mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-23 17:11:29 +00:00
32 lines
684 B
Go
32 lines
684 B
Go
|
package sniff
|
||
|
|
|
||
|
|
import (
|
||
|
|
"context"
|
||
|
|
"os"
|
||
|
|
|
||
|
|
"github.com/sagernet/sing-box/adapter"
|
||
|
|
C "github.com/sagernet/sing-box/constant"
|
||
|
|
)
|
||
|
|
|
||
|
|
func DTLSRecord(ctx context.Context, packet []byte) (*adapter.InboundContext, error) {
|
||
|
|
const fixedHeaderSize = 13
|
||
|
|
if len(packet) < fixedHeaderSize {
|
||
|
|
return nil, os.ErrInvalid
|
||
|
|
}
|
||
|
|
contentType := packet[0]
|
||
|
|
switch contentType {
|
||
|
|
case 20, 21, 22, 23, 25:
|
||
|
|
default:
|
||
|
|
return nil, os.ErrInvalid
|
||
|
|
}
|
||
|
|
versionMajor := packet[1]
|
||
|
|
if versionMajor != 0xfe {
|
||
|
|
return nil, os.ErrInvalid
|
||
|
|
}
|
||
|
|
versionMinor := packet[2]
|
||
|
|
if versionMinor != 0xff && versionMinor != 0xfd {
|
||
|
|
return nil, os.ErrInvalid
|
||
|
|
}
|
||
|
|
return &adapter.InboundContext{Protocol: C.ProtocolDTLS}, nil
|
||
|
|
}
|