1126 lines
42 KiB
Java
1126 lines
42 KiB
Java
/*
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* Copyright (C) 2008 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
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* in compliance with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.google.common.net;
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import static com.google.common.base.Preconditions.checkArgument;
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import static com.google.common.base.Preconditions.checkNotNull;
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import com.google.common.annotations.Beta;
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import com.google.common.annotations.GwtIncompatible;
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import com.google.common.base.CharMatcher;
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import com.google.common.base.MoreObjects;
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import com.google.common.base.Splitter;
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import com.google.common.hash.Hashing;
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import com.google.common.io.ByteStreams;
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import com.google.common.primitives.Ints;
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import java.math.BigInteger;
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import java.net.Inet4Address;
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import java.net.Inet6Address;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import java.nio.ByteBuffer;
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import java.util.Arrays;
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import java.util.Locale;
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/**
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* Static utility methods pertaining to {@link InetAddress} instances.
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*
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* <p><b>Important note:</b> Unlike {@code InetAddress.getByName()}, the methods of this class never
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* cause DNS services to be accessed. For this reason, you should prefer these methods as much as
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* possible over their JDK equivalents whenever you are expecting to handle only IP address string
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* literals -- there is no blocking DNS penalty for a malformed string.
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*
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* <p>When dealing with {@link Inet4Address} and {@link Inet6Address} objects as byte arrays (vis.
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* {@code InetAddress.getAddress()}) they are 4 and 16 bytes in length, respectively, and represent
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* the address in network byte order.
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*
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* <p>Examples of IP addresses and their byte representations:
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*
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* <dl>
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* <dt>The IPv4 loopback address, {@code "127.0.0.1"}.
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* <dd>{@code 7f 00 00 01}
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* <dt>The IPv6 loopback address, {@code "::1"}.
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* <dd>{@code 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01}
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* <dt>From the IPv6 reserved documentation prefix ({@code 2001:db8::/32}), {@code "2001:db8::1"}.
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* <dd>{@code 20 01 0d b8 00 00 00 00 00 00 00 00 00 00 00 01}
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* <dt>An IPv6 "IPv4 compatible" (or "compat") address, {@code "::192.168.0.1"}.
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* <dd>{@code 00 00 00 00 00 00 00 00 00 00 00 00 c0 a8 00 01}
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* <dt>An IPv6 "IPv4 mapped" address, {@code "::ffff:192.168.0.1"}.
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* <dd>{@code 00 00 00 00 00 00 00 00 00 00 ff ff c0 a8 00 01}
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* </dl>
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*
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* <p>A few notes about IPv6 "IPv4 mapped" addresses and their observed use in Java.
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*
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* <p>"IPv4 mapped" addresses were originally a representation of IPv4 addresses for use on an IPv6
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* socket that could receive both IPv4 and IPv6 connections (by disabling the {@code IPV6_V6ONLY}
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* socket option on an IPv6 socket). Yes, it's confusing. Nevertheless, these "mapped" addresses
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* were never supposed to be seen on the wire. That assumption was dropped, some say mistakenly, in
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* later RFCs with the apparent aim of making IPv4-to-IPv6 transition simpler.
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*
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* <p>Technically one <i>can</i> create a 128bit IPv6 address with the wire format of a "mapped"
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* address, as shown above, and transmit it in an IPv6 packet header. However, Java's InetAddress
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* creation methods appear to adhere doggedly to the original intent of the "mapped" address: all
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* "mapped" addresses return {@link Inet4Address} objects.
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*
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* <p>For added safety, it is common for IPv6 network operators to filter all packets where either
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* the source or destination address appears to be a "compat" or "mapped" address. Filtering
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* suggestions usually recommend discarding any packets with source or destination addresses in the
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* invalid range {@code ::/3}, which includes both of these bizarre address formats. For more
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* information on "bogons", including lists of IPv6 bogon space, see:
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*
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* <ul>
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* <li><a target="_parent"
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* href="http://en.wikipedia.org/wiki/Bogon_filtering">http://en.wikipedia.
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* org/wiki/Bogon_filtering</a>
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* <li><a target="_parent"
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* href="http://www.cymru.com/Bogons/ipv6.txt">http://www.cymru.com/Bogons/ ipv6.txt</a>
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* <li><a target="_parent" href="http://www.cymru.com/Bogons/v6bogon.html">http://www.cymru.com/
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* Bogons/v6bogon.html</a>
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* <li><a target="_parent" href="http://www.space.net/~gert/RIPE/ipv6-filters.html">http://www.
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* space.net/~gert/RIPE/ipv6-filters.html</a>
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* </ul>
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*
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* @author Erik Kline
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* @since 5.0
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*/
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@Beta
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@GwtIncompatible
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public final class InetAddresses {
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private static final int IPV4_PART_COUNT = 4;
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private static final int IPV6_PART_COUNT = 8;
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private static final Splitter IPV4_SPLITTER = Splitter.on('.').limit(IPV4_PART_COUNT);
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private static final Splitter IPV6_SPLITTER = Splitter.on(':').limit(IPV6_PART_COUNT + 2);
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private static final char IPV4_DELIMITER = '.';
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private static final char IPV6_DELIMITER = ':';
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private static final CharMatcher IPV4_DELIMITER_MATCHER = CharMatcher.is(IPV4_DELIMITER);
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private static final CharMatcher IPV6_DELIMITER_MATCHER = CharMatcher.is(IPV6_DELIMITER);
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private static final Inet4Address LOOPBACK4 = (Inet4Address) forString("127.0.0.1");
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private static final Inet4Address ANY4 = (Inet4Address) forString("0.0.0.0");
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private InetAddresses() {}
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/**
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* Returns an {@link Inet4Address}, given a byte array representation of the IPv4 address.
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*
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* @param bytes byte array representing an IPv4 address (should be of length 4)
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* @return {@link Inet4Address} corresponding to the supplied byte array
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* @throws IllegalArgumentException if a valid {@link Inet4Address} can not be created
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*/
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private static Inet4Address getInet4Address(byte[] bytes) {
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checkArgument(
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bytes.length == 4,
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"Byte array has invalid length for an IPv4 address: %s != 4.",
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bytes.length);
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// Given a 4-byte array, this cast should always succeed.
