mirror of
https://github.com/HIllya51/LunaHook.git
synced 2024-11-24 14:25:37 +08:00
103 lines
4.0 KiB
C++
103 lines
4.0 KiB
C++
#include"V8.h"
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#include"v8/v8.h"
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#if 0
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/**
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* Artikash 7/15/2018: Insert Tyranobuilder hook
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* Sample game: https://vndb.org/v22252: /HWN-8:-1C@233A54:yuika_t.exe
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* Artikash 9/11/2018: This is more than just Tyranobuilder. It's actually a hook for the V8 JavaScript runtime
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* Sample game: https://www.freem.ne.jp/win/game/9672: /HQ8@2317A0:Prison.exe This new hook seems more reliable
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* Nevermind both of those, just hook v8::String::Write https://v8docs.nodesource.com/node-0.8/d2/db3/classv8_1_1_string.html
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* v8::String::Write - 55 - push ebp
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* v8::String::Write+1- 8B EC - mov ebp,esp
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* v8::String::Write+3- 8B 45 14 - mov eax,[ebp+14]
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* v8::String::Write+6- 8B 55 10 - mov edx,[ebp+10]
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* v8::String::Write+9- 50 - push eax
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* v8::String::Write+A- 8B 45 0C - mov eax,[ebp+0C]
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* v8::String::Write+D- 52 - push edx
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* v8::String::Write+E- 8B 55 08 - mov edx,[ebp+08]
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* v8::String::Write+11- 50 - push eax
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* v8::String::Write+12- 52 - push edx
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* v8::String::Write+13- 51 - push ecx
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* v8::String::Write+14- E8 B7C7FFFF - call 6EF630 ; actual writing happens in this function, hooking after is possible
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* v8::String::Write+19- 83 C4 14 - add esp,14 { 20 }
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* v8::String::Write+1C- 5D - pop ebp
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* v8::String::Write+1D- C2 1000 - ret 0010 { 16 }
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*/
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void SpecialHookV8String(hook_stack*, HookParam *hp, uintptr_t* data, uintptr_t* split, size_t* len)
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{
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DWORD ecx = *data;
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DWORD strPtr = *(DWORD*)ecx;
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*data = strPtr + 0xb;
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*len = *(short*)(strPtr + 7);
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if(wcslen((wchar_t*)*data)*2<*len)*len=0;
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//if (*len < 12) *split = 1; // To ensure this is caught by cyclic repetition detection, split if there's 6+ wide chars
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//*split = *(DWORD*)((BYTE*)hp->split + dwDatabase);
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}
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bool InsertV8Hook(HMODULE module)
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{
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auto [minAddress, maxAddress] = Util::QueryModuleLimits(module);
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for (const auto& pattern : Array<const BYTE[3]>{ { 0x55, 0x8b, 0xec }, { 0x55, 0x89, 0xe5 } })
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{
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int matches = Util::SearchMemory(pattern, sizeof(pattern), PAGE_EXECUTE, minAddress, maxAddress).size(), requiredRecords = matches * 20;
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if (matches > 10'000 && requiredRecords > spDefault.maxRecords)
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{
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memcpy(spDefault.pattern, pattern, spDefault.length = sizeof(pattern));
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spDefault.maxRecords = requiredRecords;
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}
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}
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std::tie(spDefault.minAddress, spDefault.maxAddress) = std::tuple{ minAddress, maxAddress };
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ConsoleOutput("JavaScript hook is known to be low quality: try searching for hooks if you don't like it");
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HookParam hp;
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hp.address = (DWORD)GetProcAddress(module, "?Write@String@v8@@QBEHPAGHHH@Z");
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hp.offset=get_reg(regs::ecx);
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hp.type = CODEC_UTF16 | USING_STRING;
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hp.text_fun = SpecialHookV8String;
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auto succ=NewHook(hp, "JavaScript");
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const BYTE bytes[] = {
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0x83, 0xc4, XX, // add esp,XX
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0x5d, // pop ebp
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0xc2 // ret
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};
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if (DWORD addr = MemDbg::findBytes(bytes, sizeof(bytes), hp.address, hp.address + 0x30))
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{
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hp.address = addr;
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hp.offset = 0x8 + *(BYTE*)(addr + 2); // second argument + amount that the stack pointer is offset from arguments
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hp.type = CODEC_UTF16 | USING_STRING | NO_CONTEXT;
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hp.length_offset = (0x10 + *(BYTE*)(addr + 2)) / 4; // fourth argument + amount that the stack pointer is offset from arguments
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hp.text_fun = nullptr;
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succ|=NewHook(hp, "JavaScript2");
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}
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return succ;
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}
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bool hookv8addr(HMODULE module) {
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if (GetProcAddress(module, "?Write@String@v8@@QBEHPAGHHH@Z")==0)false;
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auto [minAddress, maxAddress] = Util::QueryModuleLimits(module);
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const BYTE bytes[] = {
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0x89,0xc1,
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0x0f,0xb7,0xd8,
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0x81,0xe1,0x00,0xfc,0x00,0x00,
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0x81,0xf9,0x00,0xd8,0x00,0x00
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};
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ULONG addr = MemDbg::findBytes(bytes, sizeof(bytes), minAddress, maxAddress);
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if (!addr) {
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return false;
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}
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HookParam hp;
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hp.address = addr;
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hp.offset=get_reg(regs::eax);
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hp.type = CODEC_UTF16 | NO_CONTEXT;
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return NewHook(hp, "electronW");
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}
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#endif
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bool V8::attach_function_() {
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return tryhookv8();
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}
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