kcptun: add new package

kcptun is a stable & secure tunnel based on kcp with N:M multiplexing.
https://github.com/xtaci/kcptun

Signed-off-by: Dengfeng Liu <liudf0716@gmail.com>

net/kcptun/Makefile

@@ -0,0 +1,74 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=kcptun
+PKG_VERSION:=20190725
+PKG_RELEASE:=1
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://codeload.github.com/xtaci/kcptun/tar.gz/v${PKG_VERSION}?
+PKG_HASH:=65c0d0d4f7e3bb3c3b91e23ff2eb6621455d6d376a4f17e6fb2017337ce711c1
+
+PKG_MAINTAINER:=Dengfeng Liu <liudf0716@gmail.com>
+PKG_LICENSE:=MIT
+PKG_LICENSE_FILES:=LICENSE
+
+PKG_BUILD_DEPENDS:=golang/host
+PKG_BUILD_PARALLEL:=1
+PKG_USE_MIPS16:=0
+
+GO_PKG:=github.com/xtaci/kcptun
+
+include $(INCLUDE_DIR)/package.mk
+include ../../lang/golang/golang-package.mk
+
+define Package/kcptun/template
+  SECTION:=net
+  CATEGORY:=Network
+  SUBMENU:=Web Servers/Proxies
+  TITLE:=KCP-based Secure Tunnel 
+  URL:=https://github.com/xtaci/kcptun
+  DEPENDS:=$(GO_ARCH_DEPENDS)
+endef
+
+define Package/kcptun-c
+  $(call Package/kcptun/template)
+  TITLE+= (client)
+endef
+
+define Package/kcptun-s
+  $(call Package/kcptun/template)
+  TITLE+= (server)
+endef
+
+define Package/kcptun/description
+  kcptun is a Stable & Secure Tunnel Based On KCP with N:M Multiplexing
+endef
+Package/kcptun-c/description = $(Package/kcptun/description)
+Package/kcptun-s/description = $(Package/kcptun/description)
+
+GO_PKG_LDFLAGS_X:=main.VERSION=$(PKG_VERSION)
+GO_PKG_LDFLAGS:=-s -w
+
+define Package/kcptun/install
+	$(call GoPackage/Package/Install/Bin,$(PKG_INSTALL_DIR))
+
+	$(INSTALL_DIR) $(1)/usr/bin/
+	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/$(2) $(1)/usr/bin/$(3)
+	$(INSTALL_DIR) $(1)/etc/config/
+	$(INSTALL_CONF) ./files/$(3).conf $(1)/etc/config/$(3)
+	$(INSTALL_DIR) $(1)/etc/init.d/
+	$(INSTALL_BIN) ./files/$(3).init $(1)/etc/init.d/$(3)
+endef
+
+define Package/kcptun-c/install
+  $(call Package/kcptun/install,$(1),client,kcptun-c)
+endef
+
+define Package/kcptun-s/install
+  $(call Package/kcptun/install,$(1),server,kcptun-s)
+endef
+
+$(eval $(call GoBinPackage,kcptun-c))
+$(eval $(call BuildPackage,kcptun-c))
+$(eval $(call GoBinPackage,kcptun-s))
+$(eval $(call BuildPackage,kcptun-s))

net/kcptun/files/kcptun-c.conf

@@ -0,0 +1,9 @@
+config kcptun
+	option local_port 12948 # this port should be your service port
+	option remote_ip 'your vps ip'
+	option remote_port 29900 
+	option mode 'fast'
+	option nocomp 1
+	option sndwnd 128
+	option rcvwnd 512
+	option disabled 1 # set 0 to enable it

