672 lines
21 KiB
C
672 lines
21 KiB
C
/*
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* Copyright (C) 1997, 1998 Olivetti & Oracle Research Laboratory
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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/*
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* rfbproto.h - header file for the RFB protocol version 3.3
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*
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* Uses types CARD<n> for an n-bit unsigned integer, INT<n> for an n-bit signed
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* integer (for n = 8, 16 and 32).
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*
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* All multiple byte integers are in big endian (network) order (most
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* significant byte first). Unless noted otherwise there is no special
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* alignment of protocol structures.
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*
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*
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* Once the initial handshaking is done, all messages start with a type byte,
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* (usually) followed by message-specific data. The order of definitions in
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* this file is as follows:
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*
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* (1) Structures used in several types of message.
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* (2) Structures used in the initial handshaking.
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* (3) Message types.
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* (4) Encoding types.
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* (5) For each message type, the form of the data following the type byte.
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* Sometimes this is defined by a single structure but the more complex
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* messages have to be explained by comments.
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*/
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/*****************************************************************************
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*
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* Structures used in several messages
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*
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*****************************************************************************/
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/*-----------------------------------------------------------------------------
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* Structure used to specify a rectangle. This structure is a multiple of 4
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* bytes so that it can be interspersed with 32-bit pixel data without
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* affecting alignment.
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*/
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typedef struct {
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CARD16 x;
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CARD16 y;
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CARD16 w;
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CARD16 h;
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} rfbRectangle;
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#define sz_rfbRectangle 8
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/*-----------------------------------------------------------------------------
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* Structure used to specify pixel format.
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*/
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typedef struct {
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CARD8 bitsPerPixel; /* 8,16,32 only */
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CARD8 depth; /* 8 to 32 */
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CARD8 bigEndian; /* True if multi-byte pixels are interpreted
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as big endian, or if single-bit-per-pixel
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has most significant bit of the byte
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corresponding to first (leftmost) pixel. Of
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course this is meaningless for 8 bits/pix */
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CARD8 trueColour; /* If false then we need a "colour map" to
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convert pixels to RGB. If true, xxxMax and
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xxxShift specify bits used for red, green
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and blue */
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/* the following fields are only meaningful if trueColour is true */
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CARD16 redMax; /* maximum red value (= 2^n - 1 where n is the
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number of bits used for red). Note this
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value is always in big endian order. */
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CARD16 greenMax; /* similar for green */
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CARD16 blueMax; /* and blue */
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CARD8 redShift; /* number of shifts needed to get the red
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value in a pixel to the least significant
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bit. To find the red value from a given
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pixel, do the following:
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1) Swap pixel value according to bigEndian
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(e.g. if bigEndian is false and host byte
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order is big endian, then swap).
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2) Shift right by redShift.
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3) AND with redMax (in host byte order).
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4) You now have the red value between 0 and
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redMax. */
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CARD8 greenShift; /* similar for green */
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CARD8 blueShift; /* and blue */
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CARD8 pad1;
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CARD16 pad2;
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} rfbPixelFormat;
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#define sz_rfbPixelFormat 16
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/*****************************************************************************
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*
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* Initial handshaking messages
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*
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*****************************************************************************/
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/*-----------------------------------------------------------------------------
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* Protocol Version
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*
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* The server always sends 12 bytes to start which identifies the latest RFB
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* protocol version number which it supports. These bytes are interpreted
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* as a string of 12 ASCII characters in the format "RFB xxx.yyy\n" where
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* xxx and yyy are the major and minor version numbers (for version 3.3
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* this is "RFB 003.003\n").
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*
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* The client then replies with a similar 12-byte message giving the version
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* number of the protocol which should actually be used (which may be different
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* to that quoted by the server).
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*
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* It is intended that both clients and servers may provide some level of
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* backwards compatibility by this mechanism. Servers in particular should
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* attempt to provide backwards compatibility, and even forwards compatibility
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* to some extent. For example if a client demands version 3.1 of the
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* protocol, a 3.0 server can probably assume that by ignoring requests for
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* encoding types it doesn't understand, everything will still work OK. This
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* will probably not be the case for changes in the major version number.
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*
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* The format string below can be used in sprintf or sscanf to generate or
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* decode the version string respectively.
