[SNMP4J] How to Remove an SNMP Community String.

[Frank Fock]

Hi Vivi,

I assume that you did not set the coexistence provider
at the CommandProcessor to your instance of the
SnmpCommunityMIB class.

The CommandProcessor then uses the SNMPv1/v2c community
as security name directly without mapping it to a
security name using the SNMP-COMMUNITY-MIB mapping.
Since you have an equal security name in your VACM
configuration, the request goes through.

For further questions read RFC 3414 and 3415.

Regards,
Frank

Vivi Zhang wrote:
> Let me resend the email.
> 
> The previous email content was in an attachment. It did not show up in 
> SNMP4j email archives.
> 
> ============================================================================================= 
> 
> 
> Hi,
> 
> I would really appreciate any help to find a way to remove an SNMP 
> community string .
> I am using SNMP4j 1.9.3c, and SNMP4j agent 1.2.1d.
> 
> I have no problem to add more community string to a running SNMP agent. 
> But, when I have not been successfully remove a community string.
> 
> Following is a section of code which initializes community mib and other 
> mibs.
> 
>        vacmMIB = new VacmMIB(new MOServer[] { server });
>        snmpTargetMIB = new SnmpTargetMIB(dispatcher);
>        snmpNotificationMIB = new SnmpNotificationMIB();
>      *  snmpCommunityMIB = new SnmpCommunityMIB(snmpTargetMIB);*
>        this.getServer().addContext(DEFAULTCONTEXT);
>        initConfigMIB();
>        notificationOriginator = new NotificationOriginatorImpl(session,
>                                                                vacmMIB,
>                                                                
> snmpv2MIB.getSysUpTime(),
>                                                                
> snmpTargetMIB,
>                                                                
> snmpNotificationMIB);
>        snmpv2MIB.setNotificationOriginator(notificationOriginator);
> 
> Following is a section of code which add a community string to community 
> MIB
> 
>        Variable[] com2sec = new Variable[] {
>                new OctetString(aCommunity), SECNAMEV1V2,  
> getContextEngineID(), DEFAULTCONTEXT,
>                new OctetString(), // transport tag
>                new Integer32(StorageType.nonVolatile), // storage type
>                new Integer32(RowStatus.active) // row status
>        };
> 
>        MOTableRow row = 
> communityMIB.getSnmpCommunityEntry().createRow(index,
>                                                                        
> com2sec);
>        communityMIB.getSnmpCommunityEntry().addRow(row);
> 
> To remove all community strings, I tried following code:
>   MOMutableTableModel comEntryModel = 
> (MOMutableTableModel)communityMIB.getSnmpCommunityEntry().getModel();
>   comEntryModel .clear();
> 
> After this call, I expect all community rows are gone, and all SNMP 
> queries should fail.  But this does not happen.
> 
> I also try to remove an individual community string using API call
> communityMIB.getSnmpCommunityEntry().removeRow(index); where index is a 
> valid OID for a community string.
> In both cases, the row is removed, but the event did not fired since 
> moTableModelListeners  == null.
> public synchronized MOTableRow removeRow(OID index) {
>    *MOTableRow row = (MOTableRow) rows.remove(index);*
>    if ((row != null) && (moTableModelListeners != null)) {
>      MOTableModelEvent event =
>         new MOTableModelEvent(this, MOTableModelEvent.ROW_REMOVED, row);
>      fireTableModelChanged(event);
>    }
>    return row;
>  }
> 
> After the calls, I am still able to query the snmp agent with "removed" 
> community string.
> 
> Wonder if it is expected behavior.  Or I need config the 
> TableModelListeners for SnmpCommunityEntry table.
> Please advise.
> 
> Vivi
> _______________________________________________
> SNMP4J mailing list
> SNMP4J at agentpp.org
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