(Lianja) 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.

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// 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.
loMailman = createobject("CkMailMan")

// 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 = "www.my-ssh-server.com"
lnSshPort = 22

// Connect to an SSH server and establish the SSH tunnel:
llSuccess = loMailman.SshOpenTunnel(lcSshHostname,lnSshPort)
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loMailman
    return
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.
llSuccess = loMailman.SshAuthenticatePw("ssh_login","ssh_password")
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loMailman
    return
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 = .T.

// Connect to the POP3 server through the already-established SSH tunnel:
llSuccess = loMailman.Pop3BeginSession()
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loMailman
    return
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
    return
endif

// Download a max of 5 messages

for i = 1 to lnNumToDownload
    loEmail = loMailman.FetchByMsgnum(i)
    if (loMailman.LastMethodSuccess = .F.) then
        ? loMailman.LastErrorText
        release loMailman
        return
    endif

    ? loEmail.From
    ? loEmail.Subject
    ? "----"
    release loEmail
next

// Close the connection with the POP3 server, leaving the SSH tunnel open for subsequent POP3 connections.
llSuccess = loMailman.Pop3EndSession()
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loMailman
    return
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 = .F.

llSuccess = loMailman.Pop3BeginSession()
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loMailman
    return
endif

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

llSuccess = loMailman.Pop3EndSession()
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loMailman
    return
endif

// Close the SSH tunnel.
llSuccess = loMailman.SshCloseTunnel()
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loMailman
    return
endif



release loMailman