Created
August 5, 2012 21:42
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Litle DDoS hack :-)
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| <?PHP | |
| if((!isset($_COOKIE) || !isset($_GET['r'])) || $_GET['r'] != $_COOKIE['r']){ | |
| $rnd = md5(mt_rand()); | |
| if($_SERVER['QUERY_STRING'] && !$_GET['r']){ | |
| $s = '?' . $_SERVER['QUERY_STRING'] . '&r='.$rnd; | |
| }else{ | |
| $s = '?r='.$rnd; | |
| }; | |
| $request = "http://" . $_SERVER['HTTP_HOST'] . "/" . $_SERVER['PHP_SELF'] . $s; | |
| die('<html><head><script type="text/javascript"> | |
| function setCookie (name, value, expires, path, domain, secure) { | |
| document.cookie = name + "=" + escape(value) + | |
| ((expires) ? "; expires=" + expires : "") + | |
| ((path) ? "; path=" + path : "") + | |
| ((domain) ? "; domain=" + domain : "") + | |
| ((secure) ? "; secure" : ""); | |
| }; | |
| var d = new Date(); | |
| d.setHours(d.getHours() + 1); | |
| setCookie("r", "'.$rnd.'", d, "/"); | |
| document.location.href="'.$request.'" | |
| </script></head><body></body></html>'); | |
| }; |
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Скрипт пишет при помощи JS куку, с рандомным MD5-хешем, затем перебрасывает клиента опять на тот же самый, запрошенный им ранее адрес, с теми же параметрами + тот самый хеш, и проверяет его, в случае несовпадения или отсутствия куки делает die().
Помогает от небольших атак DDOS-ботов.