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*/
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#define rfbProtocolVersionFormat "RFB %03d.%03d\n"
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#define rfbProtocolMajorVersion 3
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#define rfbProtocolMinorVersion 3
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typedef char rfbProtocolVersionMsg[13]; /* allow extra byte for null */
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#define sz_rfbProtocolVersionMsg 12
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/*-----------------------------------------------------------------------------
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* Authentication
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*
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* Once the protocol version has been decided, the server then sends a 32-bit
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* word indicating whether any authentication is needed on the connection.
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* The value of this word determines the authentication scheme in use. For
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* version 3.0 of the protocol this may have one of the following values:
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*/
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#define rfbConnFailed 0
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#define rfbNoAuth 1
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#define rfbVncAuth 2
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/*
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* rfbConnFailed: For some reason the connection failed (e.g. the server
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* cannot support the desired protocol version). This is
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* followed by a string describing the reason (where a
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* string is specified as a 32-bit length followed by that
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* many ASCII characters).
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*
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* rfbNoAuth: No authentication is needed.
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*
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* rfbVncAuth: The VNC authentication scheme is to be used. A 16-byte
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* challenge follows, which the client encrypts as
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* appropriate using the password and sends the resulting
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* 16-byte response. If the response is correct, the
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* server sends the 32-bit word rfbVncAuthOK. If a simple
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* failure happens, the server sends rfbVncAuthFailed and
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* closes the connection. If the server decides that too
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* many failures have occurred, it sends rfbVncAuthTooMany
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* and closes the connection. In the latter case, the
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* server should not allow an immediate reconnection by
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* the client.
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*/
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#define rfbVncAuthOK 0
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#define rfbVncAuthFailed 1
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#define rfbVncAuthTooMany 2
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/*-----------------------------------------------------------------------------
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* Client Initialisation Message
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*
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* Once the client and server are sure that they're happy to talk to one
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* another, the client sends an initialisation message. At present this
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* message only consists of a boolean indicating whether the server should try
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* to share the desktop by leaving other clients connected, or give exclusive
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* access to this client by disconnecting all other clients.
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*/
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typedef struct {
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CARD8 shared;
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} rfbClientInitMsg;
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#define sz_rfbClientInitMsg 1
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/*-----------------------------------------------------------------------------
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* Server Initialisation Message
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*
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* After the client initialisation message, the server sends one of its own.
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* This tells the client the width and height of the server's framebuffer,
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* its pixel format and the name associated with the desktop.
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*/
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typedef struct {
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CARD16 framebufferWidth;
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CARD16 framebufferHeight;
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rfbPixelFormat format; /* the server's preferred pixel format */
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CARD32 nameLength;
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/* followed by char name[nameLength] */
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} rfbServerInitMsg;
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#define sz_rfbServerInitMsg (8 + sz_rfbPixelFormat)
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/*
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* Following the server initialisation message it's up to the client to send
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* whichever protocol messages it wants. Typically it will send a
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* SetPixelFormat message and a SetEncodings message, followed by a
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* FramebufferUpdateRequest. From then on the server will send
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* FramebufferUpdate messages in response to the client's
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* FramebufferUpdateRequest messages. The client should send
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* FramebufferUpdateRequest messages with incremental set to true when it has
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* finished processing one FramebufferUpdate and is ready to process another.
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* With a fast client, the rate at which FramebufferUpdateRequests are sent
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* should be regulated to avoid hogging the network.
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*/
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/*****************************************************************************
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*
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* Message types
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*
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*****************************************************************************/
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/* server -> client */
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#define rfbFramebufferUpdate 0
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#define rfbSetColourMapEntries 1
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#define rfbBell 2
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#define rfbServerCutText 3
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/* client -> server */
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#define rfbSetPixelFormat 0
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#define rfbFixColourMapEntries 1 /* not currently supported */
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#define rfbSetEncodings 2
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#define rfbFramebufferUpdateRequest 3
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#define rfbKeyEvent 4
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#define rfbPointerEvent 5
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#define rfbClientCutText 6
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/*****************************************************************************
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*
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* Encoding types
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*
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*****************************************************************************/
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#define rfbEncodingRaw 0
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#define rfbEncodingCopyRect 1
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#define rfbEncodingRRE 2
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#define rfbEncodingCoRRE 4
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#define rfbEncodingHextile 5
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/*****************************************************************************
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*
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* Server -> client message definitions
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*
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*****************************************************************************/
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/*-----------------------------------------------------------------------------
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* FramebufferUpdate - a block of rectangles to be copied to the framebuffer.
