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/*******************************************************************************
* ============LICENSE_START==================================================
* * org.onap.dmaap
* * ===========================================================================
* * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* * ===========================================================================
* * Licensed under the Apache License, Version 2.0 (the "License");
* * you may not use this file except in compliance with the License.
* * You may obtain a copy of the License at
* *
* * http://www.apache.org/licenses/LICENSE-2.0
* *
* * Unless required by applicable law or agreed to in writing, software
* * distributed under the License is distributed on an "AS IS" BASIS,
* * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* * See the License for the specific language governing permissions and
* * limitations under the License.
* * ============LICENSE_END====================================================
* *
* * ECOMP is a trademark and service mark of AT&T Intellectual Property.
* *
******************************************************************************/
package org.onap.dmaap.datarouter.node;
/**
* Compare IP addresses as byte arrays to a subnet specified as a CIDR.
*/
public class SubnetMatcher {
private byte[] sn;
private int len;
private int mask;
/**
* Construct a subnet matcher given a CIDR.
*
* @param subnet The CIDR to match
*/
public SubnetMatcher(String subnet) {
int index = subnet.lastIndexOf('/');
if (index == -1) {
sn = NodeUtils.getInetAddress(subnet);
len = sn.length;
} else {
len = Integer.parseInt(subnet.substring(index + 1));
sn = NodeUtils.getInetAddress(subnet.substring(0, index));
mask = ((0xff00) >> (len % 8)) & 0xff;
len /= 8;
}
}
/**
* Is the IP address in the CIDR.
*
* @param addr the IP address as bytes in network byte order
* @return true if the IP address matches.
*/
public boolean matches(byte[] addr) {
if (addr.length != sn.length) {
return (false);
}
for (int i = 0; i < len; i++) {
if (addr[i] != sn[i]) {
return (false);
}
}
if (mask != 0 && ((addr[len] ^ sn[len]) & mask) != 0) {
return (false);
}
return (true);
}
}
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