ANTI DDOS SCRIPT FOR WEBSITES.

THIS IS SEARCHED FROM GOOGLE.


Put it on your header

 <

//----------------------------------------// KS AntiDDOS ver. 4.0// (C) Cosinus,Klavasoft.com// ----------------------------------------


class ksantiddos{var $seconds_limit, $hits_limit, $memlen;var $status, $error_msg, $now;var $visitor; // status of visitor = raw|cool|warm|hotvar $warm_level; // number of hits for last $seconds_limit seconds that cause visitor`s status turn to warmvar $iplist_var = 1; // number of variable in the shared memoryvar $auto = true; // block visitors by KS AntiDDOSvar $delay = 30; // seconds of delay of blocked visitorsvar $block_cnet = true; // block all C class net.function doit($hits_limit,$seconds_limit,$memlen=300000){if (!function_exists('shm_attach')) return $this->alles(false);$this->seconds_limit = $seconds_limit;$this->hits_limit = $hits_limit;$this->memlen = $memlen;$this->visitor = 'raw';if (empty($this->warm_level))$this->warm_level = ceil($this->hits_limit/2);$this->now = time();// reading list of IPsif (false===$this->read_iplist()) return $this->alles(false);$this->clean_list();// adding current hit$ip = $_SERVER['REMOTE_ADDR'];if ($this->block_cnet) $ip = substr($ip,0,strrpos($ip,'.')+1);if (@!is_array($this->iplist[$ip])) $this->iplist[$ip] = array();$this->iplist[$ip][] = $this->now;// saving IP listif (false===$this->save_iplist()) return $this->alles(false);$count = count($this->iplist[$ip]);$this->status = 'ok';if ($count==1) // if only current hot in the list for the IP$this->visitor = "new";elseif ($count>$this->hits_limit)$this->visitor = "hot";elseif ($count>=$this->warm_level)$this->visitor = "warm";else$this->visitor = "cool";return $this->alles(true);}// cleaning IP listfunction clean_list(){foreach($this->iplist as $ip=>$times){$times_count = count($times);// looking for ther first hit to leave in the list$actual_ptr = -1;for($i=0; $iseconds_limit>$this->now){ // found$actual_ptr = $i;break;}}if ($actual_ptr==-1) // clean IP{unset($this->iplist[$ip]);continue;}else{$actual_ptr = max($actual_ptr,$times_count-$this->hits_limit);$this->iplist[$ip] = array_slice($times,$actual_ptr);}}}


function read_iplist(){// attaching to shared memory$shm_token = ftok(__FILE__,' ');$this->shm_id = shm_attach($shm_token,$this->memlen,0766);if (false===$this->shm_id){$this->status = 'error';$this->error_msg = 'cannot attach shared memory. ';return false;}$this->iplist = @shm_get_var($this->shm_id,$this->iplist_var);if (false===$this->iplist){ // creating variable in the shared memory$this->iplist = array();$res = @shm_put_var($this->shm_id,$this->iplist_var,$this->iplist);if (false===$res){$this->status = 'error';$this->error_msg = 'cannot create shared iplist. ';return false;}}return true;}function save_iplist(){$res = true;if (false===shm_put_var($this->shm_id,$this->iplist_var,$this->iplist)) $res = false;return $res;}function getmicrotime(){list($usec, $sec) = explode(" ", microtime());return ((float)$usec + (float)$sec);}function alles($res=true){if (!empty($this->shm_id)){if (false===@shm_detach($this->shm_id))$this->error_msg .= '; error detaching shared memory. ';}if (!empty($this->error_msg) ){$this->status = 'error';$res = false;}if ($this->auto && $this->visitor=='hot'){header('HTTP/1.0 503 Service Unavailable');header('Status: 503 Service Unavailable');header("Retry-After: $this->delay");print "
Our server is currently overloaded, your request will be repeated automatically in $this->delay seconds
";die();}return $res;}}if (strrchr($_SERVER['SCRIPT_NAME'],'/')==='/ksantiddos.php'){ // direct request form browserif (isset($_GET['test'])){ // testing system requirementif (!function_exists('shm_attach'))die("
Function shm_attach does not exist - KS AntiDDOS would not work");$shm_token = ftok(__FILE__,' ');$shm_id = @shm_attach($shm_token,1000,0766);@shm_detach($shm_token);if (false===$shm_id){die("
Function shm_attach does not work - KS AntiDDOS would not work");}die("
It looks like KS AntiDDOS will work propertly");}print "
ksantiddos control pannel
";$delete_shm = @$_GET['delete'];$shm_token = ftok(__FILE__,' ');if ($delete_shm){print "Deleting shared memory... ";$shm_id = shm_attach($shm_token);$res = shm_remove($shm_id);if ($res)print "Successful";elseprint "Failed";}$shm_token_hex = dechex($shm_token);print "
my shared memory blocks";$shms = `ipcs -m`;$shms = explode("\n",$shms);$header = preg_grep('~key~i',$shms);$header = array_values($header);$header = $header[0];$myshms = preg_grep("~$shm_token_hex~",$shms);$anyway = '';if (empty($myshms)){print "
not found";$anyway = 'anyway';}$header = preg_split('/[\s\t]+/',$header);$header = ' '.implode(' ',$header);$header = str_replace(' ','',$header);print "$header\n";$myshms = array_values($myshms);foreach($myshms as $num=>$line){$line = preg_split('/[\s\t]+/',$line);$shm_id = $line[1];$line = ' '.implode(' ',$line);$line = str_replace(' ','',$line);print "$line\n";}print "delete it $anyway";$ksa = new ksantiddos();$ksa->auto = false;$ksa->doit(1000,1000);$res = $ksa->read_iplist();if (!$res)print "
Cannot read IP list: ".$ksa->error_msg;else{$count_ips = count($ksa->iplist);print "\n

total $count_ips stored IPs";print "\n";foreach($ksa->iplist as $ip=>$times){print "\n$ip".count($times)." hits";}print "\n";print "Please note that I store no more then hits_limit hits";}$ksa->alles();}


?>