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/net/async_dns_field_trial.h"
  31 #include "chrome/browser/net/chrome_net_log.h"
  32 #include "chrome/browser/net/chrome_network_delegate.h"
  33 #include "chrome/browser/net/connect_interceptor.h"
  34 #include "chrome/browser/net/dns_probe_service.h"
  35 #include "chrome/browser/net/pref_proxy_config_tracker.h"
  36 #include "chrome/browser/net/proxy_service_factory.h"
  37 #include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.h"
  38 #include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings_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/core/browser/data_reduction_proxy_auth_request_handler.h"
  44 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.h"
  45 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_params.h"
  46 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_prefs.h"
  47 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_protocol.h"
  48 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h"
  49 #include "components/policy/core/common/policy_service.h"
  50 #include "components/variations/variations_associated_data.h"
  51 #include "content/public/browser/browser_thread.h"
  52 #include "content/public/browser/cookie_store_factory.h"
  53 #include "net/base/host_mapping_rules.h"
  54 #include "net/base/net_util.h"
  55 #include "net/cert/cert_verifier.h"
  56 #include "net/cert/cert_verify_proc.h"
  57 #include "net/cert/ct_known_logs.h"
  58 #include "net/cert/ct_log_verifier.h"
  59 #include "net/cert/ct_verifier.h"
  60 #include "net/cert/multi_log_ct_verifier.h"
  61 #include "net/cert/multi_threaded_cert_verifier.h"
  62 #include "net/cookies/cookie_store.h"
  63 #include "net/dns/host_cache.h"
  64 #include "net/dns/host_resolver.h"
  65 #include "net/dns/mapped_host_resolver.h"
  66 #include "net/ftp/ftp_network_layer.h"
  67 #include "net/http/http_auth_filter.h"
  68 #include "net/http/http_auth_handler_factory.h"
  69 #include "net/http/http_network_layer.h"
  70 #include "net/http/http_server_properties_impl.h"
  71 #include "net/proxy/proxy_config_service.h"
  72 #include "net/proxy/proxy_script_fetcher_impl.h"
  73 #include "net/proxy/proxy_service.h"
  74 #include "net/quic/crypto/crypto_protocol.h"
  75 #include "net/quic/quic_protocol.h"
  76 #include "net/socket/tcp_client_socket.h"
  77 #include "net/spdy/spdy_session.h"
  78 #include "net/ssl/channel_id_service.h"
  79 #include "net/ssl/default_channel_id_store.h"
  80 #include "net/url_request/data_protocol_handler.h"
  81 #include "net/url_request/file_protocol_handler.h"
  82 #include "net/url_request/ftp_protocol_handler.h"
  83 #include "net/url_request/static_http_user_agent_settings.h"
  84 #include "net/url_request/url_fetcher.h"
  85 #include "net/url_request/url_request_context.h"
  86 #include "net/url_request/url_request_context_getter.h"
  87 #include "net/url_request/url_request_job_factory_impl.h"
  88 #include "net/url_request/url_request_throttler_manager.h"
  89 #include "url/url_constants.h"
  90
  91 #if defined(ENABLE_CONFIGURATION_POLICY)
  92 #include "policy/policy_constants.h"
  93 #endif
  94
  95 #if defined(ENABLE_EXTENSIONS)
  96 #include "chrome/browser/extensions/event_router_forwarder.h"
  97 #endif
  98
  99 #if defined(USE_NSS) || defined(OS_IOS)
 100 #include "net/ocsp/nss_ocsp.h"
 101 #endif
 102
 103 #if defined(OS_CHROMEOS)
 104 #include "chrome/browser/chromeos/net/cert_verify_proc_chromeos.h"
 105 #include "chromeos/network/host_resolver_impl_chromeos.h"
 106 #endif
 107
 108 using content::BrowserThread;
 109
 110 class SafeBrowsingURLRequestContext;
 111
 112 // The IOThread object must outlive any tasks posted to the IO thread before the
 113 // Quit task, so base::Bind() calls are not refcounted.
 114
 115 namespace {
 116
 117 const char kTCPFastOpenFieldTrialName[] = "TCPFastOpen";
 118 const char kTCPFastOpenHttpsEnabledGroupName[] = "HttpsEnabled";
 119
 120 const char kQuicFieldTrialName[] = "QUIC";
 121 const char kQuicFieldTrialEnabledGroupName[] = "Enabled";
 122 const char kQuicFieldTrialHttpsEnabledGroupName[] = "HttpsEnabled";
 123 const char kQuicFieldTrialPacketLengthSuffix[] = "BytePackets";
 124 const char kQuicFieldTrialPacingSuffix[] = "WithPacing";
 125
 126 // The SPDY trial composes two different trial plus control groups:
 127 //  * A "holdback" group with SPDY disabled, and corresponding control
 128 //  (SPDY/3.1). The primary purpose of the holdback group is to encourage site
 129 //  operators to do feature detection rather than UA-sniffing. As such, this
 130 //  trial runs continuously.
 131 //  * A SPDY/4 experiment, for SPDY/4 (aka HTTP/2) vs SPDY/3.1 comparisons and
 132 //  eventual SPDY/4 deployment.
 133 const char kSpdyFieldTrialName[] = "SPDY";
 134 const char kSpdyFieldTrialHoldbackGroupName[] = "SpdyDisabled";
 135 const char kSpdyFieldTrialHoldbackControlGroupName[] = "Control";
 136 const char kSpdyFieldTrialSpdy4GroupName[] = "Spdy4Enabled";
 137 const char kSpdyFieldTrialSpdy4ControlGroupName[] = "Spdy4Control";
 138
 139 // Field trial for Cache-Control: stale-while-revalidate directive.
 140 const char kStaleWhileRevalidateFieldTrialName[] = "StaleWhileRevalidate";
 141
 142 #if defined(OS_MACOSX) && !defined(OS_IOS)
 143 void ObserveKeychainEvents() {
 144   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 145   net::CertDatabase::GetInstance()->SetMessageLoopForKeychainEvents();
 146 }
 147 #endif
 148
 149 // Used for the "system" URLRequestContext.
 150 class SystemURLRequestContext : public net::URLRequestContext {
 151  public:
 152   SystemURLRequestContext() {
 153 #if defined(USE_NSS) || defined(OS_IOS)
 154     net::SetURLRequestContextForNSSHttpIO(this);
 155 #endif
 156   }
 157
 158  private:
 159   virtual ~SystemURLRequestContext() {
 160     AssertNoURLRequests();
 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.Pass();
 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.Pass();
 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_channel_id_service(
 255       globals->system_channel_id_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_channel_id_service(
 284       globals->system_channel_id_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       enable_ssl_connect_job_waiting(false),
 430       ignore_certificate_errors(false),
 431       use_stale_while_revalidate(false),
 432       testing_fixed_http_port(0),
 433       testing_fixed_https_port(0),
 434       enable_user_alternate_protocol_ports(false) {
 435 }
 436
 437 IOThread::Globals::~Globals() {}
 438
 439 // |local_state| is passed in explicitly in order to (1) reduce implicit
 440 // dependencies and (2) make IOThread more flexible for testing.
