Merge pull request #1 from shadowsocks/master

Master

CHANGES

@@ -1,3 +1,32 @@
+2.5.6 2015-08-19
+- Add portable mode. Create shadowsocks_portable_mode.txt to use it
+- Support server reorder
+
+2.5.5 2015-08-17
+- Fix crash when enabling Availability Statistics and some servers can not be resolved
+- Allow multiple instances
+- Other fixes
+
+2.5.4 2015-08-16
+- Hide Privoxy icon
+
+2.5.3 2015-08-16
+- Replace Polipo with Privoxy
+- Add Choose by Total Packet Loss
+
+2.5.2 2015-08-04
+- Add log viewer
+
+2.5.1 2015-07-26
+- Prevent HA from switching servers too frequently
+- Fix server settings can not be updated when using HA
+- Fix server port can't be 8123
+- Other minor fixes
+
+2.5 2015-07-25
+- Support load balance
+- Support high availability
+
 2.4 2015-07-11
 - Support UDP relay
 - Support online PAC

LICENSE.txt

@@ -20,30 +20,348 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 3rd party projects
 ==================
 
-polipo
+Privoxy
 ------------------
 
-https://github.com/jech/polipo
-
-Copyright (c) 2003-2008 by Juliusz Chroboczek
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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+POSSIBILITY OF SUCH DAMAGES.
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+free software which everyone can redistribute and change under these terms.
+
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+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
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+    Copyright (C) <year>  <name of author>
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+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
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+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
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+parts of the General Public License.  Of course, the commands you use may
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+mouse-clicks or menu items--whatever suits your program.
+
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+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
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+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
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+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
 
 
 PolarSSL
@@ -98,7 +416,6 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 
-
 libsodium
 ---------
 

README.md

@@ -3,43 +3,72 @@ Shadowsocks for Windows
 
 [![Build Status]][Appveyor]
 
+[中文说明]
+
 #### Features
 
 1. System proxy configuration
-2. Fast profile switching
-3. PAC mode and global mode
-4. GFWList and user rules
-5. Supports HTTP proxy
+2. PAC mode and global mode
+3. [GFWList] and user rules
+4. Supports HTTP proxy
+5. Supports server auto switching
 6. Supports UDP relay (see Usage)
 
 #### Download
 
-Download a [latest release].
-
-For >= Windows 8 or with .Net 4.0, download Shadowsocks-win-dotnet4.0-x.x.x.zip.
+Download the [latest release].
 
-For <= Windows 7 or with .Net 2.0, download Shadowsocks-win-x.x.x.zip.
-
-#### Usage
+#### Basic
 
 1. Find Shadowsocks icon in the notification tray
 2. You can add multiple servers in servers menu
-3. Select Enable System Proxy menu to enable system proxy. Please disable other
+3. Select `Enable System Proxy` menu to enable system proxy. Please disable other
 proxy addons in your browser, or set them to use system proxy
 4. You can also configure your browser proxy manually if you don't want to enable
 system proxy. Set Socks5 or HTTP proxy to 127.0.0.1:1080. You can change this
-port in Server -> Edit Servers
-5. You can change PAC rules by editing the PAC file. When you save the PAC file
+port in `Servers -> Edit Servers`
+
+#### PAC
+
+1. You can change PAC rules by editing the PAC file. When you save the PAC file
 with any editor, Shadowsocks will notify browsers about the change automatically
-6. You can also update the PAC file from GFWList. Note your modifications to the PAC
-file will be lost. However you can put your rules in the user rule file for GFWList.
-Don't forget to update from GFWList again after you've edited the user rule
-7. For UDP, you need to use SocksCap or ProxyCap to force programs you want
-to proxy to tunnel over Shadowsocks
+2. You can also update PAC file from [GFWList] (maintained by 3rd party)
+3. You can also use online PAC URL
+
+#### Server Auto Switching
+
+1. Load balance: choosing server randomly
+2. High availability: choosing the best server (low latency and packet loss)
+3. Choose By Total Package Loss: ping and choose. Please also enable
+   `Availability Statistics` in the menu if you want to use this
+4. Write your own strategy by implement IStrategy interface and send us a pull request!
+
+#### UDP
+
+For UDP, you need to use SocksCap or ProxyCap to force programs you want
+to be proxied to tunnel over Shadowsocks
+
+#### Multiple Instances
+
+If you want to manage multiple servers using other tools like SwitchyOmega,
+you can start multiple Shadowsocks instances. To avoid configuration conflicts,
+copy Shadowsocks to a new directory and choose a different local port.
+
+Also, make sure to use `SOCKS5` proxy in SwitchyOmega, since we have only
+one HTTP proxy instance.
+
+#### Server Configuration
+
+Please visit [Servers] for more information.
+
+#### Portable Mode
+
+If you want to put all temporary files into shadowsocks/temp folder instead of
+system temp folder, create a `shadowsocks_portable_mode.txt` into shadowsocks folder.
 
-### Develop
+#### Develop
 
-Visual Studio Express 2012 is recommended.
+Visual Studio 2015 is required.
 
 #### License
 
@@ -49,3 +78,6 @@ GPLv3
 [Appveyor]:       https://ci.appveyor.com/project/clowwindy/shadowsocks-csharp
 [Build Status]:   https://ci.appveyor.com/api/projects/status/gknc8l1lxy423ehv/branch/master
 [latest release]: https://github.com/shadowsocks/shadowsocks-csharp/releases
+[GFWList]:        https://github.com/gfwlist/gfwlist
+[Servers]:        https://github.com/shadowsocks/shadowsocks/wiki/Ports-and-Clients#linux--server-side
+[中文说明]:       https://github.com/shadowsocks/shadowsocks-windows/wiki/Shadowsocks-Windows-%E4%BD%BF%E7%94%A8%E8%AF%B4%E6%98%8E

shadowsocks-csharp/Controller/I18N.cs

@@ -12,7 +12,7 @@ namespace Shadowsocks.Controller
         static I18N()
         {
             Strings = new Dictionary<string, string>();
-            
+
             if (System.Globalization.CultureInfo.CurrentCulture.IetfLanguageTag.ToLowerInvariant().StartsWith("zh"))
             {
                 string[] lines = Regex.Split(Resources.cn, "\r\n|\r|\n");

shadowsocks-csharp/Controller/Logging.cs

@@ -1,4 +1,5 @@
-using System;
+using Shadowsocks.Util;
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Net.Sockets;
@@ -14,14 +15,14 @@ namespace Shadowsocks.Controller
         {
             try
             {
-                string temppath = Path.GetTempPath();
+                string temppath = Utils.GetTempPath();
                 LogFile = Path.Combine(temppath, "shadowsocks.log");
                 FileStream fs = new FileStream(LogFile, FileMode.Append);
                 StreamWriterWithTimestamp sw = new StreamWriterWithTimestamp(fs);
                 sw.AutoFlush = true;
                 Console.SetOut(sw);
                 Console.SetError(sw);
-                
+
                 return true;
             }
             catch (IOException e)
@@ -31,6 +32,14 @@ namespace Shadowsocks.Controller
             }
         }
 
+        public static void Debug(object o)
+        {
+
+#if DEBUG
+            Console.WriteLine(o);
+#endif
+        }
+
         public static void LogUsefulException(Exception e)
         {
             // just log useful exceptions, not all of them
@@ -55,12 +64,14 @@ namespace Shadowsocks.Controller
                     Console.WriteLine(e);
                 }
             }
+            else if (e is ObjectDisposedException)
+            {
+            }
             else
             {
                 Console.WriteLine(e);
             }
         }
-
     }
 
     // Simply extended System.IO.StreamWriter for adding timestamp workaround

shadowsocks-csharp/Controller/Service/AvailabilityStatistics.cs

@@ -0,0 +1,117 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net.NetworkInformation;
+using System.Threading;
+using Shadowsocks.Model;
+using System.Reflection;
+using Shadowsocks.Util;
+
+namespace Shadowsocks.Controller
+{
+    class AvailabilityStatistics
+    {
+        private static readonly string StatisticsFilesName = "shadowsocks.availability.csv";
+        private static readonly string Delimiter = ",";
+        private static readonly int Timeout = 500;
+        private static readonly int Repeat = 4; //repeat times every evaluation
+        private static readonly int Interval = 10 * 60 * 1000;  //evaluate proxies every 15 minutes
+        private Timer timer = null;
+        private State state = null;
+        private List<Server> servers;
+
+        public static string AvailabilityStatisticsFile;
+
+        //static constructor to initialize every public static fields before refereced
+        static AvailabilityStatistics()
+        {
+            string temppath = Utils.GetTempPath();
+            AvailabilityStatisticsFile = Path.Combine(temppath, StatisticsFilesName);
+        }
+
+        public bool Set(bool enabled)
+        {
+            try
+            {
+                if (enabled)
+                {
+                    if (timer?.Change(0, Interval) == null)
+                    {
+                        state = new State();
+                        timer = new Timer(Evaluate, state, 0, Interval);
+                    }
+                }
+                else
+                {
+                    timer?.Dispose();
+                }
+                return true;
+            }
+            catch (Exception e)
+            {
+                Logging.LogUsefulException(e);
+                return false;
+            }
+        }
+
+        private void Evaluate(object obj)
+        {
+            Ping ping = new Ping();
+            State state = (State) obj;
+            foreach (var server in servers)
+            {
+                Logging.Debug("eveluating " + server.FriendlyName());
+                foreach (var _ in Enumerable.Range(0, Repeat))
+                {
+                    //TODO: do simple analyze of data to provide friendly message, like package loss.
+                    string timestamp = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
+                    //ICMP echo. we can also set options and special bytes
+                    //seems no need to use SendPingAsync
+                    try
+                    {
+                        PingReply reply = ping.Send(server.server, Timeout);
+                        state.data = new List<KeyValuePair<string, string>>();
+                        state.data.Add(new KeyValuePair<string, string>("Timestamp", timestamp));
+                        state.data.Add(new KeyValuePair<string, string>("Server", server.FriendlyName()));
+                        state.data.Add(new KeyValuePair<string, string>("Status", reply.Status.ToString()));
+                        state.data.Add(new KeyValuePair<string, string>("RoundtripTime", reply.RoundtripTime.ToString()));
+                        //state.data.Add(new KeyValuePair<string, string>("data", reply.Buffer.ToString())); // The data of reply
+                        Append(state.data);
+                    }
+                    catch (Exception e)
+                    {
+                        Logging.LogUsefulException(e);
+                    }
+                }
+            }
+        }
+
+        private static void Append(List<KeyValuePair<string, string>> data)
+        {
+            string dataLine = string.Join(Delimiter, data.Select(kv => kv.Value).ToArray());
+            string[] lines;
+            if (!File.Exists(AvailabilityStatisticsFile))
+            {
+                string headerLine = string.Join(Delimiter, data.Select(kv => kv.Key).ToArray());
+                lines = new string[] { headerLine, dataLine };
+            }
+            else
+            {
+                lines = new string[] { dataLine };
+            }
+            File.AppendAllLines(AvailabilityStatisticsFile, lines);
+        }
+
+        internal void UpdateConfiguration(Configuration _config)
+        {
+            Set(_config.availabilityStatistics);
+            servers = _config.configs;
+        }
+
+        private class State
+        {
+            public List<KeyValuePair<string, string>> data = new List<KeyValuePair<string, string>>();
+        }
+    }
+}

shadowsocks-csharp/Controller/Listener.cs → shadowsocks-csharp/Controller/Service/Listener.cs

@@ -18,7 +18,7 @@ namespace Shadowsocks.Controller
         public class UDPState
         {
             public byte[] buffer = new byte[4096];
-            public EndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, 1);
+            public EndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, 0);
         }
 
         Configuration _config;
@@ -77,7 +77,6 @@ namespace Shadowsocks.Controller
                 _udpSocket.Bind(localEndPoint);
                 _tcpSocket.Listen(1024);
 
-
                 // Start an asynchronous socket to listen for connections.
                 Console.WriteLine("Shadowsocks started");
                 _tcpSocket.BeginAccept(
@@ -185,7 +184,6 @@ namespace Shadowsocks.Controller
             }
         }
 
-
         private void ReceiveCallback(IAsyncResult ar)
         {
             object[] state = (object[])ar.AsyncState;

shadowsocks-csharp/Controller/PACServer.cs → shadowsocks-csharp/Controller/Service/PACServer.cs

@@ -86,7 +86,6 @@ namespace Shadowsocks.Controller
             }
         }
 
-
         public string TouchPACFile()
         {
             if (File.Exists(PAC_FILE))
@@ -146,7 +145,7 @@ 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();
+                Util.Utils.ReleaseMemory(true);
             }
             catch (Exception e)
             {

shadowsocks-csharp/Controller/PolipoRunner.cs → shadowsocks-csharp/Controller/Service/PolipoRunner.cs

@@ -8,6 +8,8 @@ using System.IO.Compression;
 using System.Text;
 using System.Net.NetworkInformation;
 using System.Net;
+using System.Runtime.InteropServices;
+using Shadowsocks.Util;
 
 namespace Shadowsocks.Controller
 {
@@ -19,10 +21,11 @@ namespace Shadowsocks.Controller
 
         static PolipoRunner()
         {
-            temppath = Path.GetTempPath();
+            temppath = Utils.GetTempPath();
             try
             {
-                FileManager.UncompressFile(temppath + "/ss_polipo.exe", Resources.polipo_exe);
+                FileManager.UncompressFile(temppath + "/ss_privoxy.exe", Resources.privoxy_exe);
+                FileManager.UncompressFile(temppath + "/mgwz.dll", Resources.mgwz_dll);
             }
             catch (IOException e)
             {
@@ -43,7 +46,7 @@ namespace Shadowsocks.Controller
             Server server = configuration.GetCurrentServer();
             if (_process == null)
             {
-                Process[] existingPolipo = Process.GetProcessesByName("ss_polipo");
+                Process[] existingPolipo = Process.GetProcessesByName("ss_privoxy");
                 foreach (Process p in existingPolipo)
                 {
                     try
@@ -56,17 +59,20 @@ namespace Shadowsocks.Controller
                         Console.WriteLine(e.ToString());
                     }
                 }
-                string polipoConfig = Resources.polipo_config;
+                string polipoConfig = Resources.privoxy_conf;
                 _runningPort = this.GetFreePort();
                 polipoConfig = polipoConfig.Replace("__SOCKS_PORT__", configuration.localPort.ToString());
                 polipoConfig = polipoConfig.Replace("__POLIPO_BIND_PORT__", _runningPort.ToString());
                 polipoConfig = polipoConfig.Replace("__POLIPO_BIND_IP__", configuration.shareOverLan ? "0.0.0.0" : "127.0.0.1");
-                FileManager.ByteArrayToFile(temppath + "/polipo.conf", System.Text.Encoding.UTF8.GetBytes(polipoConfig));
+                FileManager.ByteArrayToFile(temppath + "/privoxy.conf", System.Text.Encoding.UTF8.GetBytes(polipoConfig));
 
