http_network_transaction.cc revision 3551c9c881056c480085172ff9840cab31610854 
1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "net/http/http_network_transaction.h"
6
7#include <set>
8#include <vector>
9
10#include "base/bind.h"
11#include "base/bind_helpers.h"
12#include "base/compiler_specific.h"
13#include "base/format_macros.h"
14#include "base/memory/scoped_ptr.h"
15#include "base/metrics/field_trial.h"
16#include "base/metrics/histogram.h"
17#include "base/metrics/stats_counters.h"
18#include "base/stl_util.h"
19#include "base/strings/string_number_conversions.h"
20#include "base/strings/string_util.h"
21#include "base/strings/stringprintf.h"
22#include "base/values.h"
23#include "build/build_config.h"
24#include "net/base/auth.h"
25#include "net/base/host_port_pair.h"
26#include "net/base/io_buffer.h"
27#include "net/base/load_flags.h"
28#include "net/base/load_timing_info.h"
29#include "net/base/net_errors.h"
30#include "net/base/net_util.h"
31#include "net/base/upload_data_stream.h"
32#include "net/http/http_auth.h"
33#include "net/http/http_auth_handler.h"
34#include "net/http/http_auth_handler_factory.h"
35#include "net/http/http_basic_stream.h"
36#include "net/http/http_chunked_decoder.h"
37#include "net/http/http_network_session.h"
38#include "net/http/http_proxy_client_socket.h"
39#include "net/http/http_proxy_client_socket_pool.h"
40#include "net/http/http_request_headers.h"
41#include "net/http/http_request_info.h"
42#include "net/http/http_response_headers.h"
43#include "net/http/http_response_info.h"
44#include "net/http/http_server_properties.h"
45#include "net/http/http_status_code.h"
46#include "net/http/http_stream_base.h"
47#include "net/http/http_stream_factory.h"
48#include "net/http/http_util.h"
49#include "net/http/transport_security_state.h"
50#include "net/http/url_security_manager.h"
51#include "net/socket/client_socket_factory.h"
52#include "net/socket/socks_client_socket_pool.h"
53#include "net/socket/ssl_client_socket.h"
54#include "net/socket/ssl_client_socket_pool.h"
55#include "net/socket/transport_client_socket_pool.h"
56#include "net/spdy/spdy_http_stream.h"
57#include "net/spdy/spdy_session.h"
58#include "net/spdy/spdy_session_pool.h"
59#include "net/ssl/ssl_cert_request_info.h"
60#include "net/ssl/ssl_connection_status_flags.h"
61#include "url/gurl.h"
62
63using base::Time;
64
65namespace net {
66
67namespace {
68
69void ProcessAlternateProtocol(
70    HttpStreamFactory* factory,
71    const base::WeakPtr<HttpServerProperties>& http_server_properties,
72    const HttpResponseHeaders& headers,
73    const HostPortPair& http_host_port_pair) {
74  std::string alternate_protocol_str;
75
76  if (!headers.EnumerateHeader(NULL, kAlternateProtocolHeader,
77                               &alternate_protocol_str)) {
78    // Header is not present.
79    return;
80  }
81
82  factory->ProcessAlternateProtocol(http_server_properties,
83                                    alternate_protocol_str,
84                                    http_host_port_pair);
85}
86
87// Returns true if |error| is a client certificate authentication error.
88bool IsClientCertificateError(int error) {
89  switch (error) {
90    case ERR_BAD_SSL_CLIENT_AUTH_CERT:
91    case ERR_SSL_CLIENT_AUTH_PRIVATE_KEY_ACCESS_DENIED:
92    case ERR_SSL_CLIENT_AUTH_CERT_NO_PRIVATE_KEY:
93    case ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED:
94      return true;
95    default:
96      return false;
97  }
98}
99
100base::Value* NetLogSSLVersionFallbackCallback(
101    const GURL* url,
102    int net_error,
103    uint16 version_before,
104    uint16 version_after,
105    NetLog::LogLevel /* log_level */) {
106  base::DictionaryValue* dict = new base::DictionaryValue();
107  dict->SetString("host_and_port", GetHostAndPort(*url));
108  dict->SetInteger("net_error", net_error);
109  dict->SetInteger("version_before", version_before);
110  dict->SetInteger("version_after", version_after);
111  return dict;
112}
113
114}  // namespace
115
116//-----------------------------------------------------------------------------
117
118HttpNetworkTransaction::HttpNetworkTransaction(RequestPriority priority,
119                                               HttpNetworkSession* session)
120    : pending_auth_target_(HttpAuth::AUTH_NONE),
121      io_callback_(base::Bind(&HttpNetworkTransaction::OnIOComplete,
122                              base::Unretained(this))),
123      session_(session),
124      request_(NULL),
125      priority_(priority),
126      headers_valid_(false),
127      logged_response_time_(false),
128      request_headers_(),
129      read_buf_len_(0),
130      next_state_(STATE_NONE),
131      establishing_tunnel_(false) {
132  session->ssl_config_service()->GetSSLConfig(&server_ssl_config_);
133  if (session->http_stream_factory()->has_next_protos()) {
134    server_ssl_config_.next_protos =
135        session->http_stream_factory()->next_protos();
136  }
137  proxy_ssl_config_ = server_ssl_config_;
138}
139
140HttpNetworkTransaction::~HttpNetworkTransaction() {
141  if (stream_.get()) {
142    HttpResponseHeaders* headers = GetResponseHeaders();
143    // TODO(mbelshe): The stream_ should be able to compute whether or not the
144    //                stream should be kept alive.  No reason to compute here
145    //                and pass it in.
146    bool try_to_keep_alive =
147        next_state_ == STATE_NONE &&
148        stream_->CanFindEndOfResponse() &&
149        (!headers || headers->IsKeepAlive());
150    if (!try_to_keep_alive) {
151      stream_->Close(true /* not reusable */);
152    } else {
153      if (stream_->IsResponseBodyComplete()) {
154        // If the response body is complete, we can just reuse the socket.
155        stream_->Close(false /* reusable */);
156      } else if (stream_->IsSpdyHttpStream()) {
157        // Doesn't really matter for SpdyHttpStream. Just close it.
158        stream_->Close(true /* not reusable */);
159      } else {
160        // Otherwise, we try to drain the response body.
161        HttpStreamBase* stream = stream_.release();
162        stream->Drain(session_.get());
163      }
164    }
165  }
166}
167
168int HttpNetworkTransaction::Start(const HttpRequestInfo* request_info,
169                                  const CompletionCallback& callback,
170                                  const BoundNetLog& net_log) {
171  SIMPLE_STATS_COUNTER("HttpNetworkTransaction.Count");
172
173  net_log_ = net_log;
174  request_ = request_info;
175  start_time_ = base::Time::Now();
176
177  if (request_->load_flags & LOAD_DISABLE_CERT_REVOCATION_CHECKING) {
178    server_ssl_config_.rev_checking_enabled = false;
179    proxy_ssl_config_.rev_checking_enabled = false;
180  }
181
182  // Channel ID is enabled unless --disable-tls-channel-id flag is set,
183  // or if privacy mode is enabled.
