anti_ddos.php

<?php
/*
Posted @ http://www.w3tools.info/2011/12/anti-ddos-php-script.html
*/
 function getIP () {
 if (getenv ("HTTP_CLIENT_IP") and preg_match ("/^[ 0-9 \ .]*?[ 0-9 \ .]+$/ is ", getenv (" HTTP_CLIENT_IP ")) and getenv (" HTTP_CLIENT_IP ") ! = '127 .0.0.1 ') {
 $ Ip = getenv ("HTTP_CLIENT_IP");
 } Elseif (getenv ("HTTP_X_FORWARDED_FOR") and preg_match ("/^[ 0-9 \ .]*?[ 0-9 \ .]+$/ is ", getenv (" HTTP_X_FORWARDED_FOR ")) and getenv (" HTTP_X_FORWARDED_FOR " !) = '127 .0.0.1 ') {
 $ Ip = getenv ("HTTP_X_FORWARDED_FOR");
 } Else {
 $ Ip = getenv ("REMOTE_ADDR");
 }
 return $ ip;
 }
 $ Ad_ip = getIP ();

 $ Ad_source = file ("{$ ad_dir} / {$ ad_black_file}");
 $ Ad_source = explode ('', $ ad_source [0]);
 if (in_array ($ ad_ip, $ ad_source)) {die ();}

 $ Ad_source = file ("{$ ad_dir} / {$ ad_white_file}");
 $ Ad_source = explode ('', $ ad_source [0]);
 if (! in_array ($ ad_ip, $ ad_source)) {

 $ Ad_source = file ("{$ ad_dir} / {$ ad_temp_file}");
 $ Ad_source = explode ('', $ ad_source [0]);
 if (! in_array ($ ad_ip, $ ad_source)) {
 $ Ad_file = fopen ("{$ ad_dir} / {$ ad_temp_file}", "a +");
 $ Ad_string = $ ad_ip. '  ';
 fputs ($ ad_file, "$ ad_string");
 fclose ($ ad_fp);
 ?>
<!--

 The site is currently subject to DDOS attack, if you're not a machine, zombie attacking the site, click on the button, otherwise your IP (<?=$ ad_ip?>) Will be blocked!
 <form method="post">
 <input type="submit" name="ad_white_ip" value="Knopka">
 </ Form>
-->

<?php
 die ();
 }
 elseif ($ _POST ['ad_white_ip']) {
 $ Ad_file = fopen ("{$ ad_dir} / {$ ad_white_file}", "a +");
 $ Ad_string = $ ad_ip. '  ';
 fputs ($ ad_file, "$ ad_string");
 fclose ($ ad_fp);
 }
 else {
 $ Ad_file = fopen ("{$ ad_dir} / {$ ad_black_file}", "a +");
 $ Ad_string = $ ad_ip. '  ';
 fputs ($ ad_file, "$ ad_string");
 fclose ($ ad_fp);
 die ();
 }
 }
 ?>