func RenewDnsMsg(m *dns.Msg) {
m.Extra = nil
m.Answer = nil
m.AuthenticatedData = false
m.CheckingDisabled = false
m.Question = nil
}
/*
* makeMessage() - construct DNS message structure
*/
func makeMessage(c *Context, qname, qtype, qclass string, ext Extension) *dns.Msg {
m := new(dns.Msg)
m.Id = dns.Id()
if c.restype == RESOLUTION_STUB {
m.RecursionDesired = true
} else {
m.RecursionDesired = false
}
if c.adflag {
m.AuthenticatedData = true
}
if c.cdflag {
m.CheckingDisabled = true
}
if ext["dnssec_return_status"] || ext["dnssec_return_only_secure"] || ext["dnssec_return_validation_chain"] {
opt := new(dns.OPT)
opt.Hdr.Name = "."
opt.Hdr.Rrtype = dns.TypeOPT
opt.SetDo()
m.Extra = append(m.Extra, opt)
}
m.Question = make([]dns.Question, 1)
qtype_int, ok := dns.StringToType[strings.ToUpper(qtype)]
if !ok {
fmt.Printf("%s: Unrecognized query type.\n", qtype)
return nil
}
qclass_int, ok := dns.StringToClass[strings.ToUpper(qclass)]
if !ok {
fmt.Printf("%s: Unrecognized query class.\n", qclass)
return nil
}
m.Question[0] = dns.Question{qname, qtype_int, qclass_int}
return m
}