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 private static final int BUFFER_SIZE = 16384; 40 41 public Forwarder (Socket from, Socket to, ForwardServer server) { 42 this.server = server; 43 this.from = from; 44 this.to = to; 45 server.register(this); 46 } 47 48 public void start() { 49 Thread outgoing = new Thread(new SocketPipe(from, to)); 50 Thread incoming = new Thread(new SocketPipe(to, from)); 51 outgoing.setName(LOGTAG); 52 incoming.setName(LOGTAG); 53 outgoing.start(); 54 incoming.start(); 55 } 56 57 public void stop() { 58 shutdown(from); 59 shutdown(to); 60 } 61 62 private void shutdown(Socket socket) { 63 try { 64 socket.shutdownInput(); 65 } catch (IOException e) { 66 Log.v(LOGTAG, "Socket#shutdownInput", e); 67 } 68 try { 69 socket.shutdownOutput(); 70 } catch (IOException e) { 71 Log.v(LOGTAG, "Socket#shutdownOutput", e); 72 } 73 try { 74 socket.close(); 75 } catch (IOException e) { 76 Log.v(LOGTAG, "Socket#close", e); 77 } 78 } 79 80 private class SocketPipe implements Runnable { 81 82 private Socket in, out; 83 84 public SocketPipe(Socket in, Socket out) { 85 this.in = in; 86 this.out = out; 87 } 88 89 public void run() { 90 try { 91 int length; 92 InputStream is = in.getInputStream(); 93 OutputStream os = out.getOutputStream(); 94 byte[] buffer = new byte[BUFFER_SIZE]; 95 while ((length = is.read(buffer)) > 0) { 96 os.write(buffer, 0, length); 97 } 98 } catch (IOException ioe) { 99 } finally { 100 server.unregister(Forwarder.this); 101 } 102 } 103 104 @Override 105 public String toString() { 106 return "SocketPipe{" + in + "=>" + out + "}"; 107 } 108 } 109 } 110