Connect to UNIX - Sockets

I have dozens of ID's and Passwords to UNIX servers that require a password change ever 60 days.  I want to create Windows Application to manage my UNIX passwords.  I'm willing to start small.  I need help issuing simple UNIX commands through TCP/IP.  Each of the UNIX boxes have a telnet listener on port 23.  I'd like to utilize this to initiate a conversation.

I have read the following links but need additional help:
1) http://www.experts-exchange.com/Programming/Programming_Languages/C_Sharp/Q_20384598.html?query=UNIX&searchType=topic
2) http://www.gotdotnet.com/community/usersamples/Default.aspx?query=telnet
3) http://groups.google.com/groups?q=C%23+connect+to+UNIX&hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=ccdac0da.0309062106.375c5cde%40posting.google.com&rnum=7
4) http://www.private.org.il/mini-tcpip.faq.html#3.%20Of%20the%20rexec%20protocol.


Below is the code I'm using to no avail.  I get a 3 funky characters returned.  A triangle,  } and $.  I must be doing something wrong.



using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Configuration;

namespace RemoteConsole
{
      /// <summary>
      /// RemoteConsoleClient
      /// </summary>
      class RemoteConsoleClient
      {
            TcpClient tcpClient;
            NetworkStream networkStream;
            
            private byte[] buffer = new byte[400];
            
            private AsyncCallback callBack;

            AutoResetEvent evtSessionEnd = new AutoResetEvent(false);
            StreamWriter streamWriter;

            public RemoteConsoleClient()
            {
                  //string Host = "localhost";
                  string Host = "serverDNS";
                  int HostPort = 23;

                  // Fetch Host from the configuration file
                  Host = ConfigurationSettings.AppSettings.Get("Host");
                  if (Host == null)
                        Host = "serverDNS";

                  // Fetch HostPort from the configuration file
                  try
                  {
                        HostPort = Int32.Parse(ConfigurationSettings.AppSettings.Get("HostPort"));
                  }
                  catch
                  {
                        // if no configuration file found - the port value will stay intact (default)
                  }
                  
                  // Connect to the RemoteConsole Server
                  tcpClient = new TcpClient();
                  
                  try
                  {
                        tcpClient.Connect(Host, HostPort);
                  }
                  catch
                  {
                        Console.WriteLine("Can't connect server " + Host + " on port " + HostPort.ToString());
                        tcpClient = null;
                        return;
                  }

                  // Tune the connection
                  tcpClient.ReceiveTimeout = 5;
                  tcpClient.SendTimeout = 5;
                  tcpClient.NoDelay = true;

                  // Get the network stream
                  networkStream = tcpClient.GetStream();

                  // initialize a callback waiting for the information from the stream
                  callBack = new AsyncCallback(OnCompletedRead);
                  networkStream.BeginRead(buffer, 0, buffer.Length, callBack, null);
                  streamWriter = new StreamWriter(networkStream);
                  streamWriter.AutoFlush = true;
            }

            /// <summary>
            /// Callback function, waiting for the information from the network stream
            /// </summary>
            void OnCompletedRead(IAsyncResult asyncResult)
            {
                  if (asyncResult == null)
                        Shutdown();

                  try
                  {
                        int bytesRead = networkStream.EndRead(asyncResult);

                        if (bytesRead > 0)
                        {
                              // Trnaslate the data to the string and dump it to the console
                              String str = Encoding.ASCII.GetString(buffer, 0, bytesRead);
                              Console.Write(str);
                  
                              // Reinitialize callback
                              networkStream.BeginRead(buffer, 0, buffer.Length, callBack, null);
                        }
                        else
                              // the connection was terminated by the server side
                              Shutdown();
                  }
                  catch
                  {
                        // the connection was terminated by the server side
                        Shutdown();
                  }
            }

            /// <summary>
            /// Main Console thread
            /// </summary>
            public void Run()
            {
                  // if there is no connection - even don't start the interaction with the user
                  if (tcpClient == null)
                  {
                        return;
                  }

                  Console.WriteLine("Type \"exit\" to close the remote session.\n");

                  // Receive the commands from the console and send them to the server.
                  string str;
                  do
                  {
                        str = Console.ReadLine();

                        if (tcpClient != null)
                              streamWriter.WriteLine(str);
                        else
                              break;
                  } while (str.ToLower() != "exit");

                  // Shutdown the network connection
                  Shutdown();
            }

            /// <summary>
            /// Shuts the connection down
            /// </summary>
            public void Shutdown()
            {
                  // Shutdown the network connection
                  if (tcpClient != null)
                  {
                        lock(tcpClient)
                        {
                              try
                              {
                                    streamWriter.Close();
                                    networkStream.Close();
                                    tcpClient.Close();
                              }
                              catch
                              {
                              }

                              Console.WriteLine("\nThe session was closed.");

                              tcpClient = null;
                        }
                  }
            }

            /// <summary>
            /// The main entry point for the application.
            /// </summary>
            [STAThread]
            static void Main(string[] args)
            {
                  RemoteConsoleClient client = new RemoteConsoleClient();
                  client.Run();
            }
      }
}
LVL 2
jbauer22Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

testnCommented:
connect to telnet requires some handshake.... use the library here....
http://www.c-sharpcorner.com/Code/2003/Jan/TelnetScripting.asp
0
jbauer22Author Commented:
testn,

Can you provide a code example on how to use this dll to connect to UNIX.
0
jbauer22Author Commented:
Please?  When I use the connect method it appears to return at box and }$.

Need help.
0
testnCommented:
It will work with OpenVMS only. To make it work with regular unix server, you have to incorporate the stuff from http://www.csharphelp.com/archives/archive239.html

Sorry that I don't have time to make it work.

0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C#

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.