1 /*******************************************************************************
2 * ============LICENSE_START==================================================
4 * * ===========================================================================
5 * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
6 * * ===========================================================================
7 * * Licensed under the Apache License, Version 2.0 (the "License");
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16 * * See the License for the specific language governing permissions and
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18 * * ============LICENSE_END====================================================
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22 ******************************************************************************/
25 package org.onap.dmaap.datarouter.node;
28 * Compare IP addresses as byte arrays to a subnet specified as a CIDR.
30 public class SubnetMatcher {
37 * Construct a subnet matcher given a CIDR.
39 * @param subnet The CIDR to match
41 public SubnetMatcher(String subnet) {
42 int index = subnet.lastIndexOf('/');
44 sn = NodeUtils.getInetAddress(subnet);
47 len = Integer.parseInt(subnet.substring(index + 1));
48 sn = NodeUtils.getInetAddress(subnet.substring(0, index));
49 mask = ((0xff00) >> (len % 8)) & 0xff;
55 * Is the IP address in the CIDR.
57 * @param addr the IP address as bytes in network byte order
58 * @return true if the IP address matches.
60 public boolean matches(byte[] addr) {
61 if (addr.length != sn.length) {
64 for (int i = 0; i < len; i++) {
65 if (addr[i] != sn[i]) {
69 if (mask != 0 && ((addr[len] ^ sn[len]) & mask) != 0) {