#!/bin/sh /etc/rc.common
# Copyright (C) 2008-2020 OpenWrt.org
# Copyright (C) 2022 ImmortalWrt.org

START=99
USE_PROCD=1

start_instance() {
	local cfg="$1"

	local type
	config_get type "$cfg" TYPE

	case "$type" in
	edge)
		local enabled
		config_get_bool enabled "$cfg" 'enabled' '0'
		[ "$enabled" = "1" ] || return 1

		local masquerade tunname mode ipaddr prefix mtu
		local supernode port second_supernode second_port
		local community key route
		config_get_bool masquerade "$cfg" 'masquerade' '0'
		config_get tunname "$cfg" 'tunname'
		config_get mode "$cfg" 'mode'
		config_get ipaddr "$cfg" 'ipaddr'
		config_get prefix "$cfg" 'prefix'
		config_get mtu "$cfg" 'mtu'
		config_get supernode "$cfg" 'supernode'
		config_get port "$cfg" 'port'
		config_get second_supernode "$cfg" 'second_supernode'
		config_get second_port "$cfg" 'second_port'
		config_get community "$cfg" 'community'
		config_get key "$cfg" 'key'
		config_get_bool route "$cfg" 'route' '0'

		local address
		address="$ipaddr/$prefix"
		[ "$mode" != 'dhcp' ] || address='0.0.0.0'

		procd_open_instance "edge_$cfg"
		procd_set_param command /usr/bin/n2n-edge -f
		procd_append_param command -u 0 -g 0
		procd_append_param command -d "$tunname"
		procd_append_param command -a "$mode:$address"
		procd_append_param command -c "$community"
		procd_append_param command -l "$supernode:$port"
		[ -z "$key" ] || procd_append_param command -k "$key"
		[ -z "$mtu" ] || procd_append_param command -M "$mtu"
		[ -z "$second_supernode" -o -z "$second_port" ] || procd_append_param command -l "$second_supernode:$second_port"
		[ "$route" = "0" ] || procd_append_param command -r

		procd_set_param stdout 1
		procd_set_param stderr 1
		procd_set_param respawn
		procd_close_instance

		iptables -I FORWARD -i "$tunname" -j ACCEPT -m comment --comment 'n2n edge eth'
		iptables -I FORWARD -o "$tunname" -j ACCEPT -m comment --comment 'n2n edge eth'
		[ "$masquerade" = "0" ] || iptables -t nat -I POSTROUTING -o "$tunname" -j MASQUERADE -m comment --comment 'n2n edge net'
	;;
	supernode)
		local enabled
		config_get_bool enabled "$cfg" 'enabled' '0'
		[ "$enabled" = "1" ] || return 1

		local port subnet
		config_get port "$cfg" 'port'
		config_get subnet "$cfg" 'subnet'

		procd_open_instance "supernode_$cfg"
		procd_set_param command /usr/bin/n2n-supernode -f
		procd_append_param command -p "$port"
		procd_append_param command -a "$subnet"

		procd_set_param stdout 1
		procd_set_param stderr 1
		procd_set_param respawn
		procd_close_instance

		iptables -I INPUT -p udp --dport $port -j ACCEPT -m comment --comment 'n2n supernode port'
	;;
	route)
		local enabled
		config_get_bool enabled "$cfg" 'enabled' '0'
		[ "$enabled" = "1" ] || return 1

		local ip mask gw
		config_get ip "$cfg" 'ip'
		config_get mask "$cfg" 'mask'
		config_get gw "$cfg" 'gw'
		route add -net "$ip/$mask" gw "$gw"
	;;
	esac
}

stop_instance() {
	local cfg="$1"

	local type
	config_get type "$cfg" TYPE

	case "$type" in
	edge)
		local tunname masquerade
		config_get tunname "$cfg" 'tunname'
		config_get_bool masquerade "$cfg" 'masquerade' '0'

		iptables -D FORWARD -i "$tunname" -j ACCEPT -m comment --comment 'n2n edge eth' 2>/dev/null
		iptables -D FORWARD -o "$tunname" -j ACCEPT -m comment --comment 'n2n edge eth' 2>/dev/null
		iptables -t nat -D POSTROUTING -o "$tunname" -j MASQUERADE -m comment --comment 'n2n edge net' 2>"/dev/null"
	;;
	supernode)
		local port
		config_get port "$cfg" 'port'

		iptables -D INPUT -p udp --dport "$port" -j ACCEPT -m comment --comment 'n2n supernode port' 2>"/dev/null"
	;;
	esac
}

start_service() {
	config_load 'n2n'
	config_foreach start_instance 'edge'
	config_foreach start_instance 'supernode'
	( sleep 2; config_foreach start_instance 'route'; ) &
}

stop_service() {
	config_load 'n2n'
	config_foreach stop_instance 'edge'
	config_foreach stop_instance 'supernode'
}

reload_service() {
	stop
	start
}

service_triggers() {
	procd_add_reload_trigger "n2n"
}