Java InetAddress Check isLocalIP(final InetAddress ip1, final InetAddress ip2, final int mask)

Description

is Local IP

License

Open Source License

Declaration

public static boolean isLocalIP(final InetAddress ip1, final InetAddress ip2, final int mask) 

Method Source Code

//package com.java2s;
/*// ww  w.  j a  va 2 s.  c o m
 * Author: Scott Ware <scoot.software@gmail.com>
 * Copyright (c) 2015 Scott Ware
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

import java.net.InetAddress;

public class Main {
    public static boolean isLocalIP(final InetAddress ip1, final InetAddress ip2, final int mask) {
        byte[] x = ip1.getAddress();
        byte[] y = ip2.getAddress();

        if (x == y) {
            return true;
        }

        if (x == null || y == null) {
            return false;
        }

        if (x.length != y.length) {
            return false;
        }

        final int bits = mask & 7;
        final int bytes = mask >>> 3;

        for (int i = 0; i < bytes; i++) {
            if (x[i] != y[i]) {
                return false;
            }
        }

        final int shift = 8 - bits;

        return !(bits != 0 && x[bytes] >>> shift != y[bytes] >>> shift);
    }
}

Related

1. isLocalAddress(InetAddress addr)
2. isLocalAddress(InetAddress addr)
3. isLocalAddress(InetAddress addr)
4. isLocalAddress(InetAddress address)
5. isLocalAddress(InetAddress address)
6. isLocalIpAddress(final InetAddress ipAddress)
7. isLoopbackAddress(InetAddress address)
8. isLoopbackIp(InetAddress addr)
9. isMulticastAddress(InetAddress ipAddr)