Re: Strange error in test program...

On 08/04/2008, Kris van Rens <krisvanrens.list@gmail.com> wrote:
> size_t if_oid_len = MAX_OID_LEN;
> read_objid("IF-MIB::ifNumber.0", if_oid, &if_oid_len);

Remember that this sets the value of 'if_oid_len' to be the actual
length of the OID for 'ifNumber.0' (i.e. 10)


> for (i = 0; i < num_if; i++) {
> sprintf(oid_str, "IF-MIB::ifPhysAddress.%d", i+1);

if_oid_len still has the value 10, so there isn't room in the
'if_oid' buffer to hold the OID for the ifPhysAddress instances.
(Well, actually there is, but 'read_objid()' thinks there isn't).

Try resetting if_oid_len to be MAX_OID_LEN before each
call to read_objid()'

> read_objid(oid_str, if_oid, &if_oid_len);
> snmp_add_null_var(req, if_oid, if_oid_len);
> }



You are also assuming that ifTable entries will always be
in a strict consecutive sequence (starting from 1). That's
probably true for most simple systems, but it's not guaranteed.
It is perfectly valid to have 3 interfaces, with indexes 2, 3
and 27, for example.

You might want to look at using a sequence of GETNEXT requests,
or (if your agent supports SNMPv2c or SNMPv3), a GETBULK
request, which would do the same thing but in one go.

Dave

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