1152 lines
47 KiB
Java
1152 lines
47 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* 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
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package dorkbox.network.other;
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import static io.netty.util.AsciiString.indexOf;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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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.InetSocketAddress;
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import java.net.NetworkInterface;
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import java.net.SocketException;
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import java.net.UnknownHostException;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.ArrayList;
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import java.util.Enumeration;
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import java.util.List;
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import io.netty.util.AsciiString;
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import io.netty.util.internal.PlatformDependent;
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import io.netty.util.internal.SocketUtils;
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import io.netty.util.internal.StringUtil;
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import io.netty.util.internal.SystemPropertyUtil;
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import io.netty.util.internal.logging.InternalLogger;
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import io.netty.util.internal.logging.InternalLoggerFactory;
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/**
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* A class that holds a number of network-related constants.
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* <p/>
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* This class borrowed some of its methods from a modified fork of the
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* <a href="http://svn.apache.org/repos/asf/harmony/enhanced/java/branches/java6/classlib/modules/luni/
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* src/main/java/org/apache/harmony/luni/util/Inet6Util.java">Inet6Util class</a> which was part of Apache Harmony.
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*/
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public final class NetUtil {
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/**
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* The {@link Inet4Address} that represents the IPv4 loopback address '127.0.0.1'
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*/
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public static final Inet4Address LOCALHOST4;
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/**
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* The {@link Inet6Address} that represents the IPv6 loopback address '::1'
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*/
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public static final Inet6Address LOCALHOST6;
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/**
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* The {@link InetAddress} that represents the loopback address. If IPv6 stack is available, it will refer to
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* {@link #LOCALHOST6}. Otherwise, {@link #LOCALHOST4}.
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*/
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public static final InetAddress LOCALHOST;
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/**
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* The loopback {@link NetworkInterface} of the current machine
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*/
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public static final NetworkInterface LOOPBACK_IF;
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/**
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* The SOMAXCONN value of the current machine. If failed to get the value, {@code 200} is used as a
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* default value for Windows or {@code 128} for others.
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*/
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public static final int SOMAXCONN;
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/**
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* This defines how many words (represented as ints) are needed to represent an IPv6 address
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*/
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private static final int IPV6_WORD_COUNT = 8;
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/**
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* The maximum number of characters for an IPV6 string with no scope
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*/
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private static final int IPV6_MAX_CHAR_COUNT = 39;
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/**
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* Number of bytes needed to represent and IPV6 value
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*/
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private static final int IPV6_BYTE_COUNT = 16;
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/**
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* Maximum amount of value adding characters in between IPV6 separators
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*/
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private static final int IPV6_MAX_CHAR_BETWEEN_SEPARATOR = 4;
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/**
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* Minimum number of separators that must be present in an IPv6 string
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*/
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private static final int IPV6_MIN_SEPARATORS = 2;
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/**
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* Maximum number of separators that must be present in an IPv6 string
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*/
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private static final int IPV6_MAX_SEPARATORS = 8;
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/**
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* Maximum amount of value adding characters in between IPV4 separators
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*/
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private static final int IPV4_MAX_CHAR_BETWEEN_SEPARATOR = 3;
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/**
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* Number of separators that must be present in an IPv4 string
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*/
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private static final int IPV4_SEPARATORS = 3;
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/**
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* {@code true} if IPv4 should be used even if the system supports both IPv4 and IPv6.
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*/
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private static final boolean IPV4_PREFERRED = SystemPropertyUtil.getBoolean("java.net.preferIPv4Stack", false);
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/**
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* {@code true} if an IPv6 address should be preferred when a host has both an IPv4 address and an IPv6 address.
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*/
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private static final boolean IPV6_ADDRESSES_PREFERRED =
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SystemPropertyUtil.getBoolean("java.net.preferIPv6Addresses", false);
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/**
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* The logger being used by this class
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*/
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private static final InternalLogger logger = InternalLoggerFactory.getInstance(NetUtil.class);
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static {
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logger.debug("-Djava.net.preferIPv4Stack: {}", IPV4_PREFERRED);
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logger.debug("-Djava.net.preferIPv6Addresses: {}", IPV6_ADDRESSES_PREFERRED);
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byte[] LOCALHOST4_BYTES = {127, 0, 0, 1};
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byte[] LOCALHOST6_BYTES = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
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// Create IPv4 loopback address.
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Inet4Address localhost4 = null;
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try {
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localhost4 = (Inet4Address) InetAddress.getByAddress("localhost", LOCALHOST4_BYTES);
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} catch (Exception e) {
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// We should not get here as long as the length of the address is correct.
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PlatformDependent.throwException(e);
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}
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LOCALHOST4 = localhost4;
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// Create IPv6 loopback address.
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Inet6Address localhost6 = null;
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try {
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localhost6 = (Inet6Address) InetAddress.getByAddress("localhost", LOCALHOST6_BYTES);
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} catch (Exception e) {
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// We should not get here as long as the length of the address is correct.
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PlatformDependent.throwException(e);
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}
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LOCALHOST6 = localhost6;
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// Retrieve the list of available network interfaces.
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List<NetworkInterface> ifaces = new ArrayList<NetworkInterface>();
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try {
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Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
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if (interfaces != null) {
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while (interfaces.hasMoreElements()) {
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NetworkInterface iface = interfaces.nextElement();
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// Use the interface with proper INET addresses only.
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if (SocketUtils.addressesFromNetworkInterface(iface).hasMoreElements()) {
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ifaces.add(iface);
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}
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}
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}
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} catch (SocketException e) {
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logger.warn("Failed to retrieve the list of available network interfaces", e);
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}
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// Find the first loopback interface available from its INET address (127.0.0.1 or ::1)
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// Note that we do not use NetworkInterface.isLoopback() in the first place because it takes long time
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// on a certain environment. (e.g. Windows with -Djava.net.preferIPv4Stack=true)
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NetworkInterface loopbackIface = null;
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InetAddress loopbackAddr = null;
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loop: for (NetworkInterface iface: ifaces) {
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for (Enumeration<InetAddress> i = SocketUtils.addressesFromNetworkInterface(iface); i.hasMoreElements();) {
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InetAddress addr = i.nextElement();
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if (addr.isLoopbackAddress()) {
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// Found
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loopbackIface = iface;
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loopbackAddr = addr;
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break loop;
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}
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}
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}
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// If failed to find the loopback interface from its INET address, fall back to isLoopback().
