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use BOOL for TCP_NODELAY setsockopt value on Windows

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This issue was found by the Wine project and mitigated there [1].

Windows' documented interface for `setsockopt` expects a `BOOL` (a
`typedef` for `int`) for `TCP_NODELAY` [2]. Windows is forgiving and
will accept any positive length and interpret the first byte of
`*option_value` as the value, so this bug does not affect Windows
itself, but does affect systems implementing Windows' interface more
strictly, such as Wine. Wine was previously passing this through to the
host's `setsockopt`, where, e.g., Linux requires that `option_len` be
correct for the chosen option, and `TCP_NODELAY` expects an `int`.

[1]: d6ea38f32d
[2]: https://docs.microsoft.com/en-us/windows/win32/api/winsock/nf-winsock-setsockopt
This commit is contained in:
Chris Copeland 2022-02-16 22:02:58 -08:00
parent f2ebd0a11f
commit b02698c7e6
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1 changed files with 2 additions and 2 deletions
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4
library/std/src/sys/windows/net.rs
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@ -407,11 +407,11 @@ pub fn linger(&self) -> io::Result<Option<Duration>> {
}
pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
net::setsockopt(self, c::IPPROTO_TCP, c::TCP_NODELAY, nodelay as c::BYTE)
net::setsockopt(self, c::IPPROTO_TCP, c::TCP_NODELAY, nodelay as c::BOOL)
}
pub fn nodelay(&self) -> io::Result<bool> {
let raw: c::BYTE = net::getsockopt(self, c::IPPROTO_TCP, c::TCP_NODELAY)?;
let raw: c::BOOL = net::getsockopt(self, c::IPPROTO_TCP, c::TCP_NODELAY)?;
Ok(raw != 0)
}