/*
* Copyright (C) 2007 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.os;
import android.util.Log;
import java.io.File;
import java.io.RandomAccessFile;
import java.io.IOException;
/** @hide */
public class NetStat {
// Logging tag.
private final static String TAG = "netstat";
// We pre-create all the File objects so we don't spend a lot of
// CPU at runtime converting from Java Strings to byte[] for the
// kernel calls.
private final static File[] MOBILE_TX_PACKETS = mobileFiles("tx_packets");
private final static File[] MOBILE_RX_PACKETS = mobileFiles("rx_packets");
private final static File[] MOBILE_TX_BYTES = mobileFiles("tx_bytes");
private final static File[] MOBILE_RX_BYTES = mobileFiles("rx_bytes");
private final static File SYS_CLASS_NET_DIR = new File("/sys/class/net");
/**
* Get total number of tx packets sent through rmnet0 or ppp0
*
* @return number of Tx packets through rmnet0 or ppp0
*/
public static long getMobileTxPkts() {
return getMobileStat(MOBILE_TX_PACKETS);
}
/**
* Get total number of rx packets received through rmnet0 or ppp0
*
* @return number of Rx packets through rmnet0 or ppp0
*/
public static long getMobileRxPkts() {
return getMobileStat(MOBILE_RX_PACKETS);
}
/**
* Get total number of tx bytes received through rmnet0 or ppp0
*
* @return number of Tx bytes through rmnet0 or ppp0
*/
public static long getMobileTxBytes() {
return getMobileStat(MOBILE_TX_BYTES);
}
/**
* Get total number of rx bytes received through rmnet0 or ppp0
*
* @return number of Rx bytes through rmnet0 or ppp0
*/
public static long getMobileRxBytes() {
return getMobileStat(MOBILE_RX_BYTES);
}
/**
* Get the total number of packets sent through all network interfaces.
*
* @return the number of packets sent through all network interfaces
*/
public static long getTotalTxPkts() {
return getTotalStat("tx_packets");
}
/**
* Get the total number of packets received through all network interfaces.
*
* @return the number of packets received through all network interfaces
*/
public static long getTotalRxPkts() {
return getTotalStat("rx_packets");
}
/**
* Get the total number of bytes sent through all network interfaces.
*
* @return the number of bytes sent through all network interfaces
*/
public static long getTotalTxBytes() {
return getTotalStat("tx_bytes");
}
/**
* Get the total number of bytes received through all network interfaces.
*
* @return the number of bytes received through all network interfaces
*/
public static long getTotalRxBytes() {
return getTotalStat("rx_bytes");
}
/**
* Gets network bytes sent for this UID.
* The statistics are across all interfaces.
* The statistics come from /proc/uid_stat.
*
* {@see android.os.Process#myUid()}.
*
* @param uid
* @return byte count
*/
public static long getUidTxBytes(int uid) {
return getNumberFromFilePath("/proc/uid_stat/" + uid + "/tcp_snd");
}
/**
* Gets network bytes received for this UID.
* The statistics are across all interfaces.
* The statistics come from /proc/uid_stat.
*
* {@see android.os.Process#myUid()}.
*
* @param uid
* @return byte count
*/
public static long getUidRxBytes(int uid) {
return getNumberFromFilePath("/proc/uid_stat/" + uid + "/tcp_rcv");
}
/**
* Returns the array of two possible File locations for a given
* statistic.
*/
private static File[] mobileFiles(String whatStat) {
// Note that we stat them at runtime to see which is
// available, rather than here, to guard against the files
// coming & going later as modules shut down (e.g. airplane
// mode) and whatnot. The runtime stat() isn't expensive compared
// to the previous charset conversion that happened before we
// were reusing File instances.
File[] files = new File[2];
files[0] = new File("/sys/class/net/rmnet0/statistics/" + whatStat);
files[1] = new File("/sys/class/net/ppp0/statistics/" + whatStat);
return files;
}
private static long getTotalStat(String whatStat) {
File netdir = new File("/sys/class/net");
File[] nets = SYS_CLASS_NET_DIR.listFiles();
if (nets == null) {
return 0;
}
long total = 0;
StringBuffer strbuf = new StringBuffer();
for (File net : nets) {
strbuf.append(net.getPath()).append(File.separator).append("statistics")
.append(File.separator).append(whatStat);
total += getNumberFromFilePath(strbuf.toString());
strbuf.setLength(0);
}
return total;
}
private static long getMobileStat(File[] files) {
for (int i = 0; i < files.length; i++) {
File file = files[i];
if (!file.exists()) {
continue;
}
try {
RandomAccessFile raf = new RandomAccessFile(file, "r");
return getNumberFromFile(raf, file.getAbsolutePath());
} catch (IOException e) {
Log.w(TAG,
"Exception opening TCP statistics file " + file.getAbsolutePath(),
e);
}
}
return 0L;
}
// File will have format <number><newline>
private static long getNumberFromFilePath(String filename) {
RandomAccessFile raf = getFile(filename);
if (raf == null) {
return 0L;
}
return getNumberFromFile(raf, filename);
}
// Private buffer for getNumberFromFile. Safe for re-use because
// getNumberFromFile is synchronized.
private final static byte[] buf = new byte[16];
private static synchronized long getNumberFromFile(RandomAccessFile raf, String filename) {
try {
raf.read(buf);
raf.close();
} catch (IOException e) {
Log.w(TAG, "Exception getting TCP bytes from " + filename, e);
return 0L;
} finally {
if (raf != null) {
try {
raf.close();
} catch (IOException e) {
Log.w(TAG, "Exception closing " + filename, e);
}
}
}
long num = 0L;
for (int i = 0; i < buf.length; i++) {
if (buf[i] < '0' || buf[i] > '9') {
break;
}
num *= 10;
num += buf[i] - '0';
}
return num;
}
private static RandomAccessFile getFile(String filename) {
File f = new File(filename);
if (!f.canRead()) {
return null;
}
try {
return new RandomAccessFile(f, "r");
} catch (IOException e) {
Log.w(TAG, "Exception opening TCP statistics file " + filename, e);
return null;
}
}
}
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