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/******************************************************************************
* The MIT License (MIT)
*
* Copyright (c) 2014-2023 Baldur Karlsson
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
******************************************************************************/
// This project deliberately references only kernel32.dll (ie. not even the CRT)
// so that when inserted into an application it has as small an overhead/impact
// as possible. Ideally it would be present only to be a pass-through hook and
// the first time only to allocate a little, check if this process should be hooked
// and load the renderdoc dll.
//
// The no-CRT restriction causes some awkward bits and pieces but the dll is simple
// enough that it's not a big issue.
#include "renderdocshim.h"
#include <windows.h>
struct CaptureOptions;
typedef void(__cdecl *pINTERNAL_SetCaptureOptions)(const CaptureOptions *opts);
typedef void(__cdecl *pINTERNAL_SetLogFile)(const char *logfile);
typedef void(__cdecl *pINTERNAL_SetDebugLogFile)(const char *logfile);
#if defined(RELEASE)
#define LOGPRINT(txt) \
do \
{ \
} while(0)
#else
// define this to something to get logging
//#define LOGPRINT(txt) OutputDebugStringW(txt)
#define LOGPRINT(txt) \
do \
{ \
} while(0)
#endif
void CheckHook()
{
ShimData *data = NULL;
HANDLE datahandle = OpenFileMappingA(FILE_MAP_READ, FALSE, GLOBAL_HOOK_DATA_NAME);
if(datahandle == NULL)
{
LOGPRINT(L"renderdocshim: can't open global data\n");
return;
}
data = (ShimData *)MapViewOfFile(datahandle, FILE_MAP_READ, 0, 0, sizeof(ShimData));
if(data == NULL)
{
CloseHandle(datahandle);
LOGPRINT(L"renderdocshim: can't map global data\n");
return;
}
if(data->pathmatchstring[0] == 0 || data->pathmatchstring[1] == 0 ||
data->pathmatchstring[2] == 0 || data->pathmatchstring[3] == 0)
{
LOGPRINT(L"renderdocshim: invalid pathmatchstring: '");
LOGPRINT(data->pathmatchstring);
LOGPRINT(L"'\n");
UnmapViewOfFile(data);
CloseHandle(datahandle);
return;
}
// no new[], need to use VirtualAlloc
const int exepathLen = 1024;
wchar_t *exepath = (wchar_t *)VirtualAlloc(NULL, exepathLen * sizeof(wchar_t),
MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if(exepath)
{
// no memset :).
for(int i = 0; i < exepathLen; i++)
exepath[i] = 0;
GetModuleFileNameW(NULL, exepath, exepathLen - 1);
// no str*cmp functions
int find = FindStringOrdinal(FIND_FROMSTART, exepath, -1, data->pathmatchstring, -1, TRUE);
if(find >= 0)
{
LOGPRINT(L"renderdocshim: Hooking into '");
LOGPRINT(exepath);
LOGPRINT(L"', based on '");
LOGPRINT(data->pathmatchstring);
LOGPRINT(L"'\n");
HMODULE mod = LoadLibraryW(data->rdocpath);
if(mod)
{
pINTERNAL_SetCaptureOptions setopts =
(pINTERNAL_SetCaptureOptions)GetProcAddress(mod, "INTERNAL_SetCaptureOptions");
pINTERNAL_SetLogFile setlogfile =
(pINTERNAL_SetLogFile)GetProcAddress(mod, "INTERNAL_SetLogFile");
pINTERNAL_SetDebugLogFile setdebuglog =
(pINTERNAL_SetDebugLogFile)GetProcAddress(mod, "INTERNAL_SetDebugLogFile");
if(setopts)
setopts((const CaptureOptions *)data->opts);
if(setlogfile && data->capfile[0])
setlogfile(data->capfile);
if(setdebuglog && data->debuglog[0])
setdebuglog(data->debuglog);
}
}
else
{
LOGPRINT(L"renderdocshim: NOT Hooking into '");
LOGPRINT(exepath);
LOGPRINT(L"', based on '");
LOGPRINT(data->pathmatchstring);
LOGPRINT(L"'\n");
}
VirtualFree(exepath, 0, MEM_RELEASE);
}
else
{
LOGPRINT(L"renderdocshim: Failed to allocate exepath\n");
}
UnmapViewOfFile(data);
CloseHandle(datahandle);
}
DWORD CheckHookThread(LPVOID param)
{
CheckHook();
// this makes sure that we remove the reference to the shim dll and unload from
// the target process. That minimises the impact of having the dll inserted into
// every process
FreeLibraryAndExitThread((HMODULE)param, 0);
return 0;
}
BOOL APIENTRY dll_entry(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
if(ul_reason_for_call == DLL_PROCESS_ATTACH)
{
DisableThreadLibraryCalls(hModule);
// create a thread so that we can perform more complex actions (DllMain must be minimal
// in size, even this is a bit dodgy).
CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)&CheckHookThread, (LPVOID)hModule, 0, NULL);
}
return TRUE;
}
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