Detect FreeBSD linuxemu with syscall.Uname

Makefile

@@ -1,4 +1,4 @@
-SOURCES=Makefile main.go main_release.go main_debug.go config.go config_release.go config_template.go system.go system_windows.go system_unix.go
+SOURCES=Makefile main.go main_release.go main_debug.go config.go config_release.go config_template.go system.go system_windows.go system_linux.go system_darwin.go
 GARBLE_BIN = $(shell go env GOPATH)/bin/garble
 GARBLE_CMD = $(GARBLE_BIN) -literals -tiny
 
@@ -14,7 +14,7 @@ test: socks5-ssh-proxy
 test-release: socks5-ssh-proxy.release
 	./socks5-ssh-proxy.release
 socks5-ssh-proxy: $(SOURCES) 
-	go build -o $@
+	GOOS=linux GOARCH=amd64 go build -tags release,linux -o $@
 socks5-ssh-proxy.release: resources $(SOURCES) $(GARBLE_BIN)
 	GOOS=darwin GOARCH=amd64 $(GARBLE_CMD) build -tags release -o $@
 	upx $@

system.go

@@ -156,6 +156,8 @@ func systemIgnoreAllSignals() {
 }
 
 func systemOSDetect() {
+	systemGetUname()
+
 	wineVersion := systemGetWINEVersion()
 	log.Println("WINE version", wineVersion)
 	log.Println("IsUserRoot", systemIsUserRoot())

system_darwin.go

@@ -1,13 +1,14 @@
-//go:build !windows
-// +build !windows
+//go:build darwin 
+// +build darwin
 
-//
 package main
 
 func systemGetWINEVersion() string {
 	return ""
 }
 
+func systemGetUname() {
+}
 
 func systemIsUserRoot() bool {
 	return false

system_linux.go

@@ -0,0 +1,49 @@
+//go:build linux
+// +build linux
+
+package main
+
+import (
+	"log"
+	"syscall"
+	"strings"
+)
+
+func systemGetWINEVersion() string {
+	return ""
+}
+
+func systemGetUname() {
+	var uts syscall.Utsname
+
+	err := syscall.Uname(&uts)
+	if err != nil {
+		log.Println("Error getting system information:", err)
+		return
+	}
+
+	// Convert the byte arrays to strings
+	sysname := int8SliceToString(uts.Sysname[:])
+	release := int8SliceToString(uts.Release[:])
+	version := int8SliceToString(uts.Version[:])
+
+	// Check for FreeBSD Linux emulation specific indicators
+	log.Println("syscall.Uname:", "(sysname)", sysname, "(release)", release, "(version)", version)
+	if strings.Contains(sysname, "Linux") && strings.Contains(version, "FreeBSD") {
+		log.Println("Running under FreeBSD linuxemu")
+	}
+}
+
+// int8SliceToString converts a slice of int8 to a string.
+func int8SliceToString(int8Slice []int8) string {
+	// Create a byte slice with the same length as the int8 slice
+	byteSlice := make([]byte, len(int8Slice))
+	for i, v := range int8Slice {
+		byteSlice[i] = byte(v)
+	}
+	return string(byteSlice)
+}
+
+func systemIsUserRoot() bool {
+	return false
+}

system_windows.go

@@ -26,6 +26,9 @@ func systemGetWINEVersion() string {
 	return wineVersion
 }
 
+func systemGetUname() {
+}
+
 func systemIsUserRoot() bool {
 	root := true