[gnutls-help] DTLS and gnutls_bye

Nikos Mavrogiannopoulos nmav at gnutls.org
Thu Feb 16 05:18:06 CET 2017

On Tue, 2017-02-14 at 18:07 -0800, Sean Greenslade wrote:

> > > Specifically, the behavior I'm seeing is this. gnutls_bye does
> > > send the
> > > close alert message over the wire, however the receiving end does
> > > not
> > > raise an alert error when checking for received packets.
> > 
> > What does the other side receive?
> When the close alert packet gets sent from the client to the server,
> I
> can see it on the wire (encrypted, of course). The server has a
> multiplexer function that handles multiple clients simultaneously,
> and
> it sees a packet from the client and calls gnutls_record_recv() to
> process it. gnutls_record_recv() returns zero, apparently ignoring
> the
> alert flag while consuming the packet.

Returning zero is the expected behavior (EOF) from gnutls_record_recv,
when the closure alert is received.


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