系统介绍

随着互联网的发展，网站安全问题越来越受到人们的关注。其中，CC攻击是一种常见的攻击方式，可以通过大量的请求来使网站瘫痪。为了保障网站的安全性，我们可以为网站添加一个简单的CC防御系统。本文将介绍如何添加这个脚本，并探讨其实现原理

代码实现

1.首先在根目录建个 cc.php 文件代码如下：

<?php
define('SYSTEM_ROOT', dirname(preg_replace('@\\(.*\\(.*$@', '', preg_replace('@\\(.*\\(.*$@', '', __FILE__))) . '/');
session_start();
date_default_timezone_set('Asia/Shanghai');
header('Content-Type: text/html; charset=UTF-8');
function getspider($useragent=''){ if(CC_Defender==2)return false; 
if(!$useragent){$useragent = $_SERVER['HTTP_USER_AGENT'];}$useragent=strtolower($useragent); 
if (strpos($useragent, 'baiduspider') !== false){return 'baiduspider';} 
if (strpos($useragent, 'googlebot') !== false){return 'googlebot';} 
if (strpos($useragent, 'soso') !== false){return 'soso';} 
if (strpos($useragent, 'bing') !== false){return 'bing';} 
if (strpos($useragent, 'yahoo') !== false){return 'yahoo';} 
if (strpos($useragent, 'sohu-search') !== false){return 'Sohubot';} 
if (strpos($useragent, 'sogou') !== false){return 'sogou';} 
if (strpos($useragent, 'youdaobot') !== false){return 'YoudaoBot';} 
if (strpos($useragent, 'yodaobot') !== false){return 'YodaoBot';} 
if (strpos($useragent, 'robozilla') !== false){return 'Robozilla';} 
if (strpos($useragent, 'msnbot') !== false){return 'msnbot';} 
if (strpos($useragent, 'lycos') !== false){return 'Lycos';} 
if (strpos($useragent, 'ia_archiver') !== false || strpos($useragent, 'iaarchiver') !== false){return 'alexa';}
 if (strpos($useragent, 'archive.org_bot') !== false){return 'Archive';} 
 if (strpos($useragent, 'robozilla') !== false){return 'Robozilla';} 
 if (strpos($useragent, 'sitebot') !== false){return 'SiteBot';} 
 if (strpos($useragent, 'mj12bot') !== false){return 'MJ12bot';} 
 if (strpos($useragent, 'gosospider') !== false){return 'gosospider';} 
 if (strpos($useragent, 'gigabot') !== false){return 'Gigabot';} 
 if (strpos($useragent, 'yrspider') !== false){return 'YRSpider';} 
 if (strpos($useragent, 'gigabot') !== false){return 'Gigabot';} 
 if (strpos($useragent, 'jikespider') !== false){return 'jikespider';} 
 if (strpos($useragent, 'addsugarspiderbot') !== false){return 'AddSugarSpiderBot';/*非常少*/} 
 if (strpos($useragent, 'testspider') !== false){return 'TestSpider';} 
 if (strpos($useragent, 'etaospider') !== false){return 'EtaoSpider';} 
 if (strpos($useragent, 'wangidspider') !== false){return 'WangIDSpider';} 
 if (strpos($useragent, 'foxspider') !== false){return 'FoxSpider';} 
 if (strpos($useragent, 'docomo') !== false){return 'DoCoMo';} 
 if (strpos($useragent, 'yandexbot') !== false){return 'YandexBot';} 
 if (strpos($useragent, 'ezooms') !== false){return 'Ezooms';/*个人*/} 
 if (strpos($useragent, 'sinaweibobot') !== false){return 'SinaWeiboBot';} 
 if (strpos($useragent, 'catchbot') !== false){return 'CatchBot';} 
