1/* 2 * Copyright (c) 2002, 2016, 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 */ 25package java.net; 26 27import java.io.IOException; 28import static java.net.InetAddress.PREFER_IPV6_VALUE; 29import static java.net.InetAddress.PREFER_SYSTEM_VALUE; 30 31/* 32 * Package private implementation of InetAddressImpl for dual 33 * IPv4/IPv6 stack. 34 * <p> 35 * If InetAddress.preferIPv6Address is true then anyLocalAddress(), 36 * loopbackAddress(), and localHost() will return IPv6 addresses, 37 * otherwise IPv4 addresses. 38 * 39 * @since 1.4 40 */ 41class Inet6AddressImpl implements InetAddressImpl { 42 43 public native String getLocalHostName() throws UnknownHostException; 44 45 public native InetAddress[] lookupAllHostAddr(String hostname) 46 throws UnknownHostException; 47 48 public native String getHostByAddr(byte[] addr) throws UnknownHostException; 49 50 private native boolean isReachable0(byte[] addr, int scope, int timeout, 51 byte[] inf, int ttl, int if_scope) 52 throws IOException; 53 54 public boolean isReachable(InetAddress addr, int timeout, 55 NetworkInterface netif, int ttl) 56 throws IOException 57 { 58 byte[] ifaddr = null; 59 int scope = -1; 60 int netif_scope = -1; 61 if (netif != null) { 62 /* 63 * Let's make sure we bind to an address of the proper family. 64 * Which means same family as addr because at this point it could 65 * be either an IPv6 address or an IPv4 address (case of a dual 66 * stack system). 67 */ 68 java.util.Enumeration<InetAddress> it = netif.getInetAddresses(); 69 InetAddress inetaddr = null; 70 while (it.hasMoreElements()) { 71 inetaddr = it.nextElement(); 72 if (inetaddr.getClass().isInstance(addr)) { 73 ifaddr = inetaddr.getAddress(); 74 if (inetaddr instanceof Inet6Address) { 75 netif_scope = ((Inet6Address) inetaddr).getScopeId(); 76 } 77 break; 78 } 79 } 80 if (ifaddr == null) { 81 // Interface doesn't support the address family of 82 // the destination 83 return false; 84 } 85 } 86 if (addr instanceof Inet6Address) 87 scope = ((Inet6Address) addr).getScopeId(); 88 return isReachable0(addr.getAddress(), scope, timeout, ifaddr, ttl, netif_scope); 89 } 90 91 public synchronized InetAddress anyLocalAddress() { 92 if (anyLocalAddress == null) { 93 if (InetAddress.preferIPv6Address == PREFER_IPV6_VALUE || 94 InetAddress.preferIPv6Address == PREFER_SYSTEM_VALUE) { 95 anyLocalAddress = new Inet6Address(); 96 anyLocalAddress.holder().hostName = "::"; 97 } else { 98 anyLocalAddress = (new Inet4AddressImpl()).anyLocalAddress(); 99 } 100 } 101 return anyLocalAddress; 102 } 103 104 public synchronized InetAddress loopbackAddress() { 105 if (loopbackAddress == null) { 106 if (InetAddress.preferIPv6Address == PREFER_IPV6_VALUE || 107 InetAddress.preferIPv6Address == PREFER_SYSTEM_VALUE) { 108 byte[] loopback = 109 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 110 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; 111 loopbackAddress = new Inet6Address("localhost", loopback); 112 } else { 113 loopbackAddress = (new Inet4AddressImpl()).loopbackAddress(); 114 } 115 } 116 return loopbackAddress; 117 } 118 119 private InetAddress anyLocalAddress; 120 private InetAddress loopbackAddress; 121} 122