1 /*
2 * Copyright (c) 2002, 2005, 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 package java.net;
26 import java.io.IOException;
27
28 /*
29 * Package private implementation of InetAddressImpl for dual
30 * IPv4/IPv6 stack.
31 * <p>
32 * If InetAddress.preferIPv6Address is true then anyLocalAddress(),
33 * loopbackAddress(), and localHost() will return IPv6 addresses,
34 * otherwise IPv4 addresses.
35 *
36 * @since 1.4
37 */
38
39 class Inet6AddressImpl implements InetAddressImpl {
40 public native String getLocalHostName() throws UnknownHostException;
41 public native InetAddress[]
42 lookupAllHostAddr(String hostname) throws UnknownHostException;
43 public native String getHostByAddr(byte[] addr) throws UnknownHostException;
44 private native boolean isReachable0(byte[] addr, int scope, int timeout, byte[] inf, int ttl, int if_scope) throws IOException;
45
46 public boolean isReachable(InetAddress addr, int timeout, NetworkInterface netif, int ttl) throws IOException {
47 byte[] ifaddr = null;
48 int scope = -1;
49 int netif_scope = -1;
50 if (netif != null) {
51 /*
52 * Let's make sure we bind to an address of the proper family.
53 * Which means same family as addr because at this point it could
54 * be either an IPv6 address or an IPv4 address (case of a dual
55 * stack system).
56 */
57 java.util.Enumeration it = netif.getInetAddresses();
58 InetAddress inetaddr = null;
59 while (it.hasMoreElements()) {
60 inetaddr = (InetAddress) it.nextElement();
61 if (inetaddr.getClass().isInstance(addr)) {
62 ifaddr = inetaddr.getAddress();
63 if (inetaddr instanceof Inet6Address) {
64 netif_scope = ((Inet6Address) inetaddr).getScopeId();
65 }
66 break;
67 }
68 }
69 if (ifaddr == null) {
70 // Interface doesn't support the address family of
71 // the destination
72 return false;
73 }
74 }
75 if (addr instanceof Inet6Address)
76 scope = ((Inet6Address) addr).getScopeId();
77 return isReachable0(addr.getAddress(), scope, timeout, ifaddr, ttl, netif_scope);
78 }
79
80 public synchronized InetAddress anyLocalAddress() {
81 if (anyLocalAddress == null) {
82 if (InetAddress.preferIPv6Address) {
83 anyLocalAddress = new Inet6Address();
84 anyLocalAddress.holder().hostName = "::";
85 } else {
86 anyLocalAddress = (new Inet4AddressImpl()).anyLocalAddress();
87 }
88 }
89 return anyLocalAddress;
90 }
91
92 public synchronized InetAddress loopbackAddress() {
93 if (loopbackAddress == null) {
94 if (InetAddress.preferIPv6Address) {
95 byte[] loopback =
96 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
97 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
98 loopbackAddress = new Inet6Address("localhost", loopback);
99 } else {
100 loopbackAddress = (new Inet4AddressImpl()).loopbackAddress();
101 }
102 }
103 return loopbackAddress;
104 }
105
106 private InetAddress anyLocalAddress;
107 private InetAddress loopbackAddress;
108 }