1 /* VMInetAddress.java -- Class to model an Internet address
2 Copyright (C) 2005 Free Software Foundation, Inc.
3
4 This file is part of GNU Classpath.
5
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301 USA.
20
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
37
38
39 package java.net;
40
41 import gnu.classpath.Configuration;
42
43 import java.io.Serializable;
44
45 class VMInetAddress implements Serializable
46 {
47 static
48 {
49 if (Configuration.INIT_LOAD_LIBRARY)
50 System.loadLibrary("javanet");
51 }
52
53 /**
54 * This method looks up the hostname of the local machine
55 * we are on. If the actual hostname cannot be determined, then the
56 * value "localhost" will be used. This native method wrappers the
57 * "gethostname" function.
58 *
59 * @return The local hostname.
60 */
61 public static native String getLocalHostname();
62
63 /**
64 * Returns the value of the special address INADDR_ANY
65 */
66 public static native byte[] lookupInaddrAny() throws UnknownHostException;
67
68 /**
69 * This method returns the hostname for a given IP address. It will
70 * throw an UnknownHostException if the hostname cannot be determined.
71 *
72 * @param ip The IP address as a byte array
73 *
74 * @return The hostname
75 *
76 * @exception UnknownHostException If the reverse lookup fails
77 */
78 public static native String getHostByAddr(byte[] ip)
79 throws UnknownHostException;
80
81 /**
82 * Returns a list of all IP addresses for a given hostname. Will throw
83 * an UnknownHostException if the hostname cannot be resolved.
84 */
85 public static native byte[][] getHostByName(String hostname)
86 throws UnknownHostException;
87 }
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