net/kcptun/files/kcptun-c.init

@@ -0,0 +1,56 @@
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2019 Dengfeng Liu
+
+START=99
+
+USE_PROCD=1
+NAME=kcptun-c
+PROG=/usr/bin/${NAME}
+
+validate_section_kcptun() 
+{
+	uci_load_validate "${NAME}" kcptun "$1" "$2" \
+		'local_port:port' \
+		'remote_ip:string' \
+		'remote_port:port' \
+		'mode:string' \
+		'nocomp:bool' \
+		'sndwnd:uinteger' \
+		'rcvwnd:uinteger' \
+		'disabled:bool'
+}
+
+kcptun_instance() 
+{
+	[ "$2" = 0 ] || {
+		echo "validation failed"
+		return 1
+	}
+
+	[ "${disabled}" = "1" ] && return 1
+
+	[ "${local_port}" -gt 0 ] && [ "${local_port}" -lt 65536 ] || return 1
+
+	[ "${remote_port}" -gt 0 ] && [ "${remote_port}" -lt 65536 ] || return 1
+
+	[ -n "${remote_ip}" ] || {
+		return 1
+	}
+
+	procd_open_instance
+	procd_set_param command "${PROG}"
+	procd_append_param command --localaddr ":${local_port}"
+	procd_append_param command --remoteaddr "${remote_ip}:${remote_port}"
+	[ -n "${mode}" ] && procd_append_param command --mode "${mode}"
+	[ "${nocomp}" -eq 1 ] && procd_append_param command --nocomp
+	[ "${sndwnd}" -gt 0 ] && procd_append_param command --sndwnd "${sndwnd}"
+	[ "${rcvwnd}" -gt 0 ] && procd_append_param command --rcvwnd "${rcvwnd}"
+	procd_set_param respawn
+	procd_close_instance
+}
+
+start_service() 
+{
+	config_load "${NAME}"
+	config_foreach validate_section_kcptun kcptun kcptun_instance
+}

net/kcptun/files/kcptun-s.conf

@@ -0,0 +1,9 @@
+config kcptun
+	option local_port 29900
+	option target_ip '127.0.0.1'
+	option target_port 12948 # this port should be your service port
+	option mode 'fast'
+	option nocomp 1
+	option sndwnd 1024
+	option rcvwnd 1024
+	option disabled 1 # set 0 to enable it

net/kcptun/files/kcptun-s.init

@@ -0,0 +1,56 @@
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2019 Dengfeng Liu
+
+START=99
+
+USE_PROCD=1
+NAME=kcptun-s
+PROG=/usr/bin/${NAME}
+
+validate_section_kcptun() 
+{
+	uci_load_validate "${NAME}" kcptun "$1" "$2" \
+		'local_port:port' \
+		'target_ip:string' \
+		'target_port:port' \
+		'mode:string' \
+		'nocomp:bool' \
+		'sndwnd:uinteger' \
+		'rcvwnd:uinteger' \
+		'disabled:bool'
+}
+
+kcptun_instance() 
+{
+	[ "$2" = 0 ] || {
+		echo "validation failed"
+		return 1
+	}
+
+	[ "${disabled}" = "1" ] && return 1
+
+	[ "${local_port}" -gt 0 ] && [ "${local_port}" -lt 65536 ] || return 1
+
+	[ "${target_port}" -gt 0 ] && [ "${target_port}" -lt 65536 ] || return 1
+	
+	[ -n "${target_ip}" ] || {
+		return 1
+	}
+
+	procd_open_instance
+	procd_set_param command "${PROG}"
+	procd_append_param command --listen ":${local_port}"
+	procd_append_param command --target "${target_ip}:${target_port}"
+	[ -n "${mode}" ] && procd_append_param command --mode "${mode}"
+	[ "${nocomp}" -eq 1 ] && procd_append_param command --nocomp
+	[ "${sndwnd}" -gt 0 ] && procd_append_param command --sndwnd "${sndwnd}"
+	[ "${rcvwnd}" -gt 0 ] && procd_append_param command --rcvwnd "${rcvwnd}"
+	procd_set_param respawn
+	procd_close_instance
+}
+
+start_service() 
+{
+	config_load "${NAME}"
+	config_foreach validate_section_kcptun kcptun kcptun_instance
+}