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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/common/crash_keys.h"
#include <array>
#include <deque>
#include <string_view>
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/format_macros.h"
#include "base/no_destructor.h"
#include "base/strings/strcat.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "build/build_config.h"
#include "chrome/common/chrome_switches.h"
#include "components/crash/core/common/crash_key.h"
#include "components/crash/core/common/crash_keys.h"
#include "components/webui/flags/flags_ui_switches.h"
#include "content/public/common/content_switches.h"
#if BUILDFLAG(IS_CHROMEOS)
#include "components/crash/core/app/crash_switches.h"
#include "gpu/command_buffer/service/gpu_switches.h"
#include "ui/gl/gl_switches.h"
#endif
namespace crash_keys {
namespace {
constexpr std::string_view kStringAnnotationsSwitch = "string-annotations";
// A convenient wrapper around a crash key and its name.
//
// The CrashKey contract requires that CrashKeyStrings are never
// moved, copied, or deleted (see
// third_party/crashpad/crashpad/client/annotation.h); since this class holds
// a CrashKeyString, it likewise cannot be moved, copied, or deleted.
class CrashKeyWithName {
public:
explicit CrashKeyWithName(std::string name)
: name_(std::move(name)), crash_key_(name_.c_str()) {}
CrashKeyWithName(const CrashKeyWithName&) = delete;
CrashKeyWithName& operator=(const CrashKeyWithName&) = delete;
CrashKeyWithName(CrashKeyWithName&&) = delete;
CrashKeyWithName& operator=(CrashKeyWithName&&) = delete;
~CrashKeyWithName() = delete;
std::string_view Name() const { return name_; }
std::string_view Value() const { return crash_key_.value(); }
void Clear() { crash_key_.Clear(); }
void Set(std::string_view value) { crash_key_.Set(value); }
private:
std::string name_;
crash_reporter::CrashKeyString<64> crash_key_;
};
void SplitAndPopulateCrashKeys(std::deque<CrashKeyWithName>& crash_keys,
std::string_view comma_separated_feature_list,
std::string crash_key_name_prefix) {
// Crash keys are indestructable so we can not simply empty the deque.
// Instead we must keep the previous crash keys alive and clear their values.
for (CrashKeyWithName& crash_key : crash_keys)
crash_key.Clear();
auto features =
base::SplitString(comma_separated_feature_list, ",",
base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
for (size_t i = 0; i < features.size(); i++) {
if (crash_keys.size() <= i) {
crash_keys.emplace_back(base::StringPrintf(
"%s-%" PRIuS, crash_key_name_prefix.c_str(), i + 1));
}
CrashKeyWithName& crash_key = crash_keys[i];
crash_key.Set(features[i]);
}
}
// --enable-features and --disable-features often contain a long list not
// fitting into 64 bytes, hiding important information when analysing crashes.
// Therefore they are separated out in a list of CrashKeys, one for each enabled
// or disabled feature.
// They are also excluded from the default "switches".
void HandleEnableDisableFeatures(const base::CommandLine& command_line) {
static base::NoDestructor<std::deque<CrashKeyWithName>>
enabled_features_crash_keys;
static base::NoDestructor<std::deque<CrashKeyWithName>>
disabled_features_crash_keys;
SplitAndPopulateCrashKeys(
*enabled_features_crash_keys,
command_line.GetSwitchValueASCII(switches::kEnableFeatures),
"commandline-enabled-feature");
SplitAndPopulateCrashKeys(
*disabled_features_crash_keys,
command_line.GetSwitchValueASCII(switches::kDisableFeatures),
"commandline-disabled-feature");
}
// Return true if we DON'T want to upload this flag to the crash server.
bool IsBoringSwitch(const std::string& flag) {
static const auto kIgnoreSwitches = std::to_array<std::string_view>({
kStringAnnotationsSwitch,
switches::kEnableLogging,
switches::kFlagSwitchesBegin,
switches::kFlagSwitchesEnd,
switches::kLoggingLevel,
switches::kProcessType,
switches::kV,
switches::kVModule,
// This is a serialized buffer which won't fit in the default 64 bytes
// anyways. Should be switches::kGpuPreferences but we run into linking
// errors on Windows if we try to use that directly.
"gpu-preferences",
switches::kEnableFeatures,
switches::kDisableFeatures,
#if BUILDFLAG(IS_MAC)
switches::kMetricsClientID,
#elif BUILDFLAG(IS_CHROMEOS)
// --crash-loop-before is a "boring" switch because it is redundant;
// crash_reporter separately informs the crash server if it is doing
// crash-loop handling.
crash_reporter::switches::kCrashLoopBefore,
switches::kRegisterPepperPlugins,
switches::kUseGL,
switches::kUserDataDir,
// Cros/CC flags are specified as raw strings to avoid dependency.
"child-wallpaper-large",
"child-wallpaper-small",
"default-wallpaper-large",
"default-wallpaper-small",
"guest-wallpaper-large",
"guest-wallpaper-small",
"enterprise-enable-forced-re-enrollment",
"enterprise-enable-forced-re-enrollment-on-flex",
"enterprise-enrollment-initial-modulus",
"enterprise-enrollment-modulus-limit",
"login-profile",
"login-user",
"use-cras",
#endif
});
#if BUILDFLAG(IS_WIN)
// Just about everything has this, don't bother.
if (base::StartsWith(flag, "/prefetch:", base::CompareCase::SENSITIVE))
return true;
#endif
if (!base::StartsWith(flag, "--", base::CompareCase::SENSITIVE))
return false;
size_t end = flag.find("=");
size_t len = (end == std::string::npos) ? flag.length() - 2 : end - 2;
for (size_t i = 0; i < std::size(kIgnoreSwitches); ++i) {
if (flag.compare(2, len, kIgnoreSwitches[i]) == 0)
return true;
}
return false;
}
std::deque<CrashKeyWithName>& GetCommandLineStringAnnotations() {
static base::NoDestructor<std::deque<CrashKeyWithName>>
command_line_string_annotations;
return *command_line_string_annotations;
}
void SetStringAnnotations(const base::CommandLine& command_line) {
// This is only meant to be used to pass annotations from the browser to
// children and not to be used on the browser command line.
if (!command_line.HasSwitch(switches::kProcessType)) {
return;
}
base::StringPairs annotations;
if (!base::SplitStringIntoKeyValuePairs(
command_line.GetSwitchValueASCII(kStringAnnotationsSwitch), '=', ',',
&annotations)) {
return;
}
for (const auto& [key, value] : annotations) {
GetCommandLineStringAnnotations().emplace_back(key).Set(value);
}
}
} // namespace
void AllocateCrashKeyInBrowserAndChildren(std::string_view key,
std::string_view value) {
GetCommandLineStringAnnotations().emplace_back(std::string(key)).Set(value);
}
void AppendStringAnnotationsCommandLineSwitch(base::CommandLine* command_line) {
std::string string_annotations;
for (const auto& crash_key : GetCommandLineStringAnnotations()) {
if (!string_annotations.empty()) {
string_annotations.push_back(',');
}
string_annotations = base::StrCat(
{string_annotations, crash_key.Name(), "=", crash_key.Value()});
}
if (string_annotations.empty()) {
return;
}
command_line->AppendSwitchASCII(kStringAnnotationsSwitch, string_annotations);
}
void SetCrashKeysFromCommandLine(const base::CommandLine& command_line) {
SetStringAnnotations(command_line);
HandleEnableDisableFeatures(command_line);
SetSwitchesFromCommandLine(command_line, &IsBoringSwitch);
}
} // namespace crash_keys
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