chrome/browser/io_thread.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/io_thread.h"
   6
   7 #include <vector>
   8
   9 #include "base/base64.h"
  10 #include "base/bind.h"
  11 #include "base/bind_helpers.h"
  12 #include "base/command_line.h"
  13 #include "base/compiler_specific.h"
  14 #include "base/debug/leak_tracker.h"
  15 #include "base/debug/trace_event.h"
  16 #include "base/logging.h"
  17 #include "base/metrics/field_trial.h"
  18 #include "base/prefs/pref_registry_simple.h"
  19 #include "base/prefs/pref_service.h"
  20 #include "base/stl_util.h"
  21 #include "base/strings/string_number_conversions.h"
  22 #include "base/strings/string_split.h"
  23 #include "base/strings/string_util.h"
  24 #include "base/threading/sequenced_worker_pool.h"
  25 #include "base/threading/thread.h"
  26 #include "base/threading/worker_pool.h"
  27 #include "base/time/time.h"
  28 #include "build/build_config.h"
  29 #include "chrome/browser/browser_process.h"
  30 #include "chrome/browser/extensions/event_router_forwarder.h"
  31 #include "chrome/browser/net/async_dns_field_trial.h"
  32 #include "chrome/browser/net/chrome_net_log.h"
  33 #include "chrome/browser/net/chrome_network_delegate.h"
  34 #include "chrome/browser/net/chrome_url_request_context.h"
  35 #include "chrome/browser/net/connect_interceptor.h"
  36 #include "chrome/browser/net/dns_probe_service.h"
  37 #include "chrome/browser/net/pref_proxy_config_tracker.h"
  38 #include "chrome/browser/net/proxy_service_factory.h"
  39 #include "chrome/common/chrome_content_client.h"
  40 #include "chrome/common/chrome_switches.h"
  41 #include "chrome/common/chrome_version_info.h"
  42 #include "chrome/common/pref_names.h"
  43 #include "components/data_reduction_proxy/browser/data_reduction_proxy_prefs.h"
  44 #include "components/policy/core/common/policy_service.h"
  45 #include "components/variations/variations_associated_data.h"
  46 #include "content/public/browser/browser_thread.h"
  47 #include "content/public/browser/cookie_store_factory.h"
  48 #include "net/base/host_mapping_rules.h"
  49 #include "net/base/net_util.h"
  50 #include "net/cert/cert_verifier.h"
  51 #include "net/cert/cert_verify_proc.h"
  52 #include "net/cert/ct_known_logs.h"
  53 #include "net/cert/ct_verifier.h"
  54 #include "net/cert/multi_threaded_cert_verifier.h"
  55 #include "net/cookies/cookie_store.h"
  56 #include "net/dns/host_cache.h"
  57 #include "net/dns/host_resolver.h"
  58 #include "net/dns/mapped_host_resolver.h"
  59 #include "net/ftp/ftp_network_layer.h"
  60 #include "net/http/http_auth_filter.h"
  61 #include "net/http/http_auth_handler_factory.h"
  62 #include "net/http/http_network_layer.h"
  63 #include "net/http/http_server_properties_impl.h"
  64 #include "net/proxy/proxy_config_service.h"
  65 #include "net/proxy/proxy_script_fetcher_impl.h"
  66 #include "net/proxy/proxy_service.h"
  67 #include "net/quic/quic_protocol.h"
  68 #include "net/socket/tcp_client_socket.h"
  69 #include "net/spdy/spdy_session.h"
  70 #include "net/ssl/default_server_bound_cert_store.h"
  71 #include "net/ssl/server_bound_cert_service.h"
  72 #include "net/url_request/data_protocol_handler.h"
  73 #include "net/url_request/file_protocol_handler.h"
  74 #include "net/url_request/ftp_protocol_handler.h"
  75 #include "net/url_request/static_http_user_agent_settings.h"
  76 #include "net/url_request/url_fetcher.h"
  77 #include "net/url_request/url_request_job_factory_impl.h"
  78 #include "net/url_request/url_request_throttler_manager.h"
  79 #include "url/url_constants.h"
  80
  81 #if defined(ENABLE_CONFIGURATION_POLICY)
  82 #include "policy/policy_constants.h"
  83 #endif
  84
  85 #if !defined(USE_OPENSSL)
  86 #include "net/cert/ct_log_verifier.h"
  87 #include "net/cert/multi_log_ct_verifier.h"
  88 #endif
  89
  90 #if defined(USE_NSS) || defined(OS_IOS)
  91 #include "net/ocsp/nss_ocsp.h"
  92 #endif
  93
  94 #if defined(OS_ANDROID) || defined(OS_IOS)
  95 #include "components/data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.h"
  96 #include "components/data_reduction_proxy/browser/data_reduction_proxy_params.h"
  97 #include "components/data_reduction_proxy/browser/data_reduction_proxy_settings.h"
  98 #endif
  99
 100 #if defined(OS_CHROMEOS)
 101 #include "chrome/browser/chromeos/login/users/user_manager.h"
 102 #include "chrome/browser/chromeos/net/cert_verify_proc_chromeos.h"
 103 #include "chromeos/network/host_resolver_impl_chromeos.h"
 104 #endif
 105
 106 using content::BrowserThread;
 107
 108 #if defined(OS_ANDROID) || defined(OS_IOS)
 109 using data_reduction_proxy::DataReductionProxyAuthRequestHandler;
 110 using data_reduction_proxy::DataReductionProxyParams;
 111 using data_reduction_proxy::DataReductionProxyUsageStats;
 112 using data_reduction_proxy::DataReductionProxySettings;
 113 #endif
 114
 115 class SafeBrowsingURLRequestContext;
 116
 117 // The IOThread object must outlive any tasks posted to the IO thread before the
 118 // Quit task, so base::Bind() calls are not refcounted.
 119
 120 namespace {
 121
 122 const char kQuicFieldTrialName[] = "QUIC";
 123 const char kQuicFieldTrialEnabledGroupName[] = "Enabled";
 124 const char kQuicFieldTrialHttpsEnabledGroupName[] = "HttpsEnabled";
 125 const char kQuicFieldTrialPacketLengthSuffix[] = "BytePackets";
 126 const char kQuicFieldTrialPacingSuffix[] = "WithPacing";
 127 const char kQuicFieldTrialTimeBasedLossDetectionSuffix[] =
 128     "WithTimeBasedLossDetection";
 129
 130 // The SPDY trial composes two different trial plus control groups:
 131 //  * A "holdback" group with SPDY disabled, and corresponding control
 132 //  (SPDY/3.1). The primary purpose of the holdback group is to encourage site
 133 //  operators to do feature detection rather than UA-sniffing. As such, this
 134 //  trial runs continuously.
 135 //  * A SPDY/4 experiment, for SPDY/4 (aka HTTP/2) vs SPDY/3.1 comparisons and
 136 //  eventual SPDY/4 deployment.
 137 const char kSpdyFieldTrialName[] = "SPDY";
 138 const char kSpdyFieldTrialHoldbackGroupName[] = "SpdyDisabled";
 139 const char kSpdyFieldTrialHoldbackControlGroupName[] = "Control";
 140 const char kSpdyFieldTrialSpdy4GroupName[] = "Spdy4Enabled";
 141 const char kSpdyFieldTrialSpdy4ControlGroupName[] = "Spdy4Control";
 142
 143 #if defined(OS_MACOSX) && !defined(OS_IOS)
 144 void ObserveKeychainEvents() {
 145   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 146   net::CertDatabase::GetInstance()->SetMessageLoopForKeychainEvents();
 147 }
 148 #endif
 149
 150 // Used for the "system" URLRequestContext.
 151 class SystemURLRequestContext : public net::URLRequestContext {
 152  public:
 153   SystemURLRequestContext() {
 154 #if defined(USE_NSS) || defined(OS_IOS)
 155     net::SetURLRequestContextForNSSHttpIO(this);
 156 #endif
 157   }
 158
 159  private:
 160   virtual ~SystemURLRequestContext() {
 161 #if defined(USE_NSS) || defined(OS_IOS)
 162     net::SetURLRequestContextForNSSHttpIO(NULL);
 163 #endif
 164   }
 165 };
 166
 167 scoped_ptr<net::HostResolver> CreateGlobalHostResolver(net::NetLog* net_log) {
 168   TRACE_EVENT0("startup", "IOThread::CreateGlobalHostResolver");
 169   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 170
 171   net::HostResolver::Options options;
 172
 173   // Use the concurrency override from the command-line, if any.