184  bool channel_id_enabled = server_ssl_config_.channel_id_enabled &&
185      (request_->privacy_mode == kPrivacyModeDisabled);
186  server_ssl_config_.channel_id_enabled = channel_id_enabled;
187
188  next_state_ = STATE_CREATE_STREAM;
189  int rv = DoLoop(OK);
190  if (rv == ERR_IO_PENDING)
191    callback_ = callback;
192  return rv;
193}
194
195int HttpNetworkTransaction::RestartIgnoringLastError(
196    const CompletionCallback& callback) {
197  DCHECK(!stream_.get());
198  DCHECK(!stream_request_.get());
199  DCHECK_EQ(STATE_NONE, next_state_);
200
201  next_state_ = STATE_CREATE_STREAM;
202
203  int rv = DoLoop(OK);
204  if (rv == ERR_IO_PENDING)
205    callback_ = callback;
206  return rv;
207}
208
209int HttpNetworkTransaction::RestartWithCertificate(
210    X509Certificate* client_cert, const CompletionCallback& callback) {
211  // In HandleCertificateRequest(), we always tear down existing stream
212  // requests to force a new connection.  So we shouldn't have one here.
213  DCHECK(!stream_request_.get());
214  DCHECK(!stream_.get());
215  DCHECK_EQ(STATE_NONE, next_state_);
216
217  SSLConfig* ssl_config = response_.cert_request_info->is_proxy ?
218      &proxy_ssl_config_ : &server_ssl_config_;
219  ssl_config->send_client_cert = true;
220  ssl_config->client_cert = client_cert;
221  session_->ssl_client_auth_cache()->Add(
222      response_.cert_request_info->host_and_port, client_cert);
223  // Reset the other member variables.
224  // Note: this is necessary only with SSL renegotiation.
225  ResetStateForRestart();
226  next_state_ = STATE_CREATE_STREAM;
227  int rv = DoLoop(OK);
228  if (rv == ERR_IO_PENDING)
229    callback_ = callback;
230  return rv;
231}
232
233int HttpNetworkTransaction::RestartWithAuth(
234    const AuthCredentials& credentials, const CompletionCallback& callback) {
235  HttpAuth::Target target = pending_auth_target_;
236  if (target == HttpAuth::AUTH_NONE) {
237    NOTREACHED();
238    return ERR_UNEXPECTED;
239  }
240  pending_auth_target_ = HttpAuth::AUTH_NONE;
241
242  auth_controllers_[target]->ResetAuth(credentials);
243
244  DCHECK(callback_.is_null());
245
246  int rv = OK;
247  if (target == HttpAuth::AUTH_PROXY && establishing_tunnel_) {
248    // In this case, we've gathered credentials for use with proxy
249    // authentication of a tunnel.
250    DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
251    DCHECK(stream_request_ != NULL);
252    auth_controllers_[target] = NULL;
253    ResetStateForRestart();
254    rv = stream_request_->RestartTunnelWithProxyAuth(credentials);
255  } else {
256    // In this case, we've gathered credentials for the server or the proxy
257    // but it is not during the tunneling phase.
258    DCHECK(stream_request_ == NULL);
259    PrepareForAuthRestart(target);
260    rv = DoLoop(OK);
261  }
262
263  if (rv == ERR_IO_PENDING)
264    callback_ = callback;
265  return rv;
266}
267
268void HttpNetworkTransaction::PrepareForAuthRestart(HttpAuth::Target target) {
269  DCHECK(HaveAuth(target));
270  DCHECK(!stream_request_.get());
271
272  bool keep_alive = false;
273  // Even if the server says the connection is keep-alive, we have to be
274  // able to find the end of each response in order to reuse the connection.
275  if (GetResponseHeaders()->IsKeepAlive() &&
276      stream_->CanFindEndOfResponse()) {
277    // If the response body hasn't been completely read, we need to drain
278    // it first.
279    if (!stream_->IsResponseBodyComplete()) {
280      next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
281      read_buf_ = new IOBuffer(kDrainBodyBufferSize);  // A bit bucket.
282      read_buf_len_ = kDrainBodyBufferSize;
283      return;
284    }
285    keep_alive = true;
286  }
287
288  // We don't need to drain the response body, so we act as if we had drained
289  // the response body.
290  DidDrainBodyForAuthRestart(keep_alive);
291}
292
293void HttpNetworkTransaction::DidDrainBodyForAuthRestart(bool keep_alive) {
294  DCHECK(!stream_request_.get());
295
296  if (stream_.get()) {
297    HttpStream* new_stream = NULL;
298    if (keep_alive && stream_->IsConnectionReusable()) {
299      // We should call connection_->set_idle_time(), but this doesn't occur
300      // often enough to be worth the trouble.
301      stream_->SetConnectionReused();
302      new_stream =
303          static_cast<HttpStream*>(stream_.get())->RenewStreamForAuth();
304    }
305
306    if (!new_stream) {
307      // Close the stream and mark it as not_reusable.  Even in the
308      // keep_alive case, we've determined that the stream_ is not
309      // reusable if new_stream is NULL.
310      stream_->Close(true);
311      next_state_ = STATE_CREATE_STREAM;
312    } else {
313      next_state_ = STATE_INIT_STREAM;
314    }
315    stream_.reset(new_stream);
316  }
317
318  // Reset the other member variables.
319  ResetStateForAuthRestart();
320}
321
322bool HttpNetworkTransaction::IsReadyToRestartForAuth() {
323  return pending_auth_target_ != HttpAuth::AUTH_NONE &&
324      HaveAuth(pending_auth_target_);
325}
326
327int HttpNetworkTransaction::Read(IOBuffer* buf, int buf_len,
328                                 const CompletionCallback& callback) {
329  DCHECK(buf);
330  DCHECK_LT(0, buf_len);
331
332  State next_state = STATE_NONE;
333
334  scoped_refptr<HttpResponseHeaders> headers(GetResponseHeaders());
335  if (headers_valid_ && headers.get() && stream_request_.get()) {
336    // We're trying to read the body of the response but we're still trying
337    // to establish an SSL tunnel through an HTTP proxy.  We can't read these
338    // bytes when establishing a tunnel because they might be controlled by
339    // an active network attacker.  We don't worry about this for HTTP
340    // because an active network attacker can already control HTTP sessions.
341    // We reach this case when the user cancels a 407 proxy auth prompt.  We
342    // also don't worry about this for an HTTPS Proxy, because the
343    // communication with the proxy is secure.
344    // See http://crbug.com/8473.
345    DCHECK(proxy_info_.is_http() || proxy_info_.is_https());
346    DCHECK_EQ(headers->response_code(), HTTP_PROXY_AUTHENTICATION_REQUIRED);
347    LOG(WARNING) << "Blocked proxy response with status "
348                 << headers->response_code() << " to CONNECT request for "
349                 << GetHostAndPort(request_->url) << ".";
350    return ERR_TUNNEL_CONNECTION_FAILED;
351  }
352
353  // Are we using SPDY or HTTP?
354  next_state = STATE_READ_BODY;
355
356  read_buf_ = buf;
357  read_buf_len_ = buf_len;
358
359  next_state_ = next_state;
360  int rv = DoLoop(OK);
361  if (rv == ERR_IO_PENDING)
362    callback_ = callback;
363  return rv;
364}
365
366bool HttpNetworkTransaction::GetFullRequestHeaders(
367    HttpRequestHeaders* headers) const {
368  // TODO(ttuttle): Make sure we've populated request_headers_.
369  *headers = request_headers_;
370  return true;
371}
372
373const HttpResponseInfo* HttpNetworkTransaction::GetResponseInfo() const {
374  return ((headers_valid_ && response_.headers.get()) ||
375          response_.ssl_info.cert.get() || response_.cert_request_info.get())
376             ? &response_
377             : NULL;
378}
379
380LoadState HttpNetworkTransaction::GetLoadState() const {
381  // TODO(wtc): Define a new LoadState value for the
382  // STATE_INIT_CONNECTION_COMPLETE state, which delays the HTTP request.
