奶牛最近发现有的网站为了阻止第7层网络的攻击，选择了使用cookie进行阻止恶意攻击。比如Voxility在防护启用的时候，就会用如下的方式：
<html>
<head><meta http-equiv="refresh" content="1" /><meta http-equiv="cache-control" content="max-age=0" /><meta http-equiv="cache-control" content="no-cache" /><met a http-equiv="expires" content="-1" /><meta http-equiv="expires" content="Tue, 0 1 Jan 1980 1:00:00 GMT" /><meta http-equiv="pragma" content="no-cache" /></head>
<script type="text/javascript">
<!--
function getCookie(w){
cName = "";
pCOOKIES = new Array();
pCOOKIES = document.cookie.split('; ');
for(bb = 0; bb < pCOOKIES.length; bb++){
NmeVal = new Array();
NmeVal = pCOOKIES[bb].split('=');
if(NmeVal[0] == w){
cName = unescape(NmeVal[1]);
}
}
return cName;
}
function printCookies(w){
cStr = "";
pCOOKIES = new Array();
pCOOKIES = document.cookie.split('; ');
for(bb = 0; bb < pCOOKIES.length; bb++){
NmeVal = new Array();
NmeVal = pCOOKIES[bb].split('=');
if(NmeVal[0]){
cStr += NmeVal[0] + '=' + unescape(NmeVal[1]) + '; ';
}
}
return cStr;
}
function setCookie(name, value, expires, path, domain, secure){
var vlad = name + "=" + escape(value);
if(expires){
expires = setExpiration(expires);
vlad += ";expires=" + expires;
}
if(path){
vlad += ";path=" + path;
}
if(domain){
vlad += ";domain=" + domain;
}
if(secure){
vlad += ';secure';
}
document.cookie = vlad;
}
function setExpiration(cookieLife){
var today = new Date();
var expr = new Date(today.getTime() + cookieLife * 24 * 60 * 60 * 1000);
return expr.toGMTString();
}
function delete_cookie(name){
document.cookie = name +'=; Path=/; Expires=Thu, 01 Jan 1970 00:00:01 GMT;';
}
// -->
</script>
<script type="text/javascript">
<!--
delete_cookie('hasVisitedSite');
setCookie('hasVisitedSite', 'Yes', '3', '/', '300', '');
delete_cookie('fb624561f4f8b25819e9b3c4fad70f85');
setCookie('fb624561f4f8b25819e9b3c4fad70f85', 'Yes', '3', '/', '300', '');
-->
</script><body></body></html>如果我们直接curl加网址的话得到的就是这种情况。如果我们想访问真实内容需要启用cookie。
curl -c cookie.txt www.nenew.net
curl -b cookie.txt www.nenew.net当第一次访问的时候，奶牛保存cookie信息在cookie.txt中，第二次访问包含cookie.txt中的信息，就可以访问到真实页面了。
