path: root/krfb/krfb/rfbcontroller.cc

/***************************************************************************
                              rfbcontroller.cpp
                             -------------------
    begin                : Sun Dec 9 2001
    copyright            : (C) 2001-2003 by Tim Jansen
    email                : tim@tjansen.de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

/*
 * Contains keyboard & pointer handling from libvncserver's x11vnc.c
 */

#include "rfbcontroller.h"
#include "kuser.h"

#include <netinet/tcp.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>
#include <fcntl.h>

#ifdef USE_SOLARIS
#include <strings.h>
#endif

#include <tdeapplication.h>
#include <knotifyclient.h>
#include <kdebug.h>
#include <tdemessagebox.h>
#include <tdelocale.h>
#include <kextsock.h>
#include <tqstring.h>
#include <tqcursor.h>
#include <tqwindowdefs.h>
#include <tqtimer.h>
#include <tqcheckbox.h>
#include <tqpushbutton.h>
#include <tqglobal.h>
#include <tqlabel.h>
#include <tqmutex.h>
#include <tqdeepcopy.h>
#include <tqclipboard.h>
#include <tqdesktopwidget.h>

#include <X11/Xutil.h>
#include <X11/extensions/XTest.h>

#ifndef ASSERT
#define ASSERT(x) Q_ASSERT(x)
#endif

#define IDLE_PAUSE (1000/50)
#define MAX_SELECTION_LENGTH (4096)

static XTestDisabler disabler;

static const char* cur=
"                   "
" x                 "
" xx                "
" xxx               "
" xxxx              "
" xxxxx             "
" xxxxxx            "
" xxxxxxx           "
" xxxxxxxx          "
" xxxxxxxxx         "
" xxxxxxxxxx        "
" xxxxx             "
" xx xxx            "
" x  xxx            "
"     xxx           "
"     xxx           "
"      xxx          "
"      xxx          "
"                   ";

static const char* mask=
"xx                 "
"xxx                "
"xxxx               "
"xxxxx              "
"xxxxxx             "
"xxxxxxx            "
"xxxxxxxx           "
"xxxxxxxxx          "
"xxxxxxxxxx         "
"xxxxxxxxxxx        "
"xxxxxxxxxxxx       "
"xxxxxxxxxx         "
"xxxxxxxx           "
"xxxxxxxx           "
"xx  xxxxx          "
"    xxxxx          "
"     xxxxx         "
"     xxxxx         "
"      xxx          ";

static rfbCursorPtr myCursor;

// only one controller exists, so we can do this workaround for functions:
static RFBController *self;

class AppLocker
{
public:
	AppLocker() {
		TDEApplication::kApplication()->lock();
	}

	~AppLocker() {
		TDEApplication::kApplication()->unlock();
	}
};

static enum rfbNewClientAction newClientHook(struct _rfbClientRec *cl)
{
	AppLocker a;
	return self->handleNewClient(cl);
}

static rfbBool passwordCheck(rfbClientPtr cl,
			  const char* encryptedPassword,
			  int len)
{
	AppLocker a;
	return self->handleCheckPassword(cl, encryptedPassword, len);
}

static void keyboardHook(rfbBool down, rfbKeySym keySym, rfbClientPtr)
{
	self->handleKeyEvent(down ? true : false, keySym);
}

static void pointerHook(int bm, int x, int y, rfbClientPtr)
{
	self->handlePointerEvent(bm, x, y);
}

static void clientGoneHook(rfbClientPtr)
{
	self->handleClientGone();
}

#ifdef USE_MODIFIED_BUILTIN_LIBVNCSERVER
static void negotiationFinishedHook(rfbClientPtr cl)
{
	self->handleNegotiationFinished(cl);
}

static void inetdDisconnectHook()
{
	self->handleClientGone();
}
#endif

static void clipboardHook(char* str,int len, rfbClientPtr)
{
	self->clipboardToServer(TQString::fromUtf8(str, len));
}

