mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-17 00:53:47 +08:00
33 lines
656 B
Go
33 lines
656 B
Go
package sniff
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import (
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"context"
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"os"
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"github.com/sagernet/sing-box/adapter"
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C "github.com/sagernet/sing-box/constant"
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)
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func DTLSRecord(ctx context.Context, metadata *adapter.InboundContext, packet []byte) error {
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const fixedHeaderSize = 13
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if len(packet) < fixedHeaderSize {
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return os.ErrInvalid
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}
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contentType := packet[0]
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switch contentType {
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case 20, 21, 22, 23, 25:
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default:
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return os.ErrInvalid
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}
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versionMajor := packet[1]
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if versionMajor != 0xfe {
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return os.ErrInvalid
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}
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versionMinor := packet[2]
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if versionMinor != 0xff && versionMinor != 0xfd {
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return os.ErrInvalid
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}
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metadata.Protocol = C.ProtocolDTLS
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return nil
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}
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