df397ce2bd
2004-10-18 Michael Koch <konqueror@gmx.de> * java/net/Inet4Address.java: Merged file header and javadocs. * java/net/Inet6Address.java: Likewise. * java/net/InetAddress.java (getCanonicalHostName): Create Inet4Address object instead of InetAddress and add comment regarding IPv6. (toString): Simplified. From-SVN: r89211
766 lines
21 KiB
Java
766 lines
21 KiB
Java
/* InetAddress.java -- Class to model an Internet address
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Copyright (C) 1998, 1999, 2002, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.net;
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import gnu.classpath.Configuration;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.io.ObjectStreamException;
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import java.io.Serializable;
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/**
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* This class models an Internet address. It does not have a public
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* constructor. Instead, new instances of this objects are created
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* using the static methods getLocalHost(), getByName(), and
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* getAllByName().
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*
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* <p>This class fulfills the function of the C style functions gethostname(),
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* gethostbyname(), and gethostbyaddr(). It resolves Internet DNS names
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* into their corresponding numeric addresses and vice versa.</p>
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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* @author Per Bothner
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*
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* @specnote This class is not final since JK 1.4
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*/
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public class InetAddress implements Serializable
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{
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private static final long serialVersionUID = 3286316764910316507L;
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/**
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* Dummy InetAddress, used to bind socket to any (all) network interfaces.
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*/
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static InetAddress ANY_IF;
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private static final byte[] loopbackAddress = { 127, 0, 0, 1 };
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private static final InetAddress loopback
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= new Inet4Address(loopbackAddress, "localhost");
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private static InetAddress localhost = null;
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static
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{
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// load the shared library needed for name resolution
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if (Configuration.INIT_LOAD_LIBRARY)
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System.loadLibrary("javanet");
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byte[] zeros = { 0, 0, 0, 0 };
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ANY_IF = new Inet4Address(zeros, "0.0.0.0");
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}
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/**
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* The Serialized Form specifies that an int 'address' is saved/restored.
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* This class uses a byte array internally so we'll just do the conversion
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* at serialization time and leave the rest of the algorithm as is.
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*/
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private int address;
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/**
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* An array of octets representing an IP address.
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*/
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transient byte[] addr;
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/**
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* The name of the host for this address.
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*/
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String hostName;
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/**
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* The field 'family' seems to be the AF_ value.
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* FIXME: Much of the code in the other java.net classes does not make
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* use of this family field. A better implementation would be to make
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* use of getaddrinfo() and have other methods just check the family
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* field rather than examining the length of the address each time.
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*/
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int family;
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/**
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* Initializes this object's addr instance variable from the passed in
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* int array. Note that this constructor is protected and is called
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* only by static methods in this class.
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*
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* @param ipaddr The IP number of this address as an array of bytes
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* @param hostname The hostname of this IP address.
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*/
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InetAddress(byte[] ipaddr, String hostname)
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{
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addr = ipaddr;
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hostName = hostname;
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if (ipaddr != null)
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family = getFamily(ipaddr);
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}
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/**
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* Returns true if this address is a multicast address, false otherwise.
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* An address is multicast if the high four bits are "1110". These are
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* also known as "Class D" addresses.
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*
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* @return true if mulitcast, false if not
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*
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* @since 1.1
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*/
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public boolean isMulticastAddress()
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{
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// Mask against high order bits of 1110
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if (addr.length == 4)
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return (addr[0] & 0xF0) == 0xE0;
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// Mask against high order bits of 11111111
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if (addr.length == 16)
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return addr [0] == (byte) 0xFF;
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return false;
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}
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/**
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* Utility routine to check if the InetAddress in a wildcard address
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*
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* @since 1.4
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*/
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public boolean isAnyLocalAddress()
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{
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// This is the IPv4 implementation.
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// Any class derived from InetAddress should override this.
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return equals(ANY_IF);
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}
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/**
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* Utility routine to check if the InetAddress is a loopback address
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*
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* @since 1.4
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*/
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public boolean isLoopbackAddress()
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{
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// This is the IPv4 implementation.
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// Any class derived from InetAddress should override this.
