(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
string ls_SshHostname
integer li_SshPort
integer li_Success
oleobject loo_Email

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// The mailman object is used for sending (SMTP) and receiving (POP3) email.
loo_Mailman = create oleobject
// Use "Chilkat_9_5_0.MailMan" for versions of Chilkat < 10.0.0
li_rc = loo_Mailman.ConnectToNewObject("Chilkat.MailMan")
if li_rc < 0 then
    destroy loo_Mailman
    MessageBox("Error","Connecting to COM object failed")
    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 = "sftp.example.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
// Use "Chilkat_9_5_0.Email" for versions of Chilkat < 10.0.0
li_rc = loo_Email.ConnectToNewObject("Chilkat.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