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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/common/shared_file_util.h"
#include "base/file_descriptor_store.h"
#include "base/files/memory_mapped_file.h"
#include "base/files/scoped_file.h"
#include "base/logging.h"
#include "base/posix/global_descriptors.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "content/public/common/content_switches.h"
namespace content {
namespace {
void PopulateFDsFromCommandLine(bool use_global_descriptors) {
const std::string& shared_file_param =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kSharedFiles);
if (shared_file_param.empty()) {
return;
}
std::optional<std::map<int, std::string>> shared_file_descriptors =
ParseSharedFileSwitchValue(shared_file_param);
if (!shared_file_descriptors.has_value()) {
return;
}
for (const auto& descriptor : *shared_file_descriptors) {
base::MemoryMappedFile::Region region;
const std::string& key = descriptor.second;
base::ScopedFD fd;
if (use_global_descriptors) {
fd = base::GlobalDescriptors::GetInstance()->TakeFD(descriptor.first,
®ion);
} else {
DCHECK_EQ(
base::GlobalDescriptors::GetInstance()->MaybeGet(descriptor.first),
-1);
fd.reset(descriptor.first + base::GlobalDescriptors::kBaseDescriptor);
region = base::MemoryMappedFile::Region::kWholeFile;
}
base::FileDescriptorStore::GetInstance().Set(key, std::move(fd), region);
}
}
} // namespace
void PopulateFileDescriptorStoreFromGlobalDescriptors() {
PopulateFDsFromCommandLine(/*use_global_descriptors=*/true);
}
void PopulateFileDescriptorStoreFromFdTable() {
PopulateFDsFromCommandLine(/*use_global_descriptors=*/false);
}
void SharedFileSwitchValueBuilder::AddEntry(const std::string& key_str,
int key_id) {
if (!switch_value_.empty()) {
switch_value_ += ",";
}
switch_value_ += key_str;
switch_value_ += ":";
switch_value_ += base::NumberToString(key_id);
}
std::optional<std::map<int, std::string>> ParseSharedFileSwitchValue(
const std::string& value) {
std::map<int, std::string> values;
std::vector<std::string> string_pairs = base::SplitString(
value, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
for (const auto& pair : string_pairs) {
size_t colon_position = pair.find(":");
if (colon_position == std::string::npos || colon_position == 0 ||
colon_position == pair.size() - 1) {
DLOG(ERROR) << "Found invalid entry parsing shared file string value:"
<< pair;
return std::nullopt;
}
std::string key = pair.substr(0, colon_position);
std::string number_string =
pair.substr(colon_position + 1, std::string::npos);
int key_int;
if (!base::StringToInt(number_string, &key_int)) {
DLOG(ERROR) << "Found invalid entry parsing shared file string value:"
<< number_string << " (not an int).";
return std::nullopt;
}
values[key_int] = key;
}
return std::make_optional(std::move(values));
}
} // namespace content
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