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/*
* Copyright (C) 2007 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 "ike_auth_lifetime.h"
#include <time.h>
#include <daemon.h>
#include <encoding/payloads/notify_payload.h>
typedef struct private_ike_auth_lifetime_t private_ike_auth_lifetime_t;
/**
* Private members of a ike_auth_lifetime_t task.
*/
struct private_ike_auth_lifetime_t {
/**
* Public methods and task_t interface.
*/
ike_auth_lifetime_t public;
/**
* Assigned IKE_SA.
*/
ike_sa_t *ike_sa;
};
/**
* add the AUTH_LIFETIME notify to the message
*/
static void add_auth_lifetime(private_ike_auth_lifetime_t *this, message_t *message)
{
chunk_t chunk;
u_int32_t lifetime;
lifetime = this->ike_sa->get_statistic(this->ike_sa, STAT_REAUTH);
if (lifetime)
{
lifetime -= time(NULL);
chunk = chunk_from_thing(lifetime);
*(u_int32_t*)chunk.ptr = htonl(lifetime);
message->add_notify(message, FALSE, AUTH_LIFETIME, chunk);
}
}
/**
* read notifys from message and evaluate them
*/
static void process_payloads(private_ike_auth_lifetime_t *this, message_t *message)
{
enumerator_t *enumerator;
payload_t *payload;
notify_payload_t *notify;
enumerator = message->create_payload_enumerator(message);
while (enumerator->enumerate(enumerator, &payload))
{
if (payload->get_type(payload) == NOTIFY)
{
notify = (notify_payload_t*)payload;
switch (notify->get_notify_type(notify))
{
case AUTH_LIFETIME:
{
chunk_t data = notify->get_notification_data(notify);
u_int32_t lifetime = ntohl(*(u_int32_t*)data.ptr);
this->ike_sa->set_auth_lifetime(this->ike_sa, lifetime);
break;
}
default:
break;
}
}
}
enumerator->destroy(enumerator);
}
/**
* Implementation of task_t.process for initiator
*/
static status_t build_i(private_ike_auth_lifetime_t *this, message_t *message)
{
if (message->get_exchange_type(message) == INFORMATIONAL)
{
add_auth_lifetime(this, message);
return SUCCESS;
}
return NEED_MORE;
}
/**
* Implementation of task_t.process for responder
*/
static status_t process_r(private_ike_auth_lifetime_t *this, message_t *message)
{
if (message->get_exchange_type(message) == INFORMATIONAL)
{
process_payloads(this, message);
return SUCCESS;
}
return NEED_MORE;
}
/**
* Implementation of task_t.build for responder
*/
static status_t build_r(private_ike_auth_lifetime_t *this, message_t *message)
{
if (message->get_exchange_type(message) == IKE_AUTH &&
this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
{
add_auth_lifetime(this, message);
return SUCCESS;
}
return NEED_MORE;
}
/**
* Implementation of task_t.process for initiator
*/
static status_t process_i(private_ike_auth_lifetime_t *this, message_t *message)
{
if (message->get_exchange_type(message) == IKE_AUTH &&
this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
{
process_payloads(this, message);
return SUCCESS;
}
return NEED_MORE;
}
/**
* Implementation of task_t.get_type
*/
static task_type_t get_type(private_ike_auth_lifetime_t *this)
{
return IKE_AUTH_LIFETIME;
}
/**
* Implementation of task_t.migrate
*/
static void migrate(private_ike_auth_lifetime_t *this, ike_sa_t *ike_sa)
{
this->ike_sa = ike_sa;
}
/**
* Implementation of task_t.destroy
*/
static void destroy(private_ike_auth_lifetime_t *this)
{
free(this);
}
/*
* Described in header.
*/
ike_auth_lifetime_t *ike_auth_lifetime_create(ike_sa_t *ike_sa, bool initiator)
{
private_ike_auth_lifetime_t *this = malloc_thing(private_ike_auth_lifetime_t);
this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
this->public.task.destroy = (void(*)(task_t*))destroy;
if (initiator)
{
this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
}
else
{
this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
}
this->ike_sa = ike_sa;
return &this->public;
}
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