VNCEvent::~VNCEvent() {
}

Display *KeyboardEvent::dpy;
signed char KeyboardEvent::modifiers[0x100];
KeyCode KeyboardEvent::keycodes[0x100];
KeyCode KeyboardEvent::leftShiftCode;
KeyCode KeyboardEvent::rightShiftCode;
KeyCode KeyboardEvent::altGrCode;
const int KeyboardEvent::LEFTSHIFT = 1;
const int KeyboardEvent::RIGHTSHIFT = 2;
const int KeyboardEvent::ALTGR = 4;
char KeyboardEvent::ModifierState;

KeyboardEvent::KeyboardEvent(bool d, KeySym k) :
	down(d),
	keySym(k) {
}

void KeyboardEvent::initKeycodes() {
	KeySym key,*keymap;
	int i,j,minkey,maxkey,syms_per_keycode;

	dpy = tqt_xdisplay();

	memset(modifiers,-1,sizeof(modifiers));

	XDisplayKeycodes(dpy,&minkey,&maxkey);
	ASSERT(minkey >= 8);
	ASSERT(maxkey < 256);
	keymap = (KeySym*) XGetKeyboardMapping(dpy, minkey,
				     (maxkey - minkey + 1),
				     &syms_per_keycode);
	ASSERT(keymap);

	for (i = minkey; i <= maxkey; i++)
		for (j=0; j<syms_per_keycode; j++) {
			key = keymap[(i-minkey)*syms_per_keycode+j];
			if (key>=' ' && key<0x100 && i==XKeysymToKeycode(dpy,key)) {
				keycodes[key]=i;
				modifiers[key]=j;
			}
		}

	leftShiftCode = XKeysymToKeycode(dpy, XK_Shift_L);
	rightShiftCode = XKeysymToKeycode(dpy, XK_Shift_R);
	altGrCode = XKeysymToKeycode(dpy, XK_Mode_switch);

	XFree ((char *)keymap);
}

/* this function adjusts the modifiers according to mod (as from modifiers) and ModifierState */
void KeyboardEvent::tweakModifiers(signed char mod, bool down) {

	bool isShift = ModifierState & (LEFTSHIFT|RIGHTSHIFT);
	if(mod < 0)
		return;

	if(isShift && mod != 1) {
		if(ModifierState & LEFTSHIFT)
			XTestFakeKeyEvent(dpy, leftShiftCode,
					  down, CurrentTime);
		if(ModifierState & RIGHTSHIFT)
				XTestFakeKeyEvent(dpy, rightShiftCode,
						  down, CurrentTime);
	}

	if(!isShift && mod==1)
		XTestFakeKeyEvent(dpy, leftShiftCode,
				  down, CurrentTime);

	if((ModifierState&ALTGR) && mod != 2)
		XTestFakeKeyEvent(dpy, altGrCode,
				  !down, CurrentTime);
	if(!(ModifierState&ALTGR) && mod==2)
		XTestFakeKeyEvent(dpy, altGrCode,
				  down, CurrentTime);
}

void KeyboardEvent::exec() {
#define ADJUSTMOD(sym,state) \
  if(keySym==sym) { if(down) ModifierState|=state; else ModifierState&=~state; }

	ADJUSTMOD(XK_Shift_L,LEFTSHIFT);
	ADJUSTMOD(XK_Shift_R,RIGHTSHIFT);
	ADJUSTMOD(XK_Mode_switch,ALTGR);

	if(keySym>=' ' && keySym<0x100) {
		KeyCode k;
		if (down)
			tweakModifiers(modifiers[keySym],True);
		k = keycodes[keySym];
		if (k != NoSymbol)
			XTestFakeKeyEvent(dpy, k, down, CurrentTime);

		if (down)
			tweakModifiers(modifiers[keySym],False);
	} else {
		KeyCode k = XKeysymToKeycode(dpy, keySym );
		if (k != NoSymbol)
			XTestFakeKeyEvent(dpy, k, down, CurrentTime);
	}
}

bool PointerEvent::initialized = false;
Display *PointerEvent::dpy;
int PointerEvent::buttonMask = 0;

