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using System;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Threading;
namespace WebProxy2
{
class Program
{
static void Main(string[] args)
{
const int localport = 12000;
const string localaddress = "127.0.0.1";
IPAddress localAddr = IPAddress.Parse(localaddress);
TcpListener tcplistener = new TcpListener(localAddr, localport);
Console.WriteLine("Listening on port {0}", + localport);
tcplistener.Start();
while (true)
{
Socket socket = tcplistener.AcceptSocket();
WebProxy2 webproxy = new WebProxy2(socket);
Thread thread = new Thread(new ThreadStart(webproxy.run));
thread.Start();
}
}
class WebProxy2
{
const int remoteport = 12002;
const string remoteaddr = "localhost";
Socket clientSocket = null;
Byte[] read = new byte[1024];
Byte[] Buffer = null;
Encoding ASCII = Encoding.ASCII;
Byte[] RecvBytes = new Byte[4096];
//Constructeur de la classe
public WebProxy2(Socket socket)
{
this.clientSocket = socket;
}
public void run()
{
String clientmessage = " ";
//Lecture des donnees recues de la connexion cliente du serveur
int bytes = readmessage(read, ref clientSocket, ref clientmessage);
if (bytes == 0)
{
return;
}
Console.WriteLine("Connection from {0}", clientSocket.RemoteEndPoint);
Console.WriteLine("< " + clientmessage);
try
{
IPAddress ip = IPAddress.Parse(GetAdr(remoteaddr));
IPEndPoint ipEnd = new IPEndPoint(ip, remoteport);
Socket IPsocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPsocket.Connect(ipEnd);
if (IPsocket.Connected)
Console.WriteLine("Socket connect OK");
if ((IPsocket.Connected) && clientmessage != " ")
{
//On renvoi les donnees recue de la connection initiale vers la remote socket
string GET = clientmessage;
Byte[] ByteGet = ASCII.GetBytes(GET);
IPsocket.Send(ByteGet, ByteGet.Length, 0);
clientmessage = " ";
}
//On receptionne les donnees de la connection distante (remote socket)
Int32 rBytes = IPsocket.Receive(RecvBytes, 0, SocketFlags.None);
Console.WriteLine("Recieved {0}", +rBytes);
//Formatage en byte des donnees recues du remote socket
String strRetPage = null;
strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, rBytes);
while (rBytes > 0)
{
rBytes = IPsocket.Receive(RecvBytes, RecvBytes.Length, SocketFlags.None);
strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, rBytes);
}
IPsocket.Shutdown(SocketShutdown.Both);
IPsocket.Close();
if ((clientSocket.Connected) && (strRetPage != ""))
sendmessage(clientSocket, strRetPage);
Thread.Sleep(30);
}
catch (Exception exc2)
{
Console.WriteLine(exc2.ToString());
}
}
//Lecture socket
private int readmessage(byte[] ByteArray, ref Socket s, ref String clientmessage)
{
int bytes = s.Receive(ByteArray, 1024, SocketFlags.None);
string messagefromclient = Encoding.ASCII.GetString(ByteArray);
clientmessage = (String)messagefromclient;
return bytes;
}
//Ecriture socket
private void sendmessage(Socket s, string message)
{
Buffer = new Byte[message.Length + 1];
int length = ASCII.GetBytes(message, 0, message.Length, Buffer, 0);
s.Send(Buffer, length, 0);
}
//Recupere l'addresse ip par rapport un nom de domaine
private String GetAdr(string addr)
{
try
{
IPHostEntry iphostentry = Dns.GetHostByName(addr);
String IPStr = "";
foreach (IPAddress ipaddress in iphostentry.AddressList)
{
IPStr = ipaddress.ToString();
return IPStr;
}
}
catch (SocketException E)
{
Console.WriteLine(E.Message.ToString());
}
return "";
}
//Revoit les donnees a partir d'une socket (cette fonction ne sert pas pour l'instant)
private void Receive(Socket socket, byte[] buffer, int offset, int size, int timeout)
{
int startTickCount = Environment.TickCount;
int received = 0; // how many bytes is already received
do
{
if (Environment.TickCount > startTickCount + timeout)
throw new Exception("Timeout.");
try
{
received += socket.Receive(buffer, offset + received, size - received, SocketFlags.None);
}
catch (SocketException ex)
{
if (ex.SocketErrorCode == SocketError.WouldBlock ||
ex.SocketErrorCode == SocketError.IOPending ||
ex.SocketErrorCode == SocketError.NoBufferSpaceAvailable)
{
// socket buffer is probably empty, wait and try again
Thread.Sleep(30);
}
else
throw ex; // any serious error occurr
}
} while (received > 0);
}
}
}
} |
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