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/*
* Copyright (C) 2010-2012 Tobias Brunner
* HSR Hochschule fuer Technik Rapperswil
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* 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 "socket_manager.h"
#include <daemon.h>
#include <threading/thread.h>
#include <threading/rwlock.h>
#include <collections/linked_list.h>
typedef struct private_socket_manager_t private_socket_manager_t;
/**
* Private data of an socket_manager_t object.
*/
struct private_socket_manager_t {
/**
* Public socket_manager_t interface.
*/
socket_manager_t public;
/**
* List of registered socket constructors
*/
linked_list_t *sockets;
/**
* Instantiated socket implementation
*/
socket_t *socket;
/**
* The constructor used to create the current socket
*/
socket_constructor_t create;
/**
* Lock for sockets list
*/
rwlock_t *lock;
};
METHOD(socket_manager_t, receiver, status_t,
private_socket_manager_t *this, packet_t **packet)
{
status_t status;
this->lock->read_lock(this->lock);
if (!this->socket)
{
DBG1(DBG_NET, "no socket implementation registered, receiving failed");
this->lock->unlock(this->lock);
return NOT_SUPPORTED;
}
/* receive is blocking and the thread can be cancelled */
thread_cleanup_push((thread_cleanup_t)this->lock->unlock, this->lock);
status = this->socket->receive(this->socket, packet);
thread_cleanup_pop(TRUE);
return status;
}
METHOD(socket_manager_t, sender, status_t,
private_socket_manager_t *this, packet_t *packet)
{
status_t status;
this->lock->read_lock(this->lock);
if (!this->socket)
{
DBG1(DBG_NET, "no socket implementation registered, sending failed");
this->lock->unlock(this->lock);
return NOT_SUPPORTED;
}
status = this->socket->send(this->socket, packet);
this->lock->unlock(this->lock);
return status;
}
METHOD(socket_manager_t, get_port, uint16_t,
private_socket_manager_t *this, bool nat_t)
{
uint16_t port = 0;
this->lock->read_lock(this->lock);
if (this->socket)
{
port = this->socket->get_port(this->socket, nat_t);
}
this->lock->unlock(this->lock);
return port;
}
METHOD(socket_manager_t, supported_families, socket_family_t,
private_socket_manager_t *this)
{
socket_family_t families = SOCKET_FAMILY_NONE;
this->lock->read_lock(this->lock);
if (this->socket)
{
families = this->socket->supported_families(this->socket);
}
this->lock->unlock(this->lock);
return families;
}
static void create_socket(private_socket_manager_t *this)
{
socket_constructor_t create;
/* remove constructors in order to avoid trying to create broken ones
* multiple times */
while (this->sockets->remove_first(this->sockets,
(void**)&create) == SUCCESS)
{
this->socket = create();
if (this->socket)
{
this->create = create;
break;
}
}
}
METHOD(socket_manager_t, add_socket, void,
private_socket_manager_t *this, socket_constructor_t create)
{
this->lock->write_lock(this->lock);
this->sockets->insert_last(this->sockets, create);
if (!this->socket)
{
create_socket(this);
}
this->lock->unlock(this->lock);
}
METHOD(socket_manager_t, remove_socket, void,
private_socket_manager_t *this, socket_constructor_t create)
{
this->lock->write_lock(this->lock);
this->sockets->remove(this->sockets, create, NULL);
if (this->create == create)
{
this->socket->destroy(this->socket);
this->socket = NULL;
this->create = NULL;
create_socket(this);
}
this->lock->unlock(this->lock);
}
METHOD(socket_manager_t, destroy, void,
private_socket_manager_t *this)
{
DESTROY_IF(this->socket);
this->sockets->destroy(this->sockets);
this->lock->destroy(this->lock);
free(this);
}
/**
* See header
*/
socket_manager_t *socket_manager_create()
{
private_socket_manager_t *this;
INIT(this,
.public = {
.send = _sender,
.receive = _receiver,
.get_port = _get_port,
.supported_families = _supported_families,
.add_socket = _add_socket,
.remove_socket = _remove_socket,
.destroy = _destroy,
},
.sockets = linked_list_create(),
.lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
);
return &this->public;
}
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