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/*
* Copyright (C) 2012 Andreas Steffen
* HSR 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 "tnc_pdp_connections.h"
#include <utils/linked_list.h>
#include <debug.h>
typedef struct private_tnc_pdp_connections_t private_tnc_pdp_connections_t;
typedef struct entry_t entry_t;
/**
* Private data of tnc_pdp_connections_t
*/
struct private_tnc_pdp_connections_t {
/**
* Implements tnc_pdp_connections_t interface
*/
tnc_pdp_connections_t public;
/**
* List of TNC PEP RADIUS Connections
*/
linked_list_t *list;
};
/**
* Data entry for a TNC PEP RADIUS connection
*/
struct entry_t {
/**
* NAS identifier of PEP
*/
chunk_t nas_id;
/**
* User name of TNC Client
*/
chunk_t user_name;
/**
* EAP method state
*/
eap_method_t *method;
/**
* IKE SA used for bus communication
*/
ike_sa_t *ike_sa;
};
/**
* Free the memory allocated to a data entry
*/
static void free_entry(entry_t *this)
{
this->method->destroy(this->method);
this->ike_sa->destroy(this->ike_sa);
free(this->nas_id.ptr);
free(this->user_name.ptr);
free(this);
}
/**
* Find a matching data entry
*/
static bool equals_entry( entry_t *this, chunk_t nas_id, chunk_t user_name)
{
bool no_nas_id = !this->nas_id.ptr && !nas_id.ptr;
return (chunk_equals(this->nas_id, nas_id) || no_nas_id) &&
chunk_equals(this->user_name, user_name);
}
/**
* Find a matching data entry
*/
static void dbg_nas_user(chunk_t nas_id, chunk_t user_name, bool not, char *op)
{
if (nas_id.len)
{
DBG1(DBG_CFG, "%s RADIUS connection for user '%.*s' NAS '%.*s'",
not ? "could not find" : op, (int)user_name.len,
user_name.ptr, (int)nas_id.len, nas_id.ptr);
}
else
{
DBG1(DBG_CFG, "%s RADIUS connection for user '%.*s'",
not ? "could not find" : op, (int)user_name.len,
user_name.ptr);
}
}
METHOD(tnc_pdp_connections_t, add, void,
private_tnc_pdp_connections_t *this, chunk_t nas_id, chunk_t user_name,
identification_t *peer, eap_method_t *method)
{
enumerator_t *enumerator;
entry_t *entry;
ike_sa_id_t *ike_sa_id;
ike_sa_t *ike_sa;
bool found = FALSE;
ike_sa_id = ike_sa_id_create(IKEV2_MAJOR_VERSION, 0, 0, FALSE);
ike_sa = ike_sa_create(ike_sa_id, FALSE, IKEV2);
ike_sa_id->destroy(ike_sa_id);
ike_sa->set_other_id(ike_sa, peer);
enumerator = this->list->create_enumerator(this->list);
while (enumerator->enumerate(enumerator, &entry))
{
if (equals_entry(entry, nas_id, user_name))
{
found = TRUE;
entry->method->destroy(entry->method);
entry->ike_sa->destroy(entry->ike_sa);
DBG1(DBG_CFG, "removed stale RADIUS connection");
entry->method = method;
entry->ike_sa = ike_sa;
break;
}
}
enumerator->destroy(enumerator);
if (!found)
{
entry = malloc_thing(entry_t);
entry->nas_id = chunk_clone(nas_id);
entry->user_name = chunk_clone(user_name);
entry->method = method;
entry->ike_sa = ike_sa;
this->list->insert_last(this->list, entry);
}
dbg_nas_user(nas_id, user_name, FALSE, "created");
}
METHOD(tnc_pdp_connections_t, remove_, void,
private_tnc_pdp_connections_t *this, chunk_t nas_id, chunk_t user_name)
{
enumerator_t *enumerator;
entry_t *entry;
enumerator = this->list->create_enumerator(this->list);
while (enumerator->enumerate(enumerator, &entry))
{
if (equals_entry(entry, nas_id, user_name))
{
free_entry(entry);
this->list->remove_at(this->list, enumerator);
dbg_nas_user(nas_id, user_name, FALSE, "removed");
break;
}
}
enumerator->destroy(enumerator);
}
METHOD(tnc_pdp_connections_t, get_state, eap_method_t*,
private_tnc_pdp_connections_t *this, