Pascal (Lazarus/Delphi)

Multiple Hop SSH to SFTP

See more SFTP Examples

Demonstrates how to SFTP through an intermediate SSH server (multiple hop). The scheme looks like this:

Application => ServerSSH1 => ServerSFtp

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task.

Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.SFtp,
  Chilkat.Ssh;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  ssh1: TSsh;
  hostname: string;
  port: string;
  sftp: TSFtp;
  remoteFilePath: string;
  localFilePath: string;

begin
  success := False;

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

  ssh1 := TSsh.Create;

  //  Hostname may be an IP address or domain name:
  hostname := '192.168.1.111';
  port := 22;

  //  Connect directly to the 1st SSH server:
  success := ssh1.Connect(hostname,port);
  if (success <> True) then
    begin
      WriteLn(ssh1.LastErrorText);
      Exit;
    end;

  //  Authenticate using login/password:
  success := ssh1.AuthenticatePw('myLogin','myPassword');
  if (success <> True) then
    begin
      WriteLn(ssh1.LastErrorText);
      Exit;
    end;

  //  Connect through the 1st SSH connection to reach a 2nd SSH server (for SFTP)
  //  Note: Any number of connections may be simultaneously tunneled through a single
  //  existing SSH connection.
  sftp := TSFtp.Create;

  //  Connect to some SSH/SFTP server through ssh1.
  success := sftp.ConnectThroughSsh(ssh1,'sftp.someremoteserver.com',22);
  if (success <> True) then
    begin
      WriteLn(sftp.LastErrorText);
      Exit;
    end;

  //  Authenticate with the SFTP server. 
  success := sftp.AuthenticatePw('myLogin','myPassword');
  if (success <> True) then
    begin
      WriteLn(sftp.LastErrorText);
      Exit;
    end;

  //  After authenticating, the SFTP subsystem must be initialized:
  success := sftp.InitializeSftp();
  if (success <> True) then
    begin
      WriteLn(sftp.LastErrorText);
      Exit;
    end;

  //  Upload from the local file to the SSH server.
  //  Important -- the remote filepath is the 1st argument,
  //  the local filepath is the 2nd argument;
  remoteFilePath := 'hamlet.xml';
  localFilePath := 'c:/temp/hamlet.xml';

  success := sftp.UploadFileByName(remoteFilePath,localFilePath);
  if (success <> True) then
    begin
      WriteLn(sftp.LastErrorText);
      Exit;
    end;

  WriteLn('Success.');

  //  Close the connection with the SFTP server.(This closes the the tunnel through ssh1.)
  //  The connection with ssh1 is still alive, and may be used for more connections.
  sftp.Disconnect();

  //  ...
  //  ...
  //  ...

  ssh1.Disconnect();


  ssh1.Free;
  sftp.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.