+                if (!(temppath.EndsWith("\\") || temppath.EndsWith("/"))) {
+                    temppath = temppath + "\\";
+                }
                 _process = new Process();
                 // Configure the process using the StartInfo properties.
-                _process.StartInfo.FileName = temppath + "/ss_polipo.exe";
-                _process.StartInfo.Arguments = "-c \"" + temppath + "/polipo.conf\"";
+                _process.StartInfo.FileName = temppath + "ss_privoxy.exe";
+                _process.StartInfo.Arguments = " \"" + temppath + "privoxy.conf\"";
                 _process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
                 _process.StartInfo.UseShellExecute = true;
                 _process.StartInfo.CreateNoWindow = true;
@@ -74,6 +80,7 @@ namespace Shadowsocks.Controller
                 //_process.StartInfo.RedirectStandardError = true;
                 _process.Start();
             }
+            RefreshTrayArea();
         }
 
         public void Stop()
@@ -91,6 +98,7 @@ namespace Shadowsocks.Controller
                 }
                 _process = null;
             }
+            RefreshTrayArea();
         }
 
         private int GetFreePort()
@@ -122,5 +130,48 @@ namespace Shadowsocks.Controller
             }
             throw new Exception("No free port found.");
         }
+
+        [StructLayout(LayoutKind.Sequential)]
+        public struct RECT
+        {
+            public int left;
+            public int top;
+            public int right;
+            public int bottom;
+        }
+        [DllImport("user32.dll")]
+        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
+        [DllImport("user32.dll")]
+        public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
+        [DllImport("user32.dll")]
+        public static extern bool GetClientRect(IntPtr hWnd, out RECT lpRect);
+        [DllImport("user32.dll")]
+        public static extern IntPtr SendMessage(IntPtr hWnd, uint msg, int wParam, int lParam);
+
+        public void RefreshTrayArea()
+        {
+            IntPtr systemTrayContainerHandle = FindWindow("Shell_TrayWnd", null);
+            IntPtr systemTrayHandle = FindWindowEx(systemTrayContainerHandle, IntPtr.Zero, "TrayNotifyWnd", null);
+            IntPtr sysPagerHandle = FindWindowEx(systemTrayHandle, IntPtr.Zero, "SysPager", null);
+            IntPtr notificationAreaHandle = FindWindowEx(sysPagerHandle, IntPtr.Zero, "ToolbarWindow32", "Notification Area");
+            if (notificationAreaHandle == IntPtr.Zero)
+            {
+                notificationAreaHandle = FindWindowEx(sysPagerHandle, IntPtr.Zero, "ToolbarWindow32", "User Promoted Notification Area");
+                IntPtr notifyIconOverflowWindowHandle = FindWindow("NotifyIconOverflowWindow", null);
+                IntPtr overflowNotificationAreaHandle = FindWindowEx(notifyIconOverflowWindowHandle, IntPtr.Zero, "ToolbarWindow32", "Overflow Notification Area");
+                RefreshTrayArea(overflowNotificationAreaHandle);
+            }
+            RefreshTrayArea(notificationAreaHandle);
+        }
+
+        private static void RefreshTrayArea(IntPtr windowHandle)
+        {
+            const uint wmMousemove = 0x0200;
+            RECT rect;
+            GetClientRect(windowHandle, out rect);
+            for (var x = 0; x < rect.right; x += 5)
+                for (var y = 0; y < rect.bottom; y += 5)
+                    SendMessage(windowHandle, wmMousemove, 0, (y << 16) + x);
+        }
     }
 }

shadowsocks-csharp/Controller/PortForwarder.cs → shadowsocks-csharp/Controller/Service/PortForwarder.cs

@@ -103,7 +103,6 @@ namespace Shadowsocks.Controller
                 }
             }
 
-
             private void StartPipe(IAsyncResult ar)
             {
                 if (_closed)

shadowsocks-csharp/Controller/TCPRelay.cs → shadowsocks-csharp/Controller/Service/TCPRelay.cs

@@ -5,16 +5,27 @@ using System.Net.Sockets;
 using System.Net;
 using Shadowsocks.Encryption;
 using Shadowsocks.Model;
+using Shadowsocks.Controller.Strategy;
+using System.Timers;
 
 namespace Shadowsocks.Controller
 {
 
     class TCPRelay : Listener.Service
     {
-        private Configuration _config;
-        public TCPRelay(Configuration config)
+        private ShadowsocksController _controller;
+        private DateTime _lastSweepTime;
+
+        public ISet<Handler> Handlers
+        {
+            get; set;
+        }
+
+        public TCPRelay(ShadowsocksController controller)
         {
-            this._config = config;
+            this._controller = controller;
+            this.Handlers = new HashSet<Handler>();
+            this._lastSweepTime = DateTime.Now;
         }
 
         public bool Handle(byte[] firstPacket, int length, Socket socket, object state)
@@ -30,12 +41,34 @@ namespace Shadowsocks.Controller
             socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay, true);
             Handler handler = new Handler();
             handler.connection = socket;
-            Server server = _config.GetCurrentServer();
-            handler.encryptor = EncryptorFactory.GetEncryptor(server.method, server.password);
-            handler.server = server;
+            handler.controller = _controller;
+            handler.relay = this;
 
             handler.Start(firstPacket, length);
-            return true;
+            IList<Handler> handlersToClose = new List<Handler>();
+            lock (this.Handlers)
+            {
+                this.Handlers.Add(handler);
+                Logging.Debug($"connections: {Handlers.Count}");
+                DateTime now = DateTime.Now;
+                if (now - _lastSweepTime > TimeSpan.FromSeconds(1))
+                {
+                    _lastSweepTime = now;
+                    foreach (Handler handler1 in this.Handlers)
+                    {
+                        if (now - handler1.lastActivity > TimeSpan.FromSeconds(900))
+                        {
+                            handlersToClose.Add(handler1);
+                        }
+                    }
+                }
+            }
+            foreach (Handler handler1 in handlersToClose)
+            {
+                Logging.Debug("Closing timed out connection");
+                handler1.Close();
+            }
+        return true;
         }
     }
 
@@ -47,13 +80,24 @@ namespace Shadowsocks.Controller
         // Client  socket.
         public Socket remote;
         public Socket connection;
+        public ShadowsocksController controller;
+        public TCPRelay relay;
+
+        public DateTime lastActivity;
+
+        private int retryCount = 0;
+        private bool connected;
 
         private byte command;
         private byte[] _firstPacket;
         private int _firstPacketLength;
         // Size of receive buffer.
-        public const int RecvSize = 16384;
+        public const int RecvSize = 8192;
         public const int BufferSize = RecvSize + 32;
+
+        private int totalRead = 0;
+        private int totalWrite = 0;
+
         // remote receive buffer
         private byte[] remoteRecvBuffer = new byte[RecvSize];
         // remote send buffer
@@ -67,15 +111,29 @@ namespace Shadowsocks.Controller
         private bool connectionShutdown = false;
         private bool remoteShutdown = false;
         private bool closed = false;
-        
+
         private object encryptionLock = new object();
         private object decryptionLock = new object();
 
+        private DateTime _startConnectTime;
+
+        public void CreateRemote()
+        {
+            Server server = controller.GetAServer(IStrategyCallerType.TCP, (IPEndPoint)connection.RemoteEndPoint);
+            if (server == null || server.server == "")
+            {
+                throw new ArgumentException("No server configured");
+            }
+            this.encryptor = EncryptorFactory.GetEncryptor(server.method, server.password);
+            this.server = server;
+        }
+
         public void Start(byte[] firstPacket, int length)
         {
             this._firstPacket = firstPacket;
             this._firstPacketLength = length;
             this.HandshakeReceive();
+            this.lastActivity = DateTime.Now;
         }
 
         private void CheckClose()
@@ -88,6 +146,11 @@ namespace Shadowsocks.Controller
 
         public void Close()
         {
+            lock (relay.Handlers)
+            {
+                Logging.Debug($"connections: {relay.Handlers.Count}");
+                relay.Handlers.Remove(this);
+            }
             lock (this)
             {
                 if (closed)
@@ -115,7 +178,7 @@ namespace Shadowsocks.Controller
                     remote.Shutdown(SocketShutdown.Both);
                     remote.Close();
                 }
-                catch (SocketException e)
+                catch (Exception e)
                 {
                     Logging.LogUsefulException(e);
                 }
@@ -124,12 +187,14 @@ namespace Shadowsocks.Controller
             {
                 lock (decryptionLock)
                 {
-                    ((IDisposable)encryptor).Dispose();
+                    if (encryptor != null)
+                    {
+                        ((IDisposable)encryptor).Dispose();
+                    }
                 }
             }
         }
 
-
         private void HandshakeReceive()
         {
             if (closed)
@@ -199,14 +264,14 @@ namespace Shadowsocks.Controller
             try
             {
                 int bytesRead = connection.EndReceive(ar);
-                
+
                 if (bytesRead >= 3)
                 {
                     command = connetionRecvBuffer[1];
                     if (command == 1)
                     {
                         byte[] response = { 5, 0, 0, 1, 0, 0, 0, 0, 0, 0 };
-                        connection.BeginSend(response, 0, response.Length, 0, new AsyncCallback(StartConnect), null);
+                        connection.BeginSend(response, 0, response.Length, 0, new AsyncCallback(ResponseCallback), null);
                     }
                     else if (command == 3)
                     {
@@ -249,7 +314,6 @@ namespace Shadowsocks.Controller
 
         private void ReadAll(IAsyncResult ar)
         {
-
             if (closed)
             {
                 return;
@@ -283,12 +347,37 @@ namespace Shadowsocks.Controller
             }
         }
 
-        private void StartConnect(IAsyncResult ar)
+        private void ResponseCallback(IAsyncResult ar)
         {
             try
             {
                 connection.EndSend(ar);
 
+                StartConnect();
+            }
+
+            catch (Exception e)
+            {
+                Logging.LogUsefulException(e);
+                this.Close();
+            }
+        }
+
+        private class ServerTimer : Timer
+        {
+            public Server Server;
+
+            public ServerTimer(int p) :base(p)
+            {
+            }
+        }
+
+        private void StartConnect()
+        {
+            try
+            {
+                CreateRemote();
+
                 // TODO async resolving
                 IPAddress ipAddress;
                 bool parsed = IPAddress.TryParse(server.server, out ipAddress);
@@ -299,14 +388,21 @@ namespace Shadowsocks.Controller
                 }
                 IPEndPoint remoteEP = new IPEndPoint(ipAddress, server.server_port);
 
-
                 remote = new Socket(ipAddress.AddressFamily,
                     SocketType.Stream, ProtocolType.Tcp);
                 remote.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay, true);
 
+                _startConnectTime = DateTime.Now;
+                ServerTimer connectTimer = new ServerTimer(3000);
+                connectTimer.AutoReset = false;
+                connectTimer.Elapsed += connectTimer_Elapsed;
+                connectTimer.Enabled = true;
+                connectTimer.Server = server;
+
+                connected = false;
                 // Connect to the remote endpoint.
                 remote.BeginConnect(remoteEP,
-                    new AsyncCallback(ConnectCallback), null);
+                    new AsyncCallback(ConnectCallback), connectTimer);
             }
             catch (Exception e)
             {
@@ -315,26 +411,84 @@ namespace Shadowsocks.Controller
             }
         }
 
+        private void connectTimer_Elapsed(object sender, ElapsedEventArgs e)
+        {
+            if (connected)
+            {
+                return;
+            }
+            Server server = ((ServerTimer)sender).Server;
+            IStrategy strategy = controller.GetCurrentStrategy();
+            if (strategy != null)
+            {
+                strategy.SetFailure(server);
+            }
+            Console.WriteLine(String.Format("{0} timed out", server.FriendlyName()));
+            remote.Close();
+            RetryConnect();
+        }
+
+        private void RetryConnect()
+        {
+            if (retryCount < 4)
+            {
+                Logging.Debug("Connection failed, retrying");
+                StartConnect();
+                retryCount++;
+            }
+            else
+            {
+                this.Close();
+            }
+        }
+
         private void ConnectCallback(IAsyncResult ar)
         {
+            Server server = null;
             if (closed)
             {
                 return;
             }
             try
             {
+                ServerTimer timer = (ServerTimer)ar.AsyncState;
+                server = timer.Server;
+                timer.Elapsed -= connectTimer_Elapsed;
+                timer.Enabled = false;
+                timer.Dispose();
+
                 // Complete the connection.
                 remote.EndConnect(ar);
 
+                connected = true;
+
                 //Console.WriteLine("Socket connected to {0}",
                 //    remote.RemoteEndPoint.ToString());
 
+                var latency = DateTime.Now - _startConnectTime;
+                IStrategy strategy = controller.GetCurrentStrategy();
+                if (strategy != null)
+                {
+                    strategy.UpdateLatency(server, latency);
+                }
+
                 StartPipe();
             }
+            catch (ArgumentException)
+            {
+            }
             catch (Exception e)
             {
+                if (server != null)
+                {
+                    IStrategy strategy = controller.GetCurrentStrategy();
+                    if (strategy != null)
+                    {
+                        strategy.SetFailure(server);
+                    }
+                }
                 Logging.LogUsefulException(e);
-                this.Close();
+                RetryConnect();
             }
         }
 
@@ -367,9 +521,11 @@ namespace Shadowsocks.Controller
             try
             {
                 int bytesRead = remote.EndReceive(ar);
+                totalRead += bytesRead;
 
                 if (bytesRead > 0)
                 {
+                    this.lastActivity = DateTime.Now;
                     int bytesToSend;
                     lock (decryptionLock)
                     {
@@ -380,6 +536,12 @@ namespace Shadowsocks.Controller
                         encryptor.Decrypt(remoteRecvBuffer, bytesRead, remoteSendBuffer, out bytesToSend);
                     }
                     connection.BeginSend(remoteSendBuffer, 0, bytesToSend, 0, new AsyncCallback(PipeConnectionSendCallback), null);
+
+                    IStrategy strategy = controller.GetCurrentStrategy();
+                    if (strategy != null)
+                    {
+                        strategy.UpdateLastRead(this.server);
+                    }
                 }
                 else
                 {
@@ -387,6 +549,13 @@ namespace Shadowsocks.Controller
                     connection.Shutdown(SocketShutdown.Send);
                     connectionShutdown = true;
                     CheckClose();
+
+                    if (totalRead == 0)
+                    {
+                        // closed before anything received, reports as failure
+                        // disable this feature
+                        // controller.GetCurrentStrategy().SetFailure(this.server);
+                    }
                 }
             }
             catch (Exception e)
@@ -405,6 +574,7 @@ namespace Shadowsocks.Controller
             try
             {
                 int bytesRead = connection.EndReceive(ar);
+                totalWrite += bytesRead;
 
                 if (bytesRead > 0)
                 {
@@ -418,6 +588,12 @@ namespace Shadowsocks.Controller
                         encryptor.Encrypt(connetionRecvBuffer, bytesRead, connetionSendBuffer, out bytesToSend);
                     }
                     remote.BeginSend(connetionSendBuffer, 0, bytesToSend, 0, new AsyncCallback(PipeRemoteSendCallback), null);
+
+                    IStrategy strategy = controller.GetCurrentStrategy();
+                    if (strategy != null)
+                    {
+                        strategy.UpdateLastWrite(this.server);
+                    }
                 }
                 else
                 {
@@ -471,5 +647,4 @@ namespace Shadowsocks.Controller
             }
         }
     }
-
 }

shadowsocks-csharp/Controller/UDPRelay.cs → shadowsocks-csharp/Controller/Service/UDPRelay.cs

@@ -6,16 +6,17 @@ using Shadowsocks.Model;
 using System.Net.Sockets;
 using System.Net;
 using System.Runtime.CompilerServices;
+using Shadowsocks.Controller.Strategy;
 
 namespace Shadowsocks.Controller
 {
     class UDPRelay : Listener.Service
     {
-        private Configuration _config;
+        private ShadowsocksController _controller;
         private LRUCache<IPEndPoint, UDPHandler> _cache;
-        public UDPRelay(Configuration config)
+        public UDPRelay(ShadowsocksController controller)
         {
-            this._config = config;
+            this._controller = controller;
             this._cache = new LRUCache<IPEndPoint, UDPHandler>(512);  // todo: choose a smart number
         }
 
