/*
 
* Copyright (c) 2000, 2013, Oracle and/or its affiliates. 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.
  
Oracle designates this
 
* particular file as subject to the "Classpath" exception as provided
 
* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 
* or visit www.oracle.com if you need additional information or have any
 
* questions.
 
*/

package java.net;

import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamField;
import java.util.Enumeration;
import java.util.Arrays;

/**
 
* This class represents an Internet Protocol version 6 (IPv6) address.
 
* Defined by <a href=" http://www.ietf.org/rfc/rfc2373.txt">
 
* <i>RFC&nbsp;2373: IP Version 6 Addressing Architecture</i></a>.
 
*
 
* <h3> <A NAME="format">Textual representation of IP addresses</a> </h3>
 
*
 
* Textual representation of IPv6 address used as input to methods
 
* takes one of the following forms:
 
*
 
* <ol>
 
*
   
<li><p> <A NAME="lform">The preferred form</a> is x:x:x:x:x:x:x:x,
 
*
   
where the 'x's are
 
*
   
the hexadecimal values of the eight 16-bit pieces of the
 
*
   
address. This is the full form.
  
For example,
 
*
 
*
   
<blockquote><table cellpadding=0 cellspacing=0 summary="layout">
 
*
   
<tr><td>{@code 1080:0:0:0:8:800:200C:417A}<td></tr>
 
*
   
</table></blockquote>
 
*
 
*
   
<p> Note that it is not necessary to write the leading zeros in
 
*
   
an individual field. However, there must be at least one numeral
 
*
   
in every field, except as described below.</li>
 
*
 
*
   
<li><p> Due to some methods of allocating certain styles of IPv6
 
*
   
addresses, it will be common for addresses to contain long
 
*
   
strings of zero bits. In order to make writing addresses
 
*
   
containing zero bits easier, a special syntax is available to
 
*
   
compress the zeros. The use of "::" indicates multiple groups
 
*
   
of 16-bits of zeros. The "::" can only appear once in an address.
 
*
   
The "::" can also be used to compress the leading and/or trailing
 
*
   
zeros in an address. For example,
 
*
 
*
   
<blockquote><table cellpadding=0 cellspacing=0 summary="layout">
 
*
   
<tr><td>{@code 1080::8:800:200C:417A}<td></tr>
 
*
   
</table></blockquote>
 
*
 
*
   
<li><p> An alternative form that is sometimes more convenient
 
*
   
when dealing with a mixed environment of IPv4 and IPv6 nodes is
 
*
   
x:x:x:x:x:x:d.d.d.d, where the 'x's are the hexadecimal values
 
*
   
of the six high-order 16-bit pieces of the address, and the 'd's
 
*
   
are the decimal values of the four low-order 8-bit pieces of the
 
*
   
standard IPv4 representation address, for example,
 
*
 
*
   
<blockquote><table cellpadding=0 cellspacing=0 summary="layout">
 
*
   
<tr><td>{@code ::FFFF:129.144.52.38}<td></tr>
 
*
   
<tr><td>{@code ::129.144.52.38}<td></tr>
 
*
   
</table></blockquote>
 
*
 
*
   
<p> where "::FFFF:d.d.d.d" and "::d.d.d.d" are, respectively, the
 
*
   
general forms of an IPv4-mapped IPv6 address and an
 
*
   
IPv4-compatible IPv6 address. Note that the IPv4 portion must be
 
*
   
in the "d.d.d.d" form. The following forms are invalid:
 
*
 
*
   
<blockquote><table cellpadding=0 cellspacing=0 summary="layout">
 
*
   
<tr><td>{@code ::FFFF:d.d.d}<td></tr>
 
*
   
<tr><td>{@code ::FFFF:d.d}<td></tr>
 
*
   
<tr><td>{@code ::d.d.d}<td></tr>
 
*
   
<tr><td>{@code ::d.d}<td></tr>
 
*
   
</table></blockquote>
 
*
 
*
   
<p> The following form:
 
