Handshake has failed (Resource temporarily unavailable, try again.)

[Andrew]

hi,

I'm seeing quite a few of these messages on the server:
Handshake has failed (Resource temporarily unavailable, try again.)

That seems to be caused by gnutls_handshake() returning
GNUTLS_E_AGAIN.

According to gnutls_handshake() man-page (http://www.manpagez.com/man/
3/gnutls_handshake/)
"The non-fatal errors such as GNUTLS_E_AGAIN and
GNUTLS_E_INTERRUPTED
interrupt the handshake procedure, which should be resumed later.
Call
this function again, until it returns 0".

And some other example code:
http://pits.googlecode.com/svn/trunk/ssl_gnutls.c
https://lists.exim.org/lurker/message/20120518.031702.88801b20.da.html
http://www.opensource.apple.com/source/curl/curl-57/curl/lib/gtls.c

So I think onion_prepare_gnutls_session() should be checking for
GNUTLS_E_AGAIN and just call gnutls_handshake() again.


Regards,
Andrew Victor

[David Moreno Montero]

Hi,

sorry for the delay on response, I've been busy this week.

I saw many of those, specially when using Chrome, but finally it manages to connect. I added the control code to trunk, but still gives me the errors, although on Chrome, they are slightly different to what you reported. I get "Handshake has failed (A TLS packet with unexpected length was received.)". 

Anyway, it now retries (at most 10 times) as recomended in the GNU TLS server example (http://www.gnu.org/software/gnutls/manual/html_node/Echo-server-with-X_002e509-authentication.html#Echo-server-with-X_002e509-authentication).

I'm working also on a refactoring of this part to allow several listen points (ports, with diferent protocols) on a separate branch (published at github as multiport). In this reimplementation of HTTPS support it already had this handshake retry.

Thanks for your reports,

David

2012/6/27 Andrew <avict...@gmail.com>

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