/* * rfbserver.c - deal with server-side of the RFB protocol. */ /* * Copyright (C) 2002 RealVNC Ltd. * OSXvnc Copyright (C) 2001 Dan McGuirk . * 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 #include #include #ifdef LIBVNCSERVER_HAVE_FCNTL_H #include #endif #ifdef WIN32 #define write(sock,buf,len) send(sock,buf,len,0) #else #ifdef LIBVNCSERVER_HAVE_UNISTD_H #include #endif #include #ifdef LIBVNCSERVER_HAVE_SYS_SOCKET_H #include #endif #ifdef LIBVNCSERVER_HAVE_NETINET_IN_H #include #include #include #endif #endif #ifdef CORBA #include #endif #ifdef DEBUGPROTO #undef DEBUGPROTO #define DEBUGPROTO(x) x #else #define DEBUGPROTO(x) #endif /* from cursor.c */ void rfbShowCursor(rfbClientPtr cl); void rfbHideCursor(rfbClientPtr cl); void rfbRedrawAfterHideCursor(rfbClientPtr cl,sraRegionPtr updateRegion); 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 MUTEX(rfbClientListMutex); #endif struct rfbClientIterator { rfbClientPtr next; rfbScreenInfoPtr screen; }; void rfbClientListInit(rfbScreenInfoPtr rfbScreen) { if(sizeof(rfbBool)!=1) { /* a sanity check */ fprintf(stderr,"rfbBool's size is not 1 (%d)!\n",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 = 0; i->screen = rfbScreen; 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 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; rfbBool isUDP; { rfbProtocolVersionMsg pv; rfbClientIteratorPtr iterator; rfbClientPtr cl,cl_; struct sockaddr_in addr; size_t addrlen = sizeof(struct sockaddr_in); cl = (rfbClientPtr)calloc(sizeof(rfbClientRec),1); cl->screen = rfbScreen; cl->sock = sock; cl->viewOnly = FALSE; rfbResetStats(cl); 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 = rfbEncodingRaw; cl->correMaxWidth = 48; cl->correMaxHeight = 48; #ifdef LIBVNCSERVER_HAVE_LIBZ cl->zrleData = 0; #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_LIBJPEG cl->tightCompressLevel = TIGHT_DEFAULT_COMPRESSION; cl->tightQualityLevel = -1; { int i; for (i = 0; i < 4; i++) cl->zsActive[i] = FALSE; } #endif cl->enableCursorShapeUpdates = FALSE; cl->enableCursorPosUpdates = FALSE; cl->useRichCursorEncoding = FALSE; cl->enableLastRectEncoding = FALSE; 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; sprintf(pv,rfbProtocolVersionFormat,rfbProtocolMajorVersion, rfbProtocolMinorVersion); if (rfbWriteExact(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 = rfbDoNothingWithClient; 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->clientHead = cl->next; if (cl->next) cl->next->prev = cl->prev; if(cl->sock) close(cl->sock); #ifdef LIBVNCSERVER_HAVE_LIBZ FreeZrleData(cl); #endif #ifdef LIBVNCSERVER_HAVE_LIBPTHREAD if(cl->screen->backgroundLoop != FALSE) do { LOCK(cl->refCountMutex); i=cl->refCount; UNLOCK(cl->refCountMutex); if(i>0) WAIT(cl->deleteCond,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 = 0; sraRgnDestroy(cl->modifiedRegion); sraRgnDestroy(cl->requestedRegion); sraRgnDestroy(cl->copyRegion); 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 = 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 %1024s\n",&major_,&minor_,name) != 3) { rfbErr("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 */ rfbErr("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); ((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(cl) rfbClientPtr cl; { rfbClientInitMsg ci; char buf[256]; rfbServerInitMsg *si = (rfbServerInitMsg *)buf; int len, n; rfbClientIteratorPtr iterator; rfbClientPtr otherCl; if ((n = rfbReadExact(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->serverFormat; 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 (rfbWriteExact(cl, buf, sz_rfbServerInitMsg + len) < 0) { rfbLogPerror("rfbProcessClientInitMessage: write"); rfbCloseClient(cl); return; } 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); } } } static rfbBool rectSwapIfLEAndClip(uint16_t* x,uint16_t* y,uint16_t* w,uint16_t* h, rfbScreenInfoPtr