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基本原理:通过过滤ip_conntrack表得到ESTABLISHED状态过多的ip, 然后用iptabels封掉一段时间,同时用hping工具将这些ip从表中清理掉,最后将被封的ip和一些其他信息写到一个html页中,做简单的发布 默认功能:1, 当一个ip在ip_conntrack表中的ESTABLISHED状态在30-50之间时, 此ip被封10分钟,同时在ip_conntrack表中的记录被清除;50-100之间封15分钟,同时清表;100以上封30分钟,同时清表,2, 然后生成web页/var/www/html/wwy/drop/index.html --- 显示被封的ip, 和cpu状态等信息/var/www/html/wwy/all/index.html --- 每一个ip的连接情况3, 生成简单的日志/tmp/killip/tmp.log.txt使用方法:1, 需要安装hping2, 建议将脚本放到计划任务中3, 建议安装并开启apache, 为支持简单的web发布, 默认为 http://127.0.0.1/l/wwy/drop/index.htm4, 如果表的大小大于20mb请慎用 #!/bin/bash##---------------------------------------------------------------------------------------#Scrip name: killip, base on ip_conntrack, write by wwy.#--------------------------------------------------------------------------------------- cpu=`sar -u 1 1 | awk '{print $7}' | tail -1`%#while [ "`pidof sleep`" ];do echo "she is running, sorry" exit 1doneif [ ! "`lsmod | grep ip_conntrack`" ]; then modprobe ip_conntrackfi ######################################---------------------- functions -----------------------------###################################### function make_clr { while read clr33;do cat /tmp/tmp111.txt | grep $clr33 >> /tmp/tmp33-3-clr.txt done < /tmp/tmp33-3.txt while read clr22;do cat /tmp/tmp111.txt | grep $clr22 >> /tmp/tmp33-2-clr.txt done < /tmp/tmp33-2.txt while read clr11;do cat /tmp/tmp111.txt | grep $clr11 >> /tmp/tmp33-1-clr.txt done < /tmp/tmp33-1.txt}function clr_conns { S_IP=$1 D_IP=$2 S_PORT=$3 D_PORT=$4 hping2 $D_IP -R -s $S_PORT -p $D_PORT -a $S_IP -k -c 1 >/dev/null 2>/dev/null &}function kill() { SLEEP_TIME=$1 CLR_LIST=$2 BLACK_LIST=$3 while read blackip;do iptables -I FORWARD 2 -i eth0 -s $blackip/32 -j DROP done < $BLACK_LIST sleep $SLEEP_TIME #-----------------------------------# while read clr3;do clr_conns $clr3 done < $CLR_LIST #-----------------------------------# sleep 1 while read reblackip;do iptables -D FORWARD -i eth0 -s $reblackip/32 -j DROP done < $BLACK_LIST }#######################################--------------- To make a "black list" ----------------------####################################### echo > /tmp/tmp11.txtecho > /tmp/tmp111.txtecho > /tmp/ip_conntrack.tmpecho > /tmp/tmp33-3-clr.txtecho > /tmp/tmp33-2-clr.txtecho > /tmp/tmp33-1-clr.txtecho > /tmp/tmp22-3.txtecho > /tmp/tmp22-2.txtecho > /tmp/tmp22-1.txtecho > /tmp/tmp33-3.txtecho > /tmp/tmp33-2.txtecho > /tmp/tmp33-1.txtif [ ! -e /var/www/html/wwy/index.html ];then mkdir /var/www/html/wwy/ mkdir /var/www/html/wwy/all mkdir /var/www/html/wwy/drop5B touch /var/www/html/wwy/index.htmlfi#----------------------------------------------------------------------------#echo -e "cp /proc/net/ip_conntrack /tmp/ip_conntrack.tmp ......\c"cp /proc/net/ip_conntrack /tmp/ip_conntrack.tmpecho -e "done!\n"sleep 1#----------------------------------------------------------------------------#wc=`cat /tmp/ip_conntrack.tmp|grep ESTABLISHED|awk -F= '{print $2,$3,$4,$5}'|grep ^172. |sort|awk '{print $1,$3,$5,$7}'|tee /tmp/tmp111.txt|awk '{print $1}'|uniq -c|tee /tmp/tmp11.txt|wc -l`date=`date '+%m/%d %H:%M'`cpu2=`sar -u 1 1 | awk '{print $7}' | tail -1`%date2=`date '+%H'`#----------------------------------------------------------------------------#sleep 1#----------------------------------------------------------------------------##if [ "$wc" -gt 