spicetools/hooks/libraryhook.cpp

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2024-08-28 15:10:34 +00:00
#include "libraryhook.h"
#include "external/robin_hood.h"
#include "util/detour.h"
#include "util/logging.h"
#include "util/utils.h"
static bool LHOOK_ENABLED = false;
static robin_hood::unordered_map<std::string, HMODULE> LIBRARIES_A;
static robin_hood::unordered_map<std::wstring, HMODULE> LIBRARIES_W;
static robin_hood::unordered_map<std::string, FARPROC> PROCS;
static decltype(LoadLibraryA) *LoadLibraryA_orig = nullptr;
static decltype(LoadLibraryW) *LoadLibraryW_orig = nullptr;
static decltype(GetModuleHandleA) *GetModuleHandleA_orig = nullptr;
static decltype(GetModuleHandleW) *GetModuleHandleW_orig = nullptr;
static decltype(GetProcAddress) *GetProcAddress_orig = nullptr;
static HMODULE WINAPI LoadLibraryA_hook(LPCTSTR lpFileName) {
// check hooks
if (lpFileName) {
auto module = LIBRARIES_A.find(lpFileName);
if (module != LIBRARIES_A.end()) {
return module->second;
}
}
// fallback
return LoadLibraryA_orig(lpFileName);
}
static HMODULE WINAPI LoadLibraryW_hook(LPCWSTR lpFileName) {
// check hooks
if (lpFileName) {
auto module = LIBRARIES_W.find(lpFileName);
if (module != LIBRARIES_W.end()) {
return module->second;
}
}
// fallback
return LoadLibraryW_orig(lpFileName);
}
static HMODULE WINAPI GetModuleHandleA_hook(LPCSTR lpModuleName) {
// check hooks
if (lpModuleName) {
auto module = LIBRARIES_A.find(lpModuleName);
if (module != LIBRARIES_A.end()) {
return module->second;
}
}
// fallback
return GetModuleHandleA_orig(lpModuleName);
}
static HMODULE WINAPI GetModuleHandleW_hook(LPCWSTR lpModuleName) {
// check hooks
if (lpModuleName) {
auto module = LIBRARIES_W.find(lpModuleName);
if (module != LIBRARIES_W.end()) {
return module->second;
}
}
// fallback
return GetModuleHandleW_orig(lpModuleName);
}
static FARPROC WINAPI GetProcAddress_hook(HMODULE hModule, LPCSTR lpProcName) {
// check for ordinal
if (reinterpret_cast<uintptr_t>(lpProcName) <= UINT16_MAX) {
// fallback
return GetProcAddress_orig(hModule, lpProcName);
}
// check hooks
if (lpProcName) {
auto proc = PROCS.find(lpProcName);
if (proc != PROCS.end()) {
return proc->second;
}
}
// fallback
return GetProcAddress_orig(hModule, lpProcName);
}
void libraryhook_enable(HMODULE module) {
log_info("libraryhook", "LibraryHook Attach");
if (LHOOK_ENABLED) {
return;
}
// detour
detour::trampoline_try("kernel32.dll", "LoadLibraryA", LoadLibraryA_hook, &LoadLibraryA_orig);
detour::trampoline_try("kernel32.dll", "LoadLibraryW", LoadLibraryW_hook, &LoadLibraryW_orig);
detour::trampoline_try("kernel32.dll", "GetModuleHandleA", GetModuleHandleA_hook, &GetModuleHandleA_orig);
detour::trampoline_try("kernel32.dll", "GetModuleHandleW", GetModuleHandleW_hook, &GetModuleHandleW_orig);
detour::trampoline_try("kernel32.dll", "GetProcAddress", GetProcAddress_hook, &GetProcAddress_orig);
// set enabled
LHOOK_ENABLED = true;
}
void libraryhook_hook_library(std::string library_name, HMODULE library_address) {
// add library to list
LIBRARIES_W.insert_or_assign(s2ws(library_name), library_address);
LIBRARIES_A.insert_or_assign(std::move(library_name), library_address);
}
void libraryhook_hook_proc(std::string proc_name, FARPROC proc_address) {
// add proc to list
PROCS.insert_or_assign(std::move(proc_name), proc_address);
}