Implement SSL_session_reused

Author: ctz

rustls-libssl/MATRIX.md

@@ -410,7 +410,7 @@
 | `SSL_rstate_string_long`  |  |  |  |
 | `SSL_select_next_proto`  |  | :white_check_mark: | :white_check_mark: |
 | `SSL_sendfile`  |  |  |  |
-| `SSL_session_reused`  |  | :white_check_mark: | :exclamation: [^stub] |
+| `SSL_session_reused`  |  | :white_check_mark: | :white_check_mark: |
 | `SSL_set0_CA_list`  |  |  |  |
 | `SSL_set0_rbio`  |  |  | :white_check_mark: |
 | `SSL_set0_security_ex_data`  |  |  |  |

rustls-libssl/src/entry.rs

@@ -1244,6 +1244,12 @@ entry! {
     }
 }
 
+entry! {
+    pub fn _SSL_session_reused(ssl: *const SSL) -> c_int {
+        try_clone_arc!(ssl).get().was_session_reused() as c_int
+    }
+}
+
 impl Castable for SSL {
     type Ownership = OwnershipArc;
     type RustType = NotThreadSafe<SSL>;
@@ -1501,10 +1507,6 @@ entry_stub! {
     pub fn _SSL_set_session(_ssl: *mut SSL, _session: *mut SSL_SESSION) -> c_int;
 }
 
-entry_stub! {
-    pub fn _SSL_session_reused(_ssl: *const SSL) -> c_int;
-}
-
 entry_stub! {
     pub fn _SSL_get1_session(_ssl: *mut SSL) -> *mut SSL_SESSION;
 }

rustls-libssl/src/lib.rs

@@ -15,8 +15,8 @@ use rustls::crypto::aws_lc_rs as provider;
 use rustls::pki_types::{CertificateDer, ServerName};
 use rustls::server::{Accepted, Acceptor};
 use rustls::{
-    CipherSuite, ClientConfig, ClientConnection, Connection, ProtocolVersion, RootCertStore,
-    ServerConfig, SupportedProtocolVersion,
+    CipherSuite, ClientConfig, ClientConnection, Connection, HandshakeKind, ProtocolVersion,
+    RootCertStore, ServerConfig, SupportedProtocolVersion,
 };
 
 use not_thread_safe::NotThreadSafe;
@@ -1168,6 +1168,13 @@ impl Ssl {
             None => HandshakeState::Before,
         }
     }
+
+    fn was_session_reused(&self) -> bool {
+        match self.conn() {
+            Some(conn) => conn.handshake_kind() == Some(HandshakeKind::Resumed),
+            None => false,
+        }
+    }
 }
 
 /// Encode rustls's internal representation in the wire format.