1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149

#[cfg(unix)]
use std::os::unix::io::{AsRawFd, RawFd};
#[cfg(windows)]
use std::os::windows::io::{AsRawSocket, RawSocket};

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: ServerConnection,
    pub(crate) state: TlsState,
}

impl<IO> TlsStream<IO> {
    #[inline]
    pub fn get_ref(&self) -> (&IO, &ServerConnection) {
        (&self.io, &self.session)
    }

    #[inline]
    pub fn get_mut(&mut self) -> (&mut IO, &mut ServerConnection) {
        (&mut self.io, &mut self.session)
    }

    #[inline]
    pub fn into_inner(self) -> (IO, ServerConnection) {
        (self.io, self.session)
    }
}

impl<IO> IoSession for TlsStream<IO> {
    type Io = IO;
    type Session = ServerConnection;

    #[inline]
    fn skip_handshake(&self) -> bool {
        false
    }

    #[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 ReadBuf<'_>,
    ) -> Poll<io::Result<()>> {
        let this = self.get_mut();
        let mut stream =
            Stream::new(&mut this.io, &mut this.session).set_eof(!this.state.readable());

        match &this.state {
            TlsState::Stream | TlsState::WriteShutdown => {
                let prev = buf.remaining();

                match stream.as_mut_pin().poll_read(cx, buf) {
                    Poll::Ready(Ok(())) => {
                        if prev == buf.remaining() || stream.eof {
                            this.state.shutdown_read();
                        }

                        Poll::Ready(Ok(()))
                    }
                    Poll::Ready(Err(err)) if err.kind() == io::ErrorKind::UnexpectedEof => {
                        this.state.shutdown_read();
                        Poll::Ready(Err(err))
                    }
                    output => output,
                }
            }
            TlsState::ReadShutdown | TlsState::FullyShutdown => Poll::Ready(Ok(())),
            #[cfg(feature = "early-data")]
            s => unreachable!("server TLS can not hit this state: {:?}", s),
        }
    }
}

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());
        stream.as_mut_pin().poll_write(cx, buf)
    }

    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());
        stream.as_mut_pin().poll_flush(cx)
    }

    fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
        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_shutdown(cx)
    }
}

#[cfg(unix)]
impl<IO> AsRawFd for TlsStream<IO>
where
    IO: AsRawFd,
{
    fn as_raw_fd(&self) -> RawFd {
        self.get_ref().0.as_raw_fd()
    }
}

#[cfg(windows)]
impl<IO> AsRawSocket for TlsStream<IO>
where
    IO: AsRawSocket,
{
    fn as_raw_socket(&self) -> RawSocket {
        self.get_ref().0.as_raw_socket()
    }
}