PointerEvent::PointerEvent(int b, int _x, int _y) :
	button_mask(b),
	x(_x),
	y(_y) {
	if (!initialized) {
		initialized = true;
		dpy = tqt_xdisplay();
		buttonMask = 0;
	}
}

void PointerEvent::exec() {
	TQDesktopWidget *desktopWidget = TQApplication::desktop();

	int screen = desktopWidget->screenNumber();
	if (screen < 0)
		screen = 0;
	XTestFakeMotionEvent(dpy, screen, x, y, CurrentTime);
	for(int i = 0; i < 5; i++)
		if ((buttonMask&(1<<i))!=(button_mask&(1<<i)))
			XTestFakeButtonEvent(dpy,
					     i+1,
					     (button_mask&(1<<i))?True:False,
					     CurrentTime);

	buttonMask = button_mask;
}


ClipboardEvent::ClipboardEvent(RFBController *c, const TQString &ctext) :
	controller(c),
	text(TQDeepCopy<TQString>(ctext)) {
}

void ClipboardEvent::exec() {
	if ((controller->lastClipboardDirection == RFBController::LAST_SYNC_TO_CLIENT) &&
	    (controller->lastClipboardText == text)) {
		return;
	}
	controller->lastClipboardDirection = RFBController::LAST_SYNC_TO_SERVER;
	controller->lastClipboardText = text;

	controller->clipboard->setText(text, TQClipboard::Clipboard);
	controller->clipboard->setText(text, TQClipboard::Selection);
}


KNotifyEvent::KNotifyEvent(const TQString &n, const TQString &d) :
	name(n),
	desc(d) {
}

KNotifyEvent::~KNotifyEvent() {
}

void KNotifyEvent::exec() {
	KNotifyClient::event(name, desc);
}

SessionEstablishedEvent::SessionEstablishedEvent(RFBController *c) :
        controller(c)
{ }

void SessionEstablishedEvent::exec() {
        controller->sendSessionEstablished();
}

RFBController::RFBController(Configuration *c) :
	allowDesktopControl(false),
	lastClipboardDirection(LAST_SYNC_TO_SERVER),
	configuration(c),
	dialog( 0, "ConnectionDialog" ),
	disableBackgroundPending(false),
	disableBackgroundState(false),
	closePending(false),
	forcedClose(false)
{
	self = this;
	connect(&dialog, TQT_SIGNAL(okClicked()), TQT_SLOT(dialogAccepted()));
	connect(&dialog, TQT_SIGNAL(cancelClicked()), TQT_SLOT(dialogRefused()));
	connect(&initIdleTimer, TQT_SIGNAL(timeout()), TQT_SLOT(checkAsyncEvents()));
	connect(&idleTimer, TQT_SIGNAL(timeout()), TQT_SLOT(idleSlot()));

	clipboard = TQApplication::clipboard();
	connect(clipboard, TQT_SIGNAL(selectionChanged()), this, TQT_SLOT(selectionChanged()));
	connect(clipboard, TQT_SIGNAL(dataChanged()), this, TQT_SLOT(clipboardChanged()));

	asyncQueue.setAutoDelete(true);

	KeyboardEvent::initKeycodes();

	char hostname[256];
	if (gethostname(hostname, 255))
		hostname[0] = 0;
	hostname[255] = 0;
	desktopName = i18n("%1@%2 (shared desktop)").arg(KUser().loginName()).arg(hostname);
}

