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/*
* Copyright © 2017-2018 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.config;
import java.net.Inet4Address;
import java.net.InetAddress;
/**
* An Internet network, denoted by its address and netmask
* <p>
* Instances of this class are immutable.
*/
public final class InetNetwork {
private final InetAddress address;
private final int mask;
private InetNetwork(final InetAddress address, final int mask) {
this.address = address;
this.mask = mask;
}
public static InetNetwork parse(final String network) throws ParseException {
final int slash = network.lastIndexOf('/');
final String maskString;
final int rawMask;
final String rawAddress;
if (slash >= 0) {
maskString = network.substring(slash + 1);
try {
rawMask = Integer.parseInt(maskString, 10);
} catch (final NumberFormatException ignored) {
throw new ParseException(Integer.class, maskString);
}
rawAddress = network.substring(0, slash);
} else {
maskString = "";
rawMask = -1;
rawAddress = network;
}
final InetAddress address = InetAddresses.parse(rawAddress);
final int maxMask = (address instanceof Inet4Address) ? 32 : 128;
if (rawMask > maxMask)
throw new ParseException(InetNetwork.class, maskString, "Invalid network mask");
final int mask = rawMask >= 0 && rawMask <= maxMask ? rawMask : maxMask;
return new InetNetwork(address, mask);
}
@Override
public boolean equals(final Object obj) {
if (!(obj instanceof InetNetwork))
return false;
final InetNetwork other = (InetNetwork) obj;
return address.equals(other.address) && mask == other.mask;
}
public InetAddress getAddress() {
return address;
}
public int getMask() {
return mask;
}
@Override
public int hashCode() {
return address.hashCode() ^ mask;
}
@Override
public String toString() {
return address.getHostAddress() + '/' + mask;
}
}
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