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goldberg_emulator/detours/modules.cpp
Mr_Goldberg c162ca79d5
Update detours library to latest.
2021-05-16 21:04:54 -04:00

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//////////////////////////////////////////////////////////////////////////////
//
// Module Enumeration Functions (modules.cpp of detours.lib)
//
// Microsoft Research Detours Package, Version 4.0.1
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// Module enumeration functions.
//
// #define DETOUR_DEBUG 1
#define DETOURS_INTERNAL
#include "detours.h"
#if DETOURS_VERSION != 0x4c0c1 // 0xMAJORcMINORcPATCH
#error detours.h version mismatch
#endif
#define CLR_DIRECTORY OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR]
#define IAT_DIRECTORY OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT]
//////////////////////////////////////////////////////////////////////////////
//
const GUID DETOUR_EXE_RESTORE_GUID = {
0xbda26f34, 0xbc82, 0x4829,
{ 0x9e, 0x64, 0x74, 0x2c, 0x4, 0xc8, 0x4f, 0xa0 } };
//////////////////////////////////////////////////////////////////////////////
//
PDETOUR_SYM_INFO DetourLoadImageHlp(VOID)
{
static DETOUR_SYM_INFO symInfo;
static PDETOUR_SYM_INFO pSymInfo = NULL;
static BOOL failed = false;
if (failed) {
return NULL;
}
if (pSymInfo != NULL) {
return pSymInfo;
}
ZeroMemory(&symInfo, sizeof(symInfo));
// Create a real handle to the process.
#if 0
DuplicateHandle(GetCurrentProcess(),
GetCurrentProcess(),
GetCurrentProcess(),
&symInfo.hProcess,
0,
FALSE,
DUPLICATE_SAME_ACCESS);
#else
symInfo.hProcess = GetCurrentProcess();
#endif
symInfo.hDbgHelp = LoadLibraryExW(L"dbghelp.dll", NULL, 0);
if (symInfo.hDbgHelp == NULL) {
abort:
failed = true;
if (symInfo.hDbgHelp != NULL) {
FreeLibrary(symInfo.hDbgHelp);
}
symInfo.pfImagehlpApiVersionEx = NULL;
symInfo.pfSymInitialize = NULL;
symInfo.pfSymSetOptions = NULL;
symInfo.pfSymGetOptions = NULL;
symInfo.pfSymLoadModule64 = NULL;
symInfo.pfSymGetModuleInfo64 = NULL;
symInfo.pfSymFromName = NULL;
return NULL;
}
symInfo.pfImagehlpApiVersionEx
= (PF_ImagehlpApiVersionEx)GetProcAddress(symInfo.hDbgHelp,
"ImagehlpApiVersionEx");
symInfo.pfSymInitialize
= (PF_SymInitialize)GetProcAddress(symInfo.hDbgHelp, "SymInitialize");
symInfo.pfSymSetOptions
= (PF_SymSetOptions)GetProcAddress(symInfo.hDbgHelp, "SymSetOptions");
symInfo.pfSymGetOptions
= (PF_SymGetOptions)GetProcAddress(symInfo.hDbgHelp, "SymGetOptions");
symInfo.pfSymLoadModule64
= (PF_SymLoadModule64)GetProcAddress(symInfo.hDbgHelp, "SymLoadModule64");
symInfo.pfSymGetModuleInfo64
= (PF_SymGetModuleInfo64)GetProcAddress(symInfo.hDbgHelp, "SymGetModuleInfo64");
symInfo.pfSymFromName
= (PF_SymFromName)GetProcAddress(symInfo.hDbgHelp, "SymFromName");
API_VERSION av;
ZeroMemory(&av, sizeof(av));
av.MajorVersion = API_VERSION_NUMBER;
if (symInfo.pfImagehlpApiVersionEx == NULL ||
symInfo.pfSymInitialize == NULL ||
symInfo.pfSymLoadModule64 == NULL ||
symInfo.pfSymGetModuleInfo64 == NULL ||
symInfo.pfSymFromName == NULL) {
goto abort;
}
symInfo.pfImagehlpApiVersionEx(&av);
if (av.MajorVersion < API_VERSION_NUMBER) {
goto abort;
}
if (!symInfo.pfSymInitialize(symInfo.hProcess, NULL, FALSE)) {
// We won't retry the initialize if it fails.
