net/http/http_network_transaction.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 "net/http/http_network_transaction.h"
   6
   7 #include <set>
   8 #include <vector>
   9
  10 #include "base/bind.h"
  11 #include "base/bind_helpers.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/format_macros.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/metrics/field_trial.h"
  16 #include "base/metrics/histogram.h"
  17 #include "base/metrics/stats_counters.h"
  18 #include "base/stl_util.h"
  19 #include "base/strings/string_number_conversions.h"
  20 #include "base/strings/string_util.h"
  21 #include "base/strings/stringprintf.h"
  22 #include "base/time/time.h"
  23 #include "base/values.h"
  24 #include "build/build_config.h"
  25 #include "net/base/auth.h"
  26 #include "net/base/host_port_pair.h"
  27 #include "net/base/io_buffer.h"
  28 #include "net/base/load_flags.h"
  29 #include "net/base/load_timing_info.h"
  30 #include "net/base/net_errors.h"
  31 #include "net/base/net_util.h"
  32 #include "net/base/upload_data_stream.h"
  33 #include "net/http/http_auth.h"
  34 #include "net/http/http_auth_handler.h"
  35 #include "net/http/http_auth_handler_factory.h"
  36 #include "net/http/http_basic_stream.h"
  37 #include "net/http/http_chunked_decoder.h"
  38 #include "net/http/http_network_session.h"
  39 #include "net/http/http_proxy_client_socket.h"
  40 #include "net/http/http_proxy_client_socket_pool.h"
  41 #include "net/http/http_request_headers.h"
  42 #include "net/http/http_request_info.h"
  43 #include "net/http/http_response_headers.h"
  44 #include "net/http/http_response_info.h"
  45 #include "net/http/http_server_properties.h"
  46 #include "net/http/http_status_code.h"
  47 #include "net/http/http_stream_base.h"
  48 #include "net/http/http_stream_factory.h"
  49 #include "net/http/http_util.h"
  50 #include "net/http/transport_security_state.h"
  51 #include "net/http/url_security_manager.h"
  52 #include "net/socket/client_socket_factory.h"
  53 #include "net/socket/socks_client_socket_pool.h"
  54 #include "net/socket/ssl_client_socket.h"
  55 #include "net/socket/ssl_client_socket_pool.h"
  56 #include "net/socket/transport_client_socket_pool.h"
  57 #include "net/spdy/hpack_huffman_aggregator.h"
  58 #include "net/spdy/spdy_http_stream.h"
  59 #include "net/spdy/spdy_session.h"
  60 #include "net/spdy/spdy_session_pool.h"
  61 #include "net/ssl/ssl_cert_request_info.h"
  62 #include "net/ssl/ssl_connection_status_flags.h"
  63 #include "url/gurl.h"
  64 #include "url/url_canon.h"
  65
  66 using base::Time;
  67 using base::TimeDelta;
  68
  69 namespace net {
  70
  71 namespace {
  72
  73 void ProcessAlternateProtocol(
  74     HttpNetworkSession* session,
  75     const HttpResponseHeaders& headers,
  76     const HostPortPair& http_host_port_pair) {
  77   if (!headers.HasHeader(kAlternateProtocolHeader))
  78     return;
  79
  80   std::vector<std::string> alternate_protocol_values;
  81   void* iter = NULL;
  82   std::string alternate_protocol_str;
  83   while (headers.EnumerateHeader(&iter, kAlternateProtocolHeader,
  84                                  &alternate_protocol_str)) {
  85     alternate_protocol_values.push_back(alternate_protocol_str);
  86   }
  87
  88   session->http_stream_factory()->ProcessAlternateProtocol(
  89       session->http_server_properties(),
  90       alternate_protocol_values,
  91       http_host_port_pair,
  92       *session);
  93 }
  94
  95 // Returns true if |error| is a client certificate authentication error.
  96 bool IsClientCertificateError(int error) {
  97   switch (error) {
  98     case ERR_BAD_SSL_CLIENT_AUTH_CERT:
  99     case ERR_SSL_CLIENT_AUTH_PRIVATE_KEY_ACCESS_DENIED:
 100     case ERR_SSL_CLIENT_AUTH_CERT_NO_PRIVATE_KEY:
 101     case ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED:
 102       return true;
 103     default:
 104       return false;
 105   }
 106 }
 107
 108 base::Value* NetLogSSLVersionFallbackCallback(
 109     const GURL* url,
 110     int net_error,
 111     uint16 version_before,
 112     uint16 version_after,
 113     NetLog::LogLevel /* log_level */) {
 114   base::DictionaryValue* dict = new base::DictionaryValue();
 115   dict->SetString("host_and_port", GetHostAndPort(*url));
 116   dict->SetInteger("net_error", net_error);
 117   dict->SetInteger("version_before", version_before);
 118   dict->SetInteger("version_after", version_after);
 119   return dict;
 120 }
 121
 122 }  // namespace
 123
 124 //-----------------------------------------------------------------------------
 125
 126 HttpNetworkTransaction::HttpNetworkTransaction(RequestPriority priority,
 127                                                HttpNetworkSession* session)
 128     : pending_auth_target_(HttpAuth::AUTH_NONE),
 129       io_callback_(base::Bind(&HttpNetworkTransaction::OnIOComplete,
 130                               base::Unretained(this))),
 131       session_(session),
 132       request_(NULL),
 133       priority_(priority),
 134       headers_valid_(false),
 135       logged_response_time_(false),
 136       fallback_error_code_(ERR_SSL_INAPPROPRIATE_FALLBACK),
 137       request_headers_(),
 138       read_buf_len_(0),
 139       total_received_bytes_(0),
 140       next_state_(STATE_NONE),
 141       establishing_tunnel_(false),
 142       websocket_handshake_stream_base_create_helper_(NULL) {
 143   session->ssl_config_service()->GetSSLConfig(&server_ssl_config_);
 144   session->GetNextProtos(&server_ssl_config_.next_protos);
 145   proxy_ssl_config_ = server_ssl_config_;
 146 }
 147
 148 HttpNetworkTransaction::~HttpNetworkTransaction() {
 149   if (stream_.get()) {
 150     HttpResponseHeaders* headers = GetResponseHeaders();
 151     // TODO(mbelshe): The stream_ should be able to compute whether or not the
 152     //                stream should be kept alive.  No reason to compute here
 153     //                and pass it in.
 154     bool try_to_keep_alive =
 155         next_state_ == STATE_NONE &&
 156         stream_->CanFindEndOfResponse() &&
 157         (!headers || headers->IsKeepAlive());
 158     if (!try_to_keep_alive) {
 159       stream_->Close(true /* not reusable */);
 160     } else {
 161       if (stream_->IsResponseBodyComplete()) {
 162         // If the response body is complete, we can just reuse the socket.
 163         stream_->Close(false /* reusable */);
 164       } else if (stream_->IsSpdyHttpStream()) {
 165         // Doesn't really matter for SpdyHttpStream. Just close it.
 166         stream_->Close(true /* not reusable */);
 167       } else {
 168         // Otherwise, we try to drain the response body.
 169         HttpStreamBase* stream = stream_.release();
 170         stream->Drain(session_);
 171       }
 172     }
 173   }
 174
 175   if (request_ && request_->upload_data_stream)
 176     request_->upload_data_stream->Reset();  // Invalidate pending callbacks.
 177 }
 178
 179 int HttpNetworkTransaction::Start(const HttpRequestInfo* request_info,
 180                                   const CompletionCallback& callback,
 181                                   const BoundNetLog& net_log) {
 182   SIMPLE_STATS_COUNTER("HttpNetworkTransaction.Count");
 183
 184   net_log_ = net_log;
 185   request_ = request_info;
 186   start_time_ = base::Time::Now();
 187
 188   if (request_->load_flags & LOAD_DISABLE_CERT_REVOCATION_CHECKING) {
 189     server_ssl_config_.rev_checking_enabled = false;
 190     proxy_ssl_config_.rev_checking_enabled = false;
 191   }
 192
 193   // Channel ID is disabled if privacy mode is enabled for this request.
