1 files changed, 426 insertions, 0 deletions
diff --git a/NorthstarDLL/core/hooks.cpp b/NorthstarDLL/core/hooks.cpp
new file mode 100644
index 00000000..79bcbb92
--- /dev/null
+++ b/NorthstarDLL/core/hooks.cpp
@@ -0,0 +1,426 @@
+#include "pch.h"
+#include "dedicated/dedicated.h"
+
+#include <iostream>
+#include <wchar.h>
+#include <iostream>
+#include <vector>
+#include <fstream>
+#include <sstream>
+#include <filesystem>
+#include <Psapi.h>
+
+AUTOHOOK_INIT()
+
+// called from the ON_DLL_LOAD macros
+__dllLoadCallback::__dllLoadCallback(
+	eDllLoadCallbackSide side, const std::string dllName, DllLoadCallbackFuncType callback, std::string uniqueStr, std::string reliesOn)
+{
+	// parse reliesOn array from string
+	std::vector<std::string> reliesOnArray;
+
+	if (reliesOn.length() && reliesOn[0] != '(')
+	{
+		reliesOnArray.push_back(reliesOn);
+	}
+	else
+	{
+		// follows the format (tag, tag, tag)
+		std::string sCurrentTag;
+		for (int i = 1; i < reliesOn.length(); i++)
+		{
+			if (!isspace(reliesOn[i]))
+			{
+				if (reliesOn[i] == ',' || reliesOn[i] == ')')
+				{
+					reliesOnArray.push_back(sCurrentTag);
+					sCurrentTag = "";
+				}
+				else
+					sCurrentTag += reliesOn[i];
+			}
+		}
+	}
+
+	switch (side)
+	{
+	case eDllLoadCallbackSide::UNSIDED:
+	{
+		AddDllLoadCallback(dllName, callback, uniqueStr, reliesOnArray);
+		break;
+	}
+
+	case eDllLoadCallbackSide::CLIENT:
+	{
+		AddDllLoadCallbackForClient(dllName, callback, uniqueStr, reliesOnArray);
+		break;
+	}
+
+	case eDllLoadCallbackSide::DEDICATED_SERVER:
+	{
+		AddDllLoadCallbackForDedicatedServer(dllName, callback, uniqueStr, reliesOnArray);
+		break;
+	}
+	}
+}
+
+void __fileAutohook::Dispatch()
+{
+	for (__autohook* hook : hooks)
+		hook->Dispatch();
+}
+
+void __fileAutohook::DispatchForModule(const char* pModuleName)
+{
+	const int iModuleNameLen = strlen(pModuleName);
+
+	for (__autohook* hook : hooks)
+		if ((hook->iAddressResolutionMode == __autohook::OFFSET_STRING && !strncmp(pModuleName, hook->pAddrString, iModuleNameLen)) ||
+			(hook->iAddressResolutionMode == __autohook::PROCADDRESS && !strcmp(pModuleName, hook->pModuleName)))
+			hook->Dispatch();
+}
+
+ManualHook::ManualHook(const char* funcName, LPVOID func) : pHookFunc(func), ppOrigFunc(nullptr)
+{
+	const int iFuncNameStrlen = strlen(funcName);
+	pFuncName = new char[iFuncNameStrlen];
+	memcpy(pFuncName, funcName, iFuncNameStrlen);
+}
+
+ManualHook::ManualHook(const char* funcName, LPVOID* orig, LPVOID func) : pHookFunc(func), ppOrigFunc(orig)
+{
+	const int iFuncNameStrlen = strlen(funcName);
+	pFuncName = new char[iFuncNameStrlen];
+	memcpy(pFuncName, funcName, iFuncNameStrlen);
+}
+
+bool ManualHook::Dispatch(LPVOID addr, LPVOID* orig)
+{
+	if (orig)
+		ppOrigFunc = orig;
+
+	if (MH_CreateHook(addr, pHookFunc, ppOrigFunc) == MH_OK)
+	{
+		if (MH_EnableHook(addr) == MH_OK)
+		{
+			spdlog::info("Enabling hook {}", pFuncName);
+			return true;
+		}
+		else
+			spdlog::error("MH_EnableHook failed for function {}", pFuncName);
+	}
+	else
+		spdlog::error("MH_CreateHook failed for function {}", pFuncName);
+
+	return false;
+}
+
+// dll load callback stuff
+// this allows for code to register callbacks to be run as soon as a dll is loaded, mainly to allow for patches to be made on dll load
+struct DllLoadCallback
+{
+	std::string dll;
+	DllLoadCallbackFuncType callback;
+	std::string tag;
+	std::vector<std::string> reliesOn;
+	bool called;
+};
+
+// HACK: declaring and initialising this vector at file scope crashes on debug builds due to static initialisation order
+// using a static var like this ensures that the vector is initialised lazily when it's used
+std::vector<DllLoadCallback>& GetDllLoadCallbacks()
+{
+	static std::vector<DllLoadCallback> vec = std::vector<DllLoadCallback>();
+	return vec;
+}
+
+void AddDllLoadCallback(std::string dll, DllLoadCallbackFuncType callback, std::string tag, std::vector<std::string> reliesOn)
+{
+	DllLoadCallback& callbackStruct = GetDllLoadCallbacks().emplace_back();
+
+	callbackStruct.dll = dll;
+	callbackStruct.callback = callback;
+	callbackStruct.tag = tag;
+	callbackStruct.reliesOn = reliesOn;
+	callbackStruct.called = false;
+}
+
+void AddDllLoadCallbackForDedicatedServer(
+	std::string dll, DllLoadCallbackFuncType callback, std::string tag, std::vector<std::string> reliesOn)
+{
+	if (!IsDedicatedServer())
+		return;
+
+	AddDllLoadCallback(dll, callback, tag, reliesOn);
+}
+
+void AddDllLoadCallbackForClient(std::string dll, DllLoadCallbackFuncType callback, std::string tag, std::vector<std::string> reliesOn)
+{
+	if (IsDedicatedServer())
+		return;
+
+	AddDllLoadCallback(dll, callback, tag, reliesOn);
+}
+
+void MakeHook(LPVOID pTarget, LPVOID pDetour, void* ppOriginal, const char* pFuncName)
+{
+	char* pStrippedFuncName = (char*)pFuncName;
+	// strip & char from funcname
+	if (*pStrippedFuncName == '&')
+		pStrippedFuncName++;
+
+	if (MH_CreateHook(pTarget, pDetour, (LPVOID*)ppOriginal) == MH_OK)
+	{
+		if (MH_EnableHook(pTarget) == MH_OK)
+			spdlog::info("Enabling hook {}", pStrippedFuncName);
+		else
+			spdlog::error("MH_EnableHook failed for function {}", pStrippedFuncName);
+	}
+	else
+		spdlog::error("MH_CreateHook failed for function {}", pStrippedFuncName);
+}
+
+AUTOHOOK_ABSOLUTEADDR(_GetCommandLineA, GetCommandLineA, LPSTR, WINAPI, ())
+{
+	static char* cmdlineModified;
+	static char* cmdlineOrg;
+
+	if (cmdlineOrg == nullptr || cmdlineModified == nullptr)
+	{
+		cmdlineOrg = _GetCommandLineA();
+		bool isDedi = strstr(cmdlineOrg, "-dedicated"); // well, this one has to be a real argument
+		bool ignoreStartupArgs = strstr(cmdlineOrg, "-nostartupargs");
+
+		std::string args;
+		std::ifstream cmdlineArgFile;
+
+		// it looks like CommandLine() prioritizes parameters apprearing first, so we want the real commandline to take priority
+		// not to mention that cmdlineOrg starts with the EXE path
+		args.append(cmdlineOrg);
+		args.append(" ");
+
+		// append those from the file
+
+		if (!ignoreStartupArgs)
+		{
+
+			cmdlineArgFile = std::ifstream(!isDedi ? "ns_startup_args.txt" : "ns_startup_args_dedi.txt");
+
+			if (cmdlineArgFile)
+			{
+				std::stringstream argBuffer;
+				argBuffer << cmdlineArgFile.rdbuf();
+				cmdlineArgFile.close();
+
+				// if some other command line option includes "-northstar" in the future then you have to refactor this check to check with
+				// both either space after or ending with
+				if (!isDedi && argBuffer.str().find("-northstar") != std::string::npos)
+					MessageBoxA(
+						NULL,
+						"The \"-northstar\" command line option is NOT supposed to go into ns_startup_args.txt file!\n\nThis option is "
+						"supposed to go into Origin/Steam game launch options, and then you are supposed to launch the original "
+						"Titanfall2.exe "
+						"rather than NorthstarLauncher.exe to make use of it.",
+						"Northstar Warning",
+						MB_ICONWARNING);
+
+				args.append(argBuffer.str());
+			}
+		}
+
+		auto len = args.length();
+		cmdlineModified = new char[len + 1];
+		if (!cmdlineModified)
+		{
+			spdlog::error("malloc failed for command line");
+			return cmdlineOrg;
+		}
+		memcpy(cmdlineModified, args.c_str(), len + 1);
+
+		spdlog::info("Command line: {}", cmdlineModified);
+	}
+
+	return cmdlineModified;
+}
+
+std::vector<std::string> calledTags;
+void CallLoadLibraryACallbacks(LPCSTR lpLibFileName, HMODULE moduleAddress)
+{
+	CModule cModule(moduleAddress);
+
+	while (true)
+	{
+		bool bDoneCalling = true;
+
+		for (auto& callbackStruct : GetDllLoadCallbacks())
+		{
+			if (!callbackStruct.called && fs::path(lpLibFileName).filename() == fs::path(callbackStruct.dll).filename())
+			{
+				bool bShouldContinue = false;
+
+				if (!callbackStruct.reliesOn.empty())
+				{
+					for (std::string tag : callbackStruct.reliesOn)
+					{
+						if (std::find(calledTags.begin(), calledTags.end(), tag) == calledTags.end())
+						{
+							bDoneCalling = false;
+							bShouldContinue = true;
+							break;
+						}
+					}
+				}
+
+				if (bShouldContinue)
+					continue;
+
+				callbackStruct.callback(moduleAddress);
+				calledTags.push_back(callbackStruct.tag);
+				callbackStruct.called = true;
+			}
+		}
+
+		if (bDoneCalling)
+			break;
+	}
+}
+
+void CallLoadLibraryWCallbacks(LPCWSTR lpLibFileName, HMODULE moduleAddress)
+{
+	CModule cModule(moduleAddress);
+
+	while (true)
+	{
+		bool bDoneCalling = true;
+
+		for (auto& callbackStruct : GetDllLoadCallbacks())
+		{
+			if (!callbackStruct.called && fs::path(lpLibFileName).filename() == fs::path(callbackStruct.dll).filename())
+			{
+				bool bShouldContinue = false;
+
+				if (!callbackStruct.reliesOn.empty())
+				{
+					for (std::string tag : callbackStruct.reliesOn)
+					{
+						if (std::find(calledTags.begin(), calledTags.end(), tag) == calledTags.end())
+						{
+							bDoneCalling = false;
+							bShouldContinue = true;
+							break;
+						}
+					}
+				}
+
+				if (bShouldContinue)
+					continue;
+
+				callbackStruct.callback(moduleAddress);
+				calledTags.push_back(callbackStruct.tag);
+				callbackStruct.called = true;
+			}
+		}
+
+		if (bDoneCalling)
+			break;
+	}
+}
+
+void CallAllPendingDLLLoadCallbacks()
+{
+	HMODULE hMods[1024];
+	HANDLE hProcess = GetCurrentProcess();
+	DWORD cbNeeded;
+	unsigned int i;
+
+	// Get a list of all the modules in this process.
+	if (EnumProcessModules(hProcess, hMods, sizeof(hMods), &cbNeeded))
+	{
+		for (i = 0; i < (cbNeeded / sizeof(HMODULE)); i++)
+		{
+			wchar_t szModName[MAX_PATH];
+
+			// Get the full path to the module's file.
+			if (GetModuleFileNameExW(hProcess, hMods[i], szModName, sizeof(szModName) / sizeof(TCHAR)))
+			{
+				CallLoadLibraryWCallbacks(szModName, hMods[i]);
+			}
+		}
+	}
+}
+
+// clang-format off
+AUTOHOOK_ABSOLUTEADDR(_LoadLibraryExA, LoadLibraryExA,
+HMODULE, WINAPI, (LPCSTR lpLibFileName, HANDLE hFile, DWORD dwFlags))
+// clang-format on
+{
+	HMODULE moduleAddress;
+
+	// replace xinput dll with one that has ASLR
+	if (!strncmp(lpLibFileName, "XInput1_3.dll", 14))
+	{
+		moduleAddress = _LoadLibraryExA("XInput9_1_0.dll", hFile, dwFlags);
+
+		if (!moduleAddress)
+		{
+			MessageBoxA(0, "Could not find XInput9_1_0.dll", "Northstar", MB_ICONERROR);
+			exit(EXIT_FAILURE);
+
+			return nullptr;
+		}
+	}
+	else
+		moduleAddress = _LoadLibraryExA(lpLibFileName, hFile, dwFlags);
+
+	if (moduleAddress)
+		CallLoadLibraryACallbacks(lpLibFileName, moduleAddress);
+
+	return moduleAddress;
+}
+
+// clang-format off
+AUTOHOOK_ABSOLUTEADDR(_LoadLibraryA, LoadLibraryA,
+HMODULE, WINAPI, (LPCSTR lpLibFileName))
+// clang-format on
+{
+	HMODULE moduleAddress = _LoadLibraryA(lpLibFileName);
+
+	if (moduleAddress)
+		CallLoadLibraryACallbacks(lpLibFileName, moduleAddress);
+
+	return moduleAddress;
+}
+
+// clang-format off
+AUTOHOOK_ABSOLUTEADDR(_LoadLibraryExW, LoadLibraryExW,
+HMODULE, WINAPI, (LPCWSTR lpLibFileName, HANDLE hFile, DWORD dwFlags))
+// clang-format on
+{
+	HMODULE moduleAddress = _LoadLibraryExW(lpLibFileName, hFile, dwFlags);
+
+	if (moduleAddress)
+		CallLoadLibraryWCallbacks(lpLibFileName, moduleAddress);
+
+	return moduleAddress;
+}
+
+// clang-format off
+AUTOHOOK_ABSOLUTEADDR(_LoadLibraryW, LoadLibraryW,
+HMODULE, WINAPI, (LPCWSTR lpLibFileName))
+// clang-format on
+{
+	HMODULE moduleAddress = _LoadLibraryW(lpLibFileName);
+
+	if (moduleAddress)
+		CallLoadLibraryWCallbacks(lpLibFileName, moduleAddress);
+
+	return moduleAddress;
+}
+
+void InstallInitialHooks()
+{
+	if (MH_Initialize() != MH_OK)
+		spdlog::error("MH_Initialize (minhook initialization) failed");
+
+	AUTOHOOK_DISPATCH()
+}