com.jcraft.jsch.ChannelExec Java Examples

/**
 * Connect to a remote host via SSH and execute a command.
 * 
 * @param host
 *          Host to connect to
 * @param user
 *          User to login with
 * @param password
 *          Password for the user
 * @param command
 *          Command to execute
 * @return The result of the command execution
 */
private Result executeSshCommand(final String host, final String user,
    final String password, final String command) {
  
  StringBuilder result = new StringBuilder();
  
  try {
    JSch jsch = new JSch();
    Session session = jsch.getSession(user, host, 22);
    session.setUserInfo(createUserInfo(password));
    session.connect(5000);

    ChannelExec channel = (ChannelExec) session.openChannel("exec");
    channel.setCommand(command);
    channel.setInputStream(null);
    channel.setErrStream(System.err);
    InputStream in = channel.getInputStream();

    channel.connect();

    byte[] tmp = new byte[1024];
    while (true) {
      while (in.available() > 0) {
        int i = in.read(tmp, 0, 1024);
        if (i < 0)
          break;
        result.append(new String(tmp, 0, i));
      }
      if (channel.isClosed()) {
        break;
      }
    }
    channel.disconnect();
    session.disconnect();
  } catch (Exception jex) {
    return createResult(Result.Status.ERROR, jex.getMessage());
  }
 
  return createResult(Result.Status.OK, result.toString());
}
 

@Test
@SuppressWarnings("PMD.SignatureDeclareThrowsException")
public void shouldExecuteSuccessfullyWithoutAgentForwarding() throws Exception
{
    ServerConfiguration server = getDefaultServerConfiguration();
    JSch jSch = mock(JSch.class);
    whenNew(JSch.class).withNoArguments().thenReturn(jSch);
    Session session = mock(Session.class);
    when(jSch.getSession(server.getUsername(), server.getHost(), server.getPort())).thenReturn(session);
    ChannelExec channelExec = mockChannelOpening(session);
    SshOutput actual = new TestJSchExecutor().execute(server, COMMANDS);
    assertEquals(SSH_OUTPUT, actual);
    InOrder ordered = inOrder(jSch, session, channelExec);
    ordered.verify(jSch).addIdentity(IDENTITY_NAME, server.getPrivateKey().getBytes(StandardCharsets.UTF_8),
            server.getPublicKey().getBytes(StandardCharsets.UTF_8),
            server.getPassphrase().getBytes(StandardCharsets.UTF_8));
    verifyFullConnection(ordered, server, session, channelExec);
}
 

public ChannelExecWrapper( Session session, String command, InputStream stdIn, OutputStream stdOut, OutputStream stdErr ) throws JSchException, IOException {
    this.command = command;
    this.channel = (ChannelExec) session.openChannel( "exec" );
    if ( stdIn != null ) {
        this.passedInStdIn = stdIn;
        this.channel.setInputStream( stdIn );
    }
    if ( stdOut != null ) {
        this.passedInStdOut = stdOut;
        this.channel.setOutputStream( stdOut );
    }
    if ( stdErr != null ) {
        this.passedInStdErr = stdErr;
        this.channel.setErrStream( stdErr );
    }
    this.channel.setCommand( command );
    this.channel.connect();
}
 