*
 
*
   
<blockquote><table cellpadding=0 cellspacing=0 summary="layout">
 
*
   
<tr><td>{@code ::FFFF:d}<td></tr>
 
*
   
</table></blockquote>
 
*
 
*
   
<p> is valid, however it is an unconventional representation of
 
*
   
the IPv4-compatible IPv6 address,
 
*
 
*
   
<blockquote><table cellpadding=0 cellspacing=0 summary="layout">
 
*
   
<tr><td>{@code ::255.255.0.d}<td></tr>
 
*
   
</table></blockquote>
 
*
 
*
   
<p> while "::d" corresponds to the general IPv6 address
 
*
   
"0:0:0:0:0:0:0:d".</li>
 
* </ol>
 
*
 
* <p> For methods that return a textual representation as output
 
* value, the full form is used. Inet6Address will return the full
 
* form because it is unambiguous when used in combination with other
 
* textual data.
 
*
 
* <h4> Special IPv6 address </h4>
 
*
 
* <blockquote>
 
* <table cellspacing=2 summary="Description of IPv4-mapped address">
 
* <tr><th valign=top><i>IPv4-mapped address</i></th>
 
*
         
<td>Of the form::ffff:w.x.y.z, this IPv6 address is used to
 
*
         
represent an IPv4 address. It allows the native program to
 
*
         
use the same address data structure and also the same
 
*
         
socket when communicating with both IPv4 and IPv6 nodes.
 
*
 
*
         
<p>In InetAddress and Inet6Address, it is used for internal
 
*
         
representation; it has no functional role. Java will never
 
*
         
return an IPv4-mapped address.
  
These classes can take an
 
*
         
IPv4-mapped address as input, both in byte array and text
 
*
         
representation. However, it will be converted into an IPv4
 
*
         
address.</td></tr>
 
* </table></blockquote>
 
*
 
* <h4><A NAME="scoped">Textual representation of IPv6 scoped addresses</a></h4>
 
*
 
* <p> The textual representation of IPv6 addresses as described above can be
 
* extended to specify IPv6 scoped addresses. This extension to the basic
 
* addressing architecture is described in [draft-ietf-ipngwg-scoping-arch-04.txt].
 
*
 
* <p> Because link-local and site-local addresses are non-global, it is possible
 
* that different hosts may have the same destination address and may be
 
* reachable through different interfaces on the same originating system. In
 
* this case, the originating system is said to be connected to multiple zones
 
* of the same scope. In order to disambiguate which is the intended destination
 
* zone, it is possible to append a zone identifier (or <i>scope_id</i>) to an
 
* IPv6 address.
 
*
 
* <p> The general format for specifying the <i>scope_id</i> is the following:
 
*
 
* <blockquote><i>IPv6-address</i>%<i>scope_id</i></blockquote>
 
* <p> The IPv6-address is a literal IPv6 address as described above.
 
* The <i>scope_id</i> refers to an interface on the local system, and it can be
 
* specified in two ways.
 
* <ol><li><i>As a numeric identifier.</i> This must be a positive integer
 
* that identifies the particular interface and scope as understood by the
 
* system. Usually, the numeric values can be determined through administration
 
* tools on the system. Each interface may have multiple values, one for each
 
* scope. If the scope is unspecified, then the default value used is zero.</li>
 
* <li><i>As a string.</i> This must be the exact string that is returned by
 
* {@link java.net.NetworkInterface#getName()} for the particular interface in
 
* question. When an Inet6Address is created in this way, the numeric scope-id
 
* is determined at the time the object is created by querying the relevant
 
* NetworkInterface.</li></ol>
 
*
 
* <p> Note also, that the numeric <i>scope_id</i> can be retrieved from
 
* Inet6Address instances returned from the NetworkInterface class. This can be
 
* used to find out the current scope ids configured on the system.
 
* @since 1.4
 
*/


public final
class
Inet6Address extends InetAddress {
    
final static int INADDRSZ = 16;

    
/*
     
* cached scope_id - for link-local address use only.
     
*/

    
private transient int cached_scope_id;
  
// 0

    
private class Inet6AddressHolder {

        
private Inet6AddressHolder() {
            
ipaddress = new byte[INADDRSZ];
        
}

        
private Inet6AddressHolder(
            
byte[] ipaddress, int scope_id, boolean scope_id_set,
            
NetworkInterface ifname, boolean scope_ifname_set)
        
{
            
this.ipaddress = ipaddress;
            
this.scope_id = scope_id;
            
this.scope_id_set = scope_id_set;
            
this.scope_ifname_set = scope_ifname_set;
            
this.scope_ifname = ifname;
        
}

        
/**
         
* Holds a 128-bit (16 bytes) IPv6 address.
         
