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use libc::{gid_t, uid_t};
#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
pub struct UCred {
pub uid: uid_t,
pub gid: gid_t,
}
pub(crate) use self::impl_linux::get_peer_cred;
pub(crate) mod impl_linux {
use crate::uds::UnixStream;
use libc::{c_void, getsockopt, socklen_t, SOL_SOCKET, SO_PEERCRED};
use std::os::unix::io::AsRawFd;
use std::{io, mem};
use libc::ucred;
pub(crate) fn get_peer_cred(sock: &UnixStream) -> io::Result<super::UCred> {
unsafe {
let raw_fd = sock.as_raw_fd();
let mut ucred = ucred {
pid: 0,
uid: 0,
gid: 0,
};
let ucred_size = mem::size_of::<ucred>();
assert!(mem::size_of::<u32>() <= mem::size_of::<usize>());
assert!(ucred_size <= u32::max_value() as usize);
let mut ucred_size = ucred_size as socklen_t;
let ret = getsockopt(
raw_fd,
SOL_SOCKET,
SO_PEERCRED,
&mut ucred as *mut ucred as *mut c_void,
&mut ucred_size,
);
if ret == 0 && ucred_size as usize == mem::size_of::<ucred>() {
Ok(super::UCred {
uid: ucred.uid,
gid: ucred.gid,
})
} else {
Err(io::Error::last_os_error())
}
}
}
}