Xin chỉ giúp cách chống DDOS (website đang bị DDOS)

session_start();
$URL_OF_FORUM = 'http://nhacthanh.net';
$TEN_COOKIE = 'nhacthanh_firewall';

if ( strstr($HTTP_SERVER_VARS['HTTP_USER_AGENT'] ,'Googlebot')||strstr($HTTP_SERVER_VARS['HTTP_USER_AGENT'] ,'msnbot')||strstr($HTTP_SERVER_VARS['HTTP_USER_AGENT'] ,'slurp')) 
{}
else{
if( file_exists($firewall) ){ require_once($firewall);} 
if((strpos($_SERVER['HTTP_REFERER'], $URL_OF_FORUM) !== 0) || (strpos($_SERVER['HTTP_REFERER'], $URL_OF_FORUM) !== 0) || (strpos($_SERVER['HTTP_REFERER'], $URL_OF_FORUM) !== 0) ) {    
if (empty($HTTP_SESSION_VARS['{$TEN_COOKIE}']))
{
    if (!empty($HTTP_POST_VARS['{$TEN_COOKIE}']))
    {
        session_register('{$TEN_COOKIE}');
        $HTTP_SESSION_VARS['{$TEN_COOKIE}']='myforum_protection';
        header("location: ".$_SERVER['REQUEST_URI']);
        exit();
    }

    $sform='<!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd>
<html xmlns=http://www.w3.org/1999/xhtml>
<head>
<meta http-equiv=Content-Type content=text/html; charset=utf-8 />
<meta name="keywords" content="Nhac Thanh Online" /> 
<meta name="description" content="Nhac Thanh Viet Nam" />
<title>Firewall forums Nhac Thanh Online</title>
<link href=dnp_style.php rel=stylesheet type=text/css />
<script language=JavaScript><!--
//Anti-right click for all broswers by Shacker © 2006
var message="";function clickIE() {if (document.all) {(message);return false;}}function clickNS(e) {if (document.layers||(document.getElementById&&!document.all)) {if (e.which==2||e.which==3) {(message);return false;}}}if (document.layers) {document.captureEvents(Event.MOUSEDOWN);document.onmousedown=clickNS;}else{document.onmouseup=clickNS;document.oncontextmenu=clickIE;document.onselectstart=clickIE}document.oncontextmenu=new Function("return false")
// -->
</script>
</head>
<body background="img/bg.gif">
<table border=0 height=600 width=100%>
<tr><td align=center valign=middle height="543">
<table width=600  class="table" align="center" border="0" cellpadding="0" cellspacing="0">
<tr><td height=25 width=29  class="tcat" colspan="0" align=center valign="middle"><img src="img/internet.gif"></td>
<td  class="tcat" colspan="0" align=left width=571><strong>Diễn đàn Nhạc Thánh đang được bảo vệ</strong></td>
</tr>
<tr><td colspan=2 height="28" id=Des align=center>
	<strong><font size="font-size: 15px">Nhấn nút <font color="#CC3300">Đăng nhập</font> để vào diễn đàn</font></strong></td>
<tr><td colspan=2 align=center bgcolor=#F7F7F7 class="vienall" style=filter:Alpha(Opacity:90);cursor:default>
	<table border="0" width="100%" id="table1" cellspacing="0" cellpadding="0" height="156">
		<tr>
			<td width="109">
			<img border="0" src="img/logo.gif" width="108" height="115" align="right"></td>
			<td>
			<p align="center"><strong><font size="6" color="#0000FF">Welcome </font> </strong>
			<p align="center"><b><font color="#660066" style="font-size: 42px">Nhạc Thánh Online</font></b></td>
			<td width="108">
			<img border="0" src="img/logo.gif" width="108" height="115" align="left"></td>
		</tr>
	</table>
	</td></tr>
<form name=sercform method=POST action='.$_SERVER['REQUEST_URI'].'>
<tr><td height=25 colspan=2 align=center class="tbottom">
<input type=submit value="Đăng nhập" size=6 style=cursor:pointer name=shfirewall class=button></td></tr></form>
</table></div></td></tr>
<tr><td align=right><a href="http://delynie.silveryhat.com" target=_blank>
	Silvery Hat Hacker</a> © 2007 DnP Community</td></tr>
<tr><td align=right height="25"><a href="img/direction.jpg" target="_blank"><b>Click ở đây nếu máy tính của bạn có dùng phần mềm Zone Alarm</b></s></td></tr>
</table>
</body></html>
';
    echo $sform;

    exit();
}
}
}

session_start(); $URL_OF_FORUM = '/w*\.?nhacthanh\.(net|com|biz|org)\/forum/'; $TEN_COOKIE = 'dnp_firewall'; if ( strstr($_SERVER["HTTP_USER_AGENT"] ,'Googlebot')||strstr($_SERVER["HTTP_USER_AGENT"] ,'msnbot')||strstr($_SERVER["HTTP_USER_AGENT"] ,'slurp')) {} else{ if(!ereg($URL_OF_FORUM,$_SERVER['HTTP_REFERER'])) { if (empty($_SESSION['{$TEN_COOKIE}'])) { if (!empty($_POST['{$TEN_COOKIE}'])) { session_register('{$TEN_COOKIE}'); $_SESSION['{$TEN_COOKIE}']='myforum_protection'; header("location: ".$_SERVER['REQUEST_URI']); exit(); } $sform='<ht ..............................

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