Java InetAddress Check isValidAddress(InetAddress i, boolean includeLocalAddressesInNoderefs)

Description

is Valid Address

License

GNU General Public License

Parameter

Parameter	Description
i	a parameter
includeLocalAddressesInNoderefs	a parameter

Declaration

public static boolean isValidAddress(InetAddress i, boolean includeLocalAddressesInNoderefs) 

Method Source Code

//package com.java2s;
/* This code is part of Freenet. It is distributed under the GNU General
 * Public License, version 2 (or at your option any later version). See
 * http://www.gnu.org/ for further details of the GPL. */

import java.net.InetAddress;
import java.net.Inet6Address;

public class Main {
    /**//from  ww w .  j a  va2  s .  com
     *
     * @param i
     * @param includeLocalAddressesInNoderefs
     * @return
     */
    public static boolean isValidAddress(InetAddress i, boolean includeLocalAddressesInNoderefs) {
        if (i.isAnyLocalAddress()) {
            // Wildcard address, 0.0.0.0, ignore.
            return false;
        } else if (i.isLinkLocalAddress() || i.isLoopbackAddress() || isSiteLocalAddress(i)) {
            if (includeLocalAddressesInNoderefs) {
                return true;
            } else
                return false;
        } else if (i.isMulticastAddress()) {
            // Ignore
            return false;
        } else {
            byte[] ipAddressBytes = i.getAddress();
            if (ipAddressBytes.length == 4 && ipAddressBytes[0] == 0) {
                return false; // First octet of IPv4 address cannot be zero as 0.0.0.0/8 has been reserved since at least RFC790 (also, Java throws an IOException when they're used)
            }
            return true;
        }
    }

    /** Check if address is in site-local range.
     * [Oracle|Open]JDK up to 8 contains obsolete check for site-local ipv6
     * addresses, this repaces it with correct one.
     */
    public static boolean isSiteLocalAddress(InetAddress i) {
        if (i instanceof Inet6Address) {
            byte[] addr = i.getAddress();
            assert (addr.length == 128 / 8);
            // XXX what about ipv6-mapped ipv4 site-local addresses?
            // (weird/insane/not-sure-if-possible-but)
            /*
            try {
               if(addr[0] == (byte)0x20 && addr[1] == (byte)0x02) {
              // 2002::/16, 6to4 tunnels
              return InetAddress.getByAddress(
              Arrays.copyOfRange(addr,2,6)).isSiteLocalAddress();
               }
               if(addr[ 0] == (byte)0 && addr[ 1] == (byte)0 &&
              addr[ 2] == (byte)0 && addr[ 3] == (byte)0 &&
              addr[ 4] == (byte)0 && addr[ 5] == (byte)0 &&
              addr[ 6] == (byte)0 && addr[ 7] == (byte)0 &&
              addr[ 8] == (byte)0 && addr[ 9] == (byte)0 &&
              addr[10] == (byte)0 && addr[11] == (byte)0) {
              // ::/96, ipv4-compatible ipv6 addresses
              // [DEPRECATED by 2002::/16, probably not worth checking]
              return InetAddress.getByAddress(
              Arrays.copyOfRange(addr,12,16)).isSiteLocalAddress();
               }
            } catch(UnknownHostException e) {
               return false; // impossible
            }
            */
            return ((addr[0] & (byte) 0xfe) == (byte) 0xfc
            /* unique local: fc00::/7 */) || (addr[0] == (byte) 0xfe && (addr[1] & (byte) 0xc0) == (byte) 0xc0
            /* DEPRECATED site local: 0xfec0::/10 */);
        }
        return i.isSiteLocalAddress();
    }
}

Related

1. isThisMyIpAddress(InetAddress addr)
2. isUDPPortFree(int port, InetAddress addr)
3. isUnicastAddress(@CheckForNull InetAddress address)
4. isValidAddress(InetAddress address, int timeoutMs)
5. isValidAddress(InetAddress i, boolean includeLocalAddressesInNoderefs)
6. isValidCiscoWildcard(InetAddress wildcard)
7. isValidInetAddress(String address)
8. isValidInetAddress(String IP)
9. isValidInetAddress(String ip)