我正在使用snmp4j 2.6.2库并尝试通过添加v3 authpriv用户使用mibbrowser发现上下文引擎ID。我能够添加用户，但我在mib浏览器上收到的响应ID是0，而不是正确的请求ID。
public void loadTrapServiceProperties() throws Exception{
try {
Address targetAddress = GenericAddress.parse("udp:" + "127.0.0.1"
+ "/" +8162);
UdpAddress udpAddress = new UdpAddress(InetAddress.getByName("127.0.0.1"), 8161);
TransportMapping transport = new DefaultUdpTransportMapping(udpAddress);
ThreadPool threadPool =
ThreadPool.create("DispatcherPool", 2);
MessageDispatcher disp =
new MultiThreadedMessageDispatcher(threadPool, new MessageDispatcherImpl());
String trapEnginePrefix = "80:00:01:2F:01";
String floatingIP = "xx.x.xx.xx";
setEngineId(trapEnginePrefix, floatingIP);
byte[] eg = engineID.toString().getBytes();
//USM usm = new USM();
USM usm = new USM(SecurityProtocols.getInstance().addDefaultProtocols(), new OctetString(
engineID.toString()), 0);
UsmUser usmuser = new UsmUser(new OctetString("owuser"), AuthSHA.ID,
new OctetString("12345678"), PrivAES128.ID,
new OctetString("12345678"));
disp.addMessageProcessingModel(new MPv3(usm));
snmp = new Snmp(disp,transport);
snmp.setLocalEngine(OctetString.fromHexString(engineID.toString()).toByteArray(),0,0);
snmp.getUSM().addUser(new OctetString("owuser"),usmuser);
snmp.addCommandResponder(this);
transport.listen();
System.out.println("Listening");
// Create Target
target = new UserTarget();
target.setAddress(targetAddress);
target.setRetries(TRAP_RETRIES);
target.setTimeout(TRAP_TIMEOUT);
target.setVersion(SnmpConstants.version3);
target.setSecurityLevel(SecurityLevel.AUTH_PRIV);
target.setSecurityName(new OctetString("owuser"));
} catch (Exception e) {
System.out.println("Error in Sending Trap to (IP:Port)=> {} : {} which is {}");
throw e;
}
}
private String setEngineId(String trapEnginePrefix, String ip) throws Exception {
StringBuilder engineIdStr = null;
try {
String floatingIP[] = ip.split("\\.");
engineID = new StringBuilder(trapEnginePrefix)
.append(":")
.append(appendZeroToString(Integer.toHexString(Integer.parseInt(floatingIP[0])), 2))
.append(":")
.append(appendZeroToString(Integer.toHexString(Integer.parseInt(floatingIP[1])), 2))
.append(":")
.append(appendZeroToString(Integer.toHexString(Integer.parseInt(floatingIP[2])), 2))
.append(":")
.append(appendZeroToString(Integer.toHexString(Integer.parseInt(floatingIP[3])), 2));
engineIdStr = engineID;
engineIdStr = new StringBuilder("80:00:13:70:01:c0:a8:00:06:7b");
engineID = engineIdStr;
System.out.println("Engine ID Generated is {}"+engineIdStr);
} catch (Exception e) {
System.out.println("Error while generating Engine Id "+ e);
throw e;
}
return engineIdStr.toString();
}
// utility to prefix 0's to a number
public static String appendZeroToInteger(int value, int length) {
String valueString = String.valueOf(value);
if (-1 == length) {
return "";
} else {
int valueLength = valueString.length();
for (int i = 0; i < (length - valueLength); i++) {
valueString = "0" + valueString;
}
return valueString;
}
}
// utility to prefix 0's to a string
public static String appendZeroToString(String value, int length) {
String valueString = value;
if (-1 == length) {
return "";
} else {
int valueLength = value.length();
for (int i = 0; i < (length - valueLength); i++) {
valueString = "0" + valueString;
}
return valueString;
}
}
public static void main(String [] arg) throws Exception {
SNMPTest snmpTest = new SNMPTest();
snmpTest.loadTrapServiceProperties();
}
@Override
public void processPdu(CommandResponderEvent e) {
PDU command = (PDU) e.getPDU();
if (command != null) {
System.out.println(command.toString());
if ((command.getType() != PDU.TRAP) &&
(command.getType() != PDU.V1TRAP) &&
(command.getType() != PDU.REPORT) &&
(command.getType() != PDU.RESPONSE)) {
command.setErrorIndex(0);
command.setErrorStatus(0);
command.setType(PDU.RESPONSE);
e.getStateReference().setTransportMapping(e.getTransportMapping());
e.getPduHandle().setTransactionID(command.getRequestID().toInt());
StatusInformation statusInformation = new StatusInformation();
StateReference ref = e.getStateReference();
try {
e.getMessageDispatcher().returnResponsePdu(e.
getMessageProcessingModel(),
e.getSecurityModel(),
e.getSecurityName(),
e.getSecurityLevel(),
command,
e.getMaxSizeResponsePDU(),
ref,
statusInformation);
}
catch (MessageException ex) {
System.err.println("Error while sending response: "+ex.getMessage());
}
}
}
}
” 请求 - 响应数据包
PDU： 30 3f 02 01 03 30 0e 02 01 04 02 03 00 ff ff 04 01 04 02 01 03 04 17 30 15 04 00 02 01 00 02 01 00 04 07 69 6e 69 74 69 61 6c 04 00 04 00 30 11 04 00 04 00 a0 0b 02 01 03 02 01 00 02 01 00 30 00 版本：3（v3） 消息ID：4 最大尺寸：65535 旗帜：4 安全模型：3 安全级别：NO_AUTH_NO_PRIV 权威引擎ID：null 引擎靴：0 发动机时间：0 用户名：初始 验证参数：null Priv参数：null ContextEngineID：null ContextName：null 命令：GET请求 请求ID：3 错误状态：0（无错误。） 错误索引：0 Varbinds：
PDU： 30 64 02 01 03 30 0e 02 01 04 02 03 00 ff ff 04 01 00 02 01 03 04 21 30 1f 04 0a 80 00 13 70 01 c0 a8 00 06 7b 02 01 00 02 01 00 04 07 69 6e 69 74 69 61 6c 04 00 04 00 30 2c 04 0a 80 00 13 70 01 c0 a8 00 06 7b 04 00 a8 1c 02 01 00 02 01 00 02 01 00 30 11 30 0f 06 0a 2b 06 01 06 03 0f 01 01 04 00 41 01 00 版本：3（v3） 消息ID：4 最大尺寸：65535 标志：0 安全模型：3 安全级别：NO_AUTH_NO_PRIV 权威引擎ID：0x 80 00 13 70 01 c0 a8 00 06 7b 引擎靴：0 发动机时间：0 用户名：初始 验证参数：null Priv参数：null ContextEngineID：0x 80 00 13 70 01 c0 a8 00 06 7b ContextName：null 命令：报告 请求ID：0 错误状态：0（无错误。） 错误索引：0 Varbinds： 对象ID：.1.3.6.1.6.3.15.1.1.4.0 柜台：0 “