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plugin/rewrite: copy msg before rewritting (#4443)

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Copy the msg to prevent messing with the (via the pointer) original
created message that may be stored in the cache or anything other data
store.

Signed-off-by: Miek Gieben <miek@miek.nl>
This commit is contained in:
Miek Gieben 2021-02-01 15:52:50 +01:00 committed by GitHub
parent 117a389e40
commit 03812bb1e7
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 1 deletions
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5
plugin/rewrite/reverter.go
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@ -36,7 +36,10 @@ func NewResponseReverter(w dns.ResponseWriter, r *dns.Msg) *ResponseReverter {
}
// WriteMsg records the status code and calls the underlying ResponseWriter's WriteMsg method.
func (r *ResponseReverter) WriteMsg(res *dns.Msg) error {
func (r *ResponseReverter) WriteMsg(res1 *dns.Msg) error {
// Deep copy 'res' as to not (e.g). rewrite a message that's also stored in the cache.
res := res1.Copy()
res.Question[0] = r.originalQuestion
if r.ResponseRewrite {
for _, rr := range res.Answer {