goto abort;
}
if (symInfo.pfSymGetOptions != NULL && symInfo.pfSymSetOptions != NULL) {
DWORD dw = symInfo.pfSymGetOptions();
dw &= ~(SYMOPT_CASE_INSENSITIVE |
SYMOPT_UNDNAME |
SYMOPT_DEFERRED_LOADS |
0);
dw |= (
#if defined(SYMOPT_EXACT_SYMBOLS)
SYMOPT_EXACT_SYMBOLS |
#endif
#if defined(SYMOPT_NO_UNQUALIFIED_LOADS)
SYMOPT_NO_UNQUALIFIED_LOADS |
#endif
SYMOPT_DEFERRED_LOADS |
#if defined(SYMOPT_FAIL_CRITICAL_ERRORS)
SYMOPT_FAIL_CRITICAL_ERRORS |
#endif
#if defined(SYMOPT_INCLUDE_32BIT_MODULES)
SYMOPT_INCLUDE_32BIT_MODULES |
#endif
0);
symInfo.pfSymSetOptions(dw);
}
pSymInfo = &symInfo;
return pSymInfo;
}
PVOID WINAPI DetourFindFunction(_In_ LPCSTR pszModule,
_In_ LPCSTR pszFunction)
{
if (pszFunction == NULL) {
SetLastError(ERROR_INVALID_PARAMETER);
return NULL;
}
/////////////////////////////////////////////// First, try GetProcAddress.
//
#pragma prefast(suppress:28752, "We don't do the unicode conversion for LoadLibraryExA.")
HMODULE hModule = LoadLibraryExA(pszModule, NULL, 0);
if (hModule == NULL) {
return NULL;
}
PBYTE pbCode = (PBYTE)GetProcAddress(hModule, pszFunction);
if (pbCode) {
return pbCode;
}
////////////////////////////////////////////////////// Then try ImageHelp.
//
DETOUR_TRACE(("DetourFindFunction(%hs, %hs)\n", pszModule, pszFunction));
PDETOUR_SYM_INFO pSymInfo = DetourLoadImageHlp();
if (pSymInfo == NULL) {
DETOUR_TRACE(("DetourLoadImageHlp failed: %lu\n",
GetLastError()));
return NULL;
}
if (pSymInfo->pfSymLoadModule64(pSymInfo->hProcess, NULL,
(PCHAR)pszModule, NULL,
(DWORD64)hModule, 0) == 0) {
if (ERROR_SUCCESS != GetLastError()) {
DETOUR_TRACE(("SymLoadModule64(%p) failed: %lu\n",
pSymInfo->hProcess, GetLastError()));
return NULL;
}
}
HRESULT hrRet;
CHAR szFullName[512];
IMAGEHLP_MODULE64 modinfo;
ZeroMemory(&modinfo, sizeof(modinfo));
modinfo.SizeOfStruct = sizeof(modinfo);
if (!pSymInfo->pfSymGetModuleInfo64(pSymInfo->hProcess, (DWORD64)hModule, &modinfo)) {
DETOUR_TRACE(("SymGetModuleInfo64(%p, %p) failed: %lu\n",
pSymInfo->hProcess, hModule, GetLastError()));
return NULL;
}
hrRet = StringCchCopyA(szFullName, sizeof(szFullName)/sizeof(CHAR), modinfo.ModuleName);
if (FAILED(hrRet)) {
DETOUR_TRACE(("StringCchCopyA failed: %08lx\n", hrRet));
return NULL;
}
hrRet = StringCchCatA(szFullName, sizeof(szFullName)/sizeof(CHAR), "!");
if (FAILED(hrRet)) {
DETOUR_TRACE(("StringCchCatA failed: %08lx\n", hrRet));
return NULL;
}
hrRet = StringCchCatA(szFullName, sizeof(szFullName)/sizeof(CHAR), pszFunction);
if (FAILED(hrRet)) {
DETOUR_TRACE(("StringCchCatA failed: %08lx\n", hrRet));
return NULL;
}
struct CFullSymbol : SYMBOL_INFO {
CHAR szRestOfName[512];
} symbol;
ZeroMemory(&symbol, sizeof(symbol));
//symbol.ModBase = (ULONG64)hModule;
symbol.SizeOfStruct = sizeof(SYMBOL_INFO);
#ifdef DBHLPAPI
symbol.MaxNameLen = sizeof(symbol.szRestOfName)/sizeof(symbol.szRestOfName[0]);
#else
symbol.MaxNameLength = sizeof(symbol.szRestOfName)/sizeof(symbol.szRestOfName[0]);
#endif
if (!pSymInfo->pfSymFromName(pSymInfo->hProcess, szFullName, &symbol)) {
DETOUR_TRACE(("SymFromName(%hs) failed: %lu\n", szFullName, GetLastError()));
return NULL;
}
#if defined(DETOURS_IA64)
// On the IA64, we get a raw code pointer from the symbol engine
// and have to convert it to a wrapped [code pointer, global pointer].
