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/profiler/scoped_tracker.h"
  19 #include "base/stl_util.h"
  20 #include "base/strings/string_number_conversions.h"
  21 #include "base/strings/string_util.h"
  22 #include "base/strings/stringprintf.h"
  23 #include "base/time/time.h"
  24 #include "base/values.h"
  25 #include "build/build_config.h"
  26 #include "net/base/auth.h"
  27 #include "net/base/host_port_pair.h"
  28 #include "net/base/io_buffer.h"
  29 #include "net/base/load_flags.h"
  30 #include "net/base/load_timing_info.h"
  31 #include "net/base/net_errors.h"
  32 #include "net/base/net_util.h"
  33 #include "net/base/upload_data_stream.h"
  34 #include "net/http/http_auth.h"
  35 #include "net/http/http_auth_handler.h"
  36 #include "net/http/http_auth_handler_factory.h"
  37 #include "net/http/http_basic_stream.h"
  38 #include "net/http/http_chunked_decoder.h"
  39 #include "net/http/http_network_session.h"
  40 #include "net/http/http_proxy_client_socket.h"
  41 #include "net/http/http_proxy_client_socket_pool.h"
  42 #include "net/http/http_request_headers.h"
  43 #include "net/http/http_request_info.h"
  44 #include "net/http/http_response_headers.h"
  45 #include "net/http/http_response_info.h"
  46 #include "net/http/http_server_properties.h"
  47 #include "net/http/http_status_code.h"
  48 #include "net/http/http_stream.h"
  49 #include "net/http/http_stream_factory.h"
  50 #include "net/http/http_util.h"
  51 #include "net/http/transport_security_state.h"
  52 #include "net/http/url_security_manager.h"
  53 #include "net/socket/client_socket_factory.h"
  54 #include "net/socket/socks_client_socket_pool.h"
  55 #include "net/socket/ssl_client_socket.h"
  56 #include "net/socket/ssl_client_socket_pool.h"
  57 #include "net/socket/transport_client_socket_pool.h"
  58 #include "net/spdy/hpack_huffman_aggregator.h"
  59 #include "net/spdy/spdy_http_stream.h"
  60 #include "net/spdy/spdy_session.h"
  61 #include "net/spdy/spdy_session_pool.h"
  62 #include "net/ssl/ssl_cert_request_info.h"
  63 #include "net/ssl/ssl_connection_status_flags.h"
  64 #include "url/gurl.h"
  65 #include "url/url_canon.h"
  66
  67 namespace net {
  68
  69 namespace {
  70
  71 void ProcessAlternateProtocol(
  72     HttpNetworkSession* session,
  73     const HttpResponseHeaders& headers,
  74     const HostPortPair& http_host_port_pair) {
  75   if (!headers.HasHeader(kAlternateProtocolHeader))
  76     return;
  77
  78   std::vector<std::string> alternate_protocol_values;
  79   void* iter = NULL;
  80   std::string alternate_protocol_str;
  81   while (headers.EnumerateHeader(&iter, kAlternateProtocolHeader,
  82                                  &alternate_protocol_str)) {
  83     alternate_protocol_values.push_back(alternate_protocol_str);
  84   }
  85
  86   session->http_stream_factory()->ProcessAlternateProtocol(
  87       session->http_server_properties(),
  88       alternate_protocol_values,
  89       http_host_port_pair,
  90       *session);
  91 }
  92
  93 base::Value* NetLogSSLVersionFallbackCallback(
  94     const GURL* url,
  95     int net_error,
  96     uint16 version_before,
  97     uint16 version_after,
  98     NetLog::LogLevel /* log_level */) {
  99   base::DictionaryValue* dict = new base::DictionaryValue();
 100   dict->SetString("host_and_port", GetHostAndPort(*url));
 101   dict->SetInteger("net_error", net_error);
 102   dict->SetInteger("version_before", version_before);
 103   dict->SetInteger("version_after", version_after);
 104   return dict;
 105 }
 106
 107 }  // namespace
 108
 109 //-----------------------------------------------------------------------------
 110
 111 HttpNetworkTransaction::HttpNetworkTransaction(RequestPriority priority,
 112                                                HttpNetworkSession* session)
 113     : pending_auth_target_(HttpAuth::AUTH_NONE),
 114       io_callback_(base::Bind(&HttpNetworkTransaction::OnIOComplete,
 115                               base::Unretained(this))),
 116       session_(session),
 117       request_(NULL),
 118       priority_(priority),
 119       headers_valid_(false),
 120       fallback_error_code_(ERR_SSL_INAPPROPRIATE_FALLBACK),
 121       request_headers_(),
 122       read_buf_len_(0),
 123       total_received_bytes_(0),
 124       next_state_(STATE_NONE),
 125       establishing_tunnel_(false),
 126       websocket_handshake_stream_base_create_helper_(NULL) {
 127   session->ssl_config_service()->GetSSLConfig(&server_ssl_config_);
 128   session->GetNextProtos(&server_ssl_config_.next_protos);
 129   proxy_ssl_config_ = server_ssl_config_;
 130 }
 131
 132 HttpNetworkTransaction::~HttpNetworkTransaction() {
 133   if (stream_.get()) {
 134     HttpResponseHeaders* headers = GetResponseHeaders();
 135     // TODO(mbelshe): The stream_ should be able to compute whether or not the
 136     //                stream should be kept alive.  No reason to compute here
 137     //                and pass it in.
 138     bool try_to_keep_alive =
 139         next_state_ == STATE_NONE &&
 140         stream_->CanFindEndOfResponse() &&
 141         (!headers || headers->IsKeepAlive());
 142     if (!try_to_keep_alive) {
 143       stream_->Close(true /* not reusable */);
 144     } else {
 145       if (stream_->IsResponseBodyComplete()) {
 146         // If the response body is complete, we can just reuse the socket.
 147         stream_->Close(false /* reusable */);
 148       } else if (stream_->IsSpdyHttpStream()) {
 149         // Doesn't really matter for SpdyHttpStream. Just close it.
 150         stream_->Close(true /* not reusable */);
 151       } else {
 152         // Otherwise, we try to drain the response body.
 153         HttpStream* stream = stream_.release();
 154         stream->Drain(session_);
 155       }
 156     }
 157   }
 158
 159   if (request_ && request_->upload_data_stream)
 160     request_->upload_data_stream->Reset();  // Invalidate pending callbacks.
 161 }
 162
 163 int HttpNetworkTransaction::Start(const HttpRequestInfo* request_info,
 164                                   const CompletionCallback& callback,
 165                                   const BoundNetLog& net_log) {
 166   SIMPLE_STATS_COUNTER("HttpNetworkTransaction.Count");
 167
 168   net_log_ = net_log;
 169   request_ = request_info;
 170
 171   if (request_->load_flags & LOAD_DISABLE_CERT_REVOCATION_CHECKING) {
 172     server_ssl_config_.rev_checking_enabled = false;
 173     proxy_ssl_config_.rev_checking_enabled = false;
 174   }
 175
 176   // Channel ID is disabled if privacy mode is enabled for this request.
 177   if (request_->privacy_mode == PRIVACY_MODE_ENABLED)
 178     server_ssl_config_.channel_id_enabled = false;
 179
 180   next_state_ = STATE_NOTIFY_BEFORE_CREATE_STREAM;
 181   int rv = DoLoop(OK);
 182   if (rv == ERR_IO_PENDING)
 183     callback_ = callback;
 184   return rv;
 185 }
 186
 187 int HttpNetworkTransaction::RestartIgnoringLastError(
 188     const CompletionCallback& callback) {
 189   DCHECK(!stream_.get());
 190   DCHECK(!stream_request_.get());
 191   DCHECK_EQ(STATE_NONE, next_state_);
 192
 193   next_state_ = STATE_CREATE_STREAM;
 194
 195   int rv = DoLoop(OK);
 196   if (rv == ERR_IO_PENDING)
 197     callback_ = callback;
 198   return rv;
 199 }
 200
 201 int HttpNetworkTransaction::RestartWithCertificate(
 202     X509Certificate* client_cert, const CompletionCallback& callback) {
 203   // In HandleCertificateRequest(), we always tear down existing stream
 204   // requests to force a new connection.  So we shouldn't have one here.
