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This brings SimplePie in sync with the most up to date version, 1.5.5. This update brings many bug fixes, small enhancements, and PHP compatibility fixes for newer versions of PHP. For a full list of changes, see https://github.com/simplepie/simplepie/blob/master/CHANGELOG.md#155-may-1-2020. Props dshanske, slushman, etruel, wpshades, dmenard, desrosj, hareesh-pillai, stevenkword, jrf, Ipstenu, johnbillion. Fixes #36669. Built from https://develop.svn.wordpress.org/trunk@47733 git-svn-id: http://core.svn.wordpress.org/trunk@47509 1a063a9b-81f0-0310-95a4-ce76da25c4cd
270 lines
7.3 KiB
PHP
270 lines
7.3 KiB
PHP
<?php
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/**
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* SimplePie
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*
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* A PHP-Based RSS and Atom Feed Framework.
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* Takes the hard work out of managing a complete RSS/Atom solution.
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*
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* Copyright (c) 2004-2016, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are
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* permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* * Neither the name of the SimplePie Team nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
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* AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @package SimplePie
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* @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue
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* @author Ryan Parman
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* @author Sam Sneddon
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* @author Ryan McCue
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* @link http://simplepie.org/ SimplePie
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License
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*/
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/**
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* Class to validate and to work with IPv6 addresses.
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*
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* @package SimplePie
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* @subpackage HTTP
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* @copyright 2003-2005 The PHP Group
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* @license http://www.opensource.org/licenses/bsd-license.php
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* @link http://pear.php.net/package/Net_IPv6
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* @author Alexander Merz <alexander.merz@web.de>
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* @author elfrink at introweb dot nl
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* @author Josh Peck <jmp at joshpeck dot org>
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* @author Sam Sneddon <geoffers@gmail.com>
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*/
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class SimplePie_Net_IPv6
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{
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/**
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* Uncompresses an IPv6 address
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*
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* RFC 4291 allows you to compress concecutive zero pieces in an address to
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* '::'. This method expects a valid IPv6 address and expands the '::' to
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* the required number of zero pieces.
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*
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* Example: FF01::101 -> FF01:0:0:0:0:0:0:101
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* ::1 -> 0:0:0:0:0:0:0:1
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*
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* @author Alexander Merz <alexander.merz@web.de>
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* @author elfrink at introweb dot nl
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* @author Josh Peck <jmp at joshpeck dot org>
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* @copyright 2003-2005 The PHP Group
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* @license http://www.opensource.org/licenses/bsd-license.php
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* @param string $ip An IPv6 address
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* @return string The uncompressed IPv6 address
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*/
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public static function uncompress($ip)
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{
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$c1 = -1;
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$c2 = -1;
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if (substr_count($ip, '::') === 1)
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{
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list($ip1, $ip2) = explode('::', $ip);
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if ($ip1 === '')
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{
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$c1 = -1;
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}
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else
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{
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$c1 = substr_count($ip1, ':');
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}
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if ($ip2 === '')
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{
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$c2 = -1;
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}
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else
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{
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$c2 = substr_count($ip2, ':');
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}
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if (strpos($ip2, '.') !== false)
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{
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$c2++;
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}
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// ::
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if ($c1 === -1 && $c2 === -1)
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{
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$ip = '0:0:0:0:0:0:0:0';
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}
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// ::xxx
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else if ($c1 === -1)
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{
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$fill = str_repeat('0:', 7 - $c2);
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$ip = str_replace('::', $fill, $ip);
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}
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// xxx::
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else if ($c2 === -1)
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{
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$fill = str_repeat(':0', 7 - $c1);
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$ip = str_replace('::', $fill, $ip);
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}
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// xxx::xxx
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else
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{
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$fill = ':' . str_repeat('0:', 6 - $c2 - $c1);
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$ip = str_replace('::', $fill, $ip);
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}
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}
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return $ip;
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}
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/**
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* Compresses an IPv6 address
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*
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* RFC 4291 allows you to compress concecutive zero pieces in an address to
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* '::'. This method expects a valid IPv6 address and compresses consecutive
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* zero pieces to '::'.
