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578 lines
24 KiB
Java
578 lines
24 KiB
Java
/*
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* Copyright (c) 2000, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.net;
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import sun.net.util.IPAddressUtil;
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import java.io.ObjectStreamException;
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import java.util.Objects;
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/**
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* This class represents an Internet Protocol version 4 (IPv4) address.
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* Defined by <a href="http://www.ietf.org/rfc/rfc790.txt">
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* <i>RFC 790: Assigned Numbers</i></a>,
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* <a href="http://www.ietf.org/rfc/rfc1918.txt">
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* <i>RFC 1918: Address Allocation for Private Internets</i></a>,
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* and <a href="http://www.ietf.org/rfc/rfc2365.txt"><i>RFC 2365:
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* Administratively Scoped IP Multicast</i></a>
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*
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* <h2> <a id="format">Textual representation of IPv4 addresses</a> </h2>
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*
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* Textual representation of IPv4 address used as input to methods
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* takes one of the following forms:
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*
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* <blockquote><ul style="list-style-type:none">
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* <li>{@code d.d.d.d}</li>
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* <li>{@code d.d.d}</li>
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* <li>{@code d.d}</li>
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* <li>{@code d}</li>
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* </ul></blockquote>
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*
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* <p> When four parts are specified, each is interpreted as a byte of
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* data and assigned, from left to right, to the four bytes of an IPv4
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* address.
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*
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* <p> When a three part address is specified, the last part is
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* interpreted as a 16-bit quantity and placed in the right most two
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* bytes of the network address. This makes the three part address
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* format convenient for specifying Class B network addresses as
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* 128.net.host.
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*
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* <p> When a two part address is supplied, the last part is
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* interpreted as a 24-bit quantity and placed in the right most three
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* bytes of the network address. This makes the two part address
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* format convenient for specifying Class A network addresses as
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* net.host.
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*
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* <p> When only one part is given, the value is stored directly in
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* the network address without any byte rearrangement.
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*
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* <p> For example, the following (decimal) forms are supported by the methods
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* {@link Inet4Address#ofLiteral(String)} and {@link InetAddress#getByName(String)}
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* which are capable of parsing textual representations of IPv4 addresses:
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* {@snippet :
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* // Dotted-decimal 'd.d.d.d' form with four part address literal
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* InetAddress.getByName("007.008.009.010"); // ==> /7.8.9.10
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* InetAddress.getByName("127.0.1.1"); // ==> /127.0.1.1
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*
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* // Dotted-decimal 'd.d.d' form with three part address literal,
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* // the last part is placed in the right most two bytes
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* // of the constructed address
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* InetAddress.getByName("127.0.257"); // ==> /127.0.1.1
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*
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* // Dotted-decimal 'd.d' form with two part address literal,
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* // the last part is placed in the right most three bytes
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* // of the constructed address
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* Inet4Address.ofLiteral("127.257"); // ==> /127.0.1.1
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*
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* // 'd' form with one decimal value that is stored directly in
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* // the constructed address bytes without any rearrangement
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* Inet4Address.ofLiteral("02130706689"); // ==> /127.0.1.1
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* }
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*
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* <p> The above forms adhere to "strict" decimal-only syntax.
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* Additionally, the {@link Inet4Address#ofPosixLiteral(String)}
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* method implements a POSIX {@code inet_addr} compatible "loose"
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* parsing algorithm, allowing octal and hexadecimal address segments.
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* Please refer to <a href="https://www.ietf.org/rfc/rfc6943.html#section-3.1.1">
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* <i>RFC 6943: Issues in Identifier Comparison for Security
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* Purposes</i></a>. Aside from {@code Inet4Address.ofPosixLiteral(String)}, all methods only
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* support strict decimal parsing.
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* <p> For methods that return a textual representation as output
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* value, the first form, i.e. a dotted-quad string in strict decimal notation, is used.
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*
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* <h3> The Scope of a Multicast Address </h3>
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*
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* Historically the IPv4 TTL field in the IP header has doubled as a
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* multicast scope field: a TTL of 0 means node-local, 1 means
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* link-local, up through 32 means site-local, up through 64 means
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* region-local, up through 128 means continent-local, and up through
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* 255 are global. However, the administrative scoping is preferred.
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* Please refer to <a href="http://www.ietf.org/rfc/rfc2365.txt">
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* <i>RFC 2365: Administratively Scoped IP Multicast</i></a>
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*
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* @spec https://www.rfc-editor.org/info/rfc1918
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* RFC 1918: Address Allocation for Private Internets
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* @spec https://www.rfc-editor.org/info/rfc2365
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* RFC 2365: Administratively Scoped IP Multicast
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* @spec https://www.rfc-editor.org/info/rfc790
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* RFC 790: Assigned numbers
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* @spec https://www.rfc-editor.org/rfc/rfc6943.html#section-3.1.1
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* RFC 6943: Issues in Identifier Comparison for Security Purposes
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* @since 1.4
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*/
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public final
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class Inet4Address extends InetAddress {
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static final int INADDRSZ = 4;
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/** use serialVersionUID from InetAddress, but Inet4Address instance
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* is always replaced by an InetAddress instance before being
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* serialized */
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@java.io.Serial
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private static final long serialVersionUID = 3286316764910316507L;
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/*
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* Perform initializations.