RFBController::~RFBController()
{
	stopServer();
}



void RFBController::startServer(int inetdFd, bool xtestGrab)
{
	framebufferImage = XGetImage(tqt_xdisplay(),
				     TQApplication::desktop()->winId(),
				     0,
				     0,
				     TQApplication::desktop()->width(),
				     TQApplication::desktop()->height(),
				     AllPlanes,
				     ZPixmap);

	int w = framebufferImage->width;
	int h = framebufferImage->height;
	char *fb = framebufferImage->data;

	int bpp = framebufferImage->bits_per_pixel >> 3;
	if (bpp != 1 && bpp != 2 && bpp != 4) bpp = 4;

	rfbLogEnable(0);
	server = rfbGetScreen(0, 0, w, h, (bpp*8), 8, bpp);

	rfbSetServerVersionIdentity(server, "krfb %s", KDE::versionString());

	server->paddedWidthInBytes = framebufferImage->bytes_per_line;

	server->serverFormat.bitsPerPixel = framebufferImage->bits_per_pixel;
	server->serverFormat.depth = framebufferImage->depth;
	server->serverFormat.trueColour = (uint8_t) TRUE;
	server->serverFormat.bigEndian =  (uint8_t) ((framebufferImage->bitmap_bit_order == MSBFirst) ? TRUE : FALSE);

	if ( server->serverFormat.bitsPerPixel == 8 ) {
		server->serverFormat.redShift = 0;
		server->serverFormat.greenShift = 3;
		server->serverFormat.blueShift = 6;
		server->serverFormat.redMax   = 7;
		server->serverFormat.greenMax = 7;
		server->serverFormat.blueMax  = 3;
	} else {
		server->serverFormat.redShift = 0;
		if ( framebufferImage->red_mask )
			while ( ! ( framebufferImage->red_mask & (1 << server->serverFormat.redShift) ) )
				server->serverFormat.redShift++;
		server->serverFormat.greenShift = 0;
		if ( framebufferImage->green_mask )
			while ( ! ( framebufferImage->green_mask & (1 << server->serverFormat.greenShift) ) )
				server->serverFormat.greenShift++;
		server->serverFormat.blueShift = 0;
		if ( framebufferImage->blue_mask )
			while ( ! ( framebufferImage->blue_mask & (1 << server->serverFormat.blueShift) ) )
				server->serverFormat.blueShift++;
		server->serverFormat.redMax   = framebufferImage->red_mask   >> server->serverFormat.redShift;
		server->serverFormat.greenMax = framebufferImage->green_mask >> server->serverFormat.greenShift;
		server->serverFormat.blueMax  = framebufferImage->blue_mask  >> server->serverFormat.blueShift;
	}

	server->frameBuffer = fb;
	server->autoPort = TRUE;
	server->inetdSock = inetdFd;

	server->kbdAddEvent = keyboardHook;
	server->ptrAddEvent = pointerHook;
	server->newClientHook = newClientHook;
#ifdef USE_MODIFIED_BUILTIN_LIBVNCSERVER
	server->inetdDisconnectHook = inetdDisconnectHook;
#endif // USE_MODIFIED_BUILTIN_LIBVNCSERVER
	server->passwordCheck = passwordCheck;
	server->setXCutText = clipboardHook;

	server->desktopName = desktopName.latin1();

	if (!myCursor)
		myCursor = rfbMakeXCursor(19, 19, (char*) cur, (char*) mask);
	server->cursor = myCursor;

	passwordChanged();

	scanner = new XUpdateScanner(tqt_xdisplay(),
				     TQApplication::desktop()->winId(),
				     (unsigned char*)fb, w, h,
				     server->serverFormat.bitsPerPixel,
				     server->paddedWidthInBytes,
				     !configuration->disableXShm());

	rfbInitServer(server);
	state = RFB_WAITING;

	if (xtestGrab) {
		disabler.disable = false;
		XTestGrabControl(tqt_xdisplay(), true);
	}

	rfbRunEventLoop(server, -1, TRUE);
	initIdleTimer.start(IDLE_PAUSE);
}

void RFBController::stopServer(bool xtestUngrab)
{
	rfbScreenCleanup(server);
	state = RFB_STOPPED;
	delete scanner;

