Implement experimental bridge for kvm virtual machines

.github/workflows/build-deploy.yml

@@ -13,13 +13,13 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v3
     - name: dependencies
       run: sudo apt-get update && sudo apt-get install gcc-mingw-w64 make
     - name: make
       run: make
     - name: artifact
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v3
       with:
         name: bridge
         path: build

.vscode/c_cpp_properties.json

@@ -5,13 +5,21 @@
             "includePath": [
                 "${workspaceFolder}/**"
             ],
-            "defines": [
-                "GIT_COMMIT",
-                "GIT_BRANCH"
-            ],
+            "defines": [],
             "cStandard": "c17",
             "cppStandard": "gnu++17",
             "intelliSenseMode": "windows-gcc-x64"
+        },
+        {
+            "name": "Linux",
+            "includePath": [
+                "${workspaceFolder}/**"
+            ],
+            "defines": [],
+            "cStandard": "c17",
+            "cppStandard": "gnu++17",
+            "intelliSenseMode": "linux-gcc-x64",
+            "compilerPath": "/usr/bin/gcc"
         }
     ],
     "version": 4

Makefile

@@ -1,10 +1,7 @@
 C_SOURCES = $(shell find ./ -type f -name '*.c')
 C_OBJECTS = $(C_SOURCES:.c=.o)
 
-GIT_COMMIT = $(shell git rev-parse --short HEAD)
-GIT_BRANCH = $(shell git rev-parse --abbrev-ref HEAD)
-
-CFLAGS = -std=c17 -Wno-int-conversion -DGIT_COMMIT='"$(GIT_COMMIT)"' -DGIT_BRANCH='"$(GIT_BRANCH)"'
+CFLAGS = -std=c17 -Wno-int-conversion
 LFLAGS = -lgdi32
 
 # DBGFLAGS = -Wl,--export-all-symbols -g -O0 -ggdb3 -Wall
@@ -15,6 +12,7 @@ build: $(C_OBJECTS)
 	$(info Linking)
 	x86_64-w64-mingw32-windres bridge.rc -O coff -o bridge.res
 	x86_64-w64-mingw32-gcc $(C_OBJECTS) bridge.res $(LFLAGS) $(DBGFLAGS) -o build/bridge.exe
+	gcc kvm.c -o build/rpc-bridge.elf
 
 %.o: %.c
 	$(info Compiling $<)

bridge.c

@@ -4,6 +4,8 @@
 #include <assert.h>
 #include <stdio.h>
 
+#include "bridge.h"
+
 #define __linux_read 3
 #define __linux_write 4
 #define __linux_open 5
@@ -64,7 +66,7 @@ void print(char const *fmt, ...);
 LPTSTR GetErrorMessage();
 extern BOOL RunningAsService;
 BOOL RetryNewConnection;
-BOOL IsLinux;
+OS_INFO OSInfo = {0};
 HANDLE hOut = NULL;
 HANDLE hIn = NULL;
 
@@ -102,7 +104,7 @@ static naked int darwin_syscall(int num,
 
 static inline int sys_read(int fd, void *buf, size_t count)
 {
-	if (IsLinux)
+	if (OSInfo.IsLinux)
 		return linux_syscall(__linux_read, fd, buf, count, 0, 0, 0);
 	else
 		return darwin_syscall(__darwin_read, fd, buf, count, 0, 0, 0);
@@ -110,7 +112,7 @@ static inline int sys_read(int fd, void *buf, size_t count)
 
 static inline int sys_write(int fd, const void *buf, size_t count)
 {
-	if (IsLinux)
+	if (OSInfo.IsLinux)
 		return linux_syscall(__linux_write, fd, buf, count, 0, 0, 0);
 	else
 		return darwin_syscall(__darwin_write, fd, buf, count, 0, 0, 0);
@@ -118,7 +120,7 @@ static inline int sys_write(int fd, const void *buf, size_t count)
 
