1 /* 2 * Copyright (C) 2012 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 android.bluetooth; 18 19 import android.os.ParcelUuid; 20 import android.os.ParcelFileDescriptor; 21 import android.os.RemoteException; 22 import android.util.Log; 23 24 import java.io.BufferedInputStream; 25 import java.io.Closeable; 26 import java.io.FileDescriptor; 27 import java.io.IOException; 28 import java.io.InputStream; 29 import java.io.OutputStream; 30 import java.util.Arrays; 31 import java.util.Locale; 32 import java.util.UUID; 33 import android.net.LocalSocket; 34 35 import java.nio.Buffer; 36 import java.nio.ByteOrder; 37 import java.nio.ByteBuffer; 38 /** 39 * A connected or connecting Bluetooth socket. 40 * 41 * <p>The interface for Bluetooth Sockets is similar to that of TCP sockets: 42 * {@link java.net.Socket} and {@link java.net.ServerSocket}. On the server 43 * side, use a {@link BluetoothServerSocket} to create a listening server 44 * socket. When a connection is accepted by the {@link BluetoothServerSocket}, 45 * it will return a new {@link BluetoothSocket} to manage the connection. 46 * On the client side, use a single {@link BluetoothSocket} to both initiate 47 * an outgoing connection and to manage the connection. 48 * 49 * <p>The most common type of Bluetooth socket is RFCOMM, which is the type 50 * supported by the Android APIs. RFCOMM is a connection-oriented, streaming 51 * transport over Bluetooth. It is also known as the Serial Port Profile (SPP). 52 * 53 * <p>To create a {@link BluetoothSocket} for connecting to a known device, use 54 * {@link BluetoothDevice#createRfcommSocketToServiceRecord 55 * BluetoothDevice.createRfcommSocketToServiceRecord()}. 56 * Then call {@link #connect()} to attempt a connection to the remote device. 57 * This call will block until a connection is established or the connection 58 * fails. 59 * 60 * <p>To create a {@link BluetoothSocket} as a server (or "host"), see the 61 * {@link BluetoothServerSocket} documentation. 62 * 63 * <p>Once the socket is connected, whether initiated as a client or accepted 64 * as a server, open the IO streams by calling {@link #getInputStream} and 65 * {@link #getOutputStream} in order to retrieve {@link java.io.InputStream} 66 * and {@link java.io.OutputStream} objects, respectively, which are 67 * automatically connected to the socket. 68 * 69 * <p>{@link BluetoothSocket} is thread 70 * safe. In particular, {@link #close} will always immediately abort ongoing 71 * operations and close the socket. 72 * 73 * <p class="note"><strong>Note:</strong> 74 * Requires the {@link android.Manifest.permission#BLUETOOTH} permission. 75 * 76 * <div class="special reference"> 77 * <h3>Developer Guides</h3> 78 * <p>For more information about using Bluetooth, read the 79 * <a href="{@docRoot}guide/topics/connectivity/bluetooth.html">Bluetooth</a> developer guide.