	XDestroyImage(framebufferImage);

	if (xtestUngrab) {
		disabler.disable = true;
		TQTimer::singleShot(0, &disabler, TQT_SLOT(exec()));
	}
}

void RFBController::connectionAccepted(bool aRC)
{
	if (state != RFB_CONNECTING)
		return;

	allowDesktopControl = aRC;
	emit desktopControlSettingChanged(aRC);
	initIdleTimer.stop();
	idleTimer.start(IDLE_PAUSE);

	server->clientHead->clientGoneHook = clientGoneHook;
	state = RFB_CONNECTED;
	if (!server->authPasswdData)
	        emit sessionEstablished(remoteIp);
}

void RFBController::acceptConnection(bool aRemoteControl)
{
	KNotifyClient::event("UserAcceptsConnection",
			     i18n("User accepts connection from %1")
			     .arg(remoteIp));

	if (state != RFB_CONNECTING)
		return;

	connectionAccepted(aRemoteControl);
	rfbStartOnHoldClient(server->clientHead);
	server->clientHead->onHold = false;
}

void RFBController::refuseConnection()
{
	KNotifyClient::event("UserRefusesConnection",
			     i18n("User refuses connection from %1")
			     .arg(remoteIp));

	if (state != RFB_CONNECTING)
		return;
	rfbRefuseOnHoldClient(server->clientHead);
	state = RFB_WAITING;
}

// checks async events, returns true if client disconnected
bool RFBController::checkAsyncEvents()
{
	bool closed = false;
	bool backgroundActionRequired = false;
	asyncMutex.lock();
	VNCEvent *e;
	for (e = asyncQueue.first(); e; e = asyncQueue.next())
		e->exec();
	asyncQueue.clear();
	if (closePending) {
		connectionClosed();
		closed = true;
		closePending = false;
	}
	if (disableBackgroundPending != disableBackgroundState)
		backgroundActionRequired = true;
	asyncMutex.unlock();

	if (backgroundActionRequired && (!closed) && !configuration->disableBackground())
		disableBackground(disableBackgroundPending);

	return closed;
}

void RFBController::disableBackground(bool state) {
	if (disableBackgroundState == state)
		return;

	disableBackgroundState = state;
	DCOPRef ref("kdesktop", "KBackgroundIface");
	ref.setDCOPClient(TDEApplication::dcopClient());

	ref.send("setBackgroundEnabled(bool)", bool(!state));
}

void RFBController::connectionClosed()
{
	KNotifyClient::event("ConnectionClosed",
			     i18n("Closed connection: %1.")
			     .arg(remoteIp));

	idleTimer.stop();
	initIdleTimer.stop();
	disableBackground(false);
	state = RFB_WAITING;
	if (forcedClose)
	        emit quitApp();
	else
	        emit sessionFinished();
}

void RFBController::closeConnection()
{
        forcedClose = true;
	if (state == RFB_CONNECTED) {
	        disableBackground(false);

		if (!checkAsyncEvents()) {
			asyncMutex.lock();
			if (!closePending)
				rfbCloseClient(server->clientHead);
			asyncMutex.unlock();
		}
	}
	else if (state == RFB_CONNECTING)
		refuseConnection();
}

void RFBController::enableDesktopControl(bool b) {
	if (b != allowDesktopControl)
		emit desktopControlSettingChanged(b);
	allowDesktopControl = b;
}

void RFBController::idleSlot()
{
	if (state != RFB_CONNECTED)
		return;
	if (checkAsyncEvents() || forcedClose)
		return;

	TQPtrList<Hint> v;
	v.setAutoDelete(true);
	TQPoint p = TQCursor::pos();
	scanner->searchUpdates(v, p.y());

