Xbase++ Requires Chilkat v11.0.0+

POP3 SSH Tunneling (Port Forwarding)

Demonstrates how to connect to a POP3 server through an SSH tunnel. Reads a POP3 mailbox and display the FROM and SUBJECT header fields of each email. Xbase++

LOCAL nSuccess
LOCAL oMailman
LOCAL cSshHostname
LOCAL nSshPort
LOCAL nNumToDownload
LOCAL i
LOCAL oEmail

nSuccess := 0

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

//  The mailman object is used for receiving (POP3) 
//  and sending (SMTP) email.
oMailman := CreateObject("Chilkat.MailMan")

//  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).
cSshHostname := "sftp.example.com"
nSshPort := 22

//  Connect to an SSH server and establish the SSH tunnel:
nSuccess := oMailman:SshOpenTunnel(cSshHostname, nSshPort)
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    RETURN
ENDIF

//  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 POP3 server, it is
//  for authenticating with the SSH server, which is separate.
nSuccess := oMailman:SshAuthenticatePw("ssh_login", "ssh_password")
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    RETURN
ENDIF

//  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.

//  The SSH tunnel may be kept open for any number of 
//  POP3 connections.  

//  Set the POP3 server's hostname
oMailman:MailHost := "mail.my-pop3-server.com"

//  Set the POP3 settings for your POP3 server:
oMailman:PopUsername := "pop3_login"
oMailman:PopPassword := "pop3_password"
oMailman:MailPort := 995
oMailman:PopSsl := 1

//  Connect to the POP3 server through the already-established SSH tunnel:
nSuccess := oMailman:Pop3BeginSession()
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    RETURN
ENDIF

//  A visual inspection of the LastErrorText after
//  a successful POP3 connection will confirm the SSH tunneling.
//  Note: If the POP3 connection uses SSL/TLS, then the SSL/TLS 
//  secure channel will be wrapped within the SSH tunnel.
? oMailman:LastErrorText

//  How many messages are in the POP3 inbox?
nNumToDownload := oMailman:GetMailboxCount()
IF (nNumToDownload > 5)
    nNumToDownload := 5
ENDIF

IF (nNumToDownload == 0)
    ? "No messages in the POP3 inbox."
    oMailman:destroy()
    RETURN
ENDIF

//  Download a max of 5 messages

oEmail := CreateObject("Chilkat.Email")
FOR i := 1 TO nNumToDownload
    nSuccess := oMailman:FetchOne(0, 0, i, oEmail)
    IF (nSuccess == 0)
        ? oMailman:LastErrorText
        oMailman:destroy()
        oEmail:destroy()
        RETURN
    ENDIF

    ? oEmail:From
    ? oEmail:Subject
    ? "----"
NEXT

//  Close the connection with the POP3 server, leaving the SSH tunnel open for subsequent POP3 connections.
nSuccess := oMailman:Pop3EndSession()
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    oEmail:destroy()
    RETURN
ENDIF

//  Try connecting to a different POP3 server through the same aleady setup SSH tunnel:
//  Set the POP3 server's hostname
oMailman:MailHost := "mail.my-pop3-server2.com"

//  Set the POP3 settings for your POP3 server:
oMailman:PopUsername := "pop3_login2"
oMailman:PopPassword := "pop3_password2"
oMailman:MailPort := 110
oMailman:PopSsl := 0

nSuccess := oMailman:Pop3BeginSession()
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    oEmail:destroy()
    RETURN
ENDIF

//  Review the LastErrorText to see that the connection was made via the SSH tunnel:
? oMailman:LastErrorText

nSuccess := oMailman:Pop3EndSession()
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    oEmail:destroy()
    RETURN
ENDIF

//  Close the SSH tunnel.
nSuccess := oMailman:SshCloseTunnel()
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    oEmail:destroy()
    RETURN
ENDIF

oMailman:destroy()
oEmail:destroy()