| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * 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.ObjectStreamException; |
| import static android.system.OsConstants.*; |
| |
| /** |
| * This class represents an Internet Protocol version 4 (IPv4) address. |
| * Defined by <a href="http://www.ietf.org/rfc/rfc790.txt"> |
| * <i>RFC 790: Assigned Numbers</i></a>, |
| * <a href="http://www.ietf.org/rfc/rfc1918.txt"> |
| * <i>RFC 1918: Address Allocation for Private Internets</i></a>, |
| * and <a href="http://www.ietf.org/rfc/rfc2365.txt"><i>RFC 2365: |
| * Administratively Scoped IP Multicast</i></a> |
| * |
| * <h3> <a id="format">Textual representation of IP addresses</a> </h3> |
| * |
| * Textual representation of IPv4 address used as input to methods |
| * takes one of the following forms: |
| * |
| * <blockquote><ul style="list-style-type:none"> |
| * <li>{@code d.d.d.d}</li> |
| * <li>{@code d.d.d}</li> |
| * <li>{@code d.d}</li> |
| * <li>{@code d}</li> |
| * </ul></blockquote> |
| * |
| * <p> When four parts are specified, each is interpreted as a byte of |
| * data and assigned, from left to right, to the four bytes of an IPv4 |
| * address. |
| |
| * <p> When a three part address is specified, the last part is |
| * interpreted as a 16-bit quantity and placed in the right most two |
| * bytes of the network address. This makes the three part address |
| * format convenient for specifying Class B net- work addresses as |
| * 128.net.host. |
| * |
| * <p> When a two part address is supplied, the last part is |
| * interpreted as a 24-bit quantity and placed in the right most three |
| * bytes of the network address. This makes the two part address |
| * format convenient for specifying Class A network addresses as |
| * net.host. |
| * |
| * <p> When only one part is given, the value is stored directly in |
| * the network address without any byte rearrangement. |
| * |
| * <p> For methods that return a textual representation as output |
| * value, the first form, i.e. a dotted-quad string, is used. |
| * |
| * <h4> The Scope of a Multicast Address </h4> |
| * |
| * Historically the IPv4 TTL field in the IP header has doubled as a |
| * multicast scope field: a TTL of 0 means node-local, 1 means |
| * link-local, up through 32 means site-local, up through 64 means |
| * region-local, up through 128 means continent-local, and up through |
| * 255 are global. However, the administrative scoping is preferred. |
| * Please refer to <a href="http://www.ietf.org/rfc/rfc2365.txt"> |
| * <i>RFC 2365: Administratively Scoped IP Multicast</i></a> |
| * @since 1.4 |
| */ |
| |
| public final |
| class Inet4Address extends InetAddress { |
| static final int INADDRSZ = 4; |
| |
| /** use serialVersionUID from InetAddress, but Inet4Address instance |
| * is always replaced by an InetAddress instance before being |
| * serialized */ |
| private static final long serialVersionUID = 3286316764910316507L; |
| |
| // BEGIN Android-added: Define special-purpose IPv4 address. |
| /** |
| * Reserved address for {@code INADDR_ANY}, to specify any IPv4 address at all. |
| * |
| * @hide |
| */ |
| public static final InetAddress ANY = new Inet4Address(null, new byte[] { 0, 0, 0, 0 }); |
| |
| /** |
| * Broadcast address to transmit to all devices on network. |
| * |
| * @hide |
| */ |
| public static final InetAddress ALL = |
| new Inet4Address(null, new byte[] { (byte) 255, (byte) 255, |
| (byte) 255, (byte) 255 }); |
| |
| /** |
| * Loopback address to the local host. |
| * |
| * @hide |
| */ |
| public static final InetAddress LOOPBACK = |
| new Inet4Address("localhost", new byte[] { 127, 0, 0, 1 }); |
| // END Android-added: Define special-purpose IPv4 address. |
| |
| |
| // BEGIN Android-removed: Android doesn't need to call native init. |
| /* |
| * Perform initializations. |
| * |
| static { |
| init(); |
| } |
| */ |
| // END Android-removed: Android doesn't need to call native init. |
| Inet4Address() { |
| super(); |
| holder().hostName = null; |
| holder().address = 0; |
| holder().family = AF_INET; |
| } |
| |
| Inet4Address(String hostName, byte addr[]) { |
| holder().hostName = hostName; |
| holder().family = AF_INET; |
| if (addr != null) { |
| if (addr.length == INADDRSZ) { |
| int address = addr[3] & 0xFF; |
| address |= ((addr[2] << 8) & 0xFF00); |
| address |= ((addr[1] << 16) & 0xFF0000); |
| address |= ((addr[0] << 24) & 0xFF000000); |
| holder().address = address; |
| } |
| } |
| holder().originalHostName = hostName; |
| } |
| Inet4Address(String hostName, int address) { |
| holder().hostName = hostName; |
| holder().family = AF_INET; |
| holder().address = address; |
| holder().originalHostName = hostName; |
| } |
| |
| /** |
| * Replaces the object to be serialized with an InetAddress object. |
| * |
| * @return the alternate object to be serialized. |
| * |
| * @throws ObjectStreamException if a new object replacing this |
| * object could not be created |
| */ |
| private Object writeReplace() throws ObjectStreamException { |
| // will replace the to be serialized 'this' object |
| InetAddress inet = new InetAddress(); |
| inet.holder().hostName = holder().getHostName(); |
| inet.holder().address = holder().getAddress(); |
| |
| /** |
