90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
package kubernetes
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import (
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"context"
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"github.com/coredns/coredns/plugin"
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"github.com/coredns/coredns/request"
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"github.com/miekg/dns"
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)
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// ServeDNS implements the plugin.Handler interface.
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func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
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opt := plugin.Options{}
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state := request.Request{W: w, Req: r, Context: ctx}
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m := new(dns.Msg)
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m.SetReply(r)
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m.Authoritative, m.RecursionAvailable = true, true
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zone := plugin.Zones(k.Zones).Matches(state.Name())
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if zone == "" {
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return plugin.NextOrFailure(k.Name(), k.Next, ctx, w, r)
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}
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state.Zone = zone
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var (
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records []dns.RR
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extra []dns.RR
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err error
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)
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switch state.QType() {
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case dns.TypeA:
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records, err = plugin.A(&k, zone, state, nil, opt)
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case dns.TypeAAAA:
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records, err = plugin.AAAA(&k, zone, state, nil, opt)
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case dns.TypeTXT:
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records, err = plugin.TXT(&k, zone, state, opt)
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case dns.TypeCNAME:
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records, err = plugin.CNAME(&k, zone, state, opt)
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case dns.TypePTR:
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records, err = plugin.PTR(&k, zone, state, opt)
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case dns.TypeMX:
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records, extra, err = plugin.MX(&k, zone, state, opt)
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case dns.TypeSRV:
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records, extra, err = plugin.SRV(&k, zone, state, opt)
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case dns.TypeSOA:
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records, err = plugin.SOA(&k, zone, state, opt)
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case dns.TypeNS:
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if state.Name() == zone {
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records, extra, err = plugin.NS(&k, zone, state, opt)
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break
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}
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fallthrough
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case dns.TypeAXFR, dns.TypeIXFR:
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k.Transfer(ctx, state)
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default:
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// Do a fake A lookup, so we can distinguish between NODATA and NXDOMAIN
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_, err = plugin.A(&k, zone, state, nil, opt)
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}
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if k.IsNameError(err) {
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if k.Fall.Through(state.Name()) {
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return plugin.NextOrFailure(k.Name(), k.Next, ctx, w, r)
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}
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if !k.APIConn.HasSynced() {
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// If we haven't synchronized with the kubernetes cluster, return server failure
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return plugin.BackendError(&k, zone, dns.RcodeServerFailure, state, nil /* err */, opt)
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}
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return plugin.BackendError(&k, zone, dns.RcodeNameError, state, nil /* err */, opt)
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}
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if err != nil {
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return dns.RcodeServerFailure, err
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}
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if len(records) == 0 {
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return plugin.BackendError(&k, zone, dns.RcodeSuccess, state, nil, opt)
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}
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m.Answer = append(m.Answer, records...)
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m.Extra = append(m.Extra, extra...)
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w.WriteMsg(m)
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return dns.RcodeSuccess, nil
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}
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// Name implements the Handler interface.
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func (k Kubernetes) Name() string { return "kubernetes" }
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