[Bug 1736757] [NEW] [PATCH] Avahi does not support local-only services via the loopback interface

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Till Kamppeter (till-kamppeter):

To allow the more sophisticated functionality of IPP network printers (web admin interface, query printer capabilities and job status from printer) also on USB printers, newer USB printers support the IPP-over-USB standard which is supported under Linux via the ippusbxd package from OpenPrinting. The ippusbxd daemon connects to the USB printer and mirrors it into a virtual IPP network printer on localhost, port 60000.
CUPS and cups-browsed find IPP printers by the printer's DNS-SD broadcasts. On Linux systems avahi-daemon is handling the registration of local services and also the discovery of remote services. This works well with local services shared to the network as Avahi does appropriate broadcasts on network interfaces (eth0, wlan0, ...) but Avahi does not handle the loopback device lo for local services ("localhost"). So the local-only IPP-over-USB printer on localhost:60000, registered by ippusbxd does not get advertised, not even locally.
The attached patchfor the Ubuntu package of Avahi adds support for such services.
See also the upstream bug report https://github.com/lathiat/avahi/issues/125

** Affects: avahi (Ubuntu)
     Importance: High
         Status: New


** Tags: patch
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[PATCH] Avahi does not support local-only services via the loopback interface
https://bugs.launchpad.net/bugs/1736757
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