#!/bin/sh /etc/rc.common
#
# Fwknop is developed primarily by the people listed in the file 'AUTHORS'.
# Copyright (C) 2009-2014 fwknop developers and contributors. For a full
# list of contributors, see the file 'CREDITS'.
#

USE_PROCD=1
START=95

. "${IPKG_INSTROOT}/lib/functions/network.sh"

FWKNOPD_BIN=/usr/sbin/fwknopd
FWKNOPD_CFGDIR=/var/etc/fwknop

start_service()
{
	generate_configuration

	if [ -n "${DEPEND_IFNAME}" ] ; then
		# We know the interface, so we can start
		procd_open_instance
		procd_set_param command "${FWKNOPD_BIN}" --foreground --syslog-enable
		procd_set_param respawn
		if [ "${UCI_ENABLED}" -eq 1 ]; then
			procd_append_param command -c "${FWKNOPD_CFGDIR}/fwknopd.conf"
			procd_append_param command -a "${FWKNOPD_CFGDIR}/access.conf"
		fi
		procd_append_param command -i "${DEPEND_IFNAME}"
		procd_set_param netdev "${DEPEND_IFNAME}"
		procd_close_instance
	else
		logger -p daemon.info -t "fwknopd[$$]" "Postponing start-up of fwknopd, network ${NETWORK} is not up"
	fi
}

service_triggers()
{
	procd_add_reload_trigger "fwknopd"

	if [ -n "${NETWORK}" ] ; then
		logger -p daemon.info -t "fwknopd[$$]" "Listening for changes on network ${NETWORK}"
		procd_add_reload_interface_trigger "${NETWORK}"
	fi
}

get_bool()
{
	local _tmp="${1}"
	case "${_tmp}" in
		1|on|true|yes|enabled) _tmp=1;;
		0|off|false|no|disabled) _tmp=0;;
		*) _tmp="${2}";;
	esac
	echo -n "${_tmp}"
}

generate_configuration()
{
	[ -f /tmp/access.conf.tmp ] && rm /tmp/access.conf.tmp

	UCI_ENABLED=0
	DEPEND_IFNAME=
	NETWORK=
	local PCAP_INTF=
	local USER_CONFIG_PATH=/etc/fwknop/fwknopd.conf
	local DEFAULT_UCI_NETWORK=wan
	local DEFAULT_FWKNOPD_IFNAME=

	network_get_device DEFAULT_FWKNOPD_IFNAME "${DEFAULT_UCI_NETWORK}"

	config_cb() {
		local type="${1}"
		local name="${2}"
		if [ "${type}" = "global" ]; then
			option_cb() {
				local option="${1}"
				local value="${2}"
				if [ "${option}" = "uci_enabled" ] && [ "$(get_bool "${value}" 0)" -eq 1 ] ; then
					mkdir -p "${FWKNOPD_CFGDIR}"
					> "${FWKNOPD_CFGDIR}/fwknopd.conf"
					> "${FWKNOPD_CFGDIR}/access.conf"
					chmod 600 "${FWKNOPD_CFGDIR}/fwknopd.conf"
					chmod 600 "${FWKNOPD_CFGDIR}/access.conf"
					UCI_ENABLED=1
				fi
			}
		elif [ "${type}" = "network" ]; then
			option_cb() {
				local option="${1}"
				local value="${2}"
				if [ "${UCI_ENABLED}" -eq 1 ] && [ "${option}" = "network" ]; then
					NETWORK="${value}"
				fi
			}
		elif [ "${type}" = "config" ]; then
			option_cb() {
				local option="${1}"
				local value="${2}"
				if [ "${UCI_ENABLED}" -eq 1 ]; then
					if [ "${option}" = "PCAP_INTF" ]; then
						PCAP_INTF="${value}"
					fi
					echo "${option} ${value}" >> "${FWKNOPD_CFGDIR}/fwknopd.conf"  #writing each option to fwknopd.conf
				fi
			}
		elif [ "${type}" = "access" ]; then
			if [ -f /tmp/access.conf.tmp ] ; then
				cat /tmp/access.conf.tmp >> "${FWKNOPD_CFGDIR}/access.conf"
				rm /tmp/access.conf.tmp
			fi
			option_cb() {
				local option="${1}"
				local value="${2}"
				if [ "${UCI_ENABLED}" -eq 1 ]; then
					if [ "${option}" = "SOURCE" ]; then
						echo "${option} ${value}" >> "${FWKNOPD_CFGDIR}/access.conf"  #writing each option to access.conf
					else
						echo "${option} ${value}" >> /tmp/access.conf.tmp  #writing each option to access.conf
					fi
				fi
			}
		else
			reset_cb
			if [ -z "${type}" ]; then
				# Finalize reading
				if [ -f /tmp/access.conf.tmp ] ; then
					cat /tmp/access.conf.tmp >> "${FWKNOPD_CFGDIR}/access.conf"
					rm /tmp/access.conf.tmp
				fi
			fi
		fi
	}

