< Creating the C# UDP Remoting Channel Class Library (Cont) | Main | Chap 13 TOC: .NET Framework Network Security >

 

 

Chapter 12 Part 9:

.NET Remoting

 

 

What do we have in this chapter 12 Part 9?

  1. Creating the C# Custom Remoting Channel Demo Class Library

  2. Creating the C# Remoting Server Program

  3. Creating the C# Remoting Client Program

  4. Testing the Whole UDP Custom Made Channel Remoting Project

Creating the C# Custom Remoting Channel Demo Class Library

 

Create a new C# class library and you may want to use the solution and project name as shown in the following screenshot.

 

Creating the C# Custom Remoting Channel Demo Class Library: creating new C# class library

 

Rename the given default source file name to Demo.cs to reflect the application to be developed.

 

 

Creating the C# Custom Remoting Channel Demo Class Library: renaming the C# source file

 

Add/edit the code as given below. This class demonstrates the Marshal by value and reference.

 

using System;

using System.Diagnostics;

 

namespace DemoUDPChannelCS

{

    /// <summary>

    /// Summary description for Class1.

    /// </summary>

    [Serializable]

    public class InformationBucket

    {

        public int TheValue;

        public string Message;

    }

 

    public class DemoClass : MarshalByRefObject

    {

        private int TheValue = 0;

        private string TheMessage = "";

 

        public void SetTheValue(int InputValue)

        {

            TheValue = InputValue;

            Console.WriteLine("DemoClass: Setting TheValue to {0}", TheValue);

        }

 

        public void SetTheMessage(string Message)

        {

            TheMessage = Message;

            Console.WriteLine("DemoClass: Setting TheMessage to {0}", TheMessage);

        }

 

        public InformationBucket GetCurrentInformation()

        {

            InformationBucket Bucket = new InformationBucket();

 

            Bucket.Message = TheMessage;

            Bucket.TheValue = TheValue;

 

            return Bucket;

        }

    }

}

 

Build the project and make sure there is no error.

 

Creating the C# Custom Remoting Channel Demo Class Library: building the Demo project

 

The following example shows the build messages sample. The DLL was successfully generated.

------ Rebuild All started: Project: DemoUDPChannelCS, Configuration: Debug Any CPU ------

c:\WINDOWS\Microsoft.NET\Framework\v3.5\Csc.exe /noconfig /nowarn:1701,1702 /errorreport:prompt /warn:4 /define:DEBUG;TRACE /reference:"C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\System.Core.dll" /reference:"C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\System.Data.DataSetExtensions.dll" /reference:c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Data.dll /reference:c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.dll /reference:c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Xml.dll /reference:"C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\System.Xml.Linq.dll" /debug+ /debug:full /filealign:512 /optimize- /out:obj\Debug\DemoUDPChannelCS.dll /target:library Demo.cs Properties\AssemblyInfo.cs

 

Compile complete -- 0 errors, 0 warnings

DemoUDPChannelCS -> C:\networkdotnetproject\DemoUDPChannelCS\DemoUDPChannelCS\bin\Debug\DemoUDPChannelCS.dll

========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========

Creating the C# Remoting Server Program

 

Create a new C# console application and you may want to use the solution and project names as shown in the following screenshot.

 

Creating the C# Remoting Server Program: creating new C# remoting server project

 

Rename the default given source file to Servercp.cs to reflect the application to be developed.

 

Creating the C# Remoting Server Program: renaming the C# source file to Servercp.cs

 

Next, let add references to both the demo and UDP custom made channels for remoting. Invoke the Add Reference page.

 

Creating the C# Remoting Server Program: invoking the C# Add Reference page

 

From the Browse page, find and select the UDPChannel.DLL which normally under the project’s \bin\Debug folder. Click OK to add the reference.

 

Creating the C# Remoting Server Program: selecting the DLL file to be referred

 

Then add a reference to the demo DLL class.

 

Creating the C# Remoting Server Program: invoking the Add Reference page again

 

 

 

 

Creating the C# Remoting Server Program: selecting the second reference DLL file

 

Both references should be visible in the Solution Explorer under the References folder.

