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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 set up an Ethernet bridge that can be

# used with Or1ksim via the TUN/TAP 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> <tap> [<tap> <tap> ...]

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

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

# - <tap> is/are the persistent TAP interface(s)

# The tap interfaces must have been previously set up persistently by the

# superuser using for example:

# openvpn --mktun --dev tap<n> --user <username> --group <groupname>

# Define Bridge Interface

br=$1

shift

# Host ethernet interface to use

eth=$1

shift

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

eth_ip=`ifconfig $eth | \

        grep "inet addr" | \

        head -1 | \

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

eth_netmask=`ifconfig $eth | \

        grep "Mask" | \

        head -1 | \

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

eth_broadcast=`ifconfig $eth | \

        grep "Bcast" | \

        head -1 | \

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

# Define list of TAP interfaces to be bridged,

tap=$*

echo "Creating bridge $br"

echo "  Host Ethernet device: $eth"

echo "  Host IP address:      $eth_ip"

echo "  Host netmask:         $eth_netmask"

echo "  Host broadcast:       $eth_broadcast"

echo "  Target TAP device(s): $tap"

# Create the bridge

brctl addbr $br

# Add the host Ethernet and TAP interfaces

brctl addif $br $eth

for t in $tap; do

    brctl addif $br $t

done

# Remove the IP addresses of the underlying interfaces

ifconfig $eth 0.0.0.0 promisc up

for t in $tap; do

    ifconfig $t 0.0.0.0 promisc up

done

# Reconfigure the bridge to have the Ethernet address that had been used just

# by $eth.

# ifconfig $br $eth_ip netmask $eth_netmask broadcast $eth_broadcast

dhclient $br