Ticket #1348: iplookup_IPv6.patch

plugins/antispam/_prepend.php

@@ -13 +13 @@
 
 global $__autoload, $core;
 
+if (!class_exists('Net_IPv6')) {
+     $__autoload['Net_IPv6'] = dirname(__FILE__).'/inc/libs/IPv6.php';
+}
+
 $__autoload['dcSpamFilter'] = dirname(__FILE__).'/inc/class.dc.spamfilter.php';
 $__autoload['dcSpamFilters'] = dirname(__FILE__).'/inc/class.dc.spamfilters.php';
 $__autoload['dcAntispam'] = dirname(__FILE__).'/inc/lib.dc.antispam.php';

plugins/antispam/filters/class.dc.filter.iplookup.php

@@ -39 +39 @@
 
      public function isSpam($type,$author,$email,$site,$ip,$content,$post_id,&$status)
      {
-          if (!$ip || long2ip(ip2long($ip)) != $ip) {
+          # not an IP ?
+          if (!$ip) {
                return;
           }
+          # not an IPv4 ?
+          elseif(long2ip(ip2long($ip)) != $ip) {
+               # not an IPv6 ?
+               if (!Net_IPv6::checkIPv6($ip)) {
+                    return;
+               }
+          }
 
           $match = array();
 
@@ -108 +116 @@
 
      private function dnsblLookup($ip,$bl)
      {
-          $revIp = implode('.',array_reverse(explode('.',$ip)));
+          # Ipv6
+          if (Net_IPv6::checkIPv6($ip)) {
+               // expand "::" to "0"
+               $revIp = Net_IPv6::uncompress($ip,true);
+               // prepare dnsbl format
+               $revIp = str_split(str_replace(':','',$ip));
+          }
+          # IPv4
+          else {
+               $revIp = explode('.',$ip);
+          }
+          
+          $revIp = implode('.',array_reverse($revIp));
 
