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/*
* Copyright © 2017-2019 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.android.model
import android.annotation.SuppressLint
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.os.Build
import androidx.databinding.BaseObservable
import androidx.databinding.Bindable
import com.wireguard.android.Application.Companion.get
import com.wireguard.android.Application.Companion.getAsyncWorker
import com.wireguard.android.Application.Companion.getBackend
import com.wireguard.android.Application.Companion.getSharedPreferences
import com.wireguard.android.Application.Companion.getTunnelManager
import com.wireguard.android.BR
import com.wireguard.android.R
import com.wireguard.android.backend.Statistics
import com.wireguard.android.backend.Tunnel
import com.wireguard.android.configStore.ConfigStore
import com.wireguard.android.databinding.ObservableSortedKeyedArrayList
import com.wireguard.android.util.ExceptionLoggers
import com.wireguard.config.Config
import java9.util.concurrent.CompletableFuture
import java9.util.concurrent.CompletionStage
import java.util.ArrayList
/**
* Maintains and mediates changes to the set of available WireGuard tunnels,
*/
class TunnelManager(private val configStore: ConfigStore) : BaseObservable() {
val tunnels = CompletableFuture<ObservableSortedKeyedArrayList<String, ObservableTunnel>>()
private val context: Context = get()
private val delayedLoadRestoreTunnels = ArrayList<CompletableFuture<Void>>()
private val tunnelMap: ObservableSortedKeyedArrayList<String, ObservableTunnel> = ObservableSortedKeyedArrayList(TunnelComparator)
private var haveLoaded = false
private fun addToList(name: String, config: Config?, state: Tunnel.State): ObservableTunnel? {
val tunnel = ObservableTunnel(this, name, config, state)
tunnelMap.add(tunnel)
return tunnel
}
fun create(name: String, config: Config?): CompletionStage<ObservableTunnel> {
if (Tunnel.isNameInvalid(name))
return CompletableFuture.failedFuture(IllegalArgumentException(context.getString(R.string.tunnel_error_invalid_name)))
if (tunnelMap.containsKey(name))
return CompletableFuture.failedFuture(IllegalArgumentException(context.getString(R.string.tunnel_error_already_exists, name)))
return getAsyncWorker().supplyAsync { configStore.create(name, config!!) }.thenApply { addToList(name, it, Tunnel.State.DOWN) }
}
fun delete(tunnel: ObservableTunnel): CompletionStage<Void> {
val originalState = tunnel.state
val wasLastUsed = tunnel == lastUsedTunnel
// Make sure nothing touches the tunnel.
if (wasLastUsed)
lastUsedTunnel = null
tunnelMap.remove(tunnel)
return getAsyncWorker().runAsync {
if (originalState == Tunnel.State.UP)
getBackend().setState(tunnel, Tunnel.State.DOWN, null)
try {
configStore.delete(tunnel.name)
} catch (e: Exception) {
if (originalState == Tunnel.State.UP)
getBackend().setState(tunnel, Tunnel.State.UP, tunnel.config)
throw e
}
}.whenComplete { _, e ->
if (e == null)
return@whenComplete
// Failure, put the tunnel back.
tunnelMap.add(tunnel)
if (wasLastUsed)
lastUsedTunnel = tunnel
}
}
@get:Bindable
@SuppressLint("ApplySharedPref")
var lastUsedTunnel: ObservableTunnel? = null
private set(value) {
if (value == field) return
field = value
notifyPropertyChanged(BR.lastUsedTunnel)
if (value != null)
getSharedPreferences().edit().putString(KEY_LAST_USED_TUNNEL, value.name).commit()
else
getSharedPreferences().edit().remove(KEY_LAST_USED_TUNNEL).commit()
}
fun getTunnelConfig(tunnel: ObservableTunnel): CompletionStage<Config> = getAsyncWorker()
.supplyAsync { configStore.load(tunnel.name) }.thenApply(tunnel::onConfigChanged)
fun onCreate() {
getAsyncWorker().supplyAsync { configStore.enumerate() }
.thenAcceptBoth(getAsyncWorker().supplyAsync { getBackend().runningTunnelNames }, this::onTunnelsLoaded)
.whenComplete(ExceptionLoggers.E)
}
private fun onTunnelsLoaded(present: Iterable<String>, running: Collection<String>) {
for (name in present)
addToList(name, null, if (running.contains(name)) Tunnel.State.UP else Tunnel.State.DOWN)
val lastUsedName = getSharedPreferences().getString(KEY_LAST_USED_TUNNEL, null)
if (lastUsedName != null)
lastUsedTunnel = tunnelMap[lastUsedName]
var toComplete: Array<CompletableFuture<Void>>
synchronized(delayedLoadRestoreTunnels) {
haveLoaded = true
toComplete = delayedLoadRestoreTunnels.toTypedArray()
delayedLoadRestoreTunnels.clear()
}
restoreState(true).whenComplete { v: Void?, t: Throwable? ->
for (f in toComplete) {
if (t == null)
f.complete(v)
else
