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envknob: support changing envknobs post-init

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Updates #5114

Change-Id: Ia423fc7486e1b3f3180a26308278be0086fae49b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-09-14 12:49:39 -07:00
committed by Brad Fitzpatrick
parent 33ee2c058e
commit 74674b110d
31 changed files with 311 additions and 167 deletions
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14
wgengine/magicsock/debugknobs.go
View File

@ -11,28 +11,30 @@ import (
"tailscale.com/envknob"
)
const linkDebug = true
// Various debugging and experimental tweakables, set by environment
// variable.
var (
// debugDisco prints verbose logs of active discovery events as
// they happen.
debugDisco = envknob.Bool("TS_DEBUG_DISCO")
debugDisco = envknob.RegisterBool("TS_DEBUG_DISCO")
// debugOmitLocalAddresses removes all local interface addresses
// from magicsock's discovered local endpoints. Used in some tests.
debugOmitLocalAddresses = envknob.Bool("TS_DEBUG_OMIT_LOCAL_ADDRS")
debugOmitLocalAddresses = envknob.RegisterBool("TS_DEBUG_OMIT_LOCAL_ADDRS")
// debugUseDerpRoute temporarily (2020-03-22) controls whether DERP
// reverse routing is enabled (Issue 150).
debugUseDerpRoute = envknob.OptBool("TS_DEBUG_ENABLE_DERP_ROUTE")
debugUseDerpRoute = envknob.RegisterOptBool("TS_DEBUG_ENABLE_DERP_ROUTE")
// logDerpVerbose logs all received DERP packets, including their
// full payload.
logDerpVerbose = envknob.Bool("TS_DEBUG_DERP")
logDerpVerbose = envknob.RegisterBool("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 = envknob.Bool("TS_DEBUG_RESTUN_STOP_ON_IDLE")
debugReSTUNStopOnIdle = envknob.RegisterBool("TS_DEBUG_RESTUN_STOP_ON_IDLE")
// debugAlwaysDERP disables the use of UDP, forcing all peer communication over DERP.
debugAlwaysDERP = envknob.Bool("TS_DEBUG_ALWAYS_USE_DERP")
debugAlwaysDERP = envknob.RegisterBool("TS_DEBUG_ALWAYS_USE_DERP")
)
// inTest reports whether the running program is a test that set the