Forwarder.java revision bd8c83db8f424a8cfbf94cd4915d7b99b034358c 
1/*
2 * Copyright (C) 2010 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
17package com.android.dumprendertree2.forwarder;
18
19import android.util.Log;
20
21import java.io.IOException;
22import java.net.ServerSocket;
23import java.net.Socket;
24import java.util.HashSet;
25import java.util.Set;
26
27/**
28 * A port forwarding server. Listens on localhost on specified port and forwards the tcp
29 * communications to external socket via adb networking proxy.
30 */
31public class Forwarder extends Thread {
32    private static final String LOG_TAG = "Forwarder";
33
34    private int mPort;
35    private String mRemoteMachineIpAddress;
36
37    private ServerSocket mServerSocket;
38
39    private Set<ConnectionHandler> mConnectionHandlers = new HashSet<ConnectionHandler>();
40
41    public Forwarder(int port, String remoteMachineIpAddress) {
42        mPort = port;
43        mRemoteMachineIpAddress = remoteMachineIpAddress;
44    }
45
46    @Override
47    public void start() {
48        Log.i(LOG_TAG, "start(): Starting fowarder on port: " + mPort);
49
50        try {
51            mServerSocket = new ServerSocket(mPort);
52        } catch (IOException e) {
53            Log.e(LOG_TAG, "mPort=" + mPort, e);
54            return;
55        }
56
57        super.start();
58    }
59
60    @Override
61    public void run() {
62        while (true) {
63            /** These sockets will be closed when Forwarder.stop() is called */
64            Socket localSocket;
65            Socket remoteSocket;
66            try {
67                localSocket = mServerSocket.accept();
68                remoteSocket = AdbUtils.getSocketToRemoteMachine(mRemoteMachineIpAddress,
69                        mPort);
70            } catch (IOException e) {
71                /** This most likely means that mServerSocket is already closed */
72                Log.w(LOG_TAG, "mPort=" + mPort, e);
73                break;
74            }
75
76            if (remoteSocket == null) {
77                try {
78                    localSocket.close();
79                } catch (IOException e) {
80                    Log.e(LOG_TAG, "mPort=" + mPort, e);
81                }
82
83                Log.e(LOG_TAG, "run(): mPort= " + mPort + " Failed to start forwarding from " +
84                        localSocket);
85                continue;
86            }
87
88            final ConnectionHandler connectionHandler =
89                    new ConnectionHandler(localSocket, remoteSocket);
90
91            /**
92             * We have to close the sockets after the ConnectionHandler finishes, so we
93             * don't get "Too may open files" exception. We also remove the ConnectionHandler
94             * from the collection to avoid memory issues.
95             * */
96            ConnectionHandler.OnFinishedCallback callback =
97                    new ConnectionHandler.OnFinishedCallback() {
98                @Override
99                public void onFinished() {
100                    synchronized (this) {
101                        if (mConnectionHandlers.remove(connectionHandler)) {
102                            Log.d(LOG_TAG, "removeConnectionHandler(): removed");
103                        } else {
104                            assert false : "removeConnectionHandler(): not in the collection";
105                        }
106                    }
107                }
108            };
109            connectionHandler.registerOnConnectionHandlerFinishedCallback(callback);
110
111            synchronized (this) {
112                mConnectionHandlers.add(connectionHandler);
113            }
114            connectionHandler.start();
115        }
116
117        synchronized (this) {
118            for (ConnectionHandler connectionHandler : mConnectionHandlers) {
119                connectionHandler.stop();
120            }
121        }
122    }
123
124    public void finish() {
125        try {
126            mServerSocket.close();
127        } catch (IOException e) {
128            Log.e(LOG_TAG, "mPort=" + mPort, e);
129        }
130    }
131}