HANDLE
MSWindowsWatchdog::duplicateProcessToken(HANDLE process, LPSECURITY_ATTRIBUTES security)
{
HANDLE sourceToken;
BOOL tokenRet = OpenProcessToken(
process,
TOKEN_ASSIGN_PRIMARY | TOKEN_ALL_ACCESS,
&sourceToken);
if (!tokenRet) {
LOG((CLOG_ERR "could not open token, process handle: %d", process));
throw XArch(new XArchEvalWindows());
}
LOG((CLOG_DEBUG "got token %i, duplicating", sourceToken));
HANDLE newToken;
BOOL duplicateRet = DuplicateTokenEx(
sourceToken, TOKEN_ASSIGN_PRIMARY | TOKEN_ALL_ACCESS, security,
SecurityImpersonation, TokenPrimary, &newToken);
if (!duplicateRet) {
LOG((CLOG_ERR "could not duplicate token %i", sourceToken));
throw XArch(new XArchEvalWindows());
}
LOG((CLOG_DEBUG "duplicated, new token: %i", newToken));
return newToken;
}
String
WinINetRequest::send()
{
if (m_used) {
throw XArch("class is one time use.");
}
m_used = true;
openSession();
connect();
openRequest();
String headers("Content-Type: text/html");
if (!HttpSendRequest(m_request, headers.c_str(), (DWORD)headers.length(), NULL, NULL)) {
throw XArch(new XArchEvalWindows());
}
std::stringstream result;
CHAR buffer[1025];
DWORD read = 0;
while (InternetReadFile(m_request, buffer, sizeof(buffer) - 1, &read) && (read != 0)) {
buffer[read] = 0;
result << buffer;
read = 0;
}
return result.str();
}
void
MSWindowsWatchdog::shutdownExistingProcesses()
{
// 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"));
throw XArch(new XArchEvalWindows);
}
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"));
throw XArch(new XArchEvalWindows);
}
// 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) {
if (_stricmp(entry.szExeFile, "synergyc.exe") == 0 ||
_stricmp(entry.szExeFile, "synergys.exe") == 0) {
HANDLE handle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, entry.th32ProcessID);
shutdownProcess(handle, entry.th32ProcessID, 10);
}
}
// 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"));
throw XArch(new XArchEvalWindows);
}
}
}
CloseHandle(snapshot);
m_processRunning = false;
}
void
ArchPluginWindows::load()
{
String dir = getPluginsDir();
LOG((CLOG_DEBUG "plugins dir: %s", dir.c_str()));
String pattern = String(dir).append("\\*.dll");
std::vector<String> plugins;
getFilenames(pattern, plugins);
std::vector<String>::iterator it;
for (it = plugins.begin(); it != plugins.end(); ++it) {
LOG((CLOG_DEBUG "loading plugin: %s", (*it).c_str()));
String path = String(dir).append("\\").append(*it);
HINSTANCE library = LoadLibrary(path.c_str());
if (library == NULL) {
LOG((CLOG_ERR "failed to load plugin: %s %d", (*it).c_str(), GetLastError()));
throw XArch(new XArchEvalWindows);
}
void* lib = reinterpret_cast<void*>(library);
String filename = synergy::string::removeFileExt(*it);
m_pluginTable.insert(std::make_pair(filename, lib));
LOG((CLOG_DEBUG "loaded plugin: %s", (*it).c_str()));
}
}
CString
CArchPluginWindows::getModuleDir()
{
TCHAR c_modulePath[MAX_PATH];
if (GetModuleFileName(NULL, c_modulePath, MAX_PATH) == 0) {
throw XArch(new XArchEvalWindows);
}
CString modulePath(c_modulePath);
size_t lastSlash = modulePath.find_last_of("\\");
if (lastSlash != CString::npos) {
return modulePath.substr(0, lastSlash);
}
throw XArch("could not get module path.");
}
CAppUtilWindows::CAppUtilWindows() :
m_exitMode(kExitModeNormal)
{
if (SetConsoleCtrlHandler((PHANDLER_ROUTINE)consoleHandler, TRUE) == FALSE)
{
throw XArch(new XArchEvalWindows());
}
}
void
ArchSystemWindows::setting(const std::string& valueName, const std::string& valueString) const
{
HKEY key = ArchMiscWindows::addKey(HKEY_LOCAL_MACHINE, s_settingsKeyNames);
if (key == NULL)
throw XArch(std::string("could not access registry key: ") + valueName);
ArchMiscWindows::setValue(key, valueName.c_str(), valueString.c_str());
}
void
