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// 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"
// TODO(crbug.com/1052397): Revisit the macro expression once build flag switch
// of lacros-chrome is complete.
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS_LACROS)
#include "net/base/network_change_notifier_linux.h"
#endif
#if BUILDFLAG(IS_APPLE)
#include "base/mac/scoped_nsautorelease_pool.h"
#endif
namespace {
// TODO(crbug.com/1052397): Revisit the macro expression once build flag switch
// of lacros-chrome is complete.
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS_LACROS)
// Flag to specifies which network interfaces to ignore. Interfaces should
// follow as a comma seperated list.
const char kIgnoreNetifFlag[] = "ignore-netif";
#endif
// Conversions from various network-related types to string.
const char* ConnectionTypeToString(
net::NetworkChangeNotifier::ConnectionType type) {
switch (type) {
case net::NetworkChangeNotifier::CONNECTION_UNKNOWN:
return "CONNECTION_UNKNOWN";
case net::NetworkChangeNotifier::CONNECTION_ETHERNET:
return "CONNECTION_ETHERNET";
case net::NetworkChangeNotifier::CONNECTION_WIFI:
return "CONNECTION_WIFI";
case net::NetworkChangeNotifier::CONNECTION_2G:
return "CONNECTION_2G";
case net::NetworkChangeNotifier::CONNECTION_3G:
return "CONNECTION_3G";
case net::NetworkChangeNotifier::CONNECTION_4G:
return "CONNECTION_4G";
case net::NetworkChangeNotifier::CONNECTION_5G:
return "CONNECTION_5G";
case net::NetworkChangeNotifier::CONNECTION_NONE:
return "CONNECTION_NONE";
case net::NetworkChangeNotifier::CONNECTION_BLUETOOTH:
return "CONNECTION_BLUETOOTH";
default:
return "CONNECTION_UNEXPECTED";
}
}
std::string ProxyConfigToString(const net::ProxyConfig& config) {
base::Value config_value = config.ToValue();
std::string str;
base::JSONWriter::Write(config_value, &str);
return str;
}
const char* ConfigAvailabilityToString(
net::ProxyConfigService::ConfigAvailability availability) {
switch (availability) {
case net::ProxyConfigService::CONFIG_PENDING:
return "CONFIG_PENDING";
case net::ProxyConfigService::CONFIG_VALID:
return "CONFIG_VALID";
case net::ProxyConfigService::CONFIG_UNSET:
return "CONFIG_UNSET";
default:
return "CONFIG_UNEXPECTED";
}
}
// 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 {
public:
NetWatcher() = default;
NetWatcher(const NetWatcher&) = delete;
NetWatcher& operator=(const NetWatcher&) = delete;
~NetWatcher() override = default;
// net::NetworkChangeNotifier::IPAddressObserver implementation.
void OnIPAddressChanged() override { LOG(INFO) << "OnIPAddressChanged()"; }
// net::NetworkChangeNotifier::ConnectionTypeObserver implementation.
void OnConnectionTypeChanged(
net::NetworkChangeNotifier::ConnectionType type) override {
LOG(INFO) << "OnConnectionTypeChanged("
<< ConnectionTypeToString(type) << ")";
}
// net::NetworkChangeNotifier::DNSObserver implementation.
void OnDNSChanged() override { LOG(INFO) << "OnDNSChanged()"; }
// net::NetworkChangeNotifier::NetworkChangeObserver implementation.
void OnNetworkChanged(
net::NetworkChangeNotifier::ConnectionType type) override {
LOG(INFO) << "OnNetworkChanged("
<< ConnectionTypeToString(type) << ")";
}
// net::ProxyConfigService::Observer implementation.
void OnProxyConfigChanged(
const net::ProxyConfigWithAnnotation& config,
net::ProxyConfigService::ConfigAvailability availability) override {
LOG(INFO) << "OnProxyConfigChanged(" << ProxyConfigToString(config.value())
<< ", " << ConfigAvailabilityToString(availability) << ")";
}
};
} // namespace
int main(int argc, char* argv[]) {
#if BUILDFLAG(IS_APPLE)
base::mac::ScopedNSAutoreleasePool pool;
#endif
base::AtExitManager exit_manager;
base::CommandLine::Init(argc, argv);
logging::LoggingSettings settings;
settings.logging_dest =
logging::LOG_TO_SYSTEM_DEBUG_LOG | logging::LOG_TO_STDERR;
logging::InitLogging(settings);
// Just make the main task executor the network loop.
base::SingleThreadTaskExecutor io_task_executor(base::MessagePumpType::IO);
base::ThreadPoolInstance::CreateAndStartWithDefaultParams("NetWatcher");
NetWatcher net_watcher;
// TODO(crbug.com/1052397): Revisit the macro expression once build flag switch
// of lacros-chrome is complete.
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS_LACROS)
base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
std::string ignored_netifs_str =
command_line->GetSwitchValueASCII(kIgnoreNetifFlag);
std::unordered_set<std::string> ignored_interfaces;
if (!ignored_netifs_str.empty()) {
for (const std::string& ignored_netif :
base::SplitString(ignored_netifs_str, ",", base::TRIM_WHITESPACE,
base::SPLIT_WANT_ALL)) {
LOG(INFO) << "Ignoring: " << ignored_netif;
ignored_interfaces.insert(ignored_netif);
}
}
auto network_change_notifier =
std::make_unique<net::NetworkChangeNotifierLinux>(ignored_interfaces);
#else
std::unique_ptr<net::NetworkChangeNotifier> network_change_notifier(
net::NetworkChangeNotifier::CreateIfNeeded());
#endif
// Use the network loop as the file loop also.
std::unique_ptr<net::ProxyConfigService> proxy_config_service(
net::ProxyConfigService::CreateSystemProxyConfigService(
io_task_executor.task_runner()));
// Uses |network_change_notifier|.
net::NetworkChangeNotifier::AddIPAddressObserver(&net_watcher);
net::NetworkChangeNotifier::AddConnectionTypeObserver(&net_watcher);
net::NetworkChangeNotifier::AddDNSObserver(&net_watcher);
net::NetworkChangeNotifier::AddNetworkChangeObserver(&net_watcher);
proxy_config_service->AddObserver(&net_watcher);
LOG(INFO) << "Initial connection type: "
<< ConnectionTypeToString(
net::NetworkChangeNotifier::GetConnectionType());
{
net::ProxyConfigWithAnnotation config;
const net::ProxyConfigService::ConfigAvailability availability =
proxy_config_service->GetLatestProxyConfig(&config);
LOG(INFO) << "Initial proxy config: " << ProxyConfigToString(config.value())
<< ", " << ConfigAvailabilityToString(availability);
}
LOG(INFO) << "Watching for network events...";
// Start watching for events.
base::RunLoop().Run();
proxy_config_service->RemoveObserver(&net_watcher);
// Uses |network_change_notifier|.
net::NetworkChangeNotifier::RemoveDNSObserver(&net_watcher);
net::NetworkChangeNotifier::RemoveConnectionTypeObserver(&net_watcher);
net::NetworkChangeNotifier::RemoveIPAddressObserver(&net_watcher);
net::NetworkChangeNotifier::RemoveNetworkChangeObserver(&net_watcher);
return 0;
}
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