text: /***************************************************************************
   *                                  _   _ ____  _
   *  Project                     ___| | | |  _ \| |
   *                             / __| | | | |_) | |
   *                            | (__| |_| |  _ <| |___
   *                             \___|\___/|_| \_\_____|
   *
   * Copyright (C) 2016, Steve Holme, <steve_holme@hotmail.com>.
   *
   * This software is licensed as described in the file COPYING, which
   * you should have received as part of this distribution. The terms
   * are also available at https://curl.haxx.se/docs/copyright.html.
   *
   * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   * copies of the Software, and permit persons to whom the Software is
   * furnished to do so, under the terms of the COPYING file.
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   * KIND, either express or implied.
   *
   ***************************************************************************/
  
  #include "curl_setup.h"
  
  #if defined(WIN32)
  
  #include <curl/curl.h>
  #include "system_win32.h"
  
  /* The last #include files should be: */
  #include "curl_memory.h"
  #include "memdebug.h"
  
  #if defined(USE_WINDOWS_SSPI) || (!defined(CURL_DISABLE_TELNET) && \
                                    defined(USE_WINSOCK))
  
  
  #if !defined(LOAD_WITH_ALTERED_SEARCH_PATH)
  #define LOAD_WITH_ALTERED_SEARCH_PATH  0x00000008
  #endif
  
  #if !defined(LOAD_LIBRARY_SEARCH_SYSTEM32)
  #define LOAD_LIBRARY_SEARCH_SYSTEM32   0x00000800
  #endif
  
  /* We use our own typedef here since some headers might lack these */
  typedef HMODULE (APIENTRY *LOADLIBRARYEX_FN)(LPCTSTR, HANDLE, DWORD);
  
  /* See function definitions in winbase.h */
  #ifdef UNICODE
  #  ifdef _WIN32_WCE
  #    define LOADLIBARYEX  L"LoadLibraryExW"
  #  else
  #    define LOADLIBARYEX  "LoadLibraryExW"
  #  endif
  #else
  #  define LOADLIBARYEX    "LoadLibraryExA"
  #endif
  
  #endif /* USE_WINDOWS_SSPI || (!CURL_DISABLE_TELNET && USE_WINSOCK) */
  
  /*
   * Curl_verify_windows_version()
   *
   * This is used to verify if we are running on a specific windows version.
   *
   * Parameters:
   *
   * majorVersion [in] - The major version number.
   * minorVersion [in] - The minor version number.
   * platform     [in] - The optional platform identifer.
   * condition    [in] - The test condition used to specifier whether we are
   *                     checking a version less then, equal to or greater than
   *                     what is specified in the major and minor version
   *                     numbers.
   *
   * Returns TRUE if matched; otherwise FALSE.
   */
  bool Curl_verify_windows_version(const unsigned int majorVersion,
                                   const unsigned int minorVersion,
                                   const PlatformIdentifier platform,
                                   const VersionCondition condition)
  {
      bool matched = FALSE;
  
  #if !defined(_WIN32_WINNT) || !defined(_WIN32_WINNT_WIN2K) || \
      (_WIN32_WINNT < _WIN32_WINNT_WIN2K)
    OSVERSIONINFO osver;
  
    memset(&osver, 0, sizeof(osver));
    osver.dwOSVersionInfoSize = sizeof(osver);
  
      /* Find out Windows version */
    if(GetVersionEx(&osver)) {
      /* Verify the Operating System version number */
      switch(condition) {
      case VERSION_LESS_THAN:
        if(osver.dwMajorVersion < majorVersion ||
          (osver.dwMajorVersion == majorVersion &&
           osver.dwMinorVersion < minorVersion))
          matched = TRUE;
        break;
  
      case VERSION_LESS_THAN_EQUAL:
        if(osver.dwMajorVersion <= majorVersion &&
           osver.dwMinorVersion <= minorVersion)
          matched = TRUE;
        break;
  
      case VERSION_EQUAL:
        if(osver.dwMajorVersion == majorVersion &&
           osver.dwMinorVersion == minorVersion)
          matched = TRUE;
        break;
  
      case VERSION_GREATER_THAN_EQUAL:
        if(osver.dwMajorVersion >= majorVersion &&
           osver.dwMinorVersion >= minorVersion)
          matched = TRUE;
        break;
  
      case VERSION_GREATER_THAN:
        if(osver.dwMajorVersion > majorVersion ||
          (osver.dwMajorVersion == majorVersion &&
           osver.dwMinorVersion > minorVersion))
          matched = TRUE;
        break;
      }
  
      /* Verify the platform identifier (if necessary) */
      if(matched && platform != PLATFORM_DONT_CARE) {
        switch(platform) {
        case PLATFORM_WINDOWS:
          if(osver.dwPlatformId != VER_PLATFORM_WIN32_WINDOWS)
            matched = FALSE;
          break;
  
        case PLATFORM_WINNT:
          if(osver.dwPlatformId != VER_PLATFORM_WIN32_NT)
            matched = FALSE;
        }
      }
    }
  #else
      ULONGLONG cm = 0;
      OSVERSIONINFOEX osver;
      BYTE majorCondition;
      BYTE minorCondition;
      BYTE spMajorCondition;
      BYTE spMinorCondition;
  
      switch (condition)
      {
      case VERSION_LESS_THAN:
          majorCondition = VER_LESS;
          minorCondition = VER_LESS;
          spMajorCondition = VER_LESS_EQUAL;
          spMinorCondition = VER_LESS_EQUAL;
          break;
  
