c4ab98c6e3
This checks if the next middleware to be called is nil, and if so returns ServerFailure and an error. This makes the next calling more robust and saves some lines of code. Also prefix the error with the name of the middleware to aid in debugging.
100 lines
2.4 KiB
Go
100 lines
2.4 KiB
Go
// Package auto implements an on-the-fly loading file backend.
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package auto
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import (
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"errors"
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"regexp"
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"time"
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"github.com/miekg/coredns/middleware"
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"github.com/miekg/coredns/middleware/file"
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"github.com/miekg/coredns/middleware/metrics"
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"github.com/miekg/coredns/middleware/proxy"
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"github.com/miekg/coredns/request"
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"github.com/miekg/dns"
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"golang.org/x/net/context"
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)
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type (
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// Auto holds the zones and the loader configuration for automatically loading zones.
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Auto struct {
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Next middleware.Handler
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*Zones
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metrics *metrics.Metrics
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loader
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}
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loader struct {
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directory string
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template string
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re *regexp.Regexp
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// In the future this should be something like ZoneMeta that contains all this stuff.
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transferTo []string
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noReload bool
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proxy proxy.Proxy // Proxy for looking up names during the resolution process
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duration time.Duration
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}
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)
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// ServeDNS implements the middleware.Handle interface.
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func (a Auto) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
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state := request.Request{W: w, Req: r}
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if state.QClass() != dns.ClassINET {
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return dns.RcodeServerFailure, middleware.Error(a.Name(), errors.New("can only deal with ClassINET"))
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}
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qname := state.Name()
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// TODO(miek): match the qname better in the map
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// Precheck with the origins, i.e. are we allowed to looks here.
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zone := middleware.Zones(a.Zones.Origins()).Matches(qname)
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if zone == "" {
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return middleware.NextOrFailure(a.Name(), a.Next, ctx, w, r)
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}
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// Now the real zone.
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zone = middleware.Zones(a.Zones.Names()).Matches(qname)
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a.Zones.RLock()
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z, ok := a.Zones.Z[zone]
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a.Zones.RUnlock()
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if !ok || z == nil {
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return dns.RcodeServerFailure, nil
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}
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if state.QType() == dns.TypeAXFR || state.QType() == dns.TypeIXFR {
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xfr := file.Xfr{Zone: z}
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return xfr.ServeDNS(ctx, w, r)
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}
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answer, ns, extra, result := z.Lookup(state, qname)
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m := new(dns.Msg)
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m.SetReply(r)
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m.Authoritative, m.RecursionAvailable, m.Compress = true, true, true
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m.Answer, m.Ns, m.Extra = answer, ns, extra
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switch result {
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case file.Success:
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case file.NoData:
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case file.NameError:
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m.Rcode = dns.RcodeNameError
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case file.Delegation:
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m.Authoritative = false
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case file.ServerFailure:
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return dns.RcodeServerFailure, nil
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}
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state.SizeAndDo(m)
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m, _ = state.Scrub(m)
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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 (a Auto) Name() string { return "auto" }
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