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This commit is contained in:
Joachim Bauch
2013-03-09 00:42:29 +01:00
parent f210f67771
commit a199afce7c
3 changed files with 370 additions and 370 deletions
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MemoryModule.c
+329 -329
View File
@@ -49,15 +49,15 @@
#include "MemoryModule.h"
typedef struct {
PIMAGE_NT_HEADERS headers;
unsigned char *codeBase;
HCUSTOMMODULE *modules;
int numModules;
int initialized;
CustomLoadLibraryFunc loadLibrary;
CustomGetProcAddressFunc getProcAddress;
CustomFreeLibraryFunc freeLibrary;
void *userdata;
PIMAGE_NT_HEADERS headers;
unsigned char *codeBase;
HCUSTOMMODULE *modules;
int numModules;
int initialized;
CustomLoadLibraryFunc loadLibrary;
CustomGetProcAddressFunc getProcAddress;
CustomFreeLibraryFunc freeLibrary;
void *userdata;
} MEMORYMODULE, *PMEMORYMODULE;
typedef BOOL (WINAPI *DllEntryProc)(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved);
@@ -68,116 +68,116 @@ typedef BOOL (WINAPI *DllEntryProc)(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID
static void
OutputLastError(const char *msg)
{
LPVOID tmp;
char *tmpmsg;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&tmp, 0, NULL);
tmpmsg = (char *)LocalAlloc(LPTR, strlen(msg) + strlen(tmp) + 3);
sprintf(tmpmsg, "%s: %s", msg, tmp);
OutputDebugString(tmpmsg);
LocalFree(tmpmsg);
LocalFree(tmp);
LPVOID tmp;
char *tmpmsg;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&tmp, 0, NULL);
tmpmsg = (char *)LocalAlloc(LPTR, strlen(msg) + strlen(tmp) + 3);
sprintf(tmpmsg, "%s: %s", msg, tmp);
OutputDebugString(tmpmsg);
LocalFree(tmpmsg);
LocalFree(tmp);
}
#endif
static void
CopySections(const unsigned char *data, PIMAGE_NT_HEADERS old_headers, PMEMORYMODULE module)
{
int i, size;
unsigned char *codeBase = module->codeBase;
unsigned char *dest;
PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(module->headers);
for (i=0; i<module->headers->FileHeader.NumberOfSections; i++, section++) {
if (section->SizeOfRawData == 0) {
// section doesn't contain data in the dll itself, but may define
// uninitialized data
size = old_headers->OptionalHeader.SectionAlignment;
if (size > 0) {
dest = (unsigned char *)VirtualAlloc(codeBase + section->VirtualAddress,
size,
MEM_COMMIT,
PAGE_READWRITE);
int i, size;
unsigned char *codeBase = module->codeBase;
unsigned char *dest;
PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(module->headers);
for (i=0; i<module->headers->FileHeader.NumberOfSections; i++, section++) {
if (section->SizeOfRawData == 0) {
// section doesn't contain data in the dll itself, but may define
// uninitialized data
size = old_headers->OptionalHeader.SectionAlignment;
if (size > 0) {
dest = (unsigned char *)VirtualAlloc(codeBase + section->VirtualAddress,
size,
MEM_COMMIT,
PAGE_READWRITE);
section->Misc.PhysicalAddress = (POINTER_TYPE)dest;
memset(dest, 0, size);
}
section->Misc.PhysicalAddress = (POINTER_TYPE)dest;
memset(dest, 0, size);
}
// section is empty
continue;
}
// section is empty
continue;
}
