#!/bin/sh /etc/rc.common
# Copyright (c) 2011-2012 OpenWrt.org
START=80
. /lib/functions/network.sh
. /lib/functions/service.sh

start_6relayd() {
	local cfg="$1"
	local mode="$2"
	local args=""

	SERVICE_DAEMONIZE=1
	SERVICE_WRITE_PID=1
	SERVICE_PID_FILE="/var/run/6relayd-$cfg.pid"
	[ -f "$SERVICE_PID_FILE" ] && {
		if grep -q 6relayd "/proc/$(cat $SERVICE_PID_FILE)/cmdline"; then
			return 0
		else
			rm -f "$SERVICE_PID_FILE"
		fi
	}

	# Detect master interface
	local master masterif
	config_get masterif "$cfg" master
	network_get_device master "$masterif"
	[ -z "$master" ] && master="."

	# Detect slave interfaces
	local slaves=""
	local slaveifs
	config_get slaveifs "$cfg" network
	for slaveif in $slaveifs; do
		local slave
		network_get_device slave "$slaveif"
		# Compatibility with old config format
		if [ "$mode" = "relay" -a "$master" = "." ]; then
			[ -z "$slave" ] && return 0
			master="$slave"
		else
			[ -n "$slave" ] && append slaves "$slave"
			echo 1 > "/proc/sys/net/ipv6/conf/$slave/forwarding"
		fi
	done

	# Bail if no slaves are active
	[ -z "$slaves" ] && return 0

	# Configure services
	local rd dhcpv6 ndp
	config_get rd "$cfg" rd
	config_get dhcpv6 "$cfg" dhcpv6
	config_get ndp "$cfg" ndp

	# Test for fallback mode
	local fallback fallback_relay
	config_get fallback_relay "$cfg" fallback_relay

	if [ -n "$fallback_relay" -a "$master" != "." ]; then
		local prefix
		network_get_prefix6 prefix "$masterif"
		[ -z "$prefix" ] && fallback=1
	fi

	if [ -n "$fallback" ]; then
		for service in $fallback_relay; do
			eval "$service=relay"
		done
	fi

	# Configure feature options
	local always_rewrite_dns
	config_get_bool always_rewrite_dns "$cfg" always_rewrite_dns 0
	[ "$always_rewrite_dns" -eq 1 ] && append args "-n"

	local always_assume_default
	config_get_bool always_assume_default "$cfg" always_assume_default 0
	[ "$always_assume_default" -eq 1 ] && append args "-u"

	[ "$ndp" = "relay" ] && append args "-N -s -l"
	[ "$rd" = "relay" ] && append args "-Rrelay"
	[ "$rd" = "server" ] && append args "-Rserver"
	[ "$dhcpv6" = "relay" ] && append args "-Drelay"
	[ "$dhcpv6" = "server" ] && append args "-Dserver"
	[ "$ndp" != "relay" -a "$rd" != "relay" -a "$dhcpv6" != "relay" ] && master="."

	service_start /usr/sbin/6relayd $args $master $slaves
}

restart_affected_6relayd() {
	local cfg="$1"
	local net="$2"
	local mode="$3"

	local master slaves
	config_get master "$cfg" master
	config_get slaves "$cfg" network

	for iface in $master $slaves; do
		if [ "$iface" = "$net" ]; then
			SERVICE_PID_FILE="/var/run/6relayd-$cfg.pid"
			service_stop /usr/sbin/6relayd
			rm -f "$SERVICE_PID_FILE"
			start_6relayd "$cfg" "$mode"
		fi
	done
}

restart_affected() {
	local net="$1"
	config_load 6relayd
	config_foreach restart_affected_6relayd server "$net"
	config_foreach restart_affected_6relayd relay "$net" "relay"
}

stop() {
	for pid in /var/run/6relayd-*.pid; do
		SERVICE_PID_FILE="$pid"
		service_stop /usr/sbin/6relayd
		rm -f "$SERVICE_PID_FILE"
	done
}

start() {
	config_load 6relayd
	config_foreach start_6relayd server
	config_foreach start_6relayd relay relay
}