</p> 80 * </div> 81 * 82 * {@see BluetoothServerSocket} 83 * {@see java.io.InputStream} 84 * {@see java.io.OutputStream} 85 */ 86 public final class BluetoothSocket implements Closeable { 87 private static final String TAG = "BluetoothSocket"; 88 private static final boolean DBG = Log.isLoggable(TAG, Log.DEBUG); 89 private static final boolean VDBG = Log.isLoggable(TAG, Log.VERBOSE); 90 91 /** @hide */ 92 public static final int MAX_RFCOMM_CHANNEL = 30; 93 /*package*/ static final int MAX_L2CAP_PACKAGE_SIZE = 0xFFFF; 94 95 /** RFCOMM socket */ 96 public static final int TYPE_RFCOMM = 1; 97 98 /** SCO socket */ 99 public static final int TYPE_SCO = 2; 100 101 /** L2CAP socket */ 102 public static final int TYPE_L2CAP = 3; 103 104 /*package*/ static final int EBADFD = 77; 105 /*package*/ static final int EADDRINUSE = 98; 106 107 /*package*/ static final int SEC_FLAG_ENCRYPT = 1; 108 /*package*/ static final int SEC_FLAG_AUTH = 1 << 1; 109 /*package*/ static final int BTSOCK_FLAG_NO_SDP = 1 << 2; 110 /*package*/ static final int SEC_FLAG_AUTH_MITM = 1 << 3; 111 /*package*/ static final int SEC_FLAG_AUTH_16_DIGIT = 1 << 4; 112 113 private final int mType; /* one of TYPE_RFCOMM etc */ 114 private BluetoothDevice mDevice; /* remote device */ 115 private String mAddress; /* remote address */ 116 private final boolean mAuth; 117 private final boolean mEncrypt; 118 private final BluetoothInputStream mInputStream; 119 private final BluetoothOutputStream mOutputStream; 120 private final ParcelUuid mUuid; 121 private boolean mExcludeSdp = false; /* when true no SPP SDP record will be created */ 122 private boolean mAuthMitm = false; /* when true Man-in-the-middle protection will be enabled*/ 123 private boolean mMin16DigitPin = false; /* Minimum 16 digit pin for sec mode 2 connections */ 124 private ParcelFileDescriptor mPfd; 125 private LocalSocket mSocket; 126 private InputStream mSocketIS; 127 private OutputStream mSocketOS; 128 private int mPort; /* RFCOMM channel or L2CAP psm */ 129 private int mFd; 130 private String mServiceName; 131 private static int PROXY_CONNECTION_TIMEOUT = 5000; 132 133 private static int SOCK_SIGNAL_SIZE = 20; 134 135 private ByteBuffer mL2capBuffer = null; 136 private int mMaxTxPacketSize = 0; // The l2cap maximum packet size supported by the peer. 137 private int mMaxRxPacketSize = 0; // The l2cap maximum packet size that can be received. 138 139 private enum SocketState { 140 INIT, 141 CONNECTED, 142 LISTENING, 143 CLOSED, 144 } 145 146 /** prevents all native calls after destroyNative() */ 147 private volatile SocketState mSocketState; 148 149 /** protects mSocketState */ 150 //private final ReentrantReadWriteLock mLock; 151 152 /** 153 * Construct a BluetoothSocket. 154 * @param type type of socket 155 * @param fd fd to use for connected socket, or -1 for a new socket 156 * @param auth require the remote device to be authenticated 157 * @param encrypt require the connection to be encrypted 158 * @param device remote device that this socket can connect to 159 * @param port remote port 160 * @param uuid SDP uuid 161 * @throws IOException On error, for example Bluetooth not available, or 162 * insufficient privileges 163 */ BluetoothSocket(int type, int fd, boolean auth, boolean encrypt, BluetoothDevice device, int port, ParcelUuid uuid)164 /*package*/ BluetoothSocket(int type, int fd, boolean auth, boolean encrypt, 165 BluetoothDevice device, int port, ParcelUuid uuid) throws IOException { 166 this(type, fd, auth, encrypt, device, port, uuid, false, false); 167 } 168 169 /** 170 * Construct a BluetoothSocket. 171 * @param type type of socket 172 * @param fd fd to use for connected socket, or -1 for a new socket 173 * @param auth require the remote device to be authenticated 174 * @param encrypt require the connection to be encrypted 175 * @param device remote device that this socket can connect to 176 * @param port remote port 177 * @param uuid SDP uuid 178 * @param mitm enforce man-in-the-middle protection. 