/* * Copyright (c) 2002, 2008, Oracle and/or its affiliates. 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. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.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 Void 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; } }