[Olsr-dev] New plugin: DNSSD

Henning Rogge (spam-protected)
Fri Feb 15 15:24:03 CET 2013


is there something the p2pd plugin can do which this plugin cannot do?

Henning Rogge

On 02/15/2013 02:08 PM, Dan Staples wrote:
> Hi all, I have a new plugin for your consideration:
> The aim of the DNSSD (DNS Service Discovery) plugin is to control the
> propagation of mDNS service advertisements on an OLSR mesh. The plugin
> is based on the P2PD plugin code. Instead of forwarding mDNS traffic
> onto the mesh with a fixed TTL value, as P2PD does, DNSSD allows each
> local service to define it's own TTL value. For example, a service that
> has a TTL value of 3 will only be advertised a maximum of 3 hops away.
> This can be useful for services and applications that either want to
> remain local in scope (like a community bulletin board) or whose service
> quality degrades after so many hops (like streaming voice or media).
> The plugin works as follows:
> * DNSSD searches through Avahi service files in a directory specified by
> the "ServiceFileDir" config option.
> * Any service files in the directory containing a TTL txt-record field
> and a domain field matching the "Domain" config option (e.g.
> 'mesh.local') are added to a list of local services.
> * Just like the P2PD plugin, DNSSD listens on non-OLSR interfaces and
> forwards mDNS packets to the mesh, but with the following differences:
>      -- Any non-query Resource Records that describe any service in the
> list of local services are stripped out, and the remaining packet is
> forwarded with the default TTL value.
>      -- Resource records that were stripped out are sorted into bins
> according to the custom TTL values of the local services they describe.
>      -- Each bin of RRs is then put into a new mDNS packet, given a
> custom TTL value in the OLSR header, and then forwarded to the mesh.
> Let me know if you need any clarifications. I tested it on a local
> Commotion mesh and it seems to work fine. The code can be found here:
> https://github.com/danstaples/olsrd-dnssd. I'll be doing more testing
> soon on a larger mesh.

Diplom-Informatiker Henning Rogge , Fraunhofer-Institut für
Kommunikation, Informationsverarbeitung und Ergonomie FKIE
Kommunikationssysteme (KOM)
Fraunhofer Straße 20, 53343 Wachtberg, Germany
Telefon +49 228 9435-961,   Fax +49 228 9435 685
mailto:(spam-protected) http://www.fkie.fraunhofer.de

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