Java InetAddress Check isBroadcastAddress(InetAddress address)

Description

A IPv4 Broadcast Address <p>http://tools.ietf.org/html/rfc919

License

Apache License

Declaration

public static boolean isBroadcastAddress(InetAddress address) 

Method Source Code

//package com.java2s;
/*// w  ww  .j a  va  2s .  com
 * Copyright 2010-2012 Roger Kapsi
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */

import java.net.Inet4Address;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;

public class Main {
    /**
     * A IPv4 Broadcast Address
     * 
     * <p>http://tools.ietf.org/html/rfc919
     */
    public static boolean isBroadcastAddress(SocketAddress address) {
        return isBroadcastAddress(getAddress(address));
    }

    /**
     * A IPv4 Broadcast Address
     * 
     * <p>http://tools.ietf.org/html/rfc919
     */
    public static boolean isBroadcastAddress(InetAddress address) {
        return isBroadcastAddress(address.getAddress());
    }

    /**
     * A IPv4 Broadcast Address
     * 
     * <p>http://tools.ietf.org/html/rfc919
     */
    public static boolean isBroadcastAddress(byte[] address) {
        if (isClassicAddress(address) || isClassicMappedAddress(address)) {
            return (address[/* 0 */ address.length - 4] & 0xFF) == 0xFF;
        }

        return false;
    }

    /**
     * An utility method to get the {@link InetAddress} from the
     * {@link SocketAddress}.
     */
    public static InetAddress getAddress(SocketAddress address) {
        return getResolved(address).getAddress();
    }

    /**
     * Returns true if the given {@link SocketAddress} is an IPv4 address
     */
    public static boolean isClassicAddress(SocketAddress address) {
        return isClassicAddress(getAddress(address));
    }

    /**
     * Returns true if the given {@link InetAddress} is an IPv4 address
     */
    public static boolean isClassicAddress(InetAddress address) {
        return address instanceof Inet4Address;
    }

    /**
     * Returns true if the given address is an IPv4 address
     */
    public static boolean isClassicAddress(byte[] address) {
        return address.length == 4;
    }

    /**
     * Returns true if the given {@link SocketAddress} is an IPv4 address
     * that is embedded into a IPv6 frame. In other words if it's an IPv6
     * address in IPv4 address space.
     */
    public static boolean isClassicMappedAddress(SocketAddress address) {
        return isClassicMappedAddress(getAddress(address));
    }

    /**
     * Returns true if the given {@link InetAddress} is an IPv4 address
     * that is embedded into a IPv6 frame. In other words if it's an IPv6
     * address in IPv4 address space.
     */
    public static boolean isClassicMappedAddress(InetAddress address) {
        return isClassicMappedAddress(address.getAddress());
    }

    /**
     * Returns true if the given {@link InetAddress} is an IPv4 address
     * that is embedded into a IPv6 frame. In other words if it's an IPv6
     * address in IPv4 address space.
     */
    public static boolean isClassicMappedAddress(byte[] address) {
        if (address.length == 16 && (address[0] == 0x00) && (address[1] == 0x00) && (address[2] == 0x00)
                && (address[3] == 0x00) && (address[4] == 0x00) && (address[5] == 0x00) && (address[6] == 0x00)
                && (address[7] == 0x00) && (address[8] == 0x00) && (address[9] == 0x00)
                && (address[10] == (byte) 0xFF) && (address[11] == (byte) 0xFF)) {
            return true;
        }

        return false;
    }

    /**
     * Resolves (if necessary) the given {@link SocketAddress} and returns it.
     */
    public static InetSocketAddress getResolved(SocketAddress address) {
        InetSocketAddress isa = (InetSocketAddress) address;
        if (isa.isUnresolved()) {
            return new InetSocketAddress(isa.getHostName(), isa.getPort());
        }

        return isa;
    }

    /**
     * Returns {@code true} if the given {@link SocketAddress} is unresolved.
     */
    public static boolean isUnresolved(SocketAddress address) {
        return ((InetSocketAddress) address).isUnresolved();
    }

    /**
     * An utility method to get the {@link InetSocketAddress#getHostName()}.
     */
    public static String getHostName(SocketAddress address) {
        return ((InetSocketAddress) address).getHostName();
    }

    /**
     * Returns the port number.
     */
    public static int getPort(SocketAddress address) {
        return ((InetSocketAddress) address).getPort();
    }
}

Related

1. formatAddresses( List addresses)
2. getInetAddressList(NetworkInterface netInterface)
3. is6to4(InetAddress addr)
4. isAddressReachable(InetAddress address)
5. isAny(InetAddress ip)
6. IsBusy(final InetAddress remote, int port)
7. isClassicAddress(InetAddress address)
8. isCommonSubnet(InetAddress address1, InetAddress address2)
9. isGlobalAddressV6(InetAddress addr)