@@ -34,7 +35,7 @@ namespace Shadowsocks.Controller
             UDPHandler handler = _cache.get(remoteEndPoint);
             if (handler == null)
             {
-                handler = new UDPHandler(socket, _config.GetCurrentServer(), remoteEndPoint);
+                handler = new UDPHandler(socket, _controller.GetAServer(IStrategyCallerType.UDP, remoteEndPoint), remoteEndPoint);
                 _cache.add(remoteEndPoint, handler);
             }
             handler.Send(firstPacket, length);
@@ -107,9 +108,11 @@ namespace Shadowsocks.Controller
                 }
                 catch (ObjectDisposedException)
                 {
+                    // TODO: handle the ObjectDisposedException
                 }
                 catch (Exception)
                 {
+                    // TODO: need more think about handle other Exceptions, or should remove this catch().
                 }
                 finally
                 {
@@ -123,9 +126,11 @@ namespace Shadowsocks.Controller
                 }
                 catch (ObjectDisposedException)
                 {
+                    // TODO: handle the ObjectDisposedException
                 }
                 catch (Exception)
                 {
+                    // TODO: need more think about handle other Exceptions, or should remove this catch().
                 }
                 finally
                 {
@@ -133,6 +138,8 @@ namespace Shadowsocks.Controller
             }
         }
     }
+
+
     // cc by-sa 3.0 http://stackoverflow.com/a/3719378/1124054
     class LRUCache<K, V> where V : UDPRelay.UDPHandler
     {
@@ -195,5 +202,4 @@ namespace Shadowsocks.Controller
         public K key;
         public V value;
     }
-
 }

shadowsocks-csharp/Controller/UpdateChecker.cs → shadowsocks-csharp/Controller/Service/UpdateChecker.cs

@@ -12,13 +12,13 @@ namespace Shadowsocks.Controller
 {
     public class UpdateChecker
     {
-        private const string UpdateURL = "https://api.github.com/repos/shadowsocks/shadowsocks-csharp/releases";
+        private const string UpdateURL = "https://api.github.com/repos/shadowsocks/shadowsocks-windows/releases";
 
         public string LatestVersionNumber;
         public string LatestVersionURL;
         public event EventHandler NewVersionFound;
 
-        public const string Version = "2.4";
+        public const string Version = "2.5.6";
 
         public void CheckUpdate(Configuration config)
         {
@@ -53,7 +53,6 @@ namespace Shadowsocks.Controller
             {
                 return CompareVersion(ParseVersionFromURL(x), ParseVersionFromURL(y));
             }
-
         }
 
         private static string ParseVersionFromURL(string url)
@@ -80,30 +79,6 @@ namespace Shadowsocks.Controller
             {
                 return false;
             }
-            // check dotnet 4.0
-            AssemblyName[] references = Assembly.GetExecutingAssembly().GetReferencedAssemblies();
-            Version dotNetVersion = Environment.Version;
-            foreach (AssemblyName reference in references)
-            {
-                if (reference.Name == "mscorlib")
-                {
-                    dotNetVersion = reference.Version;
-                }
-            }
-            if (dotNetVersion.Major >= 4)
-            {
-                if (url.IndexOf("dotnet4.0") < 0)
-                {
-                    return false;
-                }
-            }
-            else
-            {
-                if (url.IndexOf("dotnet4.0") >= 0)
-                {
-                    return false;
-                }
-            }
             string version = ParseVersionFromURL(url);
             if (version == null)
             {
@@ -154,7 +129,7 @@ namespace Shadowsocks.Controller
             }
             catch (Exception ex)
             {
-                Console.WriteLine(ex.ToString());
+                Logging.Debug(ex.ToString());
                 return;
             }
         }

shadowsocks-csharp/Controller/ShadowsocksController.cs

@@ -5,6 +5,8 @@ using System.Collections.Generic;
 using System.Text;
 using System.Threading;
 using System.Net.Sockets;
+using Shadowsocks.Controller.Strategy;
+using System.Net;
 
 namespace Shadowsocks.Controller
 {
@@ -20,8 +22,10 @@ namespace Shadowsocks.Controller
         private Listener _listener;
         private PACServer _pacServer;
         private Configuration _config;
+        private StrategyManager _strategyManager;
         private PolipoRunner polipoRunner;
         private GFWListUpdater gfwListUpdater;
+        private AvailabilityStatistics _availabilityStatics;
         private bool stopped = false;
 
         private bool _systemProxyIsDirty = false;
@@ -35,7 +39,7 @@ namespace Shadowsocks.Controller
         public event EventHandler EnableStatusChanged;
         public event EventHandler EnableGlobalChanged;
         public event EventHandler ShareOverLANStatusChanged;
-        
+
         // when user clicked Edit PAC, and PAC file has already created
         public event EventHandler<PathEventArgs> PACFileReadyToOpen;
         public event EventHandler<PathEventArgs> UserRuleFileReadyToOpen;
@@ -49,6 +53,8 @@ namespace Shadowsocks.Controller
         public ShadowsocksController()
         {
             _config = Configuration.Load();
+            _strategyManager = new StrategyManager(this);
+            StartReleasingMemory();
         }
 
         public void Start()
@@ -70,11 +76,48 @@ namespace Shadowsocks.Controller
         }
 
         // always return copy
-        public Configuration GetConfiguration()
+        public Configuration GetConfigurationCopy()
         {
             return Configuration.Load();
         }
 
+        // always return current instance
+        public Configuration GetCurrentConfiguration()
+        {
+            return _config;
+        }
+
+        public IList<IStrategy> GetStrategies()
+        {
+            return _strategyManager.GetStrategies();
+        }
+
+        public IStrategy GetCurrentStrategy()
+        {
+            foreach (var strategy in _strategyManager.GetStrategies())
+            {
+                if (strategy.ID == this._config.strategy)
+                {
+                    return strategy;
+                }
+            }
+            return null;
+        }
+
+        public Server GetAServer(IStrategyCallerType type, IPEndPoint localIPEndPoint)
+        {
+            IStrategy strategy = GetCurrentStrategy();
+            if (strategy != null)
+            {
+                return strategy.GetAServer(type, localIPEndPoint);
+            }
+            if (_config.index < 0)
+            {
+                _config.index = 0;
+            }
+            return GetCurrentServer();
+        }
+
         public void SaveServers(List<Server> servers, int localPort)
         {
             _config.configs = servers;
@@ -134,6 +177,14 @@ namespace Shadowsocks.Controller
         public void SelectServerIndex(int index)
         {
             _config.index = index;
+            _config.strategy = null;
+            SaveConfig(_config);
+        }
+
+        public void SelectStrategy(string strategyID)
+        {
+            _config.index = -1;
+            _config.strategy = strategyID;
             SaveConfig(_config);
         }
 
@@ -179,6 +230,11 @@ namespace Shadowsocks.Controller
         public string GetQRCodeForCurrentServer()
         {
             Server server = GetCurrentServer();
+            return GetQRCode(server);
+        }
+
+        public static string GetQRCode(Server server)
+        {
             string parts = server.method + ":" + server.password + "@" + server.server + ":" + server.server_port;
             string base64 = System.Convert.ToBase64String(Encoding.UTF8.GetBytes(parts));
             return "ss://" + base64;
@@ -192,6 +248,16 @@ namespace Shadowsocks.Controller
             }
         }
 
+        public void ToggleAvailabilityStatistics(bool enabled)
+        {
+            if (_availabilityStatics != null)
+            {
+                _availabilityStatics.Set(enabled);
+                _config.availabilityStatistics = enabled;
+                SaveConfig(_config);
+            }
+        }
+
         public void SavePACUrl(string pacUrl)
         {
             _config.pacUrl = pacUrl;
@@ -241,6 +307,12 @@ namespace Shadowsocks.Controller
                 _listener.Stop();
             }
 
+            if (_availabilityStatics == null)
+            {
+                _availabilityStatics = new AvailabilityStatistics();
+                _availabilityStatics.UpdateConfiguration(_config);
+            }
+
             // don't put polipoRunner.Start() before pacServer.Stop()
             // or bind will fail when switching bind address from 0.0.0.0 to 127.0.0.1
             // though UseShellExecute is set to true now
@@ -248,10 +320,16 @@ namespace Shadowsocks.Controller
             polipoRunner.Stop();
             try
             {
+                var strategy = GetCurrentStrategy();
+                if (strategy != null)
+                {
+                    strategy.ReloadServers();
+                }
+
                 polipoRunner.Start(_config);
 
-                TCPRelay tcpRelay = new TCPRelay(_config);
-                UDPRelay udpRelay = new UDPRelay(_config);
+                TCPRelay tcpRelay = new TCPRelay(this);
+                UDPRelay udpRelay = new UDPRelay(this);
                 List<Listener.Service> services = new List<Listener.Service>();
                 services.Add(tcpRelay);
                 services.Add(udpRelay);
@@ -282,17 +360,15 @@ namespace Shadowsocks.Controller
             }
 
             UpdateSystemProxy();
-            Util.Utils.ReleaseMemory();
+            Util.Utils.ReleaseMemory(true);
         }
 
-
         protected void SaveConfig(Configuration newConfig)
         {
             Configuration.Save(newConfig);
             Reload();
         }
 
-
         private void UpdateSystemProxy()
         {
             if (_config.enabled)
@@ -339,7 +415,7 @@ namespace Shadowsocks.Controller
         {
             while (true)
             {
-                Util.Utils.ReleaseMemory();
+                Util.Utils.ReleaseMemory(false);
                 Thread.Sleep(30 * 1000);
             }
         }

shadowsocks-csharp/Controller/Strategy/BalancingStrategy.cs

@@ -0,0 +1,71 @@
+using Shadowsocks.Controller;
+using Shadowsocks.Model;
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Text;
+
+namespace Shadowsocks.Controller.Strategy
+{
+    class BalancingStrategy : IStrategy
+    {
+        ShadowsocksController _controller;
+        Random _random;
+
+        public BalancingStrategy(ShadowsocksController controller)
+        {
+            _controller = controller;
+            _random = new Random();
+        }
+
+        public string Name
+        {
+            get { return I18N.GetString("Load Balance"); }
+        }
+
+        public string ID
+        {
+            get { return "com.shadowsocks.strategy.balancing"; }
+        }
+
+        public void ReloadServers()
+        {
+            // do nothing
+        }
+
+        public Server GetAServer(IStrategyCallerType type, IPEndPoint localIPEndPoint)
+        {
+            var configs = _controller.GetCurrentConfiguration().configs;
+            int index;
+            if (type == IStrategyCallerType.TCP)
+            {
+                index = _random.Next();
+            }
+            else
+            {
+                index = localIPEndPoint.GetHashCode();
+            }
+            return configs[index % configs.Count];
+        }
+
+        public void UpdateLatency(Model.Server server, TimeSpan latency)
+        {
+            // do nothing
+        }
+
+        public void UpdateLastRead(Model.Server server)
+        {
+            // do nothing
+        }
+
+        public void UpdateLastWrite(Model.Server server)
+        {
+            // do nothing
+        }
+
+        public void SetFailure(Model.Server server)
+        {
+            // do nothing
+        }
+    }
+}

shadowsocks-csharp/Controller/Strategy/HighAvailabilityStrategy.cs

@@ -0,0 +1,185 @@
+using Shadowsocks.Model;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Shadowsocks.Controller.Strategy
+{
+    class HighAvailabilityStrategy : IStrategy
+    {
+        protected ServerStatus _currentServer;
+        protected Dictionary<Server, ServerStatus> _serverStatus;
+        ShadowsocksController _controller;
+        Random _random;
+
+        public class ServerStatus
+        {
+            // time interval between SYN and SYN+ACK
+            public TimeSpan latency;
+            public DateTime lastTimeDetectLatency;
+
+            // last time anything received
+            public DateTime lastRead;
+
+            // last time anything sent
+            public DateTime lastWrite;
+
+            // connection refused or closed before anything received
+            public DateTime lastFailure;
+
+            public Server server;
+
+            public double score;
+        }
+
+        public HighAvailabilityStrategy(ShadowsocksController controller)
+        {
+            _controller = controller;
+            _random = new Random();
+            _serverStatus = new Dictionary<Server, ServerStatus>();
+        }
+
+        public string Name
+        {
+            get { return I18N.GetString("High Availability"); }
+        }
+
+        public string ID
+        {
+            get { return "com.shadowsocks.strategy.ha"; }
+        }
+
+        public void ReloadServers()
+        {
+            // make a copy to avoid locking
+            var newServerStatus = new Dictionary<Server, ServerStatus>(_serverStatus);
+
+            foreach (var server in _controller.GetCurrentConfiguration().configs)
+            {
+                if (!newServerStatus.ContainsKey(server))
+                {
+                    var status = new ServerStatus();
+                    status.server = server;
+                    status.lastFailure = DateTime.MinValue;
+                    status.lastRead = DateTime.Now;
+                    status.lastWrite = DateTime.Now;
+                    status.latency = new TimeSpan(0, 0, 0, 0, 10);
+                    status.lastTimeDetectLatency = DateTime.Now;
+                    newServerStatus[server] = status;
+                }
+                else
+                {
+                    // update settings for existing server
+                    newServerStatus[server].server = server;
+                }
+            }
+            _serverStatus = newServerStatus;
+
+            ChooseNewServer();
+        }
+
+        public Server GetAServer(IStrategyCallerType type, System.Net.IPEndPoint localIPEndPoint)
+        {
+            if (type == IStrategyCallerType.TCP)
+            {
+                ChooseNewServer();
+            }
+            if (_currentServer == null)
+            {
+                return null;
+            }
+            return _currentServer.server;
+        }
+
+        /**
+         * once failed, try after 5 min
+         * and (last write - last read) < 5s
+         * and (now - last read) <  5s  // means not stuck
+         * and latency < 200ms, try after 30s
+         */
+        public void ChooseNewServer()
+        {
+            ServerStatus oldServer = _currentServer;
+            List<ServerStatus> servers = new List<ServerStatus>(_serverStatus.Values);
+            DateTime now = DateTime.Now;
+            foreach (var status in servers)
+            {
+                // all of failure, latency, (lastread - lastwrite) normalized to 1000, then
+                // 100 * failure - 2 * latency - 0.5 * (lastread - lastwrite)
+                status.score =
+                    100 * 1000 * Math.Min(5 * 60, (now - status.lastFailure).TotalSeconds)
+                    -2 * 5 * (Math.Min(2000, status.latency.TotalMilliseconds) / (1 + (now - status.lastTimeDetectLatency).TotalSeconds / 30 / 10) +
+                    -0.5 * 200 * Math.Min(5, (status.lastRead - status.lastWrite).TotalSeconds));
+                Logging.Debug(String.Format("server: {0} latency:{1} score: {2}", status.server.FriendlyName(), status.latency, status.score));
+            }
+            ServerStatus max = null;
+            foreach (var status in servers)
+            {
+                if (max == null)
+                {
+                    max = status;
+                }
+                else
+                {
+                    if (status.score >= max.score)
+                    {
+                        max = status;
+                    }
+                }
+            }
+            if (max != null)
+            {
+                if (_currentServer == null || max.score - _currentServer.score > 200)
+                {
+                    _currentServer = max;
+                    Console.WriteLine("HA switching to server: {0}", _currentServer.server.FriendlyName());
+                }
+            }
+        }
+
+        public void UpdateLatency(Model.Server server, TimeSpan latency)
+        {
+            Logging.Debug(String.Format("latency: {0} {1}", server.FriendlyName(), latency));
+
+            ServerStatus status;
+            if (_serverStatus.TryGetValue(server, out status))
+            {
+                status.latency = latency;
+                status.lastTimeDetectLatency = DateTime.Now;
+            }
+        }
+
+        public void UpdateLastRead(Model.Server server)
+        {
+            Logging.Debug(String.Format("last read: {0}", server.FriendlyName()));
+
+            ServerStatus status;
+            if (_serverStatus.TryGetValue(server, out status))
+            {
+                status.lastRead = DateTime.Now;
+            }
+        }
+
+        public void UpdateLastWrite(Model.Server server)
+        {
+            Logging.Debug(String.Format("last write: {0}", server.FriendlyName()));
+
+            ServerStatus status;
+            if (_serverStatus.TryGetValue(server, out status))
+            {
+                status.lastWrite = DateTime.Now;
+            }
+        }
+
+        public void SetFailure(Model.Server server)
+        {
+            Logging.Debug(String.Format("failure: {0}", server.FriendlyName()));
+
+            ServerStatus status;
+            if (_serverStatus.TryGetValue(server, out status))
+            {
+                status.lastFailure = DateTime.Now;
+            }
+        }
+    }
+}