383  switch (next_state_) {
384    case STATE_CREATE_STREAM_COMPLETE:
385      return stream_request_->GetLoadState();
386    case STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE:
387    case STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE:
388    case STATE_SEND_REQUEST_COMPLETE:
389      return LOAD_STATE_SENDING_REQUEST;
390    case STATE_READ_HEADERS_COMPLETE:
391      return LOAD_STATE_WAITING_FOR_RESPONSE;
392    case STATE_READ_BODY_COMPLETE:
393      return LOAD_STATE_READING_RESPONSE;
394    default:
395      return LOAD_STATE_IDLE;
396  }
397}
398
399UploadProgress HttpNetworkTransaction::GetUploadProgress() const {
400  if (!stream_.get())
401    return UploadProgress();
402
403  // TODO(bashi): This cast is temporary. Remove later.
404  return static_cast<HttpStream*>(stream_.get())->GetUploadProgress();
405}
406
407bool HttpNetworkTransaction::GetLoadTimingInfo(
408    LoadTimingInfo* load_timing_info) const {
409  if (!stream_ || !stream_->GetLoadTimingInfo(load_timing_info))
410    return false;
411
412  load_timing_info->proxy_resolve_start =
413      proxy_info_.proxy_resolve_start_time();
414  load_timing_info->proxy_resolve_end = proxy_info_.proxy_resolve_end_time();
415  load_timing_info->send_start = send_start_time_;
416  load_timing_info->send_end = send_end_time_;
417  return true;
418}
419
420void HttpNetworkTransaction::SetPriority(RequestPriority priority) {
421  priority_ = priority;
422  if (stream_request_)
423    stream_request_->SetPriority(priority);
424  if (stream_)
425    stream_->SetPriority(priority);
426}
427
428void HttpNetworkTransaction::OnStreamReady(const SSLConfig& used_ssl_config,
429                                           const ProxyInfo& used_proxy_info,
430                                           HttpStreamBase* stream) {
431  DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
432  DCHECK(stream_request_.get());
433
434  stream_.reset(stream);
435  server_ssl_config_ = used_ssl_config;
436  proxy_info_ = used_proxy_info;
437  response_.was_npn_negotiated = stream_request_->was_npn_negotiated();
438  response_.npn_negotiated_protocol = SSLClientSocket::NextProtoToString(
439      stream_request_->protocol_negotiated());
440  response_.was_fetched_via_spdy = stream_request_->using_spdy();
441  response_.was_fetched_via_proxy = !proxy_info_.is_direct();
442
443  OnIOComplete(OK);
444}
445
446void HttpNetworkTransaction::OnWebSocketStreamReady(
447    const SSLConfig& used_ssl_config,
448    const ProxyInfo& used_proxy_info,
449    WebSocketStreamBase* stream) {
450  NOTREACHED() << "This function should never be called.";
451}
452
453void HttpNetworkTransaction::OnStreamFailed(int result,
454                                            const SSLConfig& used_ssl_config) {
455  DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
456  DCHECK_NE(OK, result);
457  DCHECK(stream_request_.get());
458  DCHECK(!stream_.get());
459  server_ssl_config_ = used_ssl_config;
460
461  OnIOComplete(result);
462}
463
464void HttpNetworkTransaction::OnCertificateError(
465    int result,
466    const SSLConfig& used_ssl_config,
467    const SSLInfo& ssl_info) {
468  DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
469  DCHECK_NE(OK, result);
470  DCHECK(stream_request_.get());
471  DCHECK(!stream_.get());
472
473  response_.ssl_info = ssl_info;
474  server_ssl_config_ = used_ssl_config;
475
476  // TODO(mbelshe):  For now, we're going to pass the error through, and that
477  // will close the stream_request in all cases.  This means that we're always
478  // going to restart an entire STATE_CREATE_STREAM, even if the connection is
479  // good and the user chooses to ignore the error.  This is not ideal, but not
480  // the end of the world either.
481
482  OnIOComplete(result);
483}
484
485void HttpNetworkTransaction::OnNeedsProxyAuth(
486    const HttpResponseInfo& proxy_response,
487    const SSLConfig& used_ssl_config,
488    const ProxyInfo& used_proxy_info,
489    HttpAuthController* auth_controller) {
490  DCHECK(stream_request_.get());
491  DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
492
493  establishing_tunnel_ = true;
494  response_.headers = proxy_response.headers;
495  response_.auth_challenge = proxy_response.auth_challenge;
496  headers_valid_ = true;
497  server_ssl_config_ = used_ssl_config;
498  proxy_info_ = used_proxy_info;
499
500  auth_controllers_[HttpAuth::AUTH_PROXY] = auth_controller;
501  pending_auth_target_ = HttpAuth::AUTH_PROXY;
502
503  DoCallback(OK);
504}
505
506void HttpNetworkTransaction::OnNeedsClientAuth(
507    const SSLConfig& used_ssl_config,
508    SSLCertRequestInfo* cert_info) {
509  DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
510
511  server_ssl_config_ = used_ssl_config;
512  response_.cert_request_info = cert_info;
513  OnIOComplete(ERR_SSL_CLIENT_AUTH_CERT_NEEDED);
514}
515
516void HttpNetworkTransaction::OnHttpsProxyTunnelResponse(
517    const HttpResponseInfo& response_info,
518    const SSLConfig& used_ssl_config,
519    const ProxyInfo& used_proxy_info,
520    HttpStreamBase* stream) {
521  DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
522
523  headers_valid_ = true;
524  response_ = response_info;
525  server_ssl_config_ = used_ssl_config;
526  proxy_info_ = used_proxy_info;
527  stream_.reset(stream);
528  stream_request_.reset();  // we're done with the stream request
529  OnIOComplete(ERR_HTTPS_PROXY_TUNNEL_RESPONSE);
530}
531
532bool HttpNetworkTransaction::is_https_request() const {
533  return request_->url.SchemeIs("https");
534}
535
536void HttpNetworkTransaction::DoCallback(int rv) {
537  DCHECK_NE(rv, ERR_IO_PENDING);
538  DCHECK(!callback_.is_null());
539
540  // Since Run may result in Read being called, clear user_callback_ up front.