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if (loopbackIface == null) {
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try {
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for (NetworkInterface iface: ifaces) {
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if (iface.isLoopback()) {
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Enumeration<InetAddress> i = SocketUtils.addressesFromNetworkInterface(iface);
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if (i.hasMoreElements()) {
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// Found the one with INET address.
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loopbackIface = iface;
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loopbackAddr = i.nextElement();
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break;
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}
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}
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}
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if (loopbackIface == null) {
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logger.warn("Failed to find the loopback interface");
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}
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} catch (SocketException e) {
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logger.warn("Failed to find the loopback interface", e);
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}
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}
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if (loopbackIface != null) {
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// Found the loopback interface with an INET address.
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logger.debug(
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"Loopback interface: {} ({}, {})",
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loopbackIface.getName(), loopbackIface.getDisplayName(), loopbackAddr.getHostAddress());
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} else {
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// Could not find the loopback interface, but we can't leave LOCALHOST as null.
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// Use LOCALHOST6 or LOCALHOST4, preferably the IPv6 one.
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if (loopbackAddr == null) {
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try {
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if (NetworkInterface.getByInetAddress(LOCALHOST6) != null) {
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logger.debug("Using hard-coded IPv6 localhost address: {}", localhost6);
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loopbackAddr = localhost6;
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}
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} catch (Exception e) {
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// Ignore
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} finally {
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if (loopbackAddr == null) {
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logger.debug("Using hard-coded IPv4 localhost address: {}", localhost4);
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loopbackAddr = localhost4;
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}
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}
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}
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}
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LOOPBACK_IF = loopbackIface;
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LOCALHOST = loopbackAddr;
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// As a SecurityManager may prevent reading the somaxconn file we wrap this in a privileged block.
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//
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// See https://github.com/netty/netty/issues/3680
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SOMAXCONN = AccessController.doPrivileged(new PrivilegedAction<Integer>() {
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@Override
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public Integer run() {
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// Determine the default somaxconn (server socket backlog) value of the platform.
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// The known defaults:
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// - Windows NT Server 4.0+: 200
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// - Linux and Mac OS X: 128
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int somaxconn = PlatformDependent.isWindows() ? 200 : 128;
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File file = new File("/proc/sys/net/core/somaxconn");
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BufferedReader in = null;
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try {
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// file.exists() may throw a SecurityException if a SecurityManager is used, so execute it in the
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// try / catch block.
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// See https://github.com/netty/netty/issues/4936
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if (file.exists()) {
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in = new BufferedReader(new FileReader(file));
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somaxconn = Integer.parseInt(in.readLine());
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if (logger.isDebugEnabled()) {
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logger.debug("{}: {}", file, somaxconn);
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}
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} else {
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// Try to get from sysctl
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Integer tmp = null;
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if (SystemPropertyUtil.getBoolean("io.netty.net.somaxconn.trySysctl", false)) {
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tmp = sysctlGetInt("kern.ipc.somaxconn");
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if (tmp == null) {
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tmp = sysctlGetInt("kern.ipc.soacceptqueue");
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if (tmp != null) {
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somaxconn = tmp;
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}
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} else {
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somaxconn = tmp;
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}
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}
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if (tmp == null) {
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logger.debug("Failed to get SOMAXCONN from sysctl and file {}. Default: {}", file,
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somaxconn);
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}
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}
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} catch (Exception e) {
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if (logger.isDebugEnabled()) {
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logger.debug("Failed to get SOMAXCONN from sysctl and file {}. Default: {}",
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file, somaxconn, e);
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}
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} finally {
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if (in != null) {
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try {
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in.close();
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} catch (Exception e) {
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// Ignored.
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}
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}
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}
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return somaxconn;
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}
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});
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}
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/**
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* This will execute <a href ="https://www.freebsd.org/cgi/man.cgi?sysctl(8)">sysctl</a> with the {@code sysctlKey}
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* which is expected to return the numeric value for for {@code sysctlKey}.
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* @param sysctlKey The key which the return value corresponds to.
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* @return The <a href ="https://www.freebsd.org/cgi/man.cgi?sysctl(8)">sysctl</a> value for {@code sysctlKey}.
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*/
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public static Integer sysctlGetInt(String sysctlKey) throws IOException {
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Process process = new ProcessBuilder("sysctl", sysctlKey).start();
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try {
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InputStream is = process.getInputStream();
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InputStreamReader isr = new InputStreamReader(is);
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BufferedReader br = new BufferedReader(isr);
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try {
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String line = br.readLine();
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if (line != null && line.startsWith(sysctlKey)) {
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for (int i = line.length() - 1; i > sysctlKey.length(); --i) {
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if (!Character.isDigit(line.charAt(i))) {
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return Integer.valueOf(line.substring(i + 1));
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}
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}
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}
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return null;
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} finally {
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br.close();
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}
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} finally {
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if (process != null) {
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process.destroy();
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}
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}
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}
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/**
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* Returns {@code true} if IPv4 should be used even if the system supports both IPv4 and IPv6. Setting this
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* property to {@code true} will disable IPv6 support. The default value of this property is {@code false}.
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*
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* @see <a href="https://docs.oracle.com/javase/8/docs/api/java/net/doc-files/net-properties.html">Java SE
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* networking properties</a>
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*/
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public static boolean isIpV4StackPreferred() {
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return IPV4_PREFERRED;
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}
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/**
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* Returns {@code true} if an IPv6 address should be preferred when a host has both an IPv4 address and an IPv6
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* address. The default value of this property is {@code false}.
