/apps/desktop/libvncserver/rfbserver.c

/*
 * rfbserver.c - deal with server-side of the RFB protocol.
 */

/*
 *  Copyright (C) 2005 Rohit Kumar, Johannes E. Schindelin
 *  Copyright (C) 2002 RealVNC Ltd.
 *  OSXvnc Copyright (C) 2001 Dan McGuirk <mcguirk@incompleteness.net>.
 *  Original Xvnc code Copyright (C) 1999 AT&T Laboratories Cambridge.  
 *  All Rights Reserved.
 *
 *  This 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.
 *
 *  This software is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this software; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
 *  USA.
 */

#ifdef __STRICT_ANSI__
#define _BSD_SOURCE
#endif
#include <string.h>
#include <rfb/rfb.h>
#include <rfb/rfbregion.h>
#include "private.h"

#ifdef LIBVNCSERVER_HAVE_FCNTL_H
#include <fcntl.h>
#endif

#ifdef WIN32
#define write(sock,buf,len) send(sock,buf,len,0)
#else
#ifdef LIBVNCSERVER_HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <pwd.h>
#ifdef LIBVNCSERVER_HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef LIBVNCSERVER_HAVE_NETINET_IN_H
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#endif
#endif

#ifdef CORBA
#include <vncserverctrl.h>
#endif

#ifdef DEBUGPROTO
#undef DEBUGPROTO
#define DEBUGPROTO(x) x
#else
#define DEBUGPROTO(x)
#endif
#include <stdarg.h>
#include <scale.h>
/* stst() */
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
/* readdir() */
#include <dirent.h>
/* errno */
#include <errno.h>

#ifdef __MINGW32__
static int compat_mkdir(const char *path, int mode)
{
	return mkdir(path);
}
#define mkdir compat_mkdir
#endif

static void rfbProcessClientProtocolVersion(rfbClientPtr cl);
static void rfbProcessClientNormalMessage(rfbClientPtr cl);
static void rfbProcessClientInitMessage(rfbClientPtr cl);

#ifdef LIBVNCSERVER_HAVE_LIBPTHREAD
void rfbIncrClientRef(rfbClientPtr cl)
{
  LOCK(cl->refCountMutex);
  cl->refCount++;
  UNLOCK(cl->refCountMutex);
}

void rfbDecrClientRef(rfbClientPtr cl)
{
  LOCK(cl->refCountMutex);
  cl->refCount--;
  if(cl->refCount<=0) /* just to be sure also < 0 */
    TSIGNAL(cl->deleteCond);
  UNLOCK(cl->refCountMutex);
}
#else
void rfbIncrClientRef(rfbClientPtr cl) {}
void rfbDecrClientRef(rfbClientPtr cl) {}
#endif

#ifdef LIBVNCSERVER_HAVE_LIBPTHREAD
static MUTEX(rfbClientListMutex);
#endif

struct rfbClientIterator {
  rfbClientPtr next;
  rfbScreenInfoPtr screen;
  rfbBool closedToo;
};

void
rfbClientListInit(rfbScreenInfoPtr rfbScreen)
{
    if(sizeof(rfbBool)!=1) {
        /* a sanity check */
        fprintf(stderr,"rfbBool's size is not 1 (%d)!\n",(int)sizeof(rfbBool));
	/* we cannot continue, because rfbBool is supposed to be char everywhere */
	exit(1);
    }
    rfbScreen->clientHead = NULL;
    INIT_MUTEX(rfbClientListMutex);
}

rfbClientIteratorPtr
rfbGetClientIterator(rfbScreenInfoPtr rfbScreen)
{
  rfbClientIteratorPtr i =
    (rfbClientIteratorPtr)malloc(sizeof(struct rfbClientIterator));
  i->next = NULL;
  i->screen = rfbScreen;
  i->closedToo = FALSE;
  return i;
}

rfbClientIteratorPtr
rfbGetClientIteratorWithClosed(rfbScreenInfoPtr rfbScreen)
{
  rfbClientIteratorPtr i =
    (rfbClientIteratorPtr)malloc(sizeof(struct rfbClientIterator));
  i->next = NULL;
  i->screen = rfbScreen;
  i->closedToo = TRUE;
  return i;
}

rfbClientPtr
rfbClientIteratorHead(rfbClientIteratorPtr i)
{
#ifdef LIBVNCSERVER_HAVE_LIBPTHREAD
  if(i->next != 0) {
    rfbDecrClientRef(i->next);
    rfbIncrClientRef(i->screen->clientHead);
  }
#endif
  LOCK(rfbClientListMutex);
  i->next = i->screen->clientHead;
  UNLOCK(rfbClientListMutex);
  return i->next;
}

rfbClientPtr
rfbClientIteratorNext(rfbClientIteratorPtr i)
{
  if(i->next == 0) {
    LOCK(rfbClientListMutex);
    i->next = i->screen->clientHead;
    UNLOCK(rfbClientListMutex);
  } else {
    IF_PTHREADS(rfbClientPtr cl = i->next);
    i->next = i->next->next;
    IF_PTHREADS(rfbDecrClientRef(cl));
  }

#ifdef LIBVNCSERVER_HAVE_LIBPTHREAD
    if(!i->closedToo)
      while(i->next && i->next->sock<0)
        i->next = i->next->next;
    if(i->next)
      rfbIncrClientRef(i->next);
#endif

    return i->next;
}

void
rfbReleaseClientIterator(rfbClientIteratorPtr iterator)
{
  IF_PTHREADS(if(iterator->next) rfbDecrClientRef(iterator->next));
  free(iterator);
}


/*
 * rfbNewClientConnection is called from sockets.c when a new connection
 * comes in.
 */

void
rfbNewClientConnection(rfbScreenInfoPtr rfbScreen,
                       int sock)
{
    rfbClientPtr cl;

    cl = rfbNewClient(rfbScreen,sock);
#ifdef CORBA
    if(cl!=NULL)
      newConnection(cl, (KEYBOARD_DEVICE|POINTER_DEVICE),1,1,1);
#endif
}


/*
 * rfbReverseConnection is called by the CORBA stuff to make an outward
 * connection to a "listening" RFB client.
 */

rfbClientPtr
rfbReverseConnection(rfbScreenInfoPtr rfbScreen,
                     char *host,
                     int port)
{
    int sock;
    rfbClientPtr cl;

    if ((sock = rfbConnect(rfbScreen, host, port)) < 0)
        return (rfbClientPtr)NULL;

    cl = rfbNewClient(rfbScreen, sock);

    if (cl) {
        cl->reverseConnection = TRUE;
    }

    return cl;
}


void
rfbSetProtocolVersion(rfbScreenInfoPtr rfbScreen, int major_, int minor_)
{
    /* Permit the server to set the version to report */
    /* TODO: sanity checking */
    if ((major_==3) && (minor_ > 2 && minor_ < 9))
    {
      rfbScreen->protocolMajorVersion = major_;
      rfbScreen->protocolMinorVersion = minor_;
    }
    else
        rfbLog("rfbSetProtocolVersion(%d,%d) set to invalid values\n", major_, minor_);
}

/*
 * rfbNewClient is called when a new connection has been made by whatever
 * means.
 */

static rfbClientPtr
rfbNewTCPOrUDPClient(rfbScreenInfoPtr rfbScreen,
                     int sock,
                     rfbBool isUDP)
{
    rfbProtocolVersionMsg pv;
    rfbClientIteratorPtr iterator;
    rfbClientPtr cl,cl_;
    struct sockaddr_in addr;
    socklen_t addrlen = sizeof(struct sockaddr_in);
    rfbProtocolExtension* extension;

    cl = (rfbClientPtr)calloc(sizeof(rfbClientRec),1);

    cl->screen = rfbScreen;
    cl->sock = sock;
    cl->viewOnly = FALSE;
    /* setup pseudo scaling */
    cl->scaledScreen = rfbScreen;
    cl->scaledScreen->scaledScreenRefCount++;

    rfbResetStats(cl);

    cl->clientData = NULL;
    cl->clientGoneHook = rfbDoNothingWithClient;

    if(isUDP) {
      rfbLog(" accepted UDP client\n");
    } else {
      int one=1;

      getpeername(sock, (struct sockaddr *)&addr, &addrlen);
      cl->host = strdup(inet_ntoa(addr.sin_addr));

      rfbLog("  other clients:\n");
      iterator = rfbGetClientIterator(rfbScreen);
      while ((cl_ = rfbClientIteratorNext(iterator)) != NULL) {
        rfbLog("     %s\n",cl_->host);
      }
      rfbReleaseClientIterator(iterator);

#ifndef WIN32
      if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) {
	rfbLogPerror("fcntl failed");
	close(sock);
	return NULL;
      }
#endif

      if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
		     (char *)&one, sizeof(one)) < 0) {
	rfbLogPerror("setsockopt failed");
	close(sock);
	return NULL;
      }

      FD_SET(sock,&(rfbScreen->allFds));
		rfbScreen->maxFd = max(sock,rfbScreen->maxFd);

      INIT_MUTEX(cl->outputMutex);
      INIT_MUTEX(cl->refCountMutex);
      INIT_COND(cl->deleteCond);

      cl->state = RFB_PROTOCOL_VERSION;

      cl->reverseConnection = FALSE;
      cl->readyForSetColourMapEntries = FALSE;
      cl->useCopyRect = FALSE;
      cl->preferredEncoding = -1;
      cl->correMaxWidth = 48;
      cl->correMaxHeight = 48;
#ifdef LIBVNCSERVER_HAVE_LIBZ
      cl->zrleData = NULL;
#endif

      cl->copyRegion = sraRgnCreate();
      cl->copyDX = 0;
      cl->copyDY = 0;
   
      cl->modifiedRegion =
	sraRgnCreateRect(0,0,rfbScreen->width,rfbScreen->height);

