libsecurity_cssm/lib/module.cpp

   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 // module - CSSM Module objects
  27 //
  28 #include "module.h"
  29 #include "manager.h"
  30 #include "attachment.h"
  31 #include <security_cdsa_utilities/cssmbridge.h>
  32
  33
  34 //
  35 // Module object construction.
  36 //
  37 Module::Module(CssmManager *mgr, const MdsComponent &info, Plugin *plug)
  38 : MdsComponent(info), cssm(*mgr), plugin(plug)
  39 {
  40     // invoke module's load entry (tell it it's being loaded)
  41     if (CSSM_RETURN err = plugin->load(&gGuidCssm, // CSSM's Guid
  42             &myGuid(),                  // module's Guid
  43             spiEventRelay, this)) {
  44         plugin->unload();
  45         CssmError::throwMe(err);        // self-destruct this module
  46     }
  47 }
  48
  49
  50 //
  51 // Destroy the module object.
  52 // The unload() method must have succeeded and returned true before
  53 // you get to delete a Module. A destructor is too precarious a place
  54 // to negotiate with a plugin...
  55 //
  56 Module::~Module()
  57 {
  58 }
  59
  60
  61 bool Module::unload(const ModuleCallback &callback)
  62 {
  63     StLock<Mutex> _(mLock);
  64     // locked module - no more attachment creations possible
  65     if (callbackCount() == 1) {
  66         // would be last callback if successful, check for actual unload
  67         if (attachmentCount() > 0)
  68             CssmError::throwMe(CSSM_ERRCODE_FUNCTION_FAILED);   // @# module is busy
  69         // no attachments active - we are idle and ready to unload
  70         if (CSSM_RETURN err = plugin->unload(&gGuidCssm, // CSSM's Guid
  71                 &myGuid(),              // module's Guid
  72                 spiEventRelay, this)) // our callback
  73             CssmError::throwMe(err);    // tough...
  74         // okay, commit
  75         remove(callback);
  76         plugin->unload();
  77         return true;
  78     } else {
  79         // more callbacks - we're not going to unload
  80         remove(callback);
  81         return false;
  82     }
  83 }
  84
  85
  86 //
  87 // Create a new attachment for this module
  88 //
  89 CSSM_HANDLE Module::attach(const CSSM_VERSION &version,
  90                            uint32 subserviceId,
  91                            CSSM_SERVICE_TYPE subserviceType,
  92                            const CSSM_API_MEMORY_FUNCS &memoryOps,
  93                            CSSM_ATTACH_FLAGS attachFlags,
  94                            CSSM_KEY_HIERARCHY keyHierarchy,
  95                            CSSM_FUNC_NAME_ADDR *functionTable,
  96                            uint32 functionTableSize)
  97 {
  98     StLock<Mutex> _(mLock);
  99
 100     // check if the module can do this kind of service
 101     if (!supportsService(subserviceType))
 102         CssmError::throwMe(CSSMERR_CSSM_INVALID_SERVICE_MASK);
 103
 104     Attachment *attachment = cssm.attachmentMakerFor(subserviceType)->make(this,
 105                                    version,
 106                                    subserviceId, subserviceType,
 107                                    memoryOps,
 108                                    attachFlags,
 109                                    keyHierarchy,
 110                                    functionTable, functionTableSize);
 111
 112     try {
 113         // add to module's attachment map
 114         attachmentMap.insert(AttachmentMap::value_type(attachment->handle(), attachment));
 115     } catch (...) {
 116         delete attachment;
 117         throw;
 118     }
 119
 120     // all done
 121     return attachment->handle();
 122 }
 123
 124
 125 //
 126 // Detach an Attachment from this module.
 127 // THREADS: Requires the attachment to be idled out, i.e. caller
 128 //  is responsible for keeping more users from entering it.
 129 //
 130 void Module::detach(Attachment *attachment)
 131 {
 132     StLock<Mutex> _(mLock);
 133     attachmentMap.erase(attachment->handle());
 134 }
 135
 136
 137 //
 138 // Handle events sent by the loaded module.
 139 //
 140 void Module::spiEvent(CSSM_MODULE_EVENT event,
 141                       const Guid &guid,
 142                       uint32 subserviceId,
 143                       CSSM_SERVICE_TYPE serviceType)
 144 {
 145     StLock<Mutex> _(mLock);
 146     if (guid != myGuid())
 147         CssmError::throwMe(CSSM_ERRCODE_INTERNAL_ERROR);
 148     callbackSet(event, guid, subserviceId, serviceType);
 149 }
 150
 151 // static shim
 152 CSSM_RETURN Module::spiEventRelay(const CSSM_GUID *ModuleGuid,
 153                                    void *Context,
 154                                    uint32 SubserviceId,
 155                                    CSSM_SERVICE_TYPE ServiceType,
 156                                    CSSM_MODULE_EVENT EventType)
 157 {
 158     BEGIN_API
 159     static_cast<Module *>(Context)->spiEvent(EventType,
 160                                              Guid::required(ModuleGuid),
 161                                              SubserviceId,
 162                                              ServiceType);
 163     END_API(CSSM)
 164 }