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*
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* @see <a href="https://docs.oracle.com/javase/8/docs/api/java/net/doc-files/net-properties.html">Java SE
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* networking properties</a>
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*/
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public static boolean isIpV6AddressesPreferred() {
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return IPV6_ADDRESSES_PREFERRED;
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}
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/**
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* Creates an byte[] based on an ipAddressString. No error handling is performed here.
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*/
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public static byte[] createByteArrayFromIpAddressString(String ipAddressString) {
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if (isValidIpV4Address(ipAddressString)) {
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return validIpV4ToBytes(ipAddressString);
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}
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if (isValidIpV6Address(ipAddressString)) {
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if (ipAddressString.charAt(0) == '[') {
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ipAddressString = ipAddressString.substring(1, ipAddressString.length() - 1);
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}
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int percentPos = ipAddressString.indexOf('%');
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if (percentPos >= 0) {
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ipAddressString = ipAddressString.substring(0, percentPos);
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}
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return getIPv6ByName(ipAddressString, true);
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}
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return null;
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}
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private static int decimalDigit(String str, int pos) {
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return str.charAt(pos) - '0';
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}
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private static byte ipv4WordToByte(String ip, int from, int toExclusive) {
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int ret = decimalDigit(ip, from);
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from++;
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if (from == toExclusive) {
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return (byte) ret;
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}
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ret = ret * 10 + decimalDigit(ip, from);
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from++;
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if (from == toExclusive) {
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return (byte) ret;
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}
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return (byte) (ret * 10 + decimalDigit(ip, from));
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}
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// visible for tests
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static byte[] validIpV4ToBytes(String ip) {
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int i;
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return new byte[] {
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ipv4WordToByte(ip, 0, i = ip.indexOf('.', 1)),
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ipv4WordToByte(ip, i + 1, i = ip.indexOf('.', i + 2)),
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ipv4WordToByte(ip, i + 1, i = ip.indexOf('.', i + 2)),
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ipv4WordToByte(ip, i + 1, ip.length())
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};
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}
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/**
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* Converts a 32-bit integer into an IPv4 address.
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*/
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public static String intToIpAddress(int i) {
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StringBuilder buf = new StringBuilder(15);
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buf.append(i >> 24 & 0xff);
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buf.append('.');
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buf.append(i >> 16 & 0xff);
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buf.append('.');
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buf.append(i >> 8 & 0xff);
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buf.append('.');
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buf.append(i & 0xff);
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return buf.toString();
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}
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/**
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* Converts 4-byte or 16-byte data into an IPv4 or IPv6 string respectively.
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*
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* @throws IllegalArgumentException
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* if {@code length} is not {@code 4} nor {@code 16}
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*/
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public static String bytesToIpAddress(byte[] bytes) {
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return bytesToIpAddress(bytes, 0, bytes.length);
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}
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/**
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* Converts 4-byte or 16-byte data into an IPv4 or IPv6 string respectively.
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*
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* @throws IllegalArgumentException
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* if {@code length} is not {@code 4} nor {@code 16}
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*/
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public static String bytesToIpAddress(byte[] bytes, int offset, int length) {
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switch (length) {
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case 4: {
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return new StringBuilder(15)
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.append(bytes[offset] & 0xff)
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.append('.')
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.append(bytes[offset + 1] & 0xff)
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.append('.')
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.append(bytes[offset + 2] & 0xff)
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.append('.')
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.append(bytes[offset + 3] & 0xff).toString();
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}
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case 16:
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return toAddressString(bytes, offset, false);
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default:
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throw new IllegalArgumentException("length: " + length + " (expected: 4 or 16)");
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}
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}
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public static boolean isValidIpV6Address(String ip) {
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return isValidIpV6Address((CharSequence) ip);
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}
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public static boolean isValidIpV6Address(CharSequence ip) {
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int end = ip.length();
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if (end < 2) {
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return false;
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}
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// strip "[]"
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int start;
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char c = ip.charAt(0);
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if (c == '[') {
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end--;
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if (ip.charAt(end) != ']') {
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// must have a close ]
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return false;
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}
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start = 1;
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c = ip.charAt(1);
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} else {
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start = 0;
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}
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int colons;
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int compressBegin;
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if (c == ':') {
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// an IPv6 address can start with "::" or with a number
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if (ip.charAt(start + 1) != ':') {
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return false;
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}
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colons = 2;
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compressBegin = start;
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start += 2;
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} else {
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colons = 0;
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compressBegin = -1;
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}
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int wordLen = 0;
|
|
loop:
|
|
for (int i = start; i < end; i++) {
|
|
c = ip.charAt(i);
|
|
if (isValidHexChar(c)) {
|
|
if (wordLen < 4) {
|
|
wordLen++;
|
|
continue;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
switch (c) {
|
|
case ':':
|
|
if (colons > 7) {
|
|
return false;
|
|
}
|
|
if (ip.charAt(i - 1) == ':') {
|
|
if (compressBegin >= 0) {
|
|
return false;
|
|
}
|
|
compressBegin = i - 1;
|
|
} else {
|
|
wordLen = 0;
|
|
}
|
|
colons++;
|
|
break;
|
|
case '.':
|
|
// case for the last 32-bits represented as IPv4 x:x:x:x:x:x:d.d.d.d
|
|
|
|
// check a normal case (6 single colons)
|
|
if (compressBegin < 0 && colons != 6 ||
|
|
// a special case ::1:2:3:4:5:d.d.d.d allows 7 colons with an
|
|
// IPv4 ending, otherwise 7 :'s is bad
|
|
(colons == 7 && compressBegin >= start || colons > 7)) {
|
|
return false;
|
|
}
|
|
|
|
// Verify this address is of the correct structure to contain an IPv4 address.
|
|
// It must be IPv4-Mapped or IPv4-Compatible
|
|
// (see https://tools.ietf.org/html/rfc4291#section-2.5.5).
|
|
int ipv4Start = i - wordLen;
|
|
int j = ipv4Start - 2; // index of character before the previous ':'.
