[AGENT++] Intercept and manipulate PDU question.....

[alexander link]

Hi Frank,

I think you're right.
Can you give a hint on how to check for the (possible) second sub-request.
I know that protocol specification allows this operation but I simply do not know where to begin when using 
agent++ api.

Hi Alexander,

alexander link wrote:

>Hi all.
>
>Situation:
>I would like to set the value of one MIB object (e.g. objectA ) only if the value of another object (e.g. 
objectB) 
>matches a certain condition.
>
>Problem:
>Is there any possiblity to intercept and manipulate the received PDU without diving into the agent++ api? 
Can I 
>  
>
Yes of course, but I would not call it intereception. If value of 
objectA is to be changed,
then simply check value of objectB by overwriting the 
objectA::prepare_set_request method.
If objectB is allowed to be set in the same request, you will also have 
to check if there is a value
in the Request in another sub-request set for that objectB.

>furthermore introduce a new (private) return error which can be applied to the response PDU? This could be 
>  
>
Yes, you can return any error code you want, but that's no longer SNMP then.
I would rather (strongly) recommend using inconsistentValue instead as 
error code.

>useful because I could let the NMS know that some condition does not allow to set the value of a MIB object.
>
>Maybe there is something about SNMP I have not clearly understood.
>Please let me know.
>
>Regards
>Alexander Link
>  
>

Best regards,
Frank

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