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Add IPv6 Reverse DNS Lookup test.

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To be honest I'm not fond of Golden Bytes tests like this, but
not so much as to want to rewrite the whole test. The DNS byte
format is essentially immutable at this point, the encoded bytes
aren't going to change. The rest of the test assumptions about
hostnames might, but we can fix that when it comes.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
This commit is contained in:
Denton Gentry 2021-01-05 13:47:04 -08:00 committed by Denton Gentry
parent 414cb4a695
commit df64b7abf8
1 changed files with 38 additions and 0 deletions
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38
wgengine/tsdns/tsdns_test.go
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@ -593,6 +593,42 @@ var ptrResponse = []byte{
0x05, 0x74, 0x65, 0x73, 0x74, 0x31, 0x03, 0x69, 0x70, 0x6e, 0x03, 0x64, 0x65, 0x76, 0x00,
}
var ptrResponse6 = []byte{
0x00, 0x00, // transaction id: 0
0x84, 0x00, // flags: response, authoritative, no error
0x00, 0x01, // one question
0x00, 0x01, // one answer
0x00, 0x00, 0x00, 0x00, // no authority or additional RRs
// Question: f.0.e.0.d.0.c.0.b.0.a.0.9.0.8.0.7.0.6.0.5.0.4.0.3.0.2.0.1.0.0.0.ip6.arpa
0x01, 0x66, 0x01, 0x30, 0x01, 0x65, 0x01, 0x30,
0x01, 0x64, 0x01, 0x30, 0x01, 0x63, 0x01, 0x30,
0x01, 0x62, 0x01, 0x30, 0x01, 0x61, 0x01, 0x30,
0x01, 0x39, 0x01, 0x30, 0x01, 0x38, 0x01, 0x30,
0x01, 0x37, 0x01, 0x30, 0x01, 0x36, 0x01, 0x30,
0x01, 0x35, 0x01, 0x30, 0x01, 0x34, 0x01, 0x30,
0x01, 0x33, 0x01, 0x30, 0x01, 0x32, 0x01, 0x30,
0x01, 0x31, 0x01, 0x30, 0x01, 0x30, 0x01, 0x30,
0x03, 0x69, 0x70, 0x36,
0x04, 0x61, 0x72, 0x70, 0x61, 0x00,
0x00, 0x0c, 0x00, 0x01, // type PTR, class IN6
// Answer: f.0.e.0.d.0.c.0.b.0.a.0.9.0.8.0.7.0.6.0.5.0.4.0.3.0.2.0.1.0.0.0.ip6.arpa
0x01, 0x66, 0x01, 0x30, 0x01, 0x65, 0x01, 0x30,
0x01, 0x64, 0x01, 0x30, 0x01, 0x63, 0x01, 0x30,
0x01, 0x62, 0x01, 0x30, 0x01, 0x61, 0x01, 0x30,
0x01, 0x39, 0x01, 0x30, 0x01, 0x38, 0x01, 0x30,
0x01, 0x37, 0x01, 0x30, 0x01, 0x36, 0x01, 0x30,
0x01, 0x35, 0x01, 0x30, 0x01, 0x34, 0x01, 0x30,
0x01, 0x33, 0x01, 0x30, 0x01, 0x32, 0x01, 0x30,
0x01, 0x31, 0x01, 0x30, 0x01, 0x30, 0x01, 0x30,
0x03, 0x69, 0x70, 0x36,
0x04, 0x61, 0x72, 0x70, 0x61, 0x00,
0x00, 0x0c, 0x00, 0x01, // type PTR, class IN
0x00, 0x00, 0x02, 0x58, // TTL: 600
0x00, 0x0f, // length: 15 bytes
// PTR: test2.ipn.dev
0x05, 0x74, 0x65, 0x73, 0x74, 0x32, 0x03, 0x69, 0x70, 0x6e, 0x03, 0x64, 0x65, 0x76, 0x00,
}
var nxdomainResponse = []byte{
0x00, 0x00, // transaction id: 0
0x84, 0x03, // flags: response, authoritative, error: nxdomain
@ -636,6 +672,8 @@ func TestFull(t *testing.T) {
{"no-ipv6", dnspacket("test1.ipn.dev.", dns.TypeAAAA), emptyResponse},
{"upper", dnspacket("TEST1.IPN.DEV.", dns.TypeA), ipv4UppercaseResponse},
{"ptr", dnspacket("4.3.2.1.in-addr.arpa.", dns.TypePTR), ptrResponse},
{"ptr", dnspacket("f.0.e.0.d.0.c.0.b.0.a.0.9.0.8.0.7.0.6.0.5.0.4.0.3.0.2.0.1.0.0.0.ip6.arpa.",
dns.TypePTR), ptrResponse6},
{"nxdomain", dnspacket("test3.ipn.dev.", dns.TypeA), nxdomainResponse},
}