Implement client limiting and MAC address filtering

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

@@ -1,7 +1,9 @@
 package be.mygod.vpnhotspot.manage
 
 import android.annotation.TargetApi
+import android.content.ClipData
 import android.content.Intent
+import android.net.MacAddress
 import android.os.Build
 import android.provider.Settings
 import android.view.View
@@ -161,6 +163,14 @@ sealed class TetherManager(protected val parent: TetheringFragment) : Manager(),
             capability = maxSupportedClients to supportedFeatures
             data.notifyChange()
         }
+        override fun onBlockedClientConnecting(client: MacAddress, blockedReason: Int) {
+            SmartSnackbar.make(parent.getString(R.string.tethering_manage_wifi_client_blocked, client,
+                    WifiApManager.clientBlockLookup(blockedReason, true))).apply {
+                action(R.string.tethering_manage_wifi_copy_mac) {
+                    app.clipboard.setPrimaryClip(ClipData.newPlainText(null, client.toString()))
+                }
+            }.show()
+        }
 
         override val title get() = parent.getString(R.string.tethering_manage_wifi)
         override val tetherType get() = TetherType.WIFI

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

@@ -33,9 +33,9 @@ data class SoftApConfigurationCompat(
         @TargetApi(30)
         var isClientControlByUserEnabled: Boolean = false,
         @RequiresApi(30)
-        var blockedClientList: List<MacAddress?> = emptyList(),
+        var blockedClientList: List<MacAddress> = emptyList(),
         @RequiresApi(30)
-        var allowedClientList: List<MacAddress?> = emptyList(),
+        var allowedClientList: List<MacAddress> = emptyList(),
         var underlying: Parcelable? = null) : Parcelable {
     companion object {
         const val BAND_2GHZ = 1
@@ -238,8 +238,8 @@ data class SoftApConfigurationCompat(
                 isAutoShutdownEnabled(this) as Boolean,
                 getShutdownTimeoutMillis(this) as Long,
                 isClientControlByUserEnabled(this) as Boolean,
-                getBlockedClientList(this) as List<MacAddress?>,
-                getAllowedClientList(this) as List<MacAddress?>,
+                getBlockedClientList(this) as List<MacAddress>,
+                getAllowedClientList(this) as List<MacAddress>,
                 this)
     }
 

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

@@ -1,8 +1,10 @@
 package be.mygod.vpnhotspot.net.wifi
 
 import android.annotation.SuppressLint
+import android.annotation.TargetApi
 import android.content.ClipData
 import android.content.DialogInterface
+import android.net.MacAddress
 import android.net.wifi.SoftApConfiguration
 import android.os.Build
 import android.os.Parcelable
@@ -42,6 +44,7 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
         Toolbar.OnMenuItemClickListener {
     companion object {
         private const val BASE64_FLAGS = Base64.NO_PADDING or Base64.NO_WRAP
+        private val nonMacChars = "[^0-9a-fA-F:]+".toRegex()
         private val channels by lazy {
             val list = ArrayList<BandOption.Channel>()
             for (chan in 1..14) list.add(BandOption.Channel(SoftApConfigurationCompat.BAND_2GHZ, chan))
@@ -109,7 +112,7 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
             securityType = dialogView.security.selectedItemPosition
             isHiddenSsid = dialogView.hiddenSsid.isChecked
         }
-        if (full) {
+        if (full) @TargetApi(28) {
             isAutoShutdownEnabled = dialogView.autoShutdown.isChecked
             shutdownTimeoutMillis = dialogView.timeout.text.let { text ->
                 if (text.isNullOrEmpty()) 0 else text.toString().toLong()
@@ -120,6 +123,14 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
             bssid = if (dialogView.bssid.length() != 0) {
                 MacAddressCompat.fromString(dialogView.bssid.text.toString())
             } else null
+            maxNumberOfClients = dialogView.maxClient.text.let { text ->
+                if (text.isNullOrEmpty()) 0 else text.toString().toInt()
+            }
+            isClientControlByUserEnabled = dialogView.clientUserControl.isChecked
+            allowedClientList = (dialogView.allowedList.text ?: "").split(nonMacChars)
+                    .filter { it.isNotEmpty() }.map { MacAddress.fromString(it) }
+            blockedClientList = (dialogView.blockedList.text ?: "").split(nonMacChars)
+                    .filter { it.isNotEmpty() }.map { MacAddress.fromString(it) }
         }
     }
 
