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#include "Memory.h"
#include <psapi.h>
#include <tlhelp32.h>
#include <iostream>
#include <string>
#include <cassert>
#undef PROCESSENTRY32
#undef Process32Next
Memory::Memory(const std::wstring& processName) : _processName(processName) {}
Memory::~Memory() {
if (_threadActive) {
_threadActive = false;
_thread.join();
}
if (_handle != nullptr) {
for (uintptr_t addr : _allocations) VirtualFreeEx(_handle, (void*)addr, 0, MEM_RELEASE);
CloseHandle(_handle);
}
}
void Memory::StartHeartbeat(HWND window, std::chrono::milliseconds beat) {
if (_threadActive) return;
_threadActive = true;
_thread = std::thread([sharedThis = shared_from_this(), window, beat]{
while (sharedThis->_threadActive) {
sharedThis->Heartbeat(window);
std::this_thread::sleep_for(beat);
}
});
_thread.detach();
}
void Memory::Heartbeat(HWND window) {
if (!_handle && !Initialize()) {
// Couldn't initialize, definitely not running
PostMessage(window, WM_COMMAND, HEARTBEAT, (LPARAM)ProcStatus::NotRunning);
return;
}
DWORD exitCode = 0;
assert(_handle);
GetExitCodeProcess(_handle, &exitCode);
if (exitCode != STILL_ACTIVE) {
// Process has exited, clean up.
_computedAddresses.clear();
_handle = NULL;
PostMessage(window, WM_COMMAND, HEARTBEAT, (LPARAM)ProcStatus::NotRunning);
return;
}
#if GLOBALS == 0x5B28C0
int currentFrame = ReadData<int>({0x5BE3B0}, 1)[0];
#elif GLOBALS == 0x62D0A0
int currentFrame = ReadData<int>({0x63954C}, 1)[0];
#endif
int frameDelta = currentFrame - _previousFrame;
_previousFrame = currentFrame;
if (frameDelta < 0 && currentFrame < 250) {
// Some addresses (e.g. Entity Manager) may get re-allocated on newgame.
_computedAddresses.clear();
PostMessage(window, WM_COMMAND, HEARTBEAT, (LPARAM)ProcStatus::NewGame);
return;
}
// TODO: Some way to return ProcStatus::Randomized vs ProcStatus::NotRandomized vs ProcStatus::DeRandomized;
PostMessage(window, WM_COMMAND, HEARTBEAT, (LPARAM)ProcStatus::Running);
}
[[nodiscard]]
bool Memory::Initialize() {
// First, get the handle of the process
PROCESSENTRY32W entry;
entry.dwSize = sizeof(entry);
HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
while (Process32NextW(snapshot, &entry)) {
if (_processName == entry.szExeFile) {
_handle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, entry.th32ProcessID);
break;
}
}
if (!_handle) {
std::cerr << "Couldn't find " << _processName.c_str() << ", is it open?" << std::endl;
return false;
}
// Next, get the process base address
DWORD numModules;
std::vector<HMODULE> moduleList(1024);
EnumProcessModulesEx(_handle, &moduleList[0], static_cast<DWORD>(moduleList.size()), &numModules, 3);
std::wstring name(64, '\0');
for (DWORD i = 0; i < numModules / sizeof(HMODULE); i++) {
int length = GetModuleBaseNameW(_handle, moduleList[i], &name[0], static_cast<DWORD>(name.size()));
name.resize(length);
if (_processName == name) {
_baseAddress = (uintptr_t)moduleList[i];
break;
}
}
if (_baseAddress == 0) {
std::cerr << "Couldn't locate base address" << std::endl;
return false;
}
return true;
}
void Memory::AddSigScan(const std::vector<byte>& scanBytes, const std::function<void(int index)>& scanFunc)
{
_sigScans[scanBytes] = {scanFunc, false};
}
int find(const std::vector<byte> &data, const std::vector<byte>& search, size_t startIndex = 0) {
for (size_t i=startIndex; i<data.size() - search.size(); i++) {
bool match = true;
for (size_t j=0; j<search.size(); j++) {
if (data[i+j] == search[j]) {
continue;
}
match = false;
break;
}
if (match) return static_cast<int>(i);
}
return -1;
}
int Memory::ExecuteSigScans()
{
for (int i=0; i<0x200000; i+=0x1000) {
std::vector<byte> data = ReadData<byte>({i}, 0x1100);
for (auto& [scanBytes, sigScan] : _sigScans) {
if (sigScan.found) continue;
int index = find(data, scanBytes);
if (index == -1) continue;
sigScan.scanFunc(i + index);
sigScan.found = true;
}
}
int notFound = 0;
for (auto it : _sigScans) {
if (it.second.found == false) notFound++;
}
return notFound;
}
void Memory::ThrowError() {
std::wstring message(256, '\0');
DWORD error = GetLastError();
int length = FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, error, 1024, &message[0], static_cast<DWORD>(message.size()), nullptr);
message.resize(length);
#ifndef NDEBUG
MessageBox(NULL, message.c_str(), L"Please tell darkid about this", MB_OK);
#endif
}
void* Memory::ComputeOffset(std::vector<int> offsets) {
// Leave off the last offset, since it will be either read/write, and may not be of type uintptr_t.
int final_offset = offsets.back();
offsets.pop_back();
uintptr_t cumulativeAddress = _baseAddress;
for (const int offset : offsets) {
cumulativeAddress += offset;
const auto search = _computedAddresses.find(cumulativeAddress);
// This is an issue with re-randomization. Always. Just disable it in debug mode!
#ifdef NDEBUG
if (search == std::end(_computedAddresses)) {
#endif
// If the address is not yet computed, then compute it.
uintptr_t computedAddress = 0;
if (bool result = !ReadProcessMemory(_handle, reinterpret_cast<LPVOID>(cumulativeAddress), &computedAddress, sizeof(uintptr_t), NULL)) {
ThrowError();
}
if (computedAddress == 0) { // Attempting to dereference a nullptr
ThrowError();
}
_computedAddresses[cumulativeAddress] = computedAddress;
#ifdef NDEBUG
}
#endif
cumulativeAddress = _computedAddresses[cumulativeAddress];
}
return reinterpret_cast<void*>(cumulativeAddress + final_offset);
}
uintptr_t Memory::Allocate(size_t bytes) {
/*
uintptr_t ForeignProcessMemory::AllocateMemory(size_t Size, DWORD Flags) const {
if (!ProcessHandle) {
return 0;
}
return (uintptr_t)VirtualAllocEx(ProcessHandle, nullptr, Size, MEM_RESERVE | MEM_COMMIT, Flags);
}
void ForeignProcessMemory::DeallocateMemory(uintptr_t Addr) const {
if (!ProcessHandle || Addr == 0) {
return;
}
VirtualFreeEx(ProcessHandle, (void*)Addr, 0, MEM_RELEASE);
}
*/
uintptr_t current = _freeMem;
_freeMem += bytes;
if (_freeMem > _freeMemEnd) {
// If we don't have enough space at our current location, go allocate some more space.
// Note that the remaining space in our current page is unused. Oh well.
_freeMem = reinterpret_cast<uintptr_t>(::VirtualAllocEx(_handle, NULL, 0x1000, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE));
_freeMemEnd = _freeMem + 0x1000;
current = _freeMem;
_freeMem += bytes;
assert(_freeMem <= _freeMemEnd); // Don't allocate data > 0x1000 at a time. Duh.
}
return current;
}
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