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request: stop echoing unhandled EDNS options (#8514)

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Signed-off-by: houyuwushang <liuluoqianqiu@outlook.com>
This commit is contained in:
houyuwushang
2026-09-05 09:14:53 +08:00
committed by GitHub
parent 895eab37e8
commit b6987aeb4a
6 changed files with 77 additions and 64 deletions
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9
plugin/pkg/edns/edns.go
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@@ -15,18 +15,15 @@ type supported struct {
sync.RWMutex
}
// SetSupportedOption adds a new supported option the set of EDNS0 options that we support. Plugins typically call
// this in their setup code to signal support for a new option.
// By default we support:
// dns.EDNS0NSID, dns.EDNS0EXPIRE, dns.EDNS0COOKIE, dns.EDNS0TCPKEEPALIVE, dns.EDNS0PADDING. These
// values are not in this map and checked directly in the server.
// SetSupportedOption adds an EDNS0 option to the set of options that CoreDNS may copy from a request to an
// OPT-less response. Plugins typically call this in their setup code to signal support for a custom option.
func SetSupportedOption(option uint16) {
sup.Lock()
sup.m[option] = struct{}{}
sup.Unlock()
}
// SupportedOption returns true if the option code is supported as an extra EDNS0 option.
// SupportedOption returns true if the option code was explicitly registered.
func SupportedOption(option uint16) bool {
sup.RLock()
_, ok := sup.m[option]