           $host = $revIp.'.'.$bl.'.';
           if (gethostbyname($host) != $host) {

new file plugins/antispam/inc/libs/IPv6.php

@@ +1 @@
+<?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   BSD 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 range to embedded IPv4 ip in an IPv6 address (RFC 4291, Section 2.5.5)
+ * @see getAddressType()
+ */
+define("NET_IPV6_IPV4MAPPING", 51);
+
+/**
+ * Address Type: Unspecified (RFC 4291, Section 2.5.2)
+ * @see getAddressType()
+ */
+define("NET_IPV6_UNSPECIFIED", 52);
+
+/**
+ * Address Type: Unspecified (RFC 4291, Section 2.5.3)
+ * @see getAddressType()
+ */
+define("NET_IPV6_LOOPBACK", 53);
+
+/**
+ * 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>
+ * @author    <elfrink at introweb dot nl>
+ * @author    Josh Peck <jmp at joshpeck dot org>
+ * @copyright 2003-2010 The PHP Group
+ * @license   BSD License http://www.opensource.org/licenses/bsd-license.php
+ * @version   Release: 1.1.0RC5
+ * @link      http://pear.php.net/package/Net_IPv6
+ */
+class Net_IPv6
+{
+
+    // {{{ separate()
+    /**
+     * Separates an IPv6 address into the address and a prefix length part
+     *
+     * @param String $ip the (compressed) IP as Hex representation
+     *
+     * @return Array the first element is the IP, the second the prefix length
+     * @since  1.2.0
+     * @access public
+     * @static     
+     */
+    function separate($ip) 
+    {
+        
+        $addr = $ip;
+        $spec = '';
+
+        if(false === strrpos($ip, '/')) {
+
+            return array($addr, $spec);
+
+        }
+
+        $elements = explode('/', $ip);
+
+        if(2 == count($elements)) {
+
+            $addr = $elements[0];
+            $spec = $elements[1];
+
+        }
+
+        return array($addr, $spec);
+
+    }
+    // }}}
+
+    // {{{ removeNetmaskSpec()
+
+    /**
+     * Removes a possible existing prefix length/ 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)
+    {
+
+        $elements = Net_IPv6::separate($ip);
+
+        return $elements[0];
+
+    }
+    // }}}
+    // {{{ removePrefixLength()
+
+    /**
+     * Tests for a prefix length specification in the address
+     * and removes the prefix length, if exists
+     *
+     * The method is technically identical to removeNetmaskSpec() and 
+     * will be dropped in a future release.
+     *
+     * @param String $ip a valid ipv6 address
+     *
+     * @return String the address without a prefix length
+     * @access public
+     * @static
+     * @see removeNetmaskSpec()
+     * @deprecated
+     */
+    function removePrefixLength($ip)
+    {
+        $pos = strrpos($ip, '/');
+
+        if (false !== $pos) {
+
+            return substr($ip, 0, $pos);
+
+        }
+
+        return $ip;
+    }
+
+    // }}}
+    // {{{ getNetmaskSpec()
+
+    /**
+     * Returns a possible existing prefix length/netmask specification on an IP addresse.
+     *
+     * @param String $ip the (compressed) IP as Hex representation
+     *
+     * @return String the netmask spec
+     * @since  1.1.0
+     * @access public
+     * @static
+     */
+    function getNetmaskSpec($ip) 
+    {
+
+        $elements = Net_IPv6::separate($ip);
+
+        return $elements[1];
+
+    }
+
+    // }}}
+    // {{{ getPrefixLength()
+
+    /**
+     * Tests for a prefix length specification in the address
+     * and returns the prefix length, if exists
+     *
+     * The method is technically identical to getNetmaskSpec() and 
+     * will be dropped in a future release.
+     *
+     * @param String $ip a valid ipv6 address
+     *
+     * @return Mixed the prefix as String or false, if no prefix was found
+     * @access public
+     * @static
+     * @deprecated
+     */
+    function getPrefixLength($ip) 
+    {
+        if (preg_match("/^([0-9a-fA-F:]{2,39})\/(\d{1,3})*$/", 
+                        $ip, $matches)) {
+
+            return $matches[2];
+
+        } else {
+
+            return false;
+
+        }
+
+    }
+
+    // }}}
+    // {{{ getNetmask()
+
+    /**
+     * Calculates the network prefix based on the netmask bits.
+     *
+     * @param String $ip   the (compressed) IP in Hex format
+     * @param int    $bits if the number of netmask bits is not part of the IP
+     *                     you must provide the number of bits
+     *
+     * @return String the network prefix
+     * @since  1.1.0
+     * @access public
+     * @static
+     */
+    function getNetmask($ip, $bits = null)
+    {
+        if (null==$bits) {
+
+            $elements = explode('/', $ip);
+
+            if (2 == count($elements)) {
+
+                $addr = $elements[0];
+                $bits = $elements[1];
+
+            } else {
+
+                include_once 'PEAR.php';
+
+                return PEAR::raiseError(NET_IPV6_NO_NETMASK_MSG,
+                                        NET_IPV6_NO_NETMASK);
+            }
+
+        } 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) {
+
+            $elements = explode('/', $ip);
+
+            if (2 == count($elements)) {
+
+                $ip   = $elements[0];
+                $bits = $elements[1];
+
+            } else if (null == $bits) {
+
+                $elements = explode('/', $netmask);
+
+                if (2 == count($elements)) {
+
+                     $netmask = $elements[0];