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*
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* This message consists of a header giving the number of rectangles of pixel
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* data followed by the rectangles themselves. The header is padded so that
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* together with the type byte it is an exact multiple of 4 bytes (to help
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* with alignment of 32-bit pixels):
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*/
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typedef struct {
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CARD8 type; /* always rfbFramebufferUpdate */
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CARD8 pad;
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CARD16 nRects;
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/* followed by nRects rectangles */
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} rfbFramebufferUpdateMsg;
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#define sz_rfbFramebufferUpdateMsg 4
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/*
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* Each rectangle of pixel data consists of a header describing the position
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* and size of the rectangle and a type word describing the encoding of the
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* pixel data, followed finally by the pixel data. Note that if the client has
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* not sent a SetEncodings message then it will only receive raw pixel data.
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* Also note again that this structure is a multiple of 4 bytes.
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*/
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typedef struct {
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rfbRectangle r;
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CARD32 encoding; /* one of the encoding types rfbEncoding... */
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} rfbFramebufferUpdateRectHeader;
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#define sz_rfbFramebufferUpdateRectHeader (sz_rfbRectangle + 4)
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/*- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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* Raw Encoding. Pixels are sent in top-to-bottom scanline order,
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* left-to-right within a scanline with no padding in between.
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*/
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/*- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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* CopyRect Encoding. The pixels are specified simply by the x and y position
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* of the source rectangle.
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*/
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typedef struct {
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CARD16 srcX;
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CARD16 srcY;
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} rfbCopyRect;
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#define sz_rfbCopyRect 4
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/*- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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* RRE - Rise-and-Run-length Encoding. We have an rfbRREHeader structure
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* giving the number of subrectangles following. Finally the data follows in
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* the form [<bgpixel><subrect><subrect>...] where each <subrect> is
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* [<pixel><rfbRectangle>].
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*/
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typedef struct {
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CARD32 nSubrects;
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} rfbRREHeader;
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#define sz_rfbRREHeader 4
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/*- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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* CoRRE - Compact RRE Encoding. We have an rfbRREHeader structure giving
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* the number of subrectangles following. Finally the data follows in the form
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* [<bgpixel><subrect><subrect>...] where each <subrect> is
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* [<pixel><rfbCoRRERectangle>]. This means that
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* the whole rectangle must be at most 255x255 pixels.
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*/
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typedef struct {
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CARD8 x;
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CARD8 y;
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CARD8 w;
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CARD8 h;
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} rfbCoRRERectangle;
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#define sz_rfbCoRRERectangle 4
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/*- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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* Hextile Encoding. The rectangle is divided up into "tiles" of 16x16 pixels,
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* starting at the top left going in left-to-right, top-to-bottom order. If
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* the width of the rectangle is not an exact multiple of 16 then the width of
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* the last tile in each row will be correspondingly smaller. Similarly if the
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* height is not an exact multiple of 16 then the height of each tile in the
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* final row will also be smaller. Each tile begins with a "subencoding" type
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* byte, which is a mask made up of a number of bits. If the Raw bit is set
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* then the other bits are irrelevant; w*h pixel values follow (where w and h
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* are the width and height of the tile). Otherwise the tile is encoded in a
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* similar way to RRE, except that the position and size of each subrectangle
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* can be specified in just two bytes. The other bits in the mask are as
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* follows:
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*
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* BackgroundSpecified - if set, a pixel value follows which specifies
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* the background colour for this tile. The first non-raw tile in a
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* rectangle must have this bit set. If this bit isn't set then the
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* background is the same as the last tile.
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*
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* ForegroundSpecified - if set, a pixel value follows which specifies
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* the foreground colour to be used for all subrectangles in this tile.
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* If this bit is set then the SubrectsColoured bit must be zero.
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*
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* AnySubrects - if set, a single byte follows giving the number of
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* subrectangles following. If not set, there are no subrectangles (i.e.
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* the whole tile is just solid background colour).
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*
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* SubrectsColoured - if set then each subrectangle is preceded by a pixel
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* value giving the colour of that subrectangle. If not set, all
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* subrectangles are the same colour, the foreground colour; if the
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* ForegroundSpecified bit wasn't set then the foreground is the same as
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* the last tile.
