centos redhat系列对抗ddos之居家必备利器 banip.txt

##############################################
#version="20100718"
#author="phpsir"
#author_email="[e-mail]"
##############################################
maxnum=50
runmin_max=300
#runmin_max is clear time
ipfile="/tmp/80link.txt"
banip_data_file="/root/banip_data.txt"
ipopenfile="/root/openip.txt"
nsfile="/tmp/netstat80.txt"

myip=`/sbin/ifconfig eth0 | grep inet | awk '{print $2}' | sed 's/addr://' | grep .`
if [ ! -f $ipopenfile ]
then
echo "init $ipopenfile"
touch $ipopenfile
fi
if [ -f $banip_data_file ]
then
source $banip_data_file
echo "last runtime=$runtime"
else
echo "init $banip_data_file"
echo 'runtime='`date "+%s"` > $banip_data_file
source $banip_data_file
runmin_max=-1
fi

echo "start shell" `date "+%y-%m-%d %h:%m:%s"`
runmin=$((`date "+%s"`-$runtime))
if [ $runmin -gt $runmin_max ]
then
echo $runmin "is bigger than " $runmin_max
echo "clear ips"
/sbin/iptables -f
echo 'runtime='`date "+%s"` > $banip_data_file
else
echo $runmin "is lowwer than " $runmin_max
fi

netstat -an | grep "$myip:80" > $nsfile

echo "total links = " `cat $nsfile | wc -l `
echo "total links established = " `cat $nsfile | grep established | wc -l `
echo "total links sync = " `cat $nsfile | grep syn | wc -l `

cat $nsfile | awk '{print $5}' | awk -f: '{print $1}' | sort|uniq -c|sort -rn | head -n 10 > $ipfile

cat $ipfile | while read oneline
do
ip=`echo $oneline | cut -d " " -f 2`
num=`echo $oneline | cut -d " " -f 1`
str="$ip has linked $num "
banme="yes"

for allowip in `cat $ipopenfile`
do
echo $ip | grep $allowip > /dev/null
if [ $? -eq 0 ]
then
banme="no"
echo $allowip "banme = " $banme
/sbin/iptables -d input -p tcp -s $ip -d $myip --dport 80 -j reject > /dev/null 2>&1
continue
fi
done

if [ $banme = "yes" ]
then
if [ $num -gt "$maxnum" ]
then
/sbin/iptables -l -n | grep "$ip" >/dev/null
status=`echo $?`
if [ $status -eq 1 ]
then
echo "deny $ip ,because $str "
/sbin/iptables -a input -p tcp -s $ip -d $myip --dport 80 -j reject
echo "ban " $ip " ok "
#/sbin/iptables -l -n | grep "$ip"
else
echo > /dev/null
#echo "$str alread reject"
fi
else
echo > /dev/null
#echo "$str $ip ok ,less $maxnum "
fi
fi

done

echo "stop shell" `date "+%y-%m-%d %h:%m:%s"`