流量攻擊是一種比較初級的網(wǎng)站攻擊方法,就是不停的去刷樣網(wǎng)站,導(dǎo)致服務(wù)器處理不過來或數(shù)據(jù)庫負(fù)載不了,導(dǎo)致網(wǎng)站無法正常方法的一種攻擊手段了,下面我來介紹一個利用php防網(wǎng)站刷流量攻擊方法.
php網(wǎng)站防止刷流量攻擊方法實例代碼如下:
- <?php
- //查詢禁止IP
- $ip =$_SERVER['REMOTE_ADDR'];
- $fileht=".htaccess2";
- if(!file_exists($fileht))file_put_contents($fileht,"");
- $filehtarr=@file($fileht);
- if(in_array($ip."rn",$filehtarr))die("Warning:"."<br>"."Your IP address are forbided by some reason, IF you have any question Pls emill to shop@mydalle.com!");
- //加入禁止IP
- $time=time();
- $fileforbid="log/forbidchk.dat";
- if(file_exists($fileforbid))
- { if($time-filemtime($fileforbid)>60)unlink($fileforbid);
- else{
- $fileforbidarr=@file($fileforbid);
- if($ip==substr($fileforbidarr[0],0,strlen($ip)))
- {
- if($time-substr($fileforbidarr[1],0,strlen($time))>600)unlink($fileforbid);
- elseif($fileforbidarr[2]>600){file_put_contents($fileht,$ip."rn",FILE_APPEND);unlink($fileforbid);}
- else{$fileforbidarr[2]++;file_put_contents($fileforbid,$fileforbidarr);}
- }
- }
- }
- //防刷新
- $str="";
- $file="log/ipdate.dat";
- if(!file_exists("log")&&!is_dir("log"))mkdir("log",0777);
- if(!file_exists($file))file_put_contents($file,"");
- $allowTime = 120;//防刷新時間
- $allowNum=10;//防刷新次數(shù)
- $uri=$_SERVER['REQUEST_URI'];
- $checkip=md5($ip);
- $checkuri=md5($uri);
- $yesno=true;
- $ipdate=@file($file);
- foreach($ipdate as $k=>$v)
- { $iptem=substr($v,0,32);
- $uritem=substr($v,32,32);
- $timetem=substr($v,64,10);
- $numtem=substr($v,74);
- if($time-$timetem<$allowTime){
- if($iptem!=$checkip)$str.=$v;
- else{
- $yesno=false;
- if($uritem!=$checkuri)$str.=$iptem.$checkuri.$time."1rn";
- elseif($numtem<$allowNum)$str.=$iptem.$uritem.$timetem.($numtem+1)."rn";
- else
- {
- if(!file_exists($fileforbid)){$addforbidarr=array($ip."rn",time()."rn",1);file_put_contents($fileforbid,$addforbidarr);}
- file_put_contents("log/forbided_ip.log",$ip."--".date("Y-m-d H:i:s",time())."--".$uri."rn",FILE_APPEND);
- $timepass=$timetem+$allowTime-$time;
- die("Warning:"."<br>"."Sorry,you are forbided by refreshing frequently too much, Pls wait for ".$timepass." seconds to continue!");
- }//開源代碼Vevb.com
- }
- }
- }
- if($yesno) $str.=$checkip.$checkuri.$time."1rn";
- file_put_contents($file,$str);
- ?>
利用session 跟蹤防post提交,代碼如下:
- <?php
- session_start();
- $clean = array();
- $email_pattern = '/^[^@s<&>]+@([-a-z0-9]+.)+[a-z]{2,}$/i';
- if (preg_match($email_pattern, $_POST['email']))
- {
- $clean['email'] = $_POST['email'];
- $user = $_SESSION['user'];
- $new_password = md5(uniqid(rand(), TRUE));
- if ($_SESSION['verified'])
- {
- /* Update Password */
- mail($clean['email'], 'Your New Password', $new_password);
- }
- }
- ?>
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