SNMP4j实现同步和异步的Walk的示例

最新推荐文章于 2021-03-30 17:47:09 发布

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最新推荐文章于 2021-03-30 17:47:09 发布

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本文提供了一个使用 snmp4j 库进行同步和异步 SNMP Walk 的 Java 示例代码，展示了如何从设备获取 OID 值。

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环境参数
代码示例
- 同步WALK
- 异步WALK

[一]、环境参数

jdk 1.6.0_18
snmp4j 1.11.3

[二]、代码示例

1.同步WALK（v2c）

代码：SnmpWalk.java

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package com.micmiu.snmp4j.demo1x;
 
import java.io.IOException;
 
import org.snmp4j.CommunityTarget;
import org.snmp4j.PDU;
import org.snmp4j.Snmp;
import org.snmp4j.TransportMapping;
import org.snmp4j.event.ResponseEvent;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.smi.Address;
import org.snmp4j.smi.GenericAddress;
import org.snmp4j.smi.Integer32;
import org.snmp4j.smi.Null;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.VariableBinding;
import org.snmp4j.transport.DefaultUdpTransportMapping;
 
/**
 * 演示：WALK的方式获取值
 *
 * blog http://www.micmiu.com
 *
 * @author Michael
 */
public class SnmpWalk {
 
	public static final int DEFAULT_VERSION = SnmpConstants.version2c;
	public static final String DEFAULT_PROTOCOL = "udp";
	public static final int DEFAULT_PORT = 161;
	public static final long DEFAULT_TIMEOUT = 3 * 1000L;
	public static final int DEFAULT_RETRY = 3;
 
	/**
	 * 创建对象communityTarget
	 *
	 * @param targetAddress
	 * @param community
	 * @param version
	 * @param timeOut
	 * @param retry
	 * @return CommunityTarget
	 */
	public static CommunityTarget createDefault(String ip, String community) {
		Address address = GenericAddress.parse(DEFAULT_PROTOCOL + ":" + ip
				+ "/" + DEFAULT_PORT);
		CommunityTarget target = new CommunityTarget();
		target.setCommunity(new OctetString(community));
		target.setAddress(address);
		target.setVersion(DEFAULT_VERSION);
		target.setTimeout(DEFAULT_TIMEOUT); // milliseconds
		target.setRetries(DEFAULT_RETRY);
		return target;
	}
 
	/**
	 * @param ip
	 * @param community
	 * @param oid
	 */
	public static void snmpWalk(String ip, String community, String targetOid) {
 
		CommunityTarget target = SnmpUtil.createDefault(ip, community);
		TransportMapping transport = null;
		Snmp snmp = null;
		try {
			transport = new DefaultUdpTransportMapping();
			snmp = new Snmp(transport);
			transport.listen();
 
			PDU pdu = new PDU();
			OID targetOID = new OID(targetOid);
			pdu.add(new VariableBinding(targetOID));
 
			boolean finished = false;
			System.out.println("----&gt; demo start &lt;----");
			while (!finished) {
				VariableBinding vb = null;
				ResponseEvent respEvent = snmp.getNext(pdu, target);
 
				PDU response = respEvent.getResponse();
 
				if (null == response) {
					System.out.println("responsePDU == null");
					finished = true;
					break;
				} else {
					vb = response.get(0);
				}
				// check finish
				finished = checkWalkFinished(targetOID, pdu, vb);
				if (!finished) {
					System.out.println("==== walk each vlaue :");
					System.out.println(vb.getOid() + " = " + vb.getVariable());
 
					// Set up the variable binding for the next entry.
					pdu.setRequestID(new Integer32(0));
					pdu.set(0, vb);
				} else {
					System.out.println("SNMP walk OID has finished.");
					snmp.close();
				}
			}
			System.out.println("----&gt; demo end &lt;----");
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("SNMP walk Exception: " + e);
		} finally {
			if (snmp != null) {
				try {
					snmp.close();
				} catch (IOException ex1) {
					snmp = null;
				}
			}
		}
 
