net/proxy/proxy_resolver_winhttp.cc

   1 // Copyright (c) 2011 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/proxy/proxy_resolver_winhttp.h"
   6
   7 #include <windows.h>
   8 #include <winhttp.h>
   9
  10 #include "base/metrics/histogram.h"
  11 #include "base/strings/string_util.h"
  12 #include "base/strings/utf_string_conversions.h"
  13 #include "net/base/net_errors.h"
  14 #include "net/proxy/proxy_info.h"
  15 #include "url/gurl.h"
  16
  17 #pragma comment(lib, "winhttp.lib")
  18
  19 using base::TimeDelta;
  20 using base::TimeTicks;
  21
  22 namespace net {
  23
  24 static void FreeInfo(WINHTTP_PROXY_INFO* info) {
  25   if (info->lpszProxy)
  26     GlobalFree(info->lpszProxy);
  27   if (info->lpszProxyBypass)
  28     GlobalFree(info->lpszProxyBypass);
  29 }
  30
  31 ProxyResolverWinHttp::ProxyResolverWinHttp()
  32     : ProxyResolver(false /*expects_pac_bytes*/), session_handle_(NULL) {
  33 }
  34
  35 ProxyResolverWinHttp::~ProxyResolverWinHttp() {
  36   CloseWinHttpSession();
  37 }
  38
  39 int ProxyResolverWinHttp::GetProxyForURL(const GURL& query_url,
  40                                          ProxyInfo* results,
  41                                          const CompletionCallback& /*callback*/,
  42                                          RequestHandle* /*request*/,
  43                                          const BoundNetLog& /*net_log*/) {
  44   // If we don't have a WinHTTP session, then create a new one.
  45   if (!session_handle_ && !OpenWinHttpSession())
  46     return ERR_FAILED;
  47
  48   // If we have been given an empty PAC url, then use auto-detection.
  49   //
  50   // NOTE: We just use DNS-based auto-detection here like Firefox.  We do this
  51   // to avoid WinHTTP's auto-detection code, which while more featureful (it
  52   // supports DHCP based auto-detection) also appears to have issues.
  53   //
  54   WINHTTP_AUTOPROXY_OPTIONS options = {0};
  55   options.fAutoLogonIfChallenged = FALSE;
  56   options.dwFlags = WINHTTP_AUTOPROXY_CONFIG_URL;
  57   base::string16 pac_url16 = base::ASCIIToUTF16(pac_url_.spec());
  58   options.lpszAutoConfigUrl = pac_url16.c_str();
  59
  60   WINHTTP_PROXY_INFO info = {0};
  61   DCHECK(session_handle_);
  62
  63   // Per http://msdn.microsoft.com/en-us/library/aa383153(VS.85).aspx, it is
  64   // necessary to first try resolving with fAutoLogonIfChallenged set to false.
  65   // Otherwise, we fail over to trying it with a value of true.  This way we
  66   // get good performance in the case where WinHTTP uses an out-of-process
  67   // resolver.  This is important for Vista and Win2k3.
  68   BOOL ok = WinHttpGetProxyForUrl(session_handle_,
  69                                   base::ASCIIToUTF16(query_url.spec()).c_str(),
  70                                   &options, &info);
  71   if (!ok) {
  72     if (ERROR_WINHTTP_LOGIN_FAILURE == GetLastError()) {
  73       options.fAutoLogonIfChallenged = TRUE;
  74       ok = WinHttpGetProxyForUrl(
  75           session_handle_, base::ASCIIToUTF16(query_url.spec()).c_str(),
  76           &options, &info);
  77     }
  78     if (!ok) {
  79       DWORD error = GetLastError();
  80       // If we got here because of RPC timeout during out of process PAC
  81       // resolution, no further requests on this session are going to work.
  82       if (ERROR_WINHTTP_TIMEOUT == error ||
  83           ERROR_WINHTTP_AUTO_PROXY_SERVICE_ERROR == error) {
  84         CloseWinHttpSession();
  85       }
  86       return ERR_FAILED;  // TODO(darin): Bug 1189288: translate error code.
  87     }
  88   }
  89
  90   int rv = OK;
  91
  92   switch (info.dwAccessType) {
  93     case WINHTTP_ACCESS_TYPE_NO_PROXY:
  94       results->UseDirect();
  95       break;
  96     case WINHTTP_ACCESS_TYPE_NAMED_PROXY:
  97       // According to MSDN:
  98       //
  99       // The proxy server list contains one or more of the following strings
 100       // separated by semicolons or whitespace.
 101       //
 102       // ([<scheme>=][<scheme>"://"]<server>[":"<port>])
 103       //
 104       // Based on this description, ProxyInfo::UseNamedProxy() isn't
 105       // going to handle all the variations (in particular <scheme>=).
 106       //
 107       // However in practice, it seems that WinHTTP is simply returning
 108       // things like "foopy1:80;foopy2:80". It strips out the non-HTTP
 109       // proxy types, and stops the list when PAC encounters a "DIRECT".
 110       // So UseNamedProxy() should work OK.
 111       results->UseNamedProxy(base::UTF16ToASCII(info.lpszProxy));
 112       break;
 113     default:
 114       NOTREACHED();
 115       rv = ERR_FAILED;
 116   }
 117
 118   FreeInfo(&info);
 119   return rv;
 120 }
 121
 122 void ProxyResolverWinHttp::CancelRequest(RequestHandle request) {
 123   // This is a synchronous ProxyResolver; no possibility for async requests.
 124   NOTREACHED();
 125 }
 126
 127 LoadState ProxyResolverWinHttp::GetLoadState(RequestHandle request) const {
 128   NOTREACHED();
 129   return LOAD_STATE_IDLE;
 130 }
 131
 132 void ProxyResolverWinHttp::CancelSetPacScript() {
 133   NOTREACHED();
 134 }
 135
 136 int ProxyResolverWinHttp::SetPacScript(
 137     const scoped_refptr<ProxyResolverScriptData>& script_data,
 138     const CompletionCallback& /*callback*/) {
 139   if (script_data->type() == ProxyResolverScriptData::TYPE_AUTO_DETECT) {
 140     pac_url_ = GURL("http://wpad/wpad.dat");
 141   } else {
 142     pac_url_ = script_data->url();
 143   }
 144   return OK;
 145 }
 146
 147 bool ProxyResolverWinHttp::OpenWinHttpSession() {
 148   DCHECK(!session_handle_);
 149   session_handle_ = WinHttpOpen(NULL,
 150                                 WINHTTP_ACCESS_TYPE_NO_PROXY,
 151                                 WINHTTP_NO_PROXY_NAME,
 152                                 WINHTTP_NO_PROXY_BYPASS,
 153                                 0);
 154   if (!session_handle_)
 155     return false;
 156
 157   // Since this session handle will never be used for WinHTTP connections,
 158   // these timeouts don't really mean much individually.  However, WinHTTP's
 159   // out of process PAC resolution will use a combined (sum of all timeouts)
 160   // value to wait for an RPC reply.
 161   BOOL rv = WinHttpSetTimeouts(session_handle_, 10000, 10000, 5000, 5000);
 162   DCHECK(rv);
 163
 164   return true;
 165 }
 166
 167 void ProxyResolverWinHttp::CloseWinHttpSession() {
 168   if (session_handle_) {
 169     WinHttpCloseHandle(session_handle_);
 170     session_handle_ = NULL;
 171   }
 172 }
 173
 174 }  // namespace net