转---.net framework4.0基于Socket封装成WebSocket
公司的项目是基于.net4.0搭建起来的，有客户的需求是基于WebSocket通讯请求的，但好像WebSocket支持的.net最低版本为4.5。
为了实现这个需求，结合网上找到的例子，自己封装了一个基于Socket的WebSocket，可能存在一定的Bug，欢迎大家指正。
using System; using System.Collections.Generic; using System.Linq; using System.Net.Sockets; using System.Text; namespace SocketDemo { public class Session { private Socket _sockeclient; private byte[] _buffer; private string _ip; private bool _isweb = false; public Socket SockeClient { set { _sockeclient = value; } get { return _sockeclient; } } public byte[] buffer { set { _buffer = value; } get { return _buffer; } } public string IP { set { _ip = value; } get { return _ip; } } public bool isWeb { set { _isweb = value; } get { return _isweb; } } } }
封装Socket的WebSocket类：
using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Net.Sockets; using System.Security.Cryptography; using System.Text; using System.Text.RegularExpressions; namespace SocketDemo { public class WebSocket { private Dictionary<string, Session> SessionPool = new Dictionary<string, Session>(); #region 启动WebSocket服务 ////// 启动WebSocket服务 /// public void start(int port) { Socket SockeServer = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); SockeServer.Bind(new IPEndPoint(IPAddress.Any, port)); SockeServer.Listen(20); SockeServer.BeginAccept(new AsyncCallback(Accept), SockeServer); Console.WriteLine("服务已启动"); Console.WriteLine("按任意键关闭服务"); Console.ReadLine(); } #endregion #region 处理客户端连接请求 /// /// 处理客户端连接请求 /// /// private void Accept(IAsyncResult socket) { // 还原传入的原始套接字 Socket SockeServer = (Socket)socket.AsyncState; // 在原始套接字上调用EndAccept方法，返回新的套接字 Socket SockeClient = SockeServer.EndAccept(socket); byte[] buffer = new byte[4096]; try { //接收客户端的数据 SockeClient.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback(Recieve), SockeClient); //保存登录的客户端 Session session = new Session(); session.SockeClient = SockeClient; session.IP = SockeClient.RemoteEndPoint.ToString(); session.buffer = buffer; lock (SessionPool) { if (SessionPool.ContainsKey(session.IP)) { this.SessionPool.Remove(session.IP); } this.SessionPool.Add(session.IP, session); } //准备接受下一个客户端 SockeServer.BeginAccept(new AsyncCallback(Accept), SockeServer); Console.WriteLine(string.Format("客户端 {0} 连接成功", SockeClient.RemoteEndPoint)); } catch (Exception ex) { Console.WriteLine("Error : " + ex.ToString()); } } #endregion #region 处理接收的数据 /// /// 处理接受的数据 /// /// private void Recieve(IAsyncResult socket) { Socket SockeClient = (Socket)socket.AsyncState; string IP = SockeClient.RemoteEndPoint.ToString(); if (SockeClient == null || !SessionPool.ContainsKey(IP)) { return; } try { int length = SockeClient.EndReceive(socket); byte[] buffer = SessionPool[IP].buffer; SockeClient.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback(Recieve), SockeClient); string msg = Encoding.UTF8.GetString(buffer, 0, length); // websocket建立连接的时候，除了TCP连接的三次握手，websocket协议中客户端与服务器想建立连接需要一次额外的握手动作 if (msg.Contains("Sec-WebSocket-Key")) { SockeClient.Send(PackageHandShakeData(buffer, length)); SessionPool[IP].isWeb = true; return; } if (SessionPool[IP].isWeb) { msg = AnalyzeClientData(buffer, length); } byte[] msgBuffer = PackageServerData(msg); foreach (Session se in SessionPool.Values) { se.SockeClient.Send(msgBuffer, msgBuffer.Length, SocketFlags.None); } } catch { try { SockeClient.Disconnect(true); } catch { SockeClient.Dispose(); } Console.WriteLine("客户端 {0} 断开连接", IP); SessionPool.Remove(IP); } } #endregion #region 客户端和服务端的响应 /* * 客户端向服务器发送请求 * GET / HTTP/1.1 * Origin: http://localhost:8064 * Sec-WebSocket-Key: vDyPp55hT1PphRU5OAe2Wg== * Connection: Upgrade * Upgrade: Websocket *Sec-WebSocket-Version: 13 * User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko * Host: localhost:8064 * DNT: 1 * Cache-Control: no-cache * Cookie: DTRememberName=admin * * 服务器给出响应 * HTTP/1.1 101 Switching Protocols * Upgrade: websocket * Connection: Upgrade * Sec-WebSocket-Accept: xsOSgr30aKL2GNZKNHKmeT1qYjA= * * 在请求中的“Sec-WebSocket-Key”是随机的，服务器端会用这些数据来构造出一个SHA-1的信息摘要。