natmap: add new package

NATMap is a program for opening port behind full cone NAT (NAT-1),
without the need for using UPnP or another port forward settings.

More details can be found at original repo: https://github.com/heiher/natmap

Signed-off-by: Richard Yu <yurichard3839@gmail.com>

net/natmap/Makefile

@@ -0,0 +1,40 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=natmap
+PKG_VERSION:=20221203
+PKG_RELEASE:=1
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://github.com/heiher/natmap/releases/download/$(PKG_VERSION)
+PKG_HASH:=c7aa0bb1f3e057bf1fa987ad6166ba7c2e80510a89593e04f4fe0f36f1873338
+
+PKG_MAINTAINER:=Richard Yu <yurichard3839@gmail.com>
+PKG_LICENSE:=MIT
+PKG_LICENSE_FILES:=License
+
+PKG_USE_MIPS16:=0
+PKG_BUILD_PARALLEL:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/natmap
+  SECTION:=net
+  CATEGORY:=Network
+  TITLE:=TCP/UDP port mapping tool for full cone NAT
+  URL:=https://github.com/heiher/natmap
+endef
+
+MAKE_FLAGS += REV_ID="$(PKG_VERSION)"
+
+define Package/natmap/install
+	$(INSTALL_DIR) $(1)/usr/bin
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/bin/natmap $(1)/usr/bin/
+	$(INSTALL_DIR) $(1)/usr/lib/natmap/
+	$(INSTALL_BIN) ./files/natmap-update.sh $(1)/usr/lib/natmap/update.sh
+	$(INSTALL_DIR) $(1)/etc/config/
+	$(INSTALL_CONF) ./files/natmap.config $(1)/etc/config/natmap
+	$(INSTALL_DIR) $(1)/etc/init.d/
+	$(INSTALL_BIN) ./files/natmap.init $(1)/etc/init.d/natmap
+endef
+
+$(eval $(call BuildPackage,natmap))

net/natmap/files/natmap-update.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+. /usr/share/libubox/jshn.sh
+
+(
+	json_init
+	json_add_string ip "$1"
+	json_add_int port "$2"
+	json_add_int inner_port "$4"
+	json_add_string protocol "$5"
+	json_dump > /var/run/natmap/$PPID.json
+)
+
+[ -n "${NOTIFY_SCRIPT}" ] && {
+	export -n NOTIFY_SCRIPT
+	exec "${NOTIFY_SCRIPT}" "$@"
+}

net/natmap/files/natmap.config

@@ -0,0 +1,13 @@
+config natmap
+	option enable '0'
+	option ipv4 '0'
+	option ipv6 '0'
+	option udp_mode '1'
+	option interface ''
+	option interval ''
+	option stun_server 'stun.stunprotocol.org'
+	option http_server 'example.com'
+	option port '8080'
+	option forward_target ''
+	option notify_script ''
+

net/natmap/files/natmap.init

@@ -0,0 +1,113 @@
+#!/bin/sh /etc/rc.common
+
+START=99
+USE_PROCD=1
+
+NAME=natmap
+PROG=/usr/bin/$NAME
+
+STATUS_PATH=/var/run/natmap
+
+load_interfaces() {
+	config_get interface "$1" interface
+	config_get enable "$1" enable 1
+
+	[ "${enable}" = "1" ] && interfaces=" ${interface} ${interfaces}"
+}
+
+validate_section_natmap() {
+	uci_load_validate "${NAME}" natmap "$1" "$2" \
+		'enable:bool:1' \
+		'ipv4:bool:0' \
+		'ipv6:bool:0' \
+		'udp_mode:bool:0' \
+		'interface:string' \
+		'interval:uinteger' \
+		'stun_server:host' \
+		'http_server:host' \
+		'port:port' \
+		'forward_target:host' \
+		'notify_script:file'
+}
+
+natmap_instance() {
+	[ "$2" = 0 ] || {
+		echo "validation failed"
+		return 1
+	}
+
+	[ "${enable}" = 0 ] && return 1
+
+	procd_open_instance "$1"
+	procd_set_param command "$PROG" \
+		${interval:+-k $interval} \
+		${stun_server:+-s "$stun_server"} \
+		${http_server:+-h "$http_server"}
+
+	[ "${ipv4}" = 1 ] && procd_append_param command -4
+	[ "${ipv6}" = 1 ] && procd_append_param command -6
+	[ "${udp_mode}" = 1 ] && procd_append_param command -u
+
+	[ -n "$interface" ] && {
+		local ifname
+
+		network_get_device ifname "$interface" || ifname="$interface"
+		procd_append_param command -i "$ifname"
+		procd_append_param netdev "$ifname"
+	}
+
+	if [ -n "$forward_target" ]; then
+		procd_append_param command -t "$forward_target" -p $port
+	else
+		procd_append_param command -b $port
+	fi
+
+	[ -n "${notify_script}" ] && procd_set_param env "NOTIFY_SCRIPT=${notify_script}"
+	procd_append_param command -e /usr/lib/natmap/update.sh
+
+	procd_set_param respawn
+	procd_set_param stdout 1
+	procd_set_param stderr 1
+
+	procd_close_instance
+}
+
+clear_status_files() {
+	find "${STATUS_PATH}" -type f -print0 | xargs -0 rm -f --
+}
+
+service_triggers() {
+	local interfaces
+
+	procd_add_reload_trigger "${NAME}"
+
+	config_load "${NAME}"
+	config_foreach load_interfaces natmap
+
+	[ -n "${interfaces}" ] && {
+		for n in $interfaces ; do
+			procd_add_reload_interface_trigger $n
+		done
+	}
+
+	procd_add_validation validate_section_natmap
+}
+
+start_service() {
+	. /lib/functions/network.sh
+
+	mkdir -p "${STATUS_PATH}"
+	clear_status_files
+
+	config_load "${NAME}"
+	config_foreach validate_section_natmap natmap natmap_instance
+}
+
+reload_service() {
+	stop
+	start
+}
+
+service_stopped() {
+	clear_status_files
+}

net/natmap/test.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+"$1" 2>&1 | grep "$2"