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/*
* VncClientProtocol.h - header file for the VncClientProtocol class
*
* Copyright (c) 2017-2021 Tobias Junghans <tobydox@veyon.io>
*
* This file is part of Veyon - https://veyon.io
*
* This program 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 program 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 program (see COPYING); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#pragma once
#include <QRect>
#include "rfb/rfbproto.h"
#include "CryptoCore.h"
class QBuffer;
class QTcpSocket;
class VEYON_CORE_EXPORT VncClientProtocol
{
public:
using Password = CryptoCore::SecureArray;
enum State {
Disconnected,
Protocol,
SecurityInit,
SecurityChallenge,
SecurityResult,
FramebufferInit,
Running,
StateCount
} ;
VncClientProtocol( QTcpSocket* socket, const Password& vncPassword );
State state() const
{
return m_state;
}
void start();
bool read(); // Flawfinder: ignore
const QByteArray& serverInitMessage() const
{
return m_serverInitMessage;
}
int framebufferWidth() const
{
return m_framebufferWidth;
}
int framebufferHeight() const
{
return m_framebufferHeight;
}
bool setPixelFormat( rfbPixelFormat pixelFormat );
bool setEncodings( const QVector<uint32_t>& encodings );
void requestFramebufferUpdate( bool incremental );
bool receiveMessage();
const QByteArray& lastMessage() const
{
return m_lastMessage;
}
uint8_t lastMessageType() const
{
return static_cast<uint8_t>( m_lastMessage.constData()[0] );
}
const QRect& lastUpdatedRect() const
{
return m_lastUpdatedRect;
}
private:
bool readProtocol();
bool receiveSecurityTypes();
bool receiveSecurityChallenge();
bool receiveSecurityResult();
bool receiveServerInitMessage();
bool receiveFramebufferUpdateMessage();
bool receiveColourMapEntriesMessage();
bool receiveBellMessage();
bool receiveCutTextMessage();
bool receiveResizeFramebufferMessage();
bool receiveXvpMessage();
bool readMessage( int size );
bool handleRect( QBuffer& buffer, rfbFramebufferUpdateRectHeader rectHeader );
bool handleRectEncodingRRE( QBuffer& buffer, uint bytesPerPixel );
bool handleRectEncodingCoRRE( QBuffer& buffer, uint bytesPerPixel );
bool handleRectEncodingHextile( QBuffer& buffer,
const rfbFramebufferUpdateRectHeader rectHeader,
uint bytesPerPixel );
bool handleRectEncodingZlib( QBuffer& buffer );
bool handleRectEncodingZRLE( QBuffer& buffer );
static bool isPseudoEncoding( rfbFramebufferUpdateRectHeader header );
static constexpr auto MaximumMessageSize = 4096*4096*4;
QTcpSocket* m_socket;
State m_state;
Password m_vncPassword;
QByteArray m_serverInitMessage;
rfbPixelFormat m_pixelFormat;
quint16 m_framebufferWidth;
quint16 m_framebufferHeight;
QByteArray m_lastMessage;
QRect m_lastUpdatedRect;
} ;
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