J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2002-2005 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | package java.net; |
| 26 | import java.io.IOException; |
| 27 | |
| 28 | /* |
| 29 | * Package private implementation of InetAddressImpl for IPv4. |
| 30 | * |
| 31 | * @since 1.4 |
| 32 | */ |
| 33 | class Inet4AddressImpl implements InetAddressImpl { |
| 34 | public native String getLocalHostName() throws UnknownHostException; |
| 35 | public native InetAddress[] |
| 36 | lookupAllHostAddr(String hostname) throws UnknownHostException; |
| 37 | public native String getHostByAddr(byte[] addr) throws UnknownHostException; |
| 38 | private native boolean isReachable0(byte[] addr, int timeout, byte[] ifaddr, int ttl) throws IOException; |
| 39 | |
| 40 | public synchronized InetAddress anyLocalAddress() { |
| 41 | if (anyLocalAddress == null) { |
| 42 | anyLocalAddress = new Inet4Address(); // {0x00,0x00,0x00,0x00} |
| 43 | anyLocalAddress.hostName = "0.0.0.0"; |
| 44 | } |
| 45 | return anyLocalAddress; |
| 46 | } |
| 47 | |
| 48 | public synchronized InetAddress loopbackAddress() { |
| 49 | if (loopbackAddress == null) { |
| 50 | byte[] loopback = {0x7f,0x00,0x00,0x01}; |
| 51 | loopbackAddress = new Inet4Address("localhost", loopback); |
| 52 | } |
| 53 | return loopbackAddress; |
| 54 | } |
| 55 | |
| 56 | public boolean isReachable(InetAddress addr, int timeout, NetworkInterface netif, int ttl) throws IOException { |
| 57 | byte[] ifaddr = null; |
| 58 | if (netif != null) { |
| 59 | /* |
| 60 | * Let's make sure we use an address of the proper family |
| 61 | */ |
| 62 | java.util.Enumeration it = netif.getInetAddresses(); |
| 63 | InetAddress inetaddr = null; |
| 64 | while (!(inetaddr instanceof Inet4Address) && |
| 65 | it.hasMoreElements()) |
| 66 | inetaddr = (InetAddress) it.nextElement(); |
| 67 | if (inetaddr instanceof Inet4Address) |
| 68 | ifaddr = inetaddr.getAddress(); |
| 69 | } |
| 70 | return isReachable0(addr.getAddress(), timeout, ifaddr, ttl); |
| 71 | } |
| 72 | private InetAddress anyLocalAddress; |
| 73 | private InetAddress loopbackAddress; |
| 74 | } |