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prober: log client pubkeys on derp mesh probe failures 

Updates https://github.com/tailscale/corp/issues/9916

Signed-off-by: Anton Tolchanov <anton@tailscale.com>
This commit is contained in:
Anton Tolchanov 2023-03-20 15:12:48 +00:00 committed by Anton Tolchanov
parent 60a028a4f6
commit e59dc29a55
1 changed files with 11 additions and 0 deletions
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11
prober/derp.go
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@ -273,6 +273,17 @@ func derpProbeNodePair(ctx context.Context, dm *tailcfg.DERPMap, from, to *tailc
time.Sleep(100 * time.Millisecond) // pretty arbitrary
}
latency, err = runDerpProbeNodePair(ctx, from, to, fromc, toc)
if err != nil {
// Record pubkeys on failed probes to aid investigation.
err = fmt.Errorf("%s -> %s: %w",
fromc.SelfPublicKey().ShortString(),
toc.SelfPublicKey().ShortString(), err)
}
return latency, err
}
func runDerpProbeNodePair(ctx context.Context, from, to *tailcfg.DERPNode, fromc, toc *derphttp.Client) (latency time.Duration, err error) {
// Make a random packet
pkt := make([]byte, 8)
crand.Read(pkt)