Quelques notes sur SNMP, ses OID MIB et des implémentation en Java de SNMP (Simple Network Management Protocol).
net-snmp provides the snmpd daemon's uptime in DISMAN-EVENT-MIB::sysUpTimeInstance (.1.3.6.1.2.1.1.3.0)
The real system uptime is available as HOST-RESOURCES-MIB::hrSystemUptime.0 (.1.3.6.1.2.1.25.1.1.0) Many other devices like switches provide only the former OID.
This script can read either of them. Use --sysUpTime or --hrSystemUptime to select the appropriate OID for each device.
1.3.6.1.2.1.1.3.0 uptime
1.3.6.1.2.1.1.1.0 les caractéristique d'une machine (matériellement parlant)
1.3.6.1.2.1.1.5.0 le nom de la machine
1.3.6.1.2.1.1.3.0 le temps et bla bla bla
# snmpwalk -v 2c -c public localhost .1.3.6.1.4.1.2021.13.16.2.1.1
LM-SENSORS-MIB::lmTempSensorsIndex = No Such Object available on this agent at this OID
# snmpwalk -v 2c -c public localhost > /tmp/snmp
# snmpwalk -v 2c -O n -c public localhost > /tmp/snmpn
Address targetAddress = GenericAddress.parse("udp:localhost/161");
String comm = "public";
OID oid = new OID(".1.3.6.1.2.1.1");
List<VariableBinding> result = SnmpUtils.walk(SnmpConstants.version2c,targetAddress,comm,oid);
for (VariableBinding vb: result)
{
out.println(vb.getOid()+" : "+vb.getVariable().toString()+"<br/>");
}
package org.jbs.snmputils;
import java.util.List;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.smi.Address;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.VariableBinding;
/**
*
* @author masjoko
*/
public class SnmpUtils {
public static String get(int version, Address targetaddress, String comm, OID oid)
{
if (version==SnmpConstants.version1)
{
return SnmpV1Utils.get(targetaddress, comm, oid);
} else if (version==SnmpConstants.version2c) {
return SnmpV2cUtils.get(targetaddress, comm, oid);
} else {
return null;
}
}
public static VariableBinding getNext(int version, Address targetaddress, String comm, OID oid)
{
if (version==SnmpConstants.version1)
{
return SnmpV1Utils.getNext(targetaddress, comm, oid);
} else if (version==SnmpConstants.version2c) {
return SnmpV2cUtils.getNext(targetaddress, comm, oid);
} else {
return null;
}
}
public static List<VariableBinding> walk(int version, Address address, String comm, OID rootOID)
{
if (version==SnmpConstants.version1)
{
return SnmpV1Utils.walk(address, comm, rootOID);
} else if (version==SnmpConstants.version2c) {
return SnmpV2cUtils.walk(address, comm, rootOID);
} else {
return null;
}
}
}
package org.jbs.snmputils;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Vector;
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.TransportMapping;
import org.snmp4j.event.ResponseEvent;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.smi.Address;
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;
public class SnmpV2cUtils {
public static String get(Address targetaddress, String comm, OID oid)
{
String ret = null;
TransportMapping transport;
try {
//create transport
transport = new DefaultUdpTransportMapping();
CommunityTarget target = new CommunityTarget();
target.setCommunity(new OctetString("public"));
target.setAddress(targetaddress);
target.setRetries(3);
target.setTimeout(2000);
target.setVersion(SnmpConstants.version2c);
// create the PDU
PDU pdu = new PDU();
pdu.setType(PDU.GET);
//put the oid you want to get
pdu.add(new VariableBinding(oid));
pdu.setNonRepeaters(0);
//pdu string
System.out.println("pdu " + pdu.toString());
Snmp snmp = new Snmp(transport);
snmp.listen();
// send the PDU
ResponseEvent responseEvent = snmp.send(pdu, target);
Logger.getLogger(SnmpV2cUtils.class.getName()).log(Level.INFO,responseEvent.toString());
// extract the response PDU (could be null if timed out)
PDU responsePDU = responseEvent.getResponse();
Logger.getLogger(SnmpV2cUtils.class.getName()).log(Level.INFO,responsePDU.toString());
Vector vbs = responsePDU.getVariableBindings();
if (vbs.size()>0)
{
VariableBinding vb = (VariableBinding) vbs.get(0);
ret = vb.getVariable().toString();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ret;
}
public static VariableBinding getNext(Address targetaddress, String comm, OID oid)
{
VariableBinding ret = null;
TransportMapping transport;
try {
//create transport
transport = new DefaultUdpTransportMapping();
CommunityTarget target = new CommunityTarget();
target.setCommunity(new OctetString("public"));
target.setAddress(targetaddress);
target.setRetries(3);
target.setTimeout(2000);
target.setVersion(SnmpConstants.version2c);
// create the PDU
PDU pdu = new PDU();
pdu.setType(PDU.GETNEXT);
//put the oid you want to get
pdu.add(new VariableBinding(oid));
pdu.setNonRepeaters(0);