 174   if (command_line.HasSwitch(switches::kHostResolverParallelism)) {
 175     std::string s =
 176         command_line.GetSwitchValueASCII(switches::kHostResolverParallelism);
 177
 178     // Parse the switch (it should be a positive integer formatted as decimal).
 179     int n;
 180     if (base::StringToInt(s, &n) && n > 0) {
 181       options.max_concurrent_resolves = static_cast<size_t>(n);
 182     } else {
 183       LOG(ERROR) << "Invalid switch for host resolver parallelism: " << s;
 184     }
 185   }
 186
 187   // Use the retry attempts override from the command-line, if any.
 188   if (command_line.HasSwitch(switches::kHostResolverRetryAttempts)) {
 189     std::string s =
 190         command_line.GetSwitchValueASCII(switches::kHostResolverRetryAttempts);
 191     // Parse the switch (it should be a non-negative integer).
 192     int n;
 193     if (base::StringToInt(s, &n) && n >= 0) {
 194       options.max_retry_attempts = static_cast<size_t>(n);
 195     } else {
 196       LOG(ERROR) << "Invalid switch for host resolver retry attempts: " << s;
 197     }
 198   }
 199
 200   scoped_ptr<net::HostResolver> global_host_resolver;
 201 #if defined OS_CHROMEOS
 202   global_host_resolver =
 203       chromeos::HostResolverImplChromeOS::CreateSystemResolver(options,
 204                                                                net_log);
 205 #else
 206   global_host_resolver =
 207       net::HostResolver::CreateSystemResolver(options, net_log);
 208 #endif
 209
 210   // Determine if we should disable IPv6 support.
 211   if (command_line.HasSwitch(switches::kEnableIPv6)) {
 212     // Disable IPv6 probing.
 213     global_host_resolver->SetDefaultAddressFamily(
 214         net::ADDRESS_FAMILY_UNSPECIFIED);
 215   } else if (command_line.HasSwitch(switches::kDisableIPv6)) {
 216     global_host_resolver->SetDefaultAddressFamily(net::ADDRESS_FAMILY_IPV4);
 217   }
 218
 219   // If hostname remappings were specified on the command-line, layer these
 220   // rules on top of the real host resolver. This allows forwarding all requests
 221   // through a designated test server.
 222   if (!command_line.HasSwitch(switches::kHostResolverRules))
 223     return global_host_resolver.PassAs<net::HostResolver>();
 224
 225   scoped_ptr<net::MappedHostResolver> remapped_resolver(
 226       new net::MappedHostResolver(global_host_resolver.Pass()));
 227   remapped_resolver->SetRulesFromString(
 228       command_line.GetSwitchValueASCII(switches::kHostResolverRules));
 229   return remapped_resolver.PassAs<net::HostResolver>();
 230 }
 231
 232 // TODO(willchan): Remove proxy script fetcher context since it's not necessary
 233 // now that I got rid of refcounting URLRequestContexts.
 234 // See IOThread::Globals for details.
 235 net::URLRequestContext*
 236 ConstructProxyScriptFetcherContext(IOThread::Globals* globals,
 237                                    net::NetLog* net_log) {
 238   net::URLRequestContext* context = new net::URLRequestContext;
 239   context->set_net_log(net_log);
 240   context->set_host_resolver(globals->host_resolver.get());
 241   context->set_cert_verifier(globals->cert_verifier.get());
 242   context->set_transport_security_state(
 243       globals->transport_security_state.get());
 244   context->set_cert_transparency_verifier(
 245       globals->cert_transparency_verifier.get());
 246   context->set_http_auth_handler_factory(
 247       globals->http_auth_handler_factory.get());
 248   context->set_proxy_service(globals->proxy_script_fetcher_proxy_service.get());
 249   context->set_http_transaction_factory(
 250       globals->proxy_script_fetcher_http_transaction_factory.get());
 251   context->set_job_factory(
 252       globals->proxy_script_fetcher_url_request_job_factory.get());
 253   context->set_cookie_store(globals->system_cookie_store.get());
 254   context->set_server_bound_cert_service(
 255       globals->system_server_bound_cert_service.get());
 256   context->set_network_delegate(globals->system_network_delegate.get());
 257   context->set_http_user_agent_settings(
 258       globals->http_user_agent_settings.get());
 259   // TODO(rtenneti): We should probably use HttpServerPropertiesManager for the
 260   // system URLRequestContext too. There's no reason this should be tied to a
 261   // profile.
 262   return context;
 263 }
 264
 265 net::URLRequestContext*
 266 ConstructSystemRequestContext(IOThread::Globals* globals,
 267                               net::NetLog* net_log) {
 268   net::URLRequestContext* context = new SystemURLRequestContext;
 269   context->set_net_log(net_log);
 270   context->set_host_resolver(globals->host_resolver.get());
 271   context->set_cert_verifier(globals->cert_verifier.get());
 272   context->set_transport_security_state(
 273       globals->transport_security_state.get());
 274   context->set_cert_transparency_verifier(
 275       globals->cert_transparency_verifier.get());
 276   context->set_http_auth_handler_factory(
 277       globals->http_auth_handler_factory.get());
 278   context->set_proxy_service(globals->system_proxy_service.get());
 279   context->set_http_transaction_factory(
 280       globals->system_http_transaction_factory.get());
 281   context->set_job_factory(globals->system_url_request_job_factory.get());
 282   context->set_cookie_store(globals->system_cookie_store.get());
 283   context->set_server_bound_cert_service(
 284       globals->system_server_bound_cert_service.get());
 285   context->set_throttler_manager(globals->throttler_manager.get());
 286   context->set_network_delegate(globals->system_network_delegate.get());
 287   context->set_http_user_agent_settings(
 288       globals->http_user_agent_settings.get());
 289   return context;
 290 }
 291
 292 int GetSwitchValueAsInt(const CommandLine& command_line,
 293                         const std::string& switch_name) {
 294   int value;
 295   if (!base::StringToInt(command_line.GetSwitchValueASCII(switch_name),
 296                          &value)) {
 297     return 0;
 298   }
 299   return value;
 300 }
 301
 302 // Returns the value associated with |key| in |params| or "" if the
 303 // key is not present in the map.
 304 const std::string& GetVariationParam(
 305     const std::map<std::string, std::string>& params,
 306     const std::string& key) {
 307   std::map<std::string, std::string>::const_iterator it = params.find(key);
 308   if (it == params.end())
 309     return base::EmptyString();
 310
 311   return it->second;
 312 }
 313
 314 }  // namespace
 315
 316 class IOThread::LoggingNetworkChangeObserver
 317     : public net::NetworkChangeNotifier::IPAddressObserver,
 318       public net::NetworkChangeNotifier::ConnectionTypeObserver,
 319       public net::NetworkChangeNotifier::NetworkChangeObserver {
 320  public:
 321   // |net_log| must remain valid throughout our lifetime.
 322   explicit LoggingNetworkChangeObserver(net::NetLog* net_log)
 323       : net_log_(net_log) {
 324     net::NetworkChangeNotifier::AddIPAddressObserver(this);
 325     net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
 326     net::NetworkChangeNotifier::AddNetworkChangeObserver(this);
 327   }
 328
 329   virtual ~LoggingNetworkChangeObserver() {
 330     net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
 331     net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
 332     net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
 333   }
 334
 335   // NetworkChangeNotifier::IPAddressObserver implementation.
 336   virtual void OnIPAddressChanged() OVERRIDE {
 337     VLOG(1) << "Observed a change to the network IP addresses";
 338
 339     net_log_->AddGlobalEntry(net::NetLog::TYPE_NETWORK_IP_ADDRESSES_CHANGED);
 340   }
 341
 342   // NetworkChangeNotifier::ConnectionTypeObserver implementation.