screen) { *x=Swap16IfLE(*x); *y=Swap16IfLE(*y); *w=Swap16IfLE(*w); *h=Swap16IfLE(*h); if(*w>screen->width-*x) *w=screen->width-*x; /* possible underflow */ if(*w>screen->width-*x) return FALSE; if(*h>screen->height-*y) *h=screen->height-*y; if(*h>screen->height-*y) return FALSE; return TRUE; } /* * 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 = 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); return; case rfbFixColourMapEntries: if ((n = rfbReadExact(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; uint32_t enc; 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); 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: 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; #ifdef LIBVNCSERVER_HAVE_LIBZ case rfbEncodingZlib: if (cl->preferredEncoding == -1) { cl->preferredEncoding = enc; rfbLog("Using zlib encoding for client %s\n", cl->host); } break; #ifdef LIBVNCSERVER_HAVE_LIBJPEG case rfbEncodingTight: if (cl->preferredEncoding == -1) { cl->preferredEncoding = enc; rfbLog("Using tight encoding for client %s\n", cl->host); } break; #endif #endif 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,0); 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,0); 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; #ifdef LIBVNCSERVER_BACKCHANNEL case rfbEncodingBackChannel: if (!cl->enableBackChannel) { rfbLog("Enabling BackChannel protocol extension for " "client %s\n", cl->host); cl->enableBackChannel = TRUE; } break; #endif #ifdef LIBVNCSERVER_HAVE_LIBZ case rfbEncodingZRLE: if (cl->preferredEncoding == -1) { cl->preferredEncoding = enc; rfbLog("Using ZRLE encoding for client %s\n", cl->host); } break; #endif 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 rfbLog("rfbProcessClientNormalMessage: ignoring unknown " "encoding type %d\n", (int)enc); } } if (cl->preferredEncoding == -1) { cl->preferredEncoding = rfbEncodingRaw; } if (cl->enableCursorPosUpdates && !cl->enableCursorShapeUpdates) { rfbLog("Disabling cursor position updates for client %s\n", cl->host); cl->enableCursorPosUpdates = FALSE; } return; } case rfbFramebufferUpdateRequest: { sraRegionPtr tmpRegion; if ((n = rfbReadExact(cl, ((char *)&msg) + 1, sz_rfbFramebufferUpdateRequestMsg-1)) <= 0) { if (n != 0) rfbLogPerror("rfbProcessClientNormalMessage: read"); rfbCloseClient(cl); return; } if(!rectSwapIfLEAndClip(&msg.fur.x,&msg.fur.y,&msg.fur.w,&msg.fur.h, cl->screen)) return; tmpRegion = sraRgnCreateRect(msg.fur.x, msg.fur.y, msg.fur.x+msg.fur.w, msg.fur.y+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->keyEventsRcvd++; if ((n = rfbReadExact(cl, ((char *)&msg) + 1, sz_rfbKeyEventMsg - 1)) <= 0) { if (n != 0) rfbLogPerror("rfbProcessClientNormalMessage: read"); rfbCloseClient(cl); return; } if(!cl->viewOnly) { cl->screen->kbdAddEvent(msg.ke.down, (rfbKeySym)Swap32IfLE(msg.ke.key), cl); } return; case rfbPointerEvent: cl->pointerEventsRcvd++; if ((n = rfbReadExact(cl, ((char *)&msg) + 1, sz_rfbPointerEventMsg - 1)) <= 0) { if (n != 0) rfbLogPerror("rfbProcessClientNormalMessage: read"); rfbCloseClient(cl); return; } if (cl->screen->pointerClient && cl->screen->pointerClient != cl) return; if (msg.pe.buttonMask == 0) cl->screen->pointerClient = 0; else cl->screen->pointerClient = cl; if(!cl->viewOnly) { cl->screen->ptrAddEvent(msg.pe.buttonMask, Swap16IfLE(msg.pe.x), Swap16IfLE(msg.pe.y), cl); } return; case rfbClientCutText: if ((n = rfbReadExact(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 = rfbReadExact(cl, str, msg.cct.length)) <= 0) { if (n != 0) rfbLogPerror("rfbProcessClientNormalMessage: read"); free(str); rfbCloseClient(cl); return; } if(!cl->viewOnly) { cl->screen->setXCutText(str, msg.cct.length, cl); } free(str); return; default: if(cl->screen->processCustomClientMessage(cl,msg.type)) return; 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. */ rfbBool rfbSendFramebufferUpdate(cl, givenUpdateRegion) rfbClientPtr cl; sraRegionPtr givenUpdateRegion; { sraRectangleIterator* i=0; sraRect rect; int nUpdateRegionRects; rfbFramebufferUpdateMsg *fu = (rfbFramebufferUpdateMsg *)cl->updateBuf; sraRegionPtr updateRegion,updateCopyRegion,tmpRegion; int dx, dy; rfbBool sendCursorShape = FALSE; rfbBool sendCursorPos = FALSE; rfbBool result = TRUE; 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->framebufferUpdateMessagesSent++; 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->cursorWasChanged && cl->readyForSetColourMapEntries) sendCursorShape = TRUE; } /* * Do we plan to send cursor position update? */ if (cl->enableCursorPosUpdates && cl->cursorWasMoved) sendCursorPos = TRUE; 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); if(cl->screen->progressiveSliceHeight>0) { int height=cl->screen->progressiveSliceHeight, y=cl->progressiveSliceY; sraRegionPtr bbox=sraRgnBBox(updateRegion); sraRect rect; if(sraRgnPopRect(bbox,&rect,0)) { sraRegionPtr slice; if(y=rect.y2) y=rect.y1; slice=sraRgnCreateRect(0,y,cl->screen->width,y+height); sraRgnAnd(updateRegion,slice); sraRgnDestroy(slice); } sraRgnDestroy(bbox); y+=height; if(y>=cl->screen->height) y=0; cl->progressiveSliceY=y; } sraRgnOr(updateRegion,cl->copyRegion); if(!sraRgnAnd(updateRegion,cl->requestedRegion) && sraRgnEmpty(updateRegion) && (cl->enableCursorShapeUpdates || (cl->cursorX == cl->screen->cursorX && cl->cursorY == cl->screen->cursorY)) && !sendCursorShape && !sendCursorPos) { 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); /* TODO: is this sensible? sraRgnMakeEmpty(cl->requestedRegion); */ sraRgnMakeEmpty(cl->copyRegion); cl->copyDX = 0; cl->copyDY = 0; UNLOCK(cl->updateMutex); if (!cl->enableCursorShapeUpdates) { if(cl->cursorX != cl->screen->cursorX || cl->cursorY != cl->screen->cursorY) { rfbRedrawAfterHideCursor(cl,updateRegion); LOCK(cl->screen->cursorMutex); cl->cursorX = cl->screen->cursorX; cl->cursorY = cl->screen->cursorY; UNLOCK(cl->screen->cursorMutex); rfbRedrawAfterHideCursor(cl,updateRegion); } rfbShowCursor(cl); } /* * Now send the update. */ cl->framebufferUpdateMessagesSent++; 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; int rectsPerRow = (w-1)/cl->correMaxWidth+1; int rows = (h-1)/cl->correMaxHeight+1; nUpdateRegionRects += rectsPerRow*rows; } sraRgnReleaseIterator(i); #ifdef LIBVNCSERVER_HAVE_LIBZ } 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); } sraRgnReleaseIterator(i); #ifdef LIBVNCSERVER_HAVE_LIBJPEG } 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; } sraRgnReleaseIterator(i); #endif #endif } else { nUpdateRegionRects = sraRgnCountRects(updateRegion); } fu->type = rfbFramebufferUpdate; if (nUpdateRegionRects != 0xFFFF) { if(cl->screen->maxRectsPerUpdate>0 #ifdef LIBVNCSERVER_HAVE_LIBJPEG /* Tight encoding counts the rectangles differently */ && cl->preferredEncoding != rfbEncodingTight && cl->preferredEncoding != rfbEncodingCoRRE #endif && nUpdateRegionRects>cl->screen->maxRectsPerUpdate) { sraRegion* newUpdateRegion = sraRgnBBox(updateRegion); sraRgnDestroy(updateRegion); updateRegion = newUpdateRegion; nUpdateRegionRects = sraRgnCountRects(updateRegion); } fu->nRects = Swap16IfLE((uint16_t)(sraRgnCountRects(updateCopyRegion) + nUpdateRegionRects + !!sendCursorShape + !!sendCursorPos)); } else { fu->nRects = 0xFFFF; } cl->ublen = sz_rfbFramebufferUpdateMsg; if (sendCursorShape) { cl->cursorWasChanged = FALSE; if (!rfbSendCursorShape(cl)) goto updateFailed; } if (sendCursorPos) { cl->cursorWasMoved = FALSE; if (!rfbSendCursorPos(cl)) goto updateFailed; } if (!sraRgnEmpty(updateCopyRegion)) { if (!rfbSendCopyRegion(cl,updateCopyRegion,dx,dy)) goto updateFailed; } 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->rawBytesEquivalent += (sz_rfbFramebufferUpdateRectHeader + w * (cl->format.bitsPerPixel / 8) * h); switch (cl->preferredEncoding) { case rfbEncodingRaw: if (!rfbSendRectEncodingRaw(cl, x, y, w, h)) goto updateFailed; break; case rfbEncodingRRE: if (!rfbSendRectEncodingRRE(cl, x, y, w, h)) goto updateFailed; break; case rfbEncodingCoRRE: if (!rfbSendRectEncodingCoRRE(cl, x, y, w, h)) goto updateFailed; break; case rfbEncodingHextile: if (!rfbSendRectEncodingHextile(cl, x, y, w, h)) goto updateFailed; break; #ifdef LIBVNCSERVER_HAVE_LIBZ case rfbEncodingZlib: if (!rfbSendRectEncodingZlib(cl, x, y, w, h)) goto updateFailed; break; #ifdef LIBVNCSERVER_HAVE_LIBJPEG case rfbEncodingTight: if (!rfbSendRectEncodingTight(cl, x, y, w, h)) goto updateFailed; break; #endif #endif #ifdef LIBVNCSERVER_HAVE_LIBZ case rfbEncodingZRLE: if (!rfbSendRectEncodingZRLE(cl, x, y, w, h)) goto updateFailed; break; #endif } } if ( nUpdateRegionRects == 0xFFFF && !rfbSendLastRectMarker(cl) ) goto updateFailed; if (!rfbSendUpdateBuf(cl)) { updateFailed: result = FALSE; } if (!cl->enableCursorShapeUpdates) { rfbHideCursor(cl); } if(i) sraRgnReleaseIterator(i); sraRgnDestroy(updateRegion); return result; } /* * 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. */ rfbBool 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->rectanglesSent[rfbEncodingCopyRect]++; cl->bytesSent[rfbEncodingCopyRect] += sz_rfbFramebufferUpdateRectHeader + sz_rfbCopyRect; } return TRUE; } /* * Send a given rectangle in raw encoding (rfbEncodingRaw). */ rfbBool 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->rectanglesSent[rfbEncodingRaw]++; cl->bytesSent[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->serverFormat), &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) { rfbErr("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). */ rfbBool 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->lastRectMarkersSent++; cl->lastRectBytesSent += sz_rfbFramebufferUpdateRectHeader; return TRUE; } /* * Send NewFBSize pseudo-rectangle. This tells the client to change * its framebuffer size. */ rfbBool 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->lastRectMarkersSent++; cl->lastRectBytesSent += sz_rfbFramebufferUpdateRectHeader; return TRUE; } /* * Send the contents of cl->updateBuf. Returns 1 if successful, -1 if * not (errno should be set). */ rfbBool rfbSendUpdateBuf(cl) rfbClientPtr cl; { if(cl->sock<0) return FALSE; if (rfbWriteExact(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. */ rfbBool rfbSendSetColourMapEntries(cl, firstColour, nColours) rfbClientPtr cl; int firstColour; int nColours; { char buf[sz_rfbSetColourMapEntriesMsg + 256 * 3 * 2]; rfbSetColourMapEntriesMsg *scme = (rfbSetColourMapEntriesMsg *)buf; uint16_t *rgb = (uint16_t *)(&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 (rfbWriteExact(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 (rfbWriteExact(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 (rfbWriteExact(cl, (char *)&sct, sz_rfbServerCutTextMsg) < 0) { rfbLogPerror("rfbSendServerCutText: write"); rfbCloseClient(cl); continue; } if (rfbWriteExact(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) { rfbErr("rfbProcessUDPInput: key event incorrect length\n"); rfbDisconnectUDPSock(rfbScreen); return; } cl->screen->kbdAddEvent(msg.ke.down, (rfbKeySym)Swap32IfLE(msg.ke.key), cl); break; case rfbPointerEvent: if (n != sz_rfbPointerEventMsg) { rfbErr("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: rfbErr("rfbProcessUDPInput: unknown message type %d\n", msg.type); rfbDisconnectUDPSock(rfbScreen); } } #ifdef LIBVNCSERVER_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 (rfbWriteExact(cl, (char *)&sct, sz_rfbBackChannelMsg) < 0) { rfbLogPerror("rfbSendBackChannel: write"); rfbCloseClient(cl); continue; } if (rfbWriteExact(cl, str, len) < 0) { rfbLogPerror("rfbSendBackChannel: write"); rfbCloseClient(cl); } } } rfbReleaseClientIterator(iterator); } #endif