*/
        
byte[] ipaddress;

        
/**
         
* scope_id. The scope specified when the object is created. If the object
         
* is created with an interface name, then the scope_id is not determined
         
* until the time it is needed.
         
*/

        
int scope_id;
  
// 0

        
/**
         
* This will be set to true when the scope_id field contains a valid
         
* integer scope_id.
         
*/

        
boolean scope_id_set;
  
// false

        
/**
         
* scoped interface. scope_id is derived from this as the scope_id of the first
         
* address whose scope is the same as this address for the named interface.
         
*/

        
NetworkInterface scope_ifname;
  
// null

        
/**
         
* set if the object is constructed with a scoped
         
* interface instead of a numeric scope id.
         
*/

        
boolean scope_ifname_set; // false;

        
void setAddr(byte addr[]) {
            
if (addr.length == INADDRSZ) { // normal IPv6 address
                
System.arraycopy(addr, 0, ipaddress, 0, INADDRSZ);
            
}
        
}

        
void init(byte addr[], int scope_id) {
            
setAddr(addr);

            
if (scope_id >= 0) {
                
this.scope_id = scope_id;
                
this.scope_id_set = true;
            
}
        
}

        
void init(byte addr[], NetworkInterface nif)
            
throws UnknownHostException
        
{
            
setAddr(addr);

            
if (nif != null) {
                
this.scope_id = deriveNumericScope(ipaddress, nif);
                
this.scope_id_set = true;
                
this.scope_ifname = nif;
                
this.scope_ifname_set = true;
            
}
        
}

        
String getHostAddress() {
            
String s = numericToTextFormat(ipaddress);
            
if (scope_ifname != null) { /* must check this first */
                
s = s + "%" + scope_ifname.getName();
            
} else if (scope_id_set) {
                
s = s + "%" + scope_id;
            
}
            
return s;
        
}

        
public boolean equals(Object o) {
            
if (! (o instanceof Inet6AddressHolder)) {
                
return false;
            
}
            
Inet6AddressHolder that = (Inet6AddressHolder)o;

            
return Arrays.equals(this.ipaddress, that.ipaddress);
        
}

        
public int hashCode() {
            
if (ipaddress != null) {

                
int hash = 0;
                
int i=0;
                
while (i<INADDRSZ) {
                    
int j=0;
                    
int component=0;
                    
while (j<4 && i<INADDRSZ) {
                        
component = (component << 8) + ipaddress[i];
                        
j++;
                        
i++;
                    
}
                    
hash += component;
                
}
                
return hash;

            
} else {
                
return 0;
            
}
        
}

        
boolean isIPv4CompatibleAddress() {
            
if ((ipaddress[0] == 0x00) && (ipaddress[1] == 0x00) &&
                
(ipaddress[2] == 0x00) && (ipaddress[3] == 0x00) &&
                
(ipaddress[4] == 0x00) && (ipaddress[5] == 0x00) &&
                
(ipaddress[6] == 0x00) && (ipaddress[7] == 0x00) &&
                
(ipaddress[8] == 0x00) && (ipaddress[9] == 0x00) &&
                
(ipaddress[10] == 0x00) && (ipaddress[11] == 0x00))
  
{
                
return true;
            
}
            
return false;
        
}

        
boolean isMulticastAddress() {
            
return ((ipaddress[0] & 0xff) == 0xff);
        
}

        
boolean isAnyLocalAddress() {
            
byte test = 0x00;
            
for (int i = 0; i < INADDRSZ; i++) {
                
test |= ipaddress[i];
            
}
            
return (test == 0x00);
        
}

        
boolean isLoopbackAddress() {
            
byte test = 0x00;
            
for (int i = 0; i < 15; i++) {
                
test |= ipaddress[i];
            
}
            
return (test == 0x00) && (ipaddress[15] == 0x01);
        
