485 lines
10 KiB
C++
485 lines
10 KiB
C++
#include "hook.hpp"
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#include <map>
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#include "MinHook.hpp"
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#include "concurrency.hpp"
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#include "string.hpp"
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#include "nt.hpp"
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#ifdef max
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#undef max
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#endif
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#ifdef min
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#undef min
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#endif
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namespace utils::hook
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{
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namespace
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{
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uint8_t* allocate_somewhere_near(const void* base_address, const size_t size)
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{
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size_t offset = 0;
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while (true)
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{
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offset += size;
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auto* target_address = static_cast<const uint8_t*>(base_address) - offset;
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if (is_relatively_far(base_address, target_address))
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{
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return nullptr;
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}
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const auto res = VirtualAlloc(const_cast<uint8_t*>(target_address), size, MEM_RESERVE | MEM_COMMIT,
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PAGE_EXECUTE_READWRITE);
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if (res)
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{
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if (is_relatively_far(base_address, target_address))
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{
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VirtualFree(res, 0, MEM_RELEASE);
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return nullptr;
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}
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return static_cast<uint8_t*>(res);
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}
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}
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}
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class memory
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{
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public:
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memory() = default;
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memory(const void* ptr)
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: memory()
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{
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this->length_ = 0x1000;
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this->buffer_ = allocate_somewhere_near(ptr, this->length_);
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if (!this->buffer_)
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{
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throw std::runtime_error("Failed to allocate");
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}
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}
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~memory()
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{
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if (this->buffer_)
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{
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VirtualFree(this->buffer_, 0, MEM_RELEASE);
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}
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}
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memory(memory&& obj) noexcept
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: memory()
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{
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this->operator=(std::move(obj));
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}
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memory& operator=(memory&& obj) noexcept
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{
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if (this != &obj)
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{
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this->~memory();
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this->buffer_ = obj.buffer_;
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this->length_ = obj.length_;
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this->offset_ = obj.offset_;
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obj.buffer_ = nullptr;
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obj.length_ = 0;
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obj.offset_ = 0;
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}
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return *this;
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}
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void* allocate(const size_t length)
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{
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if (!this->buffer_)
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{
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return nullptr;
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}
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if (this->offset_ + length > this->length_)
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{
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return nullptr;
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}
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const auto ptr = this->get_ptr();
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this->offset_ += length;
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return ptr;
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}
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void* get_ptr() const
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{
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return this->buffer_ + this->offset_;
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}
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private:
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uint8_t* buffer_{};
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size_t length_{};
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size_t offset_{};
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};
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void* get_memory_near(const void* address, const size_t size)
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{
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static concurrency::container<std::vector<memory>> memory_container{};
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return memory_container.access<void*>([&](std::vector<memory>& memories)
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{
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for (auto& memory : memories)
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{
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if (!is_relatively_far(address, memory.get_ptr()))
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{
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const auto buffer = memory.allocate(size);
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if (buffer)
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{
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return buffer;
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}
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}
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}
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memories.emplace_back(address);
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return memories.back().allocate(size);
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});
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}
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void* initialize_min_hook()
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{
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static class min_hook_init
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{
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public:
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min_hook_init()
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{
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if (MH_Initialize() != MH_OK)
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{
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throw std::runtime_error("Failed to initialize MinHook");
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}
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}
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~min_hook_init()
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{
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MH_Uninitialize();
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}
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} min_hook_init;
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return &min_hook_init;
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}
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}
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detour::detour()
