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261 Commits

Author SHA1 Message Date
Brad Fitzpatrick
614eec174f derp/derphttp: avoid endless reconnect race on failure 
Originally from @stablebits (Dmitry Adamushko) in:
https://github.com/tailscale/tailscale/pull/264
 2020-04-11 13:37:20 -07:00
Dmitry Adamushko
806645ea0e derp: prevent readFrame() from reading more than len(b) bytes. 
Signed-off-by: Dmitry Adamushko <da@stablebits.net>
 2020-04-10 08:56:23 -07:00
Dmitry Adamushko
f2c2d0de68 derp/derp_server: unregisterClient() for replaced client connections. 
When unregistering a replaced client connection, move the
still-connected peers to the current client connecition. Inform
the peers that we've gone only when unregistering the active
client connection.

Signed-off-by: Dmitry Adamushko <da@stablebits.net>
 2020-04-10 08:52:30 -07:00
Dmitry Adamushko
44434fdc82 derp/derp_server: fixed unbalanced {register,unregister}Client() calls. 
Signed-off-by: Dmitry Adamushko <da@stablebits.net>
 2020-04-06 15:13:47 -07:00
David Anderson
4e0ee141e8 derp/derpmap: add derp5 (Sydney) to prod map. 
Signed-off-by: David Anderson <dave@natulte.net>
 2020-04-05 18:55:29 -07:00
Brad Fitzpatrick
1df3c8d02a derp, netcheck: make tests listen on localhost only 
avoid macOS firewall pop-ups
 2020-03-30 11:29:08 -07:00
Brad Fitzpatrick
e749377a56 derp/derphttp: remove a redundant log message 2020-03-23 21:23:36 -07:00
Brad Fitzpatrick
1d3f45f9be derp/derphttp: ignore PeerGoneMessage in test 2020-03-23 14:13:49 -07:00
Brad Fitzpatrick
1ab5b31c4b derp, magicsock: send new "peer gone" frames when previous sender disconnects 
Updates #150 (not yet enabled by default in magicsock)

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-22 21:00:47 -07:00
Brad Fitzpatrick
8c4cef60f8 derp: wait for send goroutine to finish before returning from run 
I saw a test flake due to the sender goroutine logging (ultimately to
t.Logf) after the server was closed.

This makes sure the all goroutines are cleaned up before Server.Close
returns.
 2020-03-22 13:10:07 -07:00
Brad Fitzpatrick
521ad7b0fc derp: only flush writes to clients when we're out of things to write 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-22 08:01:25 -07:00
Brad Fitzpatrick
0a25abcdaa derp: remove TODO comment 
It was done in bf704a5218
 2020-03-22 07:54:50 -07:00
Brad Fitzpatrick
8519a1b29f derp: revert rename of pkt to sendMsg 
New plan, sorry.

Most reverts 77921a31b1, except some doc changes.
 2020-03-21 22:17:22 -07:00
Brad Fitzpatrick
c34b350efa derp: remove the mutex around and closing of send channel 
Makes it less complicated.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-21 22:00:04 -07:00
Brad Fitzpatrick
77921a31b1 derp: rename pkt to sendMsg, in prep for other types of writes 
Updates #150
 2020-03-21 20:34:49 -07:00
Brad Fitzpatrick
1453aecb44 derp: add sclient.done channel, simplify some context passing 
This is mostly prep for a few future CLs, making sure we always have a
close-on-dead done channel available to select on when doing other
channel operations.
 2020-03-21 18:28:34 -07:00
David Anderson
ea90780066 derp: specify type of the by-reason drop varz. 
Signed-off-by: David Anderson <dave@natulte.net>
 2020-03-20 15:53:04 -07:00
Brad Fitzpatrick
fd824df1fa derp: export metric for server's initial MemStats.Sys reading 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-20 15:37:36 -07:00
David Anderson
64b5248929 derp: sprinkle comments and docstrings. 
Signed-off-by: David Anderson <dave@natulte.net>
 2020-03-20 15:14:01 -07:00
David Anderson
58b8ebd290 derp: add per-reason packet drop counter. 
In parallel with the summed counter for now, for dashboard migration.

Signed-off-by: David Anderson <dave@natulte.net>
 2020-03-20 15:14:01 -07:00
David Anderson
1e031001db derp: move write timeout to package constant. 
Signed-off-by: David Anderson <dave@natulte.net>
 2020-03-20 15:14:01 -07:00
David Anderson
dbfc916273 derp: add short queues between reader and writer, drop on overload. 
This avoids the server blocking on misbehaving or heavily contended
clients. We attempt to drop from the head of the queue to keep
overall queueing time lower.

Also:
 - fixes server->client keepalives, which weren't happening.
 - removes read rate-limiter, deferring instead to kernel-level
   global limiter/fair queuer.

Signed-off-by: David Anderson <dave@natulte.net>
 2020-03-20 15:14:01 -07:00
David Crawshaw
131541c06d derp: deflake test 
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
 2020-03-18 16:33:25 +11:00
David Crawshaw
72dbf26f63 derp: test that client a->b and a->c relaying do not interfere 
Without the recent write deadline introduction, this test fails.

