com.caucho.server.snmp.SnmpRequest Maven / Gradle / Ivy
/*
* Copyright (c) 1998-2018 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Nam Nguyen
*/
package com.caucho.server.snmp;
import com.caucho.jmx.Jmx;
import com.caucho.network.listen.AbstractProtocolConnection;
import com.caucho.network.listen.SocketLink;
import com.caucho.server.snmp.types.GetResponsePduValue;
import com.caucho.server.snmp.types.IntegerValue;
import com.caucho.server.snmp.types.NullValue;
import com.caucho.server.snmp.types.ObjectIdentifierValue;
import com.caucho.server.snmp.types.OctetStringValue;
import com.caucho.server.snmp.types.SnmpMessageValue;
import com.caucho.server.snmp.types.SnmpValue;
import com.caucho.server.snmp.types.VarBindListValue;
import com.caucho.server.snmp.types.VarBindValue;
import com.caucho.util.L10N;
import com.caucho.vfs.ReadStream;
import javax.management.AttributeNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.ReflectionException;
import java.io.IOException;
import java.io.OutputStream;
import java.util.TreeMap;
import java.util.logging.Logger;
/*
* Responds to SNMP requests.
*/
public class SnmpRequest extends AbstractProtocolConnection
{
private static final Logger log
= Logger.getLogger(SnmpRequest.class.getName());
private static final L10N L = new L10N(SnmpRequest.class);
public static final int NO_ERROR = 0;
public static final int TOO_BIG = 1;
public static final int NO_SUCH_NAME = 2;
public static final int BAD_VALUE = 3;
public static final int READ_ONLY = 4;
public static final int GENERAL_ERROR = 5;
private final SocketLink _connection;
private IntegerValue _version = IntegerValue.ZERO;
private final OctetStringValue _communityString;
private TreeMap _mibMap;
public SnmpRequest(SocketLink connection,
TreeMap mibMap,
OctetStringValue community)
{
_connection = connection;
_mibMap = mibMap;
_communityString = community;
}
/**
* Initialize the connection. At this point, the current thread is the
* connection thread.
*/
public void init()
{
}
/**
* Return true if the connection should wait for a read before
* handling the request.
*/
public boolean isWaitForRead()
{
return true;
}
public void startConnection()
{
}
/**
* Handles a new connection. The controlling TcpServer may call
* handleConnection again after the connection completes, so
* the implementation must initialize any variables for each connection.
*/
public boolean handleRequest()
throws IOException
{
ReadStream in = _connection.getReadStream();
SnmpParser parser = new SnmpParser(in);
SnmpMessageValue req = parser.readMessage();
checkVersion(req);
authenticate(req);
SnmpMessageValue response = composeResponse(req);
sendResponse(response);
return true;
}
final protected void checkVersion(SnmpMessageValue req)
{
if (! _version.equals(req.getVersion())) {
log.fine(L.l("expected version {0} != {1}",
_version,
req.getVersion()));
throw new SnmpRuntimeException(L.l("expected version {0} != {1}",
_version,
req.getVersion()));
}
}
final protected void authenticate(SnmpMessageValue req)
{
if (! _communityString.equals(req.getCommunityString())) {
log.fine(L.l("non-matching community string"));
throw new SnmpRuntimeException(L.l("non-matching community string"));
}
}
final protected void sendResponse(SnmpValue response)
throws IOException
{
OutputStream out = _connection.getWriteStream();
StringBuilder sb = new StringBuilder();
response.toAsn1(sb);
for (int i = 0; i < sb.length(); i++) {
out.write((byte) sb.charAt(i));
}
out.flush();
}
final protected SnmpMessageValue composeResponse(SnmpMessageValue req)
