Hi,
I have created a sample SNMPAgent using the code below:
{
package snmp;
import java.io.File;
import java.io.IOException;
import org.snmp4j.TransportMapping;
import org.snmp4j.agent.BaseAgent;
import org.snmp4j.agent.CommandProcessor;
import org.snmp4j.agent.DuplicateRegistrationException;
import org.snmp4j.agent.MOGroup;
import org.snmp4j.agent.ManagedObject;
import org.snmp4j.agent.mo.DefaultMOFactory;
import org.snmp4j.agent.mo.MOTableRow;
import org.snmp4j.agent.mo.snmp.RowStatus;
import org.snmp4j.agent.mo.snmp.SnmpCommunityMIB;
import org.snmp4j.agent.mo.snmp.SnmpCommunityMIB.SnmpCommunityEntryRow;
import org.snmp4j.agent.mo.snmp.SnmpNotificationMIB;
import org.snmp4j.agent.mo.snmp.SnmpTargetMIB;
import org.snmp4j.agent.mo.snmp.StorageType;
import org.snmp4j.agent.mo.snmp.VacmMIB;
import org.snmp4j.agent.security.MutableVACM;
import org.snmp4j.log.LogFactory;
import org.snmp4j.mp.MPv3;
import org.snmp4j.security.SecurityLevel;
import org.snmp4j.security.SecurityModel;
import org.snmp4j.security.SecurityProtocols;
import org.snmp4j.security.USM;
import org.snmp4j.smi.Address;
import org.snmp4j.smi.GenericAddress;
import org.snmp4j.smi.Integer32;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.Variable;
import org.snmp4j.transport.TransportMappings;
public class SnmpApp extends BaseAgent
{
private static final String address = "0.0.0.0/2001";
private static SnmpApp m_instance = null;
private boolean bRunning ;
private MYMib mymib ;
public static SnmpApp getInstance()
{
if (m_instance == null)
try {
m_instance = new SnmpApp(address) ;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return m_instance;
}
public SnmpApp(String address) throws IOException {
// These files does not exist and are not used but has to be specified
// Read snmp4j docs for more info
super(new File("conf.agent"), new File("bootCounter.agent"),
new CommandProcessor(
new OctetString(MPv3.createLocalEngineID())));
try {
mymib = new MYMib(DefaultMOFactory.getInstance());
mymib .registerMOs(server, null); // Register MY mib
} catch (DuplicateRegistrationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
bRunning = false;
}
/**
* We let clients of this agent register the MO they
* need so this method does nothing
*/
@Override
protected void registerManagedObjects() {
}
/**
* Clients can register the MO they need
*/
public void registerManagedObject(ManagedObject mo) {
try {
server.register(mo, null);
} catch (DuplicateRegistrationException ex) {
throw new RuntimeException(ex);
}
}
public void unregisterManagedObject(MOGroup moGroup) {
moGroup.unregisterMOs(server, getContext(moGroup));
}
/*
* Empty implementation
*/
@Override
protected void addNotificationTargets(SnmpTargetMIB targetMIB,
SnmpNotificationMIB notificationMIB) {
}
/**
* Minimal View based Access Control
*
* http://www.faqs.org/rfcs/rfc2575.html
*/
@Override
protected void addViews(VacmMIB vacm) {
vacm.addGroup(SecurityModel.SECURITY_MODEL_SNMPv2c, new OctetString(
"cpublic"), new OctetString("v1v2group"),
StorageType.nonVolatile);
vacm.addAccess(new OctetString("v1v2group"), new OctetString("public"),
SecurityModel.SECURITY_MODEL_SNMPv2c, SecurityLevel.NOAUTH_NOPRIV,
MutableVACM.VACM_MATCH_EXACT,
new OctetString("fullReadView"),
new OctetString("fullWriteView"),
new OctetString("fullNotifyView"),
StorageType.nonVolatile);
vacm.addViewTreeFamily(new OctetString("fullReadView"), new OID("1.3"),
new OctetString(), VacmMIB.vacmViewIncluded,
StorageType.nonVolatile);
}
/**
* User based Security Model, only applicable to
* SNMP v.3
*
*/
protected void addUsmUser(USM usm) {
}
protected void initTransportMappings() throws IOException {
transportMappings = new TransportMapping[1];
Address addr = GenericAddress.parse(address);
TransportMapping tm = TransportMappings.getInstance()
.createTransportMapping(addr);
transportMappings[0] = tm;
}
/**
* Start method invokes some initialization methods needed to
* start the agent
* @throws IOException
*/
public void start() throws IOException {
init();
bRunning = true;
System.out.println("Started SnmpApp") ;
// This method reads some old config from a file and causes
// unexpected behavior.
// loadConfig(ImportModes.REPLACE_CREATE);
addShutdownHook();
getServer().addContext(new OctetString("public"));
finishInit();
SecurityProtocols.getInstance().addDefaultProtocols();
run();
sendColdStartNotification();
}
protected void unregisterManagedObjects() {
// here we should unregister those objects previously registered...
}
/**
* The table of community strings configured in the SNMP
* engine's Local Configuration Datastore (LCD).
*
* We only configure one, "public".
*/
protected void addCommunities(SnmpCommunityMIB communityMIB) {
Variable[] com2sec = new Variable[] {
new OctetString("public"), // community name
new OctetString("cpublic"), // security name
getAgent().getContextEngineID(), // local engine ID
new OctetString("public"), // default context name
new OctetString(), // transport tag
new Integer32(StorageType.nonVolatile), // storage type
new Integer32(RowStatus.active) // row status
};
MOTableRow row = communityMIB.getSnmpCommunityEntry().createRow(
new OctetString("public2public").toSubIndex(true), com2sec);
communityMIB.getSnmpCommunityEntry().addRow((SnmpCommunityEntryRow) row);
}
MYMib is generated from AgenPro.
I used IReasoning as a client to attempt to retrieve the Read-Only Scalar values with no issues.
However, when i tried to set the scalar values with read-write access. I get an âAccess Deniedâ.
I tried to set the write community to âpublicâ/âcpublicâ. But the result is still access denied.