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return (Inet4Address) bytesToInetAddress(bytes);
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}
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/**
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* Returns the {@link InetAddress} having the given string representation.
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*
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* <p>This deliberately avoids all nameservice lookups (e.g. no DNS).
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*
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* <p>Anything after a {@code %} in an IPv6 address is ignored (assumed to be a Scope ID).
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*
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* @param ipString {@code String} containing an IPv4 or IPv6 string literal, e.g. {@code
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* "192.168.0.1"} or {@code "2001:db8::1"}
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* @return {@link InetAddress} representing the argument
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* @throws IllegalArgumentException if the argument is not a valid IP string literal
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*/
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public static InetAddress forString(String ipString) {
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byte[] addr = ipStringToBytes(ipString);
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// The argument was malformed, i.e. not an IP string literal.
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if (addr == null) {
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throw formatIllegalArgumentException("'%s' is not an IP string literal.", ipString);
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}
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return bytesToInetAddress(addr);
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}
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/**
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* Returns {@code true} if the supplied string is a valid IP string literal, {@code false}
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* otherwise.
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*
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* @param ipString {@code String} to evaluated as an IP string literal
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* @return {@code true} if the argument is a valid IP string literal
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*/
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public static boolean isInetAddress(String ipString) {
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return ipStringToBytes(ipString) != null;
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}
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/** Returns {@code null} if unable to parse into a {@code byte[]}. */
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private static byte [] ipStringToBytes(String ipString) {
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// Make a first pass to categorize the characters in this string.
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boolean hasColon = false;
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boolean hasDot = false;
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int percentIndex = -1;
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for (int i = 0; i < ipString.length(); i++) {
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char c = ipString.charAt(i);
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if (c == '.') {
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hasDot = true;
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} else if (c == ':') {
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if (hasDot) {
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return null; // Colons must not appear after dots.
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}
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hasColon = true;
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} else if (c == '%') {
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percentIndex = i;
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break; // everything after a '%' is ignored (it's a Scope ID): http://superuser.com/a/99753
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} else if (Character.digit(c, 16) == -1) {
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return null; // Everything else must be a decimal or hex digit.
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}
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}
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// Now decide which address family to parse.
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if (hasColon) {
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if (hasDot) {
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ipString = convertDottedQuadToHex(ipString);
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if (ipString == null) {
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return null;
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}
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}
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if (percentIndex != -1) {
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ipString = ipString.substring(0, percentIndex);
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}
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return textToNumericFormatV6(ipString);
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} else if (hasDot) {
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if (percentIndex != -1) {
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return null; // Scope IDs are not supported for IPV4
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}
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return textToNumericFormatV4(ipString);
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}
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return null;
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}
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private static byte [] textToNumericFormatV4(String ipString) {
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if (IPV4_DELIMITER_MATCHER.countIn(ipString) + 1 != IPV4_PART_COUNT) {
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return null; // Wrong number of parts
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}
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byte[] bytes = new byte[IPV4_PART_COUNT];
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int start = 0;
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// Iterate through the parts of the ip string.
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// Invariant: start is always the beginning of an octet.
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for (int i = 0; i < IPV4_PART_COUNT; i++) {
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int end = ipString.indexOf(IPV4_DELIMITER, start);
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if (end == -1) {
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end = ipString.length();
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}
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try {
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bytes[i] = parseOctet(ipString, start, end);
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} catch (NumberFormatException ex) {
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return null;
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}
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start = end + 1;
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}
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return bytes;
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}
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private static byte[] textToNumericFormatV6(String ipString) {
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// An address can have [2..8] colons.
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int delimiterCount = IPV6_DELIMITER_MATCHER.countIn(ipString);
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if (delimiterCount < 2 || delimiterCount > IPV6_PART_COUNT) {
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return null;
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}
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int partsSkipped = IPV6_PART_COUNT - (delimiterCount + 1); // estimate; may be modified later
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boolean hasSkip = false;
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// Scan for the appearance of ::, to mark a skip-format IPV6 string and adjust the partsSkipped
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// estimate.
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for (int i = 0; i < ipString.length() - 1; i++) {
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if (ipString.charAt(i) == IPV6_DELIMITER && ipString.charAt(i + 1) == IPV6_DELIMITER) {
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if (hasSkip) {
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return null; // Can't have more than one ::
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}
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hasSkip = true;
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partsSkipped++; // :: means we skipped an extra part in between the two delimiters.
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if (i == 0) {
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partsSkipped++; // Begins with ::, so we skipped the part preceding the first :
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}
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if (i == ipString.length() - 2) {
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partsSkipped++; // Ends with ::, so we skipped the part after the last :
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}
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}
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}
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if (ipString.charAt(0) == IPV6_DELIMITER && ipString.charAt(1) != IPV6_DELIMITER) {
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return null; // ^: requires ^::
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}
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if (ipString.charAt(ipString.length() - 1) == IPV6_DELIMITER
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&& ipString.charAt(ipString.length() - 2) != IPV6_DELIMITER) {
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return null; // :$ requires ::$
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}
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if (hasSkip && partsSkipped <= 0) {
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return null; // :: must expand to at least one '0'
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}
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if (!hasSkip && delimiterCount + 1 != IPV6_PART_COUNT) {
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return null; // Incorrect number of parts
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}
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ByteBuffer rawBytes = ByteBuffer.allocate(2 * IPV6_PART_COUNT);
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try {
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// Iterate through the parts of the ip string.
