rfbclient.h

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#ifndef RFBCLIENT_H
#define RFBCLIENT_H
 
/*
 *  Copyright (C) 2017 D. R. Commander.  All Rights Reserved.
 *  Copyright (C) 2000, 2001 Const Kaplinsky.  All Rights Reserved.
 *  Copyright (C) 2000 Tridia Corporation.  All Rights Reserved.
 *  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 WIN32
#define WIN32_LEAN_AND_MEAN /* Prevent loading any Winsock 1.x headers from windows.h */
#ifdef _MSC_VER
#pragma warning(disable:4996)
#endif
#endif
 
#if defined(ANDROID) || defined(LIBVNCSERVER_HAVE_ANDROID)
#include <arpa/inet.h>
#include <sys/select.h>
#endif
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if LIBVNCSERVER_HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#if LIBVNCSERVER_HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <rfb/rfbproto.h>
#include <rfb/keysym.h>
#include <rfb/threading.h>
 
#ifdef LIBVNCSERVER_HAVE_SASL
#include <sasl/sasl.h>
#endif /* LIBVNCSERVER_HAVE_SASL */
 
#define rfbClientSwap16IfLE(s) \
    (*(char *)&client->endianTest ? ((((s) & 0xff) << 8) | (((s) >> 8) & 0xff)) : (s))
 
#define rfbClientSwap32IfLE(l) \
    (*(char *)&client->endianTest ? ((((l) >> 24) & 0x000000ff) | \
                             (((l) & 0x00ff0000) >> 8)  | \
                             (((l) & 0x0000ff00) << 8)  | \
                             (((l) & 0x000000ff) << 24))  : (l))
 
#define rfbClientSwap64IfLE(l) \
    (*(char *)&client->endianTest ? ((((l) >> 56 ) & 0x00000000000000ffULL) | \
                             (((l) & 0x00ff000000000000ULL) >> 40)  | \
                             (((l) & 0x0000ff0000000000ULL) >> 24)  | \
                             (((l) & 0x000000ff00000000ULL) >> 8)  | \
                             (((l) & 0x00000000ff000000ULL) << 8)  | \
                             (((l) & 0x0000000000ff0000ULL) << 24)  | \
                             (((l) & 0x000000000000ff00ULL) << 40)  | \
                             (((l) & 0x00000000000000ffULL) << 56))  : (l))
 
#define FLASH_PORT_OFFSET 5400
#define LISTEN_PORT_OFFSET 5500
#define TUNNEL_PORT_OFFSET 5500
#define SERVER_PORT_OFFSET 5900
 
#define DEFAULT_CONNECT_TIMEOUT 60
#define DEFAULT_READ_TIMEOUT 0
 
#define DEFAULT_SSH_CMD "/usr/bin/ssh"
#define DEFAULT_TUNNEL_CMD  \
  (DEFAULT_SSH_CMD " -f -L %L:localhost:%R %H sleep 20")
#define DEFAULT_VIA_CMD     \
  (DEFAULT_SSH_CMD " -f -L %L:%H:%R %G sleep 20")
 
#if(defined __cplusplus)
extern "C"
{
#endif
 
typedef struct {
  FILE* file;
  struct timeval tv;
  rfbBool readTimestamp;
  rfbBool doNotSleep;
} rfbVNCRec;
 
typedef struct rfbClientData {
        void* tag;
        void* data;
        struct rfbClientData* next;
} rfbClientData;
 
typedef struct {
  rfbBool shareDesktop;
  rfbBool viewOnly;
 
  const char* encodingsString;
 
  rfbBool useBGR233;
  int nColours;
  rfbBool forceOwnCmap;
  rfbBool forceTrueColour;
  int requestedDepth;
 
  int compressLevel;
  int qualityLevel;
  rfbBool enableJPEG;
  rfbBool useRemoteCursor;
  rfbBool palmVNC;  
  int scaleSetting; 
} AppData;
 
typedef union _rfbCredential
{
  struct
  {
    char *x509CACertFile;
    char *x509CACrlFile;
    char *x509ClientCertFile;
    char *x509ClientKeyFile;
    uint8_t x509CrlVerifyMode; /* Only required for OpenSSL - see meanings below */
  } x509Credential;
  struct
  {
    char *username;
    char *password;
  } userCredential;
} rfbCredential;
 
