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libtdevnc/rfbserver.c

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/*
* rfbserver.c - deal with server-side of the RFB protocol.
*/
/*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "rfb.h"
#include "sraRegion.h"
#ifdef WIN32
#define write(sock,buf,len) send(sock,buf,len,0)
#else
#include <unistd.h>
#include <pwd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#endif
#include <sys/types.h>
#ifdef CORBA
#include <vncserverctrl.h>
#endif
#ifdef DEBUGPROTO
#undef DEBUGPROTO
#define DEBUGPROTO(x) x
#else
#define DEBUGPROTO(x)
#endif
rfbClientPtr pointerClient = NULL; /* Mutex for pointer events */
static void rfbProcessClientProtocolVersion(rfbClientPtr cl);
static void rfbProcessClientNormalMessage(rfbClientPtr cl);
static void rfbProcessClientInitMessage(rfbClientPtr cl);
#ifdef HAVE_PTHREADS
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 HAVE_PTHREADS
MUTEX(rfbClientListMutex);
#endif
struct rfbClientIterator {
rfbClientPtr next;
rfbScreenInfoPtr screen;
};
void
rfbClientListInit(rfbScreenInfoPtr rfbScreen)
{
if(sizeof(Bool)!=1) {
/* a sanity check */
fprintf(stderr,"Bool's size is not 1 (%d)!\n",sizeof(Bool));
exit(1);
}
rfbScreen->rfbClientHead = NULL;
INIT_MUTEX(rfbClientListMutex);
}
rfbClientIteratorPtr
rfbGetClientIterator(rfbScreenInfoPtr rfbScreen)
{
rfbClientIteratorPtr i =
(rfbClientIteratorPtr)malloc(sizeof(struct rfbClientIterator));
i->next = 0;
i->screen = rfbScreen;
return i;
}
rfbClientPtr
rfbClientIteratorNext(rfbClientIteratorPtr i)
{
if(i->next == 0) {
LOCK(rfbClientListMutex);
i->next = i->screen->rfbClientHead;
UNLOCK(rfbClientListMutex);
} else {
IF_PTHREADS(rfbClientPtr cl = i->next);
i->next = i->next->next;
IF_PTHREADS(rfbDecrClientRef(cl));
}
#ifdef HAVE_PTHREADS
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(rfbScreen,sock)
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(rfbScreen,host, port)
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;
}
/*
* rfbNewClient is called when a new connection has been made by whatever
* means.
*/
rfbClientPtr
rfbNewTCPOrUDPClient(rfbScreen,sock,isUDP)
rfbScreenInfoPtr rfbScreen;
int sock;
Bool isUDP;
{
rfbProtocolVersionMsg pv;
rfbClientIteratorPtr iterator;
rfbClientPtr cl,cl_;
struct sockaddr_in addr;
socklen_t addrlen = sizeof(struct sockaddr_in);
int i;
cl = (rfbClientPtr)calloc(sizeof(rfbClientRec),1);
cl->screen = rfbScreen;
cl->sock = sock;
rfbResetStats(cl);
if(isUDP) {
rfbLog(" accepted UDP client\n");
} else {
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);
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 = rfbEncodingRaw;
cl->correMaxWidth = 48;
cl->correMaxHeight = 48;
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->rfbServerFormat;
cl->translateFn = rfbTranslateNone;
cl->translateLookupTable = NULL;
LOCK(rfbClientListMutex);
IF_PTHREADS(cl->refCount = 0);
cl->next = rfbScreen->rfbClientHead;
cl->prev = NULL;
if (rfbScreen->rfbClientHead)
rfbScreen->rfbClientHead->prev = cl;
rfbScreen->rfbClientHead = cl;
UNLOCK(rfbClientListMutex);
cl->tightCompressLevel = TIGHT_DEFAULT_COMPRESSION;
cl->tightQualityLevel = -1;
for (i = 0; i < 4; i++)
cl->zsActive[i] = FALSE;
cl->enableCursorShapeUpdates = FALSE;
cl->useRichCursorEncoding = FALSE;
cl->enableLastRectEncoding = FALSE;
cl->useNewFBSize = FALSE;
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;
sprintf(pv,rfbProtocolVersionFormat,rfbProtocolMajorVersion,
rfbProtocolMinorVersion);
if (WriteExact(cl, pv, sz_rfbProtocolVersionMsg) < 0) {
rfbLogPerror("rfbNewClient: write");
rfbCloseClient(cl);
/* TODO: memory leak here (cl is never freed)
* can rfbClientConnectionGone called at this time?
