1/*
2 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. 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.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.net;
27
28import java.net.InetAddress;
29import java.io.FileDescriptor;
30import java.io.IOException;
31
32/**
33 * Defines static methods to be invoked prior to binding or connecting TCP sockets.
34 */
35
36public final class NetHooks {
37
38    /**
39     * A provider with hooks to allow sockets be converted prior to binding or
40     * connecting a TCP socket.
41     *
42     * <p> Concrete implementations of this class should define a zero-argument
43     * constructor and implement the abstract methods specified below.
44     */
45    public abstract static class Provider {
46        /**
47         * Initializes a new instance of this class.
48         */
49        protected Provider() {}
50
51        /**
52         * Invoked prior to binding a TCP socket.
53         */
54        public abstract void implBeforeTcpBind(FileDescriptor fdObj,
55                                               InetAddress address,
56                                               int port)
57            throws IOException;
58
59        /**
60         * Invoked prior to connecting an unbound TCP socket.
61         */
62        public abstract void implBeforeTcpConnect(FileDescriptor fdObj,
63                                                 InetAddress address,
64                                                 int port)
65            throws IOException;
66    }
67
68    /**
69     * For now, we load the SDP provider on Solaris. In the future this may
70     * be changed to use the ServiceLoader facility to allow the deployment of
71     * other providers.
72     */
73    private static final Provider provider = new sun.net.sdp.SdpProvider();
74
75    /**
76     * Invoke prior to binding a TCP socket.
77     */
78    public static void beforeTcpBind(FileDescriptor fdObj,
79                                     InetAddress address,
80                                     int port)
81        throws IOException
82    {
83        provider.implBeforeTcpBind(fdObj, address, port);
84    }
85
86    /**
87     * Invoke prior to connecting an unbound TCP socket.
88     */
89    public static void beforeTcpConnect(FileDescriptor fdObj,
90                                        InetAddress address,
91                                        int port)
92        throws IOException
93    {
94        provider.implBeforeTcpConnect(fdObj, address, port);
95    }
96}
97