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