 343   virtual void OnConnectionTypeChanged(
 344       net::NetworkChangeNotifier::ConnectionType type) OVERRIDE {
 345     std::string type_as_string =
 346         net::NetworkChangeNotifier::ConnectionTypeToString(type);
 347
 348     VLOG(1) << "Observed a change to network connectivity state "
 349             << type_as_string;
 350
 351     net_log_->AddGlobalEntry(
 352         net::NetLog::TYPE_NETWORK_CONNECTIVITY_CHANGED,
 353         net::NetLog::StringCallback("new_connection_type", &type_as_string));
 354   }
 355
 356   // NetworkChangeNotifier::NetworkChangeObserver implementation.
 357   virtual void OnNetworkChanged(
 358       net::NetworkChangeNotifier::ConnectionType type) OVERRIDE {
 359     std::string type_as_string =
 360         net::NetworkChangeNotifier::ConnectionTypeToString(type);
 361
 362     VLOG(1) << "Observed a network change to state " << type_as_string;
 363
 364     net_log_->AddGlobalEntry(
 365         net::NetLog::TYPE_NETWORK_CHANGED,
 366         net::NetLog::StringCallback("new_connection_type", &type_as_string));
 367   }
 368
 369  private:
 370   net::NetLog* net_log_;
 371   DISALLOW_COPY_AND_ASSIGN(LoggingNetworkChangeObserver);
 372 };
 373
 374 class SystemURLRequestContextGetter : public net::URLRequestContextGetter {
 375  public:
 376   explicit SystemURLRequestContextGetter(IOThread* io_thread);
 377
 378   // Implementation for net::UrlRequestContextGetter.
 379   virtual net::URLRequestContext* GetURLRequestContext() OVERRIDE;
 380   virtual scoped_refptr<base::SingleThreadTaskRunner>
 381       GetNetworkTaskRunner() const OVERRIDE;
 382
 383  protected:
 384   virtual ~SystemURLRequestContextGetter();
 385
 386  private:
 387   IOThread* const io_thread_;  // Weak pointer, owned by BrowserProcess.
 388   scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
 389
 390   base::debug::LeakTracker<SystemURLRequestContextGetter> leak_tracker_;
 391 };
 392
 393 SystemURLRequestContextGetter::SystemURLRequestContextGetter(
 394     IOThread* io_thread)
 395     : io_thread_(io_thread),
 396       network_task_runner_(
 397           BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO)) {
 398 }
 399
 400 SystemURLRequestContextGetter::~SystemURLRequestContextGetter() {}
 401
 402 net::URLRequestContext* SystemURLRequestContextGetter::GetURLRequestContext() {
 403   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 404   DCHECK(io_thread_->globals()->system_request_context.get());
 405
 406   return io_thread_->globals()->system_request_context.get();
 407 }
 408
 409 scoped_refptr<base::SingleThreadTaskRunner>
 410 SystemURLRequestContextGetter::GetNetworkTaskRunner() const {
 411   return network_task_runner_;
 412 }
 413
 414 IOThread::Globals::
 415 SystemRequestContextLeakChecker::SystemRequestContextLeakChecker(
 416     Globals* globals)
 417     : globals_(globals) {
 418   DCHECK(globals_);
 419 }
 420
 421 IOThread::Globals::
 422 SystemRequestContextLeakChecker::~SystemRequestContextLeakChecker() {
 423   if (globals_->system_request_context.get())
 424     globals_->system_request_context->AssertNoURLRequests();
 425 }
 426
 427 IOThread::Globals::Globals()
 428     : system_request_context_leak_checker(this),
 429       ignore_certificate_errors(false),
 430       testing_fixed_http_port(0),
 431       testing_fixed_https_port(0),
 432       enable_user_alternate_protocol_ports(false) {
 433 }
 434
 435 IOThread::Globals::~Globals() {}
 436
 437 // |local_state| is passed in explicitly in order to (1) reduce implicit
 438 // dependencies and (2) make IOThread more flexible for testing.
 439 IOThread::IOThread(
 440     PrefService* local_state,
 441     policy::PolicyService* policy_service,
 442     ChromeNetLog* net_log,
 443     extensions::EventRouterForwarder* extension_event_router_forwarder)
 444     : net_log_(net_log),
 445       extension_event_router_forwarder_(extension_event_router_forwarder),
 446       globals_(NULL),
 447       is_spdy_disabled_by_policy_(false),
 448       weak_factory_(this),
 449       creation_time_(base::TimeTicks::Now()) {
 450   auth_schemes_ = local_state->GetString(prefs::kAuthSchemes);
 451   negotiate_disable_cname_lookup_ = local_state->GetBoolean(
 452       prefs::kDisableAuthNegotiateCnameLookup);
 453   negotiate_enable_port_ = local_state->GetBoolean(
 454       prefs::kEnableAuthNegotiatePort);
 455   auth_server_whitelist_ = local_state->GetString(prefs::kAuthServerWhitelist);
 456   auth_delegate_whitelist_ = local_state->GetString(
 457       prefs::kAuthNegotiateDelegateWhitelist);
 458   gssapi_library_name_ = local_state->GetString(prefs::kGSSAPILibraryName);
 459   pref_proxy_config_tracker_.reset(
 460       ProxyServiceFactory::CreatePrefProxyConfigTrackerOfLocalState(
 461           local_state));
 462   ChromeNetworkDelegate::InitializePrefsOnUIThread(
 463       &system_enable_referrers_,
 464       NULL,
 465       NULL,
 466       local_state);
 467   ssl_config_service_manager_.reset(
 468       SSLConfigServiceManager::CreateDefaultManager(local_state));
 469
 470   base::Value* dns_client_enabled_default = new base::FundamentalValue(
 471       chrome_browser_net::ConfigureAsyncDnsFieldTrial());
 472   local_state->SetDefaultPrefValue(prefs::kBuiltInDnsClientEnabled,
 473                                    dns_client_enabled_default);
 474
 475   dns_client_enabled_.Init(prefs::kBuiltInDnsClientEnabled,
 476                            local_state,
 477                            base::Bind(&IOThread::UpdateDnsClientEnabled,
 478                                       base::Unretained(this)));
 479   dns_client_enabled_.MoveToThread(
 480       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 481
 482   quick_check_enabled_.Init(prefs::kQuickCheckEnabled,
 483                             local_state);
 484   quick_check_enabled_.MoveToThread(
 485       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 486
 487 #if defined(ENABLE_CONFIGURATION_POLICY)
 488   is_spdy_disabled_by_policy_ = policy_service->GetPolicies(
 489       policy::PolicyNamespace(policy::POLICY_DOMAIN_CHROME, std::string())).Get(
 490           policy::key::kDisableSpdy) != NULL;
 491 #endif  // ENABLE_CONFIGURATION_POLICY
 492
 493   BrowserThread::SetDelegate(BrowserThread::IO, this);
 494 }
 495
 496 IOThread::~IOThread() {
 497   // This isn't needed for production code, but in tests, IOThread may
 498   // be multiply constructed.
 499   BrowserThread::SetDelegate(BrowserThread::IO, NULL);
 500
 501   pref_proxy_config_tracker_->DetachFromPrefService();
 502   DCHECK(!globals_);
 503 }
 504
 505 IOThread::Globals* IOThread::globals() {
 506   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 507   return globals_;
 508 }
 509
 510 void IOThread::SetGlobalsForTesting(Globals* globals) {
 511   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 512   DCHECK(!globals || !globals_);
 513   globals_ = globals;
 514 }
 515
 516 ChromeNetLog* IOThread::net_log() {
 517   return net_log_;
 518 }
 519
 520 void IOThread::ChangedToOnTheRecord() {
 521   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 522   BrowserThread::PostTask(
 523       BrowserThread::IO,
 524       FROM_HERE,
 525       base::Bind(&IOThread::ChangedToOnTheRecordOnIOThread,
 526                  base::Unretained(this)));
 527 }
 528
 529 net::URLRequestContextGetter* IOThread::system_url_request_context_getter() {
 530   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 531   if (!system_url_request_context_getter_.get()) {
 532     InitSystemRequestContext();
 533   }
 534   return system_url_request_context_getter_.get();
 535 }
 536
 537 void IOThread::Init() {
 538   // Prefer to use InitAsync unless you need initialization to block
 539   // the UI thread
 540 }
 541
 542 void IOThread::InitAsync() {
 543   TRACE_EVENT0("startup", "IOThread::InitAsync");
 544   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 545
 546 #if defined(USE_NSS) || defined(OS_IOS)
 547   net::SetMessageLoopForNSSHttpIO();
 548 #endif
 549
 550   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 551
 552   DCHECK(!globals_);
 553   globals_ = new Globals;
 554
 555   // Add an observer that will emit network change events to the ChromeNetLog.