f.completeExceptionally(t)
}
}
tunnels.complete(tunnelMap)
}
fun refreshTunnelStates() {
getAsyncWorker().supplyAsync { getBackend().runningTunnelNames }
.thenAccept { running: Set<String> -> for (tunnel in tunnelMap) tunnel.onStateChanged(if (running.contains(tunnel.name)) Tunnel.State.UP else Tunnel.State.DOWN) }
.whenComplete(ExceptionLoggers.E)
}
fun restoreState(force: Boolean): CompletionStage<Void> {
if (!force && !getSharedPreferences().getBoolean(KEY_RESTORE_ON_BOOT, false))
return CompletableFuture.completedFuture(null)
synchronized(delayedLoadRestoreTunnels) {
if (!haveLoaded) {
val f = CompletableFuture<Void>()
delayedLoadRestoreTunnels.add(f)
return f
}
}
val previouslyRunning = getSharedPreferences().getStringSet(KEY_RUNNING_TUNNELS, null)
?: return CompletableFuture.completedFuture(null)
return CompletableFuture.allOf(*tunnelMap.filter { previouslyRunning.contains(it.name) }.map { setTunnelState(it, Tunnel.State.UP).toCompletableFuture() }.toTypedArray())
}
@SuppressLint("ApplySharedPref")
fun saveState() {
getSharedPreferences().edit().putStringSet(KEY_RUNNING_TUNNELS, tunnelMap.filter { it.state == Tunnel.State.UP }.map { it.name }.toSet()).commit()
}
fun setTunnelConfig(tunnel: ObservableTunnel, config: Config): CompletionStage<Config> = getAsyncWorker().supplyAsync {
getBackend().setState(tunnel, tunnel.state, config)
configStore.save(tunnel.name, config)
}.thenApply { tunnel.onConfigChanged(it) }
fun setTunnelName(tunnel: ObservableTunnel, name: String): CompletionStage<String> {
if (Tunnel.isNameInvalid(name))
return CompletableFuture.failedFuture(IllegalArgumentException(context.getString(R.string.tunnel_error_invalid_name)))
if (tunnelMap.containsKey(name)) {
return CompletableFuture.failedFuture(IllegalArgumentException(context.getString(R.string.tunnel_error_already_exists, name)))
}
val originalState = tunnel.state
val wasLastUsed = tunnel == lastUsedTunnel
// Make sure nothing touches the tunnel.
if (wasLastUsed)
lastUsedTunnel = null
tunnelMap.remove(tunnel)
return getAsyncWorker().supplyAsync {
if (originalState == Tunnel.State.UP)
getBackend().setState(tunnel, Tunnel.State.DOWN, null)
configStore.rename(tunnel.name, name)
val newName = tunnel.onNameChanged(name)
if (originalState == Tunnel.State.UP)
getBackend().setState(tunnel, Tunnel.State.UP, tunnel.config)
newName
}.whenComplete { _, e ->
// On failure, we don't know what state the tunnel might be in. Fix that.
if (e != null)
getTunnelState(tunnel)
// Add the tunnel back to the manager, under whatever name it thinks it has.
tunnelMap.add(tunnel)
if (wasLastUsed)
lastUsedTunnel = tunnel
}
}
fun setTunnelState(tunnel: ObservableTunnel, state: Tunnel.State): CompletionStage<Tunnel.State> = tunnel.configAsync
.thenCompose { getAsyncWorker().supplyAsync { getBackend().setState(tunnel, state, it) } }
.whenComplete { newState, e ->
// Ensure onStateChanged is always called (failure or not), and with the correct state.
tunnel.onStateChanged(if (e == null) newState else tunnel.state)
if (e == null && newState == Tunnel.State.UP)
lastUsedTunnel = tunnel
saveState()
}
class IntentReceiver : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent?) {
val manager = getTunnelManager()
if (intent == null) return
val action = intent.action ?: return
if ("com.wireguard.android.action.REFRESH_TUNNEL_STATES" == action) {
manager.refreshTunnelStates()
return
}
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M || !getSharedPreferences().getBoolean("allow_remote_control_intents", false))
return
val state: Tunnel.State
state = when (action) {
"com.wireguard.android.action.SET_TUNNEL_UP" -> Tunnel.State.UP
"com.wireguard.android.action.SET_TUNNEL_DOWN" -> Tunnel.State.DOWN
else -> return
}
val tunnelName = intent.getStringExtra("tunnel") ?: return
manager.tunnels.thenAccept {
val tunnel = it[tunnelName] ?: return@thenAccept
manager.setTunnelState(tunnel, state)
}
}
}
fun getTunnelState(tunnel: ObservableTunnel): CompletionStage<Tunnel.State> = getAsyncWorker()
.supplyAsync { getBackend().getState(tunnel) }.thenApply(tunnel::onStateChanged)
fun getTunnelStatistics(tunnel: ObservableTunnel): CompletionStage<Statistics> = getAsyncWorker()
.supplyAsync { getBackend().getStatistics(tunnel) }.thenApply(tunnel::onStatisticsChanged)
companion object {
private const val KEY_LAST_USED_TUNNEL = "last_used_tunnel"
private const val KEY_RESTORE_ON_BOOT = "restore_on_boot"
private const val KEY_RUNNING_TUNNELS = "enabled_configs"
}
}
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