openvpn-update-resolv-conf

   1 #!/bin/bash
   2 #
   3 # Parses DHCP options from openvpn to update resolv.conf
   4 # To use set as 'up' and 'down' script in your openvpn *.conf:
   5 # up /usr/lib/openvpn/update-resolv-conf
   6 # down /usr/lib/openvpn/update-resolv-conf
   7 #
   8 # Used snippets of resolvconf script by Thomas Hood <jdthood@yahoo.co.uk>
   9 # and Chris Hanson
  10 # Licensed under the GNU GPL.
  11 #
  12 # 05/2006 chlauber@bnc.ch
  13 #
  14 # Example envs set from openvpn:
  15 # foreign_option_1='dhcp-option DNS 193.43.27.132'
  16 # foreign_option_2='dhcp-option DNS 193.43.27.133'
  17 # foreign_option_3='dhcp-option DOMAIN be.bnc.ch'
  18
  19 [ -x /sbin/resolvconf ] || exit 0
  20
  21 case $script_type in
  22
  23 up)
  24         for optionname in ${!foreign_option_*} ; do
  25                 option="${!optionname}"
  26                 echo $option
  27                 part1=$(echo "$option" | cut -d " " -f 1)
  28                 if [ "$part1" == "dhcp-option" ] ; then
  29                         part2=$(echo "$option" | cut -d " " -f 2)
  30                         part3=$(echo "$option" | cut -d " " -f 3)
  31                         if [ "$part2" == "DNS" ] ; then
  32                                 IF_DNS_NAMESERVERS="$IF_DNS_NAMESERVERS $part3"
  33                         fi
  34                         if [ "$part2" == "DOMAIN" ] ; then
  35                                 IF_DNS_SEARCH="$part3"
  36                         fi
  37                 fi
  38         done
  39         R=""
  40         if [ "$IF_DNS_SEARCH" ] ; then
  41                 R="${R}search $IF_DNS_SEARCH
  42 "
  43         fi
  44         for NS in $IF_DNS_NAMESERVERS ; do
  45                 R="${R}nameserver $NS
  46 "
  47         done
  48         echo -n "$R" | /sbin/resolvconf -a "${dev}.inet"
  49         ;;
  50 down)
  51         /sbin/resolvconf -d "${dev}.inet"
  52         ;;
  53 esac
  54