MSWindowsWatchdog::startProcess()
{
if (m_command.empty()) {
throw XMSWindowsWatchdogError("cannot start process, command is empty");
}
m_commandChanged = false;
if (m_processRunning) {
LOG((CLOG_DEBUG "closing existing process to make way for new one"));
shutdownProcess(m_processInfo.hProcess, m_processInfo.dwProcessId, 20);
m_processRunning = false;
}
m_session.updateActiveSession();
SECURITY_ATTRIBUTES sa;
ZeroMemory(&sa, sizeof(SECURITY_ATTRIBUTES));
getActiveDesktop(&sa);
ZeroMemory(&sa, sizeof(SECURITY_ATTRIBUTES));
HANDLE userToken = getUserToken(&sa);
m_autoElevated = false;
// patch by Jack Zhou and Henry Tung
// set UIAccess to fix Windows 8 GUI interaction
// http://synergy-project.org/spit/issues/details/3338/#c70
DWORD uiAccess = 1;
SetTokenInformation(userToken, TokenUIAccess, &uiAccess, sizeof(DWORD));
BOOL createRet = doStartProcess(m_command, userToken, &sa);
if (!createRet) {
LOG((CLOG_ERR "could not launch"));
DWORD exitCode = 0;
GetExitCodeProcess(m_processInfo.hProcess, &exitCode);
LOG((CLOG_ERR "exit code: %d", exitCode));
throw XArch(new XArchEvalWindows);
}
else {
// wait for program to fail.
ARCH->sleep(1);
if (!isProcessActive()) {
throw XMSWindowsWatchdogError("process immediately stopped");
}
m_processRunning = true;
m_processFailures = 0;
LOG((CLOG_DEBUG "started process, session=%i, command=%s",
m_session.getActiveSessionId(), m_command.c_str()));
}
}
HANDLE
MSWindowsSession::getUserToken(LPSECURITY_ATTRIBUTES security)
{
HANDLE sourceToken;
if (!WTSQueryUserToken(m_activeSessionId, &sourceToken)) {
LOG((CLOG_ERR "could not get token from session %d", m_activeSessionId));
throw XArch(new XArchEvalWindows);
}
HANDLE newToken;
if (!DuplicateTokenEx(
sourceToken, TOKEN_ASSIGN_PRIMARY | TOKEN_ALL_ACCESS, security,
SecurityImpersonation, TokenPrimary, &newToken)) {
LOG((CLOG_ERR "could not duplicate token"));
throw XArch(new XArchEvalWindows);
}
LOG((CLOG_DEBUG "duplicated, new token: %i", newToken));
return newToken;
}
void
CArchPluginWindows::load(const CString& dllFilename)
{
LOG((CLOG_DEBUG "loading plugin: %s", dllFilename.c_str()));
CString path = CString(getPluginsDir()).append("\\").append(dllFilename);
HINSTANCE library = LoadLibrary(path.c_str());
if (library == NULL)
throw XArch(new XArchEvalWindows);
initFunc initPlugin = (initFunc)GetProcAddress(library, "init");
initPlugin(&sendEvent, &log);
}
void
WinINetRequest::connect()
{
m_connect = InternetConnect(
m_session,
m_url.m_host.c_str(),
m_url.m_port,
NULL,
NULL,
INTERNET_SERVICE_HTTP,
NULL,
NULL);
if (m_connect == NULL) {
throw XArch(new XArchEvalWindows());
}
}
void
WinINetRequest::openRequest()
{
m_request = HttpOpenRequest(
m_connect,
"GET",
m_url.m_path.c_str(),
HTTP_VERSION,
NULL,
NULL,
m_url.m_flags,
NULL);
if (m_request == NULL) {
throw XArch(new XArchEvalWindows());
}
}
BOOL
MSWindowsSession::nextProcessEntry(HANDLE snapshot, LPPROCESSENTRY32 entry)
{
BOOL 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 next process entry"));
throw XArch(new XArchEvalWindows());
}
}
return gotEntry;
}
void
WinINetRequest::openSession()
{
std::stringstream userAgent;
userAgent << "Synergy ";
userAgent << kVersion;
m_session = InternetOpen(
userAgent.str().c_str(),
INTERNET_OPEN_TYPE_PRECONFIG,
NULL,
NULL,
NULL);
if (m_session == NULL) {
throw XArch(new XArchEvalWindows());
}
}
String
ArchInternetWindows::urlEncode(const String& url)
{
TCHAR buffer[1024];
DWORD bufferSize = sizeof(buffer);
if (UrlEscape(url.c_str(), buffer, &bufferSize, URL_ESCAPE_UNSAFE) != S_OK) {
throw XArch(new XArchEvalWindows());
}
String result(buffer);
// the win32 url encoding funcitons are pretty useless (to us) and only
// escape "unsafe" chars, but not + or =, so we need to replace these
// manually (and probably many other chars).
