puzzlecracker ha escrito:

First of all, you may find the following static function useful:

  public static int aton(InetAddress ia) {
     if (ia==null) return 0;
     if (ia instanceof Inet4Address) {
    byte[] a = ia.getAddress();
    return ((a[0]<<24)
        + ((a[1]&0xFF)<<16)
        + ((a[2]&0xFF)<<8)
        +  (a[3]&0xFF)     );
     } else {
           /* (it's an IPv6 address...return '0' or throw an error or
whatever) */
}}

Given that function,  you could check for such conditions with
expressions like

  ( ntoa(socket.getSocketAddress().getAddress())
    & ntoa(new Inet4Address("255.0.0.0") ) == new
Inet4Address("160.0.0.0")

If you just want to determine if an address is "loopback" or
"multicast",  you should probably use InetAddress.isLoopbackAddress()
and InetAddress.isMulticastAddress() instead.

--
DLL

why aren't you implementing that type filter on the network itself
instead of in the application?  IP filtering is the job of the network
or at least of software meant to manage that type of thing.

Far easier to use something like iptables to accomplish this.  I'm sure that
the apache webserver also has some way to permit/deny connections from
specified hosts, but am not an apache expert.

Why reinvent the wheel?

Cheers
GRB