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core: edns0 tweaks (#2385)

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* core: edns0 tweaks

Per comment thread in https://github.com/coredns/coredns/pull/2357 which
spotted a bug; updated the code and added some comments.

This function should probably be redone as some point or made obsolete.

Signed-off-by: Miek Gieben <miek@miek.nl>

* Remove setting options when m is EDNS0 record

Assume upstream set them correctly or a plugin.

Signed-off-by: Miek Gieben <miek@miek.nl>
This commit is contained in:
Miek Gieben 2018-12-10 19:43:46 +00:00 • committed by GitHub
parent 9abbf4a4a0
commit fed307bfce
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 10 deletions
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14
request/request.go
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@ -192,15 +192,13 @@ func (r *Request) Size() int {
}
// SizeAndDo adds an OPT record that the reflects the intent from request.
// The returned bool indicated if an record was found and normalised.
// The returned bool indicates if an record was found and normalised.
func (r *Request) SizeAndDo(m *dns.Msg) bool {
o := r.Req.IsEdns0()
if o == nil {
return false
}
odo := o.Do()
if mo := m.IsEdns0(); mo != nil {
mo.Hdr.Name = "."
mo.Hdr.Rrtype = dns.TypeOPT
@ -208,16 +206,15 @@ func (r *Request) SizeAndDo(m *dns.Msg) bool {
mo.SetUDPSize(o.UDPSize())
mo.Hdr.Ttl &= 0xff00 // clear flags
if len(o.Option) > 0 {
o.Option = supportedOptions(o.Option)
}
// Assume if the message m has options set, they are OK and represent what an upstream can do.
if odo {
if o.Do() {
mo.SetDo()
}
return true
}
// Reuse the request's OPT record and tack it to m.
o.Hdr.Name = "."
o.Hdr.Rrtype = dns.TypeOPT
o.SetVersion(0)
@ -227,9 +224,6 @@ func (r *Request) SizeAndDo(m *dns.Msg) bool {
o.Option = supportedOptions(o.Option)
}
if odo {
o.SetDo()
}
m.Extra = append(m.Extra, o)
return true
}