[sr #107929] gnutls_record_get_direction() can return the wrong direction after an interrupted gnutls_record_send()

[anonymous]

URL:
  <http://savannah.gnu.org/support/?107929>

                 Summary: gnutls_record_get_direction() can return the wrong
direction after an interrupted gnutls_record_send()
                 Project: GnuTLS
            Submitted by: None
            Submitted on: Fri 06 Jan 2012 06:49:29 PM UTC
                Category: Core library
                Priority: 5 - Normal
                Severity: 4 - Important
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: philip.allison at smoothwall.net
             Open/Closed: Open
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

I have noticed some odd behaviour when moving an application from GnuTLS 2.10
to 3.0.  Specifically, when using non-blocking sockets,
gnutls_record_get_direction() can return 0 (i.e. read) after an interrupted
call to gnutls_record_send(), in cases where the peer isn't trying to send any
data.

Unless I change our server application code to ignore the return from
gnutls_record_get_direction() except during handshakes, and assume the
direction will always be 0 after an interrupted recv and 1 after an
interrupted send, data transfer between the client and server can hang with
both peers waiting for input.  The client is a web browser, Firefox, and so is
unlikely to be the culprit.

A very quick glance at the current HEAD of master (git grep
internals.direction) turns up no code where the direction is ever set to 1! 
The last code looking like "internals.direction = 1" was removed by commit
a209eced7ce4fc698d27d16e3403441b452d9c0e.




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