Re: [Mibble-users] snmpwalk and the loading the MIB files

[punit gupta]

Hi,

Thanks so much for your detailed explanation. It works
alright now. Two more questions:

1.  If this API is not supported, what is the
alternate way?

2. Where are these tables stored? I suppose they are
outside the MIBs. I might be asking a very simple
question here, but I really a beginner in the area.

Thanks once again,
-Punit.


--- Per Cederberg <address@hidden> wrote:

> Hi Punit,
> 
> I see you are using the undocumented internal Mibble
> API
> for SNMP that the Mibble browser is also using. I
> have no
> problem with this, but you should be aware that it
> is
> unsupported and may change without notice in future
> versions.
> 
> The problem you are having is that table OID:s are a
> bit
> special in SNMP. In general and as your code
> assumes, the
> MIB file contains all OID:s and they can be
> retrieved
> through the ObjectIdentifierValue class. However,
> when
> tables are being used, the SNMP agent appends the
> table
> row index to the end of the OID.
> 
> So in your case enterprises.5596.10.3.4.1.3 is the
> OID for
> the string column (in the table), whereas the
> appended .1
> .2 and .3 represent the values on the different rows
> in a
> the table. That is, the "children" to the display
> string
> OID that you see are in fact not children at all,
> but
> different table rows.
> 
> The solution here is to use the OID returned by the
> getNext() operation as input for another getNext()
> call,
> effectively letting the SNMP agent step through the
> MIB
> instead of the ObjectIdentifierValue class (that
> doesn't
> know how many or which rows exist). In the method 
> SnmpPanel.Operation.runGetAll() Mibble implements
> this for
> the Mibble browser:
> 
>             do {
>                 response = manager.getNext(oid);
>                 oid = response.getOid(0);
>                 if
> (oid.startsWith(request.getOid())) {
>                     ...
>                 } else {
>                     ...
>                     stopped = true;
>                 }
>             } while (!stopped);
> 
> Hope this helps!
> 
> /Per
> 
> On mon, 2004-12-13 at 12:56 -0800, punit gupta
> wrote:
> > Hello Sir,
> > 
> > I am building an application to do snmpwalk for a
> > given OID. It works fine except in the case when a
> > particular OID is of type DisplayString. I am not
> able
> > to get the children of the such
> ObjectIdentifierValue
> > objects. For example if I do the snmpwalk using
> the
> > linux's snmpwalk command with
> > "1.3.6.1.4.1.5596.10.3.4.1.3" for a given ID, it
> gives
> > me following output:
> > 
> > SNMPv2-SMI::enterprises.5596.10.3.4.1.3.1 =
> STRING:
> > "130.207.179.65"
> > SNMPv2-SMI::enterprises.5596.10.3.4.1.3.2 = ""
> > SNMPv2-SMI::enterprises.5596.10.3.4.1.3.3 = ""
> > SNMPv2-SMI::enterprises.5596.10.3.4.1.3.4 = ""
> > 
> > When I try the same functionality with my custom
> built
> > snmpwalk using the mibble api, it only gives me
> the
> > first one correctly. Here is the code:
> > 
> > private static void printOid(ObjectIdentifierValue
> > objectidentifiervalue)
> > {
> >  if(objectidentifiervalue.getChildCount() == 0)
> >   try
> >   {
> >    SnmpManager snmpmanager =
> SnmpManager.createSNMPv1
> > (host, port, community);
> >    String s = objectidentifiervalue.toString();
> >    
> >    try
> >    {
> >    SnmpResponse snmpresponse =
> snmpmanager.getNext(s);
> >   
> >
> System.out.println(snmpresponse.getOidsAndValues());
> >    }
> >    catch(SnmpException snmpexception1)
> >    {
> >       System.out.println("error occured");
> >    }
> >   }
> >   catch(SnmpException snmpexception)
> >   {
> >   System.out.println("snmpManager can not be
> created
> > :" + snmpexception.getMessage());
> >   }
> > 
> >   for(int i = 0; i <
> > objectidentifiervalue.getChildCount(); i++)
> >  {
> >    printOid(objectidentifiervalue.getChild(i));
> >   }
> >  }
> > 
> > 
> > When I use the getNext method of SNMPManager on a
> OID
> > which is "child" of a OID Of type DisplayString,
> it
> > still gives me the first "child" of the OID
> > (displayString).
> > 
> > I think it has something to do with DisplayString.
> > Since the children of DisplayString type OID are
> not
> > listed in the mib (right??), they do not appear in
> the
> > getChildren method also.
> > 
> > Any suggestions would be appreciated.
> > Thanks bunch,
> > -Punit.
> 
> 
> 
> 
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>
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> 


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