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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    *   http://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  import java.net.InetAddress;
21  
22  /**
23   * An ECS record as defined in <a href="https://tools.ietf.org/html/rfc7871#section-6">Client Subnet in DNS Queries</a>.
24   */
25  @UnstableApi
26  public interface DnsOptEcsRecord extends DnsOptPseudoRecord {
27  
28      /**
29       * Returns the leftmost number of significant bits of ADDRESS to be used for the lookup.
30       */
31      int sourcePrefixLength();
32  
33      /**
34       * Returns the leftmost number of significant bits of ADDRESS that the response covers.
35       * In queries, it MUST be 0.
36       */
37      int scopePrefixLength();
38  
39      /**
40       * Returns the bytes of the {@link InetAddress} to use.
41       */
42      byte[] address();
43  }