RFC for enablement of slpd on openbmc

[Rick Altherr]

Please make sure there is a distro feature for this that can be turned off
to remove SLP entirely from the image.

On Wed, Oct 19, 2016 at 10:49 AM, Ratan Gupta <ratagupt at linux.vnet.ibm.com>
wrote:

> Hi All,
>
>
> *Enabling SLP Server on openBMC*
>
> What is SLP
>
> =======
>
> Service Location Protocol (SLP) is a protocol that provides a framework to
> allow networking applications to discover the existence, location, and
> configuration of networked services in enterprise networks.
>
> openSLP is widely accepted in the industry
>
> What do we need to do?
>
> ==============
>
> 1) Bring SLP(OpenSLP) in image:- Write the bitbake recipe(didn't find the
> readily available bitbake recipe)
>
> 2) Configure the services through Settings daemon.
>
> 3) Write the .service file as it needs to start after network is up(after
> networkd-online.target)
>
> How to configure the services which needs to be registered with slpd
>
> ============================================
>
> Option 1:- settingsd
>
> Note: Gives the flexibility to change the configured services @ runtime.
> Do we require this functionality?
>
> Option 2:conf file for discovery services
>
> Note: During build time we can get the service info(service-name,port)
> from the existing infra(discoveryservice.bbclass)
>
> How to register the services
> ==================
>
> 1) Static Registration:- will not work as we need ip/host-name details
> which we don't have @build time.
>
> 2) Application(new DBUS app) will register the configured services to the
> slpd on startup.
>
> We need to provide the dynamic registration support on BMC as IP of BMC
> can change any time.  Registration of services with slpd takes the URL of
> the service which includes ip and port of the service which needs to be
> registered.
>
> Create a DBUS service application
>
> =====================
>
> 1) Once the service starts it registers the configured services with slpd.
>
> 2) listening on RTNETLINK event for ip change: raise a dbus signal(for the
> IP change)
>
>      if there is IP change then dereg the old service followed by  reg
> service as the ip has changed.
>
> Regards
> Ratan Gupta
>
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> openbmc at lists.ozlabs.org
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>
>
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