}

        
boolean isLinkLocalAddress() {
            
return ((ipaddress[0] & 0xff) == 0xfe
                    
&& (ipaddress[1] & 0xc0) == 0x80);
        
}


        
boolean isSiteLocalAddress() {
            
return ((ipaddress[0] & 0xff) == 0xfe
                    
&& (ipaddress[1] & 0xc0) == 0xc0);
        
}

        
boolean isMCGlobal() {
            
return ((ipaddress[0] & 0xff) == 0xff
                    
&& (ipaddress[1] & 0x0f) == 0x0e);
        
}

        
boolean isMCNodeLocal() {
            
return ((ipaddress[0] & 0xff) == 0xff
                    
&& (ipaddress[1] & 0x0f) == 0x01);
        
}

        
boolean isMCLinkLocal() {
            
return ((ipaddress[0] & 0xff) == 0xff
                    
&& (ipaddress[1] & 0x0f) == 0x02);
        
}

        
boolean isMCSiteLocal() {
            
return ((ipaddress[0] & 0xff) == 0xff
                    
&& (ipaddress[1] & 0x0f) == 0x05);
        
}

        
boolean isMCOrgLocal() {
            
return ((ipaddress[0] & 0xff) == 0xff
                    
&& (ipaddress[1] & 0x0f) == 0x08);
        
}
    
}

    
private final transient Inet6AddressHolder holder6;

    
private static final long serialVersionUID = 6880410070516793377L;

    
// Perform native initialization
    
static { init(); }

    
Inet6Address() {
        
super();
        
holder.init(null, IPv6);
        
holder6 = new Inet6AddressHolder();
    
}

    
/* checking of value for scope_id should be done by caller
     
* scope_id must be >= 0, or -1 to indicate not being set
     
*/

    
Inet6Address(String hostName, byte addr[], int scope_id) {
        
holder.init(hostName, IPv6);
        
holder6 = new Inet6AddressHolder();
        
holder6.init(addr, scope_id);
    
}

    
Inet6Address(String hostName, byte addr[]) {
        
holder6 = new Inet6AddressHolder();
        
try {
            
initif (hostName, addr, null);
        
} catch (UnknownHostException e) {} /* cant happen if ifname is null */
    
}

    
Inet6Address (String hostName, byte addr[], NetworkInterface nif)
        
throws UnknownHostException
    
{
        
holder6 = new Inet6AddressHolder();
        
initif (hostName, addr, nif);
    
}

    
Inet6Address (String hostName, byte addr[], String ifname)
        
throws UnknownHostException
    
{
        
holder6 = new Inet6AddressHolder();
        
initstr (hostName, addr, ifname);
    
}

    
/**
     
* Create an Inet6Address in the exact manner of {@link
     
* InetAddress#getByAddress(String,byte[])} except that the IPv6 scope_id is
     
* set to the value corresponding to the given interface for the address
     
* type specified in {@code addr}. The call will fail with an
     
* UnknownHostException if the given interface does not have a numeric
     
* scope_id assigned for the given address type (eg. link-local or site-local).
     
* See
 
<a href="Inet6Address.html#scoped">here</a>
 
for a description of IPv6
     
* scoped addresses.
     
*
     
* @param host the specified host
     
* @param addr the raw IP address in network byte order
     
* @param nif an interface this address must be associated with.
     
* @return
  
an Inet6Address object created from the raw IP address.
     
* @throws
  
UnknownHostException
     
*
          
if IP address is of illegal length, or if the interface does not
     
*
          
have a numeric scope_id assigned for the given address type.
     
*
     
* @since 1.5
     
*/

    
public static Inet6Address getByAddress(String host, byte[] addr,
                                            
NetworkInterface nif)
        
throws UnknownHostException
    
{
        
if (host != null && host.length() > 0 && host.charAt(0) == '[') {
            
if (host.charAt(host.length()-1) == ']') {
                
host = host.substring(1, host.length() -1);
            
}
        
}
        
if (addr != null) {
            
if (addr.length == Inet6Address.INADDRSZ) {
                
return new Inet6Address(host, addr, nif);
            
}
        
}
        
throw new UnknownHostException("addr is of illegal length");
    
}

    
/**
     
* Create an Inet6Address in the exact manner of {@link
     
* InetAddress#getByAddress(String,byte[])} except that the IPv6 scope_id is
     
* set to the given numeric value. The scope_id is not checked to determine
     
* if it corresponds to any interface on the system.
     
