| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.providers.settings; |
| |
| import android.annotation.Nullable; |
| import android.annotation.SystemApi; |
| import android.app.ActivityManager; |
| import android.content.IContentProvider; |
| import android.net.Uri; |
| import android.os.Binder; |
| import android.os.Bundle; |
| import android.os.Process; |
| import android.os.RemoteException; |
| import android.os.ResultReceiver; |
| import android.os.ShellCallback; |
| import android.os.ShellCommand; |
| import android.provider.Settings; |
| |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Receives shell commands from the command line related to device config flags, and dispatches them |
| * to the SettingsProvider. |
| * |
| * @hide |
| */ |
| @SystemApi |
| public final class DeviceConfigService extends Binder { |
| /** |
| * TODO(b/113100523): Move this to DeviceConfig.java when it is added, and expose it as a System |
| * API. |
| */ |
| private static final Uri CONFIG_CONTENT_URI = |
| Uri.parse("content://" + Settings.AUTHORITY + "/config"); |
| |
| final SettingsProvider mProvider; |
| |
| public DeviceConfigService(SettingsProvider provider) { |
| mProvider = provider; |
| } |
| |
| @Override |
| public void onShellCommand(FileDescriptor in, FileDescriptor out, FileDescriptor err, |
| String[] args, ShellCallback callback, ResultReceiver resultReceiver) { |
| (new MyShellCommand(mProvider)).exec(this, in, out, err, args, callback, resultReceiver); |
| } |
| |
| static final class MyShellCommand extends ShellCommand { |
| final SettingsProvider mProvider; |
| |
| enum CommandVerb { |
| UNSPECIFIED, |
| GET, |
| PUT, |
| DELETE, |
| LIST, |
| RESET, |
| } |
| |
| MyShellCommand(SettingsProvider provider) { |
| mProvider = provider; |
| } |
| |
| @Override |
| public int onCommand(String cmd) { |
| if (cmd == null || "help".equals(cmd) || "-h".equals(cmd)) { |
| onHelp(); |
| return -1; |
| } |
| |
| final PrintWriter perr = getErrPrintWriter(); |
| boolean isValid = false; |
| CommandVerb verb; |
| if ("get".equalsIgnoreCase(cmd)) { |
| verb = CommandVerb.GET; |
| } else if ("put".equalsIgnoreCase(cmd)) { |
| verb = CommandVerb.PUT; |
| } else if ("delete".equalsIgnoreCase(cmd)) { |
| verb = CommandVerb.DELETE; |
| } else if ("list".equalsIgnoreCase(cmd)) { |
| verb = CommandVerb.LIST; |
| if (peekNextArg() == null) { |
| isValid = true; |
| } |
| } else if ("reset".equalsIgnoreCase(cmd)) { |
| verb = CommandVerb.RESET; |
| } else { |
| // invalid |
| perr.println("Invalid command: " + cmd); |
| return -1; |
| } |
| |
| int resetMode = -1; |
| boolean makeDefault = false; |
| String namespace = null; |
| String key = null; |
| String value = null; |
| String arg = null; |
| while ((arg = getNextArg()) != null) { |
| if (verb == CommandVerb.RESET) { |
| if (resetMode == -1) { |
| if ("untrusted_defaults".equalsIgnoreCase(arg)) { |
| resetMode = Settings.RESET_MODE_UNTRUSTED_DEFAULTS; |
| } else if ("untrusted_clear".equalsIgnoreCase(arg)) { |
| resetMode = Settings.RESET_MODE_UNTRUSTED_CHANGES; |
| } else if ("trusted_defaults".equalsIgnoreCase(arg)) { |
| resetMode = Settings.RESET_MODE_TRUSTED_DEFAULTS; |
| } else { |
| // invalid |
| perr.println("Invalid reset mode: " + arg); |
| return -1; |
| } |
| if (peekNextArg() == null) { |
| isValid = true; |
| } |
