| /* |
| * Copyright (C) 2017 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.server.connectivity.tethering; |
| |
| import static android.content.Context.TELEPHONY_SERVICE; |
| import static android.net.ConnectivityManager.TYPE_MOBILE; |
| import static android.net.ConnectivityManager.TYPE_MOBILE_DUN; |
| import static android.net.ConnectivityManager.TYPE_MOBILE_HIPRI; |
| |
| import android.content.Context; |
| import android.content.res.Resources; |
| import android.net.ConnectivityManager; |
| import android.telephony.TelephonyManager; |
| import android.util.Log; |
| |
| import java.io.PrintWriter; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.StringJoiner; |
| |
| |
| /** |
| * A utility class to encapsulate the various tethering configuration elements. |
| * |
| * This configuration data includes elements describing upstream properties |
| * (preferred and required types of upstream connectivity as well as default |
| * DNS servers to use if none are available) and downstream properties (such |
| * as regular expressions use to match suitable downstream interfaces and the |
| * DHCPv4 ranges to use). |
| * |
| * @hide |
| */ |
| public class TetheringConfiguration { |
| private static final String TAG = TetheringConfiguration.class.getSimpleName(); |
| |
| public static final int DUN_NOT_REQUIRED = 0; |
| public static final int DUN_REQUIRED = 1; |
| public static final int DUN_UNSPECIFIED = 2; |
| |
| // USB is 192.168.42.1 and 255.255.255.0 |
| // Wifi is 192.168.43.1 and 255.255.255.0 |
| // BT is limited to max default of 5 connections. 192.168.44.1 to 192.168.48.1 |
| // with 255.255.255.0 |
| // P2P is 192.168.49.1 and 255.255.255.0 |
| private static final String[] DHCP_DEFAULT_RANGE = { |
| "192.168.42.2", "192.168.42.254", "192.168.43.2", "192.168.43.254", |
| "192.168.44.2", "192.168.44.254", "192.168.45.2", "192.168.45.254", |
| "192.168.46.2", "192.168.46.254", "192.168.47.2", "192.168.47.254", |
| "192.168.48.2", "192.168.48.254", "192.168.49.2", "192.168.49.254", |
| }; |
| |
| private final String[] DEFAULT_IPV4_DNS = {"8.8.4.4", "8.8.8.8"}; |
| |
| public final String[] tetherableUsbRegexs; |
| public final String[] tetherableWifiRegexs; |
| public final String[] tetherableBluetoothRegexs; |
| public final boolean isDunRequired; |
| public final Collection<Integer> preferredUpstreamIfaceTypes; |
| public final String[] dhcpRanges; |
| public final String[] defaultIPv4DNS; |
| |
| public TetheringConfiguration(Context ctx) { |
| tetherableUsbRegexs = ctx.getResources().getStringArray( |
| com.android.internal.R.array.config_tether_usb_regexs); |
| // TODO: Evaluate deleting this altogether now that Wi-Fi always passes |
| // us an interface name. Careful consideration needs to be given to |
| // implications for Settings and for provisioning checks. |
| tetherableWifiRegexs = ctx.getResources().getStringArray( |
| com.android.internal.R.array.config_tether_wifi_regexs); |
| tetherableBluetoothRegexs = ctx.getResources().getStringArray( |
| com.android.internal.R.array.config_tether_bluetooth_regexs); |
| |
| final int dunCheck = checkDunRequired(ctx); |
| preferredUpstreamIfaceTypes = getUpstreamIfaceTypes(ctx, dunCheck); |
| isDunRequired = preferredUpstreamIfaceTypes.contains(TYPE_MOBILE_DUN); |
| |
| dhcpRanges = getDhcpRanges(ctx); |
| defaultIPv4DNS = copy(DEFAULT_IPV4_DNS); |
| } |
| |
| public boolean isUsb(String iface) { |
| return matchesDownstreamRegexs(iface, tetherableUsbRegexs); |
| } |
| |
| public boolean isWifi(String iface) { |
| return matchesDownstreamRegexs(iface, tetherableWifiRegexs); |
| } |
| |
| public boolean isBluetooth(String iface) { |
| return matchesDownstreamRegexs(iface, tetherableBluetoothRegexs); |
| } |
| |
| public void dump(PrintWriter pw) { |
| dumpStringArray(pw, "tetherableUsbRegexs", tetherableUsbRegexs); |
