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/*
* Copyright (C) 2010 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.
*/
#define LOG_TAG "TrafficStats"
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <android_runtime/AndroidRuntime.h>
#include <cutils/logger.h>
#include <jni.h>
#include <utils/misc.h>
#include <utils/Log.h>
namespace android {
// Returns an ASCII decimal number read from the specified file, -1 on error.
static jlong readNumber(char const* filename) {
#ifdef HAVE_ANDROID_OS
char buf[80];
int fd = open(filename, O_RDONLY);
if (fd < 0) {
if (errno != ENOENT) LOGE("Can't open %s: %s", filename, strerror(errno));
return -1;
}
int len = read(fd, buf, sizeof(buf) - 1);
if (len < 0) {
LOGE("Can't read %s: %s", filename, strerror(errno));
close(fd);
return -1;
}
close(fd);
buf[len] = '\0';
return atoll(buf);
#else // Simulator
return -1;
#endif
}
// Return the number from the first file which exists and contains data
static jlong tryBoth(char const* a, char const* b) {
jlong num = readNumber(a);
return num >= 0 ? num : readNumber(b);
}
// Returns the sum of numbers from the specified path under /sys/class/net/*,
// -1 if no such file exists.
static jlong readTotal(char const* suffix) {
#ifdef HAVE_ANDROID_OS
char filename[PATH_MAX] = "/sys/class/net/";
DIR *dir = opendir(filename);
if (dir == NULL) {
LOGE("Can't list %s: %s", filename, strerror(errno));
return -1;
}
int len = strlen(filename);
jlong total = -1;
while (struct dirent *entry = readdir(dir)) {
// Skip ., .., and localhost interfaces.
if (entry->d_name[0] != '.' && strncmp(entry->d_name, "lo", 2) != 0) {
strlcpy(filename + len, entry->d_name, sizeof(filename) - len);
strlcat(filename, suffix, sizeof(filename));
jlong num = readNumber(filename);
if (num >= 0) total = total < 0 ? num : total + num;
}
}
closedir(dir);
return total;
#else // Simulator
return -1;
#endif
}
// Mobile stats get accessed a lot more often than total stats.
// Note the individual files can come and go at runtime, so we check
// each file every time (rather than caching which ones exist).
static jlong getMobileTxPackets(JNIEnv* env, jobject clazz) {
return tryBoth(
"/sys/class/net/rmnet0/statistics/tx_packets",
"/sys/class/net/ppp0/statistics/tx_packets");
}
static jlong getMobileRxPackets(JNIEnv* env, jobject clazz) {
return tryBoth(
"/sys/class/net/rmnet0/statistics/rx_packets",
"/sys/class/net/ppp0/statistics/rx_packets");
}
static jlong getMobileTxBytes(JNIEnv* env, jobject clazz) {
return tryBoth(
"/sys/class/net/rmnet0/statistics/tx_bytes",
"/sys/class/net/ppp0/statistics/tx_bytes");
}
static jlong getMobileRxBytes(JNIEnv* env, jobject clazz) {
return tryBoth(
"/sys/class/net/rmnet0/statistics/rx_bytes",
"/sys/class/net/ppp0/statistics/rx_bytes");
}
// Total stats are read less often, so we're willing to put up
// with listing the directory and concatenating filenames.
static jlong getTotalTxPackets(JNIEnv* env, jobject clazz) {
return readTotal("/statistics/tx_packets");
}
static jlong getTotalRxPackets(JNIEnv* env, jobject clazz) {
return readTotal("/statistics/rx_packets");
}
static jlong getTotalTxBytes(JNIEnv* env, jobject clazz) {
return readTotal("/statistics/tx_bytes");
}
static jlong getTotalRxBytes(JNIEnv* env, jobject clazz) {
return readTotal("/statistics/rx_bytes");
}
// Per-UID stats require reading from a constructed filename.
static jlong getUidRxBytes(JNIEnv* env, jobject clazz, jint uid) {
char filename[80];
sprintf(filename, "/proc/uid_stat/%d/tcp_rcv", uid);
return readNumber(filename);
}
static jlong getUidTxBytes(JNIEnv* env, jobject clazz, jint uid) {
char filename[80];
sprintf(filename, "/proc/uid_stat/%d/tcp_snd", uid);
return readNumber(filename);
}
static JNINativeMethod gMethods[] = {
{"getMobileTxPackets", "()J", (void*) getMobileTxPackets},
{"getMobileRxPackets", "()J", (void*) getMobileRxPackets},
{"getMobileTxBytes", "()J", (void*) getMobileTxBytes},
{"getMobileRxBytes", "()J", (void*) getMobileRxBytes},
{"getTotalTxPackets", "()J", (void*) getTotalTxPackets},
{"getTotalRxPackets", "()J", (void*) getTotalRxPackets},
{"getTotalTxBytes", "()J", (void*) getTotalTxBytes},
{"getTotalRxBytes", "()J", (void*) getTotalRxBytes},
{"getUidTxBytes", "(I)J", (void*) getUidTxBytes},
{"getUidRxBytes", "(I)J", (void*) getUidRxBytes},
};
int register_android_net_TrafficStats(JNIEnv* env) {
return AndroidRuntime::registerNativeMethods(env, "android/net/TrafficStats",
gMethods, NELEM(gMethods));
}
}
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