// commit memory block and copy data from dll
dest = (unsigned char *)VirtualAlloc(codeBase + section->VirtualAddress,
section->SizeOfRawData,
MEM_COMMIT,
PAGE_READWRITE);
memcpy(dest, data + section->PointerToRawData, section->SizeOfRawData);
section->Misc.PhysicalAddress = (POINTER_TYPE)dest;
}
// commit memory block and copy data from dll
dest = (unsigned char *)VirtualAlloc(codeBase + section->VirtualAddress,
section->SizeOfRawData,
MEM_COMMIT,
PAGE_READWRITE);
memcpy(dest, data + section->PointerToRawData, section->SizeOfRawData);
section->Misc.PhysicalAddress = (POINTER_TYPE)dest;
}
}
// Protection flags for memory pages (Executable, Readable, Writeable)
static int ProtectionFlags[2][2][2] = {
{
// not executable
{PAGE_NOACCESS, PAGE_WRITECOPY},
{PAGE_READONLY, PAGE_READWRITE},
}, {
// executable
{PAGE_EXECUTE, PAGE_EXECUTE_WRITECOPY},
{PAGE_EXECUTE_READ, PAGE_EXECUTE_READWRITE},
},
{
// not executable
{PAGE_NOACCESS, PAGE_WRITECOPY},
{PAGE_READONLY, PAGE_READWRITE},
}, {
// executable
{PAGE_EXECUTE, PAGE_EXECUTE_WRITECOPY},
{PAGE_EXECUTE_READ, PAGE_EXECUTE_READWRITE},
},
};
static void
FinalizeSections(PMEMORYMODULE module)
{
int i;
PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(module->headers);
int i;
PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(module->headers);
#ifdef _WIN64
POINTER_TYPE imageOffset = (module->headers->OptionalHeader.ImageBase & 0xffffffff00000000);
POINTER_TYPE imageOffset = (module->headers->OptionalHeader.ImageBase & 0xffffffff00000000);
#else
#define imageOffset 0
#define imageOffset 0
#endif
// loop through all sections and change access flags
for (i=0; i<module->headers->FileHeader.NumberOfSections; i++, section++) {
DWORD protect, oldProtect, size;
int executable = (section->Characteristics & IMAGE_SCN_MEM_EXECUTE) != 0;
int readable = (section->Characteristics & IMAGE_SCN_MEM_READ) != 0;
int writeable = (section->Characteristics & IMAGE_SCN_MEM_WRITE) != 0;
// loop through all sections and change access flags
for (i=0; i<module->headers->FileHeader.NumberOfSections; i++, section++) {
DWORD protect, oldProtect, size;
int executable = (section->Characteristics & IMAGE_SCN_MEM_EXECUTE) != 0;
int readable = (section->Characteristics & IMAGE_SCN_MEM_READ) != 0;
int writeable = (section->Characteristics & IMAGE_SCN_MEM_WRITE) != 0;
if (section->Characteristics & IMAGE_SCN_MEM_DISCARDABLE) {
// section is not needed any more and can safely be freed
VirtualFree((LPVOID)((POINTER_TYPE)section->Misc.PhysicalAddress | imageOffset), section->SizeOfRawData, MEM_DECOMMIT);
continue;
}
if (section->Characteristics & IMAGE_SCN_MEM_DISCARDABLE) {
// section is not needed any more and can safely be freed
VirtualFree((LPVOID)((POINTER_TYPE)section->Misc.PhysicalAddress | imageOffset), section->SizeOfRawData, MEM_DECOMMIT);
continue;
}
// determine protection flags based on characteristics
protect = ProtectionFlags[executable][readable][writeable];
if (section->Characteristics & IMAGE_SCN_MEM_NOT_CACHED) {
protect |= PAGE_NOCACHE;
}
