219 lines
6.9 KiB
PHP
219 lines
6.9 KiB
PHP
<?php
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//
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// +----------------------------------------------------------------------+
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// | PHP Version 4 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 1997-2003 The PHP Group |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2.0 of the PHP license, |
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// | that is bundled with this package in the file LICENSE, and is |
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// | available at through the world-wide-web at |
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// | http://www.php.net/license/2_02.txt. |
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// | If you did not receive a copy of the PHP license and are unable to |
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// | obtain it through the world-wide-web, please send a note to |
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// | license@php.net so we can mail you a copy immediately. |
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// +----------------------------------------------------------------------+
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// | Authors: Alexander Merz <alexander.merz@web.de> |
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// +----------------------------------------------------------------------+
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//
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// $Id: IPv6.php,v 1.12 2005/09/01 12:42:00 alexmerz Exp $
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/**
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* Class to validate and to work with IPv6
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*
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* @author Alexander Merz <alexander.merz@t-online.de>
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* @author elfrink at introweb dot nl
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* @package Net_IPv6
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* @version $Id: IPv6.php,v 1.12 2005/09/01 12:42:00 alexmerz Exp $
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* @access public
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*/
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class Net_IPv6 {
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// {{{ Uncompress()
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/**
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* Uncompresses an IPv6 adress
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*
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* RFC 2373 allows you to compress zeros in an adress to '::'. This
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* function expects an valid IPv6 adress and expands the '::' to
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* the required zeros.
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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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* @access public
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* @see Compress()
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* @static
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* @param string $ip a valid IPv6-adress (hex format)
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* @return string the uncompressed IPv6-adress (hex format)
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*/
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function Uncompress($ip) {
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$uip = $ip;
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$c1 = -1;
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$c2 = -1;
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if (false !== strpos($ip, '::') ) {
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list($ip1, $ip2) = explode('::', $ip);
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if(""==$ip1) {
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$c1 = -1;
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} else {
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$pos = 0;
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if(0 < ($pos = substr_count($ip1, ':'))) {
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$c1 = $pos;
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} else {
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$c1 = 0;
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}
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}
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if(""==$ip2) {
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$c2 = -1;
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} else {
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$pos = 0;
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if(0 < ($pos = substr_count($ip2, ':'))) {
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$c2 = $pos;
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} else {
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$c2 = 0;
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}
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}
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if(strstr($ip2, '.')) {
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$c2++;
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}
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if(-1 == $c1 && -1 == $c2) { // ::
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$uip = "0:0:0:0:0:0:0:0";
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} else if(-1==$c1) { // ::xxx
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$fill = str_repeat('0:', 7-$c2);
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$uip = str_replace('::', $fill, $uip);
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} else if(-1==$c2) { // xxx::
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$fill = str_repeat(':0', 7-$c1);
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$uip = str_replace('::', $fill, $uip);
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} else { // xxx::xxx
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$fill = str_repeat(':0:', 6-$c2-$c1);
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$uip = str_replace('::', $fill, $uip);
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$uip = str_replace('::', ':', $uip);
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}
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}
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return $uip;
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}
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// }}}
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// {{{ Compress()
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/**
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* Compresses an IPv6 adress
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*
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* RFC 2373 allows you to compress zeros in an adress to '::'. This
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* function expects an valid IPv6 adress and compresses successive zeros
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* 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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* @access public
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* @see Uncompress()
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* @static
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* @param string $ip a valid IPv6-adress (hex format)
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* @return string the compressed IPv6-adress (hex format)
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* @author elfrink at introweb dot nl
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*/
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function Compress($ip) {
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$cip = $ip;
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if (!strstr($ip, '::')) {
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$ipp = explode(':',$ip);
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for($i=0; $i<count($ipp); $i++) {
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$ipp[$i] = dechex(hexdec($ipp[$i]));
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}
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$cip = ':' . join(':',$ipp) . ':';
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preg_match_all("/(:0)+/", $cip, $zeros);
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if (count($zeros[0])>0) {
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$match = '';
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foreach($zeros[0] as $zero) {
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if (strlen($zero) > strlen($match))
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$match = $zero;
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}
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$cip = preg_replace('/' . $match . '/', ':', $cip, 1);
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}
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$cip = preg_replace('/((^:)|(:$))/', '' ,$cip);
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$cip = preg_replace('/((^:)|(:$))/', '::' ,$cip);
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}
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return $cip;
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}
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// }}}
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// {{{ SplitV64()
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/**
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* Splits an IPv6 adress into the IPv6 and a possible IPv4 part
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*
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* RFC 2373 allows you to note the last two parts of an IPv6 adress as
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* an IPv4 compatible adress
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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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* @access public
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* @static
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* @param string $ip a valid IPv6-adress (hex format)
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* @return array [0] contains the IPv6 part, [1] the IPv4 part (hex format)
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*/
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function SplitV64($ip) {
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$ip = Net_IPv6::Uncompress($ip);
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if (strstr($ip, '.')) {
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$pos = strrpos($ip, ':');
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$ip{$pos} = '_';
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$ipPart = explode('_', $ip);
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return $ipPart;
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} else {
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return array($ip, "");
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}
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}
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// }}}
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// {{{ checkIPv6
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/**
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* Checks an IPv6 adress
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*
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* Checks if the given IP is IPv6-compatible
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*
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* @access public
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* @static
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* @param string $ip a valid IPv6-adress
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* @return boolean true if $ip is an IPv6 adress
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*/
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function checkIPv6($ip) {
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$ipPart = Net_IPv6::SplitV64($ip);
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$count = 0;
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if (!empty($ipPart[0])) {
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$ipv6 =explode(':', $ipPart[0]);
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for ($i = 0; $i < count($ipv6); $i++) {
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$dec = hexdec($ipv6[$i]);
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$hex = strtoupper(preg_replace("/^[0]{1,3}(.*[0-9a-fA-F])$/", "\\1", $ipv6[$i]));
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if ($ipv6[$i] >= 0 && $dec <= 65535 && $hex == strtoupper(dechex($dec))) {
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$count++;
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}
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}
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if (8 == $count) {
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return true;
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} elseif (6 == $count and !empty($ipPart[1])) {
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$ipv4 = explode('.',$ipPart[1]);
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$count = 0;
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for ($i = 0; $i < count($ipv4); $i++) {
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if ($ipv4[$i] >= 0 && (integer)$ipv4[$i] <= 255 && preg_match("/^\d{1,3}$/", $ipv4[$i])) {
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$count++;
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}
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}
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if (4 == $count) {
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return true;
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}
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} else {
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return false;
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}
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} else {
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return false;
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}
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}
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// }}}
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}
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?>
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