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Treat requests with OPT extra but no options as simple requests

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世界 2025-09-05 16:23:30 +08:00
parent c6396b8a59
commit d8191a1ee6
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1 changed files with 7 additions and 2 deletions
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9
dns/client.go
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@ -19,7 +19,7 @@ import (
"github.com/sagernet/sing/contrab/freelru"
"github.com/sagernet/sing/contrab/maphash"
dns "github.com/miekg/dns"
"github.com/miekg/dns"
)
var (
@ -116,9 +116,14 @@ func (c *Client) Exchange(ctx context.Context, transport adapter.DNSTransport, m
if clientSubnet.IsValid() {
message = SetClientSubnet(message, clientSubnet)
}
isSimpleRequest := len(message.Question) == 1 &&
len(message.Ns) == 0 &&
len(message.Extra) == 0 &&
(len(message.Extra) == 0 || len(message.Extra) == 1 &&
message.Extra[0].Header().Rrtype == dns.TypeOPT &&
message.Extra[0].Header().Class > 0 &&
message.Extra[0].Header().Ttl == 0 &&
len(message.Extra[0].(*dns.OPT).Option) == 0) &&
!options.ClientSubnet.IsValid()
disableCache := !isSimpleRequest || c.disableCache || options.DisableCache
if !disableCache {