(Android™) FTP Connect, Examine Server Certificate, and then Authenticate

Demonstrates how to connect to an FTP server, examine the server's SSL/TLS certificate, and then, if it meets the application's security requirements, proceed to authenticate.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// 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 assumes Chilkat Ftp2 to have been previously unlocked.
    // See Unlock Ftp2 for sample code.

    CkFtp2 ftp = new CkFtp2();

    ftp.put_Hostname("www.authtls-ftps-server.com");
    ftp.put_Username("FTP_LOGIN");
    ftp.put_Password("FTP_PASSWORD");
    ftp.put_AuthTls(true);
    ftp.put_Port(21);

    // Connect to the FTP server using explicit TLS (AUTH TLS).
    boolean success = ftp.ConnectOnly();
    if (success != true) {
        Log.i(TAG, ftp.lastErrorText());
        return;
        }

    // Get the FTP server's certificate.
    CkCert serverCert = ftp.GetSslServerCert();
    if (ftp.get_LastMethodSuccess() != true) {
        Log.i(TAG, ftp.lastErrorText());
        return;
        }

    // Now that we have the certificate, we can check it in any way we desire.
    // (See the online reference documentation for the certificate object's methods
    // and properties)...

    // Assuming the certificate is OK, proceed to authenticate with the FTP server.
    success = ftp.LoginAfterConnectOnly();
    if (success != true) {
        Log.i(TAG, ftp.lastErrorText());
        return;
        }

    // 
    // Proceed with uploading/download files, etc...
    // 

    ftp.Disconnect();
    Log.i(TAG, "Success.");

  }

  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."
  }
}