 static inline int sys_open(const char *pathname, int flags, int mode)
 {
-	if (IsLinux)
+	if (OSInfo.IsLinux)
 		return linux_syscall(__linux_open, pathname, flags, mode, 0, 0, 0);
 	else
 		return darwin_syscall(__darwin_open, pathname, flags, mode, 0, 0, 0);
@@ -126,7 +128,7 @@ static inline int sys_open(const char *pathname, int flags, int mode)
 
 static inline int sys_close(int fd)
 {
-	if (IsLinux)
+	if (OSInfo.IsLinux)
 		return linux_syscall(__linux_close, fd, 0, 0, 0, 0, 0);
 	else
 		return darwin_syscall(__darwin_close, fd, 0, 0, 0, 0, 0);
@@ -134,25 +136,25 @@ static inline int sys_close(int fd)
 
 static inline unsigned int *sys_mmap(unsigned int *addr, size_t length, int prot, int flags, int fd, off_t offset)
 {
-	assert(IsLinux);
+	assert(OSInfo.IsLinux);
 	return linux_syscall(__linux_mmap2, addr, length, prot, flags, fd, offset);
 }
 
 static inline int sys_munmap(unsigned int *addr, size_t length)
 {
-	assert(IsLinux);
+	assert(OSInfo.IsLinux);
 	return linux_syscall(__linux_munmap, addr, length, 0, 0, 0, 0);
 }
 
 static inline int sys_socketcall(int call, unsigned long *args)
 {
-	assert(IsLinux);
+	assert(OSInfo.IsLinux);
 	return linux_syscall(__linux_socketcall, call, args, 0, 0, 0, 0);
 }
 
 static inline int sys_socket(int domain, int type, int protocol)
 {
-	if (IsLinux)
+	if (OSInfo.IsLinux)
 		return linux_syscall(__linux_socket, domain, type, protocol, 0, 0, 0);
 	else
 		return darwin_syscall(__darwin_socket, domain, type, protocol, 0, 0, 0);
@@ -160,7 +162,7 @@ static inline int sys_socket(int domain, int type, int protocol)
 
 static inline int sys_connect(int s, caddr_t name, socklen_t namelen)
 {
-	if (IsLinux)
+	if (OSInfo.IsLinux)
 		return linux_syscall(__linux_connect, s, name, namelen, 0, 0, 0);
 	else
 		return darwin_syscall(__darwin_connect, s, name, namelen, 0, 0, 0);
@@ -174,7 +176,7 @@ char *native_getenv(const char *name)
 	if (ret != 0)
 		return lpBuffer;
 
-	if (!IsLinux)
+	if (!OSInfo.IsLinux)
 	{
 		char *value = getenv(name);
 		if (value == NULL)
@@ -251,9 +253,9 @@ void ConnectToSocket(int fd)
 {
 	print("Connecting to socket\n");
 	const char *runtime;
-	if (IsLinux)
+	if (OSInfo.IsLinux)
 		runtime = native_getenv("XDG_RUNTIME_DIR");
-	else
+	else if (OSInfo.IsDarwin)
 	{
 		runtime = native_getenv("TMPDIR");
 		if (runtime == NULL)
@@ -278,34 +280,36 @@ void ConnectToSocket(int fd)
 			}
 		}
 	}
+	else
+	{
+		print("Unsupported OS\n");
+		ExitProcess(1);
+	}
 
 	print("IPC directory: %s\n", runtime);
 
 	/* TODO: check for multiple discord instances and create a pipe for each */
-	const char *discordUnixSockets[] = {
-		"%s/discord-ipc-%d",
-		"%s/app/com.discordapp.Discord/discord-ipc-%d",
-		"%s/.flatpak/dev.vencord.Vesktop/xdg-run/discord-ipc-%d",
-		"%s/snap.discord/discord-ipc-%d",
-		"%s/snap.discord-canary/discord-ipc-%d",
+	const char *discordUnixPipes[] = {
+		"/discord-ipc-0",
+		"/snap.discord/discord-ipc-0",
+		"/app/com.discordapp.Discord/discord-ipc-0",
 	};
 
 	struct sockaddr_un socketAddr;
 	socketAddr.sun_family = AF_UNIX;
+	char *pipePath = NULL;
+	int sockRet = -1;
 