@@ -150,7 +161,7 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
         if (arg.p2pMode || Build.VERSION.SDK_INT >= 30) {
             dialogView.timeoutWrapper.helperText = getString(R.string.wifi_hotspot_timeout_default,
                     TetherTimeoutMonitor.defaultTimeout)
-            if (!arg.readOnly) dialogView.timeout.addTextChangedListener(this@WifiApDialogFragment)
+            dialogView.timeout.addTextChangedListener(this@WifiApDialogFragment)
         } else dialogView.timeoutWrapper.isGone = true
         if (Build.VERSION.SDK_INT >= 23 || arg.p2pMode) dialogView.band.apply {
             bandOptions = mutableListOf<BandOption>().apply {
@@ -175,6 +186,16 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
         } else dialogView.bandWrapper.isGone = true
         dialogView.bssid.addTextChangedListener(this@WifiApDialogFragment)
         if (arg.p2pMode) dialogView.hiddenSsid.isGone = true
+        if (arg.p2pMode || Build.VERSION.SDK_INT < 30) {
+            dialogView.maxClientWrapper.isGone = true
+            dialogView.clientUserControl.isGone = true
+            dialogView.blockedListWrapper.isGone = true
+            dialogView.allowedListWrapper.isGone = true
+        } else {
+            dialogView.maxClient.addTextChangedListener(this@WifiApDialogFragment)
+            dialogView.blockedList.addTextChangedListener(this@WifiApDialogFragment)
+            dialogView.allowedList.addTextChangedListener(this@WifiApDialogFragment)
+        }
         base = arg.configuration
         populateFromConfiguration()
     }
@@ -193,18 +214,19 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
         }
         dialogView.bssid.setText(base.bssid?.toString())
         dialogView.hiddenSsid.isChecked = base.isHiddenSsid
-        // TODO support more fields from SACC
+        dialogView.maxClient.setText(base.maxNumberOfClients.let { if (it == 0) "" else it.toString() })
+        dialogView.clientUserControl.isChecked = base.isClientControlByUserEnabled
+        dialogView.blockedList.setText(base.blockedClientList.joinToString("\n"))
+        dialogView.allowedList.setText(base.allowedClientList.joinToString("\n"))
     }
 
     override fun onStart() {
         super.onStart()
         started = true
-        if (!arg.readOnly) validate()
+        validate()
     }
 
-    /**
-     * This function is reached only if not arg.readOnly.
-     */
+    @TargetApi(28)
     private fun validate() {
         if (!started) return
         val ssidLength = dialogView.ssid.text.toString().toByteArray().size
@@ -239,9 +261,36 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
             dialogView.bssidWrapper.error = e.readableMessage
             false
         }
+        val maxClientError = dialogView.maxClient.text.let { text ->
+            if (text.isNullOrEmpty()) null else try {
+                text.toString().toInt()
+                null
+            } catch (e: NumberFormatException) {
+                e.readableMessage
+            }
+        }
+        dialogView.maxClientWrapper.error = maxClientError
+        val blockedListError = try {
+            (dialogView.blockedList.text ?: "").split(nonMacChars)
+                    .filter { it.isNotEmpty() }.forEach { MacAddress.fromString(it) }
+            null
+        } catch (e: IllegalArgumentException) {
+            e.readableMessage
+        }
+        dialogView.blockedListWrapper.error = blockedListError
+        val allowedListError = try {
+            (dialogView.allowedList.text ?: "").split(nonMacChars)
+                    .filter { it.isNotEmpty() }.forEach { MacAddress.fromString(it) }
+            null
+        } catch (e: IllegalArgumentException) {
+            e.readableMessage
+        }
+        dialogView.allowedListWrapper.error = allowedListError
+        val canCopy = timeoutError == null && bssidValid && maxClientError == null && blockedListError == null &&
+                allowedListError == null
         (dialog as? AlertDialog)?.getButton(DialogInterface.BUTTON_POSITIVE)?.isEnabled =
-                ssidLength in 1..32 && passwordValid && timeoutError == null && bssidValid
-        dialogView.toolbar.menu.findItem(android.R.id.copy).isEnabled = timeoutError == null && bssidValid
+                ssidLength in 1..32 && passwordValid && canCopy
+        dialogView.toolbar.menu.findItem(android.R.id.copy).isEnabled = canCopy
     }
 
