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///////////////////////////////////////////////////////////////////////////////
///
/// Written 2012, Oliver Schneider (assarbad.net) - PUBLIC DOMAIN/CC0
///
/// Original filename: isadmin.c
/// Project : WinDirStat
/// Author(s) : Oliver Schneider
///
/// Purpose : Lua function, implemented in C, to check whether the
/// user is privileged or not.
///
///////////////////////////////////////////////////////////////////////////////
#include <Windows.h>
#include <tchar.h>
#include <lua.h>
BOOL static IsAdmin_()
{
SID_IDENTIFIER_AUTHORITY NtAuthority = SECURITY_NT_AUTHORITY;
PSID pSid;
if (AllocateAndInitializeSid(&NtAuthority, 2, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0, &pSid))
{
BOOL bResult = FALSE;
if (!CheckTokenMembership( NULL, pSid, &bResult))
{
FreeSid(pSid);
return FALSE;
}
FreeSid(pSid);
return bResult;
}
return FALSE;
}
static int luaC_isadmin_(lua_State* L)
{
static int *pcachedResult = NULL;
if(!pcachedResult)
{
static int cachedResult = 0;
cachedResult = (IsAdmin_()) ? 1 : 0;
pcachedResult = &cachedResult;
}
lua_pushboolean(L, *pcachedResult);
return 1;
}
LUA_API const luaL_Reg isadmin_funcs[] = {
{"isadmin", luaC_isadmin_},
{NULL, NULL}
};
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