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return addr[0] == 0x7F;
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}
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/**
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* Utility routine to check if InetAddress is a link local address
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*
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* @since 1.4
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*/
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public boolean isLinkLocalAddress()
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{
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// This is the IPv4 implementation.
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// Any class derived from InetAddress should override this.
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// XXX: This seems to not exist with IPv4 addresses
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return false;
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}
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/**
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* Utility routine to check if InetAddress is a site local address
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*
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* @since 1.4
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*/
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public boolean isSiteLocalAddress()
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{
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// This is the IPv4 implementation.
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// Any class derived from InetAddress should override this.
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// 10.0.0.0/8
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if (addr[0] == 0x0A)
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return true;
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// XXX: Suns JDK 1.4.1 (on Linux) seems to have a bug here:
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// it says 172.16.0.0 - 172.255.255.255 are site local addresses
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// 172.16.0.0/12
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if (addr[0] == 0xAC && (addr[1] & 0xF0) == 0x01)
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return true;
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// 192.168.0.0/16
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if (addr[0] == 0xC0 && addr[1] == 0xA8)
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return true;
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// XXX: Do we need to check more addresses here ?
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return false;
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}
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/**
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* Utility routine to check if InetAddress is a global multicast address
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*
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* @since 1.4
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*/
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public boolean isMCGlobal()
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{
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// This is the IPv4 implementation.
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// Any class derived from InetAddress should override this.
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// XXX: This seems to not exist with IPv4 addresses
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return false;
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}
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/**
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* Utility reoutine to check if InetAddress is a node local multicast address
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*
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* @since 1.4
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*/
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public boolean isMCNodeLocal()
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{
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// This is the IPv4 implementation.
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// Any class derived from InetAddress should override this.
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// XXX: This seems to not exist with IPv4 addresses
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return false;
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}
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/**
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* Utility reoutine to check if InetAddress is a link local multicast address
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*
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* @since 1.4
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*/
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public boolean isMCLinkLocal()
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{
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// This is the IPv4 implementation.
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// Any class derived from InetAddress should override this.
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if (! isMulticastAddress())
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return false;
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return (addr[0] == 0xE0 && addr[1] == 0x00 && addr[2] == 0x00);
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}
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/**
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* Utility routine to check if InetAddress is a site local multicast address
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*
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* @since 1.4
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*/
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public boolean isMCSiteLocal()
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{
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// This is the IPv4 implementation.
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// Any class derived from InetAddress should override this.
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// XXX: This seems to not exist with IPv4 addresses
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return false;
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}
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/**
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* Utility reoutine to check if InetAddress is a organization local
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* multicast address
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*
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* @since 1.4
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*/
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public boolean isMCOrgLocal()
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{
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// This is the IPv4 implementation.
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// Any class derived from InetAddress should override this.
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// XXX: This seems to not exist with IPv4 addresses
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return false;
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}
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/**
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* Returns the hostname for this address. This will return the IP address
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* as a String if there is no hostname available for this address
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*
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* @return The hostname for this address
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*/
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public String getHostName()
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{
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if (hostName != null)
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return hostName;
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// Lookup hostname and set field.
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lookup (null, this, false);
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return hostName;
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}
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/**
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* Returns the canonical hostname represented by this InetAddress
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*
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* @since 1.4
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*/
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public String getCanonicalHostName()
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{
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SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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{
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try
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{
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sm.checkConnect(hostName, -1);
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}
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catch (SecurityException e)
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{
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return getHostAddress();
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}
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}
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// Try to find the FDQN now
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// FIXME: This does not work with IPv6.
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InetAddress address = new Inet4Address(getAddress(), null);
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return address.getHostName();
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}
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/**
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* Returns the IP address of this object as a byte array.
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*
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* @return IP address
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*/
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public byte[] getAddress()
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{
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// An experiment shows that JDK1.2 returns a different byte array each
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// time. This makes sense, in terms of security.