 

Creating the C# Remoting Server Program: the reference components seen in the Visual Studio Solution Explorer

 

Add/edit the server code as given below.

 

using System;

using System.Runtime.Remoting;

using System.Runtime.Remoting.Channels;

using System.Runtime.Remoting.Channels.Http;

using System.Runtime.Remoting.Channels.Tcp;

using UDPChannelSample;

 

namespace ServerUDPChannelCP

{

    class RemotingServer

    {

        /// <summary>

        /// The main entry point for the application.

        /// </summary>

        [STAThread]

        static void Main(string[ ] args)

        {

            UDPChannel Channel = new UDPChannel(5150);

            // ChannelServices.RegisterChannel(Channel); ----> obsolete

            ChannelServices.RegisterChannel(Channel, false);

            ActivatedServiceTypeEntry myActivatedServiceTypeEntry = new ActivatedServiceTypeEntry(typeof(DemoUDPChannelCS.DemoClass));

            RemotingConfiguration.RegisterActivatedServiceType(myActivatedServiceTypeEntry);

            // Get the registered activated service types .

            ActivatedServiceTypeEntry[ ] myActivatedServiceEntries = RemotingConfiguration.GetRegisteredActivatedServiceTypes();

 

            Console.WriteLine("Information of first registered activated service type :");

            Console.WriteLine("Object type: " + myActivatedServiceEntries[0].ObjectType);

            Console.WriteLine("Description: " + myActivatedServiceEntries[0].ToString());

            Console.WriteLine("Hit any key to exit...");

            Console.ReadLine();

        }

    }

}

 

If you face the problem resolving the Http and Tcp namespaces from the System.Runtime.Remoting.Channels namespaces, you need to add the reference manually as done before. This is bug or what we are not sure, because it also happened in Visual Studio 2005 full or Express edition.

 

Creating the C# Remoting Server Program: the un-resolved System.Runtime.Remoting.Channels namespaces

 

Invoke the Add Reference page.

 

Creating the C# Remoting Server Program: invoking the Add Reference page to add the .NET reference

 

From the .NET page, browse and find the System.Runtime.Remoting namespaces and click OK.

 

Creating the C# Remoting Server Program: selecting System.Runtime.Remoting .NET namespace

 

Next, build the project and make sure there is no error else you need to correct it.

 

Creating the C# Remoting Server Program: building the remoting server project

 

If there is no error, run the project without debugging.

 

Creating the C# Remoting Server Program: running the remoting server project without debugging

 

Unblock the Windows firewall if any.

 

Creating the C# Remoting Server Program: unblocking the Windows firewall that block the TCP/IP custom made connection

 

The following screenshot show a sample server output, waiting a connection from client while implementing the remoting with custom made UDP channel. We need a client program to test the whole project.

 

Creating the C# Remoting Server Program: the remoting server sample console output

 

Creating the C# Remoting Client Program

 

Create a new C# console application and you may want to use the solution and project names as shown in the following screenshot.

 

Creating the C# Remoting Client Program: creating new C# client remoting console application

 

Rename the default given source file name to Clientcp.cs to reflect the application to be developed.

 

Creating the C# Remoting Client Program: renaming the source file

 

As done in the server program, let add references so that all the reference to the UDP custom made channel definition and demo DLL classes can be resolved. Invoke the Add Reference page.

 

Creating the C# Remoting Client Program: invoking the Add Reference page

 

From the Browse page, find and select the UDPChannel.dll, previously created file which normally located under the project’s \bin\Debug folder.

 

Creating the C# Remoting Client Program: selecting the reference DLL

 

Then repeat the same steps for the DemoUDPChannelCS.dll file.

 

Creating the C# Remoting Client Program: selecting and adding the second reference DLL

 

Both references should be visible under the References folder in the Solution Explorer.

 

Creating the C# Remoting Client Program: both references as seen in the Visual Studio Solution Explorer

 

Next, add/edit the code as given below.

 

 

 

 

using System;

using System.Runtime.Remoting;

using System.Runtime.Remoting.Channels;

 

namespace ClientUDPChannelCP

{

    class RemotingClient

    {

        /// <summary>

        /// This is a simple remoting client application that uses the UDP

        /// remoting channel to communicate to the DemoClass.