* tim@tjansen.de
*/
return NULL;
}
}
cl->clientData = NULL;
cl->clientGoneHook = doNothingWithClient;
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(rfbScreen,sock)
rfbScreenInfoPtr rfbScreen;
int sock;
{
return(rfbNewTCPOrUDPClient(rfbScreen,sock,FALSE));
}
rfbClientPtr
rfbNewUDPClient(rfbScreen)
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(cl)
rfbClientPtr cl;
{
int i;
LOCK(rfbClientListMutex);
if (cl->prev)
cl->prev->next = cl->next;
else
cl->screen->rfbClientHead = cl->next;
if (cl->next)
cl->next->prev = cl->prev;
#ifdef HAVE_PTHREADS
LOCK(cl->refCountMutex);
if(cl->refCount) {
UNLOCK(cl->refCountMutex);
WAIT(cl->deleteCond,cl->refCountMutex);
} else {
UNLOCK(cl->refCountMutex);
}
#endif
if(cl->sock>=0)
FD_CLR(cl->sock,&(cl->screen->allFds));
cl->clientGoneHook(cl);
rfbLog("Client %s gone\n",cl->host);
free(cl->host);
/* Release the compression state structures if any. */
if ( cl->compStreamInited ) {
deflateEnd( &(cl->compStream) );
}
for (i = 0; i < 4; i++) {
if (cl->zsActive[i])
deflateEnd(&cl->zsStruct[i]);
}
if (pointerClient == cl)
pointerClient = NULL;
sraRgnDestroy(cl->modifiedRegion);
sraRgnDestroy(cl->requestedRegion);
sraRgnDestroy(cl->copyRegion);
UNLOCK(rfbClientListMutex);
if (cl->translateLookupTable) free(cl->translateLookupTable);
TINI_COND(cl->updateCond);
TINI_MUTEX(cl->updateMutex);
LOCK(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(cl)
rfbClientPtr cl;
{
switch (cl->state) {
case RFB_PROTOCOL_VERSION:
rfbProcessClientProtocolVersion(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(cl)
rfbClientPtr cl;
{
rfbProtocolVersionMsg pv;
int n, major_, minor_;
char failureReason[256];
if ((n = ReadExact(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 %1024s\n",&major_,&minor_,name) != 3) {
rfbLog("rfbProcessClientProtocolVersion: not a valid RFB client\n");
rfbCloseClient(cl);
return;
}
free(cl->host);
cl->host=strdup(name);
}
rfbLog("Protocol version %d.%d\n", major_, minor_);
if (major_ != rfbProtocolMajorVersion) {
/* Major version mismatch - send a ConnFailed message */
rfbLog("Major version mismatch\n");
sprintf(failureReason,
"RFB protocol version mismatch - server %d.%d, client %d.%d",
rfbProtocolMajorVersion,rfbProtocolMinorVersion,major_,minor_);
rfbClientConnFailed(cl, failureReason);
return;
}
if (minor_ != rfbProtocolMinorVersion) {
/* Minor version mismatch - warn but try to continue */
rfbLog("Ignoring minor version mismatch\n");
}
rfbAuthNewClient(cl);
}
/*
* rfbClientConnFailed is called when a client connection has failed either
* because it talks the wrong protocol or it has failed authentication.
*/
void
rfbClientConnFailed(cl, reason)
rfbClientPtr cl;
char *reason;
{
char *buf;
int len = strlen(reason);
buf = (char *)malloc(8 + len);
((CARD32 *)buf)[0] = Swap32IfLE(rfbConnFailed);
((CARD32 *)buf)[1] = Swap32IfLE(len);
memcpy(buf + 8, reason, len);
if (WriteExact(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(cl)
rfbClientPtr cl;
{
rfbClientInitMsg ci;
char buf[256];
rfbServerInitMsg *si = (rfbServerInitMsg *)buf;
int len, n;
rfbClientIteratorPtr iterator;
rfbClientPtr otherCl;
if ((n = ReadExact(cl, (char *)&ci,sz_rfbClientInitMsg)) <= 0) {
if (n == 0)
rfbLog("rfbProcessClientInitMessage: client gone\n");
else
rfbLogPerror("rfbProcessClientInitMessage: read");
rfbCloseClient(cl);
return;
}
si->framebufferWidth = Swap16IfLE(cl->screen->width);
si->framebufferHeight = Swap16IfLE(cl->screen->height);
si->format = cl->screen->rfbServerFormat;
si->format.redMax = Swap16IfLE(si->format.redMax);
si->format.greenMax = Swap16IfLE(si->format.greenMax);
si->format.blueMax = Swap16IfLE(si->format.blueMax);
if (strlen(cl->screen->desktopName) > 128) /* sanity check on desktop name len */
((char*)cl->screen->desktopName)[128] = 0;
strcpy(buf + sz_rfbServerInitMsg, cl->screen->desktopName);
len = strlen(buf + sz_rfbServerInitMsg);
si->nameLength = Swap32IfLE(len);
if (WriteExact(cl, buf, sz_rfbServerInitMsg + len) < 0) {
rfbLogPerror("rfbProcessClientInitMessage: write");
rfbCloseClient(cl);
return;
}
cl->state = RFB_NORMAL;
if (!cl->reverseConnection &&
(cl->screen->rfbNeverShared || (!cl->screen->rfbAlwaysShared && !ci.shared))) {
if (cl->screen->rfbDontDisconnect) {
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);
}
}
}
/*
* rfbProcessClientNormalMessage is called when the client has sent a normal
* protocol message.
