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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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dns	ipn/ipnlocal, net/dns*, util/cloudenv: specialize DNS config on Google Cloud	2 years ago
dnscache	ipn/ipnlocal, net/dns*, util/cloudenv: specialize DNS config on Google Cloud	2 years ago
dnsfallback	net/dnsfallback: update from 'go generate'	2 years ago
flowtrack	all: use any instead of interface{}	2 years ago
interfaces	net/interfaces: add FreeBSD default route lookup (portmapping, etc)	2 years ago
netcheck	all: gofmt all	2 years ago
neterror	net/{neterror,dns/resolver}: move PacketWasTruncated to neterror from DNS code	3 years ago
netknob	all: disable TCP keep-alives on iOS/Android	3 years ago
netns	wasm: exclude code that's not used on iOS for Wasm too	2 years ago
netstat	all: gofmt with Go 1.17	3 years ago
nettest	net/nettest: deflake TestPipeTimeout	3 years ago
netutil	net/netutil: add CheckIPForwardingLinux (#4301)	2 years ago
packet	*: use WireGuard where logged, printed or named	2 years ago
portmapper	net/portmapper: send discovery packet for IGD specifically.	2 years ago
proxymux	net/proxymux: add a listener mux that can run SOCKS and HTTP on a single socket.	3 years ago
socks5	socks5: add a simple test	2 years ago
speedtest	all: fix spelling mistakes	3 years ago
stun	all: gofmt with Go 1.17	3 years ago
tlsdial	envknob: add new package for all the strconv.ParseBool(os.Getenv(..))	2 years ago
tsaddr	net/dns/resolver, net/tsaddr: fix reverse lookups in 4to6 IP range	2 years ago
tsdial	net/tsdial: add SystemDial as a wrapper on netns.Dial	2 years ago
tshttpproxy	net/tshttpproxy: synology: pick proxy by scheme	2 years ago
tstun	wgengine/netstack: make netstack MTU be 1280 also	2 years ago