Draft for supporting using system configuration for temporary hotspot

Attempt at addressing #166.

README.md

@@ -302,6 +302,7 @@ Greylisted/blacklisted APIs or internal constants: (some constants are hardcoded
 * (since API 28) `Landroid/net/wifi/WifiManager;->registerSoftApCallback(Ljava/util/concurrent/Executor;Landroid/net/wifi/WifiManager$SoftApCallback;)V,sdk,system-api,test-api`
 * (since API 30) `Landroid/net/wifi/WifiManager;->setSoftApConfiguration(Landroid/net/wifi/SoftApConfiguration;)Z,sdk,system-api,test-api`
 * (prior to API 30) `Landroid/net/wifi/WifiManager;->setWifiApConfiguration(Landroid/net/wifi/WifiConfiguration;)Z,sdk,system-api,test-api`
+* (since API 30) `Landroid/net/wifi/WifiManager;->startLocalOnlyHotspot(Landroid/net/wifi/SoftApConfiguration;Ljava/util/concurrent/Executor;Landroid/net/wifi/WifiManager$LocalOnlyHotspotCallback;)V,sdk,system-api,test-api`
 * (since API 28) `Landroid/net/wifi/WifiManager;->unregisterSoftApCallback(Landroid/net/wifi/WifiManager$SoftApCallback;)V,sdk,system-api,test-api`
 * `Landroid/net/wifi/p2p/WifiP2pGroupList;->getGroupList()Ljava/util/List;,sdk,system-api,test-api`
 * `Landroid/net/wifi/p2p/WifiP2pManager$PersistentGroupInfoListener;->onPersistentGroupInfoAvailable(Landroid/net/wifi/p2p/WifiP2pGroupList;)V,sdk,system-api,test-api`

mobile/src/main/java/be/mygod/vpnhotspot/LocalOnlyHotspotService.kt

@@ -5,14 +5,20 @@ import android.content.IntentFilter
 import android.net.wifi.WifiManager
 import android.os.Build
 import androidx.annotation.RequiresApi
+import be.mygod.librootkotlinx.RootServer
+import be.mygod.vpnhotspot.App.Companion.app
 import be.mygod.vpnhotspot.net.IpNeighbour
 import be.mygod.vpnhotspot.net.TetherType
 import be.mygod.vpnhotspot.net.TetheringManager
 import be.mygod.vpnhotspot.net.TetheringManager.localOnlyTetheredIfaces
 import be.mygod.vpnhotspot.net.monitor.IpNeighbourMonitor
 import be.mygod.vpnhotspot.net.monitor.TetherTimeoutMonitor
+import be.mygod.vpnhotspot.net.wifi.SoftApConfigurationCompat
 import be.mygod.vpnhotspot.net.wifi.SoftApConfigurationCompat.Companion.toCompat
 import be.mygod.vpnhotspot.net.wifi.WifiApManager
+import be.mygod.vpnhotspot.root.LocalOnlyHotspotCallbacks
+import be.mygod.vpnhotspot.root.RootManager
+import be.mygod.vpnhotspot.root.WifiApCommands
 import be.mygod.vpnhotspot.util.Services
 import be.mygod.vpnhotspot.util.StickyEvent1
 import be.mygod.vpnhotspot.util.broadcastReceiver
@@ -23,6 +29,10 @@ import java.net.Inet4Address
 
 @RequiresApi(26)
 class LocalOnlyHotspotService : IpNeighbourMonitoringService(), CoroutineScope {
+    companion object {
+        const val KEY_USE_SYSTEM = "service.tempHotspot.useSystem"
+    }
+
     inner class Binder : android.os.Binder() {
         /**
          * null represents IDLE, "" represents CONNECTING, "something" represents CONNECTED.
@@ -33,10 +43,7 @@ class LocalOnlyHotspotService : IpNeighbourMonitoringService(), CoroutineScope {
                 ifaceChanged(value)
             }
         val ifaceChanged = StickyEvent1 { iface }
-
+        val configuration get() = reservation?.configuration
-        val configuration get() = if (Build.VERSION.SDK_INT < 30) @Suppress("DEPRECATION") {
-            reservation?.wifiConfiguration?.toCompat()
-        } else reservation?.softApConfiguration?.toCompat()
 
         fun stop() {
             when (iface) {
@@ -47,8 +54,65 @@ class LocalOnlyHotspotService : IpNeighbourMonitoringService(), CoroutineScope {
         }
     }
 
