Guap unix lab5

    #!/bin/bash
    #chkconfig: 3 10 90
    #description lab5_MitrofanovDA_script

    . /etc/init.d/functions
    . /etc/sysconfig/network

    if [ ! -f /etc/sysconfig/network ]; then
        exit 0
    fi

    if [ -f /etc/sysconfig/network-scripts/ifcfg-eth1 ]; then
        . /etc/sysconfig/network-scripts/ifcfg-eth1
    fi

    [ "${NETWORKING}" = "no" ] && exit 0
    [ -x /sbin/ifconfig ] || exit 1

    case "$1" in
        start)
            echo "Активируем eth1"
            ifconfig eth1 ${IPADDR} netmask ${NETMASK} up
            echo "Включаем маршрутизацию, обновляем iptables"
            echo 1 > /proc/sys/net/ipv4/ip_forward
            iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
            iptables -A INPUT -i eth1 -p TCP -s 0.0.0.0 --sport 22 -j DROP
            sleep 0.5
            ifconfig eth1 | grep UP > /dev/null
                    if [ $? = 0 ]
                        then echo -e "\e[1;32mOK\e[0m"
                        else echo -e "\e[1;31mОшибка: интерфейс не активирован\e[0m"
                    fi
            ;;
        stop)
            echo "Деактивация eth1, отключаем маршрутизацию"
            ifconfig eth1 ${IPADDR} netmask ${NETMASK} down
            echo 0 > /proc/sys/net/ipv4/ip_forward
            echo "Очищаем iptables"
            iptables -F
            ifconfig eth1 | grep UP > /dev/null
                    if [ ! $? = 0 ]
                        then echo -e "\e[1;32mOK\e[0m"
                        else echo -e "\e[1;31mОшибка: интерфейс не активирован\e[0m"
                    fi
            ;;
        status)
            iptables -L -n
            echo "--------"
            ifconfig
            echo "--------"
            route -n
            cat /proc/sys/net/ipv4/ip_forward
            echo "--------"
            ;;
    esac

    exit 0