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/*
* Copyright © 2017-2019 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.android.backend;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.ParcelFileDescriptor;
import androidx.annotation.Nullable;
import androidx.collection.ArraySet;
import android.util.Log;
import com.wireguard.android.Application;
import com.wireguard.android.R;
import com.wireguard.android.activity.MainActivity;
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.ExceptionLoggers;
import com.wireguard.android.util.SharedLibraryLoader;
import com.wireguard.config.Config;
import com.wireguard.config.InetNetwork;
import com.wireguard.config.Peer;
import java.net.InetAddress;
import java.util.Collections;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java9.util.concurrent.CompletableFuture;
public final class GoBackend implements Backend {
private static final String TAG = "WireGuard/" + GoBackend.class.getSimpleName();
private static CompletableFuture<VpnService> vpnService = new CompletableFuture<>();
private final Context context;
@Nullable private Tunnel currentTunnel;
private int currentTunnelHandle = -1;
public GoBackend(final Context context) {
SharedLibraryLoader.loadSharedLibrary(context, "wg-go");
this.context = context;
}
private static native int wgGetSocketV4(int handle);
private static native int wgGetSocketV6(int handle);
private static native void wgTurnOff(int handle);
private static native int wgTurnOn(String ifName, int tunFd, String settings);
private static native String wgVersion();
@Override
public Config applyConfig(final Tunnel tunnel, final Config config) throws Exception {
if (tunnel.getState() == State.UP) {
// Restart the tunnel to apply the new config.
setStateInternal(tunnel, tunnel.getConfig(), State.DOWN);
try {
setStateInternal(tunnel, config, State.UP);
} catch (final Exception e) {
// The new configuration didn't work, so try to go back to the old one.
setStateInternal(tunnel, tunnel.getConfig(), State.UP);
throw e;
}
}
return config;
}
@Override
public Set<String> enumerate() {
if (currentTunnel != null) {
final Set<String> runningTunnels = new ArraySet<>();
runningTunnels.add(currentTunnel.getName());
return runningTunnels;
}
return Collections.emptySet();
}
@Override
public State getState(final Tunnel tunnel) {
return currentTunnel == tunnel ? State.UP : State.DOWN;
}
@Override
public Statistics getStatistics(final Tunnel tunnel) {
return new Statistics();
}
@Override
public String getTypePrettyName() {
return context.getString(R.string.type_name_go_userspace);
}
@Override
public String getVersion() {
return wgVersion();
}
@Override
public State setState(final Tunnel tunnel, State state) throws Exception {
final State originalState = getState(tunnel);
if (state == State.TOGGLE)
state = originalState == State.UP ? State.DOWN : State.UP;
if (state == originalState)
return originalState;
if (state == State.UP && currentTunnel != null)
throw new IllegalStateException(context.getString(R.string.multiple_tunnels_error));
Log.d(TAG, "Changing tunnel " + tunnel.getName() + " to state " + state);
setStateInternal(tunnel, tunnel.getConfig(), state);
return getState(tunnel);
}
private void setStateInternal(final Tunnel tunnel, @Nullable final Config config, final State state)
throws Exception {
if (state == State.UP) {
Log.i(TAG, "Bringing tunnel up");
Objects.requireNonNull(config, context.getString(R.string.no_config_error));
if (VpnService.prepare(context) != null)
throw new Exception(context.getString(R.string.vpn_not_authorized_error));
final VpnService service;
if (!vpnService.isDone())
startVpnService();
try {
service = vpnService.get(2, TimeUnit.SECONDS);
} catch (final TimeoutException e) {
throw new Exception(context.getString(R.string.vpn_start_error), e);
}
if (currentTunnelHandle != -1) {
Log.w(TAG, "Tunnel already up");
return;
}
// Build config
final String goConfig = config.toWgUserspaceString();
// Create the vpn tunnel with android API
final VpnService.Builder builder = service.getBuilder();
builder.setSession(tunnel.getName());
final Intent configureIntent = new Intent(context, MainActivity.class);
configureIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
builder.setConfigureIntent(PendingIntent.getActivity(context, 0, configureIntent, 0));
for (final String excludedApplication : config.getInterface().getExcludedApplications())
builder.addDisallowedApplication(excludedApplication);
for (final InetNetwork addr : config.getInterface().getAddresses())
builder.addAddress(addr.getAddress(), addr.getMask());
for (final InetAddress addr : config.getInterface().getDnsServers())
builder.addDnsServer(addr.getHostAddress());
for (final Peer peer : config.getPeers()) {
for (final InetNetwork addr : peer.getAllowedIps())
builder.addRoute(addr.getAddress(), addr.getMask());
}
builder.setMtu(config.getInterface().getMtu().orElse(1280));
builder.setBlocking(true);
try (final ParcelFileDescriptor tun = builder.establish()) {
if (tun == null)
throw new Exception(context.getString(R.string.tun_create_error));
Log.d(TAG, "Go backend v" + wgVersion());
currentTunnelHandle = wgTurnOn(tunnel.getName(), tun.detachFd(), goConfig);
}
if (currentTunnelHandle < 0)
throw new Exception(context.getString(R.string.tunnel_on_error, currentTunnelHandle));
currentTunnel = tunnel;
service.protect(wgGetSocketV4(currentTunnelHandle));
service.protect(wgGetSocketV6(currentTunnelHandle));
} else {
Log.i(TAG, "Bringing tunnel down");
if (currentTunnelHandle == -1) {
Log.w(TAG, "Tunnel already down");
return;
}
wgTurnOff(currentTunnelHandle);
currentTunnel = null;
currentTunnelHandle = -1;
}
}
private void startVpnService() {
Log.d(TAG, "Requesting to start VpnService");
context.startService(new Intent(context, VpnService.class));
}
public static class VpnService extends android.net.VpnService {
public Builder getBuilder() {
return new Builder();
}
@Override
public void onCreate() {
vpnService.complete(this);
super.onCreate();
}
@Override
public void onDestroy() {
Application.getTunnelManager().getTunnels().thenAccept(tunnels -> {
for (final Tunnel tunnel : tunnels) {
if (tunnel != null && tunnel.getState() != State.DOWN)
tunnel.setState(State.DOWN);
}
});
vpnService = vpnService.newIncompleteFuture();
super.onDestroy();
}
@Override
public int onStartCommand(@Nullable final Intent intent, final int flags, final int startId) {
vpnService.complete(this);
if (intent == null || intent.getComponent() == null || !intent.getComponent().getPackageName().equals(getPackageName())) {
Log.d(TAG, "Service started by Always-on VPN feature");
Application.getTunnelManager().restoreState(true).whenComplete(ExceptionLoggers.D);
}
return super.onStartCommand(intent, flags, startId);
}
}
}
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