我使用版本3 USM模型通过SNMP4J发送SNMP请求。但是，当我发送SNMP请求一致的IP1，IP2时，没有问题，一切正常，我收到了两个响应PDU。另外，当我尝试发送IP1，IP3时，一切正常，我成功接收到响应，但是当我同时尝试IP2，IP3时，总是IP3请求失败，并且我收到响应PDU为空。
谁能告诉我这是什么问题？
并发IP1，IP2没问题，一切正常。
并发IP1，IP3没问题，一切正常。
并发IP2，IP3有问题。 IP3响应PDU始终为空。
public class SnmpFetcher {
static byte[] localEngineID = MPv3.createLocalEngineID();
static{
USM usm = new USM(SecurityProtocols.getInstance(), new OctetString(localEngineID), 0);
SecurityModels.getInstance().addSecurityModel(usm);
}
private Logger logger = Logger.getLogger(SnmpFetcher.class);
private Target target = null;
private SnmpAgentConfig snmpAgentConfig = null;
private TransportMapping<? extends Address> transport = null;
private Snmp snmp = null;
long startTime = System.currentTimeMillis();
public SnmpFetcher(SnmpTarget snmpTarget) {
target = snmpTarget.getTarget();
snmpAgentConfig = snmpTarget.getSnmpAgentConfig();
}
public void start() throws AgentException {
try {
transport = new DefaultUdpTransportMapping();
snmp = new Snmp(transport);
createAuth(snmpAgentConfig, snmp);
logger.debug("SNMP Agent : " + target.getAddress() + " added security info ");
transport.listen();
logger.debug("SNMP Agent : " + target.getAddress() + " UDP transport is listenening ");
} catch (Exception e) {
throw new AgentException(e);
}
}
public void stop() throws AgentException {
if (snmp != null) {
try {
snmp.close();
} catch (IOException e) {
throw new AgentException(e);
}
}
}
private void createAuth(SnmpAgentConfig snmpAgentConfig, Snmp snmp) {
if (snmpAgentConfig instanceof SnmpAgentConfig_v3) {
SnmpAgentConfig_v3 snmpAgentConfig_v3 = (SnmpAgentConfig_v3) snmpAgentConfig;
OctetString username = new OctetString(snmpAgentConfig_v3.getUsername());
OID authProtocol = snmpAgentConfig_v3.getAuthProtocol();
OctetString authPassword = new OctetString(snmpAgentConfig_v3.getAuthPassword());
OID privProtocol = null;
OctetString privPassword = null;
if (snmpAgentConfig_v3.getPrivProtocol() != null) {
privProtocol = snmpAgentConfig_v3.getPrivProtocol();
}
if (snmpAgentConfig_v3.getPrivPassword() != null) {
privPassword = new OctetString(snmpAgentConfig_v3.getPrivPassword());
}
logger.debug("SNMP Agent : " + target.getAddress() + " localEngineID : " + new OctetString(localEngineID));
snmp.setLocalEngine(localEngineID, 0, 0);
UsmUser usmUser = new UsmUser(username, authProtocol, authPassword, privProtocol, privPassword);
snmp.getUSM().addUser(username, usmUser);
}
}
private DefaultPDUFactory createPDU(int pduType, Target target, SnmpAgentConfig_v3 snmpAgentConfig, String context) {
SnmpAgentConfig_v3 snmpAgentConfig_v3 = (SnmpAgentConfig_v3) snmpAgentConfig;
OctetString contextName = null;
if (context != null) {
contextName = new OctetString(context);
} else {
contextName = new OctetString();
}
OctetString contextEngineID = null;
if (snmpAgentConfig_v3.getContextAgentId() != null) {
contextEngineID = new OctetString(snmpAgentConfig_v3.getContextAgentId());
} else {
contextEngineID = new OctetString();
}
return new DefaultPDUFactory(pduType, contextEngineID, contextName);
}
private DefaultPDUFactory createPDU(int pduType, Target target) {
return new DefaultPDUFactory(pduType);
}
public Map<String, SNMPValue> doWalk(String oid) throws AgentException {
logger.debug("SNMP Agent : " + snmpAgentConfig.getLoopbackip() + " SNMP " + "WALK" + " is started for OID : " + oid);
Map<String, SNMPValue> result = new TreeMap<String, SNMPValue>();
try {
start();
DefaultPDUFactory defaultPDUFactory = createPDU(PDU.GETNEXT, target);
