Re: 5.4 perl - missing indices in bulkwalk result

Hi Dave,

I just wanted to give you feedback that tweaking the code in the way you 
suggested now sets the Error correctly in the SNMP session object.

This way I can work around the the misbehaving agents manually, althought I 
would be very happy, if net-snmp could be more fault tolerant, so I do not 
need any dirty hacks in my code.

Thanks a lot for your quick help!

Florian

Am Donnerstag, 5. April 2007 17:40 schrieb Dave Shield:
> On 05/04/07, Florian Jauernig <[email protected]> wrote:
> > > Note that the SNMP perl module does include a flag to control the
> > > behaviour when such bogus results are returned:
> >
> > I already tried this - but unfortunately when creating session objects
> > using "new" with the "NonIncreasing" key set to 1, I do not get any
> > errors in the session object.
>
> Hmmm....
>
> I've never actually used this flag (and it's a bit difficult to trigger).
> But comparing the code in SNMP.xs with the equivalent code in
> apps/snmpbulkwalk,  I can see a suspicious difference:
>
> SNMP.xs:
>          if (__oid_cmp(vars->name, vars->name_length,
>                                    context->reqbase[pix].last_oid,
>                                    context->reqbase[pix].last_len) == 0) 
> { if (check) {
>                DBPRT(2, (DBOUT "Error: OID not increasing: %s\n",
>                // etc
>             }
>        }
>
> snmpbulkwalk.c:
>           if (check && snmp_oid_compare(name, name_length,
>                                                 vars->name,
>                                                 vars->name_length) >= 0)
> { fprintf(stderr, "Error: OID not increasing: "); // etc
>            }
>
>
> The command-line tool picks up on anything other than
> strictly increasing OIDs.   The perl module only spots
> a repeasted OID (so wouldn't recognise your situation,
> where the OID actually goes backwards).
>
>
> Try tweaking the SNMP.xs code to use the test   "<="  instead of "==",
> (since the two OIDs are presented in the opposite order!)
> recompile, and re-install.   Does that make any difference?
>
> Dave

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