* See
 
<a href="Inet6Address.html#scoped">here</a>
 
for a description of IPv6
     
* scoped addresses.
     
*
     
* @param host the specified host
     
* @param addr the raw IP address in network byte order
     
* @param scope_id the numeric scope_id for the address.
     
* @return
  
an Inet6Address object created from the raw IP address.
     
* @throws
  
UnknownHostExceptionif IP address is of illegal length.
     
*
     
* @since 1.5
     
*/

    
public static Inet6Address getByAddress(String host, byte[] addr,
                                            
int scope_id)
        
throws UnknownHostException
    
{
        
if (host != null && host.length() > 0 && host.charAt(0) == '[') {
            
if (host.charAt(host.length()-1) == ']') {
                
host = host.substring(1, host.length() -1);
            
}
        
}
        
if (addr != null) {
            
if (addr.length == Inet6Address.INADDRSZ) {
                
return new Inet6Address(host, addr, scope_id);
            
}
        
}
        
throw new UnknownHostException("addr is of illegal length");
    
}

    
private void initstr(String hostName, byte addr[], String ifname)
        
throws UnknownHostException
    
{
        
try {
            
NetworkInterface nif = NetworkInterface.getByName (ifname);
            
if (nif == null) {
                
throw new UnknownHostException ("no such interface " + ifname);
            
}
            
initif (hostName, addr, nif);
        
} catch (SocketException e) {
            
throw new UnknownHostException ("SocketException thrown" + ifname);
        
}
    
}

    
private void initif(String hostName, byte addr[], NetworkInterface nif)
        
throws UnknownHostException
    
{
        
int family = -1;
        
holder6.init(addr, nif);

        
if (addr.length == INADDRSZ) { // normal IPv6 address
            
family = IPv6;
        
}
        
holder.init(hostName, family);
    
}

    
/* check the two Ipv6 addresses and return false if they are both
     
* non global address types, but not the same.
     
* (ie. one is sitelocal and the other linklocal)
     
* return true otherwise.
     
*/


    
private static boolean isDifferentLocalAddressType(
        
byte[] thisAddr, byte[] otherAddr) {

        
if (Inet6Address.isLinkLocalAddress(thisAddr) &&
                
!Inet6Address.isLinkLocalAddress(otherAddr)) {
            
return false;
        
}
        
if (Inet6Address.isSiteLocalAddress(thisAddr) &&
                
!Inet6Address.isSiteLocalAddress(otherAddr)) {
            
return false;
        
}
        
return true;
    
}

    
private static int deriveNumericScope (byte[] thisAddr, NetworkInterface ifc) throws UnknownHostException {
        
Enumeration<InetAddress> addresses = ifc.getInetAddresses();
        
while (addresses.hasMoreElements()) {
            
InetAddress addr = addresses.nextElement();
            
if (!(addr instanceof Inet6Address)) {
                
continue;
            
}
            
Inet6Address ia6_addr = (Inet6Address)addr;
            
/* check if site or link local prefixes match */
            
if (!isDifferentLocalAddressType(thisAddr, ia6_addr.getAddress())){
                
/* type not the same, so carry on searching */
                
continue;
            
}
            
/* found a matching address - return its scope_id */
            
return ia6_addr.getScopeId();
        
}
        
throw new UnknownHostException ("no scope_id found");
    
}

    
private int deriveNumericScope (String ifname) throws UnknownHostException {
        
Enumeration<NetworkInterface> en;
        
try {
            
en = NetworkInterface.getNetworkInterfaces();
        
} catch (SocketException e) {
            
throw new UnknownHostException ("could not enumerate local network interfaces");
        
}
        
while (en.hasMoreElements()) {
            
NetworkInterface ifc = en.nextElement();
            
if (ifc.getName().equals (ifname)) {
                
return deriveNumericScope(holder6.ipaddress, ifc);
            
}
        
}
        
throw new UnknownHostException ("No matching address found for interface : " +ifname);
    