-	int sockRet = 0;
-	for (int i = 0; i < sizeof(discordUnixSockets) / sizeof(discordUnixSockets[0]); i++)
+	for (int i = 0; i < sizeof(discordUnixPipes) / sizeof(discordUnixPipes[0]); i++)
 	{
-		size_t pipePathLen = strlen(runtime) + strlen(discordUnixSockets[i]) + 1;
-		char *pipePath = malloc(pipePathLen);
-
-		for (int j = 0; j < 16; j++)
-		{
-			snprintf(pipePath, pipePathLen, discordUnixSockets[i], runtime, j);
+		pipePath = malloc(strlen(runtime) + strlen(discordUnixPipes[i]) + 1);
+		strcpy(pipePath, runtime);
+		strcat(pipePath, discordUnixPipes[i]);
 		strcpy_s(socketAddr.sun_path, sizeof(socketAddr.sun_path), pipePath);
-			print("Probing %s\n", pipePath);
 
-			if (IsLinux)
+		print("Connecting to %s\n", pipePath);
+
+		if (OSInfo.IsLinux)
 		{
 			unsigned long socketArgs[] = {
 				(unsigned long)fd,
@@ -317,20 +321,11 @@ void ConnectToSocket(int fd)
 		else
 			sockRet = sys_connect(fd, (caddr_t)&socketAddr, sizeof(socketAddr));
 
-			print("    error: %d\n", sockRet);
+		free(pipePath);
 		if (sockRet >= 0)
 			break;
 	}
 
-		if (sockRet >= 0)
-		{
-			print("Connecting to %s\n", pipePath);
-			free(pipePath);
-			break;
-		}
-		free(pipePath);
-	}
-
 	if (sockRet < 0)
 	{
 		print("socketcall failed for: %d\n", sockRet);
@@ -492,6 +487,162 @@ void PipeBufferOutThread(LPVOID lpParam)
 	}
 }
 
