#!/bin/sh /etc/rc.common
# Copyright (C) 2010-2014 OpenWrt.org

START=99
USE_PROCD=1
PROG=/usr/sbin/igmpproxy
CONFIGFILE=/var/etc/igmpproxy.conf

igmp_header() {
	local quickleave verbose
	config_get_bool quickleave "$1" quickleave 0
	config_get verbose "$1" verbose 1

	[ $verbose = "1" ] && logopts="-v"
	[ $verbose = "2" ] && logopts="-vv"
	[ $verbose = "3" ] && logopts="-vvv"
	[ $verbose = "4" ] && logopts="-vvvv"

	mkdir -p /var/etc
	rm -f /var/etc/igmpproxy.conf
	[ $quickleave -gt 0 ] && echo "quickleave" >> /var/etc/igmpproxy.conf

	[ -L /etc/igmpproxy.conf ] || ln -nsf /var/etc/igmpproxy.conf /etc/igmpproxy.conf
}

igmp_add_phyint() {
	local network direction altnets device up

	config_get network $1 network
	config_get direction $1 direction
	config_get altnets $1 altnet

	local status="$(ubus -S call "network.interface.$network" status)"
	[ -n "$status" ] || return

	json_load "$status"
	json_get_var device l3_device
	json_get_var up up

	[ -n "$device" -a "$up" = "1" ] || {
		procd_append_param error "$network is not up"
		return;
	}

	append netdevs "$device"

	local opts=" ratelimit 0 threshold 1"
	[ "$direction" = "disabled" ] && opts=""

	[ "$direction" = "upstream" ] && has_upstream=1

	echo -e "\nphyint $device $direction$opts" >> /var/etc/igmpproxy.conf

	if [ -n "$altnets" ]; then
		local altnet
		for altnet in $altnets; do
			echo -e "\taltnet $altnet" >> /var/etc/igmpproxy.conf
		done
	fi
}

igmp_add_network() {
	local network

	config_get network $1 network
	procd_add_interface_trigger "interface.*" $network /etc/init.d/igmpproxy reload
}

igmp_add_firewall_routing() {
	config_get direction $1 direction
	config_get zone $1 zone

	if [ "$direction" != "downstream" ] || [ -z "$zone" ]; then
		return 0
	fi

# First drop SSDP packets then accept all other multicast

	json_add_object ""
	json_add_string type rule
	json_add_string src "$upstream"
	json_add_string dest "$zone"
	json_add_string family ipv4
	json_add_string proto udp
	json_add_string dest_ip "239.255.255.250"
	json_add_string target DROP
	json_close_object

	json_add_object ""
	json_add_string type rule
	json_add_string src "$upstream"
	json_add_string dest "$zone"
	json_add_string family ipv4
	json_add_string proto udp
	json_add_string dest_ip "224.0.0.0/4"
	json_add_string target ACCEPT
	json_close_object
}

igmp_add_firewall_network() {
	config_get direction $1 direction
	config_get zone $1 zone

	[ ! -z "$zone" ] || return

	json_add_object ""
	json_add_string type rule
	json_add_string src "$zone"
	json_add_string family ipv4
	json_add_string proto igmp
	json_add_string target ACCEPT
	json_close_object

	[ "$direction" = "upstream" ] && {
		upstream="$zone"
		config_foreach igmp_add_firewall_routing phyint
	}
}

service_triggers() {
	procd_add_reload_trigger "igmpproxy"
	config_foreach igmp_add_network phyint
}

start_service() {
	has_upstream=
	netdevs=
	logopts=
	config_load igmpproxy

	config_foreach igmp_header igmpproxy
	config_foreach igmp_add_phyint phyint
	[ -n "$has_upstream" ] || return

	procd_open_instance
	procd_set_param command $PROG '-n'
	[ -n "$logopts" ] && procd_append_param command $logopts
	procd_append_param command $CONFIGFILE
	procd_set_param file $CONFIGFILE
	procd_set_param netdev $netdevs
	procd_set_param respawn

	procd_open_data

	json_add_array firewall
	config_foreach igmp_add_firewall_network phyint
	json_close_array

	procd_close_data

	procd_close_instance
}

service_started() {
	procd_set_config_changed firewall
}

stop_service() {
	procd_set_config_changed firewall
}
