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net/dns/resolver: make hasRDNSBonjourPrefix match shorter queries too

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Fixes tailscale/corp#2886
Updates tailscale/corp#2820
Updates #2442

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-10-13 15:44:20 -07:00
committed by Brad Fitzpatrick
parent a6c3de72d6
commit 676fb458c3
2 changed files with 1 additions and 5 deletions
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5
net/dns/resolver/tsdns.go
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@@ -598,11 +598,6 @@ const (
// dr._dns-sd._udp.<domain>.
// lb._dns-sd._udp.<domain>.
func hasRDNSBonjourPrefix(name dnsname.FQDN) bool {
// Even the shortest name containing a Bonjour prefix is long,
// so check length (cheap) and bail early if possible.
if len(name) < len("*._dns-sd._udp.0.0.0.0.in-addr.arpa.") {
return false
}
s := name.WithTrailingDot()
dot := strings.IndexByte(s, '.')
if dot == -1 {