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Diffstat (limited to 'NorthstarDLL/NSMem.h')
| -rw-r--r-- | NorthstarDLL/NSMem.h | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/NorthstarDLL/NSMem.h b/NorthstarDLL/NSMem.h new file mode 100644 index 00000000..74df3a84 --- /dev/null +++ b/NorthstarDLL/NSMem.h @@ -0,0 +1,211 @@ +#pragma once +#include "pch.h" + +// KittenPopo's memory stuff, made for northstar (because I really can't handle working with northstar's original memory stuff tbh) + +#pragma region Pattern Scanning +namespace NSMem +{ + inline std::vector<int> HexBytesToString(const char* str) + { + std::vector<int> patternNums; + int size = strlen(str); + for (int i = 0; i < size; i++) + { + char c = str[i]; + + // If this is a space character, ignore it + if (c == ' ' || c == '\t') + continue; + + if (c == '?') + { + // Add a wildcard (-1) + patternNums.push_back(-1); + } + else if (i < size - 1) + { + BYTE result = 0; + for (int j = 0; j < 2; j++) + { + int val = 0; + char c = *(str + i + j); + if (c >= 'a') + { + val = c - 'a' + 0xA; + } + else if (c >= 'A') + { + val = c - 'A' + 0xA; + } + else if (isdigit(c)) + { + val = c - '0'; + } + else + { + assert(false, "Failed to parse invalid hex string."); + val = -1; + } + + result += (j == 0) ? val * 16 : val; + } + patternNums.push_back(result); + } + + i++; + } + + return patternNums; + } + + inline void* PatternScan(void* module, const int* pattern, int patternSize, int offset) + { + if (!module) + return NULL; + + auto dosHeader = (PIMAGE_DOS_HEADER)module; + auto ntHeaders = (PIMAGE_NT_HEADERS)((BYTE*)module + dosHeader->e_lfanew); + + auto sizeOfImage = ntHeaders->OptionalHeader.SizeOfImage; + + auto scanBytes = (BYTE*)module; + + for (auto i = 0; i < sizeOfImage - patternSize; ++i) + { + bool found = true; + for (auto j = 0; j < patternSize; ++j) + { + if (scanBytes[i + j] != pattern[j] && pattern[j] != -1) + { + found = false; + break; + } + } + + if (found) + { + uintptr_t addressInt = (uintptr_t)(&scanBytes[i]) + offset; + return (uint8_t*)addressInt; + } + } + + return nullptr; + } + + inline void* PatternScan(const char* moduleName, const char* pattern, int offset = 0) + { + std::vector<int> patternNums = HexBytesToString(pattern); + + return PatternScan(GetModuleHandleA(moduleName), &patternNums[0], patternNums.size(), offset); + } + + inline void BytePatch(uintptr_t address, const BYTE* vals, int size) + { + WriteProcessMemory(GetCurrentProcess(), (LPVOID)address, vals, size, NULL); + } + + inline void BytePatch(uintptr_t address, std::initializer_list<BYTE> vals) + { + std::vector<BYTE> bytes = vals; + if (!bytes.empty()) + BytePatch(address, &bytes[0], bytes.size()); + } + + inline void BytePatch(uintptr_t address, const char* bytesStr) + { + std::vector<int> byteInts = HexBytesToString(bytesStr); + std::vector<BYTE> bytes; + for (int v : byteInts) + bytes.push_back(v); + + if (!bytes.empty()) + BytePatch(address, &bytes[0], bytes.size()); + } + + inline void NOP(uintptr_t address, int size) + { + BYTE* buf = (BYTE*)malloc(size); + memset(buf, 0x90, size); + BytePatch(address, buf, size); + free(buf); + } + + inline bool IsMemoryReadable(void* ptr, size_t size) + { + static SYSTEM_INFO sysInfo; + if (!sysInfo.dwPageSize) + GetSystemInfo(&sysInfo); // This should always be 4096 unless ur playing on NES or some shit but whatever + + MEMORY_BASIC_INFORMATION memInfo; + + if (!VirtualQuery(ptr, &memInfo, sizeof(memInfo))) + return false; + + if (memInfo.RegionSize < size) + return false; + + return (memInfo.State & MEM_COMMIT) && !(memInfo.Protect & PAGE_NOACCESS); + } +} // namespace NSMem + +#pragma region KHOOK +struct KHookPatternInfo +{ + const char *moduleName, *pattern; + int offset = 0; + + KHookPatternInfo(const char* moduleName, const char* pattern, int offset = 0) : moduleName(moduleName), pattern(pattern), offset(offset) + { + } +}; + +struct KHook +{ + KHookPatternInfo targetFunc; + void* targetFuncAddr; + void* hookFunc; + void** original; + + static inline std::vector<KHook*> _allHooks; + + KHook(KHookPatternInfo targetFunc, void* hookFunc, void** original) : targetFunc(targetFunc) + { + this->hookFunc = hookFunc; + this->original = original; + _allHooks.push_back(this); + } + + bool Setup() + { + targetFuncAddr = NSMem::PatternScan(targetFunc.moduleName, targetFunc.pattern, targetFunc.offset); + if (!targetFuncAddr) + return false; + + return MH_CreateHook(targetFuncAddr, hookFunc, original) == MH_OK; + } + + // Returns true if succeeded + static bool InitAllHooks() + { + for (KHook* hook : _allHooks) + { + if (hook->Setup()) + { + spdlog::info("KHook hooked at {}", hook->targetFuncAddr); + } + else + { + return false; + } + } + + return MH_EnableHook(MH_ALL_HOOKS) == MH_OK; + } +}; +#define KHOOK(name, funcPatternInfo, returnType, convention, args) \ + returnType convention hk##name args; \ + auto o##name = (returnType(convention*) args)0; \ + KHook k##name = KHook(KHookPatternInfo funcPatternInfo, &hk##name, (void**)&o##name); \ + returnType convention hk##name args +#pragma endregion
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