PHP防CC攻击实现代码总结
CC攻击就是对方利用程序或一些代理对您的网站进行不间断的访问,造成您的网站处理不了而处于当机状态,下面我们来总结一些防CC攻击的php实例代码,各位朋友可参考.
例1,代码如下:
-
- emptyempty($_SERVER['HTTP_VIA']) or exit('Access Denied');
-
- session_start();
- $seconds = '3';
- $refresh = '5';
-
- $cur_time = time();
- if(isset($_SESSION['last_time'])){
- $_SESSION['refresh_times'] += 1;
- }else{
- $_SESSION['refresh_times'] = 1;
- $_SESSION['last_time'] = $cur_time;
- }
-
- if($cur_time - $_SESSION['last_time'] < $seconds){
- if($_SESSION['refresh_times'] >= $refresh){
-
- header(sprintf('Location:%s', 'http://127.0.0.1'));
- exit('Access Denied');
- }
- }else{
- $_SESSION['refresh_times'] = 0;
- $_SESSION['last_time'] = $cur_time;
- }
例二,代码如下:
- $P_S_T = $t_array[0] + $t_array[1];
- $timestamp = time();
-
- session_start();
- $ll_nowtime = $timestamp ;
- if (session_is_registered('ll_lasttime')){
- $ll_lasttime = $_SESSION['ll_lasttime'];
- $ll_times = $_SESSION['ll_times'] + 1;
- $_SESSION['ll_times'] = $ll_times;
- }else{
- $ll_lasttime = $ll_nowtime;
- $ll_times = 1;
- $_SESSION['ll_times'] = $ll_times;
- $_SESSION['ll_lasttime'] = $ll_lasttime;
- }
- if (($ll_nowtime - $ll_lasttime)<3){
- if ($ll_times>=5){
- header(sprintf("Location: %s",'http://127.0.0.1'));
- exit;
- }
- }else{
- $ll_times = 0;
- $_SESSION['ll_lasttime'] = $ll_nowtime;
- $_SESSION['ll_times'] = $ll_times;
- }
一个实例我自己亲测的,日志分析:
- [2011-04-16 03:03:13] [client 61.217.192.39] /index.php
- [2011-04-16 03:03:13] [client 61.217.192.39] /index.php
- [2011-04-16 03:03:13] [client 61.217.192.39] /index.php
- [2011-04-16 03:03:13] [client 61.217.192.39] /index.php
- [2011-04-16 03:03:12] [client 61.217.192.39] /index.php
- [2011-04-16 03:03:12] [client 61.217.192.39] /index.php
- [2011-04-16 03:03:12] [client 61.217.192.39] /index.php
- [2011-04-16 03:03:11] [client 61.217.192.39] /index.php
- [2011-04-16 03:03:11] [client 61.217.192.39] /index.php
- [2011-04-16 03:03:11] [client 61.217.192.39] /index.php
- [2011-04-16 03:03:10] [client 61.217.192.39] /index.php
- [2011-04-16 03:03:10] [client 61.217.192.39] /index.php
下面是PHP方法,将以下代码另存为php文件,然后首行include入你的common.php文件中,代码如下:
- <?php
-
-
-
-
-
-
- $cc_min_nums = '1';
- $cc_url_time = '5';
-
- $cc_forward = 'http://localhost'; //释放到URL
-
-
-
-
- $cc_uri = $_SERVER['REQUEST_URI']?$_SERVER['REQUEST_URI']:($_SERVER['PHP_SELF']?$_SERVER['PHP_SELF']:$_SERVER['SCRIPT_NAME']);
- $site_url = 'http://'.$_SERVER ['HTTP_HOST'].$cc_uri;
-
-
- if( !isset( $_SESSION ) ) session_start();
- $_SESSION["visiter"] = true;
- if ($_SESSION["visiter"] <> true){
- echo "<script>setTimeout("window.location.href ='$cc_forward';", 1);</script>";
-
- exit;
- }
-
- $timestamp = time();
- $cc_nowtime = $timestamp ;
- if (session_is_registered('cc_lasttime')){
- $cc_lasttime = $_SESSION['cc_lasttime'];
- $cc_times = $_SESSION['cc_times'] + 1;
- $_SESSION['cc_times'] = $cc_times;
- }else{
- $cc_lasttime = $cc_nowtime;
- $cc_times = 1;
- $_SESSION['cc_times'] = $cc_times;
- $_SESSION['cc_lasttime'] = $cc_lasttime;
- }
-
-
- if (isset($_SERVER)){
- $real_ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
- }else{
- $real_ip = getenv("HTTP_X_FORWARDED_FOR");
- }
-
-
-
-
- if (($cc_nowtime - $cc_lasttime)<=0){
- if ($cc_times>=$cc_min_nums){
- if(!emptyempty($cc_log)) cc_log(get_ip(), $real_ip, $cc_log, $cc_uri);
- echo "Wait please, try again later!<script>setTimeout("window.location.href ='$site_url';", 5000);</script>";
-
-
- exit;
- }
- }else{
- $cc_times = 0;
- $_SESSION['cc_lasttime'] = $cc_nowtime;
- $_SESSION['cc_times'] = $cc_times;
- }
-
-
- function cc_log($client_ip, $real_ip, $cc_log, $cc_uri){
- $temp_time = date("Y-m-d H:i:s", time() + 3600*8);
-
- $temp_result = "[".$temp_time."] [client ".$client_ip."] ";
- if($real_ip) $temp_result .= " [real ".$real_ip."] ";
- $temp_result .= $cc_uri . "rn";
-
- $handle = fopen ("$cc_log", "rb");
- $oldcontent = fread($handle,filesize("$cc_log"));
- fclose($handle);
-
- $newcontent = $temp_result . $oldcontent;
- $fhandle=fopen("$cc_log", "wb");
- fwrite($fhandle,$newcontent,strlen($newcontent));
- fclose($fhandle);
- }
-
-
- function get_ip() {
- global $_C;
-
- if(emptyempty($_C['client_ip'])) {
- if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
- $client_ip = getenv('HTTP_CLIENT_IP');
- } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
- $client_ip = getenv('HTTP_X_FORWARDED_FOR');
- } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
- $client_ip = getenv('REMOTE_ADDR');
- } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
- $client_ip = $_SERVER['REMOTE_ADDR'];
- }
- $_C['client_ip'] = $client_ip ? $client_ip : 'unknown';
- }
- return $_C['client_ip'];
- }
- ?>
这样就可以基础工业防止了,但是如果更高级占的就没办法,大家可尝试使用相关硬件防火强来设置.