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42c80841 NL |
1 | <?php |
2 | /** | |
3 | * SimplePie | |
4 | * | |
5 | * A PHP-Based RSS and Atom Feed Framework. | |
6 | * Takes the hard work out of managing a complete RSS/Atom solution. | |
7 | * | |
8 | * Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors | |
9 | * All rights reserved. | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without modification, are | |
12 | * permitted provided that the following conditions are met: | |
13 | * | |
14 | * * Redistributions of source code must retain the above copyright notice, this list of | |
15 | * conditions and the following disclaimer. | |
16 | * | |
17 | * * Redistributions in binary form must reproduce the above copyright notice, this list | |
18 | * of conditions and the following disclaimer in the documentation and/or other materials | |
19 | * provided with the distribution. | |
20 | * | |
21 | * * Neither the name of the SimplePie Team nor the names of its contributors may be used | |
22 | * to endorse or promote products derived from this software without specific prior | |
23 | * written permission. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS | |
26 | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY | |
27 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS | |
28 | * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
30 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
32 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
33 | * POSSIBILITY OF SUCH DAMAGE. | |
34 | * | |
35 | * @package SimplePie | |
36 | * @version 1.3.1 | |
37 | * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue | |
38 | * @author Ryan Parman | |
39 | * @author Geoffrey Sneddon | |
40 | * @author Ryan McCue | |
41 | * @link http://simplepie.org/ SimplePie | |
42 | * @license http://www.opensource.org/licenses/bsd-license.php BSD License | |
43 | */ | |
44 | ||
45 | ||
46 | /** | |
47 | * Class to validate and to work with IPv6 addresses. | |
48 | * | |
49 | * @package SimplePie | |
50 | * @subpackage HTTP | |
51 | * @copyright 2003-2005 The PHP Group | |
52 | * @license http://www.opensource.org/licenses/bsd-license.php | |
53 | * @link http://pear.php.net/package/Net_IPv6 | |
54 | * @author Alexander Merz <alexander.merz@web.de> | |
55 | * @author elfrink at introweb dot nl | |
56 | * @author Josh Peck <jmp at joshpeck dot org> | |
57 | * @author Geoffrey Sneddon <geoffers@gmail.com> | |
58 | */ | |
59 | class SimplePie_Net_IPv6 | |
60 | { | |
61 | /** | |
62 | * Uncompresses an IPv6 address | |
63 | * | |
64 | * RFC 4291 allows you to compress concecutive zero pieces in an address to | |
65 | * '::'. This method expects a valid IPv6 address and expands the '::' to | |
66 | * the required number of zero pieces. | |
67 | * | |
68 | * Example: FF01::101 -> FF01:0:0:0:0:0:0:101 | |
69 | * ::1 -> 0:0:0:0:0:0:0:1 | |
70 | * | |
71 | * @author Alexander Merz <alexander.merz@web.de> | |
72 | * @author elfrink at introweb dot nl | |
73 | * @author Josh Peck <jmp at joshpeck dot org> | |
74 | * @copyright 2003-2005 The PHP Group | |
75 | * @license http://www.opensource.org/licenses/bsd-license.php | |
76 | * @param string $ip An IPv6 address | |
77 | * @return string The uncompressed IPv6 address | |
78 | */ | |
79 | public static function uncompress($ip) | |
80 | { | |
81 | $c1 = -1; | |
82 | $c2 = -1; | |
83 | if (substr_count($ip, '::') === 1) | |
84 | { | |
85 | list($ip1, $ip2) = explode('::', $ip); | |
86 | if ($ip1 === '') | |
87 | { | |
88 | $c1 = -1; | |
89 | } | |
90 | else | |
91 | { | |
92 | $c1 = substr_count($ip1, ':'); | |
93 | } | |
94 | if ($ip2 === '') | |
95 | { | |
96 | $c2 = -1; | |
97 | } | |
98 | else | |
99 | { | |
100 | $c2 = substr_count($ip2, ':'); | |
101 | } | |
102 | if (strpos($ip2, '.') !== false) | |
103 | { | |
104 | $c2++; | |
105 | } | |
106 | // :: | |
107 | if ($c1 === -1 && $c2 === -1) | |
108 | { | |
109 | $ip = '0:0:0:0:0:0:0:0'; | |
110 | } | |
111 | // ::xxx | |
112 | else if ($c1 === -1) | |
113 | { | |
114 | $fill = str_repeat('0:', 7 - $c2); | |
115 | $ip = str_replace('::', $fill, $ip); | |
116 | } | |
117 | // xxx:: | |
118 | else if ($c2 === -1) | |
119 | { | |
120 | $fill = str_repeat(':0', 7 - $c1); | |
121 | $ip = str_replace('::', $fill, $ip); | |
122 | } | |
123 | // xxx::xxx | |
124 | else | |
125 | { | |
126 | $fill = ':' . str_repeat('0:', 6 - $c2 - $c1); | |
127 | $ip = str_replace('::', $fill, $ip); | |
128 | } | |
129 | } | |
130 | return $ip; | |
131 | } | |
132 | ||