@Test
@SuppressWarnings("PMD.SignatureDeclareThrowsException")
public void shouldExecuteSuccessfullyWithAgentForwarding() throws Exception
{
    ServerConfiguration server = getDefaultServerConfiguration();
    server.setAgentForwarding(true);
    JSch jSch = mock(JSch.class);
    whenNew(JSch.class).withNoArguments().thenReturn(jSch);
    mockStatic(ConnectorFactory.class);
    ConnectorFactory connectorFactory = mock(ConnectorFactory.class);
    when(ConnectorFactory.getDefault()).thenReturn(connectorFactory);
    Connector connector = mock(Connector.class);
    when(connectorFactory.createConnector()).thenReturn(connector);
    RemoteIdentityRepository remoteIdentityRepository = mock(RemoteIdentityRepository.class);
    whenNew(RemoteIdentityRepository.class).withArguments(connector).thenReturn(remoteIdentityRepository);
    doNothing().when(jSch).setIdentityRepository(remoteIdentityRepository);
    Session session = mock(Session.class);
    when(jSch.getSession(server.getUsername(), server.getHost(), server.getPort())).thenReturn(session);
    ChannelExec channelExec = mockChannelOpening(session);
    SshOutput actual = new TestJSchExecutor().execute(server, COMMANDS);
    assertEquals(SSH_OUTPUT, actual);
    InOrder ordered = inOrder(jSch, session, channelExec);
    ordered.verify(jSch).setIdentityRepository(remoteIdentityRepository);
    verifyFullConnection(ordered, server, session, channelExec);
}
 

@Test
@SuppressWarnings("PMD.SignatureDeclareThrowsException")
public void shouldFailOnCommandExecutionError() throws Exception
{
    ServerConfiguration server = getDefaultServerConfiguration();
    server.setPublicKey(null);
    JSch jSch = mock(JSch.class);
    whenNew(JSch.class).withNoArguments().thenReturn(jSch);
    Session session = mock(Session.class);
    when(jSch.getSession(server.getUsername(), server.getHost(), server.getPort())).thenReturn(session);
    ChannelExec channelExec = mockChannelOpening(session);
    JSchException jSchException = new JSchException();
    CommandExecutionException exception = assertThrows(CommandExecutionException.class,
        () -> new TestJSchExecutor()
        {
            @Override
            protected SshOutput executeCommand(ServerConfiguration serverConfig, Commands commands,
                    ChannelExec channel) throws JSchException
            {
                throw jSchException;
            }
        }.execute(server, COMMANDS));
    assertEquals(jSchException, exception.getCause());
    InOrder ordered = inOrder(jSch, session, channelExec);
    verifyFullConnection(ordered, server, session, channelExec);
}
 

@Override
protected SshOutput executeCommand(ServerConfiguration serverConfig, Commands commands, ChannelExec channel)
        throws JSchException, IOException
{
    channel.setAgentForwarding(serverConfig.isAgentForwarding());
    SshOutput executionOutput = new SshOutput();
    try (ByteArrayOutputStream errorStream = new ByteArrayOutputStream())
    {
        channel.setCommand(commands.getJoinedCommands());
        channel.setErrStream(errorStream);
        channel.connect();
        executionOutput.setOutputStream(readChannelInputStream(channel));
        executionOutput.setErrorStream(new String(errorStream.toByteArray(), StandardCharsets.UTF_8));
        executionOutput.setExitStatus(channel.getExitStatus());
    }
    return executionOutput;
}
 

/**
 * Wait for a given {@link ChannelExec} to be closed.
 * Will close channel if maxWait is set and exceeded.
 * @param channel the channel
 */
private void waitForChannelClosed(ChannelExec channel) {
    long startTime = System.currentTimeMillis();
    while (!channel.isClosed()) {
        // Check to see if we have been waiting too long, converts ms to minutes
        long elapsedTimeInMins =
                TimeUnit.MILLISECONDS.toMinutes(System.currentTimeMillis() - startTime);
        if (maxWait > 0 && elapsedTimeInMins > maxWait) {
            log.error("Task took too long to complete");
            channel.disconnect();
        }
        try {
            Thread.sleep(1000);
        }
        catch (InterruptedException e) {
            // Should not happen
        }
    }
}
 

private boolean executeSSH(){ 
	//get deployment descriptor, instead of this hard coded.
	// or execute a script on the target machine which download artifact from nexus
       String command ="nohup java -jar -Dserver.port=8091 ./work/codebox/chapter6/chapter6.search/target/search-1.0.jar &";
      try{	
   	   System.out.println("Executing "+ command);
          java.util.Properties config = new java.util.Properties(); 
          config.put("StrictHostKeyChecking", "no");
          JSch jsch = new JSch();
          Session session=jsch.getSession("rajeshrv", "localhost", 22);
          session.setPassword("rajeshrv");
          
          session.setConfig(config);
          session.connect();
          System.out.println("Connected");
           