PDU pdu = defaultPDUFactory.createPDU(target);
pdu.setRequestID(new Integer32(SNMPRequestIdHandler.getNextRequestId()));
TreeUtils treeUtils = new TreeUtils(snmp, defaultPDUFactory);
List<TreeEvent> events = treeUtils.getSubtree(target, new OID(oid));
if (events == null || events.size() == 0) {
logger.error("SNMP Agent : " + target.getAddress() + " Error: No result returned, table OID [" + oid + "] ");
return result;
}
for (TreeEvent event : events) {
if (event == null) {
continue;
}
if (event.isError()) {
logger.error("SNMP Agent : " + target.getAddress() + " Error: table OID [" + oid + "] Error Status : " + event.getErrorMessage());
continue;
}
VariableBinding[] varBindings = event.getVariableBindings();
if (varBindings == null || varBindings.length == 0) {
continue;
}
for (VariableBinding varBinding : varBindings) {
if (varBinding == null) {
continue;
}
result.put("." + varBinding.getOid().toString(), new SNMPValue(varBinding));
}
}
} catch (Exception e) {
long endTime = System.currentTimeMillis();
long timeToRun = endTime - startTime;
logger.error("SNMP Agent : " + snmpAgentConfig.getLoopbackip() + " SNMP " + "WALK" + " is failed for OID : " + oid + " , Execution Time : " + timeToRun);
throw new AgentException(e);
} finally {
stop();
}
long endTime = System.currentTimeMillis();
long timeToRun = endTime - startTime;
logger.debug("SNMP Agent : " + snmpAgentConfig.getLoopbackip() + " SNMP " + "WALK" + " is finished for OID : " + oid + " , Record Count : " + result.size() + ", Execution Time : " + timeToRun);
return result;
}
public Map<String, SNMPValue> doWalk(String oid, String context) throws AgentException {
logger.debug("SNMP Agent : " + snmpAgentConfig.getLoopbackip() + " SNMP " + "WALK" + " is started for OID : " + oid);
Map<String, SNMPValue> result = new TreeMap<String, SNMPValue>();
try {
start();
DefaultPDUFactory defaultPDUFactory = createPDU(PDU.GETNEXT, target, (SnmpAgentConfig_v3) snmpAgentConfig, context);
PDU pdu = defaultPDUFactory.createPDU(target);
pdu.setRequestID(new Integer32(SNMPRequestIdHandler.getNextRequestId()));
TreeUtils treeUtils = new TreeUtils(snmp, defaultPDUFactory);
List<TreeEvent> events = treeUtils.getSubtree(target, new OID(oid));
if (events == null || events.size() == 0) {
logger.error("SNMP Agent : " + target.getAddress() + " Error: No result returned, table OID [" + oid + "] , Context : " + context);
return result;
}
for (TreeEvent event : events) {
if (event == null) {
continue;
}
if (event.isError()) {
logger.error("SNMP Agent : " + target.getAddress() + " Error: table OID [" + oid + "] , Context : " + context + " Error Status : " + event.getErrorMessage());
continue;
}
VariableBinding[] varBindings = event.getVariableBindings();
if (varBindings == null || varBindings.length == 0) {
continue;
}
for (VariableBinding varBinding : varBindings) {
if (varBinding == null) {
continue;
}
result.put("." + varBinding.getOid().toString(), new SNMPValue(varBinding));
}
}
} catch (Exception e) {
long endTime = System.currentTimeMillis();
long timeToRun = endTime - startTime;
logger.error("SNMP Agent : " + snmpAgentConfig.getLoopbackip() + " SNMP " + "WALK" + " is failed for OID : " + oid + " , Context : " + context + ", Execution Time : " + timeToRun);
throw new AgentException(e);
} finally {
stop();
}
long endTime = System.currentTimeMillis();
long timeToRun = endTime - startTime;
