nxpandroid | 64fd68c | 2015-09-23 16:45:15 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 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 | */ |
Bhupendra Pawar | 9f0c838 | 2018-01-11 17:05:27 +0530 | [diff] [blame] | 16 | |
nxpandroid | 64fd68c | 2015-09-23 16:45:15 +0530 | [diff] [blame] | 17 | package com.android.nfc.snep; |
| 18 | |
| 19 | import com.android.nfc.DeviceHost.LlcpServerSocket; |
| 20 | import com.android.nfc.DeviceHost.LlcpSocket; |
| 21 | import com.android.nfc.LlcpException; |
| 22 | import com.android.nfc.NfcService; |
| 23 | |
| 24 | import android.nfc.NdefMessage; |
| 25 | import android.nfc.NfcAdapter; |
| 26 | import android.util.Log; |
| 27 | |
| 28 | import java.io.IOException; |
| 29 | |
| 30 | /** |
| 31 | * A simple server that accepts NDEF messages pushed to it over an LLCP connection. Those messages |
| 32 | * are typically set on the client side by using {@link NfcAdapter#enableForegroundNdefPush}. |
| 33 | */ |
| 34 | public final class SnepServer { |
| 35 | private static final String TAG = "SnepServer"; |
| 36 | private static final boolean DBG = false; |
| 37 | private static final int DEFAULT_MIU = 248; |
| 38 | private static final int DEFAULT_RW_SIZE = 1; |
| 39 | |
| 40 | public static final int DEFAULT_PORT = 4; |
| 41 | |
| 42 | public static final String DEFAULT_SERVICE_NAME = "urn:nfc:sn:snep"; |
| 43 | |
| 44 | final Callback mCallback; |
| 45 | final String mServiceName; |
| 46 | final int mServiceSap; |
| 47 | final int mFragmentLength; |
| 48 | final int mMiu; |
| 49 | final int mRwSize; |
| 50 | |
| 51 | /** Protected by 'this', null when stopped, non-null when running */ |
| 52 | ServerThread mServerThread = null; |
| 53 | boolean mServerRunning = false; |
| 54 | |
| 55 | public interface Callback { |
| 56 | public SnepMessage doPut(NdefMessage msg); |
| 57 | public SnepMessage doGet(int acceptableLength, NdefMessage msg); |
| 58 | } |
| 59 | |
| 60 | public SnepServer(Callback callback) { |
| 61 | mCallback = callback; |
| 62 | mServiceName = DEFAULT_SERVICE_NAME; |
| 63 | mServiceSap = DEFAULT_PORT; |
| 64 | mFragmentLength = -1; |
| 65 | mMiu = DEFAULT_MIU; |
| 66 | mRwSize = DEFAULT_RW_SIZE; |
| 67 | } |
| 68 | |
| 69 | public SnepServer(String serviceName, int serviceSap, Callback callback) { |
| 70 | mCallback = callback; |
| 71 | mServiceName = serviceName; |
| 72 | mServiceSap = serviceSap; |
| 73 | mFragmentLength = -1; |
| 74 | mMiu = DEFAULT_MIU; |
| 75 | mRwSize = DEFAULT_RW_SIZE; |
| 76 | } |
| 77 | |
| 78 | public SnepServer(Callback callback, int miu, int rwSize) { |
| 79 | mCallback = callback; |
| 80 | mServiceName = DEFAULT_SERVICE_NAME; |
| 81 | mServiceSap = DEFAULT_PORT; |
| 82 | mFragmentLength = -1; |
| 83 | mMiu = miu; |
| 84 | mRwSize = rwSize; |
| 85 | } |
| 86 | |
| 87 | SnepServer(String serviceName, int serviceSap, int fragmentLength, Callback callback) { |
| 88 | mCallback = callback; |
| 89 | mServiceName = serviceName; |
| 90 | mServiceSap = serviceSap; |
| 91 | mFragmentLength = fragmentLength; |
| 92 | mMiu = DEFAULT_MIU; |
| 93 | mRwSize = DEFAULT_RW_SIZE; |
| 94 | } |
| 95 | |
| 96 | /** Connection class, used to handle incoming connections */ |
| 97 | private class ConnectionThread extends Thread { |
| 98 | private final LlcpSocket mSock; |
| 99 | private final SnepMessenger mMessager; |
| 100 | |
