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C語言內(nèi)嵌匯編API內(nèi)存搜索引擎實(shí)例

更新時間：2014年10月24日 11:20:02 投稿：shichen2014

這篇文章主要介紹了C語言內(nèi)嵌匯編API內(nèi)存搜索引擎實(shí)例,涉及匯編語言與內(nèi)存相關(guān)操作,需要的朋友可以參考下

本文實(shí)例講述了C語言內(nèi)嵌匯編API內(nèi)存搜索引擎的方法，分享給大家供大家參考。具體實(shí)現(xiàn)方法如下：

// apisearchEngine.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <Windows.h>

DWORD __stdcall GetStrLengthA(char* szName)
{
    _asm
    {
        push edi
        push ebx
        mov eax, szName
        mov edi, eax
        mov ebx, eax
        xor al, al

lstrscan:
        scas byte ptr [edi]          //字符掃描法檢查字符串指針長度
        jnz lstrscan
        dec edi
        sub edi, ebx
        mov eax, edi
        pop ebx
        pop edi

    }
}

DWORD __stdcall CalcBufferCRC(char* lpBuffer)
{
    _asm
    {
        push ebx
        push edi
        push ecx
        push ebp
        mov ebx, lpBuffer
        push ebx
        call GetStrLengthA
        mov edi, eax
        shr edi, 2
        xor ecx, ecx
loopBegin:
        dec edi
        jl loopOver
        xor ecx, dword ptr [ebx]
        add ebx, 4
        jmp loopBegin
loopOver:
        mov eax, ecx
        pop ebp
        pop ecx
        pop edi
        pop ebx
    }
}

DWORD __stdcall GetProcAddressA(HANDLE hModule, DWORD dwExportCRC)
{
    //DWORD lpProcNameCRC = ;
    DWORD dwProcNumber;
    LPVOID pProcAddress, pProcNameAddress, pProcIndexAddress;
    _asm
    {
        push ebx
        push esi

        mov eax, hModule
        mov edx,dwExportCRC      // edx=函數(shù)名CRC32
        mov ebx, eax                // ebx=基址
        mov eax, [ebx+0x3c]          // eax=文件頭偏移
        mov esi, [ebx+eax+0x78]      // esi=輸出表偏移,文件頭+可選頭的長度=$78
        lea esi, [ebx+esi+0x18]      // esi=函數(shù)名數(shù)量 = 函數(shù)數(shù)量 [ebx+esi+$14]
        lods dword ptr ds:[esi]
        mov dwProcNumber, eax       // eax=函數(shù)名數(shù)量
        lods dword ptr ds:[esi]
        mov pProcAddress, eax       // eax=函數(shù)偏移量
        lods dword ptr ds:[esi]
        mov pProcNameAddress, eax   // eax=函數(shù)名偏移量
        lods dword ptr ds:[esi]
        mov pProcIndexAddress, eax // eax=序列號偏移量
        mov edx, dwProcNumber       // edx=遍歷次數(shù)
LoopBegin:
        xor eax, eax                // Result = 0
        dec edx
        jl LoopEnd
        mov eax, pProcNameAddress
        add eax, ebx                // eax=函數(shù)名基地址
        mov eax, dword ptr ds:[eax+edx*4]
        add eax, ebx                // eax=遍歷函數(shù)名
        push eax
        call CalcBufferCRC
        cmp eax, dwExportCRC      // 對比CRC32
        jnz LoopBegin
        shl edx, 1
        add edx, pProcIndexAddress // 函數(shù)基序列
        movzx eax, word ptr ss:[edx+ebx]
        shl eax, 2
        add eax, pProcAddress       // 函數(shù)基地址
        mov eax, [eax+ebx]
        add eax, ebx                // Result = 函數(shù)地址
LoopEnd:
        pop esi
        pop ebx

    }
}

DWORD __stdcall GetKernel32Module()
{
    _asm
    {
        PUSH    EBP
        XOR     ECX, ECX
        //MOV     ESI, [FS:ECX + 0x30]        ; ESI = &(PEB) ([FS:0x30])
        MOV     ESI, FS:[0X30]
        MOV     ESI, [ESI + 0x0C]           ; ESI = PEB->Ldr
        MOV     ESI, [ESI + 0x1C]           ; ESI = PEB->Ldr.InInitOrder
next_module:
        MOV     EBP, [ESI + 0x08]           ; EBP = InInitOrder[X].base_address
        MOV     EDI, [ESI + 0x20]           ; EBP = InInitOrder[X].module_name (unicode)
        MOV     ESI, [ESI]                  ; ESI = InInitOrder[X].flink (next module)
        CMP     [EDI + 12*2], CL            ; modulename[12] == 0 ?
        JNE     next_module                 ; No: try next module.
        MOV     EAX, EBP
        POP     EBP
    }
}
int main(int argc, char* argv[])
{
    printf("write by xiaoju !\n");
    printf("*****************\n");
    DWORD dwBaseKernel32 = GetKernel32Module();
    printf("Kernel32的模塊地址:%08x\n",dwBaseKernel32);

    DWORD LoadLibraryCRC32= CalcBufferCRC("LoadLibraryA") ;
    printf("LoadLibraryA的CRC值(靜態(tài)寫到程序中):%08x\n\n", LoadLibraryCRC32);

    DWORD dwAddrLoadLibrary = GetProcAddressA((HANDLE)dwBaseKernel32, 0x577a7461);
    printf("在程序中動態(tài)得到的LoadLibraryA的地址:%08x\n", dwAddrLoadLibrary);
    getchar();
    return 0;
}