Add function to fetch EAP Session-Id from EAPOL supplicant

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/eapol_supp/eapol_supp_sm.c

@@ -1556,6 +1556,24 @@ key_fetched:
 }
 
 
+/**
+ * eapol_sm_get_session_id - Get EAP Session-Id
+ * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
+ * @len: Pointer to variable that will be set to number of bytes in the session
+ * Returns: Pointer to the EAP Session-Id or %NULL on failure
+ *
+ * The Session-Id is available only after a successful authentication.
+ */
+const u8 * eapol_sm_get_session_id(struct eapol_sm *sm, size_t *len)
+{
+	if (sm == NULL || !eap_key_available(sm->eap)) {
+		wpa_printf(MSG_DEBUG, "EAPOL: EAP Session-Id not available");
+		return NULL;
+	}
+	return eap_get_eapSessionId(sm->eap, len);
+}
+
+
 /**
  * eapol_sm_notify_logoff - Notification of logon/logoff commands
  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()

src/eapol_supp/eapol_supp_sm.h

@@ -285,6 +285,7 @@ void eapol_sm_notify_config(struct eapol_sm *sm,
 			    struct eap_peer_config *config,
 			    const struct eapol_config *conf);
 int eapol_sm_get_key(struct eapol_sm *sm, u8 *key, size_t len);
+const u8 * eapol_sm_get_session_id(struct eapol_sm *sm, size_t *len);
 void eapol_sm_notify_logoff(struct eapol_sm *sm, Boolean logoff);
 void eapol_sm_notify_cached(struct eapol_sm *sm);
 void eapol_sm_notify_pmkid_attempt(struct eapol_sm *sm, int attempt);