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// Copyright (c) 2012 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 "chrome_frame/bho.h"
#include <shlguid.h>
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/time/time.h"
#include "base/win/scoped_bstr.h"
#include "chrome_frame/buggy_bho_handling.h"
#include "chrome_frame/crash_reporting/crash_metrics.h"
#include "chrome_frame/extra_system_apis.h"
#include "chrome_frame/html_utils.h"
#include "chrome_frame/http_negotiate.h"
#include "chrome_frame/metrics_service.h"
#include "chrome_frame/protocol_sink_wrap.h"
#include "chrome_frame/turndown_prompt/turndown_prompt.h"
#include "chrome_frame/urlmon_moniker.h"
#include "chrome_frame/utils.h"
#include "chrome_frame/vtable_patch_manager.h"
static const int kIBrowserServiceOnHttpEquivIndex = 30;
static const DWORD kMaxHttpConnections = 6;
PatchHelper g_patch_helper;
BEGIN_VTABLE_PATCHES(IBrowserService)
VTABLE_PATCH_ENTRY(kIBrowserServiceOnHttpEquivIndex, Bho::OnHttpEquiv)
END_VTABLE_PATCHES()
_ATL_FUNC_INFO Bho::kBeforeNavigate2Info = {
CC_STDCALL, VT_EMPTY, 7, {
VT_DISPATCH,
VT_VARIANT | VT_BYREF,
VT_VARIANT | VT_BYREF,
VT_VARIANT | VT_BYREF,
VT_VARIANT | VT_BYREF,
VT_VARIANT | VT_BYREF,
VT_BOOL | VT_BYREF
}
};
_ATL_FUNC_INFO Bho::kNavigateComplete2Info = {
CC_STDCALL, VT_EMPTY, 2, {
VT_DISPATCH,
VT_VARIANT | VT_BYREF
}
};
_ATL_FUNC_INFO Bho::kDocumentCompleteInfo = {
CC_STDCALL, VT_EMPTY, 2, {
VT_DISPATCH,
VT_VARIANT | VT_BYREF
}
};
Bho::Bho() {
}
HRESULT Bho::FinalConstruct() {
return S_OK;
}
void Bho::FinalRelease() {
}
STDMETHODIMP Bho::SetSite(IUnknown* site) {
HRESULT hr = S_OK;
if (site) {
base::TimeTicks start = base::TimeTicks::Now();
base::win::ScopedComPtr<IWebBrowser2> web_browser2;
web_browser2.QueryFrom(site);
if (web_browser2) {
hr = DispEventAdvise(web_browser2, &DIID_DWebBrowserEvents2);
DCHECK(SUCCEEDED(hr)) << "DispEventAdvise failed. Error: " << hr;
turndown_prompt::Configure(web_browser2);
}
if (g_patch_helper.state() == PatchHelper::PATCH_IBROWSER) {
base::win::ScopedComPtr<IBrowserService> browser_service;
hr = DoQueryService(SID_SShellBrowser, site, browser_service.Receive());
DCHECK(browser_service) << "DoQueryService - SID_SShellBrowser failed."
<< " Site: " << site << " Error: " << hr;
if (browser_service) {
g_patch_helper.PatchBrowserService(browser_service);
DCHECK(SUCCEEDED(hr)) << "vtable_patch::PatchInterfaceMethods failed."
<< " Site: " << site << " Error: " << hr;
}
}
// Save away our BHO instance in TLS which enables it to be referenced by
// our active document/activex instances to query referrer and other
// information for a URL.
AddRef();
RegisterThreadInstance();
MetricsService::Start();
if (!IncreaseWinInetConnections(kMaxHttpConnections)) {
DLOG(WARNING) << "Failed to bump up HTTP connections. Error:"
<< ::GetLastError();
}
base::TimeDelta delta = base::TimeTicks::Now() - start;
UMA_HISTOGRAM_TIMES("ChromeFrame.BhoLoadSetSite", delta);
} else {
UnregisterThreadInstance();
buggy_bho::BuggyBhoTls::DestroyInstance();
base::win::ScopedComPtr<IWebBrowser2> web_browser2;
web_browser2.QueryFrom(m_spUnkSite);
DispEventUnadvise(web_browser2, &DIID_DWebBrowserEvents2);
Release();
}
return IObjectWithSiteImpl<Bho>::SetSite(site);
}
STDMETHODIMP Bho::BeforeNavigate2(IDispatch* dispatch, VARIANT* url,
VARIANT* flags, VARIANT* target_frame_name, VARIANT* post_data,
VARIANT* headers, VARIANT_BOOL* cancel) {
if (!url || url->vt != VT_BSTR || url->bstrVal == NULL) {
DLOG(WARNING) << "Invalid URL passed in";
return S_OK;
}
base::win::ScopedComPtr<IWebBrowser2> web_browser2;
if (dispatch)
web_browser2.QueryFrom(dispatch);
if (!web_browser2) {
NOTREACHED() << "Can't find WebBrowser2 with given dispatch";
return S_OK;
}
DVLOG(1) << "BeforeNavigate2: " << url->bstrVal;
base::win::ScopedComPtr<IBrowserService> browser_service;
DoQueryService(SID_SShellBrowser, web_browser2, browser_service.Receive());
if (!browser_service || !CheckForCFNavigation(browser_service, false)) {
// TODO(tommi): Remove? Isn't this done below by calling set_referrer("")?