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// Invariant: start is always the beginning of a hextet, or the second ':' of the skip
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// sequence "::"
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int start = 0;
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if (ipString.charAt(0) == IPV6_DELIMITER) {
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start = 1;
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}
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while (start < ipString.length()) {
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int end = ipString.indexOf(IPV6_DELIMITER, start);
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if (end == -1) {
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end = ipString.length();
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}
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if (ipString.charAt(start) == IPV6_DELIMITER) {
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// expand zeroes
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for (int i = 0; i < partsSkipped; i++) {
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rawBytes.putShort((short) 0);
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}
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} else {
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rawBytes.putShort(parseHextet(ipString, start, end));
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}
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start = end + 1;
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}
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} catch (NumberFormatException ex) {
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return null;
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}
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return rawBytes.array();
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}
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private static String convertDottedQuadToHex(String ipString) {
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int lastColon = ipString.lastIndexOf(':');
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String initialPart = ipString.substring(0, lastColon + 1);
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String dottedQuad = ipString.substring(lastColon + 1);
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byte[] quad = textToNumericFormatV4(dottedQuad);
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if (quad == null) {
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return null;
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}
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String penultimate = Integer.toHexString(((quad[0] & 0xff) << 8) | (quad[1] & 0xff));
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String ultimate = Integer.toHexString(((quad[2] & 0xff) << 8) | (quad[3] & 0xff));
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return initialPart + penultimate + ":" + ultimate;
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}
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private static byte parseOctet(String ipString, int start, int end) {
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// Note: we already verified that this string contains only hex digits, but the string may still
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// contain non-decimal characters.
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int length = end - start;
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if (length <= 0 || length > 3) {
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throw new NumberFormatException();
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}
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// Disallow leading zeroes, because no clear standard exists on
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// whether these should be interpreted as decimal or octal.
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if (length > 1 && ipString.charAt(start) == '0') {
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throw new NumberFormatException();
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}
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int octet = 0;
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for (int i = start; i < end; i++) {
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octet *= 10;
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int digit = Character.digit(ipString.charAt(i), 10);
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if (digit < 0) {
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throw new NumberFormatException();
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}
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octet += digit;
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}
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if (octet > 255) {
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throw new NumberFormatException();
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}
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return (byte) octet;
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}
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// Parse a hextet out of the ipString from start (inclusive) to end (exclusive)
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private static short parseHextet(String ipString, int start, int end) {
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// Note: we already verified that this string contains only hex digits.
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int length = end - start;
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if (length <= 0 || length > 4) {
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throw new NumberFormatException();
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}
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int hextet = 0;
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for (int i = start; i < end; i++) {
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hextet = hextet << 4;
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hextet |= Character.digit(ipString.charAt(i), 16);
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}
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return (short) hextet;
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}
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/**
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* Convert a byte array into an InetAddress.
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*
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* <p>{@link InetAddress#getByAddress} is documented as throwing a checked exception "if IP
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* address is of illegal length." We replace it with an unchecked exception, for use by callers
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* who already know that addr is an array of length 4 or 16.
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*
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* @param addr the raw 4-byte or 16-byte IP address in big-endian order
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* @return an InetAddress object created from the raw IP address
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*/
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private static InetAddress bytesToInetAddress(byte[] addr) {
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try {
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return InetAddress.getByAddress(addr);
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} catch (UnknownHostException e) {
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throw new AssertionError(e);
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}
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}
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/**
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* Returns the string representation of an {@link InetAddress}.
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*
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* <p>For IPv4 addresses, this is identical to {@link InetAddress#getHostAddress()}, but for IPv6
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* addresses, the output follows <a href="http://tools.ietf.org/html/rfc5952">RFC 5952</a> section
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* 4. The main difference is that this method uses "::" for zero compression, while Java's version
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* uses the uncompressed form.
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*
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* <p>This method uses hexadecimal for all IPv6 addresses, including IPv4-mapped IPv6 addresses
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* such as "::c000:201". The output does not include a Scope ID.
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*
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* @param ip {@link InetAddress} to be converted to an address string
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* @return {@code String} containing the text-formatted IP address
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* @since 10.0
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*/
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public static String toAddrString(InetAddress ip) {
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checkNotNull(ip);
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if (ip instanceof Inet4Address) {
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// For IPv4, Java's formatting is good enough.
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return ip.getHostAddress();
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}
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checkArgument(ip instanceof Inet6Address);
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byte[] bytes = ip.getAddress();
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int[] hextets = new int[IPV6_PART_COUNT];
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for (int i = 0; i < hextets.length; i++) {
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hextets[i] = Ints.fromBytes((byte) 0, (byte) 0, bytes[2 * i], bytes[2 * i + 1]);
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}
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compressLongestRunOfZeroes(hextets);
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return hextetsToIPv6String(hextets);
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}
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/**
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* Identify and mark the longest run of zeroes in an IPv6 address.
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*
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* <p>Only runs of two or more hextets are considered. In case of a tie, the leftmost run wins. If
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* a qualifying run is found, its hextets are replaced by the sentinel value -1.
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*
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* @param hextets {@code int[]} mutable array of eight 16-bit hextets
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*/
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private static void compressLongestRunOfZeroes(int[] hextets) {
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int bestRunStart = -1;
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int bestRunLength = -1;
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int runStart = -1;
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for (int i = 0; i < hextets.length + 1; i++) {
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if (i < hextets.length && hextets[i] == 0) {
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if (runStart < 0) {
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runStart = i;
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}
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} else if (runStart >= 0) {
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int runLength = i - runStart;
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if (runLength > bestRunLength) {
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bestRunStart = runStart;
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bestRunLength = runLength;
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}
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runStart = -1;
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}
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}
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if (bestRunLength >= 2) {
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Arrays.fill(hextets, bestRunStart, bestRunStart + bestRunLength, -1);
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}
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}
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/**
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* Convert a list of hextets into a human-readable IPv6 address.
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*
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* <p>In order for "::" compression to work, the input should contain negative sentinel values in
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* place of the elided zeroes.
