SNMP4j 代理中的 DuplicateRegistrationException

Question

我正在尝试使用 SNMP4j 代理在 SNMP 代理上注册一组 MO。

public class MyAgent extends BaseAgent {

    public MyAgent() {
        super(new File("bootCounterFileTmpSNMP.txt"), new File("configFileTmpSNMP.txt"),
                new CommandProcessor(new OctetString(MPv3.createLocalEngineID())));
    }

    @Override
    protected void initTransportMappings() throws IOException {
        transportMappings = new TransportMapping<?>[1];
        Address addr = GenericAddress.parse("0.0.0.0/8551"); // not 161 so we dont have to run sudo
        TransportMapping<? extends Address> tm = TransportMappings.getInstance().createTransportMapping(addr);
        transportMappings[0] = tm;
    }

    public void start() throws IOException {
        init();
        addShutdownHook();
        getServer().addContext(new OctetString("public"));
        finishInit();
        run();
        sendColdStartNotification();
    }

    @Override
    protected void registerManagedObjects() {

        getSnmpv2MIB().unregisterMOs(server, getContext(getSnmpv2MIB())); 
        registerManagedObject(new MOScalar(new OID("1.3.6.1.4.1.32437.1.5.1.4.2"), MOAccessImpl.ACCESS_READ_ONLY, new OctetString("object 1")));
        registerManagedObject(new MOScalar(new OID("1.3.6.1.4.1.32437.1.5.1.2.20"), MOAccessImpl.ACCESS_READ_ONLY, new OctetString("object 2")));
        registerManagedObject(new MOScalar(new OID("1.3.6.1.4.1.32437.1.5.1.2.23"), MOAccessImpl.ACCESS_READ_ONLY, new OctetString("object 3")));
        registerManagedObject(new MOScalar(new OID("1.3.6.1.4.1.32437.1.5.1.1.21"), MOAccessImpl.ACCESS_READ_ONLY, new OctetString("object 4")));
        registerManagedObject(new MOScalar(new OID("1.3.6.1.4.1.32437.1.5.1.4.2.1.2"), MOAccessImpl.ACCESS_READ_ONLY, new OctetString("object 5")));

    }
    private void registerManagedObject(MOScalar mo) {
        try {
            server.register(mo, null);
            System.out.print("Successfully registered ");
            System.out.println(mo.getID());
        } catch (DuplicateRegistrationException e) {
            System.out.print("Failed to register ");
            System.out.println(mo.getID());
        }
    }

    @Override
    protected void unregisterManagedObjects() {
        // do nothing
    }

    @Override
    protected void addUsmUser(USM usm) {
        // do nothing
    }

    @Override
    protected void addNotificationTargets(SnmpTargetMIB targetMIB, SnmpNotificationMIB notificationMIB) {
        // do nothing
    }

    @Override
    protected void addViews(VacmMIB vacmMIB) {
        vacmMIB.addGroup(SecurityModel.SECURITY_MODEL_SNMPv2c, new OctetString("cpublic"), new OctetString("v1v2group"),
                StorageType.nonVolatile);

        vacmMIB.addAccess(new OctetString("v1v2group"), new OctetString("public"), SecurityModel.SECURITY_MODEL_ANY,
                SecurityLevel.NOAUTH_NOPRIV, MutableVACM.VACM_MATCH_EXACT, new OctetString("fullReadView"),
                new OctetString("fullWriteView"), new OctetString("fullNotifyView"), StorageType.nonVolatile);

        vacmMIB.addViewTreeFamily(new OctetString("fullReadView"), new OID(".1.3"), new OctetString(),
                VacmMIB.vacmViewIncluded, StorageType.nonVolatile);
    }

    @Override
    protected void addCommunities(SnmpCommunityMIB communityMIB) {
        Variable[] com2sec = new Variable[] {
                new OctetString("public"),              // community name
                new OctetString("cpublic"),             // security name
                getAgent().getContextEngineID(),        // local engine ID
                new OctetString("public"),              // default context name
                new OctetString(),                      // transport tag
                new Integer32(StorageType.nonVolatile), // storage type
                new Integer32(RowStatus.active)         // row status
            };
        SnmpCommunityMIB.SnmpCommunityEntryRow row = communityMIB.getSnmpCommunityEntry().createRow(
              new OctetString("public2public").toSubIndex(true), com2sec);
        communityMIB.getSnmpCommunityEntry().addRow(row);
    }
}

然后到运行吧：

agent = new MyAgent();
agent.start();

这里的输出是：

Successfully registered 1.3.6.1.4.1.32473.1.5.1.4.2
Successfully registered 1.3.6.1.4.1.32473.1.5.1.2.20
Failed to register 1.3.6.1.4.1.32473.1.5.1.2.23
Successfully registered 1.3.6.1.4.1.32473.1.5.1.1.21
Failed to register 1.3.6.1.4.1.32473.1.5.1.4.2.1.2

我收到 DuplicateRegistrationException 的原因是否与地址结构或排序有关？

每个对象都是一个具有唯一 OctetString 值的 org.snmp4j.agent.mo.MOScalar。

相关：registering OIDs with snmp agent

Answer 1

对于那些遵循我的路径的人，这里的关键是在每个地址的末尾添加一个 .0。

这个额外的零标识了该 OID 处的变量，意味着地址不会相互冲突。没有它，它只是一个位置的路径，而不为变量本身创建一个位置。

所以更正后的代码是：

registerManagedObject(new MOScalar(new OID("1.3.6.1.4.1.32437.1.5.1.4.2.0"), MOAccessImpl.ACCESS_READ_ONLY, new OctetString("object 1")));
registerManagedObject(new MOScalar(new OID("1.3.6.1.4.1.32437.1.5.1.2.20.0"), MOAccessImpl.ACCESS_READ_ONLY, new OctetString("object 2")));
registerManagedObject(new MOScalar(new OID("1.3.6.1.4.1.32437.1.5.1.2.23.0"), MOAccessImpl.ACCESS_READ_ONLY, new OctetString("object 3")));
registerManagedObject(new MOScalar(new OID("1.3.6.1.4.1.32437.1.5.1.1.21.0"), MOAccessImpl.ACCESS_READ_ONLY, new OctetString("object 4")));
registerManagedObject(new MOScalar(new OID("1.3.6.1.4.1.32437.1.5.1.4.2.1.2.0"), MOAccessImpl.ACCESS_READ_ONLY, new OctetString("object 5")));

SNMP4j 代理中的 DuplicateRegistrationException

DuplicateRegistrationException in SNMP4j Agent

snmp

snmp4j