hanfuit
645b64fe21
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95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
#pragma once
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#include <windows.h>
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#include <unordered_map>
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class InlineHook
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{
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public:
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static InlineHook& Instance()
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{
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static InlineHook inst;
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return inst;
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}
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bool Add(void* target, void* detour)
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{
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SIZE_T patchLen = CalcPatchLen(target, 5);
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if (patchLen < 5) return false;
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auto trampoline = (BYTE*)VirtualAlloc(NULL, patchLen + 5, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
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if (!trampoline) return false;
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memcpy(trampoline, target, patchLen);
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trampoline[patchLen] = 0xE9;
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*(DWORD*)(trampoline + patchLen + 1) = (DWORD)((BYTE*)target + patchLen) - (DWORD)(trampoline + patchLen + 5);
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DWORD old;
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VirtualProtect(target, patchLen, PAGE_EXECUTE_READWRITE, &old);
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*(BYTE*)target = 0xE9;
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*(DWORD*)((BYTE*)target + 1) = (DWORD)(BYTE*)detour - (DWORD)((BYTE*)target + 5);
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for (SIZE_T i = 5; i < patchLen; i++)
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*((BYTE*)target + i) = 0x90;
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VirtualProtect(target, patchLen, old, &old);
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m_trampolines[(uintptr_t)target] = trampoline;
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return true;
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}
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void* GetTrampoline(uintptr_t target)
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{
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auto it = m_trampolines.find(target);
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return it != m_trampolines.end() ? it->second : nullptr;
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}
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private:
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std::unordered_map<uintptr_t, BYTE*> m_trampolines;
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SIZE_T CalcPatchLen(void* addr, SIZE_T minLen)
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{
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SIZE_T len = 0;
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BYTE* p = (BYTE*)addr;
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while (len < minLen)
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len += InsnLen(p + len);
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return len;
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}
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SIZE_T InsnLen(BYTE* p)
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{
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if (p[0] == 0xCC || p[0] == 0xC3 || p[0] == 0x90) return 1;
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if (p[0] == 0x55 || p[0] == 0x53 || p[0] == 0x56 || p[0] == 0x57) return 1;
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if (p[0] == 0x5D || p[0] == 0x5B || p[0] == 0x5E || p[0] == 0x5F) return 1;
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if (p[0] == 0x50 || p[0] == 0x51 || p[0] == 0x52) return 1;
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if (p[0] == 0x58 || p[0] == 0x59 || p[0] == 0x5A) return 1;
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if (p[0] == 0x60 || p[0] == 0x61 || p[0] == 0x9C || p[0] == 0x9D) return 1;
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if (p[0] == 0x8B && (p[1] & 0xC0) == 0xC0) return 2;
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if (p[0] == 0x8B && p[1] == 0xEC) return 2;
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if (p[0] == 0x8B && p[1] == 0xFF) return 2;
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if (p[0] == 0x89 && (p[1] & 0xC0) == 0xC0) return 2;
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if (p[0] == 0x33 && (p[1] & 0xC0) == 0xC0) return 2;
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if (p[0] == 0x6A) return 2;
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if (p[0] == 0xEB) return 2;
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if (p[0] == 0xB8 || p[0] == 0xB9 || p[0] == 0xBA || p[0] == 0xBB ||
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p[0] == 0xBC || p[0] == 0xBD || p[0] == 0xBE || p[0] == 0xBF) return 5;
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if (p[0] == 0xE8 || p[0] == 0xE9) return 5;
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if (p[0] == 0x68) return 5;
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if (p[0] == 0x83 && p[1] == 0xEC) return 3;
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if (p[0] == 0x83 && p[1] == 0xE4) return 3;
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if (p[0] == 0x81 && p[1] == 0xEC) return 6;
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if (p[0] == 0xFF && p[1] == 0x25) return 6;
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if (p[0] == 0x8D && (p[1] & 0xC7) == 0x44) return 4;
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if (p[0] == 0x8D && (p[1] & 0xC0) == 0x40) return 3;
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if (p[0] == 0x64 && p[1] == 0xA1) return 6;
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return 1;
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}
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};
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inline BOOLEAN Hook_Inline(void* target, void* detour)
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{
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return InlineHook::Instance().Add(target, detour) ? TRUE : FALSE;
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}
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inline void* Hook_GetTrampoline(uintptr_t target)
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{
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return InlineHook::Instance().GetTrampoline(target);
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}
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