+    interface Reservation : AutoCloseable {
+        val configuration: SoftApConfigurationCompat?
+    }
+    class Framework(private val reservation: WifiManager.LocalOnlyHotspotReservation) : Reservation {
+        override val configuration get() = if (Build.VERSION.SDK_INT < 30) @Suppress("DEPRECATION") {
+            reservation.wifiConfiguration?.toCompat()
+        } else reservation.softApConfiguration.toCompat()
+        override fun close() = reservation.close()
+    }
+    @RequiresApi(30)
+    inner class Root(rootServer: RootServer) : Reservation {
+        private val channel = rootServer.create(WifiApCommands.StartLocalOnlyHotspot(), this@LocalOnlyHotspotService)
+        override var configuration: SoftApConfigurationCompat? = null
+            private set
+        override fun close() = channel.cancel()
+
+        suspend fun work() {
+            for (callback in channel) when (callback) {
+                is LocalOnlyHotspotCallbacks.OnStarted -> configuration = callback.config.toCompat()
+                is LocalOnlyHotspotCallbacks.OnStopped -> reservation = null
+                is LocalOnlyHotspotCallbacks.OnFailed -> onFrameworkFailed(callback.reason)
+            }
+        }
+    }
+
     private val binder = Binder()
-    private var reservation: WifiManager.LocalOnlyHotspotReservation? = null
+    private var reservation: Reservation? = null
+        set(value) {
+            field = value
+            if (value != null && !receiverRegistered) {
+                val configuration = binder.configuration
+                if (Build.VERSION.SDK_INT < 30 && configuration!!.isAutoShutdownEnabled) {
+                    timeoutMonitor = TetherTimeoutMonitor(configuration.shutdownTimeoutMillis, coroutineContext) {
+                        value.close()
+                    }
+                }
+                registerReceiver(receiver, IntentFilter(TetheringManager.ACTION_TETHER_STATE_CHANGED))
+                receiverRegistered = true
+            }
+        }
+    private fun onFrameworkFailed(reason: Int) {
+        SmartSnackbar.make(getString(R.string.tethering_temp_hotspot_failure, when (reason) {
+            WifiManager.LocalOnlyHotspotCallback.ERROR_NO_CHANNEL -> {
+                getString(R.string.tethering_temp_hotspot_failure_no_channel)
+            }
+            WifiManager.LocalOnlyHotspotCallback.ERROR_GENERIC -> {
+                getString(R.string.tethering_temp_hotspot_failure_generic)
+            }
+            WifiManager.LocalOnlyHotspotCallback.ERROR_INCOMPATIBLE_MODE -> {
+                getString(R.string.tethering_temp_hotspot_failure_incompatible_mode)
+            }
+            WifiManager.LocalOnlyHotspotCallback.ERROR_TETHERING_DISALLOWED -> {
+                getString(R.string.tethering_temp_hotspot_failure_tethering_disallowed)
+            }
+            else -> getString(R.string.failure_reason_unknown, reason)
+        })).show()
+        stopService()
+    }
+
     /**
      * Writes and critical reads to routingManager should be protected with this context.
      */
@@ -82,40 +146,35 @@ class LocalOnlyHotspotService : IpNeighbourMonitoringService(), CoroutineScope {
         if (binder.iface != null) return START_STICKY
         binder.iface = ""
