Codenz

dllmain.cc

@@ -0,0 +1,109 @@
+#define _CRT_SECURE_NO_WARNINGS
+#define _HAS_EXCEPTIONS 0
+#define WIN32_LEAN_AND_MEAN
+#include <cstdint>
+#include <unordered_set>
+#include <Windows.h>
+
+std::unordered_set<uint32_t> gIgnoreFileNames;
+
+bool __fastcall CementLibrary_OpenFile(void* p_CementLibrary, void* edx, uint32_t p_kFileName, void** p_File)
+{
+    if (gIgnoreFileNames.find(p_kFileName) != gIgnoreFileNames.end()) {
+        return false;
+    }
+
+    return reinterpret_cast<bool(__thiscall*)(void*, uint32_t, void**)>(0x6E6D90)(p_CementLibrary, p_kFileName, p_File);
+}
+
+bool ReplaceJmpRel32(uintptr_t p_Address, void* p_Target)
+{
+    uint32_t uJmpOffset = (reinterpret_cast<uint32_t>(p_Target) - p_Address - 5);
+    uint32_t* pPatchAddress = reinterpret_cast<uint32_t*>(p_Address + 1);
+
+    DWORD dwOldProtection;
+    if (!VirtualProtect(reinterpret_cast<void*>(pPatchAddress), sizeof(uint32_t), PAGE_EXECUTE_READWRITE, &dwOldProtection)) {
+        return false;
+    }
+
+    *pPatchAddress = uJmpOffset;
+
+    VirtualProtect(reinterpret_cast<void*>(pPatchAddress), sizeof(uint32_t), dwOldProtection, &dwOldProtection);
+    return true;
+}
+
+void RegisterFileOrFolder(const char* p_szPath)
+{
+    char dirPath[MAX_PATH] = { 0 };
+    const char* pLastDelimer = strrchr(p_szPath, '/\\');
+    if (pLastDelimer) {
+        strncpy(dirPath, p_szPath, static_cast<size_t>(pLastDelimer - p_szPath) + 1);
+    }
+
+    WIN32_FIND_DATAA wFindData = { 0 };
+    HANDLE hFindData = FindFirstFileA(p_szPath, &wFindData);
+    if (hFindData == INVALID_HANDLE_VALUE) {
+        return;
+    }
+
+    char fullPath[MAX_PATH];
+    do
+    {
+        sprintf_s(fullPath, sizeof(fullPath), "%s%s", dirPath, wFindData.cFileName);
+
+        if (wFindData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+        {
+            if (wFindData.cFileName[0] == '.') {
+                continue;
+            }
+
+            RegisterFileOrFolder(fullPath);
+            continue;
+        }
+
+        uint32_t fileHash = reinterpret_cast<uint32_t(__cdecl*)(const char*)>(0x6DCC70)(fullPath);
+        gIgnoreFileNames.insert(fileHash);
+    } 
+    while (FindNextFileA(hFindData, &wFindData));
+
+    FindClose(hFindData);
+}
+
+bool LoadList()
+{
+    FILE* pFileList = fopen("plugins\\RCFRedirect.list", "r");
+    if (!pFileList) {
+        return false;
+    }
+
+    char filePath[MAX_PATH];
+    while (fgets(filePath, sizeof(filePath), pFileList) != NULL)
+    {
+        filePath[strcspn(filePath, "\r\n")] = '\0';
+        RegisterFileOrFolder(filePath);
+    }
+
+    fclose(pFileList);
+    return true;
+}
+
+int __stdcall DllMain(HMODULE p_hModule, DWORD p_dwReason, void* p_pReserved)
+{
+    if (p_dwReason == DLL_PROCESS_ATTACH)
+    {
+        if (*reinterpret_cast<uint32_t*>(0x400128) != 0x455CAD51) 
+        {
+            MessageBoxA(0, "You're using wrong game version. v1.00.2 is required!", "RCFRedirect", MB_OK | MB_ICONERROR);
+            return 0;
+        }
+
+        if (!LoadList()) {
+            return 0;
+        }
+
+        // Replace function call to our to filter file names.
+        ReplaceJmpRel32(0x6E6FA0, CementLibrary_OpenFile);
+    }
+
+    return 1;
+}