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Brad Fitzpatrick 88c2afd1e3 ipn/ipnlocal, net/dns*, util/cloudenv: specialize DNS config on Google Cloud ... This does three things: * If you're on GCP, it adds a *.internal DNS split route to the metadata server, so we never break GCP DNS names. This lets people have some Tailscale nodes on GCP and some not (e.g. laptops at home) without having to add a Tailnet-wide *.internal DNS route. If you already have such a route, though, it won't overwrite it. * If the 100.100.100.100 DNS forwarder has nowhere to forward to, it forwards it to the GCP metadata IP, which forwards to 8.8.8.8. This means there are never errNoUpstreams ("upstream nameservers not set") errors on GCP due to e.g. mangled /etc/resolv.conf (GCP default VMs don't have systemd-resolved, so it's likely a DNS supremacy fight) * makes the DNS fallback mechanism use the GCP metadata IP as a fallback before our hosted HTTP-based fallbacks I created a default GCP VM from their web wizard. It has no systemd-resolved. I then made its /etc/resolv.conf be empty and deleted its GCP hostnames in /etc/hosts. I then logged in to a tailnet with no global DNS settings. With this, tailscaled writes /etc/resolv.conf (direct mode, as no systemd-resolved) and sets it to 100.100.100.100, which then has regular DNS via the metadata IP and *.internal DNS via the metadata IP as well. If the tailnet configures explicit DNS servers, those are used instead, except for *.internal. This also adds a new util/cloudenv package based on version/distro where the cloud type is only detected once. We'll likely expand it in the future for other clouds, doing variants of this change for other popular cloud environments. Fixes #4911 RELNOTES=Google Cloud DNS improvements Change-Id: I19f3c2075983669b2b2c0f29a548da8de373c7cf Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>		2 years ago
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cibuild	all: use cibuild.On	3 years ago
clientmetric	util/clientmetric: add gauge_ name prefix when uploading names	2 years ago
cloudenv	ipn/ipnlocal, net/dns*, util/cloudenv: specialize DNS config on Google Cloud	2 years ago
cmpver	util/cmpver: move into OSS from corp repo.	3 years ago
codegen	cmd/cloner,util/codegen: refactor cloner internals to allow reuse	2 years ago
deephash	util/deephash: add canMemHash func + typeInfo property	2 years ago
dnsname	all: use Go 1.18's strings.Cut	3 years ago
endian	all: gofmt with Go 1.17	3 years ago
groupmember	util/groupmember: remove redundant code (#4298)	3 years ago
jsonutil	all: use any instead of interface{}	3 years ago
lineread	util/lineread: add docs to Reader	4 years ago
mak	util/mak: move tailssh's mapSet into a new package for reuse elsewhere	2 years ago
multierr	all: use any instead of interface{}	3 years ago
netconv	util/netconv: add package to convert between netip and netaddr types	3 years ago
osshare	all: gofmt with Go 1.17	3 years ago
pidowner	all: gofmt with Go 1.17	3 years ago
racebuild	all: gofmt with Go 1.17	3 years ago
singleflight	util/singleflight: add fork of singleflight with generics	2 years ago
systemd	all: use any instead of interface{}	3 years ago
uniq	all: use any instead of interface{}	3 years ago
winutil	net/dns, paths, util/winutil: change net/dns/windowsManager NRPT management to support more than 50 domains.	2 years ago