[lwip-devel] [bug #49136] No SNMPv2 SetRequest response when OID does not exist

[Dirk Ziegelmeier]

URL:
  <http://savannah.nongnu.org/bugs/?49136>

                 Summary: No SNMPv2 SetRequest response when OID does not
exist
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: dziegel
            Submitted on: Tue 20 Sep 2016 12:05:38 PM GMT
                Category: Contrib
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: Confirmed
                 Privacy: Public
             Assigned to: dziegel
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 2.0.0
            lwIP version: git head

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Details:

Reported by Marco Veeneman:

I'm facing a problem with SNMP again and I would like to hear your thoughts
about it.

In <sometable>_get_instance, if no valid instance oid for a row is found, it
returns SNMP_ERR_NOSUCHINSTANCE.

If a user requests to set an invalid table oid using SNMPv1, the SNMP agent
responds with 'error-status: noSuchName (2)'.
This is OK.

If a user requests to set an invalid table oid using SNMPv2, the SNMP agent
doesn't respond at all. It just drops the packet. 
This happens because of the following code in snmp_complete_outbound_frame()
(at line 1366 in snmp_msg.c):
    if (request->error_status >= SNMP_VARBIND_EXCEPTION_OFFSET) {
        return ERR_ARG;
    }
which stops further processing of the request.





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