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wgengine/magicsock: check STUN regularly

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This commit is contained in:
Brad Fitzpatrick 2020-03-02 12:37:52 -08:00
parent 7172f3dbf4
commit 4675c70464
1 changed files with 12 additions and 0 deletions
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12
wgengine/magicsock/magicsock.go
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@ -31,6 +31,7 @@
"tailscale.com/stun"
"tailscale.com/stunner"
"tailscale.com/types/key"
"tailscale.com/version"
)
// A Conn routes UDP packets and actively manages a list of its endpoints.
@ -171,6 +172,16 @@ func (c *Conn) epUpdate(ctx context.Context) {
var lastEndpoints []string
var lastCancel func()
var lastDone chan struct{}
var regularUpdate <-chan time.Time
if !version.IsMobile() {
// We assume that LinkChange notifications are plumbed through well
// on our mobile clients, so don't do the timer thing to save radio/battery/CPU/etc.
ticker := time.NewTicker(28 * time.Second) // just under 30s, a likely UDP NAT timeout
defer ticker.Stop()
regularUpdate = ticker.C
}
for {
select {
case <-ctx.Done():
@ -179,6 +190,7 @@ func (c *Conn) epUpdate(ctx context.Context) {
}
return
case <-c.startEpUpdate:
case <-regularUpdate:
}
if lastCancel != nil {