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*/
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static {
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init();
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}
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Inet4Address() {
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super();
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holder().hostName = null;
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holder().address = 0;
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holder().family = IPv4;
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}
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Inet4Address(String hostName, byte[] addr) {
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holder().hostName = hostName;
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holder().family = IPv4;
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if (addr != null) {
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if (addr.length == INADDRSZ) {
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int address = addr[3] & 0xFF;
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address |= ((addr[2] << 8) & 0xFF00);
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address |= ((addr[1] << 16) & 0xFF0000);
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address |= ((addr[0] << 24) & 0xFF000000);
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holder().address = address;
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}
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}
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holder().originalHostName = hostName;
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}
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Inet4Address(String hostName, int address) {
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holder().hostName = hostName;
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holder().family = IPv4;
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holder().address = address;
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holder().originalHostName = hostName;
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}
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/**
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* Creates an {@code Inet4Address} based on the provided {@linkplain
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* Inet4Address##format textual representation} of an IPv4 address.
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* <p> If the provided IPv4 address literal cannot represent a {@linkplain
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* Inet4Address##format valid IPv4 address} an {@code IllegalArgumentException} is thrown.
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* <p> This method doesn't block, i.e. no reverse lookup is performed.
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*
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* @param ipv4AddressLiteral the textual representation of an IPv4 address.
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* @return an {@link Inet4Address} object with no hostname set, and constructed
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* from the provided IPv4 address literal.
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* @throws IllegalArgumentException if the {@code ipv4AddressLiteral} cannot be
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* parsed as an IPv4 address literal.
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* @throws NullPointerException if the {@code ipv4AddressLiteral} is {@code null}.
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* @since 22
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*/
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public static Inet4Address ofLiteral(String ipv4AddressLiteral) {
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Objects.requireNonNull(ipv4AddressLiteral);
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return parseAddressString(ipv4AddressLiteral, true);
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}
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/**
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* Creates an {@code Inet4Address} based on the provided {@linkplain
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* Inet4Address##format-posix textual representation of an IPv4 address in
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* POSIX {@code inet_addr} compatible form}.
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* <p> <a id="format-posix"></a> The method {@code ofPosixLiteral}
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* implements <a href="https://pubs.opengroup.org/onlinepubs/9699919799/functions/inet_addr.html">
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* POSIX {@code inet_addr}</a> compatible parsing algorithm, allowing
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* octal and hexadecimal address segments. {@code "0"} is the prefix
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* for octal numbers, {@code "0x"} and {@code "0X"} are the prefixes
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* for hexadecimal numbers. Non-zero address segments that start from
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* non-zero digits are parsed as decimal numbers. The following
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* (non-decimal) forms are supported by this method:
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* {@snippet :
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* // Dotted-quad 'x.x.x.x' form with four part address literal
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* Inet4Address.ofPosixLiteral("0177.0.0.1"); // ==> /127.0.0.1
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* Inet4Address.ofPosixLiteral("0x7F.0.0.1"); // ==> /127.0.0.1
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*
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* // Dotted-triple 'x.x.x' form with three part address literal,
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* // the last part is placed in the rightmost two bytes
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* // of the constructed address
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* Inet4Address.ofPosixLiteral("0177.0.0402"); // ==> /127.0.1.2
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* Inet4Address.ofPosixLiteral("0x7F.0.0x102"); // ==> /127.0.1.2
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*
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* // Dotted-double 'x.x' form with two part address literal,
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* // the last part is placed in the rightmost three bytes
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* // of the constructed address
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* Inet4Address.ofPosixLiteral("0177.0201003"); // ==> /127.1.2.3
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* Inet4Address.ofPosixLiteral("0x7F.0x10203"); // ==> /127.1.2.3
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* Inet4Address.ofPosixLiteral("127.66051"); // ==> /127.1.2.3
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*
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* // Dotless 'x' form with one value that is stored directly in
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* // the constructed address bytes without any rearrangement
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* Inet4Address.ofPosixLiteral("0100401404"); // ==> /1.2.3.4
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* Inet4Address.ofPosixLiteral("0x1020304"); // ==> /1.2.3.4
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* Inet4Address.ofPosixLiteral("16909060"); // ==> /1.2.3.4
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* }
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* <p> If the provided IPv4 address literal cannot represent a
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* valid IPv4 address in {@linkplain Inet4Address##format-posix
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* POSIX form} an {@code IllegalArgumentException} is thrown.