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*
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* Example: FF01:0:0:0:0:0:0:101 -> FF01::101
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* 0:0:0:0:0:0:0:1 -> ::1
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*
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* @see uncompress()
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* @param string $ip An IPv6 address
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* @return string The compressed IPv6 address
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*/
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public static function compress($ip)
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{
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// Prepare the IP to be compressed
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$ip = self::uncompress($ip);
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$ip_parts = self::split_v6_v4($ip);
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// Replace all leading zeros
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$ip_parts[0] = preg_replace('/(^|:)0+([0-9])/', '\1\2', $ip_parts[0]);
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// Find bunches of zeros
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if (preg_match_all('/(?:^|:)(?:0(?::|$))+/', $ip_parts[0], $matches, PREG_OFFSET_CAPTURE))
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{
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$max = 0;
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$pos = null;
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foreach ($matches[0] as $match)
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{
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if (strlen($match[0]) > $max)
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{
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$max = strlen($match[0]);
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$pos = $match[1];
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}
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}
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$ip_parts[0] = substr_replace($ip_parts[0], '::', $pos, $max);
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}
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if ($ip_parts[1] !== '')
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{
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return implode(':', $ip_parts);
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}
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return $ip_parts[0];
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}
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/**
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* Splits an IPv6 address into the IPv6 and IPv4 representation parts
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*
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* RFC 4291 allows you to represent the last two parts of an IPv6 address
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* using the standard IPv4 representation
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*
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* Example: 0:0:0:0:0:0:13.1.68.3
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* 0:0:0:0:0:FFFF:129.144.52.38
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*
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* @param string $ip An IPv6 address
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* @return array [0] contains the IPv6 represented part, and [1] the IPv4 represented part
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*/
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private static function split_v6_v4($ip)
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{
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if (strpos($ip, '.') !== false)
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{
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$pos = strrpos($ip, ':');
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$ipv6_part = substr($ip, 0, $pos);
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$ipv4_part = substr($ip, $pos + 1);
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return array($ipv6_part, $ipv4_part);
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}
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return array($ip, '');
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}
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/**
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* Checks an IPv6 address
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*
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* Checks if the given IP is a valid IPv6 address
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*
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* @param string $ip An IPv6 address
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* @return bool true if $ip is a valid IPv6 address
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*/
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public static function check_ipv6($ip)
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{
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$ip = self::uncompress($ip);
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list($ipv6, $ipv4) = self::split_v6_v4($ip);
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$ipv6 = explode(':', $ipv6);
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$ipv4 = explode('.', $ipv4);
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if (count($ipv6) === 8 && count($ipv4) === 1 || count($ipv6) === 6 && count($ipv4) === 4)
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{
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foreach ($ipv6 as $ipv6_part)
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{
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// The section can't be empty
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if ($ipv6_part === '')
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return false;
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// Nor can it be over four characters
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if (strlen($ipv6_part) > 4)
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return false;
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// Remove leading zeros (this is safe because of the above)
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$ipv6_part = ltrim($ipv6_part, '0');
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if ($ipv6_part === '')
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$ipv6_part = '0';
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// Check the value is valid
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$value = hexdec($ipv6_part);
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if (dechex($value) !== strtolower($ipv6_part) || $value < 0 || $value > 0xFFFF)
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return false;
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}
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if (count($ipv4) === 4)
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{
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foreach ($ipv4 as $ipv4_part)
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{
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$value = (int) $ipv4_part;
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if ((string) $value !== $ipv4_part || $value < 0 || $value > 0xFF)
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return false;
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}
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}
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return true;
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}
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return false;
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}
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/**
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* Checks if the given IP is a valid IPv6 address
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*
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* @codeCoverageIgnore
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* @deprecated Use {@see SimplePie_Net_IPv6::check_ipv6()} instead
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* @see check_ipv6
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* @param string $ip An IPv6 address
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* @return bool true if $ip is a valid IPv6 address
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*/
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public static function checkIPv6($ip)
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{
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return self::check_ipv6($ip);
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}
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}
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