 194   if (request_->privacy_mode == PRIVACY_MODE_ENABLED)
 195     server_ssl_config_.channel_id_enabled = false;
 196
 197   next_state_ = STATE_NOTIFY_BEFORE_CREATE_STREAM;
 198   int rv = DoLoop(OK);
 199   if (rv == ERR_IO_PENDING)
 200     callback_ = callback;
 201   return rv;
 202 }
 203
 204 int HttpNetworkTransaction::RestartIgnoringLastError(
 205     const CompletionCallback& callback) {
 206   DCHECK(!stream_.get());
 207   DCHECK(!stream_request_.get());
 208   DCHECK_EQ(STATE_NONE, next_state_);
 209
 210   next_state_ = STATE_CREATE_STREAM;
 211
 212   int rv = DoLoop(OK);
 213   if (rv == ERR_IO_PENDING)
 214     callback_ = callback;
 215   return rv;
 216 }
 217
 218 int HttpNetworkTransaction::RestartWithCertificate(
 219     X509Certificate* client_cert, const CompletionCallback& callback) {
 220   // In HandleCertificateRequest(), we always tear down existing stream
 221   // requests to force a new connection.  So we shouldn't have one here.
 222   DCHECK(!stream_request_.get());
 223   DCHECK(!stream_.get());
 224   DCHECK_EQ(STATE_NONE, next_state_);
 225
 226   SSLConfig* ssl_config = response_.cert_request_info->is_proxy ?
 227       &proxy_ssl_config_ : &server_ssl_config_;
 228   ssl_config->send_client_cert = true;
 229   ssl_config->client_cert = client_cert;
 230   session_->ssl_client_auth_cache()->Add(
 231       response_.cert_request_info->host_and_port, client_cert);
 232   // Reset the other member variables.
 233   // Note: this is necessary only with SSL renegotiation.
 234   ResetStateForRestart();
 235   next_state_ = STATE_CREATE_STREAM;
 236   int rv = DoLoop(OK);
 237   if (rv == ERR_IO_PENDING)
 238     callback_ = callback;
 239   return rv;
 240 }
 241
 242 int HttpNetworkTransaction::RestartWithAuth(
 243     const AuthCredentials& credentials, const CompletionCallback& callback) {
 244   HttpAuth::Target target = pending_auth_target_;
 245   if (target == HttpAuth::AUTH_NONE) {
 246     NOTREACHED();
 247     return ERR_UNEXPECTED;
 248   }
 249   pending_auth_target_ = HttpAuth::AUTH_NONE;
 250
 251   auth_controllers_[target]->ResetAuth(credentials);
 252
 253   DCHECK(callback_.is_null());
 254
 255   int rv = OK;
 256   if (target == HttpAuth::AUTH_PROXY && establishing_tunnel_) {
 257     // In this case, we've gathered credentials for use with proxy
 258     // authentication of a tunnel.
 259     DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 260     DCHECK(stream_request_ != NULL);
 261     auth_controllers_[target] = NULL;
 262     ResetStateForRestart();
 263     rv = stream_request_->RestartTunnelWithProxyAuth(credentials);
 264   } else {
 265     // In this case, we've gathered credentials for the server or the proxy
 266     // but it is not during the tunneling phase.
 267     DCHECK(stream_request_ == NULL);
 268     PrepareForAuthRestart(target);
 269     rv = DoLoop(OK);
 270   }
 271
 272   if (rv == ERR_IO_PENDING)
 273     callback_ = callback;
 274   return rv;
 275 }
 276
 277 void HttpNetworkTransaction::PrepareForAuthRestart(HttpAuth::Target target) {
 278   DCHECK(HaveAuth(target));
 279   DCHECK(!stream_request_.get());
 280
 281   bool keep_alive = false;
 282   // Even if the server says the connection is keep-alive, we have to be
 283   // able to find the end of each response in order to reuse the connection.
 284   if (GetResponseHeaders()->IsKeepAlive() &&
 285       stream_->CanFindEndOfResponse()) {
 286     // If the response body hasn't been completely read, we need to drain
 287     // it first.
 288     if (!stream_->IsResponseBodyComplete()) {
 289       next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
 290       read_buf_ = new IOBuffer(kDrainBodyBufferSize);  // A bit bucket.
 291       read_buf_len_ = kDrainBodyBufferSize;
 292       return;
 293     }
 294     keep_alive = true;
 295   }
 296
 297   // We don't need to drain the response body, so we act as if we had drained
 298   // the response body.
 299   DidDrainBodyForAuthRestart(keep_alive);
 300 }
 301
 302 void HttpNetworkTransaction::DidDrainBodyForAuthRestart(bool keep_alive) {
 303   DCHECK(!stream_request_.get());
 304
 305   if (stream_.get()) {
 306     total_received_bytes_ += stream_->GetTotalReceivedBytes();
 307     HttpStream* new_stream = NULL;
 308     if (keep_alive && stream_->IsConnectionReusable()) {
 309       // We should call connection_->set_idle_time(), but this doesn't occur
 310       // often enough to be worth the trouble.
 311       stream_->SetConnectionReused();
 312       new_stream =
 313           static_cast<HttpStream*>(stream_.get())->RenewStreamForAuth();
 314     }
 315
 316     if (!new_stream) {
 317       // Close the stream and mark it as not_reusable.  Even in the
 318       // keep_alive case, we've determined that the stream_ is not
 319       // reusable if new_stream is NULL.
 320       stream_->Close(true);
 321       next_state_ = STATE_CREATE_STREAM;
 322     } else {
 323       // Renewed streams shouldn't carry over received bytes.
 324       DCHECK_EQ(0, new_stream->GetTotalReceivedBytes());
 325       next_state_ = STATE_INIT_STREAM;
 326     }
 327     stream_.reset(new_stream);
 328   }
 329
 330   // Reset the other member variables.
 331   ResetStateForAuthRestart();
 332 }
 333
 334 bool HttpNetworkTransaction::IsReadyToRestartForAuth() {
 335   return pending_auth_target_ != HttpAuth::AUTH_NONE &&
 336       HaveAuth(pending_auth_target_);
 337 }
 338
 339 int HttpNetworkTransaction::Read(IOBuffer* buf, int buf_len,
 340                                  const CompletionCallback& callback) {
 341   DCHECK(buf);
 342   DCHECK_LT(0, buf_len);
 343
 344   State next_state = STATE_NONE;
 345
 346   scoped_refptr<HttpResponseHeaders> headers(GetResponseHeaders());
 347   if (headers_valid_ && headers.get() && stream_request_.get()) {
 348     // We're trying to read the body of the response but we're still trying
 349     // to establish an SSL tunnel through an HTTP proxy.  We can't read these
 350     // bytes when establishing a tunnel because they might be controlled by
 351     // an active network attacker.  We don't worry about this for HTTP
 352     // because an active network attacker can already control HTTP sessions.
 353     // We reach this case when the user cancels a 407 proxy auth prompt.  We
 354     // also don't worry about this for an HTTPS Proxy, because the
 355     // communication with the proxy is secure.
 356     // See http://crbug.com/8473.
 357     DCHECK(proxy_info_.is_http() || proxy_info_.is_https());
 358     DCHECK_EQ(headers->response_code(), HTTP_PROXY_AUTHENTICATION_REQUIRED);
 359     LOG(WARNING) << "Blocked proxy response with status "
 360                  << headers->response_code() << " to CONNECT request for "
 361                  << GetHostAndPort(request_->url) << ".";
 362     return ERR_TUNNEL_CONNECTION_FAILED;
 363   }
 364
 365   // Are we using SPDY or HTTP?
 366   next_state = STATE_READ_BODY;
 367
 368   read_buf_ = buf;
 369   read_buf_len_ = buf_len;
 370
 371   next_state_ = next_state;
 372   int rv = DoLoop(OK);
 373   if (rv == ERR_IO_PENDING)
 374     callback_ = callback;
 375   return rv;
 376 }
 377
 378 void HttpNetworkTransaction::StopCaching() {}
 379
 380 bool HttpNetworkTransaction::GetFullRequestHeaders(
 381     HttpRequestHeaders* headers) const {
 382   // TODO(ttuttle): Make sure we've populated request_headers_.
 383   *headers = request_headers_;
 384   return true;
 385 }
 386
 387 int64 HttpNetworkTransaction::GetTotalReceivedBytes() const {
 388   int64 total_received_bytes = total_received_bytes_;
 389   if (stream_)
 390     total_received_bytes += stream_->GetTotalReceivedBytes();
 391   return total_received_bytes;
 392 }
 393
 394 void HttpNetworkTransaction::DoneReading() {}
 395
 396 const HttpResponseInfo* HttpNetworkTransaction::GetResponseInfo() const {
 397   return ((headers_valid_ && response_.headers.get()) ||
 398           response_.ssl_info.cert.get() || response_.cert_request_info.get())
 399              ? &response_
 400              : NULL;
 401 }
 402
 403 LoadState HttpNetworkTransaction::GetLoadState() const {
 404   // TODO(wtc): Define a new LoadState value for the
 405   // STATE_INIT_CONNECTION_COMPLETE state, which delays the HTTP request.
