| /* VMInetAddress.java -- Class to model an Internet address |
| Copyright (C) 2005 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package java.net; |
| |
| import gnu.classpath.Configuration; |
| |
| import java.io.Serializable; |
| |
| class VMInetAddress implements Serializable |
| { |
| static |
| { |
| if (Configuration.INIT_LOAD_LIBRARY) |
| System.loadLibrary("javanet"); |
| } |
| |
| /** |
| * This method looks up the hostname of the local machine |
| * we are on. If the actual hostname cannot be determined, then the |
| * value "localhost" will be used. This native method wrappers the |
| * "gethostname" function. |
| * |
| * @return The local hostname. |
| */ |
| public static String getLocalHostname() |
| { |
| return InetAddress.getLocalHostname(); |
| } |
| |
| /** |
| * Returns the value of the special address INADDR_ANY |
| */ |
| public static byte[] lookupInaddrAny() throws UnknownHostException |
| { |
| return new byte[] {0, 0, 0, 0}; |
| } |
| |
| /** |
| * This method returns the hostname for a given IP address. It will |
| * throw an UnknownHostException if the hostname cannot be determined. |
| * |
| * @param ip The IP address as a byte array |
| * |
| * @return The hostname |
| * |
| * @exception UnknownHostException If the reverse lookup fails |
| */ |
| public static String getHostByAddr(byte[] ip) throws UnknownHostException |
| { |
| InetAddress addr = InetAddress.getByAddress(ip); |
| InetAddress.lookup(null, addr, false); |
| return addr.getHostName(); |
| } |
| |
| /** |
| * Returns a list of all IP addresses for a given hostname. Will throw |
| * an UnknownHostException if the hostname cannot be resolved. |
| */ |
| public static byte[][] getHostByName(String hostname) |
| throws UnknownHostException |
| { |
| InetAddress[] iaddrs = InetAddress.lookup(hostname, null, true); |
| byte[][] addrs = new byte[iaddrs.length][]; |
| for (int i = 0; i < iaddrs.length; i++) |
| addrs[i] = iaddrs[i].getAddress(); |
| return addrs; |
| } |
| |
| /** |
| * Return the IP address represented by a literal address. |
| * Will return null if the literal address is not valid. |
| * |
| * @param address the name of the host |
| * |
| * @return The IP address as a byte array |
| */ |
| public static byte[] aton(String address) |
| { |
| return InetAddress.aton(address); |
| } |
| } |