php--防止DDos攻击代码

 1 <?php
 2 //查询禁止IP
 3 $ip =$_SERVER[‘REMOTE_ADDR‘];
 4 $fileht=".htaccess2";
 5 if(!file_exists($fileht))file_put_contents($fileht,"");
 6 $filehtarr[email protected]file($fileht);
 7 if(in_array($ip."\r\n",$filehtarr))die("Warning:"."<br>"."Your IP address are forbided by some reason, IF you have any question Pls emill to [email protected]!");
 8
 9 //加入禁止IP
10 $time=time();
11 $fileforbid="log/forbidchk.dat";
12 if(file_exists($fileforbid))
13 { if($time-filemtime($fileforbid)>60)unlink($fileforbid);
14 else{
15     $fileforbidarr[email protected]file($fileforbid);
16     if($ip==substr($fileforbidarr[0],0,strlen($ip)))
17     {
18         if($time-substr($fileforbidarr[1],0,strlen($time))>600)unlink($fileforbid);
19         elseif($fileforbidarr[2]>600){file_put_contents($fileht,$ip."\r\n",FILE_APPEND);unlink($fileforbid);}
20         else{$fileforbidarr[2]++;file_put_contents($fileforbid,$fileforbidarr);}
21     }
22 }
23 }
24 //防刷新
25 $str="";
26 $file="log/ipdate.dat";
27 if(!file_exists("log")&&!is_dir("log"))mkdir("log",0777);
28 if(!file_exists($file))file_put_contents($file,"");
29 $allowTime = 120;//防刷新时间
30 $allowNum=10;//防刷新次数
31 $uri=$_SERVER[‘REQUEST_URI‘];
32 $checkip=md5($ip);
33 $checkuri=md5($uri);
34 $yesno=true;
35 $ipdate[email protected]file($file);
36 foreach($ipdate as $k=>$v)
37 { $iptem=substr($v,0,32);
38     $uritem=substr($v,32,32);
39     $timetem=substr($v,64,10);
40     $numtem=substr($v,74);
41     if($time-$timetem<$allowTime){
42         if($iptem!=$checkip)$str.=$v;
43         else{
44             $yesno=false;
45             if($uritem!=$checkuri)$str.=$iptem.$checkuri.$time."1\r\n";
46             elseif($numtem<$allowNum)$str.=$iptem.$uritem.$timetem.($numtem+1)."\r\n";
47             else
48             {
49                 if(!file_exists($fileforbid)){$addforbidarr=array($ip."\r\n",time()."\r\n",1);file_put_contents($fileforbid,$addforbidarr);}
50                 file_put_contents("log/forbided_ip.log",$ip."--".date("Y-m-d H:i:s",time())."--".$uri."\r\n",FILE_APPEND);
51                 $timepass=$timetem+$allowTime-$time;
52                 die("Warning:"."<br>"."Sorry,you are forbided by refreshing frequently too much, Pls wait for ".$timepass." seconds to continue!");
53             }
54         }
55     }
56 }
57 if($yesno) $str.=$checkip.$checkuri.$time."1\r\n";
58 file_put_contents($file,$str);
59 ?>