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10 Commits

Author SHA1 Message Date
Brad Fitzpatrick
66be052a70 net/dnscache: work on IPv6-only hosts (again) 
This fixes the regression where we had stopped working on IPv6-only
hosts.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2021-01-06 19:53:13 -08:00
Brad Fitzpatrick
a2d78b4d3e net/dnscache, control/controlclient: use DNS cache when dialing control 
Cache DNS results of earlier login.tailscale.com control dials, and use
them for future dials if DNS is slow or broken.

Fixes various issues with trickier setups with the domain's DNS server
behind a subnet router.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-11-11 12:50:04 -08:00
Brad Fitzpatrick
19b0cfe89e all: prepare for GOOS=ios in Go 1.16 
Work with either way for now on iOS (darwin/arm64 vs ios/arm64).

In February when Go 1.16 comes out we'll have a universal binary for
darwin/arm64 (macOS) and will drop support for Go 1.15 and its
darwin/amd64 meaning iOS. (it'll mean macOS).

Context:

* https://tip.golang.org/doc/go1.16#darwin
* https://github.com/golang/go/issues/38485
* https://github.com/golang/go/issues/42100
 2020-11-11 09:17:04 -08:00
David Anderson
657f331e8b net/dnscache: remove unnecessary lint warning. 2020-04-30 20:31:44 -07:00
Elias Naur
ad0795efc2 net/dnscache: don't use the Go resolver on Android 
The local resolver is not available for apps on Android.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
 2020-04-27 12:04:39 -07:00
Brad Fitzpatrick
bd0e20f351 net/dnscache: ignore annoying staticcheck check 2020-03-09 22:12:22 -07:00
Brad Fitzpatrick
d44325295e net/dnscache: initialize the single Resolver more directly 2020-03-09 21:05:01 -07:00
David Crawshaw
cac68fe102 net/dnscache: do not PreferGo on macOS/iOS 
With this commit my iPhone can now DERP.
 2020-03-09 14:20:09 -04:00
David Crawshaw
5a1ce4adae net/dnscache: parse passed CIDR 
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
 2020-03-09 13:11:35 -04:00
Brad Fitzpatrick
2cff9016e4 net/dnscache: add overly simplistic DNS cache package for selective use 
I started to write a full DNS caching resolver and I realized it was
overkill and wouldn't work on Windows even in Go 1.14 yet, so I'm
doing this tiny one instead for now, just for all our netcheck STUN
derp lookups, and connections to DERP servers. (This will be caching a
exactly 8 DNS entries, all ours.)

Fixes #145 (can be better later, of course)
 2020-03-05 12:23:37 -08:00