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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| /* | ||
| * Copyright (c) 2002-2025 Gargoyle Software Inc. | ||
| * | ||
| * 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 | ||
| * https://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 org.htmlunit.util; | ||
|
|
||
| import java.util.regex.Matcher; | ||
| import java.util.regex.Pattern; | ||
|
|
||
| /** | ||
| * Performs subnet calculations given a network address and a subnet mask. | ||
| * Inspired by org.apache.commons.net.util.SubnetUtils. | ||
| * | ||
| * @see "http://www.faqs.org/rfcs/rfc1519.html" | ||
| * | ||
| * @author Ronald Brill | ||
| */ | ||
| public class SubnetUtils { | ||
|
|
||
| private static final String IP_ADDRESS = "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})"; | ||
| private static final Pattern ADDRESS_PATTERN = Pattern.compile(IP_ADDRESS); | ||
| private static final String PARSE_FAIL = "Could not parse [%s]"; | ||
| private static final long UNSIGNED_INT_MASK = 0x0FFFFFFFFL; | ||
|
|
||
| private final int netmask_; | ||
| private final int address_; | ||
| private final int network_; | ||
| private final int broadcast_; | ||
|
|
||
| /** | ||
| * Constructs an instance from a dotted decimal address and a dotted decimal mask. | ||
| * | ||
| * @param address An IP address, e.g. "192.168.0.1" | ||
| * @param mask A dotted decimal netmask e.g. "255.255.0.0" | ||
| * @throws IllegalArgumentException if the address or mask is invalid, i.e. does not match n.n.n.n where n=1-3 decimal digits and the mask is not all zeros | ||
| */ | ||
| public SubnetUtils(final String address, final String mask) { | ||
| address_ = toInteger(address); | ||
| netmask_ = toInteger(mask); | ||
|
|
||
| if ((netmask_ & -netmask_) - 1 != ~netmask_) { | ||
| throw new IllegalArgumentException(String.format(PARSE_FAIL, mask)); | ||
| } | ||
|
|
||
| network_ = address_ & netmask_; | ||
| broadcast_ = network_ | ~netmask_; | ||
| } | ||
|
|
||
| /* | ||
| * Extracts the components of a dotted decimal address and pack into an integer using a regex match | ||
| */ | ||
| private static int matchAddress(final Matcher matcher) { | ||
| int addr = 0; | ||
| for (int i = 1; i <= 4; ++i) { | ||
| final int n = rangeCheck(Integer.parseInt(matcher.group(i)), 0, 255); | ||
| addr |= (n & 0xff) << 8 * (4 - i); | ||
| } | ||
| return addr; | ||
| } | ||
|
|
||
| /* | ||
| * Checks integer boundaries. Checks if a value x is in the range [begin,end]. Returns x if it is in range, throws an exception otherwise. | ||
| */ | ||
| private static int rangeCheck(final int value, final int begin, final int end) { | ||
| // (begin,end] | ||
| if (value >= begin && value <= end) { | ||
| return value; | ||
| } | ||
| throw new IllegalArgumentException("Value [" + value + "] not in range [" + begin + "," + end + "]"); | ||
| } | ||
|
|
||
| /* | ||
| * Converts a dotted decimal format address to a packed integer format | ||
| */ | ||
| private static int toInteger(final String address) { | ||
| final Matcher matcher = ADDRESS_PATTERN.matcher(address); | ||
| if (matcher.matches()) { | ||
| return matchAddress(matcher); | ||
| } | ||
| throw new IllegalArgumentException(String.format(PARSE_FAIL, address)); | ||
| } | ||
|
|
||
| private long broadcastLong() { | ||
| return broadcast_ & UNSIGNED_INT_MASK; | ||
| } | ||
|
|
||
| private int high() { | ||
| return broadcastLong() - networkLong() > 1 ? broadcast_ - 1 : 0; | ||
| } | ||
|
|
||
| private int low() { | ||
| return broadcastLong() - networkLong() > 1 ? network_ + 1 : 0; | ||
| } | ||
|
|
||
| /** Long versions of the values (as unsigned int) which are more suitable for range checking. */ | ||
| private long networkLong() { | ||
| return network_ & UNSIGNED_INT_MASK; | ||
| } | ||
|
|
||
| /** | ||
| * Tests if the parameter <code>address</code> is in the range of usable endpoint addresses for this subnet. This excludes the network and broadcast | ||
| * addresses by default. Use {@link SubnetUtils#setInclusiveHostCount(boolean)} to change this. | ||
| * | ||
| * @param address the address to check | ||
| * @return true if it is in range | ||
| */ | ||
| private boolean isInRange(final int address) { | ||
| if (address == 0) { | ||
| return false; | ||
| } | ||
| final long addLong = address & UNSIGNED_INT_MASK; | ||
| final long lowLong = low() & UNSIGNED_INT_MASK; | ||
| final long highLong = high() & UNSIGNED_INT_MASK; | ||
| return addLong >= lowLong && addLong <= highLong; | ||
| } | ||
|
|
||
| /** | ||
| * Tests if the parameter <code>address</code> is in the range of usable endpoint addresses for this subnet. This excludes the network and broadcast | ||
| * addresses. Use {@link SubnetUtils#setInclusiveHostCount(boolean)} to change this. | ||
| * | ||
| * @param address A dot-delimited IPv4 address, e.g. "192.168.0.1" | ||
| * @return true if in range, false otherwise | ||
| */ | ||
| public boolean isInRange(final String address) { | ||
| return isInRange(toInteger(address)); | ||
| } | ||
| } |
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