linux中使用shell指令碼配置iptables防火牆

 要放假了,今天實在是閑得蛋疼,本來只想寫個配置iptables的指令碼的,沒想到被自己搞得這麼複雜了,還是分享出來給大家,有興趣的可以自己再改改.
  ps:本指令碼只支援centos5和centos6,不支援centos 7,並且在指令碼裡也限制了.
指令碼內容:

#!/bin/sh
# By rocdk890
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin
export PATH

#Begin
start(){
    sshport=`netstat -ntlp|grep sshd |awk -F: '{if($4!="")print $4}'`
   
    # Require root to run this script.
    echo "  check user......"
    if [[ $(whoami) != root ]];then
      echo "Please run this script as root !"
      exit 1
    fi
    echo "  check lsb_release....."
    chlsb=`rpm -qa|grep redhat-lsb|wc -l`
    if [ $chlsb -ge 1 ];then
    echo "  has installed redhat-lsb."
    else
    echo "  no found. install redhat-lsb......"
    yum -y install redhat-lsb
    fi
    #===============================================================================
    #this script is only for CentOS 5 and CentOS 6
    #check the OS
    #===============================================================================
    version=`lsb_release -r |awk '{print substr($2,1,1)}'`
    if [ $version != 5 ] || [ $version != 6 ];then
    echo "the platform is ok !"
    else
    echo "this script is only for CentOS 5 or CentOS 6 !"
    exit 1
    fi

    #iptables setting
    echo "Iptables Setting..."
    /sbin/iptables -P INPUT ACCEPT
    #清空所有規則
    /sbin/iptables -F
    /sbin/iptables -X
    /sbin/iptables -Z
    /sbin/iptables -F -t nat
    /sbin/iptables -X -t nat
    /sbin/iptables -Z -t nat
    /sbin/iptables -X -t mangle
    #允許來自於lo介面的資料包，通過127.0.0.1訪問本地服務
    /sbin/iptables -A INPUT -i lo -j ACCEPT
    #允許dns和ntp的資料通過
    /sbin/iptables -A INPUT -p udp -m udp --sport 53 -j ACCEPT
    /sbin/iptables -A INPUT -p udp -m udp --sport 123 -j ACCEPT
    #限制對內部封包的發送速度
    /sbin/iptables -A INPUT -f -m limit --limit 100/sec --limit-burst 100 -j ACCEPT
    /sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -m limit --limit 20/sec --limit-burst 200 -j ACCEPT
    #/sbin/iptables -A INPUT -p icmp -m limit --limit 12/min --limit-burst 5 -j DROP
    #限制建立聯機的轉寄速度
    /sbin/iptables -A FORWARD -f -m limit --limit 100/sec --limit-burst 100 -j ACCEPT
    /sbin/iptables -A FORWARD -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -m limit --limit 20/sec --limit-burst 200 -j ACCEPT
    #開放ssh連接埠
    /sbin/iptables -A INPUT -p tcp --dport $sshport -j ACCEPT
    #開放web服務預設連接埠80
    /sbin/iptables -A INPUT -p tcp --dport 80 -j ACCEPT
    #開放https服務預設連接埠443
    #/sbin/iptables -A INPUT -p tcp --dport 443 -j ACCEPT
    #開放指定ip，指定連接埠
    #/sbin/iptables -A INPUT -p tcp -s 100.240.143.33 --dport 8080 -j ACCEPT
    #允許ping
    /sbin/iptables -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT
    #允許TCP建立串連，接受成功狀態握手
    /sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
    /sbin/iptables -A INPUT -m state --state INVALID,NEW -j DROP
    #屏蔽規則外請求
    /sbin/iptables -P INPUT DROP
    /sbin/iptables -P FORWARD DROP

    BADIPS="`curl -s http://feeds.dshield.org/block.txt | awk '/^[1-9]/ {print $1 "/" $3}'`"
    if [ "$BADIPS" ];then
        for ip in $BADIPS
        do
            iptables -I INPUT -s $ip -j DROP
        done
    fi
}

stop(){
    echo "Cleaning your Iptables:..."
    iptables -F
    iptables -X
    iptables -Z
    iptables -P INPUT ACCEPT
    iptables -P OUTPUT ACCEPT
    /etc/init.d/iptables stop
    if [ "$?" == "0" ];then
        echo "Done!"
    fi
}

save(){
 echo "Save your Iptables:..."
 /etc/init.d/iptables save
 /etc/init.d/iptables restart
}

case "$1" in
start)
    start
    ;;
stop)
    stop
    ;;
restart)
    stop && start
    ;;
save)
    start && save
    ;;
*)
    echo $"Usage: $0 {start|stop|restart|save}"
    exit 1
esac
exit 0
#End