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#![warn(missing_docs)]
use futures_util::future;
use openssl::error::ErrorStack;
use openssl::ssl::{self, ErrorCode, ShutdownResult, Ssl, SslRef};
use std::fmt;
use std::io::{self, Read, Write};
use std::pin::Pin;
use std::slice;
use std::task::{Context, Poll};
use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
#[cfg(test)]
mod test;
struct StreamWrapper<S> {
stream: S,
context: usize,
}
impl<S> fmt::Debug for StreamWrapper<S>
where
S: fmt::Debug,
{
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Debug::fmt(&self.stream, fmt)
}
}
impl<S> StreamWrapper<S> {
unsafe fn parts(&mut self) -> (Pin<&mut S>, &mut Context<'_>) {
debug_assert_ne!(self.context, 0);
let stream = Pin::new_unchecked(&mut self.stream);
let context = &mut *(self.context as *mut _);
(stream, context)
}
}
impl<S> Read for StreamWrapper<S>
where
S: AsyncRead,
{
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
let (stream, cx) = unsafe { self.parts() };
let mut buf = ReadBuf::new(buf);
match stream.poll_read(cx, &mut buf)? {
Poll::Ready(()) => Ok(buf.filled().len()),
Poll::Pending => Err(io::Error::from(io::ErrorKind::WouldBlock)),
}
}
}
impl<S> Write for StreamWrapper<S>
where
S: AsyncWrite,
{
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
let (stream, cx) = unsafe { self.parts() };
match stream.poll_write(cx, buf) {
Poll::Ready(r) => r,
Poll::Pending => Err(io::Error::from(io::ErrorKind::WouldBlock)),
}
}
fn flush(&mut self) -> io::Result<()> {
let (stream, cx) = unsafe { self.parts() };
match stream.poll_flush(cx) {
Poll::Ready(r) => r,
Poll::Pending => Err(io::Error::from(io::ErrorKind::WouldBlock)),
}
}
}
fn cvt<T>(r: io::Result<T>) -> Poll<io::Result<T>> {
match r {
Ok(v) => Poll::Ready(Ok(v)),
Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => Poll::Pending,
Err(e) => Poll::Ready(Err(e)),
}
}
fn cvt_ossl<T>(r: Result<T, ssl::Error>) -> Poll<Result<T, ssl::Error>> {
match r {
Ok(v) => Poll::Ready(Ok(v)),
Err(e) => match e.code() {
ErrorCode::WANT_READ | ErrorCode::WANT_WRITE => Poll::Pending,
_ => Poll::Ready(Err(e)),
},
}
}
#[derive(Debug)]
pub struct SslStream<S>(ssl::SslStream<StreamWrapper<S>>);
impl<S> SslStream<S>
where
S: AsyncRead + AsyncWrite,
{
pub fn new(ssl: Ssl, stream: S) -> Result<Self, ErrorStack> {
ssl::SslStream::new(ssl, StreamWrapper { stream, context: 0 }).map(SslStream)
}
pub fn poll_connect(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), ssl::Error>> {
self.with_context(cx, |s| cvt_ossl(s.connect()))
}
pub async fn connect(mut self: Pin<&mut Self>) -> Result<(), ssl::Error> {
future::poll_fn(|cx| self.as_mut().poll_connect(cx)).await
}
pub fn poll_accept(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), ssl::Error>> {
self.with_context(cx, |s| cvt_ossl(s.accept()))
}
pub async fn accept(mut self: Pin<&mut Self>) -> Result<(), ssl::Error> {
future::poll_fn(|cx| self.as_mut().poll_accept(cx)).await
}
pub fn poll_do_handshake(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), ssl::Error>> {
