| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.bluetooth; |
| |
| import android.os.IBinder; |
| import android.os.ParcelUuid; |
| import android.os.ParcelFileDescriptor; |
| import android.os.RemoteException; |
| import android.os.ServiceManager; |
| 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.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.List; |
| import java.util.Locale; |
| import java.util.UUID; |
| import android.net.LocalSocket; |
| import java.nio.ByteOrder; |
| import java.nio.ByteBuffer; |
| /** |
| * A connected or connecting Bluetooth socket. |
| * |
| * <p>The interface for Bluetooth Sockets is similar to that of TCP sockets: |
| * {@link java.net.Socket} and {@link java.net.ServerSocket}. On the server |
| * side, use a {@link BluetoothServerSocket} to create a listening server |
| * socket. When a connection is accepted by the {@link BluetoothServerSocket}, |
| * it will return a new {@link BluetoothSocket} to manage the connection. |
| * On the client side, use a single {@link BluetoothSocket} to both initiate |
| * an outgoing connection and to manage the connection. |
| * |
| * <p>The most common type of Bluetooth socket is RFCOMM, which is the type |
| * supported by the Android APIs. RFCOMM is a connection-oriented, streaming |
| * transport over Bluetooth. It is also known as the Serial Port Profile (SPP). |
| * |
| * <p>To create a {@link BluetoothSocket} for connecting to a known device, use |
| * {@link BluetoothDevice#createRfcommSocketToServiceRecord |
| * BluetoothDevice.createRfcommSocketToServiceRecord()}. |
| * Then call {@link #connect()} to attempt a connection to the remote device. |
| * This call will block until a connection is established or the connection |
| * fails. |
| * |
| * <p>To create a {@link BluetoothSocket} as a server (or "host"), see the |
| * {@link BluetoothServerSocket} documentation. |
| * |
| * <p>Once the socket is connected, whether initiated as a client or accepted |
| * as a server, open the IO streams by calling {@link #getInputStream} and |
| * {@link #getOutputStream} in order to retrieve {@link java.io.InputStream} |
| * and {@link java.io.OutputStream} objects, respectively, which are |
| * automatically connected to the socket. |
| * |
| * <p>{@link BluetoothSocket} is thread |
| * safe. In particular, {@link #close} will always immediately abort ongoing |
| * operations and close the socket. |
| * |
| * <p class="note"><strong>Note:</strong> |
| * Requires the {@link android.Manifest.permission#BLUETOOTH} permission. |
| * |
| * <div class="special reference"> |
| * <h3>Developer Guides</h3> |
| * <p>For more information about using Bluetooth, read the |
| * <a href="{@docRoot}guide/topics/wireless/bluetooth.html">Bluetooth</a> developer guide.</p> |
| * </div> |
| * |
| * {@see BluetoothServerSocket} |
| * {@see java.io.InputStream} |
| * {@see java.io.OutputStream} |
| */ |
| public final class BluetoothSocket implements Closeable { |
| private static final String TAG = "BluetoothSocket"; |
| private static final boolean DBG = true; |
| private static final boolean VDBG = false; |
| |
| /** @hide */ |
| public static final int MAX_RFCOMM_CHANNEL = 30; |
| |
| /** Keep TYPE_ fields in sync with BluetoothSocket.cpp */ |
| /*package*/ static final int TYPE_RFCOMM = 1; |
| /*package*/ static final int TYPE_SCO = 2; |
| /*package*/ static final int TYPE_L2CAP = 3; |
| |
| /*package*/ static final int EBADFD = 77; |
| /*package*/ static final int EADDRINUSE = 98; |
| |
| /*package*/ static final int SEC_FLAG_ENCRYPT = 1; |
| /*package*/ static final int SEC_FLAG_AUTH = 1 << 1; |
| |
| private final int mType; /* one of TYPE_RFCOMM etc */ |
