1 /* VMInetAddress.java -- Class to model an Internet address 2 Copyright (C) 2005, 2010 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 final class VMInetAddress 44 { 45 46 static 47 { 48 if (Configuration.INIT_LOAD_LIBRARY) 49 System.loadLibrary("javanet"); 50 } 51 VMInetAddress()52 private VMInetAddress() {} // Prohibits instantiation. 53 54 /** 55 * This method looks up the hostname of the local machine 56 * we are on. If the actual hostname cannot be determined, then the 57 * value "localhost" will be used. This native method wrappers the 58 * "gethostname" function. 59 * 60 * @return The local hostname. 61 */ getLocalHostname()62 static native String getLocalHostname(); 63 64 /** 65 * Returns the value of the special address INADDR_ANY 66 */ lookupInaddrAny()67 static native byte[] lookupInaddrAny() throws UnknownHostException; 68 69 /** 70 * This method returns the hostname for a given IP address. It will 71 * throw an UnknownHostException if the hostname cannot be determined. 72 * 73 * @param ip The IP address as a byte array 74 * 75 * @return The hostname 76 * 77 * @exception UnknownHostException If the reverse lookup fails 78 */ getHostByAddr(byte[] ip)79 static native String getHostByAddr(byte[] ip) 80 throws UnknownHostException; 81 82 /** 83 * Returns a list of all IP addresses for a given hostname. Will throw 84 * an UnknownHostException if the hostname cannot be resolved. 85 */ getHostByName(String hostname)86 static native byte[][] getHostByName(String hostname) 87 throws UnknownHostException; 88 89 /** 90 * Return the IP address represented by a literal address. 91 * Will return null if the literal address is not valid. 92 * 93 * @param address the name of the host 94 * 95 * @return The IP address as a byte array 96 */ aton(String address)97 static native byte[] aton(String address); 98 } 99