Xbase++ Requires Chilkat v11.0.0+

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

Xbase++

LOCAL nSuccess
LOCAL oSsh1
LOCAL oSsh2
LOCAL oMailman
LOCAL nNumMessages
LOCAL oEmail
LOCAL i

nSuccess := 0

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

oSsh1 := CreateObject("Chilkat.Ssh")

//  Connect directly to the 1st SSH server.
nSuccess := oSsh1:Connect("serverssh1.com", 22)
IF (nSuccess == 0)
    ? oSsh1:LastErrorText
    oSsh1:destroy()
    RETURN
ENDIF

//  Authenticate using login/password:
nSuccess := oSsh1:AuthenticatePw("ssh1Login", "ssh1Password")
IF (nSuccess == 0)
    ? oSsh1:LastErrorText
    oSsh1:destroy()
    RETURN
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.
oSsh2 := CreateObject("Chilkat.Ssh")
nSuccess := oSsh2:ConnectThroughSsh(oSsh1, "serverssh2.com", 22)
IF (nSuccess == 0)
    ? oSsh2:LastErrorText
    oSsh1:destroy()
    oSsh2:destroy()
    RETURN
ENDIF

//  Authenticate with ssh2...
nSuccess := oSsh2:AuthenticatePw("ssh2Login", "ssh2Password")
IF (nSuccess == 0)
    ? oSsh2:LastErrorText
    oSsh1:destroy()
    oSsh2:destroy()
    RETURN
ENDIF

oMailman := 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
nSuccess := oMailman:UseSsh(oSsh2)
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oSsh1:destroy()
    oSsh2:destroy()
    oMailman:destroy()
    RETURN
ENDIF

//  Set the POP3 server's hostname
oMailman:MailHost := "pop.example.com"

//  Set the POP3 login/password.
oMailman:PopUsername := "myLogin"
oMailman:PopPassword := "myPassword"

//  Establish the POP3 connection through the ssh2 tunnel.
nSuccess := oMailman:Pop3BeginSession()
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oSsh1:destroy()
    oSsh2:destroy()
    oMailman:destroy()
    RETURN
ENDIF

//  Get the number of messages in the mailbox.
nNumMessages := oMailman:GetMailboxCount()

oEmail := CreateObject("Chilkat.Email")
i := 1
DO WHILE i <= nNumMessages
    //  Fetch by the message number (not by the UIDL)
    nSuccess := oMailman:FetchOne(0, 0, i, oEmail)
    IF (nSuccess == 0)
        ? oMailman:LastErrorText
        oSsh1:destroy()
        oSsh2:destroy()
        oMailman:destroy()
        oEmail:destroy()
        RETURN
    ENDIF

    ? oEmail:From + ": " + oEmail: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.
nSuccess := oMailman: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.

oSsh2:Disconnect()

oSsh1:Disconnect()

oSsh1:destroy()
oSsh2:destroy()
oMailman:destroy()
oEmail:destroy()