}

    
/**
     
* @serialField ipaddress byte[]
     
* @serialField scope_id int
     
* @serialField scope_id_set boolean
     
* @serialField scope_ifname_set boolean
     
* @serialField ifname String
     
*/


    
private static final ObjectStreamField[] serialPersistentFields = {
         
new ObjectStreamField("ipaddress", byte[].class),
         
new ObjectStreamField("scope_id", int.class),
         
new ObjectStreamField("scope_id_set", boolean.class),
         
new ObjectStreamField("scope_ifname_set", boolean.class),
         
new ObjectStreamField("ifname", String.class)
    
};

    
private static final long FIELDS_OFFSET;
    
private static final sun.misc.Unsafe UNSAFE;

    
static {
        
try {
            
sun.misc.Unsafe unsafe = sun.misc.Unsafe.getUnsafe();
            
FIELDS_OFFSET = unsafe.objectFieldOffset(
                    
Inet6Address.class.getDeclaredField("holder6"));
            
UNSAFE = unsafe;
        
} catch (ReflectiveOperationException e) {
            
throw new Error(e);
        
}
    
}

    
/**
     
* restore the state of this object from stream
     
* including the scope information, only if the
     
* scoped interface name is valid on this system
     
*/

    
private void readObject(ObjectInputStream s)
        
throws IOException, ClassNotFoundException {
        
NetworkInterface scope_ifname = null;

        
if (getClass().getClassLoader() != null) {
            
throw new SecurityException ("invalid address type");
        
}

        
ObjectInputStream.GetField gf = s.readFields();
        
byte[] ipaddress = (byte[])gf.get("ipaddress", null);
        
int scope_id = (int)gf.get("scope_id", -1);
        
boolean scope_id_set = (boolean)gf.get("scope_id_set", false);
        
boolean scope_ifname_set = (boolean)gf.get("scope_ifname_set", false);
        
String ifname = (String)gf.get("ifname", null);

        
if (ifname != null && !"".equals (ifname)) {
            
try {
                
scope_ifname = NetworkInterface.getByName(ifname);
                
if (scope_ifname == null) {
                    
/* the interface does not exist on this system, so we clear
                     
* the scope information completely */

                    
scope_id_set = false;
                    
scope_ifname_set = false;
                    
scope_id = 0;
                
} else {
                    
scope_ifname_set = true;
                    
try {
                        
scope_id = deriveNumericScope (ipaddress, scope_ifname);
                    
} catch (UnknownHostException e) {
                        
// typically should not happen, but it may be that
                        
// the machine being used for deserialization has
                        
// the same interface name but without IPv6 configured.
                    
}
                
}
            
} catch (SocketException e) {}
        
}

        
/* if ifname was not supplied, then the numeric info is used */

        
ipaddress = ipaddress.clone();

        
// Check that our invariants are satisfied
        
if (ipaddress.length != INADDRSZ) {
            
throw new InvalidObjectException("invalid address length: "+
                                             
ipaddress.length);
        
}

        
if (holder.getFamily() != IPv6) {
            
throw new InvalidObjectException("invalid address family type");
        
}

        
Inet6AddressHolder h = new Inet6AddressHolder(
            
ipaddress, scope_id, scope_id_set, scope_ifname, scope_ifname_set
        
);

        
UNSAFE.putObject(this, FIELDS_OFFSET, h);
    
}

    
/**
     
* default behavior is overridden in order to write the
     
* scope_ifname field as a String, rather than a NetworkInterface
     
* which is not serializable
     
*/

    
private synchronized void writeObject(ObjectOutputStream s)
        
throws IOException
    
{
            
String ifname = null;

        
if (holder6.scope_ifname != null) {
            
ifname = holder6.scope_ifname.getName();
            
holder6.scope_ifname_set = true;
        
}
        
ObjectOutputStream.PutField pfields = s.putFields();
        
pfields.put("ipaddress", holder6.ipaddress);
        
pfields.put("scope_id", holder6.scope_id);
        
pfields.put("scope_id_set", holder6.scope_id_set);
        
pfields.put("scope_ifname_set", holder6.scope_ifname_set);
        
pfields.put("ifname", ifname);
        
s.writeFields();
    
}

    
/**
     
* Utility routine to check if the InetAddress is an IP multicast
     
* address. 11111111 at the start of the address identifies the
     
* address as being a multicast address.
     