 441 IOThread::IOThread(
 442     PrefService* local_state,
 443     policy::PolicyService* policy_service,
 444     ChromeNetLog* net_log,
 445     extensions::EventRouterForwarder* extension_event_router_forwarder)
 446     : net_log_(net_log),
 447 #if defined(ENABLE_EXTENSIONS)
 448       extension_event_router_forwarder_(extension_event_router_forwarder),
 449 #endif
 450       globals_(NULL),
 451       is_spdy_disabled_by_policy_(false),
 452       creation_time_(base::TimeTicks::Now()),
 453       weak_factory_(this) {
 454   auth_schemes_ = local_state->GetString(prefs::kAuthSchemes);
 455   negotiate_disable_cname_lookup_ = local_state->GetBoolean(
 456       prefs::kDisableAuthNegotiateCnameLookup);
 457   negotiate_enable_port_ = local_state->GetBoolean(
 458       prefs::kEnableAuthNegotiatePort);
 459   auth_server_whitelist_ = local_state->GetString(prefs::kAuthServerWhitelist);
 460   auth_delegate_whitelist_ = local_state->GetString(
 461       prefs::kAuthNegotiateDelegateWhitelist);
 462   gssapi_library_name_ = local_state->GetString(prefs::kGSSAPILibraryName);
 463   pref_proxy_config_tracker_.reset(
 464       ProxyServiceFactory::CreatePrefProxyConfigTrackerOfLocalState(
 465           local_state));
 466   ChromeNetworkDelegate::InitializePrefsOnUIThread(
 467       &system_enable_referrers_,
 468       NULL,
 469       NULL,
 470       local_state);
 471   ssl_config_service_manager_.reset(
 472       SSLConfigServiceManager::CreateDefaultManager(local_state));
 473
 474   base::Value* dns_client_enabled_default = new base::FundamentalValue(
 475       chrome_browser_net::ConfigureAsyncDnsFieldTrial());
 476   local_state->SetDefaultPrefValue(prefs::kBuiltInDnsClientEnabled,
 477                                    dns_client_enabled_default);
 478
 479   dns_client_enabled_.Init(prefs::kBuiltInDnsClientEnabled,
 480                            local_state,
 481                            base::Bind(&IOThread::UpdateDnsClientEnabled,
 482                                       base::Unretained(this)));
 483   dns_client_enabled_.MoveToThread(
 484       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 485
 486   quick_check_enabled_.Init(prefs::kQuickCheckEnabled,
 487                             local_state);
 488   quick_check_enabled_.MoveToThread(
 489       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 490
 491 #if defined(ENABLE_CONFIGURATION_POLICY)
 492   is_spdy_disabled_by_policy_ = policy_service->GetPolicies(
 493       policy::PolicyNamespace(policy::POLICY_DOMAIN_CHROME, std::string())).Get(
 494           policy::key::kDisableSpdy) != NULL;
 495 #endif  // ENABLE_CONFIGURATION_POLICY
 496
 497   BrowserThread::SetDelegate(BrowserThread::IO, this);
 498 }
 499
 500 IOThread::~IOThread() {
 501   // This isn't needed for production code, but in tests, IOThread may
 502   // be multiply constructed.
 503   BrowserThread::SetDelegate(BrowserThread::IO, NULL);
 504
 505   pref_proxy_config_tracker_->DetachFromPrefService();
 506   DCHECK(!globals_);
 507 }
 508
 509 IOThread::Globals* IOThread::globals() {
 510   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 511   return globals_;
 512 }
 513
 514 void IOThread::SetGlobalsForTesting(Globals* globals) {
 515   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 516   DCHECK(!globals || !globals_);
 517   globals_ = globals;
 518 }
 519
 520 ChromeNetLog* IOThread::net_log() {
 521   return net_log_;
 522 }
 523
 524 void IOThread::ChangedToOnTheRecord() {
 525   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 526   BrowserThread::PostTask(
 527       BrowserThread::IO,
 528       FROM_HERE,
 529       base::Bind(&IOThread::ChangedToOnTheRecordOnIOThread,
 530                  base::Unretained(this)));
 531 }
 532
 533 net::URLRequestContextGetter* IOThread::system_url_request_context_getter() {
 534   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 535   if (!system_url_request_context_getter_.get()) {
 536     InitSystemRequestContext();
 537   }
 538   return system_url_request_context_getter_.get();
 539 }
 540
 541 void IOThread::Init() {
 542   // Prefer to use InitAsync unless you need initialization to block
 543   // the UI thread
 544 }
 545
 546 void IOThread::InitAsync() {
 547   TRACE_EVENT0("startup", "IOThread::InitAsync");
 548   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 549
 550 #if defined(USE_NSS) || defined(OS_IOS)
 551   net::SetMessageLoopForNSSHttpIO();
 552 #endif
 553
 554   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 555
 556   DCHECK(!globals_);
 557   globals_ = new Globals;
 558
 559   // Add an observer that will emit network change events to the ChromeNetLog.
 560   // Assuming NetworkChangeNotifier dispatches in FIFO order, we should be
 561   // logging the network change before other IO thread consumers respond to it.
 562   network_change_observer_.reset(
 563       new LoggingNetworkChangeObserver(net_log_));
 564
 565   // Setup the HistogramWatcher to run on the IO thread.
 566   net::NetworkChangeNotifier::InitHistogramWatcher();
 567
 568 #if defined(ENABLE_EXTENSIONS)
 569   globals_->extension_event_router_forwarder =
 570       extension_event_router_forwarder_;
 571 #endif
 572
 573   ChromeNetworkDelegate* network_delegate =
 574       new ChromeNetworkDelegate(extension_event_router_forwarder(),
 575                                 &system_enable_referrers_);
 576
 577   if (command_line.HasSwitch(switches::kEnableClientHints))
 578     network_delegate->SetEnableClientHints();
 579
 580 #if defined(ENABLE_EXTENSIONS)
 581   if (command_line.HasSwitch(switches::kDisableExtensionsHttpThrottling))
 582     network_delegate->NeverThrottleRequests();
 583 #endif
 584
 585   globals_->system_network_delegate.reset(network_delegate);
 586   globals_->host_resolver = CreateGlobalHostResolver(net_log_);
 587   UpdateDnsClientEnabled();
 588 #if defined(OS_CHROMEOS)
 589   // Creates a CertVerifyProc that doesn't allow any profile-provided certs.
