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
use libc::{uid_t, gid_t};
#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
pub struct UCred {
pub uid: uid_t,
pub gid: gid_t,
}
#[cfg(target_os = "linux")]
pub use self::impl_linux::get_peer_cred;
#[cfg(any(target_os = "macos", target_os = "ios", target_os = "freebsd"))]
pub use self::impl_macos::get_peer_cred;
#[cfg(target_os = "linux")]
pub mod impl_linux {
use libc::{getsockopt, SOL_SOCKET, SO_PEERCRED, c_void};
use std::{io, mem};
use UnixStream;
use std::os::unix::io::AsRawFd;
use libc::ucred;
pub 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 u32;
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())
}
}
}
}
#[cfg(any(target_os = "macos", target_os = "ios", target_os = "freebsd"))]
pub mod impl_macos {
use libc::getpeereid;
use std::{io, mem};
use UnixStream;
use std::os::unix::io::AsRawFd;
pub fn get_peer_cred(sock: &UnixStream) -> io::Result<super::UCred> {
unsafe {
let raw_fd = sock.as_raw_fd();
let mut cred: super::UCred = mem::uninitialized();
let ret = getpeereid(raw_fd, &mut cred.uid, &mut cred.gid);
if ret == 0 {
Ok(cred)
} else {
Err(io::Error::last_os_error())
}
}
}
}
#[cfg(test)]
mod test {
use tokio_core::reactor::Core;
use UnixStream;
use libc::geteuid;
use libc::getegid;
#[test]
fn test_socket_pair() {
let core = Core::new().unwrap();
let handle = core.handle();
let (a, b) = UnixStream::pair(&handle).unwrap();
let cred_a = a.peer_cred().unwrap();
let cred_b = b.peer_cred().unwrap();
assert_eq!(cred_a, cred_b);
let uid = unsafe { geteuid() };
let gid = unsafe { getegid() };
assert_eq!(cred_a.uid, uid);
assert_eq!(cred_a.gid, gid);
}
}