(Android™) Using sudo in an SSH Shell Session

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Demonstrates how to run a command as sudo in a shell session.

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// 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);

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSsh ssh = new CkSsh();

    int port = 22;
    boolean success = ssh.Connect("the-ssh-server.com",port);
    if (success != true) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    // Authenticate using login/password:
    success = ssh.AuthenticatePw("theSshLogin","theSshPassword");
    if (success != true) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    // Start a shell session.
    // (The QuickShell method was added in Chilkat v9.5.0.65)
    int channelNum = ssh.QuickShell();
    if (channelNum < 0) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    // Construct a StringBuilder with our command ("ls") run with "sudo"
    // Note: The line-endings are potentially important.  Some SSH servers may
    // require either LF or CRLF line endings.  (Unix/Linux/OSX servers typically
    // use bare-LF line endings.  Windows servers likely use CRLF line endings.)

    // Using "sudo -S" causes the sudo prompt to be written to stderr,
    // and the password is read from stdin (i.e. from the echo command ouput).
    // The sudo commands -p option allows us to set the prompt, and we can set it to
    // the empty string, thus eliminating the prompt from the stderr completely.
    // This allows us to run the command as root (super-user) with no prompt.
    CkStringBuilder sbCommands = new CkStringBuilder();
    sbCommands.Append("echo \"theSshPassword\" | sudo -S -p \"\" ls\n");

    // Add another command to echo a marker string that
    // we'll use in ChannelReceiveUntilMatch below.
    // The use of single quotes around 'IS' is a trick so that the output
    // of the command is "THIS IS THE END OF THE SCRIPT", but the terminal echo
    // includes the single quotes.  This allows us to read until we see the actual
    // output of the last command.
    sbCommands.Append("echo THIS 'IS' THE END OF THE SCRIPT\n");

    // Send the commands..
    success = ssh.ChannelSendString(channelNum,sbCommands.getAsString(),"ansi");
    if (success != true) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    // Send an EOF to indicate no more commands will be sent.
    // For brevity, we're not checking the return values of each method call.
    // Your code should check the success/failure of each call.
    success = ssh.ChannelSendEof(channelNum);

    // Receive output up to our marker.
    success = ssh.ChannelReceiveUntilMatch(channelNum,"THIS IS THE END OF THE SCRIPT","ansi",true);

    // Close the channel.
    // It is important to close the channel only after receiving the desired output.
    success = ssh.ChannelSendClose(channelNum);

    // Get any remaining output..
    success = ssh.ChannelReceiveToClose(channelNum);

    // Get the complete output for all the commands in the session.
    Log.i(TAG, "--- output ----");
    Log.i(TAG, ssh.getReceivedText(channelNum,"ansi"));

  }

  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."
  }
}