Java InetAddress Check isPrivate(InetAddress adr)

Description

is Private

License

Open Source License

Declaration

public static boolean isPrivate(InetAddress adr) 

Method Source Code

//package com.java2s;
/*//from www. j  a va 2 s.c  o  m
 * Copyright (C) 2009 Swedish Institute of Computer Science (SICS) Copyright (C)
 * 2009 Royal Institute of Technology (KTH)
 *
 * GVoD 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
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

import java.net.InetAddress;

public class Main {
    public static boolean isPrivate(InetAddress adr) {
        return !(isPublic(adr) || isLoopback(adr) || isTenDot(adr));
    }

    public static boolean isPublic(InetAddress adr) {
        return getOneDotPrefix(adr).equals("193");
    }

    public static boolean isLoopback(InetAddress adr) {
        return adr.isLoopbackAddress() || getTwoDotPrefix(adr).equals("127.0");
    }

    public static boolean isTenDot(InetAddress adr) {
        return getOneDotPrefix(adr).equals("10");
    }

    private static String getOneDotPrefix(InetAddress addr) {
        String textualPrefixAddr = addr.getHostAddress();
        int firstDot = textualPrefixAddr.indexOf(".");
        textualPrefixAddr = textualPrefixAddr.substring(0, firstDot);
        return textualPrefixAddr;
    }

    private static String getTwoDotPrefix(InetAddress addr) {
        String textualPrefixAddr = addr.getHostAddress();
        int firstDot = textualPrefixAddr.indexOf(".");
        int secondDot = textualPrefixAddr.indexOf(".", firstDot + 1);
        if (firstDot > 0) {
            textualPrefixAddr = textualPrefixAddr.substring(0, secondDot);
        }
        return textualPrefixAddr;
    }
}

Related

1. isOnNetwork(InetAddress host, InetAddress network, byte[] mask)
2. isPortFree(int port, InetAddress addr)
3. isPortInUse(InetAddress address, int port, int count)
4. isPortOpen(InetAddress address, int port)
5. isPrivate(InetAddress addr)
6. isPrivateIp(final InetAddress address)
7. isPrivateIp(InetAddress addr)
8. isPrivateIP(InetAddress ip)
9. isPrivateNetworkAddress(final InetAddress inetAddress)