Re: [gupnp] UPNP compliance to M-SEARCH responses

[Stephen Depooter <stephend xandros com>]

On Monday 14 June 2010 04:47:17 pm Zeeshan Ali (Khattak) wrote:
> Hi,
>
> On Mon, Jun 14, 2010 at 11:21 PM, Stephen Depooter <stephend xandros com> 
wrote:
> > The UPNP device architecture specifies that the M-SEARCH responses MUST
> > not be sent to malformed M-SEARCH requests.
> >
> > Specifically,
> > "If there is an error with the search request (such as an invalid field
> > value in the MAN header field, a missing MX header field, or
> > other malformed content), the device MUST silently discard and ignore the
> > search request; sending of error responses is
> > PROHIBITED due to the possibility of packet storms if many devices send
> > an error response to the same request."
> >
> >
> > Would patches that mandate these requirements be acceptable? or would
> > that break any DLNA compliance?
>
>   No, I seriously doubt so. So please do provide a patch for this.
>
>  > My proposal would add a bunch of extra sanity checking and break the
>  > "liberal
> >
> > in what we accept, strict in what we send out" principal, however if
> > anyone else looks for UPNP certification using gssdp, they will also need
> > these changes.    In addition, the proposed changes would remove the
> > gssdp ability to fill in a default value for the MX header if it is
> > missing.
>
>  Although UPnP certification isn't as popular in the market as DLNA,
> it wouldn't harm to be compliant to both if possible. :)
>
> > In addition, since a passed UPNP certification appears to be a
> > requirement for the first step of DLNA certification, I suspect that this
> > will be necessary for DLNA as well.
>
>   Although your premise is wrong, your conclusion might be very much
> correct. :)

I got the impression of the requirement from the dlna certification FAQ where 
they talk about having to provide a UPNP certification ID as the first steps 
of the DLNA certification process.

Regardless of the requirement from the DLNA certification process, I will come 
up with a set of patches to tighten up the requirements for M-SEARCH request 
handling for UPNP compliance.



-- 
Stephen Depooter
<stephend xandros com>
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