//
PPLABEL_DESCRIPTOR pldEntry = (PPLABEL_DESCRIPTOR)DetourGetEntryPoint(hModule);
PPLABEL_DESCRIPTOR pldSymbol = new PLABEL_DESCRIPTOR;
pldSymbol->EntryPoint = symbol.Address;
pldSymbol->GlobalPointer = pldEntry->GlobalPointer;
return (PBYTE)pldSymbol;
#elif defined(DETOURS_ARM)
// On the ARM, we get a raw code pointer, which we must convert into a
// valied Thumb2 function pointer.
return DETOURS_PBYTE_TO_PFUNC(symbol.Address);
#else
return (PBYTE)symbol.Address;
#endif
}
//////////////////////////////////////////////////// Module Image Functions.
//
HMODULE WINAPI DetourEnumerateModules(_In_opt_ HMODULE hModuleLast)
{
PBYTE pbLast = (PBYTE)hModuleLast + MM_ALLOCATION_GRANULARITY;
MEMORY_BASIC_INFORMATION mbi;
ZeroMemory(&mbi, sizeof(mbi));
// Find the next memory region that contains a mapped PE image.
//
for (;; pbLast = (PBYTE)mbi.BaseAddress + mbi.RegionSize) {
if (VirtualQuery(pbLast, &mbi, sizeof(mbi)) <= 0) {
break;
}
// Skip uncommitted regions and guard pages.
//
if ((mbi.State != MEM_COMMIT) ||
((mbi.Protect & 0xff) == PAGE_NOACCESS) ||
(mbi.Protect & PAGE_GUARD)) {
continue;
}
__try {
PIMAGE_DOS_HEADER pDosHeader = (PIMAGE_DOS_HEADER)pbLast;
if (pDosHeader->e_magic != IMAGE_DOS_SIGNATURE ||
(DWORD)pDosHeader->e_lfanew > mbi.RegionSize ||
(DWORD)pDosHeader->e_lfanew < sizeof(*pDosHeader)) {
continue;
}
PIMAGE_NT_HEADERS pNtHeader = (PIMAGE_NT_HEADERS)((PBYTE)pDosHeader +
pDosHeader->e_lfanew);
if (pNtHeader->Signature != IMAGE_NT_SIGNATURE) {
continue;
}
SetLastError(NO_ERROR);
return (HMODULE)pDosHeader;
}
#pragma prefast(suppress:28940, "A bad pointer means this probably isn't a PE header.")
__except(GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
continue;
}
}
return NULL;
}
PVOID WINAPI DetourGetEntryPoint(_In_opt_ HMODULE hModule)
{
PIMAGE_DOS_HEADER pDosHeader = (PIMAGE_DOS_HEADER)hModule;
if (hModule == NULL) {
pDosHeader = (PIMAGE_DOS_HEADER)GetModuleHandleW(NULL);
}
__try {
#pragma warning(suppress:6011) // GetModuleHandleW(NULL) never returns NULL.
if (pDosHeader->e_magic != IMAGE_DOS_SIGNATURE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
PIMAGE_NT_HEADERS pNtHeader = (PIMAGE_NT_HEADERS)((PBYTE)pDosHeader +
pDosHeader->e_lfanew);
if (pNtHeader->Signature != IMAGE_NT_SIGNATURE) {
SetLastError(ERROR_INVALID_EXE_SIGNATURE);
return NULL;
}
if (pNtHeader->FileHeader.SizeOfOptionalHeader == 0) {
SetLastError(ERROR_EXE_MARKED_INVALID);
return NULL;
}
PDETOUR_CLR_HEADER pClrHeader = NULL;
if (pNtHeader->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
if (((PIMAGE_NT_HEADERS32)pNtHeader)->CLR_DIRECTORY.VirtualAddress != 0 &&
((PIMAGE_NT_HEADERS32)pNtHeader)->CLR_DIRECTORY.Size != 0) {
pClrHeader = (PDETOUR_CLR_HEADER)
(((PBYTE)pDosHeader)
+ ((PIMAGE_NT_HEADERS32)pNtHeader)->CLR_DIRECTORY.VirtualAddress);
}
}
else if (pNtHeader->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
if (((PIMAGE_NT_HEADERS64)pNtHeader)->CLR_DIRECTORY.VirtualAddress != 0 &&
((PIMAGE_NT_HEADERS64)pNtHeader)->CLR_DIRECTORY.Size != 0) {
pClrHeader = (PDETOUR_CLR_HEADER)
(((PBYTE)pDosHeader)
+ ((PIMAGE_NT_HEADERS64)pNtHeader)->CLR_DIRECTORY.VirtualAddress);
}
}
if (pClrHeader != NULL) {
// For MSIL assemblies, we want to use the _Cor entry points.
