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use futures_core::ready;
use std::{
collections::VecDeque,
fmt::Debug,
future::Future,
marker::PhantomData,
ops::Deref,
pin::Pin,
task::{Context, Poll},
};
use crate::{
guid::Guid,
raw::{self, Handshake as SyncHandshake, Socket},
Result,
};
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum AuthMechanism {
External,
Cookie,
Anonymous,
}
pub(crate) struct Authenticated<S>(raw::Authenticated<S>);
impl<S> Authenticated<S> {
pub fn into_inner(self) -> raw::Authenticated<S> {
self.0
}
}
impl<S> Deref for Authenticated<S> {
type Target = raw::Authenticated<S>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<S> Authenticated<S>
where
S: Socket + Unpin,
{
pub async fn client(socket: S, mechanisms: Option<VecDeque<AuthMechanism>>) -> Result<Self> {
Handshake {
handshake: Some(raw::ClientHandshake::new(socket, mechanisms)),
phantom: PhantomData,
}
.await
}
pub async fn server(
socket: S,
guid: Guid,
#[cfg(unix)] client_uid: u32,
#[cfg(windows)] client_sid: Option<String>,
auth_mechanisms: Option<VecDeque<AuthMechanism>>,
) -> Result<Self> {
Handshake {
handshake: Some(raw::ServerHandshake::new(
socket,
guid,
#[cfg(unix)]
client_uid,
#[cfg(windows)]
client_sid,
auth_mechanisms,
)?),
phantom: PhantomData,
}
.await
}
}
struct Handshake<H, S> {
handshake: Option<H>,
phantom: PhantomData<S>,
}
impl<H, S> Future for Handshake<H, S>
where
H: SyncHandshake<S> + Unpin + Debug,
S: Unpin,
{
type Output = Result<Authenticated<S>>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let self_mut = &mut self.get_mut();
let handshake = self_mut
.handshake
.as_mut()
.expect("ClientHandshake::poll() called unexpectedly");
ready!(handshake.advance_handshake(cx))?;
let handshake = self_mut
.handshake
.take()
.expect("<Handshake as Future>::poll() called unexpectedly");
let authenticated = handshake
.try_finish()
.expect("Failed to finish a successful handshake");
Poll::Ready(Ok(Authenticated(authenticated)))
}
}
#[cfg(all(unix, feature = "async-io"))]
#[cfg(test)]
mod tests {
use async_io::Async;
use nix::unistd::Uid;
use std::os::unix::net::UnixStream;
use test_log::test;
use super::*;
use crate::{Guid, Result};
#[test]
fn async_handshake() {
crate::utils::block_on(handshake()).unwrap();
}
async fn handshake() -> Result<()> {
let (p0, p1) = UnixStream::pair()?;
let client = Authenticated::client(Async::new(p0)?, None);
let server = Authenticated::server(
Async::new(p1)?,
Guid::generate(),
Uid::current().into(),
None,
);
let (client_auth, server_auth) = futures_util::try_join!(client, server)?;
assert_eq!(client_auth.server_guid, server_auth.server_guid);
assert_eq!(client_auth.cap_unix_fd, server_auth.cap_unix_fd);
Ok(())
}
}