1 files changed, 48 insertions, 0 deletions
diff --git a/third_party/rust/getrandom/src/solaris_illumos.rs b/third_party/rust/getrandom/src/solaris_illumos.rs
new file mode 100644
index 0000000000..cf3067d6d8
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+++ b/third_party/rust/getrandom/src/solaris_illumos.rs
@@ -0,0 +1,48 @@
+// 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 the Solaris family
+//!
+//! Read from `/dev/random`, with chunks of limited size (256 bytes).
+//! `/dev/random` uses the Hash_DRBG with SHA512 algorithm from NIST SP 800-90A.
+//! `/dev/urandom` uses the FIPS 186-2 algorithm, which is considered less
+//! secure. We choose to read from `/dev/random`.
+//!
+//! Since Solaris 11.3 and mid-2015 illumos, the `getrandom` syscall is available.
+//! To make sure we can compile on both Solaris and its derivatives, as well as
+//! function, we check for the existence of getrandom(2) in libc by calling
+//! libc::dlsym.
+use crate::{
+    use_file,
+    util_libc::{sys_fill_exact, Weak},
+    Error,
+};
+use core::mem;
+
+#[cfg(target_os = "illumos")]
+type GetRandomFn = unsafe extern "C" fn(*mut u8, libc::size_t, libc::c_uint) -> libc::ssize_t;
+#[cfg(target_os = "solaris")]
+type GetRandomFn = unsafe extern "C" fn(*mut u8, libc::size_t, libc::c_uint) -> libc::c_int;
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    // getrandom(2) was introduced in Solaris 11.3 for Illumos in 2015.
+    static GETRANDOM: Weak = unsafe { Weak::new("getrandom\0") };
+    if let Some(fptr) = GETRANDOM.ptr() {
+        let func: GetRandomFn = unsafe { mem::transmute(fptr) };
+        // 256 bytes is the lowest common denominator across all the Solaris
+        // derived platforms for atomically obtaining random data.
+        for chunk in dest.chunks_mut(256) {
+            sys_fill_exact(chunk, |buf| unsafe {
+                func(buf.as_mut_ptr(), buf.len(), 0) as libc::ssize_t
+            })?
+        }
+        Ok(())
+    } else {
+        use_file::getrandom_inner(dest)
+    }
+}