*
     
* @return a {@code boolean} indicating if the InetAddress is an IP
     
*
         
multicast address
     
*
     
* @since JDK1.1
     
*/

    
@Override
    
public boolean isMulticastAddress() {
        
return holder6.isMulticastAddress();
    
}

    
/**
     
* Utility routine to check if the InetAddress in a wildcard address.
     
*
     
* @return a {@code boolean} indicating if the Inetaddress is
     
*
         
a wildcard address.
     
*
     
* @since 1.4
     
*/

    
@Override
    
public boolean isAnyLocalAddress() {
        
return holder6.isAnyLocalAddress();
    
}

    
/**
     
* Utility routine to check if the InetAddress is a loopback address.
     
*
     
* @return a {@code boolean} indicating if the InetAddress is a loopback
     
*
         
address; or false otherwise.
     
*
     
* @since 1.4
     
*/

    
@Override
    
public boolean isLoopbackAddress() {
        
return holder6.isLoopbackAddress();
    
}

    
/**
     
* Utility routine to check if the InetAddress is an link local address.
     
*
     
* @return a {@code boolean} indicating if the InetAddress is a link local
     
*
         
address; or false if address is not a link local unicast address.
     
*
     
* @since 1.4
     
*/

    
@Override
    
public boolean isLinkLocalAddress() {
        
return holder6.isLinkLocalAddress();
    
}

    
/* static version of above */
    
static boolean isLinkLocalAddress(byte[] ipaddress) {
        
return ((ipaddress[0] & 0xff) == 0xfe
                
&& (ipaddress[1] & 0xc0) == 0x80);
    
}

    
/**
     
* Utility routine to check if the InetAddress is a site local address.
     
*
     
* @return a {@code boolean} indicating if the InetAddress is a site local
     
*
         
address; or false if address is not a site local unicast address.
     
*
     
* @since 1.4
     
*/

    
@Override
    
public boolean isSiteLocalAddress() {
        
return holder6.isSiteLocalAddress();
    
}

    
/* static version of above */
    
static boolean isSiteLocalAddress(byte[] ipaddress) {
        
return ((ipaddress[0] & 0xff) == 0xfe
                
&& (ipaddress[1] & 0xc0) == 0xc0);
    
}

    
/**
     
* Utility routine to check if the multicast address has global scope.
     
*
     
* @return a {@code boolean} indicating if the address has is a multicast
     
*
         
address of global scope, false if it is not of global scope or
     
*
         
it is not a multicast address
     
*
     
* @since 1.4
     
*/

    
@Override
    
public boolean isMCGlobal() {
        
return holder6.isMCGlobal();
    
}

    
/**
     
* Utility routine to check if the multicast address has node scope.
     
*
     
* @return a {@code boolean} indicating if the address has is a multicast
     
*
         
address of node-local scope, false if it is not of node-local
     
*
         
scope or it is not a multicast address
     
*
     
* @since 1.4
     
*/

    
@Override
    
public boolean isMCNodeLocal() {
        
return holder6.isMCNodeLocal();
    
}

    
/**
     
* Utility routine to check if the multicast address has link scope.
     
*
     
* @return a {@code boolean} indicating if the address has is a multicast
     
*
         
address of link-local scope, false if it is not of link-local
     
*
         
scope or it is not a multicast address
     
*
     
* @since 1.4
     
*/

    
@Override
    
public boolean isMCLinkLocal() {
        
return holder6.isMCLinkLocal();
    
}

    
/**
     
* Utility routine to check if the multicast address has site scope.
     
*
     
* @return a {@code boolean} indicating if the address has is a multicast
     
*
         
address of site-local scope, false if it is not
  
of site-local
     
*
         
scope or it is not a multicast address
     
*
     
* @since 1.4
     
*/

    
@Override
    
public boolean isMCSiteLocal() {
        
return holder6.isMCSiteLocal();
    
}

    
/**
     
* Utility routine to check if the multicast address has organization scope.
     
