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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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4
net/dns/resolver/forwarder.go
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@ -484,13 +484,13 @@ func (f *forwarder) sendDoH(ctx context.Context, urlBase string, c *http.Client,
return res, err
}
var verboseDNSForward = envknob.Bool("TS_DEBUG_DNS_FORWARD_SEND")
var verboseDNSForward = envknob.RegisterBool("TS_DEBUG_DNS_FORWARD_SEND")
// send sends packet to dst. It is best effort.
//
// send expects the reply to have the same txid as txidOut.
func (f *forwarder) send(ctx context.Context, fq *forwardQuery, rr resolverAndDelay) (ret []byte, err error) {
if verboseDNSForward {
if verboseDNSForward() {
f.logf("forwarder.send(%q) ...", rr.name.Addr)
defer func() {
f.logf("forwarder.send(%q) = %v, %v", rr.name.Addr, len(ret), err)