NetworkConfiguration.java revision 4515:6d2f09eed4e3 
1/*
2 * Copyright (c) 2007, 2008, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24import java.net.*;
25import java.util.*;
26import java.io.IOException;
27
28/**
29 * Helper class for multicasting tests.
30 */
31
32class NetworkConfiguration {
33
34    private Map<NetworkInterface,List<InetAddress>> ip4Interfaces;
35    private Map<NetworkInterface,List<InetAddress>> ip6Interfaces;
36
37    private NetworkConfiguration(Map<NetworkInterface,List<InetAddress>> ip4Interfaces,
38                                 Map<NetworkInterface,List<InetAddress>> ip6Interfaces)
39    {
40        this.ip4Interfaces = ip4Interfaces;
41        this.ip6Interfaces = ip6Interfaces;
42    }
43
44    Iterable<NetworkInterface> ip4Interfaces() {
45        return ip4Interfaces.keySet();
46    }
47
48    Iterable<NetworkInterface> ip6Interfaces() {
49        return ip6Interfaces.keySet();
50    }
51
52    Iterable<InetAddress> ip4Addresses(NetworkInterface nif) {
53        return ip4Interfaces.get(nif);
54    }
55
56    Iterable<InetAddress> ip6Addresses(NetworkInterface nif) {
57        return ip6Interfaces.get(nif);
58    }
59
60    // IPv6 not supported for Windows XP/Server 2003
61    static boolean isIPv6Supported() {
62        if (System.getProperty("os.name").startsWith("Windows")) {
63            String ver = System.getProperty("os.version");
64            int major = Integer.parseInt(ver.split("\\.")[0]);
65            return (major >= 6);
66        }
67        return true;
68    }
69
70    static NetworkConfiguration probe() throws IOException {
71        Map<NetworkInterface,List<InetAddress>> ip4Interfaces =
72            new HashMap<NetworkInterface,List<InetAddress>>();
73        Map<NetworkInterface,List<InetAddress>> ip6Interfaces =
74            new HashMap<NetworkInterface,List<InetAddress>>();
75        boolean isIPv6Supported = isIPv6Supported();
76
77        // find the interfaces that support IPv4 and IPv6
78        List<NetworkInterface> nifs = Collections
79            .list(NetworkInterface.getNetworkInterfaces());
80        for (NetworkInterface nif: nifs) {
81            // ignore intertaces that are down or don't support multicast
82            if (!nif.isUp() || !nif.supportsMulticast() || nif.isLoopback())
83                continue;
84
85            List<InetAddress> addrs = Collections.list(nif.getInetAddresses());
86            for (InetAddress addr: addrs) {
87                if (!addr.isAnyLocalAddress()) {
88                    if (addr instanceof Inet4Address) {
89                        List<InetAddress> list = ip4Interfaces.get(nif);
90                        if (list == null) {
91                            list = new LinkedList<InetAddress>();
92                        }
93                        list.add(addr);
94                        ip4Interfaces.put(nif, list);
95                    } else if (isIPv6Supported && (addr instanceof Inet6Address)) {
96                        List<InetAddress> list = ip6Interfaces.get(nif);
97                        if (list == null) {
98                            list = new LinkedList<InetAddress>();
99                        }
100                        list.add(addr);
101                        ip6Interfaces.put(nif, list);
102                    }
103                }
104            }
105        }
106        return new NetworkConfiguration(ip4Interfaces, ip6Interfaces);
107    }
108}
109