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add wildcard warnings (#5030)

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Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
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Chris O'Haver 2021-12-09 11:24:48 -05:00 • committed by GitHub
parent e5ea3341fa
commit 744468ea78
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3 changed files with 33 additions and 0 deletions
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11
plugin/kubernetes/handler.go
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@ -2,6 +2,8 @@ package kubernetes
import (
"context"
"strings"
"sync/atomic"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/request"
@ -27,6 +29,10 @@ func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.M
err error
)
if wildQuestion(state.Name()) {
atomic.AddUint64(&wildCount, 1)
}
switch state.QType() {
case dns.TypeA:
records, err = plugin.A(ctx, &k, zone, state, nil, plugin.Options{})
@ -85,8 +91,13 @@ func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.M
m.Answer = append(m.Answer, records...)
m.Extra = append(m.Extra, extra...)
w.WriteMsg(m)
return dns.RcodeSuccess, nil
}
func wildQuestion(name string) bool {
return strings.HasPrefix(name, "*.") || strings.HasPrefix(name, "any.") || strings.Contains(name, ".*.") || strings.Contains(name, ".any.")
}
// Name implements the Handler interface.
func (k Kubernetes) Name() string { return "kubernetes" }