50 Commits (f95785f22ba7cdab7355f6f96a120eba7c17e2e5)

Author	SHA1	Message	Date
Brad Fitzpatrick	c6af5bbfe8	all: add test for package comments, fix, add comments as needed ... Updates #cleanup Change-Id: Ic4304e909d2131a95a38b26911f49e7b1729aaef Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 months ago
Andrew Dunham	24976b5bfd	cmd/tailscale/cli: actually perform Noise request in 'debug ts2021' ... This actually performs a Noise request in the 'debug ts2021' command, instead of just exiting once we've dialed a connection. This can help debug certain forms of captive portals and deep packet inspection that will allow a connection, but will RST the connection when trying to send data on the post-upgraded TCP connection. Updates #1634 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I1e46ca9c9a0751c55f16373a6a76cdc24fec1f18	5 months ago
Andrew Dunham	732605f961	control/controlclient: move noiseConn to internal package ... So that it can be later used in the 'tailscale debug ts2021' function in the CLI, to aid in debugging captive portals/WAFs/etc. Updates #1634 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Iec9423f5e7570f2c2c8218d27fc0902137e73909	5 months ago
Andrew Dunham	280255acae	various: add golangci-lint, fix issues (#7905) ... This adds an initial and intentionally minimal configuration for golang-ci, fixes the issues reported, and adds a GitHub Action to check new pull requests against this linter configuration. Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I8f38fbc315836a19a094d0d3e986758b9313f163	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
Brad Fitzpatrick	da8def8e13	all: remove old +build tags ... The //go:build syntax was introduced in Go 1.17: https://go.dev/doc/go1.17#build-lines gofmt has kept the +build and go:build lines in sync since then, but enough time has passed. Time to remove them. Done with: perl -i -npe 's,^// \+build.*\n,,' $(git grep -l -F '+build') Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	7c671b0220	.github/workflows: add gofmt (goimports) check ... Change-Id: Iceb3182827b9c65f28f0351e0e254abe4a95e4de Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	700badd8f8	util/deephash: move internal/deephash to util/deephash ... No code changes. Just a minor package doc addition about lack of API stability.	3 years ago
Josh Bleecher Snyder	7f095617f2	internal/deephash: 8 bits of output is not enough ... Running hex.Encode(b, b) is a bad idea. The first byte of input will overwrite the first two bytes of output. Subsequent bytes have no impact on the output. Not related to today's IPv6 bug, but...wh::ps. This caused us to spuriously ignore some wireguard config updates. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Josh Bleecher Snyder	c065cc6169	internal/deephash: remove remaining type special cases ... Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	4b51fbf48c	internal/deephash: increase scratch space size ... e66d4e4c81 added AppendTo methods to some key types. Their marshaled form is longer than 64 bytes. name old time/op new time/op delta Hash-8 15.5µs ± 1% 14.8µs ± 1% -4.17% (p=0.000 n=9+9) name old alloc/op new alloc/op delta Hash-8 1.18kB ± 0% 0.47kB ± 0% -59.87% (p=0.000 n=10+10) name old allocs/op new allocs/op delta Hash-8 12.0 ± 0% 6.0 ± 0% -50.00% (p=0.000 n=10+10) This is still a bit worse than explicitly handling the types, but much nicer. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	b340beff8e	internal/deephash: reset scratch before appending to it ... Oops. In practice this doesn't matter, but it's still wrong. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	15a7ff83de	internal/deephash: remove netaddr special cases ... All netaddr types that we are concerned with now implement AppendTo. Use the AppendTo method if available, and remove all references to netaddr. This is slower but cleaner, and more readily re-usable by others. name old time/op new time/op delta Hash-8 12.6µs ± 0% 14.8µs ± 1% +18.05% (p=0.000 n=8+10) HashMapAcyclic-8 21.4µs ± 1% 21.9µs ± 1% +2.39% (p=0.000 n=10+9) name old alloc/op new alloc/op delta Hash-8 408B ± 0% 408B ± 0% ~ (p=1.000 n=10+10) HashMapAcyclic-8 1.00B ± 0% 1.00B ± 0% ~ (all equal) name old allocs/op new allocs/op delta Hash-8 6.00 ± 0% 6.00 ± 0% ~ (all equal) HashMapAcyclic-8 0.00 0.00 ~ (all equal) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	051d2f47e5	internal/deephash: re-use MapIter ... name old time/op new time/op delta Hash-8 12.4µs ± 0% 12.4µs ± 0% -0.33% (p=0.002 n=10+9) HashMapAcyclic-8 21.2µs ± 0% 21.3µs ± 0% +0.45% (p=0.000 n=8+8) name old alloc/op new alloc/op delta Hash-8 793B ± 0% 408B ± 0% -48.55% (p=0.000 n=10+10) HashMapAcyclic-8 128B ± 0% 0B -100.00% (p=0.000 n=10+10) name old allocs/op new allocs/op delta Hash-8 9.00 ± 0% 6.00 ± 0% -33.33% (p=0.000 n=10+10) HashMapAcyclic-8 1.00 ± 0% 0.00 -100.00% (p=0.000 n=10+10) Depends on https://github.com/golang/go/issues/46293. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	c06ec45f09	internal/deephash: document MapIter shims ... These exist so we can use the optimized MapIter APIs while still working with released versions of Go. They're pretty simple, but some docs won't hurt. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	ce7a87e5e4	internal/deephash: use hash.BlockSize instead of a constant ... Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	135b641332	internal/deephash: add re-usable scratch space ... name old time/op new time/op delta Hash-8 13.9µs ± 0% 12.5µs ± 0% -10.10% (p=0.008 n=5+5) name old alloc/op new alloc/op delta Hash-8 793B ± 0% 793B ± 0% ~ (all equal) name old allocs/op new allocs/op delta Hash-8 14.0 ± 0% 12.0 ± 0% -14.29% (p=0.008 n=5+5) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	988dfcabef	internal/deephash: simplify API ... Reduce to just a single external endpoint. Convert from a variadic number of interfaces to a slice there. name old time/op new time/op delta Hash-8 14.4µs ± 0% 14.0µs ± 1% -3.08% (p=0.000 n=9+9) name old alloc/op new alloc/op delta Hash-8 873B ± 0% 793B ± 0% -9.16% (p=0.000 n=9+6) name old allocs/op new allocs/op delta Hash-8 18.0 ± 0% 14.0 ± 0% -22.22% (p=0.000 n=10+10) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	b371588ce6	internal/deephash: use netaddr AppendTo methods ... Slightly slower, but lots less garbage. We will recover the speed lost in a follow-up commit. name old time/op new time/op delta Hash-8 13.5µs ± 1% 14.3µs ± 0% +5.84% (p=0.000 n=10+9) name old alloc/op new alloc/op delta Hash-8 1.46kB ± 0% 0.87kB ± 0% -40.10% (p=0.000 n=7+10) name old allocs/op new allocs/op delta Hash-8 43.0 ± 0% 18.0 ± 0% -58.14% (p=0.000 n=10+10) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	09afb8e35b	internal/deephash: re-use map iteration values ... This requires changes to the Go toolchain. The changes are upstream at https://golang.org/cl/320929. They haven't been pulled into our fork yet. No need to allocate new iteration scratch values for every map. name old time/op new time/op delta Hash-8 13.6µs ± 0% 13.5µs ± 0% -1.01% (p=0.008 n=5+5) HashMapAcyclic-8 21.2µs ± 1% 21.1µs ± 2% ~ (p=0.310 n=5+5) name old alloc/op new alloc/op delta Hash-8 1.58kB ± 0% 1.46kB ± 0% -7.60% (p=0.008 n=5+5) HashMapAcyclic-8 152B ± 0% 128B ± 0% -15.79% (p=0.008 n=5+5) name old allocs/op new allocs/op delta Hash-8 49.0 ± 0% 43.0 ± 0% -12.24% (p=0.008 n=5+5) HashMapAcyclic-8 4.00 ± 0% 2.00 ± 0% -50.00% (p=0.008 n=5+5) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	a2d7a2aeb1	internal/deephash: use MapIter.Set{Key,Value} ... To get the benefit of this optimization requires help from the Go toolchain. The changes are upstream at https://golang.org/cl/320929, and have been pulled into the Tailscale fork at 728ecc58fd. It also requires building with the build tag tailscale_go. name old time/op new time/op delta Hash-8 14.0µs ± 0% 13.6µs ± 0% -2.88% (p=0.008 n=5+5) HashMapAcyclic-8 24.3µs ± 1% 21.2µs ± 1% -12.47% (p=0.008 n=5+5) name old alloc/op new alloc/op delta Hash-8 2.16kB ± 0% 1.58kB ± 0% -27.01% (p=0.008 n=5+5) HashMapAcyclic-8 2.53kB ± 0% 0.15kB ± 0% -93.99% (p=0.008 n=5+5) name old allocs/op new allocs/op delta Hash-8 77.0 ± 0% 49.0 ± 0% -36.36% (p=0.008 n=5+5) HashMapAcyclic-8 202 ± 0% 4 ± 0% -98.02% (p=0.008 n=5+5) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com> setkey	4 years ago
