9583e3657e
Co-authored-by: Ron Pressler <rpressler@openjdk.org> Co-authored-by: Alan Bateman <alanb@openjdk.org> Co-authored-by: Erik Österlund <eosterlund@openjdk.org> Co-authored-by: Andrew Haley <aph@openjdk.org> Co-authored-by: Rickard Bäckman <rbackman@openjdk.org> Co-authored-by: Markus Grönlund <mgronlun@openjdk.org> Co-authored-by: Leonid Mesnik <lmesnik@openjdk.org> Co-authored-by: Serguei Spitsyn <sspitsyn@openjdk.org> Co-authored-by: Chris Plummer <cjplummer@openjdk.org> Co-authored-by: Coleen Phillimore <coleenp@openjdk.org> Co-authored-by: Robbin Ehn <rehn@openjdk.org> Co-authored-by: Stefan Karlsson <stefank@openjdk.org> Co-authored-by: Thomas Schatzl <tschatzl@openjdk.org> Co-authored-by: Sergey Kuksenko <skuksenko@openjdk.org> Reviewed-by: lancea, eosterlund, rehn, sspitsyn, stefank, tschatzl, dfuchs, lmesnik, dcubed, kevinw, amenkov, dlong, mchung, psandoz, bpb, coleenp, smarks, egahlin, mseledtsov, coffeys, darcy
1848 lines
71 KiB
Java
1848 lines
71 KiB
Java
/*
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* Copyright (c) 1995, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.net;
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import java.net.spi.InetAddressResolver;
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import java.net.spi.InetAddressResolverProvider;
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import java.net.spi.InetAddressResolver.LookupPolicy;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.List;
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import java.util.NavigableSet;
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import java.util.ArrayList;
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import java.util.Objects;
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import java.util.Scanner;
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import java.io.File;
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import java.io.ObjectStreamException;
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import java.io.ObjectStreamField;
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import java.io.IOException;
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import java.io.InvalidObjectException;
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import java.io.ObjectInputStream;
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import java.io.ObjectInputStream.GetField;
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import java.io.ObjectOutputStream;
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import java.io.ObjectOutputStream.PutField;
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import java.io.Serializable;
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import java.lang.annotation.Native;
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import java.util.ServiceLoader;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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import java.util.concurrent.ConcurrentSkipListSet;
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import java.util.concurrent.atomic.AtomicLong;
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import java.util.Arrays;
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import java.util.concurrent.locks.ReentrantLock;
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import java.util.stream.Stream;
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import jdk.internal.access.JavaNetInetAddressAccess;
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import jdk.internal.access.SharedSecrets;
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import jdk.internal.misc.Blocker;
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import jdk.internal.misc.VM;
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import jdk.internal.vm.annotation.Stable;
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import sun.net.ResolverProviderConfiguration;
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import sun.security.action.*;
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import sun.net.InetAddressCachePolicy;
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import sun.net.util.IPAddressUtil;
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import sun.nio.cs.UTF_8;
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import static java.net.spi.InetAddressResolver.LookupPolicy.IPV4;
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import static java.net.spi.InetAddressResolver.LookupPolicy.IPV4_FIRST;
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import static java.net.spi.InetAddressResolver.LookupPolicy.IPV6;
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import static java.net.spi.InetAddressResolver.LookupPolicy.IPV6_FIRST;
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/**
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* This class represents an Internet Protocol (IP) address.
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*
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* <p> An IP address is either a 32-bit or 128-bit unsigned number
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* used by IP, a lower-level protocol on which protocols like UDP and
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* TCP are built. The IP address architecture is defined by <a
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* href="http://www.ietf.org/rfc/rfc790.txt"><i>RFC 790:
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* Assigned Numbers</i></a>, <a
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* href="http://www.ietf.org/rfc/rfc1918.txt"> <i>RFC 1918:
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* Address Allocation for Private Internets</i></a>, <a
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* href="http://www.ietf.org/rfc/rfc2365.txt"><i>RFC 2365:
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* Administratively Scoped IP Multicast</i></a>, and <a
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* href="http://www.ietf.org/rfc/rfc2373.txt"><i>RFC 2373: IP
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* Version 6 Addressing Architecture</i></a>. An instance of an
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* InetAddress consists of an IP address and possibly its
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* corresponding host name (depending on whether it is constructed
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* with a host name or whether it has already done reverse host name
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* resolution).
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*
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* <h2> Address types </h2>
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*
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* <table class="striped" style="margin-left:2em">
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* <caption style="display:none">Description of unicast and multicast address types</caption>
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* <thead>
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* <tr><th scope="col">Address Type</th><th scope="col">Description</th></tr>
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* </thead>
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* <tbody>
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* <tr><th scope="row" style="vertical-align:top">unicast</th>
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* <td>An identifier for a single interface. A packet sent to
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* a unicast address is delivered to the interface identified by
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* that address.
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*
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* <p> The Unspecified Address -- Also called anylocal or wildcard
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* address. It must never be assigned to any node. It indicates the
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* absence of an address. One example of its use is as the target of
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* bind, which allows a server to accept a client connection on any
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* interface, in case the server host has multiple interfaces.
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*
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* <p> The <i>unspecified</i> address must not be used as
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* the destination address of an IP packet.
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*
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* <p> The <i>Loopback</i> Addresses -- This is the address
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* assigned to the loopback interface. Anything sent to this
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* IP address loops around and becomes IP input on the local
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* host. This address is often used when testing a
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* client.</td></tr>
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* <tr><th scope="row" style="vertical-align:top">multicast</th>
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* <td>An identifier for a set of interfaces (typically belonging
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* to different nodes). A packet sent to a multicast address is
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* delivered to all interfaces identified by that address.</td></tr>
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* </tbody>
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* </table>
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*
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* <h3> IP address scope </h3>
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*
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* <p> <i>Link-local</i> addresses are designed to be used for addressing
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* on a single link for purposes such as auto-address configuration,
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* neighbor discovery, or when no routers are present.
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*
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* <p> <i>Site-local</i> addresses are designed to be used for addressing
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* inside of a site without the need for a global prefix.
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*
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* <p> <i>Global</i> addresses are unique across the internet.
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*
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* <h3> Textual representation of IP addresses </h3>
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*
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* The textual representation of an IP address is address family specific.
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*
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* <p>
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*
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* For IPv4 address format, please refer to <A
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* HREF="Inet4Address.html#format">Inet4Address#format</A>; For IPv6
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* address format, please refer to <A
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* HREF="Inet6Address.html#format">Inet6Address#format</A>.
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*
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* <p> There is a <a href="doc-files/net-properties.html#Ipv4IPv6">couple of
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* System Properties</a> affecting how IPv4 and IPv6 addresses are used.
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*
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* <h2 id="host-name-resolution"> Host Name Resolution </h2>
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*
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* <p> The InetAddress class provides methods to resolve host names to
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* their IP addresses and vice versa. The actual resolution is delegated to an
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* {@linkplain InetAddressResolver InetAddress resolver}.
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*
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* <p> <i>Host name-to-IP address resolution</i> maps a host name to an IP address.
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* For any host name, its corresponding IP address is returned.
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*
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* <p> <i>Reverse name resolution</i> means that for any IP address,
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* the host associated with the IP address is returned.
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*
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* <p id="built-in-resolver"> The built-in InetAddress resolver implementation does
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* host name-to-IP address resolution and vice versa through the use of
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* a combination of local machine configuration information and network
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* naming services such as the Domain Name System (DNS) and the Lightweight Directory
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* Access Protocol (LDAP).
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* The particular naming services that the built-in resolver uses by default
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* depends on the configuration of the local machine.
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*
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* <p> {@code InetAddress} has a service provider mechanism for InetAddress resolvers
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* that allows a custom InetAddress resolver to be used instead of the built-in implementation.
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* {@link InetAddressResolverProvider} is the service provider class. Its API docs provide all the
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* details on this mechanism.
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*
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* <h2> InetAddress Caching </h2>
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*
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* The InetAddress class has a cache to store successful as well as
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* unsuccessful host name resolutions.
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*
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* <p> By default, when a security manager is installed, in order to
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* protect against DNS spoofing attacks,
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* the result of positive host name resolutions are
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* cached forever. When a security manager is not installed, the default
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* behavior is to cache entries for a finite (implementation dependent)
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* period of time. The result of unsuccessful host
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* name resolution is cached for a very short period of time (10
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* seconds) to improve performance.
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*
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* <p> If the default behavior is not desired, then a Java security property
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* can be set to a different Time-to-live (TTL) value for positive
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* caching. Likewise, a system admin can configure a different
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* negative caching TTL value when needed.
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*
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* <p> Two Java security properties control the TTL values used for
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* positive and negative host name resolution caching:
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*
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* <dl style="margin-left:2em">
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* <dt><b>networkaddress.cache.ttl</b></dt>
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* <dd>Indicates the caching policy for successful name lookups from
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* the name service. The value is specified as an integer to indicate
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* the number of seconds to cache the successful lookup. The default
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* setting is to cache for an implementation specific period of time.
