2 * Copyright (C) 2001, 2002 The Mir-coders group
4 * This file is part of Mir.
6 * Mir is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * Mir is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with Mir; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * In addition, as a special exception, The Mir-coders gives permission to link
21 * the code of this program with the com.oreilly.servlet library, any library
22 * licensed under the Apache Software License, The Sun (tm) Java Advanced
23 * Imaging library (JAI), The Sun JIMI library (or with modified versions of
24 * the above that use the same license as the above), and distribute linked
25 * combinations including the two. You must obey the GNU General Public
26 * License in all respects for all of the code used other than the above
27 * mentioned libraries. If you modify this file, you may extend this exception
28 * to your version of the file, but you are not obligated to do so. If you do
29 * not wish to do so, delete this exception statement from your version.
34 import java.util.List;
36 public class InternetFunctions {
37 private InternetFunctions() {
40 public static boolean isIpAddressInNetwork(String anIpAddress, String aNetwork) throws Exception {
41 long ipAddress = parseIPAddress(anIpAddress);
43 long netMask = (1L<<32)-1;
44 List networkParts = StringRoutines.separateString(aNetwork, "/");
46 network = parseIPAddress((String) networkParts.get(0));
47 if (networkParts.size()>=2) {
48 netMask=parseNetmask((String) networkParts.get(1));
51 return (ipAddress & netMask ) == (network & netMask);
54 public static long parseIPAddress(String anIpAddress) throws Exception {
55 int[] parts = {0,0,0,0};
58 List stringParts = StringRoutines.splitString(anIpAddress, ".");
60 if (stringParts.size()!=4)
61 throw new Exception("Not a valid IP Address: " + anIpAddress);
65 parts[i] = Integer.parseInt((String) stringParts.get(i));
69 throw new Exception("Not a valid IP Address: " + anIpAddress);
72 if (parts[i]<0 || parts[i]>255)
73 throw new Exception("Not a valid IP Address: " + anIpAddress);
76 return parts[0]<<24 | parts[1]<<16 | parts[2]<<8 | parts[3];
79 public static long parseNetmask(String anIpAddress) throws Exception {
81 return parseIPAddress(anIpAddress);
87 int size = Integer.parseInt(anIpAddress);
90 return ((1L<<size)-1)<<(32-size);