mv std libs to library/
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mark
230
library/std/src/sys/unix/rand.rs
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230
library/std/src/sys/unix/rand.rs
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@@ -0,0 +1,230 @@
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use crate::mem;
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use crate::slice;
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pub fn hashmap_random_keys() -> (u64, u64) {
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let mut v = (0, 0);
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unsafe {
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let view = slice::from_raw_parts_mut(&mut v as *mut _ as *mut u8, mem::size_of_val(&v));
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imp::fill_bytes(view);
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}
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v
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}
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#[cfg(all(
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unix,
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not(target_os = "macos"),
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not(target_os = "ios"),
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not(target_os = "openbsd"),
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not(target_os = "freebsd"),
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not(target_os = "netbsd"),
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not(target_os = "fuchsia"),
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not(target_os = "redox")
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))]
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mod imp {
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use crate::fs::File;
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use crate::io::Read;
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#[cfg(any(target_os = "linux", target_os = "android"))]
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fn getrandom(buf: &mut [u8]) -> libc::c_long {
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unsafe {
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libc::syscall(libc::SYS_getrandom, buf.as_mut_ptr(), buf.len(), libc::GRND_NONBLOCK)
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}
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}
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#[cfg(not(any(target_os = "linux", target_os = "android")))]
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fn getrandom_fill_bytes(_buf: &mut [u8]) -> bool {
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false
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}
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#[cfg(any(target_os = "linux", target_os = "android"))]
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fn getrandom_fill_bytes(v: &mut [u8]) -> bool {
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use crate::sync::atomic::{AtomicBool, Ordering};
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use crate::sys::os::errno;
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static GETRANDOM_UNAVAILABLE: AtomicBool = AtomicBool::new(false);
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if GETRANDOM_UNAVAILABLE.load(Ordering::Relaxed) {
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return false;
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}
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let mut read = 0;
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while read < v.len() {
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let result = getrandom(&mut v[read..]);
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if result == -1 {
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let err = errno() as libc::c_int;
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if err == libc::EINTR {
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continue;
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} else if err == libc::ENOSYS || err == libc::EPERM {
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// Fall back to reading /dev/urandom if `getrandom` is not
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// supported on the current kernel.
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//
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// Also fall back in case it is disabled by something like
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// seccomp or inside of virtual machines.
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GETRANDOM_UNAVAILABLE.store(true, Ordering::Relaxed);
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return false;
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} else if err == libc::EAGAIN {
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return false;
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} else {
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panic!("unexpected getrandom error: {}", err);
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}
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} else {
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read += result as usize;
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}
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}
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true
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}
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pub fn fill_bytes(v: &mut [u8]) {
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// getrandom_fill_bytes here can fail if getrandom() returns EAGAIN,
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// meaning it would have blocked because the non-blocking pool (urandom)
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// has not initialized in the kernel yet due to a lack of entropy. The
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// fallback we do here is to avoid blocking applications which could
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// depend on this call without ever knowing they do and don't have a
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// work around. The PRNG of /dev/urandom will still be used but over a
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// possibly predictable entropy pool.
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if getrandom_fill_bytes(v) {
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return;
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}
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// getrandom failed because it is permanently or temporarily (because
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// of missing entropy) unavailable. Open /dev/urandom, read from it,
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// and close it again.
