| /* NetworkInterface.java -- |
| Copyright (C) 2002, 2003, 2004, 2005, 2006, 2008 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package java.net; |
| |
| import gnu.classpath.SystemProperties; |
| |
| import gnu.java.lang.CPStringBuilder; |
| |
| import java.util.Enumeration; |
| import java.util.Iterator; |
| import java.util.Vector; |
| |
| /** |
| * This class models a network interface on the host computer. A network |
| * interface contains a name (typically associated with a specific |
| * hardware adapter) and a list of addresses that are bound to it. |
| * For example, an ethernet interface may be named "eth0" and have the |
| * address 192.168.1.101 assigned to it. |
| * |
| * @author Michael Koch (konqueror@gmx.de) |
| * @since 1.4 |
| */ |
| public final class NetworkInterface |
| { |
| private final VMNetworkInterface netif; |
| |
| private NetworkInterface(VMNetworkInterface netif) |
| { |
| this.netif = netif; |
| } |
| |
| /** Creates an NetworkInterface instance which |
| * represents any interface in the system. Its only |
| * address is <code>0.0.0.0/0.0.0.0</code>. This |
| * method is needed by {@link MulticastSocket#getNetworkInterface} |
| */ |
| static NetworkInterface createAnyInterface() |
| { |
| return new NetworkInterface(new VMNetworkInterface()); |
| } |
| |
| /** |
| * Returns the name of the network interface |
| * |
| * @return The name of the interface. |
| */ |
| public String getName() |
| { |
| return netif.name; |
| } |
| |
| /** |
| * Returns all available addresses of the network interface |
| * |
| * If a @see SecurityManager is available all addresses are checked |
| * with @see SecurityManager::checkConnect() if they are available. |
| * Only <code>InetAddresses</code> are returned where the security manager |
| * doesn't throw an exception. |
| * |
| * @return An enumeration of all addresses. |
| */ |
| public Enumeration<InetAddress> getInetAddresses() |
| { |
| SecurityManager s = System.getSecurityManager(); |
| Vector<InetAddress> inetAddresses |
| = new Vector<InetAddress>(netif.addresses); |
| |
| if (s == null) |
| return inetAddresses.elements(); |
| |
| Vector<InetAddress> tmpInetAddresses = new Vector<InetAddress>(1, 1); |
| |
| for (Enumeration<InetAddress> addresses = inetAddresses.elements(); |
| addresses.hasMoreElements();) |
| { |
| InetAddress addr = addresses.nextElement(); |
| try |
| { |
| s.checkConnect(addr.getHostAddress(), -1); |
| tmpInetAddresses.add(addr); |
| } |
| catch (SecurityException e) |
| { |
| // Ignore. |
| } |
| } |
| |
| return tmpInetAddresses.elements(); |
| } |
| |
| /** |
| * Returns the display name of the interface |
| * |
| * @return The display name of the interface |
| */ |
| public String getDisplayName() |
| { |
| return netif.name; |
| } |
| |
| /** |
| * Returns an network interface by name |
| * |
| * @param name The name of the interface to return |
| * |
| * @return a <code>NetworkInterface</code> object representing the interface, |
| * or null if there is no interface with that name. |
| * |
| * @exception SocketException If an error occurs |
| * @exception NullPointerException If the specified name is null |
| */ |
| public static NetworkInterface getByName(String name) |
| throws SocketException |
| { |
| if (name == null) |
| throw new NullPointerException(); |
| VMNetworkInterface[] netifs = VMNetworkInterface.getVMInterfaces(); |
| for (int i = 0; i < netifs.length; i++) |
| { |
| if (netifs[i].name.equals(name)) |
| return new NetworkInterface(netifs[i]); |
| } |
| return null; |
| } |
| |
| /** |
| * Return a network interface by its address |
| * |
| * @param addr The address of the interface to return |
| * |
| * @return the interface, or <code>null</code> if none found |
| * |
| * @exception SocketException If an error occurs |