//pdu string
System.out.println("pdu " + pdu.toString());
Snmp snmp = new Snmp(transport);
snmp.listen();
// send the PDU
ResponseEvent responseEvent = snmp.send(pdu, target);
Logger.getLogger(SnmpV2cUtils.class.getName()).log(Level.INFO,responseEvent.toString());
// extract the response PDU (could be null if timed out)
PDU responsePDU = responseEvent.getResponse();
Logger.getLogger(SnmpV2cUtils.class.getName()).log(Level.INFO,responsePDU.toString());
Vector vbs = responsePDU.getVariableBindings();
if (vbs.size()>0)
{
ret = (VariableBinding) vbs.get(0);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ret;
}
public static List<VariableBinding> walk(Address address, String comm, OID rootOID)
{
List<VariableBinding> ret = new ArrayList<VariableBinding>();
PDU requestPDU = new PDU();
requestPDU.add(new VariableBinding(rootOID));
requestPDU.setType(PDU.GETBULK);
// maximum oid per pdu request
requestPDU.setMaxRepetitions(5);
CommunityTarget target = new CommunityTarget();
target.setCommunity(new OctetString(comm));
target.setAddress(address);
target.setVersion(SnmpConstants.version2c);
try
{
TransportMapping transport = new DefaultUdpTransportMapping();
Snmp snmp = new Snmp(transport);
transport.listen();
boolean finished = false;
int iter = 0;
while (!finished)
{
VariableBinding vb = null;
ResponseEvent respEvt = snmp.send(requestPDU, target);
Logger.getLogger(SnmpV2cUtils.class.getName()).log(Level.INFO,"GETBULK iteration number "+iter++);
PDU responsePDU = respEvt.getResponse();
if (responsePDU != null)
{
Vector vbs = responsePDU.getVariableBindings();
if (vbs!=null && vbs.size()>0)
{
for (int i=0; i<vbs.size(); i++)
{
// vb sanity check
vb = (VariableBinding) vbs.get(i);
if (vb.getOid() == null)
{
Logger.getLogger(SnmpV2cUtils.class.getName()).log(Level.INFO,"vb.getOid() == null");
finished = true;
break;
} else if (vb.getOid().size() < rootOID.size())
{
Logger.getLogger(SnmpV2cUtils.class.getName()).log(Level.INFO,"vb.getOid().size() < targetOID.size()");
finished = true;
break;
} else if (rootOID.leftMostCompare(rootOID.size(), vb.getOid()) != 0)
{
Logger.getLogger(SnmpV2cUtils.class.getName()).log(Level.INFO,"targetOID.leftMostCompare() != 0)");
finished = true;
break;
} else if (Null.isExceptionSyntax(vb.getVariable().getSyntax()))
{
Logger.getLogger(SnmpV2cUtils.class.getName()).log(Level.INFO,"Null.isExceptionSyntax(vb.getVariable().getSyntax())");
finished = true;
break;
} else if (vb.getOid().compareTo(rootOID) <= 0)
{
Logger.getLogger(SnmpV2cUtils.class.getName()).log(Level.INFO,"Variable received is not "+
"lexicographic successor of requested "+
"one:");
Logger.getLogger(SnmpV2cUtils.class.getName()).log(Level.INFO,vb.toString() + " <= "+rootOID);
finished = true;
break;
}
ret.add(vb);
}
}
}
if (!finished)
{
if (responsePDU == null)
{
Logger.getLogger(SnmpV2cUtils.class.getName()).log(Level.INFO,"responsePDU == null");
finished = true;
} else if (responsePDU.getErrorStatus() != 0)
{
Logger.getLogger(SnmpV2cUtils.class.getName()).log(Level.INFO,"responsePDU.getErrorStatus() != 0");
Logger.getLogger(SnmpV2cUtils.class.getName()).log(Level.INFO,responsePDU.getErrorStatusText());
finished = true;
} else {
// Set up the variable binding for the next entry.
requestPDU.setRequestID(new Integer32(0));
requestPDU.set(0, vb);
}
}
}
snmp.close();
} catch (IOException e)
{
e.printStackTrace();
}
return ret;
}
}
// CPU Load
pdu.add(new VariableBinding(new OID("1.3.6.1.4.1.2021.10.1.3.1"))); // 1 minute Load:
pdu.add(new VariableBinding(new OID("1.3.6.1.4.1.2021.10.1.3.2"))); // 5 minute Load:
pdu.add(new VariableBinding(new OID("1.3.6.1.4.1.2021.10.1.3.3"))); // 15 minute Load
pdu.add(new VariableBinding(new OID("1.3.6.1.4.1.2021.11.11.0"))); // percentages of idle CPU time
// RAM
pdu.add(new VariableBinding(new OID("1.3.6.1.4.1.2021.4.5.0"))); // Total RAM in machine
pdu.add(new VariableBinding(new OID("1.3.6.1.4.1.2021.4.6.0"))); // Total RAM used ??? FREE en fait ??? - http://www.oid-info.com/get/1.3.6.1.4.1.2021.4.6
// pdu.add(new VariableBinding(new OID("1.3.6.1.4.1.2021.4.6.11"))); // noSuchInstance - Total RAM Free - http://www.oid-info.com/get/1.3.6.1.4.1.2021.4.11
// Disk
pdu.add(new VariableBinding(new OID("1.3.6.1.4.1.2021.9.1.6.1"))); // Total size of the disk/partion (kBytes)
pdu.add(new VariableBinding(new OID("1.3.6.1.4.1.2021.9.1.7.1"))); // Available space on the disk
// Uptime
pdu.add(new VariableBinding(new OID("1.3.6.1.2.1.1.3.0"))); // System Uptime (SNMPD)
// 17:26:55 up 2:13, load average: 0.25, 0.21, 0.08
// 2:14:14.79
pdu.add(new VariableBinding(new OID("1.3.6.1.2.1.25.1.1.0"))); // Hardware Uptime