The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 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.net; |
| 18 | |
Jeff Sharkey | 065b299 | 2012-08-05 14:16:48 -0700 | [diff] [blame] | 19 | import java.io.Closeable; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 20 | import java.io.FileDescriptor; |
| 21 | import java.io.IOException; |
| 22 | import java.io.InputStream; |
| 23 | import java.io.OutputStream; |
| 24 | import java.net.SocketOptions; |
| 25 | |
| 26 | /** |
| 27 | * Creates a (non-server) socket in the UNIX-domain namespace. The interface |
| 28 | * here is not entirely unlike that of java.net.Socket |
| 29 | */ |
Jeff Sharkey | 065b299 | 2012-08-05 14:16:48 -0700 | [diff] [blame] | 30 | public class LocalSocket implements Closeable { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 31 | |
| 32 | private LocalSocketImpl impl; |
| 33 | private volatile boolean implCreated; |
| 34 | private LocalSocketAddress localAddress; |
| 35 | private boolean isBound; |
| 36 | private boolean isConnected; |
| 37 | |
| 38 | /** |
| 39 | * Creates a AF_LOCAL/UNIX domain stream socket. |
| 40 | */ |
| 41 | public LocalSocket() { |
| 42 | this(new LocalSocketImpl()); |
| 43 | isBound = false; |
| 44 | isConnected = false; |
| 45 | } |
zzy | 3b147b7 | 2012-04-03 19:48:32 -0700 | [diff] [blame] | 46 | /** |
| 47 | * Creates a AF_LOCAL/UNIX domain stream socket with FileDescriptor. |
| 48 | * @hide |
| 49 | */ |
| 50 | public LocalSocket(FileDescriptor fd) throws IOException { |
| 51 | this(new LocalSocketImpl(fd)); |
| 52 | isBound = true; |
| 53 | isConnected = true; |
| 54 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 55 | |
| 56 | /** |
| 57 | * for use with AndroidServerSocket |
| 58 | * @param impl a SocketImpl |
| 59 | */ |
| 60 | /*package*/ LocalSocket(LocalSocketImpl impl) { |
| 61 | this.impl = impl; |
| 62 | this.isConnected = false; |
| 63 | this.isBound = false; |
| 64 | } |
| 65 | |
| 66 | /** {@inheritDoc} */ |
| 67 | @Override |
| 68 | public String toString() { |
| 69 | return super.toString() + " impl:" + impl; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * It's difficult to discern from the spec when impl.create() should be |
| 74 | * called, but it seems like a reasonable rule is "as soon as possible, |
| 75 | * but not in a context where IOException cannot be thrown" |
| 76 | * |
| 77 | * @throws IOException from SocketImpl.create() |
| 78 | */ |
| 79 | private void implCreateIfNeeded() throws IOException { |
| 80 | if (!implCreated) { |
| 81 | synchronized (this) { |
| 82 | if (!implCreated) { |
Jesse Wilson | c59a662 | 2010-09-21 10:26:57 -0700 | [diff] [blame] | 83 | try { |
| 84 | impl.create(true); |
| 85 | } finally { |
| 86 | implCreated = true; |
| 87 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 88 | } |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Connects this socket to an endpoint. May only be called on an instance |
| 95 | * that has not yet been connected. |
| 96 | * |
| 97 | * @param endpoint endpoint address |
| 98 | * @throws IOException if socket is in invalid state or the address does |
| 99 | * not exist. |
| 100 | */ |
| 101 | public void connect(LocalSocketAddress endpoint) throws IOException { |
| 102 | synchronized (this) { |
| 103 | if (isConnected) { |
| 104 | throw new IOException("already connected"); |
| 105 | } |
| 106 | |
| 107 | implCreateIfNeeded(); |
| 108 | impl.connect(endpoint, 0); |
| 109 | isConnected = true; |
| 110 | isBound = true; |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * Binds this socket to an endpoint name. May only be called on an instance |
| 116 | * that has not yet been bound. |
| 117 | * |
| 118 | * @param bindpoint endpoint address |
| 119 | * @throws IOException |
| 120 | */ |
| 121 | public void bind(LocalSocketAddress bindpoint) throws IOException { |
| 122 | implCreateIfNeeded(); |
| 123 | |
| 124 | synchronized (this) { |
| 125 | if (isBound) { |
| 126 | throw new IOException("already bound"); |
| 127 | } |
| 128 | |
| 129 | localAddress = bindpoint; |
| 130 | impl.bind(localAddress); |
| 131 | isBound = true; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Retrieves the name that this socket is bound to, if any. |
| 137 | * |
| 138 | * @return Local address or null if anonymous |
| 139 | */ |
| 140 | public LocalSocketAddress getLocalSocketAddress() { |
| 141 | return localAddress; |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Retrieves the input stream for this instance. |
| 146 | * |
| 147 | * @return input stream |
| 148 | * @throws IOException if socket has been closed or cannot be created. |
| 149 | */ |
| 150 | public InputStream getInputStream() throws IOException { |
| 151 | implCreateIfNeeded(); |
| 152 | return impl.getInputStream(); |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * Retrieves the output stream for this instance. |
| 157 | * |
| 158 | * @return output stream |