         updateNotification()    // show invisible foreground notification to avoid being killed
+        launch(start = CoroutineStart.UNDISPATCHED) { doStart() }
+        return START_STICKY
+    }
+    private suspend fun doStart() {
+        if (Build.VERSION.SDK_INT >= 30 && app.pref.getBoolean(KEY_USE_SYSTEM, false)) try {
+            RootManager.use {
+                Root(it).apply {
+                    reservation = this
+                    work()
+                }
+            }
+            return
+        } catch (_: CancellationException) {
+            return
+        } catch (e: Exception) {
+            Timber.w(e)
+            SmartSnackbar.make(e).show()
+        }
         try {
             Services.wifi.startLocalOnlyHotspot(object : WifiManager.LocalOnlyHotspotCallback() {
                 override fun onStarted(reservation: WifiManager.LocalOnlyHotspotReservation?) {
                     if (reservation == null) onFailed(-2) else {
-                        this@LocalOnlyHotspotService.reservation = reservation
+                        this@LocalOnlyHotspotService.reservation = Framework(reservation)
-                        if (!receiverRegistered) {
-                            val configuration = binder.configuration!!
-                            if (Build.VERSION.SDK_INT < 30 && configuration.isAutoShutdownEnabled) {
-                                timeoutMonitor = TetherTimeoutMonitor(configuration.shutdownTimeoutMillis,
-                                        coroutineContext) { reservation.close() }
-                            }
-                            registerReceiver(receiver, IntentFilter(TetheringManager.ACTION_TETHER_STATE_CHANGED))
-                            receiverRegistered = true
                     }
                 }
-                }
-
                 override fun onStopped() {
-                    Timber.d("LOHCallback.onStopped")
                     reservation = null
                 }
-
+                override fun onFailed(reason: Int) = onFrameworkFailed(reason)
-                override fun onFailed(reason: Int) {
-                    SmartSnackbar.make(getString(R.string.tethering_temp_hotspot_failure, when (reason) {
-                        ERROR_NO_CHANNEL -> getString(R.string.tethering_temp_hotspot_failure_no_channel)
-                        ERROR_GENERIC -> getString(R.string.tethering_temp_hotspot_failure_generic)
-                        ERROR_INCOMPATIBLE_MODE -> getString(R.string.tethering_temp_hotspot_failure_incompatible_mode)
-                        ERROR_TETHERING_DISALLOWED -> {
-                            getString(R.string.tethering_temp_hotspot_failure_tethering_disallowed)
-                        }
-                        else -> getString(R.string.failure_reason_unknown, reason)
-                    })).show()
-                    stopService()
-                }
             }, null)
         } catch (e: IllegalStateException) {
             // throws IllegalStateException if the caller attempts to start the LocalOnlyHotspot while they
@@ -128,7 +187,6 @@ class LocalOnlyHotspotService : IpNeighbourMonitoringService(), CoroutineScope {
             SmartSnackbar.make(e).show()
             stopService()
         }
-        return START_STICKY
     }
 