| } else { |
| namespace = arg; |
| if (peekNextArg() == null) { |
| isValid = true; |
| } else { |
| // invalid |
| perr.println("Too many arguments"); |
| return -1; |
| } |
| } |
| } else if (namespace == null) { |
| namespace = arg; |
| if (verb == CommandVerb.LIST) { |
| if (peekNextArg() == null) { |
| isValid = true; |
| } else { |
| // invalid |
| perr.println("Too many arguments"); |
| return -1; |
| } |
| } |
| } else if (key == null) { |
| key = arg; |
| if ((verb == CommandVerb.GET || verb == CommandVerb.DELETE)) { |
| if (peekNextArg() == null) { |
| isValid = true; |
| } else { |
| // invalid |
| perr.println("Too many arguments"); |
| return -1; |
| } |
| } |
| } else if (value == null) { |
| value = arg; |
| if (verb == CommandVerb.PUT && peekNextArg() == null) { |
| isValid = true; |
| } |
| } else if ("default".equalsIgnoreCase(arg)) { |
| makeDefault = true; |
| if (verb == CommandVerb.PUT && peekNextArg() == null) { |
| isValid = true; |
| } else { |
| // invalid |
| perr.println("Too many arguments"); |
| return -1; |
| } |
| } |
| } |
| |
| if (!isValid) { |
| perr.println("Bad arguments"); |
| return -1; |
| } |
| |
| final IContentProvider iprovider = mProvider.getIContentProvider(); |
| final PrintWriter pout = getOutPrintWriter(); |
| switch (verb) { |
| case GET: |
| pout.println(get(iprovider, namespace, key)); |
| break; |
| case PUT: |
| put(iprovider, namespace, key, value, makeDefault); |
| break; |
| case DELETE: |
| pout.println(delete(iprovider, namespace, key) |
| ? "Successfully deleted " + key + " from " + namespace |
| : "Failed to delete " + key + " from " + namespace); |
| break; |
| case LIST: |
| for (String line : list(iprovider, namespace)) { |
| pout.println(line); |
| } |
| break; |
| case RESET: |
| reset(iprovider, resetMode, namespace); |
| break; |
| default: |
| perr.println("Unspecified command"); |
| return -1; |
| } |
| return 0; |
| } |
| |
| @Override |
| public void onHelp() { |
| PrintWriter pw = getOutPrintWriter(); |
| pw.println("Device Config (device_config) commands:"); |
| pw.println(" help"); |
| pw.println(" Print this help text."); |
| pw.println(" get NAMESPACE KEY"); |
| pw.println(" Retrieve the current value of KEY from the given NAMESPACE."); |
| pw.println(" put NAMESPACE KEY VALUE [default]"); |
| pw.println(" Change the contents of KEY to VALUE for the given NAMESPACE."); |
| pw.println(" {default} to set as the default value."); |
| pw.println(" delete NAMESPACE KEY"); |
| pw.println(" Delete the entry for KEY for the given NAMESPACE."); |
| pw.println(" list [NAMESPACE]"); |
| pw.println(" Print all keys and values defined, optionally for the given " |
| + "NAMESPACE."); |
| pw.println(" reset RESET_MODE [NAMESPACE]"); |
| pw.println(" Reset all flag values, optionally for a NAMESPACE, according to " |
| + "RESET_MODE."); |
| pw.println(" RESET_MODE is one of {untrusted_defaults, untrusted_clear, " |
| + "trusted_defaults}"); |
| pw.println(" NAMESPACE limits which flags are reset if provided, otherwise all " |
| + "flags are reset"); |
| } |
| |
| private String get(IContentProvider provider, String namespace, String key) { |
| String compositeKey = namespace + "/" + key; |
| String result = null; |
| try { |
| Bundle args = new Bundle(); |
| args.putInt(Settings.CALL_METHOD_USER_KEY, |
