Detours Hook memcpy Not Working

问题

I have programmed hook for memcpy but it only calls on the end of the program.

Not each time, when was function called. Also the adresses are different.

This is the hook:

#include <windows.h>
#include<iostream>
#include "detours\detours.h"

#pragma comment( lib, "msvcrt.lib" )
#pragma comment( lib, "detours.lib" )
//#pragma comment( lib, "detoured.lib" )

//int (WINAPI *Real_Send)(SOCKET s, const char *buf, int len, int flags) = send;
//int WINAPI Mine_Send(SOCKET s, const char* buf, int len, int flags);

//void *memcpy(void *dest,const void *src,size_t count);
void *(*Real_Memcpy)(void *dest, const void *src, size_t count) = memcpy;
void *(*Real_Memcpy_add)(void *dest, const void *src, size_t count) = &memcpy;
void * Mine_Memcpy(void *dest, const void *src, size_t count);


void* Mine_Memcpy(void *dest, const void *src, size_t count) {
    HANDLE hFile;
    BOOL bErrorFlag = FALSE;
    DWORD dwBytesWritten = 0;
    char cislo[24]; // just big enough

    sprintf(cislo,"0x%08x", Real_Memcpy_add);

    MessageBoxA(0, cislo, cislo, 0);
    MessageBoxA(0, (char *)src, (char *)src, 0);


    /*hFile = CreateFileA("C:\\Users\\edit\\Documents\\test.txt",                // name of the write
        FILE_APPEND_DATA,          // open for writing
        0,                      // do not share
        NULL,                   // default security
        OPEN_ALWAYS,             // create new file only
        FILE_ATTRIBUTE_NORMAL,  // normal file
        NULL);
    if (hFile == INVALID_HANDLE_VALUE)
    {
        MessageBoxA(0, "Canot open file", "Error", 0);
    }
    bErrorFlag = WriteFile(
        hFile,           // open file handle
        src,      // start of data to write
        count,  // number of bytes to write
        &dwBytesWritten, // number of bytes that were written
        NULL);            // no overlapped structure
    if (FALSE == bErrorFlag)
    {
        MessageBoxA(0, "canot write to file", "Error", 0);
    }
    const char * str = "\r\n";
    bErrorFlag = WriteFile(
        hFile,           // open file handle
        str,      // start of data to write
        strlen(str) + 1,  // number of bytes to write
        &dwBytesWritten, // number of bytes that were written
        NULL);            // no overlapped structure
    if (FALSE == bErrorFlag)
    {
        MessageBoxA(0, "canot write to file", "Error", 0);
    }




    CloseHandle(hFile);

    return Real_Memcpy(dest, src, count);*/
    return 0x0;
}


BOOL WINAPI DllMain(HINSTANCE, DWORD dwReason, LPVOID) {
    switch (dwReason) {
    case DLL_PROCESS_ATTACH:
        DetourTransactionBegin();
        DetourUpdateThread(GetCurrentThread());
        DetourAttach(&(PVOID &)Real_Memcpy, Mine_Memcpy);
        DetourTransactionCommit();
        break;

    case DLL_PROCESS_DETACH:
        DetourTransactionBegin();
        DetourUpdateThread(GetCurrentThread());
        DetourDetach(&(PVOID &)Real_Memcpy, Mine_Memcpy);
        DetourTransactionCommit();
        break;
    }

    return TRUE;
}

This is a program which I want to hook, but hooks only work in end of program, happens only once:

#include<iostream>
#include<cstring>
#include<stdio.h>
using namespace std;
int main(){
    char asd[20];
    cout << "copy" << endl;
    cin.get();
    cin.get();
    int a = strlen("Neviem co mam");
    cout << a << endl;
    void *(*p_fun)(void *dest, const void *src, size_t count) = &memcpy;
    printf("0x%p\n",p_fun);

    memcpy(asd,"Neviem co mam",a+1);
    cout << "after" << endl;
    cout << asd << endl;
    memcpy(asd,"Neviem co mam",a+1);
    cout << "after" << endl;
    cout << asd << endl;
    memcpy(asd,"Neviem co mam",a+1);
    cout << "after" << endl;
    cout << asd << endl;

    cin.get();
    cin.get();

}

I want to run the hook each time, when memcpy is called and show goof values.

来源：https://stackoverflow.com/questions/33488648/detours-hook-memcpy-not-working

标签

c++

hook

memcpy

detours