c_ares/
aaaa.rs

1use std::fmt;
2use std::mem;
3use std::net::Ipv6Addr;
4use std::os::raw::{c_int, c_uchar, c_void};
5use std::ptr;
6use std::slice;
7
8use itertools::Itertools;
9
10use crate::error::{Error, Result};
11use crate::panic;
12use crate::types::MAX_ADDRTTLS;
13
14/// The result of a successful AAAA lookup.
15#[derive(Clone, Copy)]
16pub struct AAAAResults {
17    naddr6ttls: usize,
18    addr6ttls: [c_ares_sys::ares_addr6ttl; MAX_ADDRTTLS],
19}
20
21/// The contents of a single AAAA record.
22#[derive(Clone, Copy)]
23pub struct AAAAResult<'a> {
24    addr6ttl: &'a c_ares_sys::ares_addr6ttl,
25}
26
27impl AAAAResults {
28    /// Obtain an `AAAAResults` from the response to an AAAA lookup.
29    pub fn parse_from(data: &[u8]) -> Result<AAAAResults> {
30        let mut results: AAAAResults = AAAAResults {
31            naddr6ttls: MAX_ADDRTTLS,
32            addr6ttls: unsafe { mem::MaybeUninit::zeroed().assume_init() },
33        };
34        let parse_status = unsafe {
35            c_ares_sys::ares_parse_aaaa_reply(
36                data.as_ptr(),
37                data.len() as c_int,
38                ptr::null_mut(),
39                results.addr6ttls.as_mut_ptr(),
40                ptr::from_mut(&mut results.naddr6ttls).cast(),
41            )
42        };
43        if parse_status == c_ares_sys::ares_status_t::ARES_SUCCESS as i32 {
44            Ok(results)
45        } else {
46            Err(Error::from(parse_status))
47        }
48    }
49
50    /// Returns an iterator over the `AAAAResult` values in this `AAAAResults`.
51    pub fn iter(&self) -> AAAAResultsIter {
52        AAAAResultsIter {
53            addr6ttls: self.addr6ttls[0..self.naddr6ttls].iter(),
54        }
55    }
56}
57
58impl fmt::Display for AAAAResults {
59    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
60        let results = self.iter().format("}, {");
61        write!(fmt, "[{{{results}}}]")
62    }
63}
64
65/// Iterator of `AAAAResult`s.
66#[derive(Clone)]
67pub struct AAAAResultsIter<'a> {
68    addr6ttls: slice::Iter<'a, c_ares_sys::ares_addr6ttl>,
69}
70
71impl<'a> Iterator for AAAAResultsIter<'a> {
72    type Item = AAAAResult<'a>;
73    fn next(&mut self) -> Option<Self::Item> {
74        self.addr6ttls
75            .next()
76            .map(|addr6ttl| AAAAResult { addr6ttl })
77    }
78}
79
80impl<'a> IntoIterator for &'a AAAAResults {
81    type Item = AAAAResult<'a>;
82    type IntoIter = AAAAResultsIter<'a>;
83
84    fn into_iter(self) -> Self::IntoIter {
85        self.iter()
86    }
87}
88
89impl AAAAResult<'_> {
90    /// Returns the IPv6 address in this `AAAAResult`.
91    pub fn ipv6(self) -> Ipv6Addr {
92        let bytes = unsafe { self.addr6ttl.ip6addr._S6_un._S6_u8 };
93        Ipv6Addr::from(bytes)
94    }
95
96    /// Returns the time-to-live in this `AAAAResult`.
97    pub fn ttl(self) -> i32 {
98        #[allow(clippy::unnecessary_cast)]
99        let ttl = self.addr6ttl.ttl as i32;
100        ttl
101    }
102}
103
104impl fmt::Display for AAAAResult<'_> {
105    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
106        write!(fmt, "IPv6: {}, ", self.ipv6())?;
107        write!(fmt, "TTL: {}", self.ttl())
108    }
109}
110
111pub(crate) unsafe extern "C" fn query_aaaa_callback<F>(
112    arg: *mut c_void,
113    status: c_int,
114    _timeouts: c_int,
115    abuf: *mut c_uchar,
116    alen: c_int,
117) where
118    F: FnOnce(Result<AAAAResults>) + Send + 'static,
119{
120    ares_callback!(arg.cast::<F>(), status, abuf, alen, AAAAResults::parse_from);
121}
c_ares/aaaa.rs

c_ares/
aaaa.rs