Josh Bleecher Snyder	020e904f4e	internal/deephash: add special handling for netaddr.IPPort ... The acyclic map code interacts badly with netaddr.IPs. One of the netaddr.IP fields is an *intern.Value, and we use a few sentinel values. Those sentinel values make many of the netaddr data structures appear cyclic. One option would be to replace the cycle-detection code with a Floyd-Warshall style algorithm. The downside is that this will take longer to detect cycles, particularly if the cycle is long. This problem is exacerbated by the fact that the acyclic cycle detection code shares a single visited map for the entire data structure, not just the subsection of the data structure localized to the map. Unfortunately, the extra allocations and work (and code) to use per-map visited maps make this option not viable. Instead, continue to special-case netaddr data types. name old time/op new time/op delta Hash-8 22.4µs ± 0% 14.0µs ± 0% -37.59% (p=0.008 n=5+5) HashMapAcyclic-8 23.8µs ± 0% 24.3µs ± 1% +1.75% (p=0.008 n=5+5) name old alloc/op new alloc/op delta Hash-8 2.49kB ± 0% 2.16kB ± 0% ~ (p=0.079 n=4+5) HashMapAcyclic-8 2.53kB ± 0% 2.53kB ± 0% ~ (all equal) name old allocs/op new allocs/op delta Hash-8 86.0 ± 0% 77.0 ± 0% -10.47% (p=0.008 n=5+5) HashMapAcyclic-8 202 ± 0% 202 ± 0% ~ (all equal) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	bbb79f2d6a	internal/deephash: fix accidental naked return ... name old time/op new time/op delta Hash-8 23.0µs ± 1% 22.4µs ± 0% -2.43% (p=0.008 n=5+5) HashMapAcyclic-8 24.0µs ± 0% 23.8µs ± 0% -0.56% (p=0.008 n=5+5) name old alloc/op new alloc/op delta Hash-8 2.92kB ± 0% 2.49kB ± 0% -14.80% (p=0.000 n=5+4) HashMapAcyclic-8 2.53kB ± 0% 2.53kB ± 0% ~ (all equal) name old allocs/op new allocs/op delta Hash-8 93.0 ± 0% 86.0 ± 0% -7.53% (p=0.008 n=5+5) HashMapAcyclic-8 202 ± 0% 202 ± 0% ~ (all equal) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Brad Fitzpatrick	79b7fa9ac3	internal/deephash: hash maps without sorting in the acyclic common case ... Hash and xor each entry instead, then write final xor'ed result. name old time/op new time/op delta Hash-4 33.6µs ± 4% 34.6µs ± 3% +3.03% (p=0.013 n=10+9) name old alloc/op new alloc/op delta Hash-4 1.86kB ± 0% 1.77kB ± 0% -5.10% (p=0.000 n=10+9) name old allocs/op new allocs/op delta Hash-4 51.0 ± 0% 49.0 ± 0% -3.92% (p=0.000 n=10+10) Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Josh Bleecher Snyder	cd54792fe9	internal/deephash: add a few more benchmarking map entries ... Typical maps in production are considerably longer. This helps benchmarks more accurately reflect the costs per key vs the costs per map in deephash. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	25df067dd0	all: adapt to opaque netaddr types ... This commit is a mishmash of automated edits using gofmt: gofmt -r 'netaddr.IPPort{IP: a, Port: b} -> netaddr.IPPortFrom(a, b)' -w . gofmt -r 'netaddr.IPPrefix{IP: a, Port: b} -> netaddr.IPPrefixFrom(a, b)' -w . gofmt -r 'a.IP.Is4 -> a.IP().Is4' -w . gofmt -r 'a.IP.As16 -> a.IP().As16' -w . gofmt -r 'a.IP.Is6 -> a.IP().Is6' -w . gofmt -r 'a.IP.As4 -> a.IP().As4' -w . gofmt -r 'a.IP.String -> a.IP().String' -w . And regexps: \w*(.*)\.Port = (.*) -> $1 = $1.WithPort($2) \w*(.*)\.IP = (.*) -> $1 = $1.WithIP($2) And lots of manual fixups. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	aacb2107ae	all: add extra information to serialized endpoints ... magicsock.Conn.ParseEndpoint requires a peer's public key, disco key, and legacy ip/ports in order to do its job. We currently accomplish that by: * adding the public key in our wireguard-go fork * encoding the disco key as magic hostname * using a bespoke comma-separated encoding It's a bit messy. Instead, switch to something simpler: use a json-encoded struct containing exactly the information we need, in the form we use it. Our wireguard-go fork still adds the public key to the address when it passes it to ParseEndpoint, but now the code compensating for that is just a couple of simple, well-commented lines. Once this commit is in, we can remove that part of the fork and remove the compensating code. Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>	4 years ago
