mirror of
https://github.com/coredns/coredns.git
synced 2025-11-03 18:53:13 -05:00
87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
package kubernetes
|
|
|
|
import (
|
|
"github.com/coredns/coredns/plugin"
|
|
"github.com/coredns/coredns/plugin/pkg/dnsutil"
|
|
"github.com/coredns/coredns/request"
|
|
|
|
"github.com/miekg/dns"
|
|
"golang.org/x/net/context"
|
|
)
|
|
|
|
// ServeDNS implements the plugin.Handler interface.
|
|
func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
|
|
state := request.Request{W: w, Req: r}
|
|
|
|
m := new(dns.Msg)
|
|
m.SetReply(r)
|
|
m.Authoritative, m.RecursionAvailable, m.Compress = true, true, true
|
|
|
|
zone := plugin.Zones(k.Zones).Matches(state.Name())
|
|
if zone == "" {
|
|
return plugin.NextOrFailure(k.Name(), k.Next, ctx, w, r)
|
|
}
|
|
|
|
state.Zone = zone
|
|
|
|
var (
|
|
records []dns.RR
|
|
extra []dns.RR
|
|
err error
|
|
)
|
|
|
|
switch state.QType() {
|
|
case dns.TypeA:
|
|
records, err = plugin.A(&k, zone, state, nil, plugin.Options{})
|
|
case dns.TypeAAAA:
|
|
records, err = plugin.AAAA(&k, zone, state, nil, plugin.Options{})
|
|
case dns.TypeTXT:
|
|
records, err = plugin.TXT(&k, zone, state, plugin.Options{})
|
|
case dns.TypeCNAME:
|
|
records, err = plugin.CNAME(&k, zone, state, plugin.Options{})
|
|
case dns.TypePTR:
|
|
records, err = plugin.PTR(&k, zone, state, plugin.Options{})
|
|
case dns.TypeMX:
|
|
records, extra, err = plugin.MX(&k, zone, state, plugin.Options{})
|
|
case dns.TypeSRV:
|
|
records, extra, err = plugin.SRV(&k, zone, state, plugin.Options{})
|
|
case dns.TypeSOA:
|
|
records, err = plugin.SOA(&k, zone, state, plugin.Options{})
|
|
case dns.TypeNS:
|
|
if state.Name() == zone {
|
|
records, extra, err = plugin.NS(&k, zone, state, plugin.Options{})
|
|
break
|
|
}
|
|
fallthrough
|
|
default:
|
|
// Do a fake A lookup, so we can distinguish between NODATA and NXDOMAIN
|
|
_, err = plugin.A(&k, zone, state, nil, plugin.Options{})
|
|
}
|
|
|
|
if k.IsNameError(err) {
|
|
if k.Fallthrough {
|
|
return plugin.NextOrFailure(k.Name(), k.Next, ctx, w, r)
|
|
}
|
|
return plugin.BackendError(&k, zone, dns.RcodeNameError, state, nil /* err */, plugin.Options{})
|
|
}
|
|
if err != nil {
|
|
return dns.RcodeServerFailure, err
|
|
}
|
|
|
|
if len(records) == 0 {
|
|
return plugin.BackendError(&k, zone, dns.RcodeSuccess, state, nil, plugin.Options{})
|
|
}
|
|
|
|
m.Answer = append(m.Answer, records...)
|
|
m.Extra = append(m.Extra, extra...)
|
|
|
|
m = dnsutil.Dedup(m)
|
|
state.SizeAndDo(m)
|
|
m, _ = state.Scrub(m)
|
|
w.WriteMsg(m)
|
|
return dns.RcodeSuccess, nil
|
|
}
|
|
|
|
// Name implements the Handler interface.
|
|
func (k Kubernetes) Name() string { return "kubernetes" }
|