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105 changes: 57 additions & 48 deletions
105
android/lib/talpid/src/main/kotlin/net/mullvad/talpid/ConnectivityListener.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,70 +1,79 @@ | ||
| package net.mullvad.talpid | ||
|
|
||
| import android.content.Context | ||
| import android.net.ConnectivityManager | ||
| import android.net.ConnectivityManager.NetworkCallback | ||
| import android.net.LinkProperties | ||
| import android.net.Network | ||
| import android.net.NetworkCapabilities | ||
| import android.net.NetworkRequest | ||
| import kotlin.properties.Delegates.observable | ||
| import java.net.InetAddress | ||
| import kotlinx.coroutines.CoroutineScope | ||
| import kotlinx.coroutines.flow.Flow | ||
| import kotlinx.coroutines.flow.SharingStarted | ||
| import kotlinx.coroutines.flow.StateFlow | ||
| import kotlinx.coroutines.flow.distinctUntilChanged | ||
| import kotlinx.coroutines.flow.filterIsInstance | ||
| import kotlinx.coroutines.flow.map | ||
| import kotlinx.coroutines.flow.onEach | ||
| import kotlinx.coroutines.flow.scan | ||
| import kotlinx.coroutines.flow.stateIn | ||
| import net.mullvad.talpid.util.NetworkEvent | ||
| import net.mullvad.talpid.util.defaultNetworkFlow | ||
| import net.mullvad.talpid.util.networkFlow | ||
|
|
||
| class ConnectivityListener { | ||
| private val availableNetworks = HashSet<Network>() | ||
| class ConnectivityListener(val connectivityManager: ConnectivityManager) { | ||
| private lateinit var _isConnected: StateFlow<Boolean> | ||
| // Used by JNI | ||
| val isConnected | ||
| get() = _isConnected.value | ||
|
|
||
| private val callback = | ||
| object : NetworkCallback() { | ||
| override fun onAvailable(network: Network) { | ||
| availableNetworks.add(network) | ||
| isConnected = true | ||
| } | ||
| private lateinit var _currentDnsServers: StateFlow<List<InetAddress>> | ||
| // Used by JNI | ||
| val currentDnsServers | ||
| get() = ArrayList(_currentDnsServers.value) | ||
|
|
||
| override fun onLost(network: Network) { | ||
| availableNetworks.remove(network) | ||
| isConnected = availableNetworks.isNotEmpty() | ||
| } | ||
| } | ||
| fun register(scope: CoroutineScope) { | ||
| _currentDnsServers = | ||
| dnsServerChanges().stateIn(scope, SharingStarted.Eagerly, currentDnsServers()) | ||
|
|
||
| private lateinit var connectivityManager: ConnectivityManager | ||
| _isConnected = | ||
| hasInternetCapability() | ||
| .onEach { notifyConnectivityChange(it) } | ||
| .stateIn(scope, SharingStarted.Eagerly, false) | ||
| } | ||
|
|
||
| // Used by JNI | ||
| var isConnected by | ||
| observable(false) { _, oldValue, newValue -> | ||
| if (newValue != oldValue) { | ||
| if (senderAddress != 0L) { | ||
| notifyConnectivityChange(newValue, senderAddress) | ||
| } | ||
| } | ||
| } | ||
| private fun dnsServerChanges(): Flow<List<InetAddress>> = | ||
| connectivityManager | ||
| .defaultNetworkFlow() | ||
| .filterIsInstance<NetworkEvent.LinkPropertiesChanged>() | ||
| .map { it.linkProperties.dnsServersWithoutFallback() } | ||
|
|
||
| private fun currentDnsServers(): List<InetAddress> = | ||
| connectivityManager | ||
| .getLinkProperties(connectivityManager.activeNetwork) | ||
| ?.dnsServersWithoutFallback() ?: emptyList() | ||
|
|
||
| var senderAddress = 0L | ||
| private fun LinkProperties.dnsServersWithoutFallback(): List<InetAddress> = | ||
| dnsServers.filter { it.hostAddress != TalpidVpnService.FALLBACK_DUMMY_DNS_SERVER } | ||
|
|
||
| fun register(context: Context) { | ||
| private fun hasInternetCapability(): Flow<Boolean> { | ||
| val request = | ||
| NetworkRequest.Builder() | ||
| .addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET) | ||
| .addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VPN) | ||
| .build() | ||
|
|
||
| connectivityManager = | ||
| context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager | ||
|
|
||
| connectivityManager.registerNetworkCallback(request, callback) | ||
| } | ||
|
|
||
| fun unregister() { | ||
| connectivityManager.unregisterNetworkCallback(callback) | ||
| } | ||
|
|
||
| // DROID-1401 | ||
| // This function has never been used and should most likely be merged into unregister(), | ||
| // along with ensuring that the lifecycle of it is correct. | ||
| @Suppress("UnusedPrivateMember") | ||
| private fun finalize() { | ||
| destroySender(senderAddress) | ||
| senderAddress = 0L | ||
| return connectivityManager | ||
| .networkFlow(request) | ||
| .scan(setOf<Network>()) { networks, event -> | ||
| when (event) { | ||
| is NetworkEvent.Available -> networks + event.network | ||
| is NetworkEvent.Lost -> networks - event.network | ||
| else -> networks | ||
| } | ||
| } | ||
| .map { it.isNotEmpty() } | ||
| .distinctUntilChanged() | ||
| } | ||
|
|
||
| private external fun notifyConnectivityChange(isConnected: Boolean, senderAddress: Long) | ||
|
|
||
| private external fun destroySender(senderAddress: Long) | ||
| private external fun notifyConnectivityChange(isConnected: Boolean) | ||
| } |
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