synergy::string::findReplaceAll(result, "+", "%2B");
synergy::string::findReplaceAll(result, "=", "%3D");
return result;
}
BOOL
MSWindowsWatchdog::doStartProcess(String& command, HANDLE userToken, LPSECURITY_ATTRIBUTES sa)
{
// clear, as we're reusing process info struct
ZeroMemory(&m_processInfo, sizeof(PROCESS_INFORMATION));
STARTUPINFO si;
ZeroMemory(&si, sizeof(STARTUPINFO));
si.cb = sizeof(STARTUPINFO);
si.lpDesktop = "winsta0\\Default"; // TODO: maybe this should be \winlogon if we have logonui.exe?
si.hStdError = m_stdOutWrite;
si.hStdOutput = m_stdOutWrite;
si.dwFlags |= STARTF_USESTDHANDLES;
LPVOID environment;
BOOL blockRet = CreateEnvironmentBlock(&environment, userToken, FALSE);
if (!blockRet) {
LOG((CLOG_ERR "could not create environment block"));
throw XArch(new XArchEvalWindows);
}
DWORD creationFlags =
NORMAL_PRIORITY_CLASS |
CREATE_NO_WINDOW |
CREATE_UNICODE_ENVIRONMENT;
// re-launch in current active user session
LOG((CLOG_INFO "starting new process"));
BOOL createRet = CreateProcessAsUser(
userToken, NULL, LPSTR(command.c_str()),
sa, NULL, TRUE, creationFlags,
environment, NULL, &si, &m_processInfo);
DestroyEnvironmentBlock(environment);
CloseHandle(userToken);
return createRet;
}
COSXScreen::COSXScreen(IEventQueue* events, bool isPrimary, bool autoShowHideCursor) :
CPlatformScreen(events),
m_events(events),
MouseButtonEventMap(NumButtonIDs),
m_isPrimary(isPrimary),
m_isOnScreen(m_isPrimary),
m_cursorPosValid(false),
m_cursorHidden(false),
m_dragNumButtonsDown(0),
m_dragTimer(NULL),
m_keyState(NULL),
m_sequenceNumber(0),
m_screensaver(NULL),
m_screensaverNotify(false),
m_ownClipboard(false),
m_clipboardTimer(NULL),
m_hiddenWindow(NULL),
m_userInputWindow(NULL),
m_switchEventHandlerRef(0),
m_pmMutex(new CMutex),
m_pmWatchThread(NULL),
m_pmThreadReady(new CCondVar<bool>(m_pmMutex, false)),
m_activeModifierHotKey(0),
m_activeModifierHotKeyMask(0),
m_lastSingleClick(0),
m_lastDoubleClick(0),
m_lastSingleClickXCursor(0),
m_lastSingleClickYCursor(0),
m_autoShowHideCursor(autoShowHideCursor),
m_eventTapRLSR(nullptr),
m_eventTapPort(nullptr),
m_pmRootPort(0)
{
try {
m_displayID = CGMainDisplayID();
updateScreenShape(m_displayID, 0);
m_screensaver = new COSXScreenSaver(m_events, getEventTarget());
m_keyState = new COSXKeyState(m_events);
// TODO: http://stackoverflow.com/questions/2950124/enable-access-for-assistive-device-programmatically
if (m_isPrimary && !AXAPIEnabled())
throw XArch("system setting not enabled: \"Enable access for assistive devices\"");
// install display manager notification handler
#if defined(MAC_OS_X_VERSION_10_5)
CGDisplayRegisterReconfigurationCallback(displayReconfigurationCallback, this);
#else
m_displayManagerNotificationUPP =
NewDMExtendedNotificationUPP(displayManagerCallback);
OSStatus err = GetCurrentProcess(&m_PSN);
err = DMRegisterExtendedNotifyProc(m_displayManagerNotificationUPP,
this, 0, &m_PSN);
#endif
// install fast user switching event handler
EventTypeSpec switchEventTypes[2];
switchEventTypes[0].eventClass = kEventClassSystem;
switchEventTypes[0].eventKind = kEventSystemUserSessionDeactivated;
switchEventTypes[1].eventClass = kEventClassSystem;
switchEventTypes[1].eventKind = kEventSystemUserSessionActivated;
EventHandlerUPP switchEventHandler =
NewEventHandlerUPP(userSwitchCallback);
InstallApplicationEventHandler(switchEventHandler, 2, switchEventTypes,
this, &m_switchEventHandlerRef);
DisposeEventHandlerUPP(switchEventHandler);
constructMouseButtonEventMap();
// watch for requests to sleep
m_events->adoptHandler(m_events->forCOSXScreen().confirmSleep(),
getEventTarget(),
new TMethodEventJob<COSXScreen>(this,
&COSXScreen::handleConfirmSleep));
// create thread for monitoring system power state.