 590   globals_->cert_verifier.reset(new net::MultiThreadedCertVerifier(
 591       new chromeos::CertVerifyProcChromeOS()));
 592 #else
 593   globals_->cert_verifier.reset(new net::MultiThreadedCertVerifier(
 594       net::CertVerifyProc::CreateDefault()));
 595 #endif
 596
 597   globals_->transport_security_state.reset(new net::TransportSecurityState());
 598
 599   net::MultiLogCTVerifier* ct_verifier = new net::MultiLogCTVerifier();
 600   globals_->cert_transparency_verifier.reset(ct_verifier);
 601
 602   // Add built-in logs
 603   ct_verifier->AddLogs(net::ct::CreateLogVerifiersForKnownLogs());
 604
 605   // Add logs from command line
 606   if (command_line.HasSwitch(switches::kCertificateTransparencyLog)) {
 607     std::string switch_value = command_line.GetSwitchValueASCII(
 608         switches::kCertificateTransparencyLog);
 609     std::vector<std::string> logs;
 610     base::SplitString(switch_value, ',', &logs);
 611     for (std::vector<std::string>::iterator it = logs.begin(); it != logs.end();
 612          ++it) {
 613       const std::string& curr_log = *it;
 614       size_t delim_pos = curr_log.find(":");
 615       CHECK(delim_pos != std::string::npos)
 616           << "CT log description not provided (switch format"
 617              " is 'description:base64_key')";
 618       std::string log_description(curr_log.substr(0, delim_pos));
 619       std::string ct_public_key_data;
 620       CHECK(base::Base64Decode(curr_log.substr(delim_pos + 1),
 621                                &ct_public_key_data))
 622           << "Unable to decode CT public key.";
 623       scoped_ptr<net::CTLogVerifier> external_log_verifier(
 624           net::CTLogVerifier::Create(ct_public_key_data, log_description));
 625       CHECK(external_log_verifier) << "Unable to parse CT public key.";
 626       VLOG(1) << "Adding log with description " << log_description;
 627       ct_verifier->AddLog(external_log_verifier.Pass());
 628     }
 629   }
 630
 631   globals_->ssl_config_service = GetSSLConfigService();
 632
 633   SetupDataReductionProxy(network_delegate);
 634
 635   globals_->http_auth_handler_factory.reset(CreateDefaultAuthHandlerFactory(
 636       globals_->host_resolver.get()));
 637   globals_->http_server_properties.reset(new net::HttpServerPropertiesImpl());
 638   // For the ProxyScriptFetcher, we use a direct ProxyService.
 639   globals_->proxy_script_fetcher_proxy_service.reset(
 640       net::ProxyService::CreateDirectWithNetLog(net_log_));
 641   // In-memory cookie store.
 642   globals_->system_cookie_store =
 643         content::CreateCookieStore(content::CookieStoreConfig());
 644   // In-memory channel ID store.
 645   globals_->system_channel_id_service.reset(
 646       new net::ChannelIDService(
 647           new net::DefaultChannelIDStore(NULL),
 648           base::WorkerPool::GetTaskRunner(true)));
 649   globals_->dns_probe_service.reset(new chrome_browser_net::DnsProbeService());
 650   globals_->host_mapping_rules.reset(new net::HostMappingRules());
 651   globals_->http_user_agent_settings.reset(
 652       new net::StaticHttpUserAgentSettings(std::string(), GetUserAgent()));
 653   if (command_line.HasSwitch(switches::kHostRules)) {
 654     TRACE_EVENT_BEGIN0("startup", "IOThread::InitAsync:SetRulesFromString");
 655     globals_->host_mapping_rules->SetRulesFromString(
 656         command_line.GetSwitchValueASCII(switches::kHostRules));
 657     TRACE_EVENT_END0("startup", "IOThread::InitAsync:SetRulesFromString");
 658   }
 659   if (command_line.HasSwitch(switches::kEnableSSLConnectJobWaiting))
 660     globals_->enable_ssl_connect_job_waiting = true;
 661   if (command_line.HasSwitch(switches::kIgnoreCertificateErrors))
 662     globals_->ignore_certificate_errors = true;
 663   if (command_line.HasSwitch(switches::kEnableStaleWhileRevalidate))
 664     globals_->use_stale_while_revalidate = true;
 665   if (base::FieldTrialList::FindFullName(kStaleWhileRevalidateFieldTrialName) ==
 666       "Enabled")
 667     globals_->use_stale_while_revalidate = true;
 668   if (command_line.HasSwitch(switches::kTestingFixedHttpPort)) {
 669     globals_->testing_fixed_http_port =
 670         GetSwitchValueAsInt(command_line, switches::kTestingFixedHttpPort);
 671   }
 672   if (command_line.HasSwitch(switches::kTestingFixedHttpsPort)) {
 673     globals_->testing_fixed_https_port =
 674         GetSwitchValueAsInt(command_line, switches::kTestingFixedHttpsPort);
 675   }
 676   ConfigureQuic(command_line);
 677   if (command_line.HasSwitch(
 678           switches::kEnableUserAlternateProtocolPorts)) {
 679     globals_->enable_user_alternate_protocol_ports = true;
 680   }
 681   InitializeNetworkOptions(command_line);
 682
 683   net::HttpNetworkSession::Params session_params;
 684   InitializeNetworkSessionParams(&session_params);
 685   session_params.net_log = net_log_;
 686   session_params.proxy_service =
 687       globals_->proxy_script_fetcher_proxy_service.get();
 688
 689   TRACE_EVENT_BEGIN0("startup", "IOThread::InitAsync:HttpNetworkSession");
 690   scoped_refptr<net::HttpNetworkSession> network_session(
 691       new net::HttpNetworkSession(session_params));
 692   globals_->proxy_script_fetcher_http_transaction_factory
 693       .reset(new net::HttpNetworkLayer(network_session.get()));
 694   TRACE_EVENT_END0("startup", "IOThread::InitAsync:HttpNetworkSession");
 695   scoped_ptr<net::URLRequestJobFactoryImpl> job_factory(
 696       new net::URLRequestJobFactoryImpl());
 697   job_factory->SetProtocolHandler(url::kDataScheme,
 698                                   new net::DataProtocolHandler());
 699   job_factory->SetProtocolHandler(
 700       url::kFileScheme,
 701       new net::FileProtocolHandler(
 702           content::BrowserThread::GetBlockingPool()->
 703               GetTaskRunnerWithShutdownBehavior(
 704                   base::SequencedWorkerPool::SKIP_ON_SHUTDOWN)));
 705 #if !defined(DISABLE_FTP_SUPPORT)
 706   globals_->proxy_script_fetcher_ftp_transaction_factory.reset(
 707       new net::FtpNetworkLayer(globals_->host_resolver.get()));
 708   job_factory->SetProtocolHandler(
 709       url::kFtpScheme,
 710       new net::FtpProtocolHandler(
 711           globals_->proxy_script_fetcher_ftp_transaction_factory.get()));
 712 #endif
 713   globals_->proxy_script_fetcher_url_request_job_factory = job_factory.Pass();
 714
 715   globals_->throttler_manager.reset(new net::URLRequestThrottlerManager());
 716   globals_->throttler_manager->set_net_log(net_log_);
 717   // Always done in production, disabled only for unit tests.
