#!/bin/bash
#
# Parses DHCP options from openvpn to update resolv.conf
# To use set as 'up' and 'down' script in your openvpn config file:
# script-security 2
# up /etc/openvpn/update-resolv-conf
# down /etc/openvpn/update-resolv-conf
# down-pre

[ "$script_type" ] || exit 0
[ "$dev" ] || exit 0

split_into_parts()
{
	part1="$1"
	part2="$2"
	part3="$3"
}

case "$script_type" in
  up)
	NMSRVRS=""
	SRCHS=""
	for optionvarname in ${!foreign_option_*} ; do
		option="${!optionvarname}"
		split_into_parts $option
		if [ "$part1" = "dhcp-option" ] ; then
			if [ "$part2" = "DNS" ] ; then
				NMSRVRS="${NMSRVRS:+$NMSRVRS }$part3"
			elif [ "$part2" = "DOMAIN" ] ; then
				SRCHS="${SRCHS:+$SRCHS }$part3"
			fi
		fi
	done
	if [ -z "$NMSRVRS" ]; then
		exit 0
	fi
	mv /etc/resolv.conf /etc/resolv.conf.bak
	for NS in $NMSRVRS ; do
        	echo "nameserver $NS" >> /etc/resolv.conf
	done
	for SEARCH in $SRCHS ; do
		echo "search $SEARCH" >> /etc/resolv.conf
	done
	;;
  down)
	mv /etc/resolv.conf.bak /etc/resolv.conf
  ;;
esac