     override fun onIpNeighbourAvailable(neighbours: Collection<IpNeighbour>) {

mobile/src/main/java/be/mygod/vpnhotspot/SettingsPreferenceFragment.kt

@@ -1,5 +1,6 @@
 package be.mygod.vpnhotspot
 
+import android.annotation.TargetApi
 import android.content.Intent
 import android.os.Build
 import android.os.Bundle
@@ -38,6 +39,8 @@ import java.io.PrintWriter
 import kotlin.system.exitProcess
 
 class SettingsPreferenceFragment : PreferenceFragmentCompat() {
+    private fun Preference.remove() = parent!!.removePreference(this)
+    @TargetApi(26)
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
         // handle complicated default value and possible system upgrades
         WifiDoubleLock.mode = WifiDoubleLock.mode
@@ -65,7 +68,7 @@ class SettingsPreferenceFragment : PreferenceFragmentCompat() {
                     }
                     false
                 }
-            } else parent!!.removePreference(this)
+            } else remove()
         }
         val boot = findPreference<SwitchPreference>("service.repeater.startOnBoot")!!
         if (Services.p2p != null) {
@@ -74,11 +77,12 @@ class SettingsPreferenceFragment : PreferenceFragmentCompat() {
                 true
             }
             boot.isChecked = BootReceiver.enabled
-        } else boot.parent!!.removePreference(boot)
+        } else boot.remove()
         if (Services.p2p == null || !RepeaterService.safeModeConfigurable) {
             val safeMode = findPreference<Preference>(RepeaterService.KEY_SAFE_MODE)!!
-            safeMode.parent!!.removePreference(safeMode)
+            safeMode.remove()
         }
+        if (Build.VERSION.SDK_INT < 30) findPreference<Preference>(LocalOnlyHotspotService.KEY_USE_SYSTEM)!!.remove()
         findPreference<Preference>("service.clean")!!.setOnPreferenceClickListener {
             GlobalScope.launch { RoutingManager.clean() }
             true

mobile/src/main/java/be/mygod/vpnhotspot/manage/TetheringFragment.kt

@@ -191,7 +191,7 @@ class TetheringFragment : Fragment(), ServiceConnection, Toolbar.OnMenuItemClick
                 apConfigurationRunning = true
                 viewLifecycleOwner.lifecycleScope.launchWhenCreated {
                     try {
-                        WifiApManager.configuration
+                        WifiApManager.configurationCompat
                     } catch (e: InvocationTargetException) {
                         if (e.targetException !is SecurityException) Timber.w(e)
                         try {
@@ -237,7 +237,7 @@ class TetheringFragment : Fragment(), ServiceConnection, Toolbar.OnMenuItemClick
                     SmartSnackbar.make(e).show()
                 }
                 val success = try {
-                    WifiApManager.setConfiguration(configuration)
+                    WifiApManager.setConfigurationCompat(configuration)
                 } catch (e: InvocationTargetException) {
                     try {
                         RootManager.use { it.execute(WifiApCommands.SetConfiguration(configuration)) }

mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApManager.kt

@@ -72,16 +72,20 @@ object WifiApManager {
         WifiManager::class.java.getDeclaredMethod("setSoftApConfiguration", SoftApConfiguration::class.java)
     }
 
+    @get:RequiresApi(30)
+    val configuration get() = getSoftApConfiguration(Services.wifi) as SoftApConfiguration
     /**
      * Requires NETWORK_SETTINGS permission (or root) on API 30+, and OVERRIDE_WIFI_CONFIG on API 29-.
      */
-    val configuration get() = if (Build.VERSION.SDK_INT < 30) @Suppress("DEPRECATION") {
+    val configurationCompat get() = if (Build.VERSION.SDK_INT < 30) @Suppress("DEPRECATION") {
         (getWifiApConfiguration(Services.wifi) as android.net.wifi.WifiConfiguration?)?.toCompat()
                 ?: SoftApConfigurationCompat()
-    } else (getSoftApConfiguration(Services.wifi) as SoftApConfiguration).toCompat()
+    } else configuration.toCompat()
-    fun setConfiguration(value: SoftApConfigurationCompat) = (if (Build.VERSION.SDK_INT < 30) @Suppress("DEPRECATION") {
+    fun setConfigurationCompat(value: SoftApConfigurationCompat) = (if (Build.VERSION.SDK_INT >= 30) {
+        setSoftApConfiguration(Services.wifi, value.toPlatform())
+    } else @Suppress("DEPRECATION") {
         setWifiApConfiguration(Services.wifi, value.toWifiConfiguration())
-    } else setSoftApConfiguration(Services.wifi, value.toPlatform())) as Boolean
+    }) as Boolean
 
     @RequiresApi(28)
     interface SoftApCallbackCompat {
@@ -236,6 +240,16 @@ object WifiApManager {
     @RequiresApi(28)
     fun unregisterSoftApCallback(key: Any) = unregisterSoftApCallback(Services.wifi, key)
 