 718   globals_->throttler_manager->set_enable_thread_checks(true);
 719
 720   globals_->proxy_script_fetcher_context.reset(
 721       ConstructProxyScriptFetcherContext(globals_, net_log_));
 722
 723 #if defined(OS_MACOSX) && !defined(OS_IOS)
 724   // Start observing Keychain events. This needs to be done on the UI thread,
 725   // as Keychain services requires a CFRunLoop.
 726   BrowserThread::PostTask(BrowserThread::UI,
 727                           FROM_HERE,
 728                           base::Bind(&ObserveKeychainEvents));
 729 #endif
 730
 731   // InitSystemRequestContext turns right around and posts a task back
 732   // to the IO thread, so we can't let it run until we know the IO
 733   // thread has started.
 734   //
 735   // Note that since we are at BrowserThread::Init time, the UI thread
 736   // is blocked waiting for the thread to start.  Therefore, posting
 737   // this task to the main thread's message loop here is guaranteed to
 738   // get it onto the message loop while the IOThread object still
 739   // exists.  However, the message might not be processed on the UI
 740   // thread until after IOThread is gone, so use a weak pointer.
 741   BrowserThread::PostTask(BrowserThread::UI,
 742                           FROM_HERE,
 743                           base::Bind(&IOThread::InitSystemRequestContext,
 744                                      weak_factory_.GetWeakPtr()));
 745 }
 746
 747 void IOThread::CleanUp() {
 748   base::debug::LeakTracker<SafeBrowsingURLRequestContext>::CheckForLeaks();
 749
 750 #if defined(USE_NSS) || defined(OS_IOS)
 751   net::ShutdownNSSHttpIO();
 752 #endif
 753
 754   system_url_request_context_getter_ = NULL;
 755
 756   // Release objects that the net::URLRequestContext could have been pointing
 757   // to.
 758
 759   // Shutdown the HistogramWatcher on the IO thread.
 760   net::NetworkChangeNotifier::ShutdownHistogramWatcher();
 761
 762   // This must be reset before the ChromeNetLog is destroyed.
 763   network_change_observer_.reset();
 764
 765   system_proxy_config_service_.reset();
 766
 767   delete globals_;
 768   globals_ = NULL;
 769
 770   base::debug::LeakTracker<SystemURLRequestContextGetter>::CheckForLeaks();
 771 }
 772
 773 void IOThread::InitializeNetworkOptions(const CommandLine& command_line) {
 774   // Only handle use-spdy command line flags if "spdy.disabled" preference is
 775   // not disabled via policy.
 776   if (is_spdy_disabled_by_policy_) {
 777     base::FieldTrial* trial = base::FieldTrialList::Find(kSpdyFieldTrialName);
 778     if (trial)
 779       trial->Disable();
 780   } else {
 781     if (command_line.HasSwitch(switches::kTrustedSpdyProxy)) {
 782       globals_->trusted_spdy_proxy.set(
 783           command_line.GetSwitchValueASCII(switches::kTrustedSpdyProxy));
 784     }
 785     if (command_line.HasSwitch(switches::kIgnoreUrlFetcherCertRequests))
 786       net::URLFetcher::SetIgnoreCertificateRequests(true);
 787
 788     if (command_line.HasSwitch(switches::kUseSpdy)) {
 789       std::string spdy_mode =
 790           command_line.GetSwitchValueASCII(switches::kUseSpdy);
 791       EnableSpdy(spdy_mode);
 792     } else if (command_line.HasSwitch(switches::kEnableSpdy4)) {
 793       globals_->next_protos = net::NextProtosSpdy4Http2();
 794       globals_->use_alternate_protocols.set(true);
 795     } else if (command_line.HasSwitch(switches::kDisableSpdy31)) {
 796       globals_->next_protos = net::NextProtosSpdy3();
 797       globals_->use_alternate_protocols.set(true);
 798     } else if (command_line.HasSwitch(switches::kEnableNpnHttpOnly)) {
 799       globals_->next_protos = net::NextProtosHttpOnly();
 800       globals_->use_alternate_protocols.set(false);
 801     } else if (command_line.HasSwitch(switches::kEnableWebSocketOverSpdy)) {
 802       // Use the current SPDY default (SPDY/3.1).
 803       globals_->next_protos = net::NextProtosSpdy31();
 804       globals_->use_alternate_protocols.set(true);
 805     } else {
 806       // No SPDY command-line flags have been specified. Examine trial groups.
 807       ConfigureSpdyFromTrial(
 808           base::FieldTrialList::FindFullName(kSpdyFieldTrialName), globals_);
 809     }
 810
 811     if (command_line.HasSwitch(switches::kEnableWebSocketOverSpdy))
 812       globals_->enable_websocket_over_spdy.set(true);
 813   }
 814
 815   ConfigureTCPFastOpen(command_line);
 816
 817   // TODO(rch): Make the client socket factory a per-network session
 818   // instance, constructed from a NetworkSession::Params, to allow us
 819   // to move this option to IOThread::Globals &
 820   // HttpNetworkSession::Params.
 821 }
 822
 823 void IOThread::ConfigureTCPFastOpen(const CommandLine& command_line) {
 824   const std::string trial_group =
 825       base::FieldTrialList::FindFullName(kTCPFastOpenFieldTrialName);
 826   if (trial_group == kTCPFastOpenHttpsEnabledGroupName)
 827     globals_->enable_tcp_fast_open_for_ssl.set(true);
 828   bool always_enable_if_supported =
 829       command_line.HasSwitch(switches::kEnableTcpFastOpen);
 830   // Check for OS support of TCP FastOpen, and turn it on for all connections
 831   // if indicated by user.
 832   net::CheckSupportAndMaybeEnableTCPFastOpen(always_enable_if_supported);
 833 }
 834
 835 void IOThread::ConfigureSpdyFromTrial(const std::string& spdy_trial_group,
 836                                       Globals* globals) {
 837   if (spdy_trial_group == kSpdyFieldTrialHoldbackGroupName) {
 838     // TODO(jgraettinger): Use net::NextProtosHttpOnly() instead?
 839     net::HttpStreamFactory::set_spdy_enabled(false);
 840   } else if (spdy_trial_group == kSpdyFieldTrialHoldbackControlGroupName) {
 841     // Use the current SPDY default (SPDY/3.1).
