ip;
}
/**
* Compresses an IPv6 address
*
* RFC 4291 allows you to compress concecutive 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 uncompress()
* @param string $ip An IPv6 address
* @return string The compressed IPv6 address
*/
public static function compress($ip)
{
// Prepare the IP to be compressed
$ip = self::uncompress($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);
}
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 $ip An IPv6 address
* @return array [0] contains the IPv6 represented part, and [1] the IPv4 represented part
*/
private static function split_v6_v4($ip)
{
if (strpos($ip, '.') !== false)
{
$pos = strrpos($ip, ':');
$ipv6_part = substr($ip, 0, $pos);
$ipv4_part = substr($ip, $pos + 1);
return array($ipv6_part, $ipv4_part);
}
return array($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)
{
$ip = self::uncompress($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;
}
return false;
}
/**
* Checks if the given IP is a valid IPv6 address
*
* @codeCoverageIgnore
* @deprecated Use {@see SimplePie_Net_IPv6::check_ipv6()} instead
* @see check_ipv6
* @param string $ip An IPv6 address
* @return bool true if $ip is a valid IPv6 address
*/
public static function checkIPv6($ip)
{
return self::check_ipv6($ip);
}
}
|
