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.Inet6Address;
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.Ipv6Address;
26 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv6Prefix;
29 * Util class for creating generated Ipv6Address.
31 public final class Ipv6Util {
35 public static final int IPV6_LENGTH = 16;
38 * Converts byte array to Inet6Address.
40 * @param bytes to be converted
41 * @return InetAddress instance
42 * @throws IllegalArgumentException if {@link UnknownHostException} is thrown.
44 private static InetAddress getAddress(final byte[] bytes) {
46 return Inet6Address.getByAddress(bytes);
47 } catch (final UnknownHostException e) {
48 throw new IllegalArgumentException("Failed to construct IPv6 address", e);
53 * Converts byte array to Ipv6Address.
55 * @param bytes to be converted to Ipv6Address
58 public static Ipv6Address addressForBytes(final byte[] bytes) {
59 return new Ipv6Address(InetAddresses.toAddrString(getAddress(bytes)));
63 * Reads from ByteBuf buffer and converts bytes to Ipv6Address.
65 * @param buffer containing Ipv6 address, starting at reader index
68 public static Ipv6Address addressForByteBuf(final ByteBuf buffer) {
69 return addressForBytes(ByteArray.readBytes(buffer, IPV6_LENGTH));
73 * Converts Ipv6Address to byte array.
75 * @param address Ipv6Address to be converted
78 public static byte[] bytesForAddress(final Ipv6Address address) {
79 final InetAddress a = InetAddresses.forString(address.getValue());
80 Preconditions.checkArgument(a instanceof Inet6Address);
81 return a.getAddress();
85 * Converts Ipv6Prefix to byte array.
87 * @param prefix Ipv6Prefix to be converted
90 public static byte[] bytesForPrefix(final Ipv6Prefix prefix) {
91 final String p = prefix.getValue();
92 final int sep = p.indexOf('/');
93 final InetAddress a = InetAddresses.forString(p.substring(0, sep));
94 Preconditions.checkArgument(a instanceof Inet6Address);
95 final byte[] bytes = a.getAddress();
96 return Bytes.concat(bytes, new byte[] { Byte.valueOf(p.substring(sep + 1, p.length())) });
100 * Converts Ipv4Prefix to byte array. Prefix length at the beginning.
101 * Prefix bytes are trimmed from the end to match prefix length.
103 * @param prefix Ipv6Prefix to be converted
104 * @return byte array with the prefix length at the beginning
106 public static byte[] bytesForPrefixBegin(final Ipv6Prefix prefix) {
107 final String p = prefix.getValue();
108 final int sep = p.indexOf('/');
109 final InetAddress a = InetAddresses.forString(p.substring(0, sep));
110 Preconditions.checkArgument(a instanceof Inet6Address);
111 final byte[] bytes = a.getAddress();
112 final int length = Ipv4Util.getPrefixLength(p);
113 return Bytes.concat(new byte[] { UnsignedBytes.checkedCast(length) }, ByteArray.subByte(bytes, 0 , Ipv4Util.getPrefixLengthBytes(p)));
117 * Creates an Ipv6Prefix object from given byte array.
119 * @param bytes IPv6 address
120 * @param length prefix length
121 * @return Ipv6Prefix object
123 public static Ipv6Prefix prefixForBytes(final byte[] bytes, final int length) {
124 Preconditions.checkArgument(length <= bytes.length * Byte.SIZE);
125 final byte[] tmp = Arrays.copyOfRange(bytes, 0, IPV6_LENGTH);
126 final InetAddress a = getAddress(tmp);
127 return new Ipv6Prefix(InetAddresses.toAddrString(a) + '/' + length);
131 * Creates a list of Ipv6 Prefixes from given byte array.
133 * @param bytes to be converted to List of Ipv6Prefixes.
134 * @return List<Ipv6Prefix>
136 public static List<Ipv6Prefix> prefixListForBytes(final byte[] bytes) {
137 if (bytes.length == 0) {
138 return Collections.emptyList();
141 final List<Ipv6Prefix> list = Lists.newArrayList();
143 while (byteOffset < bytes.length) {
144 final int bitLength = UnsignedBytes.toInt(ByteArray.subByte(bytes, byteOffset, 1)[0]);
146 final int byteCount = (bitLength % Byte.SIZE != 0) ? (bitLength / Byte.SIZE) + 1 : bitLength / Byte.SIZE;
147 list.add(prefixForBytes(ByteArray.subByte(bytes, byteOffset, byteCount), bitLength));
148 byteOffset += byteCount;