StreamForwarding.cs :  » Network-Clients » SharpSSH » sharpSshTest » jsch_samples » C# / CSharp Open Source

using System;
using System.Windows.Forms;
using Tamir.SharpSsh.jsch;

/* StreamForwarding.cs
 * ====================================================================
 * The following example was posted with the original JSch java library,
 * and is translated to C# to show the usage of SharpSSH JSch API
 * ====================================================================
 * */
namespace sharpSshTest.jsch_samples{
  /// <summary>
  /// This program will demonstrate the stream forwarding. The given Java
  /// I/O streams will be forwared to the given remote host and port on
  /// the remote side.  It is simmilar to the -L option of ssh command,
  /// but you don't have to assign and open a local tcp port.
  /// You will be asked username, hostname, host:hostport and passwd. 
  /// If everything works fine, System.in and System.out streams will be
  /// forwared to remote port and you can send messages from command line.
  /// </summary>
  public class StreamForwarding
  {
    public static void RunExample(String[] arg)
    {
      int port;

      try
      {
        //Create a new JSch instance
        JSch jsch=new JSch();

        //Prompt for username and server host
        Console.WriteLine("Please enter the user and host info at the popup window...");
        String host = InputForm.GetUserInput
          ("Enter username@hostname",
          Environment.UserName+"@localhost");
        String user=host.Substring(0, host.IndexOf('@'));
        host=host.Substring(host.IndexOf('@')+1);

        //Create a new SSH session
        Session session=jsch.getSession(user, host, 22);

        // username and password will be given via UserInfo interface.
        UserInfo ui=new MyUserInfo();
        session.setUserInfo(ui);
        session.connect();

        //Get from user the remote host and remote host port
        String foo = InputForm.GetUserInput("Enter host and port", "host:port");
        host=foo.Substring(0, foo.IndexOf(':'));
        port=int.Parse(foo.Substring(foo.IndexOf(':')+1));

        Console.WriteLine("System.{in,out} will be forwarded to "+
          host+":"+port+".");
        Channel channel=session.openChannel("direct-tcpip");
        ((ChannelDirectTCPIP)channel).setInputStream(Console.OpenStandardInput());
        ((ChannelDirectTCPIP)channel).setOutputStream(Console.OpenStandardOutput());
        ((ChannelDirectTCPIP)channel).setHost(host);
        ((ChannelDirectTCPIP)channel).setPort(port);
        channel.connect();

        while(!channel.isClosed())
        {
          System.Threading.Thread.Sleep(500);
        }
        channel.disconnect();
        session.disconnect();
      }
      catch(Exception e)
      {
        Console.WriteLine(e);
      }
    }

    /// <summary>
    /// A user info for getting user data
    /// </summary>
    public class MyUserInfo : UserInfo
    {
      /// <summary>
      /// Holds the user password
      /// </summary>
      private String passwd;

      /// <summary>
      /// Returns the user password
      /// </summary>
      public String getPassword(){ return passwd; }

      /// <summary>
      /// Prompt the user for a Yes/No input
      /// </summary>
      public bool promptYesNo(String str)
      {
        return InputForm.PromptYesNo(str);
      }
      
      /// <summary>
      /// Returns the user passphrase (passwd for the private key file)
      /// </summary>
      public String getPassphrase(){ return null; }

      /// <summary>
      /// Prompt the user for a passphrase (passwd for the private key file)
      /// </summary>
      public bool promptPassphrase(String message){ return true; }

      /// <summary>
      /// Prompt the user for a password
      /// </summary>\
      public bool promptPassword(String message)
      {
        passwd=InputForm.GetUserInput(message, true);
        return true;
      }

      /// <summary>
      /// Shows a message to the user
      /// </summary>
      public void showMessage(String message)
      {
        InputForm.ShowMessage(message);
      }
    }
  }
}