func newConnMsg(qname, nameserver string, attempts int, qtype, qclass uint16, aa, ad, cd, rd, dnssec, nsid bool) (*dns.Conn, *dns.Msg) { d := new(dns.Conn) d.RemoteAddr = nameserver d.Attempts = attempts m := new(dns.Msg) m.MsgHdr.Authoritative = aa m.MsgHdr.AuthenticatedData = ad m.MsgHdr.CheckingDisabled = cd m.MsgHdr.RecursionDesired = rd m.Question = make([]dns.Question, 1) if dnssec || nsid { opt := new(dns.RR_OPT) opt.SetDo() opt.SetVersion(0) opt.SetUDPSize(dns.DefaultMsgSize) if nsid { opt.SetNsid("") } m.Extra = make([]dns.RR, 1) m.Extra[0] = opt } m.Question[0] = dns.Question{qname, qtype, qclass} m.Id = dns.Id() return d, m }