J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2002-2004 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | /* |
| 27 | */ |
| 28 | |
| 29 | package sun.nio.ch; |
| 30 | |
| 31 | import java.io.IOException; |
| 32 | import java.net.InetAddress; |
| 33 | import java.net.InetSocketAddress; |
| 34 | import java.nio.*; |
| 35 | import java.nio.channels.*; |
| 36 | import java.nio.channels.spi.*; |
| 37 | import java.security.AccessController; |
| 38 | import java.security.PrivilegedExceptionAction; |
| 39 | import java.security.PrivilegedActionException; |
| 40 | import java.util.Random; |
| 41 | |
| 42 | |
| 43 | /** |
| 44 | * A simple Pipe implementation based on a socket connection. |
| 45 | */ |
| 46 | |
| 47 | class PipeImpl |
| 48 | extends Pipe |
| 49 | { |
| 50 | |
| 51 | // Source and sink channels |
| 52 | private SourceChannel source; |
| 53 | private SinkChannel sink; |
| 54 | |
| 55 | // Random object for handshake values |
| 56 | private static final Random rnd; |
| 57 | |
| 58 | static { |
| 59 | Util.load(); |
| 60 | byte[] someBytes = new byte[8]; |
| 61 | boolean resultOK = IOUtil.randomBytes(someBytes); |
| 62 | if (resultOK) { |
| 63 | rnd = new Random(ByteBuffer.wrap(someBytes).getLong()); |
| 64 | } else { |
| 65 | rnd = new Random(); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | private class Initializer |
| 70 | implements PrivilegedExceptionAction |
| 71 | { |
| 72 | |
| 73 | private final SelectorProvider sp; |
| 74 | |
| 75 | private Initializer(SelectorProvider sp) { |
| 76 | this.sp = sp; |
| 77 | } |
| 78 | |
| 79 | public Object run() throws IOException { |
| 80 | ServerSocketChannel ssc = null; |
| 81 | SocketChannel sc1 = null; |
| 82 | SocketChannel sc2 = null; |
| 83 | |
| 84 | try { |
| 85 | // loopback address |
| 86 | InetAddress lb = InetAddress.getByName("127.0.0.1"); |
| 87 | assert(lb.isLoopbackAddress()); |
| 88 | |
| 89 | // bind ServerSocketChannel to a port on the loopback address |
| 90 | ssc = ServerSocketChannel.open(); |
| 91 | ssc.socket().bind(new InetSocketAddress(lb, 0)); |
| 92 | |
| 93 | // Establish connection (assumes connections are eagerly |
| 94 | // accepted) |
| 95 | InetSocketAddress sa |
| 96 | = new InetSocketAddress(lb, ssc.socket().getLocalPort()); |
| 97 | sc1 = SocketChannel.open(sa); |
| 98 | |
| 99 | ByteBuffer bb = ByteBuffer.allocate(8); |
| 100 | long secret = rnd.nextLong(); |
| 101 | bb.putLong(secret).flip(); |
| 102 | sc1.write(bb); |
| 103 | |
| 104 | // Get a connection and verify it is legitimate |
| 105 | for (;;) { |
| 106 | sc2 = ssc.accept(); |
| 107 | bb.clear(); |
| 108 | sc2.read(bb); |
| 109 | bb.rewind(); |
| 110 | if (bb.getLong() == secret) |
| 111 | break; |
| 112 | sc2.close(); |
| 113 | } |
| 114 | |
| 115 | // Create source and sink channels |
| 116 | source = new SourceChannelImpl(sp, sc1); |
| 117 | sink = new SinkChannelImpl(sp, sc2); |
| 118 | } catch (IOException e) { |
| 119 | try { |
| 120 | if (sc1 != null) |
| 121 | sc1.close(); |
| 122 | if (sc2 != null) |
| 123 | sc2.close(); |
| 124 | } catch (IOException e2) { } |
| 125 | IOException x = new IOException("Unable to establish" |
| 126 | + " loopback connection"); |
| 127 | x.initCause(e); |
| 128 | throw x; |
| 129 | } finally { |
| 130 | try { |
| 131 | if (ssc != null) |
| 132 | ssc.close(); |
| 133 | } catch (IOException e2) { } |
| 134 | } |
| 135 | return null; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | PipeImpl(final SelectorProvider sp) throws IOException { |
| 140 | try { |
| 141 | AccessController.doPrivileged(new Initializer(sp)); |
| 142 | } catch (PrivilegedActionException x) { |
| 143 | throw (IOException)x.getCause(); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | |
| 148 | public SourceChannel source() { |
| 149 | return source; |
| 150 | } |
| 151 | |
| 152 | public SinkChannel sink() { |
| 153 | return sink; |
| 154 | } |
| 155 | |
| 156 | } |