sing-box/common/sniff/stun.go
2022-07-16 12:01:02 +08:00

25 lines
552 B
Go

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