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;
15 import io.netty.buffer.ByteBuf;
16 import java.net.Inet6Address;
17 import java.net.InetAddress;
18 import java.net.UnknownHostException;
19 import java.util.Arrays;
20 import java.util.Collections;
21 import java.util.List;
22 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv6Address;
23 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv6Prefix;
26 * Util class for creating generated Ipv6Address.
28 public final class Ipv6Util {
32 public static final int IPV6_LENGTH = 16;
35 * Converts byte array to Inet6Address.
37 * @param bytes to be converted
38 * @return InetAddress instance
39 * @throws IllegalArgumentException if {@link UnknownHostException} is thrown.
41 private static InetAddress getAddress(final byte[] bytes) {
43 return Inet6Address.getByAddress(bytes);
44 } catch (final UnknownHostException e) {
45 throw new IllegalArgumentException("Failed to construct IPv6 address", e);
50 * Converts byte array to Ipv6Address.
52 * @param bytes to be converted to Ipv6Address
55 public static Ipv6Address addressForBytes(final byte[] bytes) {
56 return new Ipv6Address(InetAddresses.toAddrString(getAddress(bytes)));
60 * Reads from ByteBuf buffer and converts bytes to Ipv6Address.
62 * @param buffer containing Ipv6 address, starting at reader index
65 public static Ipv6Address addressForByteBuf(final ByteBuf buffer) {
66 return addressForBytes(ByteArray.readBytes(buffer, IPV6_LENGTH));
70 * Converts Ipv6Address to byte array.
72 * @param address Ipv6Address to be converted
75 public static byte[] bytesForAddress(final Ipv6Address address) {
76 final InetAddress a = InetAddresses.forString(address.getValue());
77 Preconditions.checkArgument(a instanceof Inet6Address);
78 return a.getAddress();
83 * Converts Ipv6Prefix to byte array of (prefix bit size/8) size.
85 * @param ipv6Prefix Ipv6Prefix to be converted
88 public static byte[] bytesForPrefixByPrefixLength(Ipv6Prefix ipv6Prefix) {
89 return ByteArray.subByte(Ipv6Util.bytesForPrefix(ipv6Prefix), 0,
90 Ipv4Util.getPrefixLengthBytes(ipv6Prefix.getValue()));
95 * Converts Ipv6Prefix to byte array.
97 * @param prefix Ipv6Prefix to be converted
100 public static byte[] bytesForPrefix(final Ipv6Prefix prefix) {
101 final String p = prefix.getValue();
102 final int sep = p.indexOf('/');
103 final InetAddress a = InetAddresses.forString(p.substring(0, sep));
104 Preconditions.checkArgument(a instanceof Inet6Address);
105 final byte[] bytes = a.getAddress();
106 return Bytes.concat(bytes, new byte[] { Byte.valueOf(p.substring(sep + 1, p.length())) });
110 * Creates an Ipv6Prefix object from given byte array.
112 * @param bytes IPv6 address
113 * @param length prefix length
114 * @return Ipv6Prefix object
116 public static Ipv6Prefix prefixForBytes(final byte[] bytes, final int length) {
117 Preconditions.checkArgument(length <= bytes.length * Byte.SIZE);
118 final byte[] tmp = Arrays.copyOfRange(bytes, 0, IPV6_LENGTH);
119 final InetAddress a = getAddress(tmp);
120 return new Ipv6Prefix(InetAddresses.toAddrString(a) + '/' + length);
124 * Creates a list of Ipv6 Prefixes from given byte array.
126 * @param bytes to be converted to List of Ipv6Prefixes.
127 * @return List<Ipv6Prefix>
129 public static List<Ipv6Prefix> prefixListForBytes(final byte[] bytes) {
130 if (bytes.length == 0) {
131 return Collections.emptyList();
134 final List<Ipv6Prefix> list = Lists.newArrayList();
136 while (byteOffset < bytes.length) {
137 final int bitLength = UnsignedBytes.toInt(ByteArray.subByte(bytes, byteOffset, 1)[0]);
139 final int byteCount = (bitLength % Byte.SIZE != 0) ? (bitLength / Byte.SIZE) + 1 : bitLength / Byte.SIZE;
140 list.add(prefixForBytes(ByteArray.subByte(bytes, byteOffset, byteCount), bitLength));
141 byteOffset += byteCount;