Potential fix for issue 26, but needs some GUI integration

cmake/CMakeLists_config.txt

@@ -183,6 +183,8 @@ IF(UNIX)
 
 ELSE(UNIX)
 
+	LIST(APPEND libs Wtsapi32 Userenv)
+
 	ADD_DEFINITIONS(
 		/DWIN32
 		/D_WINDOWS

cmake/CMakeLists_lib.txt

@@ -204,6 +204,7 @@ SET(src_lib_platform_mswindows
 	${root_lib}/platform/CMSWindowsScreen.cpp
 	${root_lib}/platform/CMSWindowsScreenSaver.cpp
 	${root_lib}/platform/CMSWindowsUtil.cpp
+	${root_lib}/platform/CMSWindowsRelauncher.cpp
 )
 
 SET(inc_lib_platform_mswindows
@@ -219,6 +220,7 @@ SET(inc_lib_platform_mswindows
 	${root_lib}/platform/CMSWindowsScreen.h
 	${root_lib}/platform/CMSWindowsScreenSaver.h
 	${root_lib}/platform/CMSWindowsUtil.h
+	${root_lib}/platform/CMSWindowsRelauncher.h
 )
 
 SET(src_lib_platform_hook

lib/arch/CArch.h

@@ -54,8 +54,7 @@ class CArch : public IArchConsole,
 				public IArchString,
 				public IArchSystem,
 				public IArchTaskBar,
-				public IArchTime,
-				public IArchAppUtil {
+				public IArchTime {
 public:
 	CArch();
 	~CArch();
@@ -190,6 +189,10 @@ public:
 	virtual int run(int argc, char** argv, CreateTaskBarReceiverFunc createTaskBarReceiver);
 	virtual void beforeAppExit();
 
+	// expose util so we don't need to re-implement all the functions
+	IArchAppUtil& util() const { return *m_appUtil; }
+	IArchDaemon& daemon() const { return *m_daemon; }
+
 private:
 	static CArch*		s_instance;
 

lib/arch/CArchAppUtilWindows.cpp

@@ -22,6 +22,8 @@
 #include "CMSWindowsScreen.h"
 #include "XSynergy.h"
 #include "IArchTaskBarReceiver.h"
+#include "CMSWindowsRelauncher.h"
+#include "CScreen.h"
 
 #include <sstream>
 #include <iostream>
@@ -80,6 +82,9 @@ CArchAppUtilWindows::parseArg(const int& argc, const char* const* argv, int& i)
 
 		app().argsBase().m_debugServiceWait = true;
 	}
+	else if (app().isArg(i, argc, argv, NULL, "--relaunch")) {
+		app().argsBase().m_relaunchMode = true;
+	}
 	else {
 		// option not supported here
 		return false;
@@ -187,7 +192,7 @@ CArchAppUtilWindows::stopService()
 		}
 	}
 
-	LOG((CLOG_INFO "service '%s' stopping asyncronously", app().daemonName()));
+	LOG((CLOG_INFO "service '%s' stopping asynchronously", app().daemonName()));
 }
 
 static
@@ -200,10 +205,12 @@ mainLoopStatic()
 int 
 CArchAppUtilWindows::daemonNTMainLoop(int argc, const char** argv)
 {
-	app().initialize(argc, argv);
+	app().initApp(argc, argv);
 	debugServiceWait();
+
+	// NB: what the hell does this do?!
 	app().argsBase().m_backend = false;
-	app().loadConfig();
+	
 	return CArchMiscWindows::runDaemon(mainLoopStatic);
 }
 
@@ -305,3 +312,21 @@ CArchAppUtilWindows::debugServiceWait()
 		}
 	}
 }
+
+void 
+CArchAppUtilWindows::startNode()
+{
+	if (app().argsBase().m_relaunchMode) {
+
+		LOG((CLOG_DEBUG1 "entering relaunch mode"));
+		CMSWindowsRelauncher relauncher;
+		relauncher.startAsync();
+
+		// HACK: create a dummy screen, which can handle system events 
+		// (such as a stop request from the service controller).
+		CScreen* dummyScreen = app().createScreen();
+	}
+	else {
+		app().startNode();
+	}
+}

lib/arch/CArchAppUtilWindows.h

@@ -66,6 +66,8 @@ public:
 
 	static CArchAppUtilWindows& instance();
 
