Analysis of PHP programs to prevent ddos, dns, and cluster server attacks

This article provides a detailed analysis of solutions for PHP programs to prevent ddos, dns, and cluster server attacks. For more information, see

This article provides a detailed analysis of solutions for PHP programs to prevent ddos, dns, and cluster server attacks. For more information, see

Speaking of nonsense, Hong Kong virtual hosts, server space, and code

The Code is as follows:

// Query the forbidden IP Address
$ 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! ");
// Add a prohibited IP Address
$ 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 );
}
}
}
}
// Anti-Refresh
$ 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; // anti-Refresh time
$ AllowNum = 10; // number of anti-Refresh attempts
$ 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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