ctrl+alt+del emulation checkpoint.

lib/platform/CMSWindowsPrimaryScreen.cpp

@@ -521,15 +521,29 @@ CMSWindowsPrimaryScreen::onPreDispatch(const CEvent* event)
 	case SYNERGY_MSG_KEY:
 		// ignore message if posted prior to last mark change
 		if (!ignore()) {
+			WPARAM wParam = msg->wParam;
+			LPARAM lParam = msg->lParam;
+
+			// check for ctrl+alt+del emulation
+			if ((wParam == VK_PAUSE || wParam == VK_CANCEL) &&
+				(m_keys[VK_CONTROL] & 0x80) != 0 &&
+				(m_keys[VK_MENU]    & 0x80) != 0) {
+				LOG((CLOG_DEBUG "emulate ctrl+alt+del"));
+				wParam  = VK_DELETE;
+				lParam &= 0xffff0000;
+				lParam |= 0x00000001;
+			}
+
+			// process key normally
 			KeyModifierMask mask;
-			const KeyID key = mapKey(msg->wParam, msg->lParam, &mask);
+			const KeyID key = mapKey(wParam, lParam, &mask);
 			KeyButton button = static_cast<KeyButton>(
-								(msg->lParam & 0x00ff0000u) >> 16);
+								(lParam & 0x00ff0000u) >> 16);
 			if (key != kKeyNone && key != kKeyMultiKey) {
-				if ((msg->lParam & 0x80000000) == 0) {
+				if ((lParam & 0x80000000) == 0) {
 					// key press
-					const bool wasDown  = ((msg->lParam & 0x40000000) != 0);
-					const SInt32 repeat = (SInt32)(msg->lParam & 0xffff);
+					const bool wasDown  = ((lParam & 0x40000000) != 0);
+					const SInt32 repeat = (SInt32)(lParam & 0xffff);
 					if (repeat >= 2 || wasDown) {
 						LOG((CLOG_DEBUG1 "event: key repeat key=%d mask=0x%04x count=%d button=0x%04x", key, mask, repeat, button));
 						m_receiver->onKeyRepeat(key, mask, repeat, button);

lib/platform/CMSWindowsSecondaryScreen.cpp

@@ -16,6 +16,8 @@
 #include "CMSWindowsScreen.h"
 #include "XScreen.h"
 #include "CLock.h"
+#include "CThread.h"
+#include "CFunctionJob.h"
 #include "CLog.h"
 #include "CArchMiscWindows.h"
 #include <cctype>
@@ -94,6 +96,14 @@ CMSWindowsSecondaryScreen::keyDown(KeyID key,
 	CLock lock(&m_mutex);
 	m_screen->syncDesktop();
 
+	// check for ctrl+alt+del emulation
+	if (key == kKeyDelete &&
+		(mask & (KeyModifierControl | KeyModifierAlt)) ==
+				(KeyModifierControl | KeyModifierAlt)) {
+		synthesizeCtrlAltDel();
+		return;
+	}
+
 	// get the sequence of keys to simulate key press and the final
 	// modifier state.
 	m_mask = mapKey(keys, virtualKey, key, mask, kPress);
@@ -1517,3 +1527,52 @@ CMSWindowsSecondaryScreen::getCodePageFromLangID(LANGID langid) const
 
 	return codePage;
 }
+
+void
+CMSWindowsSecondaryScreen::synthesizeCtrlAltDel()
+{
+	LOG((CLOG_DEBUG "emulating ctrl+alt+del"));
+	if (!m_is95Family) {
+		// to fake ctrl+alt+del on the NT family we broadcast a suitable
+		// hotkey to all windows on the winlogon desktop.  however, we
+		// the current thread must be on that desktop to do the broadcast
+		// and we can't switch just any thread because some own windows
+		// or hooks.  so start a new thread to do the real work.
+		CThread cad(new CFunctionJob(
+							&CMSWindowsSecondaryScreen::ctrlAltDelThread));
+		cad.wait();
+	}
+	else {
+		Keystrokes keys;
+		UINT virtualKey;
+		KeyID key            = kKeyDelete;
+		KeyModifierMask mask = KeyModifierControl | KeyModifierAlt;
+
+		// get the sequence of keys to simulate ctrl+alt+del
+		mapKey(keys, virtualKey, key, mask, kPress);
+		if (!keys.empty()) {
+			// generate key events
+			doKeystrokes(keys, 1);
+		}
+	}
+}
+
+void
+CMSWindowsSecondaryScreen::ctrlAltDelThread(void*)
+{
+	// get the Winlogon desktop at whatever privilege we can
+	HDESK desk = OpenDesktop("Winlogon", 0, FALSE, MAXIMUM_ALLOWED);
+	if (desk != NULL) {
+		if (SetThreadDesktop(desk)) {
+			PostMessage(HWND_BROADCAST, WM_HOTKEY, 0,
+						MAKELPARAM(MOD_CONTROL | MOD_ALT, VK_DELETE));
+		}
+		else {
+			LOG((CLOG_DEBUG "can't switch to Winlogon desk: %d", GetLastError()));
+		}
+		CloseDesktop(desk);
+	}
+	else {
+		LOG((CLOG_DEBUG "can't open Winlogon desk: %d", GetLastError()));
+	}
+}