// determine protection flags based on characteristics
protect = ProtectionFlags[executable][readable][writeable];
if (section->Characteristics & IMAGE_SCN_MEM_NOT_CACHED) {
protect |= PAGE_NOCACHE;
}
// determine size of region
size = section->SizeOfRawData;
if (size == 0) {
if (section->Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA) {
size = module->headers->OptionalHeader.SizeOfInitializedData;
} else if (section->Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) {
size = module->headers->OptionalHeader.SizeOfUninitializedData;
}
}
// determine size of region
size = section->SizeOfRawData;
if (size == 0) {
if (section->Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA) {
size = module->headers->OptionalHeader.SizeOfInitializedData;
} else if (section->Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) {
size = module->headers->OptionalHeader.SizeOfUninitializedData;
}
}
if (size > 0) {
// change memory access flags
if (VirtualProtect((LPVOID)((POINTER_TYPE)section->Misc.PhysicalAddress | imageOffset), size, protect, &oldProtect) == 0)
if (size > 0) {
// change memory access flags
if (VirtualProtect((LPVOID)((POINTER_TYPE)section->Misc.PhysicalAddress | imageOffset), size, protect, &oldProtect) == 0)
#ifdef DEBUG_OUTPUT
OutputLastError("Error protecting memory page")
OutputLastError("Error protecting memory page")
#endif
;
}
}
;
}
}
#ifndef _WIN64
#undef imageOffset
#endif
@@ -186,118 +186,118 @@ FinalizeSections(PMEMORYMODULE module)
static void
PerformBaseRelocation(PMEMORYMODULE module, SIZE_T delta)
{
DWORD i;
unsigned char *codeBase = module->codeBase;
DWORD i;
unsigned char *codeBase = module->codeBase;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_BASERELOC);
if (directory->Size > 0) {
PIMAGE_BASE_RELOCATION relocation = (PIMAGE_BASE_RELOCATION) (codeBase + directory->VirtualAddress);
for (; relocation->VirtualAddress > 0; ) {
unsigned char *dest = codeBase + relocation->VirtualAddress;
unsigned short *relInfo = (unsigned short *)((unsigned char *)relocation + IMAGE_SIZEOF_BASE_RELOCATION);
for (i=0; i<((relocation->SizeOfBlock-IMAGE_SIZEOF_BASE_RELOCATION) / 2); i++, relInfo++) {
DWORD *patchAddrHL;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_BASERELOC);
if (directory->Size > 0) {
PIMAGE_BASE_RELOCATION relocation = (PIMAGE_BASE_RELOCATION) (codeBase + directory->VirtualAddress);
for (; relocation->VirtualAddress > 0; ) {
unsigned char *dest = codeBase + relocation->VirtualAddress;
unsigned short *relInfo = (unsigned short *)((unsigned char *)relocation + IMAGE_SIZEOF_BASE_RELOCATION);
for (i=0; i<((relocation->SizeOfBlock-IMAGE_SIZEOF_BASE_RELOCATION) / 2); i++, relInfo++) {
DWORD *patchAddrHL;
#ifdef _WIN64
ULONGLONG *patchAddr64;
ULONGLONG *patchAddr64;
#endif
int type, offset;
int type, offset;
// the upper 4 bits define the type of relocation
type = *relInfo >> 12;
// the lower 12 bits define the offset
offset = *relInfo & 0xfff;
switch (type)
{
case IMAGE_REL_BASED_ABSOLUTE:
// skip relocation
break;
// the upper 4 bits define the type of relocation
