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/*
* The MIT License
*
* Copyright (c) 2013 Edin Dazdarevic (edin.dazdarevic@gmail.com)
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* */
package edazdarevic.commons.net;
import java.math.BigInteger;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
/**
* A class that enables to get an IP range from CIDR specification. It supports
* both IPv4 and IPv6.
*/
public class CIDRUtils {
private final String cidr;
private InetAddress inetAddress;
private InetAddress startAddress;
private InetAddress endAddress;
private final int prefixLength;
public CIDRUtils(String cidr) throws UnknownHostException {
this.cidr = cidr;
/* split CIDR to address and prefix part */
if (this.cidr.contains("/")) {
int index = this.cidr.indexOf("/");
String addressPart = this.cidr.substring(0, index);
String networkPart = this.cidr.substring(index + 1);
inetAddress = InetAddress.getByName(addressPart);
prefixLength = Integer.parseInt(networkPart);
calculate();
} else {
throw new IllegalArgumentException("not an valid CIDR format!");
}
}
private void calculate() throws UnknownHostException {
ByteBuffer maskBuffer;
int targetSize;
if (inetAddress.getAddress().length == 4) {
maskBuffer =
ByteBuffer
.allocate(4)
.putInt(-1);
targetSize = 4;
} else {
maskBuffer = ByteBuffer.allocate(16)
.putLong(-1L)
.putLong(-1L);
targetSize = 16;
}
BigInteger mask = (new BigInteger(1, maskBuffer.array())).not().shiftRight(prefixLength);
ByteBuffer buffer = ByteBuffer.wrap(inetAddress.getAddress());
BigInteger ipVal = new BigInteger(1, buffer.array());
BigInteger startIp = ipVal.and(mask);
BigInteger endIp = startIp.add(mask.not());
byte[] startIpArr = toBytes(startIp.toByteArray(), targetSize);
byte[] endIpArr = toBytes(endIp.toByteArray(), targetSize);
this.startAddress = InetAddress.getByAddress(startIpArr);
this.endAddress = InetAddress.getByAddress(endIpArr);
}
private byte[] toBytes(byte[] array, int targetSize) {
int counter = 0;
List<Byte> newArr = new ArrayList<Byte>();
while (counter < targetSize && (array.length - 1 - counter >= 0)) {
newArr.add(0, array[array.length - 1 - counter]);
counter++;
}
int size = newArr.size();
for (int i = 0; i < (targetSize - size); i++) {
newArr.add(0, (byte) 0);
}
byte[] ret = new byte[newArr.size()];
for (int i = 0; i < newArr.size(); i++) {
ret[i] = newArr.get(i);
}
return ret;
}
public String getNetworkAddress() {
return this.startAddress.getHostAddress();
}
public String getBroadcastAddress() {
return this.endAddress.getHostAddress();
}
public boolean isInRange(String ipAddress) throws UnknownHostException {
InetAddress address = InetAddress.getByName(ipAddress);
BigInteger start = new BigInteger(1, this.startAddress.getAddress());
BigInteger end = new BigInteger(1, this.endAddress.getAddress());
BigInteger target = new BigInteger(1, address.getAddress());
int st = start.compareTo(target);
int te = target.compareTo(end);
return (st == -1 || st == 0) && (te == -1 || te == 0);
}
}
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