 556   // Assuming NetworkChangeNotifier dispatches in FIFO order, we should be
 557   // logging the network change before other IO thread consumers respond to it.
 558   network_change_observer_.reset(
 559       new LoggingNetworkChangeObserver(net_log_));
 560
 561   // Setup the HistogramWatcher to run on the IO thread.
 562   net::NetworkChangeNotifier::InitHistogramWatcher();
 563
 564   globals_->extension_event_router_forwarder =
 565       extension_event_router_forwarder_;
 566   ChromeNetworkDelegate* network_delegate =
 567       new ChromeNetworkDelegate(extension_event_router_forwarder_,
 568                                 &system_enable_referrers_);
 569   if (command_line.HasSwitch(switches::kEnableClientHints))
 570     network_delegate->SetEnableClientHints();
 571   if (command_line.HasSwitch(switches::kDisableExtensionsHttpThrottling))
 572     network_delegate->NeverThrottleRequests();
 573   globals_->system_network_delegate.reset(network_delegate);
 574   globals_->host_resolver = CreateGlobalHostResolver(net_log_);
 575   UpdateDnsClientEnabled();
 576 #if defined(OS_CHROMEOS)
 577   // Creates a CertVerifyProc that doesn't allow any profile-provided certs.
 578   globals_->cert_verifier.reset(new net::MultiThreadedCertVerifier(
 579       new chromeos::CertVerifyProcChromeOS()));
 580 #else
 581     globals_->cert_verifier.reset(new net::MultiThreadedCertVerifier(
 582         net::CertVerifyProc::CreateDefault()));
 583 #endif
 584
 585     globals_->transport_security_state.reset(new net::TransportSecurityState());
 586 #if !defined(USE_OPENSSL)
 587   // For now, Certificate Transparency is only implemented for platforms
 588   // that use NSS.
 589   net::MultiLogCTVerifier* ct_verifier = new net::MultiLogCTVerifier();
 590   globals_->cert_transparency_verifier.reset(ct_verifier);
 591
 592   // Add built-in logs
 593   ct_verifier->AddLogs(net::ct::CreateLogVerifiersForKnownLogs());
 594
 595   // Add logs from command line
 596   if (command_line.HasSwitch(switches::kCertificateTransparencyLog)) {
 597     std::string switch_value = command_line.GetSwitchValueASCII(
 598         switches::kCertificateTransparencyLog);
 599     std::vector<std::string> logs;
 600     base::SplitString(switch_value, ',', &logs);
 601     for (std::vector<std::string>::iterator it = logs.begin(); it != logs.end();
 602          ++it) {
 603       const std::string& curr_log = *it;
 604       size_t delim_pos = curr_log.find(":");
 605       CHECK(delim_pos != std::string::npos)
 606           << "CT log description not provided (switch format"
 607              " is 'description:base64_key')";
 608       std::string log_description(curr_log.substr(0, delim_pos));
 609       std::string ct_public_key_data;
 610       CHECK(base::Base64Decode(curr_log.substr(delim_pos + 1),
 611                                &ct_public_key_data))
 612           << "Unable to decode CT public key.";
 613       scoped_ptr<net::CTLogVerifier> external_log_verifier(
 614           net::CTLogVerifier::Create(ct_public_key_data, log_description));
 615       CHECK(external_log_verifier) << "Unable to parse CT public key.";
 616       VLOG(1) << "Adding log with description " << log_description;
 617       ct_verifier->AddLog(external_log_verifier.Pass());
 618     }
 619   }
 620 #else
 621   if (command_line.HasSwitch(switches::kCertificateTransparencyLog)) {
 622     LOG(DFATAL) << "Certificate Transparency is not yet supported in Chrome "
 623                    "builds using OpenSSL.";
 624   }
 625 #endif
 626   globals_->ssl_config_service = GetSSLConfigService();
 627 #if defined(OS_ANDROID) || defined(OS_IOS)
 628 #if defined(SPDY_PROXY_AUTH_ORIGIN)
 629   int drp_flags = DataReductionProxyParams::kFallbackAllowed;
 630   if (DataReductionProxyParams::IsIncludedInFieldTrial())
 631     drp_flags |= DataReductionProxyParams::kAllowed;
 632   if (DataReductionProxyParams::IsIncludedInAlternativeFieldTrial())
 633     drp_flags |= DataReductionProxyParams::kAlternativeAllowed;
 634   if (DataReductionProxyParams::IsIncludedInPromoFieldTrial())
 635     drp_flags |= DataReductionProxyParams::kPromoAllowed;
 636   DataReductionProxyParams* proxy_params =
 637       new DataReductionProxyParams(drp_flags);
 638   globals_->data_reduction_proxy_params.reset(proxy_params);
 639   globals_->data_reduction_proxy_auth_request_handler.reset(
 640       new DataReductionProxyAuthRequestHandler(proxy_params));
 641   DataReductionProxyUsageStats* proxy_usage_stats =
 642       new DataReductionProxyUsageStats(proxy_params,
 643           BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI),
 644           BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 645   network_delegate->set_data_reduction_proxy_params(proxy_params);
 646   globals_->data_reduction_proxy_usage_stats.reset(proxy_usage_stats);
 647   network_delegate->set_data_reduction_proxy_usage_stats(proxy_usage_stats);
 648   network_delegate->set_data_reduction_proxy_auth_request_handler(
 649       globals_->data_reduction_proxy_auth_request_handler.get());
 650 #endif  // defined(SPDY_PROXY_AUTH_ORIGIN)
 651 #endif  // defined(OS_ANDROID) || defined(OS_IOS)
 652   globals_->http_auth_handler_factory.reset(CreateDefaultAuthHandlerFactory(
 653       globals_->host_resolver.get()));
 654   globals_->http_server_properties.reset(new net::HttpServerPropertiesImpl());
 655   // For the ProxyScriptFetcher, we use a direct ProxyService.
 656   globals_->proxy_script_fetcher_proxy_service.reset(
 657       net::ProxyService::CreateDirectWithNetLog(net_log_));
 658   // In-memory cookie store.
 659   globals_->system_cookie_store =
 660         content::CreateCookieStore(content::CookieStoreConfig());
 661   // In-memory server bound cert store.
