opendaylight/netconf/netconf-it/src/test/java/org/opendaylight/controller/netconf/it/NetconfITTest.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.controller.netconf.it;
  10
  11 import ch.ethz.ssh2.Connection;
  12 import ch.ethz.ssh2.Session;
  13 import com.google.common.base.Optional;
  14 import com.google.common.collect.Lists;
  15 import com.google.common.collect.Sets;
  16 import io.netty.channel.ChannelFuture;
  17 import io.netty.channel.EventLoopGroup;
  18 import io.netty.channel.nio.NioEventLoopGroup;
  19 import io.netty.util.HashedWheelTimer;
  20 import java.io.IOException;
  21 import java.io.InputStream;
  22 import java.lang.management.ManagementFactory;
  23 import java.net.InetSocketAddress;
  24 import java.util.ArrayList;
  25 import java.util.Arrays;
  26 import java.util.Collection;
  27 import java.util.List;
  28 import java.util.Set;
  29 import java.util.concurrent.TimeUnit;
  30 import javax.management.ObjectName;
  31 import javax.net.ssl.SSLContext;
  32 import javax.xml.parsers.ParserConfigurationException;
  33 import junit.framework.Assert;
  34 import org.junit.After;
  35 import org.junit.Before;
  36 import org.junit.Ignore;
  37 import org.junit.Test;
  38 import org.opendaylight.controller.config.api.ModuleIdentifier;
  39 import org.opendaylight.controller.config.manager.impl.AbstractConfigTest;
  40 import org.opendaylight.controller.config.manager.impl.factoriesresolver.HardcodedModuleFactoriesResolver;
  41 import org.opendaylight.controller.config.manager.impl.jmx.BaseJMXRegistrator;
  42 import org.opendaylight.controller.config.manager.impl.jmx.RootRuntimeBeanRegistratorImpl;
  43 import org.opendaylight.controller.config.persist.api.Persister;
  44 import org.opendaylight.controller.config.spi.ModuleFactory;
  45 import org.opendaylight.controller.config.util.ConfigTransactionJMXClient;
  46 import org.opendaylight.controller.config.yang.store.api.YangStoreException;
  47 import org.opendaylight.controller.config.yang.store.impl.HardcodedYangStoreService;
  48 import org.opendaylight.controller.config.yang.test.impl.Asdf;
  49 import org.opendaylight.controller.config.yang.test.impl.DepTestImplModuleFactory;
  50 import org.opendaylight.controller.config.yang.test.impl.NetconfTestImplModuleFactory;
  51 import org.opendaylight.controller.config.yang.test.impl.NetconfTestImplModuleMXBean;
  52 import org.opendaylight.controller.config.yang.test.impl.NetconfTestImplRuntimeMXBean;
  53 import org.opendaylight.controller.config.yang.test.impl.NetconfTestImplRuntimeRegistrator;
  54 import org.opendaylight.controller.config.yang.test.impl.TestImplModuleFactory;
  55 import org.opendaylight.controller.netconf.api.NetconfMessage;
  56 import org.opendaylight.controller.netconf.client.NetconfClient;
  57 import org.opendaylight.controller.netconf.client.NetconfClientDispatcher;
  58 import org.opendaylight.controller.netconf.confignetconfconnector.osgi.NetconfOperationServiceFactoryImpl;
  59 import org.opendaylight.controller.netconf.impl.DefaultCommitNotificationProducer;
  60 import org.opendaylight.controller.netconf.impl.NetconfServerDispatcher;
  61 import org.opendaylight.controller.netconf.impl.NetconfServerSessionListenerFactory;
  62 import org.opendaylight.controller.netconf.impl.NetconfServerSessionNegotiatorFactory;
  63 import org.opendaylight.controller.netconf.impl.SessionIdProvider;
  64 import org.opendaylight.controller.netconf.impl.mapping.ExiDecoderHandler;
  65 import org.opendaylight.controller.netconf.impl.mapping.ExiEncoderHandler;
  66 import org.opendaylight.controller.netconf.impl.osgi.NetconfOperationServiceFactoryListenerImpl;
  67 import org.opendaylight.controller.netconf.persist.impl.ConfigPersisterNotificationHandler;
  68 import org.opendaylight.controller.netconf.ssh.NetconfSSHServer;
  69 import org.opendaylight.controller.netconf.util.test.XmlFileLoader;
  70 import org.opendaylight.controller.netconf.util.xml.ExiParameters;
  71 import org.opendaylight.controller.netconf.util.xml.XmlElement;
  72 import org.opendaylight.controller.netconf.util.xml.XmlUtil;
  73 import org.slf4j.Logger;
