diff options
author | Joel Galenson <jgalenson@google.com> | 2020-07-07 13:20:14 -0700 |
---|---|---|
committer | Joel Galenson <jgalenson@google.com> | 2020-07-07 13:38:10 -0700 |
commit | 4be0c6de7cc0c35144d78e245226e2d259b2524f (patch) | |
tree | d97ce5311c2d0e062e6efc8a93537787aada3660 /src/bsd_arandom.rs | |
parent | 65681d36bd49a53b9d21f6339eace04fa70b907f (diff) | |
download | getrandom-4be0c6de7cc0c35144d78e245226e2d259b2524f.tar.gz |
Import getrandom-0.1.14
Change-Id: I2e27b76bb8b37119712eeda01f94641a77cce5fd
Diffstat (limited to 'src/bsd_arandom.rs')
-rw-r--r-- | src/bsd_arandom.rs | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/bsd_arandom.rs b/src/bsd_arandom.rs new file mode 100644 index 0000000..eb564ff --- /dev/null +++ b/src/bsd_arandom.rs @@ -0,0 +1,49 @@ +// Copyright 2018 Developers of the Rand project. +// +// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or +// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license +// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +//! Implementation for FreeBSD and NetBSD +use crate::util_libc::sys_fill_exact; +use crate::Error; +use core::ptr; + +fn kern_arnd(buf: &mut [u8]) -> libc::ssize_t { + static MIB: [libc::c_int; 2] = [libc::CTL_KERN, libc::KERN_ARND]; + let mut len = buf.len(); + let ret = unsafe { + libc::sysctl( + MIB.as_ptr(), + MIB.len() as libc::c_uint, + buf.as_mut_ptr() as *mut _, + &mut len, + ptr::null(), + 0, + ) + }; + if ret == -1 { + error!("sysctl kern.arandom: syscall failed"); + -1 + } else { + len as libc::ssize_t + } +} + +pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> { + #[cfg(target_os = "freebsd")] + { + use crate::util_libc::Weak; + static GETRANDOM: Weak = unsafe { Weak::new("getrandom\0") }; + type GetRandomFn = + unsafe extern "C" fn(*mut u8, libc::size_t, libc::c_uint) -> libc::ssize_t; + + if let Some(fptr) = GETRANDOM.ptr() { + let func: GetRandomFn = unsafe { core::mem::transmute(fptr) }; + return sys_fill_exact(dest, |buf| unsafe { func(buf.as_mut_ptr(), buf.len(), 0) }); + } + } + sys_fill_exact(dest, kern_arnd) +} |