shell防ssh破解脚本

vim ssh_check.sh
#!/bin/bash
grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' /var/log/secure | sort | uniq -c|sort -rn   > /opt/zhanglei/ssh_connect_hack.txt
while read line
do
IP=`echo $line |awk  '{print $2}'`
NUM=`echo $line|awk  '{print $1}'`
if [ $NUM -gt 80  ]
then
grep $IP /etc/hosts.deny > /dev/null
if [ $? -ne 0 ]
then
echo "sshd:${IP} " >> /etc/hosts.deny
fi
fi
done</opt/zhanglei/ssh_connect_hack.txt