|
| 1 | +/* |
| 2 | + * The MIT License |
| 3 | + * |
| 4 | + * Copyright (c) 2013 Edin Dazdarevic (edin.dazdarevic@gmail.com) |
| 5 | + * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 6 | + * of this software and associated documentation files (the "Software"), to deal |
| 7 | + * in the Software without restriction, including without limitation the rights |
| 8 | + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 9 | + * copies of the Software, and to permit persons to whom the Software is |
| 10 | + * furnished to do so, subject to the following conditions: |
| 11 | + * The above copyright notice and this permission notice shall be included in |
| 12 | + * all copies or substantial portions of the Software. |
| 13 | + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 14 | + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 15 | + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 16 | + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 17 | + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 18 | + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 19 | + * THE SOFTWARE. |
| 20 | + * |
| 21 | + * */ |
| 22 | + |
| 23 | +package valandur.webapi.util; |
| 24 | + |
| 25 | +import java.math.BigInteger; |
| 26 | +import java.net.InetAddress; |
| 27 | +import java.net.UnknownHostException; |
| 28 | +import java.nio.ByteBuffer; |
| 29 | +import java.util.ArrayList; |
| 30 | +import java.util.List; |
| 31 | + |
| 32 | +/** |
| 33 | + * A class that enables to get an IP range from CIDR specification. It supports |
| 34 | + * both IPv4 and IPv6. |
| 35 | + */ |
| 36 | +public class CIDRAddress { |
| 37 | + private final String cidr; |
| 38 | + |
| 39 | + private InetAddress inetAddress; |
| 40 | + private InetAddress startAddress; |
| 41 | + private InetAddress endAddress; |
| 42 | + private final int prefixLength; |
| 43 | + |
| 44 | + |
| 45 | + public CIDRAddress(String cidr) throws IllegalArgumentException, UnknownHostException { |
| 46 | + this.cidr = cidr; |
| 47 | + |
| 48 | + /* split CIDR to address and prefix part */ |
| 49 | + if (this.cidr.contains("/")) { |
| 50 | + int index = this.cidr.indexOf("/"); |
| 51 | + String addressPart = this.cidr.substring(0, index); |
| 52 | + String networkPart = this.cidr.substring(index + 1); |
| 53 | + |
| 54 | + inetAddress = InetAddress.getByName(addressPart); |
| 55 | + prefixLength = Integer.parseInt(networkPart); |
| 56 | + |
| 57 | + calculate(); |
| 58 | + } else { |
| 59 | + throw new IllegalArgumentException("not an valid CIDR format!"); |
| 60 | + } |
| 61 | + } |
| 62 | + |
| 63 | + |
| 64 | + private void calculate() throws UnknownHostException { |
| 65 | + ByteBuffer maskBuffer; |
| 66 | + int targetSize; |
| 67 | + if (inetAddress.getAddress().length == 4) { |
| 68 | + maskBuffer = |
| 69 | + ByteBuffer |
| 70 | + .allocate(4) |
| 71 | + .putInt(-1); |
| 72 | + targetSize = 4; |
| 73 | + } else { |
| 74 | + maskBuffer = ByteBuffer.allocate(16) |
| 75 | + .putLong(-1L) |
| 76 | + .putLong(-1L); |
| 77 | + targetSize = 16; |
| 78 | + } |
| 79 | + |
| 80 | + BigInteger mask = (new BigInteger(1, maskBuffer.array())).not().shiftRight(prefixLength); |
| 81 | + |
| 82 | + ByteBuffer buffer = ByteBuffer.wrap(inetAddress.getAddress()); |
| 83 | + BigInteger ipVal = new BigInteger(1, buffer.array()); |
| 84 | + |
| 85 | + BigInteger startIp = ipVal.and(mask); |
| 86 | + BigInteger endIp = startIp.add(mask.not()); |
| 87 | + |
| 88 | + byte[] startIpArr = toBytes(startIp.toByteArray(), targetSize); |
| 89 | + byte[] endIpArr = toBytes(endIp.toByteArray(), targetSize); |
| 90 | + |
| 91 | + this.startAddress = InetAddress.getByAddress(startIpArr); |
| 92 | + this.endAddress = InetAddress.getByAddress(endIpArr); |
| 93 | + |
| 94 | + } |
| 95 | + |
| 96 | + private byte[] toBytes(byte[] array, int targetSize) { |
| 97 | + int counter = 0; |
| 98 | + List<Byte> newArr = new ArrayList<Byte>(); |
| 99 | + while (counter < targetSize && (array.length - 1 - counter >= 0)) { |
| 100 | + newArr.add(0, array[array.length - 1 - counter]); |
| 101 | + counter++; |
| 102 | + } |
| 103 | + |
| 104 | + int size = newArr.size(); |
| 105 | + for (int i = 0; i < (targetSize - size); i++) { |
| 106 | + |
| 107 | + newArr.add(0, (byte) 0); |
| 108 | + } |
| 109 | + |
| 110 | + byte[] ret = new byte[newArr.size()]; |
| 111 | + for (int i = 0; i < newArr.size(); i++) { |
| 112 | + ret[i] = newArr.get(i); |
| 113 | + } |
| 114 | + return ret; |
| 115 | + } |
| 116 | + |
| 117 | + public String getNetworkAddress() { |
| 118 | + return this.startAddress.getHostAddress(); |
| 119 | + } |
| 120 | + |
| 121 | + public String getBroadcastAddress() { |
| 122 | + return this.endAddress.getHostAddress(); |
| 123 | + } |
| 124 | + |
| 125 | + public boolean isInRange(String ipAddress) throws UnknownHostException { |
| 126 | + InetAddress address = InetAddress.getByName(ipAddress); |
| 127 | + BigInteger start = new BigInteger(1, this.startAddress.getAddress()); |
| 128 | + BigInteger end = new BigInteger(1, this.endAddress.getAddress()); |
| 129 | + BigInteger target = new BigInteger(1, address.getAddress()); |
| 130 | + |
| 131 | + int st = start.compareTo(target); |
| 132 | + int te = target.compareTo(end); |
| 133 | + |
| 134 | + return (st == -1 || st == 0) && (te == -1 || te == 0); |
| 135 | + } |
| 136 | +} |
0 commit comments