+	void startNode();
+
 private:
 	AppExitMode m_exitMode;
 	static BOOL WINAPI consoleHandler(DWORD CEvent);

lib/arch/CArchDaemonWindows.cpp

@@ -615,13 +615,14 @@ CArchDaemonWindows::serviceMain(DWORD argc, LPTSTR* argvIn)
 	m_serviceState = SERVICE_START_PENDING;
 	setStatus(m_serviceState, 0, 10000);
 
+	std::string commandLine;
+
 	// if no arguments supplied then try getting them from the registry.
 	// the first argument doesn't count because it's the service name.
 	Arguments args;
 	ArgList myArgv;
 	if (argc <= 1) {
 		// read command line
-		std::string commandLine;
 		HKEY key = openNTServicesKey();
 		key      = CArchMiscWindows::openKey(key, argvIn[0]);
 		key      = CArchMiscWindows::openKey(key, _T("Parameters"));
@@ -685,6 +686,8 @@ CArchDaemonWindows::serviceMain(DWORD argc, LPTSTR* argvIn)
 		}
 	}
 
+	m_commandLine = commandLine;
+
 	try {
 		// invoke daemon function
 		m_daemonResult = m_daemonFunc(static_cast<int>(argc), argv);

lib/arch/CArchDaemonWindows.h

@@ -83,6 +83,8 @@ public:
 	virtual bool		canInstallDaemon(const char* name, bool allUsers);
 	virtual bool		isDaemonInstalled(const char* name, bool allUsers);
 
+	std::string commandLine() const { return m_commandLine; }
+
 private:
 	static HKEY			openNTServicesKey();
 	static HKEY			open95ServicesKey();
@@ -129,6 +131,8 @@ private:
 	SERVICE_STATUS_HANDLE m_statusHandle;
 
 	UINT				m_quitMessage;
+
+	std::string			m_commandLine;
 };
 
 #endif

lib/arch/IArchAppUtil.h

@@ -27,4 +27,5 @@ public:
 	virtual CApp& app() const = 0;
 	virtual int run(int argc, char** argv, CreateTaskBarReceiverFunc createTaskBarReceiver) = 0;
 	virtual void beforeAppExit() = 0;
+	virtual void startNode() = 0;
 };

