Swift

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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Swift


func chilkatTest() {
    var success: Bool = 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.
    let sshTunnel = CkoSocket()!
    success = sshTunnel.sshOpenTunnel(sshHostname: "ssh.example.com", sshPort: 22)
    if success == false {
        print("\(sshTunnel.lastErrorText!)")
        return
    }

    success = sshTunnel.sshAuthenticatePw(sshLogin: "sshUser", sshPassword: "sshPassword")
    if success == false {
        print("\(sshTunnel.lastErrorText!)")
        return
    }

    let mailman = CkoMailMan()!

    //  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(tunnel: sshTunnel)
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    //  SMTP operations now travel through the shared SSH tunnel.
    success = mailman.verifySmtpLogin()
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    print("Authenticated with the SMTP server through the SSH tunnel.")

}