Exemple #1
0
        /// <summary>
        /// Processes the asynchronous receipt of a FLAP
        /// </summary>
        /// <param name="res">The <see cref="IAsyncResult"/> of a BeginReceive call</param>
        private void ProcessFLAP(IAsyncResult res)
        {
            int bytesreceived = 0;
            int receiveindex  = 0;

            byte[] flapbuffer = null;

            try
            {
                lock (socket)
                {
                    bytesreceived = socket.EndRead(res);
                    if (bytesreceived == 0)
                    {
                        throw new Exception("Socket receive returned 0 bytes read");
                    }

                    flapbuffer = (byte[])res.AsyncState;

                    receiveindex = bytesreceived;
                    while (receiveindex < flapbuffer.Length)
                    {
                        bytesreceived = socket.Read(flapbuffer, receiveindex, flapbuffer.Length - receiveindex);
                        if (bytesreceived == 0)
                        {
                            throw new Exception("Socket receive returned 0 bytes read");
                        }
                        receiveindex += bytesreceived;
                    }
                }
            }
            catch (Exception ex)
            {
                if (!isDisconnecting)
                {
                    Logging.WriteString("Receive error in ProcessFLAP: {0}, connection {1}", ex.Message, ID);
                    DisconnectFromServer(true);
                }
                return;
            }

            if (flapbuffer[0] == 0xFF)
            {
                int badcount = 0;
                for (badcount = 0; badcount < flapbuffer.Length && flapbuffer[badcount] == 0xFF; badcount++)
                {
                    ;
                }

                // SOMEHOW there are two bytes of 0xFF occuring when requesting
                // SNAC family 0x10 and receiving SNAC(01,03).  So that has to stop
                for (int i = badcount; i < flapbuffer.Length; i++)
                {
                    flapbuffer[i - badcount] = flapbuffer[i];
                }

                socket.Read(flapbuffer, flapbuffer.Length - badcount, badcount);
            }

            // Get the FLAP header out of the async result
            FLAPHeader flap   = GetFLAPHeader(flapbuffer);
            ByteStream stream = ReadPacket(flap.DataSize);

            if (stream == null)
            {
                return;
            }

            // The full packet is here, so we can chuck it out for processing
            DataPacket dp;

            switch (flap.Channel)
            {
            case 0x01:     // New connection negotiation
                // This will not occur, FLAP 0x01 is handled in ConnectToServer
                break;

            case 0x02:     //  SNAC data
                if (stream.GetByteCount() < 10)
                {
                    break;     // Don't return, don't disconnect, just keep on keeping on
                }

                dp                  = stream.CreateDataPacket();
                dp.FLAP             = flap;
                dp.ParentConnection = this;
                dp.ParentSession    = parent;
                Processor.Enqueue(dp);
                break;

            case 0x03:     // FLAP error
                // Session error:  FLAP error, bailing out
                Logging.WriteString("Received error FLAP");
                DisconnectFromServer(true);
                return;

            case 0x04:     // Close connection negotiation
                //KSD-SYSTEMS - added at 27.11.2009
                if (stream.GetByteCount() > 10)
                {
                    dp = stream.CreateDataPacket();
                    if (((SNACFamily)dp.SNAC.FamilyServiceID) == SNACFamily.PrivacyManagementService)
                    {
                        PrivacyManagementService sub = (PrivacyManagementService)dp.SNAC.FamilySubtypeID;
                        if (sub == PrivacyManagementService.ServiceParametersRequest)
                        {
                            parent.OnError(ServerErrorCode.ExternalClientRequest, dp);
                        }
                    }
                }

                Logging.WriteString("Received close connection FLAP");
                DisconnectFromServer(false);
                return;

            case 0x05:     // Keepalive packet
                Logging.WriteString("Received keepalive FLAP");
                SendKeepalive(null);
                break;

            default:
                break;
            }

            // Shine on, you crazy connection
            keepAliveTimer.Change(60000, Timeout.Infinite);
            ReadHeader();
        }