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java - 关于 SNMP4j V3 的并行、并发 SNMP 请求的奇怪问题

转载 作者:行者123 更新时间:2023-11-30 12:08:45 28 4
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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 concureent IP1 时,IP2 没问题收到一切正常我收到两个响应 PDU。此外,当我尝试发送 IP1、IP3 一切正常时,我成功收到响应,但是当我同时尝试 IP2、IP3 时,IP3 请求总是失败,我收到的响应 PDU 为空。谁能告诉我哪里出了问题?

并发IP1,IP2没问题收到一切正常。并发IP1,IP3没问题收到一切正常。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。当使它们独一无二时,一切都很好。

关于java - 关于 SNMP4j V3 的并行、并发 SNMP 请求的奇怪问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54194874/

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