Examples of ch.ethz.ssh2.Session

ch.ethz.ssh2.Session
A Session is a remote execution of a program. "Program" means in this context either a shell, an application or a system command. The program may or may not have a tty. Only one single program can be started on a session. However, multiple sessions can be active simultaneously. @author Christian Plattner, plattner@inf.ethz.ch @version $Id: Session.java,v 1.9 2006/02/14 19:43:16 cplattne Exp $

         * 
         * AUTHENTICATION OK. DO SOMETHING.
         * 
         */


        Session sess = conn.openSession();


        int x_width = 90;
        int y_width = 30;


        sess.requestPTY("dumb", x_width, y_width, 0, 0, null);
        sess.startShell();


        TerminalDialog td = new TerminalDialog(loginFrame, username + "@" + hostname, sess, x_width, y_width);


        /* The following call blocks until the dialog has been closed */

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      if (isAuthenticated == false)
        throw new IOException("Authentication failed.");


      /* Create a session */


      Session sess = conn.openSession();


      sess.execCommand("uname -a && date && uptime && who");


      System.out.println("Here is some information about the remote host:");


      /* 
       * This basic example does not handle stderr, which is sometimes dangerous
       * (please read the FAQ).
       */


      InputStream stdout = new StreamGobbler(sess.getStdout());


      BufferedReader br = new BufferedReader(new InputStreamReader(stdout));


      while (true)
      {
        String line = br.readLine();
        if (line == null)
          break;
        System.out.println(line);
      }


      /* Show exit status, if available (otherwise "null") */


      System.out.println("ExitCode: " + sess.getExitStatus());


      /* Close this session */


      sess.close();


      /* Close the connection */


      conn.close();

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      if (isAuthenticated == false)
        throw new IOException("Authentication failed.");


      /* Create a session */


      Session sess = conn.openSession();


      sess.execCommand("echo \"Text on STDOUT\"; echo \"Text on STDERR\" >&2");


      InputStream stdout = new StreamGobbler(sess.getStdout());
      InputStream stderr = new StreamGobbler(sess.getStderr());
  
      BufferedReader stdoutReader = new BufferedReader(new InputStreamReader(stdout));
      BufferedReader stderrReader = new BufferedReader(new InputStreamReader(stderr));
      
      System.out.println("Here is the output from stdout:");
  
      while (true)
      {
        String line = stdoutReader.readLine();
        if (line == null)
          break;
        System.out.println(line);
      }
      
      System.out.println("Here is the output from stderr:");
      
      while (true)
      {
        String line = stderrReader.readLine();
        if (line == null)
          break;
        System.out.println(line);
      }
      
      /* Close this session */
      
      sess.close();


      /* Close the connection */


      conn.close();

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      if (isAuthenticated == false)
        throw new IOException("Authentication failed.");


      /* Create a session */


      Session sess = conn.openSession();


      sess.execCommand("uname -a && date && uptime && who");


      InputStream stdout = new StreamGobbler(sess.getStdout());
      BufferedReader br = new BufferedReader(new InputStreamReader(stdout));


      System.out.println("Here is some information about the remote host:");


      while (true)
      {
        String line = br.readLine();
        if (line == null)
          break;
        System.out.println(line);
      }


      /* Close this session */


      sess.close();


      /* Close the connection */


      conn.close();

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      if (isAuthenticated == false)
        throw new IOException("Authentication failed.");


      /* Create a session */


      Session sess = conn.openSession();


      sess.execCommand("uname -a && date && uptime && who");


      InputStream stdout = new StreamGobbler(sess.getStdout());


      BufferedReader br = new BufferedReader(new InputStreamReader(stdout));


      System.out.println("Here is some information about the remote host:");


      while (true)
      {
        String line = br.readLine();
        if (line == null)
          break;
        System.out.println(line);
      }


      /* Close this session */
      
      sess.close();


      /* Close the connection */


      conn.close();

