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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
ssh1: HCkSsh;
success: Boolean;
ssh2: HCkSsh;
imap: HCkImap;

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

ssh1 := CkSsh_Create();

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

// Authenticate using login/password:
success := CkSsh_AuthenticatePw(ssh1,'ssh1Login','ssh1Password');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSsh__lastErrorText(ssh1));
    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 := CkSsh_Create();
success := CkSsh_ConnectThroughSsh(ssh2,ssh1,'serverssh2.com',22);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSsh__lastErrorText(ssh2));
    Exit;
  end;

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

imap := CkImap_Create();

// 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 := CkImap_UseSsh(imap,ssh2);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

CkImap_putSsl(imap,True);
CkImap_putPort(imap,993);

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

// Login
success := CkImap_Login(imap,'myLogin','myPassword');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    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 := CkImap_CreateMailbox(imap,'newFolder');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    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 := CkImap_Disconnect(imap);

// 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.
CkSsh_Disconnect(ssh2);

CkSsh_Disconnect(ssh1);

CkSsh_Dispose(ssh1);
CkSsh_Dispose(ssh2);
CkImap_Dispose(imap);

end;