segatools/unityhook/hook.c

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#include <assert.h>
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#include <stdbool.h>
#include "hook/table.h"
#include "hooklib/path.h"
#include "util/dprintf.h"
#include "doorstop.h"
#include "hook.h"
static bool unity_hook_initted;
static struct unity_config unity_config;
static const wchar_t *target_modules[] = {
L"mono.dll",
L"mono-2.0-bdwgc.dll",
L"cri_ware_unity.dll",
};
static const size_t target_modules_len = _countof(target_modules);
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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 const struct hook_symbol unity_kernel32_syms[] = {
{
.name = "LoadLibraryW",
.patch = my_LoadLibraryW,
.link = (void **) &next_LoadLibraryW,
},
};
void unity_hook_init(const struct unity_config *cfg, HINSTANCE self) {
assert(cfg != NULL);
if (!cfg->enable) {
return;
}
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if (unity_hook_initted) {
return;
}
memcpy(&unity_config, cfg, sizeof(*cfg));
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dll_hook_insert_hooks(NULL);
unity_hook_initted = true;
dprintf("Unity: Hook enabled.\n");
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}
static void dll_hook_insert_hooks(HMODULE target) {
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hook_table_apply(
target,
"kernel32.dll",
unity_kernel32_syms,
_countof(unity_kernel32_syms));
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}
static HMODULE WINAPI my_LoadLibraryW(const wchar_t *name) {
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const wchar_t *name_end;
const wchar_t *target_module;
bool already_loaded;
HMODULE result;
size_t name_len;
size_t target_module_len;
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);
// mono entrypoint for injecting target_assembly
if (GetProcAddress(result, "mono_jit_init_version")) {
doorstop_mono_hook_init(&unity_config, result);
}
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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("Unity: Loaded %S\n", target_module);
dll_hook_insert_hooks(result);
path_hook_insert_hooks(result);
}
}
return result;
}