 205   DCHECK(!stream_request_.get());
 206   DCHECK(!stream_.get());
 207   DCHECK_EQ(STATE_NONE, next_state_);
 208
 209   SSLConfig* ssl_config = response_.cert_request_info->is_proxy ?
 210       &proxy_ssl_config_ : &server_ssl_config_;
 211   ssl_config->send_client_cert = true;
 212   ssl_config->client_cert = client_cert;
 213   session_->ssl_client_auth_cache()->Add(
 214       response_.cert_request_info->host_and_port, client_cert);
 215   // Reset the other member variables.
 216   // Note: this is necessary only with SSL renegotiation.
 217   ResetStateForRestart();
 218   next_state_ = STATE_CREATE_STREAM;
 219   int rv = DoLoop(OK);
 220   if (rv == ERR_IO_PENDING)
 221     callback_ = callback;
 222   return rv;
 223 }
 224
 225 int HttpNetworkTransaction::RestartWithAuth(
 226     const AuthCredentials& credentials, const CompletionCallback& callback) {
 227   HttpAuth::Target target = pending_auth_target_;
 228   if (target == HttpAuth::AUTH_NONE) {
 229     NOTREACHED();
 230     return ERR_UNEXPECTED;
 231   }
 232   pending_auth_target_ = HttpAuth::AUTH_NONE;
 233
 234   auth_controllers_[target]->ResetAuth(credentials);
 235
 236   DCHECK(callback_.is_null());
 237
 238   int rv = OK;
 239   if (target == HttpAuth::AUTH_PROXY && establishing_tunnel_) {
 240     // In this case, we've gathered credentials for use with proxy
 241     // authentication of a tunnel.
 242     DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 243     DCHECK(stream_request_ != NULL);
 244     auth_controllers_[target] = NULL;
 245     ResetStateForRestart();
 246     rv = stream_request_->RestartTunnelWithProxyAuth(credentials);
 247   } else {
 248     // In this case, we've gathered credentials for the server or the proxy
 249     // but it is not during the tunneling phase.
 250     DCHECK(stream_request_ == NULL);
 251     PrepareForAuthRestart(target);
 252     rv = DoLoop(OK);
 253   }
 254
 255   if (rv == ERR_IO_PENDING)
 256     callback_ = callback;
 257   return rv;
 258 }
 259
 260 void HttpNetworkTransaction::PrepareForAuthRestart(HttpAuth::Target target) {
 261   DCHECK(HaveAuth(target));
 262   DCHECK(!stream_request_.get());
 263
 264   bool keep_alive = false;
 265   // Even if the server says the connection is keep-alive, we have to be
 266   // able to find the end of each response in order to reuse the connection.
 267   if (GetResponseHeaders()->IsKeepAlive() &&
 268       stream_->CanFindEndOfResponse()) {
 269     // If the response body hasn't been completely read, we need to drain
 270     // it first.
 271     if (!stream_->IsResponseBodyComplete()) {
 272       next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
 273       read_buf_ = new IOBuffer(kDrainBodyBufferSize);  // A bit bucket.
 274       read_buf_len_ = kDrainBodyBufferSize;
 275       return;
 276     }
 277     keep_alive = true;
 278   }
 279
 280   // We don't need to drain the response body, so we act as if we had drained
 281   // the response body.
 282   DidDrainBodyForAuthRestart(keep_alive);
 283 }
 284
 285 void HttpNetworkTransaction::DidDrainBodyForAuthRestart(bool keep_alive) {
 286   DCHECK(!stream_request_.get());
 287
 288   if (stream_.get()) {
 289     total_received_bytes_ += stream_->GetTotalReceivedBytes();
 290     HttpStream* new_stream = NULL;
 291     if (keep_alive && stream_->IsConnectionReusable()) {
 292       // We should call connection_->set_idle_time(), but this doesn't occur
 293       // often enough to be worth the trouble.
 294       stream_->SetConnectionReused();
 295       new_stream = stream_->RenewStreamForAuth();
 296     }
 297
 298     if (!new_stream) {
 299       // Close the stream and mark it as not_reusable.  Even in the
 300       // keep_alive case, we've determined that the stream_ is not
 301       // reusable if new_stream is NULL.
 302       stream_->Close(true);
 303       next_state_ = STATE_CREATE_STREAM;
 304     } else {
 305       // Renewed streams shouldn't carry over received bytes.
 306       DCHECK_EQ(0, new_stream->GetTotalReceivedBytes());
 307       next_state_ = STATE_INIT_STREAM;
 308     }
 309     stream_.reset(new_stream);
 310   }
 311
 312   // Reset the other member variables.
 313   ResetStateForAuthRestart();
 314 }
 315
 316 bool HttpNetworkTransaction::IsReadyToRestartForAuth() {
 317   return pending_auth_target_ != HttpAuth::AUTH_NONE &&
 318       HaveAuth(pending_auth_target_);
 319 }
 320
 321 int HttpNetworkTransaction::Read(IOBuffer* buf, int buf_len,
 322                                  const CompletionCallback& callback) {
 323   DCHECK(buf);
 324   DCHECK_LT(0, buf_len);
 325
 326   State next_state = STATE_NONE;
 327
 328   scoped_refptr<HttpResponseHeaders> headers(GetResponseHeaders());
 329   if (headers_valid_ && headers.get() && stream_request_.get()) {
 330     // We're trying to read the body of the response but we're still trying
 331     // to establish an SSL tunnel through an HTTP proxy.  We can't read these
 332     // bytes when establishing a tunnel because they might be controlled by
 333     // an active network attacker.  We don't worry about this for HTTP
 334     // because an active network attacker can already control HTTP sessions.
 335     // We reach this case when the user cancels a 407 proxy auth prompt.  We
 336     // also don't worry about this for an HTTPS Proxy, because the
 337     // communication with the proxy is secure.
 338     // See http://crbug.com/8473.
 339     DCHECK(proxy_info_.is_http() || proxy_info_.is_https());
 340     DCHECK_EQ(headers->response_code(), HTTP_PROXY_AUTHENTICATION_REQUIRED);
 341     LOG(WARNING) << "Blocked proxy response with status "
 342                  << headers->response_code() << " to CONNECT request for "
 343                  << GetHostAndPort(request_->url) << ".";
 344     return ERR_TUNNEL_CONNECTION_FAILED;
 345   }
 346
 347   // Are we using SPDY or HTTP?
 348   next_state = STATE_READ_BODY;
 349
 350   read_buf_ = buf;
 351   read_buf_len_ = buf_len;
 352
 353   next_state_ = next_state;
 354   int rv = DoLoop(OK);
 355   if (rv == ERR_IO_PENDING)
 356     callback_ = callback;
 357   return rv;
 358 }
 359
 360 void HttpNetworkTransaction::StopCaching() {}
 361
 362 bool HttpNetworkTransaction::GetFullRequestHeaders(
 363     HttpRequestHeaders* headers) const {
 364   // TODO(ttuttle): Make sure we've populated request_headers_.
 365   *headers = request_headers_;
 366   return true;
 367 }
 368
 369 int64 HttpNetworkTransaction::GetTotalReceivedBytes() const {
 370   int64 total_received_bytes = total_received_bytes_;
 371   if (stream_)
 372     total_received_bytes += stream_->GetTotalReceivedBytes();
 373   return total_received_bytes;
 374 }
 375
 376 void HttpNetworkTransaction::DoneReading() {}
 377
 378 const HttpResponseInfo* HttpNetworkTransaction::GetResponseInfo() const {
 379   return ((headers_valid_ && response_.headers.get()) ||
 380           response_.ssl_info.cert.get() || response_.cert_request_info.get())
 381              ? &response_
 382              : NULL;
 383 }
 384
 385 LoadState HttpNetworkTransaction::GetLoadState() const {
 386   // TODO(wtc): Define a new LoadState value for the
 387   // STATE_INIT_CONNECTION_COMPLETE state, which delays the HTTP request.