179 * @param min16DigitPin enforce a minimum length of 16 digits for a sec mode 2 connection 180 * @throws IOException On error, for example Bluetooth not available, or 181 * insufficient privileges 182 */ BluetoothSocket(int type, int fd, boolean auth, boolean encrypt, BluetoothDevice device, int port, ParcelUuid uuid, boolean mitm, boolean min16DigitPin)183 /*package*/ BluetoothSocket(int type, int fd, boolean auth, boolean encrypt, 184 BluetoothDevice device, int port, ParcelUuid uuid, boolean mitm, boolean min16DigitPin) 185 throws IOException { 186 if (VDBG) Log.d(TAG, "Creating new BluetoothSocket of type: " + type); 187 if (type == BluetoothSocket.TYPE_RFCOMM && uuid == null && fd == -1 188 && port != BluetoothAdapter.SOCKET_CHANNEL_AUTO_STATIC_NO_SDP) { 189 if (port < 1 || port > MAX_RFCOMM_CHANNEL) { 190 throw new IOException("Invalid RFCOMM channel: " + port); 191 } 192 } 193 if (uuid != null) 194 mUuid = uuid; 195 else mUuid = new ParcelUuid(new UUID(0, 0)); 196 mType = type; 197 mAuth = auth; 198 mAuthMitm = mitm; 199 mMin16DigitPin = min16DigitPin; 200 mEncrypt = encrypt; 201 mDevice = device; 202 mPort = port; 203 mFd = fd; 204 205 mSocketState = SocketState.INIT; 206 207 if (device == null) { 208 // Server socket 209 mAddress = BluetoothAdapter.getDefaultAdapter().getAddress(); 210 } else { 211 // Remote socket 212 mAddress = device.getAddress(); 213 } 214 mInputStream = new BluetoothInputStream(this); 215 mOutputStream = new BluetoothOutputStream(this); 216 } BluetoothSocket(BluetoothSocket s)217 private BluetoothSocket(BluetoothSocket s) { 218 if (VDBG) Log.d(TAG, "Creating new Private BluetoothSocket of type: " + s.mType); 219 mUuid = s.mUuid; 220 mType = s.mType; 221 mAuth = s.mAuth; 222 mEncrypt = s.mEncrypt; 223 mPort = s.mPort; 224 mInputStream = new BluetoothInputStream(this); 225 mOutputStream = new BluetoothOutputStream(this); 226 mMaxRxPacketSize = s.mMaxRxPacketSize; 227 mMaxTxPacketSize = s.mMaxTxPacketSize; 228 229 mServiceName = s.mServiceName; 230 mExcludeSdp = s.mExcludeSdp; 231 mAuthMitm = s.mAuthMitm; 232 mMin16DigitPin = s.mMin16DigitPin; 233 } acceptSocket(String RemoteAddr)234 private BluetoothSocket acceptSocket(String RemoteAddr) throws IOException { 235 BluetoothSocket as = new BluetoothSocket(this); 236 as.mSocketState = SocketState.CONNECTED; 237 FileDescriptor[] fds = mSocket.getAncillaryFileDescriptors(); 238 if (DBG) Log.d(TAG, "socket fd passed by stack fds: " + Arrays.toString(fds)); 239 if(fds == null || fds.length != 1) { 240 Log.e(TAG, "socket fd passed from stack failed, fds: " + Arrays.toString(fds)); 241 as.close(); 242 throw new IOException("bt socket acept failed"); 243 } 244 245 as.mPfd = new ParcelFileDescriptor(fds[0]); 246 as.mSocket = LocalSocket.createConnectedLocalSocket(fds[0]); 247 as.mSocketIS = as.mSocket.getInputStream(); 248 as.mSocketOS = as.mSocket.getOutputStream(); 249 as.mAddress = RemoteAddr; 250 as.mDevice = BluetoothAdapter.getDefaultAdapter().getRemoteDevice(RemoteAddr); 251 return as; 252 } 253 /** 254 * Construct a BluetoothSocket from address. Used by native code. 255 * @param type type of socket 256 * @param fd fd to use for