diff options
Diffstat (limited to 'plugin/pkg')
| -rw-r--r-- | plugin/pkg/edns/edns.go | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/plugin/pkg/edns/edns.go b/plugin/pkg/edns/edns.go index 3f0ea5e16..e99fdfb0a 100644 --- a/plugin/pkg/edns/edns.go +++ b/plugin/pkg/edns/edns.go @@ -3,10 +3,37 @@ package edns import ( "errors" + "sync" "github.com/miekg/dns" ) +var sup = &supported{m: make(map[uint16]struct{})} + +type supported struct { + m map[uint16]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. +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. +func SupportedOption(option uint16) bool { + sup.RLock() + _, ok := sup.m[option] + sup.RUnlock() + return ok +} + // Version checks the EDNS version in the request. If error // is nil everything is OK and we can invoke the plugin. If non-nil, the // returned Msg is valid to be returned to the client (and should). For some |