 388   switch (next_state_) {
 389     case STATE_CREATE_STREAM:
 390       return LOAD_STATE_WAITING_FOR_DELEGATE;
 391     case STATE_CREATE_STREAM_COMPLETE:
 392       return stream_request_->GetLoadState();
 393     case STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE:
 394     case STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE:
 395     case STATE_SEND_REQUEST_COMPLETE:
 396       return LOAD_STATE_SENDING_REQUEST;
 397     case STATE_READ_HEADERS_COMPLETE:
 398       return LOAD_STATE_WAITING_FOR_RESPONSE;
 399     case STATE_READ_BODY_COMPLETE:
 400       return LOAD_STATE_READING_RESPONSE;
 401     default:
 402       return LOAD_STATE_IDLE;
 403   }
 404 }
 405
 406 UploadProgress HttpNetworkTransaction::GetUploadProgress() const {
 407   if (!stream_.get())
 408     return UploadProgress();
 409
 410   return stream_->GetUploadProgress();
 411 }
 412
 413 void HttpNetworkTransaction::SetQuicServerInfo(
 414     QuicServerInfo* quic_server_info) {}
 415
 416 bool HttpNetworkTransaction::GetLoadTimingInfo(
 417     LoadTimingInfo* load_timing_info) const {
 418   if (!stream_ || !stream_->GetLoadTimingInfo(load_timing_info))
 419     return false;
 420
 421   load_timing_info->proxy_resolve_start =
 422       proxy_info_.proxy_resolve_start_time();
 423   load_timing_info->proxy_resolve_end = proxy_info_.proxy_resolve_end_time();
 424   load_timing_info->send_start = send_start_time_;
 425   load_timing_info->send_end = send_end_time_;
 426   return true;
 427 }
 428
 429 void HttpNetworkTransaction::SetPriority(RequestPriority priority) {
 430   priority_ = priority;
 431   if (stream_request_)
 432     stream_request_->SetPriority(priority);
 433   if (stream_)
 434     stream_->SetPriority(priority);
 435 }
 436
 437 void HttpNetworkTransaction::SetWebSocketHandshakeStreamCreateHelper(
 438     WebSocketHandshakeStreamBase::CreateHelper* create_helper) {
 439   websocket_handshake_stream_base_create_helper_ = create_helper;
 440 }
 441
 442 void HttpNetworkTransaction::SetBeforeNetworkStartCallback(
 443     const BeforeNetworkStartCallback& callback) {
 444   before_network_start_callback_ = callback;
 445 }
 446
 447 void HttpNetworkTransaction::SetBeforeProxyHeadersSentCallback(
 448     const BeforeProxyHeadersSentCallback& callback) {
 449   before_proxy_headers_sent_callback_ = callback;
 450 }
 451
 452 int HttpNetworkTransaction::ResumeNetworkStart() {
 453   DCHECK_EQ(next_state_, STATE_CREATE_STREAM);
 454   return DoLoop(OK);
 455 }
 456
 457 void HttpNetworkTransaction::OnStreamReady(const SSLConfig& used_ssl_config,
 458                                            const ProxyInfo& used_proxy_info,
 459                                            HttpStream* stream) {
 460   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 461   DCHECK(stream_request_.get());
 462
 463   if (stream_)
 464     total_received_bytes_ += stream_->GetTotalReceivedBytes();
 465   stream_.reset(stream);
 466   server_ssl_config_ = used_ssl_config;
 467   proxy_info_ = used_proxy_info;
 468   response_.was_npn_negotiated = stream_request_->was_npn_negotiated();
 469   response_.npn_negotiated_protocol = SSLClientSocket::NextProtoToString(
 470       stream_request_->protocol_negotiated());
 471   response_.was_fetched_via_spdy = stream_request_->using_spdy();
 472   response_.was_fetched_via_proxy = !proxy_info_.is_direct();
 473   if (response_.was_fetched_via_proxy && !proxy_info_.is_empty())
 474     response_.proxy_server = proxy_info_.proxy_server().host_port_pair();
 475   OnIOComplete(OK);
 476 }
 477
 478 void HttpNetworkTransaction::OnWebSocketHandshakeStreamReady(
 479     const SSLConfig& used_ssl_config,
 480     const ProxyInfo& used_proxy_info,
 481     WebSocketHandshakeStreamBase* stream) {
 482   OnStreamReady(used_ssl_config, used_proxy_info, stream);
 483 }
 484
 485 void HttpNetworkTransaction::OnStreamFailed(int result,
 486                                             const SSLConfig& used_ssl_config) {
 487   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 488   DCHECK_NE(OK, result);
 489   DCHECK(stream_request_.get());
 490   DCHECK(!stream_.get());
 491   server_ssl_config_ = used_ssl_config;
 492
 493   OnIOComplete(result);
 494 }
 495
 496 void HttpNetworkTransaction::OnCertificateError(
 497     int result,
 498     const SSLConfig& used_ssl_config,
 499     const SSLInfo& ssl_info) {
 500   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 501   DCHECK_NE(OK, result);
 502   DCHECK(stream_request_.get());
 503   DCHECK(!stream_.get());
 504
 505   response_.ssl_info = ssl_info;
 506   server_ssl_config_ = used_ssl_config;
 507
 508   // TODO(mbelshe):  For now, we're going to pass the error through, and that
 509   // will close the stream_request in all cases.  This means that we're always
 510   // going to restart an entire STATE_CREATE_STREAM, even if the connection is
 511   // good and the user chooses to ignore the error.  This is not ideal, but not
 512   // the end of the world either.
 513
 514   OnIOComplete(result);
 515 }
 516
 517 void HttpNetworkTransaction::OnNeedsProxyAuth(
 518     const HttpResponseInfo& proxy_response,
 519     const SSLConfig& used_ssl_config,
 520     const ProxyInfo& used_proxy_info,
 521     HttpAuthController* auth_controller) {
 522   DCHECK(stream_request_.get());
 523   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 524
 525   establishing_tunnel_ = true;
 526   response_.headers = proxy_response.headers;
 527   response_.auth_challenge = proxy_response.auth_challenge;
 528   headers_valid_ = true;
 529   server_ssl_config_ = used_ssl_config;
 530   proxy_info_ = used_proxy_info;
 531
 532   auth_controllers_[HttpAuth::AUTH_PROXY] = auth_controller;
 533   pending_auth_target_ = HttpAuth::AUTH_PROXY;
 534
 535   DoCallback(OK);
 536 }
 537
 538 void HttpNetworkTransaction::OnNeedsClientAuth(
 539     const SSLConfig& used_ssl_config,
 540     SSLCertRequestInfo* cert_info) {
 541   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 542
 543   server_ssl_config_ = used_ssl_config;
 544   response_.cert_request_info = cert_info;
 545   OnIOComplete(ERR_SSL_CLIENT_AUTH_CERT_NEEDED);
 546 }
 547
 548 void HttpNetworkTransaction::OnHttpsProxyTunnelResponse(
 549     const HttpResponseInfo& response_info,
 550     const SSLConfig& used_ssl_config,
 551     const ProxyInfo& used_proxy_info,
 552     HttpStream* stream) {
 553   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 554
 555   headers_valid_ = true;
 556   response_ = response_info;
 557   server_ssl_config_ = used_ssl_config;
 558   proxy_info_ = used_proxy_info;
 559   if (stream_)
 560     total_received_bytes_ += stream_->GetTotalReceivedBytes();
 561   stream_.reset(stream);
 562   stream_request_.reset();  // we're done with the stream request
 563   OnIOComplete(ERR_HTTPS_PROXY_TUNNEL_RESPONSE);
 564 }
 565
 566 bool HttpNetworkTransaction::is_https_request() const {
 567   return request_->url.SchemeIs("https");
 568 }
 569
 570 void HttpNetworkTransaction::DoCallback(int rv) {
 571   DCHECK_NE(rv, ERR_IO_PENDING);
 572   DCHECK(!callback_.is_null());
 573
 574   // Since Run may result in Read being called, clear user_callback_ up front.
 575   CompletionCallback c = callback_;
 576   callback_.Reset();
 577   c.Run(rv);
 578 }
 579
 580 void HttpNetworkTransaction::OnIOComplete(int result) {
 581   // TODO(vadimt): Remove ScopedTracker below once crbug.com/424359 is fixed.
