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use std::fmt;
use std::os::raw::{
c_int,
c_uchar,
c_void,
};
use std::ptr;
use std::slice;
use c_ares_sys;
use c_types;
use itertools::Itertools;
use error::{
Error,
Result,
};
use hostent::{
HasHostent,
HostAliasResultsIter,
HostentOwned,
};
#[derive(Debug)]
pub struct PTRResults {
hostent: HostentOwned,
}
impl PTRResults {
pub fn parse_from(data: &[u8]) -> Result<PTRResults> {
let mut hostent: *mut c_types::hostent = ptr::null_mut();
let dummy_ip = [0,0,0,0];
let parse_status = unsafe {
c_ares_sys::ares_parse_ptr_reply(
data.as_ptr(),
data.len() as c_int,
dummy_ip.as_ptr() as *const c_void,
dummy_ip.len() as c_int,
c_types::AF_INET,
&mut hostent as *mut _ as *mut *mut c_ares_sys::hostent)
};
if parse_status == c_ares_sys::ARES_SUCCESS {
let result = PTRResults::new(hostent);
Ok(result)
} else {
Err(Error::from(parse_status))
}
}
fn new(hostent: *mut c_types::hostent) -> PTRResults {
PTRResults {
hostent: HostentOwned::new(hostent),
}
}
pub fn hostname(&self) -> &str {
self.hostent.hostname()
}
pub fn aliases(&self) -> HostAliasResultsIter {
self.hostent.aliases()
}
}
impl fmt::Display for PTRResults {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "Hostname: {}, ", self.hostname())?;
let aliases = self.aliases().format(", ");
write!(fmt, "Aliases: [{}]", aliases)?;
Ok(())
}
}
pub unsafe extern "C" fn query_ptr_callback<F>(
arg: *mut c_void,
status: c_int,
_timeouts: c_int,
abuf: *mut c_uchar,
alen: c_int)
where F: FnOnce(Result<PTRResults>) + Send + 'static {
let result = if status == c_ares_sys::ARES_SUCCESS {
let data = slice::from_raw_parts(abuf, alen as usize);
PTRResults::parse_from(data)
} else {
Err(Error::from(status))
};
let handler = Box::from_raw(arg as *mut F);
handler(result);
}