541  CompletionCallback c = callback_;
542  callback_.Reset();
543  c.Run(rv);
544}
545
546void HttpNetworkTransaction::OnIOComplete(int result) {
547  int rv = DoLoop(result);
548  if (rv != ERR_IO_PENDING)
549    DoCallback(rv);
550}
551
552int HttpNetworkTransaction::DoLoop(int result) {
553  DCHECK(next_state_ != STATE_NONE);
554
555  int rv = result;
556  do {
557    State state = next_state_;
558    next_state_ = STATE_NONE;
559    switch (state) {
560      case STATE_CREATE_STREAM:
561        DCHECK_EQ(OK, rv);
562        rv = DoCreateStream();
563        break;
564      case STATE_CREATE_STREAM_COMPLETE:
565        rv = DoCreateStreamComplete(rv);
566        break;
567      case STATE_INIT_STREAM:
568        DCHECK_EQ(OK, rv);
569        rv = DoInitStream();
570        break;
571      case STATE_INIT_STREAM_COMPLETE:
572        rv = DoInitStreamComplete(rv);
573        break;
574      case STATE_GENERATE_PROXY_AUTH_TOKEN:
575        DCHECK_EQ(OK, rv);
576        rv = DoGenerateProxyAuthToken();
577        break;
578      case STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE:
579        rv = DoGenerateProxyAuthTokenComplete(rv);
580        break;
581      case STATE_GENERATE_SERVER_AUTH_TOKEN:
582        DCHECK_EQ(OK, rv);
583        rv = DoGenerateServerAuthToken();
584        break;
585      case STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE:
586        rv = DoGenerateServerAuthTokenComplete(rv);
587        break;
588      case STATE_INIT_REQUEST_BODY:
589        DCHECK_EQ(OK, rv);
590        rv = DoInitRequestBody();
591        break;
592      case STATE_INIT_REQUEST_BODY_COMPLETE:
593        rv = DoInitRequestBodyComplete(rv);
594        break;
595      case STATE_BUILD_REQUEST:
596        DCHECK_EQ(OK, rv);
597        net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_SEND_REQUEST);
598        rv = DoBuildRequest();
599        break;
600      case STATE_BUILD_REQUEST_COMPLETE:
601        rv = DoBuildRequestComplete(rv);
602        break;
603      case STATE_SEND_REQUEST:
604        DCHECK_EQ(OK, rv);
605        rv = DoSendRequest();
606        break;
607      case STATE_SEND_REQUEST_COMPLETE:
608        rv = DoSendRequestComplete(rv);
609        net_log_.EndEventWithNetErrorCode(
610            NetLog::TYPE_HTTP_TRANSACTION_SEND_REQUEST, rv);
611        break;
612      case STATE_READ_HEADERS:
613        DCHECK_EQ(OK, rv);
614        net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_READ_HEADERS);
615        rv = DoReadHeaders();
616        break;
617      case STATE_READ_HEADERS_COMPLETE:
618        rv = DoReadHeadersComplete(rv);
619        net_log_.EndEventWithNetErrorCode(
620            NetLog::TYPE_HTTP_TRANSACTION_READ_HEADERS, rv);
621        break;
622      case STATE_READ_BODY:
623        DCHECK_EQ(OK, rv);
624        net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_READ_BODY);
625        rv = DoReadBody();
626        break;
627      case STATE_READ_BODY_COMPLETE:
628        rv = DoReadBodyComplete(rv);
629        net_log_.EndEventWithNetErrorCode(
630            NetLog::TYPE_HTTP_TRANSACTION_READ_BODY, rv);
631        break;
632      case STATE_DRAIN_BODY_FOR_AUTH_RESTART:
633        DCHECK_EQ(OK, rv);
634        net_log_.BeginEvent(
635            NetLog::TYPE_HTTP_TRANSACTION_DRAIN_BODY_FOR_AUTH_RESTART);
636        rv = DoDrainBodyForAuthRestart();
637        break;
638      case STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE:
639        rv = DoDrainBodyForAuthRestartComplete(rv);
640        net_log_.EndEventWithNetErrorCode(
641            NetLog::TYPE_HTTP_TRANSACTION_DRAIN_BODY_FOR_AUTH_RESTART, rv);
642        break;
643      default:
644        NOTREACHED() << "bad state";
645        rv = ERR_FAILED;
646        break;
647    }
648  } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
649
650  return rv;
651}
652
653int HttpNetworkTransaction::DoCreateStream() {
654  next_state_ = STATE_CREATE_STREAM_COMPLETE;
655
656  stream_request_.reset(
657      session_->http_stream_factory()->RequestStream(
658          *request_,
659          priority_,
660          server_ssl_config_,
661          proxy_ssl_config_,
662          this,
663          net_log_));
664  DCHECK(stream_request_.get());
665  return ERR_IO_PENDING;
666}
667
668int HttpNetworkTransaction::DoCreateStreamComplete(int result) {
669  if (result == OK) {
670    next_state_ = STATE_INIT_STREAM;
671    DCHECK(stream_.get());
672  } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
673    result = HandleCertificateRequest(result);
674  } else if (result == ERR_HTTPS_PROXY_TUNNEL_RESPONSE) {
675    // Return OK and let the caller read the proxy's error page
676    next_state_ = STATE_NONE;
677    return OK;
678  }
679
680  // Handle possible handshake errors that may have occurred if the stream
681  // used SSL for one or more of the layers.
682  result = HandleSSLHandshakeError(result);
683
684  // At this point we are done with the stream_request_.
685  stream_request_.reset();
686  return result;
687}
688
689int HttpNetworkTransaction::DoInitStream() {
690  DCHECK(stream_.get());
691  next_state_ = STATE_INIT_STREAM_COMPLETE;
692  return stream_->InitializeStream(request_, priority_, net_log_, io_callback_);
693}
694
695int HttpNetworkTransaction::DoInitStreamComplete(int result) {
696  if (result == OK) {
697    next_state_ = STATE_GENERATE_PROXY_AUTH_TOKEN;
698  } else {
699    if (result < 0)
700      result = HandleIOError(result);
701
702    // The stream initialization failed, so this stream will never be useful.
703    stream_.reset();
704  }
705
706  return result;
707}
708
709int HttpNetworkTransaction::DoGenerateProxyAuthToken() {
710  next_state_ = STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE;
711  if (!ShouldApplyProxyAuth())
712    return OK;
713  HttpAuth::Target target = HttpAuth::AUTH_PROXY;
714  if (!auth_controllers_[target].get())
715    auth_controllers_[target] =
716        new HttpAuthController(target,
717                               AuthURL(target),
718                               session_->http_auth_cache(),
719                               session_->http_auth_handler_factory());
720  return auth_controllers_[target]->MaybeGenerateAuthToken(request_,
721                                                           io_callback_,
722                                                           net_log_);
723}
724
725int HttpNetworkTransaction::DoGenerateProxyAuthTokenComplete(int rv) {
726  DCHECK_NE(ERR_IO_PENDING, rv);
727  if (rv == OK)
728    next_state_ = STATE_GENERATE_SERVER_AUTH_TOKEN;
729  return rv;
730}
731
732int HttpNetworkTransaction::DoGenerateServerAuthToken() {
733  next_state_ = STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE;
734  HttpAuth::Target target = HttpAuth::AUTH_SERVER;
735  if (!auth_controllers_[target].get())
736    auth_controllers_[target] =
737        new HttpAuthController(target,
738                               AuthURL(target),
739                               session_->http_auth_cache(),
740                               session_->http_auth_handler_factory());
741  if (!ShouldApplyServerAuth())
742    return OK;
743  return auth_controllers_[target]->MaybeGenerateAuthToken(request_,
744                                                           io_callback_,
745                                                           net_log_);
746}
747
748int HttpNetworkTransaction::DoGenerateServerAuthTokenComplete(int rv) {
749  DCHECK_NE(ERR_IO_PENDING, rv);
750  if (rv == OK)
751    next_state_ = STATE_INIT_REQUEST_BODY;
752  return rv;
753}
754
755void HttpNetworkTransaction::BuildRequestHeaders(bool using_proxy) {
756  request_headers_.SetHeader(HttpRequestHeaders::kHost,
757                             GetHostAndOptionalPort(request_->url));
758
759  // For compat with HTTP/1.0 servers and proxies:
760  if (using_proxy) {
761    request_headers_.SetHeader(HttpRequestHeaders::kProxyConnection,
762                               "keep-alive");
763  } else {
764    request_headers_.SetHeader(HttpRequestHeaders::kConnection, "keep-alive");
765  }
766
767  // Add a content length header?
768  if (request_->upload_data_stream) {
769    if (request_->upload_data_stream->is_chunked()) {
770      request_headers_.SetHeader(
771          HttpRequestHeaders::kTransferEncoding, "chunked");
772    } else {
773      request_headers_.SetHeader(
774          HttpRequestHeaders::kContentLength,
775          base::Uint64ToString(request_->upload_data_stream->size()));
776    }
777  } else if (request_->method == "POST" || request_->method == "PUT" ||
778             request_->method == "HEAD") {
779    // An empty POST/PUT request still needs a content length.  As for HEAD,
780    // IE and Safari also add a content length header.  Presumably it is to
781    // support sending a HEAD request to an URL that only expects to be sent a
782    // POST or some other method that normally would have a message body.
