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Does Socket.AcceptAsync throw SocketException for any transient reason?

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I'm writing exception handling around a call to Socket.AcceptAsync in a loop. One of the exceptions it's documented to throw is SocketException, but the documentation is vague:

An error occurred when attempting to access the socket.

I want to know if AcceptAsync throws SocketException for any transient reason. In particular, is there anything the remote client could do to cause it to throw? If I don't account for this, my program could be subject to denial of service attacks.

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1 answer

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The source code for the Socket.AcceptAsync class seems to be this one.

The relevant code (the one related to exceptions being raised) is the following:

private bool AcceptAsync(SocketAsyncEventArgs e, CancellationToken cancellationToken)
{
	ThrowIfDisposed();

	ArgumentNullException.ThrowIfNull(e);
	if (e.HasMultipleBuffers)
	{
		throw new ArgumentException(SR.net_multibuffernotsupported, nameof(e));
	}
	if (_rightEndPoint == null)
	{
		throw new InvalidOperationException(SR.net_sockets_mustbind);
	}
	if (!_isListening)
	{
		throw new InvalidOperationException(SR.net_sockets_mustlisten);
	}

	SocketError socketError;
	try
	{
		socketError = e.DoOperationAccept(this, _handle, acceptHandle, cancellationToken);
	}
	catch (Exception ex)
	{
		SocketsTelemetry.Log.AfterAccept(SocketError.Interrupted, ex.Message);

		// Clear in-use flag on event args object.
		e.Complete();
		throw;
	}

	return socketError == SocketError.IOPending;
}

Based on this, I would consider handling the following exception types:

  • ObjectDisposedException
  • ArgumentNullException
  • InvalidOperationException
  • Exception (that is, even the library creators expect "other" exception types)
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1 comment thread

Thanks for the code. The decompiler in VS was leading me in circles. But this doesn't quite resolve m... (1 comment)

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