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* <p>
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* A value of -1 indicates "cache forever".
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* </dd>
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* <dt><b>networkaddress.cache.negative.ttl</b> (default: 10)</dt>
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* <dd>Indicates the caching policy for un-successful name lookups
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* from the name service. The value is specified as an integer to
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* indicate the number of seconds to cache the failure for
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* un-successful lookups.
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* <p>
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* A value of 0 indicates "never cache".
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* A value of -1 indicates "cache forever".
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* </dd>
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* </dl>
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*
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* @author Chris Warth
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* @see java.net.InetAddress#getByAddress(byte[])
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* @see java.net.InetAddress#getByAddress(java.lang.String, byte[])
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* @see java.net.InetAddress#getAllByName(java.lang.String)
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* @see java.net.InetAddress#getByName(java.lang.String)
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* @see java.net.InetAddress#getLocalHost()
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* @since 1.0
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*/
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public sealed class InetAddress implements Serializable permits Inet4Address, Inet6Address {
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/**
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* Specify the address family: Internet Protocol, Version 4
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* @since 1.4
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*/
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@Native static final int IPv4 = 1;
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/**
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* Specify the address family: Internet Protocol, Version 6
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* @since 1.4
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*/
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@Native static final int IPv6 = 2;
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static class InetAddressHolder {
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/**
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* Reserve the original application specified hostname.
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*
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* The original hostname is useful for domain-based endpoint
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* identification (see RFC 2818 and RFC 6125). If an address
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* was created with a raw IP address, a reverse name lookup
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* may introduce endpoint identification security issue via
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* DNS forging.
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*
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* Oracle JSSE provider is using this original hostname, via
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* jdk.internal.misc.JavaNetAccess, for SSL/TLS endpoint identification.
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*
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* Note: May define a new public method in the future if necessary.
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*/
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String originalHostName;
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InetAddressHolder() {}
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InetAddressHolder(String hostName, int address, int family) {
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this.originalHostName = hostName;
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this.hostName = hostName;
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this.address = address;
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this.family = family;
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}
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void init(String hostName, int family) {
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this.originalHostName = hostName;
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this.hostName = hostName;
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if (family != -1) {
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this.family = family;
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}
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}
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String hostName;
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String getHostName() {
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return hostName;
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}
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String getOriginalHostName() {
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return originalHostName;
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}
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/**
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* Holds a 32-bit IPv4 address.
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*/
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int address;
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int getAddress() {
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return address;
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}
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/**
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* Specifies the address family type, for instance, '1' for IPv4
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* addresses, and '2' for IPv6 addresses.
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*/
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int family;
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int getFamily() {
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return family;
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}
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}
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/* Used to store the serializable fields of InetAddress */
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final transient InetAddressHolder holder;
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InetAddressHolder holder() {
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return holder;
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}
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/* Used to store the system-wide resolver */
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@Stable
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private static volatile InetAddressResolver resolver;
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private static final InetAddressResolver BUILTIN_RESOLVER;
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/**
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* Used to store the best available hostname.
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* Lazily initialized via a data race; safe because Strings are immutable.
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*/
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private transient String canonicalHostName = null;
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/** use serialVersionUID from JDK 1.0.2 for interoperability */
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@java.io.Serial
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private static final long serialVersionUID = 3286316764910316507L;
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// "java.net.preferIPv4Stack" system property value
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private static final String PREFER_IPV4_STACK_VALUE;
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// "java.net.preferIPv6Addresses" system property value
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private static final String PREFER_IPV6_ADDRESSES_VALUE;
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// "jdk.net.hosts.file" system property value
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private static final String HOSTS_FILE_NAME;
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/*
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* Load net library into runtime, and perform initializations.
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*/
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static {
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PREFER_IPV4_STACK_VALUE =
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GetPropertyAction.privilegedGetProperty("java.net.preferIPv4Stack");
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PREFER_IPV6_ADDRESSES_VALUE =
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GetPropertyAction.privilegedGetProperty("java.net.preferIPv6Addresses");
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HOSTS_FILE_NAME =
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GetPropertyAction.privilegedGetProperty("jdk.net.hosts.file");
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jdk.internal.loader.BootLoader.loadLibrary("net");
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SharedSecrets.setJavaNetInetAddressAccess(
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new JavaNetInetAddressAccess() {
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public String getOriginalHostName(InetAddress ia) {
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return ia.holder.getOriginalHostName();
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}
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public int addressValue(Inet4Address inet4Address) {
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return inet4Address.addressValue();
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}
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public byte[] addressBytes(Inet6Address inet6Address) {
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return inet6Address.addressBytes();
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}
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}
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);
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init();
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}
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/**
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* Creates an address lookup policy from {@code "java.net.preferIPv4Stack"},
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* {@code "java.net.preferIPv6Addresses"} system property values, and O/S configuration.
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*/
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private static final LookupPolicy initializePlatformLookupPolicy() {
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// Calculate AddressFamily value first
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boolean ipv4Available = isIPv4Available();
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if ("true".equals(PREFER_IPV4_STACK_VALUE) && ipv4Available) {
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return LookupPolicy.of(IPV4);
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}
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// Check if IPv6 is not supported
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if (InetAddress.impl instanceof Inet4AddressImpl) {
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return LookupPolicy.of(IPV4);
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}
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// Check if system supports IPv4, if not use IPv6
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if (!ipv4Available) {
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return LookupPolicy.of(IPV6);
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}
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// If both address families are needed - check preferIPv6Addresses value
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if (PREFER_IPV6_ADDRESSES_VALUE != null) {
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if (PREFER_IPV6_ADDRESSES_VALUE.equalsIgnoreCase("true")) {
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return LookupPolicy.of(IPV4 | IPV6 | IPV6_FIRST);
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}
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if (PREFER_IPV6_ADDRESSES_VALUE.equalsIgnoreCase("false")) {
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return LookupPolicy.of(IPV4 | IPV6 | IPV4_FIRST);
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}
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if (PREFER_IPV6_ADDRESSES_VALUE.equalsIgnoreCase("system")) {
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return LookupPolicy.of(IPV4 | IPV6);
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}
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}
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// Default value with both address families needed - IPv4 addresses come first
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return LookupPolicy.of(IPV4 | IPV6 | IPV4_FIRST);
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}
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static boolean systemAddressesOrder(int lookupCharacteristics) {
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return (lookupCharacteristics & (IPV4_FIRST | IPV6_FIRST)) == 0;
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}
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static boolean ipv4AddressesFirst(int lookupCharacteristics) {
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return (lookupCharacteristics & IPV4_FIRST) != 0;
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}
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static boolean ipv6AddressesFirst(int lookupCharacteristics) {
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return (lookupCharacteristics & IPV6_FIRST) != 0;
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}
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// Native method to check if IPv4 is available
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private static native boolean isIPv4Available();
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// Native method to check if IPv6 is available
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private static native boolean isIPv6Supported();
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|
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/**
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* The {@code RuntimePermission("inetAddressResolverProvider")} is
|
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* necessary to subclass and instantiate the {@code InetAddressResolverProvider}
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* class, as well as to obtain resolver from an instance of that class,
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* and it is also required to obtain the operating system name resolution configurations.
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*/
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private static final RuntimePermission INET_ADDRESS_RESOLVER_PERMISSION =
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new RuntimePermission("inetAddressResolverProvider");
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private static final ReentrantLock RESOLVER_LOCK = new ReentrantLock();
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private static volatile InetAddressResolver bootstrapResolver;
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|
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@SuppressWarnings("removal")
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private static InetAddressResolver resolver() {
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InetAddressResolver cns = resolver;
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if (cns != null) {
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return cns;
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}
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if (VM.isBooted()) {
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RESOLVER_LOCK.lock();
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boolean bootstrapSet = false;
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try {
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cns = resolver;
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if (cns != null) {
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return cns;
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}
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// Protection against provider calling InetAddress APIs during initialization
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if (bootstrapResolver != null) {
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return bootstrapResolver;
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}
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bootstrapResolver = BUILTIN_RESOLVER;
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bootstrapSet = true;
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if (HOSTS_FILE_NAME != null) {
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// The default resolver service is already host file resolver
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cns = BUILTIN_RESOLVER;
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} else if (System.getSecurityManager() != null) {
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PrivilegedAction<InetAddressResolver> pa = InetAddress::loadResolver;
|
|
cns = AccessController.doPrivileged(
|
|
pa, null, INET_ADDRESS_RESOLVER_PERMISSION);
|
|
} else {
|
|
cns = loadResolver();
|
|
}
|
|
|
|
InetAddress.resolver = cns;
|
|
return cns;
|
|
} finally {
|
|
// We want to clear bootstrap resolver reference only after an attempt to
|
|
// instantiate a resolver has been completed.