| private BluetoothDevice mDevice; /* remote device */ |
| private String mAddress; /* remote address */ |
| private final boolean mAuth; |
| private final boolean mEncrypt; |
| private final BluetoothInputStream mInputStream; |
| private final BluetoothOutputStream mOutputStream; |
| private final ParcelUuid mUuid; |
| private ParcelFileDescriptor mPfd; |
| private LocalSocket mSocket; |
| private InputStream mSocketIS; |
| private OutputStream mSocketOS; |
| private int mPort; /* RFCOMM channel or L2CAP psm */ |
| private int mFd; |
| private String mServiceName; |
| private static int PROXY_CONNECTION_TIMEOUT = 5000; |
| |
| private static int SOCK_SIGNAL_SIZE = 16; |
| |
| private enum SocketState { |
| INIT, |
| CONNECTED, |
| LISTENING, |
| CLOSED, |
| } |
| |
| /** prevents all native calls after destroyNative() */ |
| private volatile SocketState mSocketState; |
| |
| /** protects mSocketState */ |
| //private final ReentrantReadWriteLock mLock; |
| |
| /** |
| * Construct a BluetoothSocket. |
| * @param type type of socket |
| * @param fd fd to use for connected socket, or -1 for a new socket |
| * @param auth require the remote device to be authenticated |
| * @param encrypt require the connection to be encrypted |
| * @param device remote device that this socket can connect to |
| * @param port remote port |
| * @param uuid SDP uuid |
| * @throws IOException On error, for example Bluetooth not available, or |
| * insufficient privileges |
| */ |
| /*package*/ BluetoothSocket(int type, int fd, boolean auth, boolean encrypt, |
| BluetoothDevice device, int port, ParcelUuid uuid) throws IOException { |
| if (type == BluetoothSocket.TYPE_RFCOMM && uuid == null && fd == -1) { |
| if (port < 1 || port > MAX_RFCOMM_CHANNEL) { |
| throw new IOException("Invalid RFCOMM channel: " + port); |
| } |
| } |
| if(uuid != null) |
| mUuid = uuid; |
| else mUuid = new ParcelUuid(new UUID(0, 0)); |
| mType = type; |
| mAuth = auth; |
| mEncrypt = encrypt; |
| mDevice = device; |
| mPort = port; |
| mFd = fd; |
| |
| mSocketState = SocketState.INIT; |
| |
| if (device == null) { |
| // Server socket |
| mAddress = BluetoothAdapter.getDefaultAdapter().getAddress(); |
| } else { |
| // Remote socket |
| mAddress = device.getAddress(); |
| } |
| mInputStream = new BluetoothInputStream(this); |
| mOutputStream = new BluetoothOutputStream(this); |
| } |
| private BluetoothSocket(BluetoothSocket s) { |
| mUuid = s.mUuid; |
| mType = s.mType; |
| mAuth = s.mAuth; |
| mEncrypt = s.mEncrypt; |
| mPort = s.mPort; |
| mInputStream = new BluetoothInputStream(this); |
| mOutputStream = new BluetoothOutputStream(this); |
| mServiceName = s.mServiceName; |
| } |
| private BluetoothSocket acceptSocket(String RemoteAddr) throws IOException { |
| BluetoothSocket as = new BluetoothSocket(this); |
| as.mSocketState = SocketState.CONNECTED; |
| FileDescriptor[] fds = mSocket.getAncillaryFileDescriptors(); |
| if (VDBG) Log.d(TAG, "socket fd passed by stack fds: " + fds); |
| if(fds == null || fds.length != 1) { |
| Log.e(TAG, "socket fd passed from stack failed, fds: " + fds); |
| as.close(); |
| throw new IOException("bt socket acept failed"); |
| } |
| as.mSocket = new LocalSocket(fds[0]); |
| as.mSocketIS = as.mSocket.getInputStream(); |
| as.mSocketOS = as.mSocket.getOutputStream(); |
| as.mAddress = RemoteAddr; |
| as.mDevice = BluetoothAdapter.getDefaultAdapter().getRemoteDevice(RemoteAddr); |
| return as; |
| } |
| /** |
| * Construct a BluetoothSocket from address. Used by native code. |
| * @param type type of socket |
| * @param fd fd to use for connected socket, or -1 for a new socket |
| * @param auth require the remote device to be authenticated |
