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use std::cmp::Ordering;
use std::convert::From;
use std::fmt;
use std::fmt::{Display, Formatter};
use std::str::FromStr;
#[cfg(feature = "serde-config")]
use serde::{Deserialize, Serialize};
use crate::error::*;
use crate::serialize::binary::*;
#[cfg_attr(feature = "serde-config", derive(Deserialize, Serialize))]
#[derive(Debug, PartialEq, Eq, Hash, Copy, Clone)]
#[allow(dead_code)]
pub enum DNSClass {
IN,
CH,
HS,
NONE,
ANY,
OPT(u16),
}
impl FromStr for DNSClass {
type Err = ProtoError;
fn from_str(str: &str) -> ProtoResult<Self> {
debug_assert!(str.chars().all(|x| char::is_ascii_uppercase(&x)));
match str {
"IN" => Ok(Self::IN),
"CH" => Ok(Self::CH),
"HS" => Ok(Self::HS),
"NONE" => Ok(Self::NONE),
"ANY" | "*" => Ok(Self::ANY),
_ => Err(ProtoErrorKind::UnknownDnsClassStr(str.to_string()).into()),
}
}
}
impl DNSClass {
pub fn from_u16(value: u16) -> ProtoResult<Self> {
match value {
1 => Ok(Self::IN),
3 => Ok(Self::CH),
4 => Ok(Self::HS),
254 => Ok(Self::NONE),
255 => Ok(Self::ANY),
_ => Err(ProtoErrorKind::UnknownDnsClassValue(value).into()),
}
}
pub fn for_opt(value: u16) -> Self {
let value = value.max(512);
Self::OPT(value)
}
}
impl BinEncodable for DNSClass {
fn emit(&self, encoder: &mut BinEncoder<'_>) -> ProtoResult<()> {
encoder.emit_u16((*self).into())
}
}
impl<'r> BinDecodable<'r> for DNSClass {
fn read(decoder: &mut BinDecoder<'_>) -> ProtoResult<Self> {
Self::from_u16(
decoder.read_u16()?.unverified(),
)
}
}
impl From<DNSClass> for &'static str {
fn from(rt: DNSClass) -> &'static str {
match rt {
DNSClass::IN => "IN",
DNSClass::CH => "CH",
DNSClass::HS => "HS",
DNSClass::NONE => "NONE",
DNSClass::ANY => "ANY",
DNSClass::OPT(_) => "OPT",
}
}
}
impl From<DNSClass> for u16 {
fn from(rt: DNSClass) -> Self {
match rt {
DNSClass::IN => 1,
DNSClass::CH => 3,
DNSClass::HS => 4,
DNSClass::NONE => 254,
DNSClass::ANY => 255,
DNSClass::OPT(max_payload_len) => max_payload_len.max(512),
}
}
}
impl PartialOrd<Self> for DNSClass {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl Ord for DNSClass {
fn cmp(&self, other: &Self) -> Ordering {
u16::from(*self).cmp(&u16::from(*other))
}
}
impl Display for DNSClass {
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), fmt::Error> {
f.write_str(Into::<&str>::into(*self))
}
}
#[test]
fn test_order() {
let ordered = vec![
DNSClass::IN,
DNSClass::CH,
DNSClass::HS,
DNSClass::NONE,
DNSClass::ANY,
];
let mut unordered = vec![
DNSClass::NONE,
DNSClass::HS,
DNSClass::CH,
DNSClass::IN,
DNSClass::ANY,
];
unordered.sort();
assert_eq!(unordered, ordered);
}