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PHP prevents websites from being attacked by banning frequent IP access

墨辰丷
墨辰丷 Original
2018-06-06 17:40:12 5239browse

This article mainly introduces PHP to prevent website from being attacked by prohibiting frequent IP access. Friends who are interested can refer to it. I hope it will be helpful to everyone.

If you find that a certain IP accesses the website too frequently, add it to the blacklist and prohibit access. This is not a good solution, but in an emergency, there is no better solution. It is just a stopgap measure. In the future, Let’s do some more in-depth research.

30){ @unlink($fileforbid); }else{ $fileforbidarr=@file($fileforbid); if($ip==substr($fileforbidarr[0],0,strlen($ip))){ if($time-substr($fileforbidarr[1],0,strlen($time))>120){ @unlink($fileforbid); }else if($fileforbidarr[2]>$allowRefresh){ file_put_contents($fileht,$ip."\r\n",FILE_APPEND); @unlink($fileforbid); }else{ $fileforbidarr[2]++; file_put_contents($fileforbid,$fileforbidarr); } } } } //防刷新 $str=''; $file=$logFilePath.'ipdate.dat'; if(!file_exists($logFilePath)&&!is_dir($logFilePath)){ mkdir($logFilePath,0777); } if(!file_exists($file)){ file_put_contents($file,''); } $uri=$_SERVER['REQUEST_URI'];//获取当前访问的网页文件地址 $checkip=md5($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."\r\n"; }else if($numtem<$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($logFilePath.'forbided_ip.log',$ip.'--'.date('Y-m-d H:i:s',time()).'--'.$uri."\r\n",FILE_APPEND); $timepass=$timetem+$allowtime-$time; exit('警告:不要刷新的太频繁!'); } } } } if($yesno){ $str.=$checkip.$checkuri.$time."\r\n"; } file_put_contents($file,$str);

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