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derp: add optional debug logging for prober clients

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This allows tracking packet flow via logs for prober clients. Note that
the new sclient.debug() function is called on every received packet, but
will do nothing for most clients.

I have adjusted sclient logging to print public keys in short format
rather than full. This takes effect even for existing non-debug logging
(mostly client disconnect messages).

Example logs for a packet being sent from client [SbsJn] (connected to
derper [dM2E3]) to client [10WOo] (connected to derper [AVxvv]):

```
derper [dM2E3]:
derp client 10.0.0.1:35470[SbsJn]: register single client mesh("10.0.1.1"): 4 peers
derp client 10.0.0.1:35470[SbsJn]: read frame type 4 len 40 err <nil>
derp client 10.0.0.1:35470[SbsJn]: SendPacket for [10WOo], forwarding via <derphttp_client.Client [AVxvv] url=https://10.0.1.1/derp>: <nil>
derp client 10.0.0.1:35470[SbsJn]: read frame type 0 len 0 err EOF
derp client 10.0.0.1:35470[SbsJn]: read EOF
derp client 10.0.0.1:35470[SbsJn]: sender failed: context canceled
derp client 10.0.0.1:35470[SbsJn]: removing connection

derper [AVxvv]:
derp client 10.0.1.1:50650[10WOo]: register single client
derp client 10.0.1.1:50650[10WOo]: received forwarded packet from [SbsJn] via [dM2E3]
derp client 10.0.1.1:50650[10WOo]: sendPkt attempt 0 enqueued
derp client 10.0.1.1:50650[10WOo]: sendPacket from [SbsJn]: <nil>
derp client 10.0.1.1:50650[10WOo]: read frame type 0 len 0 err EOF
derp client 10.0.1.1:50650[10WOo]: read EOF
derp client 10.0.1.1:50650[10WOo]: sender failed: context canceled
derp client 10.0.1.1:50650[10WOo]: removing connection
```

Signed-off-by: Anton Tolchanov <anton@tailscale.com>
This commit is contained in:
Anton Tolchanov
2023-03-20 15:15:45 +00:00
committed by Anton Tolchanov
parent 50d211d1a4
commit 654b5a0616
3 changed files with 43 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
derp/derp_test.go
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@@ -660,6 +660,9 @@ type testFwd int
func (testFwd) ForwardPacket(key.NodePublic, key.NodePublic, []byte) error {
panic("not called in tests")
}
func (testFwd) String() string {
panic("not called in tests")
}
func pubAll(b byte) (ret key.NodePublic) {
var bs [32]byte
@@ -787,6 +790,7 @@ type channelFwd struct {
c chan []byte
}
func (f channelFwd) String() string { return "" }
func (f channelFwd) ForwardPacket(_ key.NodePublic, _ key.NodePublic, packet []byte) error {
f.c <- packet
return nil