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#!/bin/bash
# Copyright (c) 2005-2008 Telethra, Inc.
# Licensed under the GPL version 2
# First version by Jesse Adelman
# someone at boldandbusted dink com
# http://www.boldandbusted.com/
# PURPOSE: This script automatically removes the /etc/resolv.conf entries previously
# set by the companion script "client.up".
# INSTALL NOTES:
# Place this in /etc/openvpn/client.down
# Then, add the following to your /etc/openvpn/<clientconfig>.conf:
# client
# pull dhcp-options
# up /etc/openvpn/client.up
# down /etc/openvpn/client.down
# Next, "chmod a+x /etc/openvpn/client.down"
# USAGE NOTES:
# Note that this script is best served with the companion "client.up"
# script.
# Only tested on Gentoo Linux 2005.0 with OpenVPN 2.0
# It should work with any GNU/Linux with /etc/resolv.conf
# This runs with the context of the OpenVPN UID/GID
# at the time of execution. This generally means that
# the client "up" script will run fine, but the "down" script
# will require the use of the OpenVPN "down-root" plugin
# which is in the plugins/ directory of the OpenVPN source tree
# A horrid work around, from a security perspective,
# is to run OpenVPN as root. THIS IS NOT RECOMMENDED. You have
# been WARNED.
# init variables
i=1
j=1
unset fopt
unset dns
unset opt
# Convert ENVs to an array
while fopt=foreign_option_$i; [ -n "${!fopt}" ]; do
{
opt[i-1]=${!fopt}
case ${opt[i-1]} in
*DOMAIN* ) domain=`echo ${opt[i-1]} | \
sed -e 's/dhcp-option DOMAIN //g'` ;;
*DNS* ) dns[j-1]=`echo ${opt[i-1]} | \
sed -e 's/dhcp-option DNS //g'`
let j++ ;;
esac
let i++
}
done
# Now, do the work
if [ -n "${dns[*]}" ]; then
for i in "${dns[@]}"; do
sed -i -e "/nameserver ${i}/D" /etc/resolv.conf || die
done
fi
if [ -n "${domain}" ]; then
sed -i -e "/search ${domain}/D" /etc/resolv.conf || die
fi
# all done...
exit 0
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