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*
|
|
* @param hextets {@code int[]} array of eight 16-bit hextets, or -1s
|
|
*/
|
|
private static String hextetsToIPv6String(int[] hextets) {
|
|
// While scanning the array, handle these state transitions:
|
|
// start->num => "num" start->gap => "::"
|
|
// num->num => ":num" num->gap => "::"
|
|
// gap->num => "num" gap->gap => ""
|
|
StringBuilder buf = new StringBuilder(39);
|
|
boolean lastWasNumber = false;
|
|
for (int i = 0; i < hextets.length; i++) {
|
|
boolean thisIsNumber = hextets[i] >= 0;
|
|
if (thisIsNumber) {
|
|
if (lastWasNumber) {
|
|
buf.append(':');
|
|
}
|
|
buf.append(Integer.toHexString(hextets[i]));
|
|
} else {
|
|
if (i == 0 || lastWasNumber) {
|
|
buf.append("::");
|
|
}
|
|
}
|
|
lastWasNumber = thisIsNumber;
|
|
}
|
|
return buf.toString();
|
|
}
|
|
|
|
/**
|
|
* Returns the string representation of an {@link InetAddress} suitable for inclusion in a URI.
|
|
*
|
|
* <p>For IPv4 addresses, this is identical to {@link InetAddress#getHostAddress()}, but for IPv6
|
|
* addresses it compresses zeroes and surrounds the text with square brackets; for example {@code
|
|
* "[2001:db8::1]"}.
|
|
*
|
|
* <p>Per section 3.2.2 of <a target="_parent"
|
|
* href="http://tools.ietf.org/html/rfc3986#section-3.2.2">RFC 3986</a>, a URI containing an IPv6
|
|
* string literal is of the form {@code "http://[2001:db8::1]:8888/index.html"}.
|
|
*
|
|
* <p>Use of either {@link InetAddresses#toAddrString}, {@link InetAddress#getHostAddress()}, or
|
|
* this method is recommended over {@link InetAddress#toString()} when an IP address string
|
|
* literal is desired. This is because {@link InetAddress#toString()} prints the hostname and the
|
|
* IP address string joined by a "/".
|
|
*
|
|
* @param ip {@link InetAddress} to be converted to URI string literal
|
|
* @return {@code String} containing URI-safe string literal
|
|
*/
|
|
public static String toUriString(InetAddress ip) {
|
|
if (ip instanceof Inet6Address) {
|
|
return "[" + toAddrString(ip) + "]";
|
|
}
|
|
return toAddrString(ip);
|
|
}
|
|
|
|
/**
|
|
* Returns an InetAddress representing the literal IPv4 or IPv6 host portion of a URL, encoded in
|
|
* the format specified by RFC 3986 section 3.2.2.
|
|
*
|
|
* <p>This function is similar to {@link InetAddresses#forString(String)}, however, it requires
|
|
* that IPv6 addresses are surrounded by square brackets.
|
|
*
|
|
* <p>This function is the inverse of {@link InetAddresses#toUriString(java.net.InetAddress)}.
|
|
*
|
|
* @param hostAddr A RFC 3986 section 3.2.2 encoded IPv4 or IPv6 address
|
|
* @return an InetAddress representing the address in {@code hostAddr}
|
|
* @throws IllegalArgumentException if {@code hostAddr} is not a valid IPv4 address, or IPv6
|
|
* address surrounded by square brackets
|
|
*/
|
|
public static InetAddress forUriString(String hostAddr) {
|
|
InetAddress addr = forUriStringNoThrow(hostAddr);
|
|
if (addr == null) {
|
|
throw formatIllegalArgumentException("Not a valid URI IP literal: '%s'", hostAddr);
|
|
}
|
|
|
|
return addr;
|
|
}
|
|
|
|
private static InetAddress forUriStringNoThrow(String hostAddr) {
|
|
checkNotNull(hostAddr);
|
|
|
|
// Decide if this should be an IPv6 or IPv4 address.
|
|
String ipString;
|
|
int expectBytes;
|
|
if (hostAddr.startsWith("[") && hostAddr.endsWith("]")) {
|
|
ipString = hostAddr.substring(1, hostAddr.length() - 1);
|
|
expectBytes = 16;
|
|
} else {
|
|
ipString = hostAddr;
|
|
expectBytes = 4;
|
|
}
|
|
|
|
// Parse the address, and make sure the length/version is correct.
|
|
byte[] addr = ipStringToBytes(ipString);
|
|
if (addr == null || addr.length != expectBytes) {
|
|
return null;
|
|
}
|
|
|
|
return bytesToInetAddress(addr);
|
|
}
|
|
|
|
/**
|
|
* Returns {@code true} if the supplied string is a valid URI IP string literal, {@code false}
|
|
* otherwise.
|
|
*
|
|
* @param ipString {@code String} to evaluated as an IP URI host string literal
|
|
* @return {@code true} if the argument is a valid IP URI host
|
|
*/
|
|
public static boolean isUriInetAddress(String ipString) {
|
|
return forUriStringNoThrow(ipString) != null;
|
|
}
|
|
|
|
/**
|
|
* Evaluates whether the argument is an IPv6 "compat" address.
|
|
*
|
|
* <p>An "IPv4 compatible", or "compat", address is one with 96 leading bits of zero, with the
|
|
* remaining 32 bits interpreted as an IPv4 address. These are conventionally represented in
|
|
* string literals as {@code "::192.168.0.1"}, though {@code "::c0a8:1"} is also considered an
|
|
* IPv4 compatible address (and equivalent to {@code "::192.168.0.1"}).
|
|
*
|
|
* <p>For more on IPv4 compatible addresses see section 2.5.5.1 of <a target="_parent"
|
|
* href="http://tools.ietf.org/html/rfc4291#section-2.5.5.1">RFC 4291</a>.
|
|
*
|
|
* <p>NOTE: This method is different from {@link Inet6Address#isIPv4CompatibleAddress} in that it
|
|
* more correctly classifies {@code "::"} and {@code "::1"} as proper IPv6 addresses (which they
|
|
* are), NOT IPv4 compatible addresses (which they are generally NOT considered to be).
|
|
*
|
|
* @param ip {@link Inet6Address} to be examined for embedded IPv4 compatible address format
|
|
* @return {@code true} if the argument is a valid "compat" address
|
|
*/
|
|
public static boolean isCompatIPv4Address(Inet6Address ip) {
|
|
if (!ip.isIPv4CompatibleAddress()) {
|
|
return false;
|
|
}
|
|
|
|
byte[] bytes = ip.getAddress();
|
|
if ((bytes[12] == 0)
|
|
&& (bytes[13] == 0)
|
|
&& (bytes[14] == 0)
|
|
&& ((bytes[15] == 0) || (bytes[15] == 1))) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Returns the IPv4 address embedded in an IPv4 compatible address.