 662   globals_->system_server_bound_cert_service.reset(
 663       new net::ServerBoundCertService(
 664           new net::DefaultServerBoundCertStore(NULL),
 665           base::WorkerPool::GetTaskRunner(true)));
 666   globals_->dns_probe_service.reset(new chrome_browser_net::DnsProbeService());
 667   globals_->host_mapping_rules.reset(new net::HostMappingRules());
 668   globals_->http_user_agent_settings.reset(
 669       new net::StaticHttpUserAgentSettings(std::string(), GetUserAgent()));
 670   if (command_line.HasSwitch(switches::kHostRules)) {
 671     TRACE_EVENT_BEGIN0("startup", "IOThread::InitAsync:SetRulesFromString");
 672     globals_->host_mapping_rules->SetRulesFromString(
 673         command_line.GetSwitchValueASCII(switches::kHostRules));
 674     TRACE_EVENT_END0("startup", "IOThread::InitAsync:SetRulesFromString");
 675   }
 676   if (command_line.HasSwitch(switches::kIgnoreCertificateErrors))
 677     globals_->ignore_certificate_errors = true;
 678   if (command_line.HasSwitch(switches::kTestingFixedHttpPort)) {
 679     globals_->testing_fixed_http_port =
 680         GetSwitchValueAsInt(command_line, switches::kTestingFixedHttpPort);
 681   }
 682   if (command_line.HasSwitch(switches::kTestingFixedHttpsPort)) {
 683     globals_->testing_fixed_https_port =
 684         GetSwitchValueAsInt(command_line, switches::kTestingFixedHttpsPort);
 685   }
 686   ConfigureQuic(command_line);
 687   if (command_line.HasSwitch(
 688           switches::kEnableUserAlternateProtocolPorts)) {
 689     globals_->enable_user_alternate_protocol_ports = true;
 690   }
 691   InitializeNetworkOptions(command_line);
 692
 693   net::HttpNetworkSession::Params session_params;
 694   InitializeNetworkSessionParams(&session_params);
 695   session_params.net_log = net_log_;
 696   session_params.proxy_service =
 697       globals_->proxy_script_fetcher_proxy_service.get();
 698
 699   TRACE_EVENT_BEGIN0("startup", "IOThread::InitAsync:HttpNetworkSession");
 700   scoped_refptr<net::HttpNetworkSession> network_session(
 701       new net::HttpNetworkSession(session_params));
 702   globals_->proxy_script_fetcher_http_transaction_factory
 703       .reset(new net::HttpNetworkLayer(network_session.get()));
 704   TRACE_EVENT_END0("startup", "IOThread::InitAsync:HttpNetworkSession");
 705   scoped_ptr<net::URLRequestJobFactoryImpl> job_factory(
 706       new net::URLRequestJobFactoryImpl());
 707   job_factory->SetProtocolHandler(url::kDataScheme,
 708                                   new net::DataProtocolHandler());
 709   job_factory->SetProtocolHandler(
 710       url::kFileScheme,
 711       new net::FileProtocolHandler(
 712           content::BrowserThread::GetBlockingPool()->
 713               GetTaskRunnerWithShutdownBehavior(
 714                   base::SequencedWorkerPool::SKIP_ON_SHUTDOWN)));
 715 #if !defined(DISABLE_FTP_SUPPORT)
 716   globals_->proxy_script_fetcher_ftp_transaction_factory.reset(
 717       new net::FtpNetworkLayer(globals_->host_resolver.get()));
 718   job_factory->SetProtocolHandler(
 719       url::kFtpScheme,
 720       new net::FtpProtocolHandler(
 721           globals_->proxy_script_fetcher_ftp_transaction_factory.get()));
 722 #endif
 723   globals_->proxy_script_fetcher_url_request_job_factory =
 724       job_factory.PassAs<net::URLRequestJobFactory>();
 725
 726   globals_->throttler_manager.reset(new net::URLRequestThrottlerManager());
 727   globals_->throttler_manager->set_net_log(net_log_);
 728   // Always done in production, disabled only for unit tests.
 729   globals_->throttler_manager->set_enable_thread_checks(true);
 730
 731   globals_->proxy_script_fetcher_context.reset(
 732       ConstructProxyScriptFetcherContext(globals_, net_log_));
 733
 734 #if defined(OS_MACOSX) && !defined(OS_IOS)
 735   // Start observing Keychain events. This needs to be done on the UI thread,
 736   // as Keychain services requires a CFRunLoop.
 737   BrowserThread::PostTask(BrowserThread::UI,
 738                           FROM_HERE,
 739                           base::Bind(&ObserveKeychainEvents));
 740 #endif
 741
 742   // InitSystemRequestContext turns right around and posts a task back
 743   // to the IO thread, so we can't let it run until we know the IO
 744   // thread has started.
 745   //
 746   // Note that since we are at BrowserThread::Init time, the UI thread
 747   // is blocked waiting for the thread to start.  Therefore, posting
 748   // this task to the main thread's message loop here is guaranteed to
 749   // get it onto the message loop while the IOThread object still
 750   // exists.  However, the message might not be processed on the UI
 751   // thread until after IOThread is gone, so use a weak pointer.
 752   BrowserThread::PostTask(BrowserThread::UI,
 753                           FROM_HERE,
 754                           base::Bind(&IOThread::InitSystemRequestContext,
 755                                      weak_factory_.GetWeakPtr()));
 756 }
 757
 758 void IOThread::CleanUp() {
 759   base::debug::LeakTracker<SafeBrowsingURLRequestContext>::CheckForLeaks();
 760
 761 #if defined(USE_NSS) || defined(OS_IOS)
 762   net::ShutdownNSSHttpIO();
 763 #endif
 764
 765   system_url_request_context_getter_ = NULL;
 766
 767   // Release objects that the net::URLRequestContext could have been pointing
 768   // to.
 769
 770   // Shutdown the HistogramWatcher on the IO thread.
 771   net::NetworkChangeNotifier::ShutdownHistogramWatcher();
 772
 773   // This must be reset before the ChromeNetLog is destroyed.
 774   network_change_observer_.reset();
 775
 776   system_proxy_config_service_.reset();
 777
 778   delete globals_;
 779   globals_ = NULL;
 780
 781   base::debug::LeakTracker<SystemURLRequestContextGetter>::CheckForLeaks();
 782 }
 783
 784 void IOThread::InitializeNetworkOptions(const CommandLine& command_line) {
 785   // Only handle use-spdy command line flags if "spdy.disabled" preference is
 786   // not disabled via policy.
 787   if (is_spdy_disabled_by_policy_) {
 788     base::FieldTrial* trial = base::FieldTrialList::Find(kSpdyFieldTrialName);
 789     if (trial)
 790       trial->Disable();
 791   } else {
 792     if (command_line.HasSwitch(switches::kTrustedSpdyProxy)) {
 793       globals_->trusted_spdy_proxy.set(
 794           command_line.GetSwitchValueASCII(switches::kTrustedSpdyProxy));
 795     }
 796     if (command_line.HasSwitch(switches::kIgnoreUrlFetcherCertRequests))
 797       net::URLFetcher::SetIgnoreCertificateRequests(true);
 798
 799     if (command_line.HasSwitch(switches::kUseSpdy)) {
 800       std::string spdy_mode =
 801           command_line.GetSwitchValueASCII(switches::kUseSpdy);
 802       EnableSpdy(spdy_mode);
 803     } else if (command_line.HasSwitch(switches::kEnableSpdy4)) {
 804       globals_->next_protos = net::NextProtosSpdy4Http2();
 805       globals_->use_alternate_protocols.set(true);
 806     } else if (command_line.HasSwitch(switches::kDisableSpdy31)) {
 807       globals_->next_protos = net::NextProtosSpdy3();
 808       globals_->use_alternate_protocols.set(true);
 809     } else if (command_line.HasSwitch(switches::kEnableNpnHttpOnly)) {
 810       globals_->next_protos = net::NextProtosHttpOnly();
 811       globals_->use_alternate_protocols.set(false);
 812     } else if (command_line.HasSwitch(switches::kEnableWebSocketOverSpdy)) {
 813       // Use the current SPDY default (SPDY/3.1).
 814       globals_->next_protos = net::NextProtosSpdy31();
 815       globals_->use_alternate_protocols.set(true);
 816     } else {
 817       // No SPDY command-line flags have been specified. Examine trial groups.
 818       ConfigureSpdyFromTrial(
 819           base::FieldTrialList::FindFullName(kSpdyFieldTrialName), globals_);
 820     }
 821
 822     if (command_line.HasSwitch(switches::kEnableWebSocketOverSpdy))
 823       globals_->enable_websocket_over_spdy.set(true);
 824   }
 825
 826   // TODO(rch): Make the client socket factory a per-network session
 827   // instance, constructed from a NetworkSession::Params, to allow us
 828   // to move this option to IOThread::Globals &
 829   // HttpNetworkSession::Params.
 830   if (command_line.HasSwitch(switches::kEnableTcpFastOpen))
 831     net::SetTCPFastOpenEnabled(true);
 832 }
 833
 834 void IOThread::ConfigureSpdyFromTrial(const std::string& spdy_trial_group,
 835                                       Globals* globals) {
 836   if (spdy_trial_group == kSpdyFieldTrialHoldbackGroupName) {
 837     // TODO(jgraettinger): Use net::NextProtosHttpOnly() instead?
 838     net::HttpStreamFactory::set_spdy_enabled(false);
 839   } else if (spdy_trial_group == kSpdyFieldTrialHoldbackControlGroupName) {
 840     // Use the current SPDY default (SPDY/3.1).
