1 /*
2 * Copyright 2026 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 /**
19 * An {@link DnsOptPseudoRecord} that carries a client cookie as defined in
20 * <a href="https://tools.ietf.org/html/rfc7873#section-4">RFC 7873, Domain Name System (DNS) Cookies</a>.
21 */
22 public interface DnsOptCookieRecord extends DnsOptPseudoRecord {
23
24 /**
25 * The length of a client cookie in bytes.
26 */
27 int CLIENT_COOKIE_LENGTH = 8;
28
29 /**
30 * The {@code OPTION-CODE} that is assigned to {@code COOKIE}.
31 */
32 int OPTION_CODE = 10;
33
34 /**
35 * Returns the client cookie, which is always {@link #CLIENT_COOKIE_LENGTH} bytes long.
36 * The returned array is a copy.
37 */
38 byte[] clientCookie();
39 }