self.with_context(cx, |s| cvt_ossl(s.do_handshake()))
}
pub async fn do_handshake(mut self: Pin<&mut Self>) -> Result<(), ssl::Error> {
future::poll_fn(|cx| self.as_mut().poll_do_handshake(cx)).await
}
#[cfg(ossl111)]
pub fn poll_read_early_data(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<Result<usize, ssl::Error>> {
self.with_context(cx, |s| cvt_ossl(s.read_early_data(buf)))
}
#[cfg(ossl111)]
pub async fn read_early_data(
mut self: Pin<&mut Self>,
buf: &mut [u8],
) -> Result<usize, ssl::Error> {
future::poll_fn(|cx| self.as_mut().poll_read_early_data(cx, buf)).await
}
#[cfg(ossl111)]
pub fn poll_write_early_data(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<Result<usize, ssl::Error>> {
self.with_context(cx, |s| cvt_ossl(s.write_early_data(buf)))
}
#[cfg(ossl111)]
pub async fn write_early_data(
mut self: Pin<&mut Self>,
buf: &[u8],
) -> Result<usize, ssl::Error> {
future::poll_fn(|cx| self.as_mut().poll_write_early_data(cx, buf)).await
}
}
impl<S> SslStream<S> {
pub fn ssl(&self) -> &SslRef {
self.0.ssl()
}
pub fn get_ref(&self) -> &S {
&self.0.get_ref().stream
}
pub fn get_mut(&mut self) -> &mut S {
&mut self.0.get_mut().stream
}
pub fn get_pin_mut(self: Pin<&mut Self>) -> Pin<&mut S> {
unsafe { Pin::new_unchecked(&mut self.get_unchecked_mut().0.get_mut().stream) }
}
fn with_context<F, R>(self: Pin<&mut Self>, ctx: &mut Context<'_>, f: F) -> R
where
F: FnOnce(&mut ssl::SslStream<StreamWrapper<S>>) -> R,
{
let this = unsafe { self.get_unchecked_mut() };
this.0.get_mut().context = ctx as *mut _ as usize;
let r = f(&mut this.0);
this.0.get_mut().context = 0;
r
}
}
impl<S> AsyncRead for SslStream<S>
where
S: AsyncRead + AsyncWrite,
{
fn poll_read(
self: Pin<&mut Self>,
ctx: &mut Context<'_>,
buf: &mut ReadBuf<'_>,
) -> Poll<io::Result<()>> {
self.with_context(ctx, |s| {
let slice = unsafe {
let buf = buf.unfilled_mut();
slice::from_raw_parts_mut(buf.as_mut_ptr().cast::<u8>(), buf.len())
};
match cvt(s.read(slice))? {
Poll::Ready(nread) => {
unsafe {
buf.assume_init(nread);
}
buf.advance(nread);
Poll::Ready(Ok(()))
}
Poll::Pending => Poll::Pending,
}
})
}
}
impl<S> AsyncWrite for SslStream<S>
where
S: AsyncRead + AsyncWrite,
{
fn poll_write(self: Pin<&mut Self>, ctx: &mut Context, buf: &[u8]) -> Poll<io::Result<usize>> {
self.with_context(ctx, |s| cvt(s.write(buf)))
}
fn poll_flush(self: Pin<&mut Self>, ctx: &mut Context) -> Poll<io::Result<()>> {
self.with_context(ctx, |s| cvt(s.flush()))
}
fn poll_shutdown(mut self: Pin<&mut Self>, ctx: &mut Context) -> Poll<io::Result<()>> {
match self.as_mut().with_context(ctx, |s| s.shutdown()) {
Ok(ShutdownResult::Sent) | Ok(ShutdownResult::Received) => {}
Err(ref e) if e.code() == ErrorCode::ZERO_RETURN => {}
Err(ref e) if e.code() == ErrorCode::WANT_READ || e.code() == ErrorCode::WANT_WRITE => {
return Poll::Pending;
}
Err(e) => {
return Poll::Ready(Err(e
.into_io_error()
.unwrap_or_else(|e| io::Error::new(io::ErrorKind::Other, e))));
}
}
self.get_pin_mut().poll_shutdown(ctx)
}
}