*m_pmThreadReady = false;
LOG((CLOG_DEBUG "starting watchSystemPowerThread"));
m_pmWatchThread = new CThread(new TMethodJob<COSXScreen>
(this, &COSXScreen::watchSystemPowerThread));
}
catch (...) {
m_events->removeHandler(m_events->forCOSXScreen().confirmSleep(),
getEventTarget());
if (m_switchEventHandlerRef != 0) {
RemoveEventHandler(m_switchEventHandlerRef);
}
#if defined(MAC_OS_X_VERSION_10_5)
CGDisplayRemoveReconfigurationCallback(displayReconfigurationCallback, this);
#else
if (m_displayManagerNotificationUPP != NULL) {
DMRemoveExtendedNotifyProc(m_displayManagerNotificationUPP,
NULL, &m_PSN, 0);
}
if (m_hiddenWindow) {
ReleaseWindow(m_hiddenWindow);
m_hiddenWindow = NULL;
}
if (m_userInputWindow) {
ReleaseWindow(m_userInputWindow);
m_userInputWindow = NULL;
}
#endif
delete m_keyState;
delete m_screensaver;
throw;
}
// install event handlers
m_events->adoptHandler(CEvent::kSystem, m_events->getSystemTarget(),
new TMethodEventJob<COSXScreen>(this,
&COSXScreen::handleSystemEvent));
// install the platform event queue
m_events->adoptBuffer(new COSXEventQueueBuffer(m_events));
}
void
CMSWindowsRelauncher::mainLoop(void*)
{
SendSas sendSasFunc = NULL;
HINSTANCE sasLib = LoadLibrary("sas.dll");
if (sasLib) {
LOG((CLOG_DEBUG "found sas.dll"));
sendSasFunc = (SendSas)GetProcAddress(sasLib, "SendSAS");
}
DWORD sessionId = -1;
bool launched = false;
SECURITY_ATTRIBUTES saAttr;
saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
saAttr.bInheritHandle = TRUE;
saAttr.lpSecurityDescriptor = NULL;
if (!CreatePipe(&m_stdOutRead, &m_stdOutWrite, &saAttr, 0)) {
throw XArch(new XArchEvalWindows());
}
PROCESS_INFORMATION pi;
ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
while (m_running) {
HANDLE sendSasEvent = 0;
if (sasLib && sendSasFunc) {
// can't we just create one event? seems weird creating a new
// event every second...
sendSasEvent = CreateEvent(NULL, FALSE, FALSE, "Global\\SendSAS");
}
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)) || m_commandChanged) {
m_commandChanged = false;
if (launched) {
LOG((CLOG_DEBUG "closing existing process to make way for new one"));
shutdownProcess(pi, 10);
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 = command();
if (cmd == "") {
LOG((CLOG_WARN "nothing to launch, no command specified."));
continue;
}
// 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";
si.hStdError = m_stdOutWrite;
si.hStdOutput = m_stdOutWrite;
si.dwFlags |= STARTF_USESTDHANDLES;
LPVOID environment;
BOOL blockRet = CreateEnvironmentBlock(&environment, userToken, FALSE);
if (!blockRet) {
LOG((CLOG_ERR "could not create environment block (error: %i)",
GetLastError()));
continue;
}
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()));
continue;
}
else {
LOG((CLOG_DEBUG "launched in session %i (cmd: %s)",
sessionId, cmd.c_str()));
launched = true;
}
}
}
}
if (sendSasEvent) {
// use SendSAS event to wait for next session.
if (WaitForSingleObject(sendSasEvent, 1000) == WAIT_OBJECT_0 && sendSasFunc) {
LOG((CLOG_DEBUG "calling SendSAS"));
sendSasFunc(FALSE);
}
CloseHandle(sendSasEvent);
}
else {
// check for session change every second.
