Re: A primary OID handler for a whole subtree

On 7 September 2012 12:38, Sverre Moe <[email protected]> wrote:
> Yes it is a group of scalar. In my little example it is only one group, but
> it can potentially be many groups. There will never be other groups in a
> group that has scalars, but one group can have 2 group of scalars.
>
> For example it could be something like this. Can all these scalar be counted
> in the main group of test, or the groups of test1, test2, test31 and test32?

No - you would need to register each group individually.

Remember - there must always be something within the code that
implements a given MIB that tells the agent which OIDs correspond
to valid MIB objects.
   In the case of the scalar_group helper, the code takes the "root"
OID, and appends each of the subidentifiers from within the range
given in the registration.
   So
        netsnmp_register_scalar_group(  "root", first, last );

 is a shorthand for
             register  root.first
             register  root.first+1
                  :
             register  root.last


There's not really an easy way to tell the agent

             register  root.group1.obj1
             register  root.group1.obj2
                  :
             register  root.group1.objN
             register  root.group2.obj1
             register  root.group2.obj2
                  :
             register  root.group2.objM
             register  root.group3.group3a.obj1
             register  root.group3.group3a.obj2
                  :
             register  root.group3.group3a.objX
             register  root.group3.group3b.obj1
             register  root.group3.group3b.obj2
                  :
             register  root.group3.group3b.objY

How would you go about specifying this level
of complexity within a single
     netsnmp_register_complex( ... )
              call?

(Let alone the rats' nest of code that would be
 needed to process such a registration).
It's a lot easier to have a registration helper for
a simple group, and let the initialisation code
take care of the heirarchical complexities:

    netsnmp_register_scalar_group( root.group1, 1, M );
    netsnmp_register_scalar_group( root.group2, 1, N );
    netsnmp_register_scalar_group( root.group3.group3a, 1, X );
    netsnmp_register_scalar_group( root.group3.group3b, 1, Y );

Dave

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