| 101 | ConnectionThread(LlcpSocket socket, int fragmentLength) { |
| 102 | super(TAG); |
| 103 | mSock = socket; |
| 104 | mMessager = new SnepMessenger(false, socket, fragmentLength); |
| 105 | } |
| 106 | |
| 107 | @Override |
| 108 | public void run() { |
| 109 | if (DBG) Log.d(TAG, "starting connection thread"); |
| 110 | try { |
| 111 | boolean running; |
| 112 | synchronized (SnepServer.this) { |
| 113 | running = mServerRunning; |
| 114 | } |
| 115 | |
| 116 | while (running) { |
| 117 | if (!handleRequest(mMessager, mCallback)) { |
| 118 | break; |
| 119 | } |
| 120 | |
| 121 | synchronized (SnepServer.this) { |
| 122 | running = mServerRunning; |
| 123 | } |
| 124 | } |
| 125 | } catch (IOException e) { |
| 126 | if (DBG) Log.e(TAG, "Closing from IOException"); |
| 127 | } finally { |
| 128 | try { |
| 129 | if (DBG) Log.d(TAG, "about to close"); |
| 130 | mSock.close(); |
| 131 | } catch (IOException e) { |
| 132 | // ignore |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | if (DBG) Log.d(TAG, "finished connection thread"); |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | static boolean handleRequest(SnepMessenger messenger, Callback callback) throws IOException { |
| 141 | SnepMessage request; |
| 142 | try { |
| 143 | request = messenger.getMessage(); |
| 144 | } catch (SnepException e) { |
| 145 | if (DBG) Log.w(TAG, "Bad snep message", e); |
| 146 | try { |
| 147 | messenger.sendMessage(SnepMessage.getMessage( |
| 148 | SnepMessage.RESPONSE_BAD_REQUEST)); |
| 149 | } catch (IOException e2) { |
| 150 | // Ignore |
| 151 | } |
| 152 | return false; |
| 153 | } |
| 154 | |
| 155 | if (((request.getVersion() & 0xF0) >> 4) != SnepMessage.VERSION_MAJOR) { |
| 156 | messenger.sendMessage(SnepMessage.getMessage( |
| 157 | SnepMessage.RESPONSE_UNSUPPORTED_VERSION)); |
Bhupendra Pawar | 9f0c838 | 2018-01-11 17:05:27 +0530 | [diff] [blame] | 158 | } else if (NfcService.sIsDtaMode && ((request.getLength() > SnepMessage.MAL_IUT) || |
| 159 | request.getLength() == SnepMessage.MAL)) { |
nxpandroid | 64fd68c | 2015-09-23 16:45:15 +0530 | [diff] [blame] | 160 | if (DBG) Log.d(TAG, "Bad requested length"); |
| 161 | messenger.sendMessage(SnepMessage.getMessage(SnepMessage.RESPONSE_REJECT)); |
| 162 | } else if (request.getField() == SnepMessage.REQUEST_GET) { |
| 163 | messenger.sendMessage(callback.doGet(request.getAcceptableLength(), |
| 164 | request.getNdefMessage())); |
| 165 | } else if (request.getField() == SnepMessage.REQUEST_PUT) { |
| 166 | if (DBG) Log.d(TAG, "putting message " + request.toString()); |
| 167 | messenger.sendMessage(callback.doPut(request.getNdefMessage())); |
| 168 | } else { |
| 169 | if (DBG) Log.d(TAG, "Unknown request (" + request.getField() +")"); |
| 170 | messenger.sendMessage(SnepMessage.getMessage( |
| 171 | SnepMessage.RESPONSE_BAD_REQUEST)); |
| 172 | } |
| 173 | return true; |
| 174 | } |
| 175 | |
| 176 | /** Server class, used to listen for incoming connection request */ |
| 177 | class ServerThread extends Thread { |
| 178 | private boolean mThreadRunning = true; |
| 179 | LlcpServerSocket mServerSocket; |
| 180 | |
| 181 | @Override |
| 182 | public void run() { |
| 183 | boolean threadRunning; |
| 184 | synchronized (SnepServer.this) { |
| 185 | threadRunning = mThreadRunning; |
| 186 | } |
| 187 | |
| 188 | while (threadRunning) { |
| 189 | if (DBG) Log.d(TAG, "about create LLCP service socket"); |
