void *data;
};
-extern struct dns_query *lookup_hostname(const char *ip, int aftype, DNSCB callback, void *data);
+extern struct dns_query *lookup_hostname(const char *ip, DNSCB callback, void *data);
extern struct dns_query *lookup_ip(const char *host, int aftype, DNSCB callback, void *data);
extern void cancel_query(struct dns_query *query);