[SNMP4J] Community String has to be equal to security name, is this supposed behavior?

[Guang Yang]

Dear Friends,

 

I am recently using SNMP4J Agent. 

As we know actually SNMP4J using v3 mechanism to simulate v1/v2
community behavior, thus a community will be mapped with a security
name, which is full complied with SNMP-COMMUNITY-MIB.

 

Just found an interesting issue. That is, in case the community String
does not equals to Security Name everything will be confusing. 

To be more detail:

 

I created a security named "mysecurity" by

*          vacm.addAccess

*          vacmMib.addGroup()

 

Tried to map it with a specified community String by operation of 

 

        Variable[] com2secReadOnly = new Variable[] {

             new OctetString("mycommunity"), // community

                // name

                new OctetString("mysecurity"), //  security

                // name

                getAgent().getContextEngineID(), // local engine ID

                new OctetString(WlcsSnmpConfiguration.getInstance()

                        .getContext()), // default context name

                new OctetString(), // transport tag

                new Integer32(StorageType.nonVolatile), // storage type

                new Integer32(RowStatus.active) // row status

        };

 

        communityMIB.getSnmpCommunityEntry().addRow(

             communityMIB.getSnmpCommunityEntry().createRow(

                        new
OctetString("readonlySec2ReadCom").toSubIndex(true), com2secReadOnly));
//this name is not important, right?

 

SNMP does not response. This shall be nothing to do with wrong
community, for I get following statement on console if I test with wrong
community

*          "Community name "wrongcommunity" not found in
SNMP-COMMUNITY-MIB"

 

But mycommunity does not have this report.

 

However, when I create a security named "mycommunity" with SAME API, and
change code like this,

        Variable[] com2secReadOnly = new Variable[] {

             new OctetString("mycommunity"), // community

                // name

                new OctetString("mycommunity"),   //  security

                // name

 

It works without any problem...

Therefore...I am a bit confused. 

 

I will be very appreciated if there is any expert could provide me a
hint. Although this workaround works fine I still would like to know, is
this a supposed behavior?

 

With best regards,

Yang Guang.

Guang Yang (Grant)

----------------------------------------
BEA Telecommunication Technique Center
Software Engineer
----------------------------------------

 

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