[SNMP4J] A question about getTable

[Enrique J. Garcia Diaz]

Hi Frank,

I am going to try to explain better my question...

I have implemented a method that returns a list with the rows of any table.
The method is called getTable and the code is below.

    public List getTable(String[] oid)   {
        try  {
            snmp.listen();
        }
        catch (IOException e)  {
            e.printStackTrace();
        }

        TableUtils utils = new TableUtils(snmp, new DefaultPDUFactory());

        OID lowerIndex = null;
        OID upperIndex = null;

        OID[] arr = new OID[oid.length];
        for (int i=0; i<oid.length; i++) arr[i] = new OID(oid[i]);

        List list = utils.getTable(target, arr, lowerIndex, upperIndex);

        return list;
    }

The input of this method is an array of String that represents the OIDs. In
the case of the table TcpConnTable (from RFC1213) the array contains the
following values:

String [] tcpConnTable = { ".1.3.6.1.2.1.6.13.1.1", ".1.3.6.1.2.1.6.13.1.2",
".1.3.6.1.2.1.6.13.1.3", ".1.3.6.1.2.1.6.13.1.4", ".1.3.6.1.2.1.6.13.1.5" };

".1.3.6.1.2.1.6.13.1.1" belongs to tcpConnState, ".1.3.6.1.2.1.6.13.1.2"
belongs to tcpConnLocalAddress, etc.

The returned value of this method in the case of TcpConnTable is not valid
(is null) and nullPointerException is thrown.

I have found some cases that the method returns valid values. For example if
I call the method with the following array of String:
String [] hrSWRunTable = { ".1.3.6.1.2.1.25.4.2.1.1",
".1.3.6.1.2.1.25.4.2.1.2", ".1.3.6.1.2.1.25.4.2.1.3",
".1.3.6.1.2.1.25.4.2.1.4", ".1.3.6.1.2.1.25.4.2.1.5",
".1.3.6.1.2.1.25.4.2.1.6", ".1.3.6.1.2.1.25.4.2.1.7" }

where,
".1.3.6.1.2.1.25.4.2.1.1" belongs to hrSWRunIndex (from HOST_RESOURCES),
".1.3.6.1.2.1.25.4.2.1.2" belongs to hrSWRunName, etc.

So, I think that the problem is that I am not able to call this method with
the correct array of String that belongs of the list of OIDs of the columns
in the table. I have found with a MIB browser that there is a OIDs like I
wrote in my previous mail (.1.3.6.1.2.1.6.13.1.1.127.0.0.
1.27015.127.0.0.1.1093).

Then, I would like to know if I am doing something wrong and how people
retrieve data from a table like TcpConnTable.

I hope I have explained better with this mail.

Thanks and BR,
Kike


2008/8/12 Frank Fock <fock at agentpp.com>

> Hello Kike,
>
> What exactly is the problem?
>
> Best regards,
> Frank
>
>
> Enrique J. Garcia Diaz wrote:
>
>> Hello everybody!
>>
>> I have tried to look for an answer first to previous messages but,
>> unfortunately I have not found anything that clarify me. So, I apologize
>> if
>> this is not the best place to ask or if someone has asked before.
>>
>> My problem is that I want to make a program that retrieve SNMP
>> information.
>> In particular, I have some problems retrieving information in some tables,
>> in particular, TcpConnTable (RFC1213).
>>
>> The problem is that if I use getTable method (in
>> org.snmp4j.util.TableUtils), I do not receive the data of the tables. The
>> reason is because some OIDs are something like this:
>> .1.3.6.1.2.1.6.13.1.1.127.0.0.1.27015.127.0.0.1.1093, where the last
>> fields
>> are my IP address and the listened port (info that it is likely that I do
>> not know)
>>
>> So, I am not able to retrieve TcpConnTable using SNMP4J. Anybody has any
>> suggestions? How can I get these variables?
>>
>> I have tried to use GetNext and GetBulk methods but the problem is the
>> same,
>> I do not know the exact name of the OID that I want to retrieve. I hope I
>> have expressed correctly the problem and everybody understand it.
>>
>> Thanks in advanced,
>> Kike
>> _______________________________________________
>> SNMP4J mailing list
>> SNMP4J at agentpp.org
>> http://lists.agentpp.org/mailman/listinfo/snmp4j
>>
>
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