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//////////////////////////////////////////////////////////////////////////////
//
// Detour Test Program (wrotei.cpp of wrotei.dll)
//
// Microsoft Research Detours Package
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// An example dynamically detouring a function.
//
#include <stdio.h>
//////////////////////////////////////////////////////////////////////////////
//
// WARNING:
//
// CINTERFACE must be defined so that the lpVtbl pointer is visible
// on COM interfaces. However, once we've defined it, we must use
// coding conventions when accessing interface members, for example:
// i->lpVtbl->Write
// instead of the C++ syntax:
// i->Write.
// We must also pass the implicit "this" parameter explicitly:
// i->lpVtbl->Write(i, pb, 0, NULL)
// instead of the C++ syntax:
// i->Write(pb, 0, NULL)
//
#define CINTERFACE
#include <ole2.h>
#include <windows.h>
#include <detours.h>
//////////////////////////////////////////////////////////////////////////////
//
LONG dwWrote = 0;
static int (WINAPI * TrueEntryPoint)(VOID) = NULL;
static int (WINAPI * RawEntryPoint)(VOID) = NULL;
//////////////////////////////////////////////////////////////////////////////
//
HRESULT (STDMETHODCALLTYPE *RealIStreamWrite)(IStream * This,
const void *pv,
ULONG cb,
ULONG *pcbWritten) = NULL;
HRESULT STDMETHODCALLTYPE MineIStreamWrite(IStream * This,
const void *pv,
ULONG cb,
ULONG *pcbWritten)
{
HRESULT hr;
ULONG cbWritten = 0;
if (pcbWritten == NULL) {
pcbWritten = &cbWritten;
}
hr = RealIStreamWrite(This, pv, cb, pcbWritten);
for (;;) {
LONG dwOld = dwWrote;
LONG dwNew = dwOld + *pcbWritten;
if (InterlockedCompareExchange(&dwWrote, dwNew, dwOld) == dwOld) {
break;
}
}
return hr;
}
//////////////////////////////////////////////////////////////////////////////
//
int WINAPI TimedEntryPoint(VOID)
{
// We couldn't call CoInitializeEx in DllMain,
// so we detour the vtable entries here...
LONG error;
LPSTREAM pStream = NULL;
// Create a temporary object so we can get a vtable.
CreateStreamOnHGlobal(NULL, TRUE, &pStream);
// Apply the detour to the vtable.
DetourTransactionBegin();
DetourUpdateThread(GetCurrentThread());
if (pStream != NULL) {
RealIStreamWrite = pStream->lpVtbl->Write;
DetourAttach(&(PVOID&)RealIStreamWrite, MineIStreamWrite);
}
error = DetourTransactionCommit();
if (pStream != NULL) {
pStream->lpVtbl->Release(pStream);
pStream = NULL;
}
if (error == NO_ERROR) {
printf("wrotei" DETOURS_STRINGIFY(DETOURS_BITS) ".dll:"
" Detoured IStream::Wrote() from OnHGlobal.\n");
}
else {
printf("wrotei" DETOURS_STRINGIFY(DETOURS_BITS) ".dll:"
" Error detouring IStram::Wrote(): %ld\n", error);
}
printf("wrotei" DETOURS_STRINGIFY(DETOURS_BITS) ".dll:"
" Calling EntryPoint\n\n");
fflush(stdout);
return TrueEntryPoint();
}
BOOL WINAPI DllMain(HINSTANCE hinst, DWORD dwReason, LPVOID reserved)
{
LONG error;
(void)hinst;
(void)reserved;
if (DetourIsHelperProcess()) {
return TRUE;
}
if (dwReason == DLL_PROCESS_ATTACH) {
DetourRestoreAfterWith();
printf("wrotei" DETOURS_STRINGIFY(DETOURS_BITS) ".dll:"
" Starting.\n");
fflush(stdout);
// NB: DllMain can't call LoadLibrary, so we hook the app entry point.
TrueEntryPoint = (int (WINAPI *)(VOID))DetourGetEntryPoint(NULL);
RawEntryPoint = TrueEntryPoint;
DetourTransactionBegin();
DetourUpdateThread(GetCurrentThread());
DetourAttach(&(PVOID&)TrueEntryPoint, TimedEntryPoint);
error = DetourTransactionCommit();
if (error == NO_ERROR) {
printf("wrotei" DETOURS_STRINGIFY(DETOURS_BITS) ".dll:"
" Detoured EntryPoint().\n");
}
else {
printf("wrotei" DETOURS_STRINGIFY(DETOURS_BITS) ".dll:"
" Error detouring EntryPoint(): %ld\n", error);
}
}
else if (dwReason == DLL_PROCESS_DETACH) {
DetourTransactionBegin();
DetourUpdateThread(GetCurrentThread());
if (RealIStreamWrite != NULL) {
DetourDetach(&(PVOID&)RealIStreamWrite, (PVOID)MineIStreamWrite);
}
DetourDetach(&(PVOID&)TrueEntryPoint, TimedEntryPoint);
error = DetourTransactionCommit();
printf("wrotei" DETOURS_STRINGIFY(DETOURS_BITS) ".dll:"
" Removed IStream::Wrote() detours (%ld), wrote %ld bytes.\n",
error, dwWrote);
fflush(stdout);
}
return TRUE;
}
//
///////////////////////////////////////////////////////////////// End of File.
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