extern int send_key_changed(conn_list_t*, conn_list_t*);
extern int send_req_key(conn_list_t*, conn_list_t*);
extern int send_ans_key(conn_list_t*, conn_list_t*, char*);
extern int send_key_changed(conn_list_t*, conn_list_t*);
extern int send_req_key(conn_list_t*, conn_list_t*);
extern int send_ans_key(conn_list_t*, conn_list_t*, char*);