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/profiler/scoped_tracker.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.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 namespace net {
  67
  68 namespace {
  69
  70 void ProcessAlternateProtocol(
  71     HttpNetworkSession* session,
  72     const HttpResponseHeaders& headers,
  73     const HostPortPair& http_host_port_pair) {
  74   if (!headers.HasHeader(kAlternateProtocolHeader))
  75     return;
  76
  77   std::vector<std::string> alternate_protocol_values;
  78   void* iter = NULL;
  79   std::string alternate_protocol_str;
  80   while (headers.EnumerateHeader(&iter, kAlternateProtocolHeader,
  81                                  &alternate_protocol_str)) {
  82     base::TrimWhitespaceASCII(alternate_protocol_str, base::TRIM_ALL,
  83                               &alternate_protocol_str);
  84     if (!alternate_protocol_str.empty()) {
  85       alternate_protocol_values.push_back(alternate_protocol_str);
  86     }
  87   }
  88
  89   session->http_stream_factory()->ProcessAlternateProtocol(
  90       session->http_server_properties(),
  91       alternate_protocol_values,
  92       http_host_port_pair,
  93       *session);
  94 }
  95
  96 base::Value* NetLogSSLVersionFallbackCallback(
  97     const GURL* url,
  98     int net_error,
  99     uint16 version_before,
 100     uint16 version_after,
 101     NetLog::LogLevel /* log_level */) {
 102   base::DictionaryValue* dict = new base::DictionaryValue();
 103   dict->SetString("host_and_port", GetHostAndPort(*url));
 104   dict->SetInteger("net_error", net_error);
 105   dict->SetInteger("version_before", version_before);
 106   dict->SetInteger("version_after", version_after);
 107   return dict;
 108 }
 109
 110 }  // namespace
 111
 112 //-----------------------------------------------------------------------------
 113
 114 HttpNetworkTransaction::HttpNetworkTransaction(RequestPriority priority,
 115                                                HttpNetworkSession* session)
 116     : pending_auth_target_(HttpAuth::AUTH_NONE),
 117       io_callback_(base::Bind(&HttpNetworkTransaction::OnIOComplete,
 118                               base::Unretained(this))),
 119       session_(session),
 120       request_(NULL),
 121       priority_(priority),
 122       headers_valid_(false),
 123       fallback_error_code_(ERR_SSL_INAPPROPRIATE_FALLBACK),
 124       request_headers_(),
 125       read_buf_len_(0),
 126       total_received_bytes_(0),
 127       next_state_(STATE_NONE),
 128       establishing_tunnel_(false),
 129       websocket_handshake_stream_base_create_helper_(NULL) {
 130   session->ssl_config_service()->GetSSLConfig(&server_ssl_config_);
 131   session->GetNextProtos(&server_ssl_config_.next_protos);
 132   proxy_ssl_config_ = server_ssl_config_;
 133 }
 134
 135 HttpNetworkTransaction::~HttpNetworkTransaction() {
 136   if (stream_.get()) {
 137     HttpResponseHeaders* headers = GetResponseHeaders();
 138     // TODO(mbelshe): The stream_ should be able to compute whether or not the
 139     //                stream should be kept alive.  No reason to compute here
 140     //                and pass it in.
 141     bool try_to_keep_alive =
 142         next_state_ == STATE_NONE &&
 143         stream_->CanFindEndOfResponse() &&
 144         (!headers || headers->IsKeepAlive());
 145     if (!try_to_keep_alive) {
 146       stream_->Close(true /* not reusable */);
 147     } else {
 148       if (stream_->IsResponseBodyComplete()) {
 149         // If the response body is complete, we can just reuse the socket.
 150         stream_->Close(false /* reusable */);
 151       } else if (stream_->IsSpdyHttpStream()) {
 152         // Doesn't really matter for SpdyHttpStream. Just close it.
 153         stream_->Close(true /* not reusable */);
 154       } else {
 155         // Otherwise, we try to drain the response body.
 156         HttpStream* stream = stream_.release();
 157         stream->Drain(session_);
 158       }
 159     }
 160   }
 161
 162   if (request_ && request_->upload_data_stream)
 163     request_->upload_data_stream->Reset();  // Invalidate pending callbacks.
 164 }
 165
 166 int HttpNetworkTransaction::Start(const HttpRequestInfo* request_info,
 167                                   const CompletionCallback& callback,
 168                                   const BoundNetLog& net_log) {
 169   net_log_ = net_log;
 170   request_ = request_info;
 171
 172   if (request_->load_flags & LOAD_DISABLE_CERT_REVOCATION_CHECKING) {
 173     server_ssl_config_.rev_checking_enabled = false;
 174     proxy_ssl_config_.rev_checking_enabled = false;
 175   }
 176
 177   if (request_->load_flags & LOAD_PREFETCH)
 178     response_.unused_since_prefetch = true;
 179
 180   // Channel ID is disabled if privacy mode is enabled for this request.
 181   if (request_->privacy_mode == PRIVACY_MODE_ENABLED)
 182     server_ssl_config_.channel_id_enabled = false;
 183
 184   if (server_ssl_config_.fastradio_padding_enabled) {
 185     server_ssl_config_.fastradio_padding_eligible =
 186         session_->ssl_config_service()->SupportsFastradioPadding(
 187             request_info->url);
 188   }
 189
 190   next_state_ = STATE_NOTIFY_BEFORE_CREATE_STREAM;
 191   int rv = DoLoop(OK);
 192   if (rv == ERR_IO_PENDING)
 193     callback_ = callback;
 194   return rv;
 195 }
 196
 197 int HttpNetworkTransaction::RestartIgnoringLastError(
 198     const CompletionCallback& callback) {
 199   DCHECK(!stream_.get());
 200   DCHECK(!stream_request_.get());
 201   DCHECK_EQ(STATE_NONE, next_state_);
 202
 203   next_state_ = STATE_CREATE_STREAM;
 204
 205   int rv = DoLoop(OK);
 206   if (rv == ERR_IO_PENDING)
 207     callback_ = callback;
 208   return rv;
 209 }
 210
 211 int HttpNetworkTransaction::RestartWithCertificate(
 212     X509Certificate* client_cert, const CompletionCallback& callback) {
 213   // In HandleCertificateRequest(), we always tear down existing stream
 214   // requests to force a new connection.  So we shouldn't have one here.
 215   DCHECK(!stream_request_.get());
 216   DCHECK(!stream_.get());
 217   DCHECK_EQ(STATE_NONE, next_state_);
 218
 219   SSLConfig* ssl_config = response_.cert_request_info->is_proxy ?
 220       &proxy_ssl_config_ : &server_ssl_config_;
 221   ssl_config->send_client_cert = true;
 222   ssl_config->client_cert = client_cert;
 223   session_->ssl_client_auth_cache()->Add(
 224       response_.cert_request_info->host_and_port, client_cert);
 225   // Reset the other member variables.
 226   // Note: this is necessary only with SSL renegotiation.
 227   ResetStateForRestart();
 228   next_state_ = STATE_CREATE_STREAM;
 229   int rv = DoLoop(OK);
 230   if (rv == ERR_IO_PENDING)
 231     callback_ = callback;
 232   return rv;
 233 }
 234
 235 int HttpNetworkTransaction::RestartWithAuth(
 236     const AuthCredentials& credentials, const CompletionCallback& callback) {
 237   HttpAuth::Target target = pending_auth_target_;
 238   if (target == HttpAuth::AUTH_NONE) {
 239     NOTREACHED();
 240     return ERR_UNEXPECTED;
 241   }
 242   pending_auth_target_ = HttpAuth::AUTH_NONE;
 243
 244   auth_controllers_[target]->ResetAuth(credentials);
 245
 246   DCHECK(callback_.is_null());
 247
 248   int rv = OK;
 249   if (target == HttpAuth::AUTH_PROXY && establishing_tunnel_) {
 250     // In this case, we've gathered credentials for use with proxy
 251     // authentication of a tunnel.
