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