Making IPB IPv6 capable

[NewEraCracker]

I investigated this a bit and did this "mod":
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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');