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Merge pull request #211 from Snawoot/win_fbc_pd_sniffer

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win: fbc: sniff/replay
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Snawoot 2019-12-08 00:27:46 +02:00 committed by GitHub
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6 changed files with 170 additions and 20 deletions
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15
win/nvfbcwrp/README.md
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@ -5,7 +5,7 @@ Wrapper for `NvFBC64.dll` library which injects private keys into `NvFBC_CreateE
## Usage
1. Obtain `nvfbcwrp64.dll` and `nvfbcwrp32.dll` files. You may build them yourself with MSVS 2019 or download latest release here: [nvfbcwrp64.dll](https://gist.github.com/Snawoot/2d78c569b5ffb29080cf9bfca401adfa/raw/166c5e10f8301000c171d5f59cc2ae0b551cd1b3/nvfbcwrp64.dll), [nvfbcwrp32.dll](https://gist.github.com/Snawoot/2d78c569b5ffb29080cf9bfca401adfa/raw/166c5e10f8301000c171d5f59cc2ae0b551cd1b3/nvfbcwrp32.dll).
1. Obtain `nvfbcwrp64.dll` and `nvfbcwrp32.dll` files. You may build them yourself with MSVS 2019 or download latest release here: [nvfbcwrp64.dll](https://gist.github.com/Snawoot/17b14e7ce0f7412b91587c2723719eff/raw/e8e9658fd20751ad875477f37b49ea158ece896d/nvfbcwrp64.dll), [nvfbcwrp32.dll](https://gist.github.com/Snawoot/17b14e7ce0f7412b91587c2723719eff/raw/e8e9658fd20751ad875477f37b49ea158ece896d/nvfbcwrp32.dll).
2. Backup your `%WINDIR\system32\NvFBC64.dll` and `%WINDIR\SysWOW64\NvFBC.dll` files.
3. Rename file `%WINDIR\system32\NvFBC64.dll` to `%WINDIR\system32\NvFBC64_.dll`
4. Rename file `%WINDIR\SysWOW64\NvFBC.dll` to `%WINDIR\SysWOW64\NvFBC_.dll`
@ -14,3 +14,16 @@ Wrapper for `NvFBC64.dll` library which injects private keys into `NvFBC_CreateE
7. Restart any applications using this library. That's it.
This procedure has to be repeated after any driver reinstall/update, so keep your copies of `nvfbcwrp64.dll` and `nvfbcwrp32.dll` files.
## Advanced Usage
`nvfbcwrp` allows user to capture and replay `privateData` used by other NvFBC applications (like GeForce Experience, Shadow Play and so on). It may be useful if built-in `privateData` will render invalid for some reason. Wrapper recognizes two environment variables:
* `NVFBCWRP_DUMP_DIR` - output directory for dumps of `privateData` sent by applications.
* `NVFBCWRP_PRIVDATA_FILE` - name of file with `privateData` which should be used instead of default built-in vector. These files can be produced as output of `NVFBCWRP_DUMP_DIR` option. If file is not found or can't be loaded, default magic vector is used.
Hence, if default magic baked into nvfbcwrp doesn't work for you, you have to:
1. Specify environment variable `NVFBCWRP_DUMP_DIR` in your configuration with path to existing writable directory. Here is a [guide](http://web.archive.org/web/20191207221102/https://docs.oracle.com/en/database/oracle/r-enterprise/1.5.1/oread/creating-and-modifying-environment-variables-on-windows.html) about environment variables edit. It's sufficient to add "user" environment variable.
2. Run some NvFBC application with valid `privateData` keys and initiate recording session.
3. Grab some output file and specify it's path in `NVFBCWRP_PRIVDATA_FILE`. At this point you can unset `NVFBCWRP_DUMP_DIR` to stop `privateData` capture.

2
win/nvfbcwrp/framework.h
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@ -3,3 +3,5 @@
#define WIN32_LEAN_AND_MEAN // Исключите редко используемые компоненты из заголовков Windows
// Файлы заголовков Windows
#include <windows.h>
#include <new>
#include <tuple>

3
win/nvfbcwrp/nvfbcdefs.h
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@ -1,8 +1,5 @@
#pragma once
// Magic code which is passed as pPrivateData and enables NvFBC to work on GeForce
int magic[] = { 0x0D7BC620, 0x4C17E142, 0x5E6B5997, 0x4B5A855B };
typedef unsigned long NvU32; /* 0 to 4294967295 */
/**

