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.Inet4Address;
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.IpPrefix;
23 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv4Address;
24 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv4Prefix;
27 * Util class for creating generated Ipv4Address.
29 public final class Ipv4Util {
34 public static final int IP4_LENGTH = 4;
37 * Converts byte array to Inet4Address.
39 * @param bytes to be converted
40 * @return InetAddress instance
41 * @throws IllegalArgumentException if {@link UnknownHostException} is thrown.
43 private static InetAddress getAddress(final byte[] bytes) {
45 return Inet4Address.getByAddress(bytes);
46 } catch (final UnknownHostException e) {
47 throw new IllegalArgumentException("Failed to construct IPv4 address", e);
52 * Converts byte array to Ipv4Address.
54 * @param bytes to be converted to Ipv4Address
57 public static Ipv4Address addressForBytes(final byte[] bytes) {
58 return new Ipv4Address(InetAddresses.toAddrString(getAddress(bytes)));
62 * Reads from ByteBuf buffer and converts bytes to Ipv4Address.
64 * @param buffer containing Ipv4 address, starting at reader index
67 public static Ipv4Address addressForByteBuf(final ByteBuf buffer) {
68 return addressForBytes(ByteArray.readBytes(buffer, IP4_LENGTH));
72 * Converts Ipv4Address to byte array.
74 * @param address Ipv4Address to be converted
77 public static byte[] bytesForAddress(final Ipv4Address address) {
78 final InetAddress a = InetAddresses.forString(address.getValue());
79 Preconditions.checkArgument(a instanceof Inet4Address);
80 return a.getAddress();
84 * Returns number of minimum bytes needed to cover all bits of prefix.
89 public static int getPrefixLengthBytes(final String prefix) {
90 int bits = Ipv4Util.getPrefixLength(prefix);
92 return (bits / 8) + 1;
98 * Converts Ipv4Prefix to byte array of length equal to prefix length value.
100 * @param ipv4Prefix Ipv4Prefix to be converted
103 public static byte[] bytesForPrefixByPrefixLength(Ipv4Prefix ipv4Prefix) {
104 return ByteArray.subByte(bytesForPrefix(ipv4Prefix), 0,
105 getPrefixLengthBytes(ipv4Prefix.getValue()));
109 * Converts Ipv4Prefix to byte array.
111 * @param prefix Ipv4Prefix to be converted
114 public static byte[] bytesForPrefix(final Ipv4Prefix prefix) {
115 final String p = prefix.getValue();
116 final int sep = p.indexOf('/');
117 final InetAddress a = InetAddresses.forString(p.substring(0, sep));
118 Preconditions.checkArgument(a instanceof Inet4Address);
119 final byte[] bytes = a.getAddress();
120 return Bytes.concat(bytes, new byte[] { Byte.valueOf(p.substring(sep + 1, p.length())) });
124 * Creates an Ipv4Prefix object from given byte array.
126 * @param bytes IPv4 address
127 * @param length prefix length
128 * @return Ipv4Prefix object
130 public static Ipv4Prefix prefixForBytes(final byte[] bytes, final int length) {
131 Preconditions.checkArgument(length <= bytes.length * Byte.SIZE);
132 final byte[] tmp = Arrays.copyOfRange(bytes, 0, IP4_LENGTH);
133 final InetAddress a = getAddress(tmp);
134 return new Ipv4Prefix(InetAddresses.toAddrString(a) + '/' + length);
138 * Creates a list of Ipv4 Prefixes from given byte array.
140 * @param bytes to be converted to List of Ipv4Prefixes.
141 * @return List<Ipv4Prefix>
143 public static List<Ipv4Prefix> prefixListForBytes(final byte[] bytes) {
144 if (bytes.length == 0) {
145 return Collections.emptyList();
147 final List<Ipv4Prefix> list = Lists.newArrayList();
149 while (byteOffset < bytes.length) {
150 final int bitLength = UnsignedBytes.toInt(ByteArray.subByte(bytes, byteOffset, 1)[0]);
152 final int byteCount = (bitLength % Byte.SIZE != 0) ? (bitLength / Byte.SIZE) + 1 : bitLength / Byte.SIZE;
153 list.add(prefixForBytes(ByteArray.subByte(bytes, byteOffset, byteCount), bitLength));
154 byteOffset += byteCount;
160 * Obtains prefix length from given prefix.
163 * @return prefix length
165 public static int getPrefixLength(final IpPrefix prefix) {
167 if (prefix.getIpv4Prefix() != null) {
168 p = prefix.getIpv4Prefix().getValue();
170 p = prefix.getIpv6Prefix().getValue();
172 return getPrefixLength(p);
176 * Obtains prefix length from given prefix.
178 * @param prefixValue value of prefix
179 * @return prefix length
181 public static int getPrefixLength(final String prefixValue) {
182 final int sep = prefixValue.indexOf('/');
183 return Integer.valueOf(prefixValue.substring(sep + 1, prefixValue.length()));