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46 lines
1.3 KiB
46 lines
1.3 KiB
package realm
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import "github.com/miekg/dns"
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// A Server listens for DNS requests over UDP and responds with answers from the provided Zone.
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type Server struct {
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server *dns.Server
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zones Zones
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}
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// NewServer returns a new initialized *Server that will bind to listen and will look up answers from zone.
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func NewServer(listen string, zones Zones) *Server {
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var s *Server
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s = &Server{zones: zones}
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s.server = &dns.Server{
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Addr: listen,
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Net: "udp",
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Handler: s,
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}
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return s
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}
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// ListenAndServe will start the nameserver on the configured address.
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func (s *Server) ListenAndServe() error {
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return s.server.ListenAndServe()
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}
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// ServeDNS will be called for every DNS request to this server.
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// It will attempt to provide answers to all questions from the configured zone.
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func (s *Server) ServeDNS(w dns.ResponseWriter, request *dns.Msg) {
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// Setup the default response
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var response *dns.Msg
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response = &dns.Msg{}
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response.SetReply(request)
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response.Compress = true
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// Lookup answers to any of the questions
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for _, question := range request.Question {
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var records []dns.RR
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records = s.zones.Lookup(question.Name, question.Qtype, question.Qclass)
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response.Answer = append(response.Answer, records...)
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}
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// Respond to the request
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w.WriteMsg(response)
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}
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