+void COMPipeBufferInThread(LPVOID lpParam)
+{
+	bridge_thread *bt = (bridge_thread *)lpParam;
+	print("COM In thread started using COM port and pipe %#x\n", bt->hPipe);
+
+	HANDLE hComPort = CreateFile("\\\\.\\COM2", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
+	if (hComPort == INVALID_HANDLE_VALUE)
+	{
+		print("Failed to open COM2 port: %s\n", GetErrorMessage());
+		return;
+	}
+
+	int EOFCount = 0;
+	while (TRUE)
+	{
+		char buffer[BUFFER_LENGTH];
+		DWORD bytesRead;
+
+		if (!ReadFile(hComPort, buffer, sizeof(buffer), &bytesRead, NULL))
+		{
+			print("Failed to read from COM2 port: %s\n", GetErrorMessage());
+			Sleep(1000);
+			continue;
+		}
+
+		if (EOFCount > 4)
+		{
+			print("EOF count exceeded\n");
+			RetryNewConnection = TRUE;
+			TerminateThread(hOut, 0);
+			break;
+		}
+
+		if (bytesRead == 0)
+		{
+			print("EOF\n");
+			Sleep(1000);
+			EOFCount++;
+			continue;
+		}
+		EOFCount = 0;
+
+		print("Reading %d bytes from COM2 port: \"", bytesRead);
+		for (DWORD i = 0; i < bytesRead; i++)
+			print("%c", buffer[i]);
+		print("\"\n");
+
+		DWORD dwWritten;
+		if (!WriteFile(bt->hPipe, buffer, bytesRead, &dwWritten, NULL))
+		{
+			if (GetLastError() == ERROR_BROKEN_PIPE)
+			{
+				RetryNewConnection = TRUE;
+				print("In Broken pipe\n");
+				break;
+			}
+
+			print("Failed to write to pipe: %s\n", GetErrorMessage());
+			Sleep(1000);
+			continue;
+		}
+
+		while (dwWritten < bytesRead)
+		{
+			int last_written = dwWritten;
+			if (!WriteFile(bt->hPipe, buffer + dwWritten, bytesRead - dwWritten, &dwWritten, NULL))
+			{
+				if (GetLastError() == ERROR_BROKEN_PIPE)
+				{
+					RetryNewConnection = TRUE;
+					print("In Broken pipe\n");
+					break;
+				}
+
+				print("Failed to write to pipe: %s\n", GetErrorMessage());
+				Sleep(1000);
+				continue;
+			}
+
+			if (last_written == dwWritten)
+			{
+				print("Failed to write to pipe: %s\n", GetErrorMessage());
+				Sleep(1000);
+				continue;
+			}
+		}
+	}
+
+	CloseHandle(hComPort);
+}
+
+void COMPipeBufferOutThread(LPVOID lpParam)
+{
+	bridge_thread *bt = (bridge_thread *)lpParam;
+	print("COM Out thread started using COM port and pipe %#x\n", bt->hPipe);
+
+	HANDLE hComPort = CreateFile("\\\\.\\COM2", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
+	if (hComPort == INVALID_HANDLE_VALUE)
+	{
+		print("Failed to open COM2 port: %s\n", GetErrorMessage());
+		return;
+	}
+
+	while (TRUE)
+	{
+		char buffer[BUFFER_LENGTH];
+		DWORD dwRead;
+
+		if (!ReadFile(bt->hPipe, buffer, sizeof(buffer), &dwRead, NULL))
+		{
+			if (GetLastError() == ERROR_BROKEN_PIPE)
+			{
+				RetryNewConnection = TRUE;
+				print("Out Broken pipe\n");
+				break;
+			}
+
+			print("Failed to read from pipe: %s\n", GetErrorMessage());
+			Sleep(1000);
+			continue;
+		}
+
+		print("Writing %d bytes to COM2 port: \"", dwRead);
+		for (DWORD i = 0; i < dwRead; i++)
+			print("%c", buffer[i]);
+		print("\"\n");
+
+		DWORD bytesWritten;
+		if (!WriteFile(hComPort, buffer, dwRead, &bytesWritten, NULL))
+		{
+			print("Failed to write to COM2 port: %s\n", GetErrorMessage());
+			continue;
+		}
+
+		while (bytesWritten < dwRead)
+		{
+			int last_written = bytesWritten;
+			if (!WriteFile(hComPort, buffer + bytesWritten, dwRead - bytesWritten, &bytesWritten, NULL))
+			{
+				print("Failed to write to COM2 port: %s\n", GetErrorMessage());
+				Sleep(1000);
+				continue;
+			}
+
+			if (last_written == bytesWritten)
+			{
+				print("Failed to write to COM2 port: %s\n", GetErrorMessage());
+				Sleep(1000);
+				continue;
+			}
+		}
+	}
+
+	CloseHandle(hComPort);
+}
+
 void CreateBridge()
 {
 	LPCTSTR lpszPipename = TEXT("\\\\.\\pipe\\discord-ipc-0");
@@ -545,7 +696,49 @@ NewConnection:
 	print("Pipe connected\n");
 