|
|
if (isValidIPv4MappedChar(ip.charAt(j))) {
|
|
if (!isValidIPv4MappedChar(ip.charAt(j - 1)) ||
|
|
!isValidIPv4MappedChar(ip.charAt(j - 2)) ||
|
|
!isValidIPv4MappedChar(ip.charAt(j - 3))) {
|
|
return false;
|
|
}
|
|
j -= 5;
|
|
}
|
|
|
|
for (; j >= start; --j) {
|
|
char tmpChar = ip.charAt(j);
|
|
if (tmpChar != '0' && tmpChar != ':') {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// 7 - is minimum IPv4 address length
|
|
int ipv4End = indexOf(ip, '%', ipv4Start + 7);
|
|
if (ipv4End < 0) {
|
|
ipv4End = end;
|
|
}
|
|
return isValidIpV4Address(ip, ipv4Start, ipv4End);
|
|
case '%':
|
|
// strip the interface name/index after the percent sign
|
|
end = i;
|
|
break loop;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// normal case without compression
|
|
if (compressBegin < 0) {
|
|
return colons == 7 && wordLen > 0;
|
|
}
|
|
|
|
return compressBegin + 2 == end ||
|
|
// 8 colons is valid only if compression in start or end
|
|
wordLen > 0 && (colons < 8 || compressBegin <= start);
|
|
}
|
|
|
|
private static boolean isValidIpV4Word(CharSequence word, int from, int toExclusive) {
|
|
int len = toExclusive - from;
|
|
char c0, c1, c2;
|
|
if (len < 1 || len > 3 || (c0 = word.charAt(from)) < '0') {
|
|
return false;
|
|
}
|
|
if (len == 3) {
|
|
return (c1 = word.charAt(from + 1)) >= '0' &&
|
|
(c2 = word.charAt(from + 2)) >= '0' &&
|
|
(c0 <= '1' && c1 <= '9' && c2 <= '9' ||
|
|
c0 == '2' && c1 <= '5' && (c2 <= '5' || c1 < '5' && c2 <= '9'));
|
|
}
|
|
return c0 <= '9' && (len == 1 || isValidNumericChar(word.charAt(from + 1)));
|
|
}
|
|
|
|
private static boolean isValidHexChar(char c) {
|
|
return c >= '0' && c <= '9' || c >= 'A' && c <= 'F' || c >= 'a' && c <= 'f';
|
|
}
|
|
|
|
private static boolean isValidNumericChar(char c) {
|
|
return c >= '0' && c <= '9';
|
|
}
|
|
|
|
private static boolean isValidIPv4MappedChar(char c) {
|
|
return c == 'f' || c == 'F';
|
|
}
|
|
|
|
private static boolean isValidIPv4MappedSeparators(byte b0, byte b1, boolean mustBeZero) {
|
|
// We allow IPv4 Mapped (https://tools.ietf.org/html/rfc4291#section-2.5.5.1)
|
|
// and IPv4 compatible (https://tools.ietf.org/html/rfc4291#section-2.5.5.1).
|
|
// The IPv4 compatible is deprecated, but it allows parsing of plain IPv4 addressed into IPv6-Mapped addresses.
|
|
return b0 == b1 && (b0 == 0 || !mustBeZero && b1 == -1);
|
|
}
|
|
|
|
private static boolean isValidIPv4Mapped(byte[] bytes, int currentIndex, int compressBegin, int compressLength) {
|
|
final boolean mustBeZero = compressBegin + compressLength >= 14;
|
|
return currentIndex <= 12 && currentIndex >= 2 && (!mustBeZero || compressBegin < 12) &&
|
|
isValidIPv4MappedSeparators(bytes[currentIndex - 1], bytes[currentIndex - 2], mustBeZero) &&
|
|
PlatformDependent.isZero(bytes, 0, currentIndex - 3);
|
|
}
|
|
|
|
/**
|
|
* Takes a {@link CharSequence} and parses it to see if it is a valid IPV4 address.
|
|
*
|
|
* @return true, if the string represents an IPV4 address in dotted
|
|
* notation, false otherwise
|
|
*/
|
|
public static boolean isValidIpV4Address(CharSequence ip) {
|
|
return isValidIpV4Address(ip, 0, ip.length());
|
|
}
|
|
|
|
/**
|
|
* Takes a {@link String} and parses it to see if it is a valid IPV4 address.
|
|
*
|
|
* @return true, if the string represents an IPV4 address in dotted
|
|
* notation, false otherwise
|
|
*/
|
|
public static boolean isValidIpV4Address(String ip) {
|
|
return isValidIpV4Address(ip, 0, ip.length());
|
|
}
|
|
|
|
private static boolean isValidIpV4Address(CharSequence ip, int from, int toExcluded) {
|
|
return ip instanceof String ? isValidIpV4Address((String) ip, from, toExcluded) :
|
|
ip instanceof AsciiString ? isValidIpV4Address((AsciiString) ip, from, toExcluded) :
|
|
isValidIpV4Address0(ip, from, toExcluded);
|
|
}
|
|
|
|
@SuppressWarnings("DuplicateBooleanBranch")
|
|
private static boolean isValidIpV4Address(String ip, int from, int toExcluded) {
|
|
int len = toExcluded - from;
|
|
int i;
|
|
return len <= 15 && len >= 7 &&
|
|
(i = ip.indexOf('.', from + 1)) > 0 && isValidIpV4Word(ip, from, i) &&
|
|
(i = ip.indexOf('.', from = i + 2)) > 0 && isValidIpV4Word(ip, from - 1, i) &&
|
|
(i = ip.indexOf('.', from = i + 2)) > 0 && isValidIpV4Word(ip, from - 1, i) &&
|
|
isValidIpV4Word(ip, i + 1, toExcluded);
|
|
}
|
|
|
|
@SuppressWarnings("DuplicateBooleanBranch")
|
|
private static boolean isValidIpV4Address(AsciiString ip, int from, int toExcluded) {
|
|
int len = toExcluded - from;
|
|
int i;
|
|
return len <= 15 && len >= 7 &&
|
|
(i = ip.indexOf('.', from + 1)) > 0 && isValidIpV4Word(ip, from, i) &&
|
|
(i = ip.indexOf('.', from = i + 2)) > 0 && isValidIpV4Word(ip, from - 1, i) &&
|
|
(i = ip.indexOf('.', from = i + 2)) > 0 && isValidIpV4Word(ip, from - 1, i) &&
|
|
isValidIpV4Word(ip, i + 1, toExcluded);
|
|
}
|
|
|
|
@SuppressWarnings("DuplicateBooleanBranch")
|
|
private static boolean isValidIpV4Address0(CharSequence ip, int from, int toExcluded) {
|
|
int len = toExcluded - from;
|
|
int i;
|
|
return len <= 15 && len >= 7 &&
|
|
(i = indexOf(ip, '.', from + 1)) > 0 && isValidIpV4Word(ip, from, i) &&
|
|
(i = indexOf(ip, '.', from = i + 2)) > 0 && isValidIpV4Word(ip, from - 1, i) &&
|
|
(i = indexOf(ip, '.', from = i + 2)) > 0 && isValidIpV4Word(ip, from - 1, i) &&
|
|
isValidIpV4Word(ip, i + 1, toExcluded);
|
|
}
|
|
|
|
/**
|
|
* Returns the {@link Inet6Address} representation of a {@link CharSequence} IP address.
