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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.util.internal.UnstableApi;
19  
20  /**
21   * An <a href="https://tools.ietf.org/html/rfc6891#section-6.1">OPT RR</a> record.
22   * <p>
23   * This is used for <a href="https://tools.ietf.org/html/rfc6891#section-6.1.3">Extension
24   * Mechanisms for DNS (EDNS(0))</a>.
25   */
26  @UnstableApi
27  public interface DnsOptPseudoRecord extends DnsRecord {
28  
29      /**
30       * Returns the {@code EXTENDED-RCODE} which is encoded into {@link DnsOptPseudoRecord#timeToLive()}.
31       */
32      int extendedRcode();
33  
34      /**
35       * Returns the {@code VERSION} which is encoded into {@link DnsOptPseudoRecord#timeToLive()}.
36       */
37      int version();
38  
39      /**
40       * Returns the {@code flags} which includes {@code DO} and {@code Z} which is encoded
41       * into {@link DnsOptPseudoRecord#timeToLive()}.
42       */
43      int flags();
44  }