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let mut file = File::open("/dev/urandom").expect("failed to open /dev/urandom");
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file.read_exact(v).expect("failed to read /dev/urandom")
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}
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}
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#[cfg(target_os = "macos")]
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mod imp {
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use crate::fs::File;
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use crate::io::Read;
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use crate::sys::os::errno;
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use libc::{c_int, c_void, size_t};
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fn getentropy_fill_bytes(v: &mut [u8]) -> bool {
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weak!(fn getentropy(*mut c_void, size_t) -> c_int);
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getentropy
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.get()
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.map(|f| {
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// getentropy(2) permits a maximum buffer size of 256 bytes
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for s in v.chunks_mut(256) {
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let ret = unsafe { f(s.as_mut_ptr() as *mut c_void, s.len()) };
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if ret == -1 {
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panic!("unexpected getentropy error: {}", errno());
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}
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}
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true
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})
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.unwrap_or(false)
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}
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pub fn fill_bytes(v: &mut [u8]) {
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if getentropy_fill_bytes(v) {
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return;
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}
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// for older macos which doesn't support getentropy
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let mut file = File::open("/dev/urandom").expect("failed to open /dev/urandom");
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file.read_exact(v).expect("failed to read /dev/urandom")
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}
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}
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#[cfg(target_os = "openbsd")]
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mod imp {
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use crate::sys::os::errno;
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pub fn fill_bytes(v: &mut [u8]) {
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// getentropy(2) permits a maximum buffer size of 256 bytes
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for s in v.chunks_mut(256) {
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let ret = unsafe { libc::getentropy(s.as_mut_ptr() as *mut libc::c_void, s.len()) };
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if ret == -1 {
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panic!("unexpected getentropy error: {}", errno());
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}
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}
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}
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}
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// On iOS and MacOS `SecRandomCopyBytes` calls `CCRandomCopyBytes` with
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// `kCCRandomDefault`. `CCRandomCopyBytes` manages a CSPRNG which is seeded
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// from `/dev/random` and which runs on its own thread accessed via GCD.
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// This seems needlessly heavyweight for the purposes of generating two u64s
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// once per thread in `hashmap_random_keys`. Therefore `SecRandomCopyBytes` is
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// only used on iOS where direct access to `/dev/urandom` is blocked by the
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// sandbox.
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#[cfg(target_os = "ios")]
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mod imp {
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use crate::io;
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use crate::ptr;
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use libc::{c_int, size_t};
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enum SecRandom {}
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#[allow(non_upper_case_globals)]
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const kSecRandomDefault: *const SecRandom = ptr::null();
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extern "C" {
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fn SecRandomCopyBytes(rnd: *const SecRandom, count: size_t, bytes: *mut u8) -> c_int;
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}
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pub fn fill_bytes(v: &mut [u8]) {
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let ret = unsafe { SecRandomCopyBytes(kSecRandomDefault, v.len(), v.as_mut_ptr()) };
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if ret == -1 {
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panic!("couldn't generate random bytes: {}", io::Error::last_os_error());
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}
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}
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}
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#[cfg(any(target_os = "freebsd", target_os = "netbsd"))]
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mod imp {
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use crate::ptr;
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pub fn fill_bytes(v: &mut [u8]) {
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let mib = [libc::CTL_KERN, libc::KERN_ARND];
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// kern.arandom permits a maximum buffer size of 256 bytes
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for s in v.chunks_mut(256) {
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let mut s_len = s.len();
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let ret = unsafe {
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libc::sysctl(
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mib.as_ptr(),
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mib.len() as libc::c_uint,
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s.as_mut_ptr() as *mut _,
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&mut s_len,
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ptr::null(),
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0,
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)
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};
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if ret == -1 || s_len != s.len() {
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panic!(
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"kern.arandom sysctl failed! (returned {}, s.len() {}, oldlenp {})",
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ret,
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s.len(),
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s_len
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);
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}
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}
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}
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}
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#[cfg(target_os = "fuchsia")]
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mod imp {
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#[link(name = "zircon")]
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extern "C" {
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fn zx_cprng_draw(buffer: *mut u8, len: usize);
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}
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pub fn fill_bytes(v: &mut [u8]) {
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unsafe { zx_cprng_draw(v.as_mut_ptr(), v.len()) }
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}
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}
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#[cfg(target_os = "redox")]
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mod imp {
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use crate::fs::File;
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use crate::io::Read;
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pub fn fill_bytes(v: &mut [u8]) {
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// Open rand:, read from it, and close it again.
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let mut file = File::open("rand:").expect("failed to open rand:");
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file.read_exact(v).expect("failed to read rand:")
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}
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}
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