Setting a timeout value for .service file

[petrivir]

Hi all,

I'm working on software for mesh networking that uses Avahi for service discovery.

I'm publishing the mesh stations in /etc/avahi/services/ with my own service type. The .service file is created when a user joins the network and deleted when user leaves from it.

The problem is that if user is disconnected from the network by - let's say unplugging the usb wlan adapter - the station still appears in the Avahi Discovery (and in the software) for too long. Is there a way to control the timeout when using .service files?

Thanks for your time,
Petri
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On 13/08/2009, at 11:03 PM, Petri Virkkala wrote:

> Hi all,
>
> I'm working on software for mesh networking that uses Avahi for  
> service discovery.
>
> I'm publishing the mesh stations in /etc/avahi/services/ with my own  
> service type. The .service file is created when a user joins the  
> network and deleted when user leaves from it.
>
> The problem is that if user is disconnected from the network by -  
> let's say unplugging the usb wlan adapter - the station still  
> appears in the Avahi Discovery (and in the software) for too long.  
> Is there a way to control the timeout when using .service files?
>
> Thanks for your time,
> Petri
> _______________________________________________
> avahi mailing list
> avahi@...
> http://lists.freedesktop.org/mailman/listinfo/avahi

The /etc/avahi/services file is only really a hack to allow daemons  
and programs that don't support Avahi to be able to at least somehow  
advertise that they are there.

If you are writing your own service, then you will be much better off  
interacting with Avahi through the shared library from within your  
daemon/app - that way additions, edits and removals of your service  
are thrown to the network immediately.

Rob


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[Lennart Poettering-8]

On Thu, 13.08.09 16:03, Petri Virkkala (petri.virkkala@...) wrote:

> Hi all,
>
> I'm working on software for mesh networking that uses Avahi for
> service discovery.
>
> I'm publishing the mesh stations in /etc/avahi/services/ with my own
> service type. The .service file is created when a user joins the
> network and deleted when user leaves from it.
>
> The problem is that if user is disconnected from the network by -
> let's say unplugging the usb wlan adapter - the station still
> appears in the Avahi Discovery (and in the software) for too
> long. Is there a way to control the timeout when using .service
> files?

Uh, dynamically dropping .service files into /etc/avahi/services/ is
really hackish, as Robin already pointed out.

The TTL can only be set in the lowest-level DNS RR registration C
API. If you need to fiddle with the TTL than you need to use
avahi_entry_group_add_record().

However, I am not sure that playing games with the TTL like this is
really a good idea anyway.

Lennart

--
Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net
http://0pointer.net/lennart/           GnuPG 0x1A015CC4
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