On 21 January 2013 20:20, Guillermo Veneranda <guillev...@gmail.com> wrote:
> Hi,
> I'm reading the files examples/netSnmpHostsTable* but I find these quite
> difficult to understand, This is going to take a while. Maybe I should try
> something easier that use subhandler function.
>
> Could you please show me a simple example of a subhandler function?
If you started by looking at the code in 'example/scalar_int.c'
then perhaps a sensible approach would be to look at a handler-based
version of that.
Try running the following command:
mib2c -c mib2c.scalar.conf
NET-SNMP-EXAMPLES-MIB::netSnmpExampleInteger
That will generate template code that is broadly equivalent to the
'example/scalar_int.c' module.
The main difference is that instead of GET/SETs being handled
automatically by an internal helper, the requests are passed to the
MIB handler routine (i.e. the generated code) for processing.
What I would suggest is that you start with a read-only version of the
above template - i.e. take the generated code, change
"HANDLER_CAN_RWRITE" to be "HANDLER_CAN_RONLY", and
delete the blocks MODE_SET_RESERVE1 through to MODE_SET_UNDO
Then add the declaration of 'example1' from example/scalar_int.c
and use this value to fill in the MODE_GET block.
Compiling that into the agent (*instead* of example/scalar_int)
should allow you to query the same OID as before.
Then amend the code of the MODE_GET block so that instead of
returning a fixed value for 'example1', this value is read from a file.
(i.e. open the file, scan in a line, convert this line to a number,
and return that number - not forgetting to close the file again!)
That would give you the first part of what you were asking about.
(Handling GET requests from a file).
Try that - and come back when you've got it working, and we can
look at the SET processing.
Dave
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