#!/bin/sh

VERBOSITY=0

start_stop_wpa_supplicant() {
	BRIDGE_WPA_IFACE="${1}"
	WPA_SUP_BIN="/usr/sbin/wpa_supplicant"
	WPA_SUP_PNAME="wpa_supplicant"
	WPA_SUP_PIDFILE="/var/run/wpa_supplicant.${BRIDGE_WPA_IFACE}.pid"
	WPA_SUP_OPTIONS="-B -P ${WPA_SUP_PIDFILE} -i ${BRIDGE_WPA_IFACE}"

	if [ -z "${IF_BRIDGE_WPA_DRIVER}" ]; then
		echo "${WPA_SUP_PNAME}: missing bridge_wpa_driver property for bridge interface ${IFACE}"
		exit 1
	fi

	case "${MODE}" in
	start)
		if [ "${VERBOSITY}" = "1" ]; then
			echo "${WPA_SUP_PNAME}: ${WPA_SUP_BIN} ${WPA_SUP_OPTIONS} -c ${IF_BRIDGE_WPA_CONF} -D ${IF_BRIDGE_WPA_DRIVER}"
		fi

		start-stop-daemon --start --quiet \
			--name ${WPA_SUP_PNAME} --startas ${WPA_SUP_BIN} --pidfile ${WPA_SUP_PIDFILE} \
			-- ${WPA_SUP_OPTIONS} -c ${IF_BRIDGE_WPA_CONF} -D ${IF_BRIDGE_WPA_DRIVER} -b ${IFACE}

		# Wait for wireless to be ready
		sleep 0.5
		;;
	stop)
		if [ "${VERBOSITY}" = "1" ]; then
			echo "${WPA_SUP_PNAME}: terminating ${WPA_SUP_PNAME} daemon"
		fi

		start-stop-daemon --stop --quiet \
			--name ${WPA_SUP_PNAME} --pidfile ${WPA_SUP_PIDFILE}
		;;
	esac
}

# Execute only if the interface has a bridge_ports property (this characterizes bridge interfaces)
case "$IF_BRIDGE_PORTS" in
    "")
        exit 0
        ;;
    none)
        INTERFACES=""
        ;;
    *)
        INTERFACES="$IF_BRIDGE_PORTS"
        ;;
esac

if [ "$MODE" = "start" ] && [ ! -d /sys/class/net/$IFACE ]; then
	# Create the bridge interface using brctl
	brctl addbr $IFACE || exit 1

	# For all the interfaces in bridge ports, attach to the bridge and remove ip
	for port in $INTERFACES; do
		if [ -d "/sys/class/net/${port}/wireless" ] && [ -n "${IF_BRIDGE_WPA_CONF}" ]; then
			# Launch wpa_supplicant with bridge support
			start_stop_wpa_supplicant ${port}
		fi

		# Turn up the interface and include in the bridge
		brctl addif $IFACE $port && ifconfig $port 0.0.0.0 up
	done

	# Setup the bridge (only options supported by busybox)
	[ -n "$IF_BRIDGE_AGEING" ] && brctl setageing $IFACE $IF_BRIDGE_AGEING
	[ -n "$IF_BRIDGE_BRIDGEPRIO" ] && brctl setbridgeprio $IFACE $IF_BRIDGE_BRIDGEPRIO
	[ -n "$IF_BRIDGE_FD" ] && brctl setfd $IFACE $IF_BRIDGE_FD
	[ -n "$IF_BRIDGE_HELLO" ] && brctl sethello $IFACE $IF_BRIDGE_HELLO
	[ -n "$IF_BRIDGE_MAXAGE" ] && brctl setmaxage $IFACE $IF_BRIDGE_MAXAGE
	[ -n "$IF_BRIDGE_PATHCOST" ] && brctl setpathcost $IFACE $IF_BRIDGE_PATHCOST
	[ -n "$IF_BRIDGE_PORTPRIO" ] && brctl setportprio $IFACE $IF_BRIDGE_PORTPRIO
	[ -n "$IF_BRIDGE_STP" ] && brctl stp $IFACE $IF_BRIDGE_STP

	# Activate the bridge
	ifconfig $IFACE 0.0.0.0 up

elif [ "$MODE" = "stop" ];  then
	# Bring down the interface
	ifconfig $IFACE down || exit 1

	# Remove port interfaces from the bridge
	for port in $INTERFACES; do
		if [ -d "/sys/class/net/${port}/wireless" ] && [ -n "${IF_BRIDGE_WPA_CONF}" ]; then
			# Stop the wpa_supplicant instance for the bridge
			start_stop_wpa_supplicant ${port}
		fi

		ifconfig $port down && brctl delif $IFACE $port
	done

	# Destroy the interface
	brctl delbr $IFACE
fi