|
|
*
|
|
* @param ip {@link Inet6Address} to be examined for an embedded IPv4 address
|
|
* @return {@link Inet4Address} of the embedded IPv4 address
|
|
* @throws IllegalArgumentException if the argument is not a valid IPv4 compatible address
|
|
*/
|
|
public static Inet4Address getCompatIPv4Address(Inet6Address ip) {
|
|
checkArgument(
|
|
isCompatIPv4Address(ip), "Address '%s' is not IPv4-compatible.", toAddrString(ip));
|
|
|
|
return getInet4Address(Arrays.copyOfRange(ip.getAddress(), 12, 16));
|
|
}
|
|
|
|
/**
|
|
* Evaluates whether the argument is a 6to4 address.
|
|
*
|
|
* <p>6to4 addresses begin with the {@code "2002::/16"} prefix. The next 32 bits are the IPv4
|
|
* address of the host to which IPv6-in-IPv4 tunneled packets should be routed.
|
|
*
|
|
* <p>For more on 6to4 addresses see section 2 of <a target="_parent"
|
|
* href="http://tools.ietf.org/html/rfc3056#section-2">RFC 3056</a>.
|
|
*
|
|
* @param ip {@link Inet6Address} to be examined for 6to4 address format
|
|
* @return {@code true} if the argument is a 6to4 address
|
|
*/
|
|
public static boolean is6to4Address(Inet6Address ip) {
|
|
byte[] bytes = ip.getAddress();
|
|
return (bytes[0] == (byte) 0x20) && (bytes[1] == (byte) 0x02);
|
|
}
|
|
|
|
/**
|
|
* Returns the IPv4 address embedded in a 6to4 address.
|
|
*
|
|
* @param ip {@link Inet6Address} to be examined for embedded IPv4 in 6to4 address
|
|
* @return {@link Inet4Address} of embedded IPv4 in 6to4 address
|
|
* @throws IllegalArgumentException if the argument is not a valid IPv6 6to4 address
|
|
*/
|
|
public static Inet4Address get6to4IPv4Address(Inet6Address ip) {
|
|
checkArgument(is6to4Address(ip), "Address '%s' is not a 6to4 address.", toAddrString(ip));
|
|
|
|
return getInet4Address(Arrays.copyOfRange(ip.getAddress(), 2, 6));
|
|
}
|
|
|
|
/**
|
|
* A simple immutable data class to encapsulate the information to be found in a Teredo address.
|
|
*
|
|
* <p>All of the fields in this class are encoded in various portions of the IPv6 address as part
|
|
* of the protocol. More protocols details can be found at: <a target="_parent"
|
|
* href="http://en.wikipedia.org/wiki/Teredo_tunneling">http://en.wikipedia.
|
|
* org/wiki/Teredo_tunneling</a>.
|
|
*
|
|
* <p>The RFC can be found here: <a target="_parent" href="http://tools.ietf.org/html/rfc4380">RFC
|
|
* 4380</a>.
|
|
*
|
|
* @since 5.0
|
|
*/
|
|
@Beta
|
|
public static final class TeredoInfo {
|
|
private final Inet4Address server;
|
|
private final Inet4Address client;
|
|
private final int port;
|
|
private final int flags;
|
|
|
|
/**
|
|
* Constructs a TeredoInfo instance.
|
|
*
|
|
* <p>Both server and client can be {@code null}, in which case the value {@code "0.0.0.0"} will
|
|
* be assumed.
|
|
*
|
|
* @throws IllegalArgumentException if either of the {@code port} or the {@code flags} arguments
|
|
* are out of range of an unsigned short
|
|
*/
|
|
// TODO: why is this public?
|
|
public TeredoInfo(
|
|
Inet4Address server, Inet4Address client, int port, int flags) {
|
|
checkArgument(
|
|
(port >= 0) && (port <= 0xffff), "port '%s' is out of range (0 <= port <= 0xffff)", port);
|
|
checkArgument(
|
|
(flags >= 0) && (flags <= 0xffff),
|
|
"flags '%s' is out of range (0 <= flags <= 0xffff)",
|
|
flags);
|
|
|
|
this.server = MoreObjects.firstNonNull(server, ANY4);
|
|
this.client = MoreObjects.firstNonNull(client, ANY4);
|
|
this.port = port;
|
|
this.flags = flags;
|
|
}
|
|
|
|
public Inet4Address getServer() {
|
|
return server;
|
|
}
|
|
|
|
public Inet4Address getClient() {
|
|
return client;
|
|
}
|
|
|
|
public int getPort() {
|
|
return port;
|
|
}
|
|
|
|
public int getFlags() {
|
|
return flags;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Evaluates whether the argument is a Teredo address.
|
|
*
|
|
* <p>Teredo addresses begin with the {@code "2001::/32"} prefix.
|
|
*
|
|
* @param ip {@link Inet6Address} to be examined for Teredo address format
|
|
* @return {@code true} if the argument is a Teredo address
|
|
*/
|
|
public static boolean isTeredoAddress(Inet6Address ip) {
|
|
byte[] bytes = ip.getAddress();
|
|
return (bytes[0] == (byte) 0x20)
|
|
&& (bytes[1] == (byte) 0x01)
|
|
&& (bytes[2] == 0)
|
|
&& (bytes[3] == 0);
|
|
}
|
|
|
|
/**
|
|
* Returns the Teredo information embedded in a Teredo address.
|
|
*
|
|
* @param ip {@link Inet6Address} to be examined for embedded Teredo information
|
|
* @return extracted {@code TeredoInfo}
|
|
* @throws IllegalArgumentException if the argument is not a valid IPv6 Teredo address
|
|
*/
|
|
public static TeredoInfo getTeredoInfo(Inet6Address ip) {
|
|
checkArgument(isTeredoAddress(ip), "Address '%s' is not a Teredo address.", toAddrString(ip));
|
|
|
|
byte[] bytes = ip.getAddress();
|
|
Inet4Address server = getInet4Address(Arrays.copyOfRange(bytes, 4, 8));
|
|
|
|
int flags = ByteStreams.newDataInput(bytes, 8).readShort() & 0xffff;
|
|
|
|
// Teredo obfuscates the mapped client port, per section 4 of the RFC.
