1 /*
2 * Copyright 2013 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
17 package io.netty.handler.codec.socksx;
18
19 /**
20 * The version of SOCKS protocol.
21 */
22 public enum SocksVersion {
23 /**
24 * SOCKS protocol version 4a (or 4)
25 */
26 SOCKS4a((byte) 0x04),
27 /**
28 * SOCKS protocol version 5
29 */
30 SOCKS5((byte) 0x05),
31 /**
32 * Unknown protocol version
33 */
34 UNKNOWN((byte) 0xff);
35
36 /**
37 * Returns the {@link SocksVersion} that corresponds to the specified version field value,
38 * as defined in the protocol specification.
39 *
40 * @return {@link #UNKNOWN} if the specified value does not represent a known SOCKS protocol version
41 */
42 public static SocksVersion valueOf(byte b) {
43 if (b == SOCKS4a.byteValue()) {
44 return SOCKS4a;
45 }
46 if (b == SOCKS5.byteValue()) {
47 return SOCKS5;
48 }
49 return UNKNOWN;
50 }
51
52 private final byte b;
53
54 SocksVersion(byte b) {
55 this.b = b;
56 }
57
58 /**
59 * Returns the value of the version field, as defined in the protocol specification.
60 */
61 public byte byteValue() {
62 return b;
63 }
64 }