(Delphi ActiveX) 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.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ssh1: TChilkatSsh;
success: Integer;
ssh2: TChilkatSsh;
imap: TChilkatImap;

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

ssh1 := TChilkatSsh.Create(Self);

// Connect directly to the 1st SSH server.
success := ssh1.Connect('serverssh1.com',22);
if (success <> 1) then
  begin
    Memo1.Lines.Add(ssh1.LastErrorText);
    Exit;
  end;

// Authenticate using login/password:
success := ssh1.AuthenticatePw('ssh1Login','ssh1Password');
if (success <> 1) then
  begin
    Memo1.Lines.Add(ssh1.LastErrorText);
    Exit;
  end;

// 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.
ssh2 := TChilkatSsh.Create(Self);
success := ssh2.ConnectThroughSsh(ssh1.ControlInterface,'serverssh2.com',22);
if (success <> 1) then
  begin
    Memo1.Lines.Add(ssh2.LastErrorText);
    Exit;
  end;

// Authenticate with ssh2...
success := ssh2.AuthenticatePw('ssh2Login','ssh2Password');
if (success <> 1) then
  begin
    Memo1.Lines.Add(ssh2.LastErrorText);
    Exit;
  end;

imap := TChilkatImap.Create(Self);

// 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
success := imap.UseSsh(ssh2.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

imap.Ssl := 1;
imap.Port := 993;

// Connect to an IMAP server (through the multi-hop SSH tunnel)
success := imap.Connect('imap.someimapserver.com');
if (success <> 1) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// Login
success := imap.Login('myLogin','myPassword');
if (success <> 1) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// 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.
success := imap.CreateMailbox('newFolder');
if (success <> 1) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('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.
success := imap.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.
ssh2.Disconnect();

ssh1.Disconnect();
end;