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wgengine/magicsock: add debug envvar to force all traffic over DERP

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This would have been useful during debugging DERP issues recently.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder 2021-07-13 16:01:37 -07:00 committed by Josh Bleecher Snyder
parent e41193ec4d
commit c179580599
1 changed files with 8 additions and 0 deletions
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8
wgengine/magicsock/magicsock.go
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@ -83,6 +83,8 @@
// 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"))
)
// useDerpRoute reports whether magicsock should enable the DERP
@ -2665,6 +2667,12 @@ func (c *Conn) bindSocket(rucPtr **RebindingUDPConn, network string, curPortFate
ruc.mu.Lock()
defer ruc.mu.Unlock()
if debugAlwaysDERP {
c.logf("disabled %v per TS_DEBUG_ALWAYS_USE_DERP", network)
ruc.pconn = newBlockForeverConn()
return nil
}
// Build a list of preferred ports.
// Best is the port that the user requested.
// Second best is the port that is currently in use.