2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.protocol.util;
10 import com.google.common.base.Preconditions;
11 import com.google.common.collect.Lists;
12 import com.google.common.net.InetAddresses;
13 import com.google.common.primitives.Bytes;
14 import com.google.common.primitives.UnsignedBytes;
16 import io.netty.buffer.ByteBuf;
18 import java.net.Inet4Address;
19 import java.net.InetAddress;
20 import java.net.UnknownHostException;
21 import java.util.Arrays;
22 import java.util.Collections;
23 import java.util.List;
25 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpPrefix;
26 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv4Address;
27 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv4Prefix;
30 * Util class for creating generated Ipv4Address.
32 public final class Ipv4Util {
37 public static final int IP4_LENGTH = 4;
40 * Converts byte array to Inet4Address.
42 * @param bytes to be converted
43 * @return InetAddress instance
44 * @throws IllegalArgumentException if {@link UnknownHostException} is thrown.
46 private static InetAddress getAddress(final byte[] bytes) {
48 return Inet4Address.getByAddress(bytes);
49 } catch (final UnknownHostException e) {
50 throw new IllegalArgumentException("Failed to construct IPv4 address", e);
55 * Converts byte array to Ipv4Address.
57 * @param bytes to be converted to Ipv4Address
60 public static Ipv4Address addressForBytes(final byte[] bytes) {
61 return new Ipv4Address(InetAddresses.toAddrString(getAddress(bytes)));
65 * Reads from ByteBuf buffer and converts bytes to Ipv4Address.
67 * @param buffer containing Ipv4 address, starting at reader index
70 public static Ipv4Address addressForByteBuf(final ByteBuf buffer) {
71 return addressForBytes(ByteArray.readBytes(buffer, IP4_LENGTH));
75 * Converts Ipv4Address to byte array.
77 * @param address Ipv4Address to be converted
80 public static byte[] bytesForAddress(final Ipv4Address address) {
81 final InetAddress a = InetAddresses.forString(address.getValue());
82 Preconditions.checkArgument(a instanceof Inet4Address);
83 return a.getAddress();
87 * Returns number of minimum bytes needed to cover all bits of prefix.
92 public static int getPrefixLengthBytes(final String prefix) {
93 int bits = Ipv4Util.getPrefixLength(prefix);
95 return (bits / 8) + 1;
101 * Converts Ipv4Prefix to byte array of length equal to prefix length value.
103 * @param ipv4Prefix Ipv4Prefix to be converted
106 public static byte[] bytesForPrefixByPrefixLength(Ipv4Prefix ipv4Prefix) {
107 return ByteArray.subByte(bytesForPrefix(ipv4Prefix), 0,
108 getPrefixLengthBytes(ipv4Prefix.getValue()));
112 * Converts Ipv4Prefix to byte array. Prefix length at the end.
114 * @param prefix Ipv4Prefix to be converted
115 * @return byte array with prefix length at the end
117 public static byte[] bytesForPrefix(final Ipv4Prefix prefix) {
118 final String p = prefix.getValue();
119 final int sep = p.indexOf('/');
120 final InetAddress a = InetAddresses.forString(p.substring(0, sep));
121 Preconditions.checkArgument(a instanceof Inet4Address);
122 final byte[] bytes = a.getAddress();
123 return Bytes.concat(bytes, new byte[] { Byte.valueOf(p.substring(sep + 1, p.length())) });
127 * Converts Ipv4Prefix to byte array. Prefix length at the beginning.
128 * Prefix bytes are trimmed from the end to match prefix length.
130 * @param prefix Ipv4Prefix to be converted
131 * @return byte array with the prefix length at the beginning
133 public static byte[] bytesForPrefixBegin(final Ipv4Prefix prefix) {
134 final String p = prefix.getValue();
135 final int sep = p.indexOf('/');
136 final InetAddress a = InetAddresses.forString(p.substring(0, sep));
137 Preconditions.checkArgument(a instanceof Inet4Address);
138 final byte[] bytes = a.getAddress();
139 final int length = getPrefixLength(p);
140 return Bytes.concat(new byte[] { UnsignedBytes.checkedCast(length) }, ByteArray.subByte(bytes, 0 , getPrefixLengthBytes(p)));
144 * Creates an Ipv4Prefix object from given byte array.
146 * @param bytes IPv4 address
147 * @param length prefix length
148 * @return Ipv4Prefix object
150 public static Ipv4Prefix prefixForBytes(final byte[] bytes, final int length) {
151 Preconditions.checkArgument(length <= bytes.length * Byte.SIZE);
152 final byte[] tmp = Arrays.copyOfRange(bytes, 0, IP4_LENGTH);
153 final InetAddress a = getAddress(tmp);
154 return new Ipv4Prefix(InetAddresses.toAddrString(a) + '/' + length);
158 * Creates a list of Ipv4 Prefixes from given byte array.
160 * @param bytes to be converted to List of Ipv4Prefixes.
161 * @return List<Ipv4Prefix>
163 public static List<Ipv4Prefix> prefixListForBytes(final byte[] bytes) {
164 if (bytes.length == 0) {
165 return Collections.emptyList();
167 final List<Ipv4Prefix> list = Lists.newArrayList();
169 while (byteOffset < bytes.length) {
170 final int bitLength = UnsignedBytes.toInt(ByteArray.subByte(bytes, byteOffset, 1)[0]);
172 final int byteCount = (bitLength % Byte.SIZE != 0) ? (bitLength / Byte.SIZE) + 1 : bitLength / Byte.SIZE;
173 list.add(prefixForBytes(ByteArray.subByte(bytes, byteOffset, byteCount), bitLength));
174 byteOffset += byteCount;
180 * Obtains prefix length from given prefix.
183 * @return prefix length
185 public static int getPrefixLength(final IpPrefix prefix) {
187 if (prefix.getIpv4Prefix() != null) {
188 p = prefix.getIpv4Prefix().getValue();
190 p = prefix.getIpv6Prefix().getValue();
192 return getPrefixLength(p);
196 * Obtains prefix length from given string prefix.
198 * @param prefixValue value of prefix
199 * @return prefix length
201 public static int getPrefixLength(final String prefixValue) {
202 final int sep = prefixValue.indexOf('/');
203 return Integer.valueOf(prefixValue.substring(sep + 1, prefixValue.length()));