mirror of
https://github.com/kasmtech/KasmVNC.git
synced 2024-12-04 22:11:32 +01:00
259 lines
10 KiB
C++
259 lines
10 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
|
|
* Copyright 2011 Pierre Ossman for Cendio AB
|
|
*
|
|
* 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.
|
|
*/
|
|
//
|
|
// SConnection - class on the server side representing a connection to a
|
|
// client. A derived class should override methods appropriately.
|
|
//
|
|
|
|
#ifndef __RFB_SCONNECTION_H__
|
|
#define __RFB_SCONNECTION_H__
|
|
|
|
#include <rdr/InStream.h>
|
|
#include <rdr/OutStream.h>
|
|
#include <rfb/SMsgHandler.h>
|
|
#include <rfb/SecurityServer.h>
|
|
|
|
namespace rfb {
|
|
|
|
class SMsgReader;
|
|
class SMsgWriter;
|
|
class SSecurity;
|
|
|
|
class SConnection : public SMsgHandler {
|
|
public:
|
|
|
|
SConnection();
|
|
virtual ~SConnection();
|
|
|
|
// Methods to initialise the connection
|
|
|
|
// setStreams() sets the streams to be used for the connection. These must
|
|
// be set before initialiseProtocol() and processMsg() are called. The
|
|
// SSecurity object may call setStreams() again to provide alternative
|
|
// streams over which the RFB protocol is sent (i.e. encrypting/decrypting
|
|
// streams). Ownership of the streams remains with the caller
|
|
// (i.e. SConnection will not delete them).
|
|
void setStreams(rdr::InStream* is, rdr::OutStream* os);
|
|
|
|
// initialiseProtocol() should be called once the streams and security
|
|
// types are set. Subsequently, processMsg() should be called whenever
|
|
// there is data to read on the InStream.
|
|
void initialiseProtocol();
|
|
|
|
// processMsg() should be called whenever there is data to read on the
|
|
// InStream. You must have called initialiseProtocol() first.
|
|
void processMsg();
|
|
|
|
// approveConnection() is called to either accept or reject the connection.
|
|
// If accept is false, the reason string gives the reason for the
|
|
// rejection. It can either be called directly from queryConnection() or
|
|
// later, after queryConnection() has returned. It can only be called when
|
|
// in state RFBSTATE_QUERYING. On rejection, an AuthFailureException is
|
|
// thrown, so this must be handled appropriately by the caller.
|
|
void approveConnection(bool accept, const char* reason=0);
|
|
|
|
|
|
// Overridden from SMsgHandler
|
|
|
|
virtual void setEncodings(int nEncodings, const rdr::S32* encodings);
|
|
|
|
virtual void clientCutText(const char* str, int len);
|
|
|
|
virtual void handleClipboardRequest(rdr::U32 flags);
|
|
virtual void handleClipboardPeek(rdr::U32 flags);
|
|
virtual void handleClipboardNotify(rdr::U32 flags);
|
|
virtual void handleClipboardProvide(rdr::U32 flags,
|
|
const size_t* lengths,
|
|
const rdr::U8* const* data);
|
|
|
|
virtual void supportsQEMUKeyEvent();
|
|
|
|
// Methods to be overridden in a derived class
|
|
|
|
// versionReceived() indicates that the version number has just been read
|
|
// from the client. The version will already have been "cooked"
|
|
// to deal with unknown/bogus viewer protocol numbers.
|
|
virtual void versionReceived();
|
|
|
|
// authSuccess() is called when authentication has succeeded.
|
|
virtual void authSuccess();
|
|
|
|
// queryConnection() is called when authentication has succeeded, but
|
|
// before informing the client. It can be overridden to query a local user
|
|
// to accept the incoming connection, for example. The userName argument
|
|
// is the name of the user making the connection, or null (note that the
|
|
// storage for userName is owned by the caller). The connection must be
|
|
// accepted or rejected by calling approveConnection(), either directly
|
|
// from queryConnection() or some time later.
|
|
virtual void queryConnection(const char* userName);
|
|
|
|
// clientInit() is called when the ClientInit message is received. The
|
|
// derived class must call on to SConnection::clientInit().
|
|
virtual void clientInit(bool shared);
|
|
|
|
// setPixelFormat() is called when a SetPixelFormat message is received.
|
|
// The derived class must call on to SConnection::setPixelFormat().
|
|
virtual void setPixelFormat(const PixelFormat& pf);
|
|
|
|
// framebufferUpdateRequest() is called when a FramebufferUpdateRequest
|
|
// message is received. The derived class must call on to
|
|
// SConnection::framebufferUpdateRequest().
|
|
virtual void framebufferUpdateRequest(const Rect& r, bool incremental);
|
|
|
|
// fence() is called when we get a fence request or response. By default
|
|
// it responds directly to requests (stating it doesn't support any
|
|
// synchronisation) and drops responses. Override to implement more proper
|
|
// support.
|
|
virtual void fence(rdr::U32 flags, unsigned len, const char data[]);
|
|
|
|
// enableContinuousUpdates() is called when the client wants to enable
|
|
// or disable continuous updates, or change the active area.
|
|
virtual void enableContinuousUpdates(bool enable,
|
|
int x, int y, int w, int h);
|
|
|
|
// handleClipboardRequest() is called whenever the client requests
|
|
// the server to send over its clipboard data. It will only be
|
|
// called after the server has first announced a clipboard change
|
|
// via announceClipboard().
