resolv 0.4.0

DNS resolution via glibc
Documentation 
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

use super::{RecordData, RecordType};
use crate::error::Error;
use byteorder::ReadBytesExt;
use libresolv_sys::ns_msg as Message;
use libresolv_sys::ns_rr as Rr;
use std::io::Cursor;
use std::slice;

#[derive(Debug, Clone)]
pub struct TLSA {
    pub usage: u8,
    pub selector: u8,
    pub matching_type: u8,
    pub data: Vec<u8>,
}

impl RecordData for TLSA {
    fn get_record_type() -> RecordType {
        RecordType::TLSA
    }

    fn extract(_msg: &mut Message, rr: &Rr) -> Result<TLSA, Error> {
        if rr.type_ != Self::get_record_type() as u16 {
            return Err(Error::WrongRRType);
        }

        let mut reader =
            unsafe { Cursor::new(slice::from_raw_parts(rr.rdata, rr.rdlength as usize)) };

        Ok(TLSA {
            usage: reader.read_u8().unwrap(),
            selector: reader.read_u8().unwrap(),
            matching_type: reader.read_u8().unwrap(),
            data: reader.into_inner()[3..].to_vec(),
        })
    }
}