dns_message_parser/
dns.rs

1use crate::question::Question;
2use crate::rr::RR;
3use crate::{Opcode, RCode};
4use std::fmt::{Display, Formatter, Result as FmtResult};
5
6#[derive(Debug, Clone, PartialEq, Eq)]
7pub struct Flags {
8    pub qr: bool,
9    pub opcode: Opcode,
10    pub aa: bool,
11    pub tc: bool,
12    pub rd: bool,
13    pub ra: bool,
14    pub ad: bool, // RFC2535 6.1 The AD and CD Header Bits
15    pub cd: bool, // RFC2535 6.1 The AD and CD Header Bits
16    pub rcode: RCode,
17}
18
19impl Display for Flags {
20    fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
21        if self.qr {
22            write!(f, "qr ")?;
23        }
24
25        write!(f, "{:?} ", self.opcode)?;
26
27        if self.aa {
28            write!(f, "aa ")?;
29        }
30
31        if self.tc {
32            write!(f, "tc ")?;
33        }
34
35        if self.rd {
36            write!(f, "rd ")?;
37        }
38
39        if self.ra {
40            write!(f, "ra ")?;
41        }
42
43        if self.ad {
44            write!(f, "ad ")?;
45        }
46
47        if self.cd {
48            write!(f, "cd ")?;
49        }
50
51        write!(f, "{:?}", self.rcode)
52    }
53}
54
55#[derive(Debug, Clone, PartialEq, Eq)]
56pub struct Dns {
57    pub id: u16,
58    pub flags: Flags,
59    pub questions: Vec<Question>,
60    pub answers: Vec<RR>,
61    pub authorities: Vec<RR>,
62    pub additionals: Vec<RR>,
63}
64
65impl Dns {
66    #[inline]
67    pub const fn is_response(&self) -> bool {
68        self.flags.qr
69    }
70}
71
72#[inline]
73fn print_slice<T>(f: &mut Formatter<'_>, slice: &[T]) -> FmtResult
74where
75    T: Display,
76{
77    write!(f, "[")?;
78    for e in slice {
79        write!(f, "{}, ", e)?;
80    }
81    write!(f, "]")?;
82    Ok(())
83}
84
85impl Display for Dns {
86    fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
87        write!(f, "{} {} ", self.id, self.flags)?;
88
89        if !self.questions.is_empty() {
90            write!(f, "questions ")?;
91            print_slice(f, &self.questions)?;
92            write!(f, " ")?;
93        }
94
95        if !self.answers.is_empty() {
96            write!(f, "answers ")?;
97            print_slice(f, &self.answers)?;
98            write!(f, " ")?;
99        }
100
101        if !self.authorities.is_empty() {
102            write!(f, "authorities ")?;
103            print_slice(f, &self.authorities)?;
104            write!(f, " ")?;
105        }
106
107        if !self.additionals.is_empty() {
108            write!(f, "additionals ")?;
109            print_slice(f, &self.additionals)?;
110        }
111
112        Ok(())
113    }
114}
dns_message_parser/dns.rs

dns_message_parser/
dns.rs