      INIT_MUTEX(cl->updateMutex);
      INIT_COND(cl->updateCond);

      cl->requestedRegion = sraRgnCreate();

      cl->format = cl->screen->serverFormat;
      cl->translateFn = rfbTranslateNone;
      cl->translateLookupTable = NULL;

      LOCK(rfbClientListMutex);

      IF_PTHREADS(cl->refCount = 0);
      cl->next = rfbScreen->clientHead;
      cl->prev = NULL;
      if (rfbScreen->clientHead)
        rfbScreen->clientHead->prev = cl;

      rfbScreen->clientHead = cl;
      UNLOCK(rfbClientListMutex);

#ifdef LIBVNCSERVER_HAVE_LIBZ
#ifdef LIBVNCSERVER_HAVE_LIBJPEG
      cl->tightCompressLevel = TIGHT_DEFAULT_COMPRESSION;
      cl->tightQualityLevel = -1;
      {
	int i;
	for (i = 0; i < 4; i++)
          cl->zsActive[i] = FALSE;
      }
#endif
#endif

      cl->fileTransfer.fd = -1;

      cl->enableCursorShapeUpdates = FALSE;
      cl->enableCursorPosUpdates = FALSE;
      cl->useRichCursorEncoding = FALSE;
      cl->enableLastRectEncoding = FALSE;
      cl->enableKeyboardLedState = FALSE;
      cl->enableSupportedMessages = FALSE;
      cl->enableSupportedEncodings = FALSE;
      cl->enableServerIdentity = FALSE;
      cl->lastKeyboardLedState = -1;
      cl->cursorX = rfbScreen->cursorX;
      cl->cursorY = rfbScreen->cursorY;
      cl->useNewFBSize = FALSE;

#ifdef LIBVNCSERVER_HAVE_LIBZ
      cl->compStreamInited = FALSE;
      cl->compStream.total_in = 0;
      cl->compStream.total_out = 0;
      cl->compStream.zalloc = Z_NULL;
      cl->compStream.zfree = Z_NULL;
      cl->compStream.opaque = Z_NULL;

      cl->zlibCompressLevel = 5;
#endif

      cl->progressiveSliceY = 0;

      cl->extensions = NULL;

      cl->lastPtrX = -1;

      sprintf(pv,rfbProtocolVersionFormat,rfbScreen->protocolMajorVersion, 
              rfbScreen->protocolMinorVersion);

      if (rfbWriteExact(cl, pv, sz_rfbProtocolVersionMsg) < 0) {
        rfbLogPerror("rfbNewClient: write");
        rfbCloseClient(cl);
	rfbClientConnectionGone(cl);
        return NULL;
      }
    }

    for(extension = rfbGetExtensionIterator(); extension;
	    extension=extension->next) {
	void* data = NULL;
	/* if the extension does not have a newClient method, it wants
	 * to be initialized later. */
	if(extension->newClient && extension->newClient(cl, &data))
		rfbEnableExtension(cl, extension, data);
    }
    rfbReleaseExtensionIterator();

    switch (cl->screen->newClientHook(cl)) {
    case RFB_CLIENT_ON_HOLD:
	    cl->onHold = TRUE;
	    break;
    case RFB_CLIENT_ACCEPT:
	    cl->onHold = FALSE;
	    break;
    case RFB_CLIENT_REFUSE:
	    rfbCloseClient(cl);
	    rfbClientConnectionGone(cl);
	    cl = NULL;
	    break;
    }
    return cl;
}

rfbClientPtr
rfbNewClient(rfbScreenInfoPtr rfbScreen,
             int sock)
{
  return(rfbNewTCPOrUDPClient(rfbScreen,sock,FALSE));
}

rfbClientPtr
rfbNewUDPClient(rfbScreenInfoPtr rfbScreen)
{
  return((rfbScreen->udpClient=
	  rfbNewTCPOrUDPClient(rfbScreen,rfbScreen->udpSock,TRUE)));
}

/*
 * rfbClientConnectionGone is called from sockets.c just after a connection
 * has gone away.
 */

void
rfbClientConnectionGone(rfbClientPtr cl)
{
#ifdef LIBVNCSERVER_HAVE_LIBJPEG
    int i;
#endif

    LOCK(rfbClientListMutex);

    if (cl->prev)
        cl->prev->next = cl->next;
    else
        cl->screen->clientHead = cl->next;
    if (cl->next)
        cl->next->prev = cl->prev;

    if(cl->sock>0)
	close(cl->sock);

    if (cl->scaledScreen!=NULL)
        cl->scaledScreen->scaledScreenRefCount--;

#ifdef LIBVNCSERVER_HAVE_LIBZ
    rfbFreeZrleData(cl);
#endif

    rfbFreeUltraData(cl);

#ifdef LIBVNCSERVER_HAVE_LIBPTHREAD
    if(cl->screen->backgroundLoop != FALSE) {
      int i;
      do {
	LOCK(cl->refCountMutex);
	i=cl->refCount;
	if(i>0)
	  WAIT(cl->deleteCond,cl->refCountMutex);
	UNLOCK(cl->refCountMutex);
      } while(i>0);
    }
#endif

    UNLOCK(rfbClientListMutex);

    if(cl->sock>=0)
       FD_CLR(cl->sock,&(cl->screen->allFds));

    cl->clientGoneHook(cl);

    rfbLog("Client %s gone\n",cl->host);
    free(cl->host);

#ifdef LIBVNCSERVER_HAVE_LIBZ
    /* Release the compression state structures if any. */
    if ( cl->compStreamInited ) {
	deflateEnd( &(cl->compStream) );
    }

#ifdef LIBVNCSERVER_HAVE_LIBJPEG
    for (i = 0; i < 4; i++) {
	if (cl->zsActive[i])
	    deflateEnd(&cl->zsStruct[i]);
    }
#endif
#endif

    if (cl->screen->pointerClient == cl)
        cl->screen->pointerClient = NULL;

    sraRgnDestroy(cl->modifiedRegion);
    sraRgnDestroy(cl->requestedRegion);
    sraRgnDestroy(cl->copyRegion);

    if (cl->translateLookupTable) free(cl->translateLookupTable);

    TINI_COND(cl->updateCond);
    TINI_MUTEX(cl->updateMutex);

    /* make sure outputMutex is unlocked before destroying */
    LOCK(cl->outputMutex);
    UNLOCK(cl->outputMutex);
    TINI_MUTEX(cl->outputMutex);

#ifdef CORBA
    destroyConnection(cl);
#endif

    rfbPrintStats(cl);

    free(cl);
}


/*
 * rfbProcessClientMessage is called when there is data to read from a client.
 */

void
rfbProcessClientMessage(rfbClientPtr cl)
{
    switch (cl->state) {
    case RFB_PROTOCOL_VERSION:
        rfbProcessClientProtocolVersion(cl);
        return;
    case RFB_SECURITY_TYPE:
        rfbProcessClientSecurityType(cl);
        return;
    case RFB_AUTHENTICATION:
        rfbAuthProcessClientMessage(cl);
        return;
    case RFB_INITIALISATION:
        rfbProcessClientInitMessage(cl);
        return;
    default:
        rfbProcessClientNormalMessage(cl);
        return;
    }
}


/*
 * rfbProcessClientProtocolVersion is called when the client sends its
 * protocol version.
 */

static void
rfbProcessClientProtocolVersion(rfbClientPtr cl)
{
    rfbProtocolVersionMsg pv;
    int n, major_, minor_;

    if ((n = rfbReadExact(cl, pv, sz_rfbProtocolVersionMsg)) <= 0) {
        if (n == 0)
            rfbLog("rfbProcessClientProtocolVersion: client gone\n");
        else
            rfbLogPerror("rfbProcessClientProtocolVersion: read");
        rfbCloseClient(cl);
        return;
    }

    pv[sz_rfbProtocolVersionMsg] = 0;
    if (sscanf(pv,rfbProtocolVersionFormat,&major_,&minor_) != 2) {
        char name[1024]; 
	if(sscanf(pv,"RFB %03d.%03d %1023s\n",&major_,&minor_,name) != 3) {
	    rfbErr("rfbProcessClientProtocolVersion: not a valid RFB client: %s\n", pv);
	    rfbCloseClient(cl);
	    return;
	}
	free(cl->host);
	cl->host=strdup(name);
    }
    rfbLog("Client Protocol Version %d.%d\n", major_, minor_);

    if (major_ != rfbProtocolMajorVersion) {
        rfbErr("RFB protocol version mismatch - server %d.%d, client %d.%d",
                cl->screen->protocolMajorVersion, cl->screen->protocolMinorVersion,
                major_,minor_);
        rfbCloseClient(cl);
        return;
    }

