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- using Shadowsocks.Model;
- using Shadowsocks.Properties;
- using Shadowsocks.Util;
- using System;
- using System.Collections.Generic;
- using System.Diagnostics;
- using System.IO;
- using System.IO.Compression;
- using System.Net;
- using System.Net.Sockets;
- using System.Text;
-
- namespace Shadowsocks.Controller
- {
- class PACServer : Listener.Service
- {
- public static string PAC_FILE = "pac.txt";
-
- public static string USER_RULE_FILE = "user-rule.txt";
-
- FileSystemWatcher watcher;
- private Configuration _config;
-
- public event EventHandler PACFileChanged;
-
- public PACServer()
- {
- this.WatchPacFile();
- }
-
- public void UpdateConfiguration(Configuration config)
- {
- this._config = config;
- }
-
- public bool Handle(byte[] firstPacket, int length, Socket socket, object state)
- {
- if (socket.ProtocolType != ProtocolType.Tcp)
- {
- return false;
- }
- try
- {
- string request = Encoding.UTF8.GetString(firstPacket, 0, length);
- string[] lines = request.Split('\r', '\n');
- bool hostMatch = false, pathMatch = false, useSocks = false;
- foreach (string line in lines)
- {
- string[] kv = line.Split(new char[]{':'}, 2);
- if (kv.Length == 2)
- {
- if (kv[0] == "Host")
- {
- if (kv[1].Trim() == ((IPEndPoint)socket.LocalEndPoint).ToString())
- {
- hostMatch = true;
- }
- }
- else if (kv[0] == "User-Agent")
- {
- // we need to drop connections when changing servers
- /* if (kv[1].IndexOf("Chrome") >= 0)
- {
- useSocks = true;
- } */
- }
- }
- else if (kv.Length == 1)
- {
- if (line.IndexOf("pac") >= 0)
- {
- pathMatch = true;
- }
- }
- }
- if (hostMatch && pathMatch)
- {
- SendResponse(firstPacket, length, socket, useSocks);
- return true;
- }
- return false;
- }
- catch (ArgumentException)
- {
- return false;
- }
- }
-
-
- public string TouchPACFile()
- {
- if (File.Exists(PAC_FILE))
- {
- return PAC_FILE;
- }
- else
- {
- FileManager.UncompressFile(PAC_FILE, Resources.proxy_pac_txt);
- return PAC_FILE;
- }
- }
-
- internal string TouchUserRuleFile()
- {
- if (File.Exists(USER_RULE_FILE))
- {
- return USER_RULE_FILE;
- }
- else
- {
- File.WriteAllText(USER_RULE_FILE, Resources.user_rule);
- return USER_RULE_FILE;
- }
- }
-
- private string GetPACContent()
- {
- if (File.Exists(PAC_FILE))
- {
- return File.ReadAllText(PAC_FILE, Encoding.UTF8);
- }
- else
- {
- return Utils.UnGzip(Resources.proxy_pac_txt);
- }
- }
-
- public void SendResponse(byte[] firstPacket, int length, Socket socket, bool useSocks)
- {
- try
- {
- string pac = GetPACContent();
-
- IPEndPoint localEndPoint = (IPEndPoint)socket.LocalEndPoint;
-
- string proxy = GetPACAddress(firstPacket, length, localEndPoint, useSocks);
-
- pac = pac.Replace("__PROXY__", proxy);
-
- string text = String.Format(@"HTTP/1.1 200 OK
- Server: Shadowsocks
- Content-Type: application/x-ns-proxy-autoconfig
- Content-Length: {0}
- Connection: Close
-
- ", System.Text.Encoding.UTF8.GetBytes(pac).Length) + pac;
- byte[] response = System.Text.Encoding.UTF8.GetBytes(text);
- socket.BeginSend(response, 0, response.Length, 0, new AsyncCallback(SendCallback), socket);
- Util.Utils.ReleaseMemory();
- }
- catch (Exception e)
- {
- Console.WriteLine(e);
- socket.Close();
- }
- }
-
- private void SendCallback(IAsyncResult ar)
- {
- Socket conn = (Socket)ar.AsyncState;
- try
- {
- conn.Shutdown(SocketShutdown.Send);
- }
- catch
- { }
- }
-
- private void WatchPacFile()
- {
- if (watcher != null)
- {
- watcher.Dispose();
- }
- watcher = new FileSystemWatcher(Directory.GetCurrentDirectory());
- watcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName;
- watcher.Filter = PAC_FILE;
- watcher.Changed += Watcher_Changed;
- watcher.Created += Watcher_Changed;
- watcher.Deleted += Watcher_Changed;
- watcher.Renamed += Watcher_Changed;
- watcher.EnableRaisingEvents = true;
- }
-
- private void Watcher_Changed(object sender, FileSystemEventArgs e)
- {
- if (PACFileChanged != null)
- {
- PACFileChanged(this, new EventArgs());
- }
- }
-
- private string GetPACAddress(byte[] requestBuf, int length, IPEndPoint localEndPoint, bool useSocks)
- {
- //try
- //{
- // string requestString = Encoding.UTF8.GetString(requestBuf);
- // if (requestString.IndexOf("AppleWebKit") >= 0)
- // {
- // string address = "" + localEndPoint.Address + ":" + config.GetCurrentServer().local_port;
- // proxy = "SOCKS5 " + address + "; SOCKS " + address + ";";
- // }
- //}
- //catch (Exception e)
- //{
- // Console.WriteLine(e);
- //}
- return (useSocks ? "SOCKS5 " : "PROXY ") + localEndPoint.Address + ":" + this._config.localPort + ";";
- }
- }
- }
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