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return (byte[]) addr.clone();
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}
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/* Helper function due to a CNI limitation. */
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private static InetAddress[] allocArray (int count)
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{
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return new InetAddress [count];
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}
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/* Helper function due to a CNI limitation. */
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private static SecurityException checkConnect (String hostname)
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{
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SecurityManager s = System.getSecurityManager();
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if (s == null)
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return null;
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try
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{
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s.checkConnect (hostname, -1);
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return null;
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}
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catch (SecurityException ex)
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{
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return ex;
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}
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}
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/**
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* Returns the IP address of this object as a String. The address is in
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* the dotted octet notation, for example, "127.0.0.1".
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*
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* @return The IP address of this object in String form
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*
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* @since 1.0.2
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*/
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public String getHostAddress()
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{
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StringBuffer sb = new StringBuffer(40);
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int len = addr.length;
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int i = 0;
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if (len == 16)
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{ // An IPv6 address.
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for ( ; ; i += 2)
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{
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if (i >= 16)
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return sb.toString();
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int x = ((addr [i] & 0xFF) << 8) | (addr [i + 1] & 0xFF);
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boolean empty = sb.length() == 0;
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if (empty)
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{
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if (i == 10 && x == 0xFFFF)
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{ // IPv4-mapped IPv6 address.
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sb.append (":FFFF:");
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break; // Continue as IPv4 address;
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}
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else if (i == 12)
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{ // IPv4-compatible IPv6 address.
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sb.append (':');
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break; // Continue as IPv4 address.
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}
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else if (i > 0)
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sb.append ("::");
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}
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else
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sb.append (':');
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if (x != 0 || i >= 14)
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sb.append (Integer.toHexString (x).toUpperCase());
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}
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}
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for ( ; ; )
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{
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sb.append(addr[i] & 0xff);
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i++;
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if (i == len)
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break;
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sb.append('.');
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}
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return sb.toString();
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}
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/**
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* Returns a hash value for this address. Useful for creating hash
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* tables. Overrides Object.hashCode()
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*
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* @return A hash value for this address.
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*/
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public int hashCode()
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{
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// There hashing algorithm is not specified, but a simple experiment
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// shows that it is equal to the address, as a 32-bit big-endian integer.
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int hash = 0;
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int len = addr.length;
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int i = len > 4 ? len - 4 : 0;
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for (; i < len; i++)
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hash = (hash << 8) | (addr[i] & 0xFF);
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return hash;
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}
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/**
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* Tests this address for equality against another InetAddress. The two
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* addresses are considered equal if they contain the exact same octets.
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* This implementation overrides Object.equals()
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*
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* @param obj The address to test for equality
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*
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* @return true if the passed in object's address is equal to this one's,
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* false otherwise
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*/
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public boolean equals(Object obj)
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{
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if (! (obj instanceof InetAddress))
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return false;
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// "The Java Class Libraries" 2nd edition says "If a machine has
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// multiple names instances of InetAddress for different name of
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// that same machine are not equal. This is because they have
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// different host names." This violates the description in the
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// JDK 1.2 API documentation. A little experimentation
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// shows that the latter is correct.
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byte[] addr2 = ((InetAddress) obj).addr;
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if (addr.length != addr2.length)
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return false;
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for (int i = 0; i < addr.length; i++)
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if (addr[i] != addr2[i])
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return false;
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return true;
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}
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/**
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* Converts this address to a String. This string contains the IP in
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* dotted decimal form. For example: "127.0.0.1" This method is equivalent
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* to getHostAddress() and overrides Object.toString()
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*
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* @return This address in String form
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*/
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public String toString()
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{
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String address = getHostAddress();
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String host = (hostName != null) ? hostName : address;
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return host + "/" + address;
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}
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/**
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* Returns an InetAddress object given the raw IP address.
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*
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* The argument is in network byte order: the highest order byte of the
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* address is in getAddress()[0].
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*
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* @param addr The IP address to create the InetAddress object from
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*
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* @exception UnknownHostException If IP address has illegal length
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*
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* @since 1.4
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*/
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public static InetAddress getByAddress(byte[] addr)
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throws UnknownHostException
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{
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return getByAddress(null, addr);
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}
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/**
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* Creates an InetAddress based on the provided host name and IP address.
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* No name service is checked for the validity of the address.