 252     DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 253     DCHECK(stream_request_ != NULL);
 254     auth_controllers_[target] = NULL;
 255     ResetStateForRestart();
 256     rv = stream_request_->RestartTunnelWithProxyAuth(credentials);
 257   } else {
 258     // In this case, we've gathered credentials for the server or the proxy
 259     // but it is not during the tunneling phase.
 260     DCHECK(stream_request_ == NULL);
 261     PrepareForAuthRestart(target);
 262     rv = DoLoop(OK);
 263   }
 264
 265   if (rv == ERR_IO_PENDING)
 266     callback_ = callback;
 267   return rv;
 268 }
 269
 270 void HttpNetworkTransaction::PrepareForAuthRestart(HttpAuth::Target target) {
 271   DCHECK(HaveAuth(target));
 272   DCHECK(!stream_request_.get());
 273
 274   bool keep_alive = false;
 275   // Even if the server says the connection is keep-alive, we have to be
 276   // able to find the end of each response in order to reuse the connection.
 277   if (GetResponseHeaders()->IsKeepAlive() &&
 278       stream_->CanFindEndOfResponse()) {
 279     // If the response body hasn't been completely read, we need to drain
 280     // it first.
 281     if (!stream_->IsResponseBodyComplete()) {
 282       next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
 283       read_buf_ = new IOBuffer(kDrainBodyBufferSize);  // A bit bucket.
 284       read_buf_len_ = kDrainBodyBufferSize;
 285       return;
 286     }
 287     keep_alive = true;
 288   }
 289
 290   // We don't need to drain the response body, so we act as if we had drained
 291   // the response body.
 292   DidDrainBodyForAuthRestart(keep_alive);
 293 }
 294
 295 void HttpNetworkTransaction::DidDrainBodyForAuthRestart(bool keep_alive) {
 296   DCHECK(!stream_request_.get());
 297
 298   if (stream_.get()) {
 299     total_received_bytes_ += stream_->GetTotalReceivedBytes();
 300     HttpStream* new_stream = NULL;
 301     if (keep_alive && stream_->IsConnectionReusable()) {
 302       // We should call connection_->set_idle_time(), but this doesn't occur
 303       // often enough to be worth the trouble.
 304       stream_->SetConnectionReused();
 305       new_stream = stream_->RenewStreamForAuth();
 306     }
 307
 308     if (!new_stream) {
 309       // Close the stream and mark it as not_reusable.  Even in the
 310       // keep_alive case, we've determined that the stream_ is not
 311       // reusable if new_stream is NULL.
 312       stream_->Close(true);
 313       next_state_ = STATE_CREATE_STREAM;
 314     } else {
 315       // Renewed streams shouldn't carry over received bytes.
 316       DCHECK_EQ(0, new_stream->GetTotalReceivedBytes());
 317       next_state_ = STATE_INIT_STREAM;
 318     }
 319     stream_.reset(new_stream);
 320   }
 321
 322   // Reset the other member variables.
 323   ResetStateForAuthRestart();
 324 }
 325
 326 bool HttpNetworkTransaction::IsReadyToRestartForAuth() {
 327   return pending_auth_target_ != HttpAuth::AUTH_NONE &&
 328       HaveAuth(pending_auth_target_);
 329 }
 330
 331 int HttpNetworkTransaction::Read(IOBuffer* buf, int buf_len,
 332                                  const CompletionCallback& callback) {
 333   DCHECK(buf);
 334   DCHECK_LT(0, buf_len);
 335
 336   State next_state = STATE_NONE;
 337
 338   scoped_refptr<HttpResponseHeaders> headers(GetResponseHeaders());
 339   if (headers_valid_ && headers.get() && stream_request_.get()) {
 340     // We're trying to read the body of the response but we're still trying
 341     // to establish an SSL tunnel through an HTTP proxy.  We can't read these
 342     // bytes when establishing a tunnel because they might be controlled by
 343     // an active network attacker.  We don't worry about this for HTTP
 344     // because an active network attacker can already control HTTP sessions.
 345     // We reach this case when the user cancels a 407 proxy auth prompt.  We
 346     // also don't worry about this for an HTTPS Proxy, because the
 347     // communication with the proxy is secure.
 348     // See http://crbug.com/8473.
 349     DCHECK(proxy_info_.is_http() || proxy_info_.is_https());
 350     DCHECK_EQ(headers->response_code(), HTTP_PROXY_AUTHENTICATION_REQUIRED);
 351     LOG(WARNING) << "Blocked proxy response with status "
 352                  << headers->response_code() << " to CONNECT request for "
 353                  << GetHostAndPort(request_->url) << ".";
 354     return ERR_TUNNEL_CONNECTION_FAILED;
 355   }
 356
 357   // Are we using SPDY or HTTP?
 358   next_state = STATE_READ_BODY;
 359
 360   read_buf_ = buf;
 361   read_buf_len_ = buf_len;
 362
 363   next_state_ = next_state;
 364   int rv = DoLoop(OK);
 365   if (rv == ERR_IO_PENDING)
 366     callback_ = callback;
 367   return rv;
 368 }
 369
 370 void HttpNetworkTransaction::StopCaching() {}
 371
 372 bool HttpNetworkTransaction::GetFullRequestHeaders(
 373     HttpRequestHeaders* headers) const {
 374   // TODO(ttuttle): Make sure we've populated request_headers_.
 375   *headers = request_headers_;
 376   return true;
 377 }
 378
 379 int64 HttpNetworkTransaction::GetTotalReceivedBytes() const {
 380   int64 total_received_bytes = total_received_bytes_;
 381   if (stream_)
 382     total_received_bytes += stream_->GetTotalReceivedBytes();
 383   return total_received_bytes;
 384 }
 385
 386 void HttpNetworkTransaction::DoneReading() {}
 387
 388 const HttpResponseInfo* HttpNetworkTransaction::GetResponseInfo() const {
 389   return ((headers_valid_ && response_.headers.get()) ||
 390           response_.ssl_info.cert.get() || response_.cert_request_info.get())
 391              ? &response_
 392              : NULL;
 393 }
 394
 395 LoadState HttpNetworkTransaction::GetLoadState() const {
 396   // TODO(wtc): Define a new LoadState value for the
 397   // STATE_INIT_CONNECTION_COMPLETE state, which delays the HTTP request.
