(Xojo Plugin) 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 Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

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

Dim ssh1 As New Chilkat.Ssh

// Connect directly to the 1st SSH server.
Dim success As Boolean
success = ssh1.Connect("serverssh1.com",22)
If (success <> True) Then
    System.DebugLog(ssh1.LastErrorText)
    Return
End If

// Authenticate using login/password:
success = ssh1.AuthenticatePw("ssh1Login","ssh1Password")
If (success <> True) Then
    System.DebugLog(ssh1.LastErrorText)
    Return
End If

// 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.
Dim ssh2 As New Chilkat.Ssh
success = ssh2.ConnectThroughSsh(ssh1,"serverssh2.com",22)
If (success <> True) Then
    System.DebugLog(ssh2.LastErrorText)
    Return
End If

// Authenticate with ssh2...
success = ssh2.AuthenticatePw("ssh2Login","ssh2Password")
If (success <> True) Then
    System.DebugLog(ssh2.LastErrorText)
    Return
End If

Dim mailman As New 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
success = mailman.UseSsh(ssh2)
If (success <> True) Then
    System.DebugLog(mailman.LastErrorText)
    Return
End If

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

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

// Establish the POP3 connection through the ssh2 tunnel.
success = mailman.Pop3BeginSession()
If (success <> True) Then
    System.DebugLog(mailman.LastErrorText)
    Return
End If

// Get the number of messages in the mailbox.
Dim numMessages As Int32
numMessages = mailman.GetMailboxCount()

Dim i As Int32
i = 1

Dim email As Chilkat.Email
While i <= numMessages

    email = mailman.FetchByMsgnum(i)
    If (mailman.LastMethodSuccess <> True) Then
        System.DebugLog(mailman.LastErrorText)
        Return
    End If

    System.DebugLog(email.From + ": " + email.Subject + EndOfLine.Unix)

    i = i + 1
Wend

// 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.
success = mailman.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.

ssh2.Disconnect 

ssh1.Disconnect