    /* Check for the minor version use either of the two standard version of RFB */
    /*
     * UltraVNC Viewer detects FileTransfer compatible servers via rfb versions
     * 3.4, 3.6, 3.14, 3.16
     * It's a bad method, but it is what they use to enable features...
     * maintaining RFB version compatibility across multiple servers is a pain
     * Should use something like ServerIdentity encoding
     */
    cl->protocolMajorVersion = major_;
    cl->protocolMinorVersion = minor_;
    
    rfbLog("Protocol version sent %d.%d, using %d.%d\n",
              major_, minor_, rfbProtocolMajorVersion, cl->protocolMinorVersion);

    rfbAuthNewClient(cl);
}


void
rfbClientSendString(rfbClientPtr cl, char *reason)
{
    char *buf;
    int len = strlen(reason);

    rfbLog("rfbClientSendString(\"%s\")\n", reason);

    buf = (char *)malloc(4 + len);
    ((uint32_t *)buf)[0] = Swap32IfLE(len);
    memcpy(buf + 4, reason, len);

    if (rfbWriteExact(cl, buf, 4 + len) < 0)
        rfbLogPerror("rfbClientSendString: write");
    free(buf);

    rfbCloseClient(cl);
}

/*
 * rfbClientConnFailed is called when a client connection has failed either
 * because it talks the wrong protocol or it has failed authentication.
 */

void
rfbClientConnFailed(rfbClientPtr cl,
                    char *reason)
{
    char *buf;
    int len = strlen(reason);

    rfbLog("rfbClientConnFailed(\"%s\")\n", reason);

    buf = (char *)malloc(8 + len);
    ((uint32_t *)buf)[0] = Swap32IfLE(rfbConnFailed);
    ((uint32_t *)buf)[1] = Swap32IfLE(len);
    memcpy(buf + 8, reason, len);

    if (rfbWriteExact(cl, buf, 8 + len) < 0)
        rfbLogPerror("rfbClientConnFailed: write");
    free(buf);

    rfbCloseClient(cl);
}


/*
 * rfbProcessClientInitMessage is called when the client sends its
 * initialisation message.
 */

static void
rfbProcessClientInitMessage(rfbClientPtr cl)
{
    rfbClientInitMsg ci;
    char buf[256];
    rfbServerInitMsg *si = (rfbServerInitMsg *)buf;
    int len, n;
    rfbClientIteratorPtr iterator;
    rfbClientPtr otherCl;
    rfbExtensionData* extension;

    if ((n = rfbReadExact(cl, (char *)&ci,sz_rfbClientInitMsg)) <= 0) {
        if (n == 0)
            rfbLog("rfbProcessClientInitMessage: client gone\n");
        else
            rfbLogPerror("rfbProcessClientInitMessage: read");
        rfbCloseClient(cl);
        return;
    }

    memset(buf,0,sizeof(buf));

    si->framebufferWidth = Swap16IfLE(cl->screen->width);
    si->framebufferHeight = Swap16IfLE(cl->screen->height);
    si->format = cl->screen->serverFormat;
    si->format.redMax = Swap16IfLE(si->format.redMax);
    si->format.greenMax = Swap16IfLE(si->format.greenMax);
    si->format.blueMax = Swap16IfLE(si->format.blueMax);

    strncpy(buf + sz_rfbServerInitMsg, cl->screen->desktopName, 127);
    len = strlen(buf + sz_rfbServerInitMsg);
    si->nameLength = Swap32IfLE(len);

    if (rfbWriteExact(cl, buf, sz_rfbServerInitMsg + len) < 0) {
        rfbLogPerror("rfbProcessClientInitMessage: write");
        rfbCloseClient(cl);
        return;
    }

    for(extension = cl->extensions; extension;) {
	rfbExtensionData* next = extension->next;
	if(extension->extension->init &&
		!extension->extension->init(cl, extension->data))
	    /* extension requested that it be removed */
	    rfbDisableExtension(cl, extension->extension);
	extension = next;
    }

    cl->state = RFB_NORMAL;

    if (!cl->reverseConnection &&
                        (cl->screen->neverShared || (!cl->screen->alwaysShared && !ci.shared))) {

        if (cl->screen->dontDisconnect) {
            iterator = rfbGetClientIterator(cl->screen);
            while ((otherCl = rfbClientIteratorNext(iterator)) != NULL) {
                if ((otherCl != cl) && (otherCl->state == RFB_NORMAL)) {
                    rfbLog("-dontdisconnect: Not shared & existing client\n");
                    rfbLog("  refusing new client %s\n", cl->host);
                    rfbCloseClient(cl);
                    rfbReleaseClientIterator(iterator);
                    return;
                }
            }
            rfbReleaseClientIterator(iterator);
        } else {
            iterator = rfbGetClientIterator(cl->screen);
            while ((otherCl = rfbClientIteratorNext(iterator)) != NULL) {
                if ((otherCl != cl) && (otherCl->state == RFB_NORMAL)) {
                    rfbLog("Not shared - closing connection to client %s\n",
                           otherCl->host);
                    rfbCloseClient(otherCl);
                }
            }
            rfbReleaseClientIterator(iterator);
        }
    }
}

/* The values come in based on the scaled screen, we need to convert them to
 * values based on the man screen's coordinate system
 */
static rfbBool rectSwapIfLEAndClip(uint16_t* x,uint16_t* y,uint16_t* w,uint16_t* h,
		rfbClientPtr cl)
{
	int x1=Swap16IfLE(*x);
	int y1=Swap16IfLE(*y);
	int w1=Swap16IfLE(*w);
	int h1=Swap16IfLE(*h);

	rfbScaledCorrection(cl->scaledScreen, cl->screen, &x1, &y1, &w1, &h1, "rectSwapIfLEAndClip");
	*x = x1;
	*y = y1;
	*w = w1;
	*h = h1;

	if(*w>cl->screen->width-*x)
		*w=cl->screen->width-*x;
	/* possible underflow */
	if(*w>cl->screen->width-*x)
		return FALSE;
	if(*h>cl->screen->height-*y)
		*h=cl->screen->height-*y;
	if(*h>cl->screen->height-*y)
		return FALSE;

	return TRUE;
}

/*
 * Send keyboard state (PointerPos pseudo-encoding).
 */

rfbBool
rfbSendKeyboardLedState(rfbClientPtr cl)
{
    rfbFramebufferUpdateRectHeader rect;

    if (cl->ublen + sz_rfbFramebufferUpdateRectHeader > UPDATE_BUF_SIZE) {
        if (!rfbSendUpdateBuf(cl))
            return FALSE;
    }

    rect.encoding = Swap32IfLE(rfbEncodingKeyboardLedState);
    rect.r.x = Swap16IfLE(cl->lastKeyboardLedState);
    rect.r.y = 0;
    rect.r.w = 0;
    rect.r.h = 0;

    memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,
        sz_rfbFramebufferUpdateRectHeader);
    cl->ublen += sz_rfbFramebufferUpdateRectHeader;

    rfbStatRecordEncodingSent(cl, rfbEncodingKeyboardLedState, sz_rfbFramebufferUpdateRectHeader, sz_rfbFramebufferUpdateRectHeader);

    if (!rfbSendUpdateBuf(cl))
        return FALSE;

    return TRUE;
}


#define rfbSetBit(buffer, position)  (buffer[(position & 255) / 8] |= (1 << (position % 8)))

/*
 * Send rfbEncodingSupportedMessages.
 */

rfbBool
rfbSendSupportedMessages(rfbClientPtr cl)
{
    rfbFramebufferUpdateRectHeader rect;
    rfbSupportedMessages msgs;

    if (cl->ublen + sz_rfbFramebufferUpdateRectHeader
                  + sz_rfbSupportedMessages > UPDATE_BUF_SIZE) {
        if (!rfbSendUpdateBuf(cl))
            return FALSE;
    }

    rect.encoding = Swap32IfLE(rfbEncodingSupportedMessages);
    rect.r.x = 0;
    rect.r.y = 0;
    rect.r.w = Swap16IfLE(sz_rfbSupportedMessages);
    rect.r.h = 0;

    memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,
        sz_rfbFramebufferUpdateRectHeader);
    cl->ublen += sz_rfbFramebufferUpdateRectHeader;

    memset((char *)&msgs, 0, sz_rfbSupportedMessages);
    rfbSetBit(msgs.client2server, rfbSetPixelFormat);
    rfbSetBit(msgs.client2server, rfbFixColourMapEntries);
    rfbSetBit(msgs.client2server, rfbSetEncodings);
    rfbSetBit(msgs.client2server, rfbFramebufferUpdateRequest);
    rfbSetBit(msgs.client2server, rfbKeyEvent);
    rfbSetBit(msgs.client2server, rfbPointerEvent);
    rfbSetBit(msgs.client2server, rfbClientCutText);
    rfbSetBit(msgs.client2server, rfbFileTransfer);
    rfbSetBit(msgs.client2server, rfbSetScale);
    /*rfbSetBit(msgs.client2server, rfbSetServerInput);  */
    /*rfbSetBit(msgs.client2server, rfbSetSW);           */
    /*rfbSetBit(msgs.client2server, rfbTextChat);        */
    /*rfbSetBit(msgs.client2server, rfbKeyFrameRequest); */
    rfbSetBit(msgs.client2server, rfbPalmVNCSetScaleFactor);

    rfbSetBit(msgs.server2client, rfbFramebufferUpdate);
    rfbSetBit(msgs.server2client, rfbSetColourMapEntries);
    rfbSetBit(msgs.server2client, rfbBell);
    rfbSetBit(msgs.server2client, rfbServerCutText);
    rfbSetBit(msgs.server2client, rfbResizeFrameBuffer);
    /*rfbSetBit(msgs.server2client, rfbKeyFrameUpdate);  */
    rfbSetBit(msgs.server2client, rfbPalmVNCReSizeFrameBuffer);

    memcpy(&cl->updateBuf[cl->ublen], (char *)&msgs, sz_rfbSupportedMessages);
    cl->ublen += sz_rfbSupportedMessages;

    rfbStatRecordEncodingSent(cl, rfbEncodingSupportedMessages,
        sz_rfbFramebufferUpdateRectHeader+sz_rfbSupportedMessages,
        sz_rfbFramebufferUpdateRectHeader+sz_rfbSupportedMessages);
    if (!rfbSendUpdateBuf(cl))
        return FALSE;

    return TRUE;
}



static void rfbSendSupporteddEncodings_SendEncoding(rfbClientPtr cl, uint32_t enc)
{
    uint32_t nSwapped=0;
    nSwapped = Swap32IfLE(enc);
    memcpy(&cl->updateBuf[cl->ublen], (char *)&nSwapped, sizeof(nSwapped));
    cl->ublen+=sizeof(nSwapped);
}


