Re: how to write a handler reacting on requests under the registered mib?

On 10/08/07, Torben Surmer <[email protected]> wrote:
>  I have generated some example code with mib2c -c mib2c.create-dataset.conf
> NET-SNMP-EXAMPLES-MIB::netSnmpIETFWGTable
>
>  After compiling a subagent with the code generated by mib2c I assumed that
> the handler-function would be called when I run a snmpget on a MIB under the
> registerd OID {1,3,6,1,4,1,8072,2,2,1}, thus something like %snmpget
> localhost .1.3.6.1.4.1.8072.2.2.1.4711 ... I was mistaken, but to my
> surprise the handler IS called when I do %snmpget localhost
> .1.3.6.1.4.1.8072.2.2.1.1.3.1 !
>
>  Mysterious. Do anybody know why?

The basic idea of the 'dataset' helper is that the table contents are
maintained by the helper itself.   It knows which rows are valid,
and which rows are not.

When the agent receives a GET request for a valid row, it will
retrieve the corresponding column value, insert this into the
response varbind, and then call the user-provided handler for
any last-minute processing that might be required.

When the agent receives a GET request for a non-existant
row, it recognises that the row is not valid, so returns a
'noSuchInstance' exception automatically.   It doesn't call
the user-provided handler, because it knows that the row
doesn't exist.


If you want to take care of which rows are/aren't valid yourself,
then don't use the 'dataset' helper.  It's not designed for that.

Dave

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