type = *relInfo >> 12;
// the lower 12 bits define the offset
offset = *relInfo & 0xfff;
switch (type)
{
case IMAGE_REL_BASED_ABSOLUTE:
// skip relocation
break;
case IMAGE_REL_BASED_HIGHLOW:
// change complete 32 bit address
patchAddrHL = (DWORD *) (dest + offset);
*patchAddrHL += delta;
break;
case IMAGE_REL_BASED_HIGHLOW:
// change complete 32 bit address
patchAddrHL = (DWORD *) (dest + offset);
*patchAddrHL += delta;
break;
#ifdef _WIN64
case IMAGE_REL_BASED_DIR64:
patchAddr64 = (ULONGLONG *) (dest + offset);
*patchAddr64 += delta;
break;
case IMAGE_REL_BASED_DIR64:
patchAddr64 = (ULONGLONG *) (dest + offset);
*patchAddr64 += delta;
break;
#endif
default:
//printf("Unknown relocation: %d\n", type);
break;
}
}
default:
//printf("Unknown relocation: %d\n", type);
break;
}
}
// advance to next relocation block
relocation = (PIMAGE_BASE_RELOCATION) (((char *) relocation) + relocation->SizeOfBlock);
}
}
// advance to next relocation block
relocation = (PIMAGE_BASE_RELOCATION) (((char *) relocation) + relocation->SizeOfBlock);
}
}
}
static int
BuildImportTable(PMEMORYMODULE module)
{
int result=1;
unsigned char *codeBase = module->codeBase;
HCUSTOMMODULE *tmp;
int result=1;
unsigned char *codeBase = module->codeBase;
HCUSTOMMODULE *tmp;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_IMPORT);
if (directory->Size > 0) {
PIMAGE_IMPORT_DESCRIPTOR importDesc = (PIMAGE_IMPORT_DESCRIPTOR) (codeBase + directory->VirtualAddress);
for (; !IsBadReadPtr(importDesc, sizeof(IMAGE_IMPORT_DESCRIPTOR)) && importDesc->Name; importDesc++) {
POINTER_TYPE *thunkRef;
FARPROC *funcRef;
HCUSTOMMODULE handle = module->loadLibrary((LPCSTR) (codeBase + importDesc->Name), module->userdata);
if (handle == NULL) {
SetLastError(ERROR_MOD_NOT_FOUND);
result = 0;
break;
}
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_IMPORT);
if (directory->Size > 0) {
PIMAGE_IMPORT_DESCRIPTOR importDesc = (PIMAGE_IMPORT_DESCRIPTOR) (codeBase + directory->VirtualAddress);
for (; !IsBadReadPtr(importDesc, sizeof(IMAGE_IMPORT_DESCRIPTOR)) && importDesc->Name; importDesc++) {
POINTER_TYPE *thunkRef;
FARPROC *funcRef;
HCUSTOMMODULE handle = module->loadLibrary((LPCSTR) (codeBase + importDesc->Name), module->userdata);
if (handle == NULL) {
SetLastError(ERROR_MOD_NOT_FOUND);
result = 0;
break;
}
tmp = (HCUSTOMMODULE *) realloc(module->modules, (module->numModules+1)*(sizeof(HCUSTOMMODULE)));
if (tmp == NULL) {
module->freeLibrary(handle, module->userdata);
SetLastError(ERROR_OUTOFMEMORY);
result = 0;
break;
}
module->modules = tmp;
tmp = (HCUSTOMMODULE *) realloc(module->modules, (module->numModules+1)*(sizeof(HCUSTOMMODULE)));
if (tmp == NULL) {
module->freeLibrary(handle, module->userdata);
SetLastError(ERROR_OUTOFMEMORY);
result = 0;
break;
}
module->modules = tmp;
module->modules[module->numModules++] = handle;
if (importDesc->OriginalFirstThunk) {
thunkRef = (POINTER_TYPE *) (codeBase + importDesc->OriginalFirstThunk);
funcRef = (FARPROC *) (codeBase + importDesc->FirstThunk);
} else {
// no hint table
