/*
* Copyright (c) 2002, 2018, 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.security.SecureRandom;
import java.util.Random;
/**
* A simple Pipe implementation based on a socket connection.
*/
class PipeImpl
extends Pipe
{
// Number of bytes in the secret handshake.
private static final int NUM_SECRET_BYTES = 16;
// Random object for handshake values
private static final Random RANDOM_NUMBER_GENERATOR = new SecureRandom();
// Source and sink channels
private SourceChannel source;
private SinkChannel sink;
private class Initializer
implements PrivilegedExceptionAction<Void>
{
private final SelectorProvider sp;
private IOException ioe = null;
private Initializer(SelectorProvider sp) {
this.sp = sp;
}
@Override
public Void run() throws IOException {
LoopbackConnector connector = new LoopbackConnector();
connector.run();
if (ioe instanceof ClosedByInterruptException) {
ioe = null;
Thread connThread = new Thread(connector) {
@Override
public void interrupt() {}
};
connThread.start();
for (;;) {
try {
connThread.join();
break;
} catch (InterruptedException ex) {}
}
Thread.currentThread().interrupt();
}
if (ioe != null)
throw new IOException("Unable to establish loopback connection", ioe);
return null;
}
private class LoopbackConnector implements Runnable {
@Override
public void run() {
ServerSocketChannel ssc = null;
SocketChannel sc1 = null;
SocketChannel sc2 = null;
try {
// Create secret with a backing array.
ByteBuffer secret = ByteBuffer.allocate(NUM_SECRET_BYTES);
ByteBuffer bb = ByteBuffer.allocate(NUM_SECRET_BYTES);
// Loopback address
InetAddress lb = InetAddress.getLoopbackAddress();
assert(lb.isLoopbackAddress());
InetSocketAddress sa = null;
for(;;) {
// Bind ServerSocketChannel to a port on the loopback
// address
if (ssc == null || !ssc.isOpen()) {
ssc = ServerSocketChannel.open();
ssc.socket().bind(new InetSocketAddress(lb, 0));
sa = new InetSocketAddress(lb, ssc.socket().getLocalPort());
}
// Establish connection (assume connections are eagerly
// accepted)
sc1 = SocketChannel.open(sa);
RANDOM_NUMBER_GENERATOR.nextBytes(secret.array());
do {
sc1.write(secret);
} while (secret.hasRemaining());
secret.rewind();
// Get a connection and verify it is legitimate
sc2 = ssc.accept();
do {
sc2.read(bb);
} while (bb.hasRemaining());
bb.rewind();
if (bb.equals(secret))
break;
sc2.close();
sc1.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) {}
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