142 lines
3.3 KiB
C++
142 lines
3.3 KiB
C++
#pragma once
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#include <functional>
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class Hook
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{
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private:
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MEMORY_BASIC_INFORMATION mbi;
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void *orig;
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void *detour;
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bool enabled;
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uint8_t orig_bytes[6];
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uint8_t jmp_bytes[6];
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static map<uintptr_t, shared_ptr<Hook>> hooks;
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public:
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Hook(void *func, void *detour)
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{
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uintptr_t dest = reinterpret_cast<uintptr_t>(detour);
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uintptr_t src = reinterpret_cast<uintptr_t>(func);
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this->orig = func;
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this->detour = detour;
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this->jmp_bytes[0] = 0x68; // push
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this->jmp_bytes[1] = (dest >> 0) & 0xff;
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this->jmp_bytes[2] = (dest >> 8) & 0xff;
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this->jmp_bytes[3] = (dest >> 16) & 0xff;
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this->jmp_bytes[4] = (dest >> 24) & 0xff;
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this->jmp_bytes[5] = 0xC3; // ret
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VirtualQuery(func, &mbi, sizeof(mbi));
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VirtualProtect(mbi.BaseAddress, mbi.RegionSize, PAGE_EXECUTE_READWRITE, &mbi.Protect);
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memcpy(this->orig_bytes, this->orig, 1 + 4 + 1);
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VirtualProtect(mbi.BaseAddress, mbi.RegionSize, mbi.Protect, NULL);
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this->enabled = false;
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}
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~Hook()
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{
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cout << "Unhooking: [" << this->orig << " <- " << this->detour << "]" << endl;
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this->disable();
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}
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static void addr(void *addr, void *detour)
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{
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cout << "Hooking: [" << addr << " -> " << detour << "]" << endl;
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uintptr_t key = reinterpret_cast<uintptr_t>(detour);
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hooks[key] = make_shared<Hook>(addr, detour);
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hooks[key]->enable();
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}
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static void module(const char *mod, const char *func, void *detour)
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{
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cout << "Hooking: [" << mod << "]." << func << " -> " << detour << endl;
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void *addr = GetProcAddress(GetModuleHandle(mod), func);
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if (addr != NULL)
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{
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Hook::addr(addr, detour);
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}
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else
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{
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cerr << "[" << mod << "]." << func << " not found!" << endl;
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};
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}
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static shared_ptr<Hook> get(void *func)
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{
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uintptr_t addr = reinterpret_cast<uintptr_t>(func);
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return Hook::get(addr);
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}
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static shared_ptr<Hook> get(uintptr_t addr)
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{
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return hooks.at(addr);
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}
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static size_t drop(void *func)
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{
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uintptr_t addr = reinterpret_cast<uintptr_t>(func);
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return Hook::drop(addr);
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}
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static size_t drop(uintptr_t addr)
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{
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return hooks.erase(addr);
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}
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static void clear()
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{
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cout << "Clearing Hooks" << endl;
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for (pair<uintptr_t, shared_ptr<Hook>> h : hooks)
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{
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h.second->disable();
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}
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return hooks.clear();
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}
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void disable()
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{
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if (enabled)
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{
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//cout << "Disabling: [" << this->orig << " <- " << this->detour << "]" << endl;
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VirtualProtect(mbi.BaseAddress, mbi.RegionSize, PAGE_EXECUTE_READWRITE, NULL);
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memcpy(this->orig, this->orig_bytes, 1 + 4 + 1);
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VirtualProtect(mbi.BaseAddress, mbi.RegionSize, mbi.Protect, NULL);
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enabled = false;
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}
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}
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void enable()
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{
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if (!enabled)
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{
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//cout << "Enabling: [" << this->orig << " -> " << this->detour << "]" << endl;
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VirtualProtect(mbi.BaseAddress, mbi.RegionSize, PAGE_EXECUTE_READWRITE, NULL);
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memcpy(this->orig, this->jmp_bytes, 1 + 4 + 1);
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VirtualProtect(mbi.BaseAddress, mbi.RegionSize, mbi.Protect, NULL);
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enabled = true;
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}
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}
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void *get_orig()
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{
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return this->orig;
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}
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template <typename F, typename... Args>
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void func_void(Args... args)
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{
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disable();
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reinterpret_cast<F>(this->orig)(args...);
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enable();
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return;
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}
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template <typename F, typename... Args>
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decltype(auto) func(Args... args)
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{
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disable();
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auto ret = reinterpret_cast<F>(this->orig)(args...);
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enable();
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return ret;
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}
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};
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map<uintptr_t, shared_ptr<Hook>> Hook::hooks;
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