| 190 | try { |
| 191 | synchronized (SnepServer.this) { |
| 192 | mServerSocket = NfcService.getInstance().createLlcpServerSocket(mServiceSap, |
| 193 | mServiceName, mMiu, mRwSize, 1024); |
| 194 | } |
| 195 | if (mServerSocket == null) { |
| 196 | if (DBG) Log.d(TAG, "failed to create LLCP service socket"); |
| 197 | return; |
| 198 | } |
| 199 | if (DBG) Log.d(TAG, "created LLCP service socket"); |
| 200 | synchronized (SnepServer.this) { |
| 201 | threadRunning = mThreadRunning; |
| 202 | } |
| 203 | |
| 204 | while (threadRunning) { |
| 205 | LlcpServerSocket serverSocket; |
| 206 | synchronized (SnepServer.this) { |
| 207 | serverSocket = mServerSocket; |
| 208 | } |
| 209 | |
| 210 | if (serverSocket == null) { |
| 211 | if (DBG) Log.d(TAG, "Server socket shut down."); |
| 212 | return; |
| 213 | } |
| 214 | if (DBG) Log.d(TAG, "about to accept"); |
| 215 | LlcpSocket communicationSocket = serverSocket.accept(); |
| 216 | if (DBG) Log.d(TAG, "accept returned " + communicationSocket); |
| 217 | if (communicationSocket != null) { |
| 218 | int fragmentLength = (mFragmentLength == -1) ? |
| 219 | mMiu : Math.min(mMiu, mFragmentLength); |
| 220 | new ConnectionThread(communicationSocket, fragmentLength).start(); |
| 221 | } |
| 222 | |
| 223 | synchronized (SnepServer.this) { |
| 224 | threadRunning = mThreadRunning; |
| 225 | } |
| 226 | } |
| 227 | if (DBG) Log.d(TAG, "stop running"); |
| 228 | } catch (LlcpException e) { |
| 229 | Log.e(TAG, "llcp error", e); |
| 230 | } catch (IOException e) { |
Suhas Suresh | f1a5edb | 2018-04-27 11:18:14 +0530 | [diff] [blame^] | 231 | if (DBG) Log.d(TAG, "IO error"); |
nxpandroid | 64fd68c | 2015-09-23 16:45:15 +0530 | [diff] [blame] | 232 | } finally { |
| 233 | synchronized (SnepServer.this) { |
| 234 | if (mServerSocket != null) { |
| 235 | if (DBG) Log.d(TAG, "about to close"); |
| 236 | try { |
| 237 | mServerSocket.close(); |
| 238 | } catch (IOException e) { |
| 239 | // ignore |
| 240 | } |
| 241 | mServerSocket = null; |
| 242 | } |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | synchronized (SnepServer.this) { |
| 247 | threadRunning = mThreadRunning; |
| 248 | } |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | public void shutdown() { |
| 253 | synchronized (SnepServer.this) { |
| 254 | mThreadRunning = false; |
| 255 | if (mServerSocket != null) { |
| 256 | try { |
| 257 | mServerSocket.close(); |
| 258 | } catch (IOException e) { |
| 259 | // ignore |
| 260 | } |
| 261 | mServerSocket = null; |
| 262 | } |
| 263 | } |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | public void start() { |
| 268 | synchronized (SnepServer.this) { |
| 269 | if (DBG) Log.d(TAG, "start, thread = " + mServerThread); |
| 270 | if (mServerThread == null) { |
| 271 | if (DBG) Log.d(TAG, "starting new server thread"); |
| 272 | mServerThread = new ServerThread(); |
| 273 | mServerThread.start(); |
| 274 | mServerRunning = true; |
| 275 | } |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | public void stop() { |
| 280 | synchronized (SnepServer.this) { |
| 281 | if (DBG) Log.d(TAG, "stop, thread = " + mServerThread); |
| 282 | if (mServerThread != null) { |
| 283 | if (DBG) Log.d(TAG, "shuting down server thread"); |
| 284 | mServerThread.shutdown(); |
| 285 | mServerThread = null; |
| 286 | mServerRunning = false; |
| 287 | } |
| 288 | } |
| 289 | } |
| 290 | } |