{
IntegerValue error = IntegerValue.ZERO;
IntegerValue errorIndex = IntegerValue.ZERO;
VarBindListValue varBindList = new VarBindListValue();
int i = -1;
try {
switch (req.getPdu().getType()) {
case SnmpValue.GET_REQUEST_PDU:
{
ObjectIdentifierValue []oids = req.getVarBindList().getNames();
for (i = 0; i < oids.length; i++) {
SnmpValue attr = getMBean(oids[i]);
VarBindValue varBind;
if (attr != null)
varBind = new VarBindValue(oids[i], attr);
else {
varBind = new VarBindValue(oids[i], NullValue.NULL);
if (error.getLong() == 0) {
error = new IntegerValue(NO_SUCH_NAME);
errorIndex = new IntegerValue(i + 1);
}
}
varBindList.add(varBind);
}
break;
}
case SnmpValue.GET_NEXT_REQUEST_PDU: {
ObjectIdentifierValue[] oids = req.getVarBindList().getNames();
for (ObjectIdentifierValue oid : oids) {
String key = _mibMap.higherKey(oid.getString());
if (key == null)
key = _mibMap.ceilingKey(oid.toString());
VarBindValue varBind;
if (key != null) {
ObjectIdentifierValue nextObjIdVal
= new ObjectIdentifierValue(key);
SnmpValue value = getMBean(nextObjIdVal);
varBind = new VarBindValue(nextObjIdVal, value);
}
else {
varBind = new VarBindValue(oid, NullValue.NULL);
if (error.getLong() == 0) {
error = new IntegerValue(NO_SUCH_NAME);
errorIndex = new IntegerValue(i + 1);
}
}
varBindList.add(varBind);
}
break;
}
case SnmpValue.SET_REQUEST_PDU:
{
break;
}
default:
log.fine(L.l("invalid pdu type {0}", req.getType()));
throw new SnmpRuntimeException(L.l("invalid pdu type {0}",
req.getType()));
}
}
catch (Exception e) {
if (error.getLong() == 0) {
error = new IntegerValue(GENERAL_ERROR);
errorIndex = new IntegerValue(i + 1);
}
if (req.getVarBindList().size() > i) {
VarBindValue varBind
= new VarBindValue(req.getVarBindList().get(i).getName(),
new OctetStringValue(e.getMessage()));
varBindList.add(varBind);
}
}
GetResponsePduValue pdu = new GetResponsePduValue(req.getRequestId(),
error,
errorIndex,
varBindList);
return new SnmpMessageValue(req.getVersion(),
req.getCommunityString(),
pdu);
}
//@In MBeanServer _jmx;
protected SnmpValue getMBean(ObjectIdentifierValue objectIdentifier)
{
MBeanServer mbeanServer = getMBeanServer();
Oid oid = _mibMap.get(objectIdentifier.getString());
if (oid == null)
return null;
try {
ObjectName mbean = new ObjectName(oid.getMbean());
Object attr = mbeanServer.getAttribute(mbean, oid.getAttribute());
//XXX: complex attributes that are not either Integer or String
// i.e. from java.lang:type=Memory mbean
return SnmpValue.create(attr, oid.getType());
}
catch (MalformedObjectNameException e) {
log.fine(e.getMessage());
throw new SnmpRuntimeException(e);
}
catch (AttributeNotFoundException e) {
log.fine(e.getMessage());
return null;
}
catch (InstanceNotFoundException e) {
log.fine(e.getMessage());
return null;
}
catch (MBeanException e) {
log.fine(e.getMessage());
throw new SnmpRuntimeException(e);
}
catch (ReflectionException e) {
log.fine(e.getMessage());
throw new SnmpRuntimeException(e);
}
catch (Exception e) {
log.fine(e.getMessage());
return null;
}
}
//@In MBeanServer _jmx;
protected MBeanServer getMBeanServer()
{
return Jmx.getMBeanServer();
}
/**
* Resumes processing after a wait.
*/
public boolean handleResume()
throws IOException
{
return false;
}
/**
* Handles a close event when the connection is closed.
*/
public void onCloseConnection()
{
}
/*
* Sets the SNMP version.
*/
public void setVersion(int version)
{
_version = new IntegerValue(version);
}
public TreeMap getMib()
{
return _mibMap;
}
}
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