300 lines
8.2 KiB
Java
300 lines
8.2 KiB
Java
/* NetworkInterface.java --
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Copyright (C) 2002, 2003, 2004, 2005 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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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 java.util.Collection;
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import java.util.Collections;
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import java.util.Enumeration;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Vector;
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/**
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* This class models a network interface on the host computer. A network
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* interface contains a name (typically associated with a specific
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* hardware adapter) and a list of addresses that are bound to it.
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* For example, an ethernet interface may be named "eth0" and have the
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* address 192.168.1.101 assigned to it.
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*
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* @author Michael Koch (konqueror@gmx.de)
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* @since 1.4
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*/
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public final class NetworkInterface
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{
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private String name;
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private Vector<InetAddress> inetAddresses;
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NetworkInterface(String name, InetAddress address)
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{
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this.name = name;
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this.inetAddresses = new Vector(1, 1);
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this.inetAddresses.add(address);
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}
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NetworkInterface(String name, InetAddress[] addresses)
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{
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this.name = name;
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this.inetAddresses = new Vector(addresses.length, 1);
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for (int i = 0; i < addresses.length; i++)
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this.inetAddresses.add(addresses[i]);
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}
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/**
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* Returns the name of the network interface
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*
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* @return The name of the interface.
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*/
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public String getName()
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{
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return name;
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}
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/**
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* Returns all available addresses of the network interface
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*
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* If a @see SecurityManager is available all addresses are checked
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* with @see SecurityManager::checkConnect() if they are available.
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* Only <code>InetAddresses</code> are returned where the security manager
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* doesn't throw an exception.
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*
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* @return An enumeration of all addresses.
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*/
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public Enumeration<InetAddress> getInetAddresses()
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{
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SecurityManager s = System.getSecurityManager();
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if (s == null)
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return inetAddresses.elements();
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Vector<InetAddress> tmpInetAddresses = new Vector<InetAddress>(1, 1);
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for (Enumeration<InetAddress> addresses = inetAddresses.elements();
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addresses.hasMoreElements();)
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{
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InetAddress addr = addresses.nextElement();
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try
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{
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s.checkConnect(addr.getHostAddress(), 58000);
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tmpInetAddresses.add(addr);
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}
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catch (SecurityException e)
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{
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// Ignore.
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}
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}
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return tmpInetAddresses.elements();
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}
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/**
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* Returns the display name of the interface
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*
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* @return The display name of the interface
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*/
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public String getDisplayName()
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{
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return name;
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}
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/**
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* Returns an network interface by name
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*
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* @param name The name of the interface to return
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*
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* @return a <code>NetworkInterface</code> object representing the interface,
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* or null if there is no interface with that name.
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*
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* @exception SocketException If an error occurs
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* @exception NullPointerException If the specified name is null
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*/
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public static NetworkInterface getByName(String name)
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throws SocketException
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{
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for (Enumeration e = getNetworkInterfaces(); e.hasMoreElements();)
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{
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NetworkInterface tmp = (NetworkInterface) e.nextElement();
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if (name.equals(tmp.getName()))
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return tmp;
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}
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// No interface with the given name found.
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return null;
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}
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/**
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* Return a network interface by its address
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*
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* @param addr The address of the interface to return
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*
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* @return the interface, or <code>null</code> if none found
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*
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* @exception SocketException If an error occurs
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* @exception NullPointerException If the specified addess is null
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*/
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public static NetworkInterface getByInetAddress(InetAddress addr)
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throws SocketException
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{
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for (Enumeration interfaces = getNetworkInterfaces();
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interfaces.hasMoreElements();)
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{
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NetworkInterface tmp = (NetworkInterface) interfaces.nextElement();
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for (Enumeration addresses = tmp.inetAddresses.elements();
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addresses.hasMoreElements();)
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{
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if (addr.equals((InetAddress) addresses.nextElement()))
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return tmp;
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}
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}
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throw new SocketException("no network interface is bound to such an IP address");
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}
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static private Collection condense(Collection interfaces)
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{
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final Map condensed = new HashMap();
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final Iterator interfs = interfaces.iterator();
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while (interfs.hasNext()) {
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final NetworkInterface face = (NetworkInterface) interfs.next();
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final String name = face.getName();
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if (condensed.containsKey(name))
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{
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final NetworkInterface conface = (NetworkInterface) condensed.get(name);
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if (!conface.inetAddresses.containsAll(face.inetAddresses))
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{
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final Iterator faceAddresses = face.inetAddresses.iterator();
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while (faceAddresses.hasNext())
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{
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final InetAddress faceAddress = (InetAddress) faceAddresses.next();
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if (!conface.inetAddresses.contains(faceAddress))
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{
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conface.inetAddresses.add(faceAddress);
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}
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}
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}
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}
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else
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{
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condensed.put(name, face);
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}
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}
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return condensed.values();
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}
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/**
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* Return an <code>Enumeration</code> of all available network interfaces
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*
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* @return all interfaces
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*
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* @exception SocketException If an error occurs
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*/
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public static Enumeration<NetworkInterface> getNetworkInterfaces()
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throws SocketException
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{
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Vector<NetworkInterface> networkInterfaces =
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VMNetworkInterface.getInterfaces();
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if (networkInterfaces.isEmpty())
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return null;
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Collection condensed = condense(networkInterfaces);
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return Collections.enumeration(condensed);
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}
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/**
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* Checks if the current instance is equal to obj
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*
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* @param obj The object to compare with
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*
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* @return <code>true</code> if equal, <code>false</code> 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 NetworkInterface))
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return false;
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NetworkInterface tmp = (NetworkInterface) obj;
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return (name.equals(tmp.name) && inetAddresses.equals(tmp.inetAddresses));
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}
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/**
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* Returns the hashcode of the current instance
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*
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* @return the hashcode
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*/
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public int hashCode()
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{
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// FIXME: hash correctly
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return name.hashCode() + inetAddresses.hashCode();
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}
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/**
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* Returns a string representation of the interface
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*
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* @return the string
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*/
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public String toString()
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{
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// FIXME: check if this is correct
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String result;
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String separator = System.getProperty("line.separator");
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result =
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"name: " + getDisplayName() + " (" + getName() + ") addresses:"
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+ separator;
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for (Enumeration e = inetAddresses.elements(); e.hasMoreElements();)
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{
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InetAddress address = (InetAddress) e.nextElement();
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result += address.toString() + ";" + separator;
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}
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return result;
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}
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}
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