133 | /** | |
134 | * Compresses an IPv6 address | |
135 | * | |
136 | * RFC 4291 allows you to compress concecutive zero pieces in an address to | |
137 | * '::'. This method expects a valid IPv6 address and compresses consecutive | |
138 | * zero pieces to '::'. | |
139 | * | |
140 | * Example: FF01:0:0:0:0:0:0:101 -> FF01::101 | |
141 | * 0:0:0:0:0:0:0:1 -> ::1 | |
142 | * | |
143 | * @see uncompress() | |
144 | * @param string $ip An IPv6 address | |
145 | * @return string The compressed IPv6 address | |
146 | */ | |
147 | public static function compress($ip) | |
148 | { | |
149 | // Prepare the IP to be compressed | |
150 | $ip = self::uncompress($ip); | |
151 | $ip_parts = self::split_v6_v4($ip); | |
152 | ||
153 | // Replace all leading zeros | |
154 | $ip_parts[0] = preg_replace('/(^|:)0+([0-9])/', '\1\2', $ip_parts[0]); | |
155 | ||
156 | // Find bunches of zeros | |
157 | if (preg_match_all('/(?:^|:)(?:0(?::|$))+/', $ip_parts[0], $matches, PREG_OFFSET_CAPTURE)) | |
158 | { | |
159 | $max = 0; | |
160 | $pos = null; | |
161 | foreach ($matches[0] as $match) | |
162 | { | |
163 | if (strlen($match[0]) > $max) | |
164 | { | |
165 | $max = strlen($match[0]); | |
166 | $pos = $match[1]; | |
167 | } | |
168 | } | |
169 | ||
170 | $ip_parts[0] = substr_replace($ip_parts[0], '::', $pos, $max); | |
171 | } | |
172 | ||
173 | if ($ip_parts[1] !== '') | |
174 | { | |
175 | return implode(':', $ip_parts); | |
176 | } | |
177 | else | |
178 | { | |
179 | return $ip_parts[0]; | |
180 | } | |
181 | } | |
182 | ||
183 | /** | |
184 | * Splits an IPv6 address into the IPv6 and IPv4 representation parts | |
185 | * | |
186 | * RFC 4291 allows you to represent the last two parts of an IPv6 address | |
187 | * using the standard IPv4 representation | |
188 | * | |
189 | * Example: 0:0:0:0:0:0:13.1.68.3 | |
190 | * 0:0:0:0:0:FFFF:129.144.52.38 | |
191 | * | |
192 | * @param string $ip An IPv6 address | |
193 | * @return array [0] contains the IPv6 represented part, and [1] the IPv4 represented part | |
194 | */ | |
195 | private static function split_v6_v4($ip) | |
196 | { | |
197 | if (strpos($ip, '.') !== false) | |
198 | { | |
199 | $pos = strrpos($ip, ':'); | |
200 | $ipv6_part = substr($ip, 0, $pos); | |
201 | $ipv4_part = substr($ip, $pos + 1); | |
202 | return array($ipv6_part, $ipv4_part); | |
203 | } | |
204 | else | |
205 | { | |
206 | return array($ip, ''); | |
207 | } | |
208 | } | |
209 | ||
210 | /** | |
211 | * Checks an IPv6 address | |
212 | * | |
213 | * Checks if the given IP is a valid IPv6 address | |
214 | * | |
215 | * @param string $ip An IPv6 address | |
216 | * @return bool true if $ip is a valid IPv6 address | |
217 | */ | |
218 | public static function check_ipv6($ip) | |
219 | { | |
220 | $ip = self::uncompress($ip); | |
221 | list($ipv6, $ipv4) = self::split_v6_v4($ip); | |
222 | $ipv6 = explode(':', $ipv6); | |
223 | $ipv4 = explode('.', $ipv4); | |
224 | if (count($ipv6) === 8 && count($ipv4) === 1 || count($ipv6) === 6 && count($ipv4) === 4) | |
225 | { | |
226 | foreach ($ipv6 as $ipv6_part) | |
227 | { | |
228 | // The section can't be empty | |
229 | if ($ipv6_part === '') | |
230 | return false; | |
231 | ||
232 | // Nor can it be over four characters | |
233 | if (strlen($ipv6_part) > 4) | |
234 | return false; | |
235 | ||
236 | // Remove leading zeros (this is safe because of the above) | |
237 | $ipv6_part = ltrim($ipv6_part, '0'); | |
238 | if ($ipv6_part === '') | |
239 | $ipv6_part = '0'; | |
240 | ||
241 | // Check the value is valid | |
242 | $value = hexdec($ipv6_part); | |
243 | if (dechex($value) !== strtolower($ipv6_part) || $value < 0 || $value > 0xFFFF) | |
244 | return false; | |
245 | } | |
246 | if (count($ipv4) === 4) | |
247 | { | |
248 | foreach ($ipv4 as $ipv4_part) | |
249 | { | |
250 | $value = (int) $ipv4_part; | |
251 | if ((string) $value !== $ipv4_part || $value < 0 || $value > 0xFF) | |
252 | return false; | |
253 | } | |
254 | } | |
255 | return true; | |
256 | } | |
257 | else | |
258 | { | |
259 | return false; | |
260 | } | |
261 | } | |
262 | ||
263 | /** | |
264 | * Checks if the given IP is a valid IPv6 address | |
265 | * | |
266 | * @codeCoverageIgnore | |
267 | * @deprecated Use {@see SimplePie_Net_IPv6::check_ipv6()} instead | |
268 | * @see check_ipv6 | |
269 | * @param string $ip An IPv6 address | |
270 | * @return bool true if $ip is a valid IPv6 address | |
271 | */ | |
272 | public static function checkIPv6($ip) | |
273 | { | |
274 | return self::check_ipv6($ip); | |
275 | } | |
276 | } |