Commits on Mar 19, 2024

1. dnssd.c: Enable service registration on loopback …

   In case users would like to prevent sharing services from printer
   applications to local network, restrict it to localhost and let CUPS do
   the sharing.
   
   This can be done by setting `listen-hostname` in PAPPL API - this
   prevents accessing the public addresses, but the service is still
   published on those public addresses.
   
   The PR does the following:
   
   - update system hostname internally in `papplAddListeners()`
   - dnssd functions will check system hostname and if it is localhost, it
     will use loopback index
   - in case of Avahi it passes NULL as hostname to let Avahi decide what
     hostname to use (in case of hostname conflicts)
   
   The result is that if system hostname is set to localhost internally, the service is
   published on `.local` address, but resolved to loopback because CUPS
   uses DNS-SD names in URIs.

   

   zdohnal committed Mar 19, 2024
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