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+#!/bin/sh
+
+# Copyright (c) 2005-2010 OpenVPN Technologies, 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 sets the proper /etc/resolv.conf entries
+# as pulled down from an OpenVPN server.
+
+# INSTALL NOTES:
+# Place this in /etc/openvpn/client.up
+# Then, add the following to your /etc/openvpn/<clientconfig>.conf:
+# client
+# up /etc/openvpn/client.up
+# Next, "chmod a+x /etc/openvpn/client.up"
+
+# USAGE NOTES:
+# Note that this script is best served with the companion "client.down"
+# script.
+
+# Tested under Debian lenny with OpenVPN 2.1_rc11
+# It should work with any UNIX with a POSIX sh, /etc/resolv.conf or resolvconf
+
+# 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.
+PATH=/bin:/usr/bin:/usr/local/bin:/sbin:/usr/sbin:/usr/local/sbin
+
+# init variables
+
+i=1
+domains=
+fopt=
+ndoms=0
+nns=0
+nl='
+'
+
+# $foreign_option_<n> is something like
+# "dhcp-option DOMAIN example.com" (multiple allowed)
+# or
+# "dhcp-option DNS 10.10.10.10" (multiple allowed)
+
+# each DNS option becomes a "nameserver" option in resolv.con
+# if we get one DOMAIN, that becomes "domain" in resolv.conf
+# if we get multiple DOMAINS, those become "search" lines in resolv.conf
+
+while true; do
+ eval fopt=\$foreign_option_${i}
+ [ -z "${fopt}" ] && break
+
+ case ${fopt} in
+ dhcp-option\ DOMAIN\ *)
+ ndoms=$((ndoms + 1))
+ domains="${domains} ${fopt#dhcp-option DOMAIN }"
+ ;;
+ dhcp-option\ DNS\ *)
+ nns=$((nns + 1))
+ if [ $nns -le 3 ]; then
+ dns="${dns}${dns:+$nl}nameserver ${fopt#dhcp-option DNS }"
+ else
+ printf "%s\n" "Too many nameservers - ignoring after third" >&2
+ fi
+ ;;
+ *)
+ printf "%s\n" "Unknown option \"${fopt}\" - ignored" >&2
+ ;;
+ esac
+ i=$((i + 1))
+done
+
+ds=domain
+if [ $ndoms -gt 1 ]; then
+ ds=search
+fi
+
+# This is the complete file - "$domains" has a leading space already
+out="# resolv.conf autogenerated by ${0} (${1})${nl}${dns}${nl}${ds}${domains}"
+
+# use resolvconf if it's available
+if type resolvconf >/dev/null 2>&1; then
+ printf "%s\n" "${out}" | resolvconf -p -a "${1}"
+else
+ # Preserve the existing resolv.conf
+ if [ -e /etc/resolv.conf ] ; then
+ cp /etc/resolv.conf /etc/resolv.conf.ovpnsave
+ fi
+ printf "%s\n" "${out}" > /etc/resolv.conf
+ chmod 644 /etc/resolv.conf
+fi
+
+exit 0