欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  php教程

PHP防CC攻击实现代码总结

程序员文章站 2024-02-20 17:17:58
...
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 复制代码

//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 - $_SESSION['last_time'] if($_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 复制代码

$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 - $ll_lasttime) if ($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 复制代码

/*
* 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 "";
//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 - $cc_lasttime) if ($cc_times>=$cc_min_nums){
if(!empty($cc_log)) cc_log(get_ip(), $real_ip, $cc_log, $cc_uri); //产生log
echo "Wait please, try again later!";
//printf('您的刷新过快,请稍后。');
//header("Location: ".$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。