          ChannelExec channelExec = (ChannelExec)session.openChannel("exec");
          InputStream in = channelExec.getInputStream();
          channelExec.setCommand(command);
          channelExec.connect();
         
          BufferedReader reader = new BufferedReader(new InputStreamReader(in));
          String line;
          int index = 0;

          while ((line = reader.readLine()) != null) {
              System.out.println(++index + " : " + line);
          }
          channelExec.disconnect();
          session.disconnect();

          System.out.println("Done!");

      }catch(Exception e){
          e.printStackTrace();
          return false;
      }
	
	return true;
}
 

@Test
public void testSecureCopyFile() throws JSchException, IOException {
    final JschBuilder mockJschBuilder = mock(JschBuilder.class);
    final JSch mockJsch = mock(JSch.class);
    final Session mockSession = mock(Session.class);
    final ChannelExec mockChannelExec = mock(ChannelExec.class);
    final byte [] bytes = {0};
    final ByteArrayOutputStream out = new ByteArrayOutputStream();
    when(mockChannelExec.getInputStream()).thenReturn(new TestInputStream());
    when(mockChannelExec.getOutputStream()).thenReturn(out);
    when(mockSession.openChannel(eq("exec"))).thenReturn(mockChannelExec);
    when(mockJsch.getSession(anyString(), anyString(), anyInt())).thenReturn(mockSession);
    when(mockJschBuilder.build()).thenReturn(mockJsch);
    when(Config.mockSshConfig.getJschBuilder()).thenReturn(mockJschBuilder);
    when(Config.mockRemoteCommandExecutorService.executeCommand(any(RemoteExecCommand.class))).thenReturn(mock(RemoteCommandReturnInfo.class));
    final String source = BinaryDistributionControlServiceImplTest.class.getClassLoader().getResource("binarydistribution/copy.txt").getPath();
    binaryDistributionControlService.secureCopyFile("someHost", source, "./build/tmp");
    verify(Config.mockSshConfig).getJschBuilder();
    assertEquals("C0644 12 copy.txt\nsome content\0", out.toString(StandardCharsets.UTF_8));
}
 

/**
 * Connect to a remote host and return a channel (session and jsch are set)
 */
Channel connect(String channleType, String sshCommand) throws Exception {
	JSch.setConfig("StrictHostKeyChecking", "no"); // Not recommended, but useful
	jsch = new JSch();

	// Some "reasonable" defaults
	if (Gpr.exists(defaultKnownHosts)) jsch.setKnownHosts(defaultKnownHosts);
	for (String identity : defaultKnownIdentity)
		if (Gpr.exists(identity)) jsch.addIdentity(identity);

	// Create session and connect
	if (debug) Gpr.debug("Create conection:\n\tuser: '" + host.getUserName() + "'\n\thost : '" + host.getHostName() + "'\n\tport : " + host.getPort());
	session = jsch.getSession(host.getUserName(), host.getHostName(), host.getPort());
	session.setUserInfo(new SshUserInfo());
	session.connect();

	// Create channel
	channel = session.openChannel(channleType);
	if ((sshCommand != null) && (channel instanceof ChannelExec)) ((ChannelExec) channel).setCommand(sshCommand);