 398   switch (next_state_) {
 399     case STATE_CREATE_STREAM:
 400       return LOAD_STATE_WAITING_FOR_DELEGATE;
 401     case STATE_CREATE_STREAM_COMPLETE:
 402       return stream_request_->GetLoadState();
 403     case STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE:
 404     case STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE:
 405     case STATE_SEND_REQUEST_COMPLETE:
 406       return LOAD_STATE_SENDING_REQUEST;
 407     case STATE_READ_HEADERS_COMPLETE:
 408       return LOAD_STATE_WAITING_FOR_RESPONSE;
 409     case STATE_READ_BODY_COMPLETE:
 410       return LOAD_STATE_READING_RESPONSE;
 411     default:
 412       return LOAD_STATE_IDLE;
 413   }
 414 }
 415
 416 UploadProgress HttpNetworkTransaction::GetUploadProgress() const {
 417   if (!stream_.get())
 418     return UploadProgress();
 419
 420   return stream_->GetUploadProgress();
 421 }
 422
 423 void HttpNetworkTransaction::SetQuicServerInfo(
 424     QuicServerInfo* quic_server_info) {}
 425
 426 bool HttpNetworkTransaction::GetLoadTimingInfo(
 427     LoadTimingInfo* load_timing_info) const {
 428   if (!stream_ || !stream_->GetLoadTimingInfo(load_timing_info))
 429     return false;
 430
 431   load_timing_info->proxy_resolve_start =
 432       proxy_info_.proxy_resolve_start_time();
 433   load_timing_info->proxy_resolve_end = proxy_info_.proxy_resolve_end_time();
 434   load_timing_info->send_start = send_start_time_;
 435   load_timing_info->send_end = send_end_time_;
 436   return true;
 437 }
 438
 439 void HttpNetworkTransaction::SetPriority(RequestPriority priority) {
 440   priority_ = priority;
 441   if (stream_request_)
 442     stream_request_->SetPriority(priority);
 443   if (stream_)
 444     stream_->SetPriority(priority);
 445 }
 446
 447 void HttpNetworkTransaction::SetWebSocketHandshakeStreamCreateHelper(
 448     WebSocketHandshakeStreamBase::CreateHelper* create_helper) {
 449   websocket_handshake_stream_base_create_helper_ = create_helper;
 450 }
 451
 452 void HttpNetworkTransaction::SetBeforeNetworkStartCallback(
 453     const BeforeNetworkStartCallback& callback) {
 454   before_network_start_callback_ = callback;
 455 }
 456
 457 void HttpNetworkTransaction::SetBeforeProxyHeadersSentCallback(
 458     const BeforeProxyHeadersSentCallback& callback) {
 459   before_proxy_headers_sent_callback_ = callback;
 460 }
 461
 462 int HttpNetworkTransaction::ResumeNetworkStart() {
 463   DCHECK_EQ(next_state_, STATE_CREATE_STREAM);
 464   return DoLoop(OK);
 465 }
 466
 467 void HttpNetworkTransaction::OnStreamReady(const SSLConfig& used_ssl_config,
 468                                            const ProxyInfo& used_proxy_info,
 469                                            HttpStream* stream) {
 470   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 471   DCHECK(stream_request_.get());
 472
 473   if (stream_)
 474     total_received_bytes_ += stream_->GetTotalReceivedBytes();
 475   stream_.reset(stream);
 476   server_ssl_config_ = used_ssl_config;
 477   proxy_info_ = used_proxy_info;
 478   response_.was_npn_negotiated = stream_request_->was_npn_negotiated();
 479   response_.npn_negotiated_protocol = SSLClientSocket::NextProtoToString(
 480       stream_request_->protocol_negotiated());
 481   response_.was_fetched_via_spdy = stream_request_->using_spdy();
 482   response_.was_fetched_via_proxy = !proxy_info_.is_direct();
 483   if (response_.was_fetched_via_proxy && !proxy_info_.is_empty())
 484     response_.proxy_server = proxy_info_.proxy_server().host_port_pair();
 485   OnIOComplete(OK);
 486 }
 487
 488 void HttpNetworkTransaction::OnWebSocketHandshakeStreamReady(
 489     const SSLConfig& used_ssl_config,
 490     const ProxyInfo& used_proxy_info,
 491     WebSocketHandshakeStreamBase* stream) {
 492   OnStreamReady(used_ssl_config, used_proxy_info, stream);
 493 }
 494
 495 void HttpNetworkTransaction::OnStreamFailed(int result,
 496                                             const SSLConfig& used_ssl_config) {
 497   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 498   DCHECK_NE(OK, result);
 499   DCHECK(stream_request_.get());
 500   DCHECK(!stream_.get());
 501   server_ssl_config_ = used_ssl_config;
 502
 503   OnIOComplete(result);
 504 }
 505
 506 void HttpNetworkTransaction::OnCertificateError(
 507     int result,
 508     const SSLConfig& used_ssl_config,
 509     const SSLInfo& ssl_info) {
 510   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 511   DCHECK_NE(OK, result);
 512   DCHECK(stream_request_.get());
 513   DCHECK(!stream_.get());
 514
 515   response_.ssl_info = ssl_info;
 516   server_ssl_config_ = used_ssl_config;
 517
 518   // TODO(mbelshe):  For now, we're going to pass the error through, and that
 519   // will close the stream_request in all cases.  This means that we're always
 520   // going to restart an entire STATE_CREATE_STREAM, even if the connection is
 521   // good and the user chooses to ignore the error.  This is not ideal, but not
 522   // the end of the world either.
 523
 524   OnIOComplete(result);
 525 }
 526
 527 void HttpNetworkTransaction::OnNeedsProxyAuth(
 528     const HttpResponseInfo& proxy_response,
 529     const SSLConfig& used_ssl_config,
 530     const ProxyInfo& used_proxy_info,
 531     HttpAuthController* auth_controller) {
 532   DCHECK(stream_request_.get());
 533   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 534
 535   establishing_tunnel_ = true;
 536   response_.headers = proxy_response.headers;
 537   response_.auth_challenge = proxy_response.auth_challenge;
 538   headers_valid_ = true;
 539   server_ssl_config_ = used_ssl_config;
 540   proxy_info_ = used_proxy_info;
 541
 542   auth_controllers_[HttpAuth::AUTH_PROXY] = auth_controller;
 543   pending_auth_target_ = HttpAuth::AUTH_PROXY;
 544
 545   DoCallback(OK);
 546 }
 547
 548 void HttpNetworkTransaction::OnNeedsClientAuth(
 549     const SSLConfig& used_ssl_config,
 550     SSLCertRequestInfo* cert_info) {
 551   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 552
 553   server_ssl_config_ = used_ssl_config;
 554   response_.cert_request_info = cert_info;
 555   OnIOComplete(ERR_SSL_CLIENT_AUTH_CERT_NEEDED);
 556 }
 557
 558 void HttpNetworkTransaction::OnHttpsProxyTunnelResponse(
 559     const HttpResponseInfo& response_info,
 560     const SSLConfig& used_ssl_config,
 561     const ProxyInfo& used_proxy_info,
 562     HttpStream* stream) {
 563   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 564
 565   headers_valid_ = true;
 566   response_ = response_info;
 567   server_ssl_config_ = used_ssl_config;
 568   proxy_info_ = used_proxy_info;
 569   if (stream_)
 570     total_received_bytes_ += stream_->GetTotalReceivedBytes();
 571   stream_.reset(stream);
 572   stream_request_.reset();  // we're done with the stream request
 573   OnIOComplete(ERR_HTTPS_PROXY_TUNNEL_RESPONSE);
 574 }
 575
 576 bool HttpNetworkTransaction::IsSecureRequest() const {
 577   return request_->url.SchemeIsSecure();
 578 }
 579
 580 bool HttpNetworkTransaction::UsingHttpProxyWithoutTunnel() const {
 581   return (proxy_info_.is_http() || proxy_info_.is_https() ||
 582           proxy_info_.is_quic()) &&
 583          !(request_->url.SchemeIs("https") || request_->url.SchemeIsWSOrWSS());
 584 }
 585
 586 void HttpNetworkTransaction::DoCallback(int rv) {
 587   DCHECK_NE(rv, ERR_IO_PENDING);
 588   DCHECK(!callback_.is_null());
 589
 590   // Since Run may result in Read being called, clear user_callback_ up front.
 591   CompletionCallback c = callback_;
 592   callback_.Reset();
 593   c.Run(rv);
 594 }
 595
 596 void HttpNetworkTransaction::OnIOComplete(int result) {
 597   // TODO(vadimt): Remove ScopedTracker below once crbug.com/424359 is fixed.
 598   tracked_objects::ScopedTracker tracking_profile1(
 599       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 600           "424359 HttpNetworkTransaction::OnIOComplete 1"));
 601
 602   int rv = DoLoop(result);
 603
 604   // TODO(vadimt): Remove ScopedTracker below once crbug.com/424359 is fixed.
