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IPv6.php
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IPv6.php
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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* This file contains the implementation of the Net_IPv6 class
*
* PHP versions 4 and 5
*
* LICENSE: This source file is subject to the New BSD license, that is
* available through the world-wide-web at http://www.opensource.org/licenses/bsd-license.php
* If you did not receive a copy of the new BSDlicense 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
*
* @category Net
* @package Net_IPv6
* @author Alexander Merz <alexander.merz@web.de>
* @copyright 2003-2005 The PHP Group
* @license http://www.opensource.org/licenses/bsd-license.php
* @version CVS: $Id$
* @link http://pear.php.net/package/Net_IPv6
*/
// {{{ constants
/**
* Error message if netmask bits was not found
* @see isInNetmask
*/
define("NET_IPV6_NO_NETMASK_MSG", "Netmask length not found");
/**
* Error code if netmask bits was not found
* @see isInNetmask
*/
define("NET_IPV6_NO_NETMASK", 10);
/**
* Address Type: Unassigned (RFC 1884, Section 2.3)
* @see getAddressType()
*/
define("NET_IPV6_UNASSIGNED", 1);
/**
* Address Type: Reserved (RFC 1884, Section 2.3)
* @see getAddressType()
*/
define("NET_IPV6_RESERVED", 11);
/**
* Address Type: Reserved for NSAP Allocation (RFC 1884, Section 2.3)
* @see getAddressType()
*/
define("NET_IPV6_RESERVED_NSAP", 12);
/**
* Address Type: Reserved for IPX Allocation (RFC 1884, Section 2.3)
* @see getAddressType()
*/
define("NET_IPV6_RESERVED_IPX", 13);
/**
* Address Type: Reserved for Geographic-Based Unicast Addresses (RFC 1884, Section 2.3)
* @see getAddressType()
*/
define("NET_IPV6_RESERVED_UNICAST_GEOGRAPHIC", 14);
/**
* Address Type: Provider-Based Unicast Address (RFC 1884, Section 2.3)
* @see getAddressType()
*/
define("NET_IPV6_UNICAST_PROVIDER", 22);
/**
* Address Type: Multicast Addresses (RFC 1884, Section 2.3)
* @see getAddressType()
*/
define("NET_IPV6_MULTICAST", 31);
/**
* Address Type: Link Local Use Addresses (RFC 1884, Section 2.3)
* @see getAddressType()
*/
define("NET_IPV6_LOCAL_LINK", 42);
/**
* Address Type: Link Local Use Addresses (RFC 1884, Section 2.3)
* @see getAddressType()
*/
define("NET_IPV6_LOCAL_SITE", 43);
/**
* Address Type: address can not assigned to a specific type
* @see getAddressType()
*/
define("NET_IPV6_UNKNOWN_TYPE", 1001);
// }}}
// {{{ Net_IPv6
/**
* Class to validate and to work with IPv6 addresses.
*
* @category Net
* @package Net_IPv6
* @author Alexander Merz <alexander.merz@web.de>
* @copyright 2003-2005 The PHP Group
* @license http://www.opensource.org/licenses/bsd-license.php
* @version CVS: $Id$
* @link http://pear.php.net/package/Net_IPv6
* @author elfrink at introweb dot nl
* @author Josh Peck <jmp at joshpeck dot org>
*/
class Net_IPv6 {
// {{{ removeNetmaskBits()
/**
* Removes a possible existing netmask specification at an IP addresse.
*
* @param String $ip the (compressed) IP as Hex representation
* @return String the IP without netmask length
* @since 1.1.0
* @access public
* @static
*/
function removeNetmaskSpec($ip) {
if(false !== strpos($ip, '/')) {
list($addr, $nm) = explode('/', $ip);
} else {
$addr = $ip;
}
return $addr;
}
// }}}
// {{{ getNetmask()
/**
* Calculates the network prefix based on the netmask bits.
