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.Dd Jan 4 2022
.Dt MDNSD 8 SMM
.Os
.Sh NAME
.Nm mdnsd
.Nd small multicast DNS daemon
.Sh SYNOPSIS
.Nm mdnsd
.Op Fl hnsv
.Op Fl i Ar IFACE
.Op Fl l Ar LEVEL
.Op Fl t Ar TTL
.Op Ar PATH
.Sh DESCRIPTION
.Nm
is a small mDNS-SD daemon for UNIX like systems.  It is based on an
original implementation made by Jeremie Miller in 2003.  Multicast DNS
with service discovery (-SD) is an open standard defined in RFC5762,
mDNS-SD in RFC6763, commonly known to end-users as Bonjour or Avahi,
depending on the operating system.
.Pp
.Nm
reads service definitions of services to announce from
.Pa /etc/mdns.d/*.service ,
a different path may be given on the command line, which can be a
directory or a single service file.
.Pp
.Nm
by default runs on all multicast capable interfaces on a system.  Use
.Fl i Ar IFACE
to only run on a single interface.
.Sh OPTIONS
This program follows the usual UNIX command line syntax. The options are
as follows:
.Bl -tag
.It Fl h
Print a help message and exit.
.It Fl i Ar IFACE
Interface to announce services on.  By default
.Nm
runs on all interfaces.
.Pp
Only available on Linux.
.It Fl l Ar LEVEL
Set log level: none, err, notice (default), info, debug.
.It Fl n
Run in foreground, do not detach from controlling terminal.
.It Fl s
Use syslog even if running in foreground.
.It Fl t Ar TTL
Set TTL of mDNS packets, default: 1 (link-local only).
.It Fl v
Show program version.
.El
.Sh FILES
.Bl -tag -width /etc/mdns.d/*.service -compact
.It Pa /etc/mdns.d/*.service
mDNS-SD services to announce.
.El
.Sh SEE ALSO
.Xr mquery 1 ,
.Xr mdnsd.service 5 ,
.Xr mdns-scan 1
.Sh AUTHORS
This mDNS-SD implementation was created in 2003 by
.An Jeremie Miller Aq jer@jabber.org .
Much later, in 2016, it was adopted by
.An Joachim Wiberg Aq troglobit@gmail.com
for further development and maintenance at GitHub:
.Aq https://github.com/troglobit/mdnsd .