[SNMP4J] A question about getTable

[Frank Fock]

Hi Kike,

OIDs do not start with a dot! This is some
stupid notation from NET-SNMP which is
non-standard. Try "1.3.6.1.2.1.6.13.1.1"
instead.

Best regards,
Frank

Enrique J. Garcia Diaz wrote:
> 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 <mailto: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
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> 
> 
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