snmp4j 代理响应 snmpget 请求，但无法响应 snmpwalk 请求

问题描述 投票：0回答：1

我正在尝试创建一个可以响应 snmp v3 walk (getBulk) 请求的 snmp4j 代理。我设法从 snmp4j 库中运行 SampleAgent 类，并能够响应 snmp get 请求。然而，当涉及到 getBulk 请求时，它只是以错误 oid 进行响应。日志似乎也没有表明任何错误。我对 snmp 很陌生，非常感谢任何帮助。

错误信息：

  VBS[1.3.6.1.2.1.11.32.0 = 1]

这意味着

"The total number of Confirmed Class PDUs
(such as GetRequest-PDUs, GetNextRequest-PDUs,
GetBulkRequest-PDUs, SetRequest-PDUs, and
InformRequest-PDUs) delivered to the SNMP entity which
were silently dropped because the transmission of
the (possibly translated) message to a proxy target
failed in a manner (other than a time-out) such that
no Response Class PDU (such as a Response-PDU) could
be returned."

oid 的配置如下

        OID oid = new OID("1.3.6.1.2.1.2.2.1");
        try{
            MOTableSubIndex[] subIndexes = { v4Agent.getFactory().createSubIndex(null, SMIConstants.SYNTAX_OCTET_STRING, 1, 100)};
            MOTableIndex moTableIndex = new MOTableIndex(subIndexes);
            MOColumn[] moColumns = {
                        v4Agent.getFactory().createColumn(5, SMIConstants.SYNTAX_OCTET_STRING, v4Agent.getFactory().createAccess(MOAccessImpl.ACCESSIBLE_FOR_READ_ONLY)),
                        v4Agent.getFactory().createColumn(10, SMIConstants.SYNTAX_OCTET_STRING, v4Agent.getFactory().createAccess(MOAccessImpl.ACCESSIBLE_FOR_READ_ONLY)),
                        v4Agent.getFactory().createColumn(16, SMIConstants.SYNTAX_OCTET_STRING, v4Agent.getFactory().createAccess(MOAccessImpl.ACCESSIBLE_FOR_READ_ONLY)),
                        v4Agent.getFactory().createColumn(7, SMIConstants.SYNTAX_OCTET_STRING, v4Agent.getFactory().createAccess(MOAccessImpl.ACCESSIBLE_FOR_READ_ONLY)),
                        v4Agent.getFactory().createColumn(8, SMIConstants.SYNTAX_OCTET_STRING, v4Agent.getFactory().createAccess(MOAccessImpl.ACCESSIBLE_FOR_READ_ONLY)),
            };

            DefaultMOTable<MOTableRow, MOColumn, MOTableModel<MOTableRow>> table = new DefaultMOTable<>(oid, moTableIndex, moColumns);

            table.setModel(v4Agent.getFactory().createTableModel(oid, moTableIndex, moColumns));

            DefaultMOMutableTableModel model = (DefaultMOMutableTableModel) table.getModel();
            model.setRowFactory((MOTableRowFactory) v4Agent.getFactory());

            addRow(model, String.valueOf(1), new Variable[]{new OctetString("yo"), new OctetString("11"), new Counter32(1), new Counter64(11), new Integer32(1)});
            addRow(model, String.valueOf(2), new Variable[]{new OctetString("howdy"), new OctetString("22"), new Counter32(2), new Counter64(22), new Integer32(2)});
            addRow(model, String.valueOf(3), new Variable[]{new OctetString("wassup"), new OctetString("33"), new Counter32(3), new Counter64(33), new Integer32(3)});

            v4Agent.server.register(table, null);
        } catch (DuplicateRegistrationException e){
            logger.error("duplicated oid ", e);
        }
        //add view to oid
        addView(v4Agent, oid);

        ...
        private static void addRow(DefaultMOMutableTableModel model, String oid, Variable[] value) {
            model.addRow(model.createRow(new OID(oid), value));
        }

