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mid_hook.cpp
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#include <algorithm>
#include <array>
#include "safetyhook/allocator.hpp"
#include "safetyhook/inline_hook.hpp"
#include "safetyhook/utility.hpp"
#include "safetyhook/mid_hook.hpp"
namespace safetyhook {
#if SAFETYHOOK_ARCH_X86_64
#if SAFETYHOOK_OS_WINDOWS
constexpr std::array<uint8_t, 391> asm_data = {0xFF, 0x35, 0x79, 0x01, 0x00, 0x00, 0x54, 0x54, 0x55, 0x50, 0x53, 0x51,
0x52, 0x56, 0x57, 0x41, 0x50, 0x41, 0x51, 0x41, 0x52, 0x41, 0x53, 0x41, 0x54, 0x41, 0x55, 0x41, 0x56, 0x41, 0x57,
0x9C, 0x48, 0x81, 0xEC, 0x00, 0x01, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x7F, 0xBC, 0x24, 0xF0, 0x00, 0x00, 0x00, 0xF3,
0x44, 0x0F, 0x7F, 0xB4, 0x24, 0xE0, 0x00, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x7F, 0xAC, 0x24, 0xD0, 0x00, 0x00, 0x00,
0xF3, 0x44, 0x0F, 0x7F, 0xA4, 0x24, 0xC0, 0x00, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x7F, 0x9C, 0x24, 0xB0, 0x00, 0x00,
0x00, 0xF3, 0x44, 0x0F, 0x7F, 0x94, 0x24, 0xA0, 0x00, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x7F, 0x8C, 0x24, 0x90, 0x00,
0x00, 0x00, 0xF3, 0x44, 0x0F, 0x7F, 0x84, 0x24, 0x80, 0x00, 0x00, 0x00, 0xF3, 0x0F, 0x7F, 0x7C, 0x24, 0x70, 0xF3,
0x0F, 0x7F, 0x74, 0x24, 0x60, 0xF3, 0x0F, 0x7F, 0x6C, 0x24, 0x50, 0xF3, 0x0F, 0x7F, 0x64, 0x24, 0x40, 0xF3, 0x0F,
0x7F, 0x5C, 0x24, 0x30, 0xF3, 0x0F, 0x7F, 0x54, 0x24, 0x20, 0xF3, 0x0F, 0x7F, 0x4C, 0x24, 0x10, 0xF3, 0x0F, 0x7F,
0x04, 0x24, 0x48, 0x8B, 0x8C, 0x24, 0x80, 0x01, 0x00, 0x00, 0x48, 0x83, 0xC1, 0x10, 0x48, 0x89, 0x8C, 0x24, 0x80,
0x01, 0x00, 0x00, 0x48, 0x8D, 0x0C, 0x24, 0x48, 0x89, 0xE3, 0x48, 0x83, 0xEC, 0x30, 0x48, 0x83, 0xE4, 0xF0, 0xFF,
0x15, 0xA8, 0x00, 0x00, 0x00, 0x48, 0x89, 0xDC, 0xF3, 0x0F, 0x6F, 0x04, 0x24, 0xF3, 0x0F, 0x6F, 0x4C, 0x24, 0x10,
0xF3, 0x0F, 0x6F, 0x54, 0x24, 0x20, 0xF3, 0x0F, 0x6F, 0x5C, 0x24, 0x30, 0xF3, 0x0F, 0x6F, 0x64, 0x24, 0x40, 0xF3,
0x0F, 0x6F, 0x6C, 0x24, 0x50, 0xF3, 0x0F, 0x6F, 0x74, 0x24, 0x60, 0xF3, 0x0F, 0x6F, 0x7C, 0x24, 0x70, 0xF3, 0x44,
0x0F, 0x6F, 0x84, 0x24, 0x80, 0x00, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x6F, 0x8C, 0x24, 0x90, 0x00, 0x00, 0x00, 0xF3,
0x44, 0x0F, 0x6F, 0x94, 0x24, 0xA0, 0x00, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x6F, 0x9C, 0x24, 0xB0, 0x00, 0x00, 0x00,
0xF3, 0x44, 0x0F, 0x6F, 0xA4, 0x24, 0xC0, 0x00, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x6F, 0xAC, 0x24, 0xD0, 0x00, 0x00,
0x00, 0xF3, 0x44, 0x0F, 0x6F, 0xB4, 0x24, 0xE0, 0x00, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x6F, 0xBC, 0x24, 0xF0, 0x00,
0x00, 0x00, 0x48, 0x81, 0xC4, 0x00, 0x01, 0x00, 0x00, 0x9D, 0x41, 0x5F, 0x41, 0x5E, 0x41, 0x5D, 0x41, 0x5C, 0x41,
0x5B, 0x41, 0x5A, 0x41, 0x59, 0x41, 0x58, 0x5F, 0x5E, 0x5A, 0x59, 0x5B, 0x58, 0x5D, 0x48, 0x8D, 0x64, 0x24, 0x08,
0x5C, 0xC3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
#elif SAFETYHOOK_OS_LINUX
constexpr std::array<uint8_t, 391> asm_data = {0xFF, 0x35, 0x79, 0x01, 0x00, 0x00, 0x54, 0x54, 0x55, 0x50, 0x53, 0x51,
0x52, 0x56, 0x57, 0x41, 0x50, 0x41, 0x51, 0x41, 0x52, 0x41, 0x53, 0x41, 0x54, 0x41, 0x55, 0x41, 0x56, 0x41, 0x57,