thunkRef = (POINTER_TYPE *) (codeBase + importDesc->FirstThunk);
funcRef = (FARPROC *) (codeBase + importDesc->FirstThunk);
}
for (; *thunkRef; thunkRef++, funcRef++) {
if (IMAGE_SNAP_BY_ORDINAL(*thunkRef)) {
*funcRef = module->getProcAddress(handle, (LPCSTR)IMAGE_ORDINAL(*thunkRef), module->userdata);
} else {
PIMAGE_IMPORT_BY_NAME thunkData = (PIMAGE_IMPORT_BY_NAME) (codeBase + (*thunkRef));
*funcRef = module->getProcAddress(handle, (LPCSTR)&thunkData->Name, module->userdata);
}
if (*funcRef == 0) {
result = 0;
break;
}
}
module->modules[module->numModules++] = handle;
if (importDesc->OriginalFirstThunk) {
thunkRef = (POINTER_TYPE *) (codeBase + importDesc->OriginalFirstThunk);
funcRef = (FARPROC *) (codeBase + importDesc->FirstThunk);
} else {
// no hint table
thunkRef = (POINTER_TYPE *) (codeBase + importDesc->FirstThunk);
funcRef = (FARPROC *) (codeBase + importDesc->FirstThunk);
}
for (; *thunkRef; thunkRef++, funcRef++) {
if (IMAGE_SNAP_BY_ORDINAL(*thunkRef)) {
*funcRef = module->getProcAddress(handle, (LPCSTR)IMAGE_ORDINAL(*thunkRef), module->userdata);
} else {
PIMAGE_IMPORT_BY_NAME thunkData = (PIMAGE_IMPORT_BY_NAME) (codeBase + (*thunkRef));
*funcRef = module->getProcAddress(handle, (LPCSTR)&thunkData->Name, module->userdata);
}
if (*funcRef == 0) {
result = 0;
break;
}
}
if (!result) {
module->freeLibrary(handle, module->userdata);
SetLastError(ERROR_PROC_NOT_FOUND);
break;
}
}
}
if (!result) {
module->freeLibrary(handle, module->userdata);
SetLastError(ERROR_PROC_NOT_FOUND);
break;
}
}
}
return result;
return result;
}
static HCUSTOMMODULE _LoadLibrary(LPCSTR filename, void *userdata)
@@ -331,33 +331,33 @@ HMEMORYMODULE MemoryLoadLibraryEx(const void *data,
CustomFreeLibraryFunc freeLibrary,
void *userdata)
{
PMEMORYMODULE result;
PIMAGE_DOS_HEADER dos_header;
PIMAGE_NT_HEADERS old_header;
unsigned char *code, *headers;
SIZE_T locationDelta;
DllEntryProc DllEntry;
BOOL successfull;
PMEMORYMODULE result;
PIMAGE_DOS_HEADER dos_header;
PIMAGE_NT_HEADERS old_header;
unsigned char *code, *headers;
SIZE_T locationDelta;
DllEntryProc DllEntry;
BOOL successfull;
dos_header = (PIMAGE_DOS_HEADER)data;
if (dos_header->e_magic != IMAGE_DOS_SIGNATURE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
dos_header = (PIMAGE_DOS_HEADER)data;
if (dos_header->e_magic != IMAGE_DOS_SIGNATURE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
old_header = (PIMAGE_NT_HEADERS)&((const unsigned char *)(data))[dos_header->e_lfanew];
if (old_header->Signature != IMAGE_NT_SIGNATURE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
old_header = (PIMAGE_NT_HEADERS)&((const unsigned char *)(data))[dos_header->e_lfanew];
if (old_header->Signature != IMAGE_NT_SIGNATURE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
// reserve memory for image of library
// XXX: is it correct to commit the complete memory region at once?
// reserve memory for image of library
// XXX: is it correct to commit the complete memory region at once?
// calling DllEntry raises an exception if we don't...
