Re: Q: how to create a simple agent deals with scalars

Thanks for your answers.

I only have rocommunity public and rwcommunity public in my snmpd.conf
file. There are no other access control settings. Could this be a problem?

My initScalar(void) is simply a copy of the example code, init_scalar_int
which has a static variable and an oid instance defined. Then I call
netsnmp_register_int_instance with a NULL sub-handler function.
Practically, I don't think this implementation should work either. Because
1. I see no reason my initScalar() can get called by the snmpd daemon. I
mean the method initScalar() has no references.
2. I thought I should write something in my initScalar() to switch from
one request mode to another in order to handle different requests
(set/get/get next...) and I didn't then how could snmpd tell which
operation it should execute when it receives a corresponding request?

/Pan


> On 20/12/2007, Xuan Pan <[email protected]> wrote:
>> I wrote an extension agent that deals with a single integer object
>> defined
>> in my MIB file by referencing the sample of scalar_int.c
>> (http://www.net-snmp.org/dev/agent/scalar__int_8c-example.html)
>>
>> The problem is I keep getting the error, "(noSuchName) There is no such
>> variable name in the MIB" when getting the value from this variable or
>> setting the value for it. The fact is the variable does exist in the MIB
>> file and I have assigned the read-write access right to it. Can anyone
>> tell me the reason for this?
>
> There are two likely causes:
>
>   a)  The registration of this module doesn't use the OID(s) that you
> expect.
>   b)  The access control settings of the agent don't allow access to this
> OID.
>
> Can you see other MIB objects in the general vicinity of your scalar?
> That would tend to show whether the access control is correct or not.
>
> For the first option, we'd probably need to see the init_xxx() routine
> from your module, together with the exact command(s) that you are
> using to query the agent.
>
> Dave
>



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