#!/bin/bash

# if [ $# -ne 1 ]; then
   # echo "Usage $0 your.ip.add.res"
   # exit 1
# fi

get_gateway_ip() {
   local ip=`/sbin/ip -o -4 addr list eth0 | awk '{print $4}' | cut -d/ -f1`
   local sip=`echo $ip | awk -F. '{printf "%s.%s.%s.x",$1,$2,$3}'`
   local gateway_ip=

   ipsNode1="
142.4.196.x
192.95.36.x
192.95.39.x
198.50.158.x
198.50.195.x
198.50.128.x
198.27.121.x
"
   gateway1="192.99.16.254"
   ipsNode2="
198.50.209.x
198.27.118.x
"
   gateway2="192.99.17.254"
   ipsNode3="
192.95.10.x
198.50.218.x
198.50.196.x
198.27.98.x
198.50.230.x
198.50.168.x
"
   gateway3="192.99.17.254"
   for i in $ipsNode1; do
      if [ x"$sip" = "x$i" ]; then
         gateway_ip="$gateway1"
      fi
   done

   for i in $ipsNode2; do
      if [ x"$sip" = "x$i" ]; then
         gateway_ip="$gateway2"
      fi
   done

   for i in $ipsNode3; do
      if [ x"$sip" = "x$i" ]; then
         gateway_ip="$gateway3"
      fi
   done

   echo "$gateway_ip"
}

### main ###
gateway_ip=`get_gateway_ip "$1"`

if [ x"$gateway_ip" != "x" ]; then
    route add "$gateway_ip" dev eth0
    route add default gw "$gateway_ip"
   if [ -f /etc/network/interfaces ]; then
      sed '/^[ ]*/s/gateway 192./#gateway 192./g' -i /etc/network/interfaces
   fi
else
   echo "Couldn't determine your gateway, Contact support with this information!"
   exit 2
fi