Table of Contents

Class AndroidDevice

Namespace
VpnHood.Core.Client.Devices.Android
Assembly
VpnHood.Core.Client.Devices.Android.dll

Represents an Android device as the VPN app sees it: the VPN service is the app's own VpnService, in a process of its own in Release builds, which the app starts and reaches through a binder.

public class AndroidDevice : IDevice, IDisposable
Inheritance
AndroidDevice
Implements
Inherited Members

Fields

VpnServiceActionConnect

The action of the intent that connects the VPN service: connect.

public const string VpnServiceActionConnect = "connect"

Field Value

string

VpnServiceJavaName

The VPN service's Java name, as the app reaches it without referencing it (AndroidVpnService): the service's [Service] attribute pins it, as the generated default hashes the namespace and the assembly name, so it is the name the service shipped under.

public const string VpnServiceJavaName = "crc64198439f88d18e1a7.AndroidVpnService"

Field Value

string

VpnServiceProcessName

The suffix of the VPN service's process, in Release builds: :vpnhood_process.

public const string VpnServiceProcessName = ":vpnhood_process"

Field Value

string

Properties

CurrentProcessName

Gets this process's name: Android's word for it from Android 9, else the kernel's copy of it.

public static string CurrentProcessName { get; }

Property Value

string

Exceptions

InvalidOperationException

Android gave this process no name.

IsAlwaysOnSupported

Gets a value indicating whether the app can keep the VPN always on itself, which its always-on setting then turns on, as a desktop's service that starts at boot does; false where the system does it, as on Android, whose setting the app only opens.

public bool IsAlwaysOnSupported { get; }

Property Value

bool

Remarks

Always-on is the system's here.

IsBindProcessToVpnSupported

Gets a value indicating whether BindProcessToVpn(bool) works on the device.

public bool IsBindProcessToVpnSupported { get; }

Property Value

bool

IsExcludeAppsSupported

Gets a value indicating whether the device can keep chosen apps out of the tunnel.

public bool IsExcludeAppsSupported { get; }

Property Value

bool

IsIncludeAppsSupported

Gets a value indicating whether the device can let only chosen apps into the tunnel.

public bool IsIncludeAppsSupported { get; }

Property Value

bool

IsMainProcess

Gets a value indicating whether this process is the app's own: the one named after the package.

public static bool IsMainProcess { get; }

Property Value

bool

Remarks

Every other process — the VPN service's, the tile's, any a library declares — carries a suffix, so a head must not rename its application's process ([Application(Process = ...)]).

Exceptions

InvalidOperationException

The process, or the app's context, has no name.

IsQuicSupported

Gets a value indicating whether the device can make QUIC connections.

public bool IsQuicSupported { get; }

Property Value

bool

IsTv

Gets a value indicating whether the device is a TV.

public bool IsTv { get; }

Property Value

bool

IsVpnServiceProcess

Gets a value indicating whether this process is the VPN service's, by its name (VpnServiceProcessName).

public static bool IsVpnServiceProcess { get; }

Property Value

bool

Exceptions

InvalidOperationException

Android gave this process no name.

IsWaitingForVpnPermission

Gets a value indicating whether RequestVpnService(IUiContext?, TimeSpan, CancellationToken) waits on the OS's prompt for the person's yes, so a UI elsewhere, as a browser driving a TV, can say where the connection waits.

public bool IsWaitingForVpnPermission { get; }

Property Value

bool

KillSwitch

Gets the kill switch's block, where the device has one, as a desktop's service; otherwise, null. The device holds it, as it outlives each connection's VPN service, whose host controls the same block through a controller of its own.

public IVpnKillSwitch? KillSwitch { get; }

Property Value

IVpnKillSwitch

Remarks

None: the kill switch is the system's, its "Block connections without VPN".

MemInfo

Gets the device's memory as the platform reports it now, or null where it is not known; a desktop's comes from the .NET garbage collector's view.

public DeviceMemInfo? MemInfo { get; }

Property Value

DeviceMemInfo

Remarks

Android's own figures, from its activity manager.

OsInfo

Gets a description of the device and its OS, as Google: Pixel 8, Android: 16.

public string OsInfo { get; }

Property Value

string

UserAgentInfo

Gets the parts of a browser's user agent on the device, which the app builds its own from.

public DeviceUserAgentInfo UserAgentInfo { get; }

Property Value

DeviceUserAgentInfo

Remarks

As Chrome says it: Android's release and the model, and "Mobile" on a phone.

VpnServiceConfigFolder

Gets the folder of the VPN service's own files: its options, status and log, and the split filters the app publishes for it, meant to stay on this device, out of backups and transfers to a new device.

public string VpnServiceConfigFolder { get; }

Property Value

string

Remarks

Where the device can, the folder is kept out of the OS's backups: Android's is its folder outside them, and on iOS a failure to exclude it is only logged. A desktop's is an ordinary folder.

