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

resolve_ifname() {
	grep -qs "^ *$1:" /proc/net/dev && {
		append ifaces "$1"
	}
}

resolve_network() {
	local ifn
	fixup_interface "$1"
	config_get ifn "$1" ifname
	[ -z "$ifn" ] && return 1
	resolve_ifname "$ifn"
}

start_6relayd() {
	local cfg="$1"

	local args="-S"
	local ifaces=""

	config_get proto "$cfg" proto
	[[ "$proto" == 6relay ]] || return 0

	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
	}

	local net networks
	config_get networks "$cfg" network
	for net in $networks; do
		resolve_network "$net" || {
			return 1
		}
	done

	local ifn ifnames
	config_get ifnames "$cfg" ifname
	for ifn in $ifnames; do
		resolve_ifname "$ifn"
	done

	local forward_rd # = 1
	config_get_bool forward_rd "$cfg" forward_rd 1
	[ $forward_rd -eq 1 ] && append args "-R"

	local forward_dhcpv6 # = 1
	local forward_dhcpv6_mode # = relay
	config_get_bool forward_dhcpv6 "$cfg" forward_dhcpv6 1
	config_get forward_dhcpv6_mode "$cfg" forward_dhcpv6_mode
	[ $forward_dhcpv6 -eq 1 ] && append args "-D$forward_dhcpv6_mode"

	local forward_ndp # = 1
	config_get_bool forward_ndp "$cfg" forward_ndp 1
	[ $forward_ndp -eq 1 ] && append args "-N"

	local configure_routes # = 1
	config_get_bool configure_routes "$cfg" configure_routes 1
	[ $configure_routes -eq 1 ] && append args "-r"

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

	service_start /usr/sbin/6relayd $args $ifaces
}

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() {
	include /lib/network
	config_load network
	config_foreach start_6relayd interface
}