[WIP] DTLS 1.0 preliminary patches

[Simon Josefsson]

Jonathan Bastien-Filiatrault <joe at x2a.org> 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_OVER_DCCP
  } 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.

/Simon