wnetcaps.c

/********************************************************************

   WNetCaps.c

   Returns net status

   Copyright (c) Microsoft Corporation. All rights reserved.
   Licensed under the MIT License.

********************************************************************/

#include "winfile.h"
#include "wnetcaps.h"


/////////////////////////////////////////////////////////////////////
//
// Name:     WNetStat
//
// Synopsis: Caches and returns requested network status information
//
// IN        nIndex  NS_* request
//                   NS_REFRESH refreshes cached info
//
// Return:   BOOL    on NS_* => answer
//                   on NS_REFRESH => unstable (FALSE)
//
// Assumes:  nIndex < 1 << 31 and  nIndex an even power of 2
//
// Effects:
//
//
// Notes:
//
/////////////////////////////////////////////////////////////////////

BOOL
WNetStat(INT nIndex)
{
   static DWORD fdwRet = (DWORD)-1;
   DWORD dwError;

   BOOL bNetwork = FALSE;
   BOOL bConnect = FALSE;

   HKEY hKey;

   DWORD dwcbBuffer = 0;

   if (
//
// Disable NS_REFRESH since we test for network installed on disk,
// not network services started.
//
#if NSREFRESH
      NS_REFRESH == nIndex ||
#endif
      (DWORD) -1 == fdwRet) {

      fdwRet = 0;

      //
      // Check for connection dialog
      //

      dwError = RegOpenKey(HKEY_LOCAL_MACHINE,
         TEXT("System\\CurrentControlSet\\Control\\NetworkProvider\\Order"),
         &hKey);

      if (!dwError) {

         dwError = RegQueryValueEx(hKey,
            TEXT("ProviderOrder"),
            NULL,
            NULL,
            NULL,
            &dwcbBuffer);

         if (ERROR_SUCCESS == dwError && dwcbBuffer > 1) {

            bNetwork = TRUE;
         }

         RegCloseKey(hKey);
      }

      if (bNetwork) {
#if 0
         //
         // Check the registry to see if the user can make connections
         //
         dwError = RegOpenKey(HKEY_CURRENT_USER,
            TEXT("Software\\Microsoft\\Windows NT\\CurrentVersion\\File Manager\\Settings"),
            &hKey);

         if (dwError != ERROR_SUCCESS) {
            bConnect = TRUE;
         } else {

            cb = sizeof(dwTemp);
            dwTemp = 0;

            dwError = RegQueryValueEx(hKey, TEXT("Network"),
               NULL, NULL, (LPBYTE)&dwTemp, &cb);

            if (dwError != ERROR_SUCCESS || dwTemp)
               bConnect = TRUE;

            RegCloseKey(hKey);
         }


         if (bConnect) {
            fdwRet |= NS_CONNECTDLG|NS_CONNECT;
         }
#else
         fdwRet |= NS_CONNECTDLG|NS_CONNECT;
#endif
      }

      //
      // Check for share-ability
      //

      dwError = RegOpenKey(HKEY_LOCAL_MACHINE,
         TEXT("System\\CurrentControlSet\\Services\\LanmanServer"),
         &hKey);

      if (!dwError) {

         fdwRet |= NS_SHAREDLG|NS_PROPERTYDLG;
         RegCloseKey(hKey);
      }
   }

   return fdwRet & nIndex ? TRUE : FALSE;
}