aboutsummaryrefslogtreecommitdiff
path: root/NorthstarDLL/hooks.cpp
blob: 2b11717811debe521fe8bcab2fc3f52d09f1461b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
#include "pch.h"
#include "dedicated.h"

#include <iostream>
#include <wchar.h>
#include <iostream>
#include <vector>
#include <fstream>
#include <sstream>
#include <filesystem>
#include <Psapi.h>

namespace fs = std::filesystem;

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)
{
	switch (side)
	{
		case eDllLoadCallbackSide::UNSIDED:
		{
			AddDllLoadCallback(dllName, callback, uniqueStr, reliesOn);
			break;
		}

		case eDllLoadCallbackSide::CLIENT:
		{
			AddDllLoadCallbackForClient(dllName, callback, uniqueStr, reliesOn);
			break;
		}

		case eDllLoadCallbackSide::DEDICATED_SERVER:
		{
			AddDllLoadCallbackForDedicatedServer(dllName, callback, uniqueStr, reliesOn);
			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::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::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::string reliesOn)
{
	if (!IsDedicatedServer())
		return;

	AddDllLoadCallback(dll, callback, tag, reliesOn);
}

void AddDllLoadCallbackForClient(std::string dll, DllLoadCallbackFuncType callback, std::string tag, std::string reliesOn)
{
	if (IsDedicatedServer())
		return;

	AddDllLoadCallback(dll, callback, tag, reliesOn);
}

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)
{
	while (true)
	{
		bool bDoneCalling = true;

		for (auto& callbackStruct : GetDllLoadCallbacks())
		{
			if (!callbackStruct.called && fs::path(lpLibFileName).filename() == fs::path(callbackStruct.dll).filename())
			{
				if (callbackStruct.reliesOn != "" &&
					std::find(calledTags.begin(), calledTags.end(), callbackStruct.reliesOn) == calledTags.end())
				{
					bDoneCalling = false;
					continue;
				}

				callbackStruct.callback(moduleAddress);
				calledTags.push_back(callbackStruct.tag);
				callbackStruct.called = true;
			}
		}

		if (bDoneCalling)
			break;
	}
}

void CallLoadLibraryWCallbacks(LPCWSTR lpLibFileName, HMODULE moduleAddress)
{
	while (true)
	{
		bool bDoneCalling = true;

		for (auto& callbackStruct : GetDllLoadCallbacks())
		{
			if (!callbackStruct.called && fs::path(lpLibFileName).filename() == fs::path(callbackStruct.dll).filename())
			{
				if (callbackStruct.reliesOn != "" &&
					std::find(calledTags.begin(), calledTags.end(), callbackStruct.reliesOn) == calledTags.end())
				{
					bDoneCalling = false;
					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]);
			}
		}
	}
}

AUTOHOOK_ABSOLUTEADDR(_LoadLibraryExA, LoadLibraryExA, 
HMODULE, WINAPI, (LPCSTR lpLibFileName, HANDLE hFile, DWORD dwFlags), 
	{
	HMODULE moduleAddress = _LoadLibraryExA(lpLibFileName, hFile, dwFlags);

	if (moduleAddress)
		CallLoadLibraryACallbacks(lpLibFileName, moduleAddress);

	return moduleAddress;
})


AUTOHOOK_ABSOLUTEADDR(_LoadLibraryA, LoadLibraryA, 
HMODULE, WINAPI, (LPCSTR lpLibFileName), 
{
	HMODULE moduleAddress = _LoadLibraryA(lpLibFileName);

	if (moduleAddress)
		CallLoadLibraryACallbacks(lpLibFileName, moduleAddress);

	return moduleAddress;
})

AUTOHOOK_ABSOLUTEADDR(_LoadLibraryExW, LoadLibraryExW, 
HMODULE, WINAPI, (LPCWSTR lpLibFileName, HANDLE hFile, DWORD dwFlags), 
{
	HMODULE moduleAddress = _LoadLibraryExW(lpLibFileName, hFile, dwFlags);

	if (moduleAddress)
		CallLoadLibraryWCallbacks(lpLibFileName, moduleAddress);

	return moduleAddress;
})

AUTOHOOK_ABSOLUTEADDR(_LoadLibraryW, LoadLibraryW, 
HMODULE, WINAPI, (LPCWSTR lpLibFileName), 
{
	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()
}