Re: [lwip-users] SNMPv3 TRAPS

[Indan Zupancic]

Hello Luca,

On 2022-12-02 18:38, Luca Ussoli wrote:
> Using the master branch I managed to get the SNMPv3 agent running. 
> However,
> TRAPS are managed up to the v2c version. I'm currently trying to 
> implement
> the v3 version as well, but without success so far.
>
> Has anyone successfully implemented them? Or is trying so we could 
> share our ideas?

Sending traps is very similar to sending SNMP management messages. Some 
years ago
I had a quick stab at implementing v3 traps on top of Harrold's SNMP 
manager code,
but due to lack of time and customer need I never finished it.

The attached patch comes on top of 
https://savannah.nongnu.org/patch/?9927 and
Harrold's other SNMP patches, see 
https://savannah.nongnu.org/users/harrold68,
and perhaps some other changes we did since then internally. All this is 
based on
an internal lwip fork off commit 0192fe77, but updating it to master 
should be easy.

To send a v3 trap call snmp_mngr_send() with set = 2, and you need to 
implement
snmpv3_get_trap_auth(). The traps v3 patch is fully untested, but should 
be
almost there. The manager code we have running in production for a 
couple of
years now, though I'm not sure if all bugfixes have been sent as patches 
yet.

If you do get v3 traps working, please post a patch and share it with 
this
mailinglist. Perhaps then there is a chance that the SNMP manager patch 
will
be finally upstreamed as well.

Greetings,

Indan

lwip_SNMPv3_traps.patch
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