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package com.wireguard.android.backend;
import android.content.Context;
import android.system.ErrnoException;
import android.system.OsConstants;
import android.util.Log;
import com.wireguard.android.model.Tunnel;
import com.wireguard.android.model.Tunnel.State;
import com.wireguard.android.model.Tunnel.Statistics;
import com.wireguard.android.util.RootShell;
import com.wireguard.config.Config;
import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java9.util.stream.Collectors;
import java9.util.stream.Stream;
/**
* WireGuard backend that uses {@code wg-quick} to implement tunnel configuration.
*/
public final class WgQuickBackend implements Backend {
private static final String TAG = "WireGuard/" + WgQuickBackend.class.getSimpleName();
private final Context context;
private final RootShell rootShell;
public WgQuickBackend(final Context context, final RootShell rootShell) {
this.context = context;
this.rootShell = rootShell;
}
private static State resolveState(final State currentState, State requestedState) {
if (requestedState == State.TOGGLE)
requestedState = currentState == State.UP ? State.DOWN : State.UP;
return requestedState;
}
@Override
public Config applyConfig(final Tunnel tunnel, final Config config) {
if (tunnel.getState() == State.UP)
throw new UnsupportedOperationException("Not implemented");
return config;
}
@Override
public Set<String> enumerate() {
final List<String> output = new ArrayList<>();
// Don't throw an exception here or nothing will show up in the UI.
try {
if (rootShell.run(output, "wg show interfaces") != 0 || output.isEmpty())
return Collections.emptySet();
} catch (final Exception ignored) {
return Collections.emptySet();
}
// wg puts all interface names on the same line. Split them into separate elements.
return Stream.of(output.get(0).split(" ")).collect(Collectors.toUnmodifiableSet());
}
@Override
public State getState(final Tunnel tunnel) {
Log.v(TAG, "Requested state for tunnel " + tunnel.getName());
return enumerate().contains(tunnel.getName()) ? State.UP : State.DOWN;
}
@Override
public Statistics getStatistics(final Tunnel tunnel) {
return new Statistics();
}
@Override
public State setState(final Tunnel tunnel, final State state) throws Exception {
Log.v(TAG, "Requested state change to " + state + " for tunnel " + tunnel.getName());
final State originalState = getState(tunnel);
final State resolvedState = resolveState(originalState, state);
if (resolvedState == originalState)
return originalState;
final int result;
if (resolvedState == State.UP) {
if (!new File("/sys/module/wireguard").exists())
throw new ErrnoException("WireGuard module not loaded", OsConstants.ENODEV);
// FIXME: Assumes file layout from FileConfigStore. Use a temporary file.
final File file = new File(context.getFilesDir(), tunnel.getName() + ".conf");
result = rootShell.run(null, String.format("wg-quick up '%s'", file.getAbsolutePath()));
} else {
result = rootShell.run(null, String.format("wg-quick down '%s'", tunnel.getName()));
}
if (result != 0)
throw new Exception("wg-quick failed");
return getState(tunnel);
}
}
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