An example of snmpwalk by java. It needs snmp4j. [Compile] javac -cp <path to a snmp4j.jar> Snmpwalk.java [Execute] java -cp <path to a snmp4j.jar>;. Snmpwalk If there is not the current dir in the path of -cp, java can't find Snmpwalk class...

Snmpwalk.java

import java.io.IOException;
import java.util.List;
import org.snmp4j.CommunityTarget;
import org.snmp4j.Snmp;
import org.snmp4j.TransportMapping;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.smi.Address;
import org.snmp4j.smi.GenericAddress;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.VariableBinding;
import org.snmp4j.transport.DefaultUdpTransportMapping;
import org.snmp4j.util.DefaultPDUFactory;
import org.snmp4j.util.TreeUtils;
import org.snmp4j.util.TreeEvent;

public class Snmpwalk {
    private String targetAddr;
    private String oidStr;
    private String commStr;
    private int snmpVersion;
    private String portNum;
    private String usage;

    Snmpwalk() throws IOException {
        // Set default value.
        targetAddr = null;
        oidStr = null;
        commStr = "public";
        snmpVersion = SnmpConstants.version2c;
        portNum =  "161";
        usage = "Usage: snmpwalk [-c communityName -p portNumber -v snmpVersion(1 or 2)] targetAddr oid";
    }

    private void execSnmpwalk() throws IOException {
        Address targetAddress = GenericAddress.parse("udp:"+ targetAddr + "/" + portNum);
        TransportMapping<? extends Address> transport = new DefaultUdpTransportMapping();
        Snmp snmp = new Snmp(transport);
        transport.listen();

        // setting up target
        CommunityTarget target = new CommunityTarget();
        target.setCommunity(new OctetString(commStr));
        target.setAddress(targetAddress);
        target.setRetries(3);
        target.setTimeout(1000 * 3);
        target.setVersion(snmpVersion);
        OID oid;
        try {
            oid = new OID(translateNameToOID(oidStr));
        } catch (Exception e) {
            System.err.println("Failed to understand the OID or object name.");
            throw e;
        }

        // Get MIB data.
        TreeUtils treeUtils = new TreeUtils(snmp, new DefaultPDUFactory());
        List<TreeEvent> events = treeUtils.getSubtree(target, oid);
        if(events == null || events.size() == 0) {
            System.out.println("No result returned.");
            System.exit(1);
        }

        // Handle the snmpwalk result.
        for (TreeEvent event : events) {
            if(event == null) {
                continue;
            }
            if (event.isError()) {
                System.err.println("oid [" + oid + "] " + event.getErrorMessage());
                continue;
            }

            VariableBinding[] varBindings = event.getVariableBindings();
            if(varBindings == null || varBindings.length == 0) {
                continue;
            }
            for (VariableBinding varBinding : varBindings) {
                if (varBinding == null) {
                    continue;
                }
                System.out.println(
                        varBinding.getOid() +
                                " : " +
                                varBinding.getVariable().getSyntaxString() +
                                " : " +
                                varBinding.getVariable());
            }
        }
        snmp.close();
    }

    private String translateNameToOID(String oidStr) {
        switch (oidStr) {
            case "mib-2":
                oidStr = ".1.3.6.1.2.1";
                break;
            case "mib2":
                oidStr = ".1.3.6.1.2.1";
                break;
            case "system":
                oidStr = ".1.3.6.1.2.1.1";
                break;
            case "interfaces":
                oidStr = ".1.3.6.1.2.1.2";
                break;
            case "at":
                oidStr = ".1.3.6.1.2.1.3";
                break;
            case "ip":
                oidStr = ".1.3.6.1.2.1.4";
                break;
            case "icmp":
                oidStr = ".1.3.6.1.2.1.5";
                break;
            case "tcp":
                oidStr = ".1.3.6.1.2.1.6";
                break;
            case "udp":
                oidStr = ".1.3.6.1.2.1.7";
                break;
            case "egp":
                oidStr = ".1.3.6.1.2.1.8";
                break;
            case "transmission":
                oidStr = ".1.3.6.1.2.1.10";
                break;
            case "snmp":
                oidStr = ".1.3.6.1.2.1.11";
                break;
        }
        return oidStr;
    }

    private void setArgs(String[] args) {
        if(args.length < 2) {
            System.err.println(usage);
            System.exit(1);
        }

        for (int i=0; i<args.length; i++) {
            if("-c".equals(args[i])) {
                commStr = args[++i];
            }
            else if ("-v".equals(args[i])) {
                if(Integer.parseInt(args[++i]) == 1) {
                    snmpVersion = SnmpConstants.version1;
                }
                else {
                    snmpVersion = SnmpConstants.version2c;
                }
            }
            else if ("-p".equals(args[i])) {
                portNum = args[++i];
            }
            else{
                targetAddr = args[i++];
                oidStr = args[i];
            }
        }
        if(targetAddr == null || oidStr == null) {
            System.err.println(usage);
            System.exit(1);
        }
    }

    // Delegate main function to Snmpwalk.
    public static void main(String[] args) {
        try{
            Snmpwalk snmpwalk = new Snmpwalk();
            snmpwalk.setArgs(args);
            snmpwalk.execSnmpwalk();
        }
        catch(Exception e) {
            System.err.println("----- An Exception happened as follows. Please confirm the usage etc. -----");
            System.err.println(e.getMessage());
            e.printStackTrace();
        }
    }
}

HI I am following this code and stuck at some point.Any help will be highly appreciated.