They still do interfere, but the interference is now bound by
the write deadline. Many improvements are possible.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
 2020-03-12 14:42:48 -04:00
David Crawshaw
e838b3fb59 derp: use a write timeout when sending to clients 
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
 2020-03-12 14:42:48 -04:00
David Crawshaw
3df1b97ea8 derp: do not treat failure to relay as the fault of the sender 
If Alice attempts to send a packet to Bob and the DERP server
encounters an error on the socket to Bob, we should not disconnect
Alice for that.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
 2020-03-12 14:42:48 -04:00
David Crawshaw
43aa8595dd derp: introduce Conn interface 
This lets us test with something other than a net.Conn.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
 2020-03-12 14:42:48 -04:00
Brad Fitzpatrick
4fd29349b9 derp: add clients_replaced counter 
Updates #109
 2020-03-11 11:55:43 -07:00
Brad Fitzpatrick
39c0ae1dba derp/derpmap: new DERP config package, merge netcheck into magicsock more 
Fixes #153
Updates #162
Updates #163

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-10 10:37:25 -07:00
Brad Fitzpatrick
5d8001d0ad derp: add varz for home moves 
Updates #162
Updates #163 (maybe)

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-09 11:09:27 -07:00
Brad Fitzpatrick
e733fa6f7e derp: add some varz tests for active/home conns 2020-03-05 20:29:07 -08:00
Brad Fitzpatrick
dd456f04c5 derp: actually record client's preferred bit 2020-03-05 19:02:54 -08:00
Brad Fitzpatrick
6978b93bdd derp, magicsock: track home (preferred) vs visiting connections for stats 2020-03-05 15:00:56 -08:00
Brad Fitzpatrick
cf4aacde57 derp/derphttp: appease staticcheck 2020-03-05 12:34:57 -08:00
Brad Fitzpatrick
2cff9016e4 net/dnscache: add overly simplistic DNS cache package for selective use 
I started to write a full DNS caching resolver and I realized it was
overkill and wouldn't work on Windows even in Go 1.14 yet, so I'm
doing this tiny one instead for now, just for all our netcheck STUN
derp lookups, and connections to DERP servers. (This will be caching a
exactly 8 DNS entries, all ours.)

Fixes #145 (can be better later, of course)
 2020-03-05 12:23:37 -08:00
Brad Fitzpatrick
bf704a5218 derp: protocol negotiation, add v2: send src pub keys to clients in packets 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-04 09:55:13 -08:00
David Crawshaw
9be9738f62 derphttp: add TLSConfig field 
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
 2020-03-04 12:40:33 -05:00
Brad Fitzpatrick
e371520cc5 tsweb, derp: add expvar http.Handler for Prometheus's format 
And add some opinions.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-03 13:59:16 -08:00
Brad Fitzpatrick
517a91de75 derp/derphttp: fix reconnect behavior 
I broke it in today's 752146a70f.

Added some comments to prevent recurrences.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-28 13:39:48 -08:00
Brad Fitzpatrick
d59d0576af derp: don't log on all dropped packets; super spammy 
Signed-off-by: Brad Fitzpatrick <brad@danga.com>
 2020-02-28 13:33:47 -08:00
Brad Fitzpatrick
38acccad09 derp: remove some debug noise I left in 
:(
 2020-02-28 13:20:56 -08:00
Brad Fitzpatrick
752146a70f derp: clean up derphttp client code, use contexts 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-28 13:18:59 -08:00
Brad Fitzpatrick
3317531021 derp: fix JSON field typo, sort fields to make it easier to see inconsistencies 2020-02-21 14:18:09 -08:00
Brad Fitzpatrick
6cd81d5d1f derp: add more derp stats for dropped and received packets 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-21 14:13:50 -08:00
Brad Fitzpatrick
2612e54ad1 derp, cmd/derper: add debug handlers, stats 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-21 09:35:53 -08:00
Brad Fitzpatrick
379a3125fd derp, wgengine/magicsock: support more than just packets from Client.Recv 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-20 22:08:13 -08:00
Brad Fitzpatrick
88f1cc0c98 derp, cmd/derper: add rate limiting support, add default 5Mbps limit 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-20 15:26:30 -08:00
Brad Fitzpatrick
1166c34f6c derp: fix staticcheck warning 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-20 14:49:47 -08:00
Brad Fitzpatrick
322cb58b14 derp: deflake test I flaked up in earlier change 
I broke an invariant in 11048b8932 (it was even nicely
documented then).

Also clean up the test a bit from while I was debugging it.

Fixes #84

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-20 14:41:39 -08:00
Brad Fitzpatrick
f029c4c82d derp: change the protocol framing to always include a length 
Addresses one of crawshaw's TODOs.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-20 13:37:44 -08:00
Brad Fitzpatrick
11048b8932 derp: add docs on current protocol overview, break accept apart a bit 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-20 09:57:05 -08:00
Brad Fitzpatrick
79af6054bf derp: don't start sending keepalives to client until after serverInfo sent 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-20 09:34:01 -08:00
Brad Fitzpatrick
1155716318 derp: rename some things in the client, add some docs 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-20 09:11:56 -08:00
Brad Fitzpatrick
4b461c2e77 derp: rename some things in the server, add some docs 2020-02-20 08:50:25 -08:00
Brad Fitzpatrick
619697063e derp: more misc cleanups 
And add an explicit derphttp.Client.Connect in the test now that it's
done lazily.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-18 10:09:37 -08:00
Brad Fitzpatrick
e06ca40650 wgengine, magicsock, derp: misc cleanups, docs 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-18 08:58:00 -08:00
Brad Fitzpatrick
259406e797 derp: move away from [32]byte key types 
And some minor cleanup in the process.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-17 14:18:09 -08:00
Brad Fitzpatrick
769e25e37b derp: use new types/key package 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-17 13:29:49 -08:00
Brad Fitzpatrick
2896be60db Move "logger" package to under types, now that we have it. 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-14 20:23:05 -08:00
Brad Fitzpatrick
a59dc5f155 Use logger.Logf consistently. It was used in most places. 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-11 09:38:32 -08:00
Earl Lee
a8d8b8719a Move Linux client & common packages into a public repo. 2020-02-09 09:32:57 -08:00