#!/bin/sh
# Copyright 2003 Konstantin Kabassanov <Konstantin.Kabassanov@lip6.fr> LIP6
# Copyright 2003 Vincent Jardin <jardin@6wind.com> 6WIND
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#      This product includes software developed by Konstantin Kabassanov, LIP6
#      This product includes software developed by Vincent Jardin, 6WIND
# 4. Neither the name of the authors, of LIP6, of 6WIND nor the names of any
#    co-contributors may be used to endorse or promote products derived
#    from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY LIP6 AND 6WIND AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL LIP6 OR 6WIND BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Work funded by EuronetLab (http://www.euronetlab.net/).
# $Id: teredo.relay,v 1.2 2003/10/22 23:17:22 vjardin Exp $
# $FreeBSD$

# This script sets up a Teredo Relay
#

# Here define the parameters of the relay
#
# 195.220.208.2 teredo.ipv6.6wind.com
SERVER_IP=195.220.208.2
# Define a static global IPv6 address used to send the bubbles,
# or let the script looking for an address.
#SERVER_IP6="2001:660:3008:1970::2"
SERVER_IP6="auto"

# You should never change this value, otherwise update
# ng_teredo.h
#
SERVER_UDP_PORT=3544

# Enforce IPv6 interfaces to get an IPv6 link-local address
# 
sysctl -w net.inet6.ip6.auto_linklocal=1

# Create the interface node ``IFACE_TEREDO'' if it doesn't exist
# already, otherwise just make sure it's not connected to anything.
#
IFACE_TEREDO="ng0"
if ifconfig ${IFACE_TEREDO} >/dev/null 2>&1; then
	ifconfig ${IFACE_TEREDO} inet6 down delete >/dev/null 2>&1
	ngctl shutdown ${IFACE_TEREDO}:
fi
ngctl mkpeer iface dummy inet6

# Attach the Teredo node socket to the ``inet6'' hook of the
# interface node using the ng_iface(4) node type.
#
ngctl mkpeer ${IFACE_TEREDO}: teredo inet6 upstream
NAME="ter0"
ngctl name ${IFACE_TEREDO}:inet6 ${NAME}

# Enable debugging information
#
ngctl msg ${NAME}: setverbose 0x03

# Set the origin address of the Relay
#
ngctl msg ${NAME}: setorigin ${SERVER_IP}

# Set the IPv6 address
#
if [ "$SERVER_IP6" = "auto" ] ; then
  SERVER_IP6="`ifconfig -a | grep  inet6 | awk '{ print $2 }' | grep -v fe80 | grep -v fec0 | grep -v "^::1" | head -1`"
  if [ "$SERVER_IP6" = "" ] ; then
    echo "Error: global IPv6 address not found. Please define one" >&2
    exit 1
  fi
  echo "Using $SERVER_IP6 to source the bubbles"
else
  # Check if this static address is already set on an interface.
  # If not, configure it on our Teredo interface.
  TEST="`ifconfig -a | grep "$SERVER_IP6"`"
  if [ "${TEST}" = "" ] ; then
    ifconfig ${IFACE_TEREDO} inet6 ${SERVER_IP6}/128
  fi
fi
ngctl msg ${NAME}: setglobal "$SERVER_IP6"

# Wakeup the Teredo interface
#
ifconfig ${IFACE_TEREDO} up

# XXX Set the linklocal address of the Teredo interface
#
LLIF=`ifconfig ${IFACE_TEREDO} inet6 | grep fe80 | head -1 | awk '{ print $2}' | cut -d "%" -f 1`
if [ "${LLIF}" = "" ] ; then
  echo "error: ${IFACE_TEREDO} does not have a linklocal address"
  exit 1
fi
ngctl msg ${NAME}: setlinklocal ${LLIF}

# Attach a UDP socket to the ``downstream'' hook of the Teredo
# node using the ng_ksocket(4) node type.
#
ngctl mkpeer ${NAME}: ksocket downstream inet/dgram/udp

# Bind the UDP socket to the local relay IPv4 address
#
ngctl msg ${NAME}:downstream bind inet/${SERVER_IP}:${SERVER_UDP_PORT}

# Enable IPv6 forwarding
# 
sysctl -w net.inet6.ip6.forwarding=1

# Add the IPv6 Teredo route
#
route add -inet6 3ffe:831f:: -prefixlen 32 -iface ${IFACE_TEREDO}