lib/platform/CMSWindowsSecondaryScreen.h

@@ -122,6 +122,12 @@ private:
 
 	UINT				getCodePageFromLangID(LANGID) const;
 
+	// generate a fake ctrl+alt+del
+	void				synthesizeCtrlAltDel();
+
+	// thread that generates fake ctrl+alt+del
+	static void			ctrlAltDelThread(void*);
+
 private:
 	CMutex				m_mutex;
 	CMSWindowsScreen*	m_screen;

lib/platform/CXWindowsPrimaryScreen.cpp

@@ -239,8 +239,18 @@ CXWindowsPrimaryScreen::onEvent(CEvent* event)
 		{
 			LOG((CLOG_DEBUG1 "event: KeyPress code=%d, state=0x%04x", xevent.xkey.keycode, xevent.xkey.state));
 			const KeyModifierMask mask = mapModifier(xevent.xkey.state);
-			const KeyID key = mapKey(&xevent.xkey);
+			KeyID key                  = mapKey(&xevent.xkey);
 			if (key != kKeyNone) {
+				// check for ctrl+alt+del emulation
+				if ((key == kKeyPause || key == kKeyCancel) &&
+					(mask & (KeyModifierControl | KeyModifierAlt)) ==
+							(KeyModifierControl | KeyModifierAlt)) {
+					// pretend it's ctrl+alt+del
+					LOG((CLOG_DEBUG "emulate ctrl+alt+del"));
+					key = kKeyDelete;
+				}
+
+				// handle key
 				m_receiver->onKeyDown(key, mask,
 								static_cast<KeyButton>(xevent.xkey.keycode));
 				if (key == kKeyCapsLock && m_capsLockHalfDuplex) {
@@ -258,7 +268,7 @@ CXWindowsPrimaryScreen::onEvent(CEvent* event)
 	case KeyRelease:
 		{
 			const KeyModifierMask mask = mapModifier(xevent.xkey.state);
-			const KeyID key = mapKey(&xevent.xkey);
+			KeyID key                  = mapKey(&xevent.xkey);
 			if (key != kKeyNone) {
 				// check if this is a key repeat by getting the next
 				// KeyPress event that has the same key and time as
@@ -279,6 +289,18 @@ CXWindowsPrimaryScreen::onEvent(CEvent* event)
 									&CXWindowsPrimaryScreen::findKeyEvent,
 									(XPointer)&filter) == True);
 				}
+
+				// check for ctrl+alt+del emulation
+				if ((key == kKeyPause || key == kKeyCancel) &&
+					(mask & (KeyModifierControl | KeyModifierAlt)) ==
+							(KeyModifierControl | KeyModifierAlt)) {
+					// pretend it's ctrl+alt+del and ignore autorepeat
+					LOG((CLOG_DEBUG "emulate ctrl+alt+del"));
+					key      = kKeyDelete;
+					hasPress = false;
+				}
+
+
 				if (!hasPress) {
 					// no press event follows so it's a plain release
 					LOG((CLOG_DEBUG1 "event: KeyRelease code=%d, state=0x%04x", xevent.xkey.keycode, xevent.xkey.state));

lib/platform/CXWindowsSecondaryScreen.cpp

@@ -117,6 +117,17 @@ CXWindowsSecondaryScreen::keyDown(KeyID key,
 	Keystrokes keys;
 	KeyCode keycode;
 
+	// check for ctrl+alt+del emulation
+	if ((mask & (KeyModifierControl | KeyModifierAlt)) ==
+				(KeyModifierControl | KeyModifierAlt) &&
+		key == XK_Up - 0xff00 + 0xef00) {
+		// just convert the key to Delete and synthesize the key
+		// normally.  the X server/window manager will do the right
+		// thing (or, at least XFree86/KDE will).
+		LOG((CLOG_DEBUG "ctrl+alt+del emulation"));
+		key = XK_Delete - 0xff00u + 0xef00u;
+	}
+
 	// get the sequence of keys to simulate key press and the final
 	// modifier state.
 	m_mask = mapKey(keys, keycode, key, mask, kPress);