referrer_.clear();
}
VARIANT_BOOL is_top_level = VARIANT_FALSE;
web_browser2->get_TopLevelContainer(&is_top_level);
if (is_top_level) {
set_url(url->bstrVal);
set_referrer("");
set_post_data(post_data);
set_headers(headers);
}
return S_OK;
}
STDMETHODIMP_(void) Bho::NavigateComplete2(IDispatch* dispatch, VARIANT* url) {
DVLOG(1) << __FUNCTION__;
}
STDMETHODIMP_(void) Bho::DocumentComplete(IDispatch* dispatch, VARIANT* url) {
DVLOG(1) << __FUNCTION__;
base::win::ScopedComPtr<IWebBrowser2> web_browser2;
if (dispatch)
web_browser2.QueryFrom(dispatch);
if (web_browser2) {
VARIANT_BOOL is_top_level = VARIANT_FALSE;
web_browser2->get_TopLevelContainer(&is_top_level);
if (is_top_level) {
CrashMetricsReporter::GetInstance()->IncrementMetric(
CrashMetricsReporter::NAVIGATION_COUNT);
}
}
}
namespace {
// See comments in Bho::OnHttpEquiv for details.
void ClearDocumentContents(IUnknown* browser) {
base::win::ScopedComPtr<IWebBrowser2> web_browser2;
if (SUCCEEDED(DoQueryService(SID_SWebBrowserApp, browser,
web_browser2.Receive()))) {
base::win::ScopedComPtr<IDispatch> doc_disp;
web_browser2->get_Document(doc_disp.Receive());
base::win::ScopedComPtr<IHTMLDocument2> doc;
if (doc_disp && SUCCEEDED(doc.QueryFrom(doc_disp))) {
SAFEARRAY* sa = ::SafeArrayCreateVector(VT_UI1, 0, 0);
doc->write(sa);
::SafeArrayDestroy(sa);
}
}
}
// Returns true if the currently loaded document in the browser has
// any embedded items such as a frame or an iframe.
bool DocumentHasEmbeddedItems(IUnknown* browser) {
bool has_embedded_items = false;
base::win::ScopedComPtr<IWebBrowser2> web_browser2;
base::win::ScopedComPtr<IDispatch> document;
if (SUCCEEDED(DoQueryService(SID_SWebBrowserApp, browser,
web_browser2.Receive())) &&
SUCCEEDED(web_browser2->get_Document(document.Receive()))) {
base::win::ScopedComPtr<IOleContainer> container;
if (SUCCEEDED(container.QueryFrom(document))) {
base::win::ScopedComPtr<IEnumUnknown> enumerator;
container->EnumObjects(OLECONTF_EMBEDDINGS, enumerator.Receive());
if (enumerator) {
base::win::ScopedComPtr<IUnknown> unk;
DWORD fetched = 0;
while (!has_embedded_items &&
SUCCEEDED(enumerator->Next(1, unk.Receive(), &fetched))
&& fetched) {
// If a top level document has embedded iframes then the theory is
// that first the top level document finishes loading and then the
// iframes load. We should only treat an embedded element as an
// iframe if it supports the IWebBrowser interface.
base::win::ScopedComPtr<IWebBrowser2> embedded_web_browser2;
if (SUCCEEDED(embedded_web_browser2.QueryFrom(unk))) {
// If we initiate a top level navigation then at times MSHTML
// creates a temporary IWebBrowser2 interface which basically shows
// up as a temporary iframe in the parent document. It is not clear
// as to how we can detect this. I tried the usual stuff like
// getting to the parent IHTMLWindow2 interface. They all end up
// pointing to dummy tear off interfaces owned by MSHTML.
// As a temporary workaround, we found that the location url in
// this case is about:blank. We now check for the same and don't
// treat it as an iframe. This should be fine in most cases as we
// hit this code only when the actual page has a meta tag. However
// this would break for cases like the initial src url for an
// iframe pointing to about:blank and the page then writing to it
// via document.write.
