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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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llSuccess = .F.

//  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.
loSshTunnel = createobject("CkSocket")
llSuccess = loSshTunnel.SshOpenTunnel("ssh.example.com",22)
if (llSuccess = .F.) then
    ? loSshTunnel.LastErrorText
    release loSshTunnel
    return
endif

llSuccess = loSshTunnel.SshAuthenticatePw("sshUser","sshPassword")
if (llSuccess = .F.) then
    ? loSshTunnel.LastErrorText
    release loSshTunnel
    return
endif

loMailman = createobject("CkMailMan")

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

//  Tell MailMan to route its connections through the existing tunnel.
llSuccess = loMailman.UseSshTunnel(loSshTunnel)
if (llSuccess = .F.) then
    ? loMailman.LastErrorText
    release loSshTunnel
    release loMailman
    return
endif

//  SMTP operations now travel through the shared SSH tunnel.
llSuccess = loMailman.VerifySmtpLogin()
if (llSuccess = .F.) then
    ? loMailman.LastErrorText
    release loSshTunnel
    release loMailman
    return
endif

? "Authenticated with the SMTP server through the SSH tunnel."


release loSshTunnel
release loMailman