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/*
* Copyright (C) 2012 Tobias Brunner
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "eap_manager.h"
#include <collections/linked_list.h>
#include <threading/rwlock.h>
typedef struct private_eap_manager_t private_eap_manager_t;
typedef struct eap_entry_t eap_entry_t;
/**
* EAP constructor entry
*/
struct eap_entry_t {
/**
* EAP method type, vendor specific if vendor is set
*/
eap_type_t type;
/**
* vendor ID, 0 for default EAP methods
*/
u_int32_t vendor;
/**
* Role of the method returned by the constructor, EAP_SERVER or EAP_PEER
*/
eap_role_t role;
/**
* constructor function to create instance
*/
eap_constructor_t constructor;
};
/**
* private data of eap_manager
*/
struct private_eap_manager_t {
/**
* public functions
*/
eap_manager_t public;
/**
* list of eap_entry_t's
*/
linked_list_t *methods;
/**
* rwlock to lock methods
*/
rwlock_t *lock;
};
METHOD(eap_manager_t, add_method, void,
private_eap_manager_t *this, eap_type_t type, u_int32_t vendor,
eap_role_t role, eap_constructor_t constructor)
{
eap_entry_t *entry = malloc_thing(eap_entry_t);
entry->type = type;
entry->vendor = vendor;
entry->role = role;
entry->constructor = constructor;
this->lock->write_lock(this->lock);
this->methods->insert_last(this->methods, entry);
this->lock->unlock(this->lock);
}
METHOD(eap_manager_t, remove_method, void,
private_eap_manager_t *this, eap_constructor_t constructor)
{
enumerator_t *enumerator;
eap_entry_t *entry;
this->lock->write_lock(this->lock);
enumerator = this->methods->create_enumerator(this->methods);
while (enumerator->enumerate(enumerator, &entry))
{
if (constructor == entry->constructor)
{
this->methods->remove_at(this->methods, enumerator);
free(entry);
}
}
enumerator->destroy(enumerator);
this->lock->unlock(this->lock);
}
/**
* filter the registered methods
*/
static bool filter_methods(uintptr_t role, eap_entry_t **entry,
eap_type_t *type, void *in, u_int32_t *vendor)
{
if ((*entry)->role != (eap_role_t)role)
{
return FALSE;
}
if ((*entry)->vendor == 0 &&
((*entry)->type < 4 || (*entry)->type == EAP_EXPANDED ||
(*entry)->type > EAP_EXPERIMENTAL))
{ /* filter invalid types */
return FALSE;
}
if (type)
{
*type = (*entry)->type;
}
if (vendor)
{
*vendor = (*entry)->vendor;
}
return TRUE;
}
METHOD(eap_manager_t, create_enumerator, enumerator_t*,
private_eap_manager_t *this, eap_role_t role)
{
this->lock->read_lock(this->lock);
return enumerator_create_cleaner(
enumerator_create_filter(
this->methods->create_enumerator(this->methods),
(void*)filter_methods, (void*)(uintptr_t)role, NULL),
(void*)this->lock->unlock, this->lock);
}
METHOD(eap_manager_t, create_instance, eap_method_t*,
private_eap_manager_t *this, eap_type_t type, u_int32_t vendor,
eap_role_t role, identification_t *server, identification_t *peer)
{
enumerator_t *enumerator;
eap_entry_t *entry;
eap_method_t *method = NULL;
this->lock->read_lock(this->lock);
enumerator = this->methods->create_enumerator(this->methods);
while (enumerator->enumerate(enumerator, &entry))
{
if (type == entry->type && vendor == entry->vendor &&
role == entry->role)
{
method = entry->constructor(server, peer);
if (method)
{
break;
}
}
}
enumerator->destroy(enumerator);
this->lock->unlock(this->lock);
return method;
}
METHOD(eap_manager_t, destroy, void,
private_eap_manager_t *this)
{
this->methods->destroy_function(this->methods, free);
this->lock->destroy(this->lock);
free(this);
}
/*
* See header
*/
eap_manager_t *eap_manager_create()
{
private_eap_manager_t *this;
INIT(this,
.public = {
.add_method = _add_method,
.remove_method = _remove_method,
.create_enumerator = _create_enumerator,
.create_instance = _create_instance,
.destroy = _destroy,
},
.methods = linked_list_create(),
.lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
);
return &this->public;
}
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