lib/platform/CMSWindowsRelauncher.cpp

@@ -0,0 +1,309 @@
+#include "CMSWindowsRelauncher.h"
+#include "CThread.h"
+#include "TMethodJob.h"
+#include "CLog.h"
+#include "CArch.h"
+#include "Version.h"
+#include "CArchDaemonWindows.h"
+
+#include <Tlhelp32.h>
+#include <UserEnv.h>
+#include <sstream>
+
+CMSWindowsRelauncher::CMSWindowsRelauncher()
+{
+	
+}
+
+CMSWindowsRelauncher::~CMSWindowsRelauncher()
+{
+	delete m_thread;
+}
+
+void 
+CMSWindowsRelauncher::startAsync()
+{
+	m_thread = new CThread(new TMethodJob<CMSWindowsRelauncher>(
+		this, &CMSWindowsRelauncher::startThread, nullptr));
+}
+
+void 
+CMSWindowsRelauncher::startThread(void*)
+{
+	LOG((CLOG_DEBUG "starting relaunch loop"));
+	int ret = relaunchLoop();
+
+	// HACK: this actually throws an exception to exit with 0 (nasty)
+	ARCH->util().app().m_bye(ret);
+}
+
+// this still gets the physical session (the one the keyboard and 
+// mouse is connected to), sometimes this returns -1 but not sure why
+DWORD 
+CMSWindowsRelauncher::getSessionId()
+{
+	return WTSGetActiveConsoleSessionId();
+}
+
+BOOL
+CMSWindowsRelauncher::winlogonInSession(DWORD sessionId, PHANDLE process)
+{
+	// first we need to take a snapshot of the running processes
+	HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
+	if (snapshot == INVALID_HANDLE_VALUE) {
+		LOG((CLOG_ERR "could not get process snapshot (error: %i)", 
+			GetLastError()));
+		return 0;
+	}
+
+	PROCESSENTRY32 entry;
+	entry.dwSize = sizeof(PROCESSENTRY32);
+
+	// get the first process, and if we can't do that then it's 
+	// unlikely we can go any further
+	BOOL gotEntry = Process32First(snapshot, &entry);
+	if (!gotEntry) {
+		LOG((CLOG_ERR "could not get first process entry (error: %i)", 
+			GetLastError()));
+		return 0;
+	}
+
+	// used to record process names for debug info
+	std::list<std::string> nameList;
+
+	// now just iterate until we can find winlogon.exe pid
+	DWORD pid = 0;
+	while(gotEntry) {
+
+		// make sure we're not checking the system process
+		if (entry.th32ProcessID != 0) {
+
+			DWORD processSessionId;
+			BOOL pidToSidRet = ProcessIdToSessionId(
+				entry.th32ProcessID, &processSessionId);
+
+			if (!pidToSidRet) {
+				LOG((CLOG_ERR "could not get session id for process id %i (error: %i)",
+					entry.th32ProcessID, GetLastError()));
+				return 0;
+			}
+
+			// only pay attention to processes in the active session
+			if (processSessionId == sessionId) {
+
+				// store the names so we can record them for debug
+				nameList.push_back(entry.szExeFile);
+
+				if (_stricmp(entry.szExeFile, "winlogon.exe") == 0) {
+					pid = entry.th32ProcessID;
+					break;
+				}
+			}
+		}
+
+		// now move on to the next entry (if we're not at the end)
+		gotEntry = Process32Next(snapshot, &entry);
+		if (!gotEntry) {
+
+			DWORD err = GetLastError();
+			if (err != ERROR_NO_MORE_FILES) {
+
+				// only worry about error if it's not the end of the snapshot
+				LOG((CLOG_ERR "could not get subsiquent process entry (error: %i)", 
+					GetLastError()));
+				return 0;
+			}
+		}
+	}
+
+	std::string nameListJoin;
+	for(std::list<std::string>::iterator it = nameList.begin();
+		it != nameList.end(); it++) {
+			nameListJoin.append(*it);
+			nameListJoin.append(", ");
+	}
+
+	LOG((CLOG_DEBUG "checked processes while looking for winlogon.exe: %s",
+		nameListJoin.c_str()));
+
+	CloseHandle(snapshot);
+
+	if (pid) {
+		// now get the process so we can get the process, with which
+		// we'll use to get the process token.
+		*process = OpenProcess(MAXIMUM_ALLOWED, FALSE, pid);
+		return true;
+	}
+	else {
+		LOG((CLOG_DEBUG "could not find winlogon.exe in session %i", sessionId));
+		return false;
+	}
+}
+
+// gets the current user (so we can launch under their session)
+HANDLE 
+CMSWindowsRelauncher::getCurrentUserToken(DWORD sessionId, LPSECURITY_ATTRIBUTES security)
+{
+	HANDLE currentToken;
+	HANDLE winlogonProcess;
+
+	if (winlogonInSession(sessionId, &winlogonProcess)) {
+
+		LOG((CLOG_DEBUG "session %i has winlogon.exe", sessionId));
+
+		// get the token, so we can re-launch with this token
+		// -- do we really need all these access bits?
+		BOOL tokenRet = OpenProcessToken(
+			winlogonProcess,
+			TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY | 
