Add a helper process to Chrome Frame to allow for non-administrative installs. The helper process registers a hook dll that performs the necessary BHO injection instead of registering it in HKLM.

BUG=53127
TEST=Non-admin CF installs work.

Review URL: http://codereview.chromium.org/3158036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@57860 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 88 insertions, 0 deletions

diff --git a/chrome_frame/chrome_frame_helper_util.cc b/chrome_frame/chrome_frame_helper_util.cc
new file mode 100644
index 0000000..d246881
--- /dev/null
+++ b/chrome_frame/chrome_frame_helper_util.cc
@@ -0,0 +1,88 @@
+// Copyright (c) 2010 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/chrome_frame_helper_util.h"
+
+#include <shlwapi.h>
+
+const wchar_t kGetBrowserMessage[] = L"GetAutomationObject";
+
+bool UtilIsWebBrowserWindow(HWND window_to_check) {
+  bool is_browser_window = false;
+
+  if (!IsWindow(window_to_check)) {
+    return is_browser_window;
+  }
+
+  static wchar_t* known_ie_window_classes[] = {
+    L"IEFrame",
+    L"TabWindowClass"
+  };
+
+  for (int i = 0; i < ARRAYSIZE(known_ie_window_classes); i++) {
+    if (IsWindowOfClass(window_to_check, known_ie_window_classes[i])) {
+     is_browser_window = true;
+     break;
+    }
+  }
+
+  return is_browser_window;
+}
+
+HRESULT UtilGetWebBrowserObjectFromWindow(HWND window,
+                                          REFIID iid,
+                                          void** web_browser_object) {
+  if (NULL == web_browser_object) {
+    return E_POINTER;
+  }
+
+  // Check whether this window is really a web browser window.
+  if (UtilIsWebBrowserWindow(window)) {
+    // IWebBroswer2 interface pointer can be retrieved from the browser
+    // window by simply sending a registered message "GetAutomationObject"
+    // Note that since we are sending a message to parent window make sure that
+    // it is in the same thread.
+    if (GetWindowThreadProcessId(window, NULL) != GetCurrentThreadId()) {
+      return E_UNEXPECTED;
+    }
+
+    static const ULONG get_browser_message =
+        RegisterWindowMessageW(kGetBrowserMessage);
+
+    *web_browser_object =
+        reinterpret_cast<void*>(SendMessage(window,
+                                            get_browser_message,
+                                            reinterpret_cast<WPARAM>(&iid),
+                                            NULL));
+    if (NULL != *web_browser_object) {
+      return S_OK;
+    }
+  } else {
+    return E_INVALIDARG;
+  }
+  return E_NOINTERFACE;
+}
+
+
+bool IsWindowOfClass(HWND window_to_check, const wchar_t* window_class) {
+  bool window_matches = false;
+  const int buf_size = MAX_PATH;
+  wchar_t buffer[buf_size] = {0};
+  DWORD dwRetSize = GetClassNameW(window_to_check, buffer, buf_size);
+  // If the window name is any longer than this, it isn't the one we want.
+  if (dwRetSize < (buf_size - 1)) {
+    if (0 == lstrcmpiW(window_class, buffer)) {
+     window_matches = true;
+    }
+  }
+  return window_matches;
+}
+
+
+bool IsNamedProcess(const wchar_t* process_name) {
+  wchar_t file_path[2048] = {0};
+  GetModuleFileName(NULL, file_path, 2047);
+  wchar_t* file_name = PathFindFileName(file_path);
+  return (0 == lstrcmpiW(file_name, process_name));
+}