shadowsocks-csharp/Controller/Strategy/IStrategy.cs

@@ -0,0 +1,56 @@
+using Shadowsocks.Model;
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Text;
+
+namespace Shadowsocks.Controller.Strategy
+{
+    public enum IStrategyCallerType
+    {
+        TCP,
+        UDP
+    }
+
+    /*
+     * IStrategy
+     *
+     * Subclasses must be thread-safe
+     */
+    public interface IStrategy
+    {
+        string Name { get; }
+
+        string ID { get; }
+
+        /*
+         * Called when servers need to be reloaded, i.e. new configuration saved
+         */
+        void ReloadServers();
+
+        /*
+         * Get a new server to use in TCPRelay or UDPRelay
+         */
+        Server GetAServer(IStrategyCallerType type, IPEndPoint localIPEndPoint);
+
+        /*
+         * TCPRelay will call this when latency of a server detected
+         */
+        void UpdateLatency(Server server, TimeSpan latency);
+
+        /*
+         * TCPRelay will call this when reading from a server
+         */
+        void UpdateLastRead(Server server);
+
+        /*
+         * TCPRelay will call this when writing to a server
+         */
+        void UpdateLastWrite(Server server);
+
+        /*
+         * TCPRelay will call this when fatal failure detected
+         */
+        void SetFailure(Server server);
+    }
+}

shadowsocks-csharp/Controller/Strategy/SimplyChooseByStatisticsStrategy.cs

@@ -0,0 +1,176 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Text;
+using Shadowsocks.Model;
+using System.IO;
+using System.Net.NetworkInformation;
+using System.Threading;
+
+namespace Shadowsocks.Controller.Strategy
+{
+    class SimplyChooseByStatisticsStrategy : IStrategy
+    {
+        private ShadowsocksController _controller;
+        private Server _currentServer;
+        private Timer timer;
+        private Dictionary<string, StatisticsData> statistics;
+        private static readonly int CachedInterval = 30 * 60 * 1000; //choose a new server every 30 minutes
+
+        public SimplyChooseByStatisticsStrategy(ShadowsocksController controller)
+        {
+            _controller = controller;
+            var servers = controller.GetCurrentConfiguration().configs;
+            int randomIndex = new Random().Next() % servers.Count();
+            _currentServer = servers[randomIndex];  //choose a server randomly at first
+            timer = new Timer(ReloadStatisticsAndChooseAServer);
+        }
+
+        private void ReloadStatisticsAndChooseAServer(object obj)
+        {
+            Logging.Debug("Reloading statistics and choose a new server....");
+            List<Server> servers = _controller.GetCurrentConfiguration().configs;
+            LoadStatistics();
+            ChooseNewServer(servers);
+        }
+
+        /*
+        return a dict:
+        {
+            'ServerFriendlyName1':StatisticsData,
+            'ServerFriendlyName2':...
+        }
+        */
+        private void LoadStatistics()
+        {
+            try
+            {
+                var path = AvailabilityStatistics.AvailabilityStatisticsFile;
+                Logging.Debug(string.Format("loading statistics from{0}", path));
+                statistics = (from l in File.ReadAllLines(path)
+                                  .Skip(1)
+                                  let strings = l.Split(new[] { "," }, StringSplitOptions.RemoveEmptyEntries)
+                                  let rawData = new
+                                  {
+                                      ServerName = strings[1],
+                                      IPStatus = strings[2],
+                                      RoundtripTime = int.Parse(strings[3])
+                                  }
+                                  group rawData by rawData.ServerName into server
+                                  select new
+                                  {
+                                      ServerName = server.Key,
+                                      data = new StatisticsData
+                                      {
+                                          SuccessTimes = server.Count(data => IPStatus.Success.ToString().Equals(data.IPStatus)),
+                                          TimedOutTimes = server.Count(data => IPStatus.TimedOut.ToString().Equals(data.IPStatus)),
+                                          AverageResponse = Convert.ToInt32(server.Average(data => data.RoundtripTime)),
+                                          MinResponse = server.Min(data => data.RoundtripTime),
+                                          MaxResponse = server.Max(data => data.RoundtripTime)
+                                      }
+                                  }).ToDictionary(server => server.ServerName, server => server.data);
+            }
+            catch (Exception e)
+            {
+                Logging.LogUsefulException(e);
+            }
+        }
+
+        //return the score by data
+        //server with highest score will be choosen
+        private static double GetScore(StatisticsData data)
+        {
+            return (double)data.SuccessTimes / (data.SuccessTimes + data.TimedOutTimes); //simply choose min package loss
+        }
+
+        private class StatisticsData
+        {
+            public int SuccessTimes;
+            public int TimedOutTimes;
+            public int AverageResponse;
+            public int MinResponse;
+            public int MaxResponse;
+        }
+
+        private void ChooseNewServer(List<Server> servers)
+        {
+            if (statistics == null)
+            {
+                return;
+            }
+            try
+            {
+                var bestResult = (from server in servers
+                                  let name = server.FriendlyName()
+                                  where statistics.ContainsKey(name)
+                                  select new
+                                  {
+                                      server,
+                                      score = GetScore(statistics[name])
+                                  }
+                                  ).Aggregate((result1, result2) => result1.score > result2.score ? result1 : result2);
+
+                if (_controller.GetCurrentStrategy().ID == ID && _currentServer != bestResult.server) //output when enabled
+                {
+                    Console.WriteLine("Switch to server: {0} by package loss:{1}", bestResult.server.FriendlyName(), 1 - bestResult.score);
+                }
+                _currentServer = bestResult.server;
+            }
+            catch (Exception e)
+            {
+                Logging.LogUsefulException(e);
+            }
+        }
+
+        public string ID
+        {
+            get { return "com.shadowsocks.strategy.scbs"; }
+        }
+
+        public string Name
+        {
+            get { return I18N.GetString("Choose By Total Package Loss"); }
+        }
+
+        public Server GetAServer(IStrategyCallerType type, IPEndPoint localIPEndPoint)
+        {
+            var oldServer = _currentServer;
+            if (oldServer == null)
+            {
+                ChooseNewServer(_controller.GetCurrentConfiguration().configs);
+            }
+            if (oldServer != _currentServer)
+            {
+            }
+            return _currentServer;  //current server cached for CachedInterval
+        }
+
+        public void ReloadServers()
+        {
+            ChooseNewServer(_controller.GetCurrentConfiguration().configs);
+            timer?.Change(0, CachedInterval);
+        }
+
+        public void SetFailure(Server server)
+        {
+            Logging.Debug(String.Format("failure: {0}", server.FriendlyName()));
+        }
+
+        public void UpdateLastRead(Server server)
+        {
+            //TODO: combine this part of data with ICMP statics
+        }
+
+        public void UpdateLastWrite(Server server)
+        {
+            //TODO: combine this part of data with ICMP statics
+        }
+
+        public void UpdateLatency(Server server, TimeSpan latency)
+        {
+            //TODO: combine this part of data with ICMP statics
+        }
+
+    }
+}

shadowsocks-csharp/Controller/Strategy/StrategyManager.cs

@@ -0,0 +1,24 @@
+using Shadowsocks.Controller;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Shadowsocks.Controller.Strategy
+{
+    class StrategyManager
+    {
+        List<IStrategy> _strategies;
+        public StrategyManager(ShadowsocksController controller)
+        {
+            _strategies = new List<IStrategy>();
+            _strategies.Add(new BalancingStrategy(controller));
+            _strategies.Add(new HighAvailabilityStrategy(controller));
+            _strategies.Add(new SimplyChooseByStatisticsStrategy(controller));
+            // TODO: load DLL plugins
+        }
+        public IList<IStrategy> GetStrategies()
+        {
+            return _strategies;
+        }
+    }
+}

shadowsocks-csharp/Controller/SystemProxy.cs → shadowsocks-csharp/Controller/System/SystemProxy.cs

@@ -55,6 +55,7 @@ namespace Shadowsocks.Controller
                         else
                             pacUrl = "http://127.0.0.1:" + config.localPort.ToString() + "/pac?t=" + GetTimestamp(DateTime.Now);
                         registry.SetValue("ProxyEnable", 0);
+                        var readProxyServer = registry.GetValue("ProxyServer");
                         registry.SetValue("ProxyServer", "");
                         registry.SetValue("AutoConfigURL", pacUrl);
                     }
@@ -65,6 +66,8 @@ namespace Shadowsocks.Controller
                     registry.SetValue("ProxyServer", "");
                     registry.SetValue("AutoConfigURL", "");
                 }
+                //Set AutoDetectProxy Off
+                IEAutoDetectProxy(false);
                 SystemProxy.NotifyIE();
                 //Must Notify IE first, or the connections do not chanage
                 CopyProxySettingFromLan();
@@ -106,5 +109,30 @@ namespace Shadowsocks.Controller
         {
             return value.ToString("yyyyMMddHHmmssffff");
         }
+
+        /// <summary>
+        /// Checks or unchecks the IE Options Connection setting of "Automatically detect Proxy"
+        /// </summary>
+        /// <param name="set">Provide 'true' if you want to check the 'Automatically detect Proxy' check box. To uncheck, pass 'false'</param>
+        private static void IEAutoDetectProxy(bool set)
+        {
+            RegistryKey registry =
+                Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\\Connections",
+                    true);
+            byte[] defConnection = (byte[])registry.GetValue("DefaultConnectionSettings");
+            byte[] savedLegacySetting = (byte[])registry.GetValue("SavedLegacySettings");
+            if (set)
+            {
+                defConnection[8] = Convert.ToByte(defConnection[8] & 8);
+                savedLegacySetting[8] = Convert.ToByte(savedLegacySetting[8] & 8);
+            }
+            else
+            {
+                defConnection[8] = Convert.ToByte(defConnection[8] & ~8);
+                savedLegacySetting[8] = Convert.ToByte(savedLegacySetting[8] & ~8);
+            }
+            registry.SetValue("DefaultConnectionSettings", defConnection);
+            registry.SetValue("SavedLegacySettings", savedLegacySetting);
+        }
     }
 }

shadowsocks-csharp/Data/cn.txt

@@ -19,10 +19,14 @@ Update Local PAC from GFWList=从 GFWList 更新本地 PAC
 Edit User Rule for GFWList...=编辑 GFWList 的用户规则...
 Show QRCode...=显示二维码...
 Scan QRCode from Screen...=扫描屏幕上的二维码...
+Availability Statistics=统计可用性
 Show Logs...=显示日志...
 About...=关于...
 Quit=退出
 Edit Servers=编辑服务器
+Load Balance=负载均衡
+High Availability=高可用
+Choose By Total Package Loss=累计丢包率
 
 # Config Form
 
@@ -38,6 +42,19 @@ Remarks=备注
 OK=确定
 Cancel=取消
 New server=未配置的服务器
+Move &Up=上移(&U)
+Move D&own=下移(&O)
+
+# Log Form
+
+&File=文件(&F)
+&Open Location=在资源管理器中打开(&O)
+E&xit=退出(&X)
+&Clean logs=清空(&C)
+&Font=字体(&F)
+&Wrap text=自动换行(&W)
+&Top most=置顶(&T)
+Log Viewer=日志查看器
 
 # QRCode Form
 
@@ -69,7 +86,10 @@ Failed to update PAC file =更新 PAC 文件失败
 PAC updated=更新 PAC 成功
 No updates found. Please report to GFWList if you have problems with it.=未发现更新。如有问题请提交给 GFWList。
 No QRCode found. Try to zoom in or move it to the center of the screen.=未发现二维码，尝试把它放大或移动到靠近屏幕中间的位置
+Shadowsocks is already running.=Shadowsocks 已经在运行。
+Find Shadowsocks icon in your notify tray.=请在任务栏里寻找 Shadowsocks 图标。
+If you want to start multiple Shadowsocks, make a copy in another directory.=如果想同时启动多个，可以另外复制一份到别的目录。
 Failed to decode QRCode=无法解析二维码
 Failed to update registry=无法修改注册表
 System Proxy On: =系统代理已启用：
-Running: Port {0}=正在运行：端口 {0}
+Running: Port {0}=正在运行：端口 {0}

shadowsocks-csharp/Data/polipo_config.txt

@@ -1,10 +0,0 @@
-proxyAddress = "__POLIPO_BIND_IP__"
-proxyPort = 8123
-
-socksParentProxy = "127.0.0.1:__SOCKS_PORT__"
-socksProxyType = socks5
-diskCacheRoot = ""
-localDocumentRoot = ""
-
-allowedPorts = 1-65535
-tunnelAllowedPorts = 1-65535

shadowsocks-csharp/Data/privoxy_conf.txt

@@ -0,0 +1,5 @@
+listen-address __POLIPO_BIND_IP__:8123
+show-on-task-bar 0
+activity-animation 0
+forward-socks5 / 127.0.0.1:__SOCKS_PORT__ .
+hide-console

shadowsocks-csharp/Encryption/IVEncryptor.cs

@@ -26,7 +26,6 @@ namespace Shadowsocks.Encryption
         protected int keyLen;
         protected int ivLen;
 
-
         public IVEncryptor(string method, string password)
             : base(method, password)
         {

shadowsocks-csharp/Encryption/PolarSSL.cs

@@ -1,5 +1,6 @@
 using Shadowsocks.Controller;
 using Shadowsocks.Properties;
+using Shadowsocks.Util;
 using System;
 using System.Collections.Generic;
 using System.IO;
@@ -18,7 +19,7 @@ namespace Shadowsocks.Encryption
 
         static PolarSSL()
         {
-            string tempPath = Path.GetTempPath();
+            string tempPath = Utils.GetTempPath();
             string dllPath = tempPath + "/libsscrypto.dll";
             try
             {
@@ -49,7 +50,6 @@ namespace Shadowsocks.Encryption
         [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
         public extern static int aes_crypt_cfb128(IntPtr ctx, int mode, int length, ref int iv_off, byte[] iv, byte[] input, byte[] output);
 
-
         public const int ARC4_CTX_SIZE = 264;
 
         [DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]

shadowsocks-csharp/Encryption/Sodium.cs

@@ -1,5 +1,6 @@
 using Shadowsocks.Controller;
 using Shadowsocks.Properties;
+using Shadowsocks.Util;
 using System;
 using System.Collections.Generic;
 using System.IO;
@@ -14,7 +15,7 @@ namespace Shadowsocks.Encryption
 
         static Sodium()
         {
-            string tempPath = Path.GetTempPath();
+            string tempPath = Utils.GetTempPath();
             string dllPath = tempPath + "/libsscrypto.dll";
             try
             {

shadowsocks-csharp/Encryption/SodiumEncryptor.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Text;
+using System.Threading;
 
 namespace Shadowsocks.Encryption
 {
@@ -12,19 +13,17 @@ namespace Shadowsocks.Encryption
 
         const int SODIUM_BLOCK_SIZE = 64;
 