*
     
* @return a {@code boolean} indicating if the address has is a multicast
     
*
         
address of organization-local scope, false if it is not of
     
*
         
organization-local scope or it is not a multicast address
     
*
     
* @since 1.4
     
*/

    
@Override
    
public boolean isMCOrgLocal() {
        
return holder6.isMCOrgLocal();
    
}
    
/**
     
* Returns the raw IP address of this {@code InetAddress} object. The result
     
* is in network byte order: the highest order byte of the address is in
     
* {@code getAddress()[0]}.
     
*
     
* @return
  
the raw IP address of this object.
     
*/

    
@Override
    
public byte[] getAddress() {
        
return holder6.ipaddress.clone();
    
}

    
/**
     
* Returns the numeric scopeId, if this instance is associated with
     
* an interface. If no scoped_id is set, the returned value is zero.
     
*
     
* @return the scopeId, or zero if not set.
     
*
     
* @since 1.5
     
*/

     
public int getScopeId() {
        
return holder6.scope_id;
     
}

    
/**
     
* Returns the scoped interface, if this instance was created with
     
* with a scoped interface.
     
*
     
* @return the scoped interface, or null if not set.
     
* @since 1.5
     
*/

     
public NetworkInterface getScopedInterface() {
        
return holder6.scope_ifname;
     
}

    
/**
     
* Returns the IP address string in textual presentation. If the instance
     
* was created specifying a scope identifier then the scope id is appended
     
* to the IP address preceded by a "%" (per-cent) character. This can be
     
* either a numeric value or a string, depending on which was used to create
     
* the instance.
     
*
     
* @return
  
the raw IP address in a string format.
     
*/

    
@Override
    
public String getHostAddress() {
        
return holder6.getHostAddress();
    
}

    
/**
     
* Returns a hashcode for this IP address.
     
*
     
* @return
  
a hash code value for this IP address.
     
*/

    
@Override
    
public int hashCode() {
        
return holder6.hashCode();
    
}

    
/**
     
* Compares this object against the specified object. The result is {@code
     
* true} if and only if the argument is not {@code null} and it represents
     
* the same IP address as this object.
     
*
     
* <p> Two instances of {@code InetAddress} represent the same IP address
     
* if the length of the byte arrays returned by {@code getAddress} is the
     
* same for both, and each of the array components is the same for the byte
     
* arrays.
     
*
     
* @param
   
objthe object to compare against.
     
*
     
* @return
  
{@code true} if the objects are the same; {@code false} otherwise.
     
*
     
* @seejava.net.InetAddress#getAddress()
     
*/

    
@Override
    
public boolean equals(Object obj) {
        
if (obj == null || !(obj instanceof Inet6Address))
            
return false;

        
Inet6Address inetAddr = (Inet6Address)obj;

        
return holder6.equals(inetAddr.holder6);
    
}

    
/**
     
* Utility routine to check if the InetAddress is an
     
* IPv4 compatible IPv6 address.
     
*
     
* @return a {@code boolean} indicating if the InetAddress is an IPv4
     
*
         
compatible IPv6 address; or false if address is IPv4 address.
     
*
     
* @since 1.4
     
*/

    
public boolean isIPv4CompatibleAddress() {
        
return holder6.isIPv4CompatibleAddress();
    
}

    
// Utilities
    
private final static int INT16SZ = 2;

    
/*
     
* Convert IPv6 binary address into presentation (printable) format.
     
*
     
* @param src a byte array representing the IPv6 numeric address
     
* @return a String representing an IPv6 address in
     
*
         
textual representation format
     
* @since 1.4
     
*/

    
static String numericToTextFormat(byte[] src) {
        
StringBuilder sb = new StringBuilder(39);
        
for (int i = 0; i < (INADDRSZ / INT16SZ); i++) {
            
sb.append(Integer.toHexString(((src[i<<1]<<8) & 0xff00)
                                          
| (src[(i<<1)+1] & 0xff)));
            
if (i < (INADDRSZ / INT16SZ) -1 ) {
               
sb.append(":");
            
}
        
}
        
return sb.toString();
    
}

    
/**
     
* Perform class load-time initializations.
     
*/
    
private static native void init();
}