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OpenBSD fix long socket addresses

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Original diff from @notgull in #118349, small changes from me.

on OpenBSD, getsockname(2) returns the actual size of the socket address, and 
not the len of the content. Figure out the length for ourselves.
see https://marc.info/?l=openbsd-bugs&m=170105481926736&w=2

Fixes #116523
This commit is contained in:
Sebastien Marie 2024-04-11 08:43:38 +00:00
parent f13f37fd7b
commit 7aaad6b7e2
1 changed files with 10 additions and 0 deletions
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10
library/std/src/os/unix/net/addr.rs
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@ -107,6 +107,16 @@ pub(super) fn from_parts(
addr: libc::sockaddr_un,
mut len: libc::socklen_t,
) -> io::Result<SocketAddr> {
if cfg!(target_os = "openbsd") {
// on OpenBSD, getsockname(2) returns the actual size of the socket address,
// and not the len of the content. Figure out the length for ourselves.
// https://marc.info/?l=openbsd-bugs&m=170105481926736&w=2
let sun_path: &[u8] =
unsafe { mem::transmute::<&[libc::c_char], &[u8]>(&addr.sun_path) };
len = core::slice::memchr::memchr(0, sun_path)
.map_or(len, |new_len| (new_len + sun_path_offset(&addr)) as libc::socklen_t);
}
if len == 0 {
// When there is a datagram from unnamed unix socket
// linux returns zero bytes of address