The preferred form 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, * *
* **
* 1080:0:0:0:8:800:200C:417A
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.
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, * *
* **
* 1080::8:800:200C:417A
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, * *
* **
* ::FFFF:129.144.52.38 * ::129.144.52.38
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: * *
* **
* ::FFFF:d.d.d * ::FFFF:d.d * ::d.d.d * ::d.d
The following form: * *
* **
* ::FFFF:d
is valid, however it is an unconventional representation of * the IPv4-compatible IPv6 address, * *
* **
* ::255.255.0.d
while "::d" corresponds to the general IPv6 address * "0:0:0:0:0:0:0:d".
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. * *
**
* IPv4-mapped address *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. * * 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.
*
* 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]. *
* 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 scope_id) to an IPv6 address. *
* The general format for specifying the scope_id is the following: *
IPv6-address%scope_id*
The IPv6-address is a literal IPv6 address as described above. * The scope_id refers to an interface on the local system, and it can be specified * in two ways. *
*
* Note also, that the numeric scope_id 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;
/** @hide */
public static final InetAddress ANY =
new Inet6Address("::", new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0);
/** @hide */
public static final InetAddress LOOPBACK = new Inet6Address("ip6-localhost",
new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, 0);
/**
* Holds a 128-bit (16 bytes) IPv6 address.
*
* @serial
*/
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.
*/
private int scope_id = 0;
/**
* This will be set to true when the scope_id field contains a valid
* integer scope_id.
*/
private 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.
*/
private transient NetworkInterface scope_ifname = null;
/**
* set if the object is constructed with a scoped interface instead of a
* numeric scope id.
*/
private boolean scope_ifname_set = false;
private static final long serialVersionUID = 6880410070516793377L;
Inet6Address() {
super();
holder().hostName = null;
ipaddress = new byte[INADDRSZ];
holder().family = AF_INET6;
}
/* 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().hostName = hostName;
if (addr.length == INADDRSZ) { // normal IPv6 address
holder().family = AF_INET6;
ipaddress = addr.clone();
}
// Android change, was >= 0.
if (scope_id > 0) {
this.scope_id = scope_id;
scope_id_set = true;
}
}
Inet6Address(String hostName, byte addr[]) {
try {
initif (hostName, addr, null);
} catch (UnknownHostException e) {} /* cant happen if ifname is null */
}
Inet6Address (String hostName, byte addr[], NetworkInterface nif) throws UnknownHostException {
initif (hostName, addr, nif);
}
Inet6Address (String hostName, byte addr[], String ifname) throws UnknownHostException {
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
* Two instances of 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 here 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.
* @exception 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 here 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.
* @exception 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 {
holder().hostName = hostName;
if (addr.length == INADDRSZ) { // normal IPv6 address
holder().family = AF_INET6;
ipaddress = addr.clone();
}
if (nif != null) {
this.scope_ifname = nif;
scope_ifname_set = true;
scope_id = deriveNumericScope (nif);
scope_id_set = true;
}
}
/* 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 boolean differentLocalAddressTypes(Inet6Address other) {
if (isLinkLocalAddress() && !other.isLinkLocalAddress()) {
return false;
}
if (isSiteLocalAddress() && !other.isSiteLocalAddress()) {
return false;
}
return true;
}
private int deriveNumericScope (NetworkInterface ifc) throws UnknownHostException {
Enumerationboolean indicating if the InetAddress is
* an IP multicast address
* @since JDK1.1
*/
@Override
public boolean isMulticastAddress() {
return ((ipaddress[0] & 0xff) == 0xff);
}
/**
* Utility routine to check if the InetAddress in a wildcard address.
* @return a boolean indicating if the Inetaddress is
* a wildcard address.
* @since 1.4
*/
@Override
public boolean isAnyLocalAddress() {
byte test = 0x00;
for (int i = 0; i < INADDRSZ; i++) {
test |= ipaddress[i];
}
return (test == 0x00);
}
/**
* Utility routine to check if the InetAddress is a loopback address.
*
* @return a boolean indicating if the InetAddress is
* a loopback address; or false otherwise.
* @since 1.4
*/
@Override
public boolean isLoopbackAddress() {
byte test = 0x00;
for (int i = 0; i < 15; i++) {
test |= ipaddress[i];
}
return (test == 0x00) && (ipaddress[15] == 0x01);
}
/**
* Utility routine to check if the InetAddress is an link local address.
*
* @return a 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 ((ipaddress[0] & 0xff) == 0xfe
&& (ipaddress[1] & 0xc0) == 0x80);
}
/**
* Utility routine to check if the InetAddress is a site local address.
*
* @return a 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 ((ipaddress[0] & 0xff) == 0xfe
&& (ipaddress[1] & 0xc0) == 0xc0);
}
/**
* Utility routine to check if the multicast address has global scope.
*
* @return a 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 ((ipaddress[0] & 0xff) == 0xff
&& (ipaddress[1] & 0x0f) == 0x0e);
}
/**
* Utility routine to check if the multicast address has node scope.
*
* @return a 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 ((ipaddress[0] & 0xff) == 0xff
&& (ipaddress[1] & 0x0f) == 0x01);
}
/**
* Utility routine to check if the multicast address has link scope.
*
* @return a 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 ((ipaddress[0] & 0xff) == 0xff
&& (ipaddress[1] & 0x0f) == 0x02);
}
/**
* Utility routine to check if the multicast address has site scope.
*
* @return a 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 ((ipaddress[0] & 0xff) == 0xff
&& (ipaddress[1] & 0x0f) == 0x05);
}
/**
* Utility routine to check if the multicast address has organization scope.
*
* @return a 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 ((ipaddress[0] & 0xff) == 0xff
&& (ipaddress[1] & 0x0f) == 0x08);
}
/**
* Returns the raw IP address of this InetAddress
* object. The result is in network byte order: the highest order
* byte of the address is in getAddress()[0].
*
* @return the raw IP address of this object.
*/
@Override
public byte[] getAddress() {
return 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 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 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 createthe instance.
*
* @return the raw IP address in a string format.
*/
@Override
public String getHostAddress() {
/* ----- BEGIN android -----
getnameinfo returns smarter representations
String s = numericToTextFormat(ipaddress);
if (scope_ifname_set) {
s = s + "%" + scope_ifname.getName();
} else if (scope_id_set) {
s = s + "%" + scope_id;
}
return s;*/
return Libcore.os.getnameinfo(this, NI_NUMERICHOST); // Can't throw.
// ----- END android -----
}
/**
* Returns a hashcode for this IP address.
*
* @return a hash code value for this IP address.
*/
@Override
public int hashCode() {
if (ipaddress != null) {
int hash = 0;
int i=0;
while (inull and it represents the same IP address as
* this object.
* InetAddress represent the same IP
* address if the length of the byte arrays returned by
* 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 true if the objects are the same;
* 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;
for (int i = 0; i < INADDRSZ; i++) {
if (ipaddress[i] != inetAddr.ipaddress[i])
return false;
}
return true;
}
/**
* Utility routine to check if the InetAddress is an
* IPv4 compatible IPv6 address.
*
* @return a boolean indicating if the InetAddress is
* an IPv4 compatible IPv6 address; or false if address is IPv4 address.
* @since 1.4
*/
public 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;
}
// 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)
{
StringBuffer sb = new StringBuffer(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();
}
/**
* Following field is only used during (de)/serialization
*/
private String ifname;
/**
* 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(java.io.ObjectOutputStream s)
throws IOException
{
if (scope_ifname_set) {
ifname = scope_ifname.getName();
}
s.defaultWriteObject();
}
}