  74 import org.slf4j.LoggerFactory;
  75 import org.w3c.dom.Document;
  76 import org.w3c.dom.Element;
  77 import org.w3c.dom.NamedNodeMap;
  78 import org.w3c.dom.Node;
  79 import org.xml.sax.SAXException;
  80 import static junit.framework.Assert.assertEquals;
  81 import static junit.framework.Assert.assertNotNull;
  82 import static junit.framework.Assert.assertTrue;
  83 import static org.mockito.Mockito.doReturn;
  84 import static org.mockito.Mockito.mock;
  85 import static org.mockito.internal.util.Checks.checkNotNull;
  86
  87 public class NetconfITTest extends AbstractConfigTest {
  88
  89      private static final Logger logger =  LoggerFactory.getLogger(NetconfITTest.class);
  90     //
  91
  92     private static final InetSocketAddress tcpAddress = new InetSocketAddress("127.0.0.1", 12023);
  93     private static final InetSocketAddress sshAddress = new InetSocketAddress("127.0.0.1", 830);
  94     private static final String USERNAME = "netconf";
  95     private static final String PASSWORD = "netconf";
  96
  97     private NetconfMessage getConfig, getConfigCandidate, editConfig,
  98             closeSession, startExi, stopExi;
  99     private DefaultCommitNotificationProducer commitNot;
 100     private NetconfServerDispatcher dispatch;
 101     private EventLoopGroup nettyThreadgroup;
 102
 103     private NetconfClientDispatcher clientDispatcher;
 104
 105
 106     @Before
 107     public void setUp() throws Exception {
 108         super.initConfigTransactionManagerImpl(new HardcodedModuleFactoriesResolver(getModuleFactories().toArray(
 109                 new ModuleFactory[0])));
 110
 111         loadMessages();
 112
 113         NetconfOperationServiceFactoryListenerImpl factoriesListener = new NetconfOperationServiceFactoryListenerImpl();
 114         factoriesListener.onAddNetconfOperationServiceFactory(new NetconfOperationServiceFactoryImpl(getYangStore()));
 115
 116         nettyThreadgroup = new NioEventLoopGroup();
 117
 118         commitNot = new DefaultCommitNotificationProducer(ManagementFactory.getPlatformMBeanServer());
 119
 120         dispatch = createDispatcher(Optional.<SSLContext> absent(), factoriesListener);
 121         ChannelFuture s = dispatch.createServer(tcpAddress);
 122         s.await();
 123
 124         clientDispatcher = new NetconfClientDispatcher(Optional.<SSLContext>absent(), nettyThreadgroup, nettyThreadgroup);
 125     }
 126
 127     private NetconfServerDispatcher createDispatcher(Optional<SSLContext> sslC,
 128             NetconfOperationServiceFactoryListenerImpl factoriesListener) {
 129         SessionIdProvider idProvider = new SessionIdProvider();
 130         NetconfServerSessionNegotiatorFactory serverNegotiatorFactory = new NetconfServerSessionNegotiatorFactory(
 131                 new HashedWheelTimer(5000, TimeUnit.MILLISECONDS), factoriesListener, idProvider);
 132
 133         NetconfServerSessionListenerFactory listenerFactory = new NetconfServerSessionListenerFactory(
 134                 factoriesListener, commitNot, idProvider);
 135
 136         NetconfServerDispatcher.ServerSslChannelInitializer serverChannelInitializer = new NetconfServerDispatcher.ServerSslChannelInitializer(
 137                 sslC, serverNegotiatorFactory, listenerFactory);
 138         return new NetconfServerDispatcher(serverChannelInitializer, nettyThreadgroup, nettyThreadgroup);
 139     }
 140
 141     @After
 142     public void tearDown() throws Exception {
 143         commitNot.close();
 144         nettyThreadgroup.shutdownGracefully();
 145         clientDispatcher.close();
 146     }
 147
 148     private void loadMessages() throws IOException, SAXException, ParserConfigurationException {
 149         this.editConfig = XmlFileLoader.xmlFileToNetconfMessage("netconfMessages/edit_config.xml");
 150         this.getConfig = XmlFileLoader.xmlFileToNetconfMessage("netconfMessages/getConfig.xml");
 151         this.getConfigCandidate = XmlFileLoader.xmlFileToNetconfMessage("netconfMessages/getConfig_candidate.xml");
 152         this.startExi = XmlFileLoader