ARCH->sleep(1);
}
}
if (launched) {
LOG((CLOG_DEBUG "terminated running process on exit"));
shutdownProcess(pi, 10);
}
}
void
MSWindowsWatchdog::mainLoop(void*)
{
shutdownExistingProcesses();
SendSas sendSasFunc = NULL;
HINSTANCE sasLib = LoadLibrary("sas.dll");
if (sasLib) {
LOG((CLOG_DEBUG "found sas.dll"));
sendSasFunc = (SendSas)GetProcAddress(sasLib, "SendSAS");
}
SECURITY_ATTRIBUTES saAttr;
saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
saAttr.bInheritHandle = TRUE;
saAttr.lpSecurityDescriptor = NULL;
if (!CreatePipe(&m_stdOutRead, &m_stdOutWrite, &saAttr, 0)) {
throw XArch(new XArchEvalWindows());
}
ZeroMemory(&m_processInfo, sizeof(PROCESS_INFORMATION));
while (m_monitoring) {
try {
if (m_processRunning && getCommand().empty()) {
LOG((CLOG_INFO "process started but command is empty, shutting down"));
shutdownExistingProcesses();
m_processRunning = false;
continue;
}
if (m_processFailures != 0) {
// increasing backoff period, maximum of 10 seconds.
int timeout = (m_processFailures * 2) < 10 ? (m_processFailures * 2) : 10;
LOG((CLOG_INFO "backing off, wait=%ds, failures=%d", timeout, m_processFailures));
ARCH->sleep(timeout);
}
if (!getCommand().empty() && ((m_processFailures != 0) || m_session.hasChanged() || m_commandChanged)) {
startProcess();
}
if (m_processRunning && !isProcessActive()) {
m_processFailures++;
m_processRunning = false;
LOG((CLOG_WARN "detected application not running, pid=%d",
m_processInfo.dwProcessId));
}
if (sendSasFunc != NULL) {
HANDLE sendSasEvent = CreateEvent(NULL, FALSE, FALSE, "Global\\SendSAS");
if (sendSasEvent != NULL) {
// use SendSAS event to wait for next session (timeout 1 second).
if (WaitForSingleObject(sendSasEvent, 1000) == WAIT_OBJECT_0) {
LOG((CLOG_DEBUG "calling SendSAS"));
sendSasFunc(FALSE);
}
CloseHandle(sendSasEvent);
continue;
}
}
// if the sas event failed, wait by sleeping.
ARCH->sleep(1);
}
catch (std::exception& e) {
LOG((CLOG_ERR "failed to launch, error: %s", e.what()));
m_processFailures++;
m_processRunning = false;
continue;
}
catch (...) {
LOG((CLOG_ERR "failed to launch, unknown error."));
m_processFailures++;
m_processRunning = false;
continue;
}
}
if (m_processRunning) {
LOG((CLOG_DEBUG "terminated running process on exit"));
shutdownProcess(m_processInfo.hProcess, m_processInfo.dwProcessId, 20);
}
LOG((CLOG_DEBUG "watchdog main thread finished"));
}
void
CMSWindowsRelauncher::mainLoop(void*)
{
shutdownExistingProcesses();
SendSas sendSasFunc = NULL;
HINSTANCE sasLib = LoadLibrary("sas.dll");
if (sasLib) {
LOG((CLOG_DEBUG "found sas.dll"));
sendSasFunc = (SendSas)GetProcAddress(sasLib, "SendSAS");
}
DWORD sessionId = -1;
bool launched = false;
SECURITY_ATTRIBUTES saAttr;
saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
saAttr.bInheritHandle = TRUE;
saAttr.lpSecurityDescriptor = NULL;
if (!CreatePipe(&m_stdOutRead, &m_stdOutWrite, &saAttr, 0)) {
throw XArch(new XArchEvalWindows());
}
PROCESS_INFORMATION pi;
ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
int failures = 0;
while (m_running) {
HANDLE sendSasEvent = 0;
if (sasLib && sendSasFunc) {
// can't we just create one event? seems weird creating a new
// event every second...
sendSasEvent = CreateEvent(NULL, FALSE, FALSE, "Global\\SendSAS");
}
DWORD newSessionId = getSessionId();
bool running = false;
if (launched) {
DWORD exitCode;
GetExitCodeProcess(pi.hProcess, &exitCode);
running = (exitCode == STILL_ACTIVE);
if (!running) {
failures++;
LOG((CLOG_INFO "detected application not running, pid=%d, failures=%d", pi.dwProcessId, failures));
// increasing backoff period, maximum of 10 seconds.
int timeout = (failures * 2) < 10 ? (failures * 2) : 10;
LOG((CLOG_DEBUG "waiting, backoff period is %d seconds", timeout));
ARCH->sleep(timeout);
// double check, in case process started after we waited.
