tailscale/wgengine/magicsock/debugknobs.go

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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.
//go:build !ios
// +build !ios
package magicsock
import (
"os"
"strconv"
)
// Various debugging and experimental tweakables, set by environment
// variable.
var (
// debugDisco prints verbose logs of active discovery events as
// they happen.
debugDisco, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_DISCO"))
// debugOmitLocalAddresses removes all local interface addresses
// from magicsock's discovered local endpoints. Used in some tests.
debugOmitLocalAddresses, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_OMIT_LOCAL_ADDRS"))
// debugUseDerpRoute temporarily (2020-03-22) controls whether DERP
// reverse routing is enabled (Issue 150). It will become always true
// later.
debugUseDerpRouteEnv = os.Getenv("TS_DEBUG_ENABLE_DERP_ROUTE")
debugUseDerpRoute, _ = strconv.ParseBool(debugUseDerpRouteEnv)
// logDerpVerbose logs all received DERP packets, including their
// full payload.
logDerpVerbose, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_DERP"))
// debugReSTUNStopOnIdle unconditionally enables the "shut down
// STUN if magicsock is idle" behavior that normally only triggers
// on mobile devices, lowers the shutdown interval, and logs more
// verbosely about idle measurements.
debugReSTUNStopOnIdle, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_RESTUN_STOP_ON_IDLE"))
// debugAlwaysDERP disables the use of UDP, forcing all peer communication over DERP.
debugAlwaysDERP, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_ALWAYS_USE_DERP"))
)
// inTest reports whether the running program is a test that set the
// IN_TS_TEST environment variable.
//
// Unlike the other debug tweakables above, this one needs to be
// checked every time at runtime, because tests set this after program
// startup.
func inTest() bool {
inTest, _ := strconv.ParseBool(os.Getenv("IN_TS_TEST"))
return inTest
}