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dns proxy: port DNS64 synthesis to master

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Port the reviewed DNS64 behavior while preserving master's context-aware
resolver, cache, logging, and Firewall Mode flow.
This commit is contained in:
Dev Scribe
2026-09-03 13:58:24 +07:00
committed by Cuong Manh Le
parent d8994cc7d8
commit dd77d865b6
6 changed files with 979 additions and 34 deletions
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cmd/cli/dns_proxy_test.go
+46
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@@ -286,6 +286,52 @@ func TestCache(t *testing.T) {
assert.Equal(t, answer2.Rcode, got2.answer.Rcode)
}
func TestDNS64CacheLookup(t *testing.T) {
cfg := testhelper.SampleConfig(t)
p := &prog{cfg: cfg}
cache, err := dnscache.NewLRUCache(16)
require.NoError(t, err)
p.cache = cache
now := time.Now()
prefix := dns64WellKnownPrefix
req := mkAAAAReq("legacy.example")
upstream := "upstream.0"
empty := new(dns.Msg)
empty.SetReply(req)
synthesized := new(dns.Msg)
synthesized.SetReply(req)
synthesized.Answer = []dns.RR{&dns.AAAA{Hdr: dns.RR_Header{Name: req.Question[0].Name, Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: 60}, AAAA: net.ParseIP("64:ff9b::c000:201")}}
t.Run("fresh variant hit", func(t *testing.T) {
p.cache.Purge()
p.cache.Add(dns64CacheKey(req, upstream, prefix), dnscache.NewValue(synthesized, now.Add(time.Minute)))
answer, stale, hit, dns64Hit, bypass := p.cachedResponse(req, upstream, prefix, true, now)
if answer == nil || !answerHasAAAA(answer) || stale != nil || !hit || !dns64Hit || bypass {
t.Fatalf("unexpected lookup result: answer=%v stale=%v hit=%v dns64Hit=%v bypass=%v", answer, stale, hit, dns64Hit, bypass)
}
})
t.Run("fresh empty normal answer is retained as stale while bypassed", func(t *testing.T) {
p.cache.Purge()
p.cache.Add(dnscache.NewKey(req, upstream), dnscache.NewValue(empty, now.Add(time.Minute)))
answer, stale, hit, dns64Hit, bypass := p.cachedResponse(req, upstream, prefix, true, now)
if answer != nil || stale == nil || hit || dns64Hit || !bypass {
t.Fatalf("unexpected lookup result: answer=%v stale=%v hit=%v dns64Hit=%v bypass=%v", answer, stale, hit, dns64Hit, bypass)
}
})
t.Run("expired variant is preferred as stale", func(t *testing.T) {
p.cache.Purge()
p.cache.Add(dns64CacheKey(req, upstream, prefix), dnscache.NewValue(synthesized, now.Add(-time.Minute)))
p.cache.Add(dnscache.NewKey(req, upstream), dnscache.NewValue(empty, now.Add(-time.Minute)))
answer, stale, hit, dns64Hit, bypass := p.cachedResponse(req, upstream, prefix, true, now)
if answer != nil || stale == nil || !answerHasAAAA(stale) || hit || dns64Hit || bypass {
t.Fatalf("unexpected lookup result: answer=%v stale=%v hit=%v dns64Hit=%v bypass=%v", answer, stale, hit, dns64Hit, bypass)
}
})
}
func Test_ipAndMacFromMsg(t *testing.T) {
tests := []struct {
name string