#define rfbCredentialTypeX509 1
#define rfbCredentialTypeUser 2
 
/* When using OpenSSL, CRLs can be included in both the x509CACrlFile and appended
   to the x509CACertFile as is common with OpenSSL.  When rfbX509CrlVerifyAll is
   specified the CRL list must include CRLs for all certificates in the chain */
#define rfbX509CrlVerifyNone   0    /* No CRL checking is performed */
#define rfbX509CrlVerifyClient 1    /* Only the leaf server certificate is checked */
#define rfbX509CrlVerifyAll    2    /* All certificates in the server chain are checked */
 
struct _rfbClient;
 
typedef void (*HandleTextChatProc)(struct _rfbClient* client, int value, char *text);
typedef void (*HandleXvpMsgProc)(struct _rfbClient* client, uint8_t version, uint8_t opcode);
typedef void (*HandleKeyboardLedStateProc)(struct _rfbClient* client, int value, int pad);
typedef rfbBool (*HandleCursorPosProc)(struct _rfbClient* client, int x, int y);
typedef void (*SoftCursorLockAreaProc)(struct _rfbClient* client, int x, int y, int w, int h);
typedef void (*SoftCursorUnlockScreenProc)(struct _rfbClient* client);
typedef void (*GotFrameBufferUpdateProc)(struct _rfbClient* client, int x, int y, int w, int h);
typedef void (*FinishedFrameBufferUpdateProc)(struct _rfbClient* client);
typedef char* (*GetPasswordProc)(struct _rfbClient* client);
typedef rfbCredential* (*GetCredentialProc)(struct _rfbClient* client, int credentialType);
typedef rfbBool (*MallocFrameBufferProc)(struct _rfbClient* client);
typedef void (*GotXCutTextProc)(struct _rfbClient* client, const char *text, int textlen);
typedef void (*BellProc)(struct _rfbClient* client);
typedef void (*GotCursorShapeProc)(struct _rfbClient* client, int xhot, int yhot, int width, int height, int bytesPerPixel);
typedef void (*GotCopyRectProc)(struct _rfbClient* client, int src_x, int src_y, int w, int h, int dest_x, int dest_y);
typedef void (*GotFillRectProc)(struct _rfbClient* client, int x, int y, int w, int h, uint32_t colour);
typedef void (*GotBitmapProc)(struct _rfbClient* client, const uint8_t* buffer, int x, int y, int w, int h);
typedef rfbBool (*GotJpegProc)(struct _rfbClient* client, const uint8_t* buffer, int length, int x, int y, int w, int h);
typedef rfbBool (*LockWriteToTLSProc)(struct _rfbClient* client);   
typedef rfbBool (*UnlockWriteToTLSProc)(struct _rfbClient* client); 
#ifdef LIBVNCSERVER_HAVE_SASL
typedef char* (*GetUserProc)(struct _rfbClient* client);
typedef char* (*GetSASLMechanismProc)(struct _rfbClient* client, char* mechlist);
#endif /* LIBVNCSERVER_HAVE_SASL */
 
typedef struct _rfbClient {
        uint8_t* frameBuffer;
        int width, height;
 
        int endianTest;
 
        AppData appData;
 
        const char* programName;
        char* serverHost;
        int serverPort; 
        rfbBool listenSpecified;
        int listenPort, flashPort;
 
        struct {
                int x, y, w, h;
        } updateRect;
 
#define RFB_BUFFER_SIZE (640*480)
        char buffer[RFB_BUFFER_SIZE];
 
        /* rfbproto.c */
 
        rfbSocket sock;
        rfbBool canUseCoRRE;
        rfbBool canUseHextile;
        char *desktopName;
        rfbPixelFormat format;
        rfbServerInitMsg si;
 
        /* sockets.c */
#define RFB_BUF_SIZE 8192
        char buf[RFB_BUF_SIZE];
        char *bufoutptr;
        unsigned int buffered;
 
        /* The zlib encoding requires expansion/decompression/deflation of the
           compressed data in the "buffer" above into another, result buffer.
           However, the size of the result buffer can be determined precisely
           based on the bitsPerPixel, height and width of the rectangle.  We
           allocate this buffer one time to be the full size of the buffer. */
 
        /* Ultra Encoding uses this buffer too */
        
        int ultra_buffer_size;
        char *ultra_buffer;
 
        int raw_buffer_size;
        char *raw_buffer;
 
#ifdef LIBVNCSERVER_HAVE_LIBZ
        z_stream decompStream;
        rfbBool decompStreamInited;
#endif
 
 
#ifdef LIBVNCSERVER_HAVE_LIBZ
        /*
         * Variables for the ``tight'' encoding implementation.
         */
 
#define ZLIB_BUFFER_SIZE 30000
        char zlib_buffer[ZLIB_BUFFER_SIZE];
 