|
|
* <p>
|
|
* This method will treat all IPv4 type addresses as "IPv4 mapped" (see {@link #getByName(CharSequence, boolean)})
|
|
* @param ip {@link CharSequence} IP address to be converted to a {@link Inet6Address}
|
|
* @return {@link Inet6Address} representation of the {@code ip} or {@code null} if not a valid IP address.
|
|
*/
|
|
public static Inet6Address getByName(CharSequence ip) {
|
|
return getByName(ip, true);
|
|
}
|
|
|
|
/**
|
|
* Returns the {@link Inet6Address} representation of a {@link CharSequence} IP address.
|
|
* <p>
|
|
* The {@code ipv4Mapped} parameter specifies how IPv4 addresses should be treated.
|
|
* "IPv4 mapped" format as
|
|
* defined in <a href="http://tools.ietf.org/html/rfc4291#section-2.5.5">rfc 4291 section 2</a> is supported.
|
|
* @param ip {@link CharSequence} IP address to be converted to a {@link Inet6Address}
|
|
* @param ipv4Mapped
|
|
* <ul>
|
|
* <li>{@code true} To allow IPv4 mapped inputs to be translated into {@link Inet6Address}</li>
|
|
* <li>{@code false} Consider IPv4 mapped addresses as invalid.</li>
|
|
* </ul>
|
|
* @return {@link Inet6Address} representation of the {@code ip} or {@code null} if not a valid IP address.
|
|
*/
|
|
public static Inet6Address getByName(CharSequence ip, boolean ipv4Mapped) {
|
|
byte[] bytes = getIPv6ByName(ip, ipv4Mapped);
|
|
if (bytes == null) {
|
|
return null;
|
|
}
|
|
try {
|
|
return Inet6Address.getByAddress(null, bytes, -1);
|
|
} catch (UnknownHostException e) {
|
|
throw new RuntimeException(e); // Should never happen
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the byte array representation of a {@link CharSequence} IP address.
|
|
* <p>
|
|
* The {@code ipv4Mapped} parameter specifies how IPv4 addresses should be treated.
|
|
* "IPv4 mapped" format as
|
|
* defined in <a href="http://tools.ietf.org/html/rfc4291#section-2.5.5">rfc 4291 section 2</a> is supported.
|
|
* @param ip {@link CharSequence} IP address to be converted to a {@link Inet6Address}
|
|
* @param ipv4Mapped
|
|
* <ul>
|
|
* <li>{@code true} To allow IPv4 mapped inputs to be translated into {@link Inet6Address}</li>
|
|
* <li>{@code false} Consider IPv4 mapped addresses as invalid.</li>
|
|
* </ul>
|
|
* @return byte array representation of the {@code ip} or {@code null} if not a valid IP address.
|
|
*/
|
|
private static byte[] getIPv6ByName(CharSequence ip, boolean ipv4Mapped) {
|
|
final byte[] bytes = new byte[IPV6_BYTE_COUNT];
|
|
final int ipLength = ip.length();
|
|
int compressBegin = 0;
|
|
int compressLength = 0;
|
|
int currentIndex = 0;
|
|
int value = 0;
|
|
int begin = -1;
|
|
int i = 0;
|
|
int ipv6Separators = 0;
|
|
int ipv4Separators = 0;
|
|
int tmp;
|
|
boolean needsShift = false;
|
|
for (; i < ipLength; ++i) {
|
|
final char c = ip.charAt(i);
|
|
switch (c) {
|
|
case ':':
|
|
++ipv6Separators;
|
|
if (i - begin > IPV6_MAX_CHAR_BETWEEN_SEPARATOR ||
|
|
ipv4Separators > 0 || ipv6Separators > IPV6_MAX_SEPARATORS ||
|
|
currentIndex + 1 >= bytes.length) {
|
|
return null;
|
|
}
|
|
value <<= (IPV6_MAX_CHAR_BETWEEN_SEPARATOR - (i - begin)) << 2;
|
|
|
|
if (compressLength > 0) {
|
|
compressLength -= 2;
|
|
}
|
|
|
|
// The value integer holds at most 4 bytes from right (most significant) to left (least significant).
|
|
// The following bit shifting is used to extract and re-order the individual bytes to achieve a
|
|
// left (most significant) to right (least significant) ordering.
|
|
bytes[currentIndex++] = (byte) (((value & 0xf) << 4) | ((value >> 4) & 0xf));
|
|
bytes[currentIndex++] = (byte) ((((value >> 8) & 0xf) << 4) | ((value >> 12) & 0xf));
|
|
tmp = i + 1;
|
|
if (tmp < ipLength && ip.charAt(tmp) == ':') {
|
|
++tmp;
|
|
if (compressBegin != 0 || (tmp < ipLength && ip.charAt(tmp) == ':')) {
|
|
return null;
|
|
}
|
|
++ipv6Separators;
|
|
needsShift = ipv6Separators == 2 && value == 0;
|
|
compressBegin = currentIndex;
|
|
compressLength = bytes.length - compressBegin - 2;
|
|
++i;
|
|
}
|
|
value = 0;
|
|
begin = -1;
|
|
break;
|
|
case '.':
|
|
++ipv4Separators;
|
|
tmp = i - begin; // tmp is the length of the current segment.