 605   tracked_objects::ScopedTracker tracking_profile2(
 606       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 607           "424359 HttpNetworkTransaction::OnIOComplete 2"));
 608
 609   if (rv != ERR_IO_PENDING)
 610     DoCallback(rv);
 611 }
 612
 613 int HttpNetworkTransaction::DoLoop(int result) {
 614   DCHECK(next_state_ != STATE_NONE);
 615
 616   int rv = result;
 617   do {
 618     State state = next_state_;
 619     next_state_ = STATE_NONE;
 620     switch (state) {
 621       case STATE_NOTIFY_BEFORE_CREATE_STREAM:
 622         DCHECK_EQ(OK, rv);
 623         rv = DoNotifyBeforeCreateStream();
 624         break;
 625       case STATE_CREATE_STREAM:
 626         DCHECK_EQ(OK, rv);
 627         rv = DoCreateStream();
 628         break;
 629       case STATE_CREATE_STREAM_COMPLETE:
 630         rv = DoCreateStreamComplete(rv);
 631         break;
 632       case STATE_INIT_STREAM:
 633         DCHECK_EQ(OK, rv);
 634         rv = DoInitStream();
 635         break;
 636       case STATE_INIT_STREAM_COMPLETE:
 637         rv = DoInitStreamComplete(rv);
 638         break;
 639       case STATE_GENERATE_PROXY_AUTH_TOKEN:
 640         DCHECK_EQ(OK, rv);
 641         rv = DoGenerateProxyAuthToken();
 642         break;
 643       case STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE:
 644         rv = DoGenerateProxyAuthTokenComplete(rv);
 645         break;
 646       case STATE_GENERATE_SERVER_AUTH_TOKEN:
 647         DCHECK_EQ(OK, rv);
 648         rv = DoGenerateServerAuthToken();
 649         break;
 650       case STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE:
 651         rv = DoGenerateServerAuthTokenComplete(rv);
 652         break;
 653       case STATE_INIT_REQUEST_BODY:
 654         DCHECK_EQ(OK, rv);
 655         rv = DoInitRequestBody();
 656         break;
 657       case STATE_INIT_REQUEST_BODY_COMPLETE:
 658         rv = DoInitRequestBodyComplete(rv);
 659         break;
 660       case STATE_BUILD_REQUEST:
 661         DCHECK_EQ(OK, rv);
 662         net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_SEND_REQUEST);
 663         rv = DoBuildRequest();
 664         break;
 665       case STATE_BUILD_REQUEST_COMPLETE:
 666         rv = DoBuildRequestComplete(rv);
 667         break;
 668       case STATE_SEND_REQUEST:
 669         DCHECK_EQ(OK, rv);
 670         rv = DoSendRequest();
 671         break;
 672       case STATE_SEND_REQUEST_COMPLETE:
 673         rv = DoSendRequestComplete(rv);
 674         net_log_.EndEventWithNetErrorCode(
 675             NetLog::TYPE_HTTP_TRANSACTION_SEND_REQUEST, rv);
 676         break;
 677       case STATE_READ_HEADERS:
 678         DCHECK_EQ(OK, rv);
 679         net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_READ_HEADERS);
 680         rv = DoReadHeaders();
 681         break;
 682       case STATE_READ_HEADERS_COMPLETE:
 683         rv = DoReadHeadersComplete(rv);
 684         net_log_.EndEventWithNetErrorCode(
 685             NetLog::TYPE_HTTP_TRANSACTION_READ_HEADERS, rv);
 686         break;
 687       case STATE_READ_BODY:
 688         DCHECK_EQ(OK, rv);
 689         net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_READ_BODY);
 690         rv = DoReadBody();
 691         break;
 692       case STATE_READ_BODY_COMPLETE:
 693         rv = DoReadBodyComplete(rv);
 694         net_log_.EndEventWithNetErrorCode(
 695             NetLog::TYPE_HTTP_TRANSACTION_READ_BODY, rv);
 696         break;
 697       case STATE_DRAIN_BODY_FOR_AUTH_RESTART:
 698         DCHECK_EQ(OK, rv);
 699         net_log_.BeginEvent(
 700             NetLog::TYPE_HTTP_TRANSACTION_DRAIN_BODY_FOR_AUTH_RESTART);
 701         rv = DoDrainBodyForAuthRestart();
 702         break;
 703       case STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE:
 704         rv = DoDrainBodyForAuthRestartComplete(rv);
 705         net_log_.EndEventWithNetErrorCode(
 706             NetLog::TYPE_HTTP_TRANSACTION_DRAIN_BODY_FOR_AUTH_RESTART, rv);
 707         break;
 708       default:
 709         NOTREACHED() << "bad state";
 710         rv = ERR_FAILED;
 711         break;
 712     }
 713   } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
 714
 715   return rv;
 716 }
 717
 718 int HttpNetworkTransaction::DoNotifyBeforeCreateStream() {
 719   next_state_ = STATE_CREATE_STREAM;
 720   bool defer = false;
 721   if (!before_network_start_callback_.is_null())
 722     before_network_start_callback_.Run(&defer);
 723   if (!defer)
 724     return OK;
 725   return ERR_IO_PENDING;
 726 }
 727
 728 int HttpNetworkTransaction::DoCreateStream() {
 729   next_state_ = STATE_CREATE_STREAM_COMPLETE;
 730   if (ForWebSocketHandshake()) {
 731     stream_request_.reset(
 732         session_->http_stream_factory_for_websocket()
 733             ->RequestWebSocketHandshakeStream(
 734                   *request_,
 735                   priority_,
 736                   server_ssl_config_,
 737                   proxy_ssl_config_,
 738                   this,
 739                   websocket_handshake_stream_base_create_helper_,
 740                   net_log_));
 741   } else {
 742     stream_request_.reset(
 743         session_->http_stream_factory()->RequestStream(
 744             *request_,
 745             priority_,
 746             server_ssl_config_,
 747             proxy_ssl_config_,
 748             this,
 749             net_log_));
 750   }
 751   DCHECK(stream_request_.get());
 752   return ERR_IO_PENDING;
 753 }
 754
 755 int HttpNetworkTransaction::DoCreateStreamComplete(int result) {
 756   if (result == OK) {
 757     next_state_ = STATE_INIT_STREAM;
 758     DCHECK(stream_.get());
 759   } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
 760     result = HandleCertificateRequest(result);
 761   } else if (result == ERR_HTTPS_PROXY_TUNNEL_RESPONSE) {
 762     // Return OK and let the caller read the proxy's error page
 763     next_state_ = STATE_NONE;
 764     return OK;
 765   } else if (result == ERR_HTTP_1_1_REQUIRED ||
 766              result == ERR_PROXY_HTTP_1_1_REQUIRED) {
 767     return HandleHttp11Required(result);
 768   }
 769
 770   // Handle possible handshake errors that may have occurred if the stream
 771   // used SSL for one or more of the layers.
 772   result = HandleSSLHandshakeError(result);
 773
 774   // At this point we are done with the stream_request_.
 775   stream_request_.reset();
 776   return result;
 777 }
 778
 779 int HttpNetworkTransaction::DoInitStream() {
 780   DCHECK(stream_.get());
 781   next_state_ = STATE_INIT_STREAM_COMPLETE;
 782   return stream_->InitializeStream(request_, priority_, net_log_, io_callback_);
 783 }
 784
 785 int HttpNetworkTransaction::DoInitStreamComplete(int result) {
 786   if (result == OK) {
 787     next_state_ = STATE_GENERATE_PROXY_AUTH_TOKEN;
 788   } else {
 789     if (result < 0)
 790       result = HandleIOError(result);
 791
 792     // The stream initialization failed, so this stream will never be useful.
