[gnutls-devel] GnuTLS | msmtp unable to send mail with gnutls 3.6.5. TLS1.3 issue? (#644)

[Development of GNU's TLS library]

I just had to rewrite my own code for this reason.

With TLS 1.3, gnutls will return GNUTLS_E_AGAIN even if the underlying transport socket is a blocking socket. I'm pretty sure that previously GNUTLS_E_AGAIN was getting returned only with non-blocking sockets as the underlying transport, when reading or writing to the socket came back with EAGAIN. GNUTLS_E_AGAIN was, basically, a passthrough for EAGAIN on the underlying socket.

All existing code that uses blocking sockets most likely handles any -1 return from gnutls_record_send(), gnutls_record_recv(), and gnutls_handshake() as a fatal transport error. It doesn't know about special meaning of GNUTLS_E_AGAIN, because it was only seen, up until now, with non-blocking sockets.

Existing code that uses non-blocking sockets is unlikely to be affected, as it already understands GNUTLS_E_AGAIN.

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