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

START=99
USE_PROCD=1
PROG=/usr/sbin/omcproxy

# Uncomment to enable verbosity 
#OPTIONS="-v" 
PROXIES=""


omcproxy_add_proxy() {
	local uplink downlink scope proxy
	config_get uplink $1 uplink
	config_get downlink $1 downlink
	config_get scope $1 scope

	proxy=""

	network_get_device updev $uplink
	[ -n "$updev" ] || return 0

	for network in $downlink; do
		network_get_device downdev $network
		[ -n "$downdev" ] && proxy="$proxy,$downdev"

		# Disable in-kernel querier while ours is active
		[ -f /sys/class/net/$downdev/bridge/multicast_querier ] && \
			echo 0 > /sys/class/net/$downdev/bridge/multicast_querier
	done

	[ -n "$proxy" ] || return 0
	[ -n "$scope" ] && proxy="$proxy,scope=$scope"

	PROXIES="$PROXIES $updev$proxy"

}

omcproxy_add_trigger() {
	local uplink downlink
	config_get uplink $1 uplink
	config_get downlink $1 downlink

	for network in $uplink $downlink; do
		procd_add_interface_trigger "interface.*" $network /etc/init.d/omcproxy restart
	done
}

omcproxy_add_firewall() {
	config_get uplink $1 uplink
	config_get downlink $1 downlink

	upzone=$(fw3 -q network $uplink 2>/dev/null)
	[ -n "$upzone" ] || return 0

	json_add_object ""
	json_add_string type rule
	json_add_string src "$upzone"
	json_add_string proto igmp
	json_add_string target ACCEPT
	json_close_object

	json_add_object ""
	json_add_string type rule
	json_add_string family ipv6
	json_add_string src "$upzone"
	json_add_string proto icmp
	json_add_string src_ip fe80::/10
	json_add_array icmp_type
		json_add_string "" 130/0
		json_add_string "" 131/0
		json_add_string "" 132/0
		json_add_string "" 143/0
	json_close_array
	json_add_string target ACCEPT
	json_close_object

	for network in $downlink; do
		downzone=$(fw3 -q network $network 2>/dev/null)
		[ -n "$downzone" ] || continue

		json_add_object ""
		json_add_string type rule
		json_add_string src "$upzone"
		json_add_string dest "$downzone"
		json_add_string family ipv4
		json_add_string proto any
		json_add_string dest_ip "224.0.0.0/4"
		json_add_string target ACCEPT
		json_close_object

		json_add_object ""
		json_add_string type rule
		json_add_string src "$upzone"
		json_add_string dest "$downzone"
		json_add_string family ipv6
		json_add_string proto any
		json_add_string dest_ip "ff00::/8"
		json_add_string target ACCEPT
		json_close_object
	done
}

service_triggers() {
	procd_add_reload_trigger "omcproxy"
}

start_service() {
	include /lib/functions

	config_load omcproxy
	config_foreach omcproxy_add_proxy proxy

	[ -n "$PROXIES" ] || return 0

	procd_open_instance
	procd_set_param command $PROG
	[ -n "$OPTIONS" ] && procd_append_param command $OPTIONS
	procd_append_param command $PROXIES
	procd_set_param respawn

	procd_open_trigger
	config_foreach omcproxy_add_trigger proxy
	procd_close_trigger

	procd_open_data

	json_add_array firewall
	config_foreach omcproxy_add_firewall proxy
	json_close_array

	procd_close_data

	procd_close_instance

	# Increase maximum IPv4 group memberships per socket
	echo 128 > /proc/sys/net/ipv4/igmp_max_memberships
}

service_started() {
	procd_set_config_changed firewall
}