 841     globals->next_protos = net::NextProtosSpdy31();
 842     globals->use_alternate_protocols.set(true);
 843   } else if (spdy_trial_group == kSpdyFieldTrialSpdy4GroupName) {
 844     globals->next_protos = net::NextProtosSpdy4Http2();
 845     globals->use_alternate_protocols.set(true);
 846   } else if (spdy_trial_group == kSpdyFieldTrialSpdy4ControlGroupName) {
 847     // This control group is pinned at SPDY/3.1.
 848     globals->next_protos = net::NextProtosSpdy31();
 849     globals->use_alternate_protocols.set(true);
 850   } else {
 851     // Use the current SPDY default (SPDY/3.1).
 852     globals->next_protos = net::NextProtosSpdy31();
 853     globals->use_alternate_protocols.set(true);
 854   }
 855 }
 856
 857 void IOThread::EnableSpdy(const std::string& mode) {
 858   static const char kOff[] = "off";
 859   static const char kSSL[] = "ssl";
 860   static const char kDisableSSL[] = "no-ssl";
 861   static const char kDisablePing[] = "no-ping";
 862   static const char kExclude[] = "exclude";  // Hosts to exclude
 863   static const char kDisableCompression[] = "no-compress";
 864   static const char kDisableAltProtocols[] = "no-alt-protocols";
 865   static const char kForceAltProtocols[] = "force-alt-protocols";
 866   static const char kSingleDomain[] = "single-domain";
 867
 868   static const char kInitialMaxConcurrentStreams[] = "init-max-streams";
 869
 870   std::vector<std::string> spdy_options;
 871   base::SplitString(mode, ',', &spdy_options);
 872
 873   for (std::vector<std::string>::iterator it = spdy_options.begin();
 874        it != spdy_options.end(); ++it) {
 875     const std::string& element = *it;
 876     std::vector<std::string> name_value;
 877     base::SplitString(element, '=', &name_value);
 878     const std::string& option =
 879         name_value.size() > 0 ? name_value[0] : std::string();
 880     const std::string value =
 881         name_value.size() > 1 ? name_value[1] : std::string();
 882
 883     if (option == kOff) {
 884       net::HttpStreamFactory::set_spdy_enabled(false);
 885     } else if (option == kDisableSSL) {
 886       globals_->spdy_default_protocol.set(net::kProtoSPDY3);
 887       globals_->force_spdy_over_ssl.set(false);
 888       globals_->force_spdy_always.set(true);
 889     } else if (option == kSSL) {
 890       globals_->spdy_default_protocol.set(net::kProtoSPDY3);
 891       globals_->force_spdy_over_ssl.set(true);
 892       globals_->force_spdy_always.set(true);
 893     } else if (option == kDisablePing) {
 894       globals_->enable_spdy_ping_based_connection_checking.set(false);
 895     } else if (option == kExclude) {
 896       globals_->forced_spdy_exclusions.insert(
 897           net::HostPortPair::FromURL(GURL(value)));
 898     } else if (option == kDisableCompression) {
 899       globals_->enable_spdy_compression.set(false);
 900     } else if (option == kDisableAltProtocols) {
 901       globals_->use_alternate_protocols.set(false);
 902     } else if (option == kForceAltProtocols) {
 903       net::AlternateProtocolInfo pair(443, net::NPN_SPDY_3, 1);
 904       net::HttpServerPropertiesImpl::ForceAlternateProtocol(pair);
 905     } else if (option == kSingleDomain) {
 906       DVLOG(1) << "FORCING SINGLE DOMAIN";
 907       globals_->force_spdy_single_domain.set(true);
 908     } else if (option == kInitialMaxConcurrentStreams) {
 909       int streams;
 910       if (base::StringToInt(value, &streams))
 911         globals_->initial_max_spdy_concurrent_streams.set(streams);
 912     } else if (option.empty() && it == spdy_options.begin()) {
 913       continue;
 914     } else {
 915       LOG(DFATAL) << "Unrecognized spdy option: " << option;
 916     }
 917   }
 918 }
 919
 920 // static
 921 void IOThread::RegisterPrefs(PrefRegistrySimple* registry) {
 922   registry->RegisterStringPref(prefs::kAuthSchemes,
 923                                "basic,digest,ntlm,negotiate,"
 924                                "spdyproxy");
 925   registry->RegisterBooleanPref(prefs::kDisableAuthNegotiateCnameLookup, false);
 926   registry->RegisterBooleanPref(prefs::kEnableAuthNegotiatePort, false);
 927   registry->RegisterStringPref(prefs::kAuthServerWhitelist, std::string());
 928   registry->RegisterStringPref(prefs::kAuthNegotiateDelegateWhitelist,
 929                                std::string());
 930   registry->RegisterStringPref(prefs::kGSSAPILibraryName, std::string());
 931   registry->RegisterStringPref(
 932       data_reduction_proxy::prefs::kDataReductionProxy, std::string());
 933   registry->RegisterBooleanPref(prefs::kEnableReferrers, true);
 934   data_reduction_proxy::RegisterPrefs(registry);
 935   registry->RegisterBooleanPref(prefs::kBuiltInDnsClientEnabled, true);
 936   registry->RegisterBooleanPref(prefs::kQuickCheckEnabled, true);
 937 }
 938
 939 net::HttpAuthHandlerFactory* IOThread::CreateDefaultAuthHandlerFactory(
 940     net::HostResolver* resolver) {
 941   net::HttpAuthFilterWhitelist* auth_filter_default_credentials = NULL;
 942   if (!auth_server_whitelist_.empty()) {
 943     auth_filter_default_credentials =
 944         new net::HttpAuthFilterWhitelist(auth_server_whitelist_);
 945   }
 946   net::HttpAuthFilterWhitelist* auth_filter_delegate = NULL;
 947   if (!auth_delegate_whitelist_.empty()) {
 948     auth_filter_delegate =
 949         new net::HttpAuthFilterWhitelist(auth_delegate_whitelist_);
 950   }
 951   globals_->url_security_manager.reset(
 952       net::URLSecurityManager::Create(auth_filter_default_credentials,
 953                                       auth_filter_delegate));
 954   std::vector<std::string> supported_schemes;
 955   base::SplitString(auth_schemes_, ',', &supported_schemes);
 956
 957   scoped_ptr<net::HttpAuthHandlerRegistryFactory> registry_factory(
 958       net::HttpAuthHandlerRegistryFactory::Create(
 959           supported_schemes, globals_->url_security_manager.get(),
 960           resolver, gssapi_library_name_, negotiate_disable_cname_lookup_,
 961           negotiate_enable_port_));
 962   return registry_factory.release();
 963 }
 964
 965 void IOThread::ClearHostCache() {
 966   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 967
 968   net::HostCache* host_cache = globals_->host_resolver->GetHostCache();
 969   if (host_cache)
 970     host_cache->clear();
 971 }
 972
 973 void IOThread::InitializeNetworkSessionParams(
 974     net::HttpNetworkSession::Params* params) {
 975   InitializeNetworkSessionParamsFromGlobals(*globals_, params);
 976 }
 977
 978 // static
 979 void IOThread::InitializeNetworkSessionParamsFromGlobals(
 980     const IOThread::Globals& globals,
 981     net::HttpNetworkSession::Params* params) {
 982   params->host_resolver = globals.host_resolver.get();
 983   params->cert_verifier = globals.cert_verifier.get();
 984   params->server_bound_cert_service =
 985       globals.system_server_bound_cert_service.get();
 986   params->transport_security_state = globals.transport_security_state.get();
 987   params->ssl_config_service = globals.ssl_config_service.get();
 988   params->http_auth_handler_factory = globals.http_auth_handler_factory.get();
 989   params->http_server_properties =
 990       globals.http_server_properties->GetWeakPtr();
 991   params->network_delegate = globals.system_network_delegate.get();
 992   params->host_mapping_rules = globals.host_mapping_rules.get();
 993   params->ignore_certificate_errors = globals.ignore_certificate_errors;
 994   params->testing_fixed_http_port = globals.testing_fixed_http_port;
 995   params->testing_fixed_https_port = globals.testing_fixed_https_port;
 996
 997   globals.initial_max_spdy_concurrent_streams.CopyToIfSet(
 998       &params->spdy_initial_max_concurrent_streams);
 999   globals.force_spdy_single_domain.CopyToIfSet(
1000       &params->force_spdy_single_domain);
1001   globals.enable_spdy_compression.CopyToIfSet(
1002       &params->enable_spdy_compression);
1003   globals.enable_spdy_ping_based_connection_checking.CopyToIfSet(
1004       &params->enable_spdy_ping_based_connection_checking);
1005   globals.spdy_default_protocol.CopyToIfSet(
1006       &params->spdy_default_protocol);
1007   params->next_protos = globals.next_protos;
1008   globals.trusted_spdy_proxy.CopyToIfSet(&params->trusted_spdy_proxy);
1009   globals.force_spdy_over_ssl.CopyToIfSet(&params->force_spdy_over_ssl);
1010   globals.force_spdy_always.CopyToIfSet(&params->force_spdy_always);