*/
static void
rfbProcessClientNormalMessage(cl)
rfbClientPtr cl;
{
int n=0;
rfbClientToServerMsg msg;
char *str;
if ((n = ReadExact(cl, (char *)&msg, 1)) <= 0) {
if (n != 0)
rfbLogPerror("rfbProcessClientNormalMessage: read");
rfbCloseClient(cl);
return;
}
switch (msg.type) {
case rfbSetPixelFormat:
if ((n = ReadExact(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);
return;
case rfbFixColourMapEntries:
if ((n = ReadExact(cl, ((char *)&msg) + 1,
sz_rfbFixColourMapEntriesMsg - 1)) <= 0) {
if (n != 0)
rfbLogPerror("rfbProcessClientNormalMessage: read");
rfbCloseClient(cl);
return;
}
rfbLog("rfbProcessClientNormalMessage: %s",
"FixColourMapEntries unsupported\n");
rfbCloseClient(cl);
return;
case rfbSetEncodings:
{
int i;
CARD32 enc;
if ((n = ReadExact(cl, ((char *)&msg) + 1,
sz_rfbSetEncodingsMsg - 1)) <= 0) {
if (n != 0)
rfbLogPerror("rfbProcessClientNormalMessage: read");
rfbCloseClient(cl);
return;
}
msg.se.nEncodings = Swap16IfLE(msg.se.nEncodings);
cl->preferredEncoding = -1;
cl->useCopyRect = FALSE;
cl->enableCursorShapeUpdates = FALSE;
cl->enableLastRectEncoding = FALSE;
cl->useNewFBSize = FALSE;
for (i = 0; i < msg.se.nEncodings; i++) {
if ((n = ReadExact(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:
if (cl->preferredEncoding == -1) {
cl->preferredEncoding = enc;
rfbLog("Using raw encoding for client %s\n",
cl->host);
}
break;
case rfbEncodingRRE:
if (cl->preferredEncoding == -1) {
cl->preferredEncoding = enc;
rfbLog("Using rre encoding for client %s\n",
cl->host);
}
break;
case rfbEncodingCoRRE:
if (cl->preferredEncoding == -1) {
cl->preferredEncoding = enc;
rfbLog("Using CoRRE encoding for client %s\n",
cl->host);
}
break;
case rfbEncodingHextile:
if (cl->preferredEncoding == -1) {
cl->preferredEncoding = enc;
rfbLog("Using hextile encoding for client %s\n",
cl->host);
}
break;
case rfbEncodingZlib:
if (cl->preferredEncoding == -1) {
cl->preferredEncoding = enc;
rfbLog("Using zlib encoding for client %s\n",
cl->host);
}
break;
case rfbEncodingTight:
if (cl->preferredEncoding == -1) {
cl->preferredEncoding = enc;
rfbLog("Using tight encoding for client %s\n",
cl->host);
}
break;
case rfbEncodingXCursor:
if(!cl->screen->dontConvertRichCursorToXCursor) {
rfbLog("Enabling X-style cursor updates for client %s\n",
cl->host);
cl->enableCursorShapeUpdates = TRUE;
cl->cursorWasChanged = TRUE;
}
break;
case rfbEncodingRichCursor:
rfbLog("Enabling full-color cursor updates for client "
"%s\n", cl->host);
cl->enableCursorShapeUpdates = TRUE;
cl->useRichCursorEncoding = TRUE;
cl->cursorWasChanged = 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;
#ifdef BACKCHANNEL
case rfbEncodingBackChannel:
if (!cl->enableBackChannel) {
rfbLog("Enabling BackChannel protocol extension for "
"client %s\n", cl->host);
cl->enableBackChannel = TRUE;
}
break;
#endif
default:
if ( enc >= (CARD32)rfbEncodingCompressLevel0 &&
enc <= (CARD32)rfbEncodingCompressLevel9 ) {
cl->zlibCompressLevel = enc & 0x0F;
cl->tightCompressLevel = enc & 0x0F;
rfbLog("Using compression level %d for client %s\n",
cl->tightCompressLevel, cl->host);
} else if ( enc >= (CARD32)rfbEncodingQualityLevel0 &&
enc <= (CARD32)rfbEncodingQualityLevel9 ) {
cl->tightQualityLevel = enc & 0x0F;
rfbLog("Using image quality level %d for client %s\n",
cl->tightQualityLevel, cl->host);
} else
rfbLog("rfbProcessClientNormalMessage: ignoring unknown "
"encoding type %d\n", (int)enc);
}
}
if (cl->preferredEncoding == -1) {
cl->preferredEncoding = rfbEncodingRaw;
}
return;
}
case rfbFramebufferUpdateRequest:
{
sraRegionPtr tmpRegion;
if ((n = ReadExact(cl, ((char *)&msg) + 1,
sz_rfbFramebufferUpdateRequestMsg-1)) <= 0) {
if (n != 0)
rfbLogPerror("rfbProcessClientNormalMessage: read");
rfbCloseClient(cl);
return;
}
tmpRegion =
