1 /*
2  * Copyright (C) 2016 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 
17 package com.android.settings.network;
18 
19 import static android.net.TetheringConstants.EXTRA_ADD_TETHER_TYPE;
20 import static android.net.TetheringConstants.EXTRA_PROVISION_CALLBACK;
21 import static android.net.TetheringManager.TETHERING_INVALID;
22 import static android.net.TetheringManager.TETHER_ERROR_NO_ERROR;
23 import static android.net.TetheringManager.TETHER_ERROR_PROVISIONING_FAILED;
24 import static android.telephony.SubscriptionManager.EXTRA_SUBSCRIPTION_INDEX;
25 import static android.telephony.SubscriptionManager.INVALID_SUBSCRIPTION_ID;
26 
27 import android.app.Activity;
28 import android.content.Intent;
29 import android.content.pm.PackageManager;
30 import android.os.Bundle;
31 import android.os.ResultReceiver;
32 import android.os.UserHandle;
33 import android.telephony.SubscriptionManager;
34 import android.util.Log;
35 
36 import androidx.annotation.VisibleForTesting;
37 
38 /**
39  * Activity which acts as a proxy to the tether provisioning app for sanity checks and permission
40  * restrictions. Specifically, the provisioning apps require
41  * {@link android.permission.TETHER_PRIVILEGED}, while this activity can be started by a caller
42  * with {@link android.permission.TETHER_PRIVILEGED}.
43  */
44 public class TetherProvisioningActivity extends Activity {
45     private static final String TAG = "TetherProvisioningAct";
46     private static final String EXTRA_TETHER_TYPE = "TETHER_TYPE";
47     private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
48     private ResultReceiver mResultReceiver;
49     @VisibleForTesting
50     static final int PROVISION_REQUEST = 0;
51     @VisibleForTesting
52     static final String EXTRA_TETHER_SUBID = "android.net.extra.TETHER_SUBID";
53     @VisibleForTesting
54     public static final String EXTRA_TETHER_UI_PROVISIONING_APP_NAME =
55             "android.net.extra.TETHER_UI_PROVISIONING_APP_NAME";
56 
57     @Override
onCreate(Bundle savedInstanceState)58     public void onCreate(Bundle savedInstanceState) {
59         super.onCreate(savedInstanceState);
60         mResultReceiver = (ResultReceiver) getIntent().getParcelableExtra(EXTRA_PROVISION_CALLBACK);
61 
62         final int tetherType = getIntent().getIntExtra(EXTRA_ADD_TETHER_TYPE, TETHERING_INVALID);
63 
64         final int tetherSubId = getIntent().getIntExtra(
65                 EXTRA_TETHER_SUBID, INVALID_SUBSCRIPTION_ID);
66         final int subId = SubscriptionManager.getActiveDataSubscriptionId();
67         if (tetherSubId != subId) {
68             Log.e(TAG, "This Provisioning request is outdated, current subId: " + subId);
69             mResultReceiver.send(TETHER_ERROR_PROVISIONING_FAILED, null);
70             finish();
71             return;
72         }
73         String[] provisionApp = getIntent().getStringArrayExtra(
74                 EXTRA_TETHER_UI_PROVISIONING_APP_NAME);
75         if (provisionApp == null || provisionApp.length != 2) {
76             Log.e(TAG, "Unexpected provision app configuration");
77             return;
78         }
79         final Intent intent = new Intent(Intent.ACTION_MAIN);
80         intent.setClassName(provisionApp[0], provisionApp[1]);
81         intent.putExtra(EXTRA_TETHER_TYPE, tetherType);
82         intent.putExtra(EXTRA_SUBSCRIPTION_INDEX, subId);
83         intent.putExtra(EXTRA_PROVISION_CALLBACK, mResultReceiver);
84         if (DEBUG) {
85             Log.d(TAG, "Starting provisioning app: " + provisionApp[0] + "." + provisionApp[1]);
86         }
87 
88         if (getPackageManager().queryIntentActivities(intent,
89                 PackageManager.MATCH_DEFAULT_ONLY).isEmpty()) {
90             Log.e(TAG, "Provisioning app is configured, but not available.");
91             mResultReceiver.send(TETHER_ERROR_PROVISIONING_FAILED, null);
92             finish();
93             return;
94         }
95 
96         startActivityForResultAsUser(intent, PROVISION_REQUEST, UserHandle.CURRENT);
97     }
98 
99     @Override
onActivityResult(int requestCode, int resultCode, Intent intent)100     public void onActivityResult(int requestCode, int resultCode, Intent intent) {
101         super.onActivityResult(requestCode, resultCode, intent);
102         if (requestCode == PROVISION_REQUEST) {
103             if (DEBUG) Log.d(TAG, "Got result from app: " + resultCode);
104             int result = resultCode == Activity.RESULT_OK
105                     ? TETHER_ERROR_NO_ERROR : TETHER_ERROR_PROVISIONING_FAILED;
106             mResultReceiver.send(result, null);
107             finish();
108         }
109     }
110 }
111