HMODULE hClr = GetModuleHandleW(L"MSCOREE.DLL");
if (hClr == NULL) {
return NULL;
}
SetLastError(NO_ERROR);
return (PVOID)GetProcAddress(hClr, "_CorExeMain");
}
SetLastError(NO_ERROR);
// Pure resource DLLs have neither an entry point nor CLR information
// so handle them by returning NULL (LastError is NO_ERROR)
if (pNtHeader->OptionalHeader.AddressOfEntryPoint == 0) {
return NULL;
}
return ((PBYTE)pDosHeader) +
pNtHeader->OptionalHeader.AddressOfEntryPoint;
}
__except(GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
SetLastError(ERROR_EXE_MARKED_INVALID);
return NULL;
}
}
ULONG WINAPI DetourGetModuleSize(_In_opt_ HMODULE hModule)
{
PIMAGE_DOS_HEADER pDosHeader = (PIMAGE_DOS_HEADER)hModule;
if (hModule == NULL) {
pDosHeader = (PIMAGE_DOS_HEADER)GetModuleHandleW(NULL);
}
__try {
#pragma warning(suppress:6011) // GetModuleHandleW(NULL) never returns NULL.
if (pDosHeader->e_magic != IMAGE_DOS_SIGNATURE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
PIMAGE_NT_HEADERS pNtHeader = (PIMAGE_NT_HEADERS)((PBYTE)pDosHeader +
pDosHeader->e_lfanew);
if (pNtHeader->Signature != IMAGE_NT_SIGNATURE) {
SetLastError(ERROR_INVALID_EXE_SIGNATURE);
return NULL;
}
if (pNtHeader->FileHeader.SizeOfOptionalHeader == 0) {
SetLastError(ERROR_EXE_MARKED_INVALID);
return NULL;
}
SetLastError(NO_ERROR);
return (pNtHeader->OptionalHeader.SizeOfImage);
}
__except(GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
SetLastError(ERROR_EXE_MARKED_INVALID);
return NULL;
}
}
HMODULE WINAPI DetourGetContainingModule(_In_ PVOID pvAddr)
{
MEMORY_BASIC_INFORMATION mbi;
ZeroMemory(&mbi, sizeof(mbi));
__try {
if (VirtualQuery(pvAddr, &mbi, sizeof(mbi)) <= 0) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
// Skip uncommitted regions and guard pages.
//
if ((mbi.State != MEM_COMMIT) ||
((mbi.Protect & 0xff) == PAGE_NOACCESS) ||
(mbi.Protect & PAGE_GUARD)) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
PIMAGE_DOS_HEADER pDosHeader = (PIMAGE_DOS_HEADER)mbi.AllocationBase;
if (pDosHeader->e_magic != IMAGE_DOS_SIGNATURE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
PIMAGE_NT_HEADERS pNtHeader = (PIMAGE_NT_HEADERS)((PBYTE)pDosHeader +
pDosHeader->e_lfanew);
if (pNtHeader->Signature != IMAGE_NT_SIGNATURE) {
SetLastError(ERROR_INVALID_EXE_SIGNATURE);
return NULL;
}
if (pNtHeader->FileHeader.SizeOfOptionalHeader == 0) {
SetLastError(ERROR_EXE_MARKED_INVALID);
return NULL;
}
SetLastError(NO_ERROR);
return (HMODULE)pDosHeader;
}
__except(GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
SetLastError(ERROR_INVALID_EXE_SIGNATURE);
return NULL;
}
}
static inline PBYTE RvaAdjust(_Pre_notnull_ PIMAGE_DOS_HEADER pDosHeader, _In_ DWORD raddr)
{
if (raddr != NULL) {
return ((PBYTE)pDosHeader) + raddr;
}
return NULL;
}
BOOL WINAPI DetourEnumerateExports(_In_ HMODULE hModule,
_In_opt_ PVOID pContext,
_In_ PF_DETOUR_ENUMERATE_EXPORT_CALLBACK pfExport)
{
if (pfExport == NULL) {
SetLastError(ERROR_INVALID_PARAMETER);
return FALSE;
}
PIMAGE_DOS_HEADER pDosHeader = (PIMAGE_DOS_HEADER)hModule;
if (hModule == NULL) {
pDosHeader = (PIMAGE_DOS_HEADER)GetModuleHandleW(NULL);
}
__try {
#pragma warning(suppress:6011) // GetModuleHandleW(NULL) never returns NULL.
