Delphi ActiveX

Use an Existing Socket SSH Tunnel

Demonstrates the Chilkat MailMan.UseSshTunnel method, which configures MailMan to use an existing SSH tunnel provided by a Socket object for its SMTP and POP3 connections. This example opens and authenticates a tunnel on a Socket, hands it to MailMan, and then verifies an SMTP login through it.

Background: Sharing one already-established SSH tunnel across objects avoids opening (and authenticating) a separate SSH connection for every component that needs to reach the remote network. Here the tunnel lives on a Socket object, which MailMan then routes its SMTP/POP3 traffic through. It is the Socket-based sibling of UseSsh, which shares an Ssh object instead.

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var
success: Integer;
sshTunnel: TChilkatSocket;
mailman: TChilkatMailMan;

begin
success := 0;

//  Demonstrates the MailMan.UseSshTunnel method, which configures MailMan to use an existing
//  SSH tunnel provided by a Socket object for its SMTP and POP3 connections.

//  Open and authenticate the SSH tunnel using a Socket object.
sshTunnel := TChilkatSocket.Create(Self);
success := sshTunnel.SshOpenTunnel('ssh.example.com',22);
if (success = 0) then
  begin
    Memo1.Lines.Add(sshTunnel.LastErrorText);
    Exit;
  end;

success := sshTunnel.SshAuthenticatePw('sshUser','sshPassword');
if (success = 0) then
  begin
    Memo1.Lines.Add(sshTunnel.LastErrorText);
    Exit;
  end;

mailman := TChilkatMailMan.Create(Self);

//  Configure the SMTP server connection.  These connections will travel through the tunnel.
mailman.SmtpHost := 'smtp.example.com';
mailman.SmtpPort := 465;
mailman.SmtpSsl := 1;
mailman.SmtpUsername := 'user@example.com';
mailman.SmtpPassword := 'myPassword';

//  Tell MailMan to route its connections through the existing tunnel.
success := mailman.UseSshTunnel(sshTunnel.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
    Exit;
  end;

//  SMTP operations now travel through the shared SSH tunnel.
success := mailman.VerifySmtpLogin();
if (success = 0) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Authenticated with the SMTP server through the SSH tunnel.');