+        static byte[] sodiumBuf = new byte[MAX_INPUT_SIZE + SODIUM_BLOCK_SIZE];
+
         protected int _encryptBytesRemaining;
         protected int _decryptBytesRemaining;
         protected ulong _encryptIC;
         protected ulong _decryptIC;
-        protected byte[] _encryptBuf;
-        protected byte[] _decryptBuf;
 
         public SodiumEncryptor(string method, string password)
             : base(method, password)
         {
             InitKey(method, password);
-            _encryptBuf = new byte[MAX_INPUT_SIZE + SODIUM_BLOCK_SIZE];
-            _decryptBuf = new byte[MAX_INPUT_SIZE + SODIUM_BLOCK_SIZE];
         }
 
         private static Dictionary<string, int[]> _ciphers = new Dictionary<string, int[]> {
@@ -47,48 +46,51 @@ namespace Shadowsocks.Encryption
             // TODO write a unidirection cipher so we don't have to if if if
             int bytesRemaining;
             ulong ic;
-            byte[] sodiumBuf;
             byte[] iv;
-            if (isCipher)
-            {
-                bytesRemaining = _encryptBytesRemaining;
-                ic = _encryptIC;
-                sodiumBuf = _encryptBuf;
-                iv = _encryptIV;
-            }
-            else
-            {
-                bytesRemaining = _decryptBytesRemaining;
-                ic = _decryptIC;
-                sodiumBuf = _decryptBuf;
-                iv = _decryptIV;
-            }
-            int padding = bytesRemaining;
-            Buffer.BlockCopy(buf, 0, sodiumBuf, padding, length);
 
-            switch (_cipher)
+            // I'm tired. just add a big lock
+            // let's optimize for RAM instead of CPU
+            lock(sodiumBuf)
             {
-                case CIPHER_SALSA20:
-                    Sodium.crypto_stream_salsa20_xor_ic(sodiumBuf, sodiumBuf, (ulong)(padding + length), iv, ic, _key);
-                    break;
-                case CIPHER_CHACHA20:
-                    Sodium.crypto_stream_chacha20_xor_ic(sodiumBuf, sodiumBuf, (ulong)(padding + length), iv, ic, _key);
-                    break;
-            }
-            Buffer.BlockCopy(sodiumBuf, padding, outbuf, 0, length);
-            padding += length;
-            ic += (ulong)padding / SODIUM_BLOCK_SIZE;
-            bytesRemaining = padding % SODIUM_BLOCK_SIZE;
+                if (isCipher)
+                {
+                    bytesRemaining = _encryptBytesRemaining;
+                    ic = _encryptIC;
+                    iv = _encryptIV;
+                }
+                else
+                {
+                    bytesRemaining = _decryptBytesRemaining;
+                    ic = _decryptIC;
+                    iv = _decryptIV;
+                }
+                int padding = bytesRemaining;
+                Buffer.BlockCopy(buf, 0, sodiumBuf, padding, length);
 
-            if (isCipher)
-            {
-                _encryptBytesRemaining = bytesRemaining;
-                _encryptIC = ic;
-            }
-            else
-            {
-                _decryptBytesRemaining = bytesRemaining;
-                _decryptIC = ic;
+                switch (_cipher)
+                {
+                    case CIPHER_SALSA20:
+                        Sodium.crypto_stream_salsa20_xor_ic(sodiumBuf, sodiumBuf, (ulong)(padding + length), iv, ic, _key);
+                        break;
+                    case CIPHER_CHACHA20:
+                        Sodium.crypto_stream_chacha20_xor_ic(sodiumBuf, sodiumBuf, (ulong)(padding + length), iv, ic, _key);
+                        break;
+                }
+                Buffer.BlockCopy(sodiumBuf, padding, outbuf, 0, length);
+                padding += length;
+                ic += (ulong)padding / SODIUM_BLOCK_SIZE;
+                bytesRemaining = padding % SODIUM_BLOCK_SIZE;
+
+                if (isCipher)
+                {
+                    _encryptBytesRemaining = bytesRemaining;
+                    _encryptIC = ic;
+                }
+                else
+                {
+                    _decryptBytesRemaining = bytesRemaining;
+                    _decryptIC = ic;
+                }
             }
         }
 

shadowsocks-csharp/Encryption/TableEncryptor.cs

@@ -41,7 +41,6 @@ namespace Shadowsocks.Encryption
             outlength = length;
         }
 
-
         public override void Decrypt(byte[] buf, int length, byte[] outbuf, out int outlength)
         {
             byte[] result = new byte[length];
@@ -100,7 +99,6 @@ namespace Shadowsocks.Encryption
             return sorted;
         }
 
-
         public override void Dispose()
         {
         }

shadowsocks-csharp/Model/Configuration.cs

@@ -11,6 +11,9 @@ namespace Shadowsocks.Model
     public class Configuration
     {
         public List<Server> configs;
+
+        // when strategy is set, index is ignored
+        public string strategy;
         public int index;
         public bool global;
         public bool enabled;
@@ -19,6 +22,7 @@ namespace Shadowsocks.Model
         public int localPort;
         public string pacUrl;
         public bool useOnlinePac;
+        public bool availabilityStatistics;
 
         private static string CONFIG_FILE = "gui-config.json";
 
@@ -52,6 +56,13 @@ namespace Shadowsocks.Model
                 {
                     config.localPort = 1080;
                 }
+                if (config.index == -1)
+                {
+                    if (config.strategy == null)
+                    {
+                        config.index = 0;
+                    }
+                }
                 return config;
             }
             catch (Exception e)
@@ -79,9 +90,16 @@ namespace Shadowsocks.Model
             {
                 config.index = config.configs.Count - 1;
             }
-            if (config.index < 0)
+            if (config.index < -1)
+            {
+                config.index = -1;
+            }
+            if (config.index == -1)
             {
-                config.index = 0;
+                if (config.strategy == null)
+                {
+                    config.index = 0;
+                }
             }
             config.isDefault = false;
             try
@@ -118,6 +136,11 @@ namespace Shadowsocks.Model
             {
                 throw new ArgumentException(I18N.GetString("Port out of range"));
             }
+        }
+
+        public static void CheckLocalPort(int port)
+        {
+            CheckPort(port);
             if (port == 8123)
             {
                 throw new ArgumentException(I18N.GetString("Port can't be 8123"));

shadowsocks-csharp/Model/Server.cs

@@ -18,6 +18,17 @@ namespace Shadowsocks.Model
         public string method;
         public string remarks;
 
+        public override int GetHashCode()
+        {
+            return server.GetHashCode() ^ server_port;
+        }
+
+        public override bool Equals(object obj)
+        {
+            Server o2 = (Server)obj;
+            return this.server == o2.server && this.server_port == o2.server_port;
+        }
+
         public string FriendlyName()
         {
             if (string.IsNullOrEmpty(server))

shadowsocks-csharp/Program.cs

@@ -18,8 +18,8 @@ namespace Shadowsocks
         [STAThread]
         static void Main()
         {
-            Util.Utils.ReleaseMemory();
-            using (Mutex mutex = new Mutex(false, "Global\\" + "71981632-A427-497F-AB91-241CD227EC1F"))
+            Util.Utils.ReleaseMemory(true);
+            using (Mutex mutex = new Mutex(false, "Global\\Shadowsocks_" + Application.StartupPath.GetHashCode()))
             {
                 Application.EnableVisualStyles();
                 Application.SetCompatibleTextRenderingDefault(false);
@@ -31,7 +31,9 @@ namespace Shadowsocks
                     {
                         Process oldProcess = oldProcesses[0];
                     }
-                    MessageBox.Show("Shadowsocks is already running.\n\nFind Shadowsocks icon in your notify tray.");
+                    MessageBox.Show(I18N.GetString("Find Shadowsocks icon in your notify tray.") + "\n" +
+                        I18N.GetString("If you want to start multiple Shadowsocks, make a copy in another directory."),
+                        I18N.GetString("Shadowsocks is already running."));
                     return;
                 }
                 Directory.SetCurrentDirectory(Application.StartupPath);

shadowsocks-csharp/Properties/Resources.Designer.cs

@@ -1,7 +1,7 @@
 //------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by a tool.
-//     Runtime Version:4.0.30319.34209
+//     Runtime Version:4.0.30319.42000
 //
 //     Changes to this file may cause incorrect behavior and will be lost if
 //     the code is regenerated.
@@ -113,29 +113,34 @@ namespace Shadowsocks.Properties {
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to proxyAddress = &quot;__POLIPO_BIND_IP__&quot;
-        ///proxyPort = 8123
-        ///
-        ///socksParentProxy = &quot;127.0.0.1:__SOCKS_PORT__&quot;
-        ///socksProxyType = socks5
-        ///diskCacheRoot = &quot;&quot;
-        ///localDocumentRoot = &quot;&quot;
-        ///
-        ///allowedPorts = 1-65535
-        ///tunnelAllowedPorts = 1-65535.
+        ///   Looks up a localized resource of type System.Byte[].
+        /// </summary>
+        internal static byte[] mgwz_dll {
+            get {
+                object obj = ResourceManager.GetObject("mgwz_dll", resourceCulture);
+                return ((byte[])(obj));
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to listen-address __POLIPO_BIND_IP__:8123
+        ///show-on-task-bar 0
+        ///activity-animation 0
+        ///forward-socks5 / 127.0.0.1:__SOCKS_PORT__ .
+        ///hide-console.
         /// </summary>
-        internal static string polipo_config {
+        internal static string privoxy_conf {
             get {
-                return ResourceManager.GetString("polipo_config", resourceCulture);
+                return ResourceManager.GetString("privoxy_conf", resourceCulture);
             }
         }
         
         /// <summary>
         ///   Looks up a localized resource of type System.Byte[].
         /// </summary>
-        internal static byte[] polipo_exe {
+        internal static byte[] privoxy_exe {
             get {
-                object obj = ResourceManager.GetObject("polipo_exe", resourceCulture);
+                object obj = ResourceManager.GetObject("privoxy_exe", resourceCulture);
                 return ((byte[])(obj));
             }
         }

shadowsocks-csharp/Properties/Resources.resx

@@ -112,12 +112,12 @@
     <value>2.0</value>
   </resheader>
   <resheader name="reader">
-    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
   <resheader name="writer">
-    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
-  <assembly alias="System.Windows.Forms" name="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
+  <assembly alias="System.Windows.Forms" name="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
   <data name="abp_js" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Data\abp.js.gz;System.Byte[], mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </data>
@@ -127,11 +127,14 @@
   <data name="libsscrypto_dll" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\data\libsscrypto.dll.gz;System.Byte[], mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </data>
-  <data name="polipo_config" type="System.Resources.ResXFileRef, System.Windows.Forms">
-    <value>..\Data\polipo_config.txt;System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089;gb2312</value>
+  <data name="mgwz_dll" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\data\mgwz.dll.gz;System.Byte[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </data>
-  <data name="polipo_exe" type="System.Resources.ResXFileRef, System.Windows.Forms">
-    <value>..\Data\polipo.exe.gz;System.Byte[], mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  <data name="privoxy_conf" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\data\privoxy_conf.txt;System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089;utf-8</value>
+  </data>
+  <data name="privoxy_exe" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\data\privoxy.exe.gz;System.Byte[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </data>
   <data name="proxy_pac_txt" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Data\proxy.pac.txt.gz;System.Byte[], mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>

shadowsocks-csharp/Util/Util.cs

@@ -5,12 +5,31 @@ using System.IO;
 using System.IO.Compression;
 using System.Runtime.InteropServices;
 using System.Text;
+using System.Windows.Forms;
 
 namespace Shadowsocks.Util
 {
     public class Utils
     {
-        public static void ReleaseMemory()
+        // return path to store temporary files
+        public static string GetTempPath()
+        {
+            if (File.Exists(Application.StartupPath + "\\shadowsocks_portable_mode.txt"))
+            {
+                try
+                {
+                    Directory.CreateDirectory(Application.StartupPath + "\\temp");
+                } catch (Exception e)
+                {
+                    Console.WriteLine(e);
+                }
+                // don't use "/", it will fail when we call explorer /select xxx/temp\xxx.log
+                return Application.StartupPath + "\\temp";
+            }
+            return Path.GetTempPath();
+        }
+
+        public static void ReleaseMemory(bool removePages)
         {
             // release any unused pages
             // making the numbers look good in task manager
@@ -20,8 +39,29 @@ namespace Shadowsocks.Util
             // which is part of user experience
             GC.Collect(GC.MaxGeneration);
             GC.WaitForPendingFinalizers();
-            SetProcessWorkingSetSize(Process.GetCurrentProcess().Handle,
-                (UIntPtr)0xFFFFFFFF, (UIntPtr)0xFFFFFFFF);
+            if (removePages)
+            {
+                // as some users have pointed out
+                // removing pages from working set will cause some IO
+                // which lowered user experience for another group of users
+                //
+                // so we do 2 more things here to satisfy them:
+                // 1. only remove pages once when configuration is changed
+                // 2. add more comments here to tell users that calling
+                //    this function will not be more frequent than
+                //    IM apps writing chat logs, or web browsers writing cache files
+                //    if they're so concerned about their disk, they should
+                //    uninstall all IM apps and web browsers
+                //
+                // please open an issue if you're worried about anything else in your computer
+                // no matter it's GPU performance, monitor contrast, audio fidelity
+                // or anything else in the task manager
+                // we'll do as much as we can to help you
+                //
+                // just kidding
+                SetProcessWorkingSetSize(Process.GetCurrentProcess().Handle,
+                    (UIntPtr)0xFFFFFFFF, (UIntPtr)0xFFFFFFFF);
+            }
         }
 
         public static string UnGzip(byte[] buf)