| * @exception NullPointerException If the specified addess is null |
| */ |
| public static NetworkInterface getByInetAddress(InetAddress addr) |
| throws SocketException |
| { |
| if (addr == null) |
| throw new NullPointerException(); |
| VMNetworkInterface[] netifs = VMNetworkInterface.getVMInterfaces(); |
| for (int i = 0; i < netifs.length; i++) |
| { |
| if (netifs[i].addresses.contains(addr)) |
| return new NetworkInterface(netifs[i]); |
| } |
| return null; |
| } |
| |
| /** |
| * Return an <code>Enumeration</code> of all available network interfaces |
| * |
| * @return all interfaces |
| * |
| * @exception SocketException If an error occurs |
| */ |
| public static Enumeration<NetworkInterface> getNetworkInterfaces() |
| throws SocketException |
| { |
| VMNetworkInterface[] netifs = VMNetworkInterface.getVMInterfaces(); |
| Vector<NetworkInterface> networkInterfaces = |
| new Vector<NetworkInterface>(netifs.length); |
| for (int i = 0; i < netifs.length; i++) |
| { |
| if (!netifs[i].addresses.isEmpty()) |
| networkInterfaces.add(new NetworkInterface(netifs[i])); |
| } |
| return networkInterfaces.elements(); |
| } |
| |
| /** |
| * Checks if the current instance is equal to obj |
| * |
| * @param obj The object to compare with |
| * |
| * @return <code>true</code> if equal, <code>false</code> otherwise |
| */ |
| public boolean equals(Object obj) |
| { |
| if (! (obj instanceof NetworkInterface)) |
| return false; |
| |
| NetworkInterface tmp = (NetworkInterface) obj; |
| |
| if (netif.name == null) |
| return tmp.netif.name == null; |
| |
| return (netif.name.equals(tmp.netif.name) |
| && (netif.addresses.equals(tmp.netif.addresses))); |
| } |
| |
| /** |
| * Returns the hashcode of the current instance |
| * |
| * @return the hashcode |
| */ |
| public int hashCode() |
| { |
| // FIXME: hash correctly |
| int hc = netif.addresses.hashCode(); |
| |
| if (netif.name != null) |
| hc += netif.name.hashCode(); |
| |
| return hc; |
| } |
| |
| /** |
| * Returns a string representation of the interface |
| * |
| * @return the string |
| */ |
| public String toString() |
| { |
| // FIXME: check if this is correct |
| CPStringBuilder result; |
| String separator = SystemProperties.getProperty("line.separator"); |
| |
| result = new CPStringBuilder(); |
| |
| result.append("name: "); |
| result.append(getDisplayName()); |
| result.append(" (").append(getName()).append(") addresses:"); |
| result.append(separator); |
| |
| for (Iterator it = netif.addresses.iterator(); it.hasNext(); ) |
| { |
| InetAddress address = (InetAddress) it.next(); |
| result.append(address.toString()).append(";").append(separator); |
| } |
| |
| return result.toString(); |
| } |
| |
| /** |
| * Determines whether this interface is ready to transfer data. |
| * |
| * @return whether the interface is up |
| */ |
| public boolean isUp() |
| throws SocketException |
| { |
| return VMNetworkInterface.isUp(netif.name); |
| } |
| |
| /** |
| * Determines whether this interface does point to point |
| * transmission. |
| * |
| * @return whether the interface does point to point transmission |
| */ |
| public boolean isPointToPoint() |
| throws SocketException |
| { |
| return VMNetworkInterface.isPointToPoint(netif.name); |
| } |
| |
| /** |
| * Determines whether this interface is the loopback interface. |
| * |
| * @return whether the interface is the loopback interface |
| */ |
| public boolean isLoopback() |
| throws SocketException |
| { |
| return VMNetworkInterface.isLoopback(netif.name); |
| } |
| |
| /** |
| * Determines whether this interface supports multicast transmission. |
| * |
| * @return whether the interface supports multicast transmission. |
| */ |
| public boolean supportsMulticast() |
| throws SocketException |
| { |
| return VMNetworkInterface.supportsMulticast(netif.name); |
| } |
| |
| } |