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*
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* The position and size of each subrectangle is specified in two bytes. The
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* Pack macros below can be used to generate the two bytes from x, y, w, h,
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* and the Extract macros can be used to extract the x, y, w, h values from
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* the two bytes.
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*/
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#define rfbHextileRaw (1 << 0)
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#define rfbHextileBackgroundSpecified (1 << 1)
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#define rfbHextileForegroundSpecified (1 << 2)
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#define rfbHextileAnySubrects (1 << 3)
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#define rfbHextileSubrectsColoured (1 << 4)
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#define rfbHextilePackXY(x,y) (((x) << 4) | (y))
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#define rfbHextilePackWH(w,h) ((((w)-1) << 4) | ((h)-1))
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#define rfbHextileExtractX(byte) ((byte) >> 4)
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#define rfbHextileExtractY(byte) ((byte) & 0xf)
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#define rfbHextileExtractW(byte) (((byte) >> 4) + 1)
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#define rfbHextileExtractH(byte) (((byte) & 0xf) + 1)
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/*-----------------------------------------------------------------------------
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* SetColourMapEntries - these messages are only sent if the pixel
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* format uses a "colour map" (i.e. trueColour false) and the client has not
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* fixed the entire colour map using FixColourMapEntries. In addition they
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* will only start being sent after the client has sent its first
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* FramebufferUpdateRequest. So if the client always tells the server to use
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* trueColour then it never needs to process this type of message.
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*/
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typedef struct {
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CARD8 type; /* always rfbSetColourMapEntries */
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CARD8 pad;
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CARD16 firstColour;
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CARD16 nColours;
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/* Followed by nColours * 3 * CARD16
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r1, g1, b1, r2, g2, b2, r3, g3, b3, ..., rn, bn, gn */
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} rfbSetColourMapEntriesMsg;
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#define sz_rfbSetColourMapEntriesMsg 6
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/*-----------------------------------------------------------------------------
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* Bell - ring a bell on the client if it has one.
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*/
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typedef struct {
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CARD8 type; /* always rfbBell */
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} rfbBellMsg;
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#define sz_rfbBellMsg 1
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/*-----------------------------------------------------------------------------
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* ServerCutText - the server has new text in its cut buffer.
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*/
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typedef struct {
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CARD8 type; /* always rfbServerCutText */
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CARD8 pad1;
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CARD16 pad2;
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CARD32 length;
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/* followed by char text[length] */
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} rfbServerCutTextMsg;
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#define sz_rfbServerCutTextMsg 8
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/*-----------------------------------------------------------------------------
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* Union of all server->client messages.
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*/
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typedef union {
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CARD8 type;
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rfbFramebufferUpdateMsg fu;
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rfbSetColourMapEntriesMsg scme;
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rfbBellMsg b;
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rfbServerCutTextMsg sct;
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} rfbServerToClientMsg;
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/*****************************************************************************
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*
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* Message definitions (client -> server)
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*
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*****************************************************************************/
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/*-----------------------------------------------------------------------------
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* SetPixelFormat - tell the RFB server the format in which the client wants
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* pixels sent.
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*/
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typedef struct {
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CARD8 type; /* always rfbSetPixelFormat */
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CARD8 pad1;
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CARD16 pad2;
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rfbPixelFormat format;
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} rfbSetPixelFormatMsg;
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#define sz_rfbSetPixelFormatMsg (sz_rfbPixelFormat + 4)
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/*-----------------------------------------------------------------------------
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* FixColourMapEntries - when the pixel format uses a "colour map", fix
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* read-only colour map entries.