 406   switch (next_state_) {
 407     case STATE_CREATE_STREAM:
 408       return LOAD_STATE_WAITING_FOR_DELEGATE;
 409     case STATE_CREATE_STREAM_COMPLETE:
 410       return stream_request_->GetLoadState();
 411     case STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE:
 412     case STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE:
 413     case STATE_SEND_REQUEST_COMPLETE:
 414       return LOAD_STATE_SENDING_REQUEST;
 415     case STATE_READ_HEADERS_COMPLETE:
 416       return LOAD_STATE_WAITING_FOR_RESPONSE;
 417     case STATE_READ_BODY_COMPLETE:
 418       return LOAD_STATE_READING_RESPONSE;
 419     default:
 420       return LOAD_STATE_IDLE;
 421   }
 422 }
 423
 424 UploadProgress HttpNetworkTransaction::GetUploadProgress() const {
 425   if (!stream_.get())
 426     return UploadProgress();
 427
 428   // TODO(bashi): This cast is temporary. Remove later.
 429   return static_cast<HttpStream*>(stream_.get())->GetUploadProgress();
 430 }
 431
 432 void HttpNetworkTransaction::SetQuicServerInfo(
 433     QuicServerInfo* quic_server_info) {}
 434
 435 bool HttpNetworkTransaction::GetLoadTimingInfo(
 436     LoadTimingInfo* load_timing_info) const {
 437   if (!stream_ || !stream_->GetLoadTimingInfo(load_timing_info))
 438     return false;
 439
 440   load_timing_info->proxy_resolve_start =
 441       proxy_info_.proxy_resolve_start_time();
 442   load_timing_info->proxy_resolve_end = proxy_info_.proxy_resolve_end_time();
 443   load_timing_info->send_start = send_start_time_;
 444   load_timing_info->send_end = send_end_time_;
 445   return true;
 446 }
 447
 448 void HttpNetworkTransaction::SetPriority(RequestPriority priority) {
 449   priority_ = priority;
 450   if (stream_request_)
 451     stream_request_->SetPriority(priority);
 452   if (stream_)
 453     stream_->SetPriority(priority);
 454 }
 455
 456 void HttpNetworkTransaction::SetWebSocketHandshakeStreamCreateHelper(
 457     WebSocketHandshakeStreamBase::CreateHelper* create_helper) {
 458   websocket_handshake_stream_base_create_helper_ = create_helper;
 459 }
 460
 461 void HttpNetworkTransaction::SetBeforeNetworkStartCallback(
 462     const BeforeNetworkStartCallback& callback) {
 463   before_network_start_callback_ = callback;
 464 }
 465
 466 void HttpNetworkTransaction::SetBeforeProxyHeadersSentCallback(
 467     const BeforeProxyHeadersSentCallback& callback) {
 468   before_proxy_headers_sent_callback_ = callback;
 469 }
 470
 471 int HttpNetworkTransaction::ResumeNetworkStart() {
 472   DCHECK_EQ(next_state_, STATE_CREATE_STREAM);
 473   return DoLoop(OK);
 474 }
 475
 476 void HttpNetworkTransaction::OnStreamReady(const SSLConfig& used_ssl_config,
 477                                            const ProxyInfo& used_proxy_info,
 478                                            HttpStreamBase* stream) {
 479   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 480   DCHECK(stream_request_.get());
 481
 482   if (stream_)
 483     total_received_bytes_ += stream_->GetTotalReceivedBytes();
 484   stream_.reset(stream);
 485   server_ssl_config_ = used_ssl_config;
 486   proxy_info_ = used_proxy_info;
 487   response_.was_npn_negotiated = stream_request_->was_npn_negotiated();
 488   response_.npn_negotiated_protocol = SSLClientSocket::NextProtoToString(
 489       stream_request_->protocol_negotiated());
 490   response_.was_fetched_via_spdy = stream_request_->using_spdy();
 491   response_.was_fetched_via_proxy = !proxy_info_.is_direct();
 492   if (response_.was_fetched_via_proxy && !proxy_info_.is_empty())
 493     response_.proxy_server = proxy_info_.proxy_server().host_port_pair();
 494   OnIOComplete(OK);
 495 }
 496
 497 void HttpNetworkTransaction::OnWebSocketHandshakeStreamReady(
 498     const SSLConfig& used_ssl_config,
 499     const ProxyInfo& used_proxy_info,
 500     WebSocketHandshakeStreamBase* stream) {
 501   OnStreamReady(used_ssl_config, used_proxy_info, stream);
 502 }
 503
 504 void HttpNetworkTransaction::OnStreamFailed(int result,
 505                                             const SSLConfig& used_ssl_config) {
 506   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 507   DCHECK_NE(OK, result);
 508   DCHECK(stream_request_.get());
 509   DCHECK(!stream_.get());
 510   server_ssl_config_ = used_ssl_config;
 511
 512   OnIOComplete(result);
 513 }
 514
 515 void HttpNetworkTransaction::OnCertificateError(
 516     int result,
 517     const SSLConfig& used_ssl_config,
 518     const SSLInfo& ssl_info) {
 519   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 520   DCHECK_NE(OK, result);
 521   DCHECK(stream_request_.get());
 522   DCHECK(!stream_.get());
 523
 524   response_.ssl_info = ssl_info;
 525   server_ssl_config_ = used_ssl_config;
 526
 527   // TODO(mbelshe):  For now, we're going to pass the error through, and that
 528   // will close the stream_request in all cases.  This means that we're always
 529   // going to restart an entire STATE_CREATE_STREAM, even if the connection is
 530   // good and the user chooses to ignore the error.  This is not ideal, but not
 531   // the end of the world either.
 532
 533   OnIOComplete(result);
 534 }
 535
 536 void HttpNetworkTransaction::OnNeedsProxyAuth(
 537     const HttpResponseInfo& proxy_response,
 538     const SSLConfig& used_ssl_config,
 539     const ProxyInfo& used_proxy_info,
 540     HttpAuthController* auth_controller) {
 541   DCHECK(stream_request_.get());
 542   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 543
 544   establishing_tunnel_ = true;
 545   response_.headers = proxy_response.headers;
 546   response_.auth_challenge = proxy_response.auth_challenge;
 547   headers_valid_ = true;
 548   server_ssl_config_ = used_ssl_config;
 549   proxy_info_ = used_proxy_info;
 550
 551   auth_controllers_[HttpAuth::AUTH_PROXY] = auth_controller;
 552   pending_auth_target_ = HttpAuth::AUTH_PROXY;
 553
 554   DoCallback(OK);
 555 }
 556
 557 void HttpNetworkTransaction::OnNeedsClientAuth(
 558     const SSLConfig& used_ssl_config,
 559     SSLCertRequestInfo* cert_info) {
 560   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 561
 562   server_ssl_config_ = used_ssl_config;
 563   response_.cert_request_info = cert_info;
 564   OnIOComplete(ERR_SSL_CLIENT_AUTH_CERT_NEEDED);
 565 }
 566
 567 void HttpNetworkTransaction::OnHttpsProxyTunnelResponse(
 568     const HttpResponseInfo& response_info,
 569     const SSLConfig& used_ssl_config,
 570     const ProxyInfo& used_proxy_info,
 571     HttpStreamBase* stream) {
 572   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 573
 574   headers_valid_ = true;
 575   response_ = response_info;
 576   server_ssl_config_ = used_ssl_config;
 577   proxy_info_ = used_proxy_info;
 578   if (stream_)
 579     total_received_bytes_ += stream_->GetTotalReceivedBytes();
 580   stream_.reset(stream);
 581   stream_request_.reset();  // we're done with the stream request
 582   OnIOComplete(ERR_HTTPS_PROXY_TUNNEL_RESPONSE);
 583 }
 584
 585 bool HttpNetworkTransaction::is_https_request() const {
 586   return request_->url.SchemeIs("https");
 587 }
 588
 589 void HttpNetworkTransaction::DoCallback(int rv) {
 590   DCHECK_NE(rv, ERR_IO_PENDING);
 591   DCHECK(!callback_.is_null());
 592
 593   // Since Run may result in Read being called, clear user_callback_ up front.