sraRgnCreateRect(Swap16IfLE(msg.fur.x),
Swap16IfLE(msg.fur.y),
Swap16IfLE(msg.fur.x)+Swap16IfLE(msg.fur.w),
Swap16IfLE(msg.fur.y)+Swap16IfLE(msg.fur.h));
LOCK(cl->updateMutex);
sraRgnOr(cl->requestedRegion,tmpRegion);
if (!cl->readyForSetColourMapEntries) {
/* client hasn't sent a SetPixelFormat so is using server's */
cl->readyForSetColourMapEntries = TRUE;
if (!cl->format.trueColour) {
if (!rfbSetClientColourMap(cl, 0, 0)) {
sraRgnDestroy(tmpRegion);
UNLOCK(cl->updateMutex);
return;
}
}
}
if (!msg.fur.incremental) {
sraRgnOr(cl->modifiedRegion,tmpRegion);
sraRgnSubtract(cl->copyRegion,tmpRegion);
}
TSIGNAL(cl->updateCond);
UNLOCK(cl->updateMutex);
sraRgnDestroy(tmpRegion);
return;
}
case rfbKeyEvent:
cl->rfbKeyEventsRcvd++;
if ((n = ReadExact(cl, ((char *)&msg) + 1,
sz_rfbKeyEventMsg - 1)) <= 0) {
if (n != 0)
rfbLogPerror("rfbProcessClientNormalMessage: read");
rfbCloseClient(cl);
return;
}
cl->screen->kbdAddEvent(msg.ke.down, (KeySym)Swap32IfLE(msg.ke.key), cl);
return;
case rfbPointerEvent:
cl->rfbPointerEventsRcvd++;
if ((n = ReadExact(cl, ((char *)&msg) + 1,
sz_rfbPointerEventMsg - 1)) <= 0) {
if (n != 0)
rfbLogPerror("rfbProcessClientNormalMessage: read");
rfbCloseClient(cl);
return;
}
if (pointerClient && (pointerClient != cl))
return;
if (msg.pe.buttonMask == 0)
pointerClient = NULL;
else
pointerClient = cl;
cl->screen->ptrAddEvent(msg.pe.buttonMask,
Swap16IfLE(msg.pe.x), Swap16IfLE(msg.pe.y), cl);
return;
case rfbClientCutText:
if ((n = ReadExact(cl, ((char *)&msg) + 1,
sz_rfbClientCutTextMsg - 1)) <= 0) {
if (n != 0)
rfbLogPerror("rfbProcessClientNormalMessage: read");
rfbCloseClient(cl);
return;
}
msg.cct.length = Swap32IfLE(msg.cct.length);
str = (char *)malloc(msg.cct.length);
if ((n = ReadExact(cl, str, msg.cct.length)) <= 0) {
if (n != 0)
rfbLogPerror("rfbProcessClientNormalMessage: read");
free(str);
rfbCloseClient(cl);
return;
}
cl->screen->setXCutText(str, msg.cct.length, cl);
free(str);
return;
default:
rfbLog("rfbProcessClientNormalMessage: unknown message type %d\n",
msg.type);
rfbLog(" ... closing connection\n");
rfbCloseClient(cl);
return;
}
}
/*
* rfbSendFramebufferUpdate - send the currently pending framebuffer update to
* the RFB client.
* givenUpdateRegion is not changed.
*/
Bool
rfbSendFramebufferUpdate(cl, givenUpdateRegion)
rfbClientPtr cl;
sraRegionPtr givenUpdateRegion;
{
sraRectangleIterator* i;
sraRect rect;
int nUpdateRegionRects;
rfbFramebufferUpdateMsg *fu = (rfbFramebufferUpdateMsg *)cl->updateBuf;
sraRegionPtr updateRegion,updateCopyRegion,tmpRegion;
int dx, dy;
Bool sendCursorShape = FALSE;
if(cl->screen->displayHook)
cl->screen->displayHook(cl);
/*
* If framebuffer size was changed and the client supports NewFBSize
* encoding, just send NewFBSize marker and return.
*/
if (cl->useNewFBSize && cl->newFBSizePending) {
LOCK(cl->updateMutex);
cl->newFBSizePending = FALSE;
UNLOCK(cl->updateMutex);
cl->rfbFramebufferUpdateMessagesSent++;
fu->type = rfbFramebufferUpdate;
fu->nRects = Swap16IfLE(1);
cl->ublen = sz_rfbFramebufferUpdateMsg;
if (!rfbSendNewFBSize(cl, cl->screen->width, cl->screen->height)) {
return FALSE;
}
return rfbSendUpdateBuf(cl);
}
/*
* If this client understands cursor shape updates, cursor should be
* removed from the framebuffer. Otherwise, make sure it's put up.
*/
if (cl->enableCursorShapeUpdates) {
if (cl->screen->cursorIsDrawn) {
rfbUndrawCursor(cl->screen);
}
if (!cl->screen->cursorIsDrawn && cl->cursorWasChanged &&
cl->readyForSetColourMapEntries)
sendCursorShape = TRUE;
} else {
if (!cl->screen->cursorIsDrawn) {
rfbDrawCursor(cl->screen);
}
}
LOCK(cl->updateMutex);
/*
* The modifiedRegion may overlap the destination copyRegion. We remove
* any overlapping bits from the copyRegion (since they'd only be
* overwritten anyway).