 842     globals->next_protos = net::NextProtosSpdy31();
 843     globals->use_alternate_protocols.set(true);
 844   } else if (spdy_trial_group == kSpdyFieldTrialSpdy4GroupName) {
 845     globals->next_protos = net::NextProtosSpdy4Http2();
 846     globals->use_alternate_protocols.set(true);
 847   } else if (spdy_trial_group == kSpdyFieldTrialSpdy4ControlGroupName) {
 848     // This control group is pinned at SPDY/3.1.
 849     globals->next_protos = net::NextProtosSpdy31();
 850     globals->use_alternate_protocols.set(true);
 851   } else {
 852     // Use the current SPDY default (SPDY/3.1).
 853     globals->next_protos = net::NextProtosSpdy31();
 854     globals->use_alternate_protocols.set(true);
 855   }
 856 }
 857
 858 void IOThread::EnableSpdy(const std::string& mode) {
 859   static const char kOff[] = "off";
 860   static const char kSSL[] = "ssl";
 861   static const char kDisableSSL[] = "no-ssl";
 862   static const char kDisablePing[] = "no-ping";
 863   static const char kExclude[] = "exclude";  // Hosts to exclude
 864   static const char kDisableCompression[] = "no-compress";
 865   static const char kDisableAltProtocols[] = "no-alt-protocols";
 866   static const char kForceAltProtocols[] = "force-alt-protocols";
 867   static const char kSingleDomain[] = "single-domain";
 868
 869   static const char kInitialMaxConcurrentStreams[] = "init-max-streams";
 870
 871   std::vector<std::string> spdy_options;
 872   base::SplitString(mode, ',', &spdy_options);
 873
 874   for (std::vector<std::string>::iterator it = spdy_options.begin();
 875        it != spdy_options.end(); ++it) {
 876     const std::string& element = *it;
 877     std::vector<std::string> name_value;
 878     base::SplitString(element, '=', &name_value);
 879     const std::string& option =
 880         name_value.size() > 0 ? name_value[0] : std::string();
 881     const std::string value =
 882         name_value.size() > 1 ? name_value[1] : std::string();
 883
 884     if (option == kOff) {
 885       net::HttpStreamFactory::set_spdy_enabled(false);
 886     } else if (option == kDisableSSL) {
 887       globals_->spdy_default_protocol.set(net::kProtoSPDY3);
 888       globals_->force_spdy_over_ssl.set(false);
 889       globals_->force_spdy_always.set(true);
 890     } else if (option == kSSL) {
 891       globals_->spdy_default_protocol.set(net::kProtoSPDY3);
 892       globals_->force_spdy_over_ssl.set(true);
 893       globals_->force_spdy_always.set(true);
 894     } else if (option == kDisablePing) {
 895       globals_->enable_spdy_ping_based_connection_checking.set(false);
 896     } else if (option == kExclude) {
 897       globals_->forced_spdy_exclusions.insert(
 898           net::HostPortPair::FromURL(GURL(value)));
 899     } else if (option == kDisableCompression) {
 900       globals_->enable_spdy_compression.set(false);
 901     } else if (option == kDisableAltProtocols) {
 902       globals_->use_alternate_protocols.set(false);
 903     } else if (option == kForceAltProtocols) {
 904       net::AlternateProtocolInfo pair(443, net::NPN_SPDY_3, 1);
 905       net::HttpServerPropertiesImpl::ForceAlternateProtocol(pair);
 906     } else if (option == kSingleDomain) {
 907       DVLOG(1) << "FORCING SINGLE DOMAIN";
 908       globals_->force_spdy_single_domain.set(true);
 909     } else if (option == kInitialMaxConcurrentStreams) {
 910       int streams;
 911       if (base::StringToInt(value, &streams))
 912         globals_->initial_max_spdy_concurrent_streams.set(streams);
 913     } else if (option.empty() && it == spdy_options.begin()) {
 914       continue;
 915     } else {
 916       LOG(DFATAL) << "Unrecognized spdy option: " << option;
 917     }
 918   }
 919 }
 920
 921 // static
 922 void IOThread::RegisterPrefs(PrefRegistrySimple* registry) {
 923   registry->RegisterStringPref(prefs::kAuthSchemes,
 924                                "basic,digest,ntlm,negotiate,"
 925                                "spdyproxy");
 926   registry->RegisterBooleanPref(prefs::kDisableAuthNegotiateCnameLookup, false);
 927   registry->RegisterBooleanPref(prefs::kEnableAuthNegotiatePort, false);
 928   registry->RegisterStringPref(prefs::kAuthServerWhitelist, std::string());
 929   registry->RegisterStringPref(prefs::kAuthNegotiateDelegateWhitelist,
 930                                std::string());
 931   registry->RegisterStringPref(prefs::kGSSAPILibraryName, std::string());
 932   registry->RegisterStringPref(
 933       data_reduction_proxy::prefs::kDataReductionProxy, std::string());
 934   registry->RegisterBooleanPref(prefs::kEnableReferrers, true);
 935   data_reduction_proxy::RegisterPrefs(registry);
 936   registry->RegisterBooleanPref(prefs::kBuiltInDnsClientEnabled, true);
 937   registry->RegisterBooleanPref(prefs::kQuickCheckEnabled, true);
 938 }
 939
 940 net::HttpAuthHandlerFactory* IOThread::CreateDefaultAuthHandlerFactory(
 941     net::HostResolver* resolver) {
 942   net::HttpAuthFilterWhitelist* auth_filter_default_credentials = NULL;
 943   if (!auth_server_whitelist_.empty()) {
 944     auth_filter_default_credentials =
 945         new net::HttpAuthFilterWhitelist(auth_server_whitelist_);
 946   }
 947   net::HttpAuthFilterWhitelist* auth_filter_delegate = NULL;
 948   if (!auth_delegate_whitelist_.empty()) {
 949     auth_filter_delegate =
 950         new net::HttpAuthFilterWhitelist(auth_delegate_whitelist_);
 951   }
 952   globals_->url_security_manager.reset(
 953       net::URLSecurityManager::Create(auth_filter_default_credentials,
 954                                       auth_filter_delegate));
 955   std::vector<std::string> supported_schemes;
 956   base::SplitString(auth_schemes_, ',', &supported_schemes);
 957
 958   scoped_ptr<net::HttpAuthHandlerRegistryFactory> registry_factory(
 959       net::HttpAuthHandlerRegistryFactory::Create(
 960           supported_schemes, globals_->url_security_manager.get(),
 961           resolver, gssapi_library_name_, negotiate_disable_cname_lookup_,
 962           negotiate_enable_port_));
 963   return registry_factory.release();
 964 }
 965
 966 void IOThread::ClearHostCache() {
 967   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 968
 969   net::HostCache* host_cache = globals_->host_resolver->GetHostCache();
 970   if (host_cache)
 971     host_cache->clear();
 972 }
 973
 974 void IOThread::InitializeNetworkSessionParams(
 975     net::HttpNetworkSession::Params* params) {
