Expose SSL_get_max_proto_version

boring/src/ssl/mod.rs

@@ -1432,7 +1432,7 @@ impl SslContextBuilder {
     ///
     /// This corresponds to [`SSL_CTX_get_max_proto_version`].
     ///
-    /// [`SSL_CTX_get_max_proto_version`]: https://www.openssl.org/docs/man1.1.0/ssl/SSL_set_min_proto_version.html
+    /// [`SSL_CTX_get_max_proto_version`]: https://www.openssl.org/docs/man3.1/man3/SSL_CTX_get_max_proto_version.html
     pub fn max_proto_version(&mut self) -> Option<SslVersion> {
         unsafe {
             let r = ffi::SSL_CTX_get_max_proto_version(self.as_ptr());
@@ -3168,6 +3168,23 @@ impl SslRef {
         str::from_utf8(version.to_bytes()).unwrap()
     }
 
+    /// Gets the maximum supported protocol version.
+    ///
+    /// A value of `None` indicates that all versions down the the highest version supported by
+    /// OpenSSL are enabled.
+    ///
+    /// This corresponds to [`SSL_get_max_proto_version`].
+    ///
+    /// [`SSL_get_max_proto_version`]: https://www.openssl.org/docs/man3.1/man3/SSL_get_max_proto_version.html
+    pub fn max_proto_version(&self) -> Option<SslVersion> {
+        let r = unsafe { ffi::SSL_get_max_proto_version(self.as_ptr()) };
+        if r == 0 {
+            None
+        } else {
+            Some(SslVersion(r))
+        }
+    }
+
     /// Returns the protocol selected via Application Layer Protocol Negotiation (ALPN).
     ///
     /// The protocol's name is returned is an opaque sequence of bytes. It is up to the client