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// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "metrics/metrics_library.h"
#include <base/logging.h>
#include <base/strings/stringprintf.h>
#include <errno.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <cstdio>
#include <cstring>
#include "constants.h"
#include "serialization/metric_sample.h"
#include "serialization/serialization_utils.h"
static const char kCrosEventHistogramName[] = "Platform.CrOSEvent";
static const int kCrosEventHistogramMax = 100;
/* Add new cros events here.
*
* The index of the event is sent in the message, so please do not
* reorder the names.
*/
static const char *kCrosEventNames[] = {
"ModemManagerCommandSendFailure", // 0
"HwWatchdogReboot", // 1
"Cras.NoCodecsFoundAtBoot", // 2
"Chaps.DatabaseCorrupted", // 3
"Chaps.DatabaseRepairFailure", // 4
"Chaps.DatabaseCreateFailure", // 5
"Attestation.OriginSpecificExhausted", // 6
"SpringPowerSupply.Original.High", // 7
"SpringPowerSupply.Other.High", // 8
"SpringPowerSupply.Original.Low", // 9
"SpringPowerSupply.ChargerIdle", // 10
"TPM.NonZeroDictionaryAttackCounter", // 11
"TPM.EarlyResetDuringCommand", // 12
};
time_t MetricsLibrary::cached_enabled_time_ = 0;
bool MetricsLibrary::cached_enabled_ = false;
MetricsLibrary::MetricsLibrary() : consent_file_(metrics::kConsentFilePath) {}
MetricsLibrary::~MetricsLibrary() {}
// We take buffer and buffer_size as parameters in order to simplify testing
// of various alignments of the |device_name| with |buffer_size|.
bool MetricsLibrary::IsDeviceMounted(const char* device_name,
const char* mounts_file,
char* buffer,
int buffer_size,
bool* result) {
if (buffer == nullptr || buffer_size < 1)
return false;
int mounts_fd = open(mounts_file, O_RDONLY);
if (mounts_fd < 0)
return false;
// match_offset describes:
// -1 -- not beginning of line
// 0..strlen(device_name)-1 -- this offset in device_name is next to match
// strlen(device_name) -- matched full name, just need a space.
int match_offset = 0;
bool match = false;
while (!match) {
int read_size = read(mounts_fd, buffer, buffer_size);
if (read_size <= 0) {
if (errno == -EINTR)
continue;
break;
}
for (int i = 0; i < read_size; ++i) {
if (buffer[i] == '\n') {
match_offset = 0;
continue;
}
if (match_offset < 0) {
continue;
}
if (device_name[match_offset] == '\0') {
if (buffer[i] == ' ') {
match = true;
break;
}
match_offset = -1;
continue;
}
if (buffer[i] == device_name[match_offset]) {
++match_offset;
} else {
match_offset = -1;
}
}
}
close(mounts_fd);
*result = match;
return true;
}
bool MetricsLibrary::IsGuestMode() {
char buffer[256];
bool result = false;
if (!IsDeviceMounted("guestfs",
"/proc/mounts",
buffer,
sizeof(buffer),
&result)) {
return false;
}
return result && (access("/var/run/state/logged-in", F_OK) == 0);
}
bool MetricsLibrary::AreMetricsEnabled() {
static struct stat stat_buffer;
time_t this_check_time = time(nullptr);
if (this_check_time != cached_enabled_time_) {
cached_enabled_time_ = this_check_time;
cached_enabled_ = stat(consent_file_.c_str(), &stat_buffer) >= 0;
}
return cached_enabled_;
}
void MetricsLibrary::Init() {
uma_events_file_ = metrics::kMetricsEventsFilePath;
}
bool MetricsLibrary::SendToUMA(const std::string& name,
int sample,
int min,
int max,
int nbuckets) {
return metrics::SerializationUtils::WriteMetricToFile(
*metrics::MetricSample::HistogramSample(name, sample, min, max, nbuckets)
.get(),
metrics::kMetricsEventsFilePath);
}
bool MetricsLibrary::SendEnumToUMA(const std::string& name, int sample,
int max) {
return metrics::SerializationUtils::WriteMetricToFile(
*metrics::MetricSample::LinearHistogramSample(name, sample, max).get(),
metrics::kMetricsEventsFilePath);
}
bool MetricsLibrary::SendSparseToUMA(const std::string& name, int sample) {
return metrics::SerializationUtils::WriteMetricToFile(
*metrics::MetricSample::SparseHistogramSample(name, sample).get(),
metrics::kMetricsEventsFilePath);
}
bool MetricsLibrary::SendUserActionToUMA(const std::string& action) {
return metrics::SerializationUtils::WriteMetricToFile(
*metrics::MetricSample::UserActionSample(action).get(), metrics::kMetricsEventsFilePath);
}
bool MetricsLibrary::SendCrashToUMA(const char *crash_kind) {
return metrics::SerializationUtils::WriteMetricToFile(
*metrics::MetricSample::CrashSample(crash_kind).get(), metrics::kMetricsEventsFilePath);
}
bool MetricsLibrary::SendCrosEventToUMA(const std::string& event) {
for (size_t i = 0; i < arraysize(kCrosEventNames); i++) {
if (strcmp(event.c_str(), kCrosEventNames[i]) == 0) {
return SendEnumToUMA(kCrosEventHistogramName, i, kCrosEventHistogramMax);
}
}
return false;
}
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