On May 15, 2006, at 10:12 AM, Lennart Poettering wrote:
On Fri, 14.04.06 18:00, [EMAIL PROTECTED] ([EMAIL PROTECTED]
) wrote:
I just wrote this up to hopefully get some consistancy from
which to work from for a bittorrent zeroconf
protocol.
I would like to ask for some constuctive criticism and any
commentry from people as to how well it is
likely to work.
Sorry for the delayed response!
A few comments:
First I must say, that I wonder if it is a good idea to generate
service types dynamically.
DNS-SD service types have a very strict form: "_foo._tcp" or
"_foo._udp" - with exactly two labels. DNS subtypes have the form
"_waldo._sub._foo._tcp". You should follow this rule for your service
types and subtypes.
I agree that the service type part should not be generated
dynamically, however, the subtype part "_waldo", is free to be
generated dynamically.
Is the peer-id really necessary in the service name or type? Otherwise
i would drop it, naming the service after the local hostname,
perhpas in a form like distcc does it: "[EMAIL PROTECTED]".
Service names should be human readable, and should not be used to
store binary information intended to be read by computers only.
It's true that most of the time service names are human readable, but
it's totally possible that you could invent a protocol that doesn't
require users to see the service name, and in that case, the service
name could be anything you want.
Hence my suggestions:
The main service should bear a name like:
[EMAIL PROTECTED]
and a type of
_bittorrent._tcp
The subservice for the bt hash
32f17bbf96bdc77de85bb91ff8d56f124e817c0a should be:
_32f17bbf96bdc77de85bb91ff8d56f124e817c0a._sub._bittorrent._tcp
You may include the peer-id in the TXT records if you think that makes
sense.
If it's possible to avoid using the TXT record, it would be better,
but the TXT record could be used for this if necessary.
AFAIK Bonjour doesn't support adding more than a single subtype to a
service. Avahi doesn't have this limitation
You can register many subtypes using Bonjour by passing them in as
comma separated strings, like this...
"_foobar._tcp,_subtype1,_subtype2,_subtype3"
Best Regards,
-Marc
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