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//! Functions to help test this crate.
use std::io;
/// The type of stream returned by `construct_socketpair`.
#[cfg(not(windows))]
pub(crate) type SocketpairStream = socketpair::SocketpairStream;
#[cfg(windows)]
pub(crate) type SocketpairStream = std::net::TcpStream;
/// Test helper: construct a socketpair.
pub(crate) fn construct_socketpair() -> io::Result<(SocketpairStream, SocketpairStream)> {
#[cfg(not(windows))]
{
socketpair::socketpair_stream()
}
#[cfg(windows)]
{
// Alas, we can't use the socketpair crate on Windows! It creates a Windows
// "named pipe". Windows "named pipe"s are not named pipes. They are strange
// things which a bit like an unholy cross between a Unix named pipe (aka a FIFO)
// and an AF_UNIX socket. This makes them bizarre and awkward. They are best
// avoided if possible.
//
// We have to use this nonsense instead. It will cause these tests to fail on
// some absurdly restrictive windows firewalls; that's a price we can afford.
//
// For details see
// https://gitlab.torproject.org/tpo/core/arti/-/merge_requests/2758#note_3155460
let listener = std::net::TcpListener::bind("127.0.0.1:0")?;
let addr = listener.local_addr()?;
let s1 = std::net::TcpStream::connect(addr)?;
let (s2, s2_addr) = listener.accept()?;
assert_eq!(s1.local_addr().unwrap(), s2_addr);
Ok((s1, s2))
}
}
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