 793     if (stream_)
 794         total_received_bytes_ += stream_->GetTotalReceivedBytes();
 795     stream_.reset();
 796   }
 797
 798   return result;
 799 }
 800
 801 int HttpNetworkTransaction::DoGenerateProxyAuthToken() {
 802   next_state_ = STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE;
 803   if (!ShouldApplyProxyAuth())
 804     return OK;
 805   HttpAuth::Target target = HttpAuth::AUTH_PROXY;
 806   if (!auth_controllers_[target].get())
 807     auth_controllers_[target] =
 808         new HttpAuthController(target,
 809                                AuthURL(target),
 810                                session_->http_auth_cache(),
 811                                session_->http_auth_handler_factory());
 812   return auth_controllers_[target]->MaybeGenerateAuthToken(request_,
 813                                                            io_callback_,
 814                                                            net_log_);
 815 }
 816
 817 int HttpNetworkTransaction::DoGenerateProxyAuthTokenComplete(int rv) {
 818   DCHECK_NE(ERR_IO_PENDING, rv);
 819   if (rv == OK)
 820     next_state_ = STATE_GENERATE_SERVER_AUTH_TOKEN;
 821   return rv;
 822 }
 823
 824 int HttpNetworkTransaction::DoGenerateServerAuthToken() {
 825   next_state_ = STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE;
 826   HttpAuth::Target target = HttpAuth::AUTH_SERVER;
 827   if (!auth_controllers_[target].get()) {
 828     auth_controllers_[target] =
 829         new HttpAuthController(target,
 830                                AuthURL(target),
 831                                session_->http_auth_cache(),
 832                                session_->http_auth_handler_factory());
 833     if (request_->load_flags & LOAD_DO_NOT_USE_EMBEDDED_IDENTITY)
 834       auth_controllers_[target]->DisableEmbeddedIdentity();
 835   }
 836   if (!ShouldApplyServerAuth())
 837     return OK;
 838   return auth_controllers_[target]->MaybeGenerateAuthToken(request_,
 839                                                            io_callback_,
 840                                                            net_log_);
 841 }
 842
 843 int HttpNetworkTransaction::DoGenerateServerAuthTokenComplete(int rv) {
 844   DCHECK_NE(ERR_IO_PENDING, rv);
 845   if (rv == OK)
 846     next_state_ = STATE_INIT_REQUEST_BODY;
 847   return rv;
 848 }
 849
 850 void HttpNetworkTransaction::BuildRequestHeaders(
 851     bool using_http_proxy_without_tunnel) {
 852   request_headers_.SetHeader(HttpRequestHeaders::kHost,
 853                              GetHostAndOptionalPort(request_->url));
 854
 855   // For compat with HTTP/1.0 servers and proxies:
 856   if (using_http_proxy_without_tunnel) {
 857     request_headers_.SetHeader(HttpRequestHeaders::kProxyConnection,
 858                                "keep-alive");
 859   } else {
 860     request_headers_.SetHeader(HttpRequestHeaders::kConnection, "keep-alive");
 861   }
 862
 863   // Add a content length header?
 864   if (request_->upload_data_stream) {
 865     if (request_->upload_data_stream->is_chunked()) {
 866       request_headers_.SetHeader(
 867           HttpRequestHeaders::kTransferEncoding, "chunked");
 868     } else {
 869       request_headers_.SetHeader(
 870           HttpRequestHeaders::kContentLength,
 871           base::Uint64ToString(request_->upload_data_stream->size()));
 872     }
 873   } else if (request_->method == "POST" || request_->method == "PUT" ||
 874              request_->method == "HEAD") {
 875     // An empty POST/PUT request still needs a content length.  As for HEAD,
 876     // IE and Safari also add a content length header.  Presumably it is to
 877     // support sending a HEAD request to an URL that only expects to be sent a
 878     // POST or some other method that normally would have a message body.
 879     request_headers_.SetHeader(HttpRequestHeaders::kContentLength, "0");
 880   }
 881
 882   // Honor load flags that impact proxy caches.
 883   if (request_->load_flags & LOAD_BYPASS_CACHE) {
 884     request_headers_.SetHeader(HttpRequestHeaders::kPragma, "no-cache");
 885     request_headers_.SetHeader(HttpRequestHeaders::kCacheControl, "no-cache");
 886   } else if (request_->load_flags & LOAD_VALIDATE_CACHE) {
 887     request_headers_.SetHeader(HttpRequestHeaders::kCacheControl, "max-age=0");
 888   }
 889
 890   if (ShouldApplyProxyAuth() && HaveAuth(HttpAuth::AUTH_PROXY))
 891     auth_controllers_[HttpAuth::AUTH_PROXY]->AddAuthorizationHeader(
 892         &request_headers_);
 893   if (ShouldApplyServerAuth() && HaveAuth(HttpAuth::AUTH_SERVER))
 894     auth_controllers_[HttpAuth::AUTH_SERVER]->AddAuthorizationHeader(
 895         &request_headers_);
 896
 897   request_headers_.MergeFrom(request_->extra_headers);
 898
 899   if (using_http_proxy_without_tunnel &&
 900       !before_proxy_headers_sent_callback_.is_null())
 901     before_proxy_headers_sent_callback_.Run(proxy_info_, &request_headers_);
 902
 903   response_.did_use_http_auth =
 904       request_headers_.HasHeader(HttpRequestHeaders::kAuthorization) ||
 905       request_headers_.HasHeader(HttpRequestHeaders::kProxyAuthorization);
 906 }
 907
 908 int HttpNetworkTransaction::DoInitRequestBody() {
 909   next_state_ = STATE_INIT_REQUEST_BODY_COMPLETE;
 910   int rv = OK;
 911   if (request_->upload_data_stream)
 912     rv = request_->upload_data_stream->Init(io_callback_);
 913   return rv;
 914 }
 915
 916 int HttpNetworkTransaction::DoInitRequestBodyComplete(int result) {
 917   if (result == OK)
 918     next_state_ = STATE_BUILD_REQUEST;
 919   return result;
 920 }
 921
 922 int HttpNetworkTransaction::DoBuildRequest() {
 923   next_state_ = STATE_BUILD_REQUEST_COMPLETE;
 924   headers_valid_ = false;
 925
 926   // This is constructed lazily (instead of within our Start method), so that
 927   // we have proxy info available.
 928   if (request_headers_.IsEmpty()) {
 929     bool using_http_proxy_without_tunnel = UsingHttpProxyWithoutTunnel();
 930     BuildRequestHeaders(using_http_proxy_without_tunnel);
 931   }
 932
 933   return OK;
 934 }
 935
 936 int HttpNetworkTransaction::DoBuildRequestComplete(int result) {
 937   if (result == OK)
 938     next_state_ = STATE_SEND_REQUEST;
 939   return result;
 940 }
 941
 942 int HttpNetworkTransaction::DoSendRequest() {
 943   send_start_time_ = base::TimeTicks::Now();
 944   next_state_ = STATE_SEND_REQUEST_COMPLETE;
 945
 946   return stream_->SendRequest(request_headers_, &response_, io_callback_);
 947 }
 948
 949 int HttpNetworkTransaction::DoSendRequestComplete(int result) {
 950   send_end_time_ = base::TimeTicks::Now();
 951   if (result < 0)
 952     return HandleIOError(result);
 953   response_.network_accessed = true;
 954   next_state_ = STATE_READ_HEADERS;
 955   return OK;
 956 }
 957
 958 int HttpNetworkTransaction::DoReadHeaders() {
 959   next_state_ = STATE_READ_HEADERS_COMPLETE;
 960   return stream_->ReadResponseHeaders(io_callback_);
 961 }
 962
 963 int HttpNetworkTransaction::DoReadHeadersComplete(int result) {
 964   // We can get a certificate error or ERR_SSL_CLIENT_AUTH_CERT_NEEDED here
 965   // due to SSL renegotiation.
 966   if (IsCertificateError(result)) {
 967     // We don't handle a certificate error during SSL renegotiation, so we
 968     // have to return an error that's not in the certificate error range
 969     // (-2xx).
 970     LOG(ERROR) << "Got a server certificate with error " << result
 971                << " during SSL renegotiation";
 972     result = ERR_CERT_ERROR_IN_SSL_RENEGOTIATION;
 973   } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
 974     // TODO(wtc): Need a test case for this code path!
 975     DCHECK(stream_.get());
 976     DCHECK(IsSecureRequest());
 977     response_.cert_request_info = new SSLCertRequestInfo;
 978     stream_->GetSSLCertRequestInfo(response_.cert_request_info.get());
 979     result = HandleCertificateRequest(result);
 980     if (result == OK)
 981       return result;
 982   }
 983
 984   if (result == ERR_HTTP_1_1_REQUIRED ||
 985       result == ERR_PROXY_HTTP_1_1_REQUIRED) {
 986     return HandleHttp11Required(result);
 987   }
 988
 989   // ERR_CONNECTION_CLOSED is treated differently at this point; if partial
 990   // response headers were received, we do the best we can to make sense of it
 991   // and send it back up the stack.
 992   //
 993   // TODO(davidben): Consider moving this to HttpBasicStream, It's a little
 994   // bizarre for SPDY. Assuming this logic is useful at all.
 995   // TODO(davidben): Bubble the error code up so we do not cache?
 996   if (result == ERR_CONNECTION_CLOSED && response_.headers.get())
 997     result = OK;
 998
 999   if (result < 0)
1000     return HandleIOError(result);
1001
1002   DCHECK(response_.headers.get());
1003
1004   // On a 408 response from the server ("Request Timeout") on a stale socket,
1005   // retry the request.
