Lianja 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

Lianja

llSuccess = .F.

//  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 = .F.) then
    ? loSsh1.LastErrorText
    release loSsh1
    return
endif

//  Authenticate using login/password:
llSuccess = loSsh1.AuthenticatePw("ssh1Login","ssh1Password")
if (llSuccess = .F.) 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 = .F.) then
    ? loSsh2.LastErrorText
    release loSsh1
    release loSsh2
    return
endif

//  Authenticate with ssh2...
llSuccess = loSsh2.AuthenticatePw("ssh2Login","ssh2Password")
if (llSuccess = .F.) 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 = .F.) then
    ? loMailman.LastErrorText
    release loSsh1
    release loSsh2
    release loMailman
    return
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.
llSuccess = loMailman.Pop3BeginSession()
if (llSuccess = .F.) then
    ? loMailman.LastErrorText
    release loSsh1
    release loSsh2
    release loMailman
    return
endif

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

loEmail = createobject("CkEmail")
i = 1
do while i <= lnNumMessages
    //  Fetch by the message number (not by the UIDL)
    llSuccess = loMailman.FetchOne(.F.,0,i,loEmail)
    if (llSuccess = .F.) then
        ? loMailman.LastErrorText
        release loSsh1
        release loSsh2
        release loMailman
        release loEmail
        return
    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.
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
release loEmail