/*
 * Send rfbEncodingSupportedEncodings.
 */

rfbBool
rfbSendSupportedEncodings(rfbClientPtr cl)
{
    rfbFramebufferUpdateRectHeader rect;
    uint16_t nEncodings=0;
    
    /* think rfbSetEncodingsMsg */

    /* TODO: dynamic way of doing this */
    nEncodings=16;
#ifdef LIBVNCSERVER_HAVE_LIBZ
    nEncodings += 2;
#endif
#ifdef LIBVNCSERVER_HAVE_LIBZ
    nEncodings++;
#endif

    if (cl->ublen + sz_rfbFramebufferUpdateRectHeader
                  + (nEncodings*sizeof(uint32_t)) > UPDATE_BUF_SIZE) {
        if (!rfbSendUpdateBuf(cl))
            return FALSE;
    }

    rect.encoding = Swap32IfLE(rfbEncodingSupportedEncodings);
    rect.r.x = 0;
    rect.r.y = 0;
    rect.r.w = Swap16IfLE(nEncodings * sizeof(uint32_t));
    rect.r.h = Swap16IfLE(nEncodings);

    memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,
        sz_rfbFramebufferUpdateRectHeader);
    cl->ublen += sz_rfbFramebufferUpdateRectHeader;

    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingRaw);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingCopyRect);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingRRE);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingCoRRE);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingHextile);
#ifdef LIBVNCSERVER_HAVE_LIBZ
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingZlib);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingTight);
#endif
#ifdef LIBVNCSERVER_HAVE_LIBZ
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingZRLE);
#endif
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingUltra);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingUltraZip);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingXCursor);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingRichCursor);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingPointerPos);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingLastRect);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingNewFBSize);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingKeyboardLedState);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingSupportedMessages);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingSupportedEncodings);
    rfbSendSupporteddEncodings_SendEncoding(cl, rfbEncodingServerIdentity);

    rfbStatRecordEncodingSent(cl, rfbEncodingSupportedEncodings,
        sz_rfbFramebufferUpdateRectHeader+(nEncodings * sizeof(uint32_t)),
        sz_rfbFramebufferUpdateRectHeader+(nEncodings * sizeof(uint32_t)));

    if (!rfbSendUpdateBuf(cl))
        return FALSE;

    return TRUE;
}


void
rfbSetServerVersionIdentity(rfbScreenInfoPtr screen, char *fmt, ...)
{
    char buffer[256];
    va_list ap;
    
    va_start(ap, fmt);
    vsnprintf(buffer, sizeof(buffer)-1, fmt, ap);
    va_end(ap);
    
    if (screen->versionString!=NULL) free(screen->versionString);
    screen->versionString = strdup(buffer);
}

/*
 * Send rfbEncodingServerIdentity.
 */

rfbBool
rfbSendServerIdentity(rfbClientPtr cl)
{
    rfbFramebufferUpdateRectHeader rect;
    char buffer[512];

    /* tack on our library version */
    snprintf(buffer,sizeof(buffer)-1, "%s (%s)", 
        (cl->screen->versionString==NULL ? "unknown" : cl->screen->versionString),
        LIBVNCSERVER_PACKAGE_STRING);

    if (cl->ublen + sz_rfbFramebufferUpdateRectHeader
                  + (strlen(buffer)+1) > UPDATE_BUF_SIZE) {
        if (!rfbSendUpdateBuf(cl))
            return FALSE;
    }

    rect.encoding = Swap32IfLE(rfbEncodingServerIdentity);
    rect.r.x = 0;
    rect.r.y = 0;
    rect.r.w = Swap16IfLE(strlen(buffer)+1);
    rect.r.h = 0;

    memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,
        sz_rfbFramebufferUpdateRectHeader);
    cl->ublen += sz_rfbFramebufferUpdateRectHeader;

    memcpy(&cl->updateBuf[cl->ublen], buffer, strlen(buffer)+1);
    cl->ublen += strlen(buffer)+1;

    rfbStatRecordEncodingSent(cl, rfbEncodingServerIdentity,
        sz_rfbFramebufferUpdateRectHeader+strlen(buffer)+1,
        sz_rfbFramebufferUpdateRectHeader+strlen(buffer)+1);
    

    if (!rfbSendUpdateBuf(cl))
        return FALSE;

    return TRUE;
}

rfbBool rfbSendTextChatMessage(rfbClientPtr cl, uint32_t length, char *buffer)
{
    rfbTextChatMsg tc;
    int bytesToSend=0;

    memset((char *)&tc, 0, sizeof(tc)); 
    tc.type = rfbTextChat;
    tc.length = Swap32IfLE(length);
    
    switch(length) {
    case rfbTextChatOpen:
    case rfbTextChatClose:
    case rfbTextChatFinished:
        bytesToSend=0;
        break;
    default:
        bytesToSend=length;
        if (bytesToSend>rfbTextMaxSize)
            bytesToSend=rfbTextMaxSize;
    }

    if (cl->ublen + sz_rfbTextChatMsg + bytesToSend > UPDATE_BUF_SIZE) {
        if (!rfbSendUpdateBuf(cl))
            return FALSE;
    }
    
    memcpy(&cl->updateBuf[cl->ublen], (char *)&tc, sz_rfbTextChatMsg);
    cl->ublen += sz_rfbTextChatMsg;
    if (bytesToSend>0) {
        memcpy(&cl->updateBuf[cl->ublen], buffer, bytesToSend);
        cl->ublen += bytesToSend;    
    }
    rfbStatRecordMessageSent(cl, rfbTextChat, sz_rfbTextChatMsg+bytesToSend, sz_rfbTextChatMsg+bytesToSend);

    if (!rfbSendUpdateBuf(cl))
        return FALSE;
        
    return TRUE;
}

#define FILEXFER_ALLOWED_OR_CLOSE_AND_RETURN(msg, cl, ret) \
	if ((cl->screen->getFileTransferPermission != NULL \
	    && cl->screen->getFileTransferPermission(cl) != TRUE) \
	    || cl->screen->permitFileTransfer != TRUE) { \
		rfbLog("%sUltra File Transfer is disabled, dropping client: %s\n", msg, cl->host); \
		rfbCloseClient(cl); \
		return ret; \
	}

int DB = 1;

rfbBool rfbSendFileTransferMessage(rfbClientPtr cl, uint8_t contentType, uint8_t contentParam, uint32_t size, uint32_t length, char *buffer)
{
    rfbFileTransferMsg ft;
    ft.type = rfbFileTransfer;
    ft.contentType = contentType;
    ft.contentParam = contentParam;
    ft.pad          = 0; /* UltraVNC did not Swap16LE(ft.contentParam) (Looks like it might be BigEndian) */
    ft.size         = Swap32IfLE(size);
    ft.length       = Swap32IfLE(length);
    
    FILEXFER_ALLOWED_OR_CLOSE_AND_RETURN("", cl, FALSE);
    /*
    rfbLog("rfbSendFileTransferMessage( %dtype, %dparam, %dsize, %dlen, %p)\n", contentType, contentParam, size, length, buffer);
    */
    if (rfbWriteExact(cl, (char *)&ft, sz_rfbFileTransferMsg) < 0) {
        rfbLogPerror("rfbSendFileTransferMessage: write");
        rfbCloseClient(cl);
        return FALSE;
    }

    if (length>0)
    {
        if (rfbWriteExact(cl, buffer, length) < 0) {
            rfbLogPerror("rfbSendFileTransferMessage: write");
            rfbCloseClient(cl);
            return FALSE;
        }
    }

    rfbStatRecordMessageSent(cl, rfbFileTransfer, sz_rfbFileTransferMsg+length, sz_rfbFileTransferMsg+length);

    return TRUE;
}


/*
 * UltraVNC uses Windows Structures
 */
#define MAX_PATH 260

typedef struct {
    uint32_t dwLowDateTime;
    uint32_t dwHighDateTime;
} RFB_FILETIME; 

typedef struct {
    uint32_t dwFileAttributes;
    RFB_FILETIME ftCreationTime;
    RFB_FILETIME ftLastAccessTime;
    RFB_FILETIME ftLastWriteTime;
    uint32_t nFileSizeHigh;
    uint32_t nFileSizeLow;
    uint32_t dwReserved0;
    uint32_t dwReserved1;
    uint8_t  cFileName[ MAX_PATH ];
    uint8_t  cAlternateFileName[ 14 ];
} RFB_FIND_DATA;

