mirror of https://github.com/friendica/friendica
100 lines
2.5 KiB
PHP
100 lines
2.5 KiB
PHP
<?php
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/**
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* Validates an IPv6 address.
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* @author Feyd @ forums.devnetwork.net (public domain)
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* @note This function requires brackets to have been removed from address
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* in URI.
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*/
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class HTMLPurifier_AttrDef_URI_IPv6 extends HTMLPurifier_AttrDef_URI_IPv4
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{
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public function validate($aIP, $config, $context) {
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if (!$this->ip4) $this->_loadRegex();
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$original = $aIP;
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$hex = '[0-9a-fA-F]';
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$blk = '(?:' . $hex . '{1,4})';
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$pre = '(?:/(?:12[0-8]|1[0-1][0-9]|[1-9][0-9]|[0-9]))'; // /0 - /128
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// prefix check
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if (strpos($aIP, '/') !== false)
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{
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if (preg_match('#' . $pre . '$#s', $aIP, $find))
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{
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$aIP = substr($aIP, 0, 0-strlen($find[0]));
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unset($find);
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}
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else
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{
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return false;
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}
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}
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// IPv4-compatiblity check
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if (preg_match('#(?<=:'.')' . $this->ip4 . '$#s', $aIP, $find))
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{
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$aIP = substr($aIP, 0, 0-strlen($find[0]));
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$ip = explode('.', $find[0]);
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$ip = array_map('dechex', $ip);
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$aIP .= $ip[0] . $ip[1] . ':' . $ip[2] . $ip[3];
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unset($find, $ip);
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}
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// compression check
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$aIP = explode('::', $aIP);
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$c = count($aIP);
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if ($c > 2)
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{
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return false;
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}
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elseif ($c == 2)
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{
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list($first, $second) = $aIP;
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$first = explode(':', $first);
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$second = explode(':', $second);
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if (count($first) + count($second) > 8)
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{
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return false;
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}
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while(count($first) < 8)
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{
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array_push($first, '0');
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}
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array_splice($first, 8 - count($second), 8, $second);
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$aIP = $first;
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unset($first,$second);
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}
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else
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{
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$aIP = explode(':', $aIP[0]);
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}
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$c = count($aIP);
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if ($c != 8)
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{
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return false;
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}
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// All the pieces should be 16-bit hex strings. Are they?
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foreach ($aIP as $piece)
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{
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if (!preg_match('#^[0-9a-fA-F]{4}$#s', sprintf('%04s', $piece)))
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{
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return false;
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}
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}
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return $original;
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}
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}
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// vim: et sw=4 sts=4
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