783    request_headers_.SetHeader(HttpRequestHeaders::kContentLength, "0");
784  }
785
786  // Honor load flags that impact proxy caches.
787  if (request_->load_flags & LOAD_BYPASS_CACHE) {
788    request_headers_.SetHeader(HttpRequestHeaders::kPragma, "no-cache");
789    request_headers_.SetHeader(HttpRequestHeaders::kCacheControl, "no-cache");
790  } else if (request_->load_flags & LOAD_VALIDATE_CACHE) {
791    request_headers_.SetHeader(HttpRequestHeaders::kCacheControl, "max-age=0");
792  }
793
794  if (ShouldApplyProxyAuth() && HaveAuth(HttpAuth::AUTH_PROXY))
795    auth_controllers_[HttpAuth::AUTH_PROXY]->AddAuthorizationHeader(
796        &request_headers_);
797  if (ShouldApplyServerAuth() && HaveAuth(HttpAuth::AUTH_SERVER))
798    auth_controllers_[HttpAuth::AUTH_SERVER]->AddAuthorizationHeader(
799        &request_headers_);
800
801  request_headers_.MergeFrom(request_->extra_headers);
802  response_.did_use_http_auth =
803      request_headers_.HasHeader(HttpRequestHeaders::kAuthorization) ||
804      request_headers_.HasHeader(HttpRequestHeaders::kProxyAuthorization);
805}
806
807int HttpNetworkTransaction::DoInitRequestBody() {
808  next_state_ = STATE_INIT_REQUEST_BODY_COMPLETE;
809  int rv = OK;
810  if (request_->upload_data_stream)
811    rv = request_->upload_data_stream->Init(io_callback_);
812  return rv;
813}
814
815int HttpNetworkTransaction::DoInitRequestBodyComplete(int result) {
816  if (result == OK)
817    next_state_ = STATE_BUILD_REQUEST;
818  return result;
819}
820
821int HttpNetworkTransaction::DoBuildRequest() {
822  next_state_ = STATE_BUILD_REQUEST_COMPLETE;
823  headers_valid_ = false;
824
825  // This is constructed lazily (instead of within our Start method), so that
826  // we have proxy info available.
827  if (request_headers_.IsEmpty()) {
828    bool using_proxy = (proxy_info_.is_http() || proxy_info_.is_https()) &&
829                        !is_https_request();
830    BuildRequestHeaders(using_proxy);
831  }
832
833  return OK;
834}
835
836int HttpNetworkTransaction::DoBuildRequestComplete(int result) {
837  if (result == OK)
838    next_state_ = STATE_SEND_REQUEST;
839  return result;
840}
841
842int HttpNetworkTransaction::DoSendRequest() {
843  send_start_time_ = base::TimeTicks::Now();
844  next_state_ = STATE_SEND_REQUEST_COMPLETE;
845
846  return stream_->SendRequest(request_headers_, &response_, io_callback_);
847}
848
849int HttpNetworkTransaction::DoSendRequestComplete(int result) {
850  send_end_time_ = base::TimeTicks::Now();
851  if (result < 0)
852    return HandleIOError(result);
853  response_.network_accessed = true;
854  next_state_ = STATE_READ_HEADERS;
855  return OK;
856}
857
858int HttpNetworkTransaction::DoReadHeaders() {
859  next_state_ = STATE_READ_HEADERS_COMPLETE;
860  return stream_->ReadResponseHeaders(io_callback_);
861}
862
863int HttpNetworkTransaction::HandleConnectionClosedBeforeEndOfHeaders() {
864  if (!response_.headers.get() && !stream_->IsConnectionReused()) {
865    // The connection was closed before any data was sent. Likely an error
866    // rather than empty HTTP/0.9 response.
867    return ERR_EMPTY_RESPONSE;
868  }
869
870  return OK;
871}
872
873int HttpNetworkTransaction::DoReadHeadersComplete(int result) {
874  // We can get a certificate error or ERR_SSL_CLIENT_AUTH_CERT_NEEDED here
875  // due to SSL renegotiation.
876  if (IsCertificateError(result)) {
877    // We don't handle a certificate error during SSL renegotiation, so we
878    // have to return an error that's not in the certificate error range
879    // (-2xx).
880    LOG(ERROR) << "Got a server certificate with error " << result
881               << " during SSL renegotiation";
882    result = ERR_CERT_ERROR_IN_SSL_RENEGOTIATION;
883  } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
884    // TODO(wtc): Need a test case for this code path!
885    DCHECK(stream_.get());
886    DCHECK(is_https_request());
887    response_.cert_request_info = new SSLCertRequestInfo;
888    stream_->GetSSLCertRequestInfo(response_.cert_request_info.get());
889    result = HandleCertificateRequest(result);
890    if (result == OK)
891      return result;
892  }
893
894  if (result < 0 && result != ERR_CONNECTION_CLOSED)
895    return HandleIOError(result);
896
897  if (result == ERR_CONNECTION_CLOSED && ShouldResendRequest(result)) {
898    ResetConnectionAndRequestForResend();
899    return OK;
900  }
901
902  // After we call RestartWithAuth a new response_time will be recorded, and
903  // we need to be cautious about incorrectly logging the duration across the
904  // authentication activity.
905  if (result == OK)
906    LogTransactionConnectedMetrics();
907
908  if (result == ERR_CONNECTION_CLOSED) {
909    // For now, if we get at least some data, we do the best we can to make
910    // sense of it and send it back up the stack.
911    int rv = HandleConnectionClosedBeforeEndOfHeaders();
912    if (rv != OK)
913      return rv;
914  }
915  DCHECK(response_.headers.get());
916
917  // Server-induced fallback is supported only if this is a PAC configured
918  // proxy. See: http://crbug.com/143712
919  if (response_.was_fetched_via_proxy && proxy_info_.did_use_pac_script() &&
920      response_.headers.get() != NULL) {
921    bool should_fallback =
922        response_.headers->HasHeaderValue("connection", "proxy-bypass");
923    // Additionally, fallback if a 500 is returned via the data reduction proxy.
924    // This is conservative, as the 500 might have been generated by the origin,
925    // and not the proxy.
926#if defined(SPDY_PROXY_AUTH_ORIGIN)
927    if (!should_fallback) {
928      should_fallback =
929          response_.headers->response_code() == HTTP_INTERNAL_SERVER_ERROR &&
930          proxy_info_.proxy_server().host_port_pair().Equals(
931              HostPortPair::FromURL(GURL(SPDY_PROXY_AUTH_ORIGIN)));
932    }
933#endif
934    if (should_fallback) {
935      ProxyService* proxy_service = session_->proxy_service();
936      if (proxy_service->MarkProxyAsBad(proxy_info_, net_log_)) {
937        // Only retry in the case of GETs. We don't want to resubmit a POST
938        // if the proxy took some action.
939        if (request_->method == "GET") {
940          ResetConnectionAndRequestForResend();
941          return OK;
942        }
943      }
944    }
945  }
946
947  // Like Net.HttpResponseCode, but only for MAIN_FRAME loads.
