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
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: }
277: