Data remains in SslStream after read

Question

I'm developing a peer-to-peer software, that uses .net's SslStream for secure communication.

I use BeginRead() and EndRead() to read the data from the stream asynchronously. (Don't mind the weird callback method too much.. it's from a framework I have to work with right now)

while(Config.State < Config.State.Exit)
{

    association.SslStream.BeginRead(
                InputBuffer,
                InputBufferOffset,
                InputBuffer.Length - InputBufferOffset,
                iarPort.Post,
                null);

    yield return Arbiter.Receive(false, iarPort, iar =>
            {
                try
                {
                    bytesReceived = association.SslStream.EndRead(iar);
                }
                catch
                {
                    bytesReceived = 0;
                }
            });

// process data

}

The client will process the received data and start reading again. If the remote client has not sent new data yet, the receiving client will read the old data again. So the data remains in the SslStream after it was read.

Is there a way to tell the client that he has already read this data?

score 1 · Accepted Answer · answered Sep 03 '13 at 11:52

The data does not remain in the stream after it was read. If it was that would be a severe bug. That is so unlikely that I'd rather look at my own code first.

You are probably misusing the stream in some way. Maybe you are seeing old data in the byte[] buffer because your code does not respect the bytesReceived value. Or there was an error, which you suppressed in the catch clause. Maybe you just did not notice the error.

If I did not guess the bug (had to guess because there is not enough information here to find it) then you should probably use the debugger to step through your problem and find out what's wrong.

Thanks, I did not think of that. First what comes in mind is that the buffer is not cleared after the data is processed. So the EndRead method might return 0, but the still filled buffer is used again. I will check that. — PogoMips, Sep 03 '13 at 11:58

Data remains in SslStream after read

1 Answers1