1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
//! DNS CLASSes.
//------------ Class ---------------------------------------------------------
int_enum!{
/// DNS CLASSes.
///
/// The domain name space is partitioned into separate classes for different
/// network types. That is, each class has its own separate record tree
/// starting at the root. However, in practice, only the IN class is really
/// relevant.
///
/// In addition, there are query classes or QCLASSes that are used in
/// questions or UPDATE queries, namely NONE and ANY (or *).
///
/// Classes are represented by a 16 bit value. The enum wraps these values.
///
/// See [RFC 1034] for the introduction of classes, section 3.2 of
/// [RFC 6895] for a discussion of the current state of afairs, and
/// the [DNS CLASSes IANA registry] for an overview of assigned values.
/// This type is complete as of the registry update of 2019-01-28.
///
/// [RFC 1034]: https://tools.ietf.org/html/rfc1034
/// [RFC 6895]: https://tools.ietf.org/html/rfc6895
/// [DNS CLASSes IANA registry]: http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-2
=>
Class, u16;
/// Internet (IN).
///
/// This class is defined in RFC 1035 and really the only one relevant
/// at all.
(In => 1, b"IN")
/// Chaosnet (CH).
///
/// A network protocol developed at MIT in the 1970s. Reused by BIND for
/// built-in server information zones.",
(Ch => 3, b"CH")
/// Hesiod (HS).
///
/// A system information protocol part of MIT's Project Athena.",
(Hs => 4, b"HS")
/// Query class None.
///
/// Defined in RFC 2136, this class is used in UPDATE queries to
/// require that an RRset does not exist prior to the update.",
(None => 0xFE, b"NONE")
/// Query class * (ANY).
///
/// This class can be used in a query to indicate that records for the
/// given name from any class are requested.",
(Any => 0xFF, b"*")
}
int_enum_str_with_prefix!(Class, "CLASS", b"CLASS", u16, "unknown class");