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|
use super::*;
use crate::common::IoSession;
/// A wrapper around an underlying raw stream which implements the TLS or SSL
/// protocol.
#[derive(Debug)]
pub struct TlsStream<IO> {
pub(crate) io: IO,
pub(crate) session: ClientConnection,
pub(crate) state: TlsState,
#[cfg(feature = "early-data")]
pub(crate) early_waker: Option<std::task::Waker>,
}
impl<IO> TlsStream<IO> {
#[inline]
pub fn get_ref(&self) -> (&IO, &ClientConnection) {
(&self.io, &self.session)
}
#[inline]
pub fn get_mut(&mut self) -> (&mut IO, &mut ClientConnection) {
(&mut self.io, &mut self.session)
}
#[inline]
pub fn into_inner(self) -> (IO, ClientConnection) {
(self.io, self.session)
}
}
#[cfg(feature = "early-data")]
fn poll_handle_early_data<IO>(
state: &mut TlsState,
stream: &mut Stream<IO, ClientConnection>,
early_waker: &mut Option<std::task::Waker>,
cx: &mut Context<'_>,
bufs: &[io::IoSlice<'_>],
) -> Poll<io::Result<usize>>
where
IO: AsyncRead + AsyncWrite + Unpin,
{
if let TlsState::EarlyData(pos, data) = state {
use std::io::Write;
// write early data
if let Some(mut early_data) = stream.session.early_data() {
let mut written = 0;
for buf in bufs {
if buf.is_empty() {
continue;
}
let len = match early_data.write(buf) {
Ok(0) => break,
Ok(n) => n,
Err(err) => return Poll::Ready(Err(err)),
};
written += len;
data.extend_from_slice(&buf[..len]);
if len < buf.len() {
break;
}
}
if written != 0 {
return Poll::Ready(Ok(written));
}
}
// complete handshake
while stream.session.is_handshaking() {
ready!(stream.handshake(cx))?;
}
// write early data (fallback)
if !stream.session.is_early_data_accepted() {
while *pos < data.len() {
let len = ready!(stream.as_mut_pin().poll_write(cx, &data[*pos..]))?;
*pos += len;
}
}
// end
*state = TlsState::Stream;
if let Some(waker) = early_waker.take() {
waker.wake();
}
}
Poll::Ready(Ok(0))
}
#[cfg(unix)]
impl<S> AsRawFd for TlsStream<S>
where
S: AsRawFd,
{
fn as_raw_fd(&self) -> RawFd {
self.get_ref().0.as_raw_fd()
}
}
#[cfg(windows)]
impl<S> AsRawSocket for TlsStream<S>
where
S: AsRawSocket,
{
fn as_raw_socket(&self) -> RawSocket {
self.get_ref().0.as_raw_socket()
}
}
impl<IO> IoSession for TlsStream<IO> {
type Io = IO;
type Session = ClientConnection;
#[inline]
fn skip_handshake(&self) -> bool {
self.state.is_early_data()
}
#[inline]
fn get_mut(&mut self) -> (&mut TlsState, &mut Self::Io, &mut Self::Session) {
(&mut self.state, &mut self.io, &mut self.session)
}
#[inline]
fn into_io(self) -> Self::Io {
self.io
}
}
impl<IO> AsyncRead for TlsStream<IO>
where
IO: AsyncRead + AsyncWrite + Unpin,
{
fn poll_read(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<io::Result<usize>> {
match self.state {
#[cfg(feature = "early-data")]
TlsState::EarlyData(..) => {
let this = self.get_mut();
// In the EarlyData state, we have not really established a Tls connection.
// Before writing data through `AsyncWrite` and completing the tls handshake,
// we ignore read readiness and return to pending.
//
// In order to avoid event loss,
// we need to register a waker and wake it up after tls is connected.
if this
.early_waker
.as_ref()
.filter(|waker| cx.waker().will_wake(waker))
.is_none()
{
this.early_waker = Some(cx.waker().clone());
}
Poll::Pending
}
TlsState::Stream | TlsState::WriteShutdown => {
let this = self.get_mut();
let mut stream =
Stream::new(&mut this.io, &mut this.session).set_eof(!this.state.readable());
match stream.as_mut_pin().poll_read(cx, buf) {
Poll::Ready(Ok(n)) => {
if n == 0 || stream.eof {
this.state.shutdown_read();
}
Poll::Ready(Ok(n))
}
Poll::Ready(Err(err)) if err.kind() == io::ErrorKind::ConnectionAborted => {
this.state.shutdown_read();
Poll::Ready(Err(err))
}
output => output,
}
}
TlsState::ReadShutdown | TlsState::FullyShutdown => Poll::Ready(Ok(0)),
}
}
}
impl<IO> AsyncWrite for TlsStream<IO>
where
IO: AsyncRead + AsyncWrite + Unpin,
{
/// Note: that it does not guarantee the final data to be sent.
/// To be cautious, you must manually call `flush`.
fn poll_write(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<io::Result<usize>> {
let this = self.get_mut();
let mut stream =
Stream::new(&mut this.io, &mut this.session).set_eof(!this.state.readable());
#[cfg(feature = "early-data")]
{
let bufs = [io::IoSlice::new(buf)];
let written = ready!(poll_handle_early_data(
&mut this.state,
&mut stream,
&mut this.early_waker,
cx,
&bufs
))?;
if written != 0 {
return Poll::Ready(Ok(written));
}
}
stream.as_mut_pin().poll_write(cx, buf)
}
fn poll_write_vectored(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
bufs: &[io::IoSlice<'_>],
) -> Poll<io::Result<usize>> {
let this = self.get_mut();
let mut stream =
Stream::new(&mut this.io, &mut this.session).set_eof(!this.state.readable());
#[cfg(feature = "early-data")]
{
let written = ready!(poll_handle_early_data(
&mut this.state,
&mut stream,
&mut this.early_waker,
cx,
bufs
))?;
if written != 0 {
return Poll::Ready(Ok(written));
}
}
stream.as_mut_pin().poll_write_vectored(cx, bufs)
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
let this = self.get_mut();
let mut stream =
Stream::new(&mut this.io, &mut this.session).set_eof(!this.state.readable());
#[cfg(feature = "early-data")]
{
if let TlsState::EarlyData(ref mut pos, ref mut data) = this.state {
// complete handshake
while stream.session.is_handshaking() {
ready!(stream.handshake(cx))?;
}
// write early data (fallback)
if !stream.session.is_early_data_accepted() {
while *pos < data.len() {
let len = ready!(stream.as_mut_pin().poll_write(cx, &data[*pos..]))?;
*pos += len;
}
}
this.state = TlsState::Stream;
if let Some(waker) = this.early_waker.take() {
waker.wake();
}
}
}
stream.as_mut_pin().poll_flush(cx)
}
fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
#[cfg(feature = "early-data")]
{
// complete handshake
if matches!(self.state, TlsState::EarlyData(..)) {
ready!(self.as_mut().poll_flush(cx))?;
}
}
if self.state.writeable() {
self.session.send_close_notify();
self.state.shutdown_write();
}
let this = self.get_mut();
let mut stream =
Stream::new(&mut this.io, &mut this.session).set_eof(!this.state.readable());
stream.as_mut_pin().poll_close(cx)
}
}
|