code = (unsigned char *)VirtualAlloc((LPVOID)(old_header->OptionalHeader.ImageBase),
old_header->OptionalHeader.SizeOfImage,
MEM_RESERVE | MEM_COMMIT,
PAGE_READWRITE);
code = (unsigned char *)VirtualAlloc((LPVOID)(old_header->OptionalHeader.ImageBase),
old_header->OptionalHeader.SizeOfImage,
MEM_RESERVE | MEM_COMMIT,
PAGE_READWRITE);
if (code == NULL) {
// try to allocate memory at arbitrary position
@@ -365,155 +365,155 @@ HMEMORYMODULE MemoryLoadLibraryEx(const void *data,
old_header->OptionalHeader.SizeOfImage,
MEM_RESERVE | MEM_COMMIT,
PAGE_READWRITE);
if (code == NULL) {
SetLastError(ERROR_OUTOFMEMORY);
return NULL;
}
}
if (code == NULL) {
SetLastError(ERROR_OUTOFMEMORY);
return NULL;
}
}
result = (PMEMORYMODULE)HeapAlloc(GetProcessHeap(), 0, sizeof(MEMORYMODULE));
if (result == NULL) {
SetLastError(ERROR_OUTOFMEMORY);
VirtualFree(code, 0, MEM_RELEASE);
return NULL;
}
result = (PMEMORYMODULE)HeapAlloc(GetProcessHeap(), 0, sizeof(MEMORYMODULE));
if (result == NULL) {
SetLastError(ERROR_OUTOFMEMORY);
VirtualFree(code, 0, MEM_RELEASE);
return NULL;
}
result->codeBase = code;
result->numModules = 0;
result->modules = NULL;
result->initialized = 0;
result->loadLibrary = loadLibrary;
result->getProcAddress = getProcAddress;
result->freeLibrary = freeLibrary;
result->userdata = userdata;
result->codeBase = code;
result->numModules = 0;
result->modules = NULL;
result->initialized = 0;
result->loadLibrary = loadLibrary;
result->getProcAddress = getProcAddress;
result->freeLibrary = freeLibrary;
result->userdata = userdata;
// commit memory for headers
headers = (unsigned char *)VirtualAlloc(code,
old_header->OptionalHeader.SizeOfHeaders,
MEM_COMMIT,
PAGE_READWRITE);
// copy PE header to code
memcpy(headers, dos_header, dos_header->e_lfanew + old_header->OptionalHeader.SizeOfHeaders);
result->headers = (PIMAGE_NT_HEADERS)&((const unsigned char *)(headers))[dos_header->e_lfanew];
// commit memory for headers
headers = (unsigned char *)VirtualAlloc(code,
old_header->OptionalHeader.SizeOfHeaders,
MEM_COMMIT,
PAGE_READWRITE);
// copy PE header to code
memcpy(headers, dos_header, dos_header->e_lfanew + old_header->OptionalHeader.SizeOfHeaders);
result->headers = (PIMAGE_NT_HEADERS)&((const unsigned char *)(headers))[dos_header->e_lfanew];
// update position
result->headers->OptionalHeader.ImageBase = (POINTER_TYPE)code;
// update position
result->headers->OptionalHeader.ImageBase = (POINTER_TYPE)code;
// copy sections from DLL file block to new memory location
CopySections(data, old_header, result);
// copy sections from DLL file block to new memory location
CopySections(data, old_header, result);
// adjust base address of imported data
locationDelta = (SIZE_T)(code - old_header->OptionalHeader.ImageBase);
if (locationDelta != 0) {
PerformBaseRelocation(result, locationDelta);
}
// adjust base address of imported data
locationDelta = (SIZE_T)(code - old_header->OptionalHeader.ImageBase);
if (locationDelta != 0) {
PerformBaseRelocation(result, locationDelta);
}
// load required dlls and adjust function table of imports
if (!BuildImportTable(result)) {
goto error;
}
// load required dlls and adjust function table of imports
if (!BuildImportTable(result)) {
goto error;
}
// mark memory pages depending on section headers and release
// sections that are marked as "discardable"
FinalizeSections(result);
// mark memory pages depending on section headers and release
// sections that are marked as "discardable"
FinalizeSections(result);
// get entry point of loaded library
if (result->headers->OptionalHeader.AddressOfEntryPoint != 0) {
