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IPv6.php (7493B)

---

 <?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, Sam 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, Sam Sneddon, Ryan McCue
  * @author Ryan Parman
  * @author Sam 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 Sam 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);
 	}
 }