// TODO(ananta)
// Revisit this and come up with a better approach.
base::win::ScopedBstr location_url;
embedded_web_browser2->get_LocationURL(location_url.Receive());
std::wstring location_url_string;
location_url_string.assign(location_url, location_url.Length());
if (!LowerCaseEqualsASCII(location_url_string, "about:blank")) {
has_embedded_items = true;
}
}
fetched = 0;
unk.Release();
}
}
}
}
return has_embedded_items;
}
} // end namespace
HRESULT Bho::OnHttpEquiv(IBrowserService_OnHttpEquiv_Fn original_httpequiv,
IBrowserService* browser, IShellView* shell_view, BOOL done,
VARIANT* in_arg, VARIANT* out_arg) {
DVLOG(1) << __FUNCTION__ << " done:" << done;
// OnHttpEquiv with 'done' set to TRUE is called for all pages.
// 0 or more calls with done set to FALSE are made.
// When done is FALSE, the current moniker may not represent the page
// being navigated to so we always have to wait for done to be TRUE
// before re-initiating the navigation.
if (!done && in_arg && VT_BSTR == V_VT(in_arg)) {
if (StrStrI(V_BSTR(in_arg), kChromeContentPrefix)) {
// OnHttpEquiv is invoked for meta tags within sub frames as well.
// We want to switch renderers only for the top level frame.
// The theory here is that if there are any existing embedded items
// (frames or iframes) in the current document, then the http-equiv
// notification is coming from those and not the top level document.
// The embedded items should only be created once the top level
// doc has been created.
if (!DocumentHasEmbeddedItems(browser)) {
NavigationManager* mgr = NavigationManager::GetThreadInstance();
DCHECK(mgr);
DVLOG(1) << "Found tag in page. Marking browser."
<< base::StringPrintf(" tid=0x%08X", ::GetCurrentThreadId());
if (mgr) {
// TODO(tommi): See if we can't figure out a cleaner way to avoid
// this. For some documents we can hit a problem here. When we
// attempt to navigate the document again in CF, mshtml can "complete"
// the current navigation (if all data is available) and fire off
// script events such as onload and even render the page.
// This will happen inside NavigateBrowserToMoniker below.
// To work around this, we clear the contents of the document before
// opening it up in CF.
ClearDocumentContents(browser);
mgr->NavigateToCurrentUrlInCF(browser);
}
}
}
}
return original_httpequiv(browser, shell_view, done, in_arg, out_arg);
}
// static
void Bho::ProcessOptInUrls(IWebBrowser2* browser, BSTR url) {
if (!browser || !url) {
NOTREACHED();
return;
}
#ifndef NDEBUG
// This check must already have been made.
VARIANT_BOOL is_top_level = VARIANT_FALSE;
browser->get_TopLevelContainer(&is_top_level);
DCHECK(is_top_level);
#endif
std::wstring current_url(url, SysStringLen(url));
if (IsValidUrlScheme(GURL(current_url), false)) {
bool cf_protocol = StartsWith(current_url, kChromeProtocolPrefix, false);
if (!cf_protocol && IsChrome(RendererTypeForUrl(current_url))) {
DVLOG(1) << "Opt-in URL. Switching to cf.";
base::win::ScopedComPtr<IBrowserService> browser_service;
DoQueryService(SID_SShellBrowser, browser, browser_service.Receive());
DCHECK(browser_service) << "DoQueryService - SID_SShellBrowser failed.";
MarkBrowserOnThreadForCFNavigation(browser_service);
}
}
}
bool PatchHelper::InitializeAndPatchProtocolsIfNeeded() {
bool ret = false;
_pAtlModule->m_csStaticDataInitAndTypeInfo.Lock();
if (state_ == UNKNOWN) {
g_trans_hooks.InstallHooks();
HttpNegotiatePatch::Initialize();
state_ = PATCH_PROTOCOL;
ret = true;
}
_pAtlModule->m_csStaticDataInitAndTypeInfo.Unlock();
return ret;
}
void PatchHelper::PatchBrowserService(IBrowserService* browser_service) {
DCHECK(state_ == PATCH_IBROWSER);
if (!IS_PATCHED(IBrowserService)) {
vtable_patch::PatchInterfaceMethods(browser_service,
IBrowserService_PatchInfo);
}
}
void PatchHelper::UnpatchIfNeeded() {
if (state_ == PATCH_PROTOCOL) {
g_trans_hooks.RevertHooks();
HttpNegotiatePatch::Uninitialize();
}
state_ = UNKNOWN;
}
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