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// Package auto implements an on-the-fly loading file backend.
package auto
import (
"context"
"regexp"
"time"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/file"
"github.com/coredns/coredns/plugin/metrics"
"github.com/coredns/coredns/plugin/pkg/upstream"
"github.com/coredns/coredns/plugin/transfer"
"github.com/coredns/coredns/request"
"github.com/miekg/dns"
)
type (
// Auto holds the zones and the loader configuration for automatically loading zones.
Auto struct {
Next plugin.Handler
*Zones
metrics *metrics.Metrics
transfer *transfer.Transfer
loader
}
loader struct {
directory string
template string
re *regexp.Regexp
ReloadInterval time.Duration
upstream *upstream.Upstream // Upstream for looking up names during the resolution process.
}
)
// ServeDNS implements the plugin.Handler interface.
func (a Auto) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
state := request.Request{W: w, Req: r}
qname := state.Name()
// Precheck with the origins, i.e. are we allowed to look here?
zone := plugin.Zones(a.Zones.Origins()).Matches(qname)
if zone == "" {
return plugin.NextOrFailure(a.Name(), a.Next, ctx, w, r)
}
// Now the real zone.
zone = plugin.Zones(a.Zones.Names()).Matches(qname)
if zone == "" {
return plugin.NextOrFailure(a.Name(), a.Next, ctx, w, r)
}
a.Zones.RLock()
z, ok := a.Zones.Z[zone]
a.Zones.RUnlock()
if !ok || z == nil {
return dns.RcodeServerFailure, nil
}
// If transfer is not loaded, we'll see these, answer with refused (no transfer allowed).
if state.QType() == dns.TypeAXFR || state.QType() == dns.TypeIXFR {
return dns.RcodeRefused, nil
}
answer, ns, extra, result := z.Lookup(ctx, state, qname)
m := new(dns.Msg)
m.SetReply(r)
m.Authoritative = true
m.Answer, m.Ns, m.Extra = answer, ns, extra
switch result {
case file.Success:
case file.NoData:
case file.NameError:
m.Rcode = dns.RcodeNameError
case file.Delegation:
m.Authoritative = false
case file.ServerFailure:
return dns.RcodeServerFailure, nil
}
w.WriteMsg(m)
return dns.RcodeSuccess, nil
}
// Name implements the Handler interface.
func (a Auto) Name() string { return "auto" }
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