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1   /*
2    * Copyright 2016 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.handler.codec.dns;
17  
18  import io.netty.channel.socket.InternetProtocolFamily;
19  
20  import java.net.InetAddress;
21  import java.util.Arrays;
22  
23  /**
24   * Default {@link DnsOptEcsRecord} implementation.
25   */
26  public final class DefaultDnsOptEcsRecord extends AbstractDnsOptPseudoRrRecord implements DnsOptEcsRecord {
27      private final int srcPrefixLength;
28      private final byte[] address;
29  
30      /**
31       * Creates a new instance.
32       *
33       * @param maxPayloadSize the suggested max payload size in bytes
34       * @param extendedRcode the extended rcode
35       * @param version the version
36       * @param srcPrefixLength the prefix length
37       * @param address the bytes of the {@link InetAddress} to use
38       */
39      public DefaultDnsOptEcsRecord(int maxPayloadSize, int extendedRcode, int version,
40                                    int srcPrefixLength, byte[] address) {
41          super(maxPayloadSize, extendedRcode, version);
42          this.srcPrefixLength = srcPrefixLength;
43          this.address = verifyAddress(address).clone();
44      }
45  
46      /**
47       * Creates a new instance.
48       *
49       * @param maxPayloadSize the suggested max payload size in bytes
50       * @param srcPrefixLength the prefix length
51       * @param address the bytes of the {@link InetAddress} to use
52       */
53      public DefaultDnsOptEcsRecord(int maxPayloadSize, int srcPrefixLength, byte[] address) {
54          this(maxPayloadSize, 0, 0, srcPrefixLength, address);
55      }
56  
57      /**
58       * Creates a new instance.
59       *
60       * @param maxPayloadSize the suggested max payload size in bytes
61       * @param protocolFamily the {@link InternetProtocolFamily} to use. This should be the same as the one used to
62       *                       send the query.
63       */
64      public DefaultDnsOptEcsRecord(int maxPayloadSize, InternetProtocolFamily protocolFamily) {
65          this(maxPayloadSize, 0, 0, 0, protocolFamily.localhost().getAddress());
66      }
67  
68      private static byte[] verifyAddress(byte[] bytes) {
69          if (bytes.length == 4 || bytes.length == 16) {
70              return bytes;
71          }
72          throw new IllegalArgumentException("bytes.length must either 4 or 16");
73      }
74  
75      @Override
76      public int sourcePrefixLength() {
77          return srcPrefixLength;
78      }
79  
80      @Override
81      public int scopePrefixLength() {
82          return 0;
83      }
84  
85      @Override
86      public byte[] address() {
87          return address.clone();
88      }
89  
90      @Override
91      public String toString() {
92          StringBuilder sb = toStringBuilder();
93          sb.setLength(sb.length() - 1);
94          return sb.append(" address:")
95            .append(Arrays.toString(address))
96            .append(" sourcePrefixLength:")
97            .append(sourcePrefixLength())
98            .append(" scopePrefixLength:")
99            .append(scopePrefixLength())
100           .append(')').toString();
101     }
102 }