      case VERSION_LESS_THAN_EQUAL:
          majorCondition = VER_LESS_EQUAL;
          minorCondition = VER_LESS_EQUAL;
          spMajorCondition = VER_LESS_EQUAL;
          spMinorCondition = VER_LESS_EQUAL;
          break;
  
      case VERSION_EQUAL:
          majorCondition = VER_EQUAL;
          minorCondition = VER_EQUAL;
          spMajorCondition = VER_GREATER_EQUAL;
          spMinorCondition = VER_GREATER_EQUAL;
          break;
  
      case VERSION_GREATER_THAN_EQUAL:
          majorCondition = VER_GREATER_EQUAL;
          minorCondition = VER_GREATER_EQUAL;
          spMajorCondition = VER_GREATER_EQUAL;
          spMinorCondition = VER_GREATER_EQUAL;
          break;
  
      case VERSION_GREATER_THAN:
          majorCondition = VER_GREATER;
          minorCondition = VER_GREATER;
          spMajorCondition = VER_GREATER_EQUAL;
          spMinorCondition = VER_GREATER_EQUAL;
          break;
  
      default:
          return FALSE;
      }
  
      memset(&osver, 0, sizeof(osver));
      osver.dwOSVersionInfoSize = sizeof(osver);
      osver.dwMajorVersion = majorVersion;
      osver.dwMinorVersion = minorVersion;
      if (platform == PLATFORM_WINDOWS)
          osver.dwPlatformId = VER_PLATFORM_WIN32_WINDOWS;
      else if (platform == PLATFORM_WINNT)
          osver.dwPlatformId = VER_PLATFORM_WIN32_NT;
  
      cm = VerSetConditionMask(cm, VER_MAJORVERSION, majorCondition);
      cm = VerSetConditionMask(cm, VER_MINORVERSION, minorCondition);
      cm = VerSetConditionMask(cm, VER_SERVICEPACKMAJOR, spMajorCondition);
      cm = VerSetConditionMask(cm, VER_SERVICEPACKMINOR, spMinorCondition);
      if (platform != PLATFORM_DONT_CARE)
          cm = VerSetConditionMask(cm, VER_PLATFORMID, VER_EQUAL);
  
      if (VerifyVersionInfo(&osver, (VER_MAJORVERSION | VER_MINORVERSION |
                                VER_SERVICEPACKMAJOR | VER_SERVICEPACKMINOR),
                            cm))
          matched = TRUE;
  #endif
  
      return matched;
  }
  
  #if defined(USE_WINDOWS_SSPI) || (!defined(CURL_DISABLE_TELNET) && \
                                    defined(USE_WINSOCK))
  
  /*
   * Curl_load_library()
   *
   * This is used to dynamically load DLLs using the most secure method available
   * for the version of Windows that we are running on.
   *
   * Parameters:
   *
   * filename  [in] - The filename or full path of the DLL to load. If only the
   *                  filename is passed then the DLL will be loaded from the
   *                  Windows system directory.
   *
   * Returns the handle of the module on success; otherwise NULL.
   */
  HMODULE Curl_load_library(LPCTSTR filename)
  {
      HMODULE hModule = NULL;
      LOADLIBRARYEX_FN pLoadLibraryEx = NULL;
  
      /* Get a handle to kernel32 so we can access it's functions at runtime */
      HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32"));
      if (!hKernel32)
          return NULL;
  
      /* Attempt to find LoadLibraryEx() which is only available on Windows 2000
         and above */
      pLoadLibraryEx = (LOADLIBRARYEX_FN)GetProcAddress(hKernel32, LOADLIBARYEX);
  
      /* Detect if there's already a path in the filename and load the library if
         there is. Note: Both back slashes and forward slashes have been supported
         since the earlier days of DOS at an API level although they are not
         supported by command prompt */
      if (_tcspbrk(filename, TEXT("\\/")))
      {
          /** !checksrc! disable BANNEDFUNC 1 **/
          hModule = pLoadLibraryEx ?
                        pLoadLibraryEx(filename, NULL, LOAD_WITH_ALTERED_SEARCH_PATH) :
                        LoadLibrary(filename);
      }
      /* Detect if KB2533623 is installed, as LOAD_LIBARY_SEARCH_SYSTEM32 is only
         supported on Windows Vista, Windows Server 2008, Windows 7 and Windows
         Server 2008 R2 with this patch or natively on Windows 8 and above */
      else if (pLoadLibraryEx && GetProcAddress(hKernel32, "AddDllDirectory"))
      {
          /* Load the DLL from the Windows system directory */
          hModule = pLoadLibraryEx(filename, NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);
      }
      else
      {
          /* Attempt to get the Windows system path */
          UINT systemdirlen = GetSystemDirectory(NULL, 0);
          if (systemdirlen)
          {
              /* Allocate space for the full DLL path (Room for the null terminator
                 is included in systemdirlen) */
              size_t filenamelen = _tcslen(filename);
              TCHAR* path = malloc(sizeof(TCHAR) * (systemdirlen + 1 + filenamelen));
              if (path && GetSystemDirectory(path, systemdirlen))
              {
                  /* Calculate the full DLL path */
                  _tcscpy(path + _tcslen(path), TEXT("\\"));
                  _tcscpy(path + _tcslen(path), filename);
  
                  /* Load the DLL from the Windows system directory */
                  /** !checksrc! disable BANNEDFUNC 1 **/
                  hModule = pLoadLibraryEx ?
                                pLoadLibraryEx(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH) :
                                LoadLibrary(path);
              }
              free(path);
          }
      }
  
      return hModule;
  }
  
  #endif /* USE_WINDOWS_SSPI || (!CURL_DISABLE_TELNET && USE_WINSOCK) */
  
  #endif /* WIN32 */
  