 594   CompletionCallback c = callback_;
 595   callback_.Reset();
 596   c.Run(rv);
 597 }
 598
 599 void HttpNetworkTransaction::OnIOComplete(int result) {
 600   int rv = DoLoop(result);
 601   if (rv != ERR_IO_PENDING)
 602     DoCallback(rv);
 603 }
 604
 605 int HttpNetworkTransaction::DoLoop(int result) {
 606   DCHECK(next_state_ != STATE_NONE);
 607
 608   int rv = result;
 609   do {
 610     State state = next_state_;
 611     next_state_ = STATE_NONE;
 612     switch (state) {
 613       case STATE_NOTIFY_BEFORE_CREATE_STREAM:
 614         DCHECK_EQ(OK, rv);
 615         rv = DoNotifyBeforeCreateStream();
 616         break;
 617       case STATE_CREATE_STREAM:
 618         DCHECK_EQ(OK, rv);
 619         rv = DoCreateStream();
 620         break;
 621       case STATE_CREATE_STREAM_COMPLETE:
 622         rv = DoCreateStreamComplete(rv);
 623         break;
 624       case STATE_INIT_STREAM:
 625         DCHECK_EQ(OK, rv);
 626         rv = DoInitStream();
 627         break;
 628       case STATE_INIT_STREAM_COMPLETE:
 629         rv = DoInitStreamComplete(rv);
 630         break;
 631       case STATE_GENERATE_PROXY_AUTH_TOKEN:
 632         DCHECK_EQ(OK, rv);
 633         rv = DoGenerateProxyAuthToken();
 634         break;
 635       case STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE:
 636         rv = DoGenerateProxyAuthTokenComplete(rv);
 637         break;
 638       case STATE_GENERATE_SERVER_AUTH_TOKEN:
 639         DCHECK_EQ(OK, rv);
 640         rv = DoGenerateServerAuthToken();
 641         break;
 642       case STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE:
 643         rv = DoGenerateServerAuthTokenComplete(rv);
 644         break;
 645       case STATE_INIT_REQUEST_BODY:
 646         DCHECK_EQ(OK, rv);
 647         rv = DoInitRequestBody();
 648         break;
 649       case STATE_INIT_REQUEST_BODY_COMPLETE:
 650         rv = DoInitRequestBodyComplete(rv);
 651         break;
 652       case STATE_BUILD_REQUEST:
 653         DCHECK_EQ(OK, rv);
 654         net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_SEND_REQUEST);
 655         rv = DoBuildRequest();
 656         break;
 657       case STATE_BUILD_REQUEST_COMPLETE:
 658         rv = DoBuildRequestComplete(rv);
 659         break;
 660       case STATE_SEND_REQUEST:
 661         DCHECK_EQ(OK, rv);
 662         rv = DoSendRequest();
 663         break;
 664       case STATE_SEND_REQUEST_COMPLETE:
 665         rv = DoSendRequestComplete(rv);
 666         net_log_.EndEventWithNetErrorCode(
 667             NetLog::TYPE_HTTP_TRANSACTION_SEND_REQUEST, rv);
 668         break;
 669       case STATE_READ_HEADERS:
 670         DCHECK_EQ(OK, rv);
 671         net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_READ_HEADERS);
 672         rv = DoReadHeaders();
 673         break;
 674       case STATE_READ_HEADERS_COMPLETE:
 675         rv = DoReadHeadersComplete(rv);
 676         net_log_.EndEventWithNetErrorCode(
 677             NetLog::TYPE_HTTP_TRANSACTION_READ_HEADERS, rv);
 678         break;
 679       case STATE_READ_BODY:
 680         DCHECK_EQ(OK, rv);
 681         net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_READ_BODY);
 682         rv = DoReadBody();
 683         break;
 684       case STATE_READ_BODY_COMPLETE:
 685         rv = DoReadBodyComplete(rv);
 686         net_log_.EndEventWithNetErrorCode(
 687             NetLog::TYPE_HTTP_TRANSACTION_READ_BODY, rv);
 688         break;
 689       case STATE_DRAIN_BODY_FOR_AUTH_RESTART:
 690         DCHECK_EQ(OK, rv);
 691         net_log_.BeginEvent(
 692             NetLog::TYPE_HTTP_TRANSACTION_DRAIN_BODY_FOR_AUTH_RESTART);
 693         rv = DoDrainBodyForAuthRestart();
 694         break;
 695       case STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE:
 696         rv = DoDrainBodyForAuthRestartComplete(rv);
 697         net_log_.EndEventWithNetErrorCode(
 698             NetLog::TYPE_HTTP_TRANSACTION_DRAIN_BODY_FOR_AUTH_RESTART, rv);
 699         break;
 700       default:
 701         NOTREACHED() << "bad state";
 702         rv = ERR_FAILED;
 703         break;
 704     }
 705   } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
 706
 707   return rv;
 708 }
 709
 710 int HttpNetworkTransaction::DoNotifyBeforeCreateStream() {
 711   next_state_ = STATE_CREATE_STREAM;
 712   bool defer = false;
 713   if (!before_network_start_callback_.is_null())
 714     before_network_start_callback_.Run(&defer);
 715   if (!defer)
 716     return OK;
 717   return ERR_IO_PENDING;
 718 }
 719
 720 int HttpNetworkTransaction::DoCreateStream() {
 721   next_state_ = STATE_CREATE_STREAM_COMPLETE;
 722   if (ForWebSocketHandshake()) {
 723     stream_request_.reset(
 724         session_->http_stream_factory_for_websocket()
 725             ->RequestWebSocketHandshakeStream(
 726                   *request_,
 727                   priority_,
 728                   server_ssl_config_,
 729                   proxy_ssl_config_,
 730                   this,
 731                   websocket_handshake_stream_base_create_helper_,
 732                   net_log_));
 733   } else {
 734     stream_request_.reset(
 735         session_->http_stream_factory()->RequestStream(
 736             *request_,
 737             priority_,
 738             server_ssl_config_,
 739             proxy_ssl_config_,
 740             this,
 741             net_log_));
 742   }
 743   DCHECK(stream_request_.get());
 744   return ERR_IO_PENDING;
 745 }
 746
 747 int HttpNetworkTransaction::DoCreateStreamComplete(int result) {
 748   if (result == OK) {
 749     next_state_ = STATE_INIT_STREAM;
 750     DCHECK(stream_.get());
 751   } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
 752     result = HandleCertificateRequest(result);
 753   } else if (result == ERR_HTTPS_PROXY_TUNNEL_RESPONSE) {
 754     // Return OK and let the caller read the proxy's error page
 755     next_state_ = STATE_NONE;
 756     return OK;
 757   }
 758
 759   // Handle possible handshake errors that may have occurred if the stream
 760   // used SSL for one or more of the layers.
 761   result = HandleSSLHandshakeError(result);
 762
 763   // At this point we are done with the stream_request_.
 764   stream_request_.reset();
 765   return result;
 766 }
 767
 768 int HttpNetworkTransaction::DoInitStream() {
 769   DCHECK(stream_.get());
 770   next_state_ = STATE_INIT_STREAM_COMPLETE;
 771   return stream_->InitializeStream(request_, priority_, net_log_, io_callback_);
 772 }
 773
 774 int HttpNetworkTransaction::DoInitStreamComplete(int result) {
 775   if (result == OK) {
 776     next_state_ = STATE_GENERATE_PROXY_AUTH_TOKEN;
 777   } else {
 778     if (result < 0)
 779       result = HandleIOError(result);
 780
 781     // The stream initialization failed, so this stream will never be useful.
 782     if (stream_)
 783         total_received_bytes_ += stream_->GetTotalReceivedBytes();
 784     stream_.reset();
 785   }
 786
 787   return result;
 788 }
 789
 790 int HttpNetworkTransaction::DoGenerateProxyAuthToken() {
 791   next_state_ = STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE;
 792   if (!ShouldApplyProxyAuth())
 793     return OK;
 794   HttpAuth::Target target = HttpAuth::AUTH_PROXY;
 795   if (!auth_controllers_[target].get())
 796     auth_controllers_[target] =
 797         new HttpAuthController(target,
 798                                AuthURL(target),
 799                                session_->http_auth_cache(),
 800                                session_->http_auth_handler_factory());
 801   return auth_controllers_[target]->MaybeGenerateAuthToken(request_,
 802                                                            io_callback_,
 803                                                            net_log_);
 804 }
 805
 806 int HttpNetworkTransaction::DoGenerateProxyAuthTokenComplete(int rv) {
 807   DCHECK_NE(ERR_IO_PENDING, rv);
 808   if (rv == OK)
 809     next_state_ = STATE_GENERATE_SERVER_AUTH_TOKEN;
 810   return rv;
 811 }
 812
 813 int HttpNetworkTransaction::DoGenerateServerAuthToken() {
 814   next_state_ = STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE;
 815   HttpAuth::Target target = HttpAuth::AUTH_SERVER;
 816   if (!auth_controllers_[target].get()) {
 817     auth_controllers_[target] =
 818         new HttpAuthController(target,
 819                                AuthURL(target),
 820                                session_->http_auth_cache(),
 821                                session_->http_auth_handler_factory());
 822     if (request_->load_flags & LOAD_DO_NOT_USE_EMBEDDED_IDENTITY)
 823       auth_controllers_[target]->DisableEmbeddedIdentity();
 824   }
 825   if (!ShouldApplyServerAuth())
 826     return OK;
 827   return auth_controllers_[target]->MaybeGenerateAuthToken(request_,
 828                                                            io_callback_,
 829                                                            net_log_);
 830 }
 831
 832 int HttpNetworkTransaction::DoGenerateServerAuthTokenComplete(int rv) {
 833   DCHECK_NE(ERR_IO_PENDING, rv);
 834   if (rv == OK)
 835     next_state_ = STATE_INIT_REQUEST_BODY;
 836   return rv;
 837 }
 838
 839 void HttpNetworkTransaction::BuildRequestHeaders(bool using_proxy) {
 840   request_headers_.SetHeader(HttpRequestHeaders::kHost,
 841                              GetHostAndOptionalPort(request_->url));
 842
 843   // For compat with HTTP/1.0 servers and proxies:
 844   if (using_proxy) {
 845     request_headers_.SetHeader(HttpRequestHeaders::kProxyConnection,
 846                                "keep-alive");
 847   } else {
 848     request_headers_.SetHeader(HttpRequestHeaders::kConnection, "keep-alive");
 849   }
 850
 851   // Add a content length header?
