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(Delphi ActiveX) POP3 over Multiple Hop SSHDemonstrates how to read POP3 email (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this: Application => ServerSSH1 => ServerSSH2 => POP3Server Note: This example requires Chilkat v11.0.0 or greater.
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 success: Integer; ssh1: TChilkatSsh; ssh2: TChilkatSsh; mailman: TChilkatMailMan; numMessages: Integer; email: TChilkatEmail; i: Integer; begin success := 0; // This example requires 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 = 0) then begin Memo1.Lines.Add(ssh1.LastErrorText); Exit; end; // Authenticate using login/password: success := ssh1.AuthenticatePw('ssh1Login','ssh1Password'); if (success = 0) 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 = 0) then begin Memo1.Lines.Add(ssh2.LastErrorText); Exit; end; // Authenticate with ssh2... success := ssh2.AuthenticatePw('ssh2Login','ssh2Password'); if (success = 0) then begin Memo1.Lines.Add(ssh2.LastErrorText); Exit; end; mailman := TChilkatMailMan.Create(Self); // Tell the mailman object to connect to the POP3 server though the ssh2 tunnel (which itself is routed through ssh1). // The connection looks like this: Application => ServerSSH1 => ServerSSH2 => POP3Server success := mailman.UseSsh(ssh2.ControlInterface); if (success = 0) then begin Memo1.Lines.Add(mailman.LastErrorText); Exit; end; // Set the POP3 server's hostname mailman.MailHost := 'pop.example.com'; // Set the POP3 login/password. mailman.PopUsername := 'myLogin'; mailman.PopPassword := 'myPassword'; // Establish the POP3 connection through the ssh2 tunnel. success := mailman.Pop3BeginSession(); if (success = 0) then begin Memo1.Lines.Add(mailman.LastErrorText); Exit; end; // Get the number of messages in the mailbox. numMessages := mailman.GetMailboxCount(); email := TChilkatEmail.Create(Self); i := 1; while i <= numMessages do begin // Fetch by the message number (not by the UIDL) success := mailman.FetchOne(0,0,i,email.ControlInterface); if (success = 0) then begin Memo1.Lines.Add(mailman.LastErrorText); Exit; end; Memo1.Lines.Add(email.From + ': ' + email.Subject + #10); i := i + 1; end; // Close the connection with the POP3 server. (This closes the tunnel through ssh2) // The connection with ssh2 is still alive, and may be used for more connections. success := mailman.Pop3EndSession(); // 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; |
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