1 files changed, 0 insertions, 83 deletions
diff --git a/plugin/etcd/stub_handler.go b/plugin/etcd/stub_handler.go
deleted file mode 100644
index 1282a8263..000000000
--- a/plugin/etcd/stub_handler.go
+++ /dev/null
@@ -1,83 +0,0 @@
-package etcd
-
-import (
-	"context"
-	"errors"
-
-	"github.com/coredns/coredns/request"
-
-	"github.com/miekg/dns"
-)
-
-// Stub wraps an Etcd. We have this type so that it can have a ServeDNS method.
-type Stub struct {
-	*Etcd
-	Zone string // for what zone (and thus what nameservers are we called)
-}
-
-// ServeDNS implements the plugin.Handler interface.
-func (s Stub) ServeDNS(ctx context.Context, w dns.ResponseWriter, req *dns.Msg) (int, error) {
-	if hasStubEdns0(req) {
-		log.Warningf("Forwarding cycle detected, refusing msg: %s", req.Question[0].Name)
-		return dns.RcodeRefused, errors.New("stub forward cycle")
-	}
-	req = addStubEdns0(req)
-	proxy, ok := (*s.Etcd.Stubmap)[s.Zone]
-	if !ok { // somebody made a mistake..
-		return dns.RcodeServerFailure, nil
-	}
-
-	state := request.Request{W: w, Req: req}
-	m, e := proxy.Forward(state)
-	if e != nil {
-		return dns.RcodeServerFailure, e
-	}
-	w.WriteMsg(m)
-	return dns.RcodeSuccess, nil
-}
-
-// hasStubEdns0 checks if the message is carrying our special edns0 zero option.
-func hasStubEdns0(m *dns.Msg) bool {
-	option := m.IsEdns0()
-	if option == nil {
-		return false
-	}
-	for _, o := range option.Option {
-		if o.Option() == ednsStubCode && len(o.(*dns.EDNS0_LOCAL).Data) == 1 &&
-			o.(*dns.EDNS0_LOCAL).Data[0] == 1 {
-			return true
-		}
-	}
-	return false
-}
-
-// addStubEdns0 adds our special option to the message's OPT record.
-func addStubEdns0(m *dns.Msg) *dns.Msg {
-	option := m.IsEdns0()
-	// Add a custom EDNS0 option to the packet, so we can detect loops when 2 stubs are forwarding to each other.
-	if option != nil {
-		option.Option = append(option.Option, &dns.EDNS0_LOCAL{Code: ednsStubCode, Data: []byte{1}})
-		return m
-	}
-
-	m.Extra = append(m.Extra, ednsStub)
-	return m
-}
-
-const (
-	ednsStubCode = dns.EDNS0LOCALSTART + 10
-	stubDomain   = "stub.dns"
-)
-
-var ednsStub = func() *dns.OPT {
-	o := new(dns.OPT)
-	o.Hdr.Name = "."
-	o.Hdr.Rrtype = dns.TypeOPT
-	o.SetUDPSize(4096)
-
-	e := new(dns.EDNS0_LOCAL)
-	e.Code = ednsStubCode
-	e.Data = []byte{1}
-	o.Option = append(o.Option, e)
-	return o
-}()