session support get/set current packet

src/session/session.cpp

@@ -294,11 +294,19 @@ void session_set_s2c_1st_md(struct session *sess, struct metadata *md)
 
 struct metadata *session_get0_c2s_1st_md(struct session *sess)
 {
+    if (sess->c2s_1st_md.len == 0)
+    {
+        return NULL;
+    }
     return &sess->c2s_1st_md;
 }
 
 struct metadata *session_get0_s2c_1st_md(struct session *sess)
 {
+    if (sess->s2c_1st_md.len == 0)
+    {
+        return NULL;
+    }
     return &sess->s2c_1st_md;
 }
 
@@ -323,6 +331,36 @@ uint64_t session_get_last_time(struct session *sess)
     return sess->last_time;
 }
 
+/******************************************************************************
+ * session current packet
+ ******************************************************************************/
+
+// session current packet
+void session_set0_cur_pkt(struct session *sess, const struct packet *pkt)
+{
+    sess->cur_pkt = pkt;
+}
+
+struct packet *session_get0_cur_pkt(struct session *sess)
+{
+    return sess->cur_pkt;
+}
+
+// session current dir
+void session_set_cur_dir(struct session *sess, enum session_dir dir)
+{
+    sess->cur_dir = dir;
+}
+
+enum session_dir session_get_cur_dir(struct session *sess)
+{
+    return sess->cur_dir;
+}
+
+/******************************************************************************
+ * session event
+ ******************************************************************************/
+
 // session event
 bool session_push_event(struct session *sess, uint32_t event)
 {