--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/net/Inet6AddressImpl.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,108 @@
+/*
+ * Copyright 2002-2005 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+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 it = netif.getInetAddresses();
+            InetAddress inetaddr = null;
+            while (it.hasMoreElements()) {
+                inetaddr = (InetAddress) 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.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;
+}