mdnsd

mdnsd

Runs on:

QNX Neutrino

Options:

-d

Run mdnsd as a foreground process and enable debug mode.

-e

Run in enterprise mode. For internal use only.

-f

Run mdnsd as a foreground process, instead of as a daemon.

-logging

Enable additional debug logging.

-U uid[:gid]

Set the user ID and group ID to run as.

Description:

The mdnsd daemon (also known as mDNSResponder on some systems) is a daemon invoked at boot time to implement Multicast DNS and DNS Service Discovery.

The mdnsd daemon listens on UDP port 5353 for Multicast DNS Query packets. When it receives a query for which it knows an answer, mdnsd issues the appropriate Multicast DNS Reply packet.

It also performs Unicast and Multicast DNS Queries on behalf of client processes, and maintains a cache of the replies.

Logging

There are several methods that you can use to examine mdnsd's internal state for debugging and diagnostic purposes. The syslogd logging levels map as follows:

• Error: error messages
• Warning: client-initiated operations
• Notice: sleep proxy operations
• Info: informational messages

By default, only log level Error is logged.

A SIGUSR1 logs the current state information.

slay -s SIGUSR1 mdnsd

A SIGUSR2 signal toggles additional logging and packet logging:

slay -s SIGUSR2 mdnsd

For more information on:

• Multicast DNS, see http://www.multicastdns.org/.
• DNS Service Discovery, see http://www.dns-sd.org/.
• how to use the Multicast DNS and the DNS Service Discovery APIs on Mac OS X and other platforms, see http://developer.apple.com/bonjour/.

For the source code to mdnsd, see http://developer.apple.com/darwin/projects/bonjour/.