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*
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* ***************** NOT CURRENTLY SUPPORTED *****************
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*/
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typedef struct {
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CARD8 type; /* always rfbFixColourMapEntries */
|
|
CARD8 pad;
|
|
CARD16 firstColour;
|
|
CARD16 nColours;
|
|
|
|
/* Followed by nColours * 3 * CARD16
|
|
r1, g1, b1, r2, g2, b2, r3, g3, b3, ..., rn, bn, gn */
|
|
|
|
} rfbFixColourMapEntriesMsg;
|
|
|
|
#define sz_rfbFixColourMapEntriesMsg 6
|
|
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* SetEncodings - tell the RFB server which encoding types we accept. Put them
|
|
* in order of preference, if we have any. We may always receive raw
|
|
* encoding, even if we don't specify it here.
|
|
*/
|
|
|
|
typedef struct {
|
|
CARD8 type; /* always rfbSetEncodings */
|
|
CARD8 pad;
|
|
CARD16 nEncodings;
|
|
/* followed by nEncodings * CARD32 encoding types */
|
|
} rfbSetEncodingsMsg;
|
|
|
|
#define sz_rfbSetEncodingsMsg 4
|
|
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* FramebufferUpdateRequest - request for a framebuffer update. If incremental
|
|
* is true then the client just wants the changes since the last update. If
|
|
* false then it wants the whole of the specified rectangle.
|
|
*/
|
|
|
|
typedef struct {
|
|
CARD8 type; /* always rfbFramebufferUpdateRequest */
|
|
CARD8 incremental;
|
|
CARD16 x;
|
|
CARD16 y;
|
|
CARD16 w;
|
|
CARD16 h;
|
|
} rfbFramebufferUpdateRequestMsg;
|
|
|
|
#define sz_rfbFramebufferUpdateRequestMsg 10
|
|
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* KeyEvent - key press or release
|
|
*
|
|
* Keys are specified using the "keysym" values defined by the X Window System.
|
|
* For most ordinary keys, the keysym is the same as the corresponding ASCII
|
|
* value. Other common keys are:
|
|
*
|
|
* BackSpace 0xff08
|
|
* Tab 0xff09
|
|
* Return or Enter 0xff0d
|
|
* Escape 0xff1b
|
|
* Insert 0xff63
|
|
* Delete 0xffff
|
|
* Home 0xff50
|
|
* End 0xff57
|
|
* Page Up 0xff55
|
|
* Page Down 0xff56
|
|
* Left 0xff51
|
|
* Up 0xff52
|
|
* Right 0xff53
|
|
* Down 0xff54
|
|
* F1 0xffbe
|
|
* F2 0xffbf
|
|
* ... ...
|
|
* F12 0xffc9
|
|
* Shift 0xffe1
|
|
* Control 0xffe3
|
|
* Meta 0xffe7
|
|
* Alt 0xffe9
|
|
*/
|
|
|
|
typedef struct {
|
|
CARD8 type; /* always rfbKeyEvent */
|
|
CARD8 down; /* true if down (press), false if up */
|
|
CARD16 pad;
|
|
CARD32 key; /* key is specified as an X keysym */
|
|
} rfbKeyEventMsg;
|
|
|
|
#define sz_rfbKeyEventMsg 8
|
|
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* PointerEvent - mouse/pen move and/or button press.
|
|
*/
|
|
|
|
typedef struct {
|
|
CARD8 type; /* always rfbPointerEvent */
|
|
CARD8 buttonMask; /* bits 0-7 are buttons 1-8, 0=up, 1=down */
|
|
CARD16 x;
|
|
CARD16 y;
|
|
} rfbPointerEventMsg;
|
|
|
|
#define rfbButton1Mask 1
|
|
#define rfbButton2Mask 2
|
|
#define rfbButton3Mask 4
|
|
|
|
#define sz_rfbPointerEventMsg 6
|
|
|
|
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* ClientCutText - the client has new text in its cut buffer.
|
|
*/
|
|
|
|
typedef struct {
|
|
CARD8 type; /* always rfbClientCutText */
|
|
CARD8 pad1;
|
|
CARD16 pad2;
|
|
CARD32 length;
|
|
/* followed by char text[length] */
|
|
} rfbClientCutTextMsg;
|
|
|
|
#define sz_rfbClientCutTextMsg 8
|
|
|
|
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* Union of all client->server messages.
|
|
*/
|
|
|
|
typedef union {
|
|
CARD8 type;
|
|
rfbSetPixelFormatMsg spf;
|
|
rfbFixColourMapEntriesMsg fcme;
|
|
rfbSetEncodingsMsg se;
|
|
rfbFramebufferUpdateRequestMsg fur;
|
|
rfbKeyEventMsg ke;
|
|
rfbPointerEventMsg pe;
|
|
rfbClientCutTextMsg cct;
|
|
} rfbClientToServerMsg;
|