和日志

2024-02-29 16:06:20.785 DefaultUDPTransportMapping_127.0.0.1/161 DEBUG Received message from /127.0.0.1/51996 with length 138: 30:81:87:02:01:03:30:10:02:03:00:95:67:02:03:00:ff:ff:04:01:07:02:01:03:04:36:30:34:04:0d:80:00:13:70:01:c0:a8:79:00:71:af:e2:79:02:01:01:02:02:0d:99:04:04:75:73:65:72:04:0c:43:21:8a:83:3e:09:bf:55:ff:63:5f:a2:04:08:00:00:00:01:29:13:98:26:04:38:ce:88:5e:f0:17:f0:36:a9:53:00:93:55:d0:67:21:5b:19:4a:26:cb:35:a2:f0:20:8f:a2:00:8c:9d:ea:4e:5f:1d:07:65:d9:71:45:96:80:20:34:be:7b:2d:ed:24:18:5e:2b:c3:37:00:c3:93:ba
2024-02-29 16:06:20.785 DefaultUDPTransportMapping_127.0.0.1/161 DEBUG SNMPv3 header decoded: msgId=38247, msgMaxSize=65535, msgFlags=07, secModel=3
2024-02-29 16:06:20.785 DefaultUDPTransportMapping_127.0.0.1/161 DEBUG PduHandle for messageID 38247 not found in MPv3.Cache
2024-02-29 16:06:20.785 DefaultUDPTransportMapping_127.0.0.1/161 DEBUG getUser(engineID=80:00:13:70:01:c0:a8:79:00:71:af:e2:79, securityName=user)
2024-02-29 16:06:20.786 DefaultUDPTransportMapping_127.0.0.1/161 DEBUG CheckTime: time ok (authoritative)
2024-02-29 16:06:20.786 DefaultUDPTransportMapping_127.0.0.1/161 DEBUG RFC3412 ��7.2.10 - Received PDU is NOT a response or internal class message -> unchanged PduHandle = PduHandle[872645]
2024-02-29 16:06:20.786 DefaultUDPTransportMapping_127.0.0.1/161 DEBUG Adding cache entry: StateReference[msgID=38247,pduHandle=PduHandle[872645],securityEngineID=80:00:13:70:01:c0:a8:79:00:71:af:e2:79,securityModel=org.snmp4j.security.USM@694abbdc,securityName=user,securityLevel=3,contextEngineID=0002651100[02],contextName=,retryMsgIDs=null]
2024-02-29 16:06:20.786 DefaultUDPTransportMapping_127.0.0.1/161 DEBUG Fire process PDU event: CommandResponderEvent[securityModel=3, securityLevel=3, maxSizeResponsePDU=65353, pduHandle=PduHandle[872645], stateReference=StateReference[msgID=38247,pduHandle=null,securityEngineID=80:00:13:70:01:c0:a8:79:00:71:af:e2:79,securityModel=org.snmp4j.security.USM@694abbdc,securityName=user,securityLevel=3,contextEngineID=0002651100[02],contextName=,retryMsgIDs=null], pdu=GETBULK[{contextEngineID=0002651100[02], contextName=}, requestID=872645, errorStatus=0, errorIndex=10, VBS[1.3.6.1.2.1.2.2.1.5 = Null]], messageProcessingModel=3, securityName=user, processed=false, peerAddress=127.0.0.1/51996, transportMapping=org.snmp4j.transport.DefaultUdpTransportMapping@527740a2, tmStateReference=TransportStateReference[transport=org.snmp4j.transport.DefaultUdpTransportMapping@527740a2, address=127.0.0.1/161, securityName=null, requestedSecurityLevel=undefined, transportSecurityLevel=undefined, sameSecurity=false, sessionID=java.net.DatagramSocket@73af1184, target=null]]
2024-02-29 16:06:20.787 DefaultUDPTransportMapping_127.0.0.1/161 DEBUG Processing proxy request with proxy forwarder org.snmp4j.agent.mo.snmp.ProxyForwarderImpl@63801ac3
