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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.settingslib;
     17 
     18 import static android.os.UserManager.DISALLOW_CONFIG_TETHERING;
     19 
     20 import android.content.Context;
     21 import android.net.ConnectivityManager;
     22 import android.os.SystemProperties;
     23 import android.os.UserHandle;
     24 import android.telephony.CarrierConfigManager;
     25 
     26 import androidx.annotation.VisibleForTesting;
     27 
     28 public class TetherUtil {
     29 
     30     @VisibleForTesting
     31     static boolean isEntitlementCheckRequired(Context context) {
     32         final CarrierConfigManager configManager = (CarrierConfigManager) context
     33              .getSystemService(Context.CARRIER_CONFIG_SERVICE);
     34         if (configManager == null || configManager.getConfig() == null) {
     35             // return service default
     36             return true;
     37         }
     38         return configManager.getConfig().getBoolean(CarrierConfigManager
     39              .KEY_REQUIRE_ENTITLEMENT_CHECKS_BOOL);
     40     }
     41 
     42     public static boolean isProvisioningNeeded(Context context) {
     43         // Keep in sync with other usage of config_mobile_hotspot_provision_app.
     44         // ConnectivityManager#enforceTetherChangePermission
     45         String[] provisionApp = context.getResources().getStringArray(
     46                 com.android.internal.R.array.config_mobile_hotspot_provision_app);
     47         if (SystemProperties.getBoolean("net.tethering.noprovisioning", false)
     48                 || provisionApp == null) {
     49             return false;
     50         }
     51         // Check carrier config for entitlement checks
     52         if (isEntitlementCheckRequired(context) == false) {
     53             return false;
     54         }
     55         return (provisionApp.length == 2);
     56     }
     57 
     58     public static boolean isTetherAvailable(Context context) {
     59         final ConnectivityManager cm = context.getSystemService(ConnectivityManager.class);
     60         final boolean tetherConfigDisallowed = RestrictedLockUtilsInternal
     61                 .checkIfRestrictionEnforced(context, DISALLOW_CONFIG_TETHERING,
     62                         UserHandle.myUserId()) != null;
     63         final boolean hasBaseUserRestriction = RestrictedLockUtilsInternal.hasBaseUserRestriction(
     64                 context, DISALLOW_CONFIG_TETHERING, UserHandle.myUserId());
     65         return (cm.isTetheringSupported() || tetherConfigDisallowed) && !hasBaseUserRestriction;
     66     }
     67 }
     68