 	int fd;
-	if (IsLinux)
+	if (!OSInfo.IsWine)
+	{
+		print("Running on Windows\n");
+		/* KVM, send 0xBB1569 and wait with timeout (TODO) for response 0xB41D6E */
+
+		print("Trying \\\\.\\COM2\n");
+		HANDLE hComPort = CreateFile("\\\\.\\COM2", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
+		assert(hComPort != INVALID_HANDLE_VALUE);
+		DWORD dwWritten;
+		print("Writing to COM port\n");
+		char buffer[4] = "\x69\x15\xBB";
+		assert(WriteFile(hComPort, buffer, sizeof(buffer), &dwWritten, NULL));
+		print("Wrote %d bytes to COM port\n", dwWritten);
+		DWORD dwRead;
+		print("Reading from COM port\n");
+		assert(ReadFile(hComPort, buffer, sizeof(buffer), &dwRead, NULL));
+		print("Read %d bytes from COM port\n", dwRead);
+
+		if (dwRead != 4 || memcmp(buffer, "\x6E\x1D\xB4", 4) != 0)
+		{
+			CloseHandle(hComPort);
+			print("Failed to connect to COM2\n");
+			return;
+		}
+
+		CloseHandle(hComPort);
+		print("Connected to COM2\n");
+
+		bridge_thread bt = {0, hPipe};
+
+		hIn = CreateThread(NULL, 0,
+						   (LPTHREAD_START_ROUTINE)COMPipeBufferInThread,
+						   (LPVOID)&bt,
+						   0, NULL);
+
+		hOut = CreateThread(NULL, 0,
+							(LPTHREAD_START_ROUTINE)COMPipeBufferOutThread,
+							(LPVOID)&bt,
+							0, NULL);
+	}
+	else
+	{
+		if (OSInfo.IsLinux)
 		{
 			unsigned long socketArgs[] = {
 				(unsigned long)AF_UNIX,
@@ -576,12 +769,14 @@ NewConnection:
 						   (LPTHREAD_START_ROUTINE)PipeBufferInThread,
 						   (LPVOID)&bt,
 						   0, NULL);
-	print("Created in thread %#lx\n", hIn);
 
 		hOut = CreateThread(NULL, 0,
 							(LPTHREAD_START_ROUTINE)PipeBufferOutThread,
 							(LPVOID)&bt,
 							0, NULL);
+	}
+
+	print("Created in thread %#lx\n", hIn);
 	print("Created out thread %#lx\n", hOut);
 
 	if (hIn == NULL || hOut == NULL)
@@ -612,6 +807,7 @@ NewConnection:
 			print("Failed to terminate thread: %s\n",
 				  GetErrorMessage());
 
+		if (OSInfo.IsWine)
 			sys_close(fd);
 		CloseHandle(hOut);
 		CloseHandle(hIn);

bridge.h

@@ -0,0 +1,13 @@
+#ifndef _BRIDGE_H
+#define _BRIDGE_H
+
+#include <windows.h>
+
+typedef struct _OS_INFO
+{
+	BOOL IsLinux;
+	BOOL IsDarwin;
+	BOOL IsWine;
+} OS_INFO;
+
+#endif // _BRIDGE_H

bridge.manifest

@@ -3,7 +3,7 @@
 <assemblyIdentity
 	version="1.0.0.0"
 	processorArchitecture="amd64"
-	name="com.enderice2.rpc-bridge"
+	name="EnderIce2.rpc-bridge"
 	type="win32"
 />
 <description>Simple bridge that allows you to use Discord Rich Presence with Wine games/software.</description>

build/bridge.sh

@@ -21,10 +21,10 @@ TEMP_PATH="$XDG_RUNTIME_DIR"
 TEMP_PATH=${TEMP_PATH:-"$TMPDIR"}
 
 VESSEL_PATH="$BRIDGE_PATH"
-IPC_PATHS="$TEMP_PATH /run/user/$UID $TEMP_PATH/app/com.discordapp.Discord $TEMP_PATH/.flatpak/dev.vencord.Vesktop/xdg-run $TEMP_PATH/snap.discord $TEMP_PATH/snap.discord-canary"
+IPC_PATHS="$TEMP_PATH /run/user/$UID $TEMP_PATH/snap.discord $TEMP_PATH/app/com.discordapp.Discord"
 for discord_ipc in $IPC_PATHS; do
-	if [ -S "$discord_ipc"/discord-ipc-? ]; then
-		VESSEL_PATH="$BRIDGE_PATH:$(echo "$discord_ipc"/discord-ipc-?)"
+	if [ -S "$discord_ipc"/discord-ipc-0 ]; then
+		VESSEL_PATH="$BRIDGE_PATH:$(echo "$discord_ipc"/discord-ipc-0)"
 		break
 	fi
 done

gui.c

@@ -4,6 +4,7 @@
 #include <assert.h>
 #include <stdio.h>
 
+#include "bridge.h"
 #include "resource.h"
 
