/* * Copyright (C) 2014 The Android Open Source Project * Copyright (c) 2000, 2010, 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.ObjectInputStream; import java.io.IOException; import java.io.InvalidObjectException; import java.util.Enumeration; import libcore.io.Libcore; import static android.system.OsConstants.*; /** * This class represents an Internet Protocol version 6 (IPv6) address. * Defined by * RFC 2373: IP Version 6 Addressing Architecture. * *

Textual representation of IP addresses

* * Textual representation of IPv6 address used as input to methods * takes one of the following forms: * *
    *
  1. 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.

  2. * *
  3. 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
    * *
  4. 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".

  5. *
* *

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. * *

Special IPv6 address

* *
* * *
IPv4-mapped addressOf 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.

*

*

Textual representation of IPv6 scoped addresses

*

* 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. *

  1. As a numeric identifier. 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.
  2. *

  3. As a string. 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.
  4. *

* 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 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 { Enumeration 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 (!differentLocalAddressTypes(ia6_addr)){ /* type not the same, so carry on searching */ continue; } /* found a matching address - return its scope_id */ return ia6_addr.scope_id; } throw new UnknownHostException ("no scope_id found"); } private int deriveNumericScope (String ifname) throws UnknownHostException { Enumeration 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)) { Enumeration addresses = ifc.getInetAddresses(); while (addresses.hasMoreElements()) { InetAddress addr = (InetAddress)addresses.nextElement(); if (!(addr instanceof Inet6Address)) { continue; } Inet6Address ia6_addr = (Inet6Address)addr; /* check if site or link local prefixes match */ if (!differentLocalAddressTypes(ia6_addr)){ /* type not the same, so carry on searching */ continue; } /* found a matching address - return its scope_id */ return ia6_addr.scope_id; } } } throw new UnknownHostException ("No matching address found for interface : " +ifname); } /** * 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 { scope_ifname = null; scope_ifname_set = false; if (getClass().getClassLoader() != Class.class.getClassLoader()) { throw new SecurityException ("invalid address type"); } s.defaultReadObject(); 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 { try { scope_id = deriveNumericScope (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() != AF_INET6) { throw new InvalidObjectException("invalid address family type"); } } /** * 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 boolean 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 (itrue if and only if the argument is * not null and it represents the same IP address as * this object. *

* Two instances of 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(); } }