 582   tracked_objects::ScopedTracker tracking_profile1(
 583       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 584           "424359 HttpNetworkTransaction::OnIOComplete 1"));
 585
 586   int rv = DoLoop(result);
 587
 588   // TODO(vadimt): Remove ScopedTracker below once crbug.com/424359 is fixed.
 589   tracked_objects::ScopedTracker tracking_profile2(
 590       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 591           "424359 HttpNetworkTransaction::OnIOComplete 2"));
 592
 593   if (rv != ERR_IO_PENDING)
 594     DoCallback(rv);
 595 }
 596
 597 int HttpNetworkTransaction::DoLoop(int result) {
 598   DCHECK(next_state_ != STATE_NONE);
 599
 600   int rv = result;
 601   do {
 602     State state = next_state_;
 603     next_state_ = STATE_NONE;
 604     switch (state) {
 605       case STATE_NOTIFY_BEFORE_CREATE_STREAM:
 606         DCHECK_EQ(OK, rv);
 607         rv = DoNotifyBeforeCreateStream();
 608         break;
 609       case STATE_CREATE_STREAM:
 610         DCHECK_EQ(OK, rv);
 611         rv = DoCreateStream();
 612         break;
 613       case STATE_CREATE_STREAM_COMPLETE:
 614         rv = DoCreateStreamComplete(rv);
 615         break;
 616       case STATE_INIT_STREAM:
 617         DCHECK_EQ(OK, rv);
 618         rv = DoInitStream();
 619         break;
 620       case STATE_INIT_STREAM_COMPLETE:
 621         rv = DoInitStreamComplete(rv);
 622         break;
 623       case STATE_GENERATE_PROXY_AUTH_TOKEN:
 624         DCHECK_EQ(OK, rv);
 625         rv = DoGenerateProxyAuthToken();
 626         break;
 627       case STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE:
 628         rv = DoGenerateProxyAuthTokenComplete(rv);
 629         break;
 630       case STATE_GENERATE_SERVER_AUTH_TOKEN:
 631         DCHECK_EQ(OK, rv);
 632         rv = DoGenerateServerAuthToken();
 633         break;
 634       case STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE:
 635         rv = DoGenerateServerAuthTokenComplete(rv);
 636         break;
 637       case STATE_INIT_REQUEST_BODY:
 638         DCHECK_EQ(OK, rv);
 639         rv = DoInitRequestBody();
 640         break;
 641       case STATE_INIT_REQUEST_BODY_COMPLETE:
 642         rv = DoInitRequestBodyComplete(rv);
 643         break;
 644       case STATE_BUILD_REQUEST:
 645         DCHECK_EQ(OK, rv);
 646         net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_SEND_REQUEST);
 647         rv = DoBuildRequest();
 648         break;
 649       case STATE_BUILD_REQUEST_COMPLETE:
 650         rv = DoBuildRequestComplete(rv);
 651         break;
 652       case STATE_SEND_REQUEST:
 653         DCHECK_EQ(OK, rv);
 654         rv = DoSendRequest();
 655         break;
 656       case STATE_SEND_REQUEST_COMPLETE:
 657         rv = DoSendRequestComplete(rv);
 658         net_log_.EndEventWithNetErrorCode(
 659             NetLog::TYPE_HTTP_TRANSACTION_SEND_REQUEST, rv);
 660         break;
 661       case STATE_READ_HEADERS:
 662         DCHECK_EQ(OK, rv);
 663         net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_READ_HEADERS);
 664         rv = DoReadHeaders();
 665         break;
 666       case STATE_READ_HEADERS_COMPLETE:
 667         rv = DoReadHeadersComplete(rv);
 668         net_log_.EndEventWithNetErrorCode(
 669             NetLog::TYPE_HTTP_TRANSACTION_READ_HEADERS, rv);
 670         break;
 671       case STATE_READ_BODY:
 672         DCHECK_EQ(OK, rv);
 673         net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_READ_BODY);
 674         rv = DoReadBody();
 675         break;
 676       case STATE_READ_BODY_COMPLETE:
 677         rv = DoReadBodyComplete(rv);
 678         net_log_.EndEventWithNetErrorCode(
 679             NetLog::TYPE_HTTP_TRANSACTION_READ_BODY, rv);
 680         break;
 681       case STATE_DRAIN_BODY_FOR_AUTH_RESTART:
 682         DCHECK_EQ(OK, rv);
 683         net_log_.BeginEvent(
 684             NetLog::TYPE_HTTP_TRANSACTION_DRAIN_BODY_FOR_AUTH_RESTART);
 685         rv = DoDrainBodyForAuthRestart();
 686         break;
 687       case STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE:
 688         rv = DoDrainBodyForAuthRestartComplete(rv);
 689         net_log_.EndEventWithNetErrorCode(
 690             NetLog::TYPE_HTTP_TRANSACTION_DRAIN_BODY_FOR_AUTH_RESTART, rv);
 691         break;
 692       default:
 693         NOTREACHED() << "bad state";
 694         rv = ERR_FAILED;
 695         break;
 696     }
 697   } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
 698
 699   return rv;
 700 }
 701
 702 int HttpNetworkTransaction::DoNotifyBeforeCreateStream() {
 703   next_state_ = STATE_CREATE_STREAM;
 704   bool defer = false;
 705   if (!before_network_start_callback_.is_null())
 706     before_network_start_callback_.Run(&defer);
 707   if (!defer)
 708     return OK;
 709   return ERR_IO_PENDING;
 710 }
 711
 712 int HttpNetworkTransaction::DoCreateStream() {
 713   next_state_ = STATE_CREATE_STREAM_COMPLETE;
 714   if (ForWebSocketHandshake()) {
 715     stream_request_.reset(
 716         session_->http_stream_factory_for_websocket()
 717             ->RequestWebSocketHandshakeStream(
 718                   *request_,
 719                   priority_,
 720                   server_ssl_config_,
 721                   proxy_ssl_config_,
 722                   this,
 723                   websocket_handshake_stream_base_create_helper_,
 724                   net_log_));
 725   } else {
 726     stream_request_.reset(
 727         session_->http_stream_factory()->RequestStream(
 728             *request_,
 729             priority_,
 730             server_ssl_config_,
 731             proxy_ssl_config_,
 732             this,
 733             net_log_));
 734   }
 735   DCHECK(stream_request_.get());
 736   return ERR_IO_PENDING;
 737 }
 738
 739 int HttpNetworkTransaction::DoCreateStreamComplete(int result) {
 740   if (result == OK) {
 741     next_state_ = STATE_INIT_STREAM;
 742     DCHECK(stream_.get());
 743   } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
 744     result = HandleCertificateRequest(result);
 745   } else if (result == ERR_HTTPS_PROXY_TUNNEL_RESPONSE) {
 746     // Return OK and let the caller read the proxy's error page
 747     next_state_ = STATE_NONE;
 748     return OK;
 749   }
 750
 751   // Handle possible handshake errors that may have occurred if the stream
 752   // used SSL for one or more of the layers.
 753   result = HandleSSLHandshakeError(result);
 754
 755   // At this point we are done with the stream_request_.
 756   stream_request_.reset();
 757   return result;
 758 }
 759
 760 int HttpNetworkTransaction::DoInitStream() {
 761   DCHECK(stream_.get());
 762   next_state_ = STATE_INIT_STREAM_COMPLETE;
 763   return stream_->InitializeStream(request_, priority_, net_log_, io_callback_);
 764 }
 765
 766 int HttpNetworkTransaction::DoInitStreamComplete(int result) {
 767   if (result == OK) {
 768     next_state_ = STATE_GENERATE_PROXY_AUTH_TOKEN;
 769   } else {
 770     if (result < 0)
 771       result = HandleIOError(result);
 772
 773     // The stream initialization failed, so this stream will never be useful.
