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#!/bin/bash

# Copyright (C) 2010 ORSoC AB

# Copyright (C) 2010 Embecosm Limited

# Contributor Julius Baxter <julius.baxter@orsoc.se>

# Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

# This file is a superuser script to close down an Ethernet bridge and restore

# the simple Ethernet interface.

# This program is free software; you can redistribute it and/or modify it

# under the terms of the GNU General Public License as published by the Free

# Software Foundation; either version 3 of the License, or (at your option)

# any later version.

# This program is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

# more details.

# You should have received a copy of the GNU General Public License along

# with this program.  If not, see <http://www.gnu.org/licenses/>.

# ------------------------------------------------------------------------------

# Pre-requisites: bridge-utils must be installed.

# Usage: ./brend.sh <bridge> <eth> <tap>

# - <bridge> is the bridge interface to use, e.g. br0

# - <eth> is the hardware ethernet interface to use, e.g. eth0

# - <tap> is the tap interface to use, e.g. tap0

# Check we have the right number of arguments

if [ "x$#" != "x3" ]

then

    echo "Usage: ./brend.sh <bridge> <eth> <tap>"

    exit 1

fi

# Check we are root

euid=`id -un`

if [ "x${euid}" != "xroot" ]

then

    echo "Must run as root"

    exit 1

fi

# Break out the arguments

br=$1

eth=$2

tap=$3

# Determine the IP address, netmask and broadcast of the bridge.

eth_ip=`ifconfig $br | \

        grep "inet addr" | \

        head -1 | \

        sed -e 's/^.*inet addr:\([^ \t]*\).*$/\1/'`

eth_netmask=`ifconfig $br | \

        grep "Mask" | \

        head -1 | \

        sed -e 's/^.*Mask:\([^ \t]*\).*$/\1/'`

eth_broadcast=`ifconfig $br | \

        grep "Bcast" | \

        head -1 | \

        sed -e 's/^.*Bcast:\([^ \t]*\).*$/\1/'`

# Close the firewall to the tap and bridge

iptables -D INPUT -i ${tap} -j ACCEPT

iptables -D INPUT -i ${br} -j ACCEPT

iptables -D FORWARD -i ${br} -j ACCEPT

# Take down the bridge and delete it

ifconfig ${br} down

if [ $? != 0 ]

then

    echo "Failed to take down ${br}"

    exit 1

fi

brctl delbr ${br}

if [ $? != 0 ]

then

    echo "Failed to take delete ${br}"

    exit 1

fi

# Delete the TAP interface. Note we mustn't have anything using it. It's

# rather harsh, but we use fuser to ensure this (it will take out all users of

# any TAP/TUN interface).

fuser -k /dev/net/tun

openvpn --rmtun --dev ${tap}

if [ $? != 0 ]

then

    echo "Failed to remove ${tap}"

    exit 1

fi

# Restore the Ethernet interface. We could use ifconfig with the IP address,

# netmask and broadcast mask from earlier, but this does not work in a DHCP

# world (the MAC has changed). Instead we use a single shot dhcp

# configuration. In future the extant eth0 dhclient will refresh the lease.

dhclient -1 -d ${eth0}

if [ $? != 0 ]

then

    echo "Failed to get lease for ${eth}"

    exit 1

fi

# Kill the outstanding br0 DHCL client

kill `ps ax | grep "dhclient.*${br}" | grep -v "grep" | cut -c 1-5`