|
|
if (bootstrapSet) {
|
|
bootstrapResolver = null;
|
|
}
|
|
RESOLVER_LOCK.unlock();
|
|
}
|
|
} else {
|
|
return BUILTIN_RESOLVER;
|
|
}
|
|
}
|
|
|
|
private static InetAddressResolver loadResolver() {
|
|
return ServiceLoader.load(InetAddressResolverProvider.class)
|
|
.findFirst()
|
|
.map(nsp -> nsp.get(builtinConfiguration()))
|
|
.orElse(BUILTIN_RESOLVER);
|
|
}
|
|
|
|
private static InetAddressResolverProvider.Configuration builtinConfiguration() {
|
|
return new ResolverProviderConfiguration(BUILTIN_RESOLVER, () -> {
|
|
try {
|
|
return impl.getLocalHostName();
|
|
} catch (UnknownHostException unknownHostException) {
|
|
return "localhost";
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Constructor for the Socket.accept() method.
|
|
* This creates an empty InetAddress, which is filled in by
|
|
* the accept() method. This InetAddress, however, is not
|
|
* put in the address cache, since it is not created by name.
|
|
*/
|
|
InetAddress() {
|
|
holder = new InetAddressHolder();
|
|
}
|
|
|
|
/**
|
|
* Replaces the de-serialized object with an Inet4Address object.
|
|
*
|
|
* @return the alternate object to the de-serialized object.
|
|
*
|
|
* @throws ObjectStreamException if a new object replacing this
|
|
* object could not be created
|
|
*/
|
|
@java.io.Serial
|
|
private Object readResolve() throws ObjectStreamException {
|
|
// will replace the deserialized 'this' object
|
|
return new Inet4Address(holder().getHostName(), holder().getAddress());
|
|
}
|
|
|
|
/**
|
|
* Utility routine to check if the InetAddress is an
|
|
* IP multicast address.
|
|
* @return a {@code boolean} indicating if the InetAddress is
|
|
* an IP multicast address
|
|
* @since 1.1
|
|
*/
|
|
public boolean isMulticastAddress() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Utility routine to check if the InetAddress is a wildcard address.
|
|
* @return a {@code boolean} indicating if the InetAddress is
|
|
* a wildcard address.
|
|
* @since 1.4
|
|
*/
|
|
public boolean isAnyLocalAddress() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Utility routine to check if the InetAddress is a loopback address.
|
|
*
|
|
* @return a {@code boolean} indicating if the InetAddress is
|
|
* a loopback address; or false otherwise.
|
|
* @since 1.4
|
|
*/
|
|
public boolean isLoopbackAddress() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Utility routine to check if the InetAddress is a link local address.
|
|
*
|
|
* @return a {@code boolean} indicating if the InetAddress is
|
|
* a link local address; or false if address is not a link local unicast address.
|
|
* @since 1.4
|
|
*/
|
|
public boolean isLinkLocalAddress() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Utility routine to check if the InetAddress is a site local address.
|
|
*
|
|
* @return a {@code boolean} indicating if the InetAddress is
|
|
* a site local address; or false if address is not a site local unicast address.
|
|
* @since 1.4
|
|
*/
|
|
public boolean isSiteLocalAddress() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Utility routine to check if the multicast address has global scope.
|
|
*
|
|
* @return a {@code boolean} indicating if the address has
|
|
* is a multicast address of global scope, false if it is not
|
|
* of global scope or it is not a multicast address
|
|
* @since 1.4
|
|
*/
|
|
public boolean isMCGlobal() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Utility routine to check if the multicast address has node scope.
|
|
*
|
|
* @return a {@code boolean} indicating if the address has
|
|
* is a multicast address of node-local scope, false if it is not
|
|
* of node-local scope or it is not a multicast address
|
|
* @since 1.4
|
|
*/
|
|
public boolean isMCNodeLocal() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Utility routine to check if the multicast address has link scope.
|
|
*
|
|
* @return a {@code boolean} indicating if the address has
|
|
* is a multicast address of link-local scope, false if it is not
|
|
* of link-local scope or it is not a multicast address
|
|
* @since 1.4
|
|
*/
|
|
public boolean isMCLinkLocal() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Utility routine to check if the multicast address has site scope.
|
|
*
|
|
* @return a {@code boolean} indicating if the address has
|
|
* is a multicast address of site-local scope, false if it is not
|
|
* of site-local scope or it is not a multicast address
|
|
* @since 1.4
|
|
*/
|
|
public boolean isMCSiteLocal() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Utility routine to check if the multicast address has organization scope.
|
|
*
|
|
* @return a {@code boolean} indicating if the address has
|
|
* is a multicast address of organization-local scope,
|
|
* false if it is not of organization-local scope
|
|
* or it is not a multicast address
|
|
* @since 1.4
|
|
*/
|
|
public boolean isMCOrgLocal() {
|
|
return false;
|
|
}
|
|
|
|
|
|
/**
|
|
* Test whether that address is reachable. Best effort is made by the
|
|
* implementation to try to reach the host, but firewalls and server
|
|
* configuration may block requests resulting in an unreachable status
|
|
* while some specific ports may be accessible.
|
|
* A typical implementation will use ICMP ECHO REQUESTs if the
|
|
* privilege can be obtained, otherwise it will try to establish
|
|
* a TCP connection on port 7 (Echo) of the destination host.
|
|
* <p>
|
|
* The timeout value, in milliseconds, indicates the maximum amount of time
|
|
* the try should take. If the operation times out before getting an
|
|
* answer, the host is deemed unreachable. A negative value will result
|
|
* in an IllegalArgumentException being thrown.
|
|
*
|
|
* @param timeout the time, in milliseconds, before the call aborts
|
|
* @return a {@code boolean} indicating if the address is reachable.
|
|
* @throws IOException if a network error occurs
|
|
* @throws IllegalArgumentException if {@code timeout} is negative.
|
|
* @since 1.5
|
|
*/
|
|
public boolean isReachable(int timeout) throws IOException {
|
|
return isReachable(null, 0 , timeout);
|
|
}
|
|
|
|
/**
|
|
* Test whether that address is reachable. Best effort is made by the
|
|
* implementation to try to reach the host, but firewalls and server
|
|
* configuration may block requests resulting in a unreachable status
|
|
* while some specific ports may be accessible.
|
|
* A typical implementation will use ICMP ECHO REQUESTs if the
|
|
* privilege can be obtained, otherwise it will try to establish
|
|
* a TCP connection on port 7 (Echo) of the destination host.
|
|
* <p>
|
|
* The {@code network interface} and {@code ttl} parameters
|
|
* let the caller specify which network interface the test will go through
|
|
* and the maximum number of hops the packets should go through.
|
|
* A negative value for the {@code ttl} will result in an
|
|
* IllegalArgumentException being thrown.
|
|
* <p>
|
|
* The timeout value, in milliseconds, indicates the maximum amount of time
|
|
* the try should take. If the operation times out before getting an
|
|
* answer, the host is deemed unreachable. A negative value will result
|
|
* in an IllegalArgumentException being thrown.
|
|
*
|
|
* @param netif the NetworkInterface through which the
|
|
* test will be done, or null for any interface
|
|
* @param ttl the maximum numbers of hops to try or 0 for the
|
|
* default
|
|
* @param timeout the time, in milliseconds, before the call aborts
|
|
* @throws IllegalArgumentException if either {@code timeout}
|
|
* or {@code ttl} are negative.
|
|
* @return a {@code boolean} indicating if the address is reachable.
|
|
* @throws IOException if a network error occurs
|
|
* @since 1.5
|
|
*/
|
|
public boolean isReachable(NetworkInterface netif, int ttl,
|
|
int timeout) throws IOException {
|
|
if (ttl < 0)
|
|
throw new IllegalArgumentException("ttl can't be negative");
|
|
if (timeout < 0)
|
|
throw new IllegalArgumentException("timeout can't be negative");
|
|
|
|
return impl.isReachable(this, timeout, netif, ttl);
|
|
}
|
|
|
|
/**
|
|
* Gets the host name for this IP address.
|
|
*
|
|
* <p>If this InetAddress was created with a host name,
|
|
* this host name will be remembered and returned;
|
|
* otherwise, a reverse name lookup will be performed
|
|
* and the result will be returned based on the system
|
|
* configured resolver. If a lookup of the name service
|
|
* is required, call
|
|
* {@link #getCanonicalHostName() getCanonicalHostName}.
|
|
*
|
|
* <p>If there is a security manager, its
|
|
* {@code checkConnect} method is first called
|
|
* with the hostname and {@code -1}
|
|
* as its arguments to see if the operation is allowed.
|
|
* If the operation is not allowed, it will return
|
|
* the textual representation of the IP address.