1011   params->forced_spdy_exclusions = globals.forced_spdy_exclusions;
1012   globals.use_alternate_protocols.CopyToIfSet(
1013       &params->use_alternate_protocols);
1014   globals.alternate_protocol_probability_threshold.CopyToIfSet(
1015       &params->alternate_protocol_probability_threshold);
1016   globals.enable_websocket_over_spdy.CopyToIfSet(
1017       &params->enable_websocket_over_spdy);
1018
1019   globals.enable_quic.CopyToIfSet(&params->enable_quic);
1020   globals.enable_quic_pacing.CopyToIfSet(
1021       &params->enable_quic_pacing);
1022   globals.enable_quic_time_based_loss_detection.CopyToIfSet(
1023       &params->enable_quic_time_based_loss_detection);
1024   globals.enable_quic_port_selection.CopyToIfSet(
1025       &params->enable_quic_port_selection);
1026   globals.quic_max_packet_length.CopyToIfSet(&params->quic_max_packet_length);
1027   globals.quic_user_agent_id.CopyToIfSet(&params->quic_user_agent_id);
1028   globals.quic_supported_versions.CopyToIfSet(
1029       &params->quic_supported_versions);
1030   params->quic_connection_options = globals.quic_connection_options;
1031
1032   globals.origin_to_force_quic_on.CopyToIfSet(
1033       &params->origin_to_force_quic_on);
1034   params->enable_user_alternate_protocol_ports =
1035       globals.enable_user_alternate_protocol_ports;
1036 }
1037
1038 base::TimeTicks IOThread::creation_time() const {
1039   return creation_time_;
1040 }
1041
1042 net::SSLConfigService* IOThread::GetSSLConfigService() {
1043   return ssl_config_service_manager_->Get();
1044 }
1045
1046 void IOThread::ChangedToOnTheRecordOnIOThread() {
1047   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1048
1049   // Clear the host cache to avoid showing entries from the OTR session
1050   // in about:net-internals.
1051   ClearHostCache();
1052 }
1053
1054 void IOThread::InitSystemRequestContext() {
1055   if (system_url_request_context_getter_.get())
1056     return;
1057   // If we're in unit_tests, IOThread may not be run.
1058   if (!BrowserThread::IsMessageLoopValid(BrowserThread::IO))
1059     return;
1060   system_proxy_config_service_.reset(
1061       ProxyServiceFactory::CreateProxyConfigService(
1062           pref_proxy_config_tracker_.get()));
1063   system_url_request_context_getter_ =
1064       new SystemURLRequestContextGetter(this);
1065   // Safe to post an unretained this pointer, since IOThread is
1066   // guaranteed to outlive the IO BrowserThread.
1067   BrowserThread::PostTask(
1068       BrowserThread::IO,
1069       FROM_HERE,
1070       base::Bind(&IOThread::InitSystemRequestContextOnIOThread,
1071                  base::Unretained(this)));
1072 }
1073
1074 void IOThread::InitSystemRequestContextOnIOThread() {
1075   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1076   DCHECK(!globals_->system_proxy_service.get());
1077   DCHECK(system_proxy_config_service_.get());
1078
1079   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
1080   globals_->system_proxy_service.reset(
1081       ProxyServiceFactory::CreateProxyService(
1082           net_log_,
1083           globals_->proxy_script_fetcher_context.get(),
1084           globals_->system_network_delegate.get(),
1085           system_proxy_config_service_.release(),
1086           command_line,
1087           quick_check_enabled_.GetValue()));
1088
1089   net::HttpNetworkSession::Params system_params;
1090   InitializeNetworkSessionParams(&system_params);
1091   system_params.net_log = net_log_;
1092   system_params.proxy_service = globals_->system_proxy_service.get();
1093
1094   globals_->system_http_transaction_factory.reset(
1095       new net::HttpNetworkLayer(
1096           new net::HttpNetworkSession(system_params)));
1097   globals_->system_url_request_job_factory.reset(
1098       new net::URLRequestJobFactoryImpl());
1099   globals_->system_request_context.reset(
1100       ConstructSystemRequestContext(globals_, net_log_));
1101   globals_->system_request_context->set_ssl_config_service(
1102       globals_->ssl_config_service);
1103   globals_->system_request_context->set_http_server_properties(
1104       globals_->http_server_properties->GetWeakPtr());
1105 }
1106
1107 void IOThread::UpdateDnsClientEnabled() {
1108   globals()->host_resolver->SetDnsClientEnabled(*dns_client_enabled_);
1109 }
1110
1111 void IOThread::ConfigureQuic(const CommandLine& command_line) {
1112   // Always fetch the field trial group to ensure it is reported correctly.
1113   // The command line flags will be associated with a group that is reported
1114   // so long as trial is actually queried.
1115   std::string group =
1116       base::FieldTrialList::FindFullName(kQuicFieldTrialName);
1117   VariationParameters params;
1118   if (!chrome_variations::GetVariationParams(kQuicFieldTrialName, &params)) {
1119     params.clear();
1120   }
1121
1122   ConfigureQuicGlobals(command_line, group, params, globals_);
1123 }
1124
1125 // static
1126 void IOThread::ConfigureQuicGlobals(
1127     const base::CommandLine& command_line,
1128     base::StringPiece quic_trial_group,
1129     const VariationParameters& quic_trial_params,
1130     IOThread::Globals* globals) {
1131   bool enable_quic = ShouldEnableQuic(command_line, quic_trial_group);
1132   globals->enable_quic.set(enable_quic);
1133   if (enable_quic) {
1134     globals->enable_quic_pacing.set(
1135         ShouldEnableQuicPacing(command_line, quic_trial_group,
1136                                quic_trial_params));
1137     globals->enable_quic_time_based_loss_detection.set(
1138         ShouldEnableQuicTimeBasedLossDetection(command_line, quic_trial_group,
1139                                                quic_trial_params));
1140     globals->enable_quic_port_selection.set(
1141         ShouldEnableQuicPortSelection(command_line));
1142     globals->quic_connection_options =
1143         GetQuicConnectionOptions(command_line, quic_trial_params);
1144   }
1145
1146   size_t max_packet_length = GetQuicMaxPacketLength(command_line,
1147                                                     quic_trial_group,
1148                                                     quic_trial_params);
1149   if (max_packet_length != 0) {
1150     globals->quic_max_packet_length.set(max_packet_length);
1151   }
1152
1153   std::string quic_user_agent_id =
1154       chrome::VersionInfo::GetVersionStringModifier();
1155   quic_user_agent_id.append(1, ' ');
1156   chrome::VersionInfo version_info;
1157   quic_user_agent_id.append(version_info.ProductNameAndVersionForUserAgent());
1158   globals->quic_user_agent_id.set(quic_user_agent_id);
1159
1160   net::QuicVersion version = GetQuicVersion(command_line, quic_trial_params);
1161   if (version != net::QUIC_VERSION_UNSUPPORTED) {
1162     net::QuicVersionVector supported_versions;
1163     supported_versions.push_back(version);
1164     globals->quic_supported_versions.set(supported_versions);
1165   }
1166
1167   double threshold =
1168       GetAlternateProtocolProbabilityThreshold(command_line, quic_trial_params);
1169   if (threshold >=0 && threshold <= 1) {
1170     globals->alternate_protocol_probability_threshold.set(threshold);
1171     globals->http_server_properties->SetAlternateProtocolProbabilityThreshold(
1172         threshold);
1173   }
1174
1175   if (command_line.HasSwitch(switches::kOriginToForceQuicOn)) {
1176     net::HostPortPair quic_origin =
1177         net::HostPortPair::FromString(
1178             command_line.GetSwitchValueASCII(switches::kOriginToForceQuicOn));
1179     if (!quic_origin.IsEmpty()) {
1180       globals->origin_to_force_quic_on.set(quic_origin);
1181     }
1182   }
1183 }
1184
1185 bool IOThread::ShouldEnableQuic(const CommandLine& command_line,
1186                                 base::StringPiece quic_trial_group) {
1187   if (command_line.HasSwitch(switches::kDisableQuic))
1188     return false;
1189
1190   if (command_line.HasSwitch(switches::kEnableQuic))
1191     return true;
1192
1193   return quic_trial_group.starts_with(kQuicFieldTrialEnabledGroupName) ||
1194       quic_trial_group.starts_with(kQuicFieldTrialHttpsEnabledGroupName);
1195 }
1196
1197 bool IOThread::ShouldEnableQuicPortSelection(
1198       const CommandLine& command_line) {
1199   if (command_line.HasSwitch(switches::kDisableQuicPortSelection))
1200     return false;
1201
1202   if (command_line.HasSwitch(switches::kEnableQuicPortSelection))
1203     return true;
1204
1205   return false;  // Default to disabling port selection on all channels.