if (pDosHeader->e_magic != IMAGE_DOS_SIGNATURE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
PIMAGE_NT_HEADERS pNtHeader = (PIMAGE_NT_HEADERS)((PBYTE)pDosHeader +
pDosHeader->e_lfanew);
if (pNtHeader->Signature != IMAGE_NT_SIGNATURE) {
SetLastError(ERROR_INVALID_EXE_SIGNATURE);
return FALSE;
}
if (pNtHeader->FileHeader.SizeOfOptionalHeader == 0) {
SetLastError(ERROR_EXE_MARKED_INVALID);
return FALSE;
}
PIMAGE_EXPORT_DIRECTORY pExportDir
= (PIMAGE_EXPORT_DIRECTORY)
RvaAdjust(pDosHeader,
pNtHeader->OptionalHeader
.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress);
if (pExportDir == NULL) {
SetLastError(ERROR_EXE_MARKED_INVALID);
return FALSE;
}
PBYTE pExportDirEnd = (PBYTE)pExportDir + pNtHeader->OptionalHeader
.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].Size;
PDWORD pdwFunctions = (PDWORD)RvaAdjust(pDosHeader, pExportDir->AddressOfFunctions);
PDWORD pdwNames = (PDWORD)RvaAdjust(pDosHeader, pExportDir->AddressOfNames);
PWORD pwOrdinals = (PWORD)RvaAdjust(pDosHeader, pExportDir->AddressOfNameOrdinals);
for (DWORD nFunc = 0; nFunc < pExportDir->NumberOfFunctions; nFunc++) {
PBYTE pbCode = (pdwFunctions != NULL)
? (PBYTE)RvaAdjust(pDosHeader, pdwFunctions[nFunc]) : NULL;
PCHAR pszName = NULL;
// if the pointer is in the export region, then it is a forwarder.
if (pbCode > (PBYTE)pExportDir && pbCode < pExportDirEnd) {
pbCode = NULL;
}
for (DWORD n = 0; n < pExportDir->NumberOfNames; n++) {
if (pwOrdinals[n] == nFunc) {
pszName = (pdwNames != NULL)
? (PCHAR)RvaAdjust(pDosHeader, pdwNames[n]) : NULL;
break;
}
}
ULONG nOrdinal = pExportDir->Base + nFunc;
if (!pfExport(pContext, nOrdinal, pszName, pbCode)) {
break;
}
}
SetLastError(NO_ERROR);
return TRUE;
}
__except(GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
SetLastError(ERROR_EXE_MARKED_INVALID);
return NULL;
}
}
BOOL WINAPI DetourEnumerateImportsEx(_In_opt_ HMODULE hModule,
_In_opt_ PVOID pContext,
_In_opt_ PF_DETOUR_IMPORT_FILE_CALLBACK pfImportFile,
_In_opt_ PF_DETOUR_IMPORT_FUNC_CALLBACK_EX pfImportFunc)
{
PIMAGE_DOS_HEADER pDosHeader = (PIMAGE_DOS_HEADER)hModule;
if (hModule == NULL) {
pDosHeader = (PIMAGE_DOS_HEADER)GetModuleHandleW(NULL);
}
__try {
#pragma warning(suppress:6011) // GetModuleHandleW(NULL) never returns NULL.