shadowsocks-csharp/View/ConfigForm.Designer.cs

@@ -47,6 +47,9 @@
             this.ServerGroupBox = new System.Windows.Forms.GroupBox();
             this.ServersListBox = new System.Windows.Forms.ListBox();
             this.tableLayoutPanel2 = new System.Windows.Forms.TableLayoutPanel();
+            this.tableLayoutPanel6 = new System.Windows.Forms.TableLayoutPanel();
+            this.MoveDownButton = new System.Windows.Forms.Button();
+            this.MoveUpButton = new System.Windows.Forms.Button();
             this.tableLayoutPanel5 = new System.Windows.Forms.TableLayoutPanel();
             this.ProxyPortTextBox = new System.Windows.Forms.TextBox();
             this.ProxyPortLabel = new System.Windows.Forms.Label();
@@ -55,6 +58,7 @@
             this.tableLayoutPanel1.SuspendLayout();
             this.ServerGroupBox.SuspendLayout();
             this.tableLayoutPanel2.SuspendLayout();
+            this.tableLayoutPanel6.SuspendLayout();
             this.tableLayoutPanel5.SuspendLayout();
             this.tableLayoutPanel3.SuspendLayout();
             this.tableLayoutPanel4.SuspendLayout();
@@ -184,7 +188,7 @@
             // 
             // EncryptionSelect
             // 
-            this.EncryptionSelect.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
+            this.EncryptionSelect.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
             | System.Windows.Forms.AnchorStyles.Right)));
             this.EncryptionSelect.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
             this.EncryptionSelect.FormattingEnabled = true;
@@ -281,6 +285,7 @@
             // 
             this.ServersListBox.FormattingEnabled = true;
             this.ServersListBox.IntegralHeight = false;
+            this.ServersListBox.ItemHeight = 12;
             this.ServersListBox.Location = new System.Drawing.Point(0, 0);
             this.ServersListBox.Margin = new System.Windows.Forms.Padding(0);
             this.ServersListBox.Name = "ServersListBox";
@@ -295,6 +300,7 @@
             this.tableLayoutPanel2.ColumnCount = 2;
             this.tableLayoutPanel2.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle());
             this.tableLayoutPanel2.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle());
+            this.tableLayoutPanel2.Controls.Add(this.tableLayoutPanel6, 0, 2);
             this.tableLayoutPanel2.Controls.Add(this.tableLayoutPanel5, 1, 1);
             this.tableLayoutPanel2.Controls.Add(this.tableLayoutPanel3, 1, 2);
             this.tableLayoutPanel2.Controls.Add(this.ServersListBox, 0, 0);
@@ -310,6 +316,48 @@
             this.tableLayoutPanel2.Size = new System.Drawing.Size(427, 238);
             this.tableLayoutPanel2.TabIndex = 7;
             // 
+            // tableLayoutPanel6
+            // 
+            this.tableLayoutPanel6.AutoSize = true;
+            this.tableLayoutPanel6.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink;
+            this.tableLayoutPanel6.ColumnCount = 2;
+            this.tableLayoutPanel6.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle());
+            this.tableLayoutPanel6.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle());
+            this.tableLayoutPanel6.Controls.Add(this.MoveDownButton, 1, 0);
+            this.tableLayoutPanel6.Controls.Add(this.MoveUpButton, 0, 0);
+            this.tableLayoutPanel6.Dock = System.Windows.Forms.DockStyle.Top;
+            this.tableLayoutPanel6.Location = new System.Drawing.Point(0, 211);
+            this.tableLayoutPanel6.Margin = new System.Windows.Forms.Padding(0);
+            this.tableLayoutPanel6.Name = "tableLayoutPanel6";
+            this.tableLayoutPanel6.RowCount = 1;
+            this.tableLayoutPanel6.RowStyles.Add(new System.Windows.Forms.RowStyle());
+            this.tableLayoutPanel6.Size = new System.Drawing.Size(166, 32);
+            this.tableLayoutPanel6.TabIndex = 10;
+            // 
+            // MoveDownButton
+            // 
+            this.MoveDownButton.Dock = System.Windows.Forms.DockStyle.Right;
+            this.MoveDownButton.Location = new System.Drawing.Point(86, 6);
+            this.MoveDownButton.Margin = new System.Windows.Forms.Padding(3, 6, 0, 3);
+            this.MoveDownButton.Name = "MoveDownButton";
+            this.MoveDownButton.Size = new System.Drawing.Size(80, 23);
+            this.MoveDownButton.TabIndex = 7;
+            this.MoveDownButton.Text = "Move D&own";
+            this.MoveDownButton.UseVisualStyleBackColor = true;
+            this.MoveDownButton.Click += new System.EventHandler(this.MoveDownButton_Click);
+            // 
+            // MoveUpButton
+            // 
+            this.MoveUpButton.Dock = System.Windows.Forms.DockStyle.Left;
+            this.MoveUpButton.Location = new System.Drawing.Point(0, 6);
+            this.MoveUpButton.Margin = new System.Windows.Forms.Padding(0, 6, 3, 3);
+            this.MoveUpButton.Name = "MoveUpButton";
+            this.MoveUpButton.Size = new System.Drawing.Size(80, 23);
+            this.MoveUpButton.TabIndex = 6;
+            this.MoveUpButton.Text = "Move &Up";
+            this.MoveUpButton.UseVisualStyleBackColor = true;
+            this.MoveUpButton.Click += new System.EventHandler(this.MoveUpButton_Click);
+            // 
             // tableLayoutPanel5
             // 
             this.tableLayoutPanel5.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
@@ -418,6 +466,7 @@
             this.ServerGroupBox.PerformLayout();
             this.tableLayoutPanel2.ResumeLayout(false);
             this.tableLayoutPanel2.PerformLayout();
+            this.tableLayoutPanel6.ResumeLayout(false);
             this.tableLayoutPanel5.ResumeLayout(false);
             this.tableLayoutPanel5.PerformLayout();
             this.tableLayoutPanel3.ResumeLayout(false);
@@ -453,6 +502,9 @@
         private System.Windows.Forms.TableLayoutPanel tableLayoutPanel5;
         private System.Windows.Forms.TextBox ProxyPortTextBox;
         private System.Windows.Forms.Label ProxyPortLabel;
+        private System.Windows.Forms.TableLayoutPanel tableLayoutPanel6;
+        private System.Windows.Forms.Button MoveDownButton;
+        private System.Windows.Forms.Button MoveUpButton;
     }
 }
 

shadowsocks-csharp/View/ConfigForm.cs

@@ -18,7 +18,7 @@ namespace Shadowsocks.View
 
         // this is a copy of configuration that we are working on
         private Configuration _modifiedConfiguration;
-        private int _oldSelectedIndex = -1;
+        private int _lastSelectedIndex = -1;
 
         public ConfigForm(ShadowsocksController controller)
         {
@@ -51,6 +51,8 @@ namespace Shadowsocks.View
             ServerGroupBox.Text = I18N.GetString("Server");
             OKButton.Text = I18N.GetString("OK");
             MyCancelButton.Text = I18N.GetString("Cancel");
+            MoveUpButton.Text = I18N.GetString("Move &Up");
+            MoveDownButton.Text = I18N.GetString("Move D&own");
             this.Text = I18N.GetString("Edit Servers");
         }
 
@@ -58,7 +60,7 @@ namespace Shadowsocks.View
         {
             LoadCurrentConfiguration();
         }
-        
+
         private void ShowWindow()
         {
             this.Opacity = 1;
@@ -70,7 +72,7 @@ namespace Shadowsocks.View
         {
             try
             {
-                if (_oldSelectedIndex == -1 || _oldSelectedIndex >= _modifiedConfiguration.configs.Count)
+                if (_lastSelectedIndex == -1 || _lastSelectedIndex >= _modifiedConfiguration.configs.Count)
                 {
                     return true;
                 }
@@ -84,10 +86,10 @@ namespace Shadowsocks.View
                 };
                 int localPort = int.Parse(ProxyPortTextBox.Text);
                 Configuration.CheckServer(server);
-                Configuration.CheckPort(localPort);
-                _modifiedConfiguration.configs[_oldSelectedIndex] = server;
+                Configuration.CheckLocalPort(localPort);
+                _modifiedConfiguration.configs[_lastSelectedIndex] = server;
                 _modifiedConfiguration.localPort = localPort;
-                
+
                 return true;
             }
             catch (FormatException)
@@ -113,12 +115,6 @@ namespace Shadowsocks.View
                 ProxyPortTextBox.Text = _modifiedConfiguration.localPort.ToString();
                 EncryptionSelect.Text = server.method ?? "aes-256-cfb";
                 RemarksTextBox.Text = server.remarks;
-                ServerGroupBox.Visible = true;
-                //IPTextBox.Focus();
-            }
-            else
-            {
-                ServerGroupBox.Visible = false;
             }
         }
 
@@ -133,10 +129,15 @@ namespace Shadowsocks.View
 
         private void LoadCurrentConfiguration()
         {
-            _modifiedConfiguration = controller.GetConfiguration();
+            _modifiedConfiguration = controller.GetConfigurationCopy();
             LoadConfiguration(_modifiedConfiguration);
-            _oldSelectedIndex = _modifiedConfiguration.index;
-            ServersListBox.SelectedIndex = _modifiedConfiguration.index;
+            _lastSelectedIndex = _modifiedConfiguration.index;
+            if (_lastSelectedIndex < 0)
+            {
+                _lastSelectedIndex = 0;
+            }
+            ServersListBox.SelectedIndex = _lastSelectedIndex;
+            UpdateMoveUpAndDownButton();
             LoadSelectedServer();
         }
 
@@ -147,7 +148,11 @@ namespace Shadowsocks.View
 
         private void ServersListBox_SelectedIndexChanged(object sender, EventArgs e)
         {
-            if (_oldSelectedIndex == ServersListBox.SelectedIndex)
+            if (!ServersListBox.CanSelect)
+            {
+                return;
+            }
+            if (_lastSelectedIndex == ServersListBox.SelectedIndex)
             {
                 // we are moving back to oldSelectedIndex or doing a force move
                 return;
@@ -155,11 +160,13 @@ namespace Shadowsocks.View
             if (!SaveOldSelectedServer())
             {
                 // why this won't cause stack overflow?
-                ServersListBox.SelectedIndex = _oldSelectedIndex;
+                ServersListBox.SelectedIndex = _lastSelectedIndex;
                 return;
             }
+            ServersListBox.Items[_lastSelectedIndex] = _modifiedConfiguration.configs[_lastSelectedIndex].FriendlyName();
+            UpdateMoveUpAndDownButton();
             LoadSelectedServer();
-            _oldSelectedIndex = ServersListBox.SelectedIndex;
+            _lastSelectedIndex = ServersListBox.SelectedIndex;
         }
 
         private void AddButton_Click(object sender, EventArgs e)
@@ -172,29 +179,30 @@ namespace Shadowsocks.View
             _modifiedConfiguration.configs.Add(server);
             LoadConfiguration(_modifiedConfiguration);
             ServersListBox.SelectedIndex = _modifiedConfiguration.configs.Count - 1;
-            _oldSelectedIndex = ServersListBox.SelectedIndex;
+            _lastSelectedIndex = ServersListBox.SelectedIndex;
         }
 
         private void DeleteButton_Click(object sender, EventArgs e)
         {
-            _oldSelectedIndex = ServersListBox.SelectedIndex;
-            if (_oldSelectedIndex >= 0 && _oldSelectedIndex < _modifiedConfiguration.configs.Count)
+            _lastSelectedIndex = ServersListBox.SelectedIndex;
+            if (_lastSelectedIndex >= 0 && _lastSelectedIndex < _modifiedConfiguration.configs.Count)
             {
-                _modifiedConfiguration.configs.RemoveAt(_oldSelectedIndex);
+                _modifiedConfiguration.configs.RemoveAt(_lastSelectedIndex);
             }
-            if (_oldSelectedIndex >= _modifiedConfiguration.configs.Count)
+            if (_lastSelectedIndex >= _modifiedConfiguration.configs.Count)
             {
                 // can be -1
-                _oldSelectedIndex = _modifiedConfiguration.configs.Count - 1;
+                _lastSelectedIndex = _modifiedConfiguration.configs.Count - 1;
             }
-            ServersListBox.SelectedIndex = _oldSelectedIndex;
+            ServersListBox.SelectedIndex = _lastSelectedIndex;
             LoadConfiguration(_modifiedConfiguration);
-            ServersListBox.SelectedIndex = _oldSelectedIndex;
+            ServersListBox.SelectedIndex = _lastSelectedIndex;
             LoadSelectedServer();
         }
 
         private void OKButton_Click(object sender, EventArgs e)
         {
+            Server server = controller.GetCurrentServer();
             if (!SaveOldSelectedServer())
             {
                 return;
@@ -205,6 +213,7 @@ namespace Shadowsocks.View
                 return;
             }
             controller.SaveServers(_modifiedConfiguration.configs, _modifiedConfiguration.localPort);
+            controller.SelectServerIndex(_modifiedConfiguration.configs.IndexOf(server));
             this.Close();
         }
 
@@ -223,5 +232,70 @@ namespace Shadowsocks.View
             controller.ConfigChanged -= controller_ConfigChanged;
         }
 
+        private void MoveConfigItem(int step)
+        {
+            int index = ServersListBox.SelectedIndex;
+            Server server = _modifiedConfiguration.configs[index];
+            object item = ServersListBox.SelectedItem;
+
+            _modifiedConfiguration.configs.Remove(server);
+            _modifiedConfiguration.configs.Insert(index + step, server);
+            _modifiedConfiguration.index += step;
+
+            ServersListBox.BeginUpdate();
+            ServersListBox.Enabled = false;
+            _lastSelectedIndex = index + step;
+            ServersListBox.Items.Remove(item);
+            ServersListBox.Items.Insert(index + step, item);
+            ServersListBox.Enabled = true;
+            ServersListBox.SelectedIndex = index + step;
+            ServersListBox.EndUpdate();
+
+            UpdateMoveUpAndDownButton();
+        }
+
+        private void UpdateMoveUpAndDownButton()
+        {
+            if (ServersListBox.SelectedIndex == 0)
+            {
+                MoveUpButton.Enabled = false;
+            }
+            else
+            {
+                MoveUpButton.Enabled = true;
+            }
+            if (ServersListBox.SelectedIndex == ServersListBox.Items.Count - 1)
+            {
+                MoveDownButton.Enabled = false;
+            }
+            else
+            {
+                MoveDownButton.Enabled = true;
+            }
+        }
+
+        private void MoveUpButton_Click(object sender, EventArgs e)
+        {
+            if (!SaveOldSelectedServer())
+            {
+                return;
+            }
+            if (ServersListBox.SelectedIndex > 0)
+            {
+                MoveConfigItem(-1);  // -1 means move backward
+            }
+        }
+
+        private void MoveDownButton_Click(object sender, EventArgs e)
+        {
+            if (!SaveOldSelectedServer())
+            {
+                return;
+            }
+            if (ServersListBox.SelectedIndex < ServersListBox.Items.Count - 1)
+            {
+                MoveConfigItem(+1);  // +1 means move forward
+            }
+        }
     }
 }

shadowsocks-csharp/View/ConfigForm.resx

@@ -112,9 +112,9 @@
     <value>2.0</value>
   </resheader>
   <resheader name="reader">
-    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
   <resheader name="writer">
-    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
 </root>