|
|
if (tmp > IPV4_MAX_CHAR_BETWEEN_SEPARATOR
|
|
|| begin < 0
|
|
|| ipv4Separators > IPV4_SEPARATORS
|
|
|| (ipv6Separators > 0 && (currentIndex + compressLength < 12))
|
|
|| i + 1 >= ipLength
|
|
|| currentIndex >= bytes.length
|
|
|| ipv4Separators == 1 &&
|
|
// We also parse pure IPv4 addresses as IPv4-Mapped for ease of use.
|
|
((!ipv4Mapped || currentIndex != 0 && !isValidIPv4Mapped(bytes, currentIndex,
|
|
compressBegin, compressLength)) ||
|
|
(tmp == 3 && (!isValidNumericChar(ip.charAt(i - 1)) ||
|
|
!isValidNumericChar(ip.charAt(i - 2)) ||
|
|
!isValidNumericChar(ip.charAt(i - 3))) ||
|
|
tmp == 2 && (!isValidNumericChar(ip.charAt(i - 1)) ||
|
|
!isValidNumericChar(ip.charAt(i - 2))) ||
|
|
tmp == 1 && !isValidNumericChar(ip.charAt(i - 1))))) {
|
|
return null;
|
|
}
|
|
value <<= (IPV4_MAX_CHAR_BETWEEN_SEPARATOR - tmp) << 2;
|
|
|
|
// The value integer holds at most 3 bytes from right (most significant) to left (least significant).
|
|
// The following bit shifting is to restructure the bytes to be left (most significant) to
|
|
// right (least significant) while also accounting for each IPv4 digit is base 10.
|
|
begin = (value & 0xf) * 100 + ((value >> 4) & 0xf) * 10 + ((value >> 8) & 0xf);
|
|
if (begin < 0 || begin > 255) {
|
|
return null;
|
|
}
|
|
bytes[currentIndex++] = (byte) begin;
|
|
value = 0;
|
|
begin = -1;
|
|
break;
|
|
default:
|
|
if (!isValidHexChar(c) || (ipv4Separators > 0 && !isValidNumericChar(c))) {
|
|
return null;
|
|
}
|
|
if (begin < 0) {
|
|
begin = i;
|
|
} else if (i - begin > IPV6_MAX_CHAR_BETWEEN_SEPARATOR) {
|
|
return null;
|
|
}
|
|
// The value is treated as a sort of array of numbers because we are dealing with
|
|
// at most 4 consecutive bytes we can use bit shifting to accomplish this.
|
|
// The most significant byte will be encountered first, and reside in the right most
|
|
// position of the following integer
|
|
value += StringUtil.decodeHexNibble(c) << ((i - begin) << 2);
|
|
break;
|
|
}
|
|
}
|
|
|
|
final boolean isCompressed = compressBegin > 0;
|
|
// Finish up last set of data that was accumulated in the loop (or before the loop)
|
|
if (ipv4Separators > 0) {
|
|
if (begin > 0 && i - begin > IPV4_MAX_CHAR_BETWEEN_SEPARATOR ||
|
|
ipv4Separators != IPV4_SEPARATORS ||
|
|
currentIndex >= bytes.length) {
|
|
return null;
|
|
}
|
|
if (ipv6Separators == 0) {
|
|
compressLength = 12;
|
|
} else if (ipv6Separators >= IPV6_MIN_SEPARATORS &&
|
|
(!isCompressed && (ipv6Separators == 6 && ip.charAt(0) != ':') ||
|
|
isCompressed && (ipv6Separators < IPV6_MAX_SEPARATORS &&
|
|
(ip.charAt(0) != ':' || compressBegin <= 2)))) {
|
|
compressLength -= 2;
|
|
} else {
|
|
return null;
|
|
}
|
|
value <<= (IPV4_MAX_CHAR_BETWEEN_SEPARATOR - (i - begin)) << 2;
|
|
|
|
// The value integer holds at most 3 bytes from right (most significant) to left (least significant).
|
|
// The following bit shifting is to restructure the bytes to be left (most significant) to
|
|
// right (least significant) while also accounting for each IPv4 digit is base 10.
|
|
begin = (value & 0xf) * 100 + ((value >> 4) & 0xf) * 10 + ((value >> 8) & 0xf);
|
|
if (begin < 0 || begin > 255) {
|
|
return null;
|
|
}
|
|
bytes[currentIndex++] = (byte) begin;
|
|
} else {
|
|
tmp = ipLength - 1;
|
|
if (begin > 0 && i - begin > IPV6_MAX_CHAR_BETWEEN_SEPARATOR ||
|
|
ipv6Separators < IPV6_MIN_SEPARATORS ||
|
|
!isCompressed && (ipv6Separators + 1 != IPV6_MAX_SEPARATORS ||
|
|
ip.charAt(0) == ':' || ip.charAt(tmp) == ':') ||
|
|
isCompressed && (ipv6Separators > IPV6_MAX_SEPARATORS ||
|
|
(ipv6Separators == IPV6_MAX_SEPARATORS &&
|
|
(compressBegin <= 2 && ip.charAt(0) != ':' ||
|
|
compressBegin >= 14 && ip.charAt(tmp) != ':'))) ||
|
|
currentIndex + 1 >= bytes.length ||
|
|
begin < 0 && ip.charAt(tmp - 1) != ':' ||
|
|
compressBegin > 2 && ip.charAt(0) == ':') {
|
|
return null;
|
|
}
|
|
if (begin >= 0 && i - begin <= IPV6_MAX_CHAR_BETWEEN_SEPARATOR) {
|
|
value <<= (IPV6_MAX_CHAR_BETWEEN_SEPARATOR - (i - begin)) << 2;
|
|
}
|
|
// The value integer holds at most 4 bytes from right (most significant) to left (least significant).