 774     if (stream_)
 775         total_received_bytes_ += stream_->GetTotalReceivedBytes();
 776     stream_.reset();
 777   }
 778
 779   return result;
 780 }
 781
 782 int HttpNetworkTransaction::DoGenerateProxyAuthToken() {
 783   next_state_ = STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE;
 784   if (!ShouldApplyProxyAuth())
 785     return OK;
 786   HttpAuth::Target target = HttpAuth::AUTH_PROXY;
 787   if (!auth_controllers_[target].get())
 788     auth_controllers_[target] =
 789         new HttpAuthController(target,
 790                                AuthURL(target),
 791                                session_->http_auth_cache(),
 792                                session_->http_auth_handler_factory());
 793   return auth_controllers_[target]->MaybeGenerateAuthToken(request_,
 794                                                            io_callback_,
 795                                                            net_log_);
 796 }
 797
 798 int HttpNetworkTransaction::DoGenerateProxyAuthTokenComplete(int rv) {
 799   DCHECK_NE(ERR_IO_PENDING, rv);
 800   if (rv == OK)
 801     next_state_ = STATE_GENERATE_SERVER_AUTH_TOKEN;
 802   return rv;
 803 }
 804
 805 int HttpNetworkTransaction::DoGenerateServerAuthToken() {
 806   next_state_ = STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE;
 807   HttpAuth::Target target = HttpAuth::AUTH_SERVER;
 808   if (!auth_controllers_[target].get()) {
 809     auth_controllers_[target] =
 810         new HttpAuthController(target,
 811                                AuthURL(target),
 812                                session_->http_auth_cache(),
 813                                session_->http_auth_handler_factory());
 814     if (request_->load_flags & LOAD_DO_NOT_USE_EMBEDDED_IDENTITY)
 815       auth_controllers_[target]->DisableEmbeddedIdentity();
 816   }
 817   if (!ShouldApplyServerAuth())
 818     return OK;
 819   return auth_controllers_[target]->MaybeGenerateAuthToken(request_,
 820                                                            io_callback_,
 821                                                            net_log_);
 822 }
 823
 824 int HttpNetworkTransaction::DoGenerateServerAuthTokenComplete(int rv) {
 825   DCHECK_NE(ERR_IO_PENDING, rv);
 826   if (rv == OK)
 827     next_state_ = STATE_INIT_REQUEST_BODY;
 828   return rv;
 829 }
 830
 831 void HttpNetworkTransaction::BuildRequestHeaders(bool using_proxy) {
 832   request_headers_.SetHeader(HttpRequestHeaders::kHost,
 833                              GetHostAndOptionalPort(request_->url));
 834
 835   // For compat with HTTP/1.0 servers and proxies:
 836   if (using_proxy) {
 837     request_headers_.SetHeader(HttpRequestHeaders::kProxyConnection,
 838                                "keep-alive");
 839   } else {
 840     request_headers_.SetHeader(HttpRequestHeaders::kConnection, "keep-alive");
 841   }
 842
 843   // Add a content length header?
 844   if (request_->upload_data_stream) {
 845     if (request_->upload_data_stream->is_chunked()) {
 846       request_headers_.SetHeader(
 847           HttpRequestHeaders::kTransferEncoding, "chunked");
 848     } else {
 849       request_headers_.SetHeader(
 850           HttpRequestHeaders::kContentLength,
 851           base::Uint64ToString(request_->upload_data_stream->size()));
 852     }
 853   } else if (request_->method == "POST" || request_->method == "PUT" ||
 854              request_->method == "HEAD") {
 855     // An empty POST/PUT request still needs a content length.  As for HEAD,
 856     // IE and Safari also add a content length header.  Presumably it is to
 857     // support sending a HEAD request to an URL that only expects to be sent a
 858     // POST or some other method that normally would have a message body.
 859     request_headers_.SetHeader(HttpRequestHeaders::kContentLength, "0");
 860   }
 861
 862   // Honor load flags that impact proxy caches.
 863   if (request_->load_flags & LOAD_BYPASS_CACHE) {
 864     request_headers_.SetHeader(HttpRequestHeaders::kPragma, "no-cache");
 865     request_headers_.SetHeader(HttpRequestHeaders::kCacheControl, "no-cache");
 866   } else if (request_->load_flags & LOAD_VALIDATE_CACHE) {
 867     request_headers_.SetHeader(HttpRequestHeaders::kCacheControl, "max-age=0");
 868   }
 869
 870   if (ShouldApplyProxyAuth() && HaveAuth(HttpAuth::AUTH_PROXY))
 871     auth_controllers_[HttpAuth::AUTH_PROXY]->AddAuthorizationHeader(
 872         &request_headers_);
 873   if (ShouldApplyServerAuth() && HaveAuth(HttpAuth::AUTH_SERVER))
 874     auth_controllers_[HttpAuth::AUTH_SERVER]->AddAuthorizationHeader(
 875         &request_headers_);
 876
 877   request_headers_.MergeFrom(request_->extra_headers);
 878
 879   if (using_proxy && !before_proxy_headers_sent_callback_.is_null())
 880     before_proxy_headers_sent_callback_.Run(proxy_info_, &request_headers_);
 881
 882   response_.did_use_http_auth =
 883       request_headers_.HasHeader(HttpRequestHeaders::kAuthorization) ||
 884       request_headers_.HasHeader(HttpRequestHeaders::kProxyAuthorization);
 885 }
 886
 887 int HttpNetworkTransaction::DoInitRequestBody() {
 888   next_state_ = STATE_INIT_REQUEST_BODY_COMPLETE;
 889   int rv = OK;
 890   if (request_->upload_data_stream)
 891     rv = request_->upload_data_stream->Init(io_callback_);
 892   return rv;
 893 }
 894
 895 int HttpNetworkTransaction::DoInitRequestBodyComplete(int result) {
 896   if (result == OK)
 897     next_state_ = STATE_BUILD_REQUEST;
 898   return result;
 899 }
 900
 901 int HttpNetworkTransaction::DoBuildRequest() {
 902   next_state_ = STATE_BUILD_REQUEST_COMPLETE;
 903   headers_valid_ = false;
 904
 905   // This is constructed lazily (instead of within our Start method), so that
 906   // we have proxy info available.
 907   if (request_headers_.IsEmpty()) {
 908     bool using_proxy = (proxy_info_.is_http() || proxy_info_.is_https()) &&
 909                         !is_https_request();
 910     BuildRequestHeaders(using_proxy);
 911   }
 912
 913   return OK;
 914 }
 915
 916 int HttpNetworkTransaction::DoBuildRequestComplete(int result) {
 917   if (result == OK)
 918     next_state_ = STATE_SEND_REQUEST;
 919   return result;
 920 }
 921
 922 int HttpNetworkTransaction::DoSendRequest() {
 923   send_start_time_ = base::TimeTicks::Now();
 924   next_state_ = STATE_SEND_REQUEST_COMPLETE;
 925
 926   return stream_->SendRequest(request_headers_, &response_, io_callback_);
 927 }
 928
 929 int HttpNetworkTransaction::DoSendRequestComplete(int result) {
 930   send_end_time_ = base::TimeTicks::Now();
 931   if (result < 0)
 932     return HandleIOError(result);
 933   response_.network_accessed = true;
 934   next_state_ = STATE_READ_HEADERS;
 935   return OK;
 936 }
 937
 938 int HttpNetworkTransaction::DoReadHeaders() {
 939   next_state_ = STATE_READ_HEADERS_COMPLETE;
 940   return stream_->ReadResponseHeaders(io_callback_);
 941 }
 942
 943 int HttpNetworkTransaction::DoReadHeadersComplete(int result) {
 944   // We can get a certificate error or ERR_SSL_CLIENT_AUTH_CERT_NEEDED here
 945   // due to SSL renegotiation.
 946   if (IsCertificateError(result)) {
 947     // We don't handle a certificate error during SSL renegotiation, so we
 948     // have to return an error that's not in the certificate error range
 949     // (-2xx).
 950     LOG(ERROR) << "Got a server certificate with error " << result
 951                << " during SSL renegotiation";
 952     result = ERR_CERT_ERROR_IN_SSL_RENEGOTIATION;
 953   } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
 954     // TODO(wtc): Need a test case for this code path!