+			TOKEN_DUPLICATE | TOKEN_ASSIGN_PRIMARY | 
+			TOKEN_ADJUST_SESSIONID | TOKEN_READ | TOKEN_WRITE,
+			&currentToken);
+	}
+	else {
+
+		LOG((CLOG_ERR "session %i does not have winlogon.exe "
+			"which is needed for re-launch", sessionId));
+		return 0;
+	}
+
+	HANDLE primaryToken;
+	BOOL duplicateRet = DuplicateTokenEx(
+		currentToken, MAXIMUM_ALLOWED, security,
+		SecurityImpersonation, TokenPrimary, &primaryToken);
+
+	if (!duplicateRet) {
+		LOG((CLOG_ERR "could not duplicate token %i (error: %i)",
+			currentToken, GetLastError()));
+		return 0;
+	}
+
+	return primaryToken;
+}
+
+int
+CMSWindowsRelauncher::relaunchLoop()
+{
+	// start with invalid id (gets re-assigned on first loop)
+	DWORD sessionId = -1;
+
+	// keep here so we can check if proc running -- huh?
+	PROCESS_INFORMATION pi;
+	ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
+
+	int returnCode = kExitSuccess;
+	bool launched = false;
+
+	// TODO: fix this hack BEFORE release; we need to exit gracefully instead 
+	// of being force killed!
+	bool loopRunning = true;
+	while (loopRunning) {
+
+		DWORD newSessionId = getSessionId();
+
+		// only enter here when id changes, and the session isn't -1, which
+		// may mean that there is no active session.
+		if ((newSessionId != sessionId) && (newSessionId != -1)) {
+
+			// HACK: doesn't close process in a nice way
+			// TODO: use CloseMainWindow instead
+			if (launched) {
+				TerminateProcess(pi.hProcess, kExitSuccess);
+				LOG((CLOG_DEBUG "terminated existing process to make way for new one"));
+				launched = false;
+			}
+
+			// ok, this is now the active session (forget the old one if any)
+			sessionId = newSessionId;
+
+			SECURITY_ATTRIBUTES sa;
+			ZeroMemory(&sa, sizeof(SECURITY_ATTRIBUTES));
+
+			// get the token for the user in active session, which is the
+			// one receiving input from mouse and keyboard.
+			HANDLE userToken = getCurrentUserToken(sessionId, &sa);
+
+			if (userToken != 0) {
+				LOG((CLOG_DEBUG "got user token to launch new process"));
+
+				std::string cmd = getCommand();
+
+				// in case reusing process info struct
+				ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
+
+				STARTUPINFO si;
+				ZeroMemory(&si, sizeof(STARTUPINFO));
+				si.cb = sizeof(STARTUPINFO);
+				si.lpDesktop = "winsta0\\default";
+
+				LPVOID environment;
+				BOOL blockRet = CreateEnvironmentBlock(&environment, userToken, FALSE);
+				if (!blockRet) {
+					LOG((CLOG_ERR "could not create environment block (error: %i)", 
+						GetLastError()));
+
+					returnCode = kExitFailed;
+					loopRunning = false; // stop loop
+				}
+				else {
+
+					DWORD creationFlags = 
+						NORMAL_PRIORITY_CLASS |
+						CREATE_NO_WINDOW |
+						CREATE_UNICODE_ENVIRONMENT;
+
+					// re-launch in current active user session
+					BOOL createRet = CreateProcessAsUser(
+						userToken, NULL, LPSTR(cmd.c_str()),
+						&sa, NULL, TRUE, creationFlags,
+						environment, NULL, &si, &pi);
+
+					DestroyEnvironmentBlock(environment);
+					CloseHandle(userToken);
+
+					if (!createRet) {
+						LOG((CLOG_ERR "could not launch (error: %i)", GetLastError()));
+						returnCode = kExitFailed;
+						loopRunning = false;
+					}
+					else {
+						LOG((CLOG_DEBUG "launched in session %i (cmd: %s)", 
+							sessionId, cmd.c_str()));
+						launched = true;
+					}
+				}
+			}
+		}
+
+		// check for session change every second
+		ARCH->sleep(1);
+	}
+
+	if (launched) {
+		// HACK: kill just in case process it has survived somehow
+		TerminateProcess(pi.hProcess, kExitSuccess);
+	}
+
+	return kExitSuccess;
+}
+
+std::string CMSWindowsRelauncher::getCommand()
+{
+	// seems like a fairly convoluted way to get the process name
+	const char* launchName = ARCH->util().app().argsBase().m_pname;
+	std::string args = ((CArchDaemonWindows&)ARCH->daemon()).commandLine();
+
+	// build up a full command line
+	std::stringstream cmdTemp;
+	cmdTemp << launchName << /*" --debug-data session-" << sessionId <<*/ args;
+
+	std::string cmd = cmdTemp.str();
+
+	size_t i;
+	std::string find = "--relaunch";
+	while((i = cmd.find(find)) != std::string::npos) {
+		cmd.replace(i, find.length(), "");
+	}
+
+	return cmd;
+}