|
|
// The following bit shifting is used to extract and re-order the individual bytes to achieve a
|
|
// left (most significant) to right (least significant) ordering.
|
|
bytes[currentIndex++] = (byte) (((value & 0xf) << 4) | ((value >> 4) & 0xf));
|
|
bytes[currentIndex++] = (byte) ((((value >> 8) & 0xf) << 4) | ((value >> 12) & 0xf));
|
|
}
|
|
|
|
i = currentIndex + compressLength;
|
|
if (needsShift || i >= bytes.length) {
|
|
// Right shift array
|
|
if (i >= bytes.length) {
|
|
++compressBegin;
|
|
}
|
|
for (i = currentIndex; i < bytes.length; ++i) {
|
|
for (begin = bytes.length - 1; begin >= compressBegin; --begin) {
|
|
bytes[begin] = bytes[begin - 1];
|
|
}
|
|
bytes[begin] = 0;
|
|
++compressBegin;
|
|
}
|
|
} else {
|
|
// Selectively move elements
|
|
for (i = 0; i < compressLength; ++i) {
|
|
begin = i + compressBegin;
|
|
currentIndex = begin + compressLength;
|
|
if (currentIndex < bytes.length) {
|
|
bytes[currentIndex] = bytes[begin];
|
|
bytes[begin] = 0;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ipv4Separators > 0) {
|
|
// We only support IPv4-Mapped addresses [1] because IPv4-Compatible addresses are deprecated [2].
|
|
// [1] https://tools.ietf.org/html/rfc4291#section-2.5.5.2
|
|
// [2] https://tools.ietf.org/html/rfc4291#section-2.5.5.1
|
|
bytes[10] = bytes[11] = (byte) 0xff;
|
|
}
|
|
|
|
return bytes;
|
|
}
|
|
|
|
/**
|
|
* Returns the {@link String} representation of an {@link InetSocketAddress}.
|
|
* <p>
|
|
* The output does not include Scope ID.
|
|
* @param addr {@link InetSocketAddress} to be converted to an address string
|
|
* @return {@code String} containing the text-formatted IP address
|
|
*/
|
|
public static String toSocketAddressString(InetSocketAddress addr) {
|
|
String port = String.valueOf(addr.getPort());
|
|
final StringBuilder sb;
|
|
|
|
if (addr.isUnresolved()) {
|
|
String hostname = getHostname(addr);
|
|
sb = newSocketAddressStringBuilder(hostname, port, !isValidIpV6Address(hostname));
|
|
} else {
|
|
InetAddress address = addr.getAddress();
|
|
String hostString = toAddressString(address);
|
|
sb = newSocketAddressStringBuilder(hostString, port, address instanceof Inet4Address);
|
|
}
|
|
return sb.append(':').append(port).toString();
|
|
}
|
|
|
|
/**
|
|
* Returns the {@link String} representation of a host port combo.
|
|
*/
|
|
public static String toSocketAddressString(String host, int port) {
|
|
String portStr = String.valueOf(port);
|
|
return newSocketAddressStringBuilder(
|
|
host, portStr, !isValidIpV6Address(host)).append(':').append(portStr).toString();
|
|
}
|
|
|
|
private static StringBuilder newSocketAddressStringBuilder(String host, String port, boolean ipv4) {
|
|
int hostLen = host.length();
|
|
if (ipv4) {
|
|
// Need to include enough space for hostString:port.
|
|
return new StringBuilder(hostLen + 1 + port.length()).append(host);
|
|
}
|
|
// Need to include enough space for [hostString]:port.
|
|
StringBuilder stringBuilder = new StringBuilder(hostLen + 3 + port.length());
|
|
if (hostLen > 1 && host.charAt(0) == '[' && host.charAt(hostLen - 1) == ']') {
|
|
return stringBuilder.append(host);
|
|
}
|
|
return stringBuilder.append('[').append(host).append(']');
|
|
}
|
|
|
|
/**
|
|
* Returns the {@link String} representation of an {@link InetAddress}.
|
|
* <ul>
|
|
* <li>Inet4Address results are identical to {@link InetAddress#getHostAddress()}</li>
|
|
* <li>Inet6Address results adhere to
|
|
* <a href="http://tools.ietf.org/html/rfc5952#section-4">rfc 5952 section 4</a></li>
|
|
* </ul>
|
|
* <p>
|
|
* The output does not include Scope ID.
|
|
* @param ip {@link InetAddress} to be converted to an address string
|
|
* @return {@code String} containing the text-formatted IP address
|
|
*/
|
|
public static String toAddressString(InetAddress ip) {
|
|
return toAddressString(ip, false);
|
|
}
|
|
|
|
/**
|
|
* Returns the {@link String} representation of an {@link InetAddress}.
|
|
* <ul>
|
|
* <li>Inet4Address results are identical to {@link InetAddress#getHostAddress()}</li>
|
|
* <li>Inet6Address results adhere to
|
|
* <a href="http://tools.ietf.org/html/rfc5952#section-4">rfc 5952 section 4</a> if
|
|
* {@code ipv4Mapped} is false. If {@code ipv4Mapped} is true then "IPv4 mapped" format
|
|
* from <a href="http://tools.ietf.org/html/rfc4291#section-2.5.5">rfc 4291 section 2</a> will be supported.
|
|
* The compressed result will always obey the compression rules defined in
|
|
* <a href="http://tools.ietf.org/html/rfc5952#section-4">rfc 5952 section 4</a></li>
|
|
* </ul>
|
|
* <p>
|
|
* The output does not include Scope ID.
