The Tor Browser: dom/plugins/ipc/interpose/plugin_child_interpose.mm@129ffea94266 (annotated)

dom/plugins/ipc/interpose/plugin_child_interpose.mm@129ffea94266 (annotated)

dom/plugins/ipc/interpose/plugin_child_interpose.mm

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 // Use "dyld interposing" to hook methods imported from other libraries in the
 // plugin child process.  The basic technique is described at
 // http://books.google.com/books?id=K8vUkpOXhN4C&pg=PA73&lpg=PA73&dq=__interpose&source=bl&ots=OJnnXZYpZC&sig=o7I3lXvoduUi13SrPfOON7o3do4&hl=en&ei=AoehS9brCYGQNrvsmeUM&sa=X&oi=book_result&ct=result&resnum=6&ved=0CBsQ6AEwBQ#v=onepage&q=__interpose&f=false.
 // The idea of doing it for the plugin child process comes from Chromium code,
 // particularly from plugin_carbon_interpose_mac.cc
 // (http://codesearch.google.com/codesearch/p?hl=en#OAMlx_jo-ck/src/chrome/browser/plugin_carbon_interpose_mac.cc&q=nscursor&exact_package=chromium&d=1&l=168)
 // and from PluginProcessHost::Init() in plugin_process_host.cc
 // (http://codesearch.google.com/codesearch/p?hl=en#OAMlx_jo-ck/src/content/browser/plugin_process_host.cc&q=nscursor&exact_package=chromium&d=1&l=222).
 // These hooks are needed to make certain OS calls work from the child process
 // (a background process) that would normally only work when called in the
 // parent process (the foreground process).  They allow us to serialize
 // information from the child process to the parent process, so that the same
 // (or equivalent) calls can be made from the parent process.
 // This file lives in a seperate module (libplugin_child_interpose.dylib),
 // which will get loaded by the OS before any other modules when the plugin
 // child process is launched (from GeckoChildProcessHost::
 // PerformAsyncLaunchInternal()).  For this reason it shouldn't link in other
 // browser modules when loaded.  Instead it should use dlsym() to load
 // pointers to the methods it wants to call in other modules.
 #if !defined(__LP64__)
 #include <dlfcn.h>
 #import <Carbon/Carbon.h>
 // The header file QuickdrawAPI.h is missing on OS X 10.7 and up (though the
 // QuickDraw APIs defined in it are still present) -- so we need to supply the
 // relevant parts of its contents here.  It's likely that Apple will eventually
 // remove the APIs themselves (probably in OS X 10.8), so we need to make them
 // weak imports, and test for their presence before using them.
 #if !defined(__QUICKDRAWAPI__)
 struct Cursor;
 extern "C" void SetCursor(const Cursor * crsr) __attribute__((weak_import));
 #endif /* __QUICKDRAWAPI__ */
 BOOL (*OnSetThemeCursorPtr) (ThemeCursor) = NULL;
 BOOL (*OnSetCursorPtr) (const Cursor*) = NULL;
 BOOL (*OnHideCursorPtr) () = NULL;
 BOOL (*OnShowCursorPtr) () = NULL;
 static BOOL loadXULPtrs()
 {
   if (!OnSetThemeCursorPtr) {
     // mac_plugin_interposing_child_OnSetThemeCursor(ThemeCursor cursor) is in
     // PluginInterposeOSX.mm
     OnSetThemeCursorPtr = (BOOL(*)(ThemeCursor))
       dlsym(RTLD_DEFAULT, "mac_plugin_interposing_child_OnSetThemeCursor");
   }
   if (!OnSetCursorPtr) {
     // mac_plugin_interposing_child_OnSetCursor(const Cursor* cursor) is in
     // PluginInterposeOSX.mm
     OnSetCursorPtr = (BOOL(*)(const Cursor*))
       dlsym(RTLD_DEFAULT, "mac_plugin_interposing_child_OnSetCursor");
   }
   if (!OnHideCursorPtr) {
     // mac_plugin_interposing_child_OnHideCursor() is in PluginInterposeOSX.mm
     OnHideCursorPtr = (BOOL(*)())
       dlsym(RTLD_DEFAULT, "mac_plugin_interposing_child_OnHideCursor");
   }
   if (!OnShowCursorPtr) {
     // mac_plugin_interposing_child_OnShowCursor() is in PluginInterposeOSX.mm
     OnShowCursorPtr = (BOOL(*)())
       dlsym(RTLD_DEFAULT, "mac_plugin_interposing_child_OnShowCursor");
   }
   return (OnSetCursorPtr && OnSetThemeCursorPtr && OnHideCursorPtr && OnShowCursorPtr);
 }
 static OSStatus MacPluginChildSetThemeCursor(ThemeCursor cursor)
 {
   if (loadXULPtrs()) {
     OnSetThemeCursorPtr(cursor);
   }
   return ::SetThemeCursor(cursor);
 }
 static void MacPluginChildSetCursor(const Cursor* cursor)
 {
   if (::SetCursor) {
     if (loadXULPtrs()) {
       OnSetCursorPtr(cursor);
     }
     ::SetCursor(cursor);
   }
 }
 static CGError MacPluginChildCGDisplayHideCursor(CGDirectDisplayID display)
 {
   if (loadXULPtrs()) {
     OnHideCursorPtr();
   }
   return ::CGDisplayHideCursor(display);
 }
 static CGError MacPluginChildCGDisplayShowCursor(CGDirectDisplayID display)
 {
   if (loadXULPtrs()) {
     OnShowCursorPtr();
   }
   return ::CGDisplayShowCursor(display);
 }
 #pragma mark -
 struct interpose_substitution {
   const void* replacement;
   const void* original;
 };
 #define INTERPOSE_FUNCTION(function) \
     { reinterpret_cast<const void*>(MacPluginChild##function), \
       reinterpret_cast<const void*>(function) }
 __attribute__((used)) static const interpose_substitution substitutions[]
     __attribute__((section("__DATA, __interpose"))) = {
   INTERPOSE_FUNCTION(SetThemeCursor),
   INTERPOSE_FUNCTION(CGDisplayHideCursor),
   INTERPOSE_FUNCTION(CGDisplayShowCursor),
   // SetCursor() and other QuickDraw APIs will probably be removed in OS X
   // 10.8.  But this will make 'SetCursor' NULL, which will just stop the OS
   // from interposing it (tested using an INTERPOSE_FUNCTION_BROKEN macro
   // that just sets the second address of each tuple to NULL).
   INTERPOSE_FUNCTION(SetCursor),
 };
 #endif  // !__LP64__

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dom/plugins/ipc/interpose/plugin_child_interpose.mm@129ffea94266 (annotated)

dom/plugins/ipc/interpose/plugin_child_interpose.mm