if (pDosHeader->e_magic != IMAGE_DOS_SIGNATURE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return FALSE;
}
PIMAGE_NT_HEADERS pNtHeader = (PIMAGE_NT_HEADERS)((PBYTE)pDosHeader +
pDosHeader->e_lfanew);
if (pNtHeader->Signature != IMAGE_NT_SIGNATURE) {
SetLastError(ERROR_INVALID_EXE_SIGNATURE);
return FALSE;
}
if (pNtHeader->FileHeader.SizeOfOptionalHeader == 0) {
SetLastError(ERROR_EXE_MARKED_INVALID);
return FALSE;
}
PIMAGE_IMPORT_DESCRIPTOR iidp
= (PIMAGE_IMPORT_DESCRIPTOR)
RvaAdjust(pDosHeader,
pNtHeader->OptionalHeader
.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);
if (iidp == NULL) {
SetLastError(ERROR_EXE_MARKED_INVALID);
return FALSE;
}
for (; iidp->OriginalFirstThunk != 0; iidp++) {
PCSTR pszName = (PCHAR)RvaAdjust(pDosHeader, iidp->Name);
if (pszName == NULL) {
SetLastError(ERROR_EXE_MARKED_INVALID);
return FALSE;
}
PIMAGE_THUNK_DATA pThunks = (PIMAGE_THUNK_DATA)
RvaAdjust(pDosHeader, iidp->OriginalFirstThunk);
PVOID * pAddrs = (PVOID *)
RvaAdjust(pDosHeader, iidp->FirstThunk);
HMODULE hFile = DetourGetContainingModule(pAddrs[0]);
if (pfImportFile != NULL) {
if (!pfImportFile(pContext, hFile, pszName)) {
break;
}
}
DWORD nNames = 0;
if (pThunks) {
for (; pThunks[nNames].u1.Ordinal; nNames++) {
DWORD nOrdinal = 0;
PCSTR pszFunc = NULL;
if (IMAGE_SNAP_BY_ORDINAL(pThunks[nNames].u1.Ordinal)) {
nOrdinal = (DWORD)IMAGE_ORDINAL(pThunks[nNames].u1.Ordinal);
}
else {
pszFunc = (PCSTR)RvaAdjust(pDosHeader,
(DWORD)pThunks[nNames].u1.AddressOfData + 2);
}
if (pfImportFunc != NULL) {
if (!pfImportFunc(pContext,
nOrdinal,
pszFunc,
&pAddrs[nNames])) {
break;
}
}
}
if (pfImportFunc != NULL) {
pfImportFunc(pContext, 0, NULL, NULL);
}
}
}
if (pfImportFile != NULL) {
pfImportFile(pContext, NULL, NULL);
}
SetLastError(NO_ERROR);
return TRUE;
}
__except(GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
SetLastError(ERROR_EXE_MARKED_INVALID);
return FALSE;
}
}
// Context for DetourEnumerateImportsThunk, which adapts "regular" callbacks for use with "Ex".
struct _DETOUR_ENUMERATE_IMPORTS_THUNK_CONTEXT
{
PVOID pContext;
PF_DETOUR_IMPORT_FUNC_CALLBACK pfImportFunc;
};
// Callback for DetourEnumerateImportsEx that adapts DetourEnumerateImportsEx
// for use with a DetourEnumerateImports callback -- derefence the IAT and pass the value on.
static
BOOL
CALLBACK
DetourEnumerateImportsThunk(_In_ PVOID VoidContext,
_In_ DWORD nOrdinal,
_In_opt_ PCSTR pszFunc,
_In_opt_ PVOID* ppvFunc)
{
_DETOUR_ENUMERATE_IMPORTS_THUNK_CONTEXT const * const
pContext = (_DETOUR_ENUMERATE_IMPORTS_THUNK_CONTEXT*)VoidContext;
return pContext->pfImportFunc(pContext->pContext, nOrdinal, pszFunc, ppvFunc ? *ppvFunc : NULL);
}
BOOL WINAPI DetourEnumerateImports(_In_opt_ HMODULE hModule,
_In_opt_ PVOID pContext,
_In_opt_ PF_DETOUR_IMPORT_FILE_CALLBACK pfImportFile,
_In_opt_ PF_DETOUR_IMPORT_FUNC_CALLBACK pfImportFunc)
{
if (pfImportFile == NULL || pfImportFunc == NULL) {
SetLastError(ERROR_INVALID_PARAMETER);
return FALSE;
}
_DETOUR_ENUMERATE_IMPORTS_THUNK_CONTEXT const context = { pContext, pfImportFunc };
return DetourEnumerateImportsEx(hModule,
(PVOID)&context,
pfImportFile,
&DetourEnumerateImportsThunk);
}
static PDETOUR_LOADED_BINARY WINAPI GetPayloadSectionFromModule(HMODULE hModule)
{
PIMAGE_DOS_HEADER pDosHeader = (PIMAGE_DOS_HEADER)hModule;
if (hModule == NULL) {
pDosHeader = (PIMAGE_DOS_HEADER)GetModuleHandleW(NULL);
}
__try {
#pragma warning(suppress:6011) // GetModuleHandleW(NULL) never returns NULL.
