Security/libsecurity_cssm/lib/modloader.cpp

   1 /*
   2  * Copyright (c) 2000-2001,2003-2004,2011,2014 Apple 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 // cssm module loader interface - MACOS X (CFBundle/DYLD) version.
  27 //
  28 // This file provides a C++-style interface to CFBundles as managed by the CF-style
  29 // system interfaces. The implementation looks a bit, well, hybrid - but the visible
  30 // interfaces are pure C++.
  31 //
  32 #include "modloader.h"
  33 #include "modload_plugin.h"
  34 # include "modload_static.h"
  35
  36
  37 namespace Security {
  38
  39
  40 //
  41 // Pull in functions for built-in plugin modules
  42 //
  43 #define BUILTIN(suffix) \
  44         extern "C" CSSM_SPI_ModuleLoadFunction CSSM_SPI_ModuleLoad ## suffix; \
  45         extern "C" CSSM_SPI_ModuleUnloadFunction CSSM_SPI_ModuleUnload ## suffix; \
  46         extern "C" CSSM_SPI_ModuleAttachFunction CSSM_SPI_ModuleAttach ## suffix; \
  47         extern "C" CSSM_SPI_ModuleDetachFunction CSSM_SPI_ModuleDetach ## suffix; \
  48         static const PluginFunctions builtin ## suffix = { \
  49                 CSSM_SPI_ModuleLoad ## suffix, CSSM_SPI_ModuleUnload ## suffix, \
  50                 CSSM_SPI_ModuleAttach ## suffix, CSSM_SPI_ModuleDetach ## suffix \
  51         };
  52
  53 BUILTIN(__apple_csp)
  54 BUILTIN(__apple_file_dl)
  55 BUILTIN(__apple_cspdl)
  56 BUILTIN(__apple_x509_cl)
  57 BUILTIN(__apple_x509_tp)
  58 BUILTIN(__sd_cspdl)
  59
  60
  61 //
  62 // Construct the canonical ModuleLoader object
  63 //
  64 ModuleLoader::ModuleLoader()
  65 {
  66 #if !defined(NO_BUILTIN_PLUGINS)
  67     mPlugins["*AppleCSP"] = new StaticPlugin(builtin__apple_csp);
  68     mPlugins["*AppleDL"] = new StaticPlugin(builtin__apple_file_dl);
  69     mPlugins["*AppleCSPDL"] = new StaticPlugin(builtin__apple_cspdl);
  70     mPlugins["*AppleX509CL"] = new StaticPlugin(builtin__apple_x509_cl);
  71     mPlugins["*AppleX509TP"] = new StaticPlugin(builtin__apple_x509_tp);
  72     mPlugins["*SDCSPDL"] = new StaticPlugin(builtin__sd_cspdl);
  73 #endif //NO_BUILTIN_PLUGINS
  74 }
  75
  76
  77 //
  78 // "Load" a plugin, given its MDS path. At this layer, we are performing
  79 // a purely physical load operation. No code in the plugin is called.
  80 // If "built-in plugins" are enabled, the moduleTable will come pre-initialized
  81 // with certain paths. Since we consult this table before going to disk, this
  82 // means that we'll pick these up first *as long as the paths match exactly*.
  83 // There is nothing magical in the path strings themselves, other than by
  84 // convention. (The convention is "*NAME", which conveniently does not match
  85 // any actual file path.)
  86 //
  87 Plugin *ModuleLoader::operator () (const string &path)
  88 {
  89     Plugin * &plugin = mPlugins[path];
  90     if (!plugin) {
  91                 secdebug("cssm", "ModuleLoader(): creating plugin %s", path.c_str());
  92         plugin = new LoadablePlugin(path.c_str());
  93         }
  94         else {
  95                 secdebug("cssm", "ModuleLoader(): FOUND plugin %s, isLoaded %s",
  96                         path.c_str(), plugin->isLoaded() ? "TRUE" : "FALSE");
  97                 if(!plugin->isLoaded()) {
  98                         plugin->load();
  99                 }
 100         }
 101     return plugin;
 102 }
 103
 104
 105 }       // end namespace Security