|
|
int port = ~ByteStreams.newDataInput(bytes, 10).readShort() & 0xffff;
|
|
|
|
byte[] clientBytes = Arrays.copyOfRange(bytes, 12, 16);
|
|
for (int i = 0; i < clientBytes.length; i++) {
|
|
// Teredo obfuscates the mapped client IP, per section 4 of the RFC.
|
|
clientBytes[i] = (byte) ~clientBytes[i];
|
|
}
|
|
Inet4Address client = getInet4Address(clientBytes);
|
|
|
|
return new TeredoInfo(server, client, port, flags);
|
|
}
|
|
|
|
/**
|
|
* Evaluates whether the argument is an ISATAP address.
|
|
*
|
|
* <p>From RFC 5214: "ISATAP interface identifiers are constructed in Modified EUI-64 format [...]
|
|
* by concatenating the 24-bit IANA OUI (00-00-5E), the 8-bit hexadecimal value 0xFE, and a 32-bit
|
|
* IPv4 address in network byte order [...]"
|
|
*
|
|
* <p>For more on ISATAP addresses see section 6.1 of <a target="_parent"
|
|
* href="http://tools.ietf.org/html/rfc5214#section-6.1">RFC 5214</a>.
|
|
*
|
|
* @param ip {@link Inet6Address} to be examined for ISATAP address format
|
|
* @return {@code true} if the argument is an ISATAP address
|
|
*/
|
|
public static boolean isIsatapAddress(Inet6Address ip) {
|
|
|
|
// If it's a Teredo address with the right port (41217, or 0xa101)
|
|
// which would be encoded as 0x5efe then it can't be an ISATAP address.
|
|
if (isTeredoAddress(ip)) {
|
|
return false;
|
|
}
|
|
|
|
byte[] bytes = ip.getAddress();
|
|
|
|
if ((bytes[8] | (byte) 0x03) != (byte) 0x03) {
|
|
|
|
// Verify that high byte of the 64 bit identifier is zero, modulo
|
|
// the U/L and G bits, with which we are not concerned.
|
|
return false;
|
|
}
|
|
|
|
return (bytes[9] == (byte) 0x00) && (bytes[10] == (byte) 0x5e) && (bytes[11] == (byte) 0xfe);
|
|
}
|
|
|
|
/**
|
|
* Returns the IPv4 address embedded in an ISATAP address.
|
|
*
|
|
* @param ip {@link Inet6Address} to be examined for embedded IPv4 in ISATAP address
|
|
* @return {@link Inet4Address} of embedded IPv4 in an ISATAP address
|
|
* @throws IllegalArgumentException if the argument is not a valid IPv6 ISATAP address
|
|
*/
|
|
public static Inet4Address getIsatapIPv4Address(Inet6Address ip) {
|
|
checkArgument(isIsatapAddress(ip), "Address '%s' is not an ISATAP address.", toAddrString(ip));
|
|
|
|
return getInet4Address(Arrays.copyOfRange(ip.getAddress(), 12, 16));
|
|
}
|
|
|
|
/**
|
|
* Examines the Inet6Address to determine if it is an IPv6 address of one of the specified address
|
|
* types that contain an embedded IPv4 address.
|
|
*
|
|
* <p>NOTE: ISATAP addresses are explicitly excluded from this method due to their trivial
|
|
* spoofability. With other transition addresses spoofing involves (at least) infection of one's
|
|
* BGP routing table.
|
|
*
|
|
* @param ip {@link Inet6Address} to be examined for embedded IPv4 client address
|
|
* @return {@code true} if there is an embedded IPv4 client address
|
|
* @since 7.0
|
|
*/
|
|
public static boolean hasEmbeddedIPv4ClientAddress(Inet6Address ip) {
|
|
return isCompatIPv4Address(ip) || is6to4Address(ip) || isTeredoAddress(ip);
|
|
}
|
|
|
|
/**
|
|
* Examines the Inet6Address to extract the embedded IPv4 client address if the InetAddress is an
|
|
* IPv6 address of one of the specified address types that contain an embedded IPv4 address.
|
|
*
|
|
* <p>NOTE: ISATAP addresses are explicitly excluded from this method due to their trivial
|
|
* spoofability. With other transition addresses spoofing involves (at least) infection of one's
|
|
* BGP routing table.
|
|
*
|
|
* @param ip {@link Inet6Address} to be examined for embedded IPv4 client address
|
|
* @return {@link Inet4Address} of embedded IPv4 client address
|
|
* @throws IllegalArgumentException if the argument does not have a valid embedded IPv4 address
|
|
*/
|
|
public static Inet4Address getEmbeddedIPv4ClientAddress(Inet6Address ip) {
|
|
if (isCompatIPv4Address(ip)) {
|
|
return getCompatIPv4Address(ip);
|
|
}
|
|
|
|
if (is6to4Address(ip)) {
|
|
return get6to4IPv4Address(ip);
|
|
}
|
|
|
|
if (isTeredoAddress(ip)) {
|
|
return getTeredoInfo(ip).getClient();
|
|
}
|
|
|
|
throw formatIllegalArgumentException("'%s' has no embedded IPv4 address.", toAddrString(ip));
|
|
}
|
|
|
|
/**
|
|
* Evaluates whether the argument is an "IPv4 mapped" IPv6 address.
|
|
*
|
|
* <p>An "IPv4 mapped" address is anything in the range ::ffff:0:0/96 (sometimes written as
|
|
* ::ffff:0.0.0.0/96), with the last 32 bits interpreted as an IPv4 address.
|
|
*
|
|
* <p>For more on IPv4 mapped addresses see section 2.5.5.2 of <a target="_parent"
|
|
* href="http://tools.ietf.org/html/rfc4291#section-2.5.5.2">RFC 4291</a>.
|
|
*
|
|
* <p>Note: This method takes a {@code String} argument because {@link InetAddress} automatically
|
|
* collapses mapped addresses to IPv4. (It is actually possible to avoid this using one of the
|
|
* obscure {@link Inet6Address} methods, but it would be unwise to depend on such a
|
|
* poorly-documented feature.)