 955     DCHECK(stream_.get());
 956     DCHECK(is_https_request());
 957     response_.cert_request_info = new SSLCertRequestInfo;
 958     stream_->GetSSLCertRequestInfo(response_.cert_request_info.get());
 959     result = HandleCertificateRequest(result);
 960     if (result == OK)
 961       return result;
 962   }
 963
 964   // ERR_CONNECTION_CLOSED is treated differently at this point; if partial
 965   // response headers were received, we do the best we can to make sense of it
 966   // and send it back up the stack.
 967   //
 968   // TODO(davidben): Consider moving this to HttpBasicStream, It's a little
 969   // bizarre for SPDY. Assuming this logic is useful at all.
 970   // TODO(davidben): Bubble the error code up so we do not cache?
 971   if (result == ERR_CONNECTION_CLOSED && response_.headers.get())
 972     result = OK;
 973
 974   if (result < 0)
 975     return HandleIOError(result);
 976
 977   DCHECK(response_.headers.get());
 978
 979   // On a 408 response from the server ("Request Timeout") on a stale socket,
 980   // retry the request.
 981   // Headers can be NULL because of http://crbug.com/384554.
 982   if (response_.headers.get() && response_.headers->response_code() == 408 &&
 983       stream_->IsConnectionReused()) {
 984     net_log_.AddEventWithNetErrorCode(
 985         NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR,
 986         response_.headers->response_code());
 987     // This will close the socket - it would be weird to try and reuse it, even
 988     // if the server doesn't actually close it.
 989     ResetConnectionAndRequestForResend();
 990     return OK;
 991   }
 992
 993   // Like Net.HttpResponseCode, but only for MAIN_FRAME loads.
 994   if (request_->load_flags & LOAD_MAIN_FRAME) {
 995     const int response_code = response_.headers->response_code();
 996     UMA_HISTOGRAM_ENUMERATION(
 997         "Net.HttpResponseCode_Nxx_MainFrame", response_code/100, 10);
 998   }
 999
1000   net_log_.AddEvent(
1001       NetLog::TYPE_HTTP_TRANSACTION_READ_RESPONSE_HEADERS,
1002       base::Bind(&HttpResponseHeaders::NetLogCallback, response_.headers));
1003
1004   if (response_.headers->GetParsedHttpVersion() < HttpVersion(1, 0)) {
1005     // HTTP/0.9 doesn't support the PUT method, so lack of response headers
1006     // indicates a buggy server.  See:
1007     // https://bugzilla.mozilla.org/show_bug.cgi?id=193921
1008     if (request_->method == "PUT")
1009       return ERR_METHOD_NOT_SUPPORTED;
1010   }
1011
1012   // Check for an intermediate 100 Continue response.  An origin server is
1013   // allowed to send this response even if we didn't ask for it, so we just
1014   // need to skip over it.
1015   // We treat any other 1xx in this same way (although in practice getting
1016   // a 1xx that isn't a 100 is rare).
1017   // Unless this is a WebSocket request, in which case we pass it on up.
1018   if (response_.headers->response_code() / 100 == 1 &&
1019       !ForWebSocketHandshake()) {
1020     response_.headers = new HttpResponseHeaders(std::string());
1021     next_state_ = STATE_READ_HEADERS;
1022     return OK;
1023   }
1024
1025   ProcessAlternateProtocol(session_, *response_.headers.get(),
1026                            HostPortPair::FromURL(request_->url));
1027
1028   int rv = HandleAuthChallenge();
1029   if (rv != OK)
1030     return rv;
1031
1032   if (is_https_request())
1033     stream_->GetSSLInfo(&response_.ssl_info);
1034
1035   headers_valid_ = true;
1036
1037   if (session_->huffman_aggregator()) {
1038     session_->huffman_aggregator()->AggregateTransactionCharacterCounts(
1039         *request_,
1040         request_headers_,
1041         proxy_info_.proxy_server(),
1042         *response_.headers.get());
1043   }
1044   return OK;
1045 }
1046
1047 int HttpNetworkTransaction::DoReadBody() {
1048   DCHECK(read_buf_.get());
1049   DCHECK_GT(read_buf_len_, 0);
1050   DCHECK(stream_ != NULL);
1051
1052   next_state_ = STATE_READ_BODY_COMPLETE;
1053   return stream_->ReadResponseBody(
1054       read_buf_.get(), read_buf_len_, io_callback_);
1055 }
1056
1057 int HttpNetworkTransaction::DoReadBodyComplete(int result) {
1058   // We are done with the Read call.
1059   bool done = false;
1060   if (result <= 0) {
1061     DCHECK_NE(ERR_IO_PENDING, result);
1062     done = true;
1063   }
1064
1065   bool keep_alive = false;
1066   if (stream_->IsResponseBodyComplete()) {
1067     // Note: Just because IsResponseBodyComplete is true, we're not
1068     // necessarily "done".  We're only "done" when it is the last
1069     // read on this HttpNetworkTransaction, which will be signified
1070     // by a zero-length read.
1071     // TODO(mbelshe): The keepalive property is really a property of
1072     //    the stream.  No need to compute it here just to pass back
1073     //    to the stream's Close function.
1074     // TODO(rtenneti): CanFindEndOfResponse should return false if there are no
1075     // ResponseHeaders.
1076     if (stream_->CanFindEndOfResponse()) {
1077       HttpResponseHeaders* headers = GetResponseHeaders();
1078       if (headers)
1079         keep_alive = headers->IsKeepAlive();
1080     }
1081   }
1082
1083   // Clean up connection if we are done.
1084   if (done) {
1085     stream_->Close(!keep_alive);
1086     // Note: we don't reset the stream here.  We've closed it, but we still
1087     // need it around so that callers can call methods such as
1088     // GetUploadProgress() and have them be meaningful.
1089     // TODO(mbelshe): This means we closed the stream here, and we close it
1090     // again in ~HttpNetworkTransaction.  Clean that up.
1091
1092     // The next Read call will return 0 (EOF).
1093   }
1094
1095   // Clear these to avoid leaving around old state.
1096   read_buf_ = NULL;
1097   read_buf_len_ = 0;
1098
1099   return result;
1100 }
1101
1102 int HttpNetworkTransaction::DoDrainBodyForAuthRestart() {
1103   // This method differs from DoReadBody only in the next_state_.  So we just
1104   // call DoReadBody and override the next_state_.  Perhaps there is a more
1105   // elegant way for these two methods to share code.
1106   int rv = DoReadBody();
1107   DCHECK(next_state_ == STATE_READ_BODY_COMPLETE);
1108   next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE;
1109   return rv;
1110 }
1111
1112 // TODO(wtc): This method and the DoReadBodyComplete method are almost
1113 // the same.  Figure out a good way for these two methods to share code.
1114 int HttpNetworkTransaction::DoDrainBodyForAuthRestartComplete(int result) {
1115   // keep_alive defaults to true because the very reason we're draining the
1116   // response body is to reuse the connection for auth restart.
1117   bool done = false, keep_alive = true;
1118   if (result < 0) {
1119     // Error or closed connection while reading the socket.
1120     done = true;
1121     keep_alive = false;
1122   } else if (stream_->IsResponseBodyComplete()) {
1123     done = true;
1124   }
1125
1126   if (done) {
1127     DidDrainBodyForAuthRestart(keep_alive);
1128   } else {
1129     // Keep draining.
1130     next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
1131   }
1132
1133   return OK;
1134 }
1135
1136 int HttpNetworkTransaction::HandleCertificateRequest(int error) {
1137   // There are two paths through which the server can request a certificate
1138   // from us.  The first is during the initial handshake, the second is
1139   // during SSL renegotiation.
1140   //
1141   // In both cases, we want to close the connection before proceeding.
1142   // We do this for two reasons:
1143   //   First, we don't want to keep the connection to the server hung for a
1144   //   long time while the user selects a certificate.
1145   //   Second, even if we did keep the connection open, NSS has a bug where
1146   //   restarting the handshake for ClientAuth is currently broken.
1147   DCHECK_EQ(error, ERR_SSL_CLIENT_AUTH_CERT_NEEDED);
1148
1149   if (stream_.get()) {
1150     // Since we already have a stream, we're being called as part of SSL
1151     // renegotiation.
