#!/bin/sh
#
# Copyright (c) 2002-2004  Hajimu UMEMOTO
# 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.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR OR CONTRIBUTORS 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.
#
# $Mahoroba$
#

# Usage:
#   6to4.sh ipv4addr ipv6_defaultrouter

# Example of host configuration in /etc/rc.conf:
#   ipv6_enable="YES"

# Example of network configuration in /etc/rc.conf:
#   ipv6_enable="YES"
#   ipv6_gateway_enable="YES"
#   rtadvd_enable="YES"
#   rtadvd_interfaces="fxp0"
#   stf_network_ipv6_interface="fxp0"
#   stf_network_ipv6_slaid="1"		# default

# TODO:
#   - Multiple local side interfaces

if [ -r /etc/defaults/rc.conf ]; then
	. /etc/defaults/rc.conf
	source_rc_confs
elif [ -r /etc/rc.conf ]; then
	. /etc/rc.conf
fi

stf_interface_ipv4addr="$1"
ipv6_defaultrouter="$2"

case ${ipv6_enable} in
[Yy][Ee][Ss])
	if [ -r /etc/rc.network6 ]; then
		. /etc/rc.network6
	else
		. /etc/network.subr
	fi

	# 6to4 setup
	ifconfig stf0 create >/dev/null 2>&1
	oldaddrs=`ifconfig stf0 inet6 | awk '/inet6 2002:/ {print $2}'`
	for oaddr in ${oldaddrs}; do
		ifconfig stf0 inet6 ${oaddr} -alias
	done
	network6_stf_setup

	# setup static routes
	if [ -n "${ipv6_defaultrouter}" ]; then
		route delete -inet6 default >/dev/null 2>&1
		route add -inet6 default ${ipv6_defaultrouter}
	fi

	# setup local side
	case ${stf_network_ipv6_interface} in
	[Nn][Oo] | '')
		;;
	*)
		oldaddrs=`ifconfig ${stf_network_ipv6_interface} inet6 | awk '/inet6 2002:/ {print $2}'`
		for oaddr in ${oldaddrs}; do
			ifconfig ${stf_network_ipv6_interface} inet6 ${oaddr} -alias
		done
		OIFS="$IFS"
		IFS=".$IFS"
		set ${stf_interface_ipv4addr}
		IFS="$OIFS"
		ipv4_in_hexformat=`printf "%x:%x\n" \
			$(($1*256 + $2)) $(($3*256 + $4))`
		eval ipv6_prefix_${stf_network_ipv6_interface}=\"2002:${ipv4_in_hexformat}:${stf_network_ipv6_slaid:-1}\"
		network6_interface_setup ${stf_network_ipv6_interface}
		;;
	esac
	;;
esac