systemd-resolved + systemd-dnssd as mDNS provider

[spacekitteh]

I use systemd-resolved's inbuilt DNS-SD and mDNS support, as opposed to Avahi. It would be good to have that available as an option, as systemd-resolved's mDNS and Avahi on the same system interfere with each other.

Publishing services it quite straightforward; just drop a file into /run/systemd/dnssd: https://www.freedesktop.org/software/systemd/man/latest/systemd.dnssd.html

Alternatively, it can be done with a simple call over DBus: https://www.freedesktop.org/software/systemd/man/latest/org.freedesktop.resolve1.html. There is an inbuilt DBus client built into libsystemd, called sd-bus, in the header systemd/sd-bus.h.

See also https://systemd.io/WRITING_RESOLVER_CLIENTS/ and https://systemd.io/WRITING_NETWORK_CONFIGURATION_MANAGERS/