connected socket, or -1 for a new socket 257 * @param auth require the remote device to be authenticated 258 * @param encrypt require the connection to be encrypted 259 * @param address remote device that this socket can connect to 260 * @param port remote port 261 * @throws IOException On error, for example Bluetooth not available, or 262 * insufficient privileges 263 */ BluetoothSocket(int type, int fd, boolean auth, boolean encrypt, String address, int port)264 private BluetoothSocket(int type, int fd, boolean auth, boolean encrypt, String address, 265 int port) throws IOException { 266 this(type, fd, auth, encrypt, new BluetoothDevice(address), port, null, false, false); 267 } 268 269 /** @hide */ 270 @Override finalize()271 protected void finalize() throws Throwable { 272 try { 273 close(); 274 } finally { 275 super.finalize(); 276 } 277 } getSecurityFlags()278 private int getSecurityFlags() { 279 int flags = 0; 280 if(mAuth) 281 flags |= SEC_FLAG_AUTH; 282 if(mEncrypt) 283 flags |= SEC_FLAG_ENCRYPT; 284 if(mExcludeSdp) 285 flags |= BTSOCK_FLAG_NO_SDP; 286 if(mAuthMitm) 287 flags |= SEC_FLAG_AUTH_MITM; 288 if(mMin16DigitPin) 289 flags |= SEC_FLAG_AUTH_16_DIGIT; 290 return flags; 291 } 292 293 /** 294 * Get the remote device this socket is connecting, or connected, to. 295 * @return remote device 296 */ getRemoteDevice()297 public BluetoothDevice getRemoteDevice() { 298 return mDevice; 299 } 300 301 /** 302 * Get the input stream associated with this socket. 303 * <p>The input stream will be returned even if the socket is not yet 304 * connected, but operations on that stream will throw IOException until 305 * the associated socket is connected. 306 * @return InputStream 307 */ getInputStream()308 public InputStream getInputStream() throws IOException { 309 return mInputStream; 310 } 311 312 /** 313 * Get the output stream associated with this socket. 314 * <p>The output stream will be returned even if the socket is not yet 315 * connected, but operations on that stream will throw IOException until 316 * the associated socket is connected. 317 * @return OutputStream 318 */ getOutputStream()319 public OutputStream getOutputStream() throws IOException { 320 return mOutputStream; 321 } 322 323 /** 324 * Get the connection status of this socket, ie, whether there is an active connection with 325 * remote device. 326 * @return true if connected 327 * false if not connected 328 */ isConnected()329 public boolean isConnected() { 330 return mSocketState == SocketState.CONNECTED; 331 } 332 setServiceName(String name)333 /*package*/ void setServiceName(String name) { 334 mServiceName = name; 335 } 336 337 /** 338 * Attempt to connect to a remote device. 339 * <p>This method will block until a connection is made or the connection 340 * fails. If this method returns without an exception then this socket 341 * is now connected. 342 * <p>Creating new connections to 343 * remote Bluetooth devices should not be attempted while device discovery 344 * is in progress. Device discovery is a heavyweight procedure on the 345 * Bluetooth adapter and will significantly slow a device connection. 346 * Use {@link BluetoothAdapter#cancelDiscovery()} to cancel an ongoing 347 * discovery. Discovery is not managed by the Activity, 348 * but is run as a system service, so an application should always call 349 * {@link BluetoothAdapter#cancelDiscovery()} even if it 350 * did not directly request a discovery, just to be sure. 351 * <p>{@link #close} can be used to abort this call from another thread. 