#!/bin/bash

#本脚本是自动获取静态IP地址,并修改selin和清空iptables.

#日期:--

#编写:WK
#定义检查函数,错误和正确会显示红字并闪烁.

check() {

if [ $? !=  ]

then 
       echo -e '\e[1;5;31m ERROR \e[0m'

        exit

else

        echo -e '\e[1;5;31m OK \e[0m'

fi

}
#释放IP并查看IP地址

dhclient -r

ifconfig -a >/dev/null

dhclient

check
#截取IP,网关,掩码,dns段.

ip=`ifconfig -a |grep -A1 'eth0' |sed '1d'|awk -F ':' '{print $2}'|awk '{print $1}'`

gateway=`route -n |awk '{print $2}'|sed '1,3d'`

netmask=`route -n |awk '{print $3}'|sed '1,2d'|sed 2d`

dns1=`cat /etc/resolv.conf |awk '{print $2}'|sed 1d|sed 2d`

dns2=`cat /etc/resolv.conf |awk '{print $2}'|sed 1d|sed 1d`

eth0="/etc/sysconfig/network-scripts/ifcfg-eth0"
#修改ONBOOT和BOOTPROTO

sed -i 's/ONBOOT\=no/ONBOOT\=yes/' $eth0

sed -i 's/BOOTPROTO\=dhcp/BOOTPROTO\=static/' $eth0

check
#判断地址段是否存在,若存在删除并重新填入,若不存在直接填写(写的比较繁琐)

if `grep -q 'IPADDR' $eth0 `

then

        sed -i '/^IP/d' $eth0

        echo "IPADDR=$ip" >>$eth0

else

        echo "IPADDR=$ip" >>$eth0

fi

check

if `grep -q  'GATEWAY' $eth0`

then

        sed -i '/^GATE/d' $eth0

        echo "GATEWAY=$gateway" >>$eth0

else

        echo "GATEWAY=$gateway" >>$eth0

fi

check

if `grep -q 'NETMASK' $eth0`

then

        sed -i '/^NET/d' $eth0

        echo "NETMASK=$netmask" >>$eth0

else

        echo "NETMASK=$netmask" >>$eth0

fi

check

if `grep -q  'DNS1' $eth0`

then

        sed -i '/^DNS1/d' $eth0

        echo "DNS1=$dns1" >>$eth0

else

        echo "DNS1=$dns1" >>$eth0

fi

check

if `grep -q  'DNS2' $eth0`

then

         sed -i '/^DNS2/d' $eth0

        echo "DNS2=$dns2" >>$eth0

else

        echo "DNS2=$dns2" >>$eth0

fi

check
#重启网卡

service network restart

check

#关闭selinux

sed -i 's/SELINUX\=enforcing/SELINUX\=disabled/' /etc/selinux/config

selinux_s=`getenforce`

if [ $selinux_s ==  "enforcing" ]

then

        setenforce

fi

check
#保存并清空iptables

iptables-save > /etc/sysconfig/iptables_`date +%s`

iptables -F

service iptables save

check

#检查网络是否通畅

ping -c  www.qq.com

check

echo "-------------------------------->"

echo -e "\033[4;33mYour IP address is-->$ip\033[0m"