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*
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* @param host The hostname of the InetAddress object to create
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* @param addr The IP address to create the InetAddress object from
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*
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* @exception UnknownHostException If IP address is of illegal length
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*
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* @since 1.4
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*/
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public static InetAddress getByAddress(String host, byte[] addr)
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throws UnknownHostException
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{
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if (addr.length == 4)
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return new Inet4Address(addr, host);
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if (addr.length == 16)
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return new Inet6Address(addr, host);
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throw new UnknownHostException("IP address has illegal length");
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}
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/**
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* If host is a valid numeric IP address, return the numeric address.
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* Otherwise, return null.
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*/
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private static native byte[] aton (String host);
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private static native InetAddress[] lookup (String hostname,
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InetAddress addr, boolean all);
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private static native int getFamily (byte[] address);
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/**
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* Returns an InetAddress object representing the IP address of the given
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* hostname. This name can be either a hostname such as "www.urbanophile.com"
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* or an IP address in dotted decimal format such as "127.0.0.1". If the
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* hostname is null or "", the hostname of the local machine is supplied by
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* default. This method is equivalent to returning the first element in
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* the InetAddress array returned from GetAllByName.
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*
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* @param hostname The name of the desired host, or null for the local
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* loopback address.
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*
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* @return The address of the host as an InetAddress object.
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*
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* @exception UnknownHostException If no IP address for the host could
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* be found
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* @exception SecurityException If a security manager exists and its
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* checkConnect method doesn't allow the operation
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*/
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public static InetAddress getByName(String hostname)
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throws UnknownHostException
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{
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// If null or the empty string is supplied, the loopback address
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// is returned. Note that this is permitted without a security check.
|
|
if (hostname == null || hostname.length() == 0)
|
|
return loopback;
|
|
|
|
SecurityManager s = System.getSecurityManager();
|
|
if (s != null)
|
|
s.checkConnect(hostname, -1);
|
|
|
|
// Assume that the host string is an IP address
|
|
byte[] address = aton(hostname);
|
|
if (address != null)
|
|
{
|
|
if (address.length == 4)
|
|
return new Inet4Address (address, null);
|
|
else if (address.length == 16)
|
|
{
|
|
if ((address [10] == 0xFF) && (address [11] == 0xFF))
|
|
{
|
|
byte[] ip4addr = new byte [4];
|
|
ip4addr [0] = address [12];
|
|
ip4addr [1] = address [13];
|
|
ip4addr [2] = address [14];
|
|
ip4addr [3] = address [15];
|
|
return new Inet4Address (ip4addr, null);
|
|
}
|
|
return new Inet6Address (address, null);
|
|
}
|
|
else
|
|
throw new UnknownHostException ("Address has invalid length");
|
|
}
|
|
|
|
// Try to resolve the host by DNS
|
|
InetAddress result = new InetAddress(null, null);
|
|
lookup (hostname, result, false);
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Returns an array of InetAddress objects representing all the host/ip
|
|
* addresses of a given host, given the host's name. This name can be
|
|
* either a hostname such as "www.urbanophile.com" or an IP address in
|
|
* dotted decimal format such as "127.0.0.1". If the value is null, the
|
|
* hostname of the local machine is supplied by default.
|
|
*
|
|
* @param hostname The name of the desired host, or null for the
|
|
* local loopback address.
|
|
*
|
|
* @return All addresses of the host as an array of InetAddress objects.
|
|
*
|
|
* @exception UnknownHostException If no IP address for the host could
|
|
* be found
|
|
* @exception SecurityException If a security manager exists and its
|
|
* checkConnect method doesn't allow the operation
|
|
*/
|
|
public static InetAddress[] getAllByName(String hostname)
|
|
throws UnknownHostException
|
|
{
|
|
// If null or the empty string is supplied, the loopback address
|
|
// is returned. Note that this is permitted without a security check.
|
|
if (hostname == null || hostname.length() == 0)
|
|
return new InetAddress[] {loopback};
|
|
|
|
SecurityManager s = System.getSecurityManager();
|
|
if (s != null)
|
|
s.checkConnect(hostname, -1);
|
|
|
|
// Check if hostname is an IP address
|
|
byte[] address = aton (hostname);
|
|
if (address != null)
|
|
{
|
|
InetAddress[] result = new InetAddress [1];
|
|
result [0] = new InetAddress (address, null);
|
|
return result;
|
|
}
|
|
|
|
// Try to resolve the hostname by DNS
|
|
return lookup (hostname, null, true);
|
|
}
|
|
|
|
/**
|
|
* This native method looks up the hostname of the local machine
|
|
* we are on. If the actual hostname cannot be determined, then the
|
|
* value "localhost" will be used. This native method wrappers the
|
|
* "gethostname" function.
