夜空

#!/bin/bash

#Collecting list of ip addresses connected to port 80

netstat -plan|grep :80|awk {'print $5'}|cut -d: -f 1|sort|uniq -c|sort -nk 1 > /root/iplist

#Limit the no of connections
LIMIT=100;

for ip in `cat /root/iplist |awk '{print $2}'`;do

if [ `grep $ip /root/iplist | awk '{print $1}'` -gt $LIMIT ]
then
echo "100 connection from $ip... `grep $ip /root/iplist | awk '{print $1}'` number of connections... Blocking $ip";

#Blocking the ip ...

/etc/rc.d/init.d/iptables save > /dev/null;
CHECK_IF_LOCALIP=0;
/sbin/ifconfig | grep $ip > /dev/null;
if [ $? -ne $CHECK_IF_LOCALIP ]
then
{
FLAG=0;
grep $ip /etc/sysconfig/iptables | grep DROP > /dev/null;
if [ $? -ne $FLAG ]
then
iptables -I INPUT -s $ip -j DROP;
else
echo " Ipaddress $ip is already blocked ";
fi
}
else
echo " Sorry, the ip $ip cannot be blocked since this is a local ip of the server ";
fi
fi
done

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标签: shell 脚本 攻击 ddos 封 防