1206 }
1207
1208 bool IOThread::ShouldEnableQuicPacing(
1209     const CommandLine& command_line,
1210     base::StringPiece quic_trial_group,
1211     const VariationParameters& quic_trial_params) {
1212   if (command_line.HasSwitch(switches::kEnableQuicPacing))
1213     return true;
1214
1215   if (command_line.HasSwitch(switches::kDisableQuicPacing))
1216     return false;
1217
1218   if (LowerCaseEqualsASCII(
1219       GetVariationParam(quic_trial_params, "enable_pacing"),
1220       "true"))
1221     return true;
1222
1223   return quic_trial_group.ends_with(kQuicFieldTrialPacingSuffix);
1224 }
1225
1226 net::QuicTagVector IOThread::GetQuicConnectionOptions(
1227     const CommandLine& command_line,
1228     const VariationParameters& quic_trial_params) {
1229   if (command_line.HasSwitch(switches::kQuicConnectionOptions)) {
1230     return ParseQuicConnectionOptions(
1231         command_line.GetSwitchValueASCII(switches::kQuicConnectionOptions));
1232   }
1233
1234   VariationParameters::const_iterator it =
1235       quic_trial_params.find("congestion_options");
1236   if (it == quic_trial_params.end())
1237     return net::QuicTagVector();
1238
1239   return ParseQuicConnectionOptions(it->second);
1240 }
1241
1242 // static
1243 net::QuicTagVector IOThread::ParseQuicConnectionOptions(
1244     const std::string& connection_options) {
1245   net::QuicTagVector options;
1246   std::vector<std::string> tokens;
1247   base::SplitString(connection_options, ',', &tokens);
1248   // Tokens are expected to be no more than 4 characters long, but we
1249   // handle overflow gracefully.
1250   for (std::vector<std::string>::iterator token = tokens.begin();
1251        token != tokens.end(); ++token) {
1252     uint32 option = 0;
1253     for (size_t i = token->length() ; i > 0; --i) {
1254       option <<= 8;
1255       option |= static_cast<unsigned char>((*token)[i - 1]);
1256     }
1257     options.push_back(static_cast<net::QuicTag>(option));
1258   }
1259   return options;
1260 }
1261
1262 // static
1263 double IOThread::GetAlternateProtocolProbabilityThreshold(
1264     const base::CommandLine& command_line,
1265     const VariationParameters& quic_trial_params) {
1266   double value;
1267   if (command_line.HasSwitch(
1268           switches::kAlternateProtocolProbabilityThreshold)) {
1269     if (base::StringToDouble(
1270             command_line.GetSwitchValueASCII(
1271                 switches::kAlternateProtocolProbabilityThreshold),
1272             &value)) {
1273       return value;
1274     }
1275   }
1276   if (base::StringToDouble(
1277           GetVariationParam(quic_trial_params,
1278                             "alternate_protocol_probability_threshold"),
1279           &value)) {
1280     return value;
1281   }
1282   return -1;
1283 }
1284
1285 // static
1286 bool IOThread::ShouldEnableQuicTimeBasedLossDetection(
1287     const CommandLine& command_line,
1288     base::StringPiece quic_trial_group,
1289     const VariationParameters& quic_trial_params) {
1290   if (command_line.HasSwitch(switches::kEnableQuicTimeBasedLossDetection))
1291     return true;
1292
1293   if (command_line.HasSwitch(switches::kDisableQuicTimeBasedLossDetection))
1294     return false;
1295
1296   if (LowerCaseEqualsASCII(
1297       GetVariationParam(quic_trial_params, "enable_time_based_loss_detection"),
1298       "true"))
1299     return true;
1300
1301   return quic_trial_group.ends_with(
1302       kQuicFieldTrialTimeBasedLossDetectionSuffix);
1303 }
1304
1305 // static
1306 size_t IOThread::GetQuicMaxPacketLength(
1307     const CommandLine& command_line,
1308     base::StringPiece quic_trial_group,
1309     const VariationParameters& quic_trial_params) {
1310   if (command_line.HasSwitch(switches::kQuicMaxPacketLength)) {
1311     unsigned value;
1312     if (!base::StringToUint(
1313             command_line.GetSwitchValueASCII(switches::kQuicMaxPacketLength),
1314             &value)) {
1315       return 0;
1316     }
1317     return value;
1318   }
1319
1320   unsigned value;
1321   if (base::StringToUint(GetVariationParam(quic_trial_params,
1322                                            "max_packet_length"),
1323                          &value)) {
1324     return value;
1325   }
1326
1327   // Format of the packet length group names is:
1328   //   (Https)?Enabled<length>BytePackets.
1329   base::StringPiece length_str(quic_trial_group);
1330   if (length_str.starts_with(kQuicFieldTrialEnabledGroupName)) {
1331     length_str.remove_prefix(strlen(kQuicFieldTrialEnabledGroupName));
1332   } else if (length_str.starts_with(kQuicFieldTrialHttpsEnabledGroupName)) {
1333     length_str.remove_prefix(strlen(kQuicFieldTrialHttpsEnabledGroupName));
1334   } else {
1335     return 0;
1336   }
1337   if (!length_str.ends_with(kQuicFieldTrialPacketLengthSuffix)) {
1338     return 0;
1339   }
1340   length_str.remove_suffix(strlen(kQuicFieldTrialPacketLengthSuffix));
1341   if (!base::StringToUint(length_str, &value)) {
1342     return 0;
1343   }
1344   return value;
1345 }
1346
1347 // static
1348 net::QuicVersion IOThread::GetQuicVersion(
1349     const CommandLine& command_line,
1350     const VariationParameters& quic_trial_params) {
1351   if (command_line.HasSwitch(switches::kQuicVersion)) {
1352     return ParseQuicVersion(
1353         command_line.GetSwitchValueASCII(switches::kQuicVersion));
1354   }
1355
1356   return ParseQuicVersion(GetVariationParam(quic_trial_params, "quic_version"));
1357 }
1358
1359 // static
1360 net::QuicVersion IOThread::ParseQuicVersion(const std::string& quic_version) {
1361   net::QuicVersionVector supported_versions = net::QuicSupportedVersions();
1362   for (size_t i = 0; i < supported_versions.size(); ++i) {
1363     net::QuicVersion version = supported_versions[i];
1364     if (net::QuicVersionToString(version) == quic_version) {
1365       return version;
1366     }
1367   }
1368
1369   return net::QUIC_VERSION_UNSUPPORTED;
1370 }