 153                 .xmlFileToNetconfMessage("netconfMessages/startExi.xml");
 154         this.stopExi = XmlFileLoader
 155                 .xmlFileToNetconfMessage("netconfMessages/stopExi.xml");
 156         this.closeSession = XmlFileLoader.xmlFileToNetconfMessage("netconfMessages/closeSession.xml");
 157     }
 158
 159     private HardcodedYangStoreService getYangStore() throws YangStoreException, IOException {
 160         final Collection<InputStream> yangDependencies = getBasicYangs();
 161         return new HardcodedYangStoreService(yangDependencies);
 162     }
 163
 164     static Collection<InputStream> getBasicYangs() throws IOException {
 165         List<String> paths = Arrays.asList("/META-INF/yang/config.yang", "/META-INF/yang/rpc-context.yang",
 166                 "/META-INF/yang/config-test.yang", "/META-INF/yang/config-test-impl.yang",
 167                 "/META-INF/yang/ietf-inet-types.yang");
 168         final Collection<InputStream> yangDependencies = new ArrayList<>();
 169         for (String path : paths) {
 170             final InputStream is = checkNotNull(NetconfITTest.class.getResourceAsStream(path), path + " not found");
 171             yangDependencies.add(is);
 172         }
 173         return yangDependencies;
 174     }
 175
 176     protected List<ModuleFactory> getModuleFactories() {
 177         return getModuleFactoriesS();
 178     }
 179     static List<ModuleFactory> getModuleFactoriesS() {
 180         return Lists.newArrayList(new TestImplModuleFactory(), new DepTestImplModuleFactory(),
 181                 new NetconfTestImplModuleFactory());
 182     }
 183
 184     @Test
 185     public void testNetconfClientDemonstration() throws Exception {
 186         try (NetconfClient netconfClient = new NetconfClient("client", tcpAddress, 4000, clientDispatcher)) {
 187
 188             Set<String> capabilitiesFromNetconfServer = netconfClient.getCapabilities();
 189             long sessionId = netconfClient.getSessionId();
 190
 191             // NetconfMessage can be created :
 192             // new NetconfMessage(XmlUtil.readXmlToDocument("<xml/>"));
 193
 194             NetconfMessage response = netconfClient.sendMessage(getConfig);
 195             response.getDocument();
 196         }
 197     }
 198
 199     @Test
 200     public void testTwoSessions() throws Exception {
 201         try (NetconfClient netconfClient = new NetconfClient("1", tcpAddress, 4000, clientDispatcher))  {
 202             try (NetconfClient netconfClient2 = new NetconfClient("2", tcpAddress, 4000, clientDispatcher))  {
 203             }
 204         }
 205     }
 206
 207     @Test(timeout = 10000)
 208     public void testPersister() throws Exception {
 209         Persister persister = mock(Persister.class);
 210         doReturn("mockPersister").when(persister).toString();
 211         doReturn(Optional.absent()).when(persister).loadLastConfig();
 212         ConfigPersisterNotificationHandler h = new ConfigPersisterNotificationHandler(persister, tcpAddress, ManagementFactory.getPlatformMBeanServer());
 213         h.init();
 214     }
 215
 216     @Ignore
 217     @Test
 218     public void waitingTest() throws Exception {
 219         final ConfigTransactionJMXClient transaction = this.configRegistryClient.createTransaction();
 220         transaction.createModule(DepTestImplModuleFactory.NAME, "eb");
 221         transaction.commit();
 222         Thread.currentThread().suspend();
 223     }
 224
 225     @Test
 226     public void rpcReplyContainsAllAttributesTest() throws Exception {
 227         try (NetconfClient netconfClient = createSession(tcpAddress, "1")) {
 228             final String rpc = "<rpc message-id=\"5\" a=\"a\" b=\"44\" xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\">"
 229                     + "<get/>" + "</rpc>";
 230             final Document doc = XmlUtil.readXmlToDocument(rpc);
 231             final NetconfMessage message = netconfClient.sendMessage(new NetconfMessage(doc));
 232             assertNotNull(message);
 233             final NamedNodeMap expectedAttributes = doc.getDocumentElement().getAttributes();
