ddos PHP

php不用验证码如何防止ddos

小新
232
2020-12-16 14:19:45
栏目: 网络安全

php不用验证码如何防止ddos

php不用验证码防止ddos的示例:

1.在相关的php文件中,添加防止ddos攻击代码:

//查询禁止IP

$ip =$_SERVER['REMOTE_ADDR'];

$fileht=".htaccess2";

if(!file_exists($fileht))file_put_contents($fileht,"");

$filehtarr=@file($fileht);

if(in_array($ip."\r\n",$filehtarr))die("Warning:"."

"."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,$ip."\r\n",FILE_APPEND);unlink($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;//防刷新时间

$allowNum=10;//防刷新次数

$uri=$_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."1\r\n";

elseif($numtem<$allowNum)$str.=$iptem.$uritem.$timetem.($numtem+1)."\r\n";

else

{

if(!file_exists($fileforbid)){$addforbidarr=array($ip."\r\n",time()."\r\n",1);file_put_contents($fileforbid,$addforbidarr);}

file_put_contents("log/forbided_ip.log",$ip."--".date("Y-m-d H:i:s",time())."--".$uri."\r\n",FILE_APPEND);

$timepass=$timetem+$allowTime-$time;

die("Warning:"."

"."Sorry,you are forbided by refreshing frequently too much, Pls wait for ".$timepass." seconds to continue!");

}

}

}

}

if($yesno) $str.=$checkip.$checkuri.$time."1\r\n";

file_put_contents($file,$str);

?>

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