[lwip-devel] [bug #55024] mDNS: does not respond to probes via multicast

[Jasper Verschueren]

URL:
  <https://savannah.nongnu.org/bugs/?55024>

                 Summary: mDNS: does not respond to probes via multicast
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: jasperv
            Submitted on: Wed 14 Nov 2018 04:48:56 PM CET
                Category: apps
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: git head

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Details:

The mDNS responder only responds to a probe query via unicast because
according to the RFC, a probe should have the QU bit on.
At the moment the QU bit is ignored and a probe is always answered via unicast
(is easier, no multicast timeout issues). 
After more testing we found that not all implementations follow the RFC's
should (avahi-daemon for example). Avahi sends it's probe messages with the QM
flag. This can easily be seen when publishing a service via avahi-publish.

This commit adds support for multicast probe answering with the needed
timeouts etc. 



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File Attachments:


-------------------------------------------------------
Date: Wed 14 Nov 2018 04:48:56 PM CET  Name:
0001-mDNS-respond-to-probe-via-multicast-added.patch  Size: 19KiB   By:
jasperv

<http://savannah.nongnu.org/bugs/download.php?file_id=45423>

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