|
|
*
|
|
* @param ipString {@code String} to be examined for embedded IPv4-mapped IPv6 address format
|
|
* @return {@code true} if the argument is a valid "mapped" address
|
|
* @since 10.0
|
|
*/
|
|
public static boolean isMappedIPv4Address(String ipString) {
|
|
byte[] bytes = ipStringToBytes(ipString);
|
|
if (bytes != null && bytes.length == 16) {
|
|
for (int i = 0; i < 10; i++) {
|
|
if (bytes[i] != 0) {
|
|
return false;
|
|
}
|
|
}
|
|
for (int i = 10; i < 12; i++) {
|
|
if (bytes[i] != (byte) 0xff) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Coerces an IPv6 address into an IPv4 address.
|
|
*
|
|
* <p>HACK: As long as applications continue to use IPv4 addresses for indexing into tables,
|
|
* accounting, et cetera, it may be necessary to <b>coerce</b> IPv6 addresses into IPv4 addresses.
|
|
* This function does so by hashing 64 bits of the IPv6 address into {@code 224.0.0.0/3} (64 bits
|
|
* into 29 bits):
|
|
*
|
|
* <ul>
|
|
* <li>If the IPv6 address contains an embedded IPv4 address, the function hashes that.
|
|
* <li>Otherwise, it hashes the upper 64 bits of the IPv6 address.
|
|
* </ul>
|
|
*
|
|
* <p>A "coerced" IPv4 address is equivalent to itself.
|
|
*
|
|
* <p>NOTE: This function is failsafe for security purposes: ALL IPv6 addresses (except localhost
|
|
* (::1)) are hashed to avoid the security risk associated with extracting an embedded IPv4
|
|
* address that might permit elevated privileges.
|
|
*
|
|
* @param ip {@link InetAddress} to "coerce"
|
|
* @return {@link Inet4Address} represented "coerced" address
|
|
* @since 7.0
|
|
*/
|
|
public static Inet4Address getCoercedIPv4Address(InetAddress ip) {
|
|
if (ip instanceof Inet4Address) {
|
|
return (Inet4Address) ip;
|
|
}
|
|
|
|
// Special cases:
|
|
byte[] bytes = ip.getAddress();
|
|
boolean leadingBytesOfZero = true;
|
|
for (int i = 0; i < 15; ++i) {
|
|
if (bytes[i] != 0) {
|
|
leadingBytesOfZero = false;
|
|
break;
|
|
}
|
|
}
|
|
if (leadingBytesOfZero && (bytes[15] == 1)) {
|
|
return LOOPBACK4; // ::1
|
|
} else if (leadingBytesOfZero && (bytes[15] == 0)) {
|
|
return ANY4; // ::0
|
|
}
|
|
|
|
Inet6Address ip6 = (Inet6Address) ip;
|
|
long addressAsLong = 0;
|
|
if (hasEmbeddedIPv4ClientAddress(ip6)) {
|
|
addressAsLong = getEmbeddedIPv4ClientAddress(ip6).hashCode();
|
|
} else {
|
|
// Just extract the high 64 bits (assuming the rest is user-modifiable).
|
|
addressAsLong = ByteBuffer.wrap(ip6.getAddress(), 0, 8).getLong();
|
|
}
|
|
|
|
// Many strategies for hashing are possible. This might suffice for now.
|
|
int coercedHash = Hashing.murmur3_32().hashLong(addressAsLong).asInt();
|
|
|
|
// Squash into 224/4 Multicast and 240/4 Reserved space (i.e. 224/3).
|
|
coercedHash |= 0xe0000000;
|
|
|
|
// Fixup to avoid some "illegal" values. Currently the only potential
|
|
// illegal value is 255.255.255.255.
|
|
if (coercedHash == 0xffffffff) {
|
|
coercedHash = 0xfffffffe;
|
|
}
|
|
|
|
return getInet4Address(Ints.toByteArray(coercedHash));
|
|
}
|
|
|
|
/**
|
|
* Returns an integer representing an IPv4 address regardless of whether the supplied argument is
|
|
* an IPv4 address or not.
|
|
*
|
|
* <p>IPv6 addresses are <b>coerced</b> to IPv4 addresses before being converted to integers.
|
|
*
|
|
* <p>As long as there are applications that assume that all IP addresses are IPv4 addresses and
|
|
* can therefore be converted safely to integers (for whatever purpose) this function can be used
|
|
* to handle IPv6 addresses as well until the application is suitably fixed.
|
|
*
|
|
* <p>NOTE: an IPv6 address coerced to an IPv4 address can only be used for such purposes as
|
|
* rudimentary identification or indexing into a collection of real {@link InetAddress}es. They
|
|
* cannot be used as real addresses for the purposes of network communication.
|
|
*
|
|
* @param ip {@link InetAddress} to convert
|
|
* @return {@code int}, "coerced" if ip is not an IPv4 address
|
|
* @since 7.0
|
|
*/
|
|
public static int coerceToInteger(InetAddress ip) {
|
|
return ByteStreams.newDataInput(getCoercedIPv4Address(ip).getAddress()).readInt();
|
|
}
|
|
|
|
/**
|
|
* Returns a BigInteger representing the address.
|
|
*
|
|
* <p>Unlike {@code coerceToInteger}, IPv6 addresses are not coerced to IPv4 addresses.
|
|
*
|
|
* @param address {@link InetAddress} to convert
|
|
* @return {@code BigInteger} representation of the address
|
|
* @since NEXT
|
|
*/
|
|
public static BigInteger toBigInteger(InetAddress address) {
|
|
return new BigInteger(1, address.getAddress());
|
|
}
|
|
|
|
/**
|
|
* Returns an Inet4Address having the integer value specified by the argument.
|
|
*
|
|
* @param address {@code int}, the 32bit integer address to be converted
|
|
* @return {@link Inet4Address} equivalent of the argument
|
|
*/
|
|
public static Inet4Address fromInteger(int address) {
|
|
return getInet4Address(Ints.toByteArray(address));
|
|
}
|
|
|
|
/**
|
|
* Returns the {@code Inet4Address} corresponding to a given {@code BigInteger}.
