Making IPB IPv6 capable

[NewEraCracker]

			//-----------------------------------------
			// IP Address
			//-----------------------------------------

			if ( ipsRegistry::$settings['xforward_matching'] )
			{
				foreach( array_reverse( explode( ',', my_getenv('HTTP_X_FORWARDED_FOR') ) ) as $x_f )
				{
					$x_f = trim($x_f);

					if ( preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $x_f ) )
					{
						$addrs[] = $x_f;
					}
					
				}

				$addrs[] = my_getenv('HTTP_CLIENT_IP');
				$addrs[] = my_getenv('HTTP_X_CLUSTER_CLIENT_IP');
				$addrs[] = my_getenv('HTTP_PROXY_USER');
			}

			$addrs[] = my_getenv('REMOTE_ADDR');

			//-----------------------------------------
			// Do we have one yet?
			//-----------------------------------------

			foreach ( $addrs as $ip )
			{
				if ( $ip )
				{
					preg_match( "/^([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/", $ip, $match );

					self::instance()->ip_address = $match[1].'.'.$match[2].'.'.$match[3].'.'.$match[4];

					if ( self::instance()->ip_address AND self::instance()->ip_address != '...' )
					{
						break;
					}
				}
			}

			//-----------------------------------------
			// Make sure we take a valid IP address
			//-----------------------------------------

			if ( ( ! self::instance()->ip_address OR self::instance()->ip_address == '...' ) AND ! isset( $_SERVER['SHELL'] ) AND $_SERVER['SESSIONNAME'] != 'Console' )
			{
				print "Could not determine your IP address";
				exit();
			}

This code works well for IPv4 but for IPv6 is no go.

Also I've noticed that IPB stores ip adresses in mysql with type varchar(32) meaning even if that piece of code gets ipv6 capable there are other problems :/

 

[NewEraCracker]

Solution to workaround this problem:
Invision Power Board and IPv6, a dirty hack « MagicalTux in Japan

 

[Xman]

thanks NEC

 

[NewEraCracker]

I investigated this a bit and did this "mod":
-----------------------------------------

Upload a file with this contents named ipv6.php

<?php
/* IPv6 to IPv4, a dirty hack
 *
 * This will create fake IPv4 for IPv6 users based on the 64 first bits of their IP.
 * As most currently existing IPv6 providers are assigning /64 classes to their customers,
 * banning the generated IPv4 effectively bans the whole IPv6.
 *
 * Also this script generates a 32bits IPv4 from 64bits of IPv6 using XOR.
 * While this means people using IPv6 might share the same generated IPv4 (quite unlikely),
 * it is usually impossible for someone to obtain a different generated IPv4 without access
 * to more than a /64 (I believe only system administrators have this kind of thing).
 *
 * Author: NewEraCracker
 * License: Public Domain
 */

//@link: http://php.net/manual/en/function.inet-pton.php
if ( !function_exists('inet_pton')) {
	function inet_pton($ip){
		//ipv4
		if (strpos($ip, '.') !== FALSE) {
			$ip = trim($ip,':f');
			$ip = pack('N',ip2long($ip));
		}
		//ipv6
		elseif (strpos($ip, ':') !== FALSE) {

			//Short ipv6 fix by NewEraCracker
			$_count = count(explode(':', $ip));
			while($_count<8)
			{
				$ip = str_replace('::',':0::',$ip);
				$_count++;
			}
			unset($_count);
			//Newfags can't triforce!

			$ip = explode(':', $ip);
			$res = str_pad('', (4*(8-count($ip))), '0000', STR_PAD_LEFT);
			foreach ($ip as $seg) {
				$res .= str_pad($seg, 4, '0', STR_PAD_LEFT);
			}
			$ip = pack('H'.strlen($res), $res);
		}
		return $ip;
	}
}

//@link: http://php.net/manual/en/function.inet-ntop.php
if ( !function_exists('inet_ntop')){
	function inet_ntop($ip){
		if (strlen($ip)==4){
			//ipv4
			list(,$ip)=unpack('N',$ip);
			$ip=long2ip($ip);
		}
		elseif(strlen($ip)==16){
			//ipv6
			$ip=bin2hex($ip);
			$ip=substr(chunk_split($ip,4,':'),0,-1);
			$ip=explode(':',$ip);
			$res='';
			foreach($ip as $seg) {
				while($seg{0}=='0') $seg=substr($seg,1);
				if ($seg!='') {
					$res.=($res==''?'':':').$seg;
				} else {
					if (strpos($res,'::')===false) {
						if (substr($res,-1)==':') continue;
						$res.=':';
						continue;
					}
					$res.=($res==''?'':':').'0';
				}
			}
			$ip=$res;
		}
		return $ip;
	}
}

//@link: http://blog.magicaltux.net/2010/02/18/invision-power-board-and-ipv6-a-dirty-hack/
$encoded_ip = inet_pton($_SERVER['REMOTE_ADDR']);
if (strlen($encoded_ip) == 16) {
    $ipv4 = '';
    for($i = 0; $i < 8; $i += 2) $ipv4 .= chr(ord($encoded_ip[$i]) ^ ord($encoded_ip[$i+1]));
    $_SERVER['REMOTE_ADDR'] = inet_ntop($ipv4);
}

?>

conf_global.php
Look for:

define('IN_DEV', 0);

Add AFTER:

include_once('ipv6.php');