| * Prior to 1.4 an InetAddress was created with a family |
| * based on the platform AF_INET value (usually 2). |
| * For compatibility reasons we must therefore write the |
| * the InetAddress with this family. |
| */ |
| inet.holder().family = 2; |
| |
| return inet; |
| } |
| |
| /** |
| * Utility routine to check if the InetAddress is an |
| * IP multicast address. IP multicast address is a Class D |
| * address i.e first four bits of the address are 1110. |
| * @return a {@code boolean} indicating if the InetAddress is |
| * an IP multicast address |
| */ |
| public boolean isMulticastAddress() { |
| return ((holder().getAddress() & 0xf0000000) == 0xe0000000); |
| } |
| |
| /** |
| * Utility routine to check if the InetAddress is a wildcard address. |
| * @return a {@code boolean} indicating if the Inetaddress is |
| * a wildcard address. |
| */ |
| public boolean isAnyLocalAddress() { |
| return holder().getAddress() == 0; |
| } |
| |
| /** |
| * 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. |
| */ |
| public boolean isLoopbackAddress() { |
| /* 127.x.x.x */ |
| byte[] byteAddr = getAddress(); |
| return byteAddr[0] == 127; |
| } |
| |
| /** |
| * 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. |
| */ |
| public boolean isLinkLocalAddress() { |
| // link-local unicast in IPv4 (169.254.0.0/16) |
| // defined in "Documenting Special Use IPv4 Address Blocks |
| // that have been Registered with IANA" by Bill Manning |
| // draft-manning-dsua-06.txt |
| int address = holder().getAddress(); |
| return (((address >>> 24) & 0xFF) == 169) |
| && (((address >>> 16) & 0xFF) == 254); |
| } |
| |
| /** |
| * 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. |
| */ |
| public boolean isSiteLocalAddress() { |
| // refer to RFC 1918 |
| // 10/8 prefix |
| // 172.16/12 prefix |
| // 192.168/16 prefix |
| int address = holder().getAddress(); |
| return (((address >>> 24) & 0xFF) == 10) |
| || ((((address >>> 24) & 0xFF) == 172) |
| && (((address >>> 16) & 0xF0) == 16)) |
| || ((((address >>> 24) & 0xFF) == 192) |
| && (((address >>> 16) & 0xFF) == 168)); |
| } |
| |
| /** |
| * 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 |
| */ |
| public boolean isMCGlobal() { |
| // 224.0.1.0 to 238.255.255.255 |
| byte[] byteAddr = getAddress(); |
| return ((byteAddr[0] & 0xff) >= 224 && (byteAddr[0] & 0xff) <= 238 ) && |
| !((byteAddr[0] & 0xff) == 224 && byteAddr[1] == 0 && |
| byteAddr[2] == 0); |
| } |
| |
| /** |
| * 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 |
| */ |
| public boolean isMCNodeLocal() { |
| // unless ttl == 0 |
| return false; |
| } |
| |
| /** |
| * 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 |
| */ |
| public boolean isMCLinkLocal() { |
| // 224.0.0/24 prefix and ttl == 1 |
| int address = holder().getAddress(); |
| return (((address >>> 24) & 0xFF) == 224) |
| && (((address >>> 16) & 0xFF) == 0) |
| && (((address >>> 8) & 0xFF) == 0); |
| } |
| |
| /** |
| * 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 |
| */ |
| public boolean isMCSiteLocal() { |
| // 239.255/16 prefix or ttl < 32 |
| int address = holder().getAddress(); |
| return (((address >>> 24) & 0xFF) == 239) |
| && (((address >>> 16) & 0xFF) == 255); |
| } |
| |
| /** |
| * 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 |
| */ |
| public boolean isMCOrgLocal() { |
| // 239.192 - 239.195 |
| int address = holder().getAddress(); |
| return (((address >>> 24) & 0xFF) == 239) |
| && (((address >>> 16) & 0xFF) >= 192) |
| && (((address >>> 16) & 0xFF) <= 195); |
| } |
| |
| /** |
| * 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. |
| */ |
| public byte[] getAddress() { |
| int address = holder().getAddress(); |
| byte[] addr = new byte[INADDRSZ]; |
| |
| addr[0] = (byte) ((address >>> 24) & 0xFF); |
| addr[1] = (byte) ((address >>> 16) & 0xFF); |
| addr[2] = (byte) ((address >>> 8) & 0xFF); |
| addr[3] = (byte) (address & 0xFF); |
| return addr; |
| } |
| |
| /** |
| * Returns the IP address string in textual presentation form. |
| * |
| * @return the raw IP address in a string format. |
| */ |
| public String getHostAddress() { |
| return numericToTextFormat(getAddress()); |
| } |
| |
| /** |
| * Returns a hashcode for this IP address. |
| * |
| * @return a hash code value for this IP address. |
| */ |
| public int hashCode() { |
| return holder().getAddress(); |
| } |
| |
| /** |
| * 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() |
| */ |
| public boolean equals(Object obj) { |
| return (obj != null) && (obj instanceof Inet4Address) && |
| (((InetAddress)obj).holder().getAddress() == holder().getAddress()); |
| } |
| |
| // Utilities |
| |
| /** |
| * Converts IPv4 binary address into a string suitable for presentation. |
| * |
| * @param src a byte array representing an IPv4 numeric address |
| * @return a String representing the IPv4 address in |
| */ |
| static String numericToTextFormat(byte[] src) |
| { |
| return (src[0] & 0xff) + "." + (src[1] & 0xff) + "." + (src[2] & 0xff) + "." + (src[3] & 0xff); |
| } |
| |
| // BEGIN Android-removed: Android doesn't need to call native init. |
| /* |
| * Perform class load-time initializations. |
| * |
| private static native void init(); |
| */ |
| // END Android-removed: Android doesn't need to call native init. |
| } |
