/// <summary>
/// Performs VNC Authentication using VNC DES encryption. See the RFB Protocol doc 6.2.2.
/// </summary>
/// <param name="password">A string containing the user's password in clear text format.</param>
protected void PerformVncAuthentication(string password)
{
byte[] challenge = rfb.ReadSecurityChallenge();
rfb.WriteSecurityResponse(EncryptChallenge(password, challenge));
}
// vnc client handling - main thread
private void RunNetThread()
{
while (!terminate)
{
if (autoconnect && host != "")
{
try
{
sleeptime = 0;
Log.Info("Connecting to \"" + host + ":" + port + "\"...");
rfb = new RfbProtocol();
rfb.Connect(host, (int)port);
Log.Debug("Connected.");
rfb.ReadProtocolVersion();
// Handle possible repeater connection
if (rfb.ServerVersion == 0.0)
{
rfb.WriteProxyAddress();
// Now we are connected to the real server; read the protocol version of the
// server
rfb.ReadProtocolVersion();
// Resume normal handshake and protocol
}
rfb.WriteProtocolVersion();
Log.Debug("Protocol Version:" + rfb.ServerVersion);
// Figure out which type of authentication the server uses
byte[] types = rfb.ReadSecurityTypes();
// Based on what the server sends back in the way of supported Security Types, one of
// two things will need to be done: either the server will reject the connection (i.e., type = 0),
// or a list of supported types will be sent, of which we need to choose and use one.
if (types.Length > 0)
{
if (types[0] == 0)
{
// The server is not able (or willing) to accept the connection.
// A message follows indicating why the connection was dropped.
throw new Exception("Connection Failed. The server rejected the connection for the following reason: " + rfb.ReadSecurityFailureReason());
}
else
{
byte securityType = GetSupportedSecurityType(types);
if (securityType == 0)
{
throw new Exception("Unknown Security Type(s), The server sent one or more unknown Security Types.");
}
rfb.WriteSecurityType(securityType);
// Protocol 3.8 states that a SecurityResult is still sent when using NONE (see 6.2.1)
if (rfb.ServerVersion >= 3.799f && rfb.ServerVersion <= 3.801 && securityType == 1)
{
if (rfb.ReadSecurityResult() > 0)
{
// For some reason, the server is not accepting the connection. Get the
// reason and throw an exception
throw new Exception("Unable to Connect to the Server. The Server rejected the connection for the following reason: " + rfb.ReadSecurityFailureReason());
}
}
if (securityType > 1)
{
byte[] challenge = rfb.ReadSecurityChallenge();
rfb.WriteSecurityResponse(EncryptChallenge(pass, challenge));
if (rfb.ReadSecurityResult() != 0)
{
// Authentication failed, and if the server is using Protocol version 3.8, a
// plain text message follows indicating why the error happend. I'm not
// currently using this message, but it is read here to clean out the stream.
// In earlier versions of the protocol, the server will just drop the connection.
autoconnect = false;
if (rfb.ServerVersion == 3.8)
{
throw new Exception("The server denyes the authentication. Reason: \"" + rfb.ReadSecurityFailureReason() + "\"");
}
throw new Exception("The server denyes the authentication.");
}
}
}
}
else
{
// Something is wrong, since we should have gotten at least 1 Security Type
throw new Exception("Protocol Error Connecting to Server. The Server didn't send any Security Types during the initial handshake.");
}
// Finish initializing protocol with host
rfb.WriteClientInitialisation(shared);
buffer = rfb.ReadServerInit();
rfb.WriteSetPixelFormat(buffer); // just use the server's framebuffer format
if (hideRemoteCursor)
{
rfb.WriteSetEncodings(new int[]
{
RfbProtocol.ZRLE_ENCODING,
RfbProtocol.HEXTILE_ENCODING,
RfbProtocol.RRE_ENCODING,
RfbProtocol.COPYRECT_ENCODING,
RfbProtocol.RAW_ENCODING,
RfbProtocol.CURSOR_PSEUDO_ENCODING
});
}
else
{
rfb.WriteSetEncodings(new int[]
{
RfbProtocol.ZRLE_ENCODING,
RfbProtocol.HEXTILE_ENCODING,
RfbProtocol.RRE_ENCODING,
RfbProtocol.COPYRECT_ENCODING,
RfbProtocol.RAW_ENCODING
});
}
// Create an EncodedRectangleFactory so that EncodedRectangles can be built according to set pixel layout
factory = new EncodedRectangleFactory(rfb, buffer);
// Get the initial destkop from the host
rfb.WriteFramebufferUpdateRequest(0, 0, (ushort)buffer.Width, (ushort)buffer.Height, false);
while (!terminate && autoconnect)
{
switch (rfb.ReadServerMessageType())
{
case RfbProtocol.FRAMEBUFFER_UPDATE:
int rectangles = rfb.ReadFramebufferUpdate();
for (int i = 0; i < rectangles; ++i)
{
// Get the update rectangle's info
Rectangle rectangle;
int enc;
rfb.ReadFramebufferUpdateRectHeader(out rectangle, out enc);
// Build a derived EncodedRectangle type and pull-down all the pixel info
EncodedRectangle er = factory.Build(rectangle, enc);
er.Decode();
er.Draw();
}
break;
case RfbProtocol.BELL:
Log.Debug("Bell");
break;
case RfbProtocol.SERVER_CUT_TEXT:
rfb.ReadServerCutText();
Log.Debug("server-cut-text");
break;
case RfbProtocol.SET_COLOUR_MAP_ENTRIES:
Log.Debug("SET_COLOUR_MAP_ENTRIES");
rfb.ReadColourMapEntry();
break;
default:
throw new Exception("Unknown messagetype.");
}
invalid = true;
rfb.WriteFramebufferUpdateRequest(0, 0, (ushort)buffer.Width, (ushort)buffer.Height, true);
}
}
catch (SocketException)
{
Log.Info("Unable to connect to the server. Retry in 60s.");
sleeptime = 60000;
}
catch (IOException e)
{
Log.Debug("Exception in NetThread(" + e.GetType().ToString() + "): " + e.Message);
}
catch (Exception e)
{
Log.Error("Exception in NetThread(" + e.GetType().ToString() + "): " + e.Message);
sleeptime = 10000;
}
try
{
rfb.Close();
}
catch (Exception) {}
rfb = null;
buffer = null;
factory = null;
invalid = true;
Thread.Sleep(sleeptime);
}
}
}