948  if (request_->load_flags & LOAD_MAIN_FRAME) {
949    const int response_code = response_.headers->response_code();
950    UMA_HISTOGRAM_ENUMERATION(
951        "Net.HttpResponseCode_Nxx_MainFrame", response_code/100, 10);
952  }
953
954  net_log_.AddEvent(
955      NetLog::TYPE_HTTP_TRANSACTION_READ_RESPONSE_HEADERS,
956      base::Bind(&HttpResponseHeaders::NetLogCallback, response_.headers));
957
958  if (response_.headers->GetParsedHttpVersion() < HttpVersion(1, 0)) {
959    // HTTP/0.9 doesn't support the PUT method, so lack of response headers
960    // indicates a buggy server.  See:
961    // https://bugzilla.mozilla.org/show_bug.cgi?id=193921
962    if (request_->method == "PUT")
963      return ERR_METHOD_NOT_SUPPORTED;
964  }
965
966  // Check for an intermediate 100 Continue response.  An origin server is
967  // allowed to send this response even if we didn't ask for it, so we just
968  // need to skip over it.
969  // We treat any other 1xx in this same way (although in practice getting
970  // a 1xx that isn't a 100 is rare).
971  if (response_.headers->response_code() / 100 == 1) {
972    response_.headers = new HttpResponseHeaders(std::string());
973    next_state_ = STATE_READ_HEADERS;
974    return OK;
975  }
976
977  HostPortPair endpoint = HostPortPair(request_->url.HostNoBrackets(),
978                                       request_->url.EffectiveIntPort());
979  ProcessAlternateProtocol(session_->http_stream_factory(),
980                           session_->http_server_properties(),
981                           *response_.headers.get(),
982                           endpoint);
983
984  int rv = HandleAuthChallenge();
985  if (rv != OK)
986    return rv;
987
988  if (is_https_request())
989    stream_->GetSSLInfo(&response_.ssl_info);
990
991  headers_valid_ = true;
992  return OK;
993}
994
995int HttpNetworkTransaction::DoReadBody() {
996  DCHECK(read_buf_.get());
997  DCHECK_GT(read_buf_len_, 0);
998  DCHECK(stream_ != NULL);
999
1000  next_state_ = STATE_READ_BODY_COMPLETE;
1001  return stream_->ReadResponseBody(
1002      read_buf_.get(), read_buf_len_, io_callback_);
1003}
1004
1005int HttpNetworkTransaction::DoReadBodyComplete(int result) {
1006  // We are done with the Read call.
1007  bool done = false;
1008  if (result <= 0) {
1009    DCHECK_NE(ERR_IO_PENDING, result);
1010    done = true;
1011  }
1012
1013  bool keep_alive = false;
1014  if (stream_->IsResponseBodyComplete()) {
1015    // Note: Just because IsResponseBodyComplete is true, we're not
1016    // necessarily "done".  We're only "done" when it is the last
1017    // read on this HttpNetworkTransaction, which will be signified
1018    // by a zero-length read.
1019    // TODO(mbelshe): The keepalive property is really a property of
1020    //    the stream.  No need to compute it here just to pass back
1021    //    to the stream's Close function.
1022    // TODO(rtenneti): CanFindEndOfResponse should return false if there are no
1023    // ResponseHeaders.
1024    if (stream_->CanFindEndOfResponse()) {
1025      HttpResponseHeaders* headers = GetResponseHeaders();
1026      if (headers)
1027        keep_alive = headers->IsKeepAlive();
1028    }
1029  }
1030
1031  // Clean up connection if we are done.
1032  if (done) {
1033    LogTransactionMetrics();
1034    stream_->Close(!keep_alive);
1035    // Note: we don't reset the stream here.  We've closed it, but we still
1036    // need it around so that callers can call methods such as
1037    // GetUploadProgress() and have them be meaningful.
1038    // TODO(mbelshe): This means we closed the stream here, and we close it
1039    // again in ~HttpNetworkTransaction.  Clean that up.
1040
1041    // The next Read call will return 0 (EOF).
1042  }
1043
1044  // Clear these to avoid leaving around old state.
1045  read_buf_ = NULL;
1046  read_buf_len_ = 0;
1047
1048  return result;
1049}
1050
1051int HttpNetworkTransaction::DoDrainBodyForAuthRestart() {
1052  // This method differs from DoReadBody only in the next_state_.  So we just
1053  // call DoReadBody and override the next_state_.  Perhaps there is a more
1054  // elegant way for these two methods to share code.
1055  int rv = DoReadBody();
1056  DCHECK(next_state_ == STATE_READ_BODY_COMPLETE);
1057  next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE;
1058  return rv;
1059}
1060
1061// TODO(wtc): This method and the DoReadBodyComplete method are almost
1062// the same.  Figure out a good way for these two methods to share code.
1063int HttpNetworkTransaction::DoDrainBodyForAuthRestartComplete(int result) {
1064  // keep_alive defaults to true because the very reason we're draining the
1065  // response body is to reuse the connection for auth restart.
1066  bool done = false, keep_alive = true;
1067  if (result < 0) {
1068    // Error or closed connection while reading the socket.
1069    done = true;
1070    keep_alive = false;
1071  } else if (stream_->IsResponseBodyComplete()) {
1072    done = true;
1073  }
1074
1075  if (done) {
1076    DidDrainBodyForAuthRestart(keep_alive);
1077  } else {
1078    // Keep draining.
1079    next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
1080  }
1081
1082  return OK;
1083}
1084
1085void HttpNetworkTransaction::LogTransactionConnectedMetrics() {
1086  if (logged_response_time_)
1087    return;
1088
1089  logged_response_time_ = true;
1090
1091  base::TimeDelta total_duration = response_.response_time - start_time_;
1092
1093  UMA_HISTOGRAM_CUSTOM_TIMES(
1094      "Net.Transaction_Connected",
1095      total_duration,
1096      base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
1097      100);
1098
1099  bool reused_socket = stream_->IsConnectionReused();
1100  if (!reused_socket) {
1101    UMA_HISTOGRAM_CUSTOM_TIMES(
1102        "Net.Transaction_Connected_New_b",
1103        total_duration,
1104        base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
1105        100);
1106  }
1107
1108  // Currently, non-HIGHEST priority requests are frame or sub-frame resource
1109  // types.  This will change when we also prioritize certain subresources like
1110  // css, js, etc.
1111  if (priority_ != HIGHEST) {
1112    UMA_HISTOGRAM_CUSTOM_TIMES(
1113        "Net.Priority_High_Latency_b",
1114        total_duration,
1115        base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
1116        100);
1117  } else {
1118    UMA_HISTOGRAM_CUSTOM_TIMES(
1119        "Net.Priority_Low_Latency_b",
1120        total_duration,
1121        base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromMinutes(10),
1122        100);
1123  }
1124}
1125
1126void HttpNetworkTransaction::LogTransactionMetrics() const {
1127  base::TimeDelta duration = base::Time::Now() -
1128                             response_.request_time;
1129  if (60 < duration.InMinutes())
1130    return;
1131
1132  base::TimeDelta total_duration = base::Time::Now() - start_time_;
1133
1134  UMA_HISTOGRAM_CUSTOM_TIMES("Net.Transaction_Latency_b", duration,
1135                             base::TimeDelta::FromMilliseconds(1),
1136                             base::TimeDelta::FromMinutes(10),
1137                             100);
1138  UMA_HISTOGRAM_CUSTOM_TIMES("Net.Transaction_Latency_Total",
1139                             total_duration,
1140                             base::TimeDelta::FromMilliseconds(1),
1141                             base::TimeDelta::FromMinutes(10), 100);
1142
1143  if (!stream_->IsConnectionReused()) {
1144    UMA_HISTOGRAM_CUSTOM_TIMES(
1145        "Net.Transaction_Latency_Total_New_Connection",
1146        total_duration, base::TimeDelta::FromMilliseconds(1),
1147        base::TimeDelta::FromMinutes(10), 100);
1148  }
1149}
1150
1151int HttpNetworkTransaction::HandleCertificateRequest(int error) {
1152  // There are two paths through which the server can request a certificate
1153  // from us.  The first is during the initial handshake, the second is
1154  // during SSL renegotiation.
