[lwip-devel] [task #15104] DNS: Support look-up of other RR types

[Craig McQueen]

URL:
  <https://savannah.nongnu.org/task/?15104>

                 Summary: DNS: Support look-up of other RR types
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: cmcqueen1975
            Submitted on: Wed 05 Dec 2018 02:31:20 AM UTC
                Category: None
         Should Start On: Wed 05 Dec 2018 12:00:00 AM UTC
   Should be Finished on: Wed 05 Dec 2018 12:00:00 AM UTC
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
                  Effort: 0.00

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Details:

Goals:

* Allow look-up of other DNS Resource Record (RR) types such as PTR, SRV, TXT,
MX.
* Allow reverse lookups (e.g. to get the host name associated with
192.168.1.2, do a PTR look-up of 2.1.168.192.in-addr.arpa.).
* For Zeroconf, allow mDNS look-up of DNS-SD advertisements. That requires
look-up of PTR, SRV and TXT records.

Considerations, complications:

* Multiple answers (many RR responses can include multiple answers, and the
client needs to process all of them).
* Multiple responses (in the case of mDNS look-ups of DNS-SD advertisements,
there can be an unbounded number of responses from multiple network devices).
* Caching. A lot more complicated than the current case of a hostname
resolving to a single IP address.




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