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Re: [WIP] DTLS 1.0 preliminary patches

From: Simon Josefsson
Subject: Re: [WIP] DTLS 1.0 preliminary patches
Date: Wed, 29 Jul 2009 21:16:37 +0200
User-agent: Gnus/5.110011 (No Gnus v0.11) Emacs/23.0.96 (gnu/linux)

Jonathan Bastien-Filiatrault <address@hidden> writes:

> Nikos Mavrogiannopoulos wrote:
>>> I was thinking more of a set_transport in the long run with a DGRAM or
>>> STREAM argument and with a transport protocol selector for UDP, SCTP,
>>> DCCP and UDP-Lite. I guess gnutls_init_dtls could take those arguments
>>> instead.
>> You mean for setting different push/pull functions? Those could be in
>> predefined macros that are explicitly called.
> I was referring to DTLS over DCCP and SCTP having specific quirks (and
> specs, RFC5238 and draft-ietf-tsvwg-dtls-for-sctp-01). DTLS needs a
> way to be told it is using something other than UDP.

Ouch, I see.   How about something like this:

  typedef enum {
  } gnutls_dtls_flags_t;

  int gnutls_init_dtls (gnutls_session_t * session,
                        gnutls_connection_end_t con_end,
                        gnutls_dtls_flags_t flags);

A "flags" concept is somewhat more generic since it allows for other
DTLS-flavors than just those influenced by the transport.

Another alternative is to use a priority string but I'm not sure it will
work -- there is the ordering of API calls problem I mentioned earlier.


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