NM实验1-网络监视

NM实验1-网络监视

本实验2学时

实验目的

使用网络监视工具进行网络流量监视

实验内容和步骤

snmp4j编程示例

import java.io.IOException;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.snmp4j.CommunityTarget;
import org.snmp4j.PDU;
import org.snmp4j.Snmp;
import org.snmp4j.event.ResponseEvent;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.UdpAddress;
import org.snmp4j.smi.VariableBinding;
import org.snmp4j.transport.DefaultUdpTransportMapping;

public class SNMP_MVP {

    public static String command(String IP, String port, String command) {
        String result = "";
        try {
            Snmp snmp = new Snmp(new DefaultUdpTransportMapping());
            snmp.listen();
            CommunityTarget communityTarget = new CommunityTarget();
            communityTarget.setCommunity(new OctetString("wl2019"));
            communityTarget.setVersion(SnmpConstants.version2c);
            communityTarget.setAddress(new UdpAddress(IP + "/" + port));
            PDU pdu = createGetPdu(command);
            result = sendRequest(snmp, pdu, communityTarget);
        } catch (IOException ex) {
            Logger.getLogger(SNMP_MVP.class.getName()).log(Level.SEVERE, null, ex);
            result = ex.toString();
        }
        return result;
    }

    private static PDU createGetPdu(String command) {
        PDU pdu = new PDU();
        pdu.setType(PDU.GET);
        String[] oids = command.split(";");
        for (String oid : oids) {
            pdu.add(new VariableBinding(new OID(oid)));
        }
        return pdu;
    }

    private static String sendRequest(Snmp snmp, PDU pdu, CommunityTarget target) throws IOException {
        ResponseEvent responseEvent = snmp.send(pdu, target);
        PDU response = responseEvent.getResponse();
        StringBuilder result = new StringBuilder();
        if (response == null) {
            System.out.println("TimeOut...");
            return result.toString();
        }
        if (response.getErrorStatus() == PDU.noError) {
            List bindingList = response.getBindingList(new OID("1"));
            bindingList.forEach((vb) -> {
                result.append(vb.toString()).append(" ,").append(vb.getVariable().getSyntaxString()).append("\n");
            });
        } else {
            System.out.println("Error:" + response.getErrorStatusText());
        }
        return result.toString();
    }

    public static void main(String[] args) throws IOException, InterruptedException {        
        String command = command("oop.microais.cn", "161", "1.3.6.1.2.1.1.3.0;1.3.6.1.2.1.2.2.1.11.2;1.3.6.1.2.1.2.2.1.17.2;");
        System.out.println(command);
    }
}

输出示例

1.3.6.1.2.1.1.3.0 = 56 days, 23:28:18.26 ,TimeTicks
1.3.6.1.2.1.2.2.1.11.2 = 469873 ,Counter
1.3.6.1.2.1.2.2.1.17.2 = 3199997 ,Counter

对比在目标机上直接执行snmp客户端命令的结果:

# snmpwalk -v 2c -c wl2019  localhost .1.3.6.1.2.1.2.2.1.17.2
IF-MIB::ifOutUcastPkts.2 = Counter32: 3149327
# snmpwalk -v 2c -c wl2019  localhost .1.3.6.1.2.1.2.2.1.11.2
IF-MIB::ifInUcastPkts.2 = Counter32: 462657
# snmpwalk -v 2c -c wl2019  localhost .1.3.6.1.2.1.2.2.1.2
IF-MIB::ifDescr.1 = STRING: lo
IF-MIB::ifDescr.2 = STRING: Red Hat, Inc Device 0001
IF-MIB::ifDescr.3 = STRING: Red Hat, Inc Device 0001
# snmpwalk -v 2c -c wl2019  localhost .1.3.6.1.2.1.1.3.0
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (490098793) 56 days, 17:23:07.93