logger.debug("SNMP Agent : " + snmpAgentConfig.getLoopbackip() + " SNMP " + "WALK" + " is finished for OID : " + oid + " , Context : " + context + ", Record Count : " + result.size() + ", Execution Time : " + timeToRun);
return result;
}
public SNMPValue get(String oid) throws AgentException {
logger.debug("SNMP Agent : " + snmpAgentConfig.getLoopbackip() + " SNMP " + "GET" + " is started for OID : " + oid);
long startTime = System.currentTimeMillis();
SNMPValue result = null;
try {
start();
DefaultPDUFactory defaultPDUFactory = createPDU(PDU.GET, target);
PDU pdu = defaultPDUFactory.createPDU(target);
pdu.add(new VariableBinding(new OID(oid)));
pdu.setRequestID(new Integer32(SNMPRequestIdHandler.getNextRequestId()));
logger.debug("SNMP Agent : " + target.getAddress() + " OID [" + oid + "] , PDU Request Id : " + pdu.getRequestID());
ResponseEvent response = snmp.send(pdu, target, transport);
// Process Agent Response
if (response != null) {
PDU responsePDU = response.getResponse();
if (response.getError() != null) {
logger.info("SNMP Agent : " + target.getAddress() + " Response Error : " + response.getError());
response.getError().printStackTrace();
}
if (responsePDU != null) {
logger.debug("SNMP Agent : " + target.getAddress() + " OID [" + oid + "] , PDU Response Id : " + responsePDU.getRequestID());
int errorStatus = responsePDU.getErrorStatus();
int errorIndex = responsePDU.getErrorIndex();
String errorStatusText = responsePDU.getErrorStatusText();
if (errorStatus == PDU.noError) {
if (responsePDU.getVariableBindings() != null && responsePDU.getVariableBindings().size() > 0) {
result = new SNMPValue(responsePDU.getVariableBindings().get(0));
} else {
logger.error("SNMP Agent : " + target.getAddress() + " Error: Empty or null OID [" + oid + "] ");
}
} else {
logger.error("SNMP Agent : " + target.getAddress() + " Error: Request Failed. OID [" + oid + "] , Error Status : " + errorStatus);
throw new AgentException("SNMP Agent : " + target.getAddress() + " Error: Request Failed. OID [" + oid + "] , Error Status : " + errorStatus);
}
} else {
logger.error("SNMP Agent : " + target.getAddress() + " Error: Response PDU is null OID [" + oid + "] ");
throw new AgentException("SNMP Agent : " + target.getAddress() + " Error: Response PDU is null OID [" + oid + "] ");
}
} else {
logger.error("SNMP Agent : " + target.getAddress() + " Error: Agent Timeout. OID [" + oid + "] ");
throw new AgentException("SNMP Agent : " + target.getAddress() + " Error: Agent Timeout. OID [" + oid + "] ");
}
} catch (IOException e) {
long endTime = System.currentTimeMillis();
long timeToRun = endTime - startTime;
logger.error("SNMP Agent : " + snmpAgentConfig.getLoopbackip() + " SNMP " + "GET" + " is failed for OID : " + oid + " , Execution Time : " + timeToRun);
throw new AgentException(e);
} finally {
stop();
}
long endTime = System.currentTimeMillis();
long timeToRun = endTime - startTime;
if (result != null) {
logger.debug("SNMP Agent : " + snmpAgentConfig.getLoopbackip() + " SNMP " + "GET" + " is finished for OID : " + oid + " , Record Count : " + 1 + ", Execution Time : " + timeToRun);
} else {
logger.debug("SNMP Agent : " + snmpAgentConfig.getLoopbackip() + " SNMP " + "GET" + " is finished for OID : " + oid + " , Record Count : " + 0 + ", Execution Time : " + timeToRun);
}
return result;
}
public SNMPValue get(String oid, String context) throws AgentException {
logger.debug("SNMP Agent : " + snmpAgentConfig.getLoopbackip() + " SNMP " + "GET" + " is started for OID : " + oid);