|
|
*
|
|
* @param address BigInteger representing the IPv4 address
|
|
* @return Inet4Address representation of the given BigInteger
|
|
* @throws IllegalArgumentException if the BigInteger is not between 0 and 2^32-1
|
|
* @since NEXT
|
|
*/
|
|
public static Inet4Address fromIpv4BigInteger(BigInteger address) {
|
|
return (Inet4Address) fromBigInteger(address, false);
|
|
}
|
|
/**
|
|
* Returns the {@code Inet6Address} corresponding to a given {@code BigInteger}.
|
|
*
|
|
* @param address BigInteger representing the IPv6 address
|
|
* @return Inet6Address representation of the given BigInteger
|
|
* @throws IllegalArgumentException if the BigInteger is not between 0 and 2^128-1
|
|
* @since NEXT
|
|
*/
|
|
public static Inet6Address fromIpv6BigInteger(BigInteger address) {
|
|
return (Inet6Address) fromBigInteger(address, true);
|
|
}
|
|
|
|
/**
|
|
* Converts a BigInteger to either an IPv4 or IPv6 address. If the IP is IPv4, it must be
|
|
* constrainted to 32 bits, otherwise it is constrained to 128 bits.
|
|
*
|
|
* @param address the address represented as a big integer
|
|
* @param isIpv6 whether the created address should be IPv4 or IPv6
|
|
* @return the BigInteger converted to an address
|
|
* @throws IllegalArgumentException if the BigInteger is not between 0 and maximum value for IPv4
|
|
* or IPv6 respectively
|
|
*/
|
|
private static InetAddress fromBigInteger(BigInteger address, boolean isIpv6) {
|
|
checkArgument(address.signum() >= 0, "BigInteger must be greater than or equal to 0");
|
|
|
|
int numBytes = isIpv6 ? 16 : 4;
|
|
|
|
byte[] addressBytes = address.toByteArray();
|
|
byte[] targetCopyArray = new byte[numBytes];
|
|
|
|
int srcPos = Math.max(0, addressBytes.length - numBytes);
|
|
int copyLength = addressBytes.length - srcPos;
|
|
int destPos = numBytes - copyLength;
|
|
|
|
// Check the extra bytes in the BigInteger are all zero.
|
|
for (int i = 0; i < srcPos; i++) {
|
|
if (addressBytes[i] != 0x00) {
|
|
throw formatIllegalArgumentException(
|
|
"BigInteger cannot be converted to InetAddress because it has more than %d"
|
|
+ " bytes: %s",
|
|
numBytes, address);
|
|
}
|
|
}
|
|
|
|
// Copy the bytes into the least significant positions.
|
|
System.arraycopy(addressBytes, srcPos, targetCopyArray, destPos, copyLength);
|
|
|
|
try {
|
|
return InetAddress.getByAddress(targetCopyArray);
|
|
} catch (UnknownHostException impossible) {
|
|
throw new AssertionError(impossible);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns an address from a <b>little-endian ordered</b> byte array (the opposite of what {@link
|
|
* InetAddress#getByAddress} expects).
|
|
*
|
|
* <p>IPv4 address byte array must be 4 bytes long and IPv6 byte array must be 16 bytes long.
|
|
*
|
|
* @param addr the raw IP address in little-endian byte order
|
|
* @return an InetAddress object created from the raw IP address
|
|
* @throws UnknownHostException if IP address is of illegal length
|
|
*/
|
|
public static InetAddress fromLittleEndianByteArray(byte[] addr) throws UnknownHostException {
|
|
byte[] reversed = new byte[addr.length];
|
|
for (int i = 0; i < addr.length; i++) {
|
|
reversed[i] = addr[addr.length - i - 1];
|
|
}
|
|
return InetAddress.getByAddress(reversed);
|
|
}
|
|
|
|
/**
|
|
* Returns a new InetAddress that is one less than the passed in address. This method works for
|
|
* both IPv4 and IPv6 addresses.
|
|
*
|
|
* @param address the InetAddress to decrement
|
|
* @return a new InetAddress that is one less than the passed in address
|
|
* @throws IllegalArgumentException if InetAddress is at the beginning of its range
|
|
* @since 18.0
|
|
*/
|
|
public static InetAddress decrement(InetAddress address) {
|
|
byte[] addr = address.getAddress();
|
|
int i = addr.length - 1;
|
|
while (i >= 0 && addr[i] == (byte) 0x00) {
|
|
addr[i] = (byte) 0xff;
|
|
i--;
|
|
}
|
|
|
|
checkArgument(i >= 0, "Decrementing %s would wrap.", address);
|
|
|
|
addr[i]--;
|
|
return bytesToInetAddress(addr);
|
|
}
|
|
|
|
/**
|
|
* Returns a new InetAddress that is one more than the passed in address. This method works for
|
|
* both IPv4 and IPv6 addresses.
|
|
*
|
|
* @param address the InetAddress to increment
|
|
* @return a new InetAddress that is one more than the passed in address
|
|
* @throws IllegalArgumentException if InetAddress is at the end of its range
|
|
* @since 10.0
|
|
*/
|
|
public static InetAddress increment(InetAddress address) {
|
|
byte[] addr = address.getAddress();
|
|
int i = addr.length - 1;
|
|
while (i >= 0 && addr[i] == (byte) 0xff) {
|
|
addr[i] = 0;
|
|
i--;
|
|
}
|
|
|
|
checkArgument(i >= 0, "Incrementing %s would wrap.", address);
|
|
|
|
addr[i]++;
|
|
return bytesToInetAddress(addr);
|
|
}
|
|
|
|
/**
|
|
* Returns true if the InetAddress is either 255.255.255.255 for IPv4 or
|
|
* ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff for IPv6.
|
|
*
|
|
* @return true if the InetAddress is either 255.255.255.255 for IPv4 or
|
|
* ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff for IPv6
|
|
* @since 10.0
|
|
*/
|
|
public static boolean isMaximum(InetAddress address) {
|
|
byte[] addr = address.getAddress();
|
|
for (int i = 0; i < addr.length; i++) {
|
|
if (addr[i] != (byte) 0xff) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
private static IllegalArgumentException formatIllegalArgumentException(
|
|
String format, Object... args) {
|
|
return new IllegalArgumentException(String.format(Locale.ROOT, format, args));
|
|
}
|
|
}
|