     override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) { }

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

@@ -97,6 +97,8 @@ object WifiApManager {
     @RequiresApi(28)
     val failureReasonLookup = ConstantLookup<WifiManager>("SAP_START_FAILURE_",
             "SAP_START_FAILURE_GENERAL", "SAP_START_FAILURE_NO_CHANNEL")
+    @get:RequiresApi(30)
+    val clientBlockLookup by lazy { ConstantLookup<WifiManager>("SAP_CLIENT_") }
 
     private val interfaceSoftApCallback by lazy { Class.forName("android.net.wifi.WifiManager\$SoftApCallback") }
     private val registerSoftApCallback by lazy {

mobile/src/main/res/layout/dialog_wifi_ap.xml

@@ -143,6 +143,7 @@
                 android:layout_marginTop="8dip"
                 app:counterEnabled="true"
                 app:counterMaxLength="17"
+                app:errorEnabled="true"
                 android:hint="@string/wifi_advanced_mac_address_title">
                 <com.google.android.material.textfield.TextInputEditText
                     android:id="@+id/bssid"
@@ -159,6 +160,58 @@
                 android:layout_marginTop="8dip"
                 style="@style/wifi_item_label"
                 android:text="@string/wifi_hidden_network"/>
+            <com.google.android.material.textfield.TextInputLayout
+                android:id="@+id/max_client_wrapper"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="8dip"
+                app:counterEnabled="true"
+                app:counterMaxLength="10"
+                app:errorEnabled="true"
+                android:hint="@string/wifi_max_clients">
+                <com.google.android.material.textfield.TextInputEditText
+                    android:id="@+id/max_client"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    style="@style/wifi_item_edit_content"
+                    android:inputType="number"
+                    android:maxLength="10" />
+            </com.google.android.material.textfield.TextInputLayout>
+            <Switch
+                android:id="@+id/client_user_control"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="8dip"
+                style="@style/wifi_item_label"
+                android:text="@string/wifi_client_user_control"/>
+            <com.google.android.material.textfield.TextInputLayout
+                android:id="@+id/blocked_list_wrapper"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="8dip"
+                android:hint="@string/wifi_blocked_list"
+                app:errorEnabled="true">
+                <com.google.android.material.textfield.TextInputEditText
+                    android:id="@+id/blocked_list"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    style="@style/wifi_item_edit_content"
+                    android:inputType="textMultiLine|textNoSuggestions" />
+            </com.google.android.material.textfield.TextInputLayout>
+            <com.google.android.material.textfield.TextInputLayout
+                android:id="@+id/allowed_list_wrapper"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="8dip"
+                android:hint="@string/wifi_allowed_list"
+                app:errorEnabled="true">
+                <com.google.android.material.textfield.TextInputEditText
+                    android:id="@+id/allowed_list"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    style="@style/wifi_item_edit_content"
+                    android:inputType="textMultiLine|textNoSuggestions" />
+            </com.google.android.material.textfield.TextInputLayout>
         </LinearLayout>
     </ScrollView>
 </LinearLayout>

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

@@ -70,6 +70,8 @@
     <string name="tethering_manage_wifi_info">%1$d MHz, channel %2$d, width %3$s</string>
     <string name="tethering_manage_wifi_capabilities">%1$s/%2$d clients connected\nSupported features: %3$s</string>
     <string name="tethering_manage_wifi_no_features">None</string>
+    <string name="tethering_manage_wifi_client_blocked">Blocked %1$s: %2$s</string>
+    <string name="tethering_manage_wifi_copy_mac">Copy MAC</string>
 
     <string name="connected_state_incomplete">" (connecting)"</string>
     <string name="connected_state_valid">" (reachable)"</string>
@@ -184,6 +186,10 @@
     <string name="wifi_ap_choose_6G">6.0 GHz Band</string>
     <string name="wifi_advanced_mac_address_title">MAC address</string>
     <string name="wifi_hidden_network">Hidden network</string>
+    <string name="wifi_max_clients">Maximum number of clients</string>
+    <string name="wifi_client_user_control">Control which client can use hotspot</string>
+    <string name="wifi_blocked_list">Blocked list of clients</string>
+    <string name="wifi_allowed_list">Allowed list of clients</string>
     <string name="wifi_save">Save</string>
 
     <!-- Based on: https://github.com/PrivacyApps/donations/blob/747d36a18433c7e9329691054122a8ad337a62d2/Donations/src/main/res/values/donations__strings.xml -->