|
|
virtual void handleClipboardRequest();
|
|
|
|
// handleClipboardAnnounce() is called to indicate a change in the
|
|
// clipboard on the client. Call requestClipboard() to access the
|
|
// actual data.
|
|
virtual void handleClipboardAnnounce(bool available);
|
|
|
|
// handleClipboardData() is called when the client has sent over
|
|
// the clipboard data as a result of a previous call to
|
|
// requestClipboard(). Note that this function might never be
|
|
// called if the clipboard data was no longer available when the
|
|
// client received the request.
|
|
virtual void handleClipboardData(const char* data, int len);
|
|
|
|
|
|
virtual void add_changed_all() {}
|
|
|
|
// setAccessRights() allows a security package to limit the access rights
|
|
// of a VNCSConnectionST to the server. How the access rights are treated
|
|
// is up to the derived class.
|
|
|
|
typedef rdr::U16 AccessRights;
|
|
static const AccessRights AccessView; // View display contents
|
|
static const AccessRights AccessKeyEvents; // Send key events
|
|
static const AccessRights AccessPtrEvents; // Send pointer events
|
|
static const AccessRights AccessCutText; // Send/receive clipboard events
|
|
static const AccessRights AccessSetDesktopSize; // Change desktop size
|
|
static const AccessRights AccessNonShared; // Exclusive access to the server
|
|
static const AccessRights AccessDefault; // The default rights, INCLUDING FUTURE ONES
|
|
static const AccessRights AccessNoQuery; // Connect without local user accepting
|
|
static const AccessRights AccessFull; // All of the available AND FUTURE rights
|
|
virtual void setAccessRights(AccessRights ar) = 0;
|
|
|
|
// Other methods
|
|
|
|
// requestClipboard() will result in a request to the client to
|
|
// transfer its clipboard data. A call to handleClipboardData()
|
|
// will be made once the data is available.
|
|
virtual void requestClipboard();
|
|
|
|
// announceClipboard() informs the client of changes to the
|
|
// clipboard on the server. The client may later request the
|
|
// clipboard data via handleClipboardRequest().
|
|
virtual void announceClipboard(bool available);
|
|
|
|
// sendClipboardData() transfers the clipboard data to the client
|
|
// and should be called whenever the client has requested the
|
|
// clipboard via handleClipboardRequest().
|
|
virtual void sendClipboardData(const char* data, int len);
|
|
|
|
|
|
// authenticated() returns true if the client has authenticated
|
|
// successfully.
|
|
bool authenticated() { return (state_ == RFBSTATE_INITIALISATION ||
|
|
state_ == RFBSTATE_NORMAL); }
|
|
|
|
// throwConnFailedException() prints a message to the log, sends a conn
|
|
// failed message to the client (if possible) and throws a
|
|
// ConnFailedException.
|
|
void throwConnFailedException(const char* format, ...) __printf_attr(2, 3);
|
|
|
|
// writeConnFailedFromScratch() sends a conn failed message to an OutStream
|
|
// without the need to negotiate the protocol version first. It actually
|
|
// does this by assuming that the client will understand version 3.3 of the
|
|
// protocol.
|
|
static void writeConnFailedFromScratch(const char* msg,
|
|
rdr::OutStream* os);
|
|
|
|
SMsgReader* reader() { return reader_; }
|
|
SMsgWriter* writer() { return writer_; }
|
|
|
|
rdr::InStream* getInStream() { return is; }
|
|
rdr::OutStream* getOutStream() { return os; }
|
|
|
|
enum stateEnum {
|
|
RFBSTATE_UNINITIALISED,
|
|
RFBSTATE_PROTOCOL_VERSION,
|
|
RFBSTATE_SECURITY_TYPE,
|
|
RFBSTATE_SECURITY,
|
|
RFBSTATE_QUERYING,
|
|
RFBSTATE_INITIALISATION,
|
|
RFBSTATE_NORMAL,
|
|
RFBSTATE_CLOSING,
|
|
RFBSTATE_INVALID
|
|
};
|
|
|
|
stateEnum state() { return state_; }
|
|
|
|
rdr::S32 getPreferredEncoding() { return preferredEncoding; }
|
|
|
|
protected:
|
|
void setState(stateEnum s) { state_ = s; }
|
|
|
|
void setReader(SMsgReader *r) { reader_ = r; }
|
|
void setWriter(SMsgWriter *w) { writer_ = w; }
|
|
|
|
private:
|
|
void writeFakeColourMap(void);
|
|
|
|
bool readyForSetColourMapEntries;
|
|
|
|
void processVersionMsg();
|
|
void processSecurityTypeMsg();
|
|
void processSecurityType(int secType);
|
|
void processSecurityMsg();
|
|
void processInitMsg();
|
|
|
|
int defaultMajorVersion, defaultMinorVersion;
|
|
rdr::InStream* is;
|
|
rdr::OutStream* os;
|
|
SMsgReader* reader_;
|
|
SMsgWriter* writer_;
|
|
SecurityServer security;
|
|
SSecurity* ssecurity;
|
|
stateEnum state_;
|
|
rdr::S32 preferredEncoding;
|
|
|
|
char* clientClipboard;
|
|
bool hasLocalClipboard;
|
|
};
|
|
}
|
|
|
|
#define WRITER_PERMS (AccessKeyEvents | AccessPtrEvents | AccessCutText | AccessSetDesktopSize)
|
|
|
|
#endif
|