void NegotiateDesktop()
{
byte shareDesktopSetting = _c.ReceiveByte();//是否同意分享屏幕
bool shareDesktop = shareDesktopSetting != 0;
var e = new CreatingDesktopEventArgs(shareDesktop);
OnCreatingDesktop(e);
var fbSource = _fbSource;
Framebuffer = fbSource != null?fbSource.Capture() : null;
VncStream.Require(Framebuffer != null,
"No framebuffer. Make sure you've called SetFramebufferSource. It can be set to a VncFramebuffer.",
VncFailureReason.SanityCheckFailed);
_clientPixelFormat = Framebuffer.PixelFormat;
_clientWidth = Framebuffer.Width; _clientHeight = Framebuffer.Height;
_fbuAutoCache = null;
_c.SendUInt16BE((ushort)Framebuffer.Width);
_c.SendUInt16BE((ushort)Framebuffer.Height);
var pixelFormat = new byte[VncPixelFormat.Size];
Framebuffer.PixelFormat.Encode(pixelFormat, 0);
_c.Send(pixelFormat);
_c.SendString(Framebuffer.Name, true);
}
private void NegotiateDesktop()
{
this.logger?.Log(LogLevel.Info, () => "Negotiating desktop settings");
byte shareDesktopSetting = this.c.ReceiveByte();
bool shareDesktop = shareDesktopSetting != 0;
var e = new CreatingDesktopEventArgs(shareDesktop);
this.OnCreatingDesktop(e);
var fbSource = this.fbSource;
this.Framebuffer = fbSource != null?fbSource.Capture() : null;
VncStream.Require(
this.Framebuffer != null,
"No framebuffer. Make sure you've called SetFramebufferSource. It can be set to a VncFramebuffer.",
VncFailureReason.SanityCheckFailed);
this.clientPixelFormat = this.Framebuffer.PixelFormat;
this.clientWidth = this.Framebuffer.Width;
this.clientHeight = this.Framebuffer.Height;
this.fbuAutoCache = null;
this.c.SendUInt16BE((ushort)this.Framebuffer.Width);
this.c.SendUInt16BE((ushort)this.Framebuffer.Height);
var pixelFormat = new byte[VncPixelFormat.Size];
this.Framebuffer.PixelFormat.Encode(pixelFormat, 0);
this.c.Send(pixelFormat);
this.c.SendString(this.Framebuffer.Name, true);
this.logger?.Log(LogLevel.Info, () => $"The desktop {this.Framebuffer.Name} has initialized with pixel format {this.clientPixelFormat}; the screen size is {this.clientWidth}x{this.clientHeight}");
}
private void NegotiateSecurity(AuthenticationMethod[] methods)
{
this.logger?.Log(LogLevel.Info, () => "Negotiating security");
this.c.SendByte((byte)methods.Length);
VncStream.Require(
methods.Length > 0,
"Client is not allowed in.",
VncFailureReason.NoSupportedAuthenticationMethods);
foreach (var method in methods)
{
this.c.SendByte((byte)method);
}
var selectedMethod = (AuthenticationMethod)this.c.ReceiveByte();
VncStream.Require(
methods.Contains(selectedMethod),
"Invalid authentication method.",
VncFailureReason.UnrecognizedProtocolElement);
bool success = true;
if (selectedMethod == AuthenticationMethod.Password)
{
var challenge = this.passwordChallenge.GenerateChallenge();
using (new Utility.AutoClear(challenge))
{
this.c.Send(challenge);
var response = this.c.Receive(16);
using (new Utility.AutoClear(response))
{
var e = new PasswordProvidedEventArgs(this.passwordChallenge, challenge, response);
this.OnPasswordProvided(e);
success = e.IsAuthenticated;
}
}
}
this.c.SendUInt32BE(success ? 0 : (uint)1);
VncStream.Require(
success,
"Failed to authenticate.",
VncFailureReason.AuthenticationFailed);
this.logger?.Log(LogLevel.Info, () => "The user authenticated successfully.");
this.securityNegotiated = true;
}
void NegotiateSecurity(AuthenticationMethod[] methods)
{
_c.SendByte((byte)methods.Length);
//验证密码
VncStream.Require(methods.Length > 0,
"Client is not allowed in.",
VncFailureReason.NoSupportedAuthenticationMethods);
foreach (var method in methods)
{
_c.SendByte((byte)method);
}
var selectedMethod = (AuthenticationMethod)_c.ReceiveByte();
VncStream.Require(methods.Contains(selectedMethod),
"Invalid authentication method.",
VncFailureReason.UnrecognizedProtocolElement);
bool success = true;
if (selectedMethod == AuthenticationMethod.Password)
{
var challenge = VncPasswordChallenge.GenerateChallenge();
using (new Utility.AutoClear(challenge))
{
_c.Send(challenge);
var response = _c.Receive(16);
using (new Utility.AutoClear(response))
{
var e = new PasswordProvidedEventArgs(challenge, response);
OnPasswordProvided(e);
success = e.IsAuthenticated;
}
}
}
_c.SendUInt32BE(success ? 0 : (uint)1);
if (!success)
{
_c.SendString("Password authentication failed!", true);
}
VncStream.Require(success,
"Failed to authenticate.",
VncFailureReason.AuthenticationFailed);
}
private void ThreadMain()
{
this.requester = new Utility.PeriodicThread();
try
{
this.InitFramebufferEncoder();
AuthenticationMethod[] methods;
this.NegotiateVersion(out methods);
this.NegotiateSecurity(methods);
this.NegotiateDesktop();
this.NegotiateEncodings();
this.requester.Start(() => this.FramebufferSendChanges(), () => this.MaxUpdateRate, false);
this.IsConnected = true;
this.logger?.Log(LogLevel.Info, () => "The client has connected successfully");
this.OnConnected();
while (true)
{
var command = (VncMessageType)this.c.ReceiveByte();
this.logger?.Log(LogLevel.Info, () => $"Received the {command} command.");
switch (command)
{
case VncMessageType.SetPixelFormat:
this.HandleSetPixelFormat();
break;
case VncMessageType.SetEncodings:
this.HandleSetEncodings();
break;
case VncMessageType.FrameBufferUpdateRequest:
this.HandleFramebufferUpdateRequest();
break;
case VncMessageType.KeyEvent:
this.HandleKeyEvent();
break;
case VncMessageType.PointerEvent:
this.HandlePointerEvent();
break;
case VncMessageType.ClientCutText:
this.HandleReceiveClipboardData();
break;
default:
VncStream.Require(
false,
"Unsupported command.",
VncFailureReason.UnrecognizedProtocolElement);
break;
}
}
}
catch (Exception exception)
{
this.logger?.Log(LogLevel.Error, () => $"VNC server session stopped due to: {exception.Message}");
}
this.requester.Stop();
this.c.Stream = null;
if (this.IsConnected)
{
this.IsConnected = false;
this.OnClosed();
}
else
{
this.OnConnectionFailed();
}
}
void ThreadMain()
{
_requester = new Utility.PeriodicThread();
try
{
InitFramebufferEncoder();
AuthenticationMethod[] methods;
NegotiateVersion(out methods);
NegotiateSecurity(methods);
NegotiateDesktop();//绘画的桌面
NegotiateEncodings();
_requester.Start(FramebufferSendChanges, () => MaxUpdateRate, false);
IsConnected = true; OnConnected();
while (true)
{
var command = _c.ReceiveByte();
switch (command)
{
case 0:
HandleSetPixelFormat();
break;
case 2:
HandleSetEncodings();
break;
case 3:
HandleFramebufferUpdateRequest();
break;
case 4:
HandleKeyEvent();
break;
case 5:
HandlePointerEvent();
break;
case 6:
HandleReceiveClipboardData();
break;
default:
VncStream.Require(false, "Unsupported command.",
VncFailureReason.UnrecognizedProtocolElement);
break;
}
}
}
catch (ObjectDisposedException ex)
{
}
catch (IOException ex)
{
}
catch (VncException ex)
{
//Vnc错误
}
_requester.Stop();
_c.Stream = null;
if (IsConnected)
{
IsConnected = false; OnClosed();
}
else
{
OnConnectionFailed();
}
}
/// <summary>
/// Reads the next client message and handles it.
/// </summary>
/// <remarks>
/// The <see cref="VncServerSession"/> starts a main thread which read and processes messages.
/// You don't normally need to call this method yourself; but it can be usefull when writing
/// unit tests.
/// </remarks>
public void HandleMessage()
{
var command = (VncMessageType)this.c.ReceiveByte();
// If the same command is sent repeatedly (e.g. FramebufferUpdateRequest), suppress repeated requests
if (this.previousCommand != command || this.commandCount >= 25)
{
if (this.commandCount > 0)
{
this.logger?.LogInformation($"Suppressed {this.commandCount} notifications of the {command} command at the Info level.");
}
this.logger?.LogInformation($"Received the {command} command.");
this.commandCount = 0;
}
else
{
this.logger?.LogDebug($"Received the {command} command");
this.commandCount++;
}
this.previousCommand = command;
switch (command)
{
case VncMessageType.SetPixelFormat:
this.HandleSetPixelFormat();
break;
case VncMessageType.SetEncodings:
this.HandleSetEncodings();
break;
case VncMessageType.FrameBufferUpdateRequest:
this.HandleFramebufferUpdateRequest();
break;
case VncMessageType.KeyEvent:
this.HandleKeyEvent();
break;
case VncMessageType.PointerEvent:
this.HandlePointerEvent();
break;
case VncMessageType.ClientCutText:
this.HandleReceiveClipboardData();
break;
case VncMessageType.SetDesktopSize:
this.HandleSetDesktopSize();
break;
default:
VncStream.Require(
false,
"Unsupported command.",
VncFailureReason.UnrecognizedProtocolElement);
break;
}
}