 852   if (request_->upload_data_stream) {
 853     if (request_->upload_data_stream->is_chunked()) {
 854       request_headers_.SetHeader(
 855           HttpRequestHeaders::kTransferEncoding, "chunked");
 856     } else {
 857       request_headers_.SetHeader(
 858           HttpRequestHeaders::kContentLength,
 859           base::Uint64ToString(request_->upload_data_stream->size()));
 860     }
 861   } else if (request_->method == "POST" || request_->method == "PUT" ||
 862              request_->method == "HEAD") {
 863     // An empty POST/PUT request still needs a content length.  As for HEAD,
 864     // IE and Safari also add a content length header.  Presumably it is to
 865     // support sending a HEAD request to an URL that only expects to be sent a
 866     // POST or some other method that normally would have a message body.
 867     request_headers_.SetHeader(HttpRequestHeaders::kContentLength, "0");
 868   }
 869
 870   // Honor load flags that impact proxy caches.
 871   if (request_->load_flags & LOAD_BYPASS_CACHE) {
 872     request_headers_.SetHeader(HttpRequestHeaders::kPragma, "no-cache");
 873     request_headers_.SetHeader(HttpRequestHeaders::kCacheControl, "no-cache");
 874   } else if (request_->load_flags & LOAD_VALIDATE_CACHE) {
 875     request_headers_.SetHeader(HttpRequestHeaders::kCacheControl, "max-age=0");
 876   }
 877
 878   if (ShouldApplyProxyAuth() && HaveAuth(HttpAuth::AUTH_PROXY))
 879     auth_controllers_[HttpAuth::AUTH_PROXY]->AddAuthorizationHeader(
 880         &request_headers_);
 881   if (ShouldApplyServerAuth() && HaveAuth(HttpAuth::AUTH_SERVER))
 882     auth_controllers_[HttpAuth::AUTH_SERVER]->AddAuthorizationHeader(
 883         &request_headers_);
 884
 885   request_headers_.MergeFrom(request_->extra_headers);
 886
 887   if (using_proxy && !before_proxy_headers_sent_callback_.is_null())
 888     before_proxy_headers_sent_callback_.Run(proxy_info_, &request_headers_);
 889
 890   response_.did_use_http_auth =
 891       request_headers_.HasHeader(HttpRequestHeaders::kAuthorization) ||
 892       request_headers_.HasHeader(HttpRequestHeaders::kProxyAuthorization);
 893 }
 894
 895 int HttpNetworkTransaction::DoInitRequestBody() {
 896   next_state_ = STATE_INIT_REQUEST_BODY_COMPLETE;
 897   int rv = OK;
 898   if (request_->upload_data_stream)
 899     rv = request_->upload_data_stream->Init(io_callback_);
 900   return rv;
 901 }
 902
 903 int HttpNetworkTransaction::DoInitRequestBodyComplete(int result) {
 904   if (result == OK)
 905     next_state_ = STATE_BUILD_REQUEST;
 906   return result;
 907 }
 908
 909 int HttpNetworkTransaction::DoBuildRequest() {
 910   next_state_ = STATE_BUILD_REQUEST_COMPLETE;
 911   headers_valid_ = false;
 912
 913   // This is constructed lazily (instead of within our Start method), so that
 914   // we have proxy info available.
 915   if (request_headers_.IsEmpty()) {
 916     bool using_proxy = (proxy_info_.is_http() || proxy_info_.is_https()) &&
 917                         !is_https_request();
 918     BuildRequestHeaders(using_proxy);
 919   }
 920
 921   return OK;
 922 }
 923
 924 int HttpNetworkTransaction::DoBuildRequestComplete(int result) {
 925   if (result == OK)
 926     next_state_ = STATE_SEND_REQUEST;
 927   return result;
 928 }
 929
 930 int HttpNetworkTransaction::DoSendRequest() {
 931   send_start_time_ = base::TimeTicks::Now();
 932   next_state_ = STATE_SEND_REQUEST_COMPLETE;
 933
 934   return stream_->SendRequest(request_headers_, &response_, io_callback_);
 935 }
 936
 937 int HttpNetworkTransaction::DoSendRequestComplete(int result) {
 938   send_end_time_ = base::TimeTicks::Now();
 939   if (result < 0)
 940     return HandleIOError(result);
 941   response_.network_accessed = true;
 942   next_state_ = STATE_READ_HEADERS;
 943   return OK;
 944 }
 945
 946 int HttpNetworkTransaction::DoReadHeaders() {
 947   next_state_ = STATE_READ_HEADERS_COMPLETE;
 948   return stream_->ReadResponseHeaders(io_callback_);
 949 }
 950
 951 int HttpNetworkTransaction::DoReadHeadersComplete(int result) {
 952   // We can get a certificate error or ERR_SSL_CLIENT_AUTH_CERT_NEEDED here
 953   // due to SSL renegotiation.
 954   if (IsCertificateError(result)) {
 955     // We don't handle a certificate error during SSL renegotiation, so we
 956     // have to return an error that's not in the certificate error range
 957     // (-2xx).
 958     LOG(ERROR) << "Got a server certificate with error " << result
 959                << " during SSL renegotiation";
 960     result = ERR_CERT_ERROR_IN_SSL_RENEGOTIATION;
 961   } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
 962     // TODO(wtc): Need a test case for this code path!
 963     DCHECK(stream_.get());
 964     DCHECK(is_https_request());
 965     response_.cert_request_info = new SSLCertRequestInfo;
 966     stream_->GetSSLCertRequestInfo(response_.cert_request_info.get());
 967     result = HandleCertificateRequest(result);
 968     if (result == OK)
 969       return result;
 970   }
 971
 972   if (result == ERR_QUIC_HANDSHAKE_FAILED) {
 973     ResetConnectionAndRequestForResend();
 974     return OK;
 975   }
 976
 977   // After we call RestartWithAuth a new response_time will be recorded, and
 978   // we need to be cautious about incorrectly logging the duration across the
 979   // authentication activity.
 980   if (result == OK)
 981     LogTransactionConnectedMetrics();
 982
 983   // ERR_CONNECTION_CLOSED is treated differently at this point; if partial
 984   // response headers were received, we do the best we can to make sense of it
 985   // and send it back up the stack.
 986   //
 987   // TODO(davidben): Consider moving this to HttpBasicStream, It's a little
 988   // bizarre for SPDY. Assuming this logic is useful at all.
 989   // TODO(davidben): Bubble the error code up so we do not cache?
 990   if (result == ERR_CONNECTION_CLOSED && response_.headers.get())
 991     result = OK;
 992
 993   if (result < 0)
 994     return HandleIOError(result);
 995
 996   DCHECK(response_.headers.get());
 997
 998   // On a 408 response from the server ("Request Timeout") on a stale socket,
 999   // retry the request.
1000   // Headers can be NULL because of http://crbug.com/384554.
1001   if (response_.headers.get() && response_.headers->response_code() == 408 &&
1002       stream_->IsConnectionReused()) {
1003     net_log_.AddEventWithNetErrorCode(
1004         NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR,
1005         response_.headers->response_code());
1006     // This will close the socket - it would be weird to try and reuse it, even
1007     // if the server doesn't actually close it.
