chromium/net/tools/net_watcher/net_watcher.cc

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// This is a small utility that watches for and logs network changes.
// It prints out the current network connection type and proxy configuration
// upon startup and then prints out changes as they happen.
// It's useful for testing NetworkChangeNotifier and ProxyConfigService.
// The only command line option supported is --ignore-netif which is followed
// by a comma seperated list of network interfaces to ignore when computing
// connection type; this option is only supported on linux.

#include <memory>
#include <string>
#include <unordered_set>

#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/compiler_specific.h"
#include "base/json/json_writer.h"
#include "base/logging.h"
#include "base/message_loop/message_pump_type.h"
#include "base/run_loop.h"
#include "base/strings/string_split.h"
#include "base/task/single_thread_task_executor.h"
#include "base/task/thread_pool/thread_pool_instance.h"
#include "base/values.h"
#include "build/build_config.h"
#include "build/chromeos_buildflags.h"
#include "net/base/network_change_notifier.h"
#include "net/proxy_resolution/proxy_config.h"
#include "net/proxy_resolution/proxy_config_service.h"
#include "net/proxy_resolution/proxy_config_with_annotation.h"

#if BUILDFLAG(IS_LINUX)
#include "net/base/network_change_notifier_linux.h"
#endif

#if BUILDFLAG(IS_APPLE)
#include "base/apple/scoped_nsautorelease_pool.h"
#endif

namespace {

// TODO(crbug.com/40118868): Revisit the macro expression once build flag switch
// of lacros-chrome is complete.
#if BUILDFLAG(IS_LINUX)
// Flag to specifies which network interfaces to ignore. Interfaces should
// follow as a comma seperated list.
const char kIgnoreNetifFlag[] = …;
#endif

// Conversions from various network-related types to string.

const char* ConnectionTypeToString(
    net::NetworkChangeNotifier::ConnectionType type) { … }

std::string ProxyConfigToString(const net::ProxyConfig& config) { … }

const char* ConfigAvailabilityToString(
    net::ProxyConfigService::ConfigAvailability availability) { … }

// The main observer class that logs network events.
class NetWatcher :
      public net::NetworkChangeNotifier::IPAddressObserver,
      public net::NetworkChangeNotifier::ConnectionTypeObserver,
      public net::NetworkChangeNotifier::DNSObserver,
      public net::NetworkChangeNotifier::NetworkChangeObserver,
      public net::ProxyConfigService::Observer { … };

}  // namespace

int main(int argc, char* argv[]) { … }