|
|
*
|
|
* @return The local hostname.
|
|
*/
|
|
private static native String getLocalHostname();
|
|
|
|
/**
|
|
* Returns an InetAddress object representing the address of the current
|
|
* host.
|
|
*
|
|
* @return The local host's address
|
|
*
|
|
* @exception UnknownHostException If no IP address for the host could
|
|
* be found
|
|
*/
|
|
public static InetAddress getLocalHost() throws UnknownHostException
|
|
{
|
|
SecurityManager s = System.getSecurityManager();
|
|
|
|
// Experimentation shows that JDK1.2 does cache the result.
|
|
// However, if there is a security manager, and the cached result
|
|
// is other than "localhost", we need to check again.
|
|
if (localhost == null
|
|
|| (s != null && ! localhost.isLoopbackAddress()))
|
|
getLocalHost (s);
|
|
|
|
return localhost;
|
|
}
|
|
|
|
private static synchronized void getLocalHost (SecurityManager s)
|
|
throws UnknownHostException
|
|
{
|
|
// Check the localhost cache again, now that we've synchronized.
|
|
if (s == null && localhost != null)
|
|
return;
|
|
|
|
String hostname = getLocalHostname();
|
|
|
|
if (s != null)
|
|
{
|
|
// "The Java Class Libraries" suggests that if the security
|
|
// manager disallows getting the local host name, then
|
|
// we use the loopback host.
|
|
// However, the JDK 1.2 API claims to throw SecurityException,
|
|
// which seems to suggest SecurityException is *not* caught.
|
|
// In this case, experimentation shows that former is correct.
|
|
try
|
|
{
|
|
// This is wrong, if the name returned from getLocalHostname()
|
|
// is not a fully qualified name. FIXME.
|
|
s.checkConnect (hostname, -1);
|
|
}
|
|
catch (SecurityException ex)
|
|
{
|
|
hostname = null;
|
|
}
|
|
}
|
|
|
|
if (hostname != null)
|
|
{
|
|
try
|
|
{
|
|
localhost = new InetAddress (null, null);
|
|
lookup (hostname, localhost, false);
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
}
|
|
}
|
|
|
|
if (localhost == null)
|
|
localhost = new InetAddress (loopbackAddress, "localhost");
|
|
}
|
|
|
|
/**
|
|
* Needed for serialization
|
|
*/
|
|
private void readResolve() throws ObjectStreamException
|
|
{
|
|
// FIXME: implement this
|
|
}
|
|
|
|
private void readObject(ObjectInputStream ois)
|
|
throws IOException, ClassNotFoundException
|
|
{
|
|
ois.defaultReadObject();
|
|
addr = new byte[4];
|
|
addr[3] = (byte) address;
|
|
|
|
for (int i = 2; i >= 0; --i)
|
|
addr[i] = (byte) (address >>= 8);
|
|
|
|
// Ignore family from serialized data. Since the saved address is 32 bits
|
|
// the deserialized object will have an IPv4 address i.e. AF_INET family.
|
|
// FIXME: An alternative is to call the aton method on the deserialized
|
|
// hostname to get a new address. The Serialized Form doc is silent
|
|
// on how these fields are used.
|
|
family = getFamily (addr);
|
|
}
|
|
|
|
private void writeObject(ObjectOutputStream oos) throws IOException
|
|
{
|
|
// Build a 32 bit address from the last 4 bytes of a 4 byte IPv4 address
|
|
// or a 16 byte IPv6 address.
|
|
int len = addr.length;
|
|
int i = len - 4;
|
|
|
|
for (; i < len; i++)
|
|
address = address << 8 | (((int) addr[i]) & 0xFF);
|
|
|
|
oos.defaultWriteObject();
|
|
}
|
|
}
|