Brad Fitzpatrick	36a26e6a71	internal/deephash: rename from deepprint ... Yes, it printed, but that was an implementation detail for hashing. And coming optimization will make it print even less. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Josh Bleecher Snyder	6ab2176dc7	internal/deepprint: improve benchmark ... This more closely matches our real usage of deepprint. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	712774a697	internal/deepprint: close struct curly parens ... Not that it matters, but we were missing a close parens. It's cheap, so add it. name old time/op new time/op delta Hash-8 6.64µs ± 0% 6.67µs ± 1% +0.42% (p=0.008 n=9+10) name old alloc/op new alloc/op delta Hash-8 1.54kB ± 0% 1.54kB ± 0% ~ (all equal) name old allocs/op new allocs/op delta Hash-8 37.0 ± 0% 37.0 ± 0% ~ (all equal) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	8368bac847	internal/deepprint: stop printing struct field names ... The struct field names don't change within a single run, so they are irrelevant. Use the field index instead. name old time/op new time/op delta Hash-8 6.52µs ± 0% 6.64µs ± 0% +1.91% (p=0.000 n=6+9) name old alloc/op new alloc/op delta Hash-8 1.67kB ± 0% 1.54kB ± 0% -7.66% (p=0.000 n=10+10) name old allocs/op new allocs/op delta Hash-8 53.0 ± 0% 37.0 ± 0% -30.19% (p=0.000 n=10+10) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	dfa0c90955	internal/deepprint: replace Fprintf(w, const) with w.WriteString ... name old time/op new time/op delta Hash-8 7.77µs ± 0% 6.29µs ± 1% -19.11% (p=0.000 n=9+10) name old alloc/op new alloc/op delta Hash-8 1.67kB ± 0% 1.67kB ± 0% ~ (all equal) name old allocs/op new allocs/op delta Hash-8 53.0 ± 0% 53.0 ± 0% ~ (all equal) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	d4f805339e	internal/deepprint: special-case some common types ... These show up a lot in our data structures. name old time/op new time/op delta Hash-8 11.5µs ± 1% 7.8µs ± 1% -32.17% (p=0.000 n=10+10) name old alloc/op new alloc/op delta Hash-8 1.98kB ± 0% 1.67kB ± 0% -15.73% (p=0.000 n=10+10) name old allocs/op new allocs/op delta Hash-8 82.0 ± 0% 53.0 ± 0% -35.37% (p=0.000 n=10+10) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	752f8c0f2f	internal/deepprint: buffer writes ... The sha256 hash writer doesn't implement WriteString. (See https://github.com/golang/go/issues/38776.) As a consequence, we end up converting many strings to []byte. Wrapping a bufio.Writer around the hash writer lets us avoid these conversions by using WriteString. Using a bufio.Writer is, perhaps surprisingly, almost as cheap as using unsafe. The reason is that the sha256 writer does internal buffering, but doesn't do any when handed larger writers. Using a bufio.Writer merely shifts the data copying from one buffer to a different one. Using a concrete type for Print and print cuts 10% off of the execution time. name old time/op new time/op delta Hash-8 15.3µs ± 0% 11.5µs ± 0% -24.84% (p=0.000 n=10+10) name old alloc/op new alloc/op delta Hash-8 2.82kB ± 0% 1.98kB ± 0% -29.57% (p=0.000 n=10+10) name old allocs/op new allocs/op delta Hash-8 140 ± 0% 82 ± 0% -41.43% (p=0.000 n=10+10) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	7891b34266	internal/deepprint: add BenchmarkHash ... deepprint currently accounts for 15% of allocs in tailscaled. This is a useful benchmark to have. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
David Anderson	4c61ebacf4	wgengine: move DNS configuration out of wgengine/router. ... Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
Josh Bleecher Snyder	69cdc30c6d	wgengine/wgcfg: remove Config.ListenPort ... We don't use the port that wireguard-go passes to us (via magicsock.connBind.Open). We ignore it entirely and use the port we selected. When we tell wireguard-go that we're changing the listen_port, it calls connBind.Close and then connBind.Open. And in the meantime, it stops calling the receive functions, which means that we stop receiving and processing UDP and DERP packets. And that is Very Bad. That was never a problem prior to b3ceca1dd7, because we passed the SkipBindUpdate flag to our wireguard-go fork, which told wireguard-go not to re-bind on listen_port changes. That commit eliminated the SkipBindUpdate flag. We could write a bunch of code to work around the gap. We could add background readers that process UDP and DERP packets when wireguard-go isn't. But it's simpler to never create the conditions in which wireguard-go rebinds. The other scenario in which wireguard-go re-binds is device.Down. Conveniently, we never call device.Down. We go from device.Up to device.Close, and the latter only when we're shutting down a magicsock.Conn completely. Rubber-ducked-by: Avery Pennarun <apenwarr@tailscale.com> Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
David Anderson	8af9d770cf	net/dns: rename Config to OSConfig. ... Making way for a new higher level config struct. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	672731ac6f	many: gofmt. ... Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	9f7f2af008	wgengine/router/dns: move to net/dns. ... Preparation for merging the APIs and whatnot. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
Josh Bleecher Snyder	fe7c3e9c17	all: move wgcfg from wireguard-go ... This is mostly code movement from the wireguard-go repo. Most of the new wgcfg package corresponds to the wireguard-go wgcfg package. wgengine/wgcfg/device{_test}.go was device/config{_test}.go. There were substantive but simple changes to device_test.go to remove internal package device references. The API of device.Config (now wgcfg.DeviceConfig) grew an error return; we previously logged the error and threw it away. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	654b5f1570	all: convert from []wgcfg.Endpoint to string ... This eliminates a dependency on wgcfg.Endpoint, as part of the effort to eliminate our wireguard-go fork. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	2fe770ed72	all: replace wgcfg.IP and wgcfg.CIDR with netaddr types ... Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Brad Fitzpatrick	7795fcf464	Add tooldeps package to keep depaware pinned in go.mod.	4 years ago
Dmytro Shynkevych	28e52a0492	all: dns refactor, add Proxied and PerDomain flags from control (#615) ... Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>	4 years ago
Dmytro Shynkevych	c7582dc234	ipn: fix netmap change tracking and dns map generation (#609) ... Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>	4 years ago
Dmytro Shynkevych	30bbbe9467	wgengine/router: dns: unify on *BSD, multimode on Linux, Magic DNS (#536) ... Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>	4 years ago
Brad Fitzpatrick	790ef2bc5f	internal/deepprint: update copyright header to appease license checker script ... Plus mention that it's not an exact copy.	4 years ago
Brad Fitzpatrick	7ca911a5c6	internal/deepprint: add missing copyright headers	4 years ago
Brad Fitzpatrick	6f73f2c15a	wgengine, internal/deepprint: replace UAPI usage as hash func; add deepprint ... The new deepprint package just walks a Go data structure and writes to an io.Writer. It's not pretty like go-spew, etc. We then use it to replace the use of UAPI (which we have a TODO to remove) to generate signatures of data structures to detect whether anything changed (without retaining the old copy). This was necessary because the UAPI conversion ends up trying to do DNS lookups which an upcoming change depends on not happening.	4 years ago