| * @param encrypt require the connection to be encrypted |
| * @param address remote device that this socket can connect to |
| * @param port remote port |
| * @throws IOException On error, for example Bluetooth not available, or |
| * insufficient privileges |
| */ |
| private BluetoothSocket(int type, int fd, boolean auth, boolean encrypt, String address, |
| int port) throws IOException { |
| this(type, fd, auth, encrypt, new BluetoothDevice(address), port, null); |
| } |
| |
| /** @hide */ |
| @Override |
| protected void finalize() throws Throwable { |
| try { |
| close(); |
| } finally { |
| super.finalize(); |
| } |
| } |
| private int getSecurityFlags() { |
| int flags = 0; |
| if(mAuth) |
| flags |= SEC_FLAG_AUTH; |
| if(mEncrypt) |
| flags |= SEC_FLAG_ENCRYPT; |
| return flags; |
| } |
| |
| /** |
| * Get the remote device this socket is connecting, or connected, to. |
| * @return remote device |
| */ |
| public BluetoothDevice getRemoteDevice() { |
| return mDevice; |
| } |
| |
| /** |
| * Get the input stream associated with this socket. |
| * <p>The input stream will be returned even if the socket is not yet |
| * connected, but operations on that stream will throw IOException until |
| * the associated socket is connected. |
| * @return InputStream |
| */ |
| public InputStream getInputStream() throws IOException { |
| return mInputStream; |
| } |
| |
| /** |
| * Get the output stream associated with this socket. |
| * <p>The output stream will be returned even if the socket is not yet |
| * connected, but operations on that stream will throw IOException until |
| * the associated socket is connected. |
| * @return OutputStream |
| */ |
| public OutputStream getOutputStream() throws IOException { |
| return mOutputStream; |
| } |
| |
| /** |
| * Get the connection status of this socket, ie, whether there is an active connection with |
| * remote device. |
| * @return true if connected |
| * false if not connected |
| */ |
| public boolean isConnected() { |
| return mSocketState == SocketState.CONNECTED; |
| } |
| |
| /*package*/ void setServiceName(String name) { |
| mServiceName = name; |
| } |
| |
| /** |
| * Attempt to connect to a remote device. |
| * <p>This method will block until a connection is made or the connection |
| * fails. If this method returns without an exception then this socket |
| * is now connected. |
| * <p>Creating new connections to |
| * remote Bluetooth devices should not be attempted while device discovery |
| * is in progress. Device discovery is a heavyweight procedure on the |
| * Bluetooth adapter and will significantly slow a device connection. |
| * Use {@link BluetoothAdapter#cancelDiscovery()} to cancel an ongoing |
| * discovery. Discovery is not managed by the Activity, |
| * but is run as a system service, so an application should always call |
| * {@link BluetoothAdapter#cancelDiscovery()} even if it |
| * did not directly request a discovery, just to be sure. |
| * <p>{@link #close} can be used to abort this call from another thread. |
| * @throws IOException on error, for example connection failure |
| */ |
| public void connect() throws IOException { |
| if (mDevice == null) throw new IOException("Connect is called on null device"); |
| |
| try { |
| if (mSocketState == SocketState.CLOSED) throw new IOException("socket closed"); |
| IBluetooth bluetoothProxy = BluetoothAdapter.getDefaultAdapter().getBluetoothService(null); |
| if (bluetoothProxy == null) throw new IOException("Bluetooth is off"); |
| mPfd = bluetoothProxy.connectSocket(mDevice, mType, |
| mUuid, mPort, getSecurityFlags()); |
| synchronized(this) |
| { |
