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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Collections.Specialized;
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using System.Net;
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using System.Net.Sockets;
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using System.Text;
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using UMC.Data;
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using UMC.Net;
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using UMC.Web;
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namespace UMC.Host
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{
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class HttpBridgeClient : NetBridge
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{
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static System.Threading.Timer _timer;
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static HttpBridgeClient()
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{
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_timer = new System.Threading.Timer(CheckTimeOut, null, 20000, 20000);
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}
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static void CheckTimeOut(Object state)
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{
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var cs = _bridgeClients.ToArray();
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foreach (var c in cs)
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{
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c?.Write(0, new byte[0], 0, 0);
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}
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}
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private static List<HttpBridgeClient> _bridgeClients = new List<HttpBridgeClient>();
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public static void Start(String key, String host, int port, int count)
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{
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if (_bridgeClients.Count > 0)
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{
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var vs = _bridgeClients.ToArray();
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foreach (var vi in vs)
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{
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vi._Stop();
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}
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_bridgeClients.Clear();
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}
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for (var i = 0; i < count; i++)
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{
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try
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{
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Connect(key, host, port, i, true);
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}
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catch
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{
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break;
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}
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}
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}
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String host, ip;
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int port, index;
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static void Connect(String host, String ip, int port, int index, bool start)
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{
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var client = new Socket(SocketType.Stream, ProtocolType.Tcp);
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client.Connect(ip, port);
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var bridge = new NetworkStream(client, true);
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var buffers = new byte[2000];
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var writer = new UMC.Net.TextWriter(bridge.Write, buffers);
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writer.Write($"GET / HTTP/1.1\r\n");
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writer.Write("Connection: upgrade\r\n");
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writer.Write("umc-request-protocol: bridge\r\n");
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writer.Write("Upgrade: websocket\r\n");
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if (index == 0 && start)
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{
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writer.Write($"umc-bridge-number: -1\r\n");
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}
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else
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{
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writer.Write($"umc-bridge-number: {index}\r\n");
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}
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writer.Write($"Host: {host}\r\n\r\n");
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writer.Flush();
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writer.Dispose();
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int i = bridge.Read(buffers);
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var end = UMC.Data.Utility.FindIndex(buffers, 0, i, HttpMimeBody.HeaderEnd);
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if (end > -1)
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{
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var headSize = end + 4;
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HttpStatusCode m_StatusCode;
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var header = new NameValueCollection();
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if (ResponseHeader(buffers, 0, headSize, header, out m_StatusCode))
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{
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if (m_StatusCode == HttpStatusCode.SwitchingProtocols)
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{
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var bridgeClient = new HttpBridgeClient();
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bridgeClient.host = host;
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bridgeClient.ip = ip;
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bridgeClient.index = index;
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bridgeClient.port = port;
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bridgeClient.Bridge(bridge, bridge);
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if (i > end + 4)
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{
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bridgeClient.Receive(buffers, headSize, i - headSize);
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}
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_bridgeClients.Add(bridgeClient);
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}
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}
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}
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}
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public static String ServerChange(int states)
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{
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var sb = new StringBuilder();
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switch (states % 3)
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{
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case 0:
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{
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var secret = WebResource.Instance().Provider["appSecret"];
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if (String.IsNullOrEmpty(secret))
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{
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sb.AppendLine("获取失败：\a应用未注册，请注册应用。");
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}
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else
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{
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var webr = new Uri(APIProxy.Uri, "Transfer").WebRequest();
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var ns = new System.Collections.Specialized.NameValueCollection();
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UMC.Proxy.Utility.Sign(webr, ns, secret);
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try
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{
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var meta = JSON.Deserialize<WebMeta>(webr.Get().ReadAsString());
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if (meta.ContainsKey("msg"))
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{
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sb.AppendLine($"获取失败：\a{meta["msg"]}。");
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}
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else
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{
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var scheme = meta["scheme"] ?? "http";
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if (IsRunning)
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{
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sb.AppendLine($"服务状态：\b已连接");
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}
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else
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{
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sb.AppendLine($"服务状态：未连接");
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}
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sb.AppendLine($"Web VPN ：{scheme}://{meta["domain"]}/");
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sb.AppendLine($"流量过期：{meta["expireTime"]}");
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sb.AppendLine($"剩余流量：{meta["allowSize"]}");
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sb.AppendLine($"上行流量：{meta["inputSize"]}");
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sb.AppendLine($"下行流量：{meta["outputSize"]}");
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sb.AppendLine();
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sb.AppendLine("\a特别注意：过期后剩余流量将会清零!!!");
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}
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}
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catch (Exception ex)
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{
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sb.AppendLine($"获取失败：\a{ex.Message}");
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}
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}
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}
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break;
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case 1:
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if (_bridgeClients.Count > 0)
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{
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sb.AppendLine("正在关停Web VPN服务。");
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Stop();
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}
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else
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{
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sb.AppendLine("Web VPN服务未开启。");
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}
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break;
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case 2:
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{
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var secret = WebResource.Instance().Provider["appSecret"];
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if (String.IsNullOrEmpty(secret))
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{
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sb.AppendLine($"Web VPN开启失败!!!");
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sb.AppendLine("失败原因：\a应用未注册，请注册应用。");
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}
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else if (_bridgeClients.Count > 0)
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{
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return ServerChange(0);
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}
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else
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{
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var webr = new Uri(APIProxy.Uri, "Transfer").WebRequest();
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var ns = new System.Collections.Specialized.NameValueCollection();
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UMC.Proxy.Utility.Sign(webr, ns, secret);
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try
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{
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var meta = JSON.Deserialize<WebMeta>(webr.Get().ReadAsString());
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var scheme = meta["scheme"] ?? "http";
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if (meta.ContainsKey("domain") == false)
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{
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sb.AppendLine($"Web VPN开启失败!!!");
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sb.AppendLine("失败原因：\a域名未注册，请注册域名。");
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}
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else if (meta.ContainsKey("msg"))
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{
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sb.AppendLine($"Web VPN开启失败!!!");
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sb.AppendLine($"失败原因：\a{meta["msg"]}。");
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}
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else
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{
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var ip = meta["ip"];
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var port = UMC.Data.Utility.IntParse(meta["port"], 0);
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try
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{
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Start(meta["domain"], ip, port, 4);
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var bridgeUrl = $"{scheme}://{meta["domain"]}";
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sb.AppendLine($"Web VPN ：\b{bridgeUrl}");
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sb.AppendLine($"服务状态：\a正连接");
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sb.AppendLine($"剩余流量：{meta["allowSize"]}");
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sb.AppendLine($"上行流量：{meta["inputSize"]}");
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sb.AppendLine($"下行流量：{meta["outputSize"]}");
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sb.AppendLine($"过期天数：{meta["expireTime"]}");
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sb.AppendLine();
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sb.AppendLine($"\a特别注意：过期后剩余流量将会清零!!!");
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var provider = Data.WebResource.Instance().Provider;
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if (String.Equals(provider.Attributes["bridge"], bridgeUrl) == false)
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{
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provider.Attributes["bridge"] = bridgeUrl;
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}
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provider.Attributes["webvpn"] = "true";
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var pc = Reflection.Configuration("assembly") ?? new ProviderConfiguration();
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pc.Add(provider);
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Reflection.Configuration("assembly", pc);
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}
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catch (Exception ex)
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{
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sb.AppendLine($"Web VPN开启失败!!!");
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sb.AppendLine($"失败原因：{ex.Message}");
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}
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}
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}
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catch (Exception ex)
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{
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sb.AppendLine($"Web VPN开启失败!!!");
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sb.AppendLine($"失败原因：\a{ex.Message}");
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}
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}
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}
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break;
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}
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return sb.ToString();
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}
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public static bool IsRunning => _bridgeClients.Count > 0;
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public static void Stop()
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{
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lock (_bridgeClients)
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{
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for (var i = 0; i < _bridgeClients.Count; i++)
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{
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try
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{
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_bridgeClients[i]?._Stop();
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}
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catch
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{
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}
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}
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_bridgeClients.Clear();
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}
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var provider = Data.WebResource.Instance().Provider;
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provider.Attributes.Remove("webvpn");
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var pc = Reflection.Configuration("assembly") ?? new ProviderConfiguration();
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pc.Add(provider);
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Reflection.Configuration("assembly", pc);
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}
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public override void Close()
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{
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base.Close();
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try
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{
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_bridgeClients.Remove(this);
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if (_stoped == false)
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{
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Connect(host, ip, port, this.index, false);
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}
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}
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catch
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{
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}
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}
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bool _stoped;
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void _Stop()
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{
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_stoped = true;
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base.Close();
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}
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HttpMimeBody Bridge(int pid)
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{
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return new HttpBridgeRequest(new HttpBridgeMime(pid, this));
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}
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public bool Remove(int pid)
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{
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HttpMimeBody httpMime;
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return this.Clients.TryRemove(pid, out httpMime);
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}
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ConcurrentDictionary<int, HttpMimeBody> Clients = new ConcurrentDictionary<int, HttpMimeBody>();
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protected override void Read(int pid, byte[] buffer, int index, int length)
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{
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if (length > 0)
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{
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HttpMimeBody proxy = this.Clients.GetOrAdd(pid, this.Bridge);
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try
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{
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proxy.Receive(buffer, index, length);
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}
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finally
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{
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if (proxy.IsHttpFormatError)
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{
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this.Clients.TryRemove(pid, out proxy);
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this.Write(pid, Array.Empty<byte>(), 0, 0);
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}
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else if (proxy.IsWebSocket == false && proxy.IsMimeFinish)
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{
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this.Clients.TryRemove(pid, out proxy);
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}
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}
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}
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else
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{
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HttpMimeBody mimeBody;
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if (this.Clients.TryRemove(pid, out mimeBody))
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{
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mimeBody.ReceiveException(new Exception("穿透传输中止"));
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}
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}
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}
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}
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}
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