10
win/nvfbcwrp/nvfbcwrp.vcxproj
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@ -30,27 +30,27 @@
<ConfigurationType>DynamicLibrary</ConfigurationType>
<UseDebugLibraries>true</UseDebugLibraries>
<PlatformToolset>v142</PlatformToolset>
<CharacterSet>MultiByte</CharacterSet>
<CharacterSet>Unicode</CharacterSet>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
<ConfigurationType>DynamicLibrary</ConfigurationType>
<UseDebugLibraries>false</UseDebugLibraries>
<PlatformToolset>v142</PlatformToolset>
<WholeProgramOptimization>true</WholeProgramOptimization>
<CharacterSet>MultiByte</CharacterSet>
<CharacterSet>Unicode</CharacterSet>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
<ConfigurationType>DynamicLibrary</ConfigurationType>
<UseDebugLibraries>true</UseDebugLibraries>
<PlatformToolset>v142</PlatformToolset>
<CharacterSet>MultiByte</CharacterSet>
<CharacterSet>Unicode</CharacterSet>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
<ConfigurationType>DynamicLibrary</ConfigurationType>
<UseDebugLibraries>false</UseDebugLibraries>
<PlatformToolset>v142</PlatformToolset>
<WholeProgramOptimization>true</WholeProgramOptimization>
<CharacterSet>MultiByte</CharacterSet>
<CharacterSet>Unicode</CharacterSet>
</PropertyGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
<ImportGroup Label="ExtensionSettings">
@ -132,6 +132,7 @@
<PreprocessorDefinitions>WIN32;NDEBUG;NVFBCWRP_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ConformanceMode>true</ConformanceMode>
<PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
<BufferSecurityCheck>true</BufferSecurityCheck>
</ClCompile>
<Link>
<SubSystem>Windows</SubSystem>
@ -154,6 +155,7 @@
<PreprocessorDefinitions>NDEBUG;NVFBCWRP_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ConformanceMode>true</ConformanceMode>
<PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
<BufferSecurityCheck>true</BufferSecurityCheck>
</ClCompile>
<Link>
<SubSystem>Windows</SubSystem>

6
win/nvfbcwrp/nvfbcwrp.vcxproj.filters
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@ -15,15 +15,15 @@
</Filter>
</ItemGroup>
<ItemGroup>
<ClInclude Include="framework.h">
<Filter>Файлы заголовков</Filter>
</ClInclude>
<ClInclude Include="pch.h">
<Filter>Файлы заголовков</Filter>
</ClInclude>
<ClInclude Include="nvfbcdefs.h">
<Filter>Файлы заголовков</Filter>
</ClInclude>
<ClInclude Include="framework.h">
<Filter>Файлы заголовков</Filter>
</ClInclude>
</ItemGroup>
<ItemGroup>
<ClCompile Include="pch.cpp">

