8182487: Add Unsafe.objectFieldOffset(Class, String)
Reviewed-by: dsimms, twisti, bchristi, mgerdin, chegar, psandoz
/*
* Copyright (c) 2000, 2017, 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 2373: IP Version 6 Addressing Architecture</i></a>.
*
* <h3> <a id="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 id="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><ul style="list-style-type:none">
* <li>{@code 1080:0:0:0:8:800:200C:417A}</li>
* </ul></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><ul style="list-style-type:none">
* <li>{@code 1080::8:800:200C:417A}</li>
* </ul></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><ul style="list-style-type:none">
* <li>{@code ::FFFF:129.144.52.38}</li>
* <li>{@code ::129.144.52.38}</li>
* </ul></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><ul style="list-style-type:none">
* <li>{@code ::FFFF:d.d.d}</li>
* <li>{@code ::FFFF:d.d}</li>
* <li>{@code ::d.d.d}</li>
* <li>{@code ::d.d}</li>
* </ul></blockquote>
*
* <p> The following form:
*
* <blockquote><ul style="list-style-type:none">
* <li>{@code ::FFFF:d}</li>
* </ul></blockquote>
*
* <p> is valid, however it is an unconventional representation of
* the IPv4-compatible IPv6 address,
*
* <blockquote><ul style="list-style-type:none">
* <li>{@code ::255.255.0.d}</li>
* </ul></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 class="borderless">
* <caption style="display:none">Description of IPv4-mapped address</caption>
* <tr><th style="vertical-align:top; padding-right:2px"><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 id="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 {
static final 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 UnknownHostException if 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 jdk.internal.misc.Unsafe UNSAFE
= jdk.internal.misc.Unsafe.getUnsafe();
private static final long FIELDS_OFFSET = UNSAFE.objectFieldOffset(
Inet6Address.class, "holder6");
/**
* 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 = gf.get("scope_id", -1);
boolean scope_id_set = gf.get("scope_id_set", false);
boolean scope_ifname_set = 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
*/
@Override
public boolean isMulticastAddress() {
return holder6.isMulticastAddress();
}
/**
* Utility routine to check if the InetAddress is a wildcard address.
*
* @return a {@code boolean} indicating if the Inetaddress is
* a wildcard address.
*/
@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.
*/
@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.
*/
@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.
*/
@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
*/
@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
*/
@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
*/
@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
*/
@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
*/
@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 obj the object to compare against.
*
* @return {@code true} if the objects are the same; {@code false} otherwise.
*
* @see java.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.
*/
public boolean isIPv4CompatibleAddress() {
return holder6.isIPv4CompatibleAddress();
}
// Utilities
private static final 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
*/
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();
}