 /**
@@ -17,7 +18,8 @@ void print(char const *fmt, ...);
 void InstallService(int ServiceStartType, LPCSTR Path);
 void RemoveService();
 void CreateBridge();
-extern BOOL IsLinux;
+extern OS_INFO OSInfo;
+extern char *logFilePath;
 
 HWND hwnd = NULL;
 HANDLE hBridge = NULL;
@@ -49,7 +51,7 @@ VOID HandleStartButton(BOOL Silent)
 		return;
 	}
 
-	SC_HANDLE hSCManager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
+	SC_HANDLE hSCManager = OpenSCManager(NULL, NULL, SC_MANAGER_CONNECT);
 	if (hSCManager == NULL)
 	{
 		print("OpenSCManager failed: %s\n", GetErrorMessage());
@@ -180,7 +182,7 @@ LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 			HandleRemoveButton();
 			break;
 		case IDM_VIEW_LOG:
-			ShellExecute(NULL, "open", "C:\\windows\\notepad.exe", "C:\\windows\\logs\\bridge.log", NULL, SW_SHOW);
+			ShellExecute(NULL, "open", "C:\\windows\\notepad.exe", logFilePath, NULL, SW_SHOW);
 			break;
 		case IDM_HELP_DOCUMENTATION:
 			ShellExecute(NULL, "open", "https://enderice2.github.io/rpc-bridge/index.html", NULL, NULL, SW_SHOWNORMAL);
@@ -191,14 +193,11 @@ LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 		case IDM_HELP_ABOUT:
 		{
 			char msg[256];
-			snprintf(msg, sizeof(msg),
-					 "rpc-bridge v%s\n"
-					 "  branch: %s\n"
-					 "  commit: %s\n\n"
+			sprintf(msg, "rpc-bridge v%s\n\n"
 						 "Simple bridge that allows you to use Discord Rich Presence with Wine games/software.\n\n"
 						 "Created by EnderIce2\n\n"
 						 "Licensed under the MIT License",
-					 VER_VERSION_STR, GIT_BRANCH, GIT_COMMIT);
+					VER_VERSION_STR);
 			MessageBox(NULL, msg, "About", MB_OK);
 			break;
 		}
@@ -232,13 +231,6 @@ VOID SetButtonStyles(INT *btnStartStyle, INT *btnRemoveStyle, INT *btnInstallSty
 	*btnRemoveStyle = WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON | WS_TABSTOP;
 	*btnInstallStyle = WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON | WS_TABSTOP;
 
-	// if (!IsLinux)
-	// {
-	// 	*btnInstallStyle |= WS_DISABLED;
-	// 	*btnRemoveStyle |= WS_DISABLED;
-	// 	return;
-	// }
-
 	SC_HANDLE hSCManager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 	SC_HANDLE schService = OpenService(hSCManager, "rpc-bridge", SERVICE_START | SERVICE_QUERY_STATUS);
 