154
win/nvfbcwrp/nvfbcwrp_main.cpp
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@ -1,29 +1,117 @@
#include "pch.h"
#include "nvfbcdefs.h"
#include <windows.h>
#ifdef _WIN64
#define LIBNAME ".\\NvFBC64_.dll"
#define LIBNAME TEXT(".\\NvFBC64_.dll")
#else
#define LIBNAME ".\\NvFBC_.dll"
#define LIBNAME TEXT(".\\NvFBC_.dll")
#endif
HINSTANCE hLThis = 0;
#define ENV_NVFBC_DUMPDIR TEXT("NVFBCWRP_DUMP_DIR")
#define ENV_NVFBC_PRIVDATA_FILE TEXT("NVFBCWRP_PRIVDATA_FILE")
#define NVFBC_PRIVDATA_DUMP_PREFIX TEXT("pd_")
extern "C" {
FARPROC ORIG_NvFBC_Create, ORIG_NvFBC_Enable, ORIG_NvFBC_GetSDKVersion,
ORIG_NvFBC_GetStatus, ORIG_NvFBC_GetStatusEx, ORIG_NvFBC_SetGlobalFlags,
ORIG_NvOptimusEnablement;
}
NvFBC_CreateFunctionExType ORIG_NvFBC_CreateEx;
HINSTANCE hL = 0;
// Default magic code which is passed as pPrivateData
// and enables NvFBC to work on GeForce
DWORD default_magic[] = { 0xAEF57AC5, 0x401D1A39, 0x1B856BBE, 0x9ED0CEBA };
void* magic = default_magic;
NvU32 magic_size = sizeof(default_magic);
TCHAR* dumpPath = NULL;
TCHAR* getEnvVar(const TCHAR* name, DWORD size = MAX_PATH) {
TCHAR* buf = NULL;
try {
buf = new TCHAR[size];
}
catch (std::bad_alloc&) {
return NULL;
}
DWORD ret = GetEnvironmentVariable(name, buf, size);
if (ret != 0 && size > ret) {
return buf;
}
else {
delete buf;
return NULL;
}
}
std::tuple<NvU32, void*> tryGetMagic() {
TCHAR* filename = getEnvVar(ENV_NVFBC_PRIVDATA_FILE);
if (!filename) {
return { 0, NULL };
}
HANDLE hFile = INVALID_HANDLE_VALUE;
hFile = CreateFile(filename,
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
delete filename;
if (hFile == INVALID_HANDLE_VALUE) {
return { 0, NULL };
}
LARGE_INTEGER size;
LARGE_INTEGER zero;
zero.QuadPart = 0;
if (!SetFilePointerEx(hFile, zero, &size, FILE_END)) {
CloseHandle(hFile);
return { 0, NULL };
}
if (size.HighPart) {
CloseHandle(hFile);
return { 0, NULL };
}
if (!SetFilePointerEx(hFile, zero, NULL, FILE_BEGIN)) {
CloseHandle(hFile);
return { 0, NULL };
}
char* buf = NULL;
try {
buf = new char[size.LowPart];
}
catch (std::bad_alloc&)
{
CloseHandle(hFile);
return { 0, NULL };
}
DWORD bytes_read = 0;
if (ReadFile(hFile, buf, size.LowPart, &bytes_read, NULL) &&
bytes_read == size.LowPart) {
CloseHandle(hFile);
return { size.LowPart, buf };
}
else {
CloseHandle(hFile);
delete buf;
return { 0, NULL };
}
}
BOOL WINAPI DllMain(HINSTANCE hInst,DWORD reason,LPVOID)
{
HINSTANCE hL = 0;
if (reason == DLL_PROCESS_ATTACH)
{
//hLThis = hInst;
hL = LoadLibrary(LIBNAME);
if (!hL) return false;
// DllMain calls are serialized by system on process level, so we are clear
// to set required variables.
ORIG_NvFBC_Create = GetProcAddress(hL, "NvFBC_Create");
if (!ORIG_NvFBC_Create) return false;
ORIG_NvFBC_CreateEx = (NvFBC_CreateFunctionExType)::GetProcAddress(hL, "NvFBC_CreateEx");
@ -40,24 +128,69 @@ BOOL WINAPI DllMain(HINSTANCE hInst,DWORD reason,LPVOID)
if (!ORIG_NvFBC_SetGlobalFlags) return false;
ORIG_NvOptimusEnablement = GetProcAddress(hL, "NvOptimusEnablement");
if (!ORIG_NvOptimusEnablement) return false;
// Check dump settings
if (TCHAR* dumpDirName = getEnvVar(ENV_NVFBC_DUMPDIR))
{
dumpPath = dumpDirName;
}
if (reason == DLL_PROCESS_DETACH)
// Check external magic file
NvU32 new_magic_size;
void* new_magic;
std::tie(new_magic_size, new_magic) = tryGetMagic();
if (new_magic) {
magic = new_magic;
magic_size = new_magic_size;
}
}
if (reason == DLL_PROCESS_DETACH && hL)
{
FreeLibrary(hL);
if (dumpPath) {
delete dumpPath;
dumpPath = NULL;
}
if (magic != default_magic) {
delete magic;
magic = NULL;
}
return true;
}
return true;
}
void tryDumpPrivateData(NvU32 size, void* data)
{
TCHAR szTmpFilename[MAX_PATH];
if (dumpPath && GetTempFileName(dumpPath, NVFBC_PRIVDATA_DUMP_PREFIX, 0, szTmpFilename) != 0) {
// Privdata spying enabled and tempfile created.
// Attempt to dump private data.
HANDLE hTempFile = INVALID_HANDLE_VALUE;
hTempFile = CreateFile((LPTSTR)szTmpFilename,
GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (hTempFile != INVALID_HANDLE_VALUE) {
// File is open, dumping data.
WriteFile(hTempFile, data, size, NULL, NULL);
CloseHandle(hTempFile);
}
}
}
NVFBCRESULT NVFBCAPI PROXY_NvFBC_CreateEx(NvFBCCreateParams* params) {
if (params->dwPrivateDataSize == 0 && params->pPrivateData == NULL) {
//Backup old values
void* bkp_privdata = params->pPrivateData;
NvU32 bkp_privdatasize = params->dwPrivateDataSize;
// Inject private keys into structure
params->dwPrivateDataSize = sizeof(magic);
params->pPrivateData = &magic;
params->dwPrivateDataSize = magic_size;
params->pPrivateData = magic;
// Invoke original function
NVFBCRESULT res = ORIG_NvFBC_CreateEx(params);
// Rollback private data changes in params structure
@ -66,6 +199,9 @@ NVFBCRESULT NVFBCAPI PROXY_NvFBC_CreateEx(NvFBCCreateParams* params) {
return res;
}
else {
if (params->dwPrivateDataSize > 0 && params->pPrivateData != NULL) {
tryDumpPrivateData(params->dwPrivateDataSize, params->pPrivateData);
}
return ORIG_NvFBC_CreateEx((void*)params);
}
}