2024-02-29 16:06:20.787 SampleAgent.0 INFO No matching proxy entry found for contextEngineID=0002651100[02], context= and request=org.snmp4j.agent.ProxyForwardRequest[coexistenceInfo=CoexistenceInfo[securityName=user,contextEngineID=0002651100[02],contextName=,transportTag=null],proxyType=1,commandEvent=CommandResponderEvent[securityModel=3, securityLevel=3, maxSizeResponsePDU=65353, pduHandle=PduHandle[872645], stateReference=StateReference[msgID=38247,pduHandle=null,securityEngineID=80:00:13:70:01:c0:a8:79:00:71:af:e2:79,securityModel=org.snmp4j.security.USM@694abbdc,securityName=user,securityLevel=3,contextEngineID=0002651100[02],contextName=,retryMsgIDs=null], pdu=GETBULK[{contextEngineID=0002651100[02], contextName=}, requestID=872645, errorStatus=0, errorIndex=10, VBS[1.3.6.1.2.1.2.2.1.5 = Null]], messageProcessingModel=3, securityName=user, processed=false, peerAddress=127.0.0.1/51996, transportMapping=org.snmp4j.transport.DefaultUdpTransportMapping@527740a2, tmStateReference=TransportStateReference[transport=org.snmp4j.transport.DefaultUdpTransportMapping@527740a2, address=127.0.0.1/161, securityName=null, requestedSecurityLevel=undefined, transportSecurityLevel=undefined, sameSecurity=false, sessionID=java.net.DatagramSocket@73af1184, target=null]]]
2024-02-29 16:06:20.787 SampleAgent.0 DEBUG Removed msgId retry cache sub-entry: 38247 from msgIdToPduHandleMapping: PduHandle[872645]
2024-02-29 16:06:20.788 SampleAgent.0 DEBUG Removed cache entry: StateReference[msgID=38247,pduHandle=null,securityEngineID=80:00:13:70:01:c0:a8:79:00:71:af:e2:79,securityModel=org.snmp4j.security.USM@694abbdc,securityName=user,securityLevel=3,contextEngineID=0002651100[02],contextName=,retryMsgIDs=null] for PduHandle[872645]
2024-02-29 16:06:20.788 SampleAgent.0 DEBUG Removed cache entry on getEntry: StateReference[msgID=38247,pduHandle=PduHandle[872645],securityEngineID=80:00:13:70:01:c0:a8:79:00:71:af:e2:79,securityModel=org.snmp4j.security.USM@694abbdc,securityName=user,securityLevel=3,contextEngineID=0002651100[02],contextName=,retryMsgIDs=null] for msgID 38247
2024-02-29 16:06:20.788 SampleAgent.0 DEBUG RFC3414 ��3.1.4.a Outgoing message needs to be encrypted
2024-02-29 16:06:20.788 SampleAgent.0 DEBUG Preparing decrypt_params.
2024-02-29 16:06:20.788 SampleAgent.0 DEBUG Preparing iv for encryption.
2024-02-29 16:06:20.788 SampleAgent.0 DEBUG Encryption finished.
2024-02-29 16:06:20.788 SampleAgent.0 DEBUG Sending message to 127.0.0.1/51996 from 127.0.0.1/161 with length 129: 30:7f:02:01:03:30:10:02:03:00:95:67:02:03:00:ff:ff:04:01:03:02:01:03:04:36:30:34:04:0d:80:00:13:70:01:c0:a8:79:00:71:af:e2:79:02:01:01:02:02:0d:99:04:04:75:73:65:72:04:0c:18:c1:52:a5:62:cc:88:fa:03:3c:d5:b5:04:08:00:00:00:01:d4:92:15:49:04:30:51:3c:5d:46:07:b1:1d:b9:67:62:b0:af:85:fa:24:2c:8e:3e:88:d1:7d:8c:5e:e1:d7:3d:77:da:f7:d0:c8:b4:59:ef:04:54:48:d2:d2:a5:0d:f7:9f:d0:06:d7:6d:70
2024-02-29 16:06:20.788 SampleAgent.0 DEBUG Sending packet to 127.0.0.1/51996
java snmp snmp4j snmpwalk
1个回答
0
投票

问题解决了。

事实证明经纪人没问题，问题出在经理身上。

经理在行走时在 pdu 中设置上下文引擎 id，这导致代理寻找不存在的代理...

删除它，一切正常

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