+                     $bits    = $elements[1];
+
+                }
+
+                if (null == $bits) {
+
+                    include_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 2373, 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 $ip the IP address in Hex format,
+     *                    compressed IPs are allowed
+     *
+     * @return int one of the addresse type constants
+     * @access public
+     * @since  1.1.0
+     * @static
+     *
+     * @see    NET_IPV6_UNASSIGNED
+     * @see    NET_IPV6_RESERVED
+     * @see    NET_IPV6_RESERVED_NSAP
+     * @see    NET_IPV6_RESERVED_IPX
+     * @see    NET_IPV6_RESERVED_UNICAST_GEOGRAPHIC
+     * @see    NET_IPV6_UNICAST_PROVIDER
+     * @see    NET_IPV6_MULTICAST
+     * @see    NET_IPV6_LOCAL_LINK
+     * @see    NET_IPV6_LOCAL_SITE
+     * @see    NET_IPV6_IPV4MAPPING  
+     * @see    NET_IPV6_UNSPECIFIED  
+     * @see    NET_IPV6_LOOPBACK  
+     * @see    NET_IPV6_UNKNOWN_TYPE
+     */
+    function getAddressType($ip) 
+    {
+        $ip    = Net_IPv6::removeNetmaskSpec($ip);
+        $binip = Net_IPv6::_ip2Bin($ip);
+
+        if(0 == strncmp(str_repeat('0', 128), $binip, 128)) { // ::/128
+
+            return NET_IPV6_UNSPECIFIED;
+
+        } else if(0 == strncmp(str_repeat('0', 127).'1', $binip, 128)) { // ::/128
+
+            return NET_IPV6_LOOPBACK;
+
+        } else if (0 == strncmp(str_repeat('0', 80).str_repeat('1', 16), $binip, 96)) { // ::ffff/96
+
+            return NET_IPV6_IPV4MAPPING; 
+
+        } else 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
+     *
+     * @param String $ip a valid IPv6-adress (hex format)
+     * @param Boolean $leadingZeros if true, leading zeros are added to each 
+     *                              block of the address 
+     *                              (FF01::101  ->  
+     *                               FF01:0000:0000:0000:0000:0000:0000:0101) 
+     *
+     * @return String the uncompressed IPv6-adress (hex format)
+     * @access public
+     * @see Compress()
+     * @static
+     * @author Pascal Uhlmann
+     */
+    function uncompress($ip, $leadingZeros = false)
+    {
+
+        $prefix = Net_IPv6::getPrefixLength($ip);
+
+        if (false === $prefix) {
+
+            $prefix = '';
+
+        } else {
+
+            $ip     = Net_IPv6::removePrefixLength($ip);
+            $prefix = '/'.$prefix;
+
+        }
+
+        $netmask = Net_IPv6::getNetmaskSpec($ip);
+        $uip     = Net_IPv6::removeNetmaskSpec($ip);
+
+        $c1 = -1;
+        $c2 = -1;
+
+        if (false !== strpos($uip, '::') ) {
+
+            list($ip1, $ip2) = explode('::', $uip);
+
+            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);
+
+            }
+        }
+
+        if(true == $leadingZeros) {
+            
+            $uipT    = array();
+            $uiparts = explode(':', $uip);
+
+            foreach($uiparts as $p) {
+
+                $uipT[] = sprintf('%04s', $p);
+            
+            }
+
+            $uip = implode(':', $uipT);
+        }
+
+        if ('' != $netmask) {
+
+                $uip = $uip.'/'.$netmask;
+
+        }
+
+        return $uip.$prefix;
+    }
+
+    // }}}
+    // {{{ 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
+     *
+     * Whe $ip is an already compressed adress the methode returns the value as is,
+     * also if the adress can be compressed further.
+     *
+     * Example: FF01::0:1 -> FF01::0:1
+     *
+     * To enforce maximum compression, you can set the second argument $force to true.
+     *
+     * Example: FF01::0:1 -> FF01::1 
+     *
+     * @param String  $ip    a valid IPv6-adress (hex format)
+     * @param boolean $force if true the adress will be compresses as best as possible (since 1.2.0)
+     *
+     * @return tring the compressed IPv6-adress (hex format)
+     * @access public
+     * @see    Uncompress()
+     * @static
+     * @author elfrink at introweb dot nl
+     */
+    function compress($ip, $force = false)  
+    {
+        
+        if(false !== strpos($ip, '::')) { // its already compressed
+
+            if(true == $force) {
+
+                $ip = Net_IPv6::uncompress($ip); 
+
+            } else {
+
+                return $ip;
+
+            }
+
+        }
+
+        $prefix = Net_IPv6::getPrefixLength($ip);
+
+        if (false === $prefix) {
+
+            $prefix = '';
+
+        } else {
+
+            $ip     = Net_IPv6::removePrefixLength($ip);
+            $prefix = '/'.$prefix;
+
+        }
+
+        $netmask = Net_IPv6::getNetmaskSpec($ip);
+        $ip      = Net_IPv6::removeNetmaskSpec($ip);
+
+        $ipp = explode(':', $ip);
+
+        for ($i = 0; $i < count($ipp); $i++) {
+
+            $ipp[$i] = dechex(hexdec($ipp[$i]));
+
+        }
+
+        $cip = ':' . join(':', $ipp) . ':';
+
+        preg_match_all("/(:0)(: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);
+
+        if ('' != $netmask) {
+
+            $cip = $cip.'/'.$netmask;
+
+        }
+
+        return $cip.$prefix;
+
+    }
+
+    // }}}
+    // {{{ recommendedFormat()
+    /**
+     * Represent IPv6 address in RFC5952 format.
+     *
+     * @param String  $ip a valid IPv6-adress (hex format)
+     *
+     * @return String the recommended representation of IPv6-adress (hex format)
