[AGENT++] build_vb and too many variables

[Frank Fock]

Hello Jacek,

May be you can consider to upgrade to the latest SNMP++/AGENT++
which does no longer have a fixed upper limit for the VBs in
a PDU. Otherwise you may test the constant MAX_VBS defined in
config_snmp_pp.h

Best regards,
Frank

Jacek Poplawski wrote:
> Hello.
> 
> I am trying to fix GetBulk behaviour in our Agent.
> When GetBulk produces big response, with many variables, they may not 
> fit into PDU.
> For example: PDU size is 2048, and 100 variables won't fit it.
> 
>  From RFC 3416:
> 
>   While the maximum number of variable bindings in the Response-PDU is
>   bounded by N + (M * R), the response may be generated with a lesser
>   number of variable bindings (possibly zero) for either of three
>   reasons.
> 
>   (1)   If the size of the message encapsulating the Response-PDU
>         containing the requested number of variable bindings would be
>         greater than either a local constraint or the maximum message
>         size of the originator, then the response is generated with a
>         lesser number of variable bindings.  This lesser number is the
>         ordered set of variable bindings with some of the variable
>         bindings at the end of the set removed, such that the size of
>         the message encapsulating the Response-PDU is approximately
>         equal to but no greater than either a local constraint or the
>         maximum message size of the originator.  Note that the number
>         of variable bindings removed has no relationship to the values
>         of N, M, or R.
> 
> my question is how to do it in snmp++, because in function build_vb 
> (asn1.cpp) it just checks if variables fit buffer size, and if not - it 
> retuns an error!
> If I understand it correctly - correct behaviour is to put some 
> variables into responce and cut others.
> How to check how many variables will fit PDU?
> 
> 
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