#!/bin/bash
###############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2010  Michael Tremer & Christian Schmidt                      #
#                                                                             #
# 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/>.       #
#                                                                             #
###############################################################################

RADVD_CONFIGFILE="/etc/radvd.conf"

function radvd_update() {
	# (Re-)write the configuration file
	radvd_write_config

	# Reload the radvd service.
	service_reload radvd
}

function radvd_write_config() {
	# Clear the config file.
	__radvd_clear

	# Write header to the file.
	__radvd_write "#"
	__radvd_write "# This is the radvd daemon configuration file."
	__radvd_write "# THIS FILE IS AUTOMATICALLY GENERATED AND WILL OVERWRITE"
	__radvd_write "# ANY CUSTOM CHANGES!"
	__radvd_write "#"
	__radvd_write "# $(date -u)"
	__radvd_write "#\n"

	# Write the configuration for all zones.
	local zone
	for zone in $(zones_get_local); do
		__radvd_config_interface ${zone}
	done
}

function radvd_clear() {
	__radvd_clear
}

function __radvd_clear() {
	log DEBUG "Clearing radvd config file."

	: > ${RADVD_CONFIGFILE}
}

function __radvd_write() {
	echo -e "$@" >> ${RADVD_CONFIGFILE}
}

function __radvd_config_interface() {
	local zone=${1}
	shift

	assert isset zone

	log DEBUG "Writing radvd configuration for ${zone}"

	# If the interface does not provide any routing information,
	# we can skip this whole stuff.
	if ! routing_db_exists ${zone} ipv6; then
		return ${EXIT_OK}
	fi

	# Skip if zone is not active.
	local active=$(routing_db_get ${zone} ipv6 active)
	[ "${active}" = "0" ] && return ${EXIT_OK}

	# Skip if there is no prefix or prefix is link-local.
	local prefix=$(routing_db_get ${zone} ipv6 local-ip-address)
	if [ -z "${prefix}" ] || [ "${prefix:0:5}" = "fe80:" ]; then
		return ${EXIT_OK}
	fi

	__radvd_write "interface ${zone} {"
	__radvd_write "	AdvSendAdvert on;"
	__radvd_write "	MinRtrAdvInterval 3;"
	__radvd_write "	MaxRtrAdvInterval 10;"
	__radvd_write "	IgnoreIfMissing on;"
	__radvd_write ""
	__radvd_write "	prefix ${prefix} {"
	__radvd_write "		AdvOnLink on;"
	__radvd_write "		AdvAutonomous on;"
	__radvd_write "		AdvRouterAddr on;"
	__radvd_write "	};"
	__radvd_write "};\n"
}