当前位置:站易网首页 > 建站教程 > 网站开发 > PHP教程 > php实现cc攻击防御和防止快速刷新页面示例

php实现cc攻击防御和防止快速刷新页面示例

文章TAG:
时间:2016-06-23来源:未知 作者:admin 文章热度:

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  

//代理IP直接退出 
empty($_SERVER['HTTP_VIA']) or exit('Access Denied'); 
//防止快速刷新 
session_start(); 
$seconds = '3'; //时间段[秒] 
$refresh = '5'; //刷新次数 
//设置监控变量 
$cur_time = time(); 
if(isset($_SESSION['last_time'])){ 
    $_SESSION['refresh_times'] += 1; 
}else{ 
    $_SESSION['refresh_times'] = 1; 
    $_SESSION['last_time'] = $cur_time; 

//处理监控结果 
if($cur_time - $_SESSION['last_time'] < $seconds){ 
    if($_SESSION['refresh_times'] >= $refresh){ 
        //跳转至攻击者服务器地址 
        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
/*
 * 防CC攻击郁闷到死,不死版。
 *
 * 如果每秒内网站刷新次数超过2次,延迟5秒后访问。
 */
 
$cc_min_nums = '1';                    //次,刷新次数
$cc_url_time = '5';                    //秒,延迟时间
//$cc_log = 'cc_log.txt';                //启用本行为记录日志
$cc_forward = 'http://localhost';    //释放到URL

//--------------------------------------------

//返回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;

//启用session
if( !isset( $_SESSION ) ) session_start();
$_SESSION["visiter"] = true;
if ($_SESSION["visiter"] <> true){
 echo "<script>setTimeout("window.location.href ='$cc_forward';", 1);</script>";
 //header("Location: ".$cc_forward);
 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;
}

//获取真实IP
if (isset($_SERVER)){
 $real_ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
}else{
 $real_ip = getenv("HTTP_X_FORWARDED_FOR");
}

//print_r($_SESSION);

//释放IP
if (($cc_nowtime - $cc_lasttime)<=0){
 if ($cc_times>=$cc_min_nums){        
 if(!empty($cc_log))    cc_log(get_ip(), $real_ip, $cc_log, $cc_uri);    //产生log
 echo "Wait please, try again later!<script>setTimeout("window.location.href ='$site_url';", 5000);</script>";
 //printf('您的刷新过快,请稍后。');
 //header("Location: ".$cc_forward);
 exit;
 }
}else{
 $cc_times = 0;
 $_SESSION['cc_lasttime'] = $cc_nowtime;
 $_SESSION['cc_times'] = $cc_times;
}

//记录cc日志
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);
}

//获取在线IP
function get_ip() {
 global $_C;
 
 if(empty($_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。

    相关PHP教程