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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.dumprendertree.forwarder;
     18 
     19 import android.util.Log;
     20 
     21 import java.io.IOException;
     22 import java.io.InputStream;
     23 import java.io.OutputStream;
     24 import java.net.Socket;
     25 
     26 /**
     27  *
     28  * Worker class for {@link ForwardServer}. A Forwarder will be created once the ForwardServer
     29  * accepts an incoming connection, and it will then forward the incoming/outgoing streams to a
     30  * connection already proxied by adb networking (see also {@link AdbUtils}).
     31  *
     32  */
     33 public class Forwarder {
     34 
     35     private ForwardServer server;
     36     private Socket from, to;
     37 
     38     private static final String LOGTAG = "Forwarder";
     39 
     40     public Forwarder (Socket from, Socket to, ForwardServer server) {
     41         this.server = server;
     42         this.from = from;
     43         this.to = to;
     44         server.register(this);
     45     }
     46 
     47     public void start() {
     48         Thread outgoing = new Thread(new SocketPipe(from, to));
     49         Thread incoming = new Thread(new SocketPipe(to, from));
     50         outgoing.setName(LOGTAG);
     51         incoming.setName(LOGTAG);
     52         outgoing.start();
     53         incoming.start();
     54     }
     55 
     56     public void stop() {
     57         shutdown(from);
     58         shutdown(to);
     59     }
     60 
     61     private void shutdown(Socket socket) {
     62         try {
     63             socket.shutdownInput();
     64         } catch (IOException e) {
     65             Log.v(LOGTAG, "Socket#shutdownInput", e);
     66         }
     67         try {
     68             socket.shutdownOutput();
     69         } catch (IOException e) {
     70             Log.v(LOGTAG, "Socket#shutdownOutput", e);
     71         }
     72         try {
     73             socket.close();
     74         } catch (IOException e) {
     75             Log.v(LOGTAG, "Socket#close", e);
     76         }
     77     }
     78 
     79     private class SocketPipe implements Runnable {
     80 
     81         private Socket in, out;
     82 
     83         public SocketPipe(Socket in, Socket out) {
     84             this.in = in;
     85             this.out = out;
     86         }
     87 
     88         public void run() {
     89             try {
     90                 int length;
     91                 InputStream is = in.getInputStream();
     92                 OutputStream os = out.getOutputStream();
     93                 byte[] buffer = new byte[4096];
     94                 while ((length = is.read(buffer)) > 0) {
     95                     os.write(buffer, 0, length);
     96                 }
     97             } catch (IOException ioe) {
     98             } finally {
     99                 server.unregister(Forwarder.this);
    100             }
    101         }
    102 
    103         @Override
    104         public String toString() {
    105             return "SocketPipe{" + in + "=>" + out  + "}";
    106         }
    107     }
    108 }
    109