	}
 
	/**
	 * 1)responsePDU == null&lt;br&gt;
	 * 2)responsePDU.getErrorStatus() != 0&lt;br&gt;
	 * 3)responsePDU.get(0).getOid() == null&lt;br&gt;
	 * 4)responsePDU.get(0).getOid().size() &lt; targetOID.size()&lt;br&gt;
	 * 5)targetOID.leftMostCompare(targetOID.size(),responsePDU.get(0).getOid())
	 * !=0&lt;br&gt;
	 * 6)Null.isExceptionSyntax(responsePDU.get(0).getVariable().getSyntax())&lt;br&gt;
	 * 7)responsePDU.get(0).getOid().compareTo(targetOID) &lt;= 0&lt;br&gt;
	 *
	 * @param resquestPDU
	 * @param targetOID
	 * @param responsePDU
	 * @param vb
	 * @return
	 */
	private static boolean checkWalkFinished(OID targetOID, PDU pdu,
			VariableBinding vb) {
		boolean finished = false;
		if (pdu.getErrorStatus() != 0) {
			System.out.println("[true] responsePDU.getErrorStatus() != 0 ");
			System.out.println(pdu.getErrorStatusText());
			finished = true;
		} else if (vb.getOid() == null) {
			System.out.println("[true] vb.getOid() == null");
			finished = true;
		} else if (vb.getOid().size() &lt; targetOID.size()) {
			System.out.println("[true] vb.getOid().size() &lt; targetOID.size()");
			finished = true;
		} else if (targetOID.leftMostCompare(targetOID.size(), vb.getOid()) != 0) {
			System.out.println("[true] targetOID.leftMostCompare() != 0");
			finished = true;
		} else if (Null.isExceptionSyntax(vb.getVariable().getSyntax())) {
			System.out
					.println("[true] Null.isExceptionSyntax(vb.getVariable().getSyntax())");
			finished = true;
		} else if (vb.getOid().compareTo(targetOID) &lt;= 0) {
			System.out.println("[true] Variable received is not "
					+ "lexicographic successor of requested " + "one:");
			System.out.println(vb.toString() + " &lt;= " + targetOID);
			finished = true;
		}
		return finished;
 
	}
 
	/**
	 *
	 * @param args
	 */
	public static void main(String[] args) {
		String ip = "192.168.8.254";
		String community = "public";
		// 1.3.6.1.2.1.2.2.1.2
		String targetOid = ".1.3.6.1.2.1.1";
		SnmpWalk.snmpWalk(ip, community, targetOid);
 
	}
 
}

运行结果：

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----&gt;
demo
start
&lt;----

====
walk
each
vlaue
:

1.3.6.1.2.1.1.1.0
=
H3C
ICG2000

H3C
Comware
Platform
Software

Comware
Software
Version
5.20,
Release
2104P02

Copyright(c)
2004-2010
Hangzhou
H3C
Technologies
Co.,
Ltd.

 

====
walk
each
vlaue
:

1.3.6.1.2.1.1.2.0
=
1.3.6.1.4.1.25506.1.287

====
walk
each
vlaue
:

1.3.6.1.2.1.1.3.0
=
39
days,
21:47:28.41

====
walk
each
vlaue
:

1.3.6.1.2.1.1.4.0
=
R&amp;D
Hangzhou,
Hangzhou
H3C
Technologies
Co.,
Ltd.

====
walk
each
vlaue
:

1.3.6.1.2.1.1.5.0
=
HX_ICG2000

====
walk
each
vlaue
:

1.3.6.1.2.1.1.6.0
=
Hangzhou,
China

====
walk
each
vlaue
:

1.3.6.1.2.1.1.7.0
=
78

[true]
targetOID.leftMostCompare()
!=
0

SNMP
walk
OID
has
finished.

----&gt;
demo
end
&lt;----

2.异步WALK（v2c）

代码：SnmpWalkAsyn.java

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package com.micmiu.snmp4j.demo1x;
 
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
 
import org.snmp4j.CommunityTarget;
import org.snmp4j.PDU;
import org.snmp4j.Snmp;
import org.snmp4j.event.ResponseEvent;
import org.snmp4j.event.ResponseListener;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.smi.Address;
import org.snmp4j.smi.GenericAddress;
import org.snmp4j.smi.Integer32;
import org.snmp4j.smi.Null;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.VariableBinding;
import org.snmp4j.transport.DefaultUdpTransportMapping;
 
/**
 * 演示：异步GET OID值
 *
 * blog http://www.micmiu.com
 *
 * @author Michael
 *
 */
public class SnmpWalkAsyn {
 
	public static final int DEFAULT_VERSION = SnmpConstants.version2c;
	public static final String DEFAULT_PROTOCOL = "udp";
	public static final int DEFAULT_PORT = 161;
	public static final long DEFAULT_TIMEOUT = 3 * 1000L;
	public static final int DEFAULT_RETRY = 3;
 
	/**
	 * 创建对象communityTarget
	 *
	 * @param targetAddress
	 * @param community
	 * @param version
	 * @param timeOut
	 * @param retry
	 * @return CommunityTarget
	 */
	public static CommunityTarget createDefault(String ip, String community) {
		Address address = GenericAddress.parse(DEFAULT_PROTOCOL + ":" + ip
				+ "/" + DEFAULT_PORT);
		CommunityTarget target = new CommunityTarget();
		target.setCommunity(new OctetString(community));
		target.setAddress(address);
		target.setVersion(DEFAULT_VERSION);
		target.setTimeout(DEFAULT_TIMEOUT); // milliseconds
		target.setRetries(DEFAULT_RETRY);
		return target;
	}
 
	/**
	 * 异步采集信息
	 *
	 * @param ip
	 * @param community
	 * @param oid
	 */
	public static void snmpAsynWalk(String ip, String community, String oid) {
		final CommunityTarget target = createDefault(ip, community);
		Snmp snmp = null;
		try {
			System.out.println("----&gt; demo start &lt;----");
 