 234             final NamedNodeMap returnedAttributes = message.getDocument().getDocumentElement().getAttributes();
 235
 236             assertSameAttributes(expectedAttributes, returnedAttributes);
 237         }
 238     }
 239
 240     private void assertSameAttributes(final NamedNodeMap expectedAttributes, final NamedNodeMap returnedAttributes) {
 241         assertNotNull("Expecting 4 attributes", returnedAttributes);
 242         assertEquals(expectedAttributes.getLength(), returnedAttributes.getLength());
 243
 244         for (int i = 0; i < expectedAttributes.getLength(); i++) {
 245             final Node expAttr = expectedAttributes.item(i);
 246             final Node attr = returnedAttributes.item(i);
 247             assertEquals(expAttr.getNodeName(), attr.getNodeName());
 248             assertEquals(expAttr.getNamespaceURI(), attr.getNamespaceURI());
 249             assertEquals(expAttr.getTextContent(), attr.getTextContent());
 250         }
 251     }
 252
 253     @Test
 254     public void rpcReplyErrorContainsAllAttributesTest() throws Exception {
 255         try (NetconfClient netconfClient = createSession(tcpAddress, "1")) {
 256             final String rpc = "<rpc message-id=\"1\" a=\"adada\" b=\"4\" xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\">"
 257                     + "<commit/>" + "</rpc>";
 258             final Document doc = XmlUtil.readXmlToDocument(rpc);
 259             final NetconfMessage message = netconfClient.sendMessage(new NetconfMessage(doc));
 260             final NamedNodeMap expectedAttributes = doc.getDocumentElement().getAttributes();
 261             final NamedNodeMap returnedAttributes = message.getDocument().getDocumentElement().getAttributes();
 262
 263             assertSameAttributes(expectedAttributes, returnedAttributes);
 264         }
 265     }
 266
 267     @Test
 268     public void rpcOutputContainsCorrectNamespace() throws Exception {
 269         final ConfigTransactionJMXClient transaction = this.configRegistryClient.createTransaction();
 270         ObjectName dep = transaction.createModule(DepTestImplModuleFactory.NAME, "instanceD");
 271         ObjectName impl = transaction.createModule(NetconfTestImplModuleFactory.NAME, "instance");
 272         NetconfTestImplModuleMXBean proxy = configRegistryClient
 273                 .newMXBeanProxy(impl, NetconfTestImplModuleMXBean.class);
 274         proxy.setTestingDep(dep);
 275         registerRuntimeBean();
 276
 277         transaction.commit();
 278
 279         try (NetconfClient netconfClient = createSession(tcpAddress, "1")) {
 280             final String expectedNamespace = "urn:opendaylight:params:xml:ns:yang:controller:test:impl";
 281
 282             final String rpc = "<rpc message-id=\"5\" xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\">"
 283                     + "<no-arg xmlns=\""
 284                     + expectedNamespace
 285                     + "\">    "
 286                     + "<context-instance>/modules/module[type='impl-netconf'][name='instance']</context-instance>"
 287                     + "<arg1>argument1</arg1>" + "</no-arg>" + "</rpc>";
 288             final Document doc = XmlUtil.readXmlToDocument(rpc);
 289             final NetconfMessage message = netconfClient.sendMessage(new NetconfMessage(doc));
 290
 291             final Element rpcReply = message.getDocument().getDocumentElement();
 292             final XmlElement resultElement = XmlElement.fromDomElement(rpcReply).getOnlyChildElement();
 293             assertEquals("result", resultElement.getName());
 294
 295             final String namespace = resultElement.getNamespaceAttribute();
 296             assertEquals(expectedNamespace, namespace);
 297         }
 298     }
 299
 300     private void registerRuntimeBean() {
 301         BaseJMXRegistrator baseJMXRegistrator = new BaseJMXRegistrator(ManagementFactory.getPlatformMBeanServer());
 302         RootRuntimeBeanRegistratorImpl runtimeBeanRegistrator = baseJMXRegistrator
 303                 .createRuntimeBeanRegistrator(new ModuleIdentifier(NetconfTestImplModuleFactory.NAME, "instance"));
