rk_dns_type_to_string
printf("%-30s %-5s %-6d ", rr->domain, rk_dns_type_to_string(rr->type), rr->ttl);
const char *type_string = rk_dns_type_to_string (sig->type);
rr_class, rk_dns_type_to_string(rr_type), len);
domain, rr_class, rk_dns_type_to_string(rr_type), size);
rk_dns_type_to_string(int type);