 976   InitializeNetworkSessionParamsFromGlobals(*globals_, params);
 977 }
 978
 979 // static
 980 void IOThread::InitializeNetworkSessionParamsFromGlobals(
 981     const IOThread::Globals& globals,
 982     net::HttpNetworkSession::Params* params) {
 983   params->host_resolver = globals.host_resolver.get();
 984   params->cert_verifier = globals.cert_verifier.get();
 985   params->channel_id_service = globals.system_channel_id_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->enable_ssl_connect_job_waiting =
 994       globals.enable_ssl_connect_job_waiting;
 995   params->ignore_certificate_errors = globals.ignore_certificate_errors;
 996   params->use_stale_while_revalidate = globals.use_stale_while_revalidate;
 997   params->testing_fixed_http_port = globals.testing_fixed_http_port;
 998   params->testing_fixed_https_port = globals.testing_fixed_https_port;
 999   globals.enable_tcp_fast_open_for_ssl.CopyToIfSet(
1000       &params->enable_tcp_fast_open_for_ssl);
1001
1002   globals.initial_max_spdy_concurrent_streams.CopyToIfSet(
1003       &params->spdy_initial_max_concurrent_streams);
1004   globals.force_spdy_single_domain.CopyToIfSet(
1005       &params->force_spdy_single_domain);
1006   globals.enable_spdy_compression.CopyToIfSet(
1007       &params->enable_spdy_compression);
1008   globals.enable_spdy_ping_based_connection_checking.CopyToIfSet(
1009       &params->enable_spdy_ping_based_connection_checking);
1010   globals.spdy_default_protocol.CopyToIfSet(
1011       &params->spdy_default_protocol);
1012   params->next_protos = globals.next_protos;
1013   globals.trusted_spdy_proxy.CopyToIfSet(&params->trusted_spdy_proxy);
1014   globals.force_spdy_over_ssl.CopyToIfSet(&params->force_spdy_over_ssl);
1015   globals.force_spdy_always.CopyToIfSet(&params->force_spdy_always);
1016   params->forced_spdy_exclusions = globals.forced_spdy_exclusions;
1017   globals.use_alternate_protocols.CopyToIfSet(
1018       &params->use_alternate_protocols);
1019   globals.alternate_protocol_probability_threshold.CopyToIfSet(
1020       &params->alternate_protocol_probability_threshold);
1021   globals.enable_websocket_over_spdy.CopyToIfSet(
1022       &params->enable_websocket_over_spdy);
1023
1024   globals.enable_quic.CopyToIfSet(&params->enable_quic);
1025   globals.quic_always_require_handshake_confirmation.CopyToIfSet(
1026       &params->quic_always_require_handshake_confirmation);
1027   globals.quic_disable_connection_pooling.CopyToIfSet(
1028       &params->quic_disable_connection_pooling);
1029   globals.enable_quic_port_selection.CopyToIfSet(
1030       &params->enable_quic_port_selection);
1031   globals.quic_max_packet_length.CopyToIfSet(&params->quic_max_packet_length);
1032   globals.quic_user_agent_id.CopyToIfSet(&params->quic_user_agent_id);
1033   globals.quic_supported_versions.CopyToIfSet(
1034       &params->quic_supported_versions);
1035   params->quic_connection_options = globals.quic_connection_options;
1036
1037   globals.origin_to_force_quic_on.CopyToIfSet(
1038       &params->origin_to_force_quic_on);
1039   params->enable_user_alternate_protocol_ports =
1040       globals.enable_user_alternate_protocol_ports;
1041   params->proxy_delegate = globals.data_reduction_proxy_delegate.get();
1042 }
1043
1044 base::TimeTicks IOThread::creation_time() const {
1045   return creation_time_;
1046 }
1047
1048 net::SSLConfigService* IOThread::GetSSLConfigService() {
1049   return ssl_config_service_manager_->Get();
1050 }
1051
1052 void IOThread::ChangedToOnTheRecordOnIOThread() {
1053   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1054
1055   // Clear the host cache to avoid showing entries from the OTR session
1056   // in about:net-internals.
1057   ClearHostCache();
1058 }
1059
1060 void IOThread::InitSystemRequestContext() {
1061   if (system_url_request_context_getter_.get())
1062     return;
1063   // If we're in unit_tests, IOThread may not be run.
1064   if (!BrowserThread::IsMessageLoopValid(BrowserThread::IO))
1065     return;
1066   system_proxy_config_service_.reset(
1067       ProxyServiceFactory::CreateProxyConfigService(
1068           pref_proxy_config_tracker_.get()));
1069   system_url_request_context_getter_ =
1070       new SystemURLRequestContextGetter(this);
1071   // Safe to post an unretained this pointer, since IOThread is
1072   // guaranteed to outlive the IO BrowserThread.
1073   BrowserThread::PostTask(
1074       BrowserThread::IO,
1075       FROM_HERE,
1076       base::Bind(&IOThread::InitSystemRequestContextOnIOThread,
1077                  base::Unretained(this)));
1078 }
1079
1080 void IOThread::InitSystemRequestContextOnIOThread() {
1081   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1082   DCHECK(!globals_->system_proxy_service.get());
1083   DCHECK(system_proxy_config_service_.get());
1084
1085   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
1086   globals_->system_proxy_service.reset(
1087       ProxyServiceFactory::CreateProxyService(
1088           net_log_,
1089           globals_->proxy_script_fetcher_context.get(),
1090           globals_->system_network_delegate.get(),
1091           system_proxy_config_service_.release(),
1092           command_line,
1093           quick_check_enabled_.GetValue()));
1094   DCHECK(globals_->data_reduction_proxy_params);
1095
1096   net::HttpNetworkSession::Params system_params;
1097   InitializeNetworkSessionParams(&system_params);
1098   system_params.net_log = net_log_;
1099   system_params.proxy_service = globals_->system_proxy_service.get();
1100
1101   globals_->system_http_transaction_factory.reset(
1102       new net::HttpNetworkLayer(
1103           new net::HttpNetworkSession(system_params)));
1104   globals_->system_url_request_job_factory.reset(
1105       new net::URLRequestJobFactoryImpl());
1106   globals_->system_request_context.reset(
1107       ConstructSystemRequestContext(globals_, net_log_));
1108   globals_->system_request_context->set_ssl_config_service(
1109       globals_->ssl_config_service.get());
1110   globals_->system_request_context->set_http_server_properties(
1111       globals_->http_server_properties->GetWeakPtr());
1112 }
1113
1114 void IOThread::UpdateDnsClientEnabled() {
1115   globals()->host_resolver->SetDnsClientEnabled(*dns_client_enabled_);
1116 }
1117
1118 void IOThread::ConfigureQuic(const CommandLine& command_line) {
1119   // Always fetch the field trial group to ensure it is reported correctly.
