#!/usr/bin/env bash
#
# Parses DHCP options from openvpn to update resolv.conf
# To use set as 'up' and 'down' script in your openvpn *.conf:
# up /etc/openvpn/update-resolv-conf
# down /etc/openvpn/update-resolv-conf
#
# Used snippets of resolvconf script by Thomas Hood <jdthood@yahoo.co.uk>
# and Chris Hanson
# Licensed under the GNU GPL.  See /usr/share/common-licenses/GPL.
# 07/2013 colin@daedrum.net Fixed intet name
# 05/2006 chlauber@bnc.ch
#
# Example envs set from openvpn:
# foreign_option_1='dhcp-option DNS 193.43.27.132'
# foreign_option_2='dhcp-option DNS 193.43.27.133'
# foreign_option_3='dhcp-option DOMAIN be.bnc.ch'
# foreign_option_4='dhcp-option DOMAIN-SEARCH bnc.local'

## The 'type' builtins will look for file in $PATH variable, so we set the
## PATH below. You might need to directly set the path to 'resolvconf'
## manually if it still doesn't work, i.e.
## RESOLVCONF=/usr/sbin/resolvconf
export PATH=$PATH:/sbin:/usr/sbin:/bin:/usr/bin
#RESOLVCONF=$(type -p resolvconf)

case $script_type in

up)
cp -af /etc/resolv.conf /dev/shm/
  for optionname in ${!foreign_option_*} ; do
    option="${!optionname}"
    echo $option
    part1=$(echo "$option" | cut -d " " -f 1)
    if [ "$part1" == "dhcp-option" ] ; then
      part2=$(echo "$option" | cut -d " " -f 2)
      part3=$(echo "$option" | cut -d " " -f 3)
      if [ "$part2" == "DNS" ] ; then
        IF_DNS_NAMESERVERS="$IF_DNS_NAMESERVERS $part3"
      fi
      if [[ "$part2" == "DOMAIN" || "$part2" == "DOMAIN-SEARCH" ]] ; then
        IF_DNS_SEARCH="$IF_DNS_SEARCH $part3"
      fi
    fi
  done
  R=""
  S=""
  if [ "$IF_DNS_SEARCH" ]; then
    S="search "
    for DS in $IF_DNS_SEARCH ; do
      S="${R} $DS"
    done
  S="${S}"
  fi

  for NS in $IF_DNS_NAMESERVERS ; do
    R="${R}nameserver $NS"
  done
  if [ -z "$R" ];
  then
	echo "no dns server's pushed"
  else
  	connmanctl config ethernet_xxxxxxxxxxxxx_cable --nameservers $R
  fi
    if [ -z "$S" ];                                               
  then                                                          
        echo "no domain pushed"                           
  else                                                                           
        echo $S >> /etc/resolv.conf           
  fi       
  ;;
down)
  mv /dev/shm/resolv.conf /etc/
  ;;
esac
exit 0