segatools/mercuryhook/elisabeth.c

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#include <windows.h>
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include "mercuryhook/elisabeth.h"
#include "hook/table.h"
#include "hooklib/dll.h"
#include "hooklib/path.h"
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#include "hooklib/setupapi.h"
#include "util/dprintf.h"
/* Hooks targeted DLLs dynamically loaded by elisabeth. */
static void dll_hook_insert_hooks(HMODULE target);
static HMODULE WINAPI my_LoadLibraryW(const wchar_t *name);
static HMODULE (WINAPI *next_LoadLibraryW)(const wchar_t *name);
static FARPROC WINAPI my_GetProcAddress(HMODULE hModule, const char *name);
static FARPROC (WINAPI *next_GetProcAddress)(HMODULE hModule, const char *name);
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static const struct hook_symbol win32_hooks[] = {
{
.name = "LoadLibraryW",
.patch = my_LoadLibraryW,
.link = (void **) &next_LoadLibraryW,
},
{
.name = "GetProcAddress",
.patch = my_GetProcAddress,
.link = (void **) &next_GetProcAddress
}
};
static const wchar_t *target_modules[] = {
L"USBIntLED.DLL",
L"ftd2XX.dll",
};
static const size_t target_modules_len = _countof(target_modules);
void elisabeth_hook_init()
{
dll_hook_insert_hooks(NULL);
}
static void dll_hook_insert_hooks(HMODULE target)
{
hook_table_apply(
target,
"kernel32.dll",
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win32_hooks,
_countof(win32_hooks));
}
static HMODULE WINAPI my_LoadLibraryW(const wchar_t *name)
{
const wchar_t *name_end;
const wchar_t *target_module;
bool already_loaded;
HMODULE result;
size_t name_len;
size_t target_module_len;
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dprintf("Elisabeth: Trying to load %S\n", name);
if (name == NULL) {
SetLastError(ERROR_INVALID_PARAMETER);
return NULL;
}
// Check if the module is already loaded
already_loaded = GetModuleHandleW(name) != NULL;
// Must call the next handler so the DLL reference count is incremented
result = next_LoadLibraryW(name);
if (!already_loaded && result != NULL) {
name_len = wcslen(name);
for (size_t i = 0; i < target_modules_len; i++) {
target_module = target_modules[i];
target_module_len = wcslen(target_module);
// Check if the newly loaded library is at least the length of
// the name of the target module
if (name_len < target_module_len) {
continue;
}
name_end = &name[name_len - target_module_len];
// Check if the name of the newly loaded library is one of the
// modules the path hooks should be injected into
if (_wcsicmp(name_end, target_module) != 0) {
continue;
}
dprintf("Elisabeth: Loaded %S\n", target_module);
dll_hook_insert_hooks(result);
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setupapi_hook_insert_hooks(result);
}
}
return result;
}
FARPROC WINAPI my_GetProcAddress(HMODULE hModule, const char *name)
{
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uintptr_t ordinal = (uintptr_t) name;
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FARPROC result = next_GetProcAddress(hModule, name);
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if (ordinal > 0xFFFF) {
/* Import by name */
dprintf("Elisabeth: GetProcAddress %s is %p\n", name, result);
}
return result;
}