
org.reaktivity.nukleus.tcp.internal.util.CIDR Maven / Gradle / Ivy
/**
* Copyright 2016-2019 The Reaktivity Project
*
* The Reaktivity Project licenses this file to you 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.
*/
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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
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*/
package org.reaktivity.nukleus.tcp.internal.util;
import static java.lang.Integer.parseInt;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class CIDR
{
private static final long LARGEST_IPV4 = 0xFFFFFFFFL;
private static final String IP_ADDRESS = "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})";
private static final String SLASH_FORMAT = IP_ADDRESS + "/(\\d{1,3})";
private static final Pattern ADDRESS_PATTERN = Pattern.compile(IP_ADDRESS);
private static final Pattern CIDR_PATTERN = Pattern.compile(SLASH_FORMAT);
private final long low;
private final long high;
public CIDR(String cidrNotation)
{
final Matcher matcher = CIDR_PATTERN.matcher(cidrNotation);
if (matcher.matches())
{
final long address = matchAddress(matcher);
final int cidrPart = Integer.parseInt(matcher.group(5));
final int netmask = cidrPart == 0 ? 0 : -1 << (32 - cidrPart);
final long network = address & netmask;
final long broadcast = network | ~netmask;
low = network;
high = broadcast == -1 ? LARGEST_IPV4 : broadcast;
}
else
{
throw new IllegalArgumentException("Could not parse [" + cidrNotation + "]");
}
}
public boolean isInRange(String address)
{
final long addr = toLong(address);
return high >= addr && addr >= low;
}
private long toLong(String address)
{
final Matcher matcher = ADDRESS_PATTERN.matcher(address);
if (matcher.matches())
{
return matchAddress(matcher);
}
else
{
throw new IllegalArgumentException("Could not parse [" + address + "]");
}
}
private long matchAddress(Matcher matcher)
{
long addr = 0;
for (int i = 1; i <= 4; ++i)
{
int n = parseInt(matcher.group(i));
addr = addr << 8;
addr |= n & 0xff;
}
return addr;
}
}
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