|
|
*
|
|
* @return the host name for this IP address, or if the operation
|
|
* is not allowed by the security check, the textual
|
|
* representation of the IP address.
|
|
*
|
|
* @see InetAddress#getCanonicalHostName
|
|
* @see SecurityManager#checkConnect
|
|
*/
|
|
public String getHostName() {
|
|
return getHostName(true);
|
|
}
|
|
|
|
/**
|
|
* Returns the hostname for this address.
|
|
* If the host is equal to null, then this address refers to any
|
|
* of the local machine's available network addresses.
|
|
* this is package private so SocketPermission can make calls into
|
|
* here without a security check.
|
|
*
|
|
* <p>If there is a security manager, this method first
|
|
* calls its {@code checkConnect} method
|
|
* with the hostname and {@code -1}
|
|
* as its arguments to see if the calling code is allowed to know
|
|
* the hostname for this IP address, i.e., to connect to the host.
|
|
* If the operation is not allowed, it will return
|
|
* the textual representation of the IP address.
|
|
*
|
|
* @return the host name for this IP address, or if the operation
|
|
* is not allowed by the security check, the textual
|
|
* representation of the IP address.
|
|
*
|
|
* @param check make security check if true
|
|
*
|
|
* @see SecurityManager#checkConnect
|
|
*/
|
|
String getHostName(boolean check) {
|
|
if (holder().getHostName() == null) {
|
|
holder().hostName = InetAddress.getHostFromNameService(this, check);
|
|
}
|
|
return holder().getHostName();
|
|
}
|
|
|
|
/**
|
|
* Gets the fully qualified domain name for this IP address.
|
|
* Best effort method, meaning we may not be able to return
|
|
* the FQDN depending on the underlying system configuration.
|
|
*
|
|
* <p>If there is a security manager, this method first
|
|
* calls its {@code checkConnect} method
|
|
* with the hostname and {@code -1}
|
|
* as its arguments to see if the calling code is allowed to know
|
|
* the hostname for this IP address, i.e., to connect to the host.
|
|
* If the operation is not allowed, it will return
|
|
* the textual representation of the IP address.
|
|
*
|
|
* @return the fully qualified domain name for this IP address,
|
|
* or if the operation is not allowed by the security check,
|
|
* the textual representation of the IP address.
|
|
*
|
|
* @see SecurityManager#checkConnect
|
|
*
|
|
* @since 1.4
|
|
*/
|
|
public String getCanonicalHostName() {
|
|
String value = canonicalHostName;
|
|
if (value == null)
|
|
canonicalHostName = value =
|
|
InetAddress.getHostFromNameService(this, true);
|
|
return value;
|
|
}
|
|
|
|
/**
|
|
* Returns the hostname for this address.
|
|
*
|
|
* <p>If there is a security manager, this method first
|
|
* calls its {@code checkConnect} method
|
|
* with the hostname and {@code -1}
|
|
* as its arguments to see if the calling code is allowed to know
|
|
* the hostname for this IP address, i.e., to connect to the host.
|
|
* If the operation is not allowed, it will return
|
|
* the textual representation of the IP address.
|
|
*
|
|
* @return the host name for this IP address, or if the operation
|
|
* is not allowed by the security check, the textual
|
|
* representation of the IP address.
|
|
*
|
|
* @param check make security check if true
|
|
*
|
|
* @see SecurityManager#checkConnect
|
|
*/
|
|
private static String getHostFromNameService(InetAddress addr, boolean check) {
|
|
String host;
|
|
var resolver = resolver();
|
|
try {
|
|
// first lookup the hostname
|
|
host = resolver.lookupByAddress(addr.getAddress());
|
|
|
|
/* check to see if calling code is allowed to know
|
|
* the hostname for this IP address, ie, connect to the host
|
|
*/
|
|
if (check) {
|
|
@SuppressWarnings("removal")
|
|
SecurityManager sec = System.getSecurityManager();
|
|
if (sec != null) {
|
|
sec.checkConnect(host, -1);
|
|
}
|
|
}
|
|
|
|
/* now get all the IP addresses for this hostname,
|
|
* and make sure one of them matches the original IP
|
|
* address. We do this to try and prevent spoofing.
|
|
*/
|
|
|
|
InetAddress[] arr = InetAddress.getAllByName0(host, check);
|
|
boolean ok = false;
|
|
|
|
if (arr != null) {
|
|
for (int i = 0; !ok && i < arr.length; i++) {
|
|
ok = addr.equals(arr[i]);
|
|
}
|
|
}
|
|
|
|
//XXX: if it looks like a spoof just return the address?
|
|
if (!ok) {
|
|
host = addr.getHostAddress();
|
|
return host;
|
|
}
|
|
} catch (RuntimeException | UnknownHostException e) {
|
|
// 'resolver.lookupByAddress' and 'InetAddress.getAllByName0' delegate to
|
|
// the system-wide resolver, which could be a custom one. At that point we
|
|
// treat any unexpected RuntimeException thrown by the resolver as we would
|
|
// treat an UnknownHostException or an unmatched host name.
|
|
host = addr.getHostAddress();
|
|
}
|
|
return host;
|
|
}
|
|
|
|
/**
|
|
* Returns the raw IP address of this {@code InetAddress}
|
|
* object. The result is in network byte order: the highest order
|
|
* byte of the address is in {@code getAddress()[0]}.
|
|
*
|
|
* @return the raw IP address of this object.
|
|
*/
|
|
public byte[] getAddress() {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Returns the IP address string in textual presentation.
|
|
*
|
|
* @return the raw IP address in a string format.
|
|
* @since 1.0.2
|
|
*/
|
|
public String getHostAddress() {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Returns a hashcode for this IP address.
|
|
*
|
|
* @return a hash code value for this IP address.
|
|
*/
|
|
public int hashCode() {
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* Compares this object against the specified object.
|
|
* The result is {@code true} if and only if the argument is
|
|
* not {@code null} and it represents the same IP address as
|
|
* this object.
|
|
* <p>
|
|
* Two instances of {@code InetAddress} represent the same IP
|
|
* address if the length of the byte arrays returned by
|
|
* {@code getAddress} is the same for both, and each of the
|
|
* array components is the same for the byte arrays.
|
|
*
|
|
* @param obj the object to compare against.
|
|
* @return {@code true} if the objects are the same;
|
|
* {@code false} otherwise.
|
|
* @see java.net.InetAddress#getAddress()
|
|
*/
|
|
public boolean equals(Object obj) {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Converts this IP address to a {@code String}. The
|
|
* string returned is of the form: hostname / literal IP
|
|
* address.
|
|
*
|
|
* If the host name is unresolved, no reverse lookup
|
|
* is performed. The hostname part will be represented
|
|
* by an empty string.
|
|
*
|
|
* @return a string representation of this IP address.
|
|
*/
|
|
public String toString() {
|
|
String hostName = holder().getHostName();
|
|
return Objects.toString(hostName, "")
|
|
+ "/" + getHostAddress();
|
|
}
|
|
|
|
// mapping from host name to Addresses - either NameServiceAddresses (while
|
|
// still being looked-up by NameService(s)) or CachedAddresses when cached
|
|
private static final ConcurrentMap<String, Addresses> cache =
|
|
new ConcurrentHashMap<>();
|
|
|
|
// CachedAddresses that have to expire are kept ordered in this NavigableSet
|
|
// which is scanned on each access
|
|
private static final NavigableSet<CachedAddresses> expirySet =
|
|
new ConcurrentSkipListSet<>();
|
|
|
|
// common interface
|
|
private interface Addresses {
|
|
InetAddress[] get() throws UnknownHostException;
|
|
}
|
|
|
|
// a holder for cached addresses with required metadata
|
|
private static final class CachedAddresses implements Addresses, Comparable<CachedAddresses> {
|
|
private static final AtomicLong seq = new AtomicLong();
|
|
final String host;
|
|
final InetAddress[] inetAddresses;
|
|
final long expiryTime; // time of expiry (in terms of System.nanoTime())
|
|
final long id = seq.incrementAndGet(); // each instance is unique
|
|
|
|
CachedAddresses(String host, InetAddress[] inetAddresses, long expiryTime) {
|
|
this.host = host;
|
|
this.inetAddresses = inetAddresses;
|
|
this.expiryTime = expiryTime;
|
|
}
|
|
|
|
@Override
|
|
public InetAddress[] get() throws UnknownHostException {
|
|
if (inetAddresses == null) {
|
|
throw new UnknownHostException(host);
|
|
}
|
|
return inetAddresses;
|
|
}
|
|
|
|
@Override
|
|
public int compareTo(CachedAddresses other) {
|
|
// natural order is expiry time -
|
|
// compare difference of expiry times rather than
|
|
// expiry times directly, to avoid possible overflow.
|
|
// (see System.nanoTime() recommendations...)
