(Visual FoxPro) 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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loMailman
LOCAL lcSshHostname
LOCAL lnSshPort
LOCAL lnSuccess
LOCAL lnNumToDownload
LOCAL i
LOCAL loEmail

* 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.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.MailMan')
loMailman = 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).
lcSshHostname = "sftp.example.com"
lnSshPort = 22

* Connect to an SSH server and establish the SSH tunnel:
lnSuccess = loMailman.SshOpenTunnel(lcSshHostname,lnSshPort)
IF (lnSuccess <> 1) THEN
    ? loMailman.LastErrorText
    RELEASE loMailman
    CANCEL
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.
lnSuccess = loMailman.SshAuthenticatePw("ssh_login","ssh_password")
IF (lnSuccess <> 1) THEN
    ? loMailman.LastErrorText
    RELEASE loMailman
    CANCEL
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
loMailman.MailHost = "mail.my-pop3-server.com"

* Set the POP3 settings for your POP3 server:
loMailman.PopUsername = "pop3_login"
loMailman.PopPassword = "pop3_password"
loMailman.MailPort = 995
loMailman.PopSsl = 1

* Connect to the POP3 server through the already-established SSH tunnel:
lnSuccess = loMailman.Pop3BeginSession()
IF (lnSuccess <> 1) THEN
    ? loMailman.LastErrorText
    RELEASE loMailman
    CANCEL
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.
? loMailman.LastErrorText

* How many messages are in the POP3 inbox?
lnNumToDownload = loMailman.GetMailboxCount()
IF (lnNumToDownload > 5) THEN
    lnNumToDownload = 5
ENDIF

IF (lnNumToDownload = 0) THEN
    RELEASE loMailman
    CANCEL
ENDIF

* Download a max of 5 messages

FOR i = 1 TO lnNumToDownload
    loEmail = loMailman.FetchByMsgnum(i)
    IF (loMailman.LastMethodSuccess = 0) THEN
        ? loMailman.LastErrorText
        RELEASE loMailman
        CANCEL
    ENDIF

    ? loEmail.From
    ? loEmail.Subject
    ? "----"
    RELEASE loEmail
NEXT

* Close the connection with the POP3 server, leaving the SSH tunnel open for subsequent POP3 connections.
lnSuccess = loMailman.Pop3EndSession()
IF (lnSuccess <> 1) THEN
    ? loMailman.LastErrorText
    RELEASE loMailman
    CANCEL
ENDIF

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

* Set the POP3 settings for your POP3 server:
loMailman.PopUsername = "pop3_login2"
loMailman.PopPassword = "pop3_password2"
loMailman.MailPort = 110
loMailman.PopSsl = 0

lnSuccess = loMailman.Pop3BeginSession()
IF (lnSuccess <> 1) THEN
    ? loMailman.LastErrorText
    RELEASE loMailman
    CANCEL
ENDIF

* Review the LastErrorText to see that the connection was made via the SSH tunnel:
? loMailman.LastErrorText

lnSuccess = loMailman.Pop3EndSession()
IF (lnSuccess <> 1) THEN
    ? loMailman.LastErrorText
    RELEASE loMailman
    CANCEL
ENDIF

* Close the SSH tunnel.
lnSuccess = loMailman.SshCloseTunnel()
IF (lnSuccess <> 1) THEN
    ? loMailman.LastErrorText
    RELEASE loMailman
    CANCEL
ENDIF

RELEASE loMailman