/*
 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */
package java.net;
import java.io.IOException;

/*
 * Package private implementation of InetAddressImpl for dual
 * IPv4/IPv6 stack.
 * <p>
 * If InetAddress.preferIPv6Address is true then anyLocalAddress(),
 * loopbackAddress(), and localHost() will return IPv6 addresses,
 * otherwise IPv4 addresses.
 *
 * @since 1.4
 */

class Inet6AddressImpl implements InetAddressImpl {
 public native String getLocalHostName() throws UnknownHostException;
 public native InetAddress[]
 lookupAllHostAddr(String hostname) throws UnknownHostException;
 public native String getHostByAddr(byte[] addr) throws UnknownHostException;
 private native boolean isReachable0(byte[] addr, int scope, int timeout, byte[] inf, int ttl, int if_scope) throws IOException;

 public boolean isReachable(InetAddress addr, int timeout, NetworkInterface netif, int ttl) throws IOException {
 byte[] ifaddr = null;
 int scope = -1;
 int netif_scope = -1;
 if (netif != null) {
 /*
 * Let's make sure we bind to an address of the proper family.
 * Which means same family as addr because at this point it could
 * be either an IPv6 address or an IPv4 address (case of a dual
 * stack system).
 */
 java.util.Enumeration<InetAddress> it = netif.getInetAddresses();
 InetAddress inetaddr = null;
 while (it.hasMoreElements()) {
 inetaddr = it.nextElement();
 if (inetaddr.getClass().isInstance(addr)) {
 ifaddr = inetaddr.getAddress();
 if (inetaddr instanceof Inet6Address) {
 netif_scope = ((Inet6Address) inetaddr).getScopeId();
 }
 break;
 }
 }
 if (ifaddr == null) {
 // Interface doesn't support the address family of
 // the destination
 return false;
 }
 }
 if (addr instanceof Inet6Address)
 scope = ((Inet6Address) addr).getScopeId();
 return isReachable0(addr.getAddress(), scope, timeout, ifaddr, ttl, netif_scope);
 }

 public synchronized InetAddress anyLocalAddress() {
 if (anyLocalAddress == null) {
 if (InetAddress.preferIPv6Address) {
 anyLocalAddress = new Inet6Address();
 anyLocalAddress.holder().hostName = "::";
 } else {
 anyLocalAddress = (new Inet4AddressImpl()).anyLocalAddress();
 }
 }
 return anyLocalAddress;
 }

 public synchronized InetAddress loopbackAddress() {
 if (loopbackAddress == null) {
 if (InetAddress.preferIPv6Address) {
 byte[] loopback =
 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
 loopbackAddress = new Inet6Address("localhost", loopback);
 } else {
 loopbackAddress = (new Inet4AddressImpl()).loopbackAddress();
 }
 }
 return loopbackAddress;
 }

 private InetAddress anyLocalAddress;
 private InetAddress loopbackAddress;
}