#!/bin/sh

. /lib/functions.sh
. /lib/functions/network.sh

PIDPATH=/var/run
tunnel_id=0

missing() {
	logger -t td-client "Not starting tunneldigger \"$1\" - missing $2" >&2
}

handle_td_ifup() {
	local cfg=$1
	local enabled
	local addresses
	local uuid
	local interface
	local group
	local limit_bw_down
	local hook_script
	local bind_interface
	local broker_selection


	config_get_bool enabled "$cfg" enabled 1
	config_get addresses "$cfg" address
	config_get uuid "$cfg" uuid
	config_get interface "$cfg" interface
	config_get group "$cfg" group
	config_get limit_bw_down "$cfg" limit_bw_down
	config_get hook_script "$cfg" hook_script
	config_get bind_interface "$cfg" bind_interface
	config_get broker_selection "$cfg" broker_selection

	let tunnel_id++

	[ $enabled -eq 0 ] && return

	[ "$INTERFACE" != "${bind_interface}" ] && return

	local broker_opts=""
	local address
	for address in $addresses; do
		append broker_opts "-b ${address}"
	done

	[ ! -z "${limit_bw_down}" ] && append broker_opts "-L ${limit_bw_down}"
	[ ! -z "${hook_script}" ] && append broker_opts "-s ${hook_script}"
	[ ! -z "${bind_interface}" ] && {
		# Resolve logical interface name.
		unset _bind_interface
		network_get_device _bind_interface "${bind_interface}" || _bind_interface="${bind_interface}"
		append broker_opts "-I ${_bind_interface}"
	}
	[ ! -z "${broker_selection}" ] && {
		# Set broker selection.
		case "${broker_selection}" in
			usage)
				append broker_opts "-a"
			;;
			first)
				append broker_opts "-g"
			;;
			random)
				append broker_opts "-r"
			;;
		esac
	}

	if [ -z "$uuid" ]; then
		missing $cfg uuid
		return
	elif [ -z "$interface" ]; then
		missing $cfg interface
		return
	fi

	logger -t td-client "Starting tunneldigger \"$cfg\" on ${interface}"
	/sbin/start-stop-daemon -S -q -b -m -c root:${group} -p ${PIDPATH}/tunneldigger.${interface}.pid -x /usr/bin/tunneldigger -- -u ${uuid} -i ${interface} -t ${tunnel_id} ${broker_opts}
}

handle_td_ifdown() {
	local cfg=$1
	local enabled
	local interface
	local bind_interface

	config_get_bool enabled "$cfg" enabled 1
	config_get interface "$cfg" interface
	config_get bind_interface "$cfg" bind_interface

	if [ "$INTERFACE" = "${bind_interface}" ]; then
		local PIDFILE=${PIDPATH}/tunneldigger.${interface}.pid
		local PID="$(cat ${PIDFILE})"
		logger -t td-client "Stopping tunneldigger \"$cfg\" on ${interface} PIDFILE=${PIDFILE}"
		/sbin/start-stop-daemon -K -q -p $PIDFILE
		while test -d "/proc/${PID}"; do
			logger -t td-client "  waiting for tunneldigger to stop"
			sleep 1
		done
		logger -t td-client "  tunneldigger stopped"
	fi
}

config_load tunneldigger
if [ "$ACTION" = ifup ]; then
	config_foreach handle_td_ifup broker
fi

if [ "$ACTION" = ifdown ]; then
	config_foreach handle_td_ifdown broker
fi