long startTime = System.currentTimeMillis();
SNMPValue result = null;
try {
start();
DefaultPDUFactory defaultPDUFactory = createPDU(PDU.GET, target, (SnmpAgentConfig_v3) snmpAgentConfig, context);
PDU pdu = defaultPDUFactory.createPDU(target);
pdu.add(new VariableBinding(new OID(oid)));
pdu.setRequestID(new Integer32(SNMPRequestIdHandler.getNextRequestId()));
logger.debug("SNMP Agent : " + target.getAddress() + " OID [" + oid + "] , Context : " + context + ", PDU Request Id : " + pdu.getRequestID());
ResponseEvent response = snmp.send(pdu, target, transport);
// Process Agent Response
if (response != null) {
PDU responsePDU = response.getResponse();
if (response.getError() != null) {
logger.info("SNMP Agent : " + target.getAddress() + " Response Error : " + response.getError() + " , Context : " + context);
response.getError().printStackTrace();
}
if (responsePDU != null) {
logger.debug("SNMP Agent : " + target.getAddress() + " OID [" + oid + "] , Context : " + context + ", PDU Response Id : " + responsePDU.getRequestID());
int errorStatus = responsePDU.getErrorStatus();
int errorIndex = responsePDU.getErrorIndex();
String errorStatusText = responsePDU.getErrorStatusText();
if (errorStatus == PDU.noError) {
if (responsePDU.getVariableBindings() != null && responsePDU.getVariableBindings().size() > 0) {
result = new SNMPValue(responsePDU.getVariableBindings().get(0));
} else {
logger.error("SNMP Agent : " + target.getAddress() + " Error: Empty or null OID [" + oid + "] , Context : " + context);
}
} else {
logger.error("SNMP Agent : " + target.getAddress() + " Error: Request Failed. OID [" + oid + "] , Context : " + context + ", Error Status : " + errorStatus);
throw new AgentException("SNMP Agent : " + target.getAddress() + " Error: Request Failed. OID [" + oid + "] , Context : " + context + ", Error Status : " + errorStatus);
}
} else {
logger.error("SNMP Agent : " + target.getAddress() + " Error: Response PDU is null OID [" + oid + "] , Context : " + context);
throw new AgentException("SNMP Agent : " + target.getAddress() + " Error: Response PDU is null OID [" + oid + "] , Context : " + context);
}
} else {
logger.error("SNMP Agent : " + target.getAddress() + " Error: Agent Timeout. OID [" + oid + "] , Context : " + context);
throw new AgentException("SNMP Agent : " + target.getAddress() + " Error: Agent Timeout. OID [" + oid + "] , Context : " + context);
}
} catch (IOException e) {
long endTime = System.currentTimeMillis();
long timeToRun = endTime - startTime;
logger.error("SNMP Agent : " + snmpAgentConfig.getLoopbackip() + " SNMP " + "GET" + " is failed for OID : " + oid + " , Context : " + context + ", Execution Time : " + timeToRun);
throw new AgentException(e);
} finally {
stop();
}
long endTime = System.currentTimeMillis();
long timeToRun = endTime - startTime;
if (result != null) {
logger.debug("SNMP Agent : " + snmpAgentConfig.getLoopbackip() + " SNMP " + "GET" + " is finished for OID : " + oid + " , Context : " + context + ", Record Count : " + 1 + ", Execution Time : " + timeToRun);
} else {
logger.debug("SNMP Agent : " + snmpAgentConfig.getLoopbackip() + " SNMP " + "GET" + " is finished for OID : " + oid + " , Context : " + context + ", Record Count : " + 0 + ", Execution Time : " + timeToRun);
}
return result;
}
}
------------
IP2
new Thread(){
run{
SNMPValue data = snmpFetcher.get(oid);
}
IP3
new Thread(){
run{
SNMPValue data = snmpFetcher.get(oid);
}
最佳答案
我找到了解决方案。两个或多个主机的snmp代理上下文ID相同。
当使它们独特时，一切都很好。