void cache_answer(struct interface *iface, uint8_t *base, int blen,
char *name, struct dns_answer *a, uint8_t *rdata, int flush);
int cache_host_is_known(char *record);
void cache_answer(struct interface *iface, uint8_t *base, int blen,
char *name, struct dns_answer *a, uint8_t *rdata, int flush);
int cache_host_is_known(char *record);