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   * \return boolean
   *
   * @return
   */
  public boolean remoteIsWindowsShell() {
    Session objSSHSession = null;
    flgIsRemoteOSWindows = false;


    try {
      // TODO the testcommand should be defined by an option
      String checkShellCommand = "echo %ComSpec%";
      logger.debug("Opening new session...");
      objSSHSession = this.getSshConnection().openSession();
      logger.debug("Executing command " + checkShellCommand);
      objSSHSession.execCommand(checkShellCommand);


      logger.debug("output to stdout for remote command: " + checkShellCommand);
      ipsStdOut = new StreamGobbler(objSSHSession.getStdout());
      ipsStdErr = new StreamGobbler(objSSHSession.getStderr());
      BufferedReader stdoutReader = new BufferedReader(new InputStreamReader(ipsStdOut));
      String stdOut = "";
      while (true) {
        String line = stdoutReader.readLine();
        if (line == null)
          break;
        logger.debug(line);
        stdOut += line;
      }
      logger.debug("output to stderr for remote command: " + checkShellCommand);
      BufferedReader stderrReader = new BufferedReader(new InputStreamReader(ipsStdErr));
      while (true) {
        String line = stderrReader.readLine();
        if (line == null)
          break;
        logger.debug(line);
      }
      // TODO The expected result-string for testing the os should be defined by an option
      if (stdOut.indexOf("cmd.exe") > -1) {
        logger.debug("Remote shell is a Windows shell.");
        flgIsRemoteOSWindows = true;
        return true;
      }
      else {
        logger.debug("Remote shell is a Linux/Unix shell.");
      }
    }
    catch (Exception e) {
      logger.debug("Failed to check if remote system is windows shell: " + e);
    }
    finally {
      if (objSSHSession != null)
        try {
          objSSHSession.close();
        }
        catch (Exception e) {
          logger.debug("Failed to close session: ", e);
        }
    }

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    }


    public void cancelTheSession() {
        cancelIt = true;
        mSessionLock.lock();
        final Session thisSession;
        try {
            thisSession = sess;
            sess = null;
        } finally {
            mSessionLock.unlock();
        }
        if (thisSession != null) {
            thisSession.close();
        }
    }

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    private void openSshSession(final ConnectionTimeout connectionTimeout)
            throws IOException {
        /* it may hang here if we lost connection, so it will be
         * interrupted after a timeout. */
        final Session newSession = connectionThread.getConnection().openSession();
        mSessionLock.lock();
        try {
            sess = newSession;
        } finally {
            mSessionLock.unlock();

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        int exitCode = DEFAULT_EXIT_CODE;
        String outputString = "";
        try {
            mSessionLock.lock();
            final Session thisSession;
            try {
                thisSession = sess;
            } finally {
                mSessionLock.unlock();
            }
            if (thisSession == null) {
                return new SshOutput("", 130);
            }
            /* requestPTY mixes stdout and strerr together, but it works
            better at the moment.
            With pty, the sudo wouldn't work, because we don't want
            to enter sudo password by every command.
            (It would be exposed) */
            thisSession.requestPTY("dumb", 0, 0, 0, 0, null);
            LOG.debug2("execOneCommand: command: "
                       + host.getName()
                       + ": "
                       + host.getSudoCommand(host.getHoppedCommand(oneCommand), true));
            thisSession.execCommand("bash -c '"
                                    + Tools.escapeSingleQuotes("export LC_ALL=C;"
                                                               + host.getSudoCommand(host.getHoppedCommand(oneCommand),
                                                                                     false), 1) + '\'');
            outputString = execCommandAndCaptureOutput(oneCommand, thisSession);
            if (cancelIt) {
                return new SshOutput("", 130);
            }
            if (commandVisible) {
                host.getTerminalPanel().nextCommand();
            }
            thisSession.waitForCondition(ChannelCondition.EXIT_STATUS, 10000);
            final Integer ec = thisSession.getExitStatus();
            if (ec != null) {
                exitCode = ec;
            }
            thisSession.close();
            sess = null;
        } catch (final IOException e) {
            LOG.appWarning("execOneCommand: " + host.getName() + ':' + e.getMessage() + ':' + oneCommand);
            exitCode = ERROR_EXIT_CODE;
            cancelTheSession();

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            boolean isAuthenticated = conn.authenticateWithPassword(this.user, this.password);
            if (isAuthenticated == false) {
                result.append("ERROR: Authentication Failed !");
            }


            Session session = conn.openSession();


            session.execCommand(cmd);
            BufferedReader read =
                    new BufferedReader(new InputStreamReader(new StreamGobbler(session.getStdout()), "GBK"));
            String line = "";
            while ((line = read.readLine()) != null) {
                result.append(line).append("\r\n");
            }
            session.close();
            conn.close();
            return result.toString();
        }
        catch (Throwable e) {
            throw new RemoteExecuteException("ִ���������", e);

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