+    @get:RequiresApi(30)
+    private val startLocalOnlyHotspot by lazy @TargetApi(30) {
+        WifiManager::class.java.getDeclaredMethod("startLocalOnlyHotspot", SoftApConfiguration::class.java,
+            Executor::class.java, WifiManager.LocalOnlyHotspotCallback::class.java)
+    }
+    @RequiresApi(30)
+    fun startLocalOnlyHotspot(config: SoftApConfiguration, callback: WifiManager.LocalOnlyHotspotCallback?,
+                              executor: Executor? = null) =
+        startLocalOnlyHotspot(Services.wifi, config, executor, callback)
+
     private val cancelLocalOnlyHotspotRequest by lazy {
         WifiManager::class.java.getDeclaredMethod("cancelLocalOnlyHotspotRequest")
     }

mobile/src/main/java/be/mygod/vpnhotspot/root/LocalOnlyHotspotCallbacks.kt

@@ -0,0 +1,19 @@
+package be.mygod.vpnhotspot.root
+
+import android.net.wifi.SoftApConfiguration
+import android.os.Parcelable
+import androidx.annotation.RequiresApi
+import kotlinx.parcelize.Parcelize
+
+@RequiresApi(30)
+sealed class LocalOnlyHotspotCallbacks : Parcelable {
+    @Parcelize
+    data class OnStarted(val config: SoftApConfiguration) : LocalOnlyHotspotCallbacks()
+    @Parcelize
+    class OnStopped : LocalOnlyHotspotCallbacks() {
+        override fun equals(other: Any?) = other is OnStopped
+        override fun hashCode() = 0x80acd3ca.toInt()
+    }
+    @Parcelize
+    data class OnFailed(val reason: Int) : LocalOnlyHotspotCallbacks()
+}

mobile/src/main/java/be/mygod/vpnhotspot/root/WifiApCommands.kt

@@ -1,5 +1,6 @@
 package be.mygod.vpnhotspot.root
 
+import android.net.wifi.WifiManager
 import android.os.Parcelable
 import androidx.annotation.RequiresApi
 import be.mygod.librootkotlinx.ParcelableBoolean
@@ -62,6 +63,7 @@ object WifiApCommands {
                 private fun push(parcel: SoftApCallbackParcel) {
                     trySend(parcel).onClosed {
                         finish.completeExceptionally(it ?: ClosedSendChannelException("Channel was closed normally"))
+                        return
                     }.onFailure { throw it!! }
                 }
 
@@ -149,11 +151,60 @@ object WifiApCommands {
 
     @Parcelize
     class GetConfiguration : RootCommand<SoftApConfigurationCompat> {
-        override suspend fun execute() = WifiApManager.configuration
+        override suspend fun execute() = WifiApManager.configurationCompat
     }
 
     @Parcelize
     data class SetConfiguration(val configuration: SoftApConfigurationCompat) : RootCommand<ParcelableBoolean> {
-        override suspend fun execute() = ParcelableBoolean(WifiApManager.setConfiguration(configuration))
+        override suspend fun execute() = ParcelableBoolean(WifiApManager.setConfigurationCompat(configuration))
+    }
+
+    @Parcelize
+    @RequiresApi(30)
+    class StartLocalOnlyHotspot : RootCommandChannel<LocalOnlyHotspotCallbacks> {
+        override fun create(scope: CoroutineScope) = scope.produce(capacity = capacity) {
+            val finish = CompletableDeferred<Unit>()
+            var lohr: WifiManager.LocalOnlyHotspotReservation? = null
+            WifiApManager.startLocalOnlyHotspot(WifiApManager.configuration, object :
+                WifiManager.LocalOnlyHotspotCallback() {
+                private fun push(parcel: LocalOnlyHotspotCallbacks) {
+                    trySend(parcel).onClosed {
+                        finish.completeExceptionally(it ?: ClosedSendChannelException("Channel was closed normally"))
+                        return
+                    }.onFailure { throw it!! }
+                }
+                override fun onStarted(reservation: WifiManager.LocalOnlyHotspotReservation?) {
+                    if (reservation == null) onFailed(-3) else {
+                        require(lohr == null)
+                        lohr = reservation
+                        push(LocalOnlyHotspotCallbacks.OnStarted(reservation.softApConfiguration))
+                    }
+                }
+                override fun onStopped() {
+                    push(LocalOnlyHotspotCallbacks.OnStopped())
+                    finish.complete(Unit)
+                }
+                override fun onFailed(reason: Int) {
+                    push(LocalOnlyHotspotCallbacks.OnFailed(reason))
+                    finish.complete(Unit)
+                }
+            }) {
+                scope.launch {
+                    try {
+                        it.run()
+                    } catch (e: Throwable) {
+                        finish.completeExceptionally(e)
+                    }
+                }
+            }
+            try {
+                finish.await()
+            } catch (e: Exception) {
+                WifiApManager.cancelLocalOnlyHotspotRequest()
+                throw e
+            } finally {
+                lohr?.close()
+            }
+        }
     }
 }