 if (strpos($useragent, 'surveybot') !== false){return 'SurveyBot';} 
 if (strpos($useragent, 'dotbot') !== false){return 'DotBot';} 
 if (strpos($useragent, 'purebot') !== false){return 'Purebot';} 
 if (strpos($useragent, 'ccbot') !== false){return 'CCBot';} 
 if (strpos($useragent, 'mlbot') !== false){return 'MLBot';} 
 if (strpos($useragent, 'adsbot-google') !== false){return 'AdsBot-Google';} 
 if (strpos($useragent, 'ahrefsbot') !== false){return 'AhrefsBot';} 
 if (strpos($useragent, 'spbot') !== false){return 'spbot';} 
 if (strpos($useragent, 'augustbot') !== false){return 'AugustBot';} return false; } 
 if($_GET['rand'] && $_SESSION['rand_session']!=$_GET['rand']){ @header('Content-Type: text/html; charset=UTF-8'); 
 exit('<b>浏览器不支持 COOKIE 或者不正常访问！</b>'); } 
 if(!$_SESSION['rand_session'] && $nosecu!=true){ if(!getspider()){ $rand_session=md5(uniqid().rand(1,1000)); $_SESSION['rand_session']=$rand_session; 
 exit("<!DOCTYPE HTML>
 <html> 
 <head> 
 <meta charset=\"UTF-8\"/> 
 <meta name=\"viewport\" content=\"width=device-width, initial-scale=1, maximum-scale=1\" /> 
 <title>安全检查中...</title> 
 <script> 
 var i = 5; 
 var intervalid; 
 intervalid = setInterval(\"fun()\", 1000);
 function fun() {if (i == 0) {window.location.href = \"?{$_SERVER['QUERY_STRING']}&rand={$rand_session}\";clearInterval(intervalid);}
 document.getElementById(\"mes\").innerHTML = i;i--;}
 </script>
 <style> 
 html, body {
	 width: 100%; 
	 height: 100%; 
	 margin: 0; 
	 padding: 0;
	 } 
	 body {
		 background-color: 
		 #ffffff; 
		 font-family: Helvetica, Arial, sans-serif; f
		 ont-size: 100%;
		 } 
		 h1 {
			 font-size: 1.5em; 
			 color: #404040; 
			 text-align: center;
			 }
			 p {
				 font-size: 1em; 
				 color: #404040; 
				 text-align: center; 
				 margin: 10px 0 0 0;
				 } 
				 #spinner {
					 margin: 0 auto 30px auto; 
					 display: block;
					 } 
					 .attribution {
						 margin-top: 20px;
						 } 
						 </style> 
						 </head>
						 <body> 
						 <table width=\"100%\" height=\"100%\" cellpadding=\"20\"> 
						 <tr>
						 <td align=\"center\" valign=\"middle\"> 
						 <noscript>
						 <h2>请打开浏览器的 javascript，然后刷新浏览器</h2>
						 </noscript> 
						 <h1><span data-translate=\"checking_browser\">浏览器安全检查中...</span></h1> 
						 <p data-translate=\"process_is_automatic\"></p>
						 <p data-translate=\"allow_5_secs\">还剩 <span id=\"mes\">5</span> 秒</p> 
						 </div>
						 </div> 
						 </td> 
						 </tr>
						 </table>
						 </body>
						 </html>
						 ");
						 }
						 }

2.调用代码 PHP 通用调用，在头部或主要文件内文件加入：

<?php include 'cc.php'; ?>

实现原理

CC防御脚本的实现原理是利用了五秒盾的原理。具体来说，当访问者第一次访问网站时，脚本会检测浏览器是否支持COOKIE，并将COOKIE存储在$_COOKIE['check_cc']中。如果浏览器支持COOKIE，则可以正常访问网站。否则，将会显示一个提示页面，并倒计时5秒后跳转到其他页面。同时，该脚本还会过滤掉搜索引擎蜘蛛，不会影响搜索引擎的收录

本文作者为祝兜兜，转载请注明。