Socket通信:服务端发送安全策略到flash(c#)

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原文链接：http://www.cnblogs.com/ryb/archive/2011/01/28/1946790.html

文章标签：

#c# #网络

在Adobe Flash Player升级至9.0.124版本后，因安全策略改变，http方式加载策略不再适用，需使用xmlsocket://方式。本文介绍如何设置843端口提供安全策略。

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在Adobe Flash Player升级到9.0.124后，由于安全策略的更改，使得在socket或xmlsocket的应用里，原先如用http方式加载安全策略的手段不能继续使用了，类似此类应用必须使用xmlsocket://方式来提供安全策略。flashplayer的安全策略检测过程如下：

1,首先检测目标服务器的843端口是否提供安全策略

2,如果1没有检测到策略，则检测actionscript是否使用了

Security.loadPolicyFile(xmlsocket://)

手段提供安全策略，如果还没检测到，则使用第3步检测

3,检测目标服务器目标端口是否提供安全策略

C#代码如下，编译环境VS2008 + .NET framework 3.5

using System;

using System.Text;

using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Collections;

namespace serverSocket
{
    class Program
    {
        private Thread Beginthread, receivethread;
        private Socket serverSocket, ClientSocket;

        static void Main(string[] args)
        {
            Program program = new Program();

            IPEndPoint remotePoint = new IPEndPoint(IPAddress.Any, 843);

            program.serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            program.serverSocket.Bind(remotePoint);
            program.serverSocket.Listen(10);

            Console.WriteLine("Listening...");
            program.Beginthread = new Thread(new ThreadStart(program.BeginListen));
            program.Beginthread.Start();
        }

        private void BeginListen()
        {
            while (true)
            {
                ClientSocket = serverSocket.Accept();
                receivethread = new Thread(new ThreadStart(receive));
                receivethread.Start();
            }
        }

        private void receive()
        {
            IPEndPoint clienTep = (IPEndPoint)ClientSocket.RemoteEndPoint;

            int bytes = 0;

            while (true)
            {
                Byte[] buffer = new Byte[24];
                bytes = ClientSocket.Receive(buffer);

                if (bytes > 0)
                {
                    string clientCommand = Encoding.UTF8.GetString(buffer, 0, bytes);

                    String policy = "<cross-domain-policy><allow-access-from domain=\"*\" to-ports=\"2999\" /></cross-domain-policy>\0";

                    buffer = System.Text.Encoding.UTF8.GetBytes(policy.ToCharArray());

                    ClientSocket.Send(buffer, buffer.Length, 0);
                }
                else
                {
                    break;
                }
            }

            ClientSocket.Close();
            receivethread.Abort();
        }
    }
}