|
|
long diff = this.expiryTime - other.expiryTime;
|
|
if (diff < 0L) return -1;
|
|
if (diff > 0L) return 1;
|
|
// ties are broken using unique id
|
|
return Long.compare(this.id, other.id);
|
|
}
|
|
}
|
|
|
|
// a name service lookup based Addresses implementation which replaces itself
|
|
// in cache when the result is obtained
|
|
private static final class NameServiceAddresses implements Addresses {
|
|
private final String host;
|
|
private final ReentrantLock lookupLock = new ReentrantLock();
|
|
|
|
NameServiceAddresses(String host) {
|
|
this.host = host;
|
|
}
|
|
|
|
@Override
|
|
public InetAddress[] get() throws UnknownHostException {
|
|
Addresses addresses;
|
|
// only one thread is doing lookup to name service
|
|
// for particular host at any time.
|
|
lookupLock.lock();
|
|
try {
|
|
// re-check that we are still us + re-install us if slot empty
|
|
addresses = cache.putIfAbsent(host, this);
|
|
if (addresses == null) {
|
|
// this can happen when we were replaced by CachedAddresses in
|
|
// some other thread, then CachedAddresses expired and were
|
|
// removed from cache while we were waiting for lock...
|
|
addresses = this;
|
|
}
|
|
// still us ?
|
|
if (addresses == this) {
|
|
// lookup name services
|
|
InetAddress[] inetAddresses;
|
|
UnknownHostException ex;
|
|
int cachePolicy;
|
|
try {
|
|
inetAddresses = getAddressesFromNameService(host);
|
|
ex = null;
|
|
cachePolicy = InetAddressCachePolicy.get();
|
|
} catch (UnknownHostException uhe) {
|
|
inetAddresses = null;
|
|
ex = uhe;
|
|
cachePolicy = InetAddressCachePolicy.getNegative();
|
|
}
|
|
// remove or replace us with cached addresses according to cachePolicy
|
|
if (cachePolicy == InetAddressCachePolicy.NEVER) {
|
|
cache.remove(host, this);
|
|
} else {
|
|
CachedAddresses cachedAddresses = new CachedAddresses(
|
|
host,
|
|
inetAddresses,
|
|
cachePolicy == InetAddressCachePolicy.FOREVER
|
|
? 0L
|
|
// cachePolicy is in [s] - we need [ns]
|
|
: System.nanoTime() + 1000_000_000L * cachePolicy
|
|
);
|
|
if (cache.replace(host, this, cachedAddresses) &&
|
|
cachePolicy != InetAddressCachePolicy.FOREVER) {
|
|
// schedule expiry
|
|
expirySet.add(cachedAddresses);
|
|
}
|
|
}
|
|
if (inetAddresses == null || inetAddresses.length == 0) {
|
|
throw ex == null ? new UnknownHostException(host) : ex;
|
|
}
|
|
return inetAddresses;
|
|
}
|
|
// else addresses != this
|
|
} finally {
|
|
lookupLock.unlock();
|
|
}
|
|
// delegate to different addresses when we are already replaced
|
|
// but outside of synchronized block to avoid any chance of dead-locking
|
|
return addresses.get();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The default InetAddressResolver implementation, which delegates to the underlying
|
|
* OS network libraries to resolve host address mappings.
|
|
*
|
|
* @since 9
|
|
*/
|
|
private static final class PlatformResolver implements InetAddressResolver {
|
|
|
|
public Stream<InetAddress> lookupByName(String host, LookupPolicy policy)
|
|
throws UnknownHostException {
|
|
Objects.requireNonNull(host);
|
|
Objects.requireNonNull(policy);
|
|
InetAddress[] addrs;
|
|
long comp = Blocker.begin();
|
|
try {
|
|
addrs = impl.lookupAllHostAddr(host, policy);
|
|
} finally {
|
|
Blocker.end(comp);
|
|
}
|
|
return Arrays.stream(addrs);
|
|
}
|
|
|
|
public String lookupByAddress(byte[] addr) throws UnknownHostException {
|
|
Objects.requireNonNull(addr);
|
|
if (addr.length != Inet4Address.INADDRSZ && addr.length != Inet6Address.INADDRSZ) {
|
|
throw new IllegalArgumentException("Invalid address length");
|
|
}
|
|
long comp = Blocker.begin();
|
|
try {
|
|
return impl.getHostByAddr(addr);
|
|
} finally {
|
|
Blocker.end(comp);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The HostsFileResolver provides host address mapping
|
|
* by reading the entries in a hosts file, which is specified by
|
|
* {@code jdk.net.hosts.file} system property
|
|
*
|
|
* <p>The file format is that which corresponds with the /etc/hosts file
|
|
* IP Address host alias list.
|
|
*
|
|
* <p>When the file lookup is enabled it replaces the default InetAddressResolver
|
|
* implementation
|
|
*
|
|
* @since 9
|
|
*/
|
|
private static final class HostsFileResolver implements InetAddressResolver {
|
|
|
|
private final String hostsFile;
|
|
|
|
public HostsFileResolver(String hostsFileName) {
|
|
this.hostsFile = hostsFileName;
|
|
}
|
|
|
|
/**
|
|
* Lookup the host name corresponding to the IP address provided.
|
|
* Search the configured host file a host name corresponding to
|
|
* the specified IP address.
|
|
*
|
|
* @param addr byte array representing an IP address
|
|
* @return {@code String} representing the host name mapping
|
|
* @throws UnknownHostException if no host found for the specified IP address
|
|
* @throws IllegalArgumentException if IP address is of illegal length
|
|
* @throws NullPointerException if addr is {@code null}
|
|
*/
|
|
@Override
|
|
public String lookupByAddress(byte[] addr) throws UnknownHostException {
|
|
String hostEntry;
|
|
String host = null;
|
|
Objects.requireNonNull(addr);
|
|
// Check the length of the address array
|
|
if (addr.length != Inet4Address.INADDRSZ && addr.length != Inet6Address.INADDRSZ) {
|
|
throw new IllegalArgumentException("Invalid address length");
|
|
}
|
|
|
|
try (Scanner hostsFileScanner = new Scanner(new File(hostsFile),
|
|
UTF_8.INSTANCE)) {
|
|
while (hostsFileScanner.hasNextLine()) {
|
|
hostEntry = hostsFileScanner.nextLine();
|
|
if (!hostEntry.startsWith("#")) {
|
|
hostEntry = removeComments(hostEntry);
|
|
String[] mapping = hostEntry.split("\\s+");
|
|
if (mapping.length >= 2 &&
|
|
Arrays.equals(addr, createAddressByteArray(mapping[0]))) {
|
|
host = mapping[1];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
} catch (IOException e) {
|
|
throw new UnknownHostException("Unable to resolve address "
|
|
+ Arrays.toString(addr) + " as hosts file " + hostsFile
|
|
+ " not found ");
|
|
}
|
|
|
|
if ((host == null) || (host.isEmpty()) || (host.equals(" "))) {
|
|
throw new UnknownHostException("Requested address "
|
|
+ Arrays.toString(addr)
|
|
+ " resolves to an invalid entry in hosts file "
|
|
+ hostsFile);
|
|
}
|
|
return host;
|
|
}
|
|
|
|
/**
|
|
* <p>Lookup a host mapping by name. Retrieve the IP addresses
|
|
* associated with a host.
|
|
*
|
|
* <p>Search the configured hosts file for the addresses associated
|
|
* with the specified host name.
|
|
*
|
|
* @param host the specified hostname
|
|
* @param lookupPolicy IP addresses lookup policy which specifies addresses
|
|
* family and their order
|
|
* @return stream of IP addresses for the requested host
|
|
* @throws NullPointerException if either parameter is {@code null}
|
|
* @throws UnknownHostException
|
|
* if no IP address for the {@code host} could be found
|
|
*/
|
|
public Stream<InetAddress> lookupByName(String host, LookupPolicy lookupPolicy)
|
|
throws UnknownHostException {
|
|
String hostEntry;
|
|
String addrStr;
|
|
byte addr[];
|
|
|
|
Objects.requireNonNull(host);
|
|
Objects.requireNonNull(lookupPolicy);
|
|
List<InetAddress> inetAddresses = new ArrayList<>();
|
|
List<InetAddress> inet4Addresses = new ArrayList<>();
|
|
List<InetAddress> inet6Addresses = new ArrayList<>();
|
|
int flags = lookupPolicy.characteristics();
|
|
boolean needIPv4 = (flags & IPv4) != 0;
|
|
boolean needIPv6 = (flags & IPv6) != 0;
|
|
|
|
// lookup the file and create a list InetAddress for the specified host
|
|
try (Scanner hostsFileScanner = new Scanner(new File(hostsFile),
|
|
UTF_8.INSTANCE)) {
|
|
while (hostsFileScanner.hasNextLine()) {
|
|
hostEntry = hostsFileScanner.nextLine();
|
|
if (!hostEntry.startsWith("#")) {
|
|
hostEntry = removeComments(hostEntry);
|
|
if (hostEntry.contains(host)) {
|
|
addrStr = extractHostAddr(hostEntry, host);
|
|
if ((addrStr != null) && (!addrStr.isEmpty())) {
|
|
addr = createAddressByteArray(addrStr);
|
|
if (addr != null) {
|
|
InetAddress address = InetAddress.getByAddress(host, addr);
|
|
inetAddresses.add(address);
|
|
if (address instanceof Inet4Address && needIPv4) {
|
|
inet4Addresses.add(address);
|
|
}
|
|
if (address instanceof Inet6Address && needIPv6) {
|
|
inet6Addresses.add(address);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} catch (IOException e) {
|
|
throw new UnknownHostException("Unable to resolve host " + host
|
|
+ " as hosts file " + hostsFile + " not found ");
|
|
}
|
|
// Check if only IPv4 addresses are requested
|
|
if (needIPv4 && !needIPv6) {
|
|
checkResultsList(inet4Addresses, host);
|
|
return inet4Addresses.stream();
|
|
}
|
|
// Check if only IPv6 addresses are requested
|
|
if (!needIPv4 && needIPv6) {
|
|
checkResultsList(inet6Addresses, host);
|
|
return inet6Addresses.stream();
|
|
}
|
|
// If both type of addresses are requested:
|
|
// First, check if there is any results. Then arrange
|
|
// addresses according to LookupPolicy value.
