use wait and retransmit when receiving session tickets

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/ext/session_ticket.c b/lib/ext/session_ticket.c
index 35bad36f12..a51402bef0 100644
--- a/lib/ext/session_ticket.c
+++ b/lib/ext/session_ticket.c
@@ -33,6 +33,7 @@
 #include <gnutls_mbuffers.h>
 #include <gnutls_extensions.h>
 #include <gnutls_constate.h>
+#include <gnutls_dtls.h>
 
 #ifdef ENABLE_SESSION_TICKETS
 
@@ -644,6 +645,17 @@ int _gnutls_recv_new_session_ticket(gnutls_session_t session)
 	if (!priv->session_ticket_renew)
 		return 0;
 
+	/* This is the last flight and peer cannot be sure
+	 * we have received it unless we notify him. So we
+	 * wait for a message and retransmit if needed. */
+	if (IS_DTLS(session) && !_dtls_is_async(session) &&
+	    (gnutls_record_check_pending(session) +
+	     record_check_unprocessed(session)) == 0) {
+		ret = _dtls_wait_and_retransmit(session);
+		if (ret < 0)
+			return gnutls_assert_val(ret);
+	}
+
 	ret = _gnutls_recv_handshake(session,
 				     GNUTLS_HANDSHAKE_NEW_SESSION_TICKET,
 				     0, &buf);