--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/src/main/java/net/sourceforge/jsocks/SocksSocket.java	Thu Dec 03 11:23:55 2015 -0800
@@ -0,0 +1,332 @@
+package net.sourceforge.jsocks;
+
+import java.net.*;
+import java.io.*;
+
+/**
+ * SocksSocket tryies to look very similar to normal Socket,
+ * while allowing connections through the SOCKS4 or 5 proxy.
+ * To use this class you will have to identify proxy you need
+ * to use, CProxy class allows you to set default proxy, which
+ * will be used by all Socks aware sockets. You can also create
+ * either Socks4Proxy or Socks5Proxy, and use them by passing to the 
+ * appropriate constructors.
+ * <P>
+ * Using Socks package can be as easy as that:
+ *
+ * <pre><tt>
+ *
+ *     import Socks.*;
+ *     ....
+ *
+ *     try{
+ *        //Specify SOCKS5 proxy
+ *        CProxy.setDefaultProxy("socks-proxy",1080);
+ *
+ *        //OR you still use SOCKS4
+ *        //Code below uses SOCKS4 proxy
+ *        //CProxy.setDefaultProxy("socks-proxy",1080,userName);
+ *
+ *        Socket s = SocksSocket("some.host.of.mine",13);
+ *        readTimeFromSock(s);
+ *     }catch(SocksException sock_ex){
+ *        //Usually it will turn in more or less meaningfull message
+ *        System.err.println("SocksException:"+sock_ex);
+ *     }
+ *
+ * </tt></pre>
+ *<P>
+ * However if the need exist for more control, like resolving addresses
+ * remotely, or using some non-trivial authentication schemes, it can be done.
+ */
+
+public class SocksSocket extends Socket{
+   //Data members
+   protected CProxy proxy;
+   protected String localHost, remoteHost;
+   protected InetAddress localIP, remoteIP;
+   protected int localPort,remotePort;
+
+   private Socket directSock = null;
+
+   /**
+    * Tryies to connect to given host and port
+    * using default proxy. If no default proxy speciefied
+    * it throws SocksException with error code SOCKS_NO_PROXY.
+      @param host Machine to connect to.
+      @param port Port to which to connect.
+    * @see SocksSocket#SocksSocket(CProxy,String,int)
+    * @see Socks5Proxy#resolveAddrLocally
+    */
+   public SocksSocket(String host,int port)
+	  throws SocksException,UnknownHostException{
+      this(CProxy.defaultProxy,host,port);
+   }
+   /**
+    * Connects to host port using given proxy server.
+      @param p CProxy to use.
+      @param host Machine to connect to.
+      @param port Port to which to connect.
+      @throws UnknownHostException 
+      If one of the following happens:
+      <ol>
+
+      <li> CProxy settings say that address should be resolved locally, but
+           this fails.
+      <li> CProxy settings say that the host should be contacted directly but
+           host name can't be resolved. 
+      </ol>
+      @throws SocksException
+      If one of the following happens:
+      <ul>
+       <li> CProxy is is null.
+       <li> CProxy settings say that the host should be contacted directly but
+            this fails.
+       <li> Socks Server can't be contacted.
+       <li> Authentication fails.
+       <li> Connection is not allowed by the SOCKS proxy.
+       <li> SOCKS proxy can't establish the connection.
+       <li> Any IO error occured.
+       <li> Any protocol error occured.
+      </ul>
+      @throws IOexception if anything is wrong with I/O.
+      @see Socks5Proxy#resolveAddrLocally
+    */
+   public SocksSocket(CProxy p,String host,int port)
+	  throws SocksException,UnknownHostException{
+
+
+      if(p == null) throw new SocksException(CProxy.SOCKS_NO_PROXY);
+      //proxy=p;
+      proxy = p.copy();
+      remoteHost = host;
+      remotePort = port;
+      if(proxy.isDirect(host)){
+         remoteIP = InetAddress.getByName(host);
+         doDirect();
+      }
+      else
+         processReply(proxy.connect(host,port));
+   }
+
+
+   /**
+    * Tryies to connect to given ip and port
+    * using default proxy. If no default proxy speciefied
+    * it throws SocksException with error code SOCKS_NO_PROXY.
+      @param ip Machine to connect to.
+      @param port Port to which to connect.
+    * @see SocksSocket#SocksSocket(CProxy,String,int)
+    */
+   public SocksSocket(InetAddress ip, int port) throws SocksException{
+      this(CProxy.defaultProxy,ip,port);
+   }
+
+   /**
+      Connects to given ip and port using given CProxy server.
+      @param p CProxy to use.
+      @param ip Machine to connect to.
+      @param port Port to which to connect.
+
+    */
+   public SocksSocket(CProxy p,InetAddress ip, int port) throws SocksException{
+      if(p == null) throw new SocksException(CProxy.SOCKS_NO_PROXY);
+      this.proxy = p.copy();
+      this.remoteIP = ip;
+      this.remotePort = port;
+      this.remoteHost = ip.getHostName();
+      if(proxy.isDirect(remoteIP))
+        doDirect();
+      else
+        processReply(proxy.connect(ip,port));
+   }
+
+
+   /**
+    * These 2 constructors are used by the SocksServerSocket.