1152     DCHECK(!stream_request_.get());
1153     total_received_bytes_ += stream_->GetTotalReceivedBytes();
1154     stream_->Close(true);
1155     stream_.reset();
1156   }
1157
1158   // The server is asking for a client certificate during the initial
1159   // handshake.
1160   stream_request_.reset();
1161
1162   // If the user selected one of the certificates in client_certs or declined
1163   // to provide one for this server before, use the past decision
1164   // automatically.
1165   scoped_refptr<X509Certificate> client_cert;
1166   bool found_cached_cert = session_->ssl_client_auth_cache()->Lookup(
1167       response_.cert_request_info->host_and_port, &client_cert);
1168   if (!found_cached_cert)
1169     return error;
1170
1171   // Check that the certificate selected is still a certificate the server
1172   // is likely to accept, based on the criteria supplied in the
1173   // CertificateRequest message.
1174   if (client_cert.get()) {
1175     const std::vector<std::string>& cert_authorities =
1176         response_.cert_request_info->cert_authorities;
1177
1178     bool cert_still_valid = cert_authorities.empty() ||
1179         client_cert->IsIssuedByEncoded(cert_authorities);
1180     if (!cert_still_valid)
1181       return error;
1182   }
1183
1184   // TODO(davidben): Add a unit test which covers this path; we need to be
1185   // able to send a legitimate certificate and also bypass/clear the
1186   // SSL session cache.
1187   SSLConfig* ssl_config = response_.cert_request_info->is_proxy ?
1188       &proxy_ssl_config_ : &server_ssl_config_;
1189   ssl_config->send_client_cert = true;
1190   ssl_config->client_cert = client_cert;
1191   next_state_ = STATE_CREATE_STREAM;
1192   // Reset the other member variables.
1193   // Note: this is necessary only with SSL renegotiation.
1194   ResetStateForRestart();
1195   return OK;
1196 }
1197
1198 void HttpNetworkTransaction::HandleClientAuthError(int error) {
1199   if (server_ssl_config_.send_client_cert &&
1200       (error == ERR_SSL_PROTOCOL_ERROR || IsClientCertificateError(error))) {
1201     session_->ssl_client_auth_cache()->Remove(
1202         HostPortPair::FromURL(request_->url));
1203   }
1204 }
1205
1206 // TODO(rch): This does not correctly handle errors when an SSL proxy is
1207 // being used, as all of the errors are handled as if they were generated
1208 // by the endpoint host, request_->url, rather than considering if they were
1209 // generated by the SSL proxy. http://crbug.com/69329
1210 int HttpNetworkTransaction::HandleSSLHandshakeError(int error) {
1211   DCHECK(request_);
1212   HandleClientAuthError(error);
1213
1214   bool should_fallback = false;
1215   uint16 version_max = server_ssl_config_.version_max;
1216
1217   switch (error) {
1218     case ERR_CONNECTION_CLOSED:
1219     case ERR_SSL_PROTOCOL_ERROR:
1220     case ERR_SSL_VERSION_OR_CIPHER_MISMATCH:
1221       if (version_max >= SSL_PROTOCOL_VERSION_TLS1 &&
1222           version_max > server_ssl_config_.version_min) {
1223         // This could be a TLS-intolerant server or a server that chose a
1224         // cipher suite defined only for higher protocol versions (such as
1225         // an SSL 3.0 server that chose a TLS-only cipher suite).  Fall
1226         // back to the next lower version and retry.
1227         // NOTE: if the SSLClientSocket class doesn't support TLS 1.1,
1228         // specifying TLS 1.1 in version_max will result in a TLS 1.0
1229         // handshake, so falling back from TLS 1.1 to TLS 1.0 will simply
1230         // repeat the TLS 1.0 handshake. To avoid this problem, the default
1231         // version_max should match the maximum protocol version supported
1232         // by the SSLClientSocket class.
1233         version_max--;
1234
1235         // Fallback to the lower SSL version.
1236         // While SSL 3.0 fallback should be eliminated because of security
1237         // reasons, there is a high risk of breaking the servers if this is
1238         // done in general.
1239         should_fallback = true;
1240       }
1241       break;
1242     case ERR_CONNECTION_RESET:
1243       if (version_max >= SSL_PROTOCOL_VERSION_TLS1_1 &&
1244           version_max > server_ssl_config_.version_min) {
1245         // Some network devices that inspect application-layer packets seem to
1246         // inject TCP reset packets to break the connections when they see TLS
1247         // 1.1 in ClientHello or ServerHello. See http://crbug.com/130293.
1248         //
1249         // Only allow ERR_CONNECTION_RESET to trigger a fallback from TLS 1.1 or
1250         // 1.2. We don't lose much in this fallback because the explicit IV for
1251         // CBC mode in TLS 1.1 is approximated by record splitting in TLS
1252         // 1.0. The fallback will be more painful for TLS 1.2 when we have GCM
1253         // support.
1254         //
1255         // ERR_CONNECTION_RESET is a common network error, so we don't want it
1256         // to trigger a version fallback in general, especially the TLS 1.0 ->
1257         // SSL 3.0 fallback, which would drop TLS extensions.
1258         version_max--;
1259         should_fallback = true;
1260       }
1261       break;
1262     case ERR_SSL_BAD_RECORD_MAC_ALERT:
1263       if (version_max >= SSL_PROTOCOL_VERSION_TLS1_1 &&
1264           version_max > server_ssl_config_.version_min) {
1265         // Some broken SSL devices negotiate TLS 1.0 when sent a TLS 1.1 or
1266         // 1.2 ClientHello, but then return a bad_record_mac alert. See
1267         // crbug.com/260358. In order to make the fallback as minimal as
1268         // possible, this fallback is only triggered for >= TLS 1.1.
1269         version_max--;
1270         should_fallback = true;
1271       }
1272       break;
1273     case ERR_SSL_INAPPROPRIATE_FALLBACK:
1274       // The server told us that we should not have fallen back. A buggy server
1275       // could trigger ERR_SSL_INAPPROPRIATE_FALLBACK with the initial
1276       // connection. |fallback_error_code_| is initialised to
1277       // ERR_SSL_INAPPROPRIATE_FALLBACK to catch this case.
1278       error = fallback_error_code_;
1279       break;
1280   }
1281
1282   if (should_fallback) {
1283     net_log_.AddEvent(
1284         NetLog::TYPE_SSL_VERSION_FALLBACK,
1285         base::Bind(&NetLogSSLVersionFallbackCallback,
1286                    &request_->url, error, server_ssl_config_.version_max,
1287                    version_max));
1288     fallback_error_code_ = error;
1289     server_ssl_config_.version_max = version_max;
1290     server_ssl_config_.version_fallback = true;
1291     ResetConnectionAndRequestForResend();
1292     error = OK;
1293   }
1294
1295   return error;
1296 }
1297
1298 // This method determines whether it is safe to resend the request after an
1299 // IO error.  It can only be called in response to request header or body
1300 // write errors or response header read errors.  It should not be used in
1301 // other cases, such as a Connect error.
1302 int HttpNetworkTransaction::HandleIOError(int error) {
1303   // Because the peer may request renegotiation with client authentication at
1304   // any time, check and handle client authentication errors.
1305   HandleClientAuthError(error);
1306
1307   switch (error) {
1308     // If we try to reuse a connection that the server is in the process of
1309     // closing, we may end up successfully writing out our request (or a
1310     // portion of our request) only to find a connection error when we try to
1311     // read from (or finish writing to) the socket.
1312     case ERR_CONNECTION_RESET:
1313     case ERR_CONNECTION_CLOSED:
1314     case ERR_CONNECTION_ABORTED:
1315     // There can be a race between the socket pool checking checking whether a
1316     // socket is still connected, receiving the FIN, and sending/reading data
1317     // on a reused socket.  If we receive the FIN between the connectedness
1318     // check and writing/reading from the socket, we may first learn the socket
1319     // is disconnected when we get a ERR_SOCKET_NOT_CONNECTED.  This will most
1320     // likely happen when trying to retrieve its IP address.
1321     // See http://crbug.com/105824 for more details.
