dns_name_copy
dns_name_copy(name, domain, NULL);
result = dns_name_copy(name, lookup->name,
dns_name_copy(dns_fixedname_name(&lookold->fdomain),
dns_name_copy(&cname.cname, qname, NULL);
dns_name_copy(query->lookup->name, name, NULL);
dns_name_copy(dns_name_t *source, dns_name_t *dest, isc_buffer_t *target);