#!/bin/sh

# Licensed to the Apache Software Foundation (ASF) under one

# or more contributor license agreements. See the NOTICE file

# distributed with this work for additional information

# regarding copyright ownership. The ASF licenses this file

# to you under the Apache License, Version 2.0 (the

# "License"); you may not use this file except in compliance

# with the License. You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing,

# software distributed under the License is distributed on an

# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

# KIND, either express or implied. See the License for the

# specific language governing permissions and limitations

# under the License.

set -e

usage() {

echo "$0 [-g |-d] <ip address>"

echo " -g output the gateway for this ip address"

exit 1

}

gflag=

while getopts 'g' OPTION

do

case $OPTION in

g) gflag=1

;;

?) usage

exit 1

;;

esac

done

if [ "$gflag" != "1" ]

then

usage

fi

shift $(($OPTIND - 1))

ipaddr=$1

[ -z "$ipaddr" ] && usage

device=$(ip addr | grep $1 | head -1 | awk '{print $NF}')

defaultdev=$(ip route | grep default | awk '{print $NF}')

if [ "$device" == "$defaultdev" ]

then

gateway=$(ip route | grep default | awk '{print $3}')

fi

[ -n "$gflag" ] && echo $gateway && exit 0