1120   // The command line flags will be associated with a group that is reported
1121   // so long as trial is actually queried.
1122   std::string group =
1123       base::FieldTrialList::FindFullName(kQuicFieldTrialName);
1124   VariationParameters params;
1125   if (!variations::GetVariationParams(kQuicFieldTrialName, &params)) {
1126     params.clear();
1127   }
1128
1129   ConfigureQuicGlobals(command_line, group, params, globals_);
1130 }
1131
1132 void IOThread::SetupDataReductionProxy(
1133     ChromeNetworkDelegate* network_delegate) {
1134   // TODO(kundaji): Move flags initialization to DataReductionProxyParams and
1135   // merge with flag initialization in
1136   // data_reduction_proxy_chrome_settings_factory.cc.
1137   int flags = data_reduction_proxy::DataReductionProxyParams::kAllowed |
1138       data_reduction_proxy::DataReductionProxyParams::kFallbackAllowed |
1139       data_reduction_proxy::DataReductionProxyParams::kAlternativeAllowed;
1140   if (data_reduction_proxy::DataReductionProxyParams::
1141       IsIncludedInPromoFieldTrial()) {
1142     flags |= data_reduction_proxy::DataReductionProxyParams::kPromoAllowed;
1143   }
1144   if (data_reduction_proxy::DataReductionProxyParams::
1145       IsIncludedInHoldbackFieldTrial()) {
1146     flags |= data_reduction_proxy::DataReductionProxyParams::kHoldback;
1147   }
1148   globals_->data_reduction_proxy_params.reset(
1149       new data_reduction_proxy::DataReductionProxyParams(flags));
1150   globals_->data_reduction_proxy_auth_request_handler.reset(
1151       new data_reduction_proxy::DataReductionProxyAuthRequestHandler(
1152           DataReductionProxyChromeSettings::GetClient(),
1153           globals_->data_reduction_proxy_params.get(),
1154           BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO)));
1155   globals_->data_reduction_proxy_delegate.reset(
1156       new data_reduction_proxy::DataReductionProxyDelegate(
1157           globals_->data_reduction_proxy_auth_request_handler.get()));
1158   // This is the same as in ProfileImplIOData except that we do not collect
1159   // usage stats.
1160   network_delegate->set_data_reduction_proxy_params(
1161       globals_->data_reduction_proxy_params.get());
1162   network_delegate->set_data_reduction_proxy_auth_request_handler(
1163       globals_->data_reduction_proxy_auth_request_handler.get());
1164   network_delegate->set_on_resolve_proxy_handler(
1165       base::Bind(data_reduction_proxy::OnResolveProxyHandler));
1166 }
1167
1168 // static
1169 void IOThread::ConfigureQuicGlobals(
1170     const base::CommandLine& command_line,
1171     base::StringPiece quic_trial_group,
1172     const VariationParameters& quic_trial_params,
1173     IOThread::Globals* globals) {
1174   bool enable_quic = ShouldEnableQuic(command_line, quic_trial_group);
1175   globals->enable_quic.set(enable_quic);
1176   if (enable_quic) {
1177     globals->quic_always_require_handshake_confirmation.set(
1178         ShouldQuicAlwaysRequireHandshakeConfirmation(quic_trial_params));
1179     globals->quic_disable_connection_pooling.set(
1180         ShouldQuicDisableConnectionPooling(quic_trial_params));
1181     globals->enable_quic_port_selection.set(
1182         ShouldEnableQuicPortSelection(command_line));
1183     globals->quic_connection_options =
1184         GetQuicConnectionOptions(command_line, quic_trial_params);
1185     if (ShouldEnableQuicPacing(command_line, quic_trial_group,
1186                                quic_trial_params)) {
1187       globals->quic_connection_options.push_back(net::kPACE);
1188     }
1189   }
1190
1191   size_t max_packet_length = GetQuicMaxPacketLength(command_line,
1192                                                     quic_trial_group,
1193                                                     quic_trial_params);
1194   if (max_packet_length != 0) {
1195     globals->quic_max_packet_length.set(max_packet_length);
1196   }
1197
1198   std::string quic_user_agent_id =
1199       chrome::VersionInfo::GetVersionStringModifier();
1200   if (!quic_user_agent_id.empty())
1201     quic_user_agent_id.push_back(' ');
1202   chrome::VersionInfo version_info;
1203   quic_user_agent_id.append(version_info.ProductNameAndVersionForUserAgent());
1204   globals->quic_user_agent_id.set(quic_user_agent_id);
1205
1206   net::QuicVersion version = GetQuicVersion(command_line, quic_trial_params);
1207   if (version != net::QUIC_VERSION_UNSUPPORTED) {
1208     net::QuicVersionVector supported_versions;
1209     supported_versions.push_back(version);
1210     globals->quic_supported_versions.set(supported_versions);
1211   }
1212
1213   double threshold =
1214       GetAlternateProtocolProbabilityThreshold(command_line, quic_trial_params);
1215   if (threshold >=0 && threshold <= 1) {
1216     globals->alternate_protocol_probability_threshold.set(threshold);
1217     globals->http_server_properties->SetAlternateProtocolProbabilityThreshold(
1218         threshold);
1219   }
1220
1221   if (command_line.HasSwitch(switches::kOriginToForceQuicOn)) {
1222     net::HostPortPair quic_origin =
1223         net::HostPortPair::FromString(
1224             command_line.GetSwitchValueASCII(switches::kOriginToForceQuicOn));
1225     if (!quic_origin.IsEmpty()) {
1226       globals->origin_to_force_quic_on.set(quic_origin);
1227     }
1228   }
1229 }
1230
1231 bool IOThread::ShouldEnableQuic(const CommandLine& command_line,
1232                                 base::StringPiece quic_trial_group) {
1233   if (command_line.HasSwitch(switches::kDisableQuic))
1234     return false;
1235
1236   if (command_line.HasSwitch(switches::kEnableQuic))
1237     return true;
1238
1239   return quic_trial_group.starts_with(kQuicFieldTrialEnabledGroupName) ||
1240       quic_trial_group.starts_with(kQuicFieldTrialHttpsEnabledGroupName);
1241 }
1242
1243 bool IOThread::ShouldEnableQuicPortSelection(
1244       const CommandLine& command_line) {
1245   if (command_line.HasSwitch(switches::kDisableQuicPortSelection))
1246     return false;
1247
1248   if (command_line.HasSwitch(switches::kEnableQuicPortSelection))
1249     return true;
1250
1251   return false;  // Default to disabling port selection on all channels.
