tokio-rustls/src/lib.rs

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//! Async TLS streams
//!
//! [tokio-tls](https://github.com/tokio-rs/tokio-tls) fork, use [rustls](https://github.com/ctz/rustls).
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#[cfg_attr(feature = "tokio-proto", macro_use)]
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extern crate futures;
extern crate tokio_core;
extern crate rustls;
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pub mod proto;
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use std::io;
use std::sync::Arc;
use futures::{ Future, Poll, Async };
use tokio_core::io::Io;
use rustls::{ Session, ClientSession, ServerSession };
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use rustls::{ ClientConfig, ServerConfig };
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/// Extension trait for the `Arc<ClientConfig>` type in the `rustls` crate.
pub trait ClientConfigExt {
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fn connect_async<S>(&self, domain: &str, stream: S)
-> ConnectAsync<S>
where S: Io;
}
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/// Extension trait for the `Arc<ServerConfig>` type in the `rustls` crate.
pub trait ServerConfigExt {
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fn accept_async<S>(&self, stream: S)
-> AcceptAsync<S>
where S: Io;
}
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/// Future returned from `ClientConfigExt::connect_async` which will resolve
/// once the connection handshake has finished.
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pub struct ConnectAsync<S>(MidHandshake<S, ClientSession>);
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/// Future returned from `ServerConfigExt::accept_async` which will resolve
/// once the accept handshake has finished.
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pub struct AcceptAsync<S>(MidHandshake<S, ServerSession>);
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impl ClientConfigExt for Arc<ClientConfig> {
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fn connect_async<S>(&self, domain: &str, stream: S)
-> ConnectAsync<S>
where S: Io
{
ConnectAsync(MidHandshake {
inner: Some(TlsStream::new(stream, ClientSession::new(self, domain)))
})
}
}
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impl ServerConfigExt for Arc<ServerConfig> {
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fn accept_async<S>(&self, stream: S)
-> AcceptAsync<S>
where S: Io
{
AcceptAsync(MidHandshake {
inner: Some(TlsStream::new(stream, ServerSession::new(self)))
})
}
}
impl<S: Io> Future for ConnectAsync<S> {
type Item = TlsStream<S, ClientSession>;
type Error = io::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
self.0.poll()
}
}
impl<S: Io> Future for AcceptAsync<S> {
type Item = TlsStream<S, ServerSession>;
type Error = io::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
self.0.poll()
}
}
struct MidHandshake<S, C> {
inner: Option<TlsStream<S, C>>
}
impl<S, C> Future for MidHandshake<S, C>
where S: Io, C: Session
{
type Item = TlsStream<S, C>;
type Error = io::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
loop {
let stream = self.inner.as_mut().unwrap_or_else(|| unreachable!());
if !stream.session.is_handshaking() { break };
match stream.do_io() {
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Ok(()) => if stream.eof {
return Err(io::Error::from(io::ErrorKind::UnexpectedEof))
} else if stream.session.is_handshaking() {
continue
} else {
break
},
Err(e) => match (e.kind(), stream.session.is_handshaking()) {
(io::ErrorKind::WouldBlock, true) => return Ok(Async::NotReady),
(io::ErrorKind::WouldBlock, false) => break,
(..) => return Err(e)
}
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}
}
Ok(Async::Ready(self.inner.take().unwrap_or_else(|| unreachable!())))
}
}
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/// A wrapper around an underlying raw stream which implements the TLS or SSL
/// protocol.
#[derive(Debug)]
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pub struct TlsStream<S, C> {
eof: bool,
io: S,
session: C
}
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impl<S, C> TlsStream<S, C> {
pub fn get_ref(&self) -> (&S, &C) {
(&self.io, &self.session)
}
pub fn get_mut(&mut self) -> (&mut S, &mut C) {
(&mut self.io, &mut self.session)
}
}
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impl<S, C> TlsStream<S, C>
where S: Io, C: Session
{
#[inline]
pub fn new(io: S, session: C) -> TlsStream<S, C> {
TlsStream {
eof: false,
io: io,
session: session
}
}
pub fn do_io(&mut self) -> io::Result<()> {
loop {
let read_would_block = match (!self.eof && self.session.wants_read(), self.io.poll_read()) {
(true, Async::Ready(())) => {
match self.session.read_tls(&mut self.io) {
Ok(0) => self.eof = true,
Ok(_) => self.session.process_new_packets()
.map_err(|err| io::Error::new(io::ErrorKind::Other, err))?,
Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => (),
Err(e) => return Err(e)
};
continue
},
(true, Async::NotReady) => true,
(false, _) => false,
};
let write_would_block = match (self.session.wants_write(), self.io.poll_write()) {
(true, Async::Ready(())) => match self.session.write_tls(&mut self.io) {
Ok(_) => continue,
Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => continue,
Err(e) => return Err(e)
},
(true, Async::NotReady) => true,
(false, _) => false
};
if read_would_block || write_would_block {
return Err(io::Error::from(io::ErrorKind::WouldBlock));
} else {
return Ok(());
}
}
}
}
impl<S, C> io::Read for TlsStream<S, C>
where S: Io, C: Session
{
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
self.do_io()?;
if self.eof {
Ok(0)
} else {
self.session.read(buf)
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}
}
}
impl<S, C> io::Write for TlsStream<S, C>
where S: Io, C: Session
{
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
let output = self.session.write(buf);
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while self.session.wants_write() && self.io.poll_write().is_ready() {
self.session.write_tls(&mut self.io)?;
}
output
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}
fn flush(&mut self) -> io::Result<()> {
self.session.flush()?;
while self.session.wants_write() && self.io.poll_write().is_ready() {
self.session.write_tls(&mut self.io)?;
}
Ok(())
}
}
impl<S, C> Io for TlsStream<S, C> where S: Io, C: Session {}