| 159 | * @throws IOException if socket has been closed or cannot be created. |
| 160 | */ |
| 161 | public OutputStream getOutputStream() throws IOException { |
| 162 | implCreateIfNeeded(); |
| 163 | return impl.getOutputStream(); |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * Closes the socket. |
| 168 | * |
| 169 | * @throws IOException |
| 170 | */ |
Jeff Sharkey | 065b299 | 2012-08-05 14:16:48 -0700 | [diff] [blame] | 171 | @Override |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 172 | public void close() throws IOException { |
| 173 | implCreateIfNeeded(); |
| 174 | impl.close(); |
| 175 | } |
| 176 | |
| 177 | /** |
| 178 | * Shuts down the input side of the socket. |
| 179 | * |
| 180 | * @throws IOException |
| 181 | */ |
| 182 | public void shutdownInput() throws IOException { |
| 183 | implCreateIfNeeded(); |
| 184 | impl.shutdownInput(); |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * Shuts down the output side of the socket. |
| 189 | * |
| 190 | * @throws IOException |
| 191 | */ |
| 192 | public void shutdownOutput() throws IOException { |
| 193 | implCreateIfNeeded(); |
| 194 | impl.shutdownOutput(); |
| 195 | } |
| 196 | |
| 197 | public void setReceiveBufferSize(int size) throws IOException { |
| 198 | impl.setOption(SocketOptions.SO_RCVBUF, Integer.valueOf(size)); |
| 199 | } |
| 200 | |
| 201 | public int getReceiveBufferSize() throws IOException { |
| 202 | return ((Integer) impl.getOption(SocketOptions.SO_RCVBUF)).intValue(); |
| 203 | } |
| 204 | |
| 205 | public void setSoTimeout(int n) throws IOException { |
| 206 | impl.setOption(SocketOptions.SO_TIMEOUT, Integer.valueOf(n)); |
| 207 | } |
| 208 | |
| 209 | public int getSoTimeout() throws IOException { |
| 210 | return ((Integer) impl.getOption(SocketOptions.SO_TIMEOUT)).intValue(); |
| 211 | } |
| 212 | |
| 213 | public void setSendBufferSize(int n) throws IOException { |
| 214 | impl.setOption(SocketOptions.SO_SNDBUF, Integer.valueOf(n)); |
| 215 | } |
| 216 | |
| 217 | public int getSendBufferSize() throws IOException { |
| 218 | return ((Integer) impl.getOption(SocketOptions.SO_SNDBUF)).intValue(); |
| 219 | } |
| 220 | |
| 221 | //???SEC |
| 222 | public LocalSocketAddress getRemoteSocketAddress() { |
| 223 | throw new UnsupportedOperationException(); |
| 224 | } |
| 225 | |
| 226 | //???SEC |
| 227 | public synchronized boolean isConnected() { |
| 228 | return isConnected; |
| 229 | } |
| 230 | |
| 231 | //???SEC |
| 232 | public boolean isClosed() { |
| 233 | throw new UnsupportedOperationException(); |
| 234 | } |
| 235 | |
| 236 | //???SEC |
| 237 | public synchronized boolean isBound() { |
| 238 | return isBound; |
| 239 | } |
| 240 | |
| 241 | //???SEC |
| 242 | public boolean isOutputShutdown() { |
| 243 | throw new UnsupportedOperationException(); |
| 244 | } |
| 245 | |
| 246 | //???SEC |
| 247 | public boolean isInputShutdown() { |
| 248 | throw new UnsupportedOperationException(); |
| 249 | } |
| 250 | |
| 251 | //???SEC |
| 252 | public void connect(LocalSocketAddress endpoint, int timeout) |
| 253 | throws IOException { |
| 254 | throw new UnsupportedOperationException(); |
| 255 | } |
| 256 | |
| 257 | /** |
| 258 | * Enqueues a set of file descriptors to send to the peer. The queue |
| 259 | * is one deep. The file descriptors will be sent with the next write |
| 260 | * of normal data, and will be delivered in a single ancillary message. |
| 261 | * See "man 7 unix" SCM_RIGHTS on a desktop Linux machine. |
| 262 | * |
| 263 | * @param fds non-null; file descriptors to send. |
| 264 | */ |
| 265 | public void setFileDescriptorsForSend(FileDescriptor[] fds) { |
| 266 | impl.setFileDescriptorsForSend(fds); |
| 267 | } |
| 268 | |
| 269 | /** |
| 270 | * Retrieves a set of file descriptors that a peer has sent through |
| 271 | * an ancillary message. This method retrieves the most recent set sent, |
| 272 | * and then returns null until a new set arrives. |
| 273 | * File descriptors may only be passed along with regular data, so this |
| 274 | * method can only return a non-null after a read operation. |
| 275 | * |
| 276 | * @return null or file descriptor array |
| 277 | * @throws IOException |
| 278 | */ |
| 279 | public FileDescriptor[] getAncillaryFileDescriptors() throws IOException { |
| 280 | return impl.getAncillaryFileDescriptors(); |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * Retrieves the credentials of this socket's peer. Only valid on |
| 285 | * connected sockets. |
| 286 | * |
| 287 | * @return non-null; peer credentials |
| 288 | * @throws IOException |
| 289 | */ |
| 290 | public Credentials getPeerCredentials() throws IOException { |
| 291 | return impl.getPeerCredentials(); |
| 292 | } |
| 293 | |
| 294 | /** |
| 295 | * Returns file descriptor or null if not yet open/already closed |
| 296 | * |
| 297 | * @return fd or null |
| 298 | */ |
| 299 | public FileDescriptor getFileDescriptor() { |
| 300 | return impl.getFileDescriptor(); |
| 301 | } |
| 302 | } |