	if [ -f /etc/config/fwknopd ]; then
		config_load fwknopd
	fi

	if [ "${UCI_ENABLED}" -eq 0 ]; then
		if [ -f "${USER_CONFIG_PATH}" ] ; then
			# Scan user configuration for PCAP_INTF settings and fallback to fwknopd's default
			DEPEND_IFNAME="$( sed -ne '/^\s*PCAP_INTF\s\+/ { s/^\s*PCAP_INTF\s\+//; s/\s\+$//; p; q; }' ${USER_CONFIG_PATH} )"
			if [ -n "${DEPEND_IFNAME}" ]; then
				logger -p daemon.debug -t "fwknopd[$$]" "Found fwknopd.conf configuration, using PCAP_INTF interface ${DEPEND_IFNAME}"
			else
				logger -p daemon.info -t "fwknopd[$$]" "No PCAP_INTF interface specified in fwknopd.conf, fwknopd's default ${DEFAULT_FWKNOPD_IFNAME} will be used"
				DEPEND_IFNAME="${DEFAULT_FWKNOPD_IFNAME}"
			fi
		else
			logger -p daemon.error -t "fwknopd[$$]" "No ${USER_CONFIG_PATH} found, not starting"
			exit 1
		fi
	elif [ "${UCI_ENABLED}" -eq 1 ]; then
		if [ -n "${NETWORK}" ] && [ -n "${PCAP_INTF}" ]; then
			logger -p daemon.warn -t "fwknopd[$$]" "Specified both network and PCAP_INTF. Ignoring PCAP_INTF"
		elif [ -z "${NETWORK}" ] && [ -z "${PCAP_INTF}" ]; then
			# Fallback - compatibility with old script, which used wan interface by default
			logger -p daemon.info -t "fwknopd[$$]" "Neither network, nor PCAP_INTF interface specified, trying network ${DEFAULT_UCI_NETWORK}"
			NETWORK="${DEFAULT_UCI_NETWORK}"
		fi

		# Resolve network if possible
		if [ -n "${NETWORK}" ]; then
			network_get_device DEPEND_IFNAME "${NETWORK}"
			if [ -n "${DEPEND_IFNAME}" ]; then
				logger -p daemon.debug -t "fwknopd[$$]" "Resolved network ${NETWORK} as interface ${DEPEND_IFNAME}"
			else
				logger -p daemon.warn -t "fwknopd[$$]" "Cannot find interface for network ${NETWORK}, probably the network is not up"
			fi
		elif [ -n "${PCAP_INTF}" ]; then
			DEPEND_IFNAME="${PCAP_INTF}"
			logger -p daemon.debug -t "fwknopd[$$]" "Using configured PCAP_INTF interface ${DEPEND_IFNAME}"
		fi
	fi
}
