Visual FoxPro

POP3 over Multiple Hop SSH

Demonstrates how to read POP3 email (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2 => POP3Server

Visual FoxPro

LOCAL lnSuccess
LOCAL loSsh1
LOCAL loSsh2
LOCAL loMailman
LOCAL lnNumMessages
LOCAL loEmail
LOCAL i

lnSuccess = 0

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

loSsh1 = CreateObject('Chilkat.Ssh')

* Connect directly to the 1st SSH server.
lnSuccess = loSsh1.Connect("serverssh1.com",22)
IF (lnSuccess = 0) THEN
    ? loSsh1.LastErrorText
    RELEASE loSsh1
    CANCEL
ENDIF

* Authenticate using login/password:
lnSuccess = loSsh1.AuthenticatePw("ssh1Login","ssh1Password")
IF (lnSuccess = 0) THEN
    ? loSsh1.LastErrorText
    RELEASE loSsh1
    CANCEL
ENDIF

* Connect through the 1st SSH connection to reach a 2nd SSH server.
* Note: Any number of SSH connections may be simultaneously tunneled through a single
* existing SSH connection.
loSsh2 = CreateObject('Chilkat.Ssh')
lnSuccess = loSsh2.ConnectThroughSsh(loSsh1,"serverssh2.com",22)
IF (lnSuccess = 0) THEN
    ? loSsh2.LastErrorText
    RELEASE loSsh1
    RELEASE loSsh2
    CANCEL
ENDIF

* Authenticate with ssh2...
lnSuccess = loSsh2.AuthenticatePw("ssh2Login","ssh2Password")
IF (lnSuccess = 0) THEN
    ? loSsh2.LastErrorText
    RELEASE loSsh1
    RELEASE loSsh2
    CANCEL
ENDIF

loMailman = CreateObject('Chilkat.MailMan')

* Tell the mailman object to connect to the POP3 server though the ssh2 tunnel (which itself is routed through ssh1).
* The connection looks like this:  Application => ServerSSH1 => ServerSSH2 => POP3Server
lnSuccess = loMailman.UseSsh(loSsh2)
IF (lnSuccess = 0) THEN
    ? loMailman.LastErrorText
    RELEASE loSsh1
    RELEASE loSsh2
    RELEASE loMailman
    CANCEL
ENDIF

* Set the POP3 server's hostname
loMailman.MailHost = "pop.example.com"

* Set the POP3 login/password.
loMailman.PopUsername = "myLogin"
loMailman.PopPassword = "myPassword"

* Establish the POP3 connection through the ssh2 tunnel.
lnSuccess = loMailman.Pop3BeginSession()
IF (lnSuccess = 0) THEN
    ? loMailman.LastErrorText
    RELEASE loSsh1
    RELEASE loSsh2
    RELEASE loMailman
    CANCEL
ENDIF

* Get the number of messages in the mailbox.
lnNumMessages = loMailman.GetMailboxCount()

loEmail = CreateObject('Chilkat.Email')
i = 1
DO WHILE i <= lnNumMessages
    * Fetch by the message number (not by the UIDL)
    lnSuccess = loMailman.FetchOne(0,0,i,loEmail)
    IF (lnSuccess = 0) THEN
        ? loMailman.LastErrorText
        RELEASE loSsh1
        RELEASE loSsh2
        RELEASE loMailman
        RELEASE loEmail
        CANCEL
    ENDIF

    ? loEmail.From + ": " + loEmail.Subject + CHR(10)

    i = i + 1
ENDDO

* Close the connection with the POP3 server.  (This closes the tunnel through ssh2)
* The connection with ssh2 is still alive, and may be used for more connections.
lnSuccess = loMailman.Pop3EndSession()

* Close the connection with ssh2.  (This closes the the tunnel through ssh1.)
* The connection with ssh1 is still alive, and may be used for more connections.

loSsh2.Disconnect()

loSsh1.Disconnect()

RELEASE loSsh1
RELEASE loSsh2
RELEASE loMailman
RELEASE loEmail