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/*
* Copyright (c) 2012-2023 Arne Schwabe
* Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
*/
package de.blinkt.openvpn.core;
import android.app.job.JobInfo;
import android.app.job.JobParameters;
import android.app.job.JobScheduler;
import android.app.job.JobService;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.net.VpnService;
import android.os.Build;
import android.os.PersistableBundle;
import de.blinkt.openvpn.LaunchVPN;
import de.blinkt.openvpn.VpnProfile;
/**
* This is a task that is run periodically to restart the VPN if tit has died for
* some reason in the background
*/
public class keepVPNAlive extends JobService implements VpnStatus.StateListener {
private ConnectionStatus mLevel = ConnectionStatus.UNKNOWN_LEVEL;
private static final int JOBID_KEEPVPNALIVE = 6231;
@Override
public void onCreate() {
super.onCreate();
VpnStatus.addStateListener(this);
}
@Override
public void onDestroy() {
super.onDestroy();
VpnStatus.removeStateListener(this);
}
@Override
public boolean onStartJob(JobParameters jobParameters) {
if (mLevel == ConnectionStatus.UNKNOWN_LEVEL || mLevel == ConnectionStatus.LEVEL_NOTCONNECTED) {
String vpnUUID = jobParameters.getExtras().getString(LaunchVPN.EXTRA_KEY);
VpnProfile vp = ProfileManager.get(this, vpnUUID);
if (vp == null) {
VpnStatus.logError("Keepalive service cannot find VPN");
unscheduleKeepVPNAliveJobService(this);
return false;
}
VPNLaunchHelper.startOpenVpn(vp, getApplicationContext(), "VPN keep alive Job");
} else {
VpnStatus.logDebug("Keepalive service called but VPN still connected.");
}
/* The job has finished */
return false;
}
@Override
public boolean onStopJob(JobParameters jobParameters) {
/* not doing anything */
return true;
}
@Override
public void updateState(String state, String logmessage,
int localizedResId, ConnectionStatus level, Intent Intent) {
mLevel = level;
}
@Override
public void setConnectedVPN(String uuid) {
}
public static void scheduleKeepVPNAliveJobService(Context c, VpnProfile vp) {
ComponentName keepVPNAliveComponent = new ComponentName(c, keepVPNAlive.class);
JobInfo.Builder jib = new JobInfo.Builder(JOBID_KEEPVPNALIVE, keepVPNAliveComponent);
/* set the VPN that should be restarted if we get killed */
PersistableBundle extraBundle = new PersistableBundle();
extraBundle.putString(de.blinkt.openvpn.LaunchVPN.EXTRA_KEY, vp.getUUIDString());
jib.setExtras(extraBundle);
/* periodic timing */
/* The current limits are 15 minutes and 5 minutes for flex and periodic timer
* but we use a minimum of 5 minutes and 2 minutes to avoid problems if there is some
* strange Android build that allows lower lmits.
*/
long initervalMillis = Math.max(getMinPeriodMillis(), 5 * 60 * 1000L);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
long flexMillis = Math.max(JobInfo.getMinFlexMillis(), 2 * 60 * 1000L);
jib.setPeriodic(initervalMillis, flexMillis);
}
else
{
jib.setPeriodic(initervalMillis);
}
jib.setPersisted(true);
JobScheduler jobScheduler = null;
jobScheduler = getJobScheduler(c);
jobScheduler.schedule(jib.build());
VpnStatus.logDebug("Scheduling VPN keep alive for VPN " + vp.mName);
}
private static JobScheduler getJobScheduler(Context c) {
JobScheduler jobScheduler;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
jobScheduler = c.getSystemService(JobScheduler.class);
} else {
jobScheduler = (JobScheduler) c.getSystemService(JOB_SCHEDULER_SERVICE);
}
return jobScheduler;
}
private static long getMinPeriodMillis() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
return JobInfo.getMinPeriodMillis();
} else {
return 15 * 60 * 1000L; // 15 minutes
}
}
public static void unscheduleKeepVPNAliveJobService(Context c) {
JobScheduler jobScheduler = getJobScheduler(c);
jobScheduler.cancel(JOBID_KEEPVPNALIVE);
VpnStatus.logDebug("Unscheduling VPN keep alive");
}
}
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