#define RFB_FILE_ATTRIBUTE_READONLY   0x1
#define RFB_FILE_ATTRIBUTE_HIDDEN     0x2
#define RFB_FILE_ATTRIBUTE_SYSTEM     0x4
#define RFB_FILE_ATTRIBUTE_DIRECTORY  0x10
#define RFB_FILE_ATTRIBUTE_ARCHIVE    0x20
#define RFB_FILE_ATTRIBUTE_NORMAL     0x80
#define RFB_FILE_ATTRIBUTE_TEMPORARY  0x100
#define RFB_FILE_ATTRIBUTE_COMPRESSED 0x800

rfbBool rfbFilenameTranslate2UNIX(rfbClientPtr cl, char *path, char *unixPath)
{
    int x;
    char *home=NULL;

    FILEXFER_ALLOWED_OR_CLOSE_AND_RETURN("", cl, FALSE);

    /* C: */
    if (path[0]=='C' && path[1]==':')
      strcpy(unixPath, &path[2]);
    else
    {
      home = getenv("HOME");
      if (home!=NULL)
      {
        strcpy(unixPath, home);
        strcat(unixPath,"/");
        strcat(unixPath, path);
      }
      else
        strcpy(unixPath, path);
    }
    for (x=0;x<strlen(unixPath);x++)
      if (unixPath[x]=='\\') unixPath[x]='/';
    return TRUE;
}

rfbBool rfbFilenameTranslate2DOS(rfbClientPtr cl, char *unixPath, char *path)
{
    int x;

    FILEXFER_ALLOWED_OR_CLOSE_AND_RETURN("", cl, FALSE);

    sprintf(path,"C:%s", unixPath);
    for (x=2;x<strlen(path);x++)
        if (path[x]=='/') path[x]='\\';
    return TRUE;
}

rfbBool rfbSendDirContent(rfbClientPtr cl, int length, char *buffer)
{
    char retfilename[MAX_PATH];
    char path[MAX_PATH];
    struct stat statbuf;
    RFB_FIND_DATA win32filename;
    int nOptLen = 0, retval=0;
    DIR *dirp=NULL;
    struct dirent *direntp=NULL;

    FILEXFER_ALLOWED_OR_CLOSE_AND_RETURN("", cl, FALSE);

    /* Client thinks we are Winblows */
    rfbFilenameTranslate2UNIX(cl, buffer, path);

    if (DB) rfbLog("rfbProcessFileTransfer() rfbDirContentRequest: rfbRDirContent: \"%s\"->\"%s\"\n",buffer, path);

    dirp=opendir(path);
    if (dirp==NULL)
        return rfbSendFileTransferMessage(cl, rfbDirPacket, rfbADirectory, 0, 0, NULL);
    /* send back the path name (necessary for links) */
    if (rfbSendFileTransferMessage(cl, rfbDirPacket, rfbADirectory, 0, length, buffer)==FALSE) return FALSE;
    for (direntp=readdir(dirp); direntp!=NULL; direntp=readdir(dirp))
    {
        /* get stats */
        snprintf(retfilename,sizeof(retfilename),"%s/%s", path, direntp->d_name);
        retval = stat(retfilename, &statbuf);

        if (retval==0)
        {
            memset((char *)&win32filename, 0, sizeof(win32filename));
            win32filename.dwFileAttributes = Swap32IfBE(RFB_FILE_ATTRIBUTE_NORMAL);
            if (S_ISDIR(statbuf.st_mode))
              win32filename.dwFileAttributes = Swap32IfBE(RFB_FILE_ATTRIBUTE_DIRECTORY);
            win32filename.ftCreationTime.dwLowDateTime = Swap32IfBE(statbuf.st_ctime);   /* Intel Order */
            win32filename.ftCreationTime.dwHighDateTime = 0;
            win32filename.ftLastAccessTime.dwLowDateTime = Swap32IfBE(statbuf.st_atime); /* Intel Order */
            win32filename.ftLastAccessTime.dwHighDateTime = 0;
            win32filename.ftLastWriteTime.dwLowDateTime = Swap32IfBE(statbuf.st_mtime);  /* Intel Order */
            win32filename.ftLastWriteTime.dwHighDateTime = 0;
            win32filename.nFileSizeLow = Swap32IfBE(statbuf.st_size); /* Intel Order */
            win32filename.nFileSizeHigh = 0;
            win32filename.dwReserved0 = 0;
            win32filename.dwReserved1 = 0;

            /* If this had the full path, we would need to translate to DOS format ("C:\") */
            /* rfbFilenameTranslate2DOS(cl, retfilename, win32filename.cFileName); */
            strcpy((char *)win32filename.cFileName, direntp->d_name);
            
            /* Do not show hidden files (but show how to move up the tree) */
            if ((strcmp(direntp->d_name, "..")==0) || (direntp->d_name[0]!='.'))
            {
                nOptLen = sizeof(RFB_FIND_DATA) - MAX_PATH - 14 + strlen((char *)win32filename.cFileName);
                /*
                rfbLog("rfbProcessFileTransfer() rfbDirContentRequest: rfbRDirContent: Sending \"%s\"\n", (char *)win32filename.cFileName);
                */
                if (rfbSendFileTransferMessage(cl, rfbDirPacket, rfbADirectory, 0, nOptLen, (char *)&win32filename)==FALSE) return FALSE;
            }
        }
    }
    closedir(dirp);
    /* End of the transfer */
    return rfbSendFileTransferMessage(cl, rfbDirPacket, 0, 0, 0, NULL);
}


char *rfbProcessFileTransferReadBuffer(rfbClientPtr cl, uint32_t length)
{
    char *buffer=NULL;
    int   n=0;

    FILEXFER_ALLOWED_OR_CLOSE_AND_RETURN("", cl, NULL);
    /*
    rfbLog("rfbProcessFileTransferReadBuffer(%dlen)\n", length);
    */
    if (length>0) {
        buffer=malloc(length+1);
        if (buffer!=NULL) {
            if ((n = rfbReadExact(cl, (char *)buffer, length)) <= 0) {
                if (n != 0)
                    rfbLogPerror("rfbProcessFileTransferReadBuffer: read");
                rfbCloseClient(cl);
                /* NOTE: don't forget to free(buffer) if you return early! */
                if (buffer!=NULL) free(buffer);
                return NULL;
            }
            /* Null Terminate */
            buffer[length]=0;
        }
    }
    return buffer;
}


rfbBool rfbSendFileTransferChunk(rfbClientPtr cl)
{
    /* Allocate buffer for compression */
    unsigned char readBuf[sz_rfbBlockSize];
    int bytesRead=0;
    int retval=0;
    fd_set wfds;
    struct timeval tv;
    int n;
#ifdef LIBVNCSERVER_HAVE_LIBZ
    unsigned char compBuf[sz_rfbBlockSize + 1024];
    unsigned long nMaxCompSize = sizeof(compBuf);
    int nRetC = 0;
#endif

    /*
     * Don't close the client if we get into this one because 
     * it is called from many places to service file transfers.
     * Note that permitFileTransfer is checked first.
     */
    if (cl->screen->permitFileTransfer != TRUE ||
       (cl->screen->getFileTransferPermission != NULL
        && cl->screen->getFileTransferPermission(cl) != TRUE)) { 
		return TRUE;
    }

    /* If not sending, or no file open...   Return as if we sent something! */
    if ((cl->fileTransfer.fd!=-1) && (cl->fileTransfer.sending==1))
    {
	FD_ZERO(&wfds);
        FD_SET(cl->sock, &wfds);

        /* return immediately */
	tv.tv_sec = 0; 
	tv.tv_usec = 0;
	n = select(cl->sock + 1, NULL, &wfds, NULL, &tv);

	if (n<0) {
            rfbLog("rfbSendFileTransferChunk() select failed: %s\n", strerror(errno));
	}
        /* We have space on the transmit queue */
	if (n > 0)
	{
            bytesRead = read(cl->fileTransfer.fd, readBuf, sz_rfbBlockSize);
            switch (bytesRead) {
            case 0:
                /*
                rfbLog("rfbSendFileTransferChunk(): End-Of-File Encountered\n");
                */
                retval = rfbSendFileTransferMessage(cl, rfbEndOfFile, 0, 0, 0, NULL);
                close(cl->fileTransfer.fd);
                cl->fileTransfer.fd = -1;
                cl->fileTransfer.sending   = 0;
                cl->fileTransfer.receiving = 0;
                return retval;
            case -1:
                /* TODO : send an error msg to the client... */
                rfbLog("rfbSendFileTransferChunk(): %s\n",strerror(errno));
                retval = rfbSendFileTransferMessage(cl, rfbAbortFileTransfer, 0, 0, 0, NULL);
                close(cl->fileTransfer.fd);
                cl->fileTransfer.fd = -1;
                cl->fileTransfer.sending   = 0;
                cl->fileTransfer.receiving = 0;
                return retval;
            default:
                /*
                rfbLog("rfbSendFileTransferChunk(): Read %d bytes\n", bytesRead);
                */
                if (!cl->fileTransfer.compressionEnabled)
                    return  rfbSendFileTransferMessage(cl, rfbFilePacket, 0, 0, bytesRead, (char *)readBuf);
                else
                {
#ifdef LIBVNCSERVER_HAVE_LIBZ
                    nRetC = compress(compBuf, &nMaxCompSize, readBuf, bytesRead);
                    /*
                    rfbLog("Compressed the packet from %d -> %d bytes\n", nMaxCompSize, bytesRead);
                    */
                    
                    if ((nRetC==0) && (nMaxCompSize<bytesRead))
                        return  rfbSendFileTransferMessage(cl, rfbFilePacket, 0, 1, nMaxCompSize, (char *)compBuf);
                    else
                        return  rfbSendFileTransferMessage(cl, rfbFilePacket, 0, 0, bytesRead, (char *)readBuf);
#else
                    /* We do not support compression of the data stream */
                    return  rfbSendFileTransferMessage(cl, rfbFilePacket, 0, 0, bytesRead, (char *)readBuf);
#endif
                }
            }
        }
    }
    return TRUE;
}

rfbBool rfbProcessFileTransfer(rfbClientPtr cl, uint8_t contentType, uint8_t contentParam, uint32_t size, uint32_t length)
{
    char *buffer=NULL, *p=NULL;
    int retval=0;
    char filename1[MAX_PATH];
    char filename2[MAX_PATH];
    char szFileTime[MAX_PATH];
    struct stat statbuf;
    uint32_t sizeHtmp=0;
    int n=0;
    char timespec[64];
#ifdef LIBVNCSERVER_HAVE_LIBZ
    unsigned char compBuff[sz_rfbBlockSize];
    unsigned long nRawBytes = sz_rfbBlockSize;
    int nRet = 0;
#endif

