Re: DNS based service discovery script

[David Fifield <david () bamsoftware com>]

On Sun, Oct 04, 2009 at 10:09:03PM +0100, Duarte Silva wrote:
> Hi Raqvipriya,
>
> That doesn't seem to me as a valid DNS request. I think you should try
> to use the nmap NSE DNS library.
>
> require "dns"
>
> action = function(host, port)
>     dns.query("_services._dns-sd._tcp.local", {host = host.ip, port =
> port.number, dtype = 1})
> end
>
> Don't know if it will work but its worth the shot.

Yes, it will have to be something like that. The dns library will take
care of encoding the query and decoding the reply. I recommend that you
use Wireshark (http://www.wireshark.org/) to capture the traffic from a
program that makes these requests, then adjust your script until it
makes the same queries. On Mac OS X you can use the dns-sd tool. There
is probably a similar tool that comes with Avahi (http://avahi.org/).

David Fifield

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