shadowsocks-csharp/View/LogForm.Designer.cs

@@ -0,0 +1,199 @@
+namespace Shadowsocks.View
+{
+    partial class LogForm
+    {
+        /// <summary>
+        /// Required designer variable.
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary>
+        /// Clean up any resources being used.
+        /// </summary>
+        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Windows Form Designer generated code
+
+        /// <summary>
+        /// Required method for Designer support - do not modify
+        /// the contents of this method with the code editor.
+        /// </summary>
+        private void InitializeComponent()
+        {
+            this.components = new System.ComponentModel.Container();
+            this.LogMessageTextBox = new System.Windows.Forms.TextBox();
+            this.contextMenuStrip1 = new System.Windows.Forms.ContextMenuStrip(this.components);
+            this.mainMenu1 = new System.Windows.Forms.MainMenu(this.components);
+            this.FileMenuItem = new System.Windows.Forms.MenuItem();
+            this.OpenLocationMenuItem = new System.Windows.Forms.MenuItem();
+            this.ExitMenuItem = new System.Windows.Forms.MenuItem();
+            this.panel1 = new System.Windows.Forms.Panel();
+            this.ChangeFontButton = new System.Windows.Forms.Button();
+            this.CleanLogsButton = new System.Windows.Forms.Button();
+            this.WrapTextCheckBox = new System.Windows.Forms.CheckBox();
+            this.tableLayoutPanel1 = new System.Windows.Forms.TableLayoutPanel();
+            this.TopMostCheckBox = new System.Windows.Forms.CheckBox();
+            this.panel1.SuspendLayout();
+            this.tableLayoutPanel1.SuspendLayout();
+            this.SuspendLayout();
+            // 
+            // LogMessageTextBox
+            // 
+            this.LogMessageTextBox.BackColor = System.Drawing.Color.Black;
+            this.LogMessageTextBox.Dock = System.Windows.Forms.DockStyle.Fill;
+            this.LogMessageTextBox.Font = new System.Drawing.Font("Consolas", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
+            this.LogMessageTextBox.ForeColor = System.Drawing.Color.White;
+            this.LogMessageTextBox.Location = new System.Drawing.Point(3, 43);
+            this.LogMessageTextBox.MaxLength = 2147483647;
+            this.LogMessageTextBox.Multiline = true;
+            this.LogMessageTextBox.Name = "LogMessageTextBox";
+            this.LogMessageTextBox.ReadOnly = true;
+            this.LogMessageTextBox.ScrollBars = System.Windows.Forms.ScrollBars.Both;
+            this.LogMessageTextBox.Size = new System.Drawing.Size(541, 307);
+            this.LogMessageTextBox.TabIndex = 0;
+            this.LogMessageTextBox.WordWrap = false;
+            // 
+            // contextMenuStrip1
+            // 
+            this.contextMenuStrip1.Name = "contextMenuStrip1";
+            this.contextMenuStrip1.Size = new System.Drawing.Size(61, 4);
+            // 
+            // mainMenu1
+            // 
+            this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
+            this.FileMenuItem});
+            // 
+            // FileMenuItem
+            // 
+            this.FileMenuItem.Index = 0;
+            this.FileMenuItem.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
+            this.OpenLocationMenuItem,
+            this.ExitMenuItem});
+            this.FileMenuItem.Text = "&File";
+            // 
+            // OpenLocationMenuItem
+            // 
+            this.OpenLocationMenuItem.Index = 0;
+            this.OpenLocationMenuItem.Text = "&Open Location";
+            this.OpenLocationMenuItem.Click += new System.EventHandler(this.OpenLocationMenuItem_Click);
+            // 
+            // ExitMenuItem
+            // 
+            this.ExitMenuItem.Index = 1;
+            this.ExitMenuItem.Text = "E&xit";
+            this.ExitMenuItem.Click += new System.EventHandler(this.ExitMenuItem_Click);
+            // 
+            // panel1
+            // 
+            this.panel1.Controls.Add(this.TopMostCheckBox);
+            this.panel1.Controls.Add(this.ChangeFontButton);
+            this.panel1.Controls.Add(this.CleanLogsButton);
+            this.panel1.Controls.Add(this.WrapTextCheckBox);
+            this.panel1.Dock = System.Windows.Forms.DockStyle.Fill;
+            this.panel1.Location = new System.Drawing.Point(3, 3);
+            this.panel1.Name = "panel1";
+            this.panel1.Size = new System.Drawing.Size(541, 34);
+            this.panel1.TabIndex = 1;
+            // 
+            // ChangeFontButton
+            // 
+            this.ChangeFontButton.Location = new System.Drawing.Point(107, 4);
+            this.ChangeFontButton.Name = "ChangeFontButton";
+            this.ChangeFontButton.Size = new System.Drawing.Size(75, 23);
+            this.ChangeFontButton.TabIndex = 2;
+            this.ChangeFontButton.Text = "&Font";
+            this.ChangeFontButton.UseVisualStyleBackColor = true;
+            this.ChangeFontButton.Click += new System.EventHandler(this.ChangeFontButton_Click);
+            // 
+            // CleanLogsButton
+            // 
+            this.CleanLogsButton.Location = new System.Drawing.Point(9, 4);
+            this.CleanLogsButton.Name = "CleanLogsButton";
+            this.CleanLogsButton.Size = new System.Drawing.Size(75, 23);
+            this.CleanLogsButton.TabIndex = 1;
+            this.CleanLogsButton.Text = "&Clean logs";
+            this.CleanLogsButton.UseVisualStyleBackColor = true;
+            this.CleanLogsButton.Click += new System.EventHandler(this.CleanLogsButton_Click);
+            // 
+            // WrapTextCheckBox
+            // 
+            this.WrapTextCheckBox.AutoSize = true;
+            this.WrapTextCheckBox.Location = new System.Drawing.Point(209, 9);
+            this.WrapTextCheckBox.Name = "WrapTextCheckBox";
+            this.WrapTextCheckBox.Size = new System.Drawing.Size(78, 16);
+            this.WrapTextCheckBox.TabIndex = 0;
+            this.WrapTextCheckBox.Text = "&Wrap text";
+            this.WrapTextCheckBox.UseVisualStyleBackColor = true;
+            this.WrapTextCheckBox.CheckedChanged += new System.EventHandler(this.WrapTextCheckBox_CheckedChanged);
+            // 
+            // tableLayoutPanel1
+            // 
+            this.tableLayoutPanel1.ColumnCount = 1;
+            this.tableLayoutPanel1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 100F));
+            this.tableLayoutPanel1.Controls.Add(this.panel1, 0, 0);
+            this.tableLayoutPanel1.Controls.Add(this.LogMessageTextBox, 0, 1);
+            this.tableLayoutPanel1.Dock = System.Windows.Forms.DockStyle.Fill;
+            this.tableLayoutPanel1.Location = new System.Drawing.Point(0, 0);
+            this.tableLayoutPanel1.Name = "tableLayoutPanel1";
+            this.tableLayoutPanel1.RowCount = 2;
+            this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Absolute, 40F));
+            this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle());
+            this.tableLayoutPanel1.Size = new System.Drawing.Size(547, 353);
+            this.tableLayoutPanel1.TabIndex = 2;
+            // 
+            // TopMostCheckBox
+            // 
+            this.TopMostCheckBox.AutoSize = true;
+            this.TopMostCheckBox.Location = new System.Drawing.Point(311, 9);
+            this.TopMostCheckBox.Name = "TopMostCheckBox";
+            this.TopMostCheckBox.Size = new System.Drawing.Size(72, 16);
+            this.TopMostCheckBox.TabIndex = 3;
+            this.TopMostCheckBox.Text = "&Top most";
+            this.TopMostCheckBox.UseVisualStyleBackColor = true;
+            this.TopMostCheckBox.CheckedChanged += new System.EventHandler(this.TopMostCheckBox_CheckedChanged);
+            // 
+            // LogForm
+            // 
+            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
+            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+            this.ClientSize = new System.Drawing.Size(547, 353);
+            this.Controls.Add(this.tableLayoutPanel1);
+            this.Menu = this.mainMenu1;
+            this.Name = "LogForm";
+            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
+            this.Text = "Log Viewer";
+            this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.LogForm_FormClosing);
+            this.Load += new System.EventHandler(this.LogForm_Load);
+            this.Shown += new System.EventHandler(this.LogForm_Shown);
+            this.panel1.ResumeLayout(false);
+            this.panel1.PerformLayout();
+            this.tableLayoutPanel1.ResumeLayout(false);
+            this.tableLayoutPanel1.PerformLayout();
+            this.ResumeLayout(false);
+
+        }
+
+        #endregion
+
+        private System.Windows.Forms.TextBox LogMessageTextBox;
+        private System.Windows.Forms.ContextMenuStrip contextMenuStrip1;
+        private System.Windows.Forms.MainMenu mainMenu1;
+        private System.Windows.Forms.MenuItem FileMenuItem;
+        private System.Windows.Forms.MenuItem OpenLocationMenuItem;
+        private System.Windows.Forms.MenuItem ExitMenuItem;
+        private System.Windows.Forms.Panel panel1;
+        private System.Windows.Forms.CheckBox WrapTextCheckBox;
+        private System.Windows.Forms.Button CleanLogsButton;
+        private System.Windows.Forms.Button ChangeFontButton;
+        private System.Windows.Forms.TableLayoutPanel tableLayoutPanel1;
+        private System.Windows.Forms.CheckBox TopMostCheckBox;
+    }
+}

shadowsocks-csharp/View/LogForm.cs

@@ -0,0 +1,150 @@
+using Shadowsocks.Controller;
+using Shadowsocks.Properties;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Windows.Forms;
+
+namespace Shadowsocks.View
+{
+    public partial class LogForm : Form
+    {
+        long lastOffset;
+        string filename;
+        Timer timer;
+        const int BACK_OFFSET = 65536;
+
+        public LogForm(string filename)
+        {
+            this.filename = filename;
+            InitializeComponent();
+            this.Icon = Icon.FromHandle(Resources.ssw128.GetHicon());
+
+            UpdateTexts();
+        }
+
+        private void UpdateTexts()
+        {
+            FileMenuItem.Text = I18N.GetString("&File");
+            OpenLocationMenuItem.Text = I18N.GetString("&Open Location");
+            ExitMenuItem.Text = I18N.GetString("E&xit");
+            CleanLogsButton.Text = I18N.GetString("&Clean logs");
+            ChangeFontButton.Text = I18N.GetString("&Font");
+            WrapTextCheckBox.Text = I18N.GetString("&Wrap text");
+            TopMostCheckBox.Text = I18N.GetString("&Top most");
+            this.Text = I18N.GetString("Log Viewer");
+        }
+
+        private void Timer_Tick(object sender, EventArgs e)
+        {
+            UpdateContent();
+        }
+
+        private void InitContent()
+        {
+            using (StreamReader reader = new StreamReader(new FileStream(filename,
+                     FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
+            {
+                if (reader.BaseStream.Length > BACK_OFFSET)
+                {
+                    reader.BaseStream.Seek(-BACK_OFFSET, SeekOrigin.End);
+                    reader.ReadLine();
+                }
+
+                string line = "";
+                while ((line = reader.ReadLine()) != null)
+                    LogMessageTextBox.AppendText(line + "\r\n");
+
+                LogMessageTextBox.ScrollToCaret();
+
+                lastOffset = reader.BaseStream.Position;
+            }
+        }
+
+        private void UpdateContent()
+        {
+            using (StreamReader reader = new StreamReader(new FileStream(filename,
+                     FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
+            {
+                reader.BaseStream.Seek(lastOffset, SeekOrigin.Begin);
+
+                string line = "";
+                bool changed = false;
+                while ((line = reader.ReadLine()) != null)
+                {
+                    changed = true;
+                    LogMessageTextBox.AppendText(line + "\r\n");
+                }
+
+                if (changed)
+                {
+                    LogMessageTextBox.ScrollToCaret();
+                }
+
+                lastOffset = reader.BaseStream.Position;
+            }
+        }
+
+        private void LogForm_Load(object sender, EventArgs e)
+        {
+            InitContent();
+            timer = new Timer();
+            timer.Interval = 300;
+            timer.Tick += Timer_Tick;
+            timer.Start();
+        }
+
+        private void LogForm_FormClosing(object sender, FormClosingEventArgs e)
+        {
+            timer.Stop();
+        }
+
+        private void OpenLocationMenuItem_Click(object sender, EventArgs e)
+        {
+            string argument = "/select, \"" + filename + "\"";
+            Console.WriteLine(argument);
+            System.Diagnostics.Process.Start("explorer.exe", argument);
+        }
+
+        private void ExitMenuItem_Click(object sender, EventArgs e)
+        {
+            this.Close();
+        }
+
+        private void LogForm_Shown(object sender, EventArgs e)
+        {
+            LogMessageTextBox.ScrollToCaret();
+        }
+
+        private void WrapTextCheckBox_CheckedChanged(object sender, EventArgs e)
+        {
+            LogMessageTextBox.WordWrap = WrapTextCheckBox.Checked;
+            LogMessageTextBox.ScrollToCaret();
+        }
+
+        private void CleanLogsButton_Click(object sender, EventArgs e)
+        {
+            LogMessageTextBox.Clear();
+        }
+
+        private void ChangeFontButton_Click(object sender, EventArgs e)
+        {
+            FontDialog fd = new FontDialog();
+            fd.Font = LogMessageTextBox.Font;
+            if (fd.ShowDialog() == DialogResult.OK)
+            {
+                LogMessageTextBox.Font = fd.Font;
+            }
+        }
+
+        private void TopMostCheckBox_CheckedChanged(object sender, EventArgs e)
+        {
+            this.TopMost = TopMostCheckBox.Checked;
+        }
+    }
+}

shadowsocks-csharp/View/LogForm.resx

@@ -0,0 +1,126 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <metadata name="contextMenuStrip1.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>17, 17</value>
+  </metadata>
+  <metadata name="mainMenu1.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>172, 17</value>
+  </metadata>
+</root>

shadowsocks-csharp/View/MenuViewController.cs

@@ -18,7 +18,7 @@ namespace Shadowsocks.View
         // yes this is just a menu view controller
         // when config form is closed, it moves away from RAM
         // and it should just do anything related to the config form
-        
+
         private ShadowsocksController controller;
         private UpdateChecker updateChecker;
 
@@ -29,6 +29,7 @@ namespace Shadowsocks.View
         private MenuItem enableItem;
         private MenuItem modeItem;
         private MenuItem AutoStartupItem;
+        private MenuItem AvailabilityStatistics;
         private MenuItem ShareOverLANItem;
         private MenuItem SeperatorItem;
         private MenuItem ConfigItem;
@@ -71,9 +72,9 @@ namespace Shadowsocks.View
 
             LoadCurrentConfiguration();
 
-            updateChecker.CheckUpdate(controller.GetConfiguration());
+            updateChecker.CheckUpdate(controller.GetConfigurationCopy());
 
-            if (controller.GetConfiguration().isDefault)
+            if (controller.GetConfigurationCopy().isDefault)
             {
                 _isFirstRun = true;
                 ShowConfigForm();
@@ -106,7 +107,7 @@ namespace Shadowsocks.View
             {
                 icon = Resources.ss24;
             }
-            Configuration config = controller.GetConfiguration();
+            Configuration config = controller.GetConfigurationCopy();
             bool enabled = config.enabled;
             bool global = config.global;
             if (!enabled)
@@ -124,12 +125,21 @@ namespace Shadowsocks.View
             }
             _notifyIcon.Icon = Icon.FromHandle(icon.GetHicon());
 
+            string serverInfo = null;
+            if (controller.GetCurrentStrategy() != null)
+            {
+                serverInfo = controller.GetCurrentStrategy().Name;
+            }
+            else
+            {
+                serverInfo = config.GetCurrentServer().FriendlyName();
+            }
             // we want to show more details but notify icon title is limited to 63 characters
             string text = I18N.GetString("Shadowsocks") + " " + UpdateChecker.Version + "\n" +
                 (enabled ?
                     I18N.GetString("System Proxy On: ") + (global ? I18N.GetString("Global") : I18N.GetString("PAC")) :
                     String.Format(I18N.GetString("Running: Port {0}"), config.localPort))  // this feedback is very important because they need to know Shadowsocks is running
-                + "\n" + config.GetCurrentServer().FriendlyName();
+                + "\n" + serverInfo;
             _notifyIcon.Text = text.Substring(0, Math.Min(63, text.Length));
         }
 
@@ -168,6 +178,7 @@ namespace Shadowsocks.View
                 }),
                 new MenuItem("-"),
                 this.AutoStartupItem = CreateMenuItem("Start on Boot", new EventHandler(this.AutoStartupItem_Click)),
+                this.AvailabilityStatistics = CreateMenuItem("Availability Statistics", new EventHandler(this.AvailabilityStatisticsItem_Click)),
                 this.ShareOverLANItem = CreateMenuItem("Allow Clients from LAN", new EventHandler(this.ShareOverLANItem_Click)),
                 new MenuItem("-"),
                 CreateMenuItem("Show Logs...", new EventHandler(this.ShowLogItem_Click)),
@@ -185,18 +196,18 @@ namespace Shadowsocks.View
 
         private void controller_EnableStatusChanged(object sender, EventArgs e)
         {
-            enableItem.Checked = controller.GetConfiguration().enabled;
+            enableItem.Checked = controller.GetConfigurationCopy().enabled;
             modeItem.Enabled = enableItem.Checked;
         }
 
         void controller_ShareOverLANStatusChanged(object sender, EventArgs e)
         {
-            ShareOverLANItem.Checked = controller.GetConfiguration().shareOverLan;
+            ShareOverLANItem.Checked = controller.GetConfigurationCopy().shareOverLan;
         }
 
         void controller_EnableGlobalChanged(object sender, EventArgs e)
         {
-            globalModeItem.Checked = controller.GetConfiguration().global;
+            globalModeItem.Checked = controller.GetConfigurationCopy().global;
             PACModeItem.Checked = !globalModeItem.Checked;
         }
 
