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(Java) POP3 over Multiple Hop SSH

Demonstrates how to read POP3 email (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2 => POP3Server

The ConnectThroughSsh and UseSsh methods are added in Chilkat version 9.5.0.55 to accomplish this task.

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Raspberry Pi and other single board computers

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    //  Important: It is helpful to send the contents of the
    //  ssh.LastErrorText property when requesting support.

    CkSsh ssh1 = new CkSsh();

    //  Any string automatically begins a fully-functional 30-day trial.
    boolean success = ssh1.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        System.out.println(ssh1.lastErrorText());
        return;
    }

    //  Connect directly to the 1st SSH server.
    success = ssh1.Connect("serverssh1.com",22);
    if (success != true) {
        System.out.println(ssh1.lastErrorText());
        return;
    }

    //  Authenticate using login/password:
    success = ssh1.AuthenticatePw("ssh1Login","ssh1Password");
    if (success != true) {
        System.out.println(ssh1.lastErrorText());
        return;
    }

    //  Connect through the 1st SSH connection to reach a 2nd SSH server.
    //  Note: Any number of SSH connections may be simultaneously tunneled through a single
    //  existing SSH connection.
    CkSsh ssh2 = new CkSsh();
    success = ssh2.ConnectThroughSsh(ssh1,"serverssh2.com",22);
    if (success != true) {
        System.out.println(ssh2.lastErrorText());
        return;
    }

    //  Authenticate with ssh2...
    success = ssh2.AuthenticatePw("ssh2Login","ssh2Password");
    if (success != true) {
        System.out.println(ssh2.lastErrorText());
        return;
    }

    CkMailMan mailman = new CkMailMan();

    //  Any string argument automatically begins the 30-day trial.
    success = mailman.UnlockComponent("30-day trial");
    if (success != true) {
        System.out.println(mailman.lastErrorText());
        return;
    }

    //  Tell the mailman object to connect to the POP3 server though the ssh2 tunnel (which itself is routed through ssh1).
    //  The connection looks like this:  Application => ServerSSH1 => ServerSSH2 => POP3Server
    success = mailman.UseSsh(ssh2);
    if (success != true) {
        System.out.println(mailman.lastErrorText());
        return;
    }

    //  Set the POP3 server's hostname
    mailman.put_MailHost("pop.someMailServer.com");

    //  Set the POP3 login/password.
    mailman.put_PopUsername("myLogin");
    mailman.put_PopPassword("myPassword");

    //  Establish the POP3 connection through the ssh2 tunnel.
    success = mailman.Pop3BeginSession();
    if (success != true) {
        System.out.println(mailman.lastErrorText());
        return;
    }

    //  Get the number of messages in the mailbox.
    int numMessages = mailman.GetMailboxCount();

    int i;
    if (numMessages > 0) {

        CkEmail email;
        for (i = 1; i <= numMessages; i++) {

            email = mailman.FetchByMsgnum(i);
            if (email == null ) {
                System.out.println(mailman.lastErrorText());
                return;
            }
            else {
                System.out.println(email.ck_from() + ": " + email.subject() + "\n");

            }

        }

    }

    //  Close the connection with the POP3 server.  (This closes the tunnel through ssh2)
    //  The connection with ssh2 is still alive, and may be used for more connections.
    success = mailman.Pop3EndSession();

    //  Close the connection with ssh2.  (This closes the the tunnel through ssh1.)
    //  The connection with ssh1 is still alive, and may be used for more connections.
    ssh2.Disconnect();

    ssh1.Disconnect();

  }
}

 

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