update-resolv-conf for openvpn

gistfile1.txt

#!/usr/local/bin/bash
#
# Parses DHCP options from OpenVPN to update resolv.conf.
# To use set as ‘up’ and ‘down’ script in your openvpn config:
# up /etc/openvpn/update-resolv-conf
# down /etc/openvpn/update-resolv-conf
#
# credit:
# * Thomas Hood <jdthood@yahoo.co.uk>
# * Chris Hanson
# * chlauber@bnc.ch
#
# Licensed under the GNU GPL
#

[ -x /sbin/resolvconf ] || exit 0

case $script_type in
  up)
    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" ] ; then
          IF_DNS_SEARCH="$part3"
        fi
      fi
    done
    R=""
    if [ "$IF_DNS_SEARCH" ] ; then
      R="${R}search $IF_DNS_SEARCH"
    fi
    for NS in $IF_DNS_NAMESERVERS ; do
      R="${R}nameserver $NS"
    done
    echo -n "$R" | /sbin/resolvconf -a "${dev}.inet"
    ;;
  down)
    /sbin/resolvconf -d "${dev}.inet"
    cp /etc/openvpn/resolv.bak /etc/resolv.conf
    ;;
esac