运维经验 Linux 自动屏蔽超标访问IP的 bash 脚本

##############################################
#version="20100718"
#author="phpsir"
#author_email="phpsir@phpsir.com"
#QQ  733905
##############################################
maxnum=100
runmin_max=120
#runmin_max is run iptables -F timeout
banip_data_file="/root/banip_data.txt"
ipopenfile="/root/openip.txt"
ipfile="/tmp/80link.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 | sed "s/::ffff://g" | 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"`

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