实例介绍
【实例简介】
A packet interceptor for Android built on top of VpnService
【实例截图】
【核心代码】
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 | package xyz.hexene.localvpn;import android.app.PendingIntent;import android.content.Intent;import android.net.VpnService;import android.os.ParcelFileDescriptor;import android.support.v4.content.LocalBroadcastManager;import android.util.Log;import java.io.Closeable;import java.io.FileDescriptor;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.nio.ByteBuffer;import java.nio.channels.FileChannel;import java.nio.channels.Selector;import java.util.concurrent.ConcurrentLinkedQueue;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class LocalVPNService extends VpnService{ private static final String TAG = LocalVPNService.class.getSimpleName(); private static final String VPN_ADDRESS = "10.0.0.2"; // Only IPv4 support for now private static final String VPN_ROUTE = "0.0.0.0"; // Intercept everything public static final String BROADCAST_VPN_STATE = "xyz.hexene.localvpn.VPN_STATE"; private static boolean isRunning = false; private ParcelFileDescriptor vpnInterface = null; private PendingIntent pendingIntent; private ConcurrentLinkedQueue<Packet> deviceToNetworkUDPQueue; private ConcurrentLinkedQueue<Packet> deviceToNetworkTCPQueue; private ConcurrentLinkedQueue<ByteBuffer> networkToDeviceQueue; private ExecutorService executorService; private Selector udpSelector; private Selector tcpSelector; @Override public void onCreate() { super.onCreate(); isRunning = true; setupVPN(); try { udpSelector = Selector.open(); tcpSelector = Selector.open(); deviceToNetworkUDPQueue = new ConcurrentLinkedQueue<>(); deviceToNetworkTCPQueue = new ConcurrentLinkedQueue<>(); networkToDeviceQueue = new ConcurrentLinkedQueue<>(); executorService = Executors.newFixedThreadPool(5); executorService.submit(new UDPInput(networkToDeviceQueue, udpSelector)); executorService.submit(new UDPOutput(deviceToNetworkUDPQueue, udpSelector, this)); executorService.submit(new TCPInput(networkToDeviceQueue, tcpSelector)); executorService.submit(new TCPOutput(deviceToNetworkTCPQueue, networkToDeviceQueue, tcpSelector, this)); executorService.submit(new VPNRunnable(vpnInterface.getFileDescriptor(), deviceToNetworkUDPQueue, deviceToNetworkTCPQueue, networkToDeviceQueue)); LocalBroadcastManager.getInstance(this).sendBroadcast(new Intent(BROADCAST_VPN_STATE).putExtra("running", true)); Log.i(TAG, "Started"); } catch (IOException e) { // TODO: Here and elsewhere, we should explicitly notify the user of any errors // and suggest that they stop the service, since we can't do it ourselves Log.e(TAG, "Error starting service", e); cleanup(); } } private void setupVPN() { if (vpnInterface == null) { Builder builder = new Builder(); builder.addAddress(VPN_ADDRESS, 32); builder.addRoute(VPN_ROUTE, 0); vpnInterface = builder.setSession(getString(R.string.app_name)).setConfigureIntent(pendingIntent).establish(); } } @Override public int onStartCommand(Intent intent, int flags, int startId) { return START_STICKY; } public static boolean isRunning() { return isRunning; } @Override public void onDestroy() { super.onDestroy(); isRunning = false; executorService.shutdownNow(); cleanup(); Log.i(TAG, "Stopped"); } private void cleanup() { deviceToNetworkTCPQueue = null; deviceToNetworkUDPQueue = null; networkToDeviceQueue = null; ByteBufferPool.clear(); closeResources(udpSelector, tcpSelector, vpnInterface); } // TODO: Move this to a "utils" class for reuse private static void closeResources(Closeable... resources) { for (Closeable resource : resources) { try { resource.close(); } catch (IOException e) { // Ignore } } } private static class VPNRunnable implements Runnable { private static final String TAG = VPNRunnable.class.getSimpleName(); private FileDescriptor vpnFileDescriptor; private ConcurrentLinkedQueue<Packet> deviceToNetworkUDPQueue; private ConcurrentLinkedQueue<Packet> deviceToNetworkTCPQueue; private ConcurrentLinkedQueue<ByteBuffer> networkToDeviceQueue; public VPNRunnable(FileDescriptor vpnFileDescriptor, ConcurrentLinkedQueue<Packet> deviceToNetworkUDPQueue, ConcurrentLinkedQueue<Packet> deviceToNetworkTCPQueue, ConcurrentLinkedQueue<ByteBuffer> networkToDeviceQueue) { this.vpnFileDescriptor = vpnFileDescriptor; this.deviceToNetworkUDPQueue = deviceToNetworkUDPQueue; this.deviceToNetworkTCPQueue = deviceToNetworkTCPQueue; this.networkToDeviceQueue = networkToDeviceQueue; } @Override public void run() { Log.i(TAG, "Started"); FileChannel vpnInput = new FileInputStream(vpnFileDescriptor).getChannel(); FileChannel vpnOutput = new FileOutputStream(vpnFileDescriptor).getChannel(); try { ByteBuffer bufferToNetwork = null; boolean dataSent = true; boolean dataReceived; while (!Thread.interrupted()) { if (dataSent) bufferToNetwork = ByteBufferPool.acquire(); else bufferToNetwork.clear(); // TODO: Block when not connected int readBytes = vpnInput.read(bufferToNetwork); if (readBytes > 0) { dataSent = true; bufferToNetwork.flip(); Packet packet = new Packet(bufferToNetwork); if (packet.isUDP()) { deviceToNetworkUDPQueue.offer(packet); } else if (packet.isTCP()) { deviceToNetworkTCPQueue.offer(packet); } else { Log.w(TAG, "Unknown packet type"); Log.w(TAG, packet.ip4Header.toString()); dataSent = false; } } else { dataSent = false; } ByteBuffer bufferFromNetwork = networkToDeviceQueue.poll(); if (bufferFromNetwork != null) { bufferFromNetwork.flip(); while (bufferFromNetwork.hasRemaining()) vpnOutput.write(bufferFromNetwork); dataReceived = true; ByteBufferPool.release(bufferFromNetwork); } else { dataReceived = false; } // TODO: Sleep-looping is not very battery-friendly, consider blocking instead // Confirm if throughput with ConcurrentQueue is really higher compared to BlockingQueue if (!dataSent && !dataReceived) Thread.sleep(10); } } catch (InterruptedException e) { Log.i(TAG, "Stopping"); } catch (IOException e) { Log.w(TAG, e.toString(), e); } finally { closeResources(vpnInput, vpnOutput); } } } |
标签： VPN
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