add event_timeout method to SslRef

openssl/src/ssl/mod.rs

@@ -104,6 +104,8 @@ use std::path::Path;
 use std::ptr;
 use std::str;
 use std::sync::{Arc, Mutex};
+#[cfg(ossl320)]
+use std::time::Duration;
 
 pub use crate::ssl::connector::{
     ConnectConfiguration, SslAcceptor, SslAcceptorBuilder, SslConnector, SslConnectorBuilder,
@@ -3470,6 +3472,38 @@ impl SslRef {
             }
         }
     }
+
+    /// Returns a duration after which openssl needs to be called again to handle
+    /// time sensitive events. The duration may be ZERO, indicating that there are
+    /// events that need to be handled immediatly.
+    #[corresponds(SSL_get_event_timeout)]
+    #[cfg(ossl320)]
+    pub fn event_timeout(&self) -> Result<Option<Duration>, ErrorStack> {
+        unsafe {
+            let mut tv = libc::timeval {
+                tv_sec: 0,
+                tv_usec: 0,
+            };
+            let mut is_infinite = 0;
+
+            cvt(ffi::SSL_get_event_timeout(
+                self.as_ptr(),
+                &mut tv,
+                &mut is_infinite,
+            ))?;
+
+            if is_infinite == 1 {
+                return Ok(None);
+            }
+
+            let timeout = Duration::new(
+                u64::try_from(tv.tv_sec).unwrap(),
+                u32::try_from(tv.tv_usec).unwrap() * 1000,
+            );
+
+            Ok(Some(timeout))
+        }
+    }
 }
 
 /// An SSL stream midway through the handshake process.