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update-resolv-conf.sh
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update-resolv-conf.sh
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#!/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'
####
## Forked from https://github.com/masterkorp/openvpn-update-resolv-conf/blob/master/update-resolv-conf.sh
## Modified to work in a netconfig based linux distribution like OpenSUSE without much hack
## This script will update the dns settings using netconfig utility instaed of resolvconf
####
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" || "$part2" == "DOMAIN-SEARCH" ]] ; then
IF_DNS_SEARCH="$IF_DNS_SEARCH $part3"
fi
fi
done
cat<<EOF | /sbin/netconfig -v modify -i $dev -s openvpn
DNSSERVERS='$IF_DNS_NAMESERVERS'
DNSSEARCH='$IF_DNS_SEARCH'
EOF
;;
down)
/sbin/netconfig remove -i ${dev} -s openvpn
;;
esac
exit 0