GetExitCodeProcess(pi.hProcess, &exitCode);
running = (exitCode == STILL_ACTIVE);
}
else {
// reset failures when running.
failures = 0;
}
}
// only enter here when id changes, and the session isn't -1, which
// may mean that there is no active session.
bool sessionChanged = ((newSessionId != sessionId) && (newSessionId != -1));
// relaunch if it was running but has stopped unexpectedly.
bool stoppedRunning = (launched && !running);
if (stoppedRunning || sessionChanged || m_commandChanged) {
m_commandChanged = false;
if (launched) {
LOG((CLOG_DEBUG "closing existing process to make way for new one"));
shutdownProcess(pi.hProcess, pi.dwProcessId, 20);
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 = command();
if (cmd == "") {
// this appears on first launch when the user hasn't configured
// anything yet, so don't show it as a warning, only show it as
// debug to devs to let them know why nothing happened.
LOG((CLOG_DEBUG "nothing to launch, no command specified."));
continue;
}
// 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";
si.hStdError = m_stdOutWrite;
si.hStdOutput = m_stdOutWrite;
si.dwFlags |= STARTF_USESTDHANDLES;
LPVOID environment;
BOOL blockRet = CreateEnvironmentBlock(&environment, userToken, FALSE);
if (!blockRet) {
LOG((CLOG_ERR "could not create environment block (error: %i)",
GetLastError()));
continue;
}
else {
DWORD creationFlags =
NORMAL_PRIORITY_CLASS |
CREATE_NO_WINDOW |
CREATE_UNICODE_ENVIRONMENT;
// re-launch in current active user session
LOG((CLOG_INFO "starting new process"));
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()));
continue;
}
else {
LOG((CLOG_DEBUG "launched in session %i (cmd: %s)",
sessionId, cmd.c_str()));
launched = true;
}
}
}
}
if (sendSasEvent) {
// use SendSAS event to wait for next session.
if (WaitForSingleObject(sendSasEvent, 1000) == WAIT_OBJECT_0 && sendSasFunc) {
LOG((CLOG_DEBUG "calling SendSAS"));
sendSasFunc(FALSE);
}
CloseHandle(sendSasEvent);
}
else {
// check for session change every second.
ARCH->sleep(1);
}
}
if (launched) {
LOG((CLOG_DEBUG "terminated running process on exit"));
shutdownProcess(pi.hProcess, pi.dwProcessId, 20);
}
LOG((CLOG_DEBUG "relauncher main thread finished"));
}
bool
MSWindowsSession::isProcessInSession(const char* name, PHANDLE process = NULL)
{
// 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"));
throw XArch(new XArchEvalWindows());
}
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"));
throw XArch(new XArchEvalWindows());
}
// 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) {
// if we can not acquire session associated with a specified process,
// simply ignore it
LOG((CLOG_ERR "could not get session id for process id %i", entry.th32ProcessID));
gotEntry = nextProcessEntry(snapshot, &entry);
continue;
}
else {
// only pay attention to processes in the active session
if (processSessionId == m_activeSessionId) {
// store the names so we can record them for debug
nameList.push_back(entry.szExeFile);
if (_stricmp(entry.szExeFile, name) == 0) {
pid = entry.th32ProcessID;
}
}
}
}
// now move on to the next entry (if we're not at the end)
gotEntry = nextProcessEntry(snapshot, &entry);
}
std::string nameListJoin;
for(std::list<std::string>::iterator it = nameList.begin();
it != nameList.end(); it++) {
nameListJoin.append(*it);
nameListJoin.append(", ");
}
LOG((CLOG_DEBUG "processes in session %d: %s",
m_activeSessionId, nameListJoin.c_str()));
CloseHandle(snapshot);
if (pid) {
if (process != NULL) {
// now get the process, which we'll use to get the process token.
LOG((CLOG_DEBUG "found %s in session %i", name, m_activeSessionId));
*process = OpenProcess(MAXIMUM_ALLOWED, FALSE, pid);
}
return true;
}
else {
LOG((CLOG_DEBUG "did not find %s in session %i", name, m_activeSessionId));
return false;
}
}
