Java

Use an Existing Socket SSH Tunnel

Demonstrates the Chilkat MailMan.UseSshTunnel method, which configures MailMan to use an existing SSH tunnel provided by a Socket object for its SMTP and POP3 connections. This example opens and authenticates a tunnel on a Socket, hands it to MailMan, and then verifies an SMTP login through it.

Background: Sharing one already-established SSH tunnel across objects avoids opening (and authenticating) a separate SSH connection for every component that needs to reach the remote network. Here the tunnel lives on a Socket object, which MailMan then routes its SMTP/POP3 traffic through. It is the Socket-based sibling of UseSsh, which shares an Ssh object instead.

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import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.MailMan;
import com.chilkatsoft.chilkat2.Socket;

public class ChilkatExample {

    public static void main(String[] args) {
        boolean success = false;

        // Demonstrates the MailMan.UseSshTunnel method, which configures MailMan to use an existing
        // SSH tunnel provided by a Socket object for its SMTP and POP3 connections.

        // Open and authenticate the SSH tunnel using a Socket object.
        Socket sshTunnel = new Socket();
        try {
            sshTunnel.sshOpenTunnel("ssh.example.com", 22);

            sshTunnel.sshAuthenticatePw("sshUser", "sshPassword");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        MailMan mailman = new MailMan();

        // Configure the SMTP server connection.  These connections will travel through the tunnel.
        mailman.setSmtpHost("smtp.example.com");
        mailman.setSmtpPort(465);
        mailman.setSmtpSsl(true);
        mailman.setSmtpUsername("user@example.com");
        mailman.setSmtpPassword("myPassword");

        // Tell MailMan to route its connections through the existing tunnel.
        try {
            mailman.useSshTunnel(sshTunnel);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // SMTP operations now travel through the shared SSH tunnel.
        success = mailman.verifySmtpLogin();
        if (!success) {
            System.out.println(mailman.getLastErrorText());
            return;
        }

        System.out.println("Authenticated with the SMTP server through the SSH tunnel.");
    }
}