*/
sraRgnSubtract(cl->copyRegion,cl->modifiedRegion);
/*
* The client is interested in the region requestedRegion. The region
* which should be updated now is the intersection of requestedRegion
* and the union of modifiedRegion and copyRegion. If it's empty then
* no update is needed.
*/
updateRegion = sraRgnCreateRgn(givenUpdateRegion);
sraRgnOr(updateRegion,cl->copyRegion);
if(!sraRgnAnd(updateRegion,cl->requestedRegion) && !sendCursorShape) {
sraRgnDestroy(updateRegion);
UNLOCK(cl->updateMutex);
return TRUE;
}
/*
* We assume that the client doesn't have any pixel data outside the
* requestedRegion. In other words, both the source and destination of a
* copy must lie within requestedRegion. So the region we can send as a
* copy is the intersection of the copyRegion with both the requestedRegion
* and the requestedRegion translated by the amount of the copy. We set
* updateCopyRegion to this.
*/
updateCopyRegion = sraRgnCreateRgn(cl->copyRegion);
sraRgnAnd(updateCopyRegion,cl->requestedRegion);
tmpRegion = sraRgnCreateRgn(cl->requestedRegion);
sraRgnOffset(tmpRegion,cl->copyDX,cl->copyDY);
sraRgnAnd(updateCopyRegion,tmpRegion);
sraRgnDestroy(tmpRegion);
dx = cl->copyDX;
dy = cl->copyDY;
/*
* Next we remove updateCopyRegion from updateRegion so that updateRegion
* is the part of this update which is sent as ordinary pixel data (i.e not
* a copy).
*/
sraRgnSubtract(updateRegion,updateCopyRegion);
/*
* Finally we leave modifiedRegion to be the remainder (if any) of parts of
* the screen which are modified but outside the requestedRegion. We also
* empty both the requestedRegion and the copyRegion - note that we never
* carry over a copyRegion for a future update.
*/
sraRgnOr(cl->modifiedRegion,cl->copyRegion);
sraRgnSubtract(cl->modifiedRegion,updateRegion);
sraRgnSubtract(cl->modifiedRegion,updateCopyRegion);
/* sraRgnMakeEmpty(cl->requestedRegion); */
sraRgnMakeEmpty(cl->copyRegion);
cl->copyDX = 0;
cl->copyDY = 0;
UNLOCK(cl->updateMutex);
/*
* Now send the update.
*/
cl->rfbFramebufferUpdateMessagesSent++;
if (cl->preferredEncoding == rfbEncodingCoRRE) {
nUpdateRegionRects = 0;
for(i = sraRgnGetIterator(updateRegion); sraRgnIteratorNext(i,&rect);){
int x = rect.x1;
int y = rect.y1;
int w = rect.x2 - x;
int h = rect.y2 - y;
nUpdateRegionRects += (((w-1) / cl->correMaxWidth + 1)
* ((h-1) / cl->correMaxHeight + 1));
}
} else if (cl->preferredEncoding == rfbEncodingZlib) {
nUpdateRegionRects = 0;
for(i = sraRgnGetIterator(updateRegion); sraRgnIteratorNext(i,&rect);){
int x = rect.x1;
int y = rect.y1;
int w = rect.x2 - x;
int h = rect.y2 - y;
nUpdateRegionRects += (((h-1) / (ZLIB_MAX_SIZE( w ) / w)) + 1);
}
} else if (cl->preferredEncoding == rfbEncodingTight) {
nUpdateRegionRects = 0;
for(i = sraRgnGetIterator(updateRegion); sraRgnIteratorNext(i,&rect);){
int x = rect.x1;
int y = rect.y1;
int w = rect.x2 - x;
int h = rect.y2 - y;
int n = rfbNumCodedRectsTight(cl, x, y, w, h);
if (n == 0) {
nUpdateRegionRects = 0xFFFF;
break;
}
nUpdateRegionRects += n;
}
} else {
nUpdateRegionRects = sraRgnCountRects(updateRegion);
}
fu->type = rfbFramebufferUpdate;
if (nUpdateRegionRects != 0xFFFF) {
