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Anton Tolchanov 654b5a0616 derp: add optional debug logging for prober clients ... 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>		3 years ago
..
derphttp	derp: add optional debug logging for prober clients	3 years ago
testdata	derp: add debug traffic handler	5 years ago
derp.go	all: update copyright and license headers	3 years ago
derp_client.go	all: update copyright and license headers	3 years ago
derp_server.go	derp: add optional debug logging for prober clients	3 years ago
derp_server_default.go	all: update copyright and license headers	3 years ago
derp_server_linux.go	all: update copyright and license headers	3 years ago
derp_test.go	derp: add optional debug logging for prober clients	3 years ago
dropreason_string.go	all: update copyright and license headers	3 years ago