(Lianja) 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

Chilkat Lianja Extension Download Chilkat Lianja Extension

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

loSsh1 = createobject("CkSsh")

// Connect directly to the 1st SSH server.
llSuccess = loSsh1.Connect("serverssh1.com",22)
if (llSuccess <> .T.) then
    ? loSsh1.LastErrorText
    release loSsh1
    return
endif

// Authenticate using login/password:
llSuccess = loSsh1.AuthenticatePw("ssh1Login","ssh1Password")
if (llSuccess <> .T.) then
    ? loSsh1.LastErrorText
    release loSsh1
    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.
loSsh2 = createobject("CkSsh")
llSuccess = loSsh2.ConnectThroughSsh(loSsh1,"serverssh2.com",22)
if (llSuccess <> .T.) then
    ? loSsh2.LastErrorText
    release loSsh1
    release loSsh2
    return
endif

// Authenticate with ssh2...
llSuccess = loSsh2.AuthenticatePw("ssh2Login","ssh2Password")
if (llSuccess <> .T.) then
    ? loSsh2.LastErrorText
    release loSsh1
    release loSsh2
    return
endif

loMailman = createobject("CkMailMan")

// 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
llSuccess = loMailman.UseSsh(loSsh2)
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loSsh1
    release loSsh2
    release loMailman
    return
endif

// Set the POP3 server's hostname
loMailman.MailHost = "pop.someMailServer.com"

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

// Establish the POP3 connection through the ssh2 tunnel.
llSuccess = loMailman.Pop3BeginSession()
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loSsh1
    release loSsh2
    release loMailman
    return
endif

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

i = 1

do while i <= lnNumMessages

    loEmail = loMailman.FetchByMsgnum(i)
    if (loMailman.LastMethodSuccess <> .T.) then
        ? loMailman.LastErrorText
        release loSsh1
        release loSsh2
        release loMailman
        return
    endif

    ? loEmail.From + ": " + loEmail.Subject + Chr(10)
    release loEmail

    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.
llSuccess = 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