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{
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(void)initialize_min_hook();
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}
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detour::detour(const size_t place, void* target)
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: detour(reinterpret_cast<void*>(place), target)
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{
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}
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detour::detour(void* place, void* target)
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: detour()
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{
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this->create(place, target);
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}
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detour::~detour()
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{
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this->clear();
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}
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void detour::enable()
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{
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MH_EnableHook(this->place_);
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if (!this->moved_data_.empty())
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{
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this->move();
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}
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}
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void detour::disable()
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{
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this->un_move();
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MH_DisableHook(this->place_);
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}
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void detour::create(void* place, void* target)
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{
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this->clear();
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this->place_ = place;
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if (MH_CreateHook(this->place_, target, &this->original_) != MH_OK)
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{
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//throw std::runtime_error(string::va("Unable to create hook at location: %p", this->place_));
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}
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this->enable();
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}
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void detour::create(const size_t place, void* target)
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{
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MH_Initialize();
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this->create(reinterpret_cast<void*>(place), target);
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}
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void detour::clear()
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{
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if (this->place_)
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{
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this->un_move();
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MH_RemoveHook(this->place_);
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}
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this->place_ = nullptr;
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this->original_ = nullptr;
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this->moved_data_ = {};
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}
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void detour::move()
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{
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this->moved_data_ = move_hook(this->place_);
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}
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void* detour::get_place() const
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{
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return this->place_;
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}
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void* detour::get_original() const
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{
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return this->original_;
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}
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void detour::un_move()
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{
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if (!this->moved_data_.empty())
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{
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copy(this->place_, this->moved_data_.data(), this->moved_data_.size());
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}
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}
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std::optional<std::pair<void*, void*>> iat(const nt::library& library, const std::string& target_library, const std::string& process, void* stub)
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{
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if (!library.is_valid()) return {};
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auto* const ptr = library.get_iat_entry(target_library, process);
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if (!ptr) return {};
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DWORD protect;
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VirtualProtect(ptr, sizeof(*ptr), PAGE_EXECUTE_READWRITE, &protect);
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std::swap(*ptr, stub);
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VirtualProtect(ptr, sizeof(*ptr), protect, &protect);
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return {{ptr, stub}};
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}
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void nop(void* place, const size_t length)
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{
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DWORD old_protect{};
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VirtualProtect(place, length, PAGE_EXECUTE_READWRITE, &old_protect);
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std::memset(place, 0x90, length);
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VirtualProtect(place, length, old_protect, &old_protect);
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FlushInstructionCache(GetCurrentProcess(), place, length);
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}
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void nop(const size_t place, const size_t length)
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{
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nop(reinterpret_cast<void*>(place), length);
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}
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void copy(void* place, const void* data, const size_t length)
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{
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DWORD old_protect{};
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VirtualProtect(place, length, PAGE_EXECUTE_READWRITE, &old_protect);
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std::memmove(place, data, length);
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VirtualProtect(place, length, old_protect, &old_protect);
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FlushInstructionCache(GetCurrentProcess(), place, length);
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}
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void copy(const size_t place, const void* data, const size_t length)
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{
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copy(reinterpret_cast<void*>(place), data, length);
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}
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void copy_string(void* place, const char* str)
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{
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copy(reinterpret_cast<void*>(place), str, strlen(str) + 1);
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}
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void copy_string(const size_t place, const char* str)
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{
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copy_string(reinterpret_cast<void*>(place), str);
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}
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bool is_relatively_far(const void* pointer, const void* data, const int offset)
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{
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const int64_t diff = size_t(data) - (size_t(pointer) + offset);
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const auto small_diff = int32_t(diff);
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return diff != int64_t(small_diff);
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}
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void call(void* pointer, void* data)
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{
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if (is_relatively_far(pointer, data))
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{
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auto* trampoline = get_memory_near(pointer, 14);
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if (!trampoline)
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{
