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/*
* Copyright (C) 2019 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 android.net.util;
import android.annotation.NonNull;
import android.content.Context;
import android.content.res.Resources;
import android.net.NetworkCapabilities;
import android.text.TextUtils;
import android.util.AndroidRuntimeException;
import com.android.internal.R;
/**
* Collection of utilities for socket keepalive offload.
*
* @hide
*/
public final class KeepaliveUtils {
public static final String TAG = "KeepaliveUtils";
public static class KeepaliveDeviceConfigurationException extends AndroidRuntimeException {
public KeepaliveDeviceConfigurationException(final String msg) {
super(msg);
}
}
/**
* Read supported keepalive count for each transport type from overlay resource. This should be
* used to create a local variable store of resource customization, and use it as the input for
* {@link getSupportedKeepalivesForNetworkCapabilities}.
*
* @param context The context to read resource from.
* @return An array of supported keepalive count for each transport type.
*/
@NonNull
public static int[] getSupportedKeepalives(@NonNull Context context) {
String[] res = null;
try {
res = context.getResources().getStringArray(
R.array.config_networkSupportedKeepaliveCount);
} catch (Resources.NotFoundException unused) {
}
if (res == null) throw new KeepaliveDeviceConfigurationException("invalid resource");
final int[] ret = new int[NetworkCapabilities.MAX_TRANSPORT + 1];
for (final String row : res) {
if (TextUtils.isEmpty(row)) {
throw new KeepaliveDeviceConfigurationException("Empty string");
}
final String[] arr = row.split(",");
if (arr.length != 2) {
throw new KeepaliveDeviceConfigurationException("Invalid parameter length");
}
int transport;
int supported;
try {
transport = Integer.parseInt(arr[0]);
supported = Integer.parseInt(arr[1]);
} catch (NumberFormatException e) {
throw new KeepaliveDeviceConfigurationException("Invalid number format");
}
if (!NetworkCapabilities.isValidTransport(transport)) {
throw new KeepaliveDeviceConfigurationException("Invalid transport " + transport);
}
if (supported < 0) {
throw new KeepaliveDeviceConfigurationException(
"Invalid supported count " + supported + " for "
+ NetworkCapabilities.transportNameOf(transport));
}
ret[transport] = supported;
}
return ret;
}
/**
* Get supported keepalive count for the given {@link NetworkCapabilities}.
*
* @param supportedKeepalives An array of supported keepalive count for each transport type.
* @param nc The {@link NetworkCapabilities} of the network the socket keepalive is on.
*
* @return Supported keepalive count for the given {@link NetworkCapabilities}.
*/
public static int getSupportedKeepalivesForNetworkCapabilities(
@NonNull int[] supportedKeepalives, @NonNull NetworkCapabilities nc) {
final int[] transports = nc.getTransportTypes();
if (transports.length == 0) return 0;
int supportedCount = supportedKeepalives[transports[0]];
// Iterate through transports and return minimum supported value.
for (final int transport : transports) {
if (supportedCount > supportedKeepalives[transport]) {
supportedCount = supportedKeepalives[transport];
}
}
return supportedCount;
}
}
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