fu->nRects = Swap16IfLE((CARD16)(sraRgnCountRects(updateCopyRegion)
+ nUpdateRegionRects + !!sendCursorShape));
} else {
fu->nRects = 0xFFFF;
}
cl->ublen = sz_rfbFramebufferUpdateMsg;
if (sendCursorShape) {
cl->cursorWasChanged = FALSE;
if (!rfbSendCursorShape(cl)) {
sraRgnDestroy(updateRegion);
return FALSE;
}
}
if (!sraRgnEmpty(updateCopyRegion)) {
if (!rfbSendCopyRegion(cl,updateCopyRegion,dx,dy)) {
sraRgnDestroy(updateRegion);
sraRgnDestroy(updateCopyRegion);
return FALSE;
}
}
sraRgnDestroy(updateCopyRegion);
for(i = sraRgnGetIterator(updateRegion); sraRgnIteratorNext(i,&rect);){
int x = rect.x1;
int y = rect.y1;
int w = rect.x2 - x;
int h = rect.y2 - y;
cl->rfbRawBytesEquivalent += (sz_rfbFramebufferUpdateRectHeader
+ w * (cl->format.bitsPerPixel / 8) * h);
switch (cl->preferredEncoding) {
case rfbEncodingRaw:
if (!rfbSendRectEncodingRaw(cl, x, y, w, h)) {
sraRgnDestroy(updateRegion);
return FALSE;
}
break;
case rfbEncodingRRE:
if (!rfbSendRectEncodingRRE(cl, x, y, w, h)) {
sraRgnDestroy(updateRegion);
return FALSE;
}
break;
case rfbEncodingCoRRE:
if (!rfbSendRectEncodingCoRRE(cl, x, y, w, h)) {
sraRgnDestroy(updateRegion);
return FALSE;
}
break;
case rfbEncodingHextile:
if (!rfbSendRectEncodingHextile(cl, x, y, w, h)) {
sraRgnDestroy(updateRegion);
return FALSE;
}
break;
case rfbEncodingZlib:
if (!rfbSendRectEncodingZlib(cl, x, y, w, h)) {
sraRgnDestroy(updateRegion);
return FALSE;
}
break;
case rfbEncodingTight:
if (!rfbSendRectEncodingTight(cl, x, y, w, h)) {
sraRgnDestroy(updateRegion);
return FALSE;
}
break;
}
}
sraRgnReleaseIterator(i);
if ( nUpdateRegionRects == 0xFFFF &&
!rfbSendLastRectMarker(cl) ) {
sraRgnDestroy(updateRegion);
return FALSE;
}
if (!rfbSendUpdateBuf(cl)) {
sraRgnDestroy(updateRegion);
return FALSE;
}
sraRgnDestroy(updateRegion);
return TRUE;
}
/*
* Send the copy region as a string of CopyRect encoded rectangles.
* The only slightly tricky thing is that we should send the messages in
* the correct order so that an earlier CopyRect will not corrupt the source
* of a later one.
*/
Bool
rfbSendCopyRegion(cl, reg, dx, dy)
rfbClientPtr cl;
sraRegionPtr reg;
int dx, dy;
{
int x, y, w, h;
rfbFramebufferUpdateRectHeader rect;
rfbCopyRect cr;
sraRectangleIterator* i;
sraRect rect1;
/* printf("copyrect: "); sraRgnPrint(reg); putchar('\n');fflush(stdout); */
i = sraRgnGetReverseIterator(reg,dx>0,dy>0);
while(sraRgnIteratorNext(i,&rect1)) {
x = rect1.x1;
y = rect1.y1;
w = rect1.x2 - x;
h = rect1.y2 - y;
rect.r.x = Swap16IfLE(x);
rect.r.y = Swap16IfLE(y);
rect.r.w = Swap16IfLE(w);
rect.r.h = Swap16IfLE(h);
rect.encoding = Swap32IfLE(rfbEncodingCopyRect);
memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,
sz_rfbFramebufferUpdateRectHeader);
cl->ublen += sz_rfbFramebufferUpdateRectHeader;
cr.srcX = Swap16IfLE(x - dx);
cr.srcY = Swap16IfLE(y - dy);
memcpy(&cl->updateBuf[cl->ublen], (char *)&cr, sz_rfbCopyRect);
cl->ublen += sz_rfbCopyRect;
cl->rfbRectanglesSent[rfbEncodingCopyRect]++;
cl->rfbBytesSent[rfbEncodingCopyRect]
+= sz_rfbFramebufferUpdateRectHeader + sz_rfbCopyRect;
}
return TRUE;
}
/*
* Send a given rectangle in raw encoding (rfbEncodingRaw).
