Support the client hello callback

1 files changed, 28 insertions, 1 deletions

diff --git a/openssl/src/ssl/callbacks.rs b/openssl/src/ssl/callbacks.rs
index daa58a4e..18aba527 100644
--- a/openssl/src/ssl/callbacks.rs
+++ b/openssl/src/ssl/callbacks.rs
@@ -23,7 +23,7 @@ use pkey::Params;
 #[cfg(any(ossl102, libressl261))]
 use ssl::AlpnError;
 #[cfg(ossl111)]
-use ssl::ExtensionContext;
+use ssl::{ExtensionContext, ClientHelloResponse};
 use ssl::{SniError, Ssl, SslAlert, SslContext, SslContextRef, SslRef, SslSession, SslSessionRef};
 #[cfg(ossl111)]
 use x509::X509Ref;
@@ -655,3 +655,30 @@ where
         }
     }
 }
+
+#[cfg(ossl111)]
+pub unsafe extern "C" fn raw_client_hello<F>(
+    ssl: *mut ffi::SSL,
+    al: *mut c_int,
+    arg: *mut c_void,
+) -> c_int
+where
+    F: Fn(&mut SslRef, &mut SslAlert) -> Result<ClientHelloResponse, ErrorStack>
+        + 'static
+        + Sync
+        + Send,
+{
+    let ssl = SslRef::from_ptr_mut(ssl);
+    let callback = arg as *const F;
+    let mut alert = SslAlert(*al);
+
+    let r = (*callback)(ssl, &mut alert);
+    *al = alert.0;
+    match r {
+        Ok(c) => c.0,
+        Err(e) => {
+            e.put();
+            ffi::SSL_CLIENT_HELLO_ERROR
+        }
+    }
+}