        /* Four independent compression streams for zlib library. */
        z_stream zlibStream[4];
        rfbBool zlibStreamActive[4];
 
        /* Filter stuff. Should be initialized by filter initialization code. */
        rfbBool cutZeros;
        int rectWidth, rectColors;
        char tightPalette[256*4];
        uint8_t tightPrevRow[2048*3*sizeof(uint16_t)];
 
#ifdef LIBVNCSERVER_HAVE_LIBJPEG
        rfbBool jpegError;
 
        struct jpeg_source_mgr* jpegSrcManager;
        void* jpegBufferPtr;
        size_t jpegBufferLen;
 
#endif
#endif
 
 
        /* cursor.c */
        uint8_t *rcSource, *rcMask;
 
        rfbClientData* clientData;
 
        rfbVNCRec* vncRec;
 
        /* Keyboard State support (is 'Caps Lock' set on the remote display???) */
        int KeyboardLedStateEnabled;
        int CurrentKeyboardLedState;
 
        int canHandleNewFBSize;
 
        /* hooks */
        HandleTextChatProc         HandleTextChat;
        HandleKeyboardLedStateProc HandleKeyboardLedState;
        HandleCursorPosProc HandleCursorPos;
        SoftCursorLockAreaProc SoftCursorLockArea;
        SoftCursorUnlockScreenProc SoftCursorUnlockScreen;
        GotFrameBufferUpdateProc GotFrameBufferUpdate;
        GetPasswordProc GetPassword;
        MallocFrameBufferProc MallocFrameBuffer;
        GotXCutTextProc GotXCutText;
        BellProc Bell;
 
        GotCursorShapeProc GotCursorShape;
        GotCopyRectProc GotCopyRect;
 
        rfbSupportedMessages supportedMessages;
 
        int major, minor;
 
        uint32_t authScheme, subAuthScheme;
 
        void* tlsSession;
 
        GetCredentialProc GetCredential;
 
        uint32_t *clientAuthSchemes;
 
        char *destHost;
        int destPort;
 
        int QoS_DSCP;
 
        HandleXvpMsgProc           HandleXvpMsg;
 
        /* listen.c */
        rfbSocket listenSock;
 
        FinishedFrameBufferUpdateProc FinishedFrameBufferUpdate;
 
        char *listenAddress;
        /* IPv6 listen socket, address and port*/
        rfbSocket listen6Sock;
        char* listen6Address;
        int listen6Port;
 
        /* Output Window ID. When set, client application enables libvncclient to perform direct rendering in its window */
        unsigned long outputWindow;
 
        LockWriteToTLSProc LockWriteToTLS;
        UnlockWriteToTLSProc UnlockWriteToTLS;
 
        GotFillRectProc GotFillRect;
        GotBitmapProc GotBitmap;
        GotJpegProc GotJpeg;
 
#ifdef LIBVNCSERVER_HAVE_SASL
        sasl_conn_t *saslconn;
        const char *saslDecoded;
        unsigned int saslDecodedLength;
        unsigned int saslDecodedOffset;
        sasl_secret_t *saslSecret;
 
        /* Callback to allow the client to choose a preferred mechanism. The string returned will
           be freed once no longer required. */
        GetSASLMechanismProc GetSASLMechanism;
        GetUserProc GetUser;
 
#endif /* LIBVNCSERVER_HAVE_SASL */
 
#ifdef LIBVNCSERVER_HAVE_LIBZ
#ifdef LIBVNCSERVER_HAVE_LIBJPEG
        void *tjhnd;
 
#endif
#endif
        /* timeout in seconds for select() after connect() */
        unsigned int connectTimeout;
 
        /* timeout in seconds when reading from half-open connections in
         * ReadFromRFBServer() - keep at 0 to disable timeout detection and handling */
        unsigned int readTimeout;
 
        MUTEX(tlsRwMutex);
 
        rfbBool requestedResize;
        rfbExtDesktopScreen screen;
} rfbClient;
 
/* cursor.c */
extern rfbBool HandleCursorShape(rfbClient* client,int xhot, int yhot, int width, int height, uint32_t enc);
 
/* listen.c */
 
extern void listenForIncomingConnections(rfbClient* viewer);
extern int listenForIncomingConnectionsNoFork(rfbClient* viewer, int usec_timeout);
 