	return channel;
}
 

/**
 * Force create directories, if it exists it won't do anything
 *
 * @param path
 * @throws IOException
 * @throws RuntimeConfigurationException
 */
private void forceCreateDirectories(@NotNull final String path) throws IOException, RuntimeConfigurationException {
    Session session = connect(ssh.get());
    try {
        ChannelExec channelExec = (ChannelExec) session.openChannel("exec");
        List<String> commands = Arrays.asList(
                String.format("mkdir -p %s", path),
                String.format("cd %s", path),
                String.format("mkdir -p %s", FileUtilities.CLASSES),
                String.format("mkdir -p %s", FileUtilities.LIB),
                String.format("cd %s", path + FileUtilities.SEPARATOR + FileUtilities.CLASSES),
                "rm -rf *"
        );
        for (String command : commands) {
            consoleView.print(EmbeddedLinuxJVMBundle.getString("pi.deployment.command") + command + NEW_LINE, ConsoleViewContentType.SYSTEM_OUTPUT);
        }
        channelExec.setCommand(LinuxCommand.builder().commands(commands).build().toString());
        channelExec.connect();
        channelExec.disconnect();
    } catch (JSchException e) {
        setErrorOnUI(e.getMessage());
    }
}
 

/**
 * Runs that java app with the specified command and then takes the console output from target to host machine
 *
 * @param path
 * @param cmd
 * @throws IOException
 */
private void runJavaApp(@NotNull final String path, @NotNull final String cmd) throws IOException, RuntimeConfigurationException {
    consoleView.print(NEW_LINE + EmbeddedLinuxJVMBundle.getString("pi.deployment.build") + NEW_LINE + NEW_LINE, ConsoleViewContentType.SYSTEM_OUTPUT);
    Session session = connect(ssh.get());
    consoleView.setSession(session);
    try {
        ChannelExec channelExec = (ChannelExec) session.openChannel("exec");
        channelExec.setOutputStream(System.out, true);
        channelExec.setErrStream(System.err, true);
        List<String> commands = Arrays.asList(
                String.format("%s kill -9 $(ps -efww | grep \"%s\"| grep -v grep | tr -s \" \"| cut -d\" \" -f2)", params.isRunAsRoot() ? "sudo" : "", params.getMainclass()),
                String.format("cd %s", path),
                String.format("tar -xvf %s.tar", consoleView.getProject().getName()),
                "rm *.tar",
                cmd);
        for (String command : commands) {
            consoleView.print(EmbeddedLinuxJVMBundle.getString("pi.deployment.command") + command + NEW_LINE, ConsoleViewContentType.SYSTEM_OUTPUT);
        }
        channelExec.setCommand(LinuxCommand.builder().commands(commands).build().toString());
        channelExec.connect();
        checkOnProcess(channelExec);
    } catch (JSchException e) {
        setErrorOnUI(e.getMessage());
    }
}
 

@Test
public void sessionConnectGenerateChannelTestWithSuperUser() {

    Session session = mock(Session.class);
    ChannelExec channel = mock(ChannelExec.class);
    OutputStream out = mock(OutputStream.class);
    
    sshProvider = new SshProvider(sshMetaPasswordSuperUser, hostIpSample);
    try {

        when(session.openChannel("exec")).thenReturn(channel);
        when(channel.getOutputStream()).thenReturn(out);
        sshProvider.sessionConnectGenerateChannel(session);

    } catch (Exception e) {
        e.printStackTrace();
    }
}
 

@Test
public void testExecuteAndGenResponse() {

    // ResponseOnSingeReq (Channel channel) {
    ResponseOnSingeRequest sshResponse = new ResponseOnSingeRequest();
    ChannelExec channel = mock(ChannelExec.class);

    sshProvider = new SshProvider(sshMetaKey, hostIpSample);

    String stdoutStr = "Mon Sep 14 21:52:27 UTC 2015";
    InputStream in = new ByteArrayInputStream(
            stdoutStr.getBytes(Charsets.UTF_8));

    try {
        when(channel.getInputStream()).thenReturn(in);
        when(channel.isClosed()).thenReturn(false).thenReturn(true);
        sshResponse = sshProvider.executeAndGenResponse(channel);
    } catch (IOException e) {
        e.printStackTrace();
    }
    logger.info(sshResponse.toString());
}
 

