sing-box/common/sniff/stun.go

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package sniff
import (
"context"
"encoding/binary"
"os"
"github.com/sagernet/sing-box/adapter"
C "github.com/sagernet/sing-box/constant"
)
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func STUNMessage(_ context.Context, metadata *adapter.InboundContext, packet []byte) error {
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pLen := len(packet)
if pLen < 20 {
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return os.ErrInvalid
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}
if binary.BigEndian.Uint32(packet[4:8]) != 0x2112A442 {
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return os.ErrInvalid
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}
if len(packet) < 20+int(binary.BigEndian.Uint16(packet[2:4])) {
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return os.ErrInvalid
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}
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metadata.Protocol = C.ProtocolSTUN
return nil
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}