1008     ResetConnectionAndRequestForResend();
1009     return OK;
1010   }
1011
1012   // Like Net.HttpResponseCode, but only for MAIN_FRAME loads.
1013   if (request_->load_flags & LOAD_MAIN_FRAME) {
1014     const int response_code = response_.headers->response_code();
1015     UMA_HISTOGRAM_ENUMERATION(
1016         "Net.HttpResponseCode_Nxx_MainFrame", response_code/100, 10);
1017   }
1018
1019   net_log_.AddEvent(
1020       NetLog::TYPE_HTTP_TRANSACTION_READ_RESPONSE_HEADERS,
1021       base::Bind(&HttpResponseHeaders::NetLogCallback, response_.headers));
1022
1023   if (response_.headers->GetParsedHttpVersion() < HttpVersion(1, 0)) {
1024     // HTTP/0.9 doesn't support the PUT method, so lack of response headers
1025     // indicates a buggy server.  See:
1026     // https://bugzilla.mozilla.org/show_bug.cgi?id=193921
1027     if (request_->method == "PUT")
1028       return ERR_METHOD_NOT_SUPPORTED;
1029   }
1030
1031   // Check for an intermediate 100 Continue response.  An origin server is
1032   // allowed to send this response even if we didn't ask for it, so we just
1033   // need to skip over it.
1034   // We treat any other 1xx in this same way (although in practice getting
1035   // a 1xx that isn't a 100 is rare).
1036   // Unless this is a WebSocket request, in which case we pass it on up.
1037   if (response_.headers->response_code() / 100 == 1 &&
1038       !ForWebSocketHandshake()) {
1039     response_.headers = new HttpResponseHeaders(std::string());
1040     next_state_ = STATE_READ_HEADERS;
1041     return OK;
1042   }
1043
1044   HostPortPair endpoint = HostPortPair(request_->url.HostNoBrackets(),
1045                                        request_->url.EffectiveIntPort());
1046   ProcessAlternateProtocol(session_,
1047                            *response_.headers.get(),
1048                            endpoint);
1049
1050   int rv = HandleAuthChallenge();
1051   if (rv != OK)
1052     return rv;
1053
1054   if (is_https_request())
1055     stream_->GetSSLInfo(&response_.ssl_info);
1056
1057   headers_valid_ = true;
1058
1059   if (session_->huffman_aggregator()) {
1060     session_->huffman_aggregator()->AggregateTransactionCharacterCounts(
1061         *request_,
1062         request_headers_,
1063         proxy_info_.proxy_server(),
1064         *response_.headers.get());
1065   }
1066   return OK;
1067 }
1068
1069 int HttpNetworkTransaction::DoReadBody() {
1070   DCHECK(read_buf_.get());
1071   DCHECK_GT(read_buf_len_, 0);
1072   DCHECK(stream_ != NULL);
1073
1074   next_state_ = STATE_READ_BODY_COMPLETE;
1075   return stream_->ReadResponseBody(
1076       read_buf_.get(), read_buf_len_, io_callback_);
1077 }
1078
1079 int HttpNetworkTransaction::DoReadBodyComplete(int result) {
1080   // We are done with the Read call.
1081   bool done = false;
1082   if (result <= 0) {
1083     DCHECK_NE(ERR_IO_PENDING, result);
1084     done = true;
1085   }
1086
1087   bool keep_alive = false;
1088   if (stream_->IsResponseBodyComplete()) {
1089     // Note: Just because IsResponseBodyComplete is true, we're not
1090     // necessarily "done".  We're only "done" when it is the last
1091     // read on this HttpNetworkTransaction, which will be signified
1092     // by a zero-length read.
1093     // TODO(mbelshe): The keepalive property is really a property of
1094     //    the stream.  No need to compute it here just to pass back
1095     //    to the stream's Close function.
1096     // TODO(rtenneti): CanFindEndOfResponse should return false if there are no
1097     // ResponseHeaders.
1098     if (stream_->CanFindEndOfResponse()) {
1099       HttpResponseHeaders* headers = GetResponseHeaders();
1100       if (headers)
1101         keep_alive = headers->IsKeepAlive();
1102     }
1103   }
1104
1105   // Clean up connection if we are done.
1106   if (done) {
1107     LogTransactionMetrics();
1108     stream_->Close(!keep_alive);
1109     // Note: we don't reset the stream here.  We've closed it, but we still
1110     // need it around so that callers can call methods such as
1111     // GetUploadProgress() and have them be meaningful.
1112     // TODO(mbelshe): This means we closed the stream here, and we close it
1113     // again in ~HttpNetworkTransaction.  Clean that up.
1114
1115     // The next Read call will return 0 (EOF).
1116   }
1117
1118   // Clear these to avoid leaving around old state.
1119   read_buf_ = NULL;
1120   read_buf_len_ = 0;
1121
1122   return result;
1123 }
1124
1125 int HttpNetworkTransaction::DoDrainBodyForAuthRestart() {
1126   // This method differs from DoReadBody only in the next_state_.  So we just
1127   // call DoReadBody and override the next_state_.  Perhaps there is a more
1128   // elegant way for these two methods to share code.
1129   int rv = DoReadBody();
1130   DCHECK(next_state_ == STATE_READ_BODY_COMPLETE);
1131   next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE;
1132   return rv;
1133 }
1134
1135 // TODO(wtc): This method and the DoReadBodyComplete method are almost
1136 // the same.  Figure out a good way for these two methods to share code.
1137 int HttpNetworkTransaction::DoDrainBodyForAuthRestartComplete(int result) {
1138   // keep_alive defaults to true because the very reason we're draining the
1139   // response body is to reuse the connection for auth restart.
1140   bool done = false, keep_alive = true;
1141   if (result < 0) {
1142     // Error or closed connection while reading the socket.
1143     done = true;
1144     keep_alive = false;
1145   } else if (stream_->IsResponseBodyComplete()) {
1146     done = true;
1147   }
1148
1149   if (done) {
1150     DidDrainBodyForAuthRestart(keep_alive);
1151   } else {
1152     // Keep draining.
1153     next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
1154   }
1155
1156   return OK;
1157 }
1158
1159 void HttpNetworkTransaction::LogTransactionConnectedMetrics() {
1160   if (logged_response_time_)
1161     return;
1162
1163   logged_response_time_ = true;
1164
1165   base::TimeDelta total_duration = response_.response_time - start_time_;
1166
1167   UMA_HISTOGRAM_CUSTOM_TIMES(
1168       "Net.Transaction_Connected",
1169       total_duration,
1170       base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
1171       100);
1172
1173   bool reused_socket = stream_->IsConnectionReused();
1174   if (!reused_socket) {
1175     UMA_HISTOGRAM_CUSTOM_TIMES(
1176         "Net.Transaction_Connected_New_b",
1177         total_duration,
1178         base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
1179         100);
1180   }
1181
1182   // Currently, non-HIGHEST priority requests are frame or sub-frame resource
1183   // types.  This will change when we also prioritize certain subresources like
1184   // css, js, etc.
1185   if (priority_ != HIGHEST) {
1186     UMA_HISTOGRAM_CUSTOM_TIMES(
1187         "Net.Priority_High_Latency_b",
1188         total_duration,
1189         base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
1190         100);
1191   } else {
1192     UMA_HISTOGRAM_CUSTOM_TIMES(
1193         "Net.Priority_Low_Latency_b",
1194         total_duration,
1195         base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
1196         100);
1197   }
1198 }
1199
1200 void HttpNetworkTransaction::LogTransactionMetrics() const {
1201   base::TimeDelta duration = base::Time::Now() -
1202                              response_.request_time;
1203   if (60 < duration.InMinutes())
1204     return;
1205
1206   base::TimeDelta total_duration = base::Time::Now() - start_time_;
1207
1208   UMA_HISTOGRAM_CUSTOM_TIMES("Net.Transaction_Latency_b", duration,
1209                              base::TimeDelta::FromMilliseconds(1),
1210                              base::TimeDelta::FromMinutes(10),
1211                              100);
1212   UMA_HISTOGRAM_CUSTOM_TIMES("Net.Transaction_Latency_Total",
1213                              total_duration,
1214                              base::TimeDelta::FromMilliseconds(1),
1215                              base::TimeDelta::FromMinutes(10), 100);
1216
1217   if (!stream_->IsConnectionReused()) {
1218     UMA_HISTOGRAM_CUSTOM_TIMES(
1219         "Net.Transaction_Latency_Total_New_Connection",
1220         total_duration, base::TimeDelta::FromMilliseconds(1),
1221         base::TimeDelta::FromMinutes(10), 100);
1222   }
1223 }
1224
1225 int HttpNetworkTransaction::HandleCertificateRequest(int error) {
1226   // There are two paths through which the server can request a certificate
1227   // from us.  The first is during the initial handshake, the second is
1228   // during SSL renegotiation.