 304         NetconfTestImplRuntimeRegistrator reg = new NetconfTestImplRuntimeRegistrator(runtimeBeanRegistrator);
 305         reg.register(new NetconfTestImplRuntimeMXBean() {
 306             @Override
 307             public Asdf getAsdf() {
 308                 return null;
 309             }
 310
 311             @Override
 312             public Long getCreatedSessions() {
 313                 return null;
 314             }
 315
 316             @Override
 317             public String noArg(String arg1) {
 318                 return "from no arg";
 319             }
 320         });
 321     }
 322
 323     @Test
 324 //    @Ignore
 325     public void testStartExi() throws Exception {
 326         try (NetconfClient netconfClient = createSession(tcpAddress, "1")) {
 327
 328
 329             Document rpcReply = netconfClient.sendMessage(this.startExi)
 330                     .getDocument();
 331             assertIsOK(rpcReply);
 332
 333             ExiParameters exiParams = new ExiParameters();
 334             exiParams.setParametersFromXmlElement(XmlElement.fromDomDocument(this.startExi.getDocument()));
 335
 336             netconfClient.getClientSession().addExiDecoder(ExiDecoderHandler.HANDLER_NAME, new ExiDecoderHandler(exiParams));
 337             netconfClient.getClientSession().addExiEncoder(ExiEncoderHandler.HANDLER_NAME, new ExiEncoderHandler(exiParams));
 338
 339             rpcReply = netconfClient.sendMessage(this.editConfig)
 340                     .getDocument();
 341             assertIsOK(rpcReply);
 342
 343             rpcReply = netconfClient.sendMessage(this.stopExi)
 344                     .getDocument();
 345             assertIsOK(rpcReply);
 346
 347         }
 348     }
 349
 350     @Test
 351     public void testCloseSession() throws Exception {
 352         try (NetconfClient netconfClient = createSession(tcpAddress, "1")) {
 353
 354             // edit config
 355             Document rpcReply = netconfClient.sendMessage(this.editConfig)
 356                     .getDocument();
 357             assertIsOK(rpcReply);
 358
 359             rpcReply = netconfClient.sendMessage(this.closeSession)
 360                     .getDocument();
 361
 362             assertIsOK(rpcReply);
 363         }
 364     }
 365
 366     @Test
 367     public void testEditConfig() throws Exception {
 368         try (NetconfClient netconfClient = createSession(tcpAddress, "1")) {
 369             // send edit_config.xml
 370             final Document rpcReply = netconfClient.sendMessage(this.editConfig).getDocument();
 371             assertIsOK(rpcReply);
 372         }
 373     }
 374
 375     @Test
 376     public void testValidate() throws Exception {
 377         try (NetconfClient netconfClient = createSession(tcpAddress, "1")) {
 378             // begin transaction
 379             Document rpcReply = netconfClient.sendMessage(getConfigCandidate).getDocument();
 380             assertEquals("data", XmlElement.fromDomDocument(rpcReply).getOnlyChildElement().getName());
 381
 382             // operations empty
 383             rpcReply = netconfClient.sendMessage(XmlFileLoader.xmlFileToNetconfMessage("netconfMessages/validate.xml"))
 384                     .getDocument();
 385             assertIsOK(rpcReply);
 386         }
 387     }
 388
 389     private void assertIsOK(final Document rpcReply) {
 390         assertEquals("rpc-reply", rpcReply.getDocumentElement().getLocalName());
 391         assertEquals("ok", XmlElement.fromDomDocument(rpcReply).getOnlyChildElement().getName());
 392     }
 393
 394     @Ignore
 395     @Test
 396     // TODO can only send NetconfMessage - it must be valid xml
 397     public void testClientHelloWithAuth() throws Exception {
 398         final String fileName = "netconfMessages/client_hello_with_auth.xml";
 399         // final InputStream resourceAsStream =
 400         // AbstractListenerTest.class.getResourceAsStream(fileName);
 401         // assertNotNull(resourceAsStream);
 402         try (NetconfClient netconfClient = new NetconfClient("test", tcpAddress, 5000, clientDispatcher)) {