	Hint *h;

	for (h = v.first(); h != 0; h = v.next())
		rfbMarkRectAsModified(server, h->left(),
				      h->top(),
				      h->right(),
				      h->bottom());

	asyncMutex.lock();
	if (!closePending)
		rfbDefaultPtrAddEvent(0, p.x(),p.y(), server->clientHead);
	asyncMutex.unlock();

	checkAsyncEvents(); // check 2nd time (see 3rd line)
}

void RFBController::dialogAccepted()
{
	dialog.hide();
	acceptConnection(dialog.allowRemoteControl());
}

void RFBController::dialogRefused()
{
	refuseConnection();
	dialog.hide();
	emit sessionRefused();
}

bool checkPassword(const TQString &p,
	unsigned char *ochallenge,
	const char *response,
	int len) {

	if ((len == 0) && (p.length() == 0))
		return true;

	char passwd[MAXPWLEN];
	unsigned char challenge[CHALLENGESIZE];

	memcpy(challenge, ochallenge, CHALLENGESIZE);
	bzero(passwd, MAXPWLEN);
	if (!p.isNull())
		strncpy(passwd, p.latin1(),
			(MAXPWLEN <= p.length()) ? MAXPWLEN : p.length());

	rfbEncryptBytes(challenge, passwd);
	return memcmp(challenge, response, len) == 0;
}

bool RFBController::handleCheckPassword(rfbClientPtr cl,
					const char *response,
					int len)
{

	bool authd = false;

	if (configuration->allowUninvitedConnections())
		authd = checkPassword(configuration->password(),
			cl->authChallenge, response, len);

	if (!authd) {
		TQValueList<Invitation>::iterator it =
			configuration->invitations().begin();
		while (it != configuration->invitations().end()) {
			if (checkPassword((*it).password(),
				cl->authChallenge, response, len) &&
				(*it).isValid()) {
				authd = true;
				configuration->removeInvitation(it);
				break;
			}
			it++;
		}
	}

	if (!authd) {
		if (configuration->invitations().size() > 0) {
			sendKNotifyEvent("InvalidPasswordInvitations",
					i18n("Failed login attempt from %1: wrong password")
					.arg(remoteIp));
}
		else
			sendKNotifyEvent("InvalidPassword",
					i18n("Failed login attempt from %1: wrong password")
					.arg(remoteIp));
		return FALSE;
	}

	asyncMutex.lock();
	asyncQueue.append(new SessionEstablishedEvent(this));
	asyncMutex.unlock();

	return TRUE;
}

enum rfbNewClientAction RFBController::handleNewClient(rfbClientPtr cl)
{
	int socket = cl->sock;
#ifdef USE_MODIFIED_BUILTIN_LIBVNCSERVER
	cl->negotiationFinishedHook = negotiationFinishedHook;
#endif // USE_MODIFIED_BUILTIN_LIBVNCSERVER

	TQString host, port;
	TDESocketAddress *ksa = KExtendedSocket::peerAddress(socket);
	if (ksa) {
		hostent *he = 0;
		KInetSocketAddress *kisa = (KInetSocketAddress*) ksa;
		in_addr ia4 = kisa->hostV4();
		he = gethostbyaddr((const char*)&ia4,
				   sizeof(ia4),
				   AF_INET);

		if (he && he->h_name)
			host = TQString(he->h_name);
		else
			host = ksa->nodeName();
		delete ksa;
	}

	if (state != RFB_WAITING) {
		sendKNotifyEvent("TooManyConnections",
					i18n("Connection refused from %1, already connected.")
					.arg(host));
		return RFB_CLIENT_REFUSE;
	}
	remoteIp = host;
	state = RFB_CONNECTING;

	if ((!configuration->askOnConnect()) &&
	    (configuration->invitations().size() == 0)) {
		sendKNotifyEvent("NewConnectionAutoAccepted",
					i18n("Accepted uninvited connection from %1")
					.arg(remoteIp));

		connectionAccepted(configuration->allowDesktopControl());
		return RFB_CLIENT_ACCEPT;
	}

	sendKNotifyEvent("NewConnectionOnHold",
				i18n("Received connection from %1, on hold (waiting for confirmation)")
				.arg(remoteIp));

	dialog.setRemoteHost(remoteIp);
	dialog.setAllowRemoteControl( true );
	dialog.setFixedSize(dialog.sizeHint());
	dialog.show();
	return RFB_CLIENT_ON_HOLD;
}

void RFBController::handleClientGone()
{
	asyncMutex.lock();
	closePending = true;
	asyncMutex.unlock();
}