1006   // Headers can be NULL because of http://crbug.com/384554.
1007   if (response_.headers.get() && response_.headers->response_code() == 408 &&
1008       stream_->IsConnectionReused()) {
1009     net_log_.AddEventWithNetErrorCode(
1010         NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR,
1011         response_.headers->response_code());
1012     // This will close the socket - it would be weird to try and reuse it, even
1013     // if the server doesn't actually close it.
1014     ResetConnectionAndRequestForResend();
1015     return OK;
1016   }
1017
1018   // Like Net.HttpResponseCode, but only for MAIN_FRAME loads.
1019   if (request_->load_flags & LOAD_MAIN_FRAME) {
1020     const int response_code = response_.headers->response_code();
1021     UMA_HISTOGRAM_ENUMERATION(
1022         "Net.HttpResponseCode_Nxx_MainFrame", response_code/100, 10);
1023   }
1024
1025   net_log_.AddEvent(
1026       NetLog::TYPE_HTTP_TRANSACTION_READ_RESPONSE_HEADERS,
1027       base::Bind(&HttpResponseHeaders::NetLogCallback, response_.headers));
1028
1029   if (response_.headers->GetParsedHttpVersion() < HttpVersion(1, 0)) {
1030     // HTTP/0.9 doesn't support the PUT method, so lack of response headers
1031     // indicates a buggy server.  See:
1032     // https://bugzilla.mozilla.org/show_bug.cgi?id=193921
1033     if (request_->method == "PUT")
1034       return ERR_METHOD_NOT_SUPPORTED;
1035   }
1036
1037   // Check for an intermediate 100 Continue response.  An origin server is
1038   // allowed to send this response even if we didn't ask for it, so we just
1039   // need to skip over it.
1040   // We treat any other 1xx in this same way (although in practice getting
1041   // a 1xx that isn't a 100 is rare).
1042   // Unless this is a WebSocket request, in which case we pass it on up.
1043   if (response_.headers->response_code() / 100 == 1 &&
1044       !ForWebSocketHandshake()) {
1045     response_.headers = new HttpResponseHeaders(std::string());
1046     next_state_ = STATE_READ_HEADERS;
1047     return OK;
1048   }
1049
1050   ProcessAlternateProtocol(session_, *response_.headers.get(),
1051                            HostPortPair::FromURL(request_->url));
1052
1053   int rv = HandleAuthChallenge();
1054   if (rv != OK)
1055     return rv;
1056
1057   if (IsSecureRequest())
1058     stream_->GetSSLInfo(&response_.ssl_info);
1059
1060   headers_valid_ = true;
1061
1062   if (session_->huffman_aggregator()) {
1063     session_->huffman_aggregator()->AggregateTransactionCharacterCounts(
1064         *request_,
1065         request_headers_,
1066         proxy_info_.proxy_server(),
1067         *response_.headers.get());
1068   }
1069   return OK;
1070 }
1071
1072 int HttpNetworkTransaction::DoReadBody() {
1073   DCHECK(read_buf_.get());
1074   DCHECK_GT(read_buf_len_, 0);
1075   DCHECK(stream_ != NULL);
1076
1077   next_state_ = STATE_READ_BODY_COMPLETE;
1078   return stream_->ReadResponseBody(
1079       read_buf_.get(), read_buf_len_, io_callback_);
1080 }
1081
1082 int HttpNetworkTransaction::DoReadBodyComplete(int result) {
1083   // We are done with the Read call.
1084   bool done = false;
1085   if (result <= 0) {
1086     DCHECK_NE(ERR_IO_PENDING, result);
1087     done = true;
1088   }
1089
1090   bool keep_alive = false;
1091   if (stream_->IsResponseBodyComplete()) {
1092     // Note: Just because IsResponseBodyComplete is true, we're not
1093     // necessarily "done".  We're only "done" when it is the last
1094     // read on this HttpNetworkTransaction, which will be signified
1095     // by a zero-length read.
1096     // TODO(mbelshe): The keepalive property is really a property of
1097     //    the stream.  No need to compute it here just to pass back
1098     //    to the stream's Close function.
1099     // TODO(rtenneti): CanFindEndOfResponse should return false if there are no
1100     // ResponseHeaders.
1101     if (stream_->CanFindEndOfResponse()) {
1102       HttpResponseHeaders* headers = GetResponseHeaders();
1103       if (headers)
1104         keep_alive = headers->IsKeepAlive();
1105     }
1106   }
1107
1108   // Clean up connection if we are done.
1109   if (done) {
1110     stream_->Close(!keep_alive);
1111     // Note: we don't reset the stream here.  We've closed it, but we still
1112     // need it around so that callers can call methods such as
1113     // GetUploadProgress() and have them be meaningful.
1114     // TODO(mbelshe): This means we closed the stream here, and we close it
1115     // again in ~HttpNetworkTransaction.  Clean that up.
1116
1117     // The next Read call will return 0 (EOF).
1118   }
1119
1120   // Clear these to avoid leaving around old state.
1121   read_buf_ = NULL;
1122   read_buf_len_ = 0;
1123
1124   return result;
1125 }
1126
1127 int HttpNetworkTransaction::DoDrainBodyForAuthRestart() {
1128   // This method differs from DoReadBody only in the next_state_.  So we just
1129   // call DoReadBody and override the next_state_.  Perhaps there is a more
1130   // elegant way for these two methods to share code.
1131   int rv = DoReadBody();
1132   DCHECK(next_state_ == STATE_READ_BODY_COMPLETE);
1133   next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE;
1134   return rv;
1135 }
1136
1137 // TODO(wtc): This method and the DoReadBodyComplete method are almost
1138 // the same.  Figure out a good way for these two methods to share code.
1139 int HttpNetworkTransaction::DoDrainBodyForAuthRestartComplete(int result) {
1140   // keep_alive defaults to true because the very reason we're draining the
1141   // response body is to reuse the connection for auth restart.
1142   bool done = false, keep_alive = true;
1143   if (result < 0) {
1144     // Error or closed connection while reading the socket.
1145     done = true;
1146     keep_alive = false;
1147   } else if (stream_->IsResponseBodyComplete()) {
1148     done = true;
1149   }
1150
1151   if (done) {
1152     DidDrainBodyForAuthRestart(keep_alive);
1153   } else {
1154     // Keep draining.
1155     next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
1156   }
1157
1158   return OK;
1159 }
1160
1161 int HttpNetworkTransaction::HandleCertificateRequest(int error) {
1162   // There are two paths through which the server can request a certificate
1163   // from us.  The first is during the initial handshake, the second is
1164   // during SSL renegotiation.
1165   //
1166   // In both cases, we want to close the connection before proceeding.
1167   // We do this for two reasons:
1168   //   First, we don't want to keep the connection to the server hung for a
1169   //   long time while the user selects a certificate.
1170   //   Second, even if we did keep the connection open, NSS has a bug where
1171   //   restarting the handshake for ClientAuth is currently broken.
1172   DCHECK_EQ(error, ERR_SSL_CLIENT_AUTH_CERT_NEEDED);
1173
1174   if (stream_.get()) {
1175     // Since we already have a stream, we're being called as part of SSL
1176     // renegotiation.
1177     DCHECK(!stream_request_.get());
1178     total_received_bytes_ += stream_->GetTotalReceivedBytes();
1179     stream_->Close(true);
1180     stream_.reset();
1181   }
1182
1183   // The server is asking for a client certificate during the initial
1184   // handshake.
1185   stream_request_.reset();
1186
1187   // If the user selected one of the certificates in client_certs or declined
1188   // to provide one for this server before, use the past decision
1189   // automatically.
1190   scoped_refptr<X509Certificate> client_cert;
1191   bool found_cached_cert = session_->ssl_client_auth_cache()->Lookup(
1192       response_.cert_request_info->host_and_port, &client_cert);
1193   if (!found_cached_cert)
1194     return error;
1195
1196   // Check that the certificate selected is still a certificate the server
1197   // is likely to accept, based on the criteria supplied in the
1198   // CertificateRequest message.