 403             // IOUtils.copy(resourceAsStream, netconfClient.getStream());
 404             // netconfClient.getOutputStream().write(NetconfMessageFactory.endOfMessage);
 405             // server should not write anything back
 406             // assertEquals(null, netconfClient.readMessage());
 407             assertGetConfigWorks(netconfClient);
 408         }
 409     }
 410
 411     private Document assertGetConfigWorks(final NetconfClient netconfClient) throws InterruptedException {
 412         return assertGetConfigWorks(netconfClient, this.getConfig);
 413     }
 414
 415     private Document assertGetConfigWorks(final NetconfClient netconfClient, final NetconfMessage getConfigMessage)
 416             throws InterruptedException {
 417         final NetconfMessage rpcReply = netconfClient.sendMessage(getConfigMessage);
 418         assertNotNull(rpcReply);
 419         assertEquals("data", XmlElement.fromDomDocument(rpcReply.getDocument()).getOnlyChildElement().getName());
 420         return rpcReply.getDocument();
 421     }
 422
 423     @Test
 424     public void testGetConfig() throws Exception {
 425         try (NetconfClient netconfClient = createSession(tcpAddress, "1")) {
 426             assertGetConfigWorks(netconfClient);
 427         }
 428     }
 429
 430     @Test
 431     public void createYangTestBasedOnYuma() throws Exception {
 432         try (NetconfClient netconfClient = createSession(tcpAddress, "1")) {
 433             Document rpcReply = netconfClient.sendMessage(
 434                     XmlFileLoader.xmlFileToNetconfMessage("netconfMessages/editConfig_merge_yang-test.xml"))
 435                     .getDocument();
 436             assertEquals("rpc-reply", rpcReply.getDocumentElement().getTagName());
 437             assertIsOK(rpcReply);
 438             assertGetConfigWorks(netconfClient, this.getConfigCandidate);
 439             rpcReply = netconfClient.sendMessage(XmlFileLoader.xmlFileToNetconfMessage("netconfMessages/commit.xml"))
 440                     .getDocument();
 441             assertIsOK(rpcReply);
 442
 443             final ObjectName on = new ObjectName(
 444                     "org.opendaylight.controller:instanceName=impl-dep-instance,type=Module,moduleFactoryName=impl-dep");
 445             Set<ObjectName> cfgBeans = configRegistryClient.lookupConfigBeans();
 446             assertEquals(cfgBeans, Sets.newHashSet(on));
 447         }
 448     }
 449
 450     private NetconfClient createSession(final InetSocketAddress address, final String expected) throws Exception {
 451         final NetconfClient netconfClient = new NetconfClient("test " + address.toString(), address, 5000, clientDispatcher);
 452         assertEquals(expected, Long.toString(netconfClient.getSessionId()));
 453         return netconfClient;
 454     }
 455
 456     private class TestSSHServer implements Runnable {
 457         public void run()  {
 458             try {
 459                 NetconfSSHServer.start();
 460             } catch (Exception e) {
 461                 logger.info(e.getMessage());
 462             }
 463         }
 464     }
 465     private void startSSHServer() throws Exception{
 466         logger.info("Creating SSH server");
 467         Thread sshServerThread = new Thread(new TestSSHServer());
 468         sshServerThread.setDaemon(true);
 469         sshServerThread.start();
 470         logger.info("SSH server on");
 471     }
 472
 473     @Test
 474     public void sshTest() throws Exception {
 475         startSSHServer();
 476         Connection conn = new Connection(sshAddress.getHostName(),sshAddress.getPort());
 477         Assert.assertNotNull(conn);
 478         try {
 479             conn.connect();
 480             boolean isAuthenticated = conn.authenticateWithPassword(USERNAME,PASSWORD);
 481             assertTrue(isAuthenticated);
 482             Session sess = conn.openSession();
 483             sess.startSubSystem("netconf");
 484 //            sess.requestPTY("");
 485         } catch (IOException e) {
 486             e.printStackTrace();
 487         }
 488     }
 489
 490
 491 }