+    * This socket simply overrides remoteHost, remotePort
+    */
+   protected SocksSocket(String  host,int port,CProxy proxy){
+      this.remotePort = port;
+      this.proxy = proxy;
+      this.localIP = proxy.proxySocket.getLocalAddress();
+      this.localPort = proxy.proxySocket.getLocalPort();
+      this.remoteHost = host;
+   }
+   protected SocksSocket(InetAddress ip,int port,CProxy proxy){
+      remoteIP = ip;
+      remotePort = port;
+      this.proxy = proxy;
+      this.localIP = proxy.proxySocket.getLocalAddress();
+      this.localPort = proxy.proxySocket.getLocalPort();
+      remoteHost = remoteIP.getHostName();
+   }
+
+   /**
+    * Same as Socket
+    */
+   public void close() throws IOException{
+      if(proxy!= null)proxy.endSession();
+      proxy = null;
+   }
+   /**
+    * Same as Socket
+    */
+   public InputStream getInputStream(){
+      return proxy.in;
+   }
+   /**
+    * Same as Socket
+    */
+   public OutputStream getOutputStream(){
+      return proxy.out;
+   }
+   /**
+    * Same as Socket
+    */
+   public int getPort(){
+      return remotePort;
+   }
+   /**
+    * Returns remote host name, it is usefull in cases when addresses
+    * are resolved by proxy, and we can't create InetAddress object.
+      @return The name of the host this socket is connected to.
+    */
+   public String getHost(){
+      return remoteHost;
+   }
+   /**
+    * Get remote host as InetAddress object, might return null if 
+    * addresses are resolved by proxy, and it is not possible to resolve
+    * it locally
+      @return Ip address of the host this socket is connected to, or null
+      if address was returned by the proxy as DOMAINNAME and can't be
+      resolved locally.
+    */
+   public InetAddress getInetAddress(){
+      if(remoteIP == null){
+	 try{
+	   remoteIP = InetAddress.getByName(remoteHost);
+	 }catch(UnknownHostException e){
+	   return null;
+	 }
+      }
+      return remoteIP;
+   }
+
+   /**
+    * Get the port assigned by the proxy for the socket, not
+    * the port on locall machine as in Socket. 
+      @return Port of the socket used on the proxy server.
+    */
+   public int getLocalPort(){
+      return localPort;
+   }
+
+   /**
+    * Get address assigned by proxy to make a remote connection,
+    * it might be different from the host specified for the proxy.
+    * Can return null if socks server returned this address as hostname
+    * and it can't be resolved locally, use getLocalHost() then.
+      @return Address proxy is using to make a connection.
+    */
+   public InetAddress getLocalAddress(){
+      if(localIP == null){
+	 try{
+	    localIP = InetAddress.getByName(localHost);
+	 }catch(UnknownHostException e){
+	   return null;
+	 }
+      }
+      return localIP;
+   }
+   /**
+      Get name of the host, proxy has assigned to make a remote connection
+      for this socket. This method is usefull when proxy have returned
+      address as hostname, and we can't resolve it on this machine.
+      @return The name of the host proxy is using to make a connection.
+   */
+   public String getLocalHost(){
+      return localHost;
+   }
+
+   /**
+     Same as socket.
+   */
+   public void setSoLinger(boolean on,int val) throws SocketException{
+      proxy.proxySocket.setSoLinger(on,val);
+   }
+   /**
+     Same as socket.
+   */
+   public int getSoLinger(int timeout) throws SocketException{
+      return proxy.proxySocket.getSoLinger();
+   }
+   /**
+     Same as socket.
+   */
+   public void setSoTimeout(int timeout) throws SocketException{
+      proxy.proxySocket.setSoTimeout(timeout);
+   }
+   /**
+     Same as socket.
+   */
+   public int getSoTimeout(int timeout) throws SocketException{
+      return proxy.proxySocket.getSoTimeout();
+   }
+   /**
+     Same as socket.
+   */
+   public void setTcpNoDelay(boolean on) throws SocketException{
+     proxy.proxySocket.setTcpNoDelay(on);
+   }
+   /**
+     Same as socket.
+   */
+   public boolean getTcpNoDelay() throws SocketException{
+     return proxy.proxySocket.getTcpNoDelay();
+   }
+
+   /**
+     Get string representation of the socket.
+   */
+   public String toString(){
+      if(directSock!=null) return "Direct connection:"+directSock;
+      return ("Proxy:"+proxy+";"+"addr:"+remoteHost+",port:"+remotePort
+                                +",localport:"+localPort);
+
+   }
+
+//Private Methods
+//////////////////
+
+   private void processReply(ProxyMessage reply)throws SocksException{
+      localPort = reply.port;
+      /*
+       * If the server have assigned same host as it was contacted on
+       * it might return an address of all zeros
+       */
+      if(reply.host.equals("0.0.0.0")){
+         localIP = proxy.proxyIP;
+         localHost = localIP.getHostName();
+      }else{
+         localHost = reply.host;
+         localIP = reply.ip;
+      }
+   }
+   private void doDirect()throws SocksException{
+      try{
+         //System.out.println("IP:"+remoteIP+":"+remotePort);
+         directSock = new Socket(remoteIP,remotePort);
+         proxy.out = directSock.getOutputStream();
+         proxy.in  = directSock.getInputStream();
+         proxy.proxySocket = directSock;
+         localIP = directSock.getLocalAddress();
+         localPort = directSock.getLocalPort();
+      }catch(IOException io_ex){
+         throw new SocksException(CProxy.SOCKS_DIRECT_FAILED,
+                                  "Direct connect failed:"+io_ex);
+      }
+   }
+
+}