|
|
* @param ip {@link InetAddress} to be converted to an address string
|
|
* @param ipv4Mapped
|
|
* <ul>
|
|
* <li>{@code true} to stray from strict rfc 5952 and support the "IPv4 mapped" format
|
|
* defined in <a href="http://tools.ietf.org/html/rfc4291#section-2.5.5">rfc 4291 section 2</a> while still
|
|
* following the updated guidelines in
|
|
* <a href="http://tools.ietf.org/html/rfc5952#section-4">rfc 5952 section 4</a></li>
|
|
* <li>{@code false} to strictly follow rfc 5952</li>
|
|
* </ul>
|
|
* @return {@code String} containing the text-formatted IP address
|
|
*/
|
|
public static String toAddressString(InetAddress ip, boolean ipv4Mapped) {
|
|
if (ip instanceof Inet4Address) {
|
|
return ip.getHostAddress();
|
|
}
|
|
if (!(ip instanceof Inet6Address)) {
|
|
throw new IllegalArgumentException("Unhandled type: " + ip);
|
|
}
|
|
|
|
return toAddressString(ip.getAddress(), 0, ipv4Mapped);
|
|
}
|
|
|
|
private static String toAddressString(byte[] bytes, int offset, boolean ipv4Mapped) {
|
|
final int[] words = new int[IPV6_WORD_COUNT];
|
|
int i;
|
|
final int end = offset + words.length;
|
|
for (i = offset; i < end; ++i) {
|
|
words[i] = ((bytes[i << 1] & 0xff) << 8) | (bytes[(i << 1) + 1] & 0xff);
|
|
}
|
|
|
|
// Find longest run of 0s, tie goes to first found instance
|
|
int currentStart = -1;
|
|
int currentLength;
|
|
int shortestStart = -1;
|
|
int shortestLength = 0;
|
|
for (i = 0; i < words.length; ++i) {
|
|
if (words[i] == 0) {
|
|
if (currentStart < 0) {
|
|
currentStart = i;
|
|
}
|
|
} else if (currentStart >= 0) {
|
|
currentLength = i - currentStart;
|
|
if (currentLength > shortestLength) {
|
|
shortestStart = currentStart;
|
|
shortestLength = currentLength;
|
|
}
|
|
currentStart = -1;
|
|
}
|
|
}
|
|
// If the array ends on a streak of zeros, make sure we account for it
|
|
if (currentStart >= 0) {
|
|
currentLength = i - currentStart;
|
|
if (currentLength > shortestLength) {
|
|
shortestStart = currentStart;
|
|
shortestLength = currentLength;
|
|
}
|
|
}
|
|
// Ignore the longest streak if it is only 1 long
|
|
if (shortestLength == 1) {
|
|
shortestLength = 0;
|
|
shortestStart = -1;
|
|
}
|
|
|
|
// Translate to string taking into account longest consecutive 0s
|
|
final int shortestEnd = shortestStart + shortestLength;
|
|
final StringBuilder b = new StringBuilder(IPV6_MAX_CHAR_COUNT);
|
|
if (shortestEnd < 0) { // Optimization when there is no compressing needed
|
|
b.append(Integer.toHexString(words[0]));
|
|
for (i = 1; i < words.length; ++i) {
|
|
b.append(':');
|
|
b.append(Integer.toHexString(words[i]));
|
|
}
|
|
} else { // General case that can handle compressing (and not compressing)
|
|
// Loop unroll the first index (so we don't constantly check i==0 cases in loop)
|
|
final boolean isIpv4Mapped;
|
|
if (inRangeEndExclusive(0, shortestStart, shortestEnd)) {
|
|
b.append("::");
|
|
isIpv4Mapped = ipv4Mapped && (shortestEnd == 5 && words[5] == 0xffff);
|
|
} else {
|
|
b.append(Integer.toHexString(words[0]));
|
|
isIpv4Mapped = false;
|
|
}
|
|
for (i = 1; i < words.length; ++i) {
|
|
if (!inRangeEndExclusive(i, shortestStart, shortestEnd)) {
|
|
if (!inRangeEndExclusive(i - 1, shortestStart, shortestEnd)) {
|
|
// If the last index was not part of the shortened sequence
|
|
if (!isIpv4Mapped || i == 6) {
|
|
b.append(':');
|
|
} else {
|
|
b.append('.');
|
|
}
|
|
}
|
|
if (isIpv4Mapped && i > 5) {
|
|
b.append(words[i] >> 8);
|
|
b.append('.');
|
|
b.append(words[i] & 0xff);
|
|
} else {
|
|
b.append(Integer.toHexString(words[i]));
|
|
}
|
|
} else if (!inRangeEndExclusive(i - 1, shortestStart, shortestEnd)) {
|
|
// If we are in the shortened sequence and the last index was not
|
|
b.append("::");
|
|
}
|
|
}
|
|
}
|
|
|
|
return b.toString();
|
|
}
|
|
|
|
/**
|
|
* Returns {@link InetSocketAddress#getHostString()} if Java >= 7,
|
|
* or {@link InetSocketAddress#getHostName()} otherwise.
|
|
* @param addr The address
|
|
* @return the host string
|
|
*/
|
|
public static String getHostname(InetSocketAddress addr) {
|
|
return PlatformDependent.javaVersion() >= 7 ? addr.getHostString() : addr.getHostName();
|
|
}
|
|
|
|
/**
|
|
* Does a range check on {@code value} if is within {@code start} (inclusive) and {@code end} (exclusive).
|
|
* @param value The value to checked if is within {@code start} (inclusive) and {@code end} (exclusive)
|
|
* @param start The start of the range (inclusive)
|
|
* @param end The end of the range (exclusive)
|
|
* @return
|
|
* <ul>
|
|
* <li>{@code true} if {@code value} if is within {@code start} (inclusive) and {@code end} (exclusive)</li>
|
|
* <li>{@code false} otherwise</li>
|
|
* </ul>
|
|
*/
|
|
private static boolean inRangeEndExclusive(int value, int start, int end) {
|
|
return value >= start && value < end;
|
|
}
|
|
|
|
/**
|
|
* A constructor to stop this class being constructed.
|
|
*/
|
|
private
|
|
NetUtil() {
|
|
// Unused
|
|
}
|
|
}
|