1229   //
1230   // In both cases, we want to close the connection before proceeding.
1231   // We do this for two reasons:
1232   //   First, we don't want to keep the connection to the server hung for a
1233   //   long time while the user selects a certificate.
1234   //   Second, even if we did keep the connection open, NSS has a bug where
1235   //   restarting the handshake for ClientAuth is currently broken.
1236   DCHECK_EQ(error, ERR_SSL_CLIENT_AUTH_CERT_NEEDED);
1237
1238   if (stream_.get()) {
1239     // Since we already have a stream, we're being called as part of SSL
1240     // renegotiation.
1241     DCHECK(!stream_request_.get());
1242     total_received_bytes_ += stream_->GetTotalReceivedBytes();
1243     stream_->Close(true);
1244     stream_.reset();
1245   }
1246
1247   // The server is asking for a client certificate during the initial
1248   // handshake.
1249   stream_request_.reset();
1250
1251   // If the user selected one of the certificates in client_certs or declined
1252   // to provide one for this server before, use the past decision
1253   // automatically.
1254   scoped_refptr<X509Certificate> client_cert;
1255   bool found_cached_cert = session_->ssl_client_auth_cache()->Lookup(
1256       response_.cert_request_info->host_and_port, &client_cert);
1257   if (!found_cached_cert)
1258     return error;
1259
1260   // Check that the certificate selected is still a certificate the server
1261   // is likely to accept, based on the criteria supplied in the
1262   // CertificateRequest message.
1263   if (client_cert.get()) {
1264     const std::vector<std::string>& cert_authorities =
1265         response_.cert_request_info->cert_authorities;
1266
1267     bool cert_still_valid = cert_authorities.empty() ||
1268         client_cert->IsIssuedByEncoded(cert_authorities);
1269     if (!cert_still_valid)
1270       return error;
1271   }
1272
1273   // TODO(davidben): Add a unit test which covers this path; we need to be
1274   // able to send a legitimate certificate and also bypass/clear the
1275   // SSL session cache.
1276   SSLConfig* ssl_config = response_.cert_request_info->is_proxy ?
1277       &proxy_ssl_config_ : &server_ssl_config_;
1278   ssl_config->send_client_cert = true;
1279   ssl_config->client_cert = client_cert;
1280   next_state_ = STATE_CREATE_STREAM;
1281   // Reset the other member variables.
1282   // Note: this is necessary only with SSL renegotiation.
1283   ResetStateForRestart();
1284   return OK;
1285 }
1286
1287 void HttpNetworkTransaction::HandleClientAuthError(int error) {
1288   if (server_ssl_config_.send_client_cert &&
1289       (error == ERR_SSL_PROTOCOL_ERROR || IsClientCertificateError(error))) {
1290     session_->ssl_client_auth_cache()->Remove(
1291         HostPortPair::FromURL(request_->url));
1292   }
1293 }
1294
1295 // TODO(rch): This does not correctly handle errors when an SSL proxy is
1296 // being used, as all of the errors are handled as if they were generated
1297 // by the endpoint host, request_->url, rather than considering if they were
1298 // generated by the SSL proxy. http://crbug.com/69329
1299 int HttpNetworkTransaction::HandleSSLHandshakeError(int error) {
1300   DCHECK(request_);
1301   HandleClientAuthError(error);
1302
1303   bool should_fallback = false;
1304   uint16 version_max = server_ssl_config_.version_max;
1305
1306   switch (error) {
1307     case ERR_CONNECTION_CLOSED:
1308     case ERR_SSL_PROTOCOL_ERROR:
1309     case ERR_SSL_VERSION_OR_CIPHER_MISMATCH:
1310       if (version_max >= SSL_PROTOCOL_VERSION_TLS1 &&
1311           version_max > server_ssl_config_.version_min) {
1312         // This could be a TLS-intolerant server or a server that chose a
1313         // cipher suite defined only for higher protocol versions (such as
1314         // an SSL 3.0 server that chose a TLS-only cipher suite).  Fall
1315         // back to the next lower version and retry.
1316         // NOTE: if the SSLClientSocket class doesn't support TLS 1.1,
1317         // specifying TLS 1.1 in version_max will result in a TLS 1.0
1318         // handshake, so falling back from TLS 1.1 to TLS 1.0 will simply
1319         // repeat the TLS 1.0 handshake. To avoid this problem, the default
1320         // version_max should match the maximum protocol version supported
1321         // by the SSLClientSocket class.
1322         version_max--;
1323
1324         // Fallback to the lower SSL version.
1325         // While SSL 3.0 fallback should be eliminated because of security
1326         // reasons, there is a high risk of breaking the servers if this is
1327         // done in general.
1328         should_fallback = true;
1329       }
1330       break;
1331     case ERR_CONNECTION_RESET:
1332       if (version_max >= SSL_PROTOCOL_VERSION_TLS1_1 &&
1333           version_max > server_ssl_config_.version_min) {
1334         // Some network devices that inspect application-layer packets seem to
1335         // inject TCP reset packets to break the connections when they see TLS
1336         // 1.1 in ClientHello or ServerHello. See http://crbug.com/130293.
1337         //
1338         // Only allow ERR_CONNECTION_RESET to trigger a fallback from TLS 1.1 or
1339         // 1.2. We don't lose much in this fallback because the explicit IV for
1340         // CBC mode in TLS 1.1 is approximated by record splitting in TLS
1341         // 1.0. The fallback will be more painful for TLS 1.2 when we have GCM
1342         // support.
1343         //
1344         // ERR_CONNECTION_RESET is a common network error, so we don't want it
1345         // to trigger a version fallback in general, especially the TLS 1.0 ->
1346         // SSL 3.0 fallback, which would drop TLS extensions.
1347         version_max--;
1348         should_fallback = true;
1349       }
1350       break;
1351     case ERR_SSL_BAD_RECORD_MAC_ALERT:
1352       if (version_max >= SSL_PROTOCOL_VERSION_TLS1_1 &&
1353           version_max > server_ssl_config_.version_min) {
1354         // Some broken SSL devices negotiate TLS 1.0 when sent a TLS 1.1 or
1355         // 1.2 ClientHello, but then return a bad_record_mac alert. See
1356         // crbug.com/260358. In order to make the fallback as minimal as
1357         // possible, this fallback is only triggered for >= TLS 1.1.
1358         version_max--;
1359         should_fallback = true;
1360       }
1361       break;
1362     case ERR_SSL_INAPPROPRIATE_FALLBACK:
1363       // The server told us that we should not have fallen back. A buggy server
1364       // could trigger ERR_SSL_INAPPROPRIATE_FALLBACK with the initial
1365       // connection. |fallback_error_code_| is initialised to
1366       // ERR_SSL_INAPPROPRIATE_FALLBACK to catch this case.
1367       error = fallback_error_code_;
1368       break;
1369   }
1370
1371   if (should_fallback) {
1372     net_log_.AddEvent(
1373         NetLog::TYPE_SSL_VERSION_FALLBACK,
1374         base::Bind(&NetLogSSLVersionFallbackCallback,
1375                    &request_->url, error, server_ssl_config_.version_max,
1376                    version_max));
1377     fallback_error_code_ = error;
1378     server_ssl_config_.version_max = version_max;
1379     server_ssl_config_.version_fallback = true;
1380     ResetConnectionAndRequestForResend();
1381     error = OK;
1382   }
1383
1384   return error;
1385 }
1386
1387 // This method determines whether it is safe to resend the request after an
1388 // IO error.  It can only be called in response to request header or body
1389 // write errors or response header read errors.  It should not be used in
1390 // other cases, such as a Connect error.
1391 int HttpNetworkTransaction::HandleIOError(int error) {
1392   // Because the peer may request renegotiation with client authentication at
1393   // any time, check and handle client authentication errors.
1394   HandleClientAuthError(error);
1395
1396   switch (error) {
1397     // If we try to reuse a connection that the server is in the process of
1398     // closing, we may end up successfully writing out our request (or a
1399     // portion of our request) only to find a connection error when we try to
1400     // read from (or finish writing to) the socket.
