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Update upstream.Lookup method comment to reflect current state (#4832)

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Signed-off-by: Ondřej Benkovský <ondrej.benkovsky@jamf.com>
This commit is contained in:
Ondřej Benkovský
2021-08-27 05:23:05 -07:00
committed by GitHub
parent 9026a4a295
commit de30710ed3
1 changed files with 3 additions and 1 deletions
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4
plugin/pkg/upstream/upstream.go
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@@ -18,7 +18,9 @@ type Upstream struct{}
// New creates a new Upstream to resolve names using the coredns process.
func New() *Upstream { return &Upstream{} }
// Lookup routes lookups to our selves or forward to a remote.
// Lookup routes lookups to our selves to make it follow the plugin chain *again*, but with a (possibly) new query. As
// we are doing the query against ourselves again, there is no actual new hop, as such RFC 6891 does not apply and we
// need the EDNS0 option present in the *original* query to be present here too.
func (u *Upstream) Lookup(ctx context.Context, state request.Request, name string, typ uint16) (*dns.Msg, error) {
server, ok := ctx.Value(dnsserver.Key{}).(*dnsserver.Server)
if !ok {