add pac server

shadowsocks-csharp/Encrypt/OpensslEncryptor.cs

@@ -149,13 +149,13 @@ namespace shadowsocks_csharp.Encrypt
 
                 }
 
-                if (_encryptCtx != IntPtr.Zero)
+                if (_encryptCtx.ToInt64() != 0)
                 {
                     OpenSSL.EVP_CIPHER_CTX_cleanup(_encryptCtx);
                     OpenSSL.EVP_CIPHER_CTX_free(_encryptCtx);
                     _encryptCtx = IntPtr.Zero;
-                }
-                if (_decryptCtx != IntPtr.Zero)
+                }
+                if (_decryptCtx.ToInt64() != 0)
                 {
                     OpenSSL.EVP_CIPHER_CTX_cleanup(_decryptCtx);
                     OpenSSL.EVP_CIPHER_CTX_free(_decryptCtx);

shadowsocks-csharp/Form1.cs

@@ -11,6 +11,7 @@ namespace shadowsocks_csharp
     public partial class Form1 : Form
     {
         Local local;
+        PACServer pacServer;
         Config config;
 
         public Form1()
@@ -45,6 +46,8 @@ namespace shadowsocks_csharp
                     this.Hide();
                 }));
             }
+            pacServer = new PACServer();
+            pacServer.Start();
         }
 
         private void reload(Config config)

shadowsocks-csharp/Local.cs

@@ -144,7 +144,17 @@ namespace shadowsocks_csharp
 
         public void Close()
         {
-            connection.Shutdown(SocketShutdown.Send);
+            if (connection != null)
+            {
+                try
+                {
+                    connection.Shutdown(SocketShutdown.Send);
+                }
+                catch (Exception e)
+                {
+                    Console.WriteLine(e.ToString());
+                }
+            }
             if (remote != null)
             {
                 try
@@ -198,9 +208,14 @@ namespace shadowsocks_csharp
             {
                 int bytesRead = connection.EndReceive(ar);
 
-                if (bytesRead > 0)
+                if (bytesRead > 1)
                 {
                     byte[] response = { 5, 0 };
+                    if (connetionRecvBuffer[0] != 5)
+                    {
+                        // reject socks 4
+                        response = new byte[]{ 0, 91 };
+                    }
                     connection.BeginSend(response, 0, response.Length, 0, new AsyncCallback(handshakeSendCallback), null);
                 }
                 else

shadowsocks-csharp/PACServer.cs

@@ -0,0 +1,89 @@
+using shadowsocks_csharp.Properties;
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+
+namespace shadowsocks_csharp
+{
+    class PACServer
+    {
+        Socket listener;
+        public void Start()
+        {
+            // Create a TCP/IP socket.
+            listener = new Socket(AddressFamily.InterNetwork,
+                SocketType.Stream, ProtocolType.Tcp);
+            IPEndPoint localEndPoint = new IPEndPoint(0, 8090);
+
+            // Bind the socket to the local endpoint and listen for incoming connections.
+            listener.Bind(localEndPoint);
+            listener.Listen(100);
+
+            listener.BeginAccept(
+                new AsyncCallback(AcceptCallback),
+                listener);
+        }
+
+
+        public void AcceptCallback(IAsyncResult ar)
+        {
+            try
+            {
+                Socket listener = (Socket)ar.AsyncState;
+                listener.BeginAccept(
+                    new AsyncCallback(AcceptCallback),
+                    listener);
+                Socket conn = listener.EndAccept(ar);
+
+                conn.BeginReceive(new byte[1024], 0, 256, 0,
+                    new AsyncCallback(receiveCallback), conn);
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine(e.ToString());
+            }
+        }
+
+        private void receiveCallback(IAsyncResult ar)
+        {
+            Socket conn = (Socket)ar.AsyncState;
+            try
+            {
+                int bytesRead = conn.EndReceive(ar);
+
+                string pac = Resources.proxy_pac;
+
+                if (bytesRead > 0)
+                {
+                    string text = String.Format(@"HTTP/1.1 200 OK
+Server: Shadowsocks
+Content-Type: application/x-ns-proxy-autoconfig
+Content-Length: {0}
+Connection: Close
+
+", System.Text.Encoding.UTF8.GetBytes(pac).Length) + pac;
+                    byte[] response = System.Text.Encoding.UTF8.GetBytes(text);
+                    conn.BeginSend(response, 0, response.Length, 0, new AsyncCallback(sendCallback), conn);
+                }
+                else
+                {
+                    conn.Close();
+                }
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine(e.ToString());
+                conn.Close();
+            }
+        }
+
+        private void sendCallback(IAsyncResult ar)
+        {
+            Socket conn = (Socket)ar.AsyncState;
+            conn.Shutdown(SocketShutdown.Send);
+        }
+
+    }
+}