lib/platform/CMSWindowsRelauncher.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+#include <string>
+
+class CThread;
+
+class CMSWindowsRelauncher {
+public:
+	CMSWindowsRelauncher();
+	virtual ~CMSWindowsRelauncher();
+	void startAsync();
+	CThread* m_thread;
+	void startThread(void*);
+	BOOL winlogonInSession(DWORD sessionId, PHANDLE process);
+	DWORD getSessionId();
+	HANDLE getCurrentUserToken(DWORD sessionId, LPSECURITY_ATTRIBUTES security);
+	int relaunchLoop();
+	std::string getCommand();
+};

lib/synergy/CApp.cpp

@@ -49,6 +49,7 @@ CApp::CArgsBase::CArgsBase() :
 #if SYSAPI_WIN32
 m_daemon(false), // daemon mode not supported on windows (use --service)
 m_debugServiceWait(false),
+m_relaunchMode(false),
 #else
 m_daemon(true), // backward compatibility for unix (daemon by default)
 #endif
@@ -311,7 +312,7 @@ CApp::loggingFilterWarning()
 }
 
 void 
-CApp::initialize(int argc, const char** argv)
+CApp::initApp(int argc, const char** argv)
 {
 	// parse command line
 	parseArgs(argc, argv);

lib/synergy/CApp.h

@@ -21,6 +21,7 @@ class IArchTaskBarReceiver;
 class CBufferedLogOutputter;
 class ILogOutputter;
 class CFileLogOutputter;
+class CScreen;
 
 typedef IArchTaskBarReceiver* (*CreateTaskBarReceiverFunc)(const CBufferedLogOutputter*);
 typedef int (*StartupFunc)(int, char**);
@@ -41,6 +42,7 @@ public:
 		const char*	m_display;
 		CString m_name;
 #if SYSAPI_WIN32
+		bool m_relaunchMode;
 		bool m_debugServiceWait;
 #endif
 	};
@@ -98,10 +100,15 @@ public:
 	void loggingFilterWarning();
 
 	// Parses args, sets up file logging, and loads the config.
-	void initialize(int argc, const char** argv);
+	void initApp(int argc, const char** argv);
 
 	// HACK: accept non-const, but make it const anyway
-	void initialize(int argc, char** argv) { initialize(argc, (const char**)argv); }
+	void initApp(int argc, char** argv) { initApp(argc, (const char**)argv); }
+
+	// Start the server or client.
+	virtual void startNode() = 0;
+
+	virtual CScreen* createScreen() = 0;
 
 protected:
 	virtual void parseArgs(int argc, const char* const* argv, int &i);
@@ -157,6 +164,8 @@ private:
 	" [--service <action>]"
 #  define HELP_SYS_INFO \
 	"      --service <action>   manage the windows service, valid options are:\n" \
-	"                             install/uninstall/start/stop\n"
+	"                             install/uninstall/start/stop\n" \
+	"      --relaunch           persistently relaunches process in current user \n" \
+	"                             session (useful for vista and upward).\n"
 