1199   if (client_cert.get()) {
1200     const std::vector<std::string>& cert_authorities =
1201         response_.cert_request_info->cert_authorities;
1202
1203     bool cert_still_valid = cert_authorities.empty() ||
1204         client_cert->IsIssuedByEncoded(cert_authorities);
1205     if (!cert_still_valid)
1206       return error;
1207   }
1208
1209   // TODO(davidben): Add a unit test which covers this path; we need to be
1210   // able to send a legitimate certificate and also bypass/clear the
1211   // SSL session cache.
1212   SSLConfig* ssl_config = response_.cert_request_info->is_proxy ?
1213       &proxy_ssl_config_ : &server_ssl_config_;
1214   ssl_config->send_client_cert = true;
1215   ssl_config->client_cert = client_cert;
1216   next_state_ = STATE_CREATE_STREAM;
1217   // Reset the other member variables.
1218   // Note: this is necessary only with SSL renegotiation.
1219   ResetStateForRestart();
1220   return OK;
1221 }
1222
1223 int HttpNetworkTransaction::HandleHttp11Required(int error) {
1224   DCHECK(error == ERR_HTTP_1_1_REQUIRED ||
1225          error == ERR_PROXY_HTTP_1_1_REQUIRED);
1226
1227   if (error == ERR_HTTP_1_1_REQUIRED) {
1228     HttpServerProperties::ForceHTTP11(&server_ssl_config_);
1229   } else {
1230     HttpServerProperties::ForceHTTP11(&proxy_ssl_config_);
1231   }
1232   ResetConnectionAndRequestForResend();
1233   return OK;
1234 }
1235
1236 void HttpNetworkTransaction::HandleClientAuthError(int error) {
1237   if (server_ssl_config_.send_client_cert &&
1238       (error == ERR_SSL_PROTOCOL_ERROR || IsClientCertificateError(error))) {
1239     session_->ssl_client_auth_cache()->Remove(
1240         HostPortPair::FromURL(request_->url));
1241   }
1242 }
1243
1244 // TODO(rch): This does not correctly handle errors when an SSL proxy is
1245 // being used, as all of the errors are handled as if they were generated
1246 // by the endpoint host, request_->url, rather than considering if they were
1247 // generated by the SSL proxy. http://crbug.com/69329
1248 int HttpNetworkTransaction::HandleSSLHandshakeError(int error) {
1249   DCHECK(request_);
1250   HandleClientAuthError(error);
1251
1252   bool should_fallback = false;
1253   uint16 version_max = server_ssl_config_.version_max;
1254
1255   switch (error) {
1256     case ERR_CONNECTION_CLOSED:
1257     case ERR_SSL_PROTOCOL_ERROR:
1258     case ERR_SSL_VERSION_OR_CIPHER_MISMATCH:
1259       if (version_max >= SSL_PROTOCOL_VERSION_TLS1 &&
1260           version_max > server_ssl_config_.version_min) {
1261         // This could be a TLS-intolerant server or a server that chose a
1262         // cipher suite defined only for higher protocol versions (such as
1263         // an SSL 3.0 server that chose a TLS-only cipher suite).  Fall
1264         // back to the next lower version and retry.
1265         // NOTE: if the SSLClientSocket class doesn't support TLS 1.1,
1266         // specifying TLS 1.1 in version_max will result in a TLS 1.0
1267         // handshake, so falling back from TLS 1.1 to TLS 1.0 will simply
1268         // repeat the TLS 1.0 handshake. To avoid this problem, the default
1269         // version_max should match the maximum protocol version supported
1270         // by the SSLClientSocket class.
1271         version_max--;
1272
1273         // Fallback to the lower SSL version.
1274         // While SSL 3.0 fallback should be eliminated because of security
1275         // reasons, there is a high risk of breaking the servers if this is
1276         // done in general.
1277         should_fallback = true;
1278       }
1279       break;
1280     case ERR_CONNECTION_RESET:
1281       if (version_max >= SSL_PROTOCOL_VERSION_TLS1_1 &&
1282           version_max > server_ssl_config_.version_min) {
1283         // Some network devices that inspect application-layer packets seem to
1284         // inject TCP reset packets to break the connections when they see TLS
1285         // 1.1 in ClientHello or ServerHello. See http://crbug.com/130293.
1286         //
1287         // Only allow ERR_CONNECTION_RESET to trigger a fallback from TLS 1.1 or
1288         // 1.2. We don't lose much in this fallback because the explicit IV for
1289         // CBC mode in TLS 1.1 is approximated by record splitting in TLS
1290         // 1.0. The fallback will be more painful for TLS 1.2 when we have GCM
1291         // support.
1292         //
1293         // ERR_CONNECTION_RESET is a common network error, so we don't want it
1294         // to trigger a version fallback in general, especially the TLS 1.0 ->
1295         // SSL 3.0 fallback, which would drop TLS extensions.
1296         version_max--;
1297         should_fallback = true;
1298       }
1299       break;
1300     case ERR_SSL_BAD_RECORD_MAC_ALERT:
1301       if (version_max >= SSL_PROTOCOL_VERSION_TLS1_1 &&
1302           version_max > server_ssl_config_.version_min) {
1303         // Some broken SSL devices negotiate TLS 1.0 when sent a TLS 1.1 or
1304         // 1.2 ClientHello, but then return a bad_record_mac alert. See
1305         // crbug.com/260358. In order to make the fallback as minimal as
1306         // possible, this fallback is only triggered for >= TLS 1.1.
1307         version_max--;
1308         should_fallback = true;
1309       }
1310       break;
1311     case ERR_SSL_INAPPROPRIATE_FALLBACK:
1312       // The server told us that we should not have fallen back. A buggy server
1313       // could trigger ERR_SSL_INAPPROPRIATE_FALLBACK with the initial
1314       // connection. |fallback_error_code_| is initialised to
1315       // ERR_SSL_INAPPROPRIATE_FALLBACK to catch this case.
1316       error = fallback_error_code_;
1317       break;
1318   }
1319
1320   if (should_fallback) {
1321     net_log_.AddEvent(
1322         NetLog::TYPE_SSL_VERSION_FALLBACK,
1323         base::Bind(&NetLogSSLVersionFallbackCallback,
1324                    &request_->url, error, server_ssl_config_.version_max,
1325                    version_max));
1326     fallback_error_code_ = error;
1327     server_ssl_config_.version_max = version_max;
1328     server_ssl_config_.version_fallback = true;
1329     ResetConnectionAndRequestForResend();
1330     error = OK;
1331   }
1332
1333   return error;
1334 }
1335
1336 // This method determines whether it is safe to resend the request after an
1337 // IO error.  It can only be called in response to request header or body
1338 // write errors or response header read errors.  It should not be used in
1339 // other cases, such as a Connect error.
1340 int HttpNetworkTransaction::HandleIOError(int error) {
1341   // Because the peer may request renegotiation with client authentication at
1342   // any time, check and handle client authentication errors.
1343   HandleClientAuthError(error);
1344
1345   switch (error) {
1346     // If we try to reuse a connection that the server is in the process of
1347     // closing, we may end up successfully writing out our request (or a
1348     // portion of our request) only to find a connection error when we try to
1349     // read from (or finish writing to) the socket.
1350     case ERR_CONNECTION_RESET:
1351     case ERR_CONNECTION_CLOSED:
1352     case ERR_CONNECTION_ABORTED:
1353     // There can be a race between the socket pool checking checking whether a
1354     // socket is still connected, receiving the FIN, and sending/reading data
1355     // on a reused socket.  If we receive the FIN between the connectedness
1356     // check and writing/reading from the socket, we may first learn the socket
1357     // is disconnected when we get a ERR_SOCKET_NOT_CONNECTED.  This will most
1358     // likely happen when trying to retrieve its IP address.
1359     // See http://crbug.com/105824 for more details.
1360     case ERR_SOCKET_NOT_CONNECTED:
1361     // If a socket is closed on its initial request, HttpStreamParser returns
1362     // ERR_EMPTY_RESPONSE. This may still be close/reuse race if the socket was
1363     // preconnected but failed to be used before the server timed it out.
