obs-studio/plugins/win-capture/app-helpers.c

#include <windows.h>
#include <stdio.h>
#include "app-helpers.h"
#include "nt-stuff.h"
#include "util/base.h"

WINADVAPI BOOL WINAPI ConvertSidToStringSidW(PSID sid, LPWSTR *str);

bool is_app(HANDLE process)
{
	DWORD size_ret;
	DWORD ret = 0;
	HANDLE token;

	if (OpenProcessToken(process, TOKEN_QUERY, &token)) {
		BOOL success = GetTokenInformation(token, TokenIsAppContainer, &ret, sizeof(ret), &size_ret);
		if (!success) {
			const DWORD error = GetLastError();
			blog(LOG_ERROR, "is_app GetTokenInformation failed: 0x%08lX", error);
		}

		CloseHandle(token);
	}
	return !!ret;
}

wchar_t *get_app_sid(HANDLE process)
{
	wchar_t *ret = NULL;
	DWORD size_ret;
	BOOL success;
	HANDLE token;

	if (OpenProcessToken(process, TOKEN_QUERY, &token)) {
		DWORD info_len = GetSidLengthRequired(12) + sizeof(TOKEN_APPCONTAINER_INFORMATION);

		PTOKEN_APPCONTAINER_INFORMATION info = malloc(info_len);

		success = GetTokenInformation(token, TokenAppContainerSid, info, info_len, &size_ret);
		if (success)
			ConvertSidToStringSidW(info->TokenAppContainer, &ret);

		free(info);
		CloseHandle(token);
	}

	return ret;
}

static const wchar_t *path_format = L"\\Sessions\\%lu\\AppContainerNamedObjects\\%s\\%s";

HANDLE create_app_mutex(const wchar_t *sid, const wchar_t *name)
{
	wchar_t path[MAX_PATH];
	DWORD session_id = WTSGetActiveConsoleSessionId();
	_snwprintf(path, MAX_PATH, path_format, session_id, sid, name);
	return nt_create_mutex(path);
}

HANDLE open_app_mutex(const wchar_t *sid, const wchar_t *name)
{
	wchar_t path[MAX_PATH];
	DWORD session_id = WTSGetActiveConsoleSessionId();
	_snwprintf(path, MAX_PATH, path_format, session_id, sid, name);
	return nt_open_mutex(path);
}

HANDLE open_app_event(const wchar_t *sid, const wchar_t *name)
{
	wchar_t path[MAX_PATH];
	DWORD session_id = WTSGetActiveConsoleSessionId();
	_snwprintf(path, MAX_PATH, path_format, session_id, sid, name);
	return nt_open_event(path);
}

HANDLE open_app_map(const wchar_t *sid, const wchar_t *name)
{
	wchar_t path[MAX_PATH];
	DWORD session_id = WTSGetActiveConsoleSessionId();
	_snwprintf(path, MAX_PATH, path_format, session_id, sid, name);
	return nt_open_map(path);
}