#!/bin/sh
#   
#   Copyright (C) 2006-2007 Lars Engels <lars.engels@0x20.net>
#   Use and distribute under BSD license.
#

usage() {
    echo -e "Usage: `basename $0` <Options> [-I <interface>]\nUse -h or --help for more help.\n"
    exit 1
}

help() {
    echo    "`basename $0` displays the current network configuration, such as IP/MAC address, subnetmask, default route etc."
    echo    "The output can be used in cooperation with other scripts to set or display the network configuration."
    echo -e "Usage: `basename $0` <Options> [-I <interface>]\n"
    echo    "Options can be one of the following:"
    echo -e "\t-d/--dhcp-running\n\tChecks wether dhclient is running or not. Returns 'true' or 'false'\n"
    echo -e "\t-g/--default-gateway\n\tReturns the default gateway\n"
    echo -e "\t-h/--help\n\tDisplays this help\n"
    echo -e "\t-i/--ip-address\n\tReturns the interface's IP address. Together with -I\n"
    echo -e "\t-s/--subnetmask\n\tReturns the interface's subnetmask. Together with -I\n"
    echo -e "\t-m/--mac-address\n\tReturns the interface's MAC address. Together with -I"
}

if [ -z "$1" ]; then
    usage
fi

if [ $# -eq 1 ]; then
    case $1 in
        -d|--dhcp-running)
        if [ -n "`pgrep dhclient 2>&1`" ]; then
            echo "true"
        else
            echo "false"
        fi
        ;;
        -g|--default-gateway)
            /sbin/route -n get default  | awk '$1 ~ /gateway/ {print $2}'
        ;;
        -h|--help)
            help
        ;;
        *)
            usage
        ;;
    esac
elif  [ $# -lt 4  ] && [ $2 = "-I" ]; then
        if [ ! "`ifconfig $3 2>/dev/null`" ]; then
            echo "There is no such interface $3"
            exit 3
        fi
        case $1 in
            -i|--ip-address)
                /sbin/ifconfig $3 inet | awk '$1 ~ /inet/ {print $2}'
            ;;
            -s|--subnetmask)
                /sbin/ifconfig $3 inet | awk '$1 ~ /inet/ {print $4}'
            ;;
            -m|--mac-address)
                /sbin/ifconfig $3 ether | awk '$1 ~ /ether/ {print $2}'
            ;;
            *)
                echo "Unrecognized Option: $1"
                exit 2
            ;;
        esac
    else
        usage
fi
exit 0