对linux一窍不通 想知道这个是啥意思

lianwup

安装 CSF,然后这有一段：

然后用这个脚本，（我想知道这句话的意思，是直接在ssh客户端输入下面的这么多行代码吗？还是别的意思？）

#!/bin/bash
#Collecting list of ip addresses connected to port 80
netstat -plan|grep :80|awk {‘print $5′}|cut -d: -f 1|sort|uniq -c|sort -nk 1 >
/root/iplist
#Limit the no of connections
LIMIT=15;

for ip in `cat /root/iplist |awk ‘{print $2}’`;do

if [ `grep $ip /root/iplist | awk '{print $1}'` -gt $LIMIT ]
then
echo “15 connection from $ip… `grep $ip /root/iplist | awk ‘{print $1}’` number of connections… Blocking $ip”;

#Blocking the ip …

CHECK_IF_LOCALIP=0;
/sbin/ifconfig | grep $ip > /dev/null;
if [ $? -ne $CHECK_IF_LOCALIP ]
then {
FLAG=0;
grep $ip /etc/csf/csf.deny > /dev/null;
if [ $? -ne $FLAG ]
then
iptables -I INPUT -s $ip -j DROP;
echo “deny $ip;” >> /usr/local/nginx/conf/vhost/block.conf;
/usr/sbin/csf -d $ip;
~/lnmp reload;
else
echo ” Ipaddress $ip is already blocked “;
fi
}
else
echo ” Sorry, the ip $ip cannot be blocked since this is a local ip of the server “;
fi
fi
done

Zoplor

防CC？

★Extreme★

获取所有与你服务器链接的IP，连接数超过15的就通过iptables和nginx封禁。