?using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.IO;
/// <summary>
/// ProxyHttp 的摘要說(shuō)明
/// </summary>
public class ProxyHttp
{
    Socket clientSocket;
    Byte[] read = new byte[1024];
    //定義一個(gè)空間，存儲(chǔ)來(lái)自客戶(hù)端請(qǐng)求數(shù)據(jù)包
    Byte[] Buffer = null;
    Encoding ASCII = Encoding.ASCII;
    //設(shè)定編碼
    Byte[] RecvBytes = new Byte[4096];
    //定義一個(gè)空間，存儲(chǔ)Web服務(wù)器返回的數(shù)據(jù)
    String clientmsg;
	public ProxyHttp(Socket socket)
	{
		//
		// TODO: 在此處添加構(gòu)造函數(shù)邏輯
		//
        this.clientSocket = socket;
	}
    public void Run()
    {
        string clientmessage = "";
        //存放來(lái)自客戶(hù)端的HTTP請(qǐng)求字符串
        string URL = "";
        //存放解析出地址請(qǐng)求信息
        int bytes = ReadMessage(read, ref clientSocket, ref clientmessage);
        if (bytes == 0)
        {
            return;
        }

        clientmsg = clientmessage;

        int index1 = clientmessage.IndexOf(' ');
        int index2 = clientmessage.IndexOf(' ', index1 + 1);
        if ((index1 == -1) || (index2 == -1))
        {
            throw new IOException();
        }
        string part1 = clientmessage.Substring(index1 + 1, index2 - index1);
        int index3 = part1.IndexOf('/', index1 + 8);
        int index4 = part1.IndexOf(' ', index1 + 8);
        int index5 = index4 - index3;
        URL = part1.Substring(index1 + 4, (part1.Length - index5) - 8);

        try
        {
            IPHostEntry IPHost = Dns.Resolve(URL);
            Console.WriteLine("遠(yuǎn)程主機(jī)名： " + IPHost.HostName);
            string[] aliases = IPHost.Aliases;
            IPAddress[] address = IPHost.AddressList;
            Console.WriteLine("Web服務(wù)器IP地址：" + address[0]);
            //解析出要訪問(wèn)的服務(wù)器地址
            IPEndPoint ipEndpoint = new IPEndPoint(address[0], 80);
            Socket IPsocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            //創(chuàng)建連接Web服務(wù)器端的Socket對(duì)象
            IPsocket.Connect(ipEndpoint);
            //Socket連Web接服務(wù)器
            if (IPsocket.Connected)
                Console.WriteLine("Socket 正確連接！");
            string GET = clientmessage;
            Byte[] ByteGet = ASCII.GetBytes(GET);
            IPsocket.Send(ByteGet, ByteGet.Length, 0);
            //代理訪問(wèn)軟件對(duì)服務(wù)器端傳送HTTP請(qǐng)求命令
            Int32 rBytes = IPsocket.Receive(RecvBytes, RecvBytes.Length, 0);
            //代理訪問(wèn)軟件接收來(lái)自Web服務(wù)器端的反饋信息
            Console.WriteLine("接收字節(jié)數(shù)：" + rBytes.ToString());
            String strRetPage = null;
            strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, rBytes);
            while (rBytes > 0)
            {
                rBytes = IPsocket.Receive(RecvBytes, RecvBytes.Length, 0);
                strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, rBytes);
            }
            IPsocket.Shutdown(SocketShutdown.Both);
            IPsocket.Close();
            SendMessage(clientSocket, strRetPage);
            //代理服務(wù)軟件往客戶(hù)端傳送接收到的信息
        }
        catch (Exception exc2)
        {
            Console.WriteLine(exc2.ToString());
        }
    }
    //接收客戶(hù)端的HTTP請(qǐng)求數(shù)據(jù)
    private int ReadMessage(byte[] ByteArray, ref Socket s, ref String clientmessage)
    {
        int bytes = s.Receive(ByteArray, 1024, 0);
        string messagefromclient = Encoding.ASCII.GetString(ByteArray);
        clientmessage = (String)messagefromclient;
        return bytes;
    }
    //傳送從Web服務(wù)器反饋的數(shù)據(jù)到客戶(hù)端
    private void SendMessage(Socket s, string message)
    {
        Buffer = new Byte[message.Length + 1];
        int length = ASCII.GetBytes(message, 0, message.Length, Buffer, 0);
        Console.WriteLine("傳送字節(jié)數(shù)：" + length.ToString());
        s.Send(Buffer, length, 0);
    }
}