@Test
public void executeAndGenResponseThrowsExceptionTest() {

    // ResponseOnSingeReq (Channel channel) {
    ResponseOnSingeRequest sshResponse = new ResponseOnSingeRequest();
    ChannelExec channel = mock(ChannelExec.class);
    sshProvider = new SshProvider(sshMetaKey, hostIpSample);
    String stdoutStr = "Mon Sep 14 21:52:27 UTC 2015";
    InputStream in = new ByteArrayInputStream(
            stdoutStr.getBytes(Charsets.UTF_8));

    try {
        when(channel.getInputStream()).thenReturn(in);
        when(channel.isClosed()).thenReturn(false).thenThrow(
                new RuntimeException("fake exception"));
        sshResponse = sshProvider.executeAndGenResponse(channel);
    } catch (Throwable e) {
        logger.info("expected exception {}", "String", e);
    }

    logger.info(sshResponse.toString());
}
 

/**
 * Download a file from the remote server into an OutputStream
 *
 * @param remoteFile
 *            Path and name of the remote file.
 * @param localTarget
 *            OutputStream to store the data.
 * @throws IOException
 *             in case of network problems
 * @throws RemoteScpException
 *             in case of problems on the target system (connection ok)
 */
@SuppressWarnings("unused")
public void get(String remoteFile, OutputStream localTarget) throws IOException,
        RemoteScpException {
    ChannelExec channel = null;

    if (remoteFile == null || localTarget == null) {
        throw new IllegalArgumentException("Null argument.");
    }

    String cmd = "scp -p -f " + remoteFile;

    try {
        channel = getExecChannel();
        channel.setCommand(cmd);
        receiveStream(channel, remoteFile, localTarget);
        channel.disconnect();
    } catch (JSchException e) {
        if (channel != null) {
            channel.disconnect();
        }
        throw new IOException("Error during SCP transfer. " + e.getMessage(), e);
    }
}
 

/**
 * Initiates an SCP sequence but stops after getting fileinformation header
 *
 * @param remoteFile
 *            to get information for
 * @return the file information got
 * @throws IOException
 *             in case of network problems
 * @throws RemoteScpException
 *             in case of problems on the target system (connection ok)
 */
public FileInfo getFileinfo(String remoteFile) throws IOException, RemoteScpException {
    ChannelExec channel = null;
    FileInfo fileInfo = null;

    if (remoteFile == null) {
        throw new IllegalArgumentException("Null argument.");
    }

    String cmd = "scp -p -f \"" + remoteFile + "\"";

    try {
        channel = getExecChannel();
        channel.setCommand(cmd);
        fileInfo = receiveStream(channel, remoteFile, null);
        channel.disconnect();
    } catch (JSchException e) {
        throw new IOException("Error during SCP transfer. " + e.getMessage(), e);
    } finally {
        if (channel != null) {
            channel.disconnect();
        }
    }
    return fileInfo;
}
 

/**
 * This method execute the given command over SSH
 * 
 * @param session
 * @param command
 *            Command to be executed
 * @throws JSchException
 * @throws IOException
 * @throws InterruptedException
 */
static String executeCommand(Session session, String command) throws JSchException, IOException {
	InputStream in = null;
	Channel channel = null;
	String msg = null;
	try {
		channel = session.openChannel("exec");
		((ChannelExec) channel).setCommand(command);
		channel.setInputStream(null);
		((ChannelExec) channel).setErrStream(System.err);
		in = channel.getInputStream();
		channel.connect();
		msg = validateCommandExecution(channel, in);
	} catch (InterruptedException e) {
		CONSOLE_LOGGER.error(e);
	} finally {
		if (in != null) {
			in.close();
		}
		if (channel != null) {
			channel.disconnect();
		}
	}
	return msg;
}
 

/**
 * finally: will close the connection.
 *
 * @return the response on singe request
 */
public ResponseOnSingeRequest executeSshCommand() {
    ResponseOnSingeRequest sshResponse = new ResponseOnSingeRequest();

    try {
        session = startSshSessionAndObtainSession();
        channel = sessionConnectGenerateChannel(session);
        sshResponse = executeAndGenResponse((ChannelExec) channel);

