(Lianja) IMAP over Multiple Hop SSH

Demonstrates how to read IMAP email (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2 => IMAPServer

The ConnectThroughSsh and UseSsh methods are added in Chilkat version 9.5.0.55 to accomplish this task.

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// This example assumes 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

loImap = createobject("CkImap")

// Tell the IMAP object to connect to the IMAP server though the ssh2 tunnel (which itself is routed through ssh1).
// The connection looks like this:  Application => ServerSSH1 => ServerSSH2 => IMAPServer
llSuccess = loImap.UseSsh(loSsh2)
if (llSuccess <> .T.) then
    ? loImap.LastErrorText
    release loSsh1
    release loSsh2
    release loImap
    return
endif

loImap.Ssl = .T.
loImap.Port = 993

// Connect to an IMAP server (through the multi-hop SSH tunnel)
llSuccess = loImap.Connect("imap.someimapserver.com")
if (llSuccess <> .T.) then
    ? loImap.LastErrorText
    release loSsh1
    release loSsh2
    release loImap
    return
endif

// Login
llSuccess = loImap.Login("myLogin","myPassword")
if (llSuccess <> .T.) then
    ? loImap.LastErrorText
    release loSsh1
    release loSsh2
    release loImap
    return
endif

// Do whatever needs to be done...  for example,

// Create the new email folder (sub-mailbox) on the IMAP server.
// If no folder path is provided, the new folder is a sub-mailbox of Inbox.
llSuccess = loImap.CreateMailbox("newFolder")
if (llSuccess <> .T.) then
    ? loImap.LastErrorText
    release loSsh1
    release loSsh2
    release loImap
    return
endif

? "Success."

// Close the connection with the IMAP server.  (This closes the tunnel through ssh2)
// The connection with ssh2 is still alive, and may be used for more connections.
llSuccess = loImap.Disconnect()

// 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 loImap