为了更好的调试，准备重构

Signed-off-by: dmy@lab <dmy@lab.com>

cli/cli.go

@@ -8,10 +8,12 @@ var DestIP string
 var DestPort int
 var ListenPort int
 var EncryptSide string
+var LogTo string
 
 func init() {
 	flag.StringVar(&DestIP, "destip", "", "Destination IP")
 	flag.StringVar(&EncryptSide, "encrypt", "", "Encrypt Side")
+	flag.StringVar(&LogTo, "log", "stdout", "Log to where")
 	flag.IntVar(&DestPort, "destport", 0, "Destination Port")
 	flag.IntVar(&ListenPort, "listenport", 0, "Listen Port")
 }