#!/bin/sh

# QEMU network interface configuration script
#
# Copyright (C) 2006-2007 OpenedHand Ltd.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

USER=$1

TUNCTL=`which tunctl`
[ "$TUNCTL" = "" ] && TUNCTL=/usr/sbin/tunctl

TAP=`$TUNCTL -b -u $USER`

IFCONFIG=`which ifconfig`
if [ "x$IFCONFIG" = "x" ]; then
    # better than nothing...
    IFCONFIG=/sbin/ifconfig
fi

n=$[ `echo $TAP | sed 's/tap//'` + 1 ]
$IFCONFIG $TAP 192.168.7.$n

# setup NAT for tap0 interface to have internet access in QEMU
IPTABLES=`which iptables`
if [ "x$IPTABLES" = "x" ]; then
    IPTABLES=/sbin/iptables
fi

$IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.0/24
echo 1 > /proc/sys/net/ipv4/ip_forward
$IPTABLES -P FORWARD ACCEPT

echo $TAP