Re: Failed sending V3 traps with auth using snmpNotifyTable

On Thu, 25 Jan 2007, Dave Shield wrote:

> On 25/01/07, Michael Kirkham <mikek@muonics.com> wrote:
>> > [SNMP_FLAGS_DONT_PROBE] should work to prevent probing a trap-only
>> > target and postpone probing
>> > of inform targets until an inform is sent. It wouldn't (alone)
>> completely
>> > fix the issue of the traps being sent with the wrong Engine ID. If the
>> target
>> > has a TagList whose tags indicate both informs and traps are to be sent,
>> then
>> > it would still probe later and then use the Engine ID from the probe,
>> cached
>> > in the session, to send the trap.
>>
>> FYI - added some debugging output, and snmpv3_build() is indeed where the
>> Engine ID of the trap is getting set to that of the management station,
>> from the session, because it is not yet assigned in pdu->securityEngineID.
>
> Ummm...
> One possibility would certainly be to have two session fields in the
> snmpNotify{Mumble} structure.
> An alternative might be to explicitly set the pdu->securityEngineID
> in the PDU template when sending a trap.
>
> [Again, without looking at the code. Not sure how practical that would
> be in reality]

Sure, I think one of my suggestions for fixing it was to do that in
send_trap_to_sess(), since that's where the template pdu gets duplicated
prior to doing session-specific stuff to it. Maybe I should just submit a
patch that does that as a suggested solution. Only reason I didn't do so
is there are a bunch of feasible approaches to fixing it and I'm not sure
what would be most acceptable. :)

But, ah, what the heck: patch # 1644280 submitted. Works for me.

--
Michael Kirkham
President & CEO
Muonics, Inc.
http://www.muonics.com/


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