51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
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#pragma once
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#include <functional>
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class Hook;
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map<uintptr_t, shared_ptr<Hook>> hooks;
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class Hook {
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private:
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DWORD protect;
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void* orig;
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void* detour;
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uint8_t orig_bytes[6];
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uint8_t jmp_bytes[6];
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public:
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Hook(void* func, void* detour) {
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cout << "Hooking: " << func << " -> " << detour << endl;
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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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VirtualProtect(func, 16, PAGE_EXECUTE_READWRITE, &(this->protect));
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memcpy(this->orig_bytes, this->orig, 1 + 4 + 1);
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memcpy(this->orig, this->jmp_bytes, 1 + 4 + 1);
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hooks[src]=shared_ptr<Hook>(this);
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}
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~Hook() {
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cout << "Unhooking: " << this->detour << " -> " << this->orig << endl;
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uintptr_t src = reinterpret_cast<uintptr_t>(this->orig);
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memcpy(this->orig, this->orig_bytes, 1 + 4 + 1);
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}
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void disable() {
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memcpy(this->orig, this->orig_bytes, 1 + 4 + 1);
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}
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void enable() {
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memcpy(this->orig, this->jmp_bytes, 1 + 4 + 1);
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}
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void* func() {
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return this->orig;
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}
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};
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