[AGENT++] NULL values in a successful Get response

[Frank Fock]

Hi Marek,

I cannot reproduce your problem. What version of AGENT++ are you
using? Does this behavior also occurs with other tables in your agent?

Best regards,
Frank

Marek Malowidzki wrote:

>Hi,
>
>we are getting NULL values returned by an Agent++ agent in a successful
>response to a Get request. Trace is as follows:
>
>D:\SN\snmp_ppnet\VS.NET\SnmpManager\bin\Debug>snmpmanager get
>10.1.0.158 -o1.3.6
>.1.2.1.2.2.1.2.1 -o 1.3.6.1.2.1.2.2.1.3.1 -p5161
>Initialized request_id to 9181.
>Initializing AuthPriv
>Initialized salt to 0xB83E.
>Added Auth object with id (3).
>Added Auth object with id (2).
>Added Priv object with id (2).
>Added default Auth and Priv protocols.
>[0]: Sending PDU to target 10.1.0.158/5161,SNMPv1,public,public
>oid [0]: 1.3.6.1.2.1.2.2.1.2.1
>val [0]:  (Null)
>oid [1]: 1.3.6.1.2.1.2.2.1.3.1
>val [1]:  (Null)
>snmp_engine called with CTarget
>SnmpMsg: return status of snmpBuild (0)
>++ SNMP++: sending to 10.1.0.158/5161:
>30 39 02 01  00 04 06 70  75 62 6C 69  63 A0 2C 02
>02 23 DE 02  01 00 02 01  00 30 20 30  0E 06 0A 2B
>06 01 02 01  02 02 01 02  01 05 00 30  0E 06 0A 2B
>06 01 02 01  02 02 01 03  01 05 00
>++ SNMP++: something received...
>Length received 61 from socket 1736; fromlen 16
>++ SNMP++: data received from 10.1.0.158/5161.
>30 3B 02 01  00 04 06 70  75 62 6C 69  63 A2 2E 02
>02 23 DE 02  01 00 02 01  00 30 22 30  10 06 0A 2B
>06 01 02 01  02 02 01 02  01 04 02 6C  6F 30 0E 06
>0A 2B 06 01  02 01 02 02  01 03 01 05  00
>receive_snmp_response requestID = 9182, returning SUCCESS.
>[0]: Received PDU:
>oid [0]: 1.3.6.1.2.1.2.2.1.2.1
>val [0]: lo (OctetString)
>oid [1]: 1.3.6.1.2.1.2.2.1.3.1
>val [1]:  (Null)
>1 synchronous SNMP request(s) in 109 msec. (9,14285714285714 req./sec.)
>
>The question is: How this is possible? This could be our bug, of course, but
>I believe that NULLs in values should never be observed for a response with
>error-status equal to 0 (Success). This happens for table entries when there
>are more VBs than one. Of course, all variables, for which NULLs are
>returned, are available (when we Get using a single VB, everything is ok).
>
>Agent++ version is 3.5.20a, SNMP++: 3.2.13.
>
>Best regards,
>
>Marek
>
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