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cmd/natc: add an explicit error for missing peer state

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Updates tailscale/corp#26968

Signed-off-by: James Tucker <james@tailscale.com>
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James Tucker 2025-03-10 10:04:19 -07:00
parent 5f515a3731
commit b267bc5e79
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1 changed files with 5 additions and 1 deletions
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6
cmd/natc/natc.go
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@ -347,7 +347,11 @@ var tsMBox = dnsmessage.MustNewName("support.tailscale.com.")
// generateDNSResponse generates a DNS response for the given request. The from // generateDNSResponse generates a DNS response for the given request. The from
// argument is the NodeID of the node that sent the request. // argument is the NodeID of the node that sent the request.
func (c *connector) generateDNSResponse(req *dnsmessage.Message, from tailcfg.NodeID) ([]byte, error) { func (c *connector) generateDNSResponse(req *dnsmessage.Message, from tailcfg.NodeID) ([]byte, error) {
pm, _ := c.perPeerMap.LoadOrStore(from, &perPeerState{c: c}) pm, ok := c.perPeerMap.LoadOrStore(from, &perPeerState{c: c})
if !ok {
// TODO(raggi): consider returning NXDOMAIN, but it is likely this result does not want to be cached.
return nil, fmt.Errorf("missing peer state for %s, unable to answer query: %v", from, req)
}
var addrs []netip.Addr var addrs []netip.Addr
if len(req.Questions) > 0 { if len(req.Questions) > 0 {
switch req.Questions[0].Type { switch req.Questions[0].Type {