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#include "stdafx.h"
#include "DLLHelper.h"
#include "PatternScanner.h"
#include <algorithm>
#include <stdexcept>
#include <sstream>
#include <string>
#include <vector>
#include <Windows.h>
static bool map_file_loadlib(SymbolResolver& symres, MODULE_DATA& module, PVOID * const buffer,
SIZE_T * const size, PVOID const user_ptr);
static bool map_file_loadlib_cleanup(SymbolResolver& symres, MODULE_DATA& module, PVOID buffer,
PVOID const user_ptr);
const struct map_file_data map_loadlib = map_file_data(map_file_loadlib, map_file_loadlib_cleanup, true);
bool map_file_loadlib(SymbolResolver& symres, MODULE_DATA& module, PVOID * const buffer,
SIZE_T * const size, PVOID const user_ptr)
{
HMODULE hMod;
struct loadlib_user_data * const user_data = (struct loadlib_user_data * const) user_ptr;
std::vector<DLL_DIRECTORY_COOKIE> dir_cookies;
if (user_data) {
if (user_data->additionalDllSearchDirectories.size() == 1) {
SetDllDirectoryA(user_data->additionalDllSearchDirectories[0].c_str());
}
else {
for (auto& searchDir : user_data->additionalDllSearchDirectories) {
dir_cookies.push_back(AddDllDirectory(std::wstring(searchDir.begin(),
searchDir.end()).c_str()));
}
if (!SetDefaultDllDirectories(LOAD_LIBRARY_SEARCH_USER_DIRS)) {
return false;
}
}
}
hMod = symres.LoadLibrary(module.FullDllPath);
if (user_data) {
if (dir_cookies.size() > 1) {
SetDllDirectoryA("");
}
else
for (auto& searchDir : dir_cookies) {
RemoveDllDirectory(searchDir);
}
}
if (!hMod) {
*buffer = NULL;
*size = 0;
return false;
}
else {
*buffer = hMod;
*size = module.SizeOfImage;
return true;
}
}
bool map_file_loadlib_cleanup(SymbolResolver& symres, MODULE_DATA& module, PVOID buffer, PVOID const user_ptr)
{
return symres.FreeLibrary((HMODULE)buffer);
}
PatternScanner::PatternScanner(SymbolResolver& symres,
struct map_file_data const * const mfd, PVOID map_file_user_data)
: m_symbolResolver(symres), mfd(mfd), map_file_user_data(map_file_user_data)
{
if (!mfd) {
throw std::runtime_error("MapFileData was NULL");
}
}
PatternScanner::~PatternScanner()
{
}
static void findAndReplaceAll(std::string& data, const char * const search, const char * const replace)
{
std::string toSearch(search);
std::string replaceStr(replace);
size_t pos = data.find(toSearch);
while (pos != std::string::npos)
{
data.replace(pos, toSearch.size(), replaceStr);
pos = data.find(toSearch, pos + replaceStr.size());
}
}
bool PatternScanner::checkPattern(MODULE_DATA& module, const char * const pattern, std::string& result)
{
const char * const hexalnum = "0123456789abcdefABCDEF ?";
std::string str_pattern(pattern);
std::size_t found = str_pattern.find_first_not_of(hexalnum);
if (found != std::string::npos) {
std::stringstream err_str;
err_str << "Found an invalid character at " << found
<< " (allowed characters: \"" << hexalnum << "\")";
throw std::runtime_error(err_str.str());
return false;
}
findAndReplaceAll(str_pattern, " ", "");
if (str_pattern.length() % 2 != 0) {
std::stringstream err_str;
err_str << "Pattern length is not a multiple of 2";
throw std::runtime_error(err_str.str());
return false;
}
result = str_pattern;
return true;
}
#include <iostream>
bool PatternScanner::doScan(std::string& pattern, UINT8 *buf, SIZE_T size, std::vector<UINT64>& foundOffsets)
{
//std::wcout << "BLAAAAAAAAAAAAA" << std::endl;
//std::wstring bla(str_pattern.begin(), str_pattern.end());
//std::wcout << bla << std::endl;
std::cout << pattern << std::endl;
return false;
}
bool PatternScanner::Scan(MODULE_DATA& module, const char * const pattern)
{
bool result;
std::string validPattern;
IMAGE_NT_HEADERS *ntHeader;
IMAGE_SECTION_HEADER *secHeader;
UINT8 *mappedBuffer = NULL;
SIZE_T mappedSize = 0;
std::vector<UINT64> foundOffsets;
if (!checkPattern(module, pattern, validPattern)) {
return false;
}
if (!mfd->mapfile(m_symbolResolver, module, (PVOID *)&mappedBuffer, &mappedSize, map_file_user_data))
{
return false;
}
if (mfd->in_memory_module) {
if (!VerifyPeHeader(mappedBuffer, mappedSize, &ntHeader) || !ntHeader) {
return false;
}
DWORD nBytes = 0, virtualSize;
secHeader = IMAGE_FIRST_SECTION(ntHeader);
for (SIZE_T i = 0; ntHeader->FileHeader.NumberOfSections; i++)
{
if (nBytes >= ntHeader->OptionalHeader.SizeOfImage)
break;
std::cout << "Sec: " << secHeader->Name << std::endl;
virtualSize = secHeader->VirtualAddress;
secHeader++;
virtualSize = secHeader->VirtualAddress - virtualSize;
nBytes += virtualSize;
}
result = false;
}
else {
result = doScan(validPattern, mappedBuffer, mappedSize, foundOffsets);
}
if (!mfd->mapcleanup(m_symbolResolver, module, mappedBuffer, map_file_user_data))
{
return false;
}
return result;
}
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