|
|
checkResultsList(inetAddresses, host);
|
|
if (ipv6AddressesFirst(flags)) {
|
|
return Stream.concat(inet6Addresses.stream(), inet4Addresses.stream());
|
|
} else if (ipv4AddressesFirst(flags)) {
|
|
return Stream.concat(inet4Addresses.stream(), inet6Addresses.stream());
|
|
}
|
|
// Only "system" addresses order is possible at this stage
|
|
assert systemAddressesOrder(flags);
|
|
return inetAddresses.stream();
|
|
}
|
|
|
|
// Checks if result list with addresses is not empty.
|
|
// If it is empty throw an UnknownHostException.
|
|
private void checkResultsList(List<InetAddress> addressesList, String hostName)
|
|
throws UnknownHostException {
|
|
if (addressesList.isEmpty()) {
|
|
throw new UnknownHostException("Unable to resolve host " + hostName
|
|
+ " in hosts file " + hostsFile);
|
|
}
|
|
}
|
|
|
|
private String removeComments(String hostsEntry) {
|
|
String filteredEntry = hostsEntry;
|
|
int hashIndex;
|
|
|
|
if ((hashIndex = hostsEntry.indexOf("#")) != -1) {
|
|
filteredEntry = hostsEntry.substring(0, hashIndex);
|
|
}
|
|
return filteredEntry;
|
|
}
|
|
|
|
private byte [] createAddressByteArray(String addrStr) {
|
|
byte[] addrArray;
|
|
// check if IPV4 address - most likely
|
|
addrArray = IPAddressUtil.textToNumericFormatV4(addrStr);
|
|
if (addrArray == null) {
|
|
addrArray = IPAddressUtil.textToNumericFormatV6(addrStr);
|
|
}
|
|
return addrArray;
|
|
}
|
|
|
|
/** host to ip address mapping */
|
|
private String extractHostAddr(String hostEntry, String host) {
|
|
String[] mapping = hostEntry.split("\\s+");
|
|
String hostAddr = null;
|
|
|
|
if (mapping.length >= 2) {
|
|
// look at the host aliases
|
|
for (int i = 1; i < mapping.length; i++) {
|
|
if (mapping[i].equalsIgnoreCase(host)) {
|
|
hostAddr = mapping[0];
|
|
}
|
|
}
|
|
}
|
|
return hostAddr;
|
|
}
|
|
}
|
|
|
|
static final InetAddressImpl impl;
|
|
|
|
/**
|
|
* Platform-wide {@code LookupPolicy} initialized from {@code "java.net.preferIPv4Stack"},
|
|
* {@code "java.net.preferIPv6Addresses"} system properties.
|
|
*/
|
|
static final LookupPolicy PLATFORM_LOOKUP_POLICY;
|
|
|
|
static {
|
|
// create the impl
|
|
impl = isIPv6Supported() ?
|
|
new Inet6AddressImpl() : new Inet4AddressImpl();
|
|
|
|
// impl must be initialized before calling this method
|
|
PLATFORM_LOOKUP_POLICY = initializePlatformLookupPolicy();
|
|
|
|
// create built-in resolver
|
|
BUILTIN_RESOLVER = createBuiltinInetAddressResolver();
|
|
}
|
|
|
|
/**
|
|
* Create an instance of the InetAddressResolver interface based on
|
|
* the setting of the {@code jdk.net.hosts.file} system property.
|
|
*
|
|
* <p>The default InetAddressResolver is the PlatformResolver, which typically
|
|
* delegates name and address resolution calls to the underlying
|
|
* OS network libraries.
|
|
*
|
|
* <p> A HostsFileResolver is created if the {@code jdk.net.hosts.file}
|
|
* system property is set. If the specified file doesn't exist, the name or
|
|
* address lookup will result in an UnknownHostException. Thus, non existent
|
|
* hosts file is handled as if the file is empty.
|
|
*
|
|
* @return an InetAddressResolver
|
|
*/
|
|
private static InetAddressResolver createBuiltinInetAddressResolver() {
|
|
InetAddressResolver theResolver;
|
|
if (HOSTS_FILE_NAME != null) {
|
|
theResolver = new HostsFileResolver(HOSTS_FILE_NAME);
|
|
} else {
|
|
theResolver = new PlatformResolver();
|
|
}
|
|
return theResolver;
|
|
}
|
|
|
|
/**
|
|
* Creates an InetAddress based on the provided host name and IP address.
|
|
* The system-wide {@linkplain InetAddressResolver resolver} is not used to check
|
|
* the validity of the address.
|
|
*
|
|
* <p> The host name can either be a machine name, such as
|
|
* "{@code www.example.com}", or a textual representation of its IP
|
|
* address.
|
|
* <p> No validity checking is done on the host name either.
|
|
*
|
|
* <p> If addr specifies an IPv4 address an instance of Inet4Address
|
|
* will be returned; otherwise, an instance of Inet6Address
|
|
* will be returned.
|
|
*
|
|
* <p> IPv4 address byte array must be 4 bytes long and IPv6 byte array
|
|
* must be 16 bytes long
|
|
*
|
|
* @param host the specified host
|
|
* @param addr the raw IP address in network byte order
|
|
* @return an InetAddress object created from the raw IP address.
|
|
* @throws UnknownHostException if IP address is of illegal length
|
|
* @since 1.4
|
|
*/
|
|
public static InetAddress getByAddress(String host, byte[] addr)
|
|
throws UnknownHostException {
|
|
if (host != null && !host.isEmpty() && host.charAt(0) == '[') {
|
|
if (host.charAt(host.length()-1) == ']') {
|
|
host = host.substring(1, host.length() -1);
|
|
}
|
|
}
|
|
if (addr != null) {
|
|
if (addr.length == Inet4Address.INADDRSZ) {
|
|
return new Inet4Address(host, addr);
|
|
} else if (addr.length == Inet6Address.INADDRSZ) {
|
|
byte[] newAddr
|
|
= IPAddressUtil.convertFromIPv4MappedAddress(addr);
|
|
if (newAddr != null) {
|
|
return new Inet4Address(host, newAddr);
|
|
} else {
|
|
return new Inet6Address(host, addr);
|
|
}
|
|
}
|
|
}
|
|
throw new UnknownHostException("addr is of illegal length");
|
|
}
|
|
|
|
|
|
/**
|
|
* Determines the IP address of a host, given the host's name.
|
|
*
|
|
* <p> The host name can either be a machine name, such as
|
|
* "{@code www.example.com}", or a textual representation of its
|
|
* IP address. If a literal IP address is supplied, only the
|
|
* validity of the address format is checked.
|
|
*
|
|
* <p> For {@code host} specified in literal IPv6 address,
|
|
* either the form defined in RFC 2732 or the literal IPv6 address
|
|
* format defined in RFC 2373 is accepted. IPv6 scoped addresses are also
|
|
* supported. See <a href="Inet6Address.html#scoped">here</a> for a description of IPv6
|
|
* scoped addresses.
|
|
*
|
|
* <p> If the host is {@code null} or {@code host.length()} is equal
|
|
* to zero, then an {@code InetAddress} representing an address of the
|
|
* loopback interface is returned.
|
|
* See <a href="http://www.ietf.org/rfc/rfc3330.txt">RFC 3330</a>
|
|
* section 2 and <a href="http://www.ietf.org/rfc/rfc2373.txt">RFC 2373</a>
|
|
* section 2.5.3.
