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

#![allow(missing_docs)] // TODO: add docs

use crate::net::{TcpListener, TcpStream, ToSocketAddrs, UdpSocket};
use async_std::{io, net};
use cap_primitives::net::NO_SOCKET_ADDRS;

// FIXME: lots more to do here

pub struct Catalog {
    cap: cap_primitives::net::Catalog,
}

impl Catalog {
    #[inline]
    pub async fn bind_tcp_listener<A: ToSocketAddrs>(&self, addr: A) -> io::Result<TcpListener> {
        let addrs = addr.to_socket_addrs().await?;

        let mut last_err = None;
        for addr in addrs {
            self.cap.check_addr(&addr)?;
            // TODO: when compiling for WASI, use WASI-specific methods instead
            match net::TcpListener::bind(addr).await {
                Ok(tcp_listener) => return Ok(TcpListener::from_std(tcp_listener)),
                Err(e) => last_err = Some(e),
            }
        }
        match last_err {
            Some(e) => Err(e),
            None => Err(net::TcpListener::bind(NO_SOCKET_ADDRS).await.unwrap_err()),
        }
    }

    #[inline]
    pub async fn connect_tcp_stream<A: ToSocketAddrs>(&self, addr: A) -> io::Result<TcpStream> {
        let addrs = addr.to_socket_addrs().await?;

        let mut last_err = None;
        for addr in addrs {
            self.cap.check_addr(&addr)?;
            // TODO: when compiling for WASI, use WASI-specific methods instead
            match net::TcpStream::connect(addr).await {
                Ok(tcp_stream) => return Ok(TcpStream::from_std(tcp_stream)),
                Err(e) => last_err = Some(e),
            }
        }
        match last_err {
            Some(e) => Err(e),
            None => Err(net::TcpStream::connect(NO_SOCKET_ADDRS).await.unwrap_err()),
        }
    }

    // async_std doesn't have `connect_timeout`.

    #[inline]
    pub async fn bind_udp_socket<A: ToSocketAddrs>(&self, addr: A) -> io::Result<UdpSocket> {
        let addrs = addr.to_socket_addrs().await?;

        let mut last_err = None;
        for addr in addrs {
            self.cap.check_addr(&addr)?;
            match net::UdpSocket::bind(addr).await {
                Ok(udp_socket) => return Ok(UdpSocket::from_std(udp_socket)),
                Err(e) => last_err = Some(e),
            }
        }
        match last_err {
            Some(e) => Err(e),
            None => Err(net::UdpSocket::bind(NO_SOCKET_ADDRS).await.unwrap_err()),
        }
    }

    #[inline]
    pub async fn send_to_udp_socket_addr<A: ToSocketAddrs>(
        &self,
        udp_socket: &UdpSocket,
        buf: &[u8],
        addr: A,
    ) -> io::Result<usize> {
        let mut addrs = addr.to_socket_addrs().await?;

        // `UdpSocket::send_to` only sends to the first address.
        let addr = match addrs.next() {
            None => return Err(net::UdpSocket::bind(NO_SOCKET_ADDRS).await.unwrap_err()),
            Some(addr) => addr,
        };
        self.cap.check_addr(&addr)?;
        udp_socket.std.send_to(buf, addr).await
    }

    #[inline]
    pub async fn connect_udp_socket<A: ToSocketAddrs>(
        &self,
        udp_socket: &UdpSocket,
        addr: A,
    ) -> io::Result<()> {
        let addrs = addr.to_socket_addrs().await?;

        let mut last_err = None;
        for addr in addrs {
            self.cap.check_addr(&addr)?;
            match udp_socket.std.connect(addr).await {
                Ok(()) => return Ok(()),
                Err(e) => last_err = Some(e),
            }
        }
        match last_err {
            Some(e) => Err(e),
            None => Err(net::UdpSocket::bind(NO_SOCKET_ADDRS).await.unwrap_err()),
        }
    }
}