| dumpStringArray(pw, "tetherableWifiRegexs", tetherableWifiRegexs); |
| dumpStringArray(pw, "tetherableBluetoothRegexs", tetherableBluetoothRegexs); |
| |
| pw.print("isDunRequired: "); |
| pw.println(isDunRequired); |
| |
| String[] upstreamTypes = null; |
| if (preferredUpstreamIfaceTypes != null) { |
| upstreamTypes = new String[preferredUpstreamIfaceTypes.size()]; |
| int i = 0; |
| for (Integer netType : preferredUpstreamIfaceTypes) { |
| upstreamTypes[i] = ConnectivityManager.getNetworkTypeName(netType); |
| i++; |
| } |
| } |
| dumpStringArray(pw, "preferredUpstreamIfaceTypes", upstreamTypes); |
| |
| dumpStringArray(pw, "dhcpRanges", dhcpRanges); |
| dumpStringArray(pw, "defaultIPv4DNS", defaultIPv4DNS); |
| } |
| |
| private static void dumpStringArray(PrintWriter pw, String label, String[] values) { |
| pw.print(label); |
| pw.print(": "); |
| |
| if (values != null) { |
| final StringJoiner sj = new StringJoiner(", ", "[", "]"); |
| for (String value : values) { sj.add(value); } |
| pw.print(sj.toString()); |
| } else { |
| pw.print("null"); |
| } |
| |
| pw.println(); |
| } |
| |
| private static int checkDunRequired(Context ctx) { |
| final TelephonyManager tm = (TelephonyManager) ctx.getSystemService(TELEPHONY_SERVICE); |
| return (tm != null) ? tm.getTetherApnRequired() : DUN_UNSPECIFIED; |
| } |
| |
| private static Collection<Integer> getUpstreamIfaceTypes(Context ctx, int dunCheck) { |
| final int ifaceTypes[] = ctx.getResources().getIntArray( |
| com.android.internal.R.array.config_tether_upstream_types); |
| final ArrayList<Integer> upstreamIfaceTypes = new ArrayList<>(ifaceTypes.length); |
| for (int i : ifaceTypes) { |
| switch (i) { |
| case TYPE_MOBILE: |
| case TYPE_MOBILE_HIPRI: |
| if (dunCheck == DUN_REQUIRED) continue; |
| break; |
| case TYPE_MOBILE_DUN: |
| if (dunCheck == DUN_NOT_REQUIRED) continue; |
| break; |
| } |
| upstreamIfaceTypes.add(i); |
| } |
| |
| // Fix up upstream interface types for DUN or mobile. NOTE: independent |
| // of the value of |dunCheck|, cell data of one form or another is |
| // *always* an upstream, regardless of the upstream interface types |
| // specified by configuration resources. |
| if (dunCheck == DUN_REQUIRED) { |
| if (!upstreamIfaceTypes.contains(TYPE_MOBILE_DUN)) { |
| upstreamIfaceTypes.add(TYPE_MOBILE_DUN); |
| } |
| } else if (dunCheck == DUN_NOT_REQUIRED) { |
| if (!upstreamIfaceTypes.contains(TYPE_MOBILE)) { |
| upstreamIfaceTypes.add(TYPE_MOBILE); |
| } |
| if (!upstreamIfaceTypes.contains(TYPE_MOBILE_HIPRI)) { |
| upstreamIfaceTypes.add(TYPE_MOBILE_HIPRI); |
| } |
| } else { |
| // Fix upstream interface types for case DUN_UNSPECIFIED. |
| // Do not modify if a cellular interface type is already present in the |
| // upstream interface types. Add TYPE_MOBILE and TYPE_MOBILE_HIPRI if no |
| // cellular interface types are found in the upstream interface types. |
| if (!(upstreamIfaceTypes.contains(TYPE_MOBILE_DUN) |
| || upstreamIfaceTypes.contains(TYPE_MOBILE) |
| || upstreamIfaceTypes.contains(TYPE_MOBILE_HIPRI))) { |
| upstreamIfaceTypes.add(TYPE_MOBILE); |
| upstreamIfaceTypes.add(TYPE_MOBILE_HIPRI); |
| } |
| } |
| |
| return upstreamIfaceTypes; |
| } |
| |
| private static boolean matchesDownstreamRegexs(String iface, String[] regexs) { |
| for (String regex : regexs) { |
| if (iface.matches(regex)) return true; |
| } |
| return false; |
| } |
| |
| private static String[] getDhcpRanges(Context ctx) { |
| final String[] fromResource = ctx.getResources().getStringArray( |
| com.android.internal.R.array.config_tether_dhcp_range); |
| if ((fromResource.length > 0) && (fromResource.length % 2 == 0)) { |
| return fromResource; |
| } |
| return copy(DHCP_DEFAULT_RANGE); |
| } |
| |
| private static String[] copy(String[] strarray) { |
| return Arrays.copyOf(strarray, strarray.length); |
| } |
| } |