| if (DBG) Log.d(TAG, "connect(), SocketState: " + mSocketState + ", mPfd: " + mPfd); |
| if (mSocketState == SocketState.CLOSED) throw new IOException("socket closed"); |
| if (mPfd == null) throw new IOException("bt socket connect failed"); |
| FileDescriptor fd = mPfd.getFileDescriptor(); |
| mSocket = new LocalSocket(fd); |
| mSocketIS = mSocket.getInputStream(); |
| mSocketOS = mSocket.getOutputStream(); |
| } |
| int channel = readInt(mSocketIS); |
| if (channel <= 0) |
| throw new IOException("bt socket connect failed"); |
| mPort = channel; |
| waitSocketSignal(mSocketIS); |
| synchronized(this) |
| { |
| if (mSocketState == SocketState.CLOSED) |
| throw new IOException("bt socket closed"); |
| mSocketState = SocketState.CONNECTED; |
| } |
| } catch (RemoteException e) { |
| Log.e(TAG, Log.getStackTraceString(new Throwable())); |
| } |
| } |
| |
| /** |
| * Currently returns unix errno instead of throwing IOException, |
| * so that BluetoothAdapter can check the error code for EADDRINUSE |
| */ |
| /*package*/ int bindListen() { |
| int ret; |
| if (mSocketState == SocketState.CLOSED) return EBADFD; |
| IBluetooth bluetoothProxy = BluetoothAdapter.getDefaultAdapter().getBluetoothService(null); |
| if (bluetoothProxy == null) { |
| Log.e(TAG, "bindListen fail, reason: bluetooth is off"); |
| return -1; |
| } |
| try { |
| mPfd = bluetoothProxy.createSocketChannel(mType, mServiceName, |
| mUuid, mPort, getSecurityFlags()); |
| } catch (RemoteException e) { |
| Log.e(TAG, Log.getStackTraceString(new Throwable())); |
| return -1; |
| } |
| |
| // read out port number |
| try { |
| synchronized(this) { |
| if (VDBG) Log.d(TAG, "bindListen(), SocketState: " + mSocketState + ", mPfd: " + |
| mPfd); |
| if(mSocketState != SocketState.INIT) return EBADFD; |
| if(mPfd == null) return -1; |
| FileDescriptor fd = mPfd.getFileDescriptor(); |
| if (VDBG) Log.d(TAG, "bindListen(), new LocalSocket "); |
| mSocket = new LocalSocket(fd); |
| if (VDBG) Log.d(TAG, "bindListen(), new LocalSocket.getInputStream() "); |
| mSocketIS = mSocket.getInputStream(); |
| mSocketOS = mSocket.getOutputStream(); |
| } |
| if (VDBG) Log.d(TAG, "bindListen(), readInt mSocketIS: " + mSocketIS); |
| int channel = readInt(mSocketIS); |
| synchronized(this) { |
| if(mSocketState == SocketState.INIT) |
| mSocketState = SocketState.LISTENING; |
| } |
| if (VDBG) Log.d(TAG, "channel: " + channel); |
| if (mPort == -1) { |
| mPort = channel; |
| } // else ASSERT(mPort == channel) |
| ret = 0; |
| } catch (IOException e) { |
| Log.e(TAG, "bindListen, fail to get port number, exception: " + e); |
| return -1; |
| } |
| return ret; |
| } |
| |
| /*package*/ BluetoothSocket accept(int timeout) throws IOException { |
| BluetoothSocket acceptedSocket; |
| if (mSocketState != SocketState.LISTENING) throw new IOException("bt socket is not in listen state"); |
| if(timeout > 0) { |
| Log.d(TAG, "accept() set timeout (ms):" + timeout); |
| mSocket.setSoTimeout(timeout); |
| } |
| String RemoteAddr = waitSocketSignal(mSocketIS); |
| if(timeout > 0) |
| mSocket.setSoTimeout(0); |
| synchronized(this) |
| { |
| if (mSocketState != SocketState.LISTENING) |
| throw new IOException("bt socket is not in listen state"); |
| acceptedSocket = acceptSocket(RemoteAddr); |
| //quick drop the reference of the file handle |
| } |
| return acceptedSocket; |
| } |
| |
| /*package*/ int available() throws IOException { |
| if (VDBG) Log.d(TAG, "available: " + mSocketIS); |
| return mSocketIS.available(); |
| } |
| /** |
| * Wait until the data in sending queue is emptied. A polling version |
| * for flush implementation. Used to ensure the writing data afterwards will |