mobile/src/main/res/drawable/ic_content_file_copy.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="?attr/colorControlNormal" android:viewportHeight="24"
+    android:viewportWidth="24" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="@android:color/white" android:pathData="M16,1L4,1c-1.1,0 -2,0.9 -2,2v14h2L4,3h12L16,1zM15,5l6,6v10c0,1.1 -0.9,2 -2,2L7.99,23C6.89,23 6,22.1 6,21l0.01,-14c0,-1.1 0.89,-2 1.99,-2h7zM14,12h5.5L14,6.5L14,12z"/>
+</vector>

mobile/src/main/res/values-zh-rCN/strings.xml

@@ -113,6 +113,8 @@
     <string name="settings_service_repeater_safe_mode">中继安全模式</string>
     <string name="settings_service_repeater_safe_mode_summary">不对系统配置进行修改，但是可能须要较长的网络名称。</string>
     <string name="settings_service_repeater_safe_mode_warning">使用短名称可能需要关闭安全模式。</string>
+    <string name="settings_service_temp_hotspot_use_system">临时 WLAN 热点使用系统配置</string>
+    <string name="settings_service_temp_hotspot_use_system_summary">这将与其他使用本地热点的应用冲突</string>
     <string name="settings_service_wifi_lock">保持 Wi\u2011Fi 开启</string>
     <string name="settings_service_wifi_lock_none">系统默认</string>
     <string name="settings_service_wifi_lock_full">开</string>

mobile/src/main/res/values/strings.xml

@@ -131,6 +131,9 @@
         not work with short network names.</string>
     <string name="settings_service_repeater_safe_mode_warning">Short network names might require turning off safe
         mode.</string>
+    <string name="settings_service_temp_hotspot_use_system">Use system configuration for temporary hotspot</string>
+    <string name="settings_service_temp_hotspot_use_system_summary">Will conflict with other apps using local only
+        hotspot</string>
     <string name="settings_service_wifi_lock">Keep Wi\u2011Fi alive</string>
     <string name="settings_service_wifi_lock_none">System default</string>
     <string name="settings_service_wifi_lock_full">On</string>

mobile/src/main/res/xml/pref_settings.xml

@@ -68,6 +68,11 @@
             app:title="@string/settings_service_repeater_safe_mode"
             app:summary="@string/settings_service_repeater_safe_mode_summary"
             app:defaultValue="true"/>
+        <SwitchPreference
+            app:key="service.tempHotspot.useSystem"
+            app:icon="@drawable/ic_content_file_copy"
+            app:title="@string/settings_service_temp_hotspot_use_system"
+            app:summary="@string/settings_service_temp_hotspot_use_system_summary"/>
         <com.takisoft.preferencex.SimpleMenuPreference
             app:key="service.ipMonitor"
             app:icon="@drawable/ic_hardware_device_hub"