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tailcfg,ipn/ipnlocal: support DNSConfig.Routes with empty values [mapver 23]

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Fixes #2706
Updates #1235

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-08-25 09:07:21 -07:00
committed by Brad Fitzpatrick
parent ac0353e982
commit 88bd796622
2 changed files with 22 additions and 3 deletions
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11
ipn/ipnlocal/local.go
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@@ -1837,6 +1837,17 @@ func (b *LocalBackend) authReconfig() {
if err != nil {
b.logf("[unexpected] non-FQDN route suffix %q", suffix)
}
// Create map entry even if len(resolvers) == 0; Issue 2706.
// This lets the control plane send ExtraRecords for which we
// can authoritatively answer "name not exists" for when the
// control plane also sends this explicit but empty route
// making it as something we handle.
//
// While we're already populating it, might as well size the
// slice appropriately.
dcfg.Routes[fqdn] = make([]netaddr.IPPort, 0, len(resolvers))
for _, resolver := range resolvers {
res, err := parseResolver(resolver)
if err != nil {