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/**
* @file dead_peer_detection.c
*
* @brief Implementation of the dead_peer_detection transaction.
*
*/
/*
* Copyright (C) 2006 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 "dead_peer_detection.h"
#include <daemon.h>
typedef struct private_dead_peer_detection_t private_dead_peer_detection_t;
/**
* Private members of a dead_peer_detection_t object..
*/
struct private_dead_peer_detection_t {
/**
* Public methods and transaction_t interface.
*/
dead_peer_detection_t public;
/**
* Assigned IKE_SA.
*/
ike_sa_t *ike_sa;
/**
* Message sent by our peer, if already generated
*/
message_t *message;
/**
* Message ID this transaction uses
*/
u_int32_t message_id;
/**
* Times we did send the request
*/
u_int32_t requested;
/**
* Assigned logger.
*/
logger_t *logger;
};
/**
* Implementation of transaction_t.get_message_id.
*/
static u_int32_t get_message_id(private_dead_peer_detection_t *this)
{
return this->message_id;
}
/**
* Implementation of transaction_t.requested.
*/
static u_int32_t requested(private_dead_peer_detection_t *this)
{
return this->requested++;
}
/**
* Implementation of transaction_t.get_request.
*/
static status_t get_request(private_dead_peer_detection_t *this, message_t **result)
{
message_t *request;
connection_t *connection;
host_t *me, *other;
/* check if we already have built a message (retransmission) */
if (this->message)
{
*result = this->message;
return SUCCESS;
}
connection = this->ike_sa->get_connection(this->ike_sa);
me = connection->get_my_host(connection);
other = connection->get_other_host(connection);
/* build the request */
request = message_create();
request->set_source(request, me->clone(me));
request->set_destination(request, other->clone(other));
request->set_exchange_type(request, INFORMATIONAL);
request->set_request(request, TRUE);
this->message_id = this->ike_sa->get_next_message_id(this->ike_sa);
request->set_message_id(request, this->message_id);
request->set_ike_sa_id(request, this->ike_sa->get_id(this->ike_sa));
/* apply for caller */
*result = request;
/* store for retransmission */
this->message = request;
return SUCCESS;
}
/**
* Implementation of transaction_t.get_response.
*/
static status_t get_response(private_dead_peer_detection_t *this, message_t *request,
message_t **result, transaction_t **next)
{
host_t *me, *other;
message_t *response;
connection_t *connection;
/* check if we already have built a response (retransmission) */
if (this->message)
{
*result = this->message;
return SUCCESS;
}
connection = this->ike_sa->get_connection(this->ike_sa);
me = connection->get_my_host(connection);
other = connection->get_other_host(connection);
this->message_id = request->get_message_id(request);
/* set up response */
response = message_create();
response->set_source(response, me->clone(me));
response->set_destination(response, other->clone(other));
response->set_exchange_type(response, INFORMATIONAL);
response->set_request(response, FALSE);
response->set_message_id(response, this->message_id);
response->set_ike_sa_id(response, this->ike_sa->get_id(this->ike_sa));
this->message = response;
*result = response;
return SUCCESS;
}
/**
* Implementation of transaction_t.conclude
*/
static status_t conclude(private_dead_peer_detection_t *this, message_t *response,
transaction_t **transaction)
{
return SUCCESS;
}
/**
* implements transaction_t.destroy
*/
static void destroy(private_dead_peer_detection_t *this)
{
if (this->message)
{
this->message->destroy(this->message);
}
free(this);
}
/*
* Described in header.
*/
dead_peer_detection_t *dead_peer_detection_create(ike_sa_t *ike_sa)
{
private_dead_peer_detection_t *this = malloc_thing(private_dead_peer_detection_t);
/* transaction interface functions */
this->public.transaction.get_request = (status_t(*)(transaction_t*,message_t**))get_request;
this->public.transaction.get_response = (status_t(*)(transaction_t*,message_t*,message_t**,transaction_t**))get_response;
this->public.transaction.conclude = (status_t(*)(transaction_t*,message_t*,transaction_t**))conclude;
this->public.transaction.get_message_id = (u_int32_t(*)(transaction_t*))get_message_id;
this->public.transaction.requested = (u_int32_t(*)(transaction_t*))requested;
this->public.transaction.destroy = (void(*)(transaction_t*))destroy;
/* private data */
this->ike_sa = ike_sa;
this->message_id = 0;
this->message = NULL;
this->requested = 0;
this->logger = logger_manager->get_logger(logger_manager, IKE_SA);
return &this->public;
}
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