extern int send_key_changed(connection_t*, node_t*);
extern int send_req_key(connection_t*, node_t*, node_t*);
extern int send_ans_key(connection_t*, node_t*, node_t*, char*);
extern int send_key_changed(connection_t*, node_t*);
extern int send_req_key(connection_t*, node_t*, node_t*);
extern int send_ans_key(connection_t*, node_t*, node_t*, char*);