*
* @param String $ip the (compressed) IP in Hex format
* @param int $bits if the number of netmask bits is not part of the IP
* you must provide the mumber of bits
* @return String the network prefix
* @since 1.1.0
* @access public
* @static
*/
function getNetmask($ip, $bits = null) {
if(null==$bits) {
list($addr, $bits) = explode('/', $ip);
} else {
$addr = $ip;
}
$addr = Net_IPv6::uncompress($addr);
$binNetmask = str_repeat('1', $bits).str_repeat('0', 128 - $bits);
return Net_IPv6::_bin2Ip(Net_IPv6::_ip2Bin($addr) & $binNetmask);
}
// }}}
// {{{ isInNetmask()
/**
* Checks if an (compressed) IP is in a specific address space.
*
* IF the IP does not contains the number of netmask bits (F8000::FFFF/16)
* then you have to use the $bits parameter.
*
* @param String $ip the IP to check (eg. F800::FFFF)
* @param String $netmask the netmask (eg F800::)
* @param int $bits the number of netmask bits to compare, if not given in $ip
* @return boolean true if $ip is in the netmask
* @since 1.1.0
* @access public
* @static
*/
function isInNetmask($ip, $netmask, $bits=null) {
// try to get the bit count
if(null == $bits) {
list($ip, $bits) = explode('/', $ip);
if("" == $bits) {
list($netmask, $bits) = explode('/', $netmask);
if("" == $bits) {
require_once 'PEAR.php';
return PEAR::raiseError(NET_IPV6_NO_NETMASK_MSG, NET_IPV6_NO_NETMASK);
}
}
}
$binIp = Net_IPv6::_ip2Bin(Net_IPv6::removeNetmaskSpec($ip));
$binNetmask = Net_IPv6::_ip2Bin(Net_IPv6::removeNetmaskSpec($netmask));
if(null != $bits && "" != $bits && 0 == strncmp( $binNetmask, $binIp, $bits)) {
return true;
}
return false;
}
// }}}
// {{{ getAddressType()
/**
* Returns the type of an IPv6 address.
*
* RFC 1883, Section 2.3 describes several types of addresses in
* the IPv6 addresse space.
* Several addresse types are markers for reserved spaces and as consequence
* a subject to change.
*
* @param String $ip the IP address in Hex format, compressed IPs are allowed
* @return int one of the addresse type constants
* @access public
* @since 1.1.0
* @static
*
* @see NET_IPV6_UNASSIGNED
* @see NET_IPV6_RESERVED
* @see NET_IPV6_RESERVED_NSAP
* @see NET_IPV6_RESERVED_IPX
* @see NET_IPV6_RESERVED_UNICAST_GEOGRAPHIC
* @see NET_IPV6_UNICAST_PROVIDER
* @see NET_IPV6_MULTICAST
* @see NET_IPV6_LOCAL_LINK
* @see NET_IPV6_LOCAL_SITE
* @see NET_IPV6_UNKNOWN_TYPE
*/
function getAddressType($ip) {
$ip = Net_IPv6::removeNetmaskSpec($ip);
$binip = Net_IPv6::_ip2Bin($ip);
if(0 == strncmp('1111111010', $binip, 10)) {
return NET_IPV6_LOCAL_LINK;
} else if(0 == strncmp('1111111011', $binip, 10)) {
return NET_IPV6_LOCAL_SITE;
} else if (0 == strncmp('111111100', $binip, 9)) {
return NET_IPV6_UNASSIGNED;
} else if (0 == strncmp('11111111', $binip, 8)) {
return NET_IPV6_MULTICAST;
} else if (0 == strncmp('00000000', $binip, 8)) {
return NET_IPV6_RESERVED;
} else if (0 == strncmp('00000001', $binip, 8) ||
0 == strncmp('1111110', $binip, 7)) {
return NET_IPV6_UNASSIGNED;
} else if (0 == strncmp('0000001', $binip, 7)) {
return NET_IPV6_RESERVED_NSAP;
} else if (0 == strncmp('0000010', $binip, 7)) {
return NET_IPV6_RESERVED_IPX;;
