#!/bin/bash  
#script info:  
# Analysis access_log.abc log for a certain period of time to visit the suffix: "mp3",  
# and more than a certain number of requests an IP address, this IP address to iptables to filter to prevent the attack of CC.  
# by www.it.net.cn
#
cd /usr/local/apache/logs/  
  
tail access_log.abc -n 2000 | awk '{print $1,$7}'| grep -E 'mp3$' | awk '{print $1,$2}' | sort | uniq -c | sort -nr | grep -v -E '127.0' | awk '{if($2!=null && $1>50){print $2}}' > drop_ip.txt  
  
for i in `cat drop_ip.txt`  
do  
FLAG=0  
  for ai in `cat drop_ip_all.txt`  
    do  
      if [ "$i" = "$ai" ]; then  
        FLAG=1  
        break  
      fi  
  done  
  if [ $FLAG -eq 0 ]; then  
    #echo --new drop ip:$i  
    #add to iptables  
    /sbin/iptables -A INPUT -s $i -p tcp --dport 80 -j DROP  
  fi  
done  
  
#select drop_ip.txt append to drop_ip_all.txt  
cat drop_ip.txt >> drop_ip_all.txt  
  
#drop_ip_all remove repeat ip  
#cat drop_ip_all.txt | sort | uniq > drop_ip_all.txt