*/
Bool
rfbSendRectEncodingRaw(cl, x, y, w, h)
rfbClientPtr cl;
int x, y, w, h;
{
rfbFramebufferUpdateRectHeader rect;
int nlines;
int bytesPerLine = w * (cl->format.bitsPerPixel / 8);
char *fbptr = (cl->screen->frameBuffer + (cl->screen->paddedWidthInBytes * y)
+ (x * (cl->screen->bitsPerPixel / 8)));
/* Flush the buffer to guarantee correct alignment for translateFn(). */
if (cl->ublen > 0) {
if (!rfbSendUpdateBuf(cl))
return FALSE;
}
rect.r.x = Swap16IfLE(x);
rect.r.y = Swap16IfLE(y);
rect.r.w = Swap16IfLE(w);
rect.r.h = Swap16IfLE(h);
rect.encoding = Swap32IfLE(rfbEncodingRaw);
memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,sz_rfbFramebufferUpdateRectHeader);
cl->ublen += sz_rfbFramebufferUpdateRectHeader;
cl->rfbRectanglesSent[rfbEncodingRaw]++;
cl->rfbBytesSent[rfbEncodingRaw]
+= sz_rfbFramebufferUpdateRectHeader + bytesPerLine * h;
nlines = (UPDATE_BUF_SIZE - cl->ublen) / bytesPerLine;
while (TRUE) {
if (nlines > h)
nlines = h;
(*cl->translateFn)(cl->translateLookupTable,
&(cl->screen->rfbServerFormat),
&cl->format, fbptr, &cl->updateBuf[cl->ublen],
cl->screen->paddedWidthInBytes, w, nlines);
cl->ublen += nlines * bytesPerLine;
h -= nlines;
if (h == 0) /* rect fitted in buffer, do next one */
return TRUE;
/* buffer full - flush partial rect and do another nlines */
if (!rfbSendUpdateBuf(cl))
return FALSE;
fbptr += (cl->screen->paddedWidthInBytes * nlines);
nlines = (UPDATE_BUF_SIZE - cl->ublen) / bytesPerLine;
if (nlines == 0) {
rfbLog("rfbSendRectEncodingRaw: send buffer too small for %d "
"bytes per line\n", bytesPerLine);
rfbCloseClient(cl);
return FALSE;
}
}
}
/*
* Send an empty rectangle with encoding field set to value of
* rfbEncodingLastRect to notify client that this is the last
* rectangle in framebuffer update ("LastRect" extension of RFB
* protocol).
*/
Bool
rfbSendLastRectMarker(cl)
rfbClientPtr cl;
{
rfbFramebufferUpdateRectHeader rect;
if (cl->ublen + sz_rfbFramebufferUpdateRectHeader > UPDATE_BUF_SIZE) {
if (!rfbSendUpdateBuf(cl))
return FALSE;
}
rect.encoding = Swap32IfLE(rfbEncodingLastRect);
rect.r.x = 0;
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;
cl->rfbLastRectMarkersSent++;
cl->rfbLastRectBytesSent += sz_rfbFramebufferUpdateRectHeader;
return TRUE;
}
/*
* Send NewFBSize pseudo-rectangle. This tells the client to change
* its framebuffer size.
*/
Bool
rfbSendNewFBSize(cl, w, h)
rfbClientPtr cl;
int w, h;
{
rfbFramebufferUpdateRectHeader rect;
if (cl->ublen + sz_rfbFramebufferUpdateRectHeader > UPDATE_BUF_SIZE) {
if (!rfbSendUpdateBuf(cl))
return FALSE;
}
rect.encoding = Swap32IfLE(rfbEncodingNewFBSize);
rect.r.x = 0;
rect.r.y = 0;
rect.r.w = Swap16IfLE(w);
rect.r.h = Swap16IfLE(h);
memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,
sz_rfbFramebufferUpdateRectHeader);
cl->ublen += sz_rfbFramebufferUpdateRectHeader;
cl->rfbLastRectMarkersSent++;
cl->rfbLastRectBytesSent += sz_rfbFramebufferUpdateRectHeader;
return TRUE;
}
/*
* Send the contents of cl->updateBuf. Returns 1 if successful, -1 if
* not (errno should be set).
*/
Bool
rfbSendUpdateBuf(cl)
rfbClientPtr cl;
{
if(cl->sock<0)
return FALSE;
if (WriteExact(cl, cl->updateBuf, cl->ublen) < 0) {
rfbLogPerror("rfbSendUpdateBuf: write");
rfbCloseClient(cl);
return FALSE;
}
cl->ublen = 0;
return TRUE;
}
/*
* rfbSendSetColourMapEntries sends a SetColourMapEntries message to the
* client, using values from the currently installed colormap.
*/
Bool
rfbSendSetColourMapEntries(cl, firstColour, nColours)
rfbClientPtr cl;
int firstColour;
int nColours;
{
char buf[sz_rfbSetColourMapEntriesMsg + 256 * 3 * 2];
rfbSetColourMapEntriesMsg *scme = (rfbSetColourMapEntriesMsg *)buf;
CARD16 *rgb = (CARD16 *)(&buf[sz_rfbSetColourMapEntriesMsg]);
rfbColourMap* cm = &cl->screen->colourMap;
int i, len;
scme->type = rfbSetColourMapEntries;
scme->firstColour = Swap16IfLE(firstColour);
scme->nColours = Swap16IfLE(nColours);
len = sz_rfbSetColourMapEntriesMsg;
for (i = 0; i < nColours; i++) {
if(i<(int)cm->count) {
if(cm->is16) {
rgb[i*3] = Swap16IfLE(cm->data.shorts[i*3]);
rgb[i*3+1] = Swap16IfLE(cm->data.shorts[i*3+1]);
rgb[i*3+2] = Swap16IfLE(cm->data.shorts[i*3+2]);
} else {
rgb[i*3] = Swap16IfLE(cm->data.bytes[i*3]);
rgb[i*3+1] = Swap16IfLE(cm->data.bytes[i*3+1]);
rgb[i*3+2] = Swap16IfLE(cm->data.bytes[i*3+2]);
}
}
}
len += nColours * 3 * 2;
if (WriteExact(cl, buf, len) < 0) {
rfbLogPerror("rfbSendSetColourMapEntries: write");
rfbCloseClient(cl);
return FALSE;
}
return TRUE;
}
/*
* rfbSendBell sends a Bell message to all the clients.