    FILEXFER_ALLOWED_OR_CLOSE_AND_RETURN("", cl, FALSE);
        
    /*
    rfbLog("rfbProcessFileTransfer(%dtype, %dparam, %dsize, %dlen)\n", contentType, contentParam, size, length);
    */

    switch (contentType) {
    case rfbDirContentRequest:
        switch (contentParam) {
        case rfbRDrivesList: /* Client requests the List of Local Drives */
            /*
            rfbLog("rfbProcessFileTransfer() rfbDirContentRequest: rfbRDrivesList:\n");
            */
            /* Format when filled : "C:\<NULL>D:\<NULL>....Z:\<NULL><NULL>
             *
             * We replace the "\" char following the drive letter and ":"
             * with a char corresponding to the type of drive
             * We obtain something like "C:l<NULL>D:c<NULL>....Z:n\<NULL><NULL>"
             *  Isn't it ugly ?
             * DRIVE_FIXED = 'l'     (local?)
             * DRIVE_REMOVABLE = 'f' (floppy?)
             * DRIVE_CDROM = 'c'
             * DRIVE_REMOTE = 'n'
             */
            
            /* in unix, there are no 'drives'  (We could list mount points though)
             * We fake the root as a "C:" for the Winblows users
             */
            filename2[0]='C';
            filename2[1]=':';
            filename2[2]='l';
            filename2[3]=0;
            filename2[4]=0;
            retval = rfbSendFileTransferMessage(cl, rfbDirPacket, rfbADrivesList, 0, 5, filename2);
            if (buffer!=NULL) free(buffer);
            return retval;
            break;
        case rfbRDirContent: /* Client requests the content of a directory */
            /*
            rfbLog("rfbProcessFileTransfer() rfbDirContentRequest: rfbRDirContent\n");
            */
            if ((buffer = rfbProcessFileTransferReadBuffer(cl, length))==NULL) return FALSE;
            retval = rfbSendDirContent(cl, length, buffer);
            if (buffer!=NULL) free(buffer);
            return retval;
        }
        break;

    case rfbDirPacket:
        rfbLog("rfbProcessFileTransfer() rfbDirPacket\n");
        break;
    case rfbFileAcceptHeader:
        rfbLog("rfbProcessFileTransfer() rfbFileAcceptHeader\n");
        break;
    case rfbCommandReturn:
        rfbLog("rfbProcessFileTransfer() rfbCommandReturn\n");
        break;
    case rfbFileChecksums:
        /* Destination file already exists - the viewer sends the checksums */
        rfbLog("rfbProcessFileTransfer() rfbFileChecksums\n");
        break;
    case rfbFileTransferAccess:
        rfbLog("rfbProcessFileTransfer() rfbFileTransferAccess\n");
        break;

    /*
     * sending from the server to the viewer
     */

    case rfbFileTransferRequest:
        /*
        rfbLog("rfbProcessFileTransfer() rfbFileTransferRequest:\n");
        */
        /* add some space to the end of the buffer as we will be adding a timespec to it */
        if ((buffer = rfbProcessFileTransferReadBuffer(cl, length))==NULL) return FALSE;
        /* The client requests a File */
        rfbFilenameTranslate2UNIX(cl, buffer, filename1);
        cl->fileTransfer.fd=open(filename1, O_RDONLY, 0744);

        /*
        */
        if (DB) rfbLog("rfbProcessFileTransfer() rfbFileTransferRequest(\"%s\"->\"%s\") Open: %s fd=%d\n", buffer, filename1, (cl->fileTransfer.fd==-1?"Failed":"Success"), cl->fileTransfer.fd);
        
        if (cl->fileTransfer.fd!=-1) {
            if (fstat(cl->fileTransfer.fd, &statbuf)!=0) {
                close(cl->fileTransfer.fd);
                cl->fileTransfer.fd=-1;
            }
            else
            {
              /* Add the File Time Stamp to the filename */
              strftime(timespec, sizeof(timespec), "%m/%d/%Y %H:%M",gmtime(&statbuf.st_ctime));
              buffer=realloc(buffer, length + strlen(timespec) + 2); /* comma, and Null term */
              if (buffer==NULL) {
                  rfbLog("rfbProcessFileTransfer() rfbFileTransferRequest: Failed to malloc %d bytes\n", length + strlen(timespec) + 2);
                  return FALSE;
              }
              strcat(buffer,",");
              strcat(buffer, timespec);
              length = strlen(buffer);
              if (DB) rfbLog("rfbProcessFileTransfer() buffer is now: \"%s\"\n", buffer);
            }
        }

        /* The viewer supports compression if size==1 */
        cl->fileTransfer.compressionEnabled = (size==1);

        /*
        rfbLog("rfbProcessFileTransfer() rfbFileTransferRequest(\"%s\"->\"%s\")%s\n", buffer, filename1, (size==1?" <Compression Enabled>":""));
        */

        /* File Size in bytes, 0xFFFFFFFF (-1) means error */
        retval = rfbSendFileTransferMessage(cl, rfbFileHeader, 0, (cl->fileTransfer.fd==-1 ? -1 : statbuf.st_size), length, buffer);

        if (cl->fileTransfer.fd==-1)
        {
            if (buffer!=NULL) free(buffer);
            return retval;
        }
        /* setup filetransfer stuff */
        cl->fileTransfer.fileSize = statbuf.st_size;
        cl->fileTransfer.numPackets = statbuf.st_size / sz_rfbBlockSize;
        cl->fileTransfer.receiving = 0;
        cl->fileTransfer.sending = 0; /* set when we receive a rfbFileHeader: */

        /* TODO: finish 64-bit file size support */
        sizeHtmp = 0;        
        if (rfbWriteExact(cl, (char *)&sizeHtmp, 4) < 0) {
          rfbLogPerror("rfbProcessFileTransfer: write");
          rfbCloseClient(cl);
          if (buffer!=NULL) free(buffer);
          return FALSE;
        }
        break;

    case rfbFileHeader:
        /* Destination file (viewer side) is ready for reception (size > 0) or not (size = -1) */
        if (size==-1) {
            rfbLog("rfbProcessFileTransfer() rfbFileHeader (error, aborting)\n");
            close(cl->fileTransfer.fd);
            cl->fileTransfer.fd=-1;
            return TRUE;
        }

        /*
        rfbLog("rfbProcessFileTransfer() rfbFileHeader (%d bytes of a file)\n", size);
        */

        /* Starts the transfer! */
        cl->fileTransfer.sending=1;
        return rfbSendFileTransferChunk(cl);
        break;


    /*
     * sending from the viewer to the server
     */

    case rfbFileTransferOffer:
        /* client is sending a file to us */
        /* buffer contains full path name (plus FileTime) */
        /* size contains size of the file */
        /*
        rfbLog("rfbProcessFileTransfer() rfbFileTransferOffer:\n");
        */
        if ((buffer = rfbProcessFileTransferReadBuffer(cl, length))==NULL) return FALSE;

        /* Parse the FileTime */
        p = strrchr(buffer, ',');
        if (p!=NULL) {
            *p = '\0';
            strcpy(szFileTime, p+1);
        } else
            szFileTime[0]=0;



        /* Need to read in sizeHtmp */
        if ((n = rfbReadExact(cl, (char *)&sizeHtmp, 4)) <= 0) {
            if (n != 0)
                rfbLogPerror("rfbProcessFileTransfer: read sizeHtmp");
            rfbCloseClient(cl);
            /* NOTE: don't forget to free(buffer) if you return early! */
            if (buffer!=NULL) free(buffer);
            return FALSE;
        }
        sizeHtmp = Swap32IfLE(sizeHtmp);
        
        rfbFilenameTranslate2UNIX(cl, buffer, filename1);

        /* If the file exists... We can send a rfbFileChecksums back to the client before we send an rfbFileAcceptHeader */
        /* TODO: Delta Transfer */

        cl->fileTransfer.fd=open(filename1, O_CREAT|O_WRONLY|O_TRUNC, 0744);
        if (DB) rfbLog("rfbProcessFileTransfer() rfbFileTransferOffer(\"%s\"->\"%s\") %s %s fd=%d\n", buffer, filename1, (cl->fileTransfer.fd==-1?"Failed":"Success"), (cl->fileTransfer.fd==-1?strerror(errno):""), cl->fileTransfer.fd);
        /*
        */
        