        /// </summary>

        [STAThread]

        static void Main(string[] args)

        {

            // Remoting Configuration

            UDPChannelSample.UDPChannel Channel = new UDPChannelSample.UDPChannel();

            // ChannelServices.RegisterChannel(Channel); --- obsolete

            ChannelServices.RegisterChannel(Channel, false);

 

            ActivatedClientTypeEntry myActivatedClientTypeEntry = new ActivatedClientTypeEntry(typeof(DemoUDPChannelCS.DemoClass),

                "udp://loopback:5150");

 

            // Register DemoClass on the client end so that it can be activated on the server.

           RemotingConfiguration.RegisterActivatedClientType(myActivatedClientTypeEntry);

            DemoUDPChannelCS.DemoClass DoDemo = new DemoUDPChannelCS.DemoClass();

            DemoUDPChannelCS.DemoClass DoDemo1 = new DemoUDPChannelCS.DemoClass();

 

            DoDemo.SetTheMessage("Client: Hello There!");

            DoDemo1.SetTheMessage("Client: Hello Again!");

 

            DoDemo.SetTheValue(77);

            DemoUDPChannelCS.InformationBucket Bucket1 = DoDemo.GetCurrentInformation();

 

            DoDemo.SetTheMessage("Client: We are still here.");

            DoDemo.SetTheValue(717);

 

            DemoUDPChannelCS.InformationBucket Bucket2 = DoDemo.GetCurrentInformation();

 

            Console.WriteLine("Client: Bucket1 has the value {0} and message {1}", Bucket1.TheValue, Bucket1.Message);

            Console.WriteLine("Client: Bucket2 has the value {0} and message {1}", Bucket2.TheValue, Bucket2.Message);

        }

    }

}

 

Build the client project and make sure there is no error.

 

Creating the C# Remoting Client Program: building the remoting client project

 

Then, run the project without debugging.

 

Creating the C# Remoting Client Program: running the remoting client program without debugging

 

Well, if you encounter the following error when running the client program:

 

...An address incompatible with the requested protocol was used...

 

Please uninstall or disable the IPv6 protocol on your machine temporarily using the Local Area Network Properties page as shown below. This example project was developed for IPv4 while Windows XP Pro SP2 already supported IPv6 and enabled by default in most machines.

 

Creating the C# Remoting Client Program: uninstalling the IPv6 protocol support for Win XP Pro SP2

 

In the real development, you may need to modify the AddressFamily to IPv6 (or other desired address family) or provide auto detection for both IPv4 (InterNetwork) and IPv6 (InterNetworkV6) address families as normally done. The code portion of this issue is shown in the following screenshots which in this case, can be found in the UDPChannel.cs, UDPServerChannel.cs and UDPClientChannel source files.

Creating the C# Remoting Client Program: the IPv6 and other TCP/IP address families

 

 

Creating the C# Remoting Client Program: the IPv6 and other TCP/IP address families accessed through the Visual Studio intellisense

 

The following screenshot shows the client program output with exception thrown because there is no listening server for the defined channel and port number.

 

Creating the C# Remoting Client Program: the remoting client program sample output with thrown exception because there is no listening server socket

 

Testing the Whole UDP Custom Made Channel Remoting Project

 

Firstly open the server program, run it and leave the program in running mode. The server should be in the listening mode for client connection.

 

Testing the Whole UDP Custom Made Channel Remoting Project: The remoting server sample output waiting client connection

 

Then, open a new instance of Visual Studio, open and run the client program.

 

Testing the Whole UDP Custom Made Channel Remoting Project: the client remoting program sample output

 

The following shows the previous server output sample which the client was run two times. You may want to test this client and server program on different computer in a subnet or different subnet whether in the private or public network.

 

Testing the Whole UDP Custom Made Channel Remoting Project: the server remoting sample output when the communication was completed

 

< Creating the C# UDP Remoting Channel Class Library (Cont) | Main | Chap 13 TOC: .NET Framework Network Security >