use std::fmt;
use std::mem;
use std::net::Ipv6Addr;
use std::os::raw::{c_int, c_uchar, c_void};
use std::ptr;
use std::slice;
use itertools::Itertools;
use crate::error::{Error, Result};
use crate::panic;
use crate::types::MAX_ADDRTTLS;
#[derive(Clone, Copy)]
pub struct AAAAResults {
naddr6ttls: usize,
addr6ttls: [c_ares_sys::ares_addr6ttl; MAX_ADDRTTLS],
}
#[derive(Clone, Copy)]
pub struct AAAAResult<'a> {
addr6ttl: &'a c_ares_sys::ares_addr6ttl,
}
impl AAAAResults {
pub fn parse_from(data: &[u8]) -> Result<AAAAResults> {
let mut results: AAAAResults = AAAAResults {
naddr6ttls: MAX_ADDRTTLS,
addr6ttls: unsafe { mem::MaybeUninit::zeroed().assume_init() },
};
let parse_status = unsafe {
c_ares_sys::ares_parse_aaaa_reply(
data.as_ptr(),
data.len() as c_int,
ptr::null_mut(),
results.addr6ttls.as_mut_ptr(),
&mut results.naddr6ttls as *mut _ as *mut c_int,
)
};
if parse_status == c_ares_sys::ARES_SUCCESS {
Ok(results)
} else {
Err(Error::from(parse_status))
}
}
pub fn iter(&self) -> AAAAResultsIter {
AAAAResultsIter {
addr6ttls: self.addr6ttls[0..self.naddr6ttls].iter(),
}
}
}
impl fmt::Display for AAAAResults {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
let results = self.iter().format("}, {");
write!(fmt, "[{{{}}}]", results)
}
}
#[derive(Clone)]
pub struct AAAAResultsIter<'a> {
addr6ttls: slice::Iter<'a, c_ares_sys::ares_addr6ttl>,
}
impl<'a> Iterator for AAAAResultsIter<'a> {
type Item = AAAAResult<'a>;
fn next(&mut self) -> Option<Self::Item> {
self.addr6ttls
.next()
.map(|addr6ttl| AAAAResult { addr6ttl })
}
}
impl<'a> IntoIterator for &'a AAAAResults {
type Item = AAAAResult<'a>;
type IntoIter = AAAAResultsIter<'a>;
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
impl<'a> AAAAResult<'a> {
pub fn ipv6(self) -> Ipv6Addr {
let bytes = unsafe { self.addr6ttl.ip6addr._S6_un._S6_u8 };
Ipv6Addr::from(bytes)
}
pub fn ttl(self) -> i32 {
#[allow(clippy::unnecessary_cast)]
let ttl = self.addr6ttl.ttl as i32;
ttl
}
}
impl<'a> fmt::Display for AAAAResult<'a> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "IPv6: {}, ", self.ipv6())?;
write!(fmt, "TTL: {}", self.ttl())
}
}
pub(crate) unsafe extern "C" fn query_aaaa_callback<F>(
arg: *mut c_void,
status: c_int,
_timeouts: c_int,
abuf: *mut c_uchar,
alen: c_int,
) where
F: FnOnce(Result<AAAAResults>) + Send + 'static,
{
ares_callback!(arg as *mut F, status, abuf, alen, AAAAResults::parse_from);
}