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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| package dns | ||
|
|
||
| import ( | ||
| "net" | ||
| "strings" | ||
|
|
||
| "github.com/miekg/dns" | ||
| "github.com/monoxane/vxconnect/internal/controller" | ||
| "github.com/monoxane/vxconnect/internal/logging" | ||
| ) | ||
|
|
||
| var ( | ||
| server *Server | ||
| ) | ||
|
|
||
| type Server struct { | ||
| service *dns.Server | ||
| log logging.Logger | ||
| } | ||
|
|
||
| func New() *Server { | ||
| server = &Server{ | ||
| service: &dns.Server{Addr: ":53", Net: "udp"}, | ||
| log: logging.Log.With().Str("package", "dns").Logger(), | ||
| } | ||
|
|
||
| dns.HandleFunc(".", handleRequest) | ||
|
|
||
| return server | ||
| } | ||
|
|
||
| func (server *Server) Run() { | ||
| go func() { | ||
| err := server.service.ListenAndServe() | ||
| if err != nil { | ||
| server.log.Fatal().Err(err).Msg("unable to start DNS service") | ||
| } | ||
| }() | ||
| } | ||
|
|
||
| func handleRequest(w dns.ResponseWriter, r *dns.Msg) { | ||
| server.HandleRequest(w, r) | ||
| } | ||
|
|
||
| func (server *Server) HandleRequest(w dns.ResponseWriter, r *dns.Msg) { | ||
| m := new(dns.Msg) | ||
| m.SetReply(r) | ||
|
|
||
| name := strings.TrimSuffix(r.Question[0].Name, ".") | ||
|
|
||
| record := controller.QueryRecord(name) | ||
| if record != nil { | ||
| hdr := dns.RR_Header{Name: r.Question[0].Name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: uint32(record.TTL)} | ||
| switch record.Type { | ||
| case "CNAME": | ||
| m.Answer = []dns.RR{&dns.CNAME{Hdr: hdr, Target: record.Target}} | ||
| case "A": | ||
| ip := net.ParseIP(record.Target) | ||
| m.Answer = []dns.RR{&dns.A{Hdr: hdr, A: ip}} | ||
| } | ||
| server.log.Debug().Str("name", name).Interface("record", record).Msg("serving record") | ||
| } | ||
|
|
||
| err := w.WriteMsg(m) | ||
| if err != nil { | ||
| server.log.Error().Err(err).Msg("unable to write dns answer") | ||
| } | ||
| } |
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