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tailscale-android/cmd
Denton Gentry 5c9cec0064 retrieve current DNS servers.
Add getDnsConfigAsString() to retrieve the current DNS
configuration from the Android platform. This implements
several mechanisms to retrieve DNS information, suitable
for different Android versions:

Android 7 and later use ConnectivityManager getAllNetworks(),
then iterate over each network to retrieve DNS servers and
search domains using the LinkProperties.

Android 6 and earlier can only retrieve the currently active
interface using ConnectivityManager getActiveNetwork(), but have
two additional fallback options which leverage the system
properties available in older Android releases.

--------

Also changed how LinkChange notification works, switching from
the older BroadcastReceiver of a ConnectivityManager Intent to
the newer ConnectivityManager.registerNetworkCallback. We need
this because the onAvailable event is too early, we get notified
that LTE is up before its DNS servers have been set. We need
to wait for the onLinkPropertiesChanged event instead, which is
only available with registerNetworkCallback.

Fixes https://github.com/tailscale/tailscale/issues/2116
Updates https://github.com/tailscale/tailscale/issues/988

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
4 years ago
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tailscale retrieve current DNS servers. 4 years ago