1364     case ERR_EMPTY_RESPONSE:
1365       if (ShouldResendRequest()) {
1366         net_log_.AddEventWithNetErrorCode(
1367             NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR, error);
1368         ResetConnectionAndRequestForResend();
1369         error = OK;
1370       }
1371       break;
1372     case ERR_SPDY_PING_FAILED:
1373     case ERR_SPDY_SERVER_REFUSED_STREAM:
1374     case ERR_QUIC_HANDSHAKE_FAILED:
1375       net_log_.AddEventWithNetErrorCode(
1376           NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR, error);
1377       ResetConnectionAndRequestForResend();
1378       error = OK;
1379       break;
1380   }
1381   return error;
1382 }
1383
1384 void HttpNetworkTransaction::ResetStateForRestart() {
1385   ResetStateForAuthRestart();
1386   if (stream_)
1387     total_received_bytes_ += stream_->GetTotalReceivedBytes();
1388   stream_.reset();
1389 }
1390
1391 void HttpNetworkTransaction::ResetStateForAuthRestart() {
1392   send_start_time_ = base::TimeTicks();
1393   send_end_time_ = base::TimeTicks();
1394
1395   pending_auth_target_ = HttpAuth::AUTH_NONE;
1396   read_buf_ = NULL;
1397   read_buf_len_ = 0;
1398   headers_valid_ = false;
1399   request_headers_.Clear();
1400   response_ = HttpResponseInfo();
1401   establishing_tunnel_ = false;
1402 }
1403
1404 HttpResponseHeaders* HttpNetworkTransaction::GetResponseHeaders() const {
1405   return response_.headers.get();
1406 }
1407
1408 bool HttpNetworkTransaction::ShouldResendRequest() const {
1409   bool connection_is_proven = stream_->IsConnectionReused();
1410   bool has_received_headers = GetResponseHeaders() != NULL;
1411
1412   // NOTE: we resend a request only if we reused a keep-alive connection.
1413   // This automatically prevents an infinite resend loop because we'll run
1414   // out of the cached keep-alive connections eventually.
1415   if (connection_is_proven && !has_received_headers)
1416     return true;
1417   return false;
1418 }
1419
1420 void HttpNetworkTransaction::ResetConnectionAndRequestForResend() {
1421   if (stream_.get()) {
1422     stream_->Close(true);
1423     stream_.reset();
1424   }
1425
1426   // We need to clear request_headers_ because it contains the real request
1427   // headers, but we may need to resend the CONNECT request first to recreate
1428   // the SSL tunnel.
1429   request_headers_.Clear();
1430   next_state_ = STATE_CREATE_STREAM;  // Resend the request.
1431 }
1432
1433 bool HttpNetworkTransaction::ShouldApplyProxyAuth() const {
1434   return UsingHttpProxyWithoutTunnel();
1435 }
1436
1437 bool HttpNetworkTransaction::ShouldApplyServerAuth() const {
1438   return !(request_->load_flags & LOAD_DO_NOT_SEND_AUTH_DATA);
1439 }
1440
1441 int HttpNetworkTransaction::HandleAuthChallenge() {
1442   scoped_refptr<HttpResponseHeaders> headers(GetResponseHeaders());
1443   DCHECK(headers.get());
1444
1445   int status = headers->response_code();
1446   if (status != HTTP_UNAUTHORIZED &&
1447       status != HTTP_PROXY_AUTHENTICATION_REQUIRED)
1448     return OK;
1449   HttpAuth::Target target = status == HTTP_PROXY_AUTHENTICATION_REQUIRED ?
1450                             HttpAuth::AUTH_PROXY : HttpAuth::AUTH_SERVER;
1451   if (target == HttpAuth::AUTH_PROXY && proxy_info_.is_direct())
1452     return ERR_UNEXPECTED_PROXY_AUTH;
1453
1454   // This case can trigger when an HTTPS server responds with a "Proxy
1455   // authentication required" status code through a non-authenticating
1456   // proxy.
1457   if (!auth_controllers_[target].get())
1458     return ERR_UNEXPECTED_PROXY_AUTH;
1459
1460   int rv = auth_controllers_[target]->HandleAuthChallenge(
1461       headers, (request_->load_flags & LOAD_DO_NOT_SEND_AUTH_DATA) != 0, false,
1462       net_log_);
1463   if (auth_controllers_[target]->HaveAuthHandler())
1464       pending_auth_target_ = target;
1465
1466   scoped_refptr<AuthChallengeInfo> auth_info =
1467       auth_controllers_[target]->auth_info();
1468   if (auth_info.get())
1469       response_.auth_challenge = auth_info;
1470
1471   return rv;
1472 }
1473
1474 bool HttpNetworkTransaction::HaveAuth(HttpAuth::Target target) const {
1475   return auth_controllers_[target].get() &&
1476       auth_controllers_[target]->HaveAuth();
1477 }
1478
1479 GURL HttpNetworkTransaction::AuthURL(HttpAuth::Target target) const {
1480   switch (target) {
1481     case HttpAuth::AUTH_PROXY: {
1482       if (!proxy_info_.proxy_server().is_valid() ||
1483           proxy_info_.proxy_server().is_direct()) {
1484         return GURL();  // There is no proxy server.
1485       }
1486       const char* scheme = proxy_info_.is_https() ? "https://" : "http://";
1487       return GURL(scheme +
1488                   proxy_info_.proxy_server().host_port_pair().ToString());
1489     }
1490     case HttpAuth::AUTH_SERVER:
1491       if (ForWebSocketHandshake()) {
1492         const GURL& url = request_->url;
1493         url::Replacements<char> ws_to_http;
1494         if (url.SchemeIs("ws")) {
1495           ws_to_http.SetScheme("http", url::Component(0, 4));
1496         } else {
1497           DCHECK(url.SchemeIs("wss"));
1498           ws_to_http.SetScheme("https", url::Component(0, 5));
1499         }
1500         return url.ReplaceComponents(ws_to_http);
1501       }
1502       return request_->url;
1503     default:
1504      return GURL();
1505   }
1506 }
1507
1508 bool HttpNetworkTransaction::ForWebSocketHandshake() const {
1509   return websocket_handshake_stream_base_create_helper_ &&
1510          request_->url.SchemeIsWSOrWSS();
1511 }
1512
1513 #define STATE_CASE(s) \
1514   case s: \
1515     description = base::StringPrintf("%s (0x%08X)", #s, s); \
1516     break
1517
1518 std::string HttpNetworkTransaction::DescribeState(State state) {
1519   std::string description;
1520   switch (state) {
1521     STATE_CASE(STATE_NOTIFY_BEFORE_CREATE_STREAM);
1522     STATE_CASE(STATE_CREATE_STREAM);
1523     STATE_CASE(STATE_CREATE_STREAM_COMPLETE);
1524     STATE_CASE(STATE_INIT_REQUEST_BODY);
1525     STATE_CASE(STATE_INIT_REQUEST_BODY_COMPLETE);
1526     STATE_CASE(STATE_BUILD_REQUEST);
1527     STATE_CASE(STATE_BUILD_REQUEST_COMPLETE);
1528     STATE_CASE(STATE_SEND_REQUEST);
1529     STATE_CASE(STATE_SEND_REQUEST_COMPLETE);
1530     STATE_CASE(STATE_READ_HEADERS);
1531     STATE_CASE(STATE_READ_HEADERS_COMPLETE);
1532     STATE_CASE(STATE_READ_BODY);
1533     STATE_CASE(STATE_READ_BODY_COMPLETE);
1534     STATE_CASE(STATE_DRAIN_BODY_FOR_AUTH_RESTART);
1535     STATE_CASE(STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE);
1536     STATE_CASE(STATE_NONE);
1537     default:
1538       description = base::StringPrintf("Unknown state 0x%08X (%u)", state,
1539                                        state);
1540       break;
1541   }
1542   return description;
1543 }
1544
1545 #undef STATE_CASE
1546
1547 }  // namespace net