把“Sec-WebSocket-Key”加上一个魔幻字符串 * “258EAFA5-E914-47DA-95CA-C5AB0DC85B11”。使用 SHA-1 加密，之后进行 BASE-64编码，将结果做为 “Sec-WebSocket-Accept” 头的值，返回给客户端 */ #endregion #region 打包请求连接数据 /// /// 打包请求连接数据 /// /// /// /// private byte[] PackageHandShakeData(byte[] handShakeBytes, int length) { string handShakeText = Encoding.UTF8.GetString(handShakeBytes, 0, length); string key = string.Empty; Regex reg = new Regex(@"Sec\-WebSocket\-Key:(.*?)\r\n"); Match m = reg.Match(handShakeText); if (m.Value != "") { key = Regex.Replace(m.Value, @"Sec\-WebSocket\-Key:(.*?)\r\n", "$1").Trim(); } byte[] secKeyBytes = SHA1.Create().ComputeHash(Encoding.ASCII.GetBytes(key + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11")); string secKey = Convert.ToBase64String(secKeyBytes); var responseBuilder = new StringBuilder(); responseBuilder.Append("HTTP/1.1 101 Switching Protocols" + "\r\n"); responseBuilder.Append("Upgrade: websocket" + "\r\n"); responseBuilder.Append("Connection: Upgrade" + "\r\n"); responseBuilder.Append("Sec-WebSocket-Accept: " + secKey + "\r\n\r\n"); return Encoding.UTF8.GetBytes(responseBuilder.ToString()); } #endregion #region 处理接收的数据 /// /// 处理接收的数据 /// /// /// /// private string AnalyzeClientData(byte[] recBytes, int length) { int start = 0; // 如果有数据则至少包括3位 if (length < 2) return ""; // 判断是否为结束针 bool IsEof = (recBytes[start] >> 7) > 0; // 暂不处理超过一帧的数据 if (!IsEof) return ""; start++; // 是否包含掩码 bool hasMask = (recBytes[start] >> 7) > 0; // 不包含掩码的暂不处理 if (!hasMask) return ""; // 获取数据长度 UInt64 mPackageLength = (UInt64)recBytes[start] & 0x7F; start++; // 存储4位掩码值 byte[] Masking_key = new byte[4]; // 存储数据 byte[] mDataPackage; if (mPackageLength == 126) { // 等于126 随后的两个字节16位表示数据长度 mPackageLength = (UInt64)(recBytes[start] << 8 | recBytes[start + 1]); start += 2; } if (mPackageLength == 127) { // 等于127 随后的八个字节64位表示数据长度 mPackageLength = (UInt64)(recBytes[start] << (8 * 7) | recBytes[start] << (8 * 6) | recBytes[start] << (8 * 5) | recBytes[start] << (8 * 4) | recBytes[start] << (8 * 3) | recBytes[start] << (8 * 2) | recBytes[start] << 8 | recBytes[start + 1]); start += 8; } mDataPackage = new byte[mPackageLength]; for (UInt64 i = 0; i < mPackageLength; i++) { mDataPackage[i] = recBytes[i + (UInt64)start + 4]; } Buffer.BlockCopy(recBytes, start, Masking_key, 0, 4); for (UInt64 i = 0; i < mPackageLength; i++) { mDataPackage[i] = (byte)(mDataPackage[i] ^ Masking_key[i % 4]); } return Encoding.UTF8.GetString(mDataPackage); } #endregion #region 发送数据 /// /// 把发送给客户端消息打包处理 /// /// The data. /// Message. private byte[] PackageServerData(string msg) { byte[] content = null; byte[] temp = Encoding.UTF8.GetBytes(msg); if (temp.Length < 126) { content = new byte[temp.Length + 2]; content[0] = 0x81; content[1] = (byte)temp.Length; Buffer.BlockCopy(temp, 0, content, 2, temp.Length); } else if (temp.Length < 0xFFFF) { content = new byte[temp.Length + 4]; content[0] = 0x81; content[1] = 126; content[2] = (byte)(temp.Length & 0xFF); content[3] = (byte)(temp.Length >> 8 & 0xFF); Buffer.BlockCopy(temp, 0, content, 4, temp.Length); } return content; } #endregion } }
启动WebSocket服务端：
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace SocketDemo { class Program { static void Main(string[] args) { WebSocket socket = new WebSocket(); socket.start(9191); } } }
客户端通过js连接，这也是为什么要封装成WebSocket的原因，因为客户也是使用js发起请求的：
"utf-8" />WebSocket客户端 WebSocket客户端示例
"message">请输入一些文字
"text" type="text">
这个功能的实现是参考一位大神的，但后来想找回那篇文章时找不到了。后续看到那篇文章再补回链接。
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