0x9C, 0x48, 0x81, 0xEC, 0x00, 0x01, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x7F, 0xBC, 0x24, 0xF0, 0x00, 0x00, 0x00, 0xF3,
0x44, 0x0F, 0x7F, 0xB4, 0x24, 0xE0, 0x00, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x7F, 0xAC, 0x24, 0xD0, 0x00, 0x00, 0x00,
0xF3, 0x44, 0x0F, 0x7F, 0xA4, 0x24, 0xC0, 0x00, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x7F, 0x9C, 0x24, 0xB0, 0x00, 0x00,
0x00, 0xF3, 0x44, 0x0F, 0x7F, 0x94, 0x24, 0xA0, 0x00, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x7F, 0x8C, 0x24, 0x90, 0x00,
0x00, 0x00, 0xF3, 0x44, 0x0F, 0x7F, 0x84, 0x24, 0x80, 0x00, 0x00, 0x00, 0xF3, 0x0F, 0x7F, 0x7C, 0x24, 0x70, 0xF3,
0x0F, 0x7F, 0x74, 0x24, 0x60, 0xF3, 0x0F, 0x7F, 0x6C, 0x24, 0x50, 0xF3, 0x0F, 0x7F, 0x64, 0x24, 0x40, 0xF3, 0x0F,
0x7F, 0x5C, 0x24, 0x30, 0xF3, 0x0F, 0x7F, 0x54, 0x24, 0x20, 0xF3, 0x0F, 0x7F, 0x4C, 0x24, 0x10, 0xF3, 0x0F, 0x7F,
0x04, 0x24, 0x48, 0x8B, 0xBC, 0x24, 0x80, 0x01, 0x00, 0x00, 0x48, 0x83, 0xC7, 0x10, 0x48, 0x89, 0xBC, 0x24, 0x80,
0x01, 0x00, 0x00, 0x48, 0x8D, 0x3C, 0x24, 0x48, 0x89, 0xE3, 0x48, 0x83, 0xEC, 0x30, 0x48, 0x83, 0xE4, 0xF0, 0xFF,
0x15, 0xA8, 0x00, 0x00, 0x00, 0x48, 0x89, 0xDC, 0xF3, 0x0F, 0x6F, 0x04, 0x24, 0xF3, 0x0F, 0x6F, 0x4C, 0x24, 0x10,
0xF3, 0x0F, 0x6F, 0x54, 0x24, 0x20, 0xF3, 0x0F, 0x6F, 0x5C, 0x24, 0x30, 0xF3, 0x0F, 0x6F, 0x64, 0x24, 0x40, 0xF3,
0x0F, 0x6F, 0x6C, 0x24, 0x50, 0xF3, 0x0F, 0x6F, 0x74, 0x24, 0x60, 0xF3, 0x0F, 0x6F, 0x7C, 0x24, 0x70, 0xF3, 0x44,
0x0F, 0x6F, 0x84, 0x24, 0x80, 0x00, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x6F, 0x8C, 0x24, 0x90, 0x00, 0x00, 0x00, 0xF3,
0x44, 0x0F, 0x6F, 0x94, 0x24, 0xA0, 0x00, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x6F, 0x9C, 0x24, 0xB0, 0x00, 0x00, 0x00,
0xF3, 0x44, 0x0F, 0x6F, 0xA4, 0x24, 0xC0, 0x00, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x6F, 0xAC, 0x24, 0xD0, 0x00, 0x00,
0x00, 0xF3, 0x44, 0x0F, 0x6F, 0xB4, 0x24, 0xE0, 0x00, 0x00, 0x00, 0xF3, 0x44, 0x0F, 0x6F, 0xBC, 0x24, 0xF0, 0x00,
0x00, 0x00, 0x48, 0x81, 0xC4, 0x00, 0x01, 0x00, 0x00, 0x9D, 0x41, 0x5F, 0x41, 0x5E, 0x41, 0x5D, 0x41, 0x5C, 0x41,
0x5B, 0x41, 0x5A, 0x41, 0x59, 0x41, 0x58, 0x5F, 0x5E, 0x5A, 0x59, 0x5B, 0x58, 0x5D, 0x48, 0x8D, 0x64, 0x24, 0x08,
0x5C, 0xC3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
#endif
#elif SAFETYHOOK_ARCH_X86_32
constexpr std::array<uint8_t, 171> asm_data = {0xFF, 0x35, 0xA7, 0x00, 0x00, 0x00, 0x54, 0x54, 0x55, 0x50, 0x53, 0x51,
0x52, 0x56, 0x57, 0x9C, 0x81, 0xEC, 0x80, 0x00, 0x00, 0x00, 0xF3, 0x0F, 0x7F, 0x7C, 0x24, 0x70, 0xF3, 0x0F, 0x7F,
0x74, 0x24, 0x60, 0xF3, 0x0F, 0x7F, 0x6C, 0x24, 0x50, 0xF3, 0x0F, 0x7F, 0x64, 0x24, 0x40, 0xF3, 0x0F, 0x7F, 0x5C,
0x24, 0x30, 0xF3, 0x0F, 0x7F, 0x54, 0x24, 0x20, 0xF3, 0x0F, 0x7F, 0x4C, 0x24, 0x10, 0xF3, 0x0F, 0x7F, 0x04, 0x24,
0x8B, 0x8C, 0x24, 0xA0, 0x00, 0x00, 0x00, 0x83, 0xC1, 0x08, 0x89, 0x8C, 0x24, 0xA0, 0x00, 0x00, 0x00, 0x54, 0xFF,
0x15, 0xA3, 0x00, 0x00, 0x00, 0x83, 0xC4, 0x04, 0xF3, 0x0F, 0x6F, 0x04, 0x24, 0xF3, 0x0F, 0x6F, 0x4C, 0x24, 0x10,
0xF3, 0x0F, 0x6F, 0x54, 0x24, 0x20, 0xF3, 0x0F, 0x6F, 0x5C, 0x24, 0x30, 0xF3, 0x0F, 0x6F, 0x64, 0x24, 0x40, 0xF3,
