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net/dns/resolver: return an empty successful response instead of NXDomain when resolving A records for 4via6 domains

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As quad-100 is an authoritative server for 4via6 domains, it should always return responses
with a response code of 0 (indicating no error) when resolving records for these domains.
If there's no resource record of the specified type (e.g. A), it should return a response
with an empty answer section rather than NXDomain. Such a response indicates that there
is at least one RR of a different type (e.g., AAAA), suggesting the Windows stub resolver
to look for it.

Fixes tailscale/corp#20767

Signed-off-by: Nick Khyl <nickk@tailscale.com>
This commit is contained in:
Nick Khyl
2024-06-10 18:34:20 -05:00
committed by Nick Khyl
parent 4b6a0c42c8
commit 4cdc4ed7db
2 changed files with 28 additions and 4 deletions
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net/dns/resolver/tsdns_test.go
+6
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@@ -401,6 +401,12 @@ func TestResolveLocal(t *testing.T) {
// suffixes are currently hard-coded and not plumbed via the netmap)
{"via_form3_dec_example.com", dnsname.FQDN("1-2-3-4-via-1.example.com."), dns.TypeAAAA, netip.Addr{}, dns.RCodeRefused},
{"via_form3_dec_examplets.net", dnsname.FQDN("1-2-3-4-via-1.examplets.net."), dns.TypeAAAA, netip.Addr{}, dns.RCodeRefused},
// Resolve A and ALL types of resource records.
{"via_type_a", dnsname.FQDN("1-2-3-4-via-1."), dns.TypeA, netip.Addr{}, dns.RCodeSuccess},
{"via_invalid_type_a", dnsname.FQDN("1-2-3-4-via-."), dns.TypeA, netip.Addr{}, dns.RCodeRefused},
{"via_type_all", dnsname.FQDN("1-2-3-4-via-1."), dns.TypeALL, netip.MustParseAddr("fd7a:115c:a1e0:b1a:0:1:1.2.3.4"), dns.RCodeSuccess},
{"via_invalid_type_all", dnsname.FQDN("1-2-3-4-via-."), dns.TypeALL, netip.Addr{}, dns.RCodeRefused},
}
for _, tt := range tests {