        /* File Size in bytes, 0xFFFFFFFF (-1) means error */
        retval = rfbSendFileTransferMessage(cl, rfbFileAcceptHeader, 0, (cl->fileTransfer.fd==-1 ? -1 : 0), length, buffer);
        if (cl->fileTransfer.fd==-1) {
            free(buffer);
            return retval;
        }
        
        /* setup filetransfer stuff */
        cl->fileTransfer.fileSize = size;
        cl->fileTransfer.numPackets = size / sz_rfbBlockSize;
        cl->fileTransfer.receiving = 1;
        cl->fileTransfer.sending = 0;
        break;

    case rfbFilePacket:
        /*
        rfbLog("rfbProcessFileTransfer() rfbFilePacket:\n");
        */
        if ((buffer = rfbProcessFileTransferReadBuffer(cl, length))==NULL) return FALSE;
        if (cl->fileTransfer.fd!=-1) {
            /* buffer contains the contents of the file */
            if (size==0)
                retval=write(cl->fileTransfer.fd, buffer, length);
            else
            {
#ifdef LIBVNCSERVER_HAVE_LIBZ
                /* compressed packet */
                nRet = uncompress(compBuff,&nRawBytes,(const unsigned char*)buffer, length);
                retval=write(cl->fileTransfer.fd, compBuff, nRawBytes);
#else
                /* Write the file out as received... */
                retval=write(cl->fileTransfer.fd, buffer, length);
#endif
            }
            if (retval==-1)
            {
                close(cl->fileTransfer.fd);
                cl->fileTransfer.fd=-1;
                cl->fileTransfer.sending   = 0;
                cl->fileTransfer.receiving = 0;
            }
        }
        break;

    case rfbEndOfFile:
        if (DB) rfbLog("rfbProcessFileTransfer() rfbEndOfFile\n");
        /*
        */
        if (cl->fileTransfer.fd!=-1)
            close(cl->fileTransfer.fd);
        cl->fileTransfer.fd=-1;
        cl->fileTransfer.sending   = 0;
        cl->fileTransfer.receiving = 0;
        break;

    case rfbAbortFileTransfer:
        if (DB) rfbLog("rfbProcessFileTransfer() rfbAbortFileTransfer\n");
        /*
        */
        if (cl->fileTransfer.fd!=-1)
        {
            close(cl->fileTransfer.fd);
            cl->fileTransfer.fd=-1;
            cl->fileTransfer.sending   = 0;
            cl->fileTransfer.receiving = 0;
        }
        else
        {
            /* We use this message for FileTransfer rights (<=RC18 versions)
             * The client asks for FileTransfer permission
             */
            if (contentParam == 0)
            {
                rfbLog("rfbProcessFileTransfer() File Transfer Permission DENIED! (Client Version <=RC18)\n");
                /* Old method for FileTransfer handshake perimssion (<=RC18) (Deny it)*/
                return rfbSendFileTransferMessage(cl, rfbAbortFileTransfer, 0, -1, 0, "");
            }
            /* New method is allowed */
            if (cl->screen->getFileTransferPermission!=NULL)
            {
                if (cl->screen->getFileTransferPermission(cl)==TRUE)
                {
                    rfbLog("rfbProcessFileTransfer() File Transfer Permission Granted!\n");
                    return rfbSendFileTransferMessage(cl, rfbFileTransferAccess, 0, 1 , 0, ""); /* Permit */
                }
                else
                {
                    rfbLog("rfbProcessFileTransfer() File Transfer Permission DENIED!\n");
                    return rfbSendFileTransferMessage(cl, rfbFileTransferAccess, 0, -1 , 0, ""); /* Deny */
                }
            }
            else
            {
                if (cl->screen->permitFileTransfer)
                {
                    rfbLog("rfbProcessFileTransfer() File Transfer Permission Granted!\n");
                    return rfbSendFileTransferMessage(cl, rfbFileTransferAccess, 0, 1 , 0, ""); /* Permit */
                }
                else
                {
                    rfbLog("rfbProcessFileTransfer() File Transfer Permission DENIED by default!\n");
                    return rfbSendFileTransferMessage(cl, rfbFileTransferAccess, 0, -1 , 0, ""); /* DEFAULT: DENY (for security) */
                }
                
            }
        }
        break;


    case rfbCommand:
        /*
        rfbLog("rfbProcessFileTransfer() rfbCommand:\n");
        */
        if ((buffer = rfbProcessFileTransferReadBuffer(cl, length))==NULL) return FALSE;
        switch (contentParam) {
        case rfbCDirCreate:  /* Client requests the creation of a directory */
            rfbFilenameTranslate2UNIX(cl, buffer, filename1);
            retval = mkdir(filename1, 0755);
            if (DB) rfbLog("rfbProcessFileTransfer() rfbCommand: rfbCDirCreate(\"%s\"->\"%s\") %s\n", buffer, filename1, (retval==-1?"Failed":"Success"));
            /*
            */
            retval = rfbSendFileTransferMessage(cl, rfbCommandReturn, rfbADirCreate, retval, length, buffer);
            if (buffer!=NULL) free(buffer);
            return retval;
        case rfbCFileDelete: /* Client requests the deletion of a file */
            rfbFilenameTranslate2UNIX(cl, buffer, filename1);
            if (stat(filename1,&statbuf)==0)
            {
                if (S_ISDIR(statbuf.st_mode))
                    retval = rmdir(filename1);
                else
                    retval = unlink(filename1);
            }
            else retval=-1;
            retval = rfbSendFileTransferMessage(cl, rfbCommandReturn, rfbAFileDelete, retval, length, buffer);
            if (buffer!=NULL) free(buffer);
            return retval;
        case rfbCFileRename: /* Client requests the Renaming of a file/directory */
            p = strrchr(buffer, '*');
            if (p != NULL)
            {
                /* Split into 2 filenames ('*' is a seperator) */
                *p = '\0';
                rfbFilenameTranslate2UNIX(cl, buffer, filename1);
                rfbFilenameTranslate2UNIX(cl, p+1,    filename2);
                retval = rename(filename1,filename2);
                if (DB) rfbLog("rfbProcessFileTransfer() rfbCommand: rfbCFileRename(\"%s\"->\"%s\" -->> \"%s\"->\"%s\") %s\n", buffer, filename1, p+1, filename2, (retval==-1?"Failed":"Success"));
                /*
                */
                /* Restore the buffer so the reply is good */
                *p = '*';
                retval = rfbSendFileTransferMessage(cl, rfbCommandReturn, rfbAFileRename, retval, length, buffer);
                if (buffer!=NULL) free(buffer);
                return retval;
            }
            break;
        }
    
        break;
    }

    /* NOTE: don't forget to free(buffer) if you return early! */
    if (buffer!=NULL) free(buffer);
    return TRUE;
}

/*
 * rfbProcessClientNormalMessage is called when the client has sent a normal
 * protocol message.
 */

static void
rfbProcessClientNormalMessage(rfbClientPtr cl)
{
    int n=0;
    rfbClientToServerMsg msg;
    char *str;
    int i;
    uint32_t enc=0;
    uint32_t lastPreferredEncoding = -1;
    char encBuf[64];
    char encBuf2[64];

    if ((n = rfbReadExact(cl, (char *)&msg, 1)) <= 0) {
        if (n != 0)
            rfbLogPerror("rfbProcessClientNormalMessage: read");
        rfbCloseClient(cl);
        return;
    }

    switch (msg.type) {

    case rfbSetPixelFormat:

        if ((n = rfbReadExact(cl, ((char *)&msg) + 1,
                           sz_rfbSetPixelFormatMsg - 1)) <= 0) {
            if (n != 0)
                rfbLogPerror("rfbProcessClientNormalMessage: read");
            rfbCloseClient(cl);
            return;
        }

        cl->format.bitsPerPixel = msg.spf.format.bitsPerPixel;
        cl->format.depth = msg.spf.format.depth;
        cl->format.bigEndian = (msg.spf.format.bigEndian ? TRUE : FALSE);
        cl->format.trueColour = (msg.spf.format.trueColour ? TRUE : FALSE);
        cl->format.redMax = Swap16IfLE(msg.spf.format.redMax);
        cl->format.greenMax = Swap16IfLE(msg.spf.format.greenMax);
        cl->format.blueMax = Swap16IfLE(msg.spf.format.blueMax);
        cl->format.redShift = msg.spf.format.redShift;
        cl->format.greenShift = msg.spf.format.greenShift;
        cl->format.blueShift = msg.spf.format.blueShift;

	cl->readyForSetColourMapEntries = TRUE;
        cl->screen->setTranslateFunction(cl);

        rfbStatRecordMessageRcvd(cl, msg.type, sz_rfbSetPixelFormatMsg, sz_rfbSetPixelFormatMsg);

        return;


    case rfbFixColourMapEntries:
        if ((n = rfbReadExact(cl, ((char *)&msg) + 1,
                           sz_rfbFixColourMapEntriesMsg - 1)) <= 0) {
            if (n != 0)
                rfbLogPerror("rfbProcessClientNormalMessage: read");
            rfbCloseClient(cl);
            return;
        }
        rfbStatRecordMessageRcvd(cl, msg.type, sz_rfbSetPixelFormatMsg, sz_rfbSetPixelFormatMsg);
        rfbLog("rfbProcessClientNormalMessage: %s",
                "FixColourMapEntries unsupported\n");
        rfbCloseClient(cl);
        return;


