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PHP - CC Attack Prevention
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| <?php | |
| $reqMethod = getenv('REQUEST_METHOD'); | |
| $reqIP = filter_var(getenv('HTTP_CLIENT_IP'), FILTER_VALIDATE_IP) ? getenv('HTTP_CLIENT_IP') : (filter_var(getenv('HTTP_X_FORWARDED_FOR'), FILTER_VALIDATE_IP) ? getenv('HTTP_X_FORWARDED_FOR') : getenv('REMOTE_ADDR')); | |
| $salt = "Only_U_Know_Me: {$reqIP} in ".round(time() / 604800, 0); | |
| $clientKey = md5($salt); | |
| $expires = gmdate("l, d-M-Y H:i:s T", time() + 604800); // 7 days | |
| if (strtoupper($reqMethod) == 'POST' /*&& EXCLUDE API URL REQUEST*/) { | |
| if (!isset($_COOKIE[$clientKey])){ | |
| exit(); | |
| } | |
| } | |
| if (strtoupper($reqMethod) == 'GET' && !preg_match('(Google|bing|Yahoo|Baidu|360|Sogou|facebookexternalhit)', getenv('HTTP_USER_AGENT'))) { | |
| if (!isset($_COOKIE[$clientKey])) { | |
| echo '<html><body> | |
| <script type = "text/javascript"> | |
| function getCookie(cname) { | |
| var name = " " + cname + "="; | |
| var ca = document.cookie.split(";"); | |
| for (var i = 0; i < ca.length; i++) { | |
| var c = ca[i]; | |
| //while (c.charAt(0) == " ") c = c.substring(1); | |
| if (c.indexOf(name) == 0) return c.substring(name.length, c.length); | |
| } | |
| return ""; | |
| } | |
| document.cookie = "'.$clientKey.'=hi; expires='.$expires.'"; | |
| if (getCookie("'.$clientKey.'") == "hi") { | |
| window.location.reload(); | |
| } | |
| </script></body></html>'; | |
| exit(); | |
| } | |
| } | |
| echo "{$reqMethod}, {$reqIP}, {$clientKey}"; | |
| ?> |
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