2500 ] && [ "$date2" -gt 10 ]if [ "$wc" -ge 0 ]then#------------------------------ awk '{$1}{if ($1>30 && $1<50) print $2}' /tmp/tmp11.txt > /tmp/tmp22-1.txt awk '{$1}{if ($1>=50 && $1<100) print $2}' /tmp/tmp11.txt > /tmp/tmp22-2.txt awk '{$1}{if ($1>=100) print $2}' /tmp/tmp11.txt > /tmp/tmp22-3.txt cut -c1-15 /tmp/tmp22-1.txt > /tmp/tmp33-1.txt cut -c1-15 /tmp/tmp22-2.txt > /tmp/tmp33-2.txt cut -c1-15 /tmp/tmp22-3.txt > /tmp/tmp33-3.txt wcblackip1=`cat /tmp/tmp33-1.txt | wc -l` wcblackip2=`cat /tmp/tmp33-2.txt | wc -l` wcblackip3=`cat /tmp/tmp33-3.txt | wc -l` ########################################---------------- To make a index.html -----------------------######################################## echo "<b>If the total IPs >2500 <font color=\"#ff0000\">(total $wc at $date)</font> AND if:</b>" > /var/www/html/wwy/drop/index.html echo "<p>you connect <b>\">100\"</b>, you ip will be killed in <b>30min</b>.</p>" >>/var/www/html/wwy/drop/index.html echo "<p>you connect <b>\"50-100\"</b>, you ip will be killed in <b>15min</b>.</p>" >>/var/www/html/wwy/drop/index.html echo "<p>you connect <b>\"30-50\"</b>, you ip will be killed in <b>10min</b>.</p>" >>/var/www/html/wwy/drop/index.html echo "<hr color=\"#ff8000\">" >> /var/www/html/wwy/drop/index.html echo "<p><b><font color=\"#ff0000\">These IPs (total $wcblackip3 + $wcblackip2 + $wcblackip1) were killed, at <font size=5>$date</font></font> <a href=../all>(look-up all IPs)</a></b></p>" >> /var/www/html/wwy/drop/index.html awk '{$1}{if ($1>=100) print $1, $2}' /tmp/tmp11.txt|sort -nr|awk '{print "<p>""<font color=\"#ff0000\">"$1"</font>""\t","<b>"$2"</b>""\t""kill 30min""</p>"}' >> /var/www/html/wwy/drop/index.html awk '{$1}{if ($1>=50 && $1<100) print $1, $2}' /tmp/tmp11.txt|sort -nr|awk '{print "<p>"$1"\t","<b>"$2"</b>""\t""kill 15min""</p>"}' >> /var/www/html/wwy/drop/index.html awk '{$1}{if ($1>30 && $1<50) print $1, $2}' /tmp/tmp11.txt|sort -nr|awk '{print "<p>"$1"\t","<b>"$2"</b>""\t""kill 10min""</p>"}' >> /var/www/html/wwy/drop/index.html echo "<p><b>You can \"ctrl + F\" to find your ip's connects.(total $wc IPs at $date)</b></p>" > /var/www/html/wwy/all/index.html echo "<p><a href=../drop> <-- back </a></p>" >> /var/www/html/wwy/all/index.html cat /tmp/tmp11.txt | sort -nr | awk '{print "<p>"$1"\t",$2"\t""</p>"}' >> /var/www/html/wwy/all/index.html #######################################----------------- Use iptables to DROP ---------------------####################################### make_clr if [ -s /tmp/tmp33-3.txt ];then kill 30m /tmp/tmp33-3-clr.txt /tmp/tmp33-3.txt & sleep 1s fi if [ -s /tmp/tmp33-2.txt ];then kill 15m /tmp/tmp33-2-clr.txt /tmp/tmp33-2.txt & sleep 1s fi if [ -s /tmp/tmp33-1.txt ];then kill 10m /tmp/tmp33-1-clr.txt /tmp/tmp33-1.txt & sleep 1s fi #-------------------------------elif [ "$date2" -lt 5 ] && [ "$date2" -gt 3 ]then while read clrall;do clr_conns $clrall done < /tmp/tmp111.txt echo "clr at $date " >> /tmp/killip/tmp.log.txtfi #######################################------------------- make system log ------------------------#######################################if [ ! -e /tmp/killip/tmp.log.txt ]; then mkdir /tmp/killip touch /tmp/killip/tmp.log.txtfiecho "$wc $date $cpu $cpu2 $wcblackip3 + $wcblackip2 + $wcblackip1" >> /tmp/killip/tmp.log.txt |
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