    /* NOTE: Some clients send us a set of encodings (ie: PointerPos) designed to enable/disable features...
     * We may want to look into this...
     * Example:
     *     case rfbEncodingXCursor:
     *         cl->enableCursorShapeUpdates = TRUE;
     *
     * Currently: cl->enableCursorShapeUpdates can *never* be turned off...
     */
    case rfbSetEncodings:
    {

        if ((n = rfbReadExact(cl, ((char *)&msg) + 1,
                           sz_rfbSetEncodingsMsg - 1)) <= 0) {
            if (n != 0)
                rfbLogPerror("rfbProcessClientNormalMessage: read");
            rfbCloseClient(cl);
            return;
        }

        msg.se.nEncodings = Swap16IfLE(msg.se.nEncodings);

        rfbStatRecordMessageRcvd(cl, msg.type, sz_rfbSetEncodingsMsg+(msg.se.nEncodings*4),sz_rfbSetEncodingsMsg+(msg.se.nEncodings*4));

        /*
         * UltraVNC Client has the ability to adapt to changing network environments
         * So, let's give it a change to tell us what it wants now!
         */
        if (cl->preferredEncoding!=-1)
            lastPreferredEncoding = cl->preferredEncoding;

        /* Reset all flags to defaults (allows us to switch between PointerPos and Server Drawn Cursors) */
        cl->preferredEncoding=-1;
        cl->useCopyRect              = FALSE;
        cl->useNewFBSize             = FALSE;
        cl->cursorWasChanged         = FALSE;
        cl->useRichCursorEncoding    = FALSE;
        cl->enableCursorPosUpdates   = FALSE;
        cl->enableCursorShapeUpdates = FALSE;
        cl->enableCursorShapeUpdates = FALSE;
        cl->enableLastRectEncoding   = FALSE;
        cl->enableKeyboardLedState   = FALSE;
        cl->enableSupportedMessages  = FALSE;
        cl->enableSupportedEncodings = FALSE;
        cl->enableServerIdentity     = FALSE;


        for (i = 0; i < msg.se.nEncodings; i++) {
            if ((n = rfbReadExact(cl, (char *)&enc, 4)) <= 0) {
                if (n != 0)
                    rfbLogPerror("rfbProcessClientNormalMessage: read");
                rfbCloseClient(cl);
                return;
            }
            enc = Swap32IfLE(enc);

            switch (enc) {

            case rfbEncodingCopyRect:
		cl->useCopyRect = TRUE;
                break;
            case rfbEncodingRaw:
            case rfbEncodingRRE:
            case rfbEncodingCoRRE:
            case rfbEncodingHextile:
            case rfbEncodingUltra:
#ifdef LIBVNCSERVER_HAVE_LIBZ
	    case rfbEncodingZlib:
            case rfbEncodingZRLE:
#ifdef LIBVNCSERVER_HAVE_LIBJPEG
	    case rfbEncodingTight:
#endif
#endif
            /* The first supported encoding is the 'preferred' encoding */
                if (cl->preferredEncoding == -1)
                    cl->preferredEncoding = enc;


                break;
	    case rfbEncodingXCursor:
		if(!cl->screen->dontConvertRichCursorToXCursor) {
		    rfbLog("Enabling X-style cursor updates for client %s\n",
			   cl->host);
		    /* if cursor was drawn, hide the cursor */
		    if(!cl->enableCursorShapeUpdates)
		        rfbRedrawAfterHideCursor(cl,NULL);

		    cl->enableCursorShapeUpdates = TRUE;
		    cl->cursorWasChanged = TRUE;
		}
		break;
	    case rfbEncodingRichCursor:
	        rfbLog("Enabling full-color cursor updates for client %s\n",
		       cl->host);
		/* if cursor was drawn, hide the cursor */
		if(!cl->enableCursorShapeUpdates)
		    rfbRedrawAfterHideCursor(cl,NULL);

	        cl->enableCursorShapeUpdates = TRUE;
	        cl->useRichCursorEncoding = TRUE;
	        cl->cursorWasChanged = TRUE;
	        break;
	    case rfbEncodingPointerPos:
		if (!cl->enableCursorPosUpdates) {
		    rfbLog("Enabling cursor position updates for client %s\n",
			   cl->host);
		    cl->enableCursorPosUpdates = TRUE;
		    cl->cursorWasMoved = TRUE;
		}
	        break;
	    case rfbEncodingLastRect:
		if (!cl->enableLastRectEncoding) {
		    rfbLog("Enabling LastRect protocol extension for client "
			   "%s\n", cl->host);
		    cl->enableLastRectEncoding = TRUE;
		}
		break;
	    case rfbEncodingNewFBSize:
		if (!cl->useNewFBSize) {
		    rfbLog("Enabling NewFBSize protocol extension for client "
			   "%s\n", cl->host);
		    cl->useNewFBSize = TRUE;
		}
		break;
            case rfbEncodingKeyboardLedState:
                if (!cl->enableKeyboardLedState) {
                  rfbLog("Enabling KeyboardLedState protocol extension for client "
                          "%s\n", cl->host);
                  cl->enableKeyboardLedState = TRUE;
                }
                break;           
            case rfbEncodingSupportedMessages:
                if (!cl->enableSupportedMessages) {
                  rfbLog("Enabling SupportedMessages protocol extension for client "
                          "%s\n", cl->host);
                  cl->enableSupportedMessages = TRUE;
                }
                break;           
            case rfbEncodingSupportedEncodings:
                if (!cl->enableSupportedEncodings) {
                  rfbLog("Enabling SupportedEncodings protocol extension for client "
                          "%s\n", cl->host);
                  cl->enableSupportedEncodings = TRUE;
                }
                break;           
            case rfbEncodingServerIdentity:
                if (!cl->enableServerIdentity) {
                  rfbLog("Enabling ServerIdentity protocol extension for client "
                          "%s\n", cl->host);
                  cl->enableServerIdentity = TRUE;
                }
                break;           
            default:
#ifdef LIBVNCSERVER_HAVE_LIBZ
		if ( enc >= (uint32_t)rfbEncodingCompressLevel0 &&
		     enc <= (uint32_t)rfbEncodingCompressLevel9 ) {
		    cl->zlibCompressLevel = enc & 0x0F;
#ifdef LIBVNCSERVER_HAVE_LIBJPEG
		    cl->tightCompressLevel = enc & 0x0F;
		    rfbLog("Using compression level %d for client %s\n",
			   cl->tightCompressLevel, cl->host);
		} else if ( enc >= (uint32_t)rfbEncodingQualityLevel0 &&
			    enc <= (uint32_t)rfbEncodingQualityLevel9 ) {
		    cl->tightQualityLevel = enc & 0x0F;
		    rfbLog("Using image quality level %d for client %s\n",
			   cl->tightQualityLevel, cl->host);
#endif
		} else
#endif
		{
			rfbExtensionData* e;
			for(e = cl->extensions; e;) {
				rfbExtensionData* next = e->next;
				if(e->extension->enablePseudoEncoding &&
					e->extension->enablePseudoEncoding(cl,
						&e->data, (int)enc))
					/* ext handles this encoding */
					break;
				e = next;
			}
			if(e == NULL) {
				rfbBool handled = FALSE;
				/* if the pseudo encoding is not handled by the
				   enabled extensions, search through all
				   extensions. */
				rfbProtocolExtension* e;

				for(e = rfbGetExtensionIterator(); e;) {
					int* encs = e->pseudoEncodings;
					while(encs && *encs!=0) {
						if(*encs==(int)enc) {
							void* data = NULL;
							if(!e->enablePseudoEncoding(cl, &data, (int)enc)) {
								rfbLog("Installed extension pretends to handle pseudo encoding 0x%x, but does not!\n",(int)enc);
							} else {
								rfbEnableExtension(cl, e, data);
								handled = TRUE;
								e = NULL;
								break;
							}
						}
						encs++;
					}

					if(e)
						e = e->next;
				}
				rfbReleaseExtensionIterator();

				if(!handled)
					rfbLog("rfbProcessClientNormalMessage: "
					    "ignoring unsupported encoding type %s\n",
					    encodingName(enc,encBuf,sizeof(encBuf)));
			}
		}
            }
        }



        if (cl->preferredEncoding == -1) {
            if (lastPreferredEncoding==-1) {
                cl->preferredEncoding = rfbEncodingRaw;
                rfbLog("Defaulting to %s encoding for client %s\n", encodingName(cl->preferredEncoding,encBuf,sizeof(encBuf)),cl->host);
            }
            else {
                cl->preferredEncoding = lastPreferredEncoding;
                rfbLog("Sticking with %s encoding for client %s\n", encodingName(cl->preferredEncoding,encBuf,sizeof(encBuf)),cl->host);
            }
        }
        else
        {
          if (lastPreferredEncoding==-1) {
              rfbLog("Using %s encoding for client %s\n", encodingName(cl->preferredEncoding,encBuf,sizeof(encBuf)),cl->host);
          } else {
              rfbLog("Switching from %s to %s Encoding for client %s\n", 
                  encodingName(lastPreferredEncoding,encBuf2,sizeof(encBuf2)),
                  encodingName(cl->preferredEncoding,encBuf,sizeof(encBuf)), cl->host);
          }
        }
        
	if (cl->enableCursorPosUpdates && !cl->enableCursorShapeUpdates) {
	  rfbLog("Disabling cursor position updates for client %s\n",
		 cl->host);
	  cl->enableCursorPosUpdates = FALSE;
	}

        return;
    }


    case rfbFramebufferUpdat