| ActivityManager.getService().getCurrentUser().id); |
| Bundle b = provider.call(resolveCallingPackage(), Settings.CALL_METHOD_GET_CONFIG, |
| compositeKey, args); |
| if (b != null) { |
| result = b.getPairValue(); |
| } |
| } catch (RemoteException e) { |
| throw new RuntimeException("Failed in IPC", e); |
| } |
| return result; |
| } |
| |
| private void put(IContentProvider provider, String namespace, String key, String value, |
| boolean makeDefault) { |
| String compositeKey = namespace + "/" + key; |
| |
| try { |
| Bundle args = new Bundle(); |
| args.putString(Settings.NameValueTable.VALUE, value); |
| args.putInt(Settings.CALL_METHOD_USER_KEY, |
| ActivityManager.getService().getCurrentUser().id); |
| if (makeDefault) { |
| args.putBoolean(Settings.CALL_METHOD_MAKE_DEFAULT_KEY, true); |
| } |
| provider.call(resolveCallingPackage(), Settings.CALL_METHOD_PUT_CONFIG, |
| compositeKey, args); |
| } catch (RemoteException e) { |
| throw new RuntimeException("Failed in IPC", e); |
| } |
| } |
| |
| private boolean delete(IContentProvider provider, String namespace, String key) { |
| String compositeKey = namespace + "/" + key; |
| boolean success; |
| |
| try { |
| Bundle args = new Bundle(); |
| args.putInt(Settings.CALL_METHOD_USER_KEY, |
| ActivityManager.getService().getCurrentUser().id); |
| Bundle b = provider.call(resolveCallingPackage(), |
| Settings.CALL_METHOD_DELETE_CONFIG, compositeKey, args); |
| success = (b != null && b.getInt(SettingsProvider.RESULT_ROWS_DELETED) == 1); |
| } catch (RemoteException e) { |
| throw new RuntimeException("Failed in IPC", e); |
| } |
| return success; |
| } |
| |
| private List<String> list(IContentProvider provider, @Nullable String namespace) { |
| final ArrayList<String> lines = new ArrayList<>(); |
| |
| try { |
| Bundle args = new Bundle(); |
| args.putInt(Settings.CALL_METHOD_USER_KEY, |
| ActivityManager.getService().getCurrentUser().id); |
| if (namespace != null) { |
| args.putString(Settings.CALL_METHOD_PREFIX_KEY, namespace); |
| } |
| Bundle b = provider.call(resolveCallingPackage(), |
| Settings.CALL_METHOD_LIST_CONFIG, null, args); |
| if (b != null) { |
| Map<String, String> flagsToValues = |
| (HashMap) b.getSerializable(Settings.NameValueTable.VALUE); |
| for (String key : flagsToValues.keySet()) { |
| lines.add(key + "=" + flagsToValues.get(key)); |
| } |
| } |
| |
| Collections.sort(lines); |
| } catch (RemoteException e) { |
| throw new RuntimeException("Failed in IPC", e); |
| } |
| return lines; |
| } |
| |
| private void reset(IContentProvider provider, int resetMode, @Nullable String namespace) { |
| try { |
| Bundle args = new Bundle(); |
| args.putInt(Settings.CALL_METHOD_USER_KEY, |
| ActivityManager.getService().getCurrentUser().id); |
| args.putInt(Settings.CALL_METHOD_RESET_MODE_KEY, resetMode); |
| args.putString(Settings.CALL_METHOD_PREFIX_KEY, namespace); |
| provider.call( |
| resolveCallingPackage(), Settings.CALL_METHOD_RESET_CONFIG, null, args); |
| } catch (RemoteException e) { |
| throw new RuntimeException("Failed in IPC", e); |
| } |
| } |
| |
| private static String resolveCallingPackage() { |
| switch (Binder.getCallingUid()) { |
| case Process.ROOT_UID: { |
| return "root"; |
| } |
| |
| case Process.SHELL_UID: { |
| return "com.android.shell"; |
| } |
| |
| default: { |
| return null; |
| } |
| } |
| } |
| } |
| } |