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<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
commented:
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<p dir="auto">Hi Michael. There is no such function to check for a closed session, as a session can close only explicitly (bye), or by a fatal error during send or recv. Going through the log again I think I see a more detailed pattern:</p>
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<li>
<code>gnutls_session_get_data2()</code> is called</li>
<li>error is printed: <code>GTLS: The pull function has been replaced but not the pull timeout</code>
</li>
<li>send is called and it considers the session as closed</li>
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<p dir="auto">So it must be (2) that causes the error. A change in TLS1.3 was that a session ticket arrives asynchronously, and that's why session_get_data2(), now tries to read with a timeout. That the pull timeout was not required before except for DTLS and in the case you were using a receiving function that explicitly set a timeout. As many applications set <code>gnutls_transport_set_pull_timeout_function</code> anyway, an issue like that may not have been noticed. Could that be the case here? (does glib-networking set the pull timeout?)</p>
<p dir="auto">If it is not calling it what we can do in gnutls is make sure that <code>gnutls_session_get_data2()</code> does not require a timeout if a callback is not set instead of invalidating the session. A better fix would be to set the callback of course.</p>
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