#ifdef USE_MODIFIED_BUILTIN_LIBVNCSERVER
void RFBController::handleNegotiationFinished(rfbClientPtr cl)
{
	asyncMutex.lock();
	disableBackgroundPending = cl->disableBackground;
	asyncMutex.unlock();
}
#endif // USE_MODIFIED_BUILTIN_LIBVNCSERVER

void RFBController::handleKeyEvent(bool down, KeySym keySym) {
	if (!allowDesktopControl)
		return;

	asyncMutex.lock();
	asyncQueue.append(new KeyboardEvent(down, keySym));
	asyncMutex.unlock();
}

void RFBController::handlePointerEvent(int button_mask, int x, int y) {
	if (!allowDesktopControl)
		return;

	asyncMutex.lock();
	asyncQueue.append(new PointerEvent(button_mask, x, y));
	asyncMutex.unlock();
}


void RFBController::clipboardToServer(const TQString &ctext) {
	if (!allowDesktopControl)
		return;

	asyncMutex.lock();
	asyncQueue.append(new ClipboardEvent(this, ctext));
	asyncMutex.unlock();
}

void RFBController::clipboardChanged() {
	if (state != RFB_CONNECTED)
		return;
	if (clipboard->ownsClipboard())
		return;

	TQString text = clipboard->text(TQClipboard::Clipboard);

	// avoid ping-pong between client&server
	if ((lastClipboardDirection == LAST_SYNC_TO_SERVER) &&
	    (lastClipboardText == text))
		return;
	if ((text.length() > MAX_SELECTION_LENGTH) || text.isNull())
		return;

	lastClipboardDirection = LAST_SYNC_TO_CLIENT;
	lastClipboardText = text;
	TQCString ctext = text.utf8();
	rfbSendServerCutText(server, ctext.data(), ctext.length());
}

void RFBController::selectionChanged() {
	if (state != RFB_CONNECTED)
		return;
	if (clipboard->ownsSelection())
		return;

	TQString text = clipboard->text(TQClipboard::Selection);
	// avoid ping-pong between client&server
	if ((lastClipboardDirection == LAST_SYNC_TO_SERVER) &&
	    (lastClipboardText == text))
		return;
	if ((text.length() > MAX_SELECTION_LENGTH) || text.isNull())
		return;

	lastClipboardDirection = LAST_SYNC_TO_CLIENT;
	lastClipboardText = text;
	TQCString ctext = text.utf8();
	rfbSendServerCutText(server, ctext.data(), ctext.length());
}

void RFBController::passwordChanged() {
	bool authRequired = (!configuration->allowUninvitedConnections()) ||
		(configuration->password().length() != 0) ||
		(configuration->invitations().count() > 0);

	server->authPasswdData = (void*) (authRequired ? 1 : 0);
}

void RFBController::sendKNotifyEvent(const TQString &n, const TQString &d)
{
	asyncMutex.lock();
	asyncQueue.append(new KNotifyEvent(n, d));
	asyncMutex.unlock();
}

void RFBController::sendSessionEstablished()
{
	if (configuration->disableBackground())
		disableBackground(true);
        emit sessionEstablished(remoteIp);
}

#ifdef __osf__
extern "C" Bool XShmQueryExtension(Display*);
#endif

bool RFBController::checkX11Capabilities() {
	int bp1, bp2, majorv, minorv;
	Bool r = XTestQueryExtension(tqt_xdisplay(), &bp1, &bp2,
				     &majorv, &minorv);
	if ((!r) || (((majorv*1000)+minorv) < 2002)) {
		KMessageBox::error(0,
		   i18n("Your X11 Server does not support the required XTest extension version 2.2. Sharing your desktop is not possible."),
				   i18n("Desktop Sharing Error"));
		return false;
	}

	return true;
}


XTestDisabler::XTestDisabler() :
	disable(false) {
}

void XTestDisabler::exec() {
	if (disable)
		XTestDiscard(tqt_xdisplay());
}

#include "rfbcontroller.moc"