shadowsocks-csharp/Properties/Resources.Designer.cs

@@ -1,7 +1,7 @@
 //------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by a tool.
-//     Runtime Version:4.0.30319.17929
+//     Runtime Version:4.0.30319.18444
 //
 //     Changes to this file may cause incorrect behavior and will be lost if
 //     the code is regenerated.
@@ -59,5 +59,37 @@ namespace shadowsocks_csharp.Properties {
                 resourceCulture = value;
             }
         }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to // Generated by gfwlist2pac
+        ///// https://github.com/clowwindy/gfwlist2pac
+        ///
+        ///var domains = {
+        ///  &quot;gimpshop.com&quot;: 1, 
+        ///  &quot;directcreative.com&quot;: 1, 
+        ///  &quot;speedpluss.org&quot;: 1, 
+        ///  &quot;mingpaovan.com&quot;: 1, 
+        ///  &quot;wikinews.org&quot;: 1, 
+        ///  &quot;joachims.org&quot;: 1, 
+        ///  &quot;maiio.net&quot;: 1, 
+        ///  &quot;idv.tw&quot;: 1, 
+        ///  &quot;mail-archive.com&quot;: 1, 
+        ///  &quot;surfeasy.com.au&quot;: 1, 
+        ///  &quot;hihistory.net&quot;: 1, 
+        ///  &quot;alexlur.org&quot;: 1, 
+        ///  &quot;finalion.jp&quot;: 1, 
+        ///  &quot;nrk.no&quot;: 1, 
+        ///  &quot;nyt.com&quot;: 1, 
+        ///  &quot;cmule.com&quot;: 1, 
+        ///  &quot;gappp.org&quot;: 1, 
+        ///  &quot;givemesomethingtoread.com&quot;: 1, 
+        ///  &quot;yahoo.com.tw&quot;: 1, 
+        ///   [rest of string was truncated]&quot;;.
+        /// </summary>
+        internal static string proxy_pac {
+            get {
+                return ResourceManager.GetString("proxy_pac", resourceCulture);
+            }
+        }
     }
 }

shadowsocks-csharp/Properties/Resources.resx

@@ -46,7 +46,7 @@
     
     mimetype: application/x-microsoft.net.object.binary.base64
     value   : The object must be serialized with 
-            : System.Serialization.Formatters.Binary.BinaryFormatter
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
             : and then encoded with base64 encoding.
     
     mimetype: application/x-microsoft.net.object.soap.base64
@@ -60,6 +60,7 @@
             : 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">
@@ -68,9 +69,10 @@
               <xsd:sequence>
                 <xsd:element name="value" type="xsd:string" minOccurs="0" />
               </xsd:sequence>
-              <xsd:attribute name="name" type="xsd:string" />
+              <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">
@@ -85,9 +87,10 @@
                 <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" msdata:Ordinal="1" />
+              <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">
@@ -114,4 +117,8 @@
   <resheader name="writer">
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
+  <assembly alias="System.Windows.Forms" name="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
+  <data name="proxy_pac" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\proxy.pac.txt;System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089;gb2312</value>
+  </data>
 </root>

shadowsocks-csharp/shadowsocks-csharp.csproj

@@ -87,6 +87,7 @@
     <Compile Include="Encrypt\OpensslEncryptor.cs" />
     <Compile Include="Encrypt\TableEncryptor.cs" />
     <Compile Include="Encrypt\IEncryptor.cs" />
+    <Compile Include="PACServer.cs" />
     <Compile Include="RC4.cs" />
     <Compile Include="Config.cs" />
     <Compile Include="Form1.cs">
@@ -126,6 +127,7 @@
   </ItemGroup>
   <ItemGroup>
     <Content Include="icon144.ico" />
+    <None Include="proxy.pac.txt" />
   </ItemGroup>
   <ItemGroup>
     <BootstrapperPackage Include="Microsoft.Net.Client.3.5">