Re: Repeated SET requests failing

On 07/06/07, Ward Witt <[email protected]> wrote:
>  // SNMP-SET 1.3.6.1.4.1.6827.10.74.3.9.1.1.2 Int 2
>
>  Sending 30 bytes to UDP: [10.0.0.126]:161
>  0000: 30 1C 02 01  01 04 07 70  72 69 76 61  74 65 A3 0E
>  0016: 02 04 62 17  B9 1C 02 01  00 02 01 00  30 00
>
>  Received 30 bytes from UDP: [10.0.0.126]:161
>  0000: 30 1C 02 01  01 04 07 70  72 69 76 61  74 65 A2 0E
>  0016: 02 04 62 17  B9 1C 02 01  00 02 01 00  30 00

OK - that particular dump corresponds to a SET request
with no assignments included.   So it's not too suprising
that the update doesn't get applied.

That would tend to point the finger at the client-side code,
rather than the agent,

I've no experience with using Objective-C, so wouldn't
like to speculate as to how well the Net-SNMP library
integrates with such an environment.

But the thing that springs out immediately from your sample
code is:

        read_objid([objectIdString UTF8String], objectid, &length);
        struct snmp_pdu *pdu = snmp_pdu_create(SNMP_MSG_SET);
        char value = intVal + 0x30;
        snmp_add_var(pdu, objectid, length, 'i', &intVal);

you're not checking return codes.
Does the 'snmp_add_var' call succeed or not?
Does the 'read_objid' call succeed or not?

It's certainly worth checking these two - because if there are
any problems here, you will indeed end up with an empty
SET request.

Dave

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