package dispatcher import ( "context" "strings" "github.com/xtls/xray-core/common" "github.com/xtls/xray-core/common/net" "github.com/xtls/xray-core/common/session" "github.com/xtls/xray-core/core" "github.com/xtls/xray-core/features/dns" ) // newFakeDNSSniffer Creates a Fake DNS metadata sniffer func newFakeDNSSniffer(ctx context.Context) (protocolSnifferWithMetadata, error) { var fakeDNSEngine dns.FakeDNSEngine { fakeDNSEngineFeat := core.MustFromContext(ctx).GetFeature((*dns.FakeDNSEngine)(nil)) if fakeDNSEngineFeat != nil { fakeDNSEngine = fakeDNSEngineFeat.(dns.FakeDNSEngine) } } if fakeDNSEngine == nil { errNotInit := newError("FakeDNSEngine is not initialized, but such a sniffer is used").AtError() return protocolSnifferWithMetadata{}, errNotInit } return protocolSnifferWithMetadata{protocolSniffer: func(ctx context.Context, bytes []byte) (SniffResult, error) { Target := session.OutboundFromContext(ctx).Target if Target.Network == net.Network_TCP || Target.Network == net.Network_UDP { domainFromFakeDNS := fakeDNSEngine.GetDomainFromFakeDNS(Target.Address) if domainFromFakeDNS != "" { newError("fake dns got domain: ", domainFromFakeDNS, " for ip: ", Target.Address.String()).WriteToLog(session.ExportIDToError(ctx)) return &fakeDNSSniffResult{domainName: domainFromFakeDNS}, nil } } if ipAddressInRangeValueI := ctx.Value(ipAddressInRange); ipAddressInRangeValueI != nil { ipAddressInRangeValue := ipAddressInRangeValueI.(*ipAddressInRangeOpt) if fkr0, ok := fakeDNSEngine.(dns.FakeDNSEngineRev0); ok { inPool := fkr0.IsIPInIPPool(Target.Address) ipAddressInRangeValue.addressInRange = &inPool } } return nil, common.ErrNoClue }, metadataSniffer: true}, nil } type fakeDNSSniffResult struct { domainName string } func (fakeDNSSniffResult) Protocol() string { return "fakedns" } func (f fakeDNSSniffResult) Domain() string { return f.domainName } type fakeDNSExtraOpts int const ipAddressInRange fakeDNSExtraOpts = 1 type ipAddressInRangeOpt struct { addressInRange *bool } type DNSThenOthersSniffResult struct { domainName string protocolOriginalName string } func (f DNSThenOthersSniffResult) IsProtoSubsetOf(protocolName string) bool { return strings.HasPrefix(protocolName, f.protocolOriginalName) } func (DNSThenOthersSniffResult) Protocol() string { return "fakedns+others" } func (f DNSThenOthersSniffResult) Domain() string { return f.domainName } func newFakeDNSThenOthers(ctx context.Context, fakeDNSSniffer protocolSnifferWithMetadata, others []protocolSnifferWithMetadata) ( protocolSnifferWithMetadata, error, ) { // nolint: unparam // ctx may be used in the future _ = ctx return protocolSnifferWithMetadata{ protocolSniffer: func(ctx context.Context, bytes []byte) (SniffResult, error) { ipAddressInRangeValue := &ipAddressInRangeOpt{} ctx = context.WithValue(ctx, ipAddressInRange, ipAddressInRangeValue) result, err := fakeDNSSniffer.protocolSniffer(ctx, bytes) if err == nil { return result, nil } if ipAddressInRangeValue.addressInRange != nil { if *ipAddressInRangeValue.addressInRange { for _, v := range others { if v.metadataSniffer || bytes != nil { if result, err := v.protocolSniffer(ctx, bytes); err == nil { return DNSThenOthersSniffResult{domainName: result.Domain(), protocolOriginalName: result.Protocol()}, nil } } } return nil, common.ErrNoClue } newError("ip address not in fake dns range, return as is").AtDebug().WriteToLog() return nil, common.ErrNoClue } newError("fake dns sniffer did not set address in range option, assume false.").AtWarning().WriteToLog() return nil, common.ErrNoClue }, metadataSniffer: false, }, nil }