[AGENT++] Possible bug in SET-response

[Frank Fock]

Hello Marcus,

This is indeed a bug. Although it has only "academic"
relevance, since a request generator should ignore
the value fields (see §4.2.4 of RFC3416) if the error
status is non zero.

I will provide a fix for it until end of this week.

Best regards,
Frank


Fehde, Marcus wrote:
> Hi,
> 
> I think I might have find a minor bug regarding SET-request processing in case of an error.
> 
> Situation:
> A SET-request results in an error, for instance, a notWritable-error that is included in the SET-response PDU. The fields errorStatus and errorIndex are set accordingly. But the variable bindings of the response PDU are set to NULL values. Accordingly to RFC3416 §4.2.5, the SET-response PDU shall keep the variable bindings of the original request.
> 
> Investigation:
> The processing of the SET-request ends with the invocation of Mib::finalize which further invokes RequestList::answer. While executing this method the method RequestList::null_vbs gets invoked. This is pretty good for any GET-request type (also accordingly to RFC3416), but it isn't for a SET-request.
> I modified the RequestList::answer in order to skip this method invocation for a SET-PDU. But I'm unable to appraise for any side-effects on this modification.
> 
> However, do you agree on my interpretation of RFC3416?
> 
> Regards,
> Marcus
> 
>  
> 
> Marcus Fehde
> R&D Business Unit Perioperative Care
> S30 Module Project Leader
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> E-mail: marcus.fehde at draeger.com
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