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#!/bin/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.
#
# 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'
[ -x /usr/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="$IF_DNS_SEARCH $part3"
fi
fi
done
R=""
for SS in $IF_DNS_SEARCH ; do
R="${R}search $SS
"
done
for NS in $IF_DNS_NAMESERVERS ; do
R="${R}nameserver $NS
"
done
echo -n "$R" | /usr/sbin/resolvconf -a "${dev}.inet"
;;
down)
/usr/sbin/resolvconf -d "${dev}.inet"
;;
esac
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