mirror of https://github.com/webbukkit/dynmap.git
101 lines
3.2 KiB
Java
101 lines
3.2 KiB
Java
package org.dynmap.utils;
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/*
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* Copyright 2002-2019 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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/**
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* Matches a request based on IP Address or subnet mask matching against the remote
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* address.
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* <p>
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* Both IPv6 and IPv4 addresses are supported, but a matcher which is configured with an
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* IPv4 address will never match a request which returns an IPv6 address, and vice-versa.
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*
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* @author Luke Taylor
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* @since 3.0.2
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*
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* Slightly modified by omidzk to have zero dependency to any frameworks other than the JRE.
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*/
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public final class IpAddressMatcher {
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private final int nMaskBits;
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private final InetAddress requiredAddress;
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/**
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* Takes a specific IP address or a range specified using the IP/Netmask (e.g.
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* 192.168.1.0/24 or 202.24.0.0/14).
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*
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* @param ipAddress the address or range of addresses from which the request must
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* come.
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*/
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public IpAddressMatcher(String ipAddress) {
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if (ipAddress.indexOf('/') > 0) {
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String[] addressAndMask = ipAddress.split("/");
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ipAddress = addressAndMask[0];
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nMaskBits = Integer.parseInt(addressAndMask[1]);
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}
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else {
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nMaskBits = -1;
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}
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requiredAddress = parseAddress(ipAddress);
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assert (requiredAddress.getAddress().length * 8 >= nMaskBits) :
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String.format("IP address %s is too short for bitmask of length %d",
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ipAddress, nMaskBits);
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}
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public boolean matches(String address) {
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InetAddress remoteAddress = parseAddress(address);
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if (!requiredAddress.getClass().equals(remoteAddress.getClass())) {
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return false;
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}
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if (nMaskBits < 0) {
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return remoteAddress.equals(requiredAddress);
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}
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byte[] remAddr = remoteAddress.getAddress();
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byte[] reqAddr = requiredAddress.getAddress();
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int nMaskFullBytes = nMaskBits / 8;
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byte finalByte = (byte) (0xFF00 >> (nMaskBits & 0x07));
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// System.out.println("Mask is " + new sun.misc.HexDumpEncoder().encode(mask));
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for (int i = 0; i < nMaskFullBytes; i++) {
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if (remAddr[i] != reqAddr[i]) {
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return false;
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}
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}
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if (finalByte != 0) {
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return (remAddr[nMaskFullBytes] & finalByte) == (reqAddr[nMaskFullBytes] & finalByte);
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}
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return true;
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}
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private InetAddress parseAddress(String address) {
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try {
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return InetAddress.getByName(address);
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}
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catch (UnknownHostException e) {
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throw new IllegalArgumentException("Failed to parse address" + address, e);
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}
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}
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}
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