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// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package controlknobs contains client options configurable from control which can be turned on
// or off. The ability to turn options on and off is for incrementally adding features in.
package controlknobs
import (
"os"
"strconv"
"sync/atomic"
"tailscale.com/types/opt"
)
// disableUPnP indicates whether to attempt UPnP mapping.
var disableUPnP atomic.Value
func init() {
v, _ := strconv.ParseBool(os.Getenv("TS_DISABLE_UPNP"))
var toStore opt.Bool
toStore.Set(v)
disableUPnP.Store(toStore)
}
// DisableUPnP reports the last reported value from control
// whether UPnP portmapping should be disabled.
func DisableUPnP() opt.Bool {
v, _ := disableUPnP.Load().(opt.Bool)
return v
}
// SetDisableUPnP will set whether UPnP connections are permitted or not,
// intended to be set from control.
func SetDisableUPnP(v opt.Bool) {
old, ok := disableUPnP.Load().(opt.Bool)
if !ok || old != v {
disableUPnP.Store(v)
}
}
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