com.predic8.membrane.core.interceptor.acl.matchers.Cidr.IpRange Maven / Gradle / Ivy
/* Copyright 2023 predic8 GmbH, www.predic8.com
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. */
package com.predic8.membrane.core.interceptor.acl.matchers.Cidr;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
public class IpRange {
private final int networkAddress;
private final int broadcastAddress;
private IpRange(int networkAddress, int broadcastAddress) {
this.networkAddress = networkAddress;
this.broadcastAddress = broadcastAddress;
}
public static IpRange fromCidr(String schema) throws UnknownHostException {
String[] parts = schema.split("/");
InetAddress cidrAddress = InetAddress.getByName(parts[0]);
int prefixLength = Integer.parseInt(parts[1]);
if (cidrAddress.getAddress().length != 4) {
throw new IllegalArgumentException("Only IPv4 addresses are supported");
}
int mask = getMask(prefixLength);
int networkAddress = getIntegerValue(cidrAddress.getAddress()) & mask;
int broadcastAddress = networkAddress | ~mask;
return new IpRange(networkAddress, broadcastAddress);
}
public boolean contains(String ipAddress) throws UnknownHostException {
byte[] addressBytes = InetAddress.getByName(ipAddress).getAddress();
int addressInt = getIntegerValue(addressBytes);
return addressInt >= this.networkAddress && addressInt <= this.broadcastAddress;
}
static int getMask(int prefixLength) {
return prefixLength == 0 ? 0 : ~0 << (32 - prefixLength);
}
static int getIntegerValue(byte[] addressBytes) {
return ByteBuffer.wrap(addressBytes).getInt();
}
}