1155  //
1156  // In both cases, we want to close the connection before proceeding.
1157  // We do this for two reasons:
1158  //   First, we don't want to keep the connection to the server hung for a
1159  //   long time while the user selects a certificate.
1160  //   Second, even if we did keep the connection open, NSS has a bug where
1161  //   restarting the handshake for ClientAuth is currently broken.
1162  DCHECK_EQ(error, ERR_SSL_CLIENT_AUTH_CERT_NEEDED);
1163
1164  if (stream_.get()) {
1165    // Since we already have a stream, we're being called as part of SSL
1166    // renegotiation.
1167    DCHECK(!stream_request_.get());
1168    stream_->Close(true);
1169    stream_.reset();
1170  }
1171
1172  // The server is asking for a client certificate during the initial
1173  // handshake.
1174  stream_request_.reset();
1175
1176  // If the user selected one of the certificates in client_certs or declined
1177  // to provide one for this server before, use the past decision
1178  // automatically.
1179  scoped_refptr<X509Certificate> client_cert;
1180  bool found_cached_cert = session_->ssl_client_auth_cache()->Lookup(
1181      response_.cert_request_info->host_and_port, &client_cert);
1182  if (!found_cached_cert)
1183    return error;
1184
1185  // Check that the certificate selected is still a certificate the server
1186  // is likely to accept, based on the criteria supplied in the
1187  // CertificateRequest message.
1188  if (client_cert.get()) {
1189    const std::vector<std::string>& cert_authorities =
1190        response_.cert_request_info->cert_authorities;
1191
1192    bool cert_still_valid = cert_authorities.empty() ||
1193        client_cert->IsIssuedByEncoded(cert_authorities);
1194    if (!cert_still_valid)
1195      return error;
1196  }
1197
1198  // TODO(davidben): Add a unit test which covers this path; we need to be
1199  // able to send a legitimate certificate and also bypass/clear the
1200  // SSL session cache.
1201  SSLConfig* ssl_config = response_.cert_request_info->is_proxy ?
1202      &proxy_ssl_config_ : &server_ssl_config_;
1203  ssl_config->send_client_cert = true;
1204  ssl_config->client_cert = client_cert;
1205  next_state_ = STATE_CREATE_STREAM;
1206  // Reset the other member variables.
1207  // Note: this is necessary only with SSL renegotiation.
1208  ResetStateForRestart();
1209  return OK;
1210}
1211
1212// TODO(rch): This does not correctly handle errors when an SSL proxy is
1213// being used, as all of the errors are handled as if they were generated
1214// by the endpoint host, request_->url, rather than considering if they were
1215// generated by the SSL proxy. http://crbug.com/69329
1216int HttpNetworkTransaction::HandleSSLHandshakeError(int error) {
1217  DCHECK(request_);
1218  if (server_ssl_config_.send_client_cert &&
1219      (error == ERR_SSL_PROTOCOL_ERROR || IsClientCertificateError(error))) {
1220    session_->ssl_client_auth_cache()->Remove(
1221        GetHostAndPort(request_->url));
1222  }
1223
1224  bool should_fallback = false;
1225  uint16 version_max = server_ssl_config_.version_max;
1226
1227  switch (error) {
1228    case ERR_SSL_PROTOCOL_ERROR:
1229    case ERR_SSL_VERSION_OR_CIPHER_MISMATCH:
1230      if (version_max >= SSL_PROTOCOL_VERSION_TLS1 &&
1231          version_max > server_ssl_config_.version_min) {
1232        // This could be a TLS-intolerant server or a server that chose a
1233        // cipher suite defined only for higher protocol versions (such as
1234        // an SSL 3.0 server that chose a TLS-only cipher suite).  Fall
1235        // back to the next lower version and retry.
1236        // NOTE: if the SSLClientSocket class doesn't support TLS 1.1,
1237        // specifying TLS 1.1 in version_max will result in a TLS 1.0
1238        // handshake, so falling back from TLS 1.1 to TLS 1.0 will simply
1239        // repeat the TLS 1.0 handshake. To avoid this problem, the default
1240        // version_max should match the maximum protocol version supported
1241        // by the SSLClientSocket class.
1242        version_max--;
1243
1244        // Fallback to the lower SSL version.
1245        // While SSL 3.0 fallback should be eliminated because of security
1246        // reasons, there is a high risk of breaking the servers if this is
1247        // done in general.
1248        // For now SSL 3.0 fallback is disabled for Google servers first,
1249        // and will be expanded to other servers after enough experiences
1250        // have been gained showing that this experiment works well with
1251        // today's Internet.
1252        if (version_max > SSL_PROTOCOL_VERSION_SSL3 ||
1253            (server_ssl_config_.unrestricted_ssl3_fallback_enabled ||
1254             !TransportSecurityState::IsGooglePinnedProperty(
1255                 request_->url.host(), true /* include SNI */))) {
1256          should_fallback = true;
1257        }
1258      }
1259      break;
1260    case ERR_SSL_BAD_RECORD_MAC_ALERT:
1261      if (version_max >= SSL_PROTOCOL_VERSION_TLS1_1 &&
1262          version_max > server_ssl_config_.version_min) {
1263        // Some broken SSL devices negotiate TLS 1.0 when sent a TLS 1.1 or
1264        // 1.2 ClientHello, but then return a bad_record_mac alert. See
1265        // crbug.com/260358. In order to make the fallback as minimal as
1266        // possible, this fallback is only triggered for >= TLS 1.1.
1267        version_max--;
1268        should_fallback = true;
1269      }
1270      break;
1271  }
1272
1273  if (should_fallback) {
1274    net_log_.AddEvent(
1275        NetLog::TYPE_SSL_VERSION_FALLBACK,
1276        base::Bind(&NetLogSSLVersionFallbackCallback,
1277                   &request_->url, error, server_ssl_config_.version_max,
1278                   version_max));
1279    server_ssl_config_.version_max = version_max;
1280    server_ssl_config_.version_fallback = true;
1281    ResetConnectionAndRequestForResend();
1282    error = OK;
1283  }
1284
1285  return error;
1286}
1287
1288// This method determines whether it is safe to resend the request after an
1289// IO error.  It can only be called in response to request header or body
1290// write errors or response header read errors.  It should not be used in
1291// other cases, such as a Connect error.
1292int HttpNetworkTransaction::HandleIOError(int error) {
1293  // SSL errors may happen at any time during the stream and indicate issues
1294  // with the underlying connection. Because the peer may request
1295  // renegotiation at any time, check and handle any possible SSL handshake
1296  // related errors. In addition to renegotiation, TLS False Start may cause
1297  // SSL handshake errors (specifically servers with buggy DEFLATE support)
1298  // to be delayed until the first Read on the underlying connection.
1299  error = HandleSSLHandshakeError(error);
1300
1301  switch (error) {
1302    // If we try to reuse a connection that the server is in the process of
1303    // closing, we may end up successfully writing out our request (or a
1304    // portion of our request) only to find a connection error when we try to
1305    // read from (or finish writing to) the socket.
1306    case ERR_CONNECTION_RESET:
1307    case ERR_CONNECTION_CLOSED:
1308    case ERR_CONNECTION_ABORTED:
1309    // There can be a race between the socket pool checking checking whether a
1310    // socket is still connected, receiving the FIN, and sending/reading data
1311    // on a reused socket.  If we receive the FIN between the connectedness
1312    // check and writing/reading from the socket, we may first learn the socket
1313    // is disconnected when we get a ERR_SOCKET_NOT_CONNECTED.  This will most
1314    // likely happen when trying to retrieve its IP address.