if (pDosHeader->e_magic != IMAGE_DOS_SIGNATURE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
PIMAGE_NT_HEADERS pNtHeader = (PIMAGE_NT_HEADERS)((PBYTE)pDosHeader +
pDosHeader->e_lfanew);
if (pNtHeader->Signature != IMAGE_NT_SIGNATURE) {
SetLastError(ERROR_INVALID_EXE_SIGNATURE);
return NULL;
}
if (pNtHeader->FileHeader.SizeOfOptionalHeader == 0) {
SetLastError(ERROR_EXE_MARKED_INVALID);
return NULL;
}
PIMAGE_SECTION_HEADER pSectionHeaders
= (PIMAGE_SECTION_HEADER)((PBYTE)pNtHeader
+ sizeof(pNtHeader->Signature)
+ sizeof(pNtHeader->FileHeader)
+ pNtHeader->FileHeader.SizeOfOptionalHeader);
for (DWORD n = 0; n < pNtHeader->FileHeader.NumberOfSections; n++) {
if (strcmp((PCHAR)pSectionHeaders[n].Name, ".detour") == 0) {
if (pSectionHeaders[n].VirtualAddress == 0 ||
pSectionHeaders[n].SizeOfRawData == 0) {
break;
}
PBYTE pbData = (PBYTE)pDosHeader + pSectionHeaders[n].VirtualAddress;
DETOUR_SECTION_HEADER *pHeader = (DETOUR_SECTION_HEADER *)pbData;
if (pHeader->cbHeaderSize < sizeof(DETOUR_SECTION_HEADER) ||
pHeader->nSignature != DETOUR_SECTION_HEADER_SIGNATURE) {
break;
}
if (pHeader->nDataOffset == 0) {
pHeader->nDataOffset = pHeader->cbHeaderSize;
}
SetLastError(NO_ERROR);
return (PBYTE)pHeader;
}
}
SetLastError(ERROR_EXE_MARKED_INVALID);
return NULL;
}
__except(GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
SetLastError(ERROR_EXE_MARKED_INVALID);
return NULL;
}
}
DWORD WINAPI DetourGetSizeOfPayloads(_In_opt_ HMODULE hModule)
{
PDETOUR_LOADED_BINARY pBinary = GetPayloadSectionFromModule(hModule);
if (pBinary == NULL) {
// Error set by GetPayloadSectionFromModule.
return 0;
}
__try {
DETOUR_SECTION_HEADER *pHeader = (DETOUR_SECTION_HEADER *)pBinary;
if (pHeader->cbHeaderSize < sizeof(DETOUR_SECTION_HEADER) ||
pHeader->nSignature != DETOUR_SECTION_HEADER_SIGNATURE) {
SetLastError(ERROR_INVALID_HANDLE);
return 0;
}
SetLastError(NO_ERROR);
return pHeader->cbDataSize;
}
__except(GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
SetLastError(ERROR_INVALID_HANDLE);
return 0;
}
}
_Writable_bytes_(*pcbData)
_Readable_bytes_(*pcbData)
_Success_(return != NULL)
PVOID WINAPI DetourFindPayload(_In_opt_ HMODULE hModule,
_In_ REFGUID rguid,
_Out_opt_ DWORD *pcbData)
{
PBYTE pbData = NULL;
if (pcbData) {
*pcbData = 0;
}
PDETOUR_LOADED_BINARY pBinary = GetPayloadSectionFromModule(hModule);
if (pBinary == NULL) {
// Error set by GetPayloadSectionFromModule.
return NULL;
}
__try {
DETOUR_SECTION_HEADER *pHeader = (DETOUR_SECTION_HEADER *)pBinary;
if (pHeader->cbHeaderSize < sizeof(DETOUR_SECTION_HEADER) ||
pHeader->nSignature != DETOUR_SECTION_HEADER_SIGNATURE) {
SetLastError(ERROR_INVALID_EXE_SIGNATURE);
return NULL;
}
PBYTE pbBeg = ((PBYTE)pHeader) + pHeader->nDataOffset;
PBYTE pbEnd = ((PBYTE)pHeader) + pHeader->cbDataSize;
for (pbData = pbBeg; pbData < pbEnd;) {
DETOUR_SECTION_RECORD *pSection = (DETOUR_SECTION_RECORD *)pbData;
if (DetourAreSameGuid(pSection->guid, rguid)) {
if (pcbData) {
*pcbData = pSection->cbBytes - sizeof(*pSection);
}
SetLastError(NO_ERROR);
return (PBYTE)(pSection + 1);
}
pbData = (PBYTE)pSection + pSection->cbBytes;
}
SetLastError(ERROR_INVALID_HANDLE);
return NULL;