    } catch (Exception e) {
        sshResponse = genErrorResponse(e);
    } finally {

        if (session != null)
            session.disconnect();
        if (channel != null)
            channel.disconnect();
    }

    return sshResponse;

}
 

/**
 * Execute an ssh command on the server, without closing the session
 * so that a Reader can be returned with streaming data from the server.
 *
 * @param command the command to execute.
 * @return a Reader with streaming data from the server.
 * @throws IOException  if it is so.
 * @throws SshException if there are any ssh problems.
 */
@Override
public synchronized Reader executeCommandReader(String command) throws SshException, IOException {
    if (!isConnected()) {
        throw new IllegalStateException("Not connected!");
    }
    try {
        Channel channel = connectSession.openChannel("exec");
        ((ChannelExec)channel).setCommand(command);
        InputStreamReader reader = new InputStreamReader(channel.getInputStream(), "utf-8");
        channel.connect();
        return reader;
    } catch (JSchException ex) {
        throw new SshException(ex);
    }
}
 

private String readChannelInputStream(ChannelExec channel) throws IOException
{
    try (InputStream in = channel.getInputStream();
            InputStreamReader reader = new InputStreamReader(in, StandardCharsets.UTF_8);
            StringWriter stringWriter = new StringWriter())
    {
        while (true)
        {
            IOUtils.copy(reader, stringWriter);
            if (channel.isClosed())
            {
                if (in.available() > 0)
                {
                    continue;
                }
                return stringWriter.toString();
            }
            Sleeper.sleep(Duration.ofSeconds(1));
        }
    }
}
 

/**
 * This version takes a command to run, and then returns a wrapper instance
 * that exposes all the standard state of the channel (stdin, stdout,
 * stderr, exit status, etc). Channel connection is established if establishConnection
 * is true.
 *
 * @param command the command to execute.
 * @param establishConnection true if establish channel connetction within this method.
 * @return a Channel with access to all streams and the exit code.
 * @throws IOException  if it is so.
 * @throws SshException if there are any ssh problems.
 * @see #executeCommandReader(String)
 */
@Override
public synchronized ChannelExec executeCommandChannel(String command, Boolean establishConnection)
        throws SshException, IOException {
    if (!isConnected()) {
        throw new IOException("Not connected!");
    }
    try {
        ChannelExec channel = (ChannelExec)connectSession.openChannel("exec");
        channel.setCommand(command);
        if (establishConnection) {
            channel.connect();
        }
        return channel;
    } catch (JSchException ex) {
        throw new SshException(ex);
    }
}
 

public ScpConnection( SessionFactory sessionFactory, String path, ScpMode scpMode, CopyMode copyMode ) throws JSchException, IOException {
    this.session = sessionFactory.newSession();

    logger.debug( "connecting session" );
    session.connect();

    String command = getCommand( path, scpMode, copyMode );
    channel = session.openChannel( "exec" );
    logger.debug( "setting exec command to '{}'", command );
    ((ChannelExec) channel).setCommand( command );

    logger.debug( "connecting channel" );
    channel.connect();

    outputStream = channel.getOutputStream();
    inputStream = channel.getInputStream();

    if ( scpMode == ScpMode.FROM ) {
        writeAck();
    }
    else if ( scpMode == ScpMode.TO ) {
        checkAck();
    }

