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win-capture/graphics-hook: Don't allow multiple hooks 

Prevents multiple separate hook DLLs from being loaded in to a target at
once.  This is done just in the off-chance that someone might add
another hook to the Vulkan layer registry.
master
jp9000 2020-02-27 05:09:24 -08:00
parent e55a2b4331
commit a20f1168a7
1 changed files with 31 additions and 0 deletions
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31
plugins/win-capture/graphics-hook/graphics-hook.c
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@ -37,6 +37,7 @@ static HANDLE filemap_hook_info = NULL;
static HINSTANCE dll_inst = NULL;
static volatile bool stop_loop = false;
static HANDLE dup_hook_mutex = NULL;
static HANDLE capture_thread = NULL;
char system_path[MAX_PATH] = {0};
char process_name[MAX_PATH] = {0};
@ -272,6 +273,7 @@ static void free_hook(void)
close_handle(&signal_ready);
close_handle(&signal_stop);
close_handle(&signal_restart);
close_handle(&dup_hook_mutex);
ipc_pipe_client_free(&pipe);
}
@ -786,6 +788,30 @@ void capture_free(void)
active = false;
}
#define HOOK_NAME L"graphics_hook_dup_mutex"
static inline HANDLE open_mutex_plus_id(const wchar_t *name, DWORD id)
{
wchar_t new_name[64];
_snwprintf(new_name, 64, L"%s%lu", name, id);
return open_mutex(new_name);
}
static bool init_dll(void)
{
DWORD pid = GetCurrentProcessId();
HANDLE h;
h = open_mutex_plus_id(HOOK_NAME, pid);
if (h) {
CloseHandle(h);
return false;
}
dup_hook_mutex = create_mutex_plus_id(HOOK_NAME, pid);
return !!dup_hook_mutex;
}
BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID unused1)
{
if (reason == DLL_PROCESS_ATTACH) {
@ -793,6 +819,11 @@ BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID unused1)
dll_inst = hinst;
if (!init_dll()) {
DbgOut("Duplicate hook library");
return false;
}
HANDLE cur_thread;
bool success = DuplicateHandle(GetCurrentProcess(),
GetCurrentThread(),