#!/bin/bash

#################################################################################
# Copyright Arif Ali - aali@ocf.co.uk, OCF Plc.                                 #
# Copyright from 2014 to the legal extent of UK law.                            #
# Distribution is only permitted with written consent from Arif Ali or OCF Plc. #
#################################################################################
#                                                                               #
# Authors: Arif Ali - aali@ocf.co.uk, OCF plc                                   #
#                                                                               #
#################################################################################

#
# This script allows you add the an external gateway and dns for external network
# access. This is useful for login nodes, or atleast external facing nodes
# 
# We just need to set the networkname as referenced in the networks table to use
# in this script using the -s paramater
#
# The script will by default will only work with the login profile, you can change
# that using the -p flag
#
# This is a Linux only script
#

#set -ax

logger -t xcat "Install: $0 $*"

usage() { echo "$0 -n <netname> [-i <installroot>]" 1>&2; exit 1; }

while getopts i:n:? flag; do
  case $flag in
    i)
      installroot=$OPTARG
      ;;
    n)
      NETNAME=$OPTARG
      ;;
    ?)
      usage
      ;;
  esac
done

[[ -z "$NETNAME" ]] && usage
[[ -z "$installroot" ]] && installroot=/

num_index=1
found=0

# go through all the networks defined, and check to see if it is in $NETNAME
while [ $num_index -le $NETWORKS_LINES ]; do
  eval str_temp=\$NETWORKS_LINE$num_index
  str_temp_name=`echo $str_temp | awk -F'netname=' '{print $2}' | awk -F'|' '{print $1}'`
  if [ "$str_temp_name" = "${NETNAME}" ];then
      found=1
      break
  fi
  num_index=$((num_index+1))
done

# If we don't find the defined network, then exit
[ $found -eq 0 ] && exit 0

# Do the gateway
str_gateway=`echo $str_temp | awk -F'gateway=' '{print $2}' | awk -F'|' '{print $1}'`

if [ $str_gateway != "" ]; then

  sed -ibak -e '/GATEWAY/d' $installroot/etc/sysconfig/network
  echo GATEWAY=$str_gateway >> $installroot/etc/sysconfig/network

  ip route del default
  ip route add default via $str_gateway

fi

# Do the nameservers
str_nameservers=`echo $str_temp | awk -F'nameservers=' '{print $2}' | awk -F'|' '{print $1}'`

if [[ $str_nameservers != "" ]]; then

  for nameserver in `echo $str_nameservers | tr ',' ' '` ; do

    if [[ ! `grep $nameserver $installroot/etc/resolv.conf` ]] ; then
      echo "nameserver $nameserver" >> $installroot/etc/resolv.conf
    fi

    done

fi