利用SHELL脚本自动拦截DDOS攻击

4gw

#!/bin/bash
#fix by leipore at 2014-12-18  ddos-autoprotection.sh
touch /root/back_bad_ip.txt
time=`date +"%Y-%m-%d %H:%M:%S"`
ar=`wc -l /root/back_bad_ip.txt |awk '{print $1}'`
sleep 1
netstat -an |grep 80 |grep -v "STREAM"|awk '{print $5 }'|sort | awk -F: '{print $1}'|uniq -c |awk '$1 > 200 {print $1,$2}' > /root/bad_ip;
cat /root/bad_ip |awk -vtime="$time" '{print time" | " $1" | "$2}' >>/root/back_bad_ip.txt
ar2=`wc -l /root/back_bad_ip.txt |awk '{print $1}'`
for i in `awk '{print $2}' /root/bad_ip`;do
if [ '$i' = " " ];then
exit :q
else
iptables -I INPUT -s $i -j DROP
fi
done
sum=$[$ar2 - $ar]
if [ "$sum" -eq 0 ];then
exit
else
/usr/lib/sendmail -f 189XXXXXXX@189.c-t 214999212@qq.com -s smtp.xx.cn -u "Subject:Report" -xu 1891XXXXXXX@189.cN-xp xxxxxx -m </root/back_bad_ip.txt
fi

#!/bin/bash while [ 1 ] do sh /scripts/ddos-autoprotection.sh sleep 30 done

nohup sh /scripts/ddos-check.sh &  (开机启动）




弊端 ：

• 重复iptables 禁用 。
  
• 不写入iptables日常，也就是说 重启失效
  
• 需要重启iptables（可选）
  
• 代理跟代理下端的链接超过此限制也会被限制  例如 lo网卡  本地网卡 等
  
• 
  

国安信仰

不错，学习了！