caps 0.5.3

A pure-Rust library to work with Linux capabilities
Documentation 
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

use crate::errors::CapsError;
use crate::nr;
use crate::runtime;
use crate::Capability;

pub fn clear() -> Result<(), CapsError> {
    for c in super::all() {
        if has_cap(c)? {
            drop(c)?;
        }
    }
    Ok(())
}

pub fn drop(cap: Capability) -> Result<(), CapsError> {
    let ret = unsafe { libc::prctl(nr::PR_CAPBSET_DROP, libc::c_uint::from(cap.index()), 0, 0) };
    match ret {
        0 => Ok(()),
        _ => Err(CapsError::from(format!(
            "PR_CAPBSET_DROP failure, errno {}",
            errno::errno()
        ))),
    }
}

pub fn has_cap(cap: Capability) -> Result<bool, CapsError> {
    let ret = unsafe { libc::prctl(nr::PR_CAPBSET_READ, libc::c_uint::from(cap.index()), 0, 0) };
    match ret {
        0 => Ok(false),
        1 => Ok(true),
        _ => Err(CapsError::from(format!(
            "PR_CAPBSET_READ failure, errno {}",
            errno::errno()
        ))),
    }
}

pub fn read() -> Result<super::CapsHashSet, CapsError> {
    let mut res = super::CapsHashSet::new();
    for c in runtime::thread_all_supported() {
        if has_cap(c)? {
            res.insert(c);
        }
    }
    Ok(res)
}