1252 }
1253
1254 bool IOThread::ShouldEnableQuicPacing(
1255     const CommandLine& command_line,
1256     base::StringPiece quic_trial_group,
1257     const VariationParameters& quic_trial_params) {
1258   if (command_line.HasSwitch(switches::kEnableQuicPacing))
1259     return true;
1260
1261   if (command_line.HasSwitch(switches::kDisableQuicPacing))
1262     return false;
1263
1264   if (LowerCaseEqualsASCII(
1265       GetVariationParam(quic_trial_params, "enable_pacing"),
1266       "true"))
1267     return true;
1268
1269   return quic_trial_group.ends_with(kQuicFieldTrialPacingSuffix);
1270 }
1271
1272 net::QuicTagVector IOThread::GetQuicConnectionOptions(
1273     const CommandLine& command_line,
1274     const VariationParameters& quic_trial_params) {
1275   if (command_line.HasSwitch(switches::kQuicConnectionOptions)) {
1276     return ParseQuicConnectionOptions(
1277         command_line.GetSwitchValueASCII(switches::kQuicConnectionOptions));
1278   }
1279
1280   VariationParameters::const_iterator it =
1281       quic_trial_params.find("connection_options");
1282   if (it == quic_trial_params.end()) {
1283     // TODO(rch): remove support for deprecated congestion_options.
1284     it = quic_trial_params.find("congestion_options");
1285     if (it == quic_trial_params.end())
1286       return net::QuicTagVector();
1287   }
1288
1289   return ParseQuicConnectionOptions(it->second);
1290 }
1291
1292 // static
1293 net::QuicTagVector IOThread::ParseQuicConnectionOptions(
1294     const std::string& connection_options) {
1295   net::QuicTagVector options;
1296   std::vector<std::string> tokens;
1297   base::SplitString(connection_options, ',', &tokens);
1298   // Tokens are expected to be no more than 4 characters long, but we
1299   // handle overflow gracefully.
1300   for (std::vector<std::string>::iterator token = tokens.begin();
1301        token != tokens.end(); ++token) {
1302     uint32 option = 0;
1303     for (size_t i = token->length() ; i > 0; --i) {
1304       option <<= 8;
1305       option |= static_cast<unsigned char>((*token)[i - 1]);
1306     }
1307     options.push_back(static_cast<net::QuicTag>(option));
1308   }
1309   return options;
1310 }
1311
1312 // static
1313 double IOThread::GetAlternateProtocolProbabilityThreshold(
1314     const base::CommandLine& command_line,
1315     const VariationParameters& quic_trial_params) {
1316   double value;
1317   if (command_line.HasSwitch(
1318           switches::kAlternateProtocolProbabilityThreshold)) {
1319     if (base::StringToDouble(
1320             command_line.GetSwitchValueASCII(
1321                 switches::kAlternateProtocolProbabilityThreshold),
1322             &value)) {
1323       return value;
1324     }
1325   }
1326   if (command_line.HasSwitch(switches::kEnableQuic)) {
1327     return 0;
1328   }
1329   if (base::StringToDouble(
1330           GetVariationParam(quic_trial_params,
1331                             "alternate_protocol_probability_threshold"),
1332           &value)) {
1333     return value;
1334   }
1335   return -1;
1336 }
1337
1338 // static
1339 bool IOThread::ShouldQuicAlwaysRequireHandshakeConfirmation(
1340     const VariationParameters& quic_trial_params) {
1341   return LowerCaseEqualsASCII(
1342       GetVariationParam(quic_trial_params,
1343                         "always_require_handshake_confirmation"),
1344       "true");
1345 }
1346
1347 // static
1348 bool IOThread::ShouldQuicDisableConnectionPooling(
1349     const VariationParameters& quic_trial_params) {
1350   return LowerCaseEqualsASCII(
1351       GetVariationParam(quic_trial_params, "disable_connection_pooling"),
1352       "true");
1353 }
1354
1355 // static
1356 size_t IOThread::GetQuicMaxPacketLength(
1357     const CommandLine& command_line,
1358     base::StringPiece quic_trial_group,
1359     const VariationParameters& quic_trial_params) {
1360   if (command_line.HasSwitch(switches::kQuicMaxPacketLength)) {
1361     unsigned value;
1362     if (!base::StringToUint(
1363             command_line.GetSwitchValueASCII(switches::kQuicMaxPacketLength),
1364             &value)) {
1365       return 0;
1366     }
1367     return value;
1368   }
1369
1370   unsigned value;
1371   if (base::StringToUint(GetVariationParam(quic_trial_params,
1372                                            "max_packet_length"),
1373                          &value)) {
1374     return value;
1375   }
1376
1377   // Format of the packet length group names is:
1378   //   (Https)?Enabled<length>BytePackets.
1379   base::StringPiece length_str(quic_trial_group);
1380   if (length_str.starts_with(kQuicFieldTrialEnabledGroupName)) {
1381     length_str.remove_prefix(strlen(kQuicFieldTrialEnabledGroupName));
1382   } else if (length_str.starts_with(kQuicFieldTrialHttpsEnabledGroupName)) {
1383     length_str.remove_prefix(strlen(kQuicFieldTrialHttpsEnabledGroupName));
1384   } else {
1385     return 0;
1386   }
1387   if (!length_str.ends_with(kQuicFieldTrialPacketLengthSuffix)) {
1388     return 0;
1389   }
1390   length_str.remove_suffix(strlen(kQuicFieldTrialPacketLengthSuffix));
1391   if (!base::StringToUint(length_str, &value)) {
1392     return 0;
1393   }
1394   return value;
1395 }
1396
1397 // static
1398 net::QuicVersion IOThread::GetQuicVersion(
1399     const CommandLine& command_line,
1400     const VariationParameters& quic_trial_params) {
1401   if (command_line.HasSwitch(switches::kQuicVersion)) {
1402     return ParseQuicVersion(
1403         command_line.GetSwitchValueASCII(switches::kQuicVersion));
1404   }
1405
1406   return ParseQuicVersion(GetVariationParam(quic_trial_params, "quic_version"));
1407 }
1408
1409 // static
1410 net::QuicVersion IOThread::ParseQuicVersion(const std::string& quic_version) {
1411   net::QuicVersionVector supported_versions = net::QuicSupportedVersions();
1412   for (size_t i = 0; i < supported_versions.size(); ++i) {
1413     net::QuicVersion version = supported_versions[i];
1414     if (net::QuicVersionToString(version) == quic_version) {
1415       return version;
1416     }
1417   }
1418
1419   return net::QUIC_VERSION_UNSUPPORTED;
1420 }