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<VariableBinding> 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
