#!/bin/bash
###############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2012  IPFire Network Development Team                         #
#                                                                             #
# 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/>.       #
#                                                                             #
###############################################################################

# Load all global configuration files.
function config_read_globals() {
	network_config_read
	firewall_config_read
}

function config_read() {
	local config_file=${1}
	assert isset config_file

	if [ -e "${config_file}" ]; then
		. ${config_file}
		config_check
	fi
}

function config_write() {
	local config_file=${1}
	assert isset config_file
	shift

	# Check if all values to be written are sane
	config_check

	log DEBUG "Writing configuration file ${config_file}."

	mkdir -p $(dirname ${config_file}) 2>/dev/null
	> ${config_file}

	local param
	for param in $(listsort $@); do
		echo "${param}=\"${!param}\"" >> ${config_file}
	done
}

function config_print() {
	local param

	for param in $(listsort $@); do
		printf "%-24s = %s\n" "${param}" "${!param}"
	done
}

function config_check() {
	# If there is a function defined that is called __check
	# we call that function
	[ -n "$(type -t _check)" ] && _check
}

function config_header() {
	local what=${1}
	assert isset what

	# Print the header.
	echo "#"
	echo "# This is a ${what}."
	echo "# THIS FILE IS AUTOMATICALLY GENERATED AND"
	echo "# ANY CUSTOM CHANGES WILL BE OVERWRITTEN!"
	echo "#"
	echo "# $(date -u)"
	echo "#"
	echo
}

function config_hostname() {
	local hostname=${1}

	if [ -n "${hostname}" ]; then
		echo "${hostname}" > ${CONFIG_HOSTNAME}
	else
		echo "$(<${CONFIG_HOSTNAME})"
	fi
}

function config_set() {
	while [ $# -gt 0 ]; do
		case "${1}" in
			*=*)
				log INFO "Setting configuration option '${1}'".			
				eval ${1}
				;;
			*)
				warning "Invalid parameter given: ${1}"
				;;
		esac
		shift
	done
}

function network_config_read() {
	# Save state of DEBUG and restore it later.
	local debug=${DEBUG}

	config_read ${NETWORK_CONFIG_FILE}

	if [ -n "${debug}" ]; then
		DEBUG=${debug}
	fi
}

function network_config_write() {
	config_write ${NETWORK_CONFIG_FILE} ${NETWORK_CONFIG_FILE_PARAMS}

	# Update DNS configuration.
	dns_generate_resolvconf
}

function network_config_print() {
	config_print ${NETWORK_CONFIG_FILE_PARAMS}
}

function firewall_config_read() {
	config_read ${FIREWALL_CONFIG_FILE}
}

function firewall_config_write() {
	config_write ${FIREWALL_CONFIG_FILE} \
		${FIREWALL_CONFIG_PARAMS}
}

function firewall_config_print() {
	config_print ${FIREWALL_CONFIG_PARAMS}
}