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throw std::runtime_error("Too far away to create 32bit relative branch");
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}
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call(pointer, trampoline);
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jump(trampoline, data, true, true);
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return;
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}
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uint8_t copy_data[5];
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copy_data[0] = 0xE8;
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*reinterpret_cast<int32_t*>(©_data[1]) = int32_t(size_t(data) - (size_t(pointer) + 5));
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auto* patch_pointer = PBYTE(pointer);
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copy(patch_pointer, copy_data, sizeof(copy_data));
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}
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void call(const size_t pointer, void* data)
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{
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return call(reinterpret_cast<void*>(pointer), data);
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}
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void call(const size_t pointer, const size_t data)
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{
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return call(pointer, reinterpret_cast<void*>(data));
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}
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void jump(void* pointer, void* data, const bool use_far, const bool use_safe)
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{
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static const unsigned char jump_data[] = {
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0x48, 0xb8, 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11, 0xff, 0xe0
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};
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static const unsigned char jump_data_safe[] = {
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0xFF, 0x25, 0x00, 0x00, 0x00, 0x00
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};
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if (!use_far && is_relatively_far(pointer, data))
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{
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auto* trampoline = get_memory_near(pointer, 14);
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if (!trampoline)
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{
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throw std::runtime_error("Too far away to create 32bit relative branch");
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}
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jump(pointer, trampoline, false, false);
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jump(trampoline, data, true, true);
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return;
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}
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auto* patch_pointer = PBYTE(pointer);
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if (use_far)
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{
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if (use_safe)
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{
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uint8_t copy_data[sizeof(jump_data_safe) + sizeof(data)];
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memcpy(copy_data, jump_data_safe, sizeof(jump_data_safe));
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memcpy(copy_data + sizeof(jump_data_safe), &data, sizeof(data));
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copy(patch_pointer, copy_data, sizeof(copy_data));
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}
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else
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{
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uint8_t copy_data[sizeof(jump_data)];
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memcpy(copy_data, jump_data, sizeof(jump_data));
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memcpy(copy_data + 2, &data, sizeof(data));
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copy(patch_pointer, copy_data, sizeof(copy_data));
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}
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}
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else
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{
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uint8_t copy_data[5];
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copy_data[0] = 0xE9;
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*reinterpret_cast<int32_t*>(©_data[1]) = int32_t(size_t(data) - (size_t(pointer) + 5));
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copy(patch_pointer, copy_data, sizeof(copy_data));
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}
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}
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void jump(const size_t pointer, void* data, const bool use_far, const bool use_safe)
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{
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return jump(reinterpret_cast<void*>(pointer), data, use_far, use_safe);
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}
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void jump(const size_t pointer, const size_t data, const bool use_far, const bool use_safe)
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{
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return jump(pointer, reinterpret_cast<void*>(data), use_far, use_safe);
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}
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void inject(void* pointer, const void* data)
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{
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if (is_relatively_far(pointer, data, 4))
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{
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throw std::runtime_error("Too far away to create 32bit relative branch");
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}
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set<int32_t>(pointer, int32_t(size_t(data) - (size_t(pointer) + 4)));
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}
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void inject(const size_t pointer, const void* data)
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{
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return inject(reinterpret_cast<void*>(pointer), data);
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}
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std::vector<uint8_t> move_hook(void* pointer)
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{
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std::vector<uint8_t> original_data{};
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auto* data_ptr = static_cast<uint8_t*>(pointer);
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if (data_ptr[0] == 0xE9)
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{
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original_data.resize(6);
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memmove(original_data.data(), pointer, original_data.size());
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auto* target = follow_branch(data_ptr);
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nop(data_ptr, 1);
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jump(data_ptr + 1, target);
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}
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else if (data_ptr[0] == 0xFF && data_ptr[1] == 0x25)
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{
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original_data.resize(15);
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memmove(original_data.data(), pointer, original_data.size());
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copy(data_ptr + 1, data_ptr, 14);
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nop(data_ptr, 1);
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}
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else
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{
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throw std::runtime_error("No branch instruction found");
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}
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return original_data;
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}
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std::vector<uint8_t> move_hook(const size_t pointer)
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{
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return move_hook(reinterpret_cast<void*>(pointer));
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}
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void* follow_branch(void* address)
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{
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auto* const data = static_cast<uint8_t*>(address);
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if (*data != 0xE8 && *data != 0xE9)
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{
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throw std::runtime_error("No branch instruction found");
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}
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return extract<void*>(data + 1);
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}
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}
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