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* <p> This method doesn't block, i.e. no hostname lookup is performed.
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*
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* @apiNote
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* This method produces different results compared to {@linkplain Inet4Address#ofLiteral}
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* when {@code posixIPAddressLiteral} parameter contains address segments with
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* leading zeroes. An address segment with a leading zero is always parsed as an octal
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* number by this method, therefore {@code 0255} (octal) will be parsed as
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* {@code 173} (decimal). On the other hand, {@link Inet4Address#ofLiteral
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* Inet4Address.ofLiteral} ignores leading zeros, parses all numbers as decimal and produces
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* {@code 255}. Where this method would parse {@code 0256.0256.0256.0256} (octal) and
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* produce {@code 174.174.174.174} (decimal) in four dotted quad notation,
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* {@link Inet4Address#ofLiteral Inet4Address.ofLiteral} will throw
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* {@code IllegalArgumentException}.
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*
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* @param posixIPAddressLiteral a textual representation of an IPv4 address.
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* @return an {@link Inet4Address} object with no hostname set, and constructed
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* from the provided IPv4 address literal.
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* @throws IllegalArgumentException if the {@code posixIPAddressLiteral} cannot be
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* parsed as an IPv4 address literal.
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* @throws NullPointerException if the {@code posixIPAddressLiteral} is {@code null}.
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* @since 23
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*/
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public static Inet4Address ofPosixLiteral(String posixIPAddressLiteral) {
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Objects.requireNonNull(posixIPAddressLiteral);
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return parseAddressStringPosix(posixIPAddressLiteral);
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}
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/**
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* Parses the given string as an IPv4 address literal.
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* If the given {@code addressLiteral} string cannot be parsed as an IPv4 address literal
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* and {@code throwIAE} is {@code false}, {@code null} is returned.
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* If the given {@code addressLiteral} string cannot be parsed as an IPv4 address literal
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* and {@code throwIAE} is {@code true}, an {@code IllegalArgumentException} is thrown.
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* Otherwise, if it can be considered as {@linkplain IPAddressUtil#validateNumericFormatV4(String,
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* boolean) an ambiguous literal} - {@code IllegalArgumentException} is thrown irrelevant to
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* {@code throwIAE} value.
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*
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* @apiNote
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* The given {@code addressLiteral} string is considered ambiguous if it cannot be parsed as
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* a valid IPv4 address literal using decimal notation, but could be
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* interpreted as an IPv4 address in some other representation (octal, hexadecimal, or mixed).
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* @param addressLiteral IPv4 address literal to parse
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* @param throwIAE whether to throw {@code IllegalArgumentException} if the
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* given {@code addressLiteral} string cannot be parsed as
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* an IPv4 address literal.
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* @return {@code Inet4Address} object constructed from the address literal;
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* or {@code null} if the literal cannot be parsed as an IPv4 address
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* @throws IllegalArgumentException if the given {@code addressLiteral} string
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* cannot be parsed as an IPv4 address literal and {@code throwIAE} is {@code true},
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* or if it is considered ambiguous, regardless of the value of {@code throwIAE}.
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*/
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static Inet4Address parseAddressString(String addressLiteral, boolean throwIAE) {
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byte [] addrBytes= IPAddressUtil.validateNumericFormatV4(addressLiteral, throwIAE);
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if (addrBytes == null) {
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return null;
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}
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return new Inet4Address(null, addrBytes);
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}
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/**
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* Parses the given string as an IPv4 address literal in
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* {@linkplain Inet4Address##format-posix POSIX form.}
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*
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* <p> If the given {@code addressLiteral} string cannot be parsed as an IPv4 address literal
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* in POSIX form and {@code throwIAE} is {@code false}, {@code null} is returned.
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* If the given {@code addressLiteral} string cannot be parsed as an IPv4 address literal
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* and {@code throwIAE} is {@code true}, an {@code IllegalArgumentException}
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* is thrown.
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*
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* @apiNote
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* This method produces different results compared to {@linkplain Inet4Address#parseAddressString}
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* when {@code addressLiteral} parameter contains address segments with leading
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* zeroes. An address segment with a leading zero is always parsed as an octal
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* number by this method, therefore {@code 0255} (octal) will be parsed as
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* {@code 173} (decimal). On the other hand, {@link Inet4Address#parseAddressString}
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* ignores leading zeros, parses all numbers as decimal and produces {@code 255}.
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* Where this method would parse {@code 0256.0256.0256.0256} (octal) and produce
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* {@code 174.174.174.174} (decimal) in four dotted quad notation, {@linkplain
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* Inet4Address#parseAddressString} will either throw {@code IllegalArgumentException}
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* or return {@code null}, depending on the value of {@code throwIAE}.
