#!/bin/sh
# tap: set up/down a tap device

fatal() { echo $* 1>&2; exit 1; }
usage="usage: tap cmd [args]"

cmd=$1
shift || fatal $usage
user=`whoami`

# Create the tap device with tunctl
iface=`sudo tunctl -b -u $user`
# or openvpn
#iface=tap0
#sudo openvpn --mktun --dev $iface --user $user

# Bring the tap device up
sudo /sbin/ifconfig $iface 0.0.0.0 up

# Add it to the bridge
sudo /usr/sbin/brctl addif br0 $iface

# Launch 9vx (use -F to not fork)
$cmd "$@" -F "ether0=type=tap dev=$iface"

# Bring the tap device down and disconnect from br0
sudo /sbin/ifconfig $iface down
sudo /usr/sbin/brctl delif br0 $iface

# Remove the tap device with tunctl
sudo tunctl -d $iface &> /dev/null
# or openvpn
#sudo openvpn --rmtun --dev $1