kvm.c

@@ -0,0 +1,100 @@
+#if defined(__linux__)
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <signal.h>
+
+void transferData(int fromSock, int toSock)
+{
+	char buffer[256];
+	ssize_t bytesRead;
+	while ((bytesRead = read(fromSock, buffer, sizeof(buffer))) > 0)
+	{
+		write(toSock, buffer, bytesRead);
+	}
+}
+
+int connectToSocket(const char *socketPath)
+{
+	int sock = socket(AF_UNIX, SOCK_STREAM, 0);
+	assert(sock >= 0);
+
+	struct sockaddr_un addr;
+	memset(&addr, 0, sizeof(addr));
+	addr.sun_family = AF_UNIX;
+	strncpy(addr.sun_path, socketPath, sizeof(addr.sun_path) - 1);
+
+	int result = connect(sock, (struct sockaddr *)&addr, sizeof(addr));
+	assert(result == 0);
+
+	return sock;
+}
+
+int kvmSock;
+int discordSock;
+void sigintHandler(int sig)
+{
+	close(kvmSock);
+	close(discordSock);
+	exit(0);
+}
+
+int main()
+{
+	signal(SIGINT, sigintHandler);
+
+	const char *kvmSocketPath = "/tmp/kvm-rpc-bridge";
+	const char *discordSocketPath = getenv("XDG_RUNTIME_DIR");
+	if (discordSocketPath == NULL)
+	{
+		fprintf(stderr, "XDG_RUNTIME_DIR environment variable not set\n");
+		return EXIT_FAILURE;
+	}
+	char discordSocketFullPath[256];
+	snprintf(discordSocketFullPath, sizeof(discordSocketFullPath), "%s/discord-ipc-0", discordSocketPath);
+
+	printf("Trying Discord socket at %s\n", discordSocketFullPath);
+	discordSock = connectToSocket(discordSocketFullPath);
+	printf("Connected to Discord socket successfully\n");
+
+	// Connect to KVM socket
+	printf("Trying KVM socket at %s\n", kvmSocketPath);
+	kvmSock = connectToSocket(kvmSocketPath);
+
+	// Read specific message from KVM and send confirmation
+	const char kvmExpectedMsg[] = {0x69, 0x15, 0xBB};
+	const char kvmResponseMsg[] = {0x6E, 0x1D, 0xB4};
+
+	char buffer[3];
+	ssize_t bytesRead = read(kvmSock, buffer, sizeof(buffer));
+	printf("Read %ld bytes from KVM (%x %x %x)\n", bytesRead, buffer[0], buffer[1], buffer[2]);
+	assert(bytesRead == sizeof(kvmExpectedMsg));
+	assert(memcmp(buffer, kvmExpectedMsg, sizeof(kvmExpectedMsg)) == 0);
+
+	ssize_t bytesSent = write(kvmSock, kvmResponseMsg, sizeof(kvmResponseMsg));
+	assert(bytesSent == sizeof(kvmResponseMsg));
+	printf("Connected to KVM socket successfully\n");
+
+	// Transfer data between KVM and Discord sockets
+	if (fork() == 0)
+	{
+		// Child process: transfer data from KVM to Discord
+		transferData(kvmSock, discordSock);
+	}
+	else
+	{
+		// Parent process: transfer data from Discord to KVM
+		transferData(discordSock, kvmSock);
+	}
+
+	close(kvmSock);
+	close(discordSock);
+	return 0;
+}
+
+#endif // __linux__

main.c

@@ -3,10 +3,12 @@
 #include <assert.h>
 #include <stdio.h>
 
+#include "bridge.h"
 #include "resource.h"
 
 FILE *g_logFile = NULL;
 BOOL RunningAsService = FALSE;
+char *logFilePath = NULL;
 
 void CreateGUI();
 void CreateBridge();
@@ -15,7 +17,7 @@ void ServiceMain(int argc, char *argv[]);
 void InstallService(int ServiceStartType, LPCSTR Path);
 char *native_getenv(const char *name);
 void RemoveService();
-extern BOOL IsLinux;
+extern OS_INFO OSInfo;
 
 LPTSTR GetErrorMessage()
 {
@@ -57,11 +59,8 @@ void DetectWine()
 	}
 
 	if (!GetProcAddress(hNTdll, "wine_get_version"))
-	{
-		MessageBox(NULL, "This program is only intended to run under Wine.",
-				   GetErrorMessage(), MB_OK | MB_ICONINFORMATION);
-		ExitProcess(1);
-	}
+		return;
+	OSInfo.IsWine = TRUE;
 
 	static void(CDECL * wine_get_host_version)(const char **sysname, const char **release);
 	wine_get_host_version = (void *)GetProcAddress(hNTdll, "wine_get_host_version");
@@ -78,7 +77,8 @@ void DetectWine()
 			ExitProcess(1);
 	}
 