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*
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* @param addressLiteral IPv4 address literal to parse
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* @param throwIAE whether to throw {@code IllegalArgumentException} if the
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* given {@code addressLiteral} string cannot be parsed as
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* an IPv4 address literal.
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* @return {@code Inet4Address} object constructed from the address literal;
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* or {@code null} if the literal cannot be parsed as an IPv4 address
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* @throws IllegalArgumentException if the given {@code addressLiteral} string
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* cannot be parsed as an IPv4 address literal and {@code throwIAE} is {@code true}.
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*/
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private static Inet4Address parseAddressStringPosix(String addressLiteral) {
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byte [] parsedBytes = IPAddressUtil.parseBsdLiteralV4(addressLiteral);
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if (parsedBytes == null) {
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throw IPAddressUtil.invalidIpAddressLiteral(addressLiteral);
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}
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return new Inet4Address(null, parsedBytes);
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}
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/**
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* Replaces the object to be serialized with an InetAddress object.
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*
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* @return the alternate object to be serialized.
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*
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* @throws ObjectStreamException if a new object replacing this
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* object could not be created
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*/
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@java.io.Serial
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private Object writeReplace() throws ObjectStreamException {
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// will replace the to be serialized 'this' object
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InetAddress inet = new InetAddress();
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inet.holder().hostName = holder().getHostName();
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inet.holder().address = holder().getAddress();
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/**
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* Prior to 1.4 an InetAddress was created with a family
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* based on the platform AF_INET value (usually 2).
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* For compatibility reasons we must therefore write
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* the InetAddress with this family.
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*/
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inet.holder().family = 2;
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return inet;
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}
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/**
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* Utility routine to check if the InetAddress is an
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* IP multicast address. IP multicast address is a Class D
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* address i.e first four bits of the address are 1110.
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* @return a {@code boolean} indicating if the InetAddress is
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* an IP multicast address
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*/
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public boolean isMulticastAddress() {
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return ((holder().getAddress() & 0xf0000000) == 0xe0000000);
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}
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/**
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* Utility routine to check if the InetAddress is a wildcard address.
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* @return a {@code boolean} indicating if the InetAddress is
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* a wildcard address.
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*/
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public boolean isAnyLocalAddress() {
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return holder().getAddress() == 0;
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}
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/**
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* Utility routine to check if the InetAddress is a loopback address.
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*
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* @return a {@code boolean} indicating if the InetAddress is
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* a loopback address; or false otherwise.
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*/
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public boolean isLoopbackAddress() {
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/* 127.x.x.x */
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byte[] byteAddr = getAddress();
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return byteAddr[0] == 127;
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}
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/**
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* Utility routine to check if the InetAddress is a link local address.
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*
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* @return a {@code boolean} indicating if the InetAddress is
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* a link local address; or false if address is not a link local unicast address.
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*/
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public boolean isLinkLocalAddress() {
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// link-local unicast in IPv4 (169.254.0.0/16)
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// defined in "Documenting Special Use IPv4 Address Blocks
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// that have been Registered with IANA" by Bill Manning
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// draft-manning-dsua-06.txt
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int address = holder().getAddress();
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return (((address >>> 24) & 0xFF) == 169)
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&& (((address >>> 16) & 0xFF) == 254);
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}
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/**
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* Utility routine to check if the InetAddress is a site local address.
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*
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* @return a {@code boolean} indicating if the InetAddress is
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* a site local address; or false if address is not a site local unicast address.
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*/
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public boolean isSiteLocalAddress() {
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// refer to RFC 1918
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// 10/8 prefix
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// 172.16/12 prefix
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// 192.168/16 prefix
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int address = holder().getAddress();
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return (((address >>> 24) & 0xFF) == 10)
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|| ((((address >>> 24) & 0xFF) == 172)
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&& (((address >>> 16) & 0xF0) == 16))
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|| ((((address >>> 24) & 0xFF) == 192)
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&& (((address >>> 16) & 0xFF) == 168));
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}
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/**
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* 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 32-bit IPv4 address.
|
|
*/
|
|
int addressValue() {
|
|
return holder().getAddress();
|
|
}
|
|
|
|
/**
|
|
* 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 instanceof Inet4Address inet4Address) &&
|
|
inet4Address.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
|
|
* textual representation format
|
|
*/
|
|
static String numericToTextFormat(byte[] src)
|
|
{
|
|
return (src[0] & 0xff) + "." + (src[1] & 0xff) + "." + (src[2] & 0xff) + "." + (src[3] & 0xff);
|
|
}
|
|
|
|
/**
|
|
* Perform class load-time initializations.
|
|
*/
|
|
private static native void init();
|
|
}
|