6 Commits (95f266f1ceeab1c9007ea9bc63670d3afa2d04a3)

Author	SHA1	Message	Date
Andrew Dunham	e33bc64cff	net/dnsfallback: add singleflight to recursive resolver ... This prevents running more than one recursive resolution for the same hostname in parallel, which can use excessive amounts of CPU when called in a tight loop. Additionally, add tests that hit the network (when run with a flag) to test the lookup behaviour. Updates tailscale/corp#15261 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I39351e1d2a8782dd4c52cb04b3bd982eb651c81e	1 year ago
Mihai Parparita	9a655a1d58	net/dnsfallback: more explicitly pass through logf function ... Redoes the approach from #5550 and #7539 to explicitly pass in the logf function, instead of having global state that can be overridden. Signed-off-by: Mihai Parparita <mihai@tailscale.com>	2 years ago
Will Norris	71029cea2d	all: update copyright and license headers ... This updates all source files to use a new standard header for copyright and license declaration. Notably, copyright no longer includes a date, and we now use the standard SPDX-License-Identifier header. This commit was done almost entirely mechanically with perl, and then some minimal manual fixes. Updates #6865 Signed-off-by: Will Norris <will@tailscale.com>	2 years ago
Andrew Dunham	f52a659076	net/dnsfallback: allow setting log function (#5550) ... This broke a test in corp that enforces we don't use the log package. Signed-off-by: Andrew Dunham <andrew@tailscale.com>	2 years ago
Andrew Dunham	b8596f2a2f	net/dnsfallback: cache most recent DERP map on disk (#5545) ... This is especially helpful as we launch newer DERPs over time, and older clients have progressively out-of-date static DERP maps baked in. After this, as long as the client has successfully connected once, it'll cache the most recent DERP map it knows about. Resolves an in-code comment from @bradfitz Signed-off-by: Andrew Dunham <andrew@du.nham.ca>	2 years ago
Brad Fitzpatrick	10d7c2583c	net/dnsfallback: don't depend on derpmap.Prod ... Move derpmap.Prod to a static JSON file (go:generate'd) instead, to make its role explicit. And add a TODO about making dnsfallback use an update-over-time DERP map file instead of a baked-in one. Updates #1264 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago