[Users] [Bug 3139] Main window totally unresponsive due to a busy loop

[noreply at thewildbeast.co.uk]

http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=3139

Colin Leroy <colin at colino.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #8 from Colin Leroy <colin at colino.net> ---
(In reply to comment #5)

> The mail server is public: cba.pl
> You're right, it's enough to configure an account in claws-mail using
> cba.pl, TLS on, "test" username to reproduce the problem (I have just
> verified it).
>
> Anyway, as you confirmed, busy loop is a problem, so I'd appreciate if you
> could investigate it...

Thanks for the server's name, it helped. Adding a bit of debugging showed that
gnutls_record_recv() returns GNUTLS_E_UNEXPECTED_PACKET.

I don't know how to recover from that, but in case of unexpected results from
gnutls_record_recv(), I missed setting errno to a fatal error so that the
connection would be dropped. 

As it was previously set to EAGAIN by network read code, and
gnutls_record_recv() does not set it, it was stuck in an infinite loop.


For the record, gnutls-cli -starttls -p 110 cba.pl fails with:
*** Fatal error: An unexpected TLS packet was received.
*** Server has terminated the connection abnormally.

And openssl s_client -starttls pop3 -host cba.pl -port 110 fails with:
140066369763008:error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version
number:s3_pkt.c:337:

I'll mark the bug fixed as we didn't catch the error, but I guess I can't fix
the error itself :)

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