1322     case ERR_SOCKET_NOT_CONNECTED:
1323     // If a socket is closed on its initial request, HttpStreamParser returns
1324     // ERR_EMPTY_RESPONSE. This may still be close/reuse race if the socket was
1325     // preconnected but failed to be used before the server timed it out.
1326     case ERR_EMPTY_RESPONSE:
1327       if (ShouldResendRequest()) {
1328         net_log_.AddEventWithNetErrorCode(
1329             NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR, error);
1330         ResetConnectionAndRequestForResend();
1331         error = OK;
1332       }
1333       break;
1334     case ERR_SPDY_PING_FAILED:
1335     case ERR_SPDY_SERVER_REFUSED_STREAM:
1336     case ERR_QUIC_HANDSHAKE_FAILED:
1337       net_log_.AddEventWithNetErrorCode(
1338           NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR, error);
1339       ResetConnectionAndRequestForResend();
1340       error = OK;
1341       break;
1342   }
1343   return error;
1344 }
1345
1346 void HttpNetworkTransaction::ResetStateForRestart() {
1347   ResetStateForAuthRestart();
1348   if (stream_)
1349     total_received_bytes_ += stream_->GetTotalReceivedBytes();
1350   stream_.reset();
1351 }
1352
1353 void HttpNetworkTransaction::ResetStateForAuthRestart() {
1354   send_start_time_ = base::TimeTicks();
1355   send_end_time_ = base::TimeTicks();
1356
1357   pending_auth_target_ = HttpAuth::AUTH_NONE;
1358   read_buf_ = NULL;
1359   read_buf_len_ = 0;
1360   headers_valid_ = false;
1361   request_headers_.Clear();
1362   response_ = HttpResponseInfo();
1363   establishing_tunnel_ = false;
1364 }
1365
1366 HttpResponseHeaders* HttpNetworkTransaction::GetResponseHeaders() const {
1367   return response_.headers.get();
1368 }
1369
1370 bool HttpNetworkTransaction::ShouldResendRequest() const {
1371   bool connection_is_proven = stream_->IsConnectionReused();
1372   bool has_received_headers = GetResponseHeaders() != NULL;
1373
1374   // NOTE: we resend a request only if we reused a keep-alive connection.
1375   // This automatically prevents an infinite resend loop because we'll run
1376   // out of the cached keep-alive connections eventually.
1377   if (connection_is_proven && !has_received_headers)
1378     return true;
1379   return false;
1380 }
1381
1382 void HttpNetworkTransaction::ResetConnectionAndRequestForResend() {
1383   if (stream_.get()) {
1384     stream_->Close(true);
1385     stream_.reset();
1386   }
1387
1388   // We need to clear request_headers_ because it contains the real request
1389   // headers, but we may need to resend the CONNECT request first to recreate
1390   // the SSL tunnel.
1391   request_headers_.Clear();
1392   next_state_ = STATE_CREATE_STREAM;  // Resend the request.
1393 }
1394
1395 bool HttpNetworkTransaction::ShouldApplyProxyAuth() const {
1396   return !is_https_request() &&
1397       (proxy_info_.is_https() || proxy_info_.is_http());
1398 }
1399
1400 bool HttpNetworkTransaction::ShouldApplyServerAuth() const {
1401   return !(request_->load_flags & LOAD_DO_NOT_SEND_AUTH_DATA);
1402 }
1403
1404 int HttpNetworkTransaction::HandleAuthChallenge() {
1405   scoped_refptr<HttpResponseHeaders> headers(GetResponseHeaders());
1406   DCHECK(headers.get());
1407
1408   int status = headers->response_code();
1409   if (status != HTTP_UNAUTHORIZED &&
1410       status != HTTP_PROXY_AUTHENTICATION_REQUIRED)
1411     return OK;
1412   HttpAuth::Target target = status == HTTP_PROXY_AUTHENTICATION_REQUIRED ?
1413                             HttpAuth::AUTH_PROXY : HttpAuth::AUTH_SERVER;
1414   if (target == HttpAuth::AUTH_PROXY && proxy_info_.is_direct())
1415     return ERR_UNEXPECTED_PROXY_AUTH;
1416
1417   // This case can trigger when an HTTPS server responds with a "Proxy
1418   // authentication required" status code through a non-authenticating
1419   // proxy.
1420   if (!auth_controllers_[target].get())
1421     return ERR_UNEXPECTED_PROXY_AUTH;
1422
1423   int rv = auth_controllers_[target]->HandleAuthChallenge(
1424       headers, (request_->load_flags & LOAD_DO_NOT_SEND_AUTH_DATA) != 0, false,
1425       net_log_);
1426   if (auth_controllers_[target]->HaveAuthHandler())
1427       pending_auth_target_ = target;
1428
1429   scoped_refptr<AuthChallengeInfo> auth_info =
1430       auth_controllers_[target]->auth_info();
1431   if (auth_info.get())
1432       response_.auth_challenge = auth_info;
1433
1434   return rv;
1435 }
1436
1437 bool HttpNetworkTransaction::HaveAuth(HttpAuth::Target target) const {
1438   return auth_controllers_[target].get() &&
1439       auth_controllers_[target]->HaveAuth();
1440 }
1441
1442 GURL HttpNetworkTransaction::AuthURL(HttpAuth::Target target) const {
1443   switch (target) {
1444     case HttpAuth::AUTH_PROXY: {
1445       if (!proxy_info_.proxy_server().is_valid() ||
1446           proxy_info_.proxy_server().is_direct()) {
1447         return GURL();  // There is no proxy server.
1448       }
1449       const char* scheme = proxy_info_.is_https() ? "https://" : "http://";
1450       return GURL(scheme +
1451                   proxy_info_.proxy_server().host_port_pair().ToString());
1452     }
1453     case HttpAuth::AUTH_SERVER:
1454       if (ForWebSocketHandshake()) {
1455         const GURL& url = request_->url;
1456         url::Replacements<char> ws_to_http;
1457         if (url.SchemeIs("ws")) {
1458           ws_to_http.SetScheme("http", url::Component(0, 4));
1459         } else {
1460           DCHECK(url.SchemeIs("wss"));
1461           ws_to_http.SetScheme("https", url::Component(0, 5));
1462         }
1463         return url.ReplaceComponents(ws_to_http);
1464       }
1465       return request_->url;
1466     default:
1467      return GURL();
1468   }
1469 }
1470
1471 bool HttpNetworkTransaction::ForWebSocketHandshake() const {
1472   return websocket_handshake_stream_base_create_helper_ &&
1473          request_->url.SchemeIsWSOrWSS();
1474 }
1475
1476 #define STATE_CASE(s) \
1477   case s: \
1478     description = base::StringPrintf("%s (0x%08X)", #s, s); \
1479     break
1480
1481 std::string HttpNetworkTransaction::DescribeState(State state) {
1482   std::string description;
1483   switch (state) {
1484     STATE_CASE(STATE_NOTIFY_BEFORE_CREATE_STREAM);
1485     STATE_CASE(STATE_CREATE_STREAM);
1486     STATE_CASE(STATE_CREATE_STREAM_COMPLETE);
1487     STATE_CASE(STATE_INIT_REQUEST_BODY);
1488     STATE_CASE(STATE_INIT_REQUEST_BODY_COMPLETE);
1489     STATE_CASE(STATE_BUILD_REQUEST);
1490     STATE_CASE(STATE_BUILD_REQUEST_COMPLETE);
1491     STATE_CASE(STATE_SEND_REQUEST);
1492     STATE_CASE(STATE_SEND_REQUEST_COMPLETE);
1493     STATE_CASE(STATE_READ_HEADERS);
1494     STATE_CASE(STATE_READ_HEADERS_COMPLETE);
1495     STATE_CASE(STATE_READ_BODY);
1496     STATE_CASE(STATE_READ_BODY_COMPLETE);
1497     STATE_CASE(STATE_DRAIN_BODY_FOR_AUTH_RESTART);
1498     STATE_CASE(STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE);
1499     STATE_CASE(STATE_NONE);
1500     default:
1501       description = base::StringPrintf("Unknown state 0x%08X (%u)", state,
1502                                        state);
1503       break;
1504   }
1505   return description;
1506 }
1507
1508 #undef STATE_CASE
1509
1510 }  // namespace net