| /* |
| * Copyright 2002-2004 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| /* |
| */ |
| |
| package sun.nio.ch; |
| |
| import java.io.IOException; |
| import java.net.InetAddress; |
| import java.net.InetSocketAddress; |
| import java.nio.*; |
| import java.nio.channels.*; |
| import java.nio.channels.spi.*; |
| import java.security.AccessController; |
| import java.security.PrivilegedExceptionAction; |
| import java.security.PrivilegedActionException; |
| import java.util.Random; |
| |
| |
| /** |
| * A simple Pipe implementation based on a socket connection. |
| */ |
| |
| class PipeImpl |
| extends Pipe |
| { |
| |
| // Source and sink channels |
| private SourceChannel source; |
| private SinkChannel sink; |
| |
| // Random object for handshake values |
| private static final Random rnd; |
| |
| static { |
| Util.load(); |
| byte[] someBytes = new byte[8]; |
| boolean resultOK = IOUtil.randomBytes(someBytes); |
| if (resultOK) { |
| rnd = new Random(ByteBuffer.wrap(someBytes).getLong()); |
| } else { |
| rnd = new Random(); |
| } |
| } |
| |
| private class Initializer |
| implements PrivilegedExceptionAction |
| { |
| |
| private final SelectorProvider sp; |
| |
| private Initializer(SelectorProvider sp) { |
| this.sp = sp; |
| } |
| |
| public Object run() throws IOException { |
| ServerSocketChannel ssc = null; |
| SocketChannel sc1 = null; |
| SocketChannel sc2 = null; |
| |
| try { |
| // loopback address |
| InetAddress lb = InetAddress.getByName("127.0.0.1"); |
| assert(lb.isLoopbackAddress()); |
| |
| // bind ServerSocketChannel to a port on the loopback address |
| ssc = ServerSocketChannel.open(); |
| ssc.socket().bind(new InetSocketAddress(lb, 0)); |
| |
| // Establish connection (assumes connections are eagerly |
| // accepted) |
| InetSocketAddress sa |
| = new InetSocketAddress(lb, ssc.socket().getLocalPort()); |
| sc1 = SocketChannel.open(sa); |
| |
| ByteBuffer bb = ByteBuffer.allocate(8); |
| long secret = rnd.nextLong(); |
| bb.putLong(secret).flip(); |
| sc1.write(bb); |
| |
| // Get a connection and verify it is legitimate |
| for (;;) { |
| sc2 = ssc.accept(); |
| bb.clear(); |
| sc2.read(bb); |
| bb.rewind(); |
| if (bb.getLong() == secret) |
| break; |
| sc2.close(); |
| } |
| |
| // Create source and sink channels |
| source = new SourceChannelImpl(sp, sc1); |
| sink = new SinkChannelImpl(sp, sc2); |
| } catch (IOException e) { |
| try { |
| if (sc1 != null) |
| sc1.close(); |
| if (sc2 != null) |
| sc2.close(); |
| } catch (IOException e2) { } |
| IOException x = new IOException("Unable to establish" |
| + " loopback connection"); |
| x.initCause(e); |
| throw x; |
| } finally { |
| try { |
| if (ssc != null) |
| ssc.close(); |
| } catch (IOException e2) { } |
| } |
| return null; |
| } |
| } |
| |
| PipeImpl(final SelectorProvider sp) throws IOException { |
| try { |
| AccessController.doPrivileged(new Initializer(sp)); |
| } catch (PrivilegedActionException x) { |
| throw (IOException)x.getCause(); |
| } |
| } |
| |
| |
| public SourceChannel source() { |
| return source; |
| } |
| |
| public SinkChannel sink() { |
| return sink; |
| } |
| |
| } |