@@ -243,7 +254,7 @@ namespace Shadowsocks.View
 
         private void LoadCurrentConfiguration()
         {
-            Configuration config = controller.GetConfiguration();
+            Configuration config = controller.GetConfigurationCopy();
             UpdateServersMenu();
             enableItem.Checked = config.enabled;
             modeItem.Enabled = config.enabled;
@@ -251,6 +262,7 @@ namespace Shadowsocks.View
             PACModeItem.Checked = !config.global;
             ShareOverLANItem.Checked = config.shareOverLan;
             AutoStartupItem.Checked = AutoStartup.Check();
+            AvailabilityStatistics.Checked = config.availabilityStatistics;
             onlinePACItem.Checked = onlinePACItem.Enabled && config.useOnlinePac;
             localPACItem.Checked = !onlinePACItem.Checked;
             UpdatePACItemsEnabledStatus();
@@ -263,20 +275,33 @@ namespace Shadowsocks.View
             {
                 items.RemoveAt(0);
             }
-
-            Configuration configuration = controller.GetConfiguration();
-            for (int i = 0; i < configuration.configs.Count; i++)
+            int i = 0;
+            foreach (var strategy in controller.GetStrategies())
+            {
+                MenuItem item = new MenuItem(strategy.Name);
+                item.Tag = strategy.ID;
+                item.Click += AStrategyItem_Click;
+                items.Add(i, item);
+                i++;
+            }
+            int strategyCount = i;
+            Configuration configuration = controller.GetConfigurationCopy();
+            foreach (var server in configuration.configs)
             {
-                Server server = configuration.configs[i];
                 MenuItem item = new MenuItem(server.FriendlyName());
-                item.Tag = i;
+                item.Tag = i - strategyCount;
                 item.Click += AServerItem_Click;
                 items.Add(i, item);
+                i++;
             }
 
-            if (configuration.index >= 0 && configuration.index < configuration.configs.Count)
+            foreach (MenuItem item in items)
             {
-                items[configuration.index].Checked = true;
+                if (item.Tag != null && (item.Tag.ToString() == configuration.index.ToString() || item.Tag.ToString() == configuration.strategy))
+                {
+                    item.Checked = true;
+                }
+
             }
         }
 
@@ -297,7 +322,7 @@ namespace Shadowsocks.View
         void configForm_FormClosed(object sender, FormClosedEventArgs e)
         {
             configForm = null;
-            Util.Utils.ReleaseMemory();
+            Util.Utils.ReleaseMemory(true);
             ShowFirstTimeBalloon();
         }
 
@@ -327,7 +352,7 @@ namespace Shadowsocks.View
 
         private void AboutItem_Click(object sender, EventArgs e)
         {
-            Process.Start("https://github.com/shadowsocks/shadowsocks-csharp");
+            Process.Start("https://github.com/shadowsocks/shadowsocks-windows");
         }
 
         private void notifyIcon1_DoubleClick(object sender, MouseEventArgs e)
@@ -380,11 +405,17 @@ namespace Shadowsocks.View
             controller.SelectServerIndex((int)item.Tag);
         }
 
+        private void AStrategyItem_Click(object sender, EventArgs e)
+        {
+            MenuItem item = (MenuItem)sender;
+            controller.SelectStrategy((string)item.Tag);
+        }
+
         private void ShowLogItem_Click(object sender, EventArgs e)
         {
             string argument = Logging.LogFile;
 
-            System.Diagnostics.Process.Start("notepad.exe", argument);
+            new LogForm(argument).Show();
         }
 
         private void QRCodeItem_Click(object sender, EventArgs e)
@@ -489,12 +520,17 @@ namespace Shadowsocks.View
             Process.Start(_urlToOpen);
         }
 
-		private void AutoStartupItem_Click(object sender, EventArgs e) {
-			AutoStartupItem.Checked = !AutoStartupItem.Checked;
-			if (!AutoStartup.Set(AutoStartupItem.Checked)) {
-				MessageBox.Show(I18N.GetString("Failed to update registry"));
-			}
-		}
+        private void AutoStartupItem_Click(object sender, EventArgs e) {
+            AutoStartupItem.Checked = !AutoStartupItem.Checked;
+            if (!AutoStartup.Set(AutoStartupItem.Checked)) {
+                MessageBox.Show(I18N.GetString("Failed to update registry"));
+            }
+        }
+
+        private void AvailabilityStatisticsItem_Click(object sender, EventArgs e) {
+            AvailabilityStatistics.Checked = !AvailabilityStatistics.Checked;
+            controller.ToggleAvailabilityStatistics(AvailabilityStatistics.Checked);
+        }
 
         private void LocalPACItem_Click(object sender, EventArgs e)
         {
@@ -511,11 +547,11 @@ namespace Shadowsocks.View
         {
             if (!onlinePACItem.Checked)
             {
-                if (String.IsNullOrEmpty(controller.GetConfiguration().pacUrl))
+                if (String.IsNullOrEmpty(controller.GetConfigurationCopy().pacUrl))
                 {
                     UpdateOnlinePACURLItem_Click(sender, e);
                 }
-                if (!String.IsNullOrEmpty(controller.GetConfiguration().pacUrl))
+                if (!String.IsNullOrEmpty(controller.GetConfigurationCopy().pacUrl))
                 {
                     localPACItem.Checked = false;
                     onlinePACItem.Checked = true;
@@ -527,7 +563,7 @@ namespace Shadowsocks.View
 
         private void UpdateOnlinePACURLItem_Click(object sender, EventArgs e)
         {
-            string origPacUrl = controller.GetConfiguration().pacUrl;
+            string origPacUrl = controller.GetConfigurationCopy().pacUrl;
             string pacUrl = Microsoft.VisualBasic.Interaction.InputBox(
                 I18N.GetString("Please input PAC Url"),
                 I18N.GetString("Edit Online PAC URL"),

shadowsocks-csharp/View/QRCodeForm.Designer.cs

@@ -29,6 +29,7 @@
         private void InitializeComponent()
         {
             this.pictureBox1 = new System.Windows.Forms.PictureBox();
+            this.listBox1 = new System.Windows.Forms.ListBox();
             ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
             this.SuspendLayout();
             // 
@@ -42,6 +43,19 @@
             this.pictureBox1.TabIndex = 1;
             this.pictureBox1.TabStop = false;
             // 
+            // listBox1
+            // 
+            this.listBox1.DisplayMember = "Value";
+            this.listBox1.FormattingEnabled = true;
+            this.listBox1.ItemHeight = 12;
+            this.listBox1.Location = new System.Drawing.Point(224, 10);
+            this.listBox1.Name = "listBox1";
+            this.listBox1.ScrollAlwaysVisible = true;
+            this.listBox1.Size = new System.Drawing.Size(227, 208);
+            this.listBox1.TabIndex = 2;
+            this.listBox1.ValueMember = "Key";
+            this.listBox1.SelectedIndexChanged += new System.EventHandler(this.listBox1_SelectedIndexChanged);
+            // 
             // QRCodeForm
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(96F, 96F);
@@ -49,7 +63,8 @@
             this.AutoSize = true;
             this.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink;
             this.BackColor = System.Drawing.Color.White;
-            this.ClientSize = new System.Drawing.Size(338, 274);
+            this.ClientSize = new System.Drawing.Size(457, 228);
+            this.Controls.Add(this.listBox1);
             this.Controls.Add(this.pictureBox1);
             this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
             this.MaximizeBox = false;
@@ -67,5 +82,6 @@
         #endregion
 
         private System.Windows.Forms.PictureBox pictureBox1;
+        private System.Windows.Forms.ListBox listBox1;
     }
 }

shadowsocks-csharp/View/QRCodeForm.cs

@@ -8,8 +8,10 @@ using System.Data;
 using System.Drawing;
 using System.IO;
 using System.IO.Compression;
+using System.Linq;
 using System.Text;
 using System.Windows.Forms;
+using Shadowsocks.Model;
 
 namespace Shadowsocks.View
 {
@@ -30,8 +32,8 @@ namespace Shadowsocks.View
             string qrText = ssconfig;
             QRCode code = ZXing.QrCode.Internal.Encoder.encode(qrText, ErrorCorrectionLevel.M);
             ByteMatrix m = code.Matrix;
-            int blockSize = Math.Max(pictureBox1.Height / m.Height, 1);
-            Bitmap drawArea = new Bitmap((m.Width * blockSize), (m.Height * blockSize));
+            int blockSize = Math.Max(pictureBox1.Height/m.Height, 1);
+            Bitmap drawArea = new Bitmap((m.Width*blockSize), (m.Height*blockSize));
             using (Graphics g = Graphics.FromImage(drawArea))
             {
                 g.Clear(Color.White);
@@ -43,7 +45,7 @@ namespace Shadowsocks.View
                         {
                             if (m[row, col] != 0)
                             {
-                                g.FillRectangle(b, blockSize * row, blockSize * col, blockSize, blockSize);
+                                g.FillRectangle(b, blockSize*row, blockSize*col, blockSize, blockSize);
                             }
                         }
                     }
@@ -54,7 +56,20 @@ namespace Shadowsocks.View
 
         private void QRCodeForm_Load(object sender, EventArgs e)
         {
-            GenQR(code);
+            var servers = Configuration.Load();
+            var serverDatas = servers.configs.Select(
+                server =>
+                    new KeyValuePair<string, string>(ShadowsocksController.GetQRCode(server), server.FriendlyName())
+                ).ToList();
+            listBox1.DataSource = serverDatas;
+
+            var selectIndex = serverDatas.FindIndex(serverData => serverData.Key.StartsWith(code));
+            if (selectIndex >= 0) listBox1.SetSelected(selectIndex, true);
+        }
+
+        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
+        {
+            GenQR((sender as ListBox)?.SelectedValue.ToString());
         }
     }
 }

shadowsocks-csharp/View/QRCodeForm.resx

@@ -112,9 +112,9 @@
     <value>2.0</value>
   </resheader>
   <resheader name="reader">
-    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
   <resheader name="writer">
-    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
 </root>

shadowsocks-csharp/View/QRCodeSplashForm.cs

@@ -242,7 +242,6 @@ namespace Shadowsocks.View
             SetBitmap(bitmap, 255);
         }
 
-
         /// <para>Changes the current bitmap with a custom opacity level.  Here is where all happens!</para>
         public void SetBitmap(Bitmap bitmap, byte opacity)
         {
@@ -288,7 +287,6 @@ namespace Shadowsocks.View
             }
         }
 
-
         protected override CreateParams CreateParams
         {
             get

shadowsocks-csharp/shadowsocks-csharp.csproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
@@ -10,7 +10,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>Shadowsocks</RootNamespace>
     <AssemblyName>Shadowsocks</AssemblyName>
-    <TargetFrameworkVersion>v2.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <StartupObject>
     </StartupObject>
@@ -21,8 +21,7 @@
     <UpgradeBackupLocation>
     </UpgradeBackupLocation>
     <OldToolsVersion>3.5</OldToolsVersion>
-    <TargetFrameworkProfile>
-    </TargetFrameworkProfile>
+    <TargetFrameworkProfile>Client</TargetFrameworkProfile>
     <PublishUrl>publish\</PublishUrl>
     <Install>true</Install>
     <InstallFrom>Disk</InstallFrom>
@@ -124,15 +123,18 @@
     <Compile Include="3rd\zxing\ResultPoint.cs" />
     <Compile Include="3rd\zxing\ResultPointCallback.cs" />
     <Compile Include="3rd\zxing\WriterException.cs" />
-    <Compile Include="Controller\AutoStartup.cs" />
+    <Compile Include="Controller\Service\AvailabilityStatistics.cs" />
+    <Compile Include="Controller\Strategy\HighAvailabilityStrategy.cs" />
+    <Compile Include="Controller\Strategy\SimplyChooseByStatisticsStrategy.cs" />
+    <Compile Include="Controller\System\AutoStartup.cs" />
     <Compile Include="Controller\FileManager.cs" />
-    <Compile Include="Controller\GFWListUpdater.cs" />
+    <Compile Include="Controller\Service\GFWListUpdater.cs" />
     <Compile Include="Controller\I18N.cs" />
-    <Compile Include="Controller\Listener.cs" />
+    <Compile Include="Controller\Service\Listener.cs" />
     <Compile Include="Controller\Logging.cs" />
-    <Compile Include="Controller\PortForwarder.cs" />
-    <Compile Include="Controller\UDPRelay.cs" />
-    <Compile Include="Controller\UpdateChecker.cs" />
+    <Compile Include="Controller\Service\PortForwarder.cs" />
+    <Compile Include="Controller\Service\UDPRelay.cs" />
+    <Compile Include="Controller\Service\UpdateChecker.cs" />
     <Compile Include="Encryption\EncryptorBase.cs" />
     <Compile Include="Encryption\EncryptorFactory.cs" />
     <Compile Include="Encryption\IVEncryptor.cs" />
@@ -142,7 +144,7 @@
     <Compile Include="Encryption\SodiumEncryptor.cs" />
     <Compile Include="Encryption\TableEncryptor.cs" />
     <Compile Include="Encryption\IEncryptor.cs" />
-    <Compile Include="Controller\PACServer.cs" />
+    <Compile Include="Controller\Service\PACServer.cs" />
     <Compile Include="Model\Server.cs" />
     <Compile Include="Model\Configuration.cs" />
     <Compile Include="Properties\Resources.Designer.cs">
@@ -150,6 +152,9 @@
       <DesignTime>True</DesignTime>
       <DependentUpon>Resources.resx</DependentUpon>
     </Compile>
+    <Compile Include="Controller\Strategy\BalancingStrategy.cs" />
+    <Compile Include="Controller\Strategy\StrategyManager.cs" />
+    <Compile Include="Controller\Strategy\IStrategy.cs" />
     <Compile Include="Util\Util.cs" />
     <Compile Include="View\ConfigForm.cs">
       <SubType>Form</SubType>
@@ -157,12 +162,18 @@
     <Compile Include="View\ConfigForm.Designer.cs">
       <DependentUpon>ConfigForm.cs</DependentUpon>
     </Compile>
-    <Compile Include="Controller\TCPRelay.cs" />
-    <Compile Include="Controller\PolipoRunner.cs" />
+    <Compile Include="Controller\Service\TCPRelay.cs" />
+    <Compile Include="Controller\Service\PolipoRunner.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Controller\ShadowsocksController.cs" />
-    <Compile Include="Controller\SystemProxy.cs" />
+    <Compile Include="Controller\System\SystemProxy.cs" />
+    <Compile Include="View\LogForm.cs">
+      <SubType>Form</SubType>
+    </Compile>
+    <Compile Include="View\LogForm.Designer.cs">
+      <DependentUpon>LogForm.cs</DependentUpon>
+    </Compile>
     <Compile Include="View\MenuViewController.cs" />
     <Compile Include="View\QRCodeForm.cs">
       <SubType>Form</SubType>
@@ -182,6 +193,9 @@
       <SubType>Designer</SubType>
       <LastGenOutput>Resources.Designer.cs</LastGenOutput>
     </EmbeddedResource>
+    <EmbeddedResource Include="View\LogForm.resx">
+      <DependentUpon>LogForm.cs</DependentUpon>
+    </EmbeddedResource>
     <EmbeddedResource Include="View\QRCodeForm.resx">
       <DependentUpon>QRCodeForm.cs</DependentUpon>
     </EmbeddedResource>
@@ -191,7 +205,8 @@
     </None>
     <None Include="Data\abp.js.gz" />
     <None Include="Data\libsscrypto.dll.gz" />
-    <None Include="Data\polipo.exe.gz" />
+    <None Include="Data\mgwz.dll.gz" />
+    <None Include="Data\privoxy.exe.gz" />
     <None Include="Data\proxy.pac.txt.gz" />
   </ItemGroup>
   <ItemGroup>
@@ -200,9 +215,9 @@
     <None Include="Resources\ss24.png" />
     <None Include="Resources\ssw128.png" />
     <Content Include="Data\cn.txt" />
+    <Content Include="Data\privoxy_conf.txt" />
     <Content Include="Data\user-rule.txt" />
     <Content Include="shadowsocks.ico" />
-    <None Include="Data\polipo_config.txt" />
   </ItemGroup>
   <ItemGroup>
     <BootstrapperPackage Include="Microsoft.Net.Client.3.5">