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// dns utils
package utils
import (
"github.com/miekg/dns"
)
// build the question section of a dns packet
func QuestionMaker(domain string, qclass uint16, qtype uint16) *dns.Question {
return &dns.Question{Name: dns.Fqdn(domain), Qtype: qtype, Qclass: qclass}
}
// build a specific query message
func QueryMaker(domain string, rd bool, qclass uint16, qtype uint16, edns bool) *dns.Msg {
msg := new(dns.Msg)
msg.Id = dns.Id()
msg.RecursionDesired = rd
msg.Question = make([]dns.Question, 1)
msg.Question[0] = *QuestionMaker(domain, qclass, qtype)
if edns {
msg = msg.SetEdns0(4096, false)
}
return msg
}
// query and receive the response
func DNSQuery(addr string, domain string, rd bool, qclass uint16, qtype uint16, edns bool) (*dns.Msg, error) {
msg := QueryMaker(domain, rd, qclass, qtype, edns)
res, err := dns.Exchange(msg, addr)
return res, err
}
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