DllEntry = (DllEntryProc) (code + result->headers->OptionalHeader.AddressOfEntryPoint);
// notify library about attaching to process
successfull = (*DllEntry)((HINSTANCE)code, DLL_PROCESS_ATTACH, 0);
if (!successfull) {
SetLastError(ERROR_DLL_INIT_FAILED);
goto error;
}
result->initialized = 1;
}
// get entry point of loaded library
if (result->headers->OptionalHeader.AddressOfEntryPoint != 0) {
DllEntry = (DllEntryProc) (code + result->headers->OptionalHeader.AddressOfEntryPoint);
// notify library about attaching to process
successfull = (*DllEntry)((HINSTANCE)code, DLL_PROCESS_ATTACH, 0);
if (!successfull) {
SetLastError(ERROR_DLL_INIT_FAILED);
goto error;
}
result->initialized = 1;
}
return (HMEMORYMODULE)result;
return (HMEMORYMODULE)result;
error:
// cleanup
MemoryFreeLibrary(result);
return NULL;
// cleanup
MemoryFreeLibrary(result);
return NULL;
}
FARPROC MemoryGetProcAddress(HMEMORYMODULE module, const char *name)
{
unsigned char *codeBase = ((PMEMORYMODULE)module)->codeBase;
int idx=-1;
DWORD i, *nameRef;
WORD *ordinal;
PIMAGE_EXPORT_DIRECTORY exports;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY((PMEMORYMODULE)module, IMAGE_DIRECTORY_ENTRY_EXPORT);
if (directory->Size == 0) {
// no export table found
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
unsigned char *codeBase = ((PMEMORYMODULE)module)->codeBase;
int idx=-1;
DWORD i, *nameRef;
WORD *ordinal;
PIMAGE_EXPORT_DIRECTORY exports;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY((PMEMORYMODULE)module, IMAGE_DIRECTORY_ENTRY_EXPORT);
if (directory->Size == 0) {
// no export table found
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
exports = (PIMAGE_EXPORT_DIRECTORY) (codeBase + directory->VirtualAddress);
if (exports->NumberOfNames == 0 || exports->NumberOfFunctions == 0) {
// DLL doesn't export anything
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
exports = (PIMAGE_EXPORT_DIRECTORY) (codeBase + directory->VirtualAddress);
if (exports->NumberOfNames == 0 || exports->NumberOfFunctions == 0) {
// DLL doesn't export anything
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
// search function name in list of exported names
nameRef = (DWORD *) (codeBase + exports->AddressOfNames);
ordinal = (WORD *) (codeBase + exports->AddressOfNameOrdinals);
for (i=0; i<exports->NumberOfNames; i++, nameRef++, ordinal++) {
if (stricmp(name, (const char *) (codeBase + (*nameRef))) == 0) {
idx = *ordinal;
break;
}
}
// search function name in list of exported names
nameRef = (DWORD *) (codeBase + exports->AddressOfNames);
ordinal = (WORD *) (codeBase + exports->AddressOfNameOrdinals);
for (i=0; i<exports->NumberOfNames; i++, nameRef++, ordinal++) {
if (stricmp(name, (const char *) (codeBase + (*nameRef))) == 0) {
idx = *ordinal;
break;
}
}
if (idx == -1) {
// exported symbol not found
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
if (idx == -1) {
// exported symbol not found
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
if ((DWORD)idx > exports->NumberOfFunctions) {
// name <-> ordinal number don't match
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
if ((DWORD)idx > exports->NumberOfFunctions) {
// name <-> ordinal number don't match
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
// AddressOfFunctions contains the RVAs to the "real" functions
return (FARPROC) (codeBase + (*(DWORD *) (codeBase + exports->AddressOfFunctions + (idx*4))));
// AddressOfFunctions contains the RVAs to the "real" functions
return (FARPROC) (codeBase + (*(DWORD *) (codeBase + exports->AddressOfFunctions + (idx*4))));
}
void MemoryFreeLibrary(HMEMORYMODULE mod)
{
int i;
PMEMORYMODULE module = (PMEMORYMODULE)mod;