}
__except(GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ?
EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) {
SetLastError(ERROR_INVALID_HANDLE);
return NULL;
}
}
_Writable_bytes_(*pcbData)
_Readable_bytes_(*pcbData)
_Success_(return != NULL)
PVOID WINAPI DetourFindPayloadEx(_In_ REFGUID rguid,
_Out_opt_ DWORD *pcbData)
{
for (HMODULE hMod = NULL; (hMod = DetourEnumerateModules(hMod)) != NULL;) {
PVOID pvData;
pvData = DetourFindPayload(hMod, rguid, pcbData);
if (pvData != NULL) {
return pvData;
}
}
SetLastError(ERROR_MOD_NOT_FOUND);
return NULL;
}
BOOL WINAPI DetourFreePayload(_In_ PVOID pvData)
{
BOOL fSucceeded = FALSE;
// If you have any doubts about the following code, please refer to the comments in DetourCopyPayloadToProcess.
HMODULE hModule = DetourGetContainingModule(pvData);
DETOUR_ASSERT(hModule != NULL);
if (hModule != NULL) {
fSucceeded = VirtualFree(hModule, 0, MEM_RELEASE);
DETOUR_ASSERT(fSucceeded);
if (fSucceeded) {
hModule = NULL;
}
}
return fSucceeded;
}
BOOL WINAPI DetourRestoreAfterWithEx(_In_reads_bytes_(cbData) PVOID pvData,
_In_ DWORD cbData)
{
PDETOUR_EXE_RESTORE pder = (PDETOUR_EXE_RESTORE)pvData;
if (pder->cb != sizeof(*pder) || pder->cb > cbData) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return FALSE;
}
DWORD dwPermIdh = ~0u;
DWORD dwPermInh = ~0u;
DWORD dwPermClr = ~0u;
DWORD dwIgnore;
BOOL fSucceeded = FALSE;
BOOL fUpdated32To64 = FALSE;
if (pder->pclr != NULL && pder->clr.Flags != ((PDETOUR_CLR_HEADER)pder->pclr)->Flags) {
// If we had to promote the 32/64-bit agnostic IL to 64-bit, we can't restore
// that.
fUpdated32To64 = TRUE;
}
if (DetourVirtualProtectSameExecute(pder->pidh, pder->cbidh,
PAGE_EXECUTE_READWRITE, &dwPermIdh)) {
if (DetourVirtualProtectSameExecute(pder->pinh, pder->cbinh,
PAGE_EXECUTE_READWRITE, &dwPermInh)) {
CopyMemory(pder->pidh, &pder->idh, pder->cbidh);
CopyMemory(pder->pinh, &pder->inh, pder->cbinh);
if (pder->pclr != NULL && !fUpdated32To64) {
if (DetourVirtualProtectSameExecute(pder->pclr, pder->cbclr,
PAGE_EXECUTE_READWRITE, &dwPermClr)) {
CopyMemory(pder->pclr, &pder->clr, pder->cbclr);
VirtualProtect(pder->pclr, pder->cbclr, dwPermClr, &dwIgnore);
fSucceeded = TRUE;
}
}
else {
fSucceeded = TRUE;
}
VirtualProtect(pder->pinh, pder->cbinh, dwPermInh, &dwIgnore);
}
VirtualProtect(pder->pidh, pder->cbidh, dwPermIdh, &dwIgnore);
}
// Delete the payload after successful recovery to prevent repeated restore
if (fSucceeded) {
DetourFreePayload(pder);
pder = NULL;
}
return fSucceeded;
}
BOOL WINAPI DetourRestoreAfterWith()
{
PVOID pvData;
DWORD cbData;
pvData = DetourFindPayloadEx(DETOUR_EXE_RESTORE_GUID, &cbData);
if (pvData != NULL && cbData != 0) {
return DetourRestoreAfterWithEx(pvData, cbData);
}
SetLastError(ERROR_MOD_NOT_FOUND);
return FALSE;
}
// End of File
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