1 files changed, 37 insertions, 0 deletions
diff --git a/src/rust/external/external.rs b/src/rust/external/external.rs
new file mode 100644
index 0000000000..0d324c8820
--- /dev/null
+++ b/src/rust/external/external.rs
@@ -0,0 +1,37 @@
+// Copyright (c) 2016-2019, The Tor Project, Inc. */
+// See LICENSE for licensing information */
+
+use libc::{c_char, c_int};
+use std::ffi::CString;
+
+extern "C" {
+    fn tor_version_as_new_as(platform: *const c_char, cutoff: *const c_char) -> c_int;
+}
+
+/// Wrap calls to tor_version_as_new_as, defined in routerparse.c
+pub fn c_tor_version_as_new_as(platform: &str, cutoff: &str) -> bool {
+    // CHK: These functions should log a warning if an error occurs. This
+    // can be added when integration with tor's logger is added to rust
+    let c_platform = match CString::new(platform) {
+        Ok(n) => n,
+        Err(_) => return false,
+    };
+
+    let c_cutoff = match CString::new(cutoff) {
+        Ok(n) => n,
+        Err(_) => return false,
+    };
+
+    let result: c_int = unsafe { tor_version_as_new_as(c_platform.as_ptr(), c_cutoff.as_ptr()) };
+
+    result == 1
+}
+
+extern "C" {
+    fn tor_is_using_nss() -> c_int;
+}
+
+/// Return true if Tor was built to use NSS.
+pub fn c_tor_is_using_nss() -> bool {
+    0 != unsafe { tor_is_using_nss() }
+}