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/*
* 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 <stdint.h>
#include "credential_factory.h"
#include <debug.h>
#include <utils/linked_list.h>
#include <threading/thread_value.h>
#include <threading/rwlock.h>
#include <credentials/certificates/x509.h>
ENUM(credential_type_names, CRED_PRIVATE_KEY, CRED_CERTIFICATE,
"CRED_PRIVATE_KEY",
"CRED_PUBLIC_KEY",
"CRED_CERTIFICATE",
"CRED_PLUTO_CERT",
);
typedef struct private_credential_factory_t private_credential_factory_t;
/**
* private data of credential_factory
*/
struct private_credential_factory_t {
/**
* public functions
*/
credential_factory_t public;
/**
* list with entry_t
*/
linked_list_t *constructors;
/**
* Thread specific recursiveness counter
*/
thread_value_t *recursive;
/**
* lock access to builders
*/
rwlock_t *lock;
};
typedef struct entry_t entry_t;
struct entry_t {
/** kind of credential builder */
credential_type_t type;
/** subtype of credential, e.g. certificate_type_t */
int subtype;
/** builder function */
builder_function_t constructor;
};
/**
* Implementation of credential_factory_t.add_builder_constructor.
*/
static void add_builder(private_credential_factory_t *this,
credential_type_t type, int subtype,
builder_function_t constructor)
{
entry_t *entry = malloc_thing(entry_t);
entry->type = type;
entry->subtype = subtype;
entry->constructor = constructor;
this->lock->write_lock(this->lock);
this->constructors->insert_last(this->constructors, entry);
this->lock->unlock(this->lock);
}
/**
* Implementation of credential_factory_t.remove_builder.
*/
static void remove_builder(private_credential_factory_t *this,
builder_function_t constructor)
{
enumerator_t *enumerator;
entry_t *entry;
this->lock->write_lock(this->lock);
enumerator = this->constructors->create_enumerator(this->constructors);
while (enumerator->enumerate(enumerator, &entry))
{
if (entry->constructor == constructor)
{
this->constructors->remove_at(this->constructors, enumerator);
free(entry);
}
}
enumerator->destroy(enumerator);
this->lock->unlock(this->lock);
}
/**
* Implementation of credential_factory_t.create.
*/
static void* create(private_credential_factory_t *this, credential_type_t type,
int subtype, ...)
{
enumerator_t *enumerator;
entry_t *entry;
va_list args;
void *construct = NULL;
int failures = 0;
uintptr_t level;
level = (uintptr_t)this->recursive->get(this->recursive);
this->recursive->set(this->recursive, (void*)level + 1);
this->lock->read_lock(this->lock);
enumerator = this->constructors->create_enumerator(this->constructors);
while (enumerator->enumerate(enumerator, &entry))
{
if (entry->type == type && entry->subtype == subtype)
{
va_start(args, subtype);
construct = entry->constructor(subtype, args);
va_end(args);
if (construct)
{
break;
}
failures++;
}
}
enumerator->destroy(enumerator);
this->lock->unlock(this->lock);
if (!construct && !level)
{
enum_name_t *names = key_type_names;
if (type == CRED_CERTIFICATE)
{
names = certificate_type_names;
}
DBG1(DBG_LIB, "building %N - %N failed, tried %d builders",
credential_type_names, type, names, subtype, failures);
}
this->recursive->set(this->recursive, (void*)level);
return construct;
}
/**
* Implementation of credential_factory_t.destroy
*/
static void destroy(private_credential_factory_t *this)
{
this->constructors->destroy_function(this->constructors, free);
this->recursive->destroy(this->recursive);
this->lock->destroy(this->lock);
free(this);
}
/*
* see header file
*/
credential_factory_t *credential_factory_create()
{
private_credential_factory_t *this = malloc_thing(private_credential_factory_t);
this->public.create = (void*(*)(credential_factory_t*, credential_type_t type, int subtype, ...))create;
this->public.add_builder = (void(*)(credential_factory_t*,credential_type_t type, int subtype, builder_function_t constructor))add_builder;
this->public.remove_builder = (void(*)(credential_factory_t*,builder_function_t constructor))remove_builder;
this->public.destroy = (void(*)(credential_factory_t*))destroy;
this->constructors = linked_list_create();
this->recursive = thread_value_create(NULL);
this->lock = rwlock_create(RWLOCK_TYPE_DEFAULT);
return &this->public;
}
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