*/
void
rfbSendBell(rfbScreenInfoPtr rfbScreen)
{
rfbClientIteratorPtr i;
rfbClientPtr cl;
rfbBellMsg b;
i = rfbGetClientIterator(rfbScreen);
while((cl=rfbClientIteratorNext(i))) {
b.type = rfbBell;
if (WriteExact(cl, (char *)&b, sz_rfbBellMsg) < 0) {
rfbLogPerror("rfbSendBell: write");
rfbCloseClient(cl);
}
}
rfbReleaseClientIterator(i);
}
/*
* rfbSendServerCutText sends a ServerCutText message to all the clients.
*/
void
rfbSendServerCutText(rfbScreenInfoPtr rfbScreen,char *str, int len)
{
rfbClientPtr cl;
rfbServerCutTextMsg sct;
rfbClientIteratorPtr iterator;
iterator = rfbGetClientIterator(rfbScreen);
while ((cl = rfbClientIteratorNext(iterator)) != NULL) {
sct.type = rfbServerCutText;
sct.length = Swap32IfLE(len);
if (WriteExact(cl, (char *)&sct,
sz_rfbServerCutTextMsg) < 0) {
rfbLogPerror("rfbSendServerCutText: write");
rfbCloseClient(cl);
continue;
}
if (WriteExact(cl, str, len) < 0) {
rfbLogPerror("rfbSendServerCutText: write");
rfbCloseClient(cl);
}
}
rfbReleaseClientIterator(iterator);
}
/*****************************************************************************
*
* UDP can be used for keyboard and pointer events when the underlying
* network is highly reliable. This is really here to support ORL's
* videotile, whose TCP implementation doesn't like sending lots of small
* packets (such as 100s of pen readings per second!).
*/
unsigned char ptrAcceleration = 50;
void
rfbNewUDPConnection(rfbScreen,sock)
rfbScreenInfoPtr rfbScreen;
int sock;
{
if (write(sock, &ptrAcceleration, 1) < 0) {
rfbLogPerror("rfbNewUDPConnection: write");
}
}
/*
* Because UDP is a message based service, we can't read the first byte and
* then the rest of the packet separately like we do with TCP. We will always
* get a whole packet delivered in one go, so we ask read() for the maximum
* number of bytes we can possibly get.
*/
void
rfbProcessUDPInput(rfbScreenInfoPtr rfbScreen)
{
int n;
rfbClientPtr cl=rfbScreen->udpClient;
rfbClientToServerMsg msg;
if((!cl) || cl->onHold)
return;
if ((n = read(rfbScreen->udpSock, (char *)&msg, sizeof(msg))) <= 0) {
if (n < 0) {
rfbLogPerror("rfbProcessUDPInput: read");
}
rfbDisconnectUDPSock(rfbScreen);
return;
}
switch (msg.type) {
case rfbKeyEvent:
if (n != sz_rfbKeyEventMsg) {
rfbLog("rfbProcessUDPInput: key event incorrect length\n");
rfbDisconnectUDPSock(rfbScreen);
return;
}
cl->screen->kbdAddEvent(msg.ke.down, (KeySym)Swap32IfLE(msg.ke.key), cl);
break;
case rfbPointerEvent:
if (n != sz_rfbPointerEventMsg) {
rfbLog("rfbProcessUDPInput: ptr event incorrect length\n");
rfbDisconnectUDPSock(rfbScreen);
return;
}
cl->screen->ptrAddEvent(msg.pe.buttonMask,
Swap16IfLE(msg.pe.x), Swap16IfLE(msg.pe.y), cl);
break;
default:
rfbLog("rfbProcessUDPInput: unknown message type %d\n",
msg.type);
rfbDisconnectUDPSock(rfbScreen);
}
}
#ifdef BACKCHANNEL
void rfbSendBackChannel(rfbScreenInfoPtr rfbScreen,char* str,int len)
{
rfbClientPtr cl;
rfbBackChannelMsg sct;
rfbClientIteratorPtr iterator;
iterator = rfbGetClientIterator(rfbScreen);
while ((cl = rfbClientIteratorNext(iterator)) != NULL) {
if (cl->enableBackChannel) {
sct.type = rfbBackChannel;
sct.length = Swap32IfLE(len);
if (WriteExact(cl, (char *)&sct,
sz_rfbBackChannelMsg) < 0) {
rfbLogPerror("rfbSendBackChannel: write");
rfbCloseClient(cl);
continue;
}
if (WriteExact(cl, str, len) < 0) {
rfbLogPerror("rfbSendBackChannel: write");
rfbCloseClient(cl);
}
}
}
rfbReleaseClientIterator(iterator);
}
#endif
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