// The Server
using System;
using System.Net.Sockets;
using System.Net;
using System.IO;
using System.Collections;

namespace GrabPageServer
{
	class GrabPageServer
	{
		static void Send(string message, NetworkStream socketStream)
		{
			char[] theMessage;
			theMessage = message.ToCharArray();
			for ( int i = 0; i < theMessage.Length; i++ ) socketStream.WriteByte( (byte) theMessage[i] );
		}

		static void Main()
		{
			TcpListener server = null;
			Socket connection = null;
			int port = 80;
			NetworkStream socketStream = null;
//			BinaryWriter writer = null;
//			BinaryReader reader = null;
			ArrayList theRequest = new ArrayList();
			string tehRequest = "";

			// wait for a client connection and display the text the client sends
			try
			{                               
				// create TcpListener
				server = new TcpListener( port );
                                
				// start TcpListener to wait for the next connection request
				server.Start();

				Console.WriteLine("Waiting for connection...\r\n");

				// establish connection upon client request
				while ( true )
				{
					// accept an incoming connection
					connection = server.AcceptSocket();
                
					// create NetworkStream object associated with socket
					socketStream = new NetworkStream( connection );

					// chain it to BinaryWriter and BinaryReader
//					writer = new BinaryWriter( socketStream );
//					reader = new BinaryReader( socketStream );

					// get client's IP address and port
					IPEndPoint ipend = (IPEndPoint) connection.RemoteEndPoint;
					
					// read the HTTP request from the client
					int c = 0;
					int d = 0;
					while (d != ((int) '\r' + (int) '\n'))
					{
						d = c;
						c = socketStream.ReadByte();
						if (c == '\r') d += c;
						theRequest.Add((char) c);
					}
					foreach (char message in theRequest) tehRequest += message;
					theRequest.Clear();

					// show where the client is from and the HTTP request
					Console.WriteLine( "Connection from " + ipend.Address + " via its port " + ipend.Port + " with the following request: ");
					Console.Write( tehRequest );
					tehRequest = "";

					// send the greeting message to the client
					Send("HTTP/1.1 200 OK\r\n", socketStream);
					Send("Date: " + System.DateTime.UtcNow.ToString("ddd, dd MMM yyyy HH:mm:ss") + " GMT\r\n", socketStream);
					Send("Server: CrazyHTTP/1.0\r\n", socketStream);
					Send("Connection: close\r\n", socketStream);
					Send("Content-Type: text/html\r\n\r\n", socketStream);
					Send("<html><h1>Greetings from the Server!</h1></html>\r\n", socketStream);

					// close the connection
					socketStream.Close();
					connection.Close();
				}
			}
			catch (Exception e)
			{
				Console.WriteLine(e.ToString());
			}
		}
	}
}

// The Client
using System;
using System.Net.Sockets;
using System.IO;

namespace GrabPageClient
{
	class GrabPageClient
	{
		static void Send(string message, NetworkStream NetIO)
		{
			char[] theMessage;
			theMessage = message.ToCharArray();
			for ( int i = 0; i < theMessage.Length; i++ ) NetIO.WriteByte( (byte) theMessage[i] );
		}

		static void Main()
		{
			TcpClient client = null;
			string hostname = "";
			string hostURL = "";
			char[] hostURLArray;
			int port = 80;
			NetworkStream netIO = null;
//			BinaryWriter writer = null;
//			BinaryReader reader = null;
			string message = "";

			Console.Write("\r\nEnter server hostname or IP address (. to end): ");
			hostname = Console.ReadLine();

			while (hostname != ".") 
			{						
				try
				{ 	
					Console.WriteLine( "Attempting connection..." );
					client = new TcpClient();

					client.Connect( hostname, port );
					Console.WriteLine( "\r\nConnected to Web server at " + hostname );	

					netIO = client.GetStream();
//					writer = new BinaryWriter( netIO );
//					reader = new BinaryReader( netIO );
					Console.WriteLine( "\r\nGot I/O streams." );				

					try
					{	
						//hostURL = "GET / HTTP/1.0 \r\n\r\n";
						//hostURLArray = hostURL.ToCharArray();
						//writer.Write( hostURLArray );
						Send("GET / HTTP/1.0 \r\n\r\n", netIO);
						Console.WriteLine("Sent request..\r\n");

						int c = 0;
						while ( c != -1 )
						{
							c = netIO.ReadByte();
							message = ((char) c).ToString();
							Console.Write( message );
						}

					}
					// handle exception if error in reading server data
					catch ( Exception )
					{
						Console.WriteLine("\r\nThe server stopped the connection!");
						System.Environment.Exit( System.Environment.ExitCode );
					}
				}
				// handle exception for error in establishing connection
				catch ( Exception )
				{
					Console.WriteLine( "\r\n" );
				}			

				netIO.Close();
				client.Close();

				Console.Write("\r\nEnter server hostname or IP address (. to end): ");
				hostname = Console.ReadLine();
			}
		}
	}
}