chromium/net/dns/nsswitch_reader.cc

// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "net/dns/nsswitch_reader.h"

#include <string>
#include <string_view>
#include <utility>
#include <vector>

#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/metrics/histogram_macros.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "build/build_config.h"

#if BUILDFLAG(IS_POSIX)
#include <netdb.h>
#endif  // defined (OS_POSIX)

namespace net {

namespace {

#ifdef _PATH_NSSWITCH_CONF
constexpr base::FilePath::CharType kNsswitchPath[] =
    FILE_PATH_LITERAL(_PATH_NSSWITCH_CONF);
#else
constexpr base::FilePath::CharType kNsswitchPath[] =
    FILE_PATH_LITERAL("/etc/nsswitch.conf");
#endif

// Choose 1 MiB as the largest handled filesize. Arbitrarily chosen as seeming
// large enough to handle any reasonable file contents and similar to the size
// limit for HOSTS files (32 MiB).
constexpr size_t kMaxFileSize =;

std::string ReadNsswitch() {}

std::string_view SkipRestOfLine(std::string_view text) {}

// In case of multiple entries for `database_name`, finds only the first.
std::string_view FindDatabase(std::string_view text,
                              std::string_view database_name) {}

NsswitchReader::ServiceAction TokenizeAction(std::string_view action_column) {}

std::vector<NsswitchReader::ServiceAction> TokenizeActions(
    std::string_view actions) {}

NsswitchReader::ServiceSpecification TokenizeService(
    std::string_view service_column) {}

// Returns the actions string without brackets. `out_num_bytes` returns number
// of bytes in the actions including brackets and trailing whitespace.
std::string_view GetActionsStringAndRemoveBrackets(std::string_view database,
                                                   size_t& out_num_bytes) {}

std::vector<NsswitchReader::ServiceSpecification> TokenizeDatabase(
    std::string_view database) {}

std::vector<NsswitchReader::ServiceSpecification> GetDefaultHosts() {}

}  // namespace

NsswitchReader::ServiceSpecification::ServiceSpecification(
    Service service,
    std::vector<ServiceAction> actions)
    :{}

NsswitchReader::ServiceSpecification::~ServiceSpecification() = default;

NsswitchReader::ServiceSpecification::ServiceSpecification(
    const ServiceSpecification&) = default;

NsswitchReader::ServiceSpecification&
NsswitchReader::ServiceSpecification::operator=(const ServiceSpecification&) =
    default;

NsswitchReader::ServiceSpecification::ServiceSpecification(
    ServiceSpecification&&) = default;

NsswitchReader::ServiceSpecification&
NsswitchReader::ServiceSpecification::operator=(ServiceSpecification&&) =
    default;

NsswitchReader::NsswitchReader()
    :{}

NsswitchReader::~NsswitchReader() = default;

std::vector<NsswitchReader::ServiceSpecification>
NsswitchReader::ReadAndParseHosts() {}

}  // namespace net