352 * @throws IOException on error, for example connection failure 353 */ connect()354 public void connect() throws IOException { 355 if (mDevice == null) throw new IOException("Connect is called on null device"); 356 357 try { 358 if (mSocketState == SocketState.CLOSED) throw new IOException("socket closed"); 359 IBluetooth bluetoothProxy = 360 BluetoothAdapter.getDefaultAdapter().getBluetoothService(null); 361 if (bluetoothProxy == null) throw new IOException("Bluetooth is off"); 362 mPfd = bluetoothProxy.connectSocket(mDevice, mType, 363 mUuid, mPort, getSecurityFlags()); 364 synchronized(this) 365 { 366 if (DBG) Log.d(TAG, "connect(), SocketState: " + mSocketState + ", mPfd: " + mPfd); 367 if (mSocketState == SocketState.CLOSED) throw new IOException("socket closed"); 368 if (mPfd == null) throw new IOException("bt socket connect failed"); 369 FileDescriptor fd = mPfd.getFileDescriptor(); 370 mSocket = LocalSocket.createConnectedLocalSocket(fd); 371 mSocketIS = mSocket.getInputStream(); 372 mSocketOS = mSocket.getOutputStream(); 373 } 374 int channel = readInt(mSocketIS); 375 if (channel <= 0) 376 throw new IOException("bt socket connect failed"); 377 mPort = channel; 378 waitSocketSignal(mSocketIS); 379 synchronized(this) 380 { 381 if (mSocketState == SocketState.CLOSED) 382 throw new IOException("bt socket closed"); 383 mSocketState = SocketState.CONNECTED; 384 } 385 } catch (RemoteException e) { 386 Log.e(TAG, Log.getStackTraceString(new Throwable())); 387 throw new IOException("unable to send RPC: " + e.getMessage()); 388 } 389 } 390 391 /** 392 * Currently returns unix errno instead of throwing IOException, 393 * so that BluetoothAdapter can check the error code for EADDRINUSE 394 */ bindListen()395 /*package*/ int bindListen() { 396 int ret; 397 if (mSocketState == SocketState.CLOSED) return EBADFD; 398 IBluetooth bluetoothProxy = BluetoothAdapter.getDefaultAdapter().getBluetoothService(null); 399 if (bluetoothProxy == null) { 400 Log.e(TAG, "bindListen fail, reason: bluetooth is off"); 401 return -1; 402 } 403 try { 404 mPfd = bluetoothProxy.createSocketChannel(mType, mServiceName, 405 mUuid, mPort, getSecurityFlags()); 406 } catch (RemoteException e) { 407 Log.e(TAG, Log.getStackTraceString(new Throwable())); 408 return -1; 409 } 410 411 // read out port number 412 try { 413 synchronized(this) { 414 if (DBG) Log.d(TAG, "bindListen(), SocketState: " + mSocketState + ", mPfd: " + 415 mPfd); 416 if(mSocketState != SocketState.INIT) return EBADFD; 417 if(mPfd == null) return -1; 418 FileDescriptor fd = mPfd.getFileDescriptor(); 419 if (fd == null) { 420 Log.e(TAG, "bindListen(), null file descriptor"); 421 return -1; 422 } 423 424 if (DBG) Log.d(TAG, "bindListen(), Create LocalSocket"); 425 mSocket = LocalSocket.createConnectedLocalSocket(fd); 426 if (DBG) Log.d(TAG, "bindListen(), new LocalSocket.getInputStream()"); 427 mSocketIS = mSocket.getInputStream(); 428 mSocketOS = mSocket.getOutputStream(); 429 } 430 if (DBG) Log.d(TAG, "bindListen(), readInt mSocketIS: " + mSocketIS); 431 int channel = readInt(mSocketIS); 432 synchronized(this) { 433 if(mSocketState == SocketState.INIT) 434 