-	IsLinux = strcmp(__sysname, "Linux") == 0;
+	OSInfo.IsLinux = strcmp(__sysname, "Linux") == 0;
+	OSInfo.IsDarwin = strcmp(__sysname, "Darwin") == 0;
 }
 
 void print(char const *fmt, ...)
@@ -113,14 +113,13 @@ void HandleArguments(int argc, char *argv[])
 	}
 	else if (strcmp(argv[1], "--steam") == 0)
 	{
+		assert(OSInfo.IsWine == TRUE);
+
 		/* All this mess just so when you close the game,
 			it automatically closes the bridge and Steam
 			will not say that the game is still running. */
 
 		print("Running as Steam\n");
-		if (IsLinux == FALSE)
-			CreateBridge();
-
 		if (argc > 2)
 		{
 			if (strcmp(argv[2], "--no-service") == 0)
@@ -273,12 +272,12 @@ void HandleArguments(int argc, char *argv[])
 	}
 	else if (strcmp(argv[1], "--version") == 0)
 	{
-		/* Already shows the version */
+		printf("%s\n", VER_VERSION_STR);
 		ExitProcess(0);
 	}
 	else if (strcmp(argv[1], "--help") == 0)
 	{
-		print("Usage:\n"
+		printf("Usage:\n"
 			   "  %s [args]\n"
 			   "\n"
 			   "Arguments:\n"
@@ -312,16 +311,22 @@ void HandleArguments(int argc, char *argv[])
 int main(int argc, char *argv[])
 {
 	DetectWine();
-	char *logFilePath = "C:\\windows\\logs\\bridge.log";
+	if (OSInfo.IsWine)
+		logFilePath = "C:\\windows\\logs\\bridge.log";
+	else
+	{
+		logFilePath = (char *)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, MAX_PATH);
+		GetTempPath(MAX_PATH, logFilePath);
+		strcat_s(logFilePath, MAX_PATH, "bridge.log");
+	}
 	g_logFile = fopen(logFilePath, "w");
 	if (g_logFile == NULL)
 	{
-		MessageBox(NULL, "Failed to open logs file", "Error", MB_OK | MB_ICONERROR);
-		printf("Failed to open logs file: %ld\n", GetLastError());
+		printf("Failed to open logs file: %ld\n",
+			   GetLastError());
 		ExitProcess(1);
 	}
 
-	print("rpc-bridge v%s %s-%s\n", VER_VERSION_STR, GIT_BRANCH, GIT_COMMIT);
 	if (argc > 1)
 		HandleArguments(argc, argv);
 	else

resource.h

@@ -5,5 +5,5 @@
 #define IDM_HELP_ABOUT 40003
 #define IDM_VIEW_LOG 40004
 
-#define VER_VERSION 1, 3, 0, 0
-#define VER_VERSION_STR "1.3\0"
+#define VER_VERSION 1, 1, 0, 0
+#define VER_VERSION_STR "1.1\0"

service.c

@@ -8,7 +8,6 @@ SERVICE_STATUS_HANDLE g_StatusHandle = NULL;
 void print(char const *fmt, ...);
 void CreateBridge();
 LPTSTR GetErrorMessage();
-extern BOOL IsLinux;
 
 void WINAPI ServiceCtrlHandler(DWORD CtrlCode)
 {
@@ -88,14 +87,6 @@ void InstallService(int ServiceStartType, LPCSTR Path)
 {
 	print("Registering service\n");
 
-	// if (IsLinux == FALSE)
-	// {
-	// 	/* FIXME: I don't know how to get the TMPDIR without getenv */
-	// 	MessageBox(NULL, "Registering as a service is not supported on macOS at the moment.",
-	// 			   "Unsupported", MB_OK | MB_ICONINFORMATION);
-	// 	ExitProcess(1);
-	// }
-
 	SC_HANDLE schSCManager = OpenSCManager(NULL, NULL, SC_MANAGER_CREATE_SERVICE);
 	if (schSCManager == NULL)
 	{