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chore: Disable cache for RCode client

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This commit is contained in:
H1JK
2023-06-11 20:58:51 +08:00
parent c7de0e0253
commit 54337ecdf3
3 changed files with 19 additions and 10 deletions
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11
dns/util.go
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@@ -287,17 +287,20 @@ func listenPacket(ctx context.Context, proxyAdapter C.ProxyAdapter, proxyName st
return proxyAdapter.ListenPacketContext(ctx, metadata, opts...)
}
func batchExchange(ctx context.Context, clients []dnsClient, m *D.Msg) (msg *D.Msg, err error) {
func batchExchange(ctx context.Context, clients []dnsClient, m *D.Msg) (msg *D.Msg, cache bool, err error) {
fast, ctx := picker.WithTimeout[*D.Msg](ctx, resolver.DefaultDNSTimeout)
domain := msgToDomain(m)
for _, client := range clients {
_, ignoreRCodeError := client.(rcodeClient)
_, cache = client.(rcodeClient)
cache = !cache
fast.Go(func() (*D.Msg, error) {
log.Debugln("[DNS] resolve %s from %s", domain, client.Address())
m, err := client.ExchangeContext(ctx, m)
if err != nil {
return nil, err
} else if !ignoreRCodeError && (m.Rcode == D.RcodeServerFailure || m.Rcode == D.RcodeRefused) {
} else if cache && (m.Rcode == D.RcodeServerFailure || m.Rcode == D.RcodeRefused) {
// currently, cache indicates whether this msg was from a RCode client,
// so we would ignore RCode errors from RCode clients.
return nil, errors.New("server failure")
}
log.Debugln("[DNS] %s --> %s, from %s", domain, msgToIP(m), client.Address())
@@ -311,7 +314,7 @@ func batchExchange(ctx context.Context, clients []dnsClient, m *D.Msg) (msg *D.M
if fErr := fast.Error(); fErr != nil {
err = fmt.Errorf("%w, first error: %s", err, fErr.Error())
}
return nil, err
return nil, true, err
}
msg = elm
return