+     * @access public
+     * @see    compress()
+     * @static
+     * @author koyama at hoge dot org
+     * @todo This method may become a part of compress() in a further releases
+     */
+    function recommendedFormat($ip)
+    {
+        $compressed = self::compress($ip, true);
+        // RFC5952 4.2.2
+        // The symbol "::" MUST NOT be used to shorten just one
+        // 16-bit 0 field.
+        if ((substr_count($compressed, ':') == 7) &&
+            (strpos($compressed, '::') !== false)) {
+            $compressed = str_replace('::', ':0:', $compressed);
+        }
+        return $compressed;
+    }
+    // }}}
+
+    // {{{ isCompressible()
+
+    /**
+     * Checks, if an IPv6 adress can be compressed
+     *
+     * @param String $ip a valid IPv6 adress
+     * 
+     * @return Boolean true, if adress can be compressed
+     * 
+     * @access public
+     * @since 1.2.0b
+     * @static
+     * @author Manuel Schmitt
+     */
+    function isCompressible($ip) 
+    {
+
+        return (bool)($ip != Net_IPv6::compress($address));
+
+    }    
+
+    // }}}
+    // {{{ 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
+     *
+     * @param String  $ip         a valid IPv6-adress (hex format)
+     * @param Boolean $uncompress if true, the address will be uncompressed 
+     *                            before processing
+     *
+     * @return Array  [0] contains the IPv6 part,
+     *                [1] the IPv4 part (hex format)
+     * @access public
+     * @static
+     */
+    function SplitV64($ip, $uncompress = true)
+    {
+        $ip = Net_IPv6::removeNetmaskSpec($ip);
+
+        if ($uncompress) {
+
+            $ip = Net_IPv6::Uncompress($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
+     *
+     * @param String $ip a valid IPv6-adress
+     *
+     * @return Boolean true if $ip is an IPv6 adress
+     * @access public
+     * @static
+     */
+    function checkIPv6($ip)
+    {
+
+        $elements = Net_IPv6::separate($ip);
+    
+        $ip = $elements[0];
+
+        if('' != $elements[1] && ( !is_numeric($elements[1]) || 0 > $elements || 128 < $elements[1])) {
+
+            return false;
+
+        } 
+
+        $ipPart = Net_IPv6::SplitV64($ip);
+        $count  = 0;
+
+        if (!empty($ipPart[0])) {
+            $ipv6 = explode(':', $ipPart[0]);
+
+            foreach($ipv6 as $element) { // made a validate precheck
+                if(!preg_match('/[0-9a-fA-F]*/', $element)) {
+                    return false;
+                }
+            }
+
+            for ($i = 0; $i < count($ipv6); $i++) {
+
+                if(4 < strlen($ipv6[$i])) {
+                    
+                    return false;
+
+                }
+
+                $dec = hexdec($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;
+
+            } else if (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;
+
+        }
+
+    }
+
+    // }}}
+
+    // {{{ _parseAddress()
+
+    /**
+     * Returns the lowest and highest IPv6 address
+     * for a given IP and netmask specification
+     * 
+     * The netmask may be a part of the $ip or 
+     * the number of netwask bits is provided via $bits
+     *
+     * The result is an indexed array. The key 'start'
+     * contains the lowest possible IP adress. The key
+     * 'end' the highest address.
+     *
+     * @param String $ipToParse the IPv6 address
+     * @param String $bits      the optional count of netmask bits
+     *
+     * @return Array ['start', 'end'] the lowest and highest IPv6 address
+     * @access public
+     * @static
+     * @author Nicholas Williams
+     */
+
+    function parseAddress($ipToParse, $bits = null)
+    {
+
+        $ip      = null;
+        $bitmask = null;
+
+        if ( null == $bits ) {  
+
+            $elements = explode('/', $ipToParse);
+
+            if ( 2 == count($elements) ) {
+
+                $ip      = Net_IPv6::uncompress($elements[0]);
+                $bitmask = $elements[1];
+
+            } else {
+
+                include_once 'PEAR.php';
+
+                return PEAR::raiseError(NET_IPV6_NO_NETMASK_MSG,
+                                        NET_IPV6_NO_NETMASK);
+            }
+        } else {
+
+            $ip      = Net_IPv6::uncompress($ipToParse);
+            $bitmask = $bits;
+
+        }
+
+        $binNetmask = str_repeat('1', $bitmask).
+                      str_repeat('0', 128 - $bitmask);
+        $maxNetmask = str_repeat('1', 128);
+        $netmask    = Net_IPv6::_bin2Ip($binNetmask);
+
+        $startAddress = Net_IPv6::_bin2Ip(Net_IPv6::_ip2Bin($ip)
+                                          & $binNetmask);
+        $endAddress   = Net_IPv6::_bin2Ip(Net_IPv6::_ip2Bin($ip)
+                                          | ($binNetmask ^ $maxNetmask));
+
+        return array('start' => $startAddress, 'end' => $endAddress);
+    }
+
+    // }}}
+
+    // {{{ _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 $bin the IP address as binary
+     *
+     * @return String the uncompressed Hex representation
+     * @access private
+     @ @since 1.1.0
+     */
+    function _bin2Ip($bin)
+    {
+        $ip = "";
+
+        if (strlen($bin) < 128) {
+
+            $bin = str_pad($bin, 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:
+ */
+
+?>