/* rfbproto.c */
 
extern rfbBool rfbEnableClientLogging;
typedef void (*rfbClientLogProc)(const char *format, ...);
extern rfbClientLogProc rfbClientLog,rfbClientErr;
extern rfbBool ConnectToRFBServer(rfbClient* client,const char *hostname, int port);
extern rfbBool ConnectToRFBRepeater(rfbClient* client,const char *repeaterHost, int repeaterPort, const char *destHost, int destPort);
extern void SetClientAuthSchemes(rfbClient* client,const uint32_t *authSchemes, int size);
extern rfbBool InitialiseRFBConnection(rfbClient* client);
extern rfbBool SetFormatAndEncodings(rfbClient* client);
extern rfbBool SendIncrementalFramebufferUpdateRequest(rfbClient* client);
extern rfbBool SendFramebufferUpdateRequest(rfbClient* client,
                                         int x, int y, int w, int h,
                                         rfbBool incremental);
extern rfbBool SendScaleSetting(rfbClient* client,int scaleSetting);
extern rfbBool SendPointerEvent(rfbClient* client,int x, int y, int buttonMask);
extern rfbBool SendExtDesktopSize(rfbClient* client, uint16_t width, uint16_t height);
extern rfbBool SendKeyEvent(rfbClient* client,uint32_t key, rfbBool down);
extern rfbBool SendExtendedKeyEvent(rfbClient* client, uint32_t keysym, uint32_t keycode, rfbBool down);
extern rfbBool SendClientCutText(rfbClient* client,char *str, int len);
extern rfbBool HandleRFBServerMessage(rfbClient* client);
 
extern rfbBool TextChatSend(rfbClient* client, char *text);
extern rfbBool TextChatOpen(rfbClient* client);
extern rfbBool TextChatClose(rfbClient* client);
extern rfbBool TextChatFinish(rfbClient* client);
extern rfbBool PermitServerInput(rfbClient* client, int enabled);
extern rfbBool SendXvpMsg(rfbClient* client, uint8_t version, uint8_t code);
 
extern void PrintPixelFormat(rfbPixelFormat *format);
 
extern rfbBool SupportsClient2Server(rfbClient* client, int messageType);
extern rfbBool SupportsServer2Client(rfbClient* client, int messageType);
 
/* client data */
 
void rfbClientSetClientData(rfbClient* client, void* tag, void* data);
void* rfbClientGetClientData(rfbClient* client, void* tag);
 
/* protocol extensions */
 
typedef struct _rfbClientProtocolExtension {
        int* encodings;
        rfbBool (*handleEncoding)(rfbClient* cl,
                rfbFramebufferUpdateRectHeader* rect);
        rfbBool (*handleMessage)(rfbClient* cl,
                 rfbServerToClientMsg* message);
        struct _rfbClientProtocolExtension* next;
        uint32_t const* securityTypes;
        rfbBool (*handleAuthentication)(rfbClient* cl, uint32_t authScheme);
} rfbClientProtocolExtension;
 
void rfbClientRegisterExtension(rfbClientProtocolExtension* e);
 
/* sockets.c */
 
extern rfbBool errorMessageOnReadFailure;
 
extern rfbBool ReadFromRFBServer(rfbClient* client, char *out, unsigned int n);
extern rfbBool WriteToRFBServer(rfbClient* client, const char *buf, unsigned int n);
extern int FindFreeTcpPort(void);
extern rfbSocket ListenAtTcpPort(int port);
extern rfbSocket ListenAtTcpPortAndAddress(int port, const char *address);
extern rfbSocket ConnectClientToTcpAddr(unsigned int host, int port);
extern rfbSocket ConnectClientToTcpAddr6(const char *hostname, int port);
extern rfbSocket ConnectClientToUnixSock(const char *sockFile);
extern rfbSocket ConnectClientToTcpAddrWithTimeout(unsigned int host, int port, unsigned int timeout);
extern rfbSocket ConnectClientToTcpAddr6WithTimeout(const char *hostname, int port, unsigned int timeout);
extern rfbSocket ConnectClientToUnixSockWithTimeout(const char *sockFile, unsigned int timeout);
extern rfbSocket AcceptTcpConnection(rfbSocket listenSock);
extern rfbBool SetNonBlocking(rfbSocket sock);
extern rfbBool SetBlocking(rfbSocket sock);
extern rfbBool SetDSCP(rfbSocket sock, int dscp);
 
extern rfbBool StringToIPAddr(const char *str, unsigned int *addr);
extern rfbBool SameMachine(rfbSocket sock);
extern int WaitForMessage(rfbClient* client,unsigned int usecs);
 
/* vncviewer.c */
rfbClient* rfbGetClient(int bitsPerSample,int samplesPerPixel,int bytesPerPixel);
rfbBool rfbInitClient(rfbClient* client,int* argc,char** argv);
void rfbClientCleanup(rfbClient* client);
 
#if(defined __cplusplus)
}
#endif
 
#endif