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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/proxy/proxy_resolver_winhttp.h"
#include <windows.h>
#include <winhttp.h>
#include "base/histogram.h"
#include "base/string_tokenizer.h"
#include "net/base/net_errors.h"
#pragma comment(lib, "winhttp.lib")
using base::TimeDelta;
using base::TimeTicks;
namespace net {
// A small wrapper for histogramming purposes ;-)
static BOOL CallWinHttpGetProxyForUrl(HINTERNET session, LPCWSTR url,
WINHTTP_AUTOPROXY_OPTIONS* options,
WINHTTP_PROXY_INFO* results) {
TimeTicks time_start = TimeTicks::Now();
BOOL rv = WinHttpGetProxyForUrl(session, url, options, results);
TimeDelta time_delta = TimeTicks::Now() - time_start;
// Record separately success and failure times since they will have very
// different characteristics.
if (rv) {
UMA_HISTOGRAM_LONG_TIMES(L"Net.GetProxyForUrl_OK", time_delta);
} else {
UMA_HISTOGRAM_LONG_TIMES(L"Net.GetProxyForUrl_FAIL", time_delta);
}
return rv;
}
static void FreeConfig(WINHTTP_CURRENT_USER_IE_PROXY_CONFIG* config) {
if (config->lpszAutoConfigUrl)
GlobalFree(config->lpszAutoConfigUrl);
if (config->lpszProxy)
GlobalFree(config->lpszProxy);
if (config->lpszProxyBypass)
GlobalFree(config->lpszProxyBypass);
}
static void FreeInfo(WINHTTP_PROXY_INFO* info) {
if (info->lpszProxy)
GlobalFree(info->lpszProxy);
if (info->lpszProxyBypass)
GlobalFree(info->lpszProxyBypass);
}
ProxyResolverWinHttp::ProxyResolverWinHttp()
: session_handle_(NULL) {
}
ProxyResolverWinHttp::~ProxyResolverWinHttp() {
CloseWinHttpSession();
}
int ProxyResolverWinHttp::GetProxyConfig(ProxyConfig* config) {
WINHTTP_CURRENT_USER_IE_PROXY_CONFIG ie_config = {0};
if (!WinHttpGetIEProxyConfigForCurrentUser(&ie_config)) {
LOG(ERROR) << "WinHttpGetIEProxyConfigForCurrentUser failed: " <<
GetLastError();
return ERR_FAILED; // TODO(darin): Bug 1189288: translate error code.
}
if (ie_config.fAutoDetect)
config->auto_detect = true;
if (ie_config.lpszProxy)
config->proxy_server = WideToASCII(ie_config.lpszProxy);
if (ie_config.lpszProxyBypass) {
std::string proxy_bypass = WideToASCII(ie_config.lpszProxyBypass);
StringTokenizer proxy_server_bypass_list(proxy_bypass, "; \t\n\r");
while (proxy_server_bypass_list.GetNext()) {
std::string bypass_url_domain = proxy_server_bypass_list.token();
if (bypass_url_domain == "<local>")
config->proxy_bypass_local_names = true;
else
config->proxy_bypass.push_back(bypass_url_domain);
}
}
if (ie_config.lpszAutoConfigUrl)
config->pac_url = GURL(ie_config.lpszAutoConfigUrl);
FreeConfig(&ie_config);
return OK;
}
int ProxyResolverWinHttp::GetProxyForURL(const GURL& query_url,
const GURL& pac_url,
ProxyInfo* results) {
// If we don't have a WinHTTP session, then create a new one.
if (!session_handle_ && !OpenWinHttpSession())
return ERR_FAILED;
// If we have been given an empty PAC url, then use auto-detection.
//
// NOTE: We just use DNS-based auto-detection here like Firefox. We do this
// to avoid WinHTTP's auto-detection code, which while more featureful (it
// supports DHCP based auto-detection) also appears to have issues.
//
WINHTTP_AUTOPROXY_OPTIONS options = {0};
options.fAutoLogonIfChallenged = FALSE;
options.dwFlags = WINHTTP_AUTOPROXY_CONFIG_URL;
std::wstring pac_url_wide = ASCIIToWide(pac_url.spec());
options.lpszAutoConfigUrl =
pac_url_wide.empty() ? L"http://wpad/wpad.dat" : pac_url_wide.c_str();
WINHTTP_PROXY_INFO info = {0};
DCHECK(session_handle_);
// Per http://msdn.microsoft.com/en-us/library/aa383153(VS.85).aspx, it is
// necessary to first try resolving with fAutoLogonIfChallenged set to false.
// Otherwise, we fail over to trying it with a value of true. This way we
// get good performance in the case where WinHTTP uses an out-of-process
// resolver. This is important for Vista and Win2k3.
BOOL ok = CallWinHttpGetProxyForUrl(
session_handle_, ASCIIToWide(query_url.spec()).c_str(), &options, &info);
if (!ok) {
if (ERROR_WINHTTP_LOGIN_FAILURE == GetLastError()) {
options.fAutoLogonIfChallenged = TRUE;
ok = CallWinHttpGetProxyForUrl(
session_handle_, ASCIIToWide(query_url.spec()).c_str(),
&options, &info);
}
if (!ok) {
DWORD error = GetLastError();
LOG(ERROR) << "WinHttpGetProxyForUrl failed: " << error;
// If we got here because of RPC timeout during out of process PAC
// resolution, no further requests on this session are going to work.
if (ERROR_WINHTTP_TIMEOUT == error ||
ERROR_WINHTTP_AUTO_PROXY_SERVICE_ERROR == error) {
CloseWinHttpSession();
}
return ERR_FAILED; // TODO(darin): Bug 1189288: translate error code.
}
}
int rv = OK;
switch (info.dwAccessType) {
case WINHTTP_ACCESS_TYPE_NO_PROXY:
results->UseDirect();
break;
case WINHTTP_ACCESS_TYPE_NAMED_PROXY:
results->UseNamedProxy(WideToASCII(info.lpszProxy));
break;
default:
NOTREACHED();
rv = ERR_FAILED;
}
FreeInfo(&info);
return rv;
}
bool ProxyResolverWinHttp::OpenWinHttpSession() {
DCHECK(!session_handle_);
session_handle_ = WinHttpOpen(NULL,
WINHTTP_ACCESS_TYPE_NO_PROXY,
WINHTTP_NO_PROXY_NAME,
WINHTTP_NO_PROXY_BYPASS,
0);
if (!session_handle_)
return false;
// Since this session handle will never be used for WinHTTP connections,
// these timeouts don't really mean much individually. However, WinHTTP's
// out of process PAC resolution will use a combined (sum of all timeouts)
// value to wait for an RPC reply.
BOOL rv = WinHttpSetTimeouts(session_handle_, 10000, 10000, 5000, 5000);
DCHECK(rv);
return true;
}
void ProxyResolverWinHttp::CloseWinHttpSession() {
if (session_handle_) {
WinHttpCloseHandle(session_handle_);
session_handle_ = NULL;
}
}
} // namespace net
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