(PowerBuilder) SMTP SSH Tunneling (Port Forwarding)

Demonstrates how to setup an SSH tunnel for SMTP. This example connects to an SMTP sever via an SSH tunnel and sends an email.

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integer li_rc
oleobject loo_Mailman
integer li_Success
string ls_SshHostname
integer li_SshPort
oleobject loo_Email

//  The mailman object is used for sending (SMTP) and receiving (POP3) email.
loo_Mailman = create oleobject
li_rc = loo_Mailman.ConnectToNewObject("Chilkat_9_5_0.MailMan")
if li_rc < 0 then
    destroy loo_Mailman
    MessageBox("Error","Connecting to COM object failed")
    return
end if

//  Any string argument automatically begins the 30-day trial.
li_Success = loo_Mailman.UnlockComponent("30-day trial.")
if li_Success <> 1 then
    Write-Debug loo_Mailman.LastErrorText
    destroy loo_Mailman
    return
end if

//  Connect to an SSH server and establish the SSH tunnel:

//  The SSH hostname may be a hostname or an
//  IP address, such as "192.168.1.108".
//  The port is typically 22 (the standard port for SSH).
ls_SshHostname = "www.my-ssh-server.com"
li_SshPort = 22

li_Success = loo_Mailman.SshOpenTunnel(ls_SshHostname,li_SshPort)
if li_Success <> 1 then
    Write-Debug loo_Mailman.LastErrorText
    destroy loo_Mailman
    return
end if

//  Authenticate with the SSH server via a login/password
//  or with a public key.
//  This example demonstrates SSH password authentication.
//  Note: This is not authenticating with the SMTP server, it is
//  for authenticating with the SSH server, which is separate.
li_Success = loo_Mailman.SshAuthenticatePw("sshLogin","sshPassword")
if li_Success <> 1 then
    Write-Debug loo_Mailman.LastErrorText
    destroy loo_Mailman
    return
end if

//  OK, the SSH tunnel is setup.  The mailman may
//  be used exactly the same as usual, except all communications
//  are now sent through the SSH tunnel.

//  Set the SMTP server.
loo_Mailman.SmtpHost = "smtp.my-smtp-server.com"

//  Set the SMTP login/password (if required)
loo_Mailman.SmtpUsername = "smtpLogin"
loo_Mailman.SmtpPassword = "smtpPassword"

//  Create a new email object
loo_Email = create oleobject
li_rc = loo_Email.ConnectToNewObject("Chilkat_9_5_0.Email")

loo_Email.Subject = "This is a test"
loo_Email.Body = "This is a test"
loo_Email.From = "Chilkat Support <support@chilkatsoft.com>"
li_Success = loo_Email.AddTo("Chilkat Admin","admin@chilkatsoft.com")

//  The call to SendEmail automatically connects to the SMTP
//  server via the SSH tunnel (if not already connected).
//  Because the SSH tunnel has been previously setup,
//  this does not establish a direct connection with the SMTP
//  server.  It directs the SSH server to establish the connection.

//  After SendEmail completes, the connection (i.e. session) remains
//  open so that subsequent SendEmail calls may use the
//  same SSH tunnel.
li_Success = loo_Mailman.SendEmail(loo_Email)
if li_Success <> 1 then
    Write-Debug loo_Mailman.LastErrorText
    destroy loo_Mailman
    destroy loo_Email
    return
end if

//  If you're curious, have a look at LastErrorText after
//  a successful send.  You'll see detailed information that
//  confirms the SSH tunneling.
Write-Debug loo_Mailman.LastErrorText

//  Note: Some SMTP servers do not actually send the email until
//  the connection is closed.  In these cases, it is necessary to
//  call CloseSmtpConnection for the mail to be  sent.
//  Most SMTP servers send the email immediately, and it is
//  not required to close the connection.

Write-Debug "Mail Sent!"


destroy loo_Mailman
destroy loo_Email