From 3d8e8e25431d2feadf06e2061c316c1edc9c59ed Mon Sep 17 00:00:00 2001
From: Jerry Jacobs <jerry.jacobs@xor-gate.org>
Date: Mon, 29 Jul 2024 20:18:05 +0200
Subject: [PATCH] Detect FreeBSD linuxemu with syscall.Uname

---
 Makefile                           |  4 +--
 system.go                          |  2 ++
 system_unix.go => system_darwin.go |  7 +++--
 system_linux.go                    | 49 ++++++++++++++++++++++++++++++
 system_windows.go                  |  3 ++
 5 files changed, 60 insertions(+), 5 deletions(-)
 rename system_unix.go => system_darwin.go (64%)
 create mode 100644 system_linux.go

diff --git a/Makefile b/Makefile
index 10433bd..d477a42 100644
--- a/Makefile
+++ b/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 $@
diff --git a/system.go b/system.go
index cba3b79..9202676 100644
--- a/system.go
+++ b/system.go
@@ -156,6 +156,8 @@ func systemIgnoreAllSignals() {
 }
 
 func systemOSDetect() {
+	systemGetUname()
+
 	wineVersion := systemGetWINEVersion()
 	log.Println("WINE version", wineVersion)
 	log.Println("IsUserRoot", systemIsUserRoot())
diff --git a/system_unix.go b/system_darwin.go
similarity index 64%
rename from system_unix.go
rename to system_darwin.go
index dbdd769..2374007 100644
--- a/system_unix.go
+++ b/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
diff --git a/system_linux.go b/system_linux.go
new file mode 100644
index 0000000..5e4deb0
--- /dev/null
+++ b/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
+}
diff --git a/system_windows.go b/system_windows.go
index e7cce7c..f730b67 100644
--- a/system_windows.go
+++ b/system_windows.go
@@ -26,6 +26,9 @@ func systemGetWINEVersion() string {
 	return wineVersion
 }
 
+func systemGetUname() {
+}
+
 func systemIsUserRoot() bool {
 	root := true