| * be packed in new RFCOMM frame. |
| * @throws IOException |
| * if an i/o error occurs. |
| */ |
| /*package*/ void flush() throws IOException { |
| if (VDBG) Log.d(TAG, "flush: " + mSocketOS); |
| mSocketOS.flush(); |
| } |
| |
| /*package*/ int read(byte[] b, int offset, int length) throws IOException { |
| |
| if (VDBG) Log.d(TAG, "read in: " + mSocketIS + " len: " + length); |
| int ret = mSocketIS.read(b, offset, length); |
| if(ret < 0) |
| throw new IOException("bt socket closed, read return: " + ret); |
| if (VDBG) Log.d(TAG, "read out: " + mSocketIS + " ret: " + ret); |
| return ret; |
| } |
| |
| /*package*/ int write(byte[] b, int offset, int length) throws IOException { |
| |
| if (VDBG) Log.d(TAG, "write: " + mSocketOS + " length: " + length); |
| mSocketOS.write(b, offset, length); |
| // There is no good way to confirm since the entire process is asynchronous anyway |
| if (VDBG) Log.d(TAG, "write out: " + mSocketOS + " length: " + length); |
| return length; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| if (VDBG) Log.d(TAG, "close() in, this: " + this + ", channel: " + mPort + ", state: " + mSocketState); |
| if(mSocketState == SocketState.CLOSED) |
| return; |
| else |
| { |
| synchronized(this) |
| { |
| if(mSocketState == SocketState.CLOSED) |
| return; |
| mSocketState = SocketState.CLOSED; |
| if (VDBG) Log.d(TAG, "close() this: " + this + ", channel: " + mPort + ", mSocketIS: " + mSocketIS + |
| ", mSocketOS: " + mSocketOS + "mSocket: " + mSocket); |
| if(mSocket != null) { |
| if (VDBG) Log.d(TAG, "Closing mSocket: " + mSocket); |
| mSocket.shutdownInput(); |
| mSocket.shutdownOutput(); |
| mSocket.close(); |
| mSocket = null; |
| } |
| if(mPfd != null) |
| mPfd.detachFd(); |
| } |
| } |
| } |
| |
| /*package */ void removeChannel() { |
| } |
| |
| /*package */ int getPort() { |
| return mPort; |
| } |
| private String convertAddr(final byte[] addr) { |
| return String.format(Locale.US, "%02X:%02X:%02X:%02X:%02X:%02X", |
| addr[0] , addr[1], addr[2], addr[3] , addr[4], addr[5]); |
| } |
| private String waitSocketSignal(InputStream is) throws IOException { |
| byte [] sig = new byte[SOCK_SIGNAL_SIZE]; |
| int ret = readAll(is, sig); |
| if (VDBG) Log.d(TAG, "waitSocketSignal read 16 bytes signal ret: " + ret); |
| ByteBuffer bb = ByteBuffer.wrap(sig); |
| bb.order(ByteOrder.nativeOrder()); |
| int size = bb.getShort(); |
| if(size != SOCK_SIGNAL_SIZE) |
| throw new IOException("Connection failure, wrong signal size: " + size); |
| byte [] addr = new byte[6]; |
| bb.get(addr); |
| int channel = bb.getInt(); |
| int status = bb.getInt(); |
| String RemoteAddr = convertAddr(addr); |
| if (VDBG) Log.d(TAG, "waitSocketSignal: sig size: " + size + ", remote addr: " |
| + RemoteAddr + ", channel: " + channel + ", status: " + status); |
| if(status != 0) |
| throw new IOException("Connection failure, status: " + status); |
| return RemoteAddr; |
| } |
| private int readAll(InputStream is, byte[] b) throws IOException { |
| int left = b.length; |
| while(left > 0) { |
| int ret = is.read(b, b.length - left, left); |
| if(ret <= 0) |
| throw new IOException("read failed, socket might closed or timeout, read ret: " + ret); |
| left -= ret; |
| if(left != 0) |
| Log.w(TAG, "readAll() looping, read partial size: " + (b.length - left) + |
| ", expect size: " + b.length); |
| } |
| return b.length; |
| } |
| |
| private int readInt(InputStream is) throws IOException { |
| byte[] ibytes = new byte[4]; |
| int ret = readAll(is, ibytes); |
| if (VDBG) Log.d(TAG, "inputStream.read ret: " + ret); |
| ByteBuffer bb = ByteBuffer.wrap(ibytes); |
| bb.order(ByteOrder.nativeOrder()); |
| return bb.getInt(); |
| } |
| } |