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// dllmain.cpp : Defines the entry point for the DLL application.
#include "pch.h"
#include "MinHook.h"
#include <string>
#include <sstream>
#include <filesystem>
#include <iostream>
#include <iomanip>
#define DLL_NAME L"Northstar.dll"
class TempReadWrite
{
private:
DWORD m_origProtection;
void* m_ptr;
public:
TempReadWrite(void* ptr)
{
m_ptr = ptr;
MEMORY_BASIC_INFORMATION mbi;
VirtualQuery(m_ptr, &mbi, sizeof(mbi));
VirtualProtect(mbi.BaseAddress, mbi.RegionSize, PAGE_EXECUTE_READWRITE, &mbi.Protect);
m_origProtection = mbi.Protect;
}
~TempReadWrite()
{
MEMORY_BASIC_INFORMATION mbi;
VirtualQuery(m_ptr, &mbi, sizeof(mbi));
VirtualProtect(mbi.BaseAddress, mbi.RegionSize, m_origProtection, &mbi.Protect);
}
};
typedef BOOL(WINAPI *CreateProcessWType)(
LPCWSTR lpApplicationName,
LPWSTR lpCommandLine,
LPSECURITY_ATTRIBUTES lpProcessAttributes,
LPSECURITY_ATTRIBUTES lpThreadAttributes,
BOOL bInheritHandles,
DWORD dwCreationFlags,
LPVOID lpEnvironment,
LPCWSTR lpCurrentDirectory,
LPSTARTUPINFOW lpStartupInfo,
LPPROCESS_INFORMATION lpProcessInformation
);
CreateProcessWType CreateProcessWOriginal;
HMODULE ownHModule;
std::filesystem::path tf2DirPath;
BOOL WINAPI CreateProcessWHook(
LPCWSTR lpApplicationName,
LPWSTR lpCommandLine,
LPSECURITY_ATTRIBUTES lpProcessAttributes,
LPSECURITY_ATTRIBUTES lpThreadAttributes,
BOOL bInheritHandles,
DWORD dwCreationFlags,
LPVOID lpEnvironment,
LPCWSTR lpCurrentDirectory,
LPSTARTUPINFOW lpStartupInfo,
LPPROCESS_INFORMATION lpProcessInformation
)
{
bool isTitanfallProcess = false;
// origin doesn't use lpApplicationName
std::wcout << lpCommandLine << std::endl;
isTitanfallProcess = wcsstr(lpCommandLine, L"Titanfall2\\Titanfall2.exe");
// steam will start processes suspended (since we don't actually inject into steam directly this isn't required anymore, but whatever)
bool alreadySuspended = dwCreationFlags & CREATE_SUSPENDED;
// suspend process on creation so we can hook
if (isTitanfallProcess && !alreadySuspended)
dwCreationFlags |= CREATE_SUSPENDED;
BOOL ret = CreateProcessWOriginal(lpApplicationName, lpCommandLine, lpProcessAttributes, lpThreadAttributes, bInheritHandles, dwCreationFlags, lpEnvironment, lpCurrentDirectory, lpStartupInfo, lpProcessInformation);
if (isTitanfallProcess)
{
std::cout << "Creating titanfall process!" << std::endl;
std::cout << "Handle: " << lpProcessInformation->hProcess << " ID: " << lpProcessInformation->dwProcessId << " Thread: " << lpProcessInformation->hThread << std::endl;
STARTUPINFO si;
memset(&si, 0, sizeof(si));
PROCESS_INFORMATION pi;
memset(&pi, 0, sizeof(pi));
// check if we're launching EASteamProxy for steam users, or just launching tf2 directly for origin users
// note: atm we fully disable steam integration in origin when we inject, return to this later
if (!wcsstr(lpApplicationName, L"Origin\\EASteamProxy.exe"))
{
std::stringstream argStr;
argStr << lpProcessInformation->dwProcessId;
argStr << " ";
argStr << lpProcessInformation->dwThreadId;
CreateProcessA((tf2DirPath / "InjectionProxy64.exe").string().c_str(), (LPSTR)(argStr.str().c_str()), 0, 0, false, 0, 0, tf2DirPath.string().c_str(), (LPSTARTUPINFOA)&si, &pi);
WaitForSingleObject(pi.hThread, INFINITE);
}
else
{
// for easteamproxy, we have to inject ourself into it
// todo: atm we fully disable steam integration in origin when we inject, do this properly later
}
// this doesn't seem to work super well
//if (!alreadySuspended)
ResumeThread(lpProcessInformation->hThread);
// cleanup
MH_DisableHook(&CreateProcessW);
MH_RemoveHook(&CreateProcessW);
MH_Uninitialize();
// allow steam integrations to work again
void* ptr = (char*)GetModuleHandleA("OriginClient.dll") + 0x2A83FA;
TempReadWrite rw(ptr);
*((char*)ptr) = 0x0F; // jmp => je
*((char*)ptr + 1) = 0x84;
*((char*)ptr + 2) = 0xE5;
*((char*)ptr + 3) = 0x01;
*((char*)ptr + 4) = 0x00;
*((char*)ptr + 5) = 0x00;
// is this undefined behaviour? idk
FreeLibrary(ownHModule);
}
return ret;
}
BOOL APIENTRY DllMain(HMODULE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
DisableThreadLibraryCalls(hModule);
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
//AllocConsole();
//freopen("CONOUT$", "w", stdout);
ownHModule = hModule;
char ownDllPath[MAX_PATH];
GetModuleFileNameA(hModule, ownDllPath, MAX_PATH);
tf2DirPath = std::filesystem::path(ownDllPath).parent_path();
// hook CreateProcessW
if (MH_Initialize() > MH_ERROR_ALREADY_INITIALIZED) // MH_ERROR_ALREADY_INITIALIZED = 1, MH_OK = 0, these are the only results we should expect
return TRUE;
MH_CreateHook(&CreateProcessW, &CreateProcessWHook, reinterpret_cast<LPVOID*>(&CreateProcessWOriginal));
MH_EnableHook(&CreateProcessW);
// TEMP: temporarily disable steam stuff because it's a huge pain
// change conditional jump to EASteamProxy stuff in launchStep2 to never hit EASteamProxy launch
void* ptr = (char*)GetModuleHandleA("OriginClient.dll") + 0x2A83FA;
TempReadWrite rw(ptr);
*((char*)ptr) = 0xE9; // je => jmp
*((char*)ptr + 1) = 0xE6;
*((char*)ptr + 2) = 0x01;
*((char*)ptr + 3) = 0x00;
*((char*)ptr + 4) = 0x00;
return TRUE;
}
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