} else if (0 == strncmp('0000011', $binip, 7) ||
0 == strncmp('111110', $binip, 6) ||
0 == strncmp('11110', $binip, 5) ||
0 == strncmp('00001', $binip, 5) ||
0 == strncmp('1110', $binip, 4) ||
0 == strncmp('0001', $binip, 4) ||
0 == strncmp('001', $binip, 3) ||
0 == strncmp('011', $binip, 3) ||
0 == strncmp('101', $binip, 3) ||
0 == strncmp('110', $binip, 3)) {
return NET_IPV6_UNASSIGNED;
} else if (0 == strncmp('010', $binip, 3)) {
return NET_IPV6_UNICAST_PROVIDER;
} else if (0 == strncmp('100', $binip, 3)) {
return NET_IPV6_RESERVED_UNICAST_GEOGRAPHIC;
}
return NET_IPV6_UNKNOWN_TYPE;
}
// }}}
// {{{ 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) {
$uip = Net_IPv6::removeNetmaskSpec($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 {
$c2 = 0;
}
}
if(strstr($ip2, '.')) {
$c2++;
}
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 $ip a valid IPv6-adress (hex format)
* @return string the compressed IPv6-adress (hex format)
* @author elfrink at introweb dot nl
*/
function Compress($ip) {
$cip = Net_IPv6::removeNetmaskSpec($ip);
if (!strstr($ip, '::')) {
$ipp = explode(':',$ip);
for($i=0; $i<count($ipp); $i++) {
$ipp[$i] = dechex(hexdec($ipp[$i]));
}
$cip = ':' . join(':',$ipp) . ':';
preg_match_all("/(:0)+/", $cip, $zeros);
if (count($zeros[0])>0) {
$match = '';
foreach($zeros[0] as $zero) {
if (strlen($zero) > strlen($match))
$match = $zero;
}
$cip = preg_replace('/' . $match . '/', ':', $cip, 1);
}
$cip = preg_replace('/((^:)|(:$))/', '' ,$cip);
$cip = preg_replace('/((^:)|(:$))/', '::' ,$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) {
$ip = Net_IPv6::removeNetmaskSpec($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) {
$ip = Net_IPv6::removeNetmaskSpec($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]);
$hex = strtoupper(preg_replace("/^[0]{1,3}(.*[0-9a-fA-F])$/", "\\1", $ipv6[$i]));
if ($ipv6[$i] >= 0 && $dec <= 65535 && $hex == strtoupper(dechex($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;
}
}
// }}}
// {{{ _ip2Bin()
/**
* Converts an IPv6 address from Hex into Binary representation.
*
* @param String $ip the IP to convert (a:b:c:d:e:f:g:h), compressed IPs are allowed
* @return String the binary representation
* @access private
@ @since 1.1.0
*/
function _ip2Bin($ip) {
$binstr = '';
$ip = Net_IPv6::removeNetmaskSpec($ip);
$ip = Net_IPv6::Uncompress($ip);
$parts = explode(':', $ip);
foreach($parts as $v) {
$str = base_convert($v, 16, 2);
$binstr .= str_pad($str, 16, '0', STR_PAD_LEFT);
}
return $binstr;
}
// }}}
// {{{ _bin2Ip()
/**
* Converts an IPv6 address from Binary into Hex representation.
*
* @param String $ip the IP as binary
* @return String the uncompressed Hex representation
* @access private
@ @since 1.1.0
*/
function _bin2Ip($bin) {
$ip = "";
if(strlen($bin)<128) {
$bin = str_pad($str, 128, '0', STR_PAD_LEFT);
}
$parts = str_split($bin, "16");
foreach($parts as $v) {
$str = base_convert($v, 2, 16);
$ip .= $str.":";
}
$ip = substr($ip, 0,-1);
return $ip;
}
// }}}
}
// }}}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* c-hanging-comment-ender-p: nil
* End:
*/
?>