Exceptions

InvalidOperationException

Android gives no folder outside its backups.

VpnServiceDataFolder

Gets the folder of what the app and the VPN service share that is the person's own, as the proxies they added, meant to travel with a backup where the OS backs it up; tvOS keeps it among its caches.

public string VpnServiceDataFolder { get; }

Property Value

string

Remarks

It is GetVpnServiceDataFolder()'s.

Methods

BindProcessToVpn(bool)

Binds the app's own connections to the system's default network, which is the VPN while one is connected, or, with false, to a network outside the VPN: on Android, the first of Ethernet, Wi-Fi, USB, satellite, Bluetooth and cellular.

public void BindProcessToVpn(bool value)

Parameters

value bool

true for the system's default network; false for a network outside the VPN.

Exceptions

NotSupportedException

The device does not support it (IsBindProcessToVpnSupported).

Exception

Android found no network outside the VPN.

Create()

Creates the device, in any process but the VPN service's, as the app's or the tile's.

public static AndroidDevice Create()

Returns

AndroidDevice

The device.

Exceptions

InvalidOperationException

This is the VPN service's process, Android gave this process no name, or it named no cache folder for the app.

CreateMessageClient()

Creates a client of the VPN service's messages, through which the app commands it.

public IMessageClient CreateMessageClient()

Returns

IMessageClient

The client.

Remarks

It is a binder client, with a dormant binding to the VPN service.

Dispose()

Does nothing: Android owns the VPN service's lifetime.

public void Dispose()

GetInstalledApps(CancellationToken)

Gets the installed apps a split by app can pick from, each with its name and icon.

public Task<IReadOnlyList<DeviceAppInfo>> GetInstalledApps(CancellationToken cancellationToken)

Parameters

cancellationToken CancellationToken

The token to monitor for cancellation requests.

Returns

Task<IReadOnlyList<DeviceAppInfo>>

A task whose result is the apps: on Android, by name; a Windows debug build gives test entries.

Exceptions

NotSupportedException

The device cannot split by app.

InvalidOperationException

Android's package manager or an app's resources are not available.

Exception

Android could not encode an app's icon.

OperationCanceledException

cancellationToken was canceled.

GetVpnServiceConfigFolder()

Gets the folder of the VPN service's own files: vpn-service in the app's no-backup folder, which Android never puts in a backup or a transfer.

public static string GetVpnServiceConfigFolder()

Returns

string

The folder's path.

Exceptions

InvalidOperationException

Android names no no-backup folder for the app.

GetVpnServiceDataFolder()

Gets the folder of the person's proxies: vpn-service beside the app's files, which travel with a backup.

public static string GetVpnServiceDataFolder()

Returns

string

The folder's path.

RequestVpnService(IUiContext?, TimeSpan, CancellationToken)

Prepares the device to run the app's VPN service: on Android, it asks for the person's consent with the OS's prompt where the OS requires it now; on the Windows VPN plug-in, it prepares the VPN profile; elsewhere it may do nothing, as iOS configures the VPN when it starts.

public Task RequestVpnService(IUiContext? uiContext, TimeSpan timeout, CancellationToken cancellationToken)

Parameters

uiContext IUiContext

The UI to show a prompt in, or null; on Android, one given must be Android's own, and one is needed where the OS must ask.

timeout TimeSpan

How long to wait for the person's answer, where the device waits for one, as Android does.

cancellationToken CancellationToken

The token to monitor for cancellation requests.

Returns

Task

A task that completes once the device is prepared.

Exceptions

UserCanceledException

The person refused, on Android.

Exception

Android must ask, and no UI was given.

InvalidCastException

The UI given is not Android's own, on Android.

ArgumentOutOfRangeException

timeout is negative, other than -1 ms, or too long, on Android.

TimeoutException

The person did not answer in time, or the wait was canceled, on Android; or the Windows VPN plug-in's profile did not disconnect in time.

InvalidOperationException

The Windows VPN plug-in's profile could not be prepared.

OperationCanceledException

cancellationToken was canceled.

StartVpnService(CancellationToken)

Starts the VPN service, which then connects as its options in the config folder say. The task completes once the start is under way, not when the VPN is up; the app's service manager waits for that.

public Task StartVpnService(CancellationToken cancellationToken)

Parameters

cancellationToken CancellationToken

The token to monitor for cancellation requests.

Returns

Task

A task that represents the asynchronous operation.

Remarks

iOS fails it with an NSErrorException of its own.

Exceptions

VpnServiceException

Android could not start the service.

InvalidOperationException

A desktop's VPN host or the Windows VPN plug-in's profile is missing or failed.

ObjectDisposedException

A desktop's VPN host process was disposed.

TimeoutException

The Windows VPN plug-in did not start in time.

Win32Exception

Windows refused the VPN host's process.

OperationCanceledException

cancellationToken was canceled.