    this.entryStack = new Stack<CurrentEntry>();
}
 

/**
 * Tries to create a directory path on the target system
 *
 * @param path
 *            to create
 * @param session
 *            to use
 */
private void makePath(String path, Session session) throws IOException {
    ChannelExec channel = null;
    String trimmed = path;
    try {
        while (trimmed.length() > 0 && trimmed.charAt(trimmed.length() - 1) == fileSeparator) {
            trimmed = trimmed.substring(0, trimmed.length() - 1);
        }
        if (trimmed.length() == 0 || checkExistence(trimmed, session)) {
            return;
        }
        int nextSlash = trimmed.lastIndexOf(fileSeparator);
        if (nextSlash > 0) {
            String parent = trimmed.substring(0, nextSlash);
            makePath(parent, session);
        }
        channel = getExecChannel(session);
        String mkdir = replaceArgument(createDirCommand, trimmed);
        Message.debug("SShRepository: trying to create path: " + mkdir);
        channel.setCommand(mkdir);
        StringBuilder stdOut = new StringBuilder();
        StringBuilder stdErr = new StringBuilder();
        readSessionOutput(channel, stdOut, stdErr);
    } finally {
        if (channel != null) {
            channel.disconnect();
        }
    }
}
 

private void declareLostAndThrow(String errMsg, List<String> nodesUrl, ChannelExec chan, ByteArrayOutputStream baos,
        Exception e) throws RMException {
    String lf = System.lineSeparator();
    StringBuilder sb = new StringBuilder(errMsg);
    sb.append(lf).append(" > Process exit code: ").append(chan.getExitStatus());
    sb.append(lf).append(" > Process output: ").append(lf).append(new String(baos.toByteArray()));
    this.multipleDeclareDeployingNodeLost(nodesUrl, sb.toString());
    throw new RMException(errMsg, e);
}
 

/**
 * check for existence of file or dir on target system
 *
 * @param filePath
 *            to the object to check
 * @param session
 *            to use
 * @return true: object exists, false otherwise
 */
private boolean checkExistence(String filePath, Session session) throws IOException {
    Message.debug("SShRepository: checkExistence called: " + filePath);
    ChannelExec channel = null;
    channel = getExecChannel(session);
    String fullCmd = replaceArgument(existCommand, filePath);
    channel.setCommand(fullCmd);
    StringBuilder stdOut = new StringBuilder();
    StringBuilder stdErr = new StringBuilder();
    readSessionOutput(channel, stdOut, stdErr);
    return channel.getExitStatus() == 0;
}
 

@Override
public FileStatus getFileStatus(Path path) throws IOException {
  ChannelSftp channelSftp = null;
  ChannelExec channelExec1 = null;
  ChannelExec channelExec2 = null;
  try {
    channelSftp = this.fsHelper.getSftpChannel();
    SftpATTRS sftpAttrs = channelSftp.stat(HadoopUtils.toUriPath(path));
    FsPermission permission = new FsPermission((short) sftpAttrs.getPermissions());

    channelExec1 = this.fsHelper.getExecChannel("id " + sftpAttrs.getUId());
    String userName = IOUtils.toString(channelExec1.getInputStream());

    channelExec2 = this.fsHelper.getExecChannel("id " + sftpAttrs.getGId());
    String groupName = IOUtils.toString(channelExec2.getInputStream());

    FileStatus fs =
        new FileStatus(sftpAttrs.getSize(), sftpAttrs.isDir(), 1, 0l, sftpAttrs.getMTime(), sftpAttrs.getATime(),
            permission, StringUtils.trimToEmpty(userName), StringUtils.trimToEmpty(groupName), path);

    return fs;
  } catch (SftpException e) {
    throw new IOException(e);
  } finally {
    safeDisconnect(channelSftp);
    safeDisconnect(channelExec1);
    safeDisconnect(channelExec2);
  }

}
 

/**
 * Launch a command on the remote host and exit once the command is done.
 * 
 * @param session the session to use.
 * @param command the command to launch.
 * @return the output of the command.
 * @throws JSchException
 * @throws IOException
 */
private static String launchACommand( Session session, String command ) throws JSchException, IOException {
    Channel channel = session.openChannel("exec");
    ((ChannelExec) channel).setCommand(command);
    channel.setInputStream(null);
    ((ChannelExec) channel).setErrStream(System.err);
    InputStream in = channel.getInputStream();
    channel.connect();
    StringBuilder sb = new StringBuilder();
    byte[] tmp = new byte[1024];
    while( true ) {
        while( in.available() > 0 ) {
            int i = in.read(tmp, 0, 1024);
            if (i < 0)
                break;
            sb.append(new String(tmp, 0, i));
        }
        if (channel.isClosed()) {
            if (in.available() > 0)
                continue;
            System.out.println("exitstatus: " + channel.getExitStatus());
            break;
        }
        try {
            Thread.sleep(1000);
        } catch (Exception ee) {
        }
    }
    channel.disconnect();
    String remoteResponseStr = sb.toString().trim();
    return remoteResponseStr;
}
 

