mirror of
https://github.com/XTLS/Xray-core.git
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52 lines
1.6 KiB
Go
52 lines
1.6 KiB
Go
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// +build !confonly
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package dispatcher
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import (
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"context"
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"github.com/xtls/xray-core/core"
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"github.com/xtls/xray-core/common"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/session"
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"github.com/xtls/xray-core/features/dns"
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)
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// newFakeDNSSniffer Create a Fake DNS metadata sniffer
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func newFakeDNSSniffer(ctx context.Context) (protocolSnifferWithMetadata, error) {
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var fakeDNSEngine dns.FakeDNSEngine
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err := core.RequireFeatures(ctx, func(fdns dns.FakeDNSEngine) {
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fakeDNSEngine = fdns
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})
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if err != nil {
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return protocolSnifferWithMetadata{}, err
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}
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if fakeDNSEngine == nil {
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errNotInit := newError("FakeDNSEngine is not initialized, but such a sniffer is used").AtError()
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return protocolSnifferWithMetadata{}, errNotInit
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}
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return protocolSnifferWithMetadata{protocolSniffer: func(ctx context.Context, bytes []byte) (SniffResult, error) {
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Target := session.OutboundFromContext(ctx).Target
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if Target.Network == net.Network_TCP || Target.Network == net.Network_UDP {
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domainFromFakeDNS := fakeDNSEngine.GetDomainFromFakeDNS(Target.Address)
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if domainFromFakeDNS != "" {
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newError("fake dns got domain: ", domainFromFakeDNS, " for ip: ", Target.Address.String()).WriteToLog(session.ExportIDToError(ctx))
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return &fakeDNSSniffResult{domainName: domainFromFakeDNS}, nil
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}
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}
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return nil, common.ErrNoClue
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}, metadataSniffer: true}, nil
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}
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type fakeDNSSniffResult struct {
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domainName string
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}
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func (fakeDNSSniffResult) Protocol() string {
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return "fakedns"
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}
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func (f fakeDNSSniffResult) Domain() string {
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return f.domainName
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}
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