0x0F, 0x6F, 0x6C, 0x24, 0x50, 0xF3, 0x0F, 0x6F, 0x74, 0x24, 0x60, 0xF3, 0x0F, 0x6F, 0x7C, 0x24, 0x70, 0x81, 0xC4,
0x80, 0x00, 0x00, 0x00, 0x9D, 0x5F, 0x5E, 0x5A, 0x59, 0x5B, 0x58, 0x5D, 0x8D, 0x64, 0x24, 0x04, 0x5C, 0xC3, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
#endif
std::expected<MidHook, MidHook::Error> MidHook::create(void* target, MidHookFn destination, Flags flags) {
return create(Allocator::global(), target, destination, flags);
}
std::expected<MidHook, MidHook::Error> MidHook::create(
const std::shared_ptr<Allocator>& allocator, void* target, MidHookFn destination, Flags flags) {
MidHook hook{};
if (const auto setup_result = hook.setup(allocator, reinterpret_cast<uint8_t*>(target), destination);
!setup_result) {
return tl::unexpected{setup_result.error()};
}
if (!(flags & StartDisabled)) {
if (auto enable_result = hook.enable(); !enable_result) {
return tl::unexpected{enable_result.error()};
}
}
return hook;
}
MidHook::MidHook(MidHook&& other) noexcept {
*this = std::move(other);
}
MidHook& MidHook::operator=(MidHook&& other) noexcept {
if (this != &other) {
m_hook = std::move(other.m_hook);
m_target = other.m_target;
m_stub = std::move(other.m_stub);
m_destination = other.m_destination;
other.m_target = 0;
other.m_destination = nullptr;
}
return *this;
}
void MidHook::reset() {
*this = {};
}
std::expected<void, MidHook::Error> MidHook::setup(
const std::shared_ptr<Allocator>& allocator, uint8_t* target, MidHookFn destination_fn) {
m_target = target;
m_destination = destination_fn;
auto stub_allocation = allocator->allocate(asm_data.size());
if (!stub_allocation) {
return tl::unexpected{Error::bad_allocation(stub_allocation.error())};
}
m_stub = std::move(*stub_allocation);
std::copy(asm_data.begin(), asm_data.end(), m_stub.data());
#if SAFETYHOOK_ARCH_X86_64
store(m_stub.data() + sizeof(asm_data) - 16, m_destination);
#elif SAFETYHOOK_ARCH_X86_32
store(m_stub.data() + sizeof(asm_data) - 8, m_destination);
// 32-bit has some relocations we need to fix up as well.
store(m_stub.data() + 0x02, m_stub.data() + m_stub.size() - 4);
store(m_stub.data() + 0x59, m_stub.data() + m_stub.size() - 8);
#endif
auto hook_result = InlineHook::create(allocator, m_target, m_stub.data(), InlineHook::StartDisabled);
if (!hook_result) {
m_stub.free();
return tl::unexpected{Error::bad_inline_hook(hook_result.error())};
}
m_hook = std::move(*hook_result);
#if SAFETYHOOK_ARCH_X86_64
store(m_stub.data() + sizeof(asm_data) - 8, m_hook.trampoline().data());
#elif SAFETYHOOK_ARCH_X86_32
store(m_stub.data() + sizeof(asm_data) - 4, m_hook.trampoline().data());
#endif
return {};
}
std::expected<void, MidHook::Error> MidHook::enable() {
if (auto enable_result = m_hook.enable(); !enable_result) {
return tl::unexpected{Error::bad_inline_hook(enable_result.error())};
}
return {};
}
std::expected<void, MidHook::Error> MidHook::disable() {
if (auto disable_result = m_hook.disable(); !disable_result) {
return tl::unexpected{Error::bad_inline_hook(disable_result.error())};
}
return {};
}
} // namespace safetyhook