use std::fmt;
use std::mem;
use std::net::Ipv4Addr;
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;
use crate::utils::ipv4_from_in_addr;
#[derive(Clone, Copy)]
pub struct AResults {
naddrttls: usize,
addrttls: [c_ares_sys::ares_addrttl; MAX_ADDRTTLS],
}
#[derive(Clone, Copy)]
pub struct AResult<'a> {
addrttl: &'a c_ares_sys::ares_addrttl,
}
impl AResults {
pub fn parse_from(data: &[u8]) -> Result<AResults> {
let mut results: AResults = AResults {
naddrttls: MAX_ADDRTTLS,
addrttls: unsafe { mem::MaybeUninit::zeroed().assume_init() },
};
let parse_status = unsafe {
c_ares_sys::ares_parse_a_reply(
data.as_ptr(),
data.len() as c_int,
ptr::null_mut(),
results.addrttls.as_mut_ptr(),
&mut results.naddrttls 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) -> AResultsIter {
AResultsIter {
addrttls: self.addrttls[0..self.naddrttls].iter(),
}
}
}
impl fmt::Display for AResults {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
let results = self.iter().format("}, {");
write!(fmt, "[{{{}}}]", results)
}
}
#[derive(Clone)]
pub struct AResultsIter<'a> {
addrttls: slice::Iter<'a, c_ares_sys::ares_addrttl>,
}
impl<'a> Iterator for AResultsIter<'a> {
type Item = AResult<'a>;
fn next(&mut self) -> Option<Self::Item> {
self.addrttls.next().map(|addrttl| AResult { addrttl })
}
}
impl<'a> IntoIterator for &'a AResults {
type Item = AResult<'a>;
type IntoIter = AResultsIter<'a>;
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
impl<'a> AResult<'a> {
pub fn ipv4(self) -> Ipv4Addr {
ipv4_from_in_addr(self.addrttl.ipaddr)
}
pub fn ttl(self) -> i32 {
#[allow(clippy::unnecessary_cast)]
let ttl = self.addrttl.ttl as i32;
ttl
}
}
impl<'a> fmt::Display for AResult<'a> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "IPv4: {}, ", self.ipv4())?;
write!(fmt, "TTL: {}", self.ttl())
}
}
pub(crate) unsafe extern "C" fn query_a_callback<F>(
arg: *mut c_void,
status: c_int,
_timeouts: c_int,
abuf: *mut c_uchar,
alen: c_int,
) where
F: FnOnce(Result<AResults>) + Send + 'static,
{
ares_callback!(arg as *mut F, status, abuf, alen, AResults::parse_from);
}