Use an Existing Socket SSH Tunnel

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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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bool 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.
Chilkat.Socket sshTunnel = new Chilkat.Socket();
success = sshTunnel.SshOpenTunnel("ssh.example.com",22);
if (success == false) {
    Debug.WriteLine(sshTunnel.LastErrorText);
    return;
}

success = sshTunnel.SshAuthenticatePw("sshUser","sshPassword");
if (success == false) {
    Debug.WriteLine(sshTunnel.LastErrorText);
    return;
}

Chilkat.MailMan mailman = new Chilkat.MailMan();

//  Configure the SMTP server connection.  These connections will travel through the tunnel.
mailman.SmtpHost = "smtp.example.com";
mailman.SmtpPort = 465;
mailman.SmtpSsl = true;
mailman.SmtpUsername = "user@example.com";
mailman.SmtpPassword = "myPassword";

//  Tell MailMan to route its connections through the existing tunnel.
success = mailman.UseSshTunnel(sshTunnel);
if (success == false) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

//  SMTP operations now travel through the shared SSH tunnel.
success = mailman.VerifySmtpLogin();
if (success == false) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

Debug.WriteLine("Authenticated with the SMTP server through the SSH tunnel.");