From 1a38dfdbde66c8ef55eef3b52a144b8a2d0ee18f Mon Sep 17 00:00:00 2001
From: Grant Limberg <grant.limberg@zerotier.com>
Date: Mon, 15 Jun 2020 13:51:24 -0700
Subject: [PATCH] back to go main

---
 CMakeLists.txt           | 41 ++++++++++----------------------
 cmd/zerotier/zerotier.go |  4 ----
 main.cpp                 | 51 ----------------------------------------
 3 files changed, 12 insertions(+), 84 deletions(-)
 delete mode 100644 main.cpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5048dd1ad..66c5cad89 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -62,6 +62,11 @@ if(CMAKE_BUILD_TYPE STREQUAL "Debug")
 	add_definitions(-DZT_DEBUG)
 endif(CMAKE_BUILD_TYPE STREQUAL "Debug")
 
+set(GOFLAGS
+	-trimpath 
+	-buildmode=pie 	
+)
+
 if(WIN32)
 	message("++ Setting Windows Compiler Flags ${CMAKE_BUILD_TYPE}")
 	add_definitions(-DNOMINMAX)
@@ -121,6 +126,7 @@ else(WIN32)
 			)
 			set(CMAKE_EXE_LINKER_FLAGS "-static ${CMAKE_EXE_LINKER_FLAGS}")
 			set(GOFLAGS 
+				${GOFLAGS}
 				-a 
 				-tags netgo 
 				-ldflags '-w -extldflags \"-static\"')
@@ -152,34 +158,11 @@ file(GLOB go_src
 	${CMAKE_SOURCE_DIR}/cmd/cmd/*.go
 	${CMAKE_SOURCE_DIR}/pkg/zerotier/*.go)
 
-add_custom_command(
-	OUTPUT ${CMAKE_BINARY_DIR}/zerotier_cgo.h ${CMAKE_BINARY_DIR}/zerotier_cgo.a
-	COMMAND ${GOARCH} CGO_ENABLED=1 ${GO} build -buildmode=c-archive ${GOFLAGS} -o ${CMAKE_BINARY_DIR}/zerotier_cgo.a ${CMAKE_SOURCE_DIR}/cmd/zerotier/zerotier.go
-	IMPLICIT_DEPENDS ${go_src}
+add_custom_target(
+	zerotier ALL
+	BYPRODUCTS ${CMAKE_BINARY_DIR}/zerotier
+	SOURCES ${go_src}
+	COMMAND ${GOARCH} CGO_ENABLED=1 CGO_LDFLAGS=\"$<TARGET_FILE:zt_osdep> $<TARGET_FILE:zt_core> $<TARGET_FILE:zt_controller> $<TARGET_FILE:zt_service_io_core>\" ${GO} build ${GOFLAGS} -o ${CMAKE_BINARY_DIR}/zerotier ${CMAKE_SOURCE_DIR}/cmd/zerotier/zerotier.go
 	COMMENT "Compiling Go Code..."
 )
-add_custom_target(
-	zerotier_cgo_target 
-	DEPENDS ${CMAKE_BINARY_DIR}/zerotier_cgo.a
-	SOURCES ${go_src}
-)
-add_library(zerotier_cgo STATIC IMPORTED GLOBAL)
-add_dependencies(zerotier_cgo zerotier_cgo_target)
-set_target_properties(
-	zerotier_cgo
-	PROPERTIES
-	IMPORTED_LOCATION ${CMAKE_BINARY_DIR}/zerotier_cgo.a
-	INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_BINARY_DIR}
-)
-
-add_executable(zerotier main.cpp)
-target_include_directories(zerotier PUBLIC ${CMAKE_BINARY_DIR})
-add_dependencies(zerotier zerotier_cgo zt_osdep zt_core zt_controller zt_service_io_core)
-target_link_libraries(zerotier zerotier_cgo zt_service_io_core zt_core zt_osdep zt_controller )
-if (APPLE)
-	target_link_libraries(zerotier "-framework CoreFoundation" "-framework Security")
-else(APPLE)
-	if ("${CMAKE_SYSTEM}" MATCHES "Linux")
-		target_link_libraries(zerotier "-lpthread" "-lm")
-	endif ("${CMAKE_SYSTEM}" MATCHES "Linux")
-endif (APPLE)
+add_dependencies(zerotier zt_osdep zt_core zt_controller zt_service_io_core)
diff --git a/cmd/zerotier/zerotier.go b/cmd/zerotier/zerotier.go
index d43fe97a3..2c8a855ce 100644
--- a/cmd/zerotier/zerotier.go
+++ b/cmd/zerotier/zerotier.go
@@ -52,10 +52,6 @@ func authTokenRequired(authToken string) {
 }
 
 func main() {
-}
-
-//export ZeroTierMain
-func ZeroTierMain() {
 	// Reduce Go's thread and memory footprint. This would slow things down if the Go code
 	// were doing a lot, but it's not. It just manages the core and is not directly involved
 	// in pushing a lot of packets around. If that ever changes this should be adjusted.
diff --git a/main.cpp b/main.cpp
deleted file mode 100644
index 18856e290..000000000
--- a/main.cpp
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * Copyright (c)2013-2020 ZeroTier, Inc.
- *
- * Use of this software is governed by the Business Source License included
- * in the LICENSE.TXT file in the project's root directory.
- *
- * Change Date: 2024-01-01
- *
- * On the date above, in accordance with the Business Source License, use
- * of this software will be governed by version 2.0 of the Apache License.
- */
-/****/
-
-#if !defined(_WIN32) && !defined(_WIN64)
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <stdio.h>
-#endif
-
-#include "zerotier_cgo.h"
-
-int main(int argc,char **argv)
-{
-	// Fork into background if run with 'service -d'. This is best done prior
-	// to launching the Go code, since Go likes to start thread pools and stuff
-	// that don't play nice with fork. This is obviously unsupported on Windows.
-#if !defined(_WIN32) && !defined(_WIN64)
-	for(int i=1;i<argc;) {
-		if (strcmp(argv[i++], "service") == 0) {
-			for(;i<argc;) {
-				if (strcmp(argv[i++], "-d") == 0) {
-					long p = (long)fork();
-					if (p < 0) {
-						fprintf(stderr,"FATAL: fork() failed!\n");
-						return -1;
-					} else if (p > 0) {
-						return 0;
-					}
-					break;
-				}
-			}
-			break;
-		}
-	}
-#endif
-
-	ZeroTierMain();
-
-	return 0;
-}