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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: ./brset.sh <bridge> <eth> <mac> <tap> [<tap> <tap> ...]

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

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

# The tap interface can subsequently be deleted (so long as no one else is

# using it) with

# openvpn --rmtun --dev tap<n>

# Define Bridge Interface

br=$1

shift

# Host ethernet interface to use

eth=$1

shift

# 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/'`

# Define list of TAP interfaces to be bridged,

tap=$*

echo "Deleting bridge $br"

echo "  Host Ethernet device: $eth"

echo "  Host IP address:      $eth_ip"

echo "  Host netmask:         $eth_netmask"

echo "  Host broadcast:       $eth_broadcast"

# Delete the bridge

ifconfig $br down

brctl delbr $br

# Restore the Ethernet interface

ifconfig $eth $eth_ip netmask $eth_netmask broadcast $eth_broadcast