|
|
*
|
|
* <p> If there is a security manager, and {@code host} is not {@code null}
|
|
* or {@code host.length() } is not equal to zero, the security manager's
|
|
* {@code checkConnect} method is called with the hostname and {@code -1}
|
|
* as its arguments to determine if the operation is allowed.
|
|
*
|
|
* @param host the specified host, or {@code null}.
|
|
* @return an IP address for the given host name.
|
|
* @throws UnknownHostException if no IP address for the
|
|
* {@code host} could be found, or if a scope_id was specified
|
|
* for a global IPv6 address.
|
|
* @throws SecurityException if a security manager exists
|
|
* and its checkConnect method doesn't allow the operation
|
|
*/
|
|
public static InetAddress getByName(String host)
|
|
throws UnknownHostException {
|
|
return InetAddress.getAllByName(host)[0];
|
|
}
|
|
|
|
/**
|
|
* Given the name of a host, returns an array of its IP addresses,
|
|
* based on the configured system {@linkplain InetAddressResolver resolver}.
|
|
*
|
|
* <p> The host name can either be a machine name, such as
|
|
* "{@code www.example.com}", or a textual representation of its IP
|
|
* address. If a literal IP address is supplied, only the
|
|
* validity of the address format is checked.
|
|
*
|
|
* <p> For {@code host} specified in <i>literal IPv6 address</i>,
|
|
* either the form defined in RFC 2732 or the literal IPv6 address
|
|
* format defined in RFC 2373 is accepted. A literal IPv6 address may
|
|
* also be qualified by appending a scoped zone identifier or scope_id.
|
|
* The syntax and usage of scope_ids is described
|
|
* <a href="Inet6Address.html#scoped">here</a>.
|
|
*
|
|
* <p> If the host is {@code null} or {@code host.length()} is equal
|
|
* to zero, then an {@code InetAddress} representing an address of the
|
|
* loopback interface is returned.
|
|
* See <a href="http://www.ietf.org/rfc/rfc3330.txt">RFC 3330</a>
|
|
* section 2 and <a href="http://www.ietf.org/rfc/rfc2373.txt">RFC 2373</a>
|
|
* section 2.5.3. </p>
|
|
*
|
|
* <p> If there is a security manager, and {@code host} is not {@code null}
|
|
* or {@code host.length() } is not equal to zero, the security manager's
|
|
* {@code checkConnect} method is called with the hostname and {@code -1}
|
|
* as its arguments to determine if the operation is allowed.
|
|
*
|
|
* @param host the name of the host, or {@code null}.
|
|
* @return an array of all the IP addresses for a given host name.
|
|
*
|
|
* @throws UnknownHostException if no IP address for the
|
|
* {@code host} could be found, or if a scope_id was specified
|
|
* for a global IPv6 address.
|
|
* @throws SecurityException if a security manager exists and its
|
|
* {@code checkConnect} method doesn't allow the operation.
|
|
*
|
|
* @see SecurityManager#checkConnect
|
|
*/
|
|
public static InetAddress[] getAllByName(String host)
|
|
throws UnknownHostException {
|
|
|
|
if (host == null || host.isEmpty()) {
|
|
InetAddress[] ret = new InetAddress[1];
|
|
ret[0] = impl.loopbackAddress();
|
|
return ret;
|
|
}
|
|
|
|
boolean ipv6Expected = false;
|
|
if (host.charAt(0) == '[') {
|
|
// This is supposed to be an IPv6 literal
|
|
if (host.length() > 2 && host.charAt(host.length()-1) == ']') {
|
|
host = host.substring(1, host.length() -1);
|
|
ipv6Expected = true;
|
|
} else {
|
|
// This was supposed to be a IPv6 address, but it's not!
|
|
throw new UnknownHostException(host + ": invalid IPv6 address");
|
|
}
|
|
}
|
|
|
|
// if host is an IP address, we won't do further lookup
|
|
if (Character.digit(host.charAt(0), 16) != -1
|
|
|| (host.charAt(0) == ':')) {
|
|
byte[] addr = null;
|
|
int numericZone = -1;
|
|
String ifname = null;
|
|
// see if it is IPv4 address
|
|
addr = IPAddressUtil.textToNumericFormatV4(host);
|
|
if (addr == null) {
|
|
// This is supposed to be an IPv6 literal
|
|
// Check if a numeric or string zone id is present
|
|
int pos;
|
|
if ((pos=host.indexOf ('%')) != -1) {
|
|
numericZone = checkNumericZone (host);
|
|
if (numericZone == -1) { /* remainder of string must be an ifname */
|
|
ifname = host.substring (pos+1);
|
|
}
|
|
}
|
|
if ((addr = IPAddressUtil.textToNumericFormatV6(host)) == null && host.contains(":")) {
|
|
throw new UnknownHostException(host + ": invalid IPv6 address");
|
|
}
|
|
} else if (ipv6Expected) {
|
|
// Means an IPv4 literal between brackets!
|
|
throw new UnknownHostException("["+host+"]");
|
|
}
|
|
InetAddress[] ret = new InetAddress[1];
|
|
if(addr != null) {
|
|
if (addr.length == Inet4Address.INADDRSZ) {
|
|
ret[0] = new Inet4Address(null, addr);
|
|
} else {
|
|
if (ifname != null) {
|
|
ret[0] = new Inet6Address(null, addr, ifname);
|
|
} else {
|
|
ret[0] = new Inet6Address(null, addr, numericZone);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
} else if (ipv6Expected) {
|
|
// We were expecting an IPv6 Literal, but got something else
|
|
throw new UnknownHostException("["+host+"]");
|
|
}
|
|
return getAllByName0(host, true, true);
|
|
}
|
|
|
|
/**
|
|
* Returns the loopback address.
|
|
* <p>
|
|
* The InetAddress returned will represent the IPv4
|
|
* loopback address, 127.0.0.1, or the IPv6 loopback
|
|
* address, ::1. The IPv4 loopback address returned
|
|
* is only one of many in the form 127.*.*.*
|
|
*
|
|
* @return the InetAddress loopback instance.
|
|
* @since 1.7
|
|
*/
|
|
public static InetAddress getLoopbackAddress() {
|
|
return impl.loopbackAddress();
|
|
}
|
|
|
|
|
|
/**
|
|
* check if the literal address string has %nn appended
|
|
* returns -1 if not, or the numeric value otherwise.
|
|
*
|
|
* %nn may also be a string that represents the displayName of
|
|
* a currently available NetworkInterface.
|
|
*/
|
|
private static int checkNumericZone (String s) throws UnknownHostException {
|
|
int percent = s.indexOf ('%');
|
|
int slen = s.length();
|
|
int digit, zone=0;
|
|
if (percent == -1) {
|
|
return -1;
|
|
}
|
|
for (int i=percent+1; i<slen; i++) {
|
|
char c = s.charAt(i);
|
|
if (c == ']') {
|
|
if (i == percent+1) {
|
|
/* empty per-cent field */
|
|
return -1;
|
|
}
|
|
break;
|
|
}
|
|
if ((digit = Character.digit (c, 10)) < 0) {
|
|
return -1;
|
|
}
|
|
zone = (zone * 10) + digit;
|
|
}
|
|
return zone;
|
|
}
|
|
|
|
/**
|
|
* package private so SocketPermission can call it
|
|
*/
|
|
static InetAddress[] getAllByName0 (String host, boolean check)
|
|
throws UnknownHostException {
|
|
return getAllByName0(host, check, true);
|
|
}
|
|
|
|
/**
|
|
* Designated lookup method.
|
|
*
|
|
* @param host host name to look up
|
|
* @param check perform security check
|
|
* @param useCache use cached value if not expired else always
|
|
* perform name service lookup (and cache the result)
|
|
* @return array of InetAddress(es)
|
|
* @throws UnknownHostException if host name is not found
|
|
*/
|
|
private static InetAddress[] getAllByName0(String host,
|
|
boolean check,
|
|
boolean useCache)
|
|
throws UnknownHostException {
|
|
|
|
/* If it gets here it is presumed to be a hostname */
|
|
|
|
/* make sure the connection to the host is allowed, before we
|
|
* give out a hostname
|
|
*/
|
|
if (check) {
|
|
@SuppressWarnings("removal")
|
|
SecurityManager security = System.getSecurityManager();
|
|
if (security != null) {
|
|
security.checkConnect(host, -1);
|
|
}
|
|
}
|
|
|
|
// remove expired addresses from cache - expirySet keeps them ordered
|
|
// by expiry time so we only need to iterate the prefix of the NavigableSet...
|
|
long now = System.nanoTime();
|
|
for (CachedAddresses caddrs : expirySet) {
|
|
// compare difference of time instants rather than
|
|
// time instants directly, to avoid possible overflow.
|
|
// (see System.nanoTime() recommendations...)
