libsecurity_cssm/lib/modloader.h

   1 /*
   2  * Copyright (c) 2000-2001,2003-2004 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24
  25 //
  26 // modloader.h - CSSM module loader interface
  27 //
  28 // This is a thin abstraction of plugin module loading/handling for CSSM.
  29 // The resulting module ("Plugin") notion is specific to CSSM plugin modules.
  30 // This implementation uses MacOS X bundles.
  31 //
  32 #ifndef _H_MODLOADER
  33 #define _H_MODLOADER
  34
  35 #include <exception>
  36 #include <security_utilities/osxcode.h>
  37 #include "cssmint.h"
  38 #include <map>
  39 #include <string>
  40
  41
  42 namespace Security {
  43
  44
  45 //
  46 // A collection of canonical plugin entry points (aka CSSM module SPI)
  47 //
  48 struct PluginFunctions {
  49         CSSM_SPI_ModuleLoadFunction *load;
  50         CSSM_SPI_ModuleUnloadFunction *unload;
  51         CSSM_SPI_ModuleAttachFunction *attach;
  52         CSSM_SPI_ModuleDetachFunction *detach;
  53 };
  54
  55
  56 //
  57 // An abstract representation of a loadable plugin.
  58 // Note that "loadable" doesn't mean that actual code loading
  59 // is necessarily happening, but let's just assume it might.
  60 //
  61 class Plugin {
  62     NOCOPY(Plugin)
  63 public:
  64     Plugin() { }
  65     virtual ~Plugin() { }
  66
  67     virtual void load() = 0;
  68     virtual void unload() = 0;
  69     virtual bool isLoaded() const = 0;
  70
  71         virtual CSSM_SPI_ModuleLoadFunction load = 0;
  72         virtual CSSM_SPI_ModuleUnloadFunction unload = 0;
  73         virtual CSSM_SPI_ModuleAttachFunction attach = 0;
  74         virtual CSSM_SPI_ModuleDetachFunction detach = 0;
  75 };
  76
  77
  78 //
  79 // The supervisor class that manages searching and loading.
  80 //
  81 class ModuleLoader {
  82     NOCOPY(ModuleLoader)
  83 public:
  84     ModuleLoader();
  85
  86     Plugin *operator () (const string &path);
  87
  88 private:
  89     // the table of all loaded modules
  90     typedef map<string, Plugin *> PluginTable;
  91     PluginTable mPlugins;
  92 };
  93
  94
  95
  96 } // end namespace Security
  97
  98
  99 #endif //_H_MODLOADER