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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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ipnlocal	ipn/ipnlocal, net/dns*, util/cloudenv: specialize DNS config on Google Cloud	2 years ago
ipnserver	ipn/ipnserver, cmd/tailscaled: fix peerapi on Windows	2 years ago
ipnstate	ipn/ipnstate: add ExitNodeStatus to share the exit node if it is in use, the IP, ID and whether its online. (#4761)	2 years ago
localapi	wasm: exclude code that's not used on iOS for Wasm too	2 years ago
policy	ipn/policy: treat DNS service as interesting so it's not filtered out	3 years ago
store	util/mak: move tailssh's mapSet into a new package for reuse elsewhere	2 years ago
backend.go	ipn/ipnlocal: move Ping method from IPN bus to LocalBackend (HTTP)	2 years ago
doc.go	Move Linux client & common packages into a public repo.	4 years ago
fake_test.go	ipn/ipnlocal: move Ping method from IPN bus to LocalBackend (HTTP)	2 years ago
handle.go	ipn: remove FakeExpireAfter Backend function	2 years ago
ipn_clone.go	cmd/cloner,util/codegen: refactor cloner internals to allow reuse	2 years ago
message.go	ipn/ipnlocal: move Ping method from IPN bus to LocalBackend (HTTP)	2 years ago
message_test.go	all: use any instead of interface{}	2 years ago
prefs.go	ipn/ipnlocal: shutdown sshServer on tailscale down	2 years ago
prefs_test.go	ipn: remove enforceDefaults option from PrefsFromBytes	2 years ago
store.go	ipn/store: add common package for instantiating ipn.StateStores	2 years ago