/**
 * Upload a file to the remote host via scp.
 * 
 * @param session the session to use.
 * @param localFile the local file path.
 * @param remoteFile the remote file path to copy into. 
 * @throws Exception
 */
public static void uploadFile( Session session, String localFile, String remoteFile ) throws Exception {
    boolean ptimestamp = true;
    // exec 'scp -t rfile' remotely
    String command = "scp " + (ptimestamp ? "-p" : "") + " -t " + remoteFile;
    Channel channel = session.openChannel("exec");
    ((ChannelExec) channel).setCommand(command);

    // get I/O streams for remote scp
    OutputStream out = channel.getOutputStream();
    InputStream in = channel.getInputStream();

    channel.connect();

    if (checkAck(in) != 0) {
        throw new RuntimeException();
    }

    File _lfile = new File(localFile);

    if (ptimestamp) {
        command = "T" + (_lfile.lastModified() / 1000) + " 0";
        // The access time should be sent here,
        // but it is not accessible with JavaAPI ;-<
        command += (" " + (_lfile.lastModified() / 1000) + " 0\n");
        out.write(command.getBytes());
        out.flush();
        if (checkAck(in) != 0) {
            throw new RuntimeException();
        }
    }

    // send "C0644 filesize filename", where filename should not include '/'
    long filesize = _lfile.length();
    command = "C0644 " + filesize + " ";
    if (localFile.lastIndexOf('/') > 0) {
        command += localFile.substring(localFile.lastIndexOf('/') + 1);
    } else {
        command += localFile;
    }
    command += "\n";
    out.write(command.getBytes());
    out.flush();
    if (checkAck(in) != 0) {
        throw new RuntimeException();
    }

    // send a content of lfile
    FileInputStream fis = new FileInputStream(localFile);
    byte[] buf = new byte[1024];
    while( true ) {
        int len = fis.read(buf, 0, buf.length);
        if (len <= 0)
            break;
        out.write(buf, 0, len); // out.flush();
    }
    fis.close();
    fis = null;
    // send '\0'
    buf[0] = 0;
    out.write(buf, 0, 1);
    out.flush();
    if (checkAck(in) != 0) {
        throw new RuntimeException();
    }
    out.close();

    channel.disconnect();
}
 

/**
 * Launch a command on the remote host and exit even if the command is not done (useful for launching daemons).
 * 
 * @param session the session to use.
 * @param command the command to launch.
 * @return the output of the command.
 * @throws JSchException
 * @throws IOException
 */
private static String launchACommandAndExit( Session session, String command ) throws JSchException, IOException {
    Channel channel = session.openChannel("exec");
    ((ChannelExec) channel).setCommand(command);
    channel.setInputStream(null);
    ((ChannelExec) channel).setErrStream(System.err);
    InputStream in = channel.getInputStream();
    channel.connect();
    StringBuilder sb = new StringBuilder();
    byte[] tmp = new byte[1024];
    while( true ) {
        while( in.available() > 0 ) {
            int i = in.read(tmp, 0, 1024);
            if (i < 0)
                break;
            sb.append(new String(tmp, 0, i));
        }
        if (channel.isClosed()) {
            if (in.available() > 0)
                continue;
            break;
        }
        try {
            if (sb.length() > 0) {
                break;
            }
            Thread.sleep(1000);
        } catch (Exception ee) {
        }
    }
    channel.disconnect();
    String remoteResponseStr = sb.toString().trim();
    return remoteResponseStr;
}