[github/wallabag/wallabag.git] / inc / 3rdparty / libraries / simplepie / library / SimplePie / Net / IPv6.php

<?php
/**
 * SimplePie
 *
 * A PHP-Based RSS and Atom Feed Framework.
 * Takes the hard work out of managing a complete RSS/Atom solution.
 *
 * Copyright (c) 2004-2012, 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
 * @version 1.3.1
 * @copyright 2004-2012 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);
		}
		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 $ip An IPv6 address
	 * @return array [0] contains the IPv6 represented part, and [1] the IPv4 represented part
	 */
	private static function split_v6_v4($ip)
	{
		if (strpos($ip, '.') !== false)
		{
			$pos = strrpos($ip, ':');
			$ipv6_part = substr($ip, 0, $pos);
			$ipv4_part = substr($ip, $pos + 1);
			return array($ipv6_part, $ipv4_part);
		}
		else
		{
			return array($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;
		}
		else
		{
			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);
	}
}
Commit	Line	Data
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	}