 #endif

lib/synergy/CClientApp.cpp

@@ -412,7 +412,7 @@ CClientApp::closeClient(CClient* client)
 int
 CClientApp::foregroundStartup(int argc, char** argv)
 {
-	initialize(argc, argv);
+	initApp(argc, argv);
 
 	// never daemonize
 	return mainLoop();
@@ -483,12 +483,8 @@ CClientApp::mainLoop()
 	// create the event queue
 	CEventQueue eventQueue;
 
-	// start the client.  if this return false then we've failed and
-	// we shouldn't retry.
-	LOG((CLOG_DEBUG1 "starting client"));
-	if (!startClient()) {
-		return kExitFailed;
-	}
+	// start client, etc
+	ARCH->util().startNode();
 
 	// run event loop.  if startClient() failed we're supposed to retry
 	// later.  the timer installed by startClient() will take care of
@@ -522,7 +518,7 @@ daemonMainLoopStatic(int argc, const char** argv)
 int
 CClientApp::standardStartup(int argc, char** argv)
 {
-	initialize(argc, argv);
+	initApp(argc, argv);
 
 	// daemonize if requested
 	if (args().m_daemon) {
@@ -572,3 +568,14 @@ CClientApp::runInner(int argc, char** argv, ILogOutputter* outputter, StartupFun
 
 	return result;
 }
+
+void 
+CClientApp::startNode()
+{
+	// start the client.  if this return false then we've failed and
+	// we shouldn't retry.
+	LOG((CLOG_DEBUG1 "starting client"));
+	if (!startClient()) {
+		m_bye(kExitFailed);
+	}
+}

lib/synergy/CClientApp.h

@@ -73,6 +73,7 @@ public:
 	bool startClient();
 	void stopClient();
 	int mainLoop();
+	void startNode();
 
 	static CClientApp& instance() { return (CClientApp&)CApp::instance(); }
 

lib/synergy/CServerApp.cpp

@@ -740,12 +740,8 @@ int CServerApp::mainLoop()
 		return kExitFailed;
 	}
 
-	// start the server.  if this return false then we've failed and
-	// we shouldn't retry.
-	LOG((CLOG_DEBUG1 "starting server"));
-	if (!startServer()) {
-		return kExitFailed;
-	}
+	// start server, etc
+	ARCH->util().startNode();
 
 	// handle hangup signal by reloading the server's configuration
 	ARCH->setSignalHandler(CArch::kHANGUP, &reloadSignalHandler, NULL);
@@ -839,7 +835,7 @@ int daemonMainLoopStatic(int argc, const char** argv) {
 int 
 CServerApp::standardStartup(int argc, char** argv)
 {
-	initialize(argc, argv);
+	initApp(argc, argv);
 
 	// daemonize if requested
 	if (args().m_daemon) {
@@ -853,7 +849,7 @@ CServerApp::standardStartup(int argc, char** argv)
 int 
 CServerApp::foregroundStartup(int argc, char** argv)
 {
-	initialize(argc, argv);
+	initApp(argc, argv);
 
 	// never daemonize
 	return mainLoop();
@@ -886,3 +882,13 @@ CServerApp::daemonInfo() const
 #endif
 }
 
+void
+CServerApp::startNode()
+{
+	// start the server.  if this return false then we've failed and
+	// we shouldn't retry.
+	LOG((CLOG_DEBUG1 "starting server"));
+	if (!startServer()) {
+		m_bye(kExitFailed);
+	}
+}

lib/synergy/CServerApp.h

@@ -102,6 +102,7 @@ public:
 	int runInner(int argc, char** argv, ILogOutputter* outputter, StartupFunc startup, CreateTaskBarReceiverFunc createTaskBarReceiver);
 	int standardStartup(int argc, char** argv);
 	int foregroundStartup(int argc, char** argv);
+	void startNode();
 
 	static CServerApp& instance() { return (CServerApp&)CApp::instance(); }