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| 1 // Copyright (c) 2013 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 "chrome/app/delay_load_hook_win.h" |
| 6 |
| 7 #if defined(_WIN32_WINNT_WIN8) && _MSC_VER < 1700 |
| 8 // The Windows 8 SDK defines FACILITY_VISUALCPP in winerror.h, and in |
| 9 // delayimp.h previous to VS2012. |
| 10 #undef FACILITY_VISUALCPP |
| 11 #endif |
| 12 #include <DelayIMP.h> |
| 13 |
| 14 #include "base/logging.h" |
| 15 #include "base/string_util.h" |
| 16 #include "base/stringprintf.h" |
| 17 |
| 18 // So long as these symbols are supplied to the final binary through an |
| 19 // object file (as opposed to indirectly through a library), these pointers |
| 20 // will override the CRT's symbols and direct the notifications to our hook. |
| 21 // Alternatively referencing the ChromeDelayLoadHook function somehow will |
| 22 // cause this declaration of these variables to take preference to the delay |
| 23 // load runtime's defaults (in delayimp.lib). |
| 24 PfnDliHook __pfnDliNotifyHook2 = ChromeDelayLoadHook; |
| 25 PfnDliHook __pfnDliFailureHook2 = ChromeDelayLoadHook; |
| 26 |
| 27 |
| 28 namespace { |
| 29 |
| 30 FARPROC OnPreLoadLibrary(DelayLoadInfo* info) { |
| 31 // If the DLL name ends with "-delay.dll", this call is about one of our |
| 32 // custom import libraries. In this case we need to snip the suffix off, |
| 33 // and bind to the real DLL. |
| 34 std::string dll_name(info->szDll); |
| 35 const char kDelaySuffix[] = "-delay.dll"; |
| 36 if (EndsWith(dll_name, kDelaySuffix, false)) { |
| 37 // Trim the "-delay.dll" suffix from the string. |
| 38 dll_name.resize(dll_name.length() - (sizeof(kDelaySuffix) - 1)); |
| 39 dll_name.append(".dll"); |
| 40 |
| 41 return reinterpret_cast<FARPROC>(::LoadLibraryA(dll_name.c_str())); |
| 42 } |
| 43 |
| 44 return NULL; |
| 45 } |
| 46 |
| 47 } // namespace |
| 48 |
| 49 // This function is a delay load notification hook. It is invoked by the |
| 50 // delay load support in the visual studio runtime. |
| 51 // See http://msdn.microsoft.com/en-us/library/z9h1h6ty(v=vs.100).aspx for |
| 52 // details. |
| 53 extern "C" FARPROC WINAPI ChromeDelayLoadHook(unsigned reason, |
| 54 DelayLoadInfo* info) { |
| 55 switch (reason) { |
| 56 case dliNoteStartProcessing: |
| 57 case dliNoteEndProcessing: |
| 58 // Nothing to do here. |
| 59 break; |
| 60 |
| 61 case dliNotePreLoadLibrary: |
| 62 return OnPreLoadLibrary(info); |
| 63 break; |
| 64 |
| 65 case dliNotePreGetProcAddress: |
| 66 // Nothing to do here. |
| 67 break; |
| 68 |
| 69 case dliFailLoadLib: |
| 70 case dliFailGetProc: |
| 71 // Returning NULL from error notifications will cause the delay load |
| 72 // runtime to raise a VcppException structured exception, that some code |
| 73 // might want to handle. |
| 74 return NULL; |
| 75 break; |
| 76 |
| 77 default: |
| 78 NOTREACHED() << "Impossible delay load notification."; |
| 79 break; |
| 80 } |
| 81 |
| 82 // Returning NULL causes the delay load machinery to perform default |
| 83 // processing for this notification. |
| 84 return NULL; |
| 85 } |
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