mirror of
https://github.com/HIllya51/LunaHook.git
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82 lines
3.0 KiB
C++
82 lines
3.0 KiB
C++
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#include"AB2Try.h"
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/********************************************************************************************
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AkabeiSoft2Try hook:
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Game folder contains YaneSDK.dll. Maybe we should call the engine Yane(屋<EFBFBD> = roof)?
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This engine is based on .NET framework. This really makes it troublesome to locate a
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valid hook address. The problem is that the engine file merely contains bytecode for
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the CLR. Real meaningful object code is generated dynamically and the address is randomized.
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Therefore the easiest method is to brute force search whole address space. While it's not necessary
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to completely search the whole address space, since non-executable pages can be excluded first.
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The generated code sections do not belong to any module(exe/dll), hence they do not have
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a section name. So we can also exclude executable pages from all modules. At last, the code
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section should be long(>0x2000). The remain address space should be several MBs in size and
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can be examined in reasonable time(less than 0.1s for P8400 Win7x64).
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Characteristic sequence is 0F B7 44 50 0C, stands for movzx eax, word ptr [edx*2 + eax + C].
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Obviously this instruction extracts one unicode character from a string.
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A main shortcoming is that the code is not generated if it hasn't been used yet.
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So if you are in title screen this approach will fail.
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********************************************************************************************/
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namespace { // unnamed
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typedef struct _NSTRING
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{
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PVOID vfTable;
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DWORD lenWithNull;
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DWORD lenWithoutNull;
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WCHAR str[1];
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} NSTRING;
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// qsort correctly identifies overflow.
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int cmp(const void * a, const void * b)
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{ return *(int*)a - *(int*)b; }
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void SpecialHookAB2Try(hook_stack* stack, HookParam *, uintptr_t *data, uintptr_t *split, size_t *len)
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{
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//DWORD test = *(DWORD*)(esp_base - 0x10);
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DWORD edx = stack->edx;
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if (edx != 0)
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return;
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//NSTRING *s = *(NSTRING **)(esp_base - 8);
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if (const NSTRING *s = (NSTRING *)stack->eax) {
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*len = s->lenWithoutNull << 1;
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*data = (DWORD)s->str;
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//*split = 0;
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*split = FIXED_SPLIT_VALUE; // 8/3/2014 jichi: change to single threads
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}
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}
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bool FindCharacteristInstruction()
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{
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const BYTE bytes[] = { 0x0F, 0xB7, 0x44, 0x50, 0x0C, 0x89 };
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for (auto addr : Util::SearchMemory(bytes, sizeof(bytes), PAGE_EXECUTE_READWRITE))
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{
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//GROWL_DWORD(addr);
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HookParam hp;
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hp.address = addr;
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hp.text_fun = SpecialHookAB2Try;
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hp.type = USING_STRING | NO_CONTEXT | CODEC_UTF16;
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ConsoleOutput("INSERT AB2Try");
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//ConsoleOutput("Please adjust text speed to fastest/immediate.");
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//RegisterEngineType(ENGINE_AB2T);
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return NewHook(hp, "AB2Try");
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}
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return false;
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}
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} // unnamed namespace
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bool InsertAB2TryHook()
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{
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bool ret = FindCharacteristInstruction();
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if (ret)
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ConsoleOutput("AB2Try: found characteristic sequence");
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else
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ConsoleOutput("AB2Try: cannot find characteristic sequence. Make sure you have start the game and have seen some text on the screen.");
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return ret;
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}
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bool AB2Try::attach_function() {
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return InsertAB2TryHook();
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}
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