			DefaultUdpTransportMapping transport = new DefaultUdpTransportMapping();
			snmp = new Snmp(transport);
			snmp.listen();
 
			final PDU pdu = new PDU();
			final OID targetOID = new OID(oid);
			final CountDownLatch latch = new CountDownLatch(1);
			pdu.add(new VariableBinding(targetOID));
 
			ResponseListener listener = new ResponseListener() {
				public void onResponse(ResponseEvent event) {
					((Snmp) event.getSource()).cancel(event.getRequest(), this);
 
					try {
						PDU response = event.getResponse();
						// PDU request = event.getRequest();
						// System.out.println("[request]:" + request);
						if (response == null) {
							System.out.println("[ERROR]: response is null");
						} else if (response.getErrorStatus() != 0) {
							System.out.println("[ERROR]: response status"
									+ response.getErrorStatus() + " Text:"
									+ response.getErrorStatusText());
						} else {
							System.out
									.println("Received Walk response value :");
							VariableBinding vb = response.get(0);
 
							boolean finished = checkWalkFinished(targetOID,
									pdu, vb);
							if (!finished) {
								System.out.println(vb.getOid() + " = "
										+ vb.getVariable());
								pdu.setRequestID(new Integer32(0));
								pdu.set(0, vb);
								((Snmp) event.getSource()).getNext(pdu, target,
										null, this);
							} else {
								System.out
										.println("SNMP Asyn walk OID value success !");
								latch.countDown();
							}
						}
					} catch (Exception e) {
						e.printStackTrace();
						latch.countDown();
					}
 
				}
			};
 
			snmp.getNext(pdu, target, null, listener);
			System.out.println("pdu 已发送,等到异步处理结果...");
 
			boolean wait = latch.await(30, TimeUnit.SECONDS);
			System.out.println("latch.await =:" + wait);
			snmp.close();
 
			System.out.println("----&gt; demo end &lt;----");
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("SNMP Asyn Walk Exception:" + e);
		}
 
	}
 
	private static boolean checkWalkFinished(OID walkOID, PDU pdu,
			VariableBinding vb) {
		boolean finished = false;
		if (pdu.getErrorStatus() != 0) {
			System.out.println("[true] pdu.getErrorStatus() != 0 ");
			System.out.println(pdu.getErrorStatusText());
			finished = true;
		} else if (vb.getOid() == null) {
			System.out.println("[true] vb.getOid() == null");
			finished = true;
		} else if (vb.getOid().size() &lt; walkOID.size()) {
			System.out.println("[true] vb.getOid().size() &lt; targetOID.size()");
			finished = true;
		} else if (walkOID.leftMostCompare(walkOID.size(), vb.getOid()) != 0) {
			System.out.println("[true] targetOID.leftMostCompare() != 0");
			finished = true;
		} else if (Null.isExceptionSyntax(vb.getVariable().getSyntax())) {
			System.out
					.println("[true] Null.isExceptionSyntax(vb.getVariable().getSyntax())");
			finished = true;
		} else if (vb.getOid().compareTo(walkOID) &lt;= 0) {
			System.out.println("[true] vb.getOid().compareTo(walkOID) &lt;= 0 ");
			finished = true;
		}
		return finished;
 
	}
 
	/**
	 *
	 * @param args
	 */
	public static void main(String[] args) {
 
		String ip = "192.168.8.254";
		String community = "public";
 
		List&lt;String&gt; oidList = new ArrayList&lt;String&gt;();
		oidList.add(".1.3.6.1.2.1.1.1.0");
		oidList.add(".1.3.6.1.2.1.1.3.0");
		oidList.add(".1.3.6.1.2.1.1.5.0");
		// 异步采集数据
		SnmpWalkAsyn.snmpAsynWalk(ip, community, "1.3.6.1.2.1.1");
 
	}
}

运行结果：

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25

----&gt;
demo
start
&lt;----

pdu
已发送,等到异步处理结果...

Received
Walk
response
value
:

1.3.6.1.2.1.1.1.0
=
H3C
ICG2000

H3C
Comware
Platform
Software

Comware
Software
Version
5.20,
Release
2104P02

Copyright(c)
2004-2010
Hangzhou
H3C
Technologies
Co.,
Ltd.

 

Received
Walk
response
value
:

1.3.6.1.2.1.1.2.0
=
1.3.6.1.4.1.25506.1.287

Received
Walk
response
value
:

1.3.6.1.2.1.1.3.0
=
39
days,
21:52:48.80

Received
Walk
response
value
:

1.3.6.1.2.1.1.4.0
=
R&amp;D
Hangzhou,
Hangzhou
H3C
Technologies
Co.,
Ltd.

Received
Walk
response
value
:

1.3.6.1.2.1.1.5.0
=
HX_ICG2000

Received
Walk
response
value
:

1.3.6.1.2.1.1.6.0
=
Hangzhou,
China

Received
Walk
response
value
:

1.3.6.1.2.1.1.7.0
=
78

Received
Walk
response
value
:

[true]
targetOID.leftMostCompare()
!=
0

SNMP
Asyn
walk
OID
value
success
!

latch.await
=:true

----&gt;
demo
end
&lt;----