1401     case ERR_CONNECTION_RESET:
1402     case ERR_CONNECTION_CLOSED:
1403     case ERR_CONNECTION_ABORTED:
1404     // There can be a race between the socket pool checking checking whether a
1405     // socket is still connected, receiving the FIN, and sending/reading data
1406     // on a reused socket.  If we receive the FIN between the connectedness
1407     // check and writing/reading from the socket, we may first learn the socket
1408     // is disconnected when we get a ERR_SOCKET_NOT_CONNECTED.  This will most
1409     // likely happen when trying to retrieve its IP address.
1410     // See http://crbug.com/105824 for more details.
1411     case ERR_SOCKET_NOT_CONNECTED:
1412     // If a socket is closed on its initial request, HttpStreamParser returns
1413     // ERR_EMPTY_RESPONSE. This may still be close/reuse race if the socket was
1414     // preconnected but failed to be used before the server timed it out.
1415     case ERR_EMPTY_RESPONSE:
1416       if (ShouldResendRequest()) {
1417         net_log_.AddEventWithNetErrorCode(
1418             NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR, error);
1419         ResetConnectionAndRequestForResend();
1420         error = OK;
1421       }
1422       break;
1423     case ERR_SPDY_PING_FAILED:
1424     case ERR_SPDY_SERVER_REFUSED_STREAM:
1425     case ERR_QUIC_HANDSHAKE_FAILED:
1426       net_log_.AddEventWithNetErrorCode(
1427           NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR, error);
1428       ResetConnectionAndRequestForResend();
1429       error = OK;
1430       break;
1431   }
1432   return error;
1433 }
1434
1435 void HttpNetworkTransaction::ResetStateForRestart() {
1436   ResetStateForAuthRestart();
1437   if (stream_)
1438     total_received_bytes_ += stream_->GetTotalReceivedBytes();
1439   stream_.reset();
1440 }
1441
1442 void HttpNetworkTransaction::ResetStateForAuthRestart() {
1443   send_start_time_ = base::TimeTicks();
1444   send_end_time_ = base::TimeTicks();
1445
1446   pending_auth_target_ = HttpAuth::AUTH_NONE;
1447   read_buf_ = NULL;
1448   read_buf_len_ = 0;
1449   headers_valid_ = false;
1450   request_headers_.Clear();
1451   response_ = HttpResponseInfo();
1452   establishing_tunnel_ = false;
1453 }
1454
1455 HttpResponseHeaders* HttpNetworkTransaction::GetResponseHeaders() const {
1456   return response_.headers.get();
1457 }
1458
1459 bool HttpNetworkTransaction::ShouldResendRequest() const {
1460   bool connection_is_proven = stream_->IsConnectionReused();
1461   bool has_received_headers = GetResponseHeaders() != NULL;
1462
1463   // NOTE: we resend a request only if we reused a keep-alive connection.
1464   // This automatically prevents an infinite resend loop because we'll run
1465   // out of the cached keep-alive connections eventually.
1466   if (connection_is_proven && !has_received_headers)
1467     return true;
1468   return false;
1469 }
1470
1471 void HttpNetworkTransaction::ResetConnectionAndRequestForResend() {
1472   if (stream_.get()) {
1473     stream_->Close(true);
1474     stream_.reset();
1475   }
1476
1477   // We need to clear request_headers_ because it contains the real request
1478   // headers, but we may need to resend the CONNECT request first to recreate
1479   // the SSL tunnel.
1480   request_headers_.Clear();
1481   next_state_ = STATE_CREATE_STREAM;  // Resend the request.
1482 }
1483
1484 bool HttpNetworkTransaction::ShouldApplyProxyAuth() const {
1485   return !is_https_request() &&
1486       (proxy_info_.is_https() || proxy_info_.is_http());
1487 }
1488
1489 bool HttpNetworkTransaction::ShouldApplyServerAuth() const {
1490   return !(request_->load_flags & LOAD_DO_NOT_SEND_AUTH_DATA);
1491 }
1492
1493 int HttpNetworkTransaction::HandleAuthChallenge() {
1494   scoped_refptr<HttpResponseHeaders> headers(GetResponseHeaders());
1495   DCHECK(headers.get());
1496
1497   int status = headers->response_code();
1498   if (status != HTTP_UNAUTHORIZED &&
1499       status != HTTP_PROXY_AUTHENTICATION_REQUIRED)
1500     return OK;
1501   HttpAuth::Target target = status == HTTP_PROXY_AUTHENTICATION_REQUIRED ?
1502                             HttpAuth::AUTH_PROXY : HttpAuth::AUTH_SERVER;
1503   if (target == HttpAuth::AUTH_PROXY && proxy_info_.is_direct())
1504     return ERR_UNEXPECTED_PROXY_AUTH;
1505
1506   // This case can trigger when an HTTPS server responds with a "Proxy
1507   // authentication required" status code through a non-authenticating
1508   // proxy.
1509   if (!auth_controllers_[target].get())
1510     return ERR_UNEXPECTED_PROXY_AUTH;
1511
1512   int rv = auth_controllers_[target]->HandleAuthChallenge(
1513       headers, (request_->load_flags & LOAD_DO_NOT_SEND_AUTH_DATA) != 0, false,
1514       net_log_);
1515   if (auth_controllers_[target]->HaveAuthHandler())
1516       pending_auth_target_ = target;
1517
1518   scoped_refptr<AuthChallengeInfo> auth_info =
1519       auth_controllers_[target]->auth_info();
1520   if (auth_info.get())
1521       response_.auth_challenge = auth_info;
1522
1523   return rv;
1524 }
1525
1526 bool HttpNetworkTransaction::HaveAuth(HttpAuth::Target target) const {
1527   return auth_controllers_[target].get() &&
1528       auth_controllers_[target]->HaveAuth();
1529 }
1530
1531 GURL HttpNetworkTransaction::AuthURL(HttpAuth::Target target) const {
1532   switch (target) {
1533     case HttpAuth::AUTH_PROXY: {
1534       if (!proxy_info_.proxy_server().is_valid() ||
1535           proxy_info_.proxy_server().is_direct()) {
1536         return GURL();  // There is no proxy server.
1537       }
1538       const char* scheme = proxy_info_.is_https() ? "https://" : "http://";
1539       return GURL(scheme +
1540                   proxy_info_.proxy_server().host_port_pair().ToString());
1541     }
1542     case HttpAuth::AUTH_SERVER:
1543       if (ForWebSocketHandshake()) {
1544         const GURL& url = request_->url;
1545         url::Replacements<char> ws_to_http;
1546         if (url.SchemeIs("ws")) {
1547           ws_to_http.SetScheme("http", url::Component(0, 4));
1548         } else {
1549           DCHECK(url.SchemeIs("wss"));
1550           ws_to_http.SetScheme("https", url::Component(0, 5));
1551         }
1552         return url.ReplaceComponents(ws_to_http);
1553       }
1554       return request_->url;
1555     default:
1556      return GURL();
1557   }
1558 }
1559
1560 bool HttpNetworkTransaction::ForWebSocketHandshake() const {
1561   return websocket_handshake_stream_base_create_helper_ &&
1562          request_->url.SchemeIsWSOrWSS();
1563 }
1564
1565 #define STATE_CASE(s) \
1566   case s: \
1567     description = base::StringPrintf("%s (0x%08X)", #s, s); \
1568     break
1569
1570 std::string HttpNetworkTransaction::DescribeState(State state) {
1571   std::string description;
1572   switch (state) {
1573     STATE_CASE(STATE_NOTIFY_BEFORE_CREATE_STREAM);
1574     STATE_CASE(STATE_CREATE_STREAM);
1575     STATE_CASE(STATE_CREATE_STREAM_COMPLETE);
1576     STATE_CASE(STATE_INIT_REQUEST_BODY);
1577     STATE_CASE(STATE_INIT_REQUEST_BODY_COMPLETE);
1578     STATE_CASE(STATE_BUILD_REQUEST);
1579     STATE_CASE(STATE_BUILD_REQUEST_COMPLETE);
1580     STATE_CASE(STATE_SEND_REQUEST);
1581     STATE_CASE(STATE_SEND_REQUEST_COMPLETE);
1582     STATE_CASE(STATE_READ_HEADERS);
1583     STATE_CASE(STATE_READ_HEADERS_COMPLETE);
1584     STATE_CASE(STATE_READ_BODY);
1585     STATE_CASE(STATE_READ_BODY_COMPLETE);
1586     STATE_CASE(STATE_DRAIN_BODY_FOR_AUTH_RESTART);
1587     STATE_CASE(STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE);
1588     STATE_CASE(STATE_NONE);
1589     default:
1590       description = base::StringPrintf("Unknown state 0x%08X (%u)", state,
1591                                        state);
1592       break;
1593   }
1594   return description;
1595 }
1596
1597 #undef STATE_CASE
1598
1599 }  // namespace net