Here is my code below:

import java.io.IOException;
import java.util.List;
import org.snmp4j.CommunityTarget;
import org.snmp4j.Snmp;
import org.snmp4j.TransportMapping;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.smi.Address;
import org.snmp4j.smi.GenericAddress;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.VariableBinding;
import org.snmp4j.transport.DefaultUdpTransportMapping;
import org.snmp4j.util.DefaultPDUFactory;
import org.snmp4j.util.TreeUtils;
import org.snmp4j.util.TreeEvent;

public class Snmpwalk {
private String targetAddr;
private String oidStr;
private String commStr;
private int snmpVersion;
private String portNum;
private String usage;

Snmpwalk() throws IOException{
// Set default value.
targetAddr = "66.162.110.25";
oidStr = "1.3.6.1.4.1.7950.2.10.31.3.0";
commStr = "BPMDemo";
snmpVersion = SnmpConstants.version2c;
portNum = "161";
usage = "Usage: snmpwalk -c BPMDemo -v 2c targetAddr oid";
}

private void doSnmpwalk() throws IOException {
Address targetAddress = GenericAddress.parse("udp:"+ targetAddr + "/" + portNum);
TransportMapping transport = new DefaultUdpTransportMapping();
Snmp snmp = new Snmp(transport);
transport.listen();

// setting up target
CommunityTarget target = new CommunityTarget();
target.setCommunity(new OctetString(commStr));
target.setAddress(targetAddress);
target.setRetries(3);
target.setTimeout(1000 * 3);
target.setVersion(snmpVersion);

OID oid = null;
try{
  oid = new OID(oidStr);
}
catch(RuntimeException ex){
  System.out.println("OID is not specified correctly.");
  System.exit(1);
}

TreeUtils treeUtils = new TreeUtils(snmp, new DefaultPDUFactory());      
List<TreeEvent> events = treeUtils.getSubtree(target, oid);
if(events == null || events.size() == 0){
  System.out.println("No result returned.");
  System.exit(1);
}

// Get snmpwalk result.
for (TreeEvent event : events) {
  if(event != null){
    if (event.isError()) {
        System.err.println("oid [" + oid + "] " + event.getErrorMessage());
      }

    VariableBinding[] varBindings = event.getVariableBindings();
    if(varBindings == null || varBindings.length == 0){
      System.out.println("No result returned.");
    }
    for (VariableBinding varBinding : varBindings) {
      System.out.println(
          varBinding.getOid() + 
          " : " + 
          varBinding.getVariable().getSyntaxString() +
          " : " +
          varBinding.getVariable());
    }
  }
}
snmp.close();

}

private void checkAndSetArgs(String[] args){
if(args.length < 2){
System.err.println(usage);
System.exit(1);
}

for (int i=0; i<args.length; i++){
  if("-c".equals(args[i])){
    commStr = args[++i]; 
  }
  else if ("-v".equals(args[i])){
    if(Integer.parseInt(args[++i]) == 1){
      snmpVersion = SnmpConstants.version1;
    }
    else {
      snmpVersion = SnmpConstants.version2c;
    }
  }
  else if ("-p".equals(args[i])){
    portNum = args[++i];
  }
  else{
    targetAddr = args[i++];
    oidStr = args[i];
  }
}
if(targetAddr == null || oidStr == null){
  System.err.println(usage);
  System.exit(1);
}

}

// Delegate main function to Snmpwalk.
public static void main(String[] args){
try{
Snmpwalk snmpwalk = new Snmpwalk();
snmpwalk.checkAndSetArgs(args);
snmpwalk.doSnmpwalk();
}
catch(Exception e){
System.err.println("----- An Exception happend as follows. Please confirm the usage. -----");
e.printStackTrace();
System.err.println("--------------------");
}
}
}

and from the terminal I am running the command

java -cp .:snmp4j-2.2.2.jar Snmpwalk -c BPMDemo -p 161 -v 2

The result output i always get as No result found !.

with the same config I could get proper response from MIB Browser.(http://oi44.tinypic.com/25s279x.jpg)
Please help me to find where i am going wrong.
Thanks.

Hi Eswaramoorthy

Thank you for you comment, and sorry for my late answer.
If you are still looking for the answer, please check my answer.

I think if you change the following code, it should work.

[Before]
oidStr = "1.3.6.1.4.1.7950.2.10.31.3.0";
[After]
oidStr = "1.3.6.1.4.1.7950.2.10.31.3";

This code is for snmpwalk, so it doesn't need the instance number of MIB.
In the case of snmpget, you need it.

Best regards,
Akira

hi

i following your code and i run command in terminal
java -cp .:snmp4j-2.2.5.jar -c y5entSnmp -p 161 -v 1 10.8.72.134 iso.3.6.1.2.1.2.2.1.10.5

get error message
OID is not specified correctly.

please help me.

Best Regards

phat

Hi,

In this code varBinding.getVariable()) gives the value without its units. Is there a way to get the value with its units?

Thank you.

Sorry that I didn't sign-in the git-hub for a while...

HENG-SOPHAT
I dont think snmp4j supports an input like "iso.3.6.1.2.1.2.2.1.10.5". It should be "1.3.6.1.2.1.2.2.1.10.5".

sajinidesilva
I cant catch the meaning of "units". Please check the javadoc for snmp4j...