1315    // See http://crbug.com/105824 for more details.
1316    case ERR_SOCKET_NOT_CONNECTED:
1317      if (ShouldResendRequest(error)) {
1318        net_log_.AddEventWithNetErrorCode(
1319            NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR, error);
1320        ResetConnectionAndRequestForResend();
1321        error = OK;
1322      }
1323      break;
1324    case ERR_PIPELINE_EVICTION:
1325      if (!session_->force_http_pipelining()) {
1326        net_log_.AddEventWithNetErrorCode(
1327            NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR, error);
1328        ResetConnectionAndRequestForResend();
1329        error = OK;
1330      }
1331      break;
1332    case ERR_SPDY_PING_FAILED:
1333    case ERR_SPDY_SERVER_REFUSED_STREAM:
1334      net_log_.AddEventWithNetErrorCode(
1335          NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR, error);
1336      ResetConnectionAndRequestForResend();
1337      error = OK;
1338      break;
1339  }
1340  return error;
1341}
1342
1343void HttpNetworkTransaction::ResetStateForRestart() {
1344  ResetStateForAuthRestart();
1345  stream_.reset();
1346}
1347
1348void HttpNetworkTransaction::ResetStateForAuthRestart() {
1349  send_start_time_ = base::TimeTicks();
1350  send_end_time_ = base::TimeTicks();
1351
1352  pending_auth_target_ = HttpAuth::AUTH_NONE;
1353  read_buf_ = NULL;
1354  read_buf_len_ = 0;
1355  headers_valid_ = false;
1356  request_headers_.Clear();
1357  response_ = HttpResponseInfo();
1358  establishing_tunnel_ = false;
1359}
1360
1361HttpResponseHeaders* HttpNetworkTransaction::GetResponseHeaders() const {
1362  return response_.headers.get();
1363}
1364
1365bool HttpNetworkTransaction::ShouldResendRequest(int error) const {
1366  bool connection_is_proven = stream_->IsConnectionReused();
1367  bool has_received_headers = GetResponseHeaders() != NULL;
1368
1369  // NOTE: we resend a request only if we reused a keep-alive connection.
1370  // This automatically prevents an infinite resend loop because we'll run
1371  // out of the cached keep-alive connections eventually.
1372  if (connection_is_proven && !has_received_headers)
1373    return true;
1374  return false;
1375}
1376
1377void HttpNetworkTransaction::ResetConnectionAndRequestForResend() {
1378  if (stream_.get()) {
1379    stream_->Close(true);
1380    stream_.reset();
1381  }
1382
1383  // We need to clear request_headers_ because it contains the real request
1384  // headers, but we may need to resend the CONNECT request first to recreate
1385  // the SSL tunnel.
1386  request_headers_.Clear();
1387  next_state_ = STATE_CREATE_STREAM;  // Resend the request.
1388}
1389
1390bool HttpNetworkTransaction::ShouldApplyProxyAuth() const {
1391  return !is_https_request() &&
1392      (proxy_info_.is_https() || proxy_info_.is_http());
1393}
1394
1395bool HttpNetworkTransaction::ShouldApplyServerAuth() const {
1396  return !(request_->load_flags & LOAD_DO_NOT_SEND_AUTH_DATA);
1397}
1398
1399int HttpNetworkTransaction::HandleAuthChallenge() {
1400  scoped_refptr<HttpResponseHeaders> headers(GetResponseHeaders());
1401  DCHECK(headers.get());
1402
1403  int status = headers->response_code();
1404  if (status != HTTP_UNAUTHORIZED &&
1405      status != HTTP_PROXY_AUTHENTICATION_REQUIRED)
1406    return OK;
1407  HttpAuth::Target target = status == HTTP_PROXY_AUTHENTICATION_REQUIRED ?
1408                            HttpAuth::AUTH_PROXY : HttpAuth::AUTH_SERVER;
1409  if (target == HttpAuth::AUTH_PROXY && proxy_info_.is_direct())
1410    return ERR_UNEXPECTED_PROXY_AUTH;
1411
1412  // This case can trigger when an HTTPS server responds with a "Proxy
1413  // authentication required" status code through a non-authenticating
1414  // proxy.
1415  if (!auth_controllers_[target].get())
1416    return ERR_UNEXPECTED_PROXY_AUTH;
1417
1418  int rv = auth_controllers_[target]->HandleAuthChallenge(
1419      headers, (request_->load_flags & LOAD_DO_NOT_SEND_AUTH_DATA) != 0, false,
1420      net_log_);
1421  if (auth_controllers_[target]->HaveAuthHandler())
1422      pending_auth_target_ = target;
1423
1424  scoped_refptr<AuthChallengeInfo> auth_info =
1425      auth_controllers_[target]->auth_info();
1426  if (auth_info.get())
1427      response_.auth_challenge = auth_info;
1428
1429  return rv;
1430}
1431
1432bool HttpNetworkTransaction::HaveAuth(HttpAuth::Target target) const {
1433  return auth_controllers_[target].get() &&
1434      auth_controllers_[target]->HaveAuth();
1435}
1436
1437GURL HttpNetworkTransaction::AuthURL(HttpAuth::Target target) const {
1438  switch (target) {
1439    case HttpAuth::AUTH_PROXY: {
1440      if (!proxy_info_.proxy_server().is_valid() ||
1441          proxy_info_.proxy_server().is_direct()) {
1442        return GURL();  // There is no proxy server.
1443      }
1444      const char* scheme = proxy_info_.is_https() ? "https://" : "http://";
1445      return GURL(scheme +
1446                  proxy_info_.proxy_server().host_port_pair().ToString());
1447    }
1448    case HttpAuth::AUTH_SERVER:
1449      return request_->url;
1450    default:
1451     return GURL();
1452  }
1453}
1454
1455#define STATE_CASE(s) \
1456  case s: \
1457    description = base::StringPrintf("%s (0x%08X)", #s, s); \
1458    break
1459
1460std::string HttpNetworkTransaction::DescribeState(State state) {
1461  std::string description;
1462  switch (state) {
1463    STATE_CASE(STATE_CREATE_STREAM);
1464    STATE_CASE(STATE_CREATE_STREAM_COMPLETE);
1465    STATE_CASE(STATE_INIT_REQUEST_BODY);
1466    STATE_CASE(STATE_INIT_REQUEST_BODY_COMPLETE);
1467    STATE_CASE(STATE_BUILD_REQUEST);
1468    STATE_CASE(STATE_BUILD_REQUEST_COMPLETE);
1469    STATE_CASE(STATE_SEND_REQUEST);
1470    STATE_CASE(STATE_SEND_REQUEST_COMPLETE);
1471    STATE_CASE(STATE_READ_HEADERS);
1472    STATE_CASE(STATE_READ_HEADERS_COMPLETE);
1473    STATE_CASE(STATE_READ_BODY);
1474    STATE_CASE(STATE_READ_BODY_COMPLETE);
1475    STATE_CASE(STATE_DRAIN_BODY_FOR_AUTH_RESTART);
1476    STATE_CASE(STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE);
1477    STATE_CASE(STATE_NONE);
1478    default:
1479      description = base::StringPrintf("Unknown state 0x%08X (%u)", state,
1480                                       state);
1481      break;
1482  }
1483  return description;
1484}
1485
1486#undef STATE_CASE
1487
1488}  // namespace net
1489