/// <summary>
/// This method fires when the Immediate Access service is stopping, before allowing the service to stop
/// this method will first disconnect the managed VPN profiles.
/// </summary>
/// <returns>Task: To allow this method to run asyncronously.</returns>
public static async Task Stop()
{
Logger.Info("Service: Stopping...");
HealthCheckTimer.Enabled = NetEventCoolTimer.Enabled = false;
await VpnControl.Disconnect();
Logger.Info("Service: Stopped.");
}
/// <summary>
/// This method contains the main logic for the Immediate Access service. In a nutshell, this method tests if the probe is available, and if it is not,
/// selects and then connects to a VPN profile.
/// </summary>
/// <returns>Task: to enable threading of this method to allow for canceling.</returns>
private static async Task EnsureConnectionToIntranet()
{
try
{
UpdatePolicy();
if (IsCurrentlyEnsuring || !IsNetworkAvailable || !PolicyReader.IsServiceEnabled())
{
return;
}
EnsuranceCancel = new CancellationTokenSource();
IsCurrentlyEnsuring = true;
if (await TestNetwork.IsProbeAvailable())
{
IsCurrentlyEnsuring = false;
await VpnControl.Disconnect();
return;
}
if (await VpnControl.IsConnected() != null)
{
IsCurrentlyEnsuring = false;
return;
}
EnsuranceCancel.Token.ThrowIfCancellationRequested();
int attempts = (int)PolicyReader.Policies["VpnServerConnectAttempts"];
while (attempts-- > 0)
{
EnsuranceCancel.Token.ThrowIfCancellationRequested();
if (!await TestNetwork.SelectOnlineVpnProfile())
{
IsCurrentlyEnsuring = false;
return;
}
if (await VpnControl.Connect(EnsuranceCancel.Token))
{
IsCurrentlyEnsuring = false;
_ = EnsureConnectionToIntranet();
return;
}
if (attempts > 0)
{
Logger.Warning("Couldn't connect to VPN for some reason. Trying again in 5 seconds...");
await Task.Delay(5000);
}
}
IsCurrentlyEnsuring = false;
}
catch (OperationCanceledException)
{
IsCurrentlyEnsuring = false;
_ = EnsureConnectionToIntranet();
}
}