VBScript

IMAP Use Existing SSH Tunnel

Demonstrates how to connect to an IMAP server using an existing SSH tunnel. This creates a new channel within the SSH tunnel, which can be a TCP or TLS connection, and is connected to a remote IMAP server through port forwarding. VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

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

set tunnel = CreateObject("Chilkat.Socket")

sshHostname = "sftp.example.com"
sshPort = 22

' Connect to an SSH server and establish the SSH tunnel:
success = tunnel.SshOpenTunnel(sshHostname,sshPort)
If (success = 0) Then
    outFile.WriteLine(tunnel.LastErrorText)
    WScript.Quit
End If

' 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 IMAP server, it is
' for authenticating with the SSH server, which is separate.
success = tunnel.SshAuthenticatePw("mySshLogin","mySshPassword")
If (success = 0) Then
    outFile.WriteLine(tunnel.LastErrorText)
    WScript.Quit
End If

' OK, the SSH tunnel is setup.  Now open a channel within the tunnel.
' Once the channel is obtained, the Socket API may
' be used exactly the same as usual, except all communications
' are sent through the channel in the SSH tunnel.
' Any number of channels may be created from the same SSH tunnel.
' Multiple channels may coexist at the same time.

set imap = CreateObject("Chilkat.Imap")

' Let the IMAP object also use the SSH tunnel
success = imap.UseSshTunnel(tunnel)
If (success = 0) Then
    outFile.WriteLine(imap.LastErrorText)
    WScript.Quit
End If

' Connect to an IMAP server via the already established SSH tunnel.
' Because the SSH tunnel has been previously setup,
' this does not establish a direct connection with the IMAP
' server.  It directs the SSH server to establish the connection.

' In this example, the IMAP server requires SSL/TLS.  The TLS connection
' will be enclosed within the SSH tunnel.
imap.Ssl = 1
imap.Port = 993
success = imap.Connect("imap.my-imap-server.com")
If (success = 0) Then
    outFile.WriteLine(imap.LastErrorText)
    WScript.Quit
End If

' Authenticate with the IMAP server via the SSH tunnel.
success = imap.Login("myLogin","myPassword")
If (success = 0) Then
    outFile.WriteLine(imap.LastErrorText)
    WScript.Quit
End If

' Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
If (success = 0) Then
    outFile.WriteLine(imap.LastErrorText)
    WScript.Quit
End If

' How many messages in Inbox?
msgCount = imap.NumMessages
If (msgCount = 0) Then
    outFile.WriteLine("No messages found.")
    WScript.Quit
End If

upperBound = 10
If (msgCount < upperBound) Then
    upperBound = msgCount
End If

' Download up to the 1st 10 messages.
set email = CreateObject("Chilkat.Email")

bUid = 0
For i = 1 To upperBound

    success = imap.FetchEmail(0,i,bUid,email)
    If (success = 0) Then
        outFile.WriteLine(imap.LastErrorText)
        WScript.Quit
    End If

    outFile.WriteLine(email.From)
    outFile.WriteLine(email.Subject)

Next

' Disconnect from the IMAP server.
' The SSH tunnel remains open.
success = imap.Disconnect()
If (success = 0) Then
    outFile.WriteLine(imap.LastErrorText)
    WScript.Quit
End If

' It is possible to re-use the existing SSH tunnel for the next connection:
success = imap.Connect("imap.my-imap-server2.com")
If (success = 0) Then
    outFile.WriteLine(imap.LastErrorText)
    WScript.Quit
End If

' Review the LastErrorText to see that the connection was made via the SSH tunnel:
outFile.WriteLine(imap.LastErrorText)

' This closes the SSH channel, which is the connection with the IMAP server.
' It does not close the SSH tunnel
success = imap.Disconnect()
If (success = 0) Then
    outFile.WriteLine(imap.LastErrorText)
    WScript.Quit
End If

' Finally, close the SSH tunnel.

' Note: If other objects are using the same SSH tunnel, the tunnel is not 
' actually closed.  It is only closed when the last object using the tunnel closes it.

' At this point, both the imap and tunnel objects have references to the internal
' SSH tunnel.  We need to close each.

' This call doesn't actually close the tunnel yet, because the tunnel object still
' holds an internal reference.
success = imap.SshCloseTunnel()
If (success = 0) Then
    outFile.WriteLine(imap.LastErrorText)
    WScript.Quit
End If

' This actually closes the SSH tunnel because it's the last object using it.
success = tunnel.SshCloseTunnel()
If (success = 0) Then
    outFile.WriteLine(tunnel.LastErrorText)
    WScript.Quit
End If

outFile.WriteLine("IMAP pre-existing SSH tunnel example completed.")

outFile.Close