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<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Alexander Merz <alexander.merz@web.de> |
// +----------------------------------------------------------------------+
//
// $Id$
/**
* Class to validate and to work with IPv6
*
* Todo: some optimizations for checkIPv6()
*
* @author Alexander Merz <alexander.merz@t-online.de>
* @package Net_IPv6
* @version $Id$
* @access public
*/
class Net_IPv6 {
// {{{ Uncompress()
/**
* Uncompresses an IPv6 adress
*
* RFC 2373 allows you to compress zeros in an adress to '::'. This
* function expects an valid IPv6 adress and expands the '::' to
* the required zeros.
*
* Example: FF01::101 -> FF01:0:0:0:0:0:0:101
* ::1 -> 0:0:0:0:0:0:0:1
*
* @access public
* @see Compress()
* @static
* @param string $ip a valid IPv6-adress (hex format)
* @return string the uncompressed IPv6-adress (hex format)
*/
function Uncompress($ip) {
$uip = $ip;
$c1 = -1;
$c2 = -1;
if (false !== strpos($ip, '::') ) {
list($ip1, $ip2) = explode('::', $ip);
if(""==$ip1) {
$c1 = -1;
} else {
$pos = 0;
if(0 < ($pos = substr_count($ip1, ':'))) {
$c1 = $pos;
} else {
$c1 = 0;
}
}
if(""==$ip2) {
$c2 = -1;
} else {
$pos = 0;
if(0 < ($pos = substr_count($ip2, ':'))) {
$c2 = $pos;
} else {
$c2 = 0;
}
}
if(-1 == $c1 && -1 == $c2) { // ::
$uip = "0:0:0:0:0:0:0:0";
} else if(-1==$c1) { // ::xxx
$fill = str_repeat('0:', 7-$c2);
$uip = str_replace('::', $fill, $uip);
} else if(-1==$c2) { // xxx::
$fill = str_repeat(':0', 7-$c1);
$uip = str_replace('::', $fill, $uip);
} else { // xxx::xxx
$fill = str_repeat(':0:', 6-$c2-$c1);
$uip = str_replace('::', $fill, $uip);
$uip = str_replace('::', ':', $uip);
}
}
return $uip;
}
// }}}
// {{{ Compress()
/**
* Compresses an IPv6 adress
*
* RFC 2373 allows you to compress zeros in an adress to '::'. This
* function expects an valid IPv6 adress and compresses successive zeros
* to '::'
*
* Example: FF01:0:0:0:0:0:0:101 -> FF01::101
* 0:0:0:0:0:0:0:1 -> ::1
*
* @access public
* @see Uncompress()
* @static
* @param string $ip a valid IPv6-adress (hex format)
* @return string the compressed IPv6-adress (hex format)
*/
function Compress($ip) {
$cip = $ip;
if (!strstr($ip, "::")) {
$ipp = explode(':',$ip);
for($i=0; $i<count($ipp); $i++) {
$ipp[$i] = $ipp[$i];
if(hexdec($ipp[$i])>0) {
$ipp[$i]=$ipp[$i].'_';
}
}
$cip = join(':',$ipp);
$stop = false;
$pattern = "0:0";
$pos=-1;
while(!$stop) {
$pos = strpos($cip, $pattern);
if($pos === false) {
$stop = true;
$pos = -1;
} else {
$pattern = $pattern.":0";
}
}
$cip = preg_replace("/".substr($pattern,0,-2)."/", ':', $cip,1);
if(1!=strlen($cip)) {
$cip = str_replace(':::', '::', $cip);
$cip = str_replace('_', '', $cip);
} else {
$cip = "::";
}
}
return $cip;
}
// }}}
// {{{ SplitV64()
/**
* Splits an IPv6 adress into the IPv6 and a possible IPv4 part
*
* RFC 2373 allows you to note the last two parts of an IPv6 adress as
* an IPv4 compatible adress
*
* Example: 0:0:0:0:0:0:13.1.68.3
* 0:0:0:0:0:FFFF:129.144.52.38
*
* @access public
* @static
* @param string $ip a valid IPv6-adress (hex format)
* @return array [0] contains the IPv6 part, [1] the IPv4 part (hex format)
*/
function SplitV64($ip) {
$ip = Net_IPv6::Uncompress($ip);
if (strstr($ip, '.')) {
$pos = strrpos($ip, ':');
$ip{$pos} = '_';
$ipPart = explode('_', $ip);
return $ipPart;
} else {
return array($ip, "");
}
}
// }}}
// {{{ checkIPv6
/**
* Checks an IPv6 adress
*
* Checks if the given IP is IPv6-compatible
*
* @access public
* @static
* @param string $ip a valid IPv6-adress
* @return boolean true if $ip is an IPv6 adress
*/
function checkIPv6($ip) {
$ipPart = Net_IPv6::SplitV64($ip);
$count = 0;
if (!empty($ipPart[0])) {
$ipv6 = explode(':', $ipPart[0]);
for ($i = 0; $i < count($ipv6); $i++) {
$dec = hexdec($ipv6[$i]);
if ($ipv6[$i] >= 0 && $dec <= 65535 && $ipv6[$i] == strtoupper(dechex($dec))) {
$count++;
}
}
if (8 == $count) {
return true;
} elseif (6 == $count and !empty($ipPart[1])) {
$ipv4 = explode('.',$ipPart[1]);
$count = 0;
for ($i = 0; $i < count($ipv4); $i++) {
if ($ipv4[$i] >= 0 && (integer)$ipv4[$i] <= 255 && preg_match("/^\d{1,3}$/", $ipv4[$i])) {
$count++;
}
}
if (4 == $count) {
return true;
}
} else {
return false;
}
} else {
return false;
}
}
// }}}
}
?>
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