int i;
PMEMORYMODULE module = (PMEMORYMODULE)mod;
if (module != NULL) {
if (module->initialized != 0) {
// notify library about detaching from process
DllEntryProc DllEntry = (DllEntryProc) (module->codeBase + module->headers->OptionalHeader.AddressOfEntryPoint);
(*DllEntry)((HINSTANCE)module->codeBase, DLL_PROCESS_DETACH, 0);
module->initialized = 0;
}
if (module != NULL) {
if (module->initialized != 0) {
// notify library about detaching from process
DllEntryProc DllEntry = (DllEntryProc) (module->codeBase + module->headers->OptionalHeader.AddressOfEntryPoint);
(*DllEntry)((HINSTANCE)module->codeBase, DLL_PROCESS_DETACH, 0);
module->initialized = 0;
}
if (module->modules != NULL) {
// free previously opened libraries
for (i=0; i<module->numModules; i++) {
if (module->modules[i] != NULL) {
module->freeLibrary(module->modules[i], module->userdata);
}
}
if (module->modules != NULL) {
// free previously opened libraries
for (i=0; i<module->numModules; i++) {
if (module->modules[i] != NULL) {
module->freeLibrary(module->modules[i], module->userdata);
}
}
free(module->modules);
}
free(module->modules);
}
if (module->codeBase != NULL) {
// release memory of library
VirtualFree(module->codeBase, 0, MEM_RELEASE);
}
if (module->codeBase != NULL) {
// release memory of library
VirtualFree(module->codeBase, 0, MEM_RELEASE);
}
HeapFree(GetProcessHeap(), 0, module);
}
HeapFree(GetProcessHeap(), 0, module);
}
}
example/DllLoader/DllLoader.cpp
+40 -40
View File
@@ -12,59 +12,59 @@ typedef int (*addNumberProc)(int, int);
void LoadFromFile(void)
{
addNumberProc addNumber;
HINSTANCE handle = LoadLibrary(DLL_FILE);
if (handle == NULL)
return;
addNumberProc addNumber;
HINSTANCE handle = LoadLibrary(DLL_FILE);
if (handle == NULL)
return;
addNumber = (addNumberProc)GetProcAddress(handle, "addNumbers");
printf("From file: %d\n", addNumber(1, 2));
FreeLibrary(handle);
addNumber = (addNumberProc)GetProcAddress(handle, "addNumbers");
printf("From file: %d\n", addNumber(1, 2));
FreeLibrary(handle);
}
void LoadFromMemory(void)
{
FILE *fp;
unsigned char *data=NULL;
size_t size;
HMEMORYMODULE module;
addNumberProc addNumber;
fp = fopen(DLL_FILE, "rb");
if (fp == NULL)
{
printf("Can't open DLL file \"%s\".", DLL_FILE);
goto exit;
}
FILE *fp;
unsigned char *data=NULL;
size_t size;
HMEMORYMODULE module;
addNumberProc addNumber;
fp = fopen(DLL_FILE, "rb");
if (fp == NULL)
{
printf("Can't open DLL file \"%s\".", DLL_FILE);
goto exit;
}
fseek(fp, 0, SEEK_END);
size = ftell(fp);
data = (unsigned char *)malloc(size);
fseek(fp, 0, SEEK_SET);
fread(data, 1, size, fp);
fclose(fp);
fseek(fp, 0, SEEK_END);
size = ftell(fp);
data = (unsigned char *)malloc(size);
fseek(fp, 0, SEEK_SET);
fread(data, 1, size, fp);
fclose(fp);
module = MemoryLoadLibrary(data);
if (module == NULL)
{
printf("Can't load library from memory.\n");
goto exit;
}
module = MemoryLoadLibrary(data);
if (module == NULL)
{
printf("Can't load library from memory.\n");
goto exit;
}
addNumber = (addNumberProc)MemoryGetProcAddress(module, "addNumbers");
printf("From memory: %d\n", addNumber(1, 2));
MemoryFreeLibrary(module);
addNumber = (addNumberProc)MemoryGetProcAddress(module, "addNumbers");
printf("From memory: %d\n", addNumber(1, 2));
MemoryFreeLibrary(module);
exit:
if (data)
free(data);
if (data)
free(data);
}
int main(int argc, char* argv[])
{
LoadFromFile();
printf("\n\n");
LoadFromMemory();
return 0;
LoadFromFile();
printf("\n\n");
LoadFromMemory();
return 0;
}
example/SampleDLL/SampleDLL.cpp
+1 -1
View File
@@ -4,7 +4,7 @@ extern "C" {
SAMPLEDLL_API int addNumbers(int a, int b)
{
return a + b;
return a + b;
}
}