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device: add debug logs describing handshake rejection

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Useful in testing when bad network stacks repeat or
batch large numbers of packets.

Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
This commit is contained in:
Avery Pennarun
2020-04-02 15:59:00 +11:00
committed by David Crawshaw
parent 83ca9b47b6
commit d54f0a61aa
1 changed files with 8 additions and 4 deletions
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device/noise-protocol.go
+8 -4
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@@ -315,11 +315,15 @@ func (device *Device) ConsumeMessageInitiation(msg *MessageInitiation) *Peer {
// protect against replay & flood
var ok bool
ok = timestamp.After(handshake.lastTimestamp)
ok = ok && time.Since(handshake.lastInitiationConsumption) > HandshakeInitationRate
replay := !timestamp.After(handshake.lastTimestamp)
flood := time.Since(handshake.lastInitiationConsumption) <= HandshakeInitationRate
handshake.mutex.RUnlock()
if !ok {
if replay {
device.log.Debug.Printf("%v - ConsumeMessageInitiation: handshake replay @ %v\n", peer, timestamp)
return nil
}
if flood {
device.log.Debug.Printf("%v - ConsumeMessageInitiation: handshake flood\n", peer)
return nil
}