It seems that if I set up the notification mib to have a
notifyFilterTable entry that specifies oid .1 with a mask of
0xffffffffffffffffff and a type of include that this should enable all
traps that are not specifically excluded to be sent. I should then be
able to set specific trap oids with a type of exclude to filter only
those specific traps. In practice, on 5.3 I see that all traps get
excluded. I believe this is related to the snmplib/vacm.c code which is
the same in 5.4.
I captured the code from vacm.c that I think is causing the problem and
highlighted the particular conditional that I think results in the
excluded oid overriding the include statement. My interpretation is
that since the oid in the vacm filter is longer then the previous vpret
that it causes the excluded oid to override the include oid. My
assertion is that this is incorrect because I believe that only up to
the common oids should be checked.
Is this a bug?
if (mode == VACM_MODE_CHECK_SUBTREE) {
vpret = vp;
} else if (vpret == NULL
/**** the following line includes oids that should not necessarily
be included ****/
|| vp->viewSubtreeLen > vpret->viewSubtreeLen
/**** the above line is the line that I think is in error *****/
|| (vp->viewSubtreeLen == vpret->viewSubtreeLen
&& snmp_oid_compare(vp->viewSubtree + 1,
vp->viewSubtreeLen - 1,
vpret->viewSubtree + 1,
vpret->viewSubtreeLen - 1) >
0)) {
vpret = vp;
}
Jeff
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