|
|
if ((caddrs.expiryTime - now) < 0L) {
|
|
// ConcurrentSkipListSet uses weakly consistent iterator,
|
|
// so removing while iterating is OK...
|
|
if (expirySet.remove(caddrs)) {
|
|
// ... remove from cache
|
|
cache.remove(caddrs.host, caddrs);
|
|
}
|
|
} else {
|
|
// we encountered 1st element that expires in future
|
|
break;
|
|
}
|
|
}
|
|
|
|
// look-up or remove from cache
|
|
Addresses addrs;
|
|
if (useCache) {
|
|
addrs = cache.get(host);
|
|
} else {
|
|
addrs = cache.remove(host);
|
|
if (addrs != null) {
|
|
if (addrs instanceof CachedAddresses) {
|
|
// try removing from expirySet too if CachedAddresses
|
|
expirySet.remove(addrs);
|
|
}
|
|
addrs = null;
|
|
}
|
|
}
|
|
|
|
if (addrs == null) {
|
|
// create a NameServiceAddresses instance which will look up
|
|
// the name service and install it within cache...
|
|
Addresses oldAddrs = cache.putIfAbsent(
|
|
host,
|
|
addrs = new NameServiceAddresses(host)
|
|
);
|
|
if (oldAddrs != null) { // lost putIfAbsent race
|
|
addrs = oldAddrs;
|
|
}
|
|
}
|
|
|
|
// ask Addresses to get an array of InetAddress(es) and clone it
|
|
return addrs.get().clone();
|
|
}
|
|
|
|
static InetAddress[] getAddressesFromNameService(String host)
|
|
throws UnknownHostException {
|
|
Stream<InetAddress> addresses = null;
|
|
UnknownHostException ex = null;
|
|
|
|
var resolver = resolver();
|
|
try {
|
|
addresses = resolver.lookupByName(host, PLATFORM_LOOKUP_POLICY);
|
|
} catch (RuntimeException | UnknownHostException x) {
|
|
if (host.equalsIgnoreCase("localhost")) {
|
|
addresses = Stream.of(impl.loopbackAddress());
|
|
} else if (x instanceof UnknownHostException uhe) {
|
|
ex = uhe;
|
|
} else {
|
|
ex = new UnknownHostException();
|
|
ex.initCause(x);
|
|
}
|
|
}
|
|
InetAddress[] result = addresses == null ? null
|
|
: addresses.toArray(InetAddress[]::new);
|
|
if (result == null || result.length == 0) {
|
|
throw ex == null ? new UnknownHostException(host) : ex;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Returns an {@code InetAddress} object given the raw IP address .
|
|
* The argument is in network byte order: the highest order
|
|
* byte of the address is in {@code getAddress()[0]}.
|
|
*
|
|
* <p> This method doesn't block, i.e. no reverse lookup is performed.
|
|
*
|
|
* <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 network byte order
|
|
* @return an InetAddress object created from the raw IP address.
|
|
* @throws UnknownHostException if IP address is of illegal length
|
|
* @since 1.4
|
|
*/
|
|
public static InetAddress getByAddress(byte[] addr)
|
|
throws UnknownHostException {
|
|
return getByAddress(null, addr);
|
|
}
|
|
|
|
private static final class CachedLocalHost {
|
|
final String host;
|
|
final InetAddress addr;
|
|
final long expiryTime = System.nanoTime() + 5000_000_000L; // now + 5s;
|
|
|
|
CachedLocalHost(String host, InetAddress addr) {
|
|
this.host = host;
|
|
this.addr = addr;
|
|
}
|
|
}
|
|
|
|
private static volatile CachedLocalHost cachedLocalHost;
|
|
|
|
/**
|
|
* Returns the address of the local host. This is achieved by retrieving
|
|
* the name of the host from the system, then resolving that name into
|
|
* an {@code InetAddress}.
|
|
*
|
|
* <P>Note: The resolved address may be cached for a short period of time.
|
|
* </P>
|
|
*
|
|
* <p>If there is a security manager, its
|
|
* {@code checkConnect} method is called
|
|
* with the local host name and {@code -1}
|
|
* as its arguments to see if the operation is allowed.
|
|
* If the operation is not allowed, an InetAddress representing
|
|
* the loopback address is returned.
|
|
*
|
|
* @return the address of the local host.
|
|
*
|
|
* @throws UnknownHostException if the local host name could not
|
|
* be resolved into an address.
|
|
*
|
|
* @see SecurityManager#checkConnect
|
|
* @see java.net.InetAddress#getByName(java.lang.String)
|
|
*/
|
|
public static InetAddress getLocalHost() throws UnknownHostException {
|
|
|
|
@SuppressWarnings("removal")
|
|
SecurityManager security = System.getSecurityManager();
|
|
try {
|
|
// is cached data still valid?
|
|
CachedLocalHost clh = cachedLocalHost;
|
|
if (clh != null && (clh.expiryTime - System.nanoTime()) >= 0L) {
|
|
if (security != null) {
|
|
security.checkConnect(clh.host, -1);
|
|
}
|
|
return clh.addr;
|
|
}
|
|
|
|
String local = impl.getLocalHostName();
|
|
|
|
if (security != null) {
|
|
security.checkConnect(local, -1);
|
|
}
|
|
|
|
InetAddress localAddr;
|
|
if (local.equals("localhost")) {
|
|
// shortcut for "localhost" host name
|
|
localAddr = impl.loopbackAddress();
|
|
} else {
|
|
// call getAllByName0 without security checks and
|
|
// without using cached data
|
|
try {
|
|
localAddr = getAllByName0(local, false, false)[0];
|
|
} catch (UnknownHostException uhe) {
|
|
// Rethrow with a more informative error message.
|
|
UnknownHostException uhe2 =
|
|
new UnknownHostException(local + ": " +
|
|
uhe.getMessage());
|
|
uhe2.initCause(uhe);
|
|
throw uhe2;
|
|
}
|
|
}
|
|
cachedLocalHost = new CachedLocalHost(local, localAddr);
|
|
return localAddr;
|
|
} catch (java.lang.SecurityException e) {
|
|
return impl.loopbackAddress();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Perform class load-time initializations.
|
|
*/
|
|
private static native void init();
|
|
|
|
|
|
/*
|
|
* Returns the InetAddress representing anyLocalAddress
|
|
* (typically 0.0.0.0 or ::0)
|
|
*/
|
|
static InetAddress anyLocalAddress() {
|
|
return impl.anyLocalAddress();
|
|
}
|
|
|
|
private static final jdk.internal.misc.Unsafe UNSAFE
|
|
= jdk.internal.misc.Unsafe.getUnsafe();
|
|
private static final long FIELDS_OFFSET
|
|
= UNSAFE.objectFieldOffset(InetAddress.class, "holder");
|
|
|
|
/**
|
|
* Restores the state of this object from the stream.
|
|
*
|
|
* @param s the {@code ObjectInputStream} from which data is read
|
|
* @throws IOException if an I/O error occurs
|
|
* @throws ClassNotFoundException if a serialized class cannot be loaded
|
|
*/
|
|
@java.io.Serial
|
|
private void readObject (ObjectInputStream s) throws
|
|
IOException, ClassNotFoundException {
|
|
GetField gf = s.readFields();
|
|
String host = (String)gf.get("hostName", null);
|
|
int address = gf.get("address", 0);
|
|
int family = gf.get("family", 0);
|
|
if (family != IPv4 && family != IPv6) {
|
|
throw new InvalidObjectException("invalid address family type: " + family);
|
|
}
|
|
InetAddressHolder h = new InetAddressHolder(host, address, family);
|
|
UNSAFE.putReference(this, FIELDS_OFFSET, h);
|
|
}
|
|
|
|
/* needed because the serializable fields no longer exist */
|
|
|
|
/**
|
|
* @serialField hostName String the hostname for this address
|
|
* @serialField address int holds a 32-bit IPv4 address.
|
|
* @serialField family int specifies the address family type, for instance,
|
|
* {@code '1'} for IPv4 addresses, and {@code '2'} for IPv6 addresses.
|
|
*/
|
|
@java.io.Serial
|
|
private static final ObjectStreamField[] serialPersistentFields = {
|
|
new ObjectStreamField("hostName", String.class),
|
|
new ObjectStreamField("address", int.class),
|
|
new ObjectStreamField("family", int.class),
|
|
};
|
|
|
|
/**
|
|
* Writes the state of this object to the stream.
|
|
*
|
|
* @param s the {@code ObjectOutputStream} to which data is written
|
|
* @throws IOException if an I/O error occurs
|
|
*/
|
|
@java.io.Serial
|
|
private void writeObject (ObjectOutputStream s) throws IOException {
|
|
PutField pf = s.putFields();
|
|
pf.put("hostName", holder().getHostName());
|
|
pf.put("address", holder().getAddress());
|
|
pf.put("family", holder().getFamily());
|
|
s.writeFields();
|
|
}
|
|
}
|