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24 lines
1.2 KiB
Go
24 lines
1.2 KiB
Go
//go:build !linux && !darwin && !windows && !android
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package dns
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// readSystemDNS returns nil on platforms where automatic DNS discovery is not
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// implemented (freebsd, etc.). Callers should fall back to a statically
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// configured DNS server.
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//
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// android and ios are excluded from this constraint (and have their own
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// sysresolver_android.go / sysresolver_ios.go with an explicit "android" /
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// "ios" tag) rather than falling through the "!linux" / "!darwin" catch-all
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// here:
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// - wireguard-android's build passes "-tags linux" to share Linux netlink code
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// (a deliberate, long-standing convention, since Android's kernel is Linux), and Go's
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// build constraint evaluator can't distinguish a custom "-tags linux" from the real
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// GOOS=linux - so with that tag set, "!linux" is false even though GOOS is actually
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// android, and this file would silently stop applying, leaving readSystemDNS undefined.
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// - Go's build constraint evaluator treats GOOS=ios as implicitly satisfying the
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// "darwin" tag as well as "ios", so "!darwin" is false on an iOS build too, which
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// would otherwise leave readSystemDNS undefined there as well.
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func readSystemDNS() []string {
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return nil
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}
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