mSocketState = SocketState.LISTENING; 435 } 436 if (DBG) Log.d(TAG, "channel: " + channel); 437 if (mPort <= -1) { 438 mPort = channel; 439 } // else ASSERT(mPort == channel) 440 ret = 0; 441 } catch (IOException e) { 442 if (mPfd != null) { 443 try { 444 mPfd.close(); 445 } catch (IOException e1) { 446 Log.e(TAG, "bindListen, close mPfd: " + e1); 447 } 448 mPfd = null; 449 } 450 Log.e(TAG, "bindListen, fail to get port number, exception: " + e); 451 return -1; 452 } 453 return ret; 454 } 455 accept(int timeout)456 /*package*/ BluetoothSocket accept(int timeout) throws IOException { 457 BluetoothSocket acceptedSocket; 458 if (mSocketState != SocketState.LISTENING) 459 throw new IOException("bt socket is not in listen state"); 460 if(timeout > 0) { 461 Log.d(TAG, "accept() set timeout (ms):" + timeout); 462 mSocket.setSoTimeout(timeout); 463 } 464 String RemoteAddr = waitSocketSignal(mSocketIS); 465 if(timeout > 0) 466 mSocket.setSoTimeout(0); 467 synchronized(this) 468 { 469 if (mSocketState != SocketState.LISTENING) 470 throw new IOException("bt socket is not in listen state"); 471 acceptedSocket = acceptSocket(RemoteAddr); 472 //quick drop the reference of the file handle 473 } 474 return acceptedSocket; 475 } 476 available()477 /*package*/ int available() throws IOException { 478 if (VDBG) Log.d(TAG, "available: " + mSocketIS); 479 return mSocketIS.available(); 480 } 481 /** 482 * Wait until the data in sending queue is emptied. A polling version 483 * for flush implementation. Used to ensure the writing data afterwards will 484 * be packed in new RFCOMM frame. 485 * @throws IOException 486 * if an i/o error occurs. 487 */ flush()488 /*package*/ void flush() throws IOException { 489 if (mSocketOS == null) throw new IOException("flush is called on null OutputStream"); 490 if (VDBG) Log.d(TAG, "flush: " + mSocketOS); 491 mSocketOS.flush(); 492 } 493 read(byte[] b, int offset, int length)494 /*package*/ int read(byte[] b, int offset, int length) throws IOException { 495 int ret = 0; 496 if (VDBG) Log.d(TAG, "read in: " + mSocketIS + " len: " + length); 497 if(mType == TYPE_L2CAP) 498 { 499 int bytesToRead = length; 500 if (VDBG) Log.v(TAG, "l2cap: read(): offset: " + offset + " length:" + length 501 + "mL2capBuffer= " + mL2capBuffer); 502 if (mL2capBuffer == null) { 503 createL2capRxBuffer(); 504 } 505 if (mL2capBuffer.remaining() == 0) { 506 if (VDBG) Log.v(TAG, "l2cap buffer empty, refilling..."); 507 if (fillL2capRxBuffer() == -1) { 508 return -1; 509 } 510 } 511 if (bytesToRead > mL2capBuffer.remaining()) { 512 bytesToRead = mL2capBuffer.remaining(); 513 } 514 if(VDBG) Log.v(TAG, "get(): offset: " + offset 515 + " bytesToRead: " + bytesToRead); 516 mL2capBuffer.get(b, offset, bytesToRead); 517 ret = bytesToRead; 518 }else { 519 if (VDBG) Log.v(TAG, "default: read(): offset: " + offset + " length:" + length); 520 ret = mSocketIS.read(b, offset, length); 521 } 522 if (ret < 0) 523 throw new IOException("bt socket closed, read return: " + ret); 524 if (VDBG) Log.d(TAG, "read out: " + mSocketIS + " ret: " + ret); 525 return ret; 526 } 527 write(byte[] b, int offset, int length)528 /*package*/ int write(byte[] b, int offset, int length) throws IOException { 529 530 //TODO: Since bindings can exist between the SDU size and the 531 // protocol, we might need to throw an exception instead of just 532 // splitting the write into multiple smaller writes. 533 // Rfcomm uses dynamic allocation, and should not have any bindings 534 // to the actual message length. 535 if (VDBG) Log.d(TAG, "write: " + mSocketOS + " length: " + length); 536 if (mType == TYPE_L2CAP) { 537 if(length <= mMaxTxPacketSize) { 538 mSocketOS.write(b, offset, length); 539 } else { 540 if(DBG) Log.w(TAG, "WARNING: Write buffer larger than L2CAP packet size!\n" 541 + "Packet will be divided into SDU packets of size " 542 + mMaxTxPacketSize); 543 int tmpOffset = offset; 544 int bytesToWrite = length; 545 while (bytesToWrite > 0) { 546 int tmpLength = (bytesToWrite > mMaxTxPacketSize) 547 ? mMaxTxPacketSize 548 : bytesToWrite; 549 mSocketOS.write(b, tmpOffset, tmpLength); 550 tmpOffset += tmpLength; 551 bytesToWrite -= tmpLength; 552 } 553 } 554 } else { 555 mSocketOS.write(b, offset, length); 556 } 557 // There is no good way to confirm since the entire process is asynchronous anyway 558 if (VDBG) Log.d(TAG, "write out: " + mSocketOS + " length: " + length); 559 return length; 560 } 561 562 @Override close()563 public void close() throws IOException { 564 Log.d(TAG, "close() this: " + this + ", channel: " + mPort + 565 ", mSocketIS: " + mSocketIS + ", mSocketOS: " + mSocketOS + 566 "mSocket: " + mSocket + ", mSocketState: " + mSocketState); 567 if(mSocketState == SocketState.CLOSED) 568 return; 569 else 570 { 571 synchronized(this) 572 { 573 if(mSocketState == SocketState.CLOSED) 574 return; 575 mSocketState = SocketState.CLOSED; 576 if(mSocket != null) { 577 if (DBG) Log.d(TAG, "Closing mSocket: " + mSocket); 578 mSocket.shutdownInput(); 579 mSocket.shutdownOutput(); 580 mSocket.close(); 581 mSocket = null; 582 } 583 if (mPfd != null) { 584 mPfd.close(); 585 mPfd = null; 586 } 587 } 588 } 589 } 590 removeChannel()591 /*package */ void removeChannel() { 592 } 593 getPort()594 /*package */ int getPort() { 595 return mPort; 596 } 597 598 /** 599 * Get the maximum supported Transmit packet size for the underlying transport. 600 * Use this to optimize the writes done to the output socket, to avoid sending 601 * half full packets. 602 * @return the maximum supported Transmit packet size for the underlying transport. 603 */ getMaxTransmitPacketSize()604 public int getMaxTransmitPacketSize(){ 605 return mMaxTxPacketSize; 606 } 607 608 /** 609 * Get the maximum supported Receive packet size for the underlying transport. 610 * Use this to optimize the reads done on the input stream, as any call to read 611 * will return a maximum of this amount of bytes - or for some transports a 612 * multiple of this value. 613 * @return the maximum supported Receive packet size for the underlying transport. 614 */ getMaxReceivePacketSize()615 public int getMaxReceivePacketSize(){ 616 return mMaxRxPacketSize; 617 } 618 619 /** 620 * Get the type of the underlying connection. 621 * @return one of {@link #TYPE_RFCOMM}, {@link #TYPE_SCO} or {@link #TYPE_L2CAP} 622 */ getConnectionType()623 public int getConnectionType() { 624 return mType; 625 } 626 627 /** 628 * Change if a SDP entry should be automatically created. 629 * Must be called before calling .bind, for the call to have any effect. 630 * @param mExcludeSdp <li>TRUE - do not auto generate SDP record. 631 * <li>FALSE - default - auto generate SPP SDP record. 632 * @hide 633 */ setExcludeSdp(boolean excludeSdp)634 public void setExcludeSdp(boolean excludeSdp) { 635 this.mExcludeSdp = excludeSdp; 636 } 637 convertAddr(final byte[] addr)638 private String convertAddr(final byte[] addr) { 639 return String.format(Locale.US, "%02X:%02X:%02X:%02X:%02X:%02X", 640 addr[0] , addr[1], addr[2], addr[3] , addr[4], addr[5]); 641 } waitSocketSignal(InputStream is)642 private String waitSocketSignal(InputStream is) throws IOException { 643 byte [] sig = new byte[SOCK_SIGNAL_SIZE]; 644 int ret = readAll(is, sig); 645 if (VDBG) Log.d(TAG, "waitSocketSignal read " + SOCK_SIGNAL_SIZE + 646 " bytes signal ret: " + ret); 647 ByteBuffer bb = ByteBuffer.wrap(sig); 648 /* the struct in native is decorated with __attribute__((packed)), hence this is possible */ 649 bb.order(ByteOrder.nativeOrder()); 650 int size = bb.getShort(); 651 if(size != SOCK_SIGNAL_SIZE) 652 throw new IOException("Connection failure, wrong signal size: " + size); 653 byte [] addr = new byte[6]; 654 bb.get(addr); 655 int channel = bb.getInt(); 656 int status = bb.getInt(); 657 mMaxTxPacketSize = (bb.getShort() & 0xffff); // Convert to unsigned value 658 mMaxRxPacketSize = (bb.getShort() & 0xffff); // Convert to unsigned value 659 String RemoteAddr = convertAddr(addr); 660 if (VDBG) Log.d(TAG, "waitSocketSignal: sig size: " + size + ", remote addr: " 661 + RemoteAddr + ", channel: " + channel + ", status: " + status 662 + " MaxRxPktSize: " + mMaxRxPacketSize + " MaxTxPktSize: " + mMaxTxPacketSize); 663 if(status != 0) 664 throw new IOException("Connection failure, status: " + status); 665 return RemoteAddr; 666 } 667 createL2capRxBuffer()668 private void createL2capRxBuffer(){ 669 if(mType == TYPE_L2CAP) { 670 // Allocate the buffer to use for reads. 671 if(VDBG) Log.v(TAG, " Creating mL2capBuffer: mMaxPacketSize: " + mMaxRxPacketSize); 672 mL2capBuffer = ByteBuffer.wrap(new byte[mMaxRxPacketSize]); 673 if(VDBG) Log.v(TAG, "mL2capBuffer.remaining()" + mL2capBuffer.remaining()); 674 mL2capBuffer.limit(0); // Ensure we do a real read at the first read-request 675 if(VDBG) Log.v(TAG, "mL2capBuffer.remaining() after limit(0):" + 676 mL2capBuffer.remaining()); 677 } 678 } 679 readAll(InputStream is, byte[] b)680 private int readAll(InputStream is, byte[] b) throws IOException { 681 int left = b.length; 682 while(left > 0) { 683 int ret = is.read(b, b.length - left, left); 684 if(ret <= 0) 685 throw new IOException("read failed, socket might closed or timeout, read ret: " 686 + ret); 687 left -= ret; 688 if(left != 0) 689 Log.w(TAG, "readAll() looping, read partial size: " + (b.length - left) + 690 ", expect size: " + b.length); 691 } 692 return b.length; 693 } 694 readInt(InputStream is)695 private int readInt(InputStream is) throws IOException { 696 byte[] ibytes = new byte[4]; 697 int ret = readAll(is, ibytes); 698 if (VDBG) Log.d(TAG, "inputStream.read ret: " + ret); 699 ByteBuffer bb = ByteBuffer.wrap(ibytes); 700 bb.order(ByteOrder.nativeOrder()); 701 return bb.getInt(); 702 } 703 fillL2capRxBuffer()704 private int fillL2capRxBuffer() throws IOException { 705 mL2capBuffer.rewind(); 706 int ret = mSocketIS.read(mL2capBuffer.array()); 707 if(ret == -1) { 708 // reached end of stream - return -1 709 mL2capBuffer.limit(0); 710 return -1; 711 } 712 mL2capBuffer.limit(ret); 713 return ret; 714 } 715 716 717 } 718