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net/dnscache: do not PreferGo on macOS/iOS

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With this commit my iPhone can now DERP.
This commit is contained in:
David Crawshaw 2020-03-09 14:19:29 -04:00
parent 5d8001d0ad
commit cac68fe102
1 changed files with 15 additions and 3 deletions
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18
net/dnscache/dnscache.go
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@ -10,15 +10,27 @@
"context"
"fmt"
"net"
"runtime"
"sync"
"time"
"golang.org/x/sync/singleflight"
)
var single = &Resolver{
Forward: &net.Resolver{PreferGo: true},
}
var single = func() *Resolver {
r := &Resolver{
Forward: &net.Resolver{PreferGo: true},
}
// There does not appear to be a local resolver running
// on iOS, and NetworkExtension is good at isolating DNS.
// So do not use the Go resolver on macOS/iOS.
if runtime.GOOS == "darwin" {
r.Forward.PreferGo = false
}
return r
}()
// Get returns a caching Resolver singleton.
func Get() *Resolver { return single }