Start a Remote Shell with QuickShell

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Demonstrates the Chilkat Ssh.QuickShell method, which starts a remote shell using the simplified sequence OpenSessionChannel → SendReqPty → SendReqShell. It takes no arguments and returns the shell channel number, or -1 on failure. The default PTY size is 80 columns by 24 rows.

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    //  Demonstrates the Ssh.QuickShell method, which starts a remote shell using the simplified
    //  sequence OpenSessionChannel, SendReqPty, and SendReqShell.  It takes no arguments and returns
    //  the shell channel number, or -1 on failure.  The default PTY size is 80 columns by 24 rows.

    CkSsh ssh = new CkSsh();

    int sshPort = 22;
    success = ssh.Connect("ssh.example.com",sshPort);
    if (success == false) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    //  Normally you would not hard-code the password in source.  You should instead obtain it
    //  from an interactive prompt, environment variable, or a secrets vault.
    String password = "mySshPassword";

    success = ssh.AuthenticatePw("mySshLogin",password);
    if (success == false) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    //  Start the shell.  Note that QuickShell allocates a PTY, so the remote shell runs
    //  interactively: it prints a command prompt and echoes the commands that are sent to it.
    int channelNum = ssh.QuickShell();
    if (channelNum < 0) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    //  QuickShell returns as soon as the shell request is accepted -- it does not wait for or
    //  consume the initial login text or prompt.
    success = ssh.ChannelSendString(channelNum,"uname -a; echo DONE_MARKER\n","utf-8");
    if (success == false) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    //  IMPORTANT: Set a read timeout before receiving until a match.  ReadTimeoutMs defaults to 0,
    //  which means no limit -- without it, this call waits forever if the received data never
    //  contains a match.
    ssh.put_ReadTimeoutMs(15000);

    boolean caseSensitive = false;
    success = ssh.ChannelReceiveUntilMatch(channelNum,"DONE_MARKER","utf-8",caseSensitive);
    if (success == false) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    String output = ssh.getReceivedText(channelNum,"utf-8");
    if (ssh.get_LastMethodSuccess() == false) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    Log.i(TAG, output);

    ssh.Disconnect();

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}