Donetsk/hook_lib/common/utils/hook.cpp
2023-10-09 16:54:34 +01:00

485 lines
10 KiB
C++

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