From 4c4d605d10109e02708984755405bbe0947ef5c4 Mon Sep 17 00:00:00 2001
From: BobTheBob <32057864+BobTheBob9@users.noreply.github.com>
Date: Thu, 8 Jul 2021 15:33:31 +0100
Subject: initial commit

---
 NorthstarDedicatedTest/hooks.cpp | 90 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 NorthstarDedicatedTest/hooks.cpp

(limited to 'NorthstarDedicatedTest/hooks.cpp')

diff --git a/NorthstarDedicatedTest/hooks.cpp b/NorthstarDedicatedTest/hooks.cpp
new file mode 100644
index 00000000..a3be154d
--- /dev/null
+++ b/NorthstarDedicatedTest/hooks.cpp
@@ -0,0 +1,90 @@
+#include "pch.h"
+#include "hooks.h"
+#include "hookutils.h"
+#include "dedicated.h"
+#include "tier0.h"
+
+#include <wchar.h>
+#include <iostream>
+#include <vector>
+
+typedef HMODULE(*LoadLibraryExAType)(LPCSTR lpLibFileName, HANDLE hFile, DWORD dwFlags);
+HMODULE LoadLibraryExAHook(LPCSTR lpLibFileName, HANDLE hFile, DWORD dwFlags);
+
+typedef HMODULE(*LoadLibraryExWType)(LPCWSTR lpLibFileName, HANDLE hFile, DWORD dwFlags);
+HMODULE LoadLibraryExWHook(LPCWSTR lpLibFileName, HANDLE hFile, DWORD dwFlags);
+
+LoadLibraryExAType LoadLibraryExAOriginal;
+LoadLibraryExWType LoadLibraryExWOriginal;
+
+void InstallInitialHooks()
+{
+	//AllocConsole();
+
+	if (MH_Initialize() != MH_OK)
+		Error("MH_Initialize failed");
+	
+	HookEnabler hook;
+	ENABLER_CREATEHOOK(hook, &LoadLibraryExA, &LoadLibraryExAHook, reinterpret_cast<LPVOID*>(&LoadLibraryExAOriginal));
+	ENABLER_CREATEHOOK(hook, &LoadLibraryExW, &LoadLibraryExWHook, reinterpret_cast<LPVOID*>(&LoadLibraryExWOriginal));
+}
+
+// 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;
+	bool called;
+};
+
+std::vector<DllLoadCallback*> dllLoadCallbacks;
+
+void AddDllLoadCallback(std::string dll, DllLoadCallbackFuncType callback)
+{
+	DllLoadCallback* callbackStruct = new DllLoadCallback;
+	callbackStruct->dll = dll;
+	callbackStruct->callback = callback;
+	callbackStruct->called = false;
+
+	dllLoadCallbacks.push_back(callbackStruct);
+}
+
+HMODULE LoadLibraryExAHook(LPCSTR lpLibFileName, HANDLE hFile, DWORD dwFlags)
+{
+	HMODULE moduleAddress = LoadLibraryExAOriginal(lpLibFileName, hFile, dwFlags);
+	
+	if (moduleAddress)
+	{
+		for (auto& callbackStruct : dllLoadCallbacks)
+		{
+			if (!callbackStruct->called && strstr(lpLibFileName + (strlen(lpLibFileName) - strlen(callbackStruct->dll.c_str())), callbackStruct->dll.c_str()) != nullptr)
+			{
+				callbackStruct->callback(moduleAddress);
+				callbackStruct->called = true;
+			}
+		}
+	}
+
+	return moduleAddress;
+}
+
+HMODULE LoadLibraryExWHook(LPCWSTR lpLibFileName, HANDLE hFile, DWORD dwFlags)
+{
+	HMODULE moduleAddress = LoadLibraryExWOriginal(lpLibFileName, hFile, dwFlags);
+
+	if (moduleAddress)
+	{
+		for (auto& callbackStruct : dllLoadCallbacks)
+		{
+			const wchar_t* callbackDll = std::wstring(callbackStruct->dll.begin(), callbackStruct->dll.end()).c_str();
+			if (!callbackStruct->called && wcsstr(lpLibFileName + (wcslen(lpLibFileName) - wcslen(callbackDll)), callbackDll) != nullptr)
+			{
+				callbackStruct->callback(moduleAddress);
+				callbackStruct->called = true;
+			}
+		}
+	}
+
+	return moduleAddress;
+}
\ No newline at end of file
-- 
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