[SNMP4J] Re: SNMP4J Digest, Vol 59, Issue 18
Vivi Zhang
vzhang at anuesystems.com
Tue Dec 30 20:06:45 CET 2008
Alex:
I am new to SNMP agent world too. So, my solution might not be the
best, but it works for me.
The remove a community string, I have method which I posted in my
previous email:
/ private void removeOneCommunity(SnmpCommunityMIB communityMIB,
MOTableRow aRow)
{
/
/ MOMutableTableModel comEntryModel =
(MOMutableTableModel)communityMIB.getSnmpCommunityEntry().getModel();
communityMIB.getSnmpCommunityEntry().removeRow(aRow.getIndex());
comEntryModel.freeRow(aRow);
/
/ }/
The community row is an input parameter for this method. To get a
particular row, you can loop through the snmpCommunityEntry table:
/ MOMutableTableModel comEntryModel =
(MOMutableTableModel)communityMIB.getSnmpCommunityEntry().getModel();
MOTableRow aRow;
// Replace public2public if you create community row with
something else.
String myCommunityStringIndex = "public2public";
//OID// o = new OctetString(myCommunityStringIndex
).toSubIndex(true);
for (Iterator<MOTableRow> it = comEntryModel.iterator();
it.hasNext();)
{
aRow = it.next();
if (aRow.getIndex().equals(o))
{
// This is the community row you are looking for.
found = true;
.....
}
}/
The string myCommunityStringIndex is the row index you put in when you
create that row. Following code section is the sample code from
TestAgent::addCommunities() which uses "public2public" for community
string "public":
MOTableRow row =
communityMIB.getSnmpCommunityEntry().createRow(
new OctetString("public2public").toSubIndex(true), com2sec);
Hope this information helps.
To add a community string, following sample code in
TestAgent::addCommunities().
Vivi
Alexander Fooks wrote:
> Hello, Vivi,
>
> Sorry for direct request for your help. I think you may help me.
> I'm looking for solution to add private community to my SNMP agent
> (agent itself and subagent-forwarder).
> Also I want to delete "public" community.
> Could you advise me how to do this? I'm working with SNMP version 2c.
>
>
> Thank you in advance.
>
> Best Regards
>
> Alex Fooks
>
>
> -----Original Message-----
> From: snmp4j-bounces at agentpp.org [mailto:snmp4j-bounces at agentpp.org] On
> Behalf Of snmp4j-request at agentpp.org
> Sent: Tuesday, December 30, 2008 12:42 PM
> To: snmp4j at agentpp.org
> Subject: SNMP4J Digest, Vol 59, Issue 18
>
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> Today's Topics:
>
> 1. Re: How to Remove an SNMP Community String. (Vivi Zhang)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 29 Dec 2008 09:22:11 -0600
> From: Vivi Zhang <vzhang at anuesystems.com>
> Subject: Re: [SNMP4J] How to Remove an SNMP Community String.
> To: Frank Fock <fock at agentpp.com>
> Cc: SNMP4J <snmp4j at agentpp.org>
> Message-ID: <4958EB23.1080508 at anuesystems.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Frank:
>
> Thank you very much for your help. As you suggested, the problem is
> around the coexistenceInfo within SnmpCommunityMIB, indeed.
>
> I did set the coexistence provider at the CommandProcessor. The
> createRow adds a cummunity row entry to coexistenceInfo map.
>
> The statement
> "communityMIB.getSnmpCommunityEntry().removeRow(aRow.getIndex());"
> removes a community row from Community entry table. But this statement
> does not remove the row from coexistenceInfo which is used by
> CommandProcessor to check the security name.
>
> Currently, I added a statement "comEntryModel.freeRow(aRow);"
> immediately after preivous statement, and this stmt helps.
> private void removeOneCommunity(SnmpCommunityMIB communityMIB,
> MOTableRow aRow)
> {
> MOMutableTableModel comEntryModel =
> (MOMutableTableModel)communityMIB.getSnmpCommunityEntry().getModel();
> communityMIB.getSnmpCommunityEntry().removeRow(aRow.getIndex());
> comEntryModel.freeRow(aRow);
> }
>
> The SnmpCommunityEntryRowFactory.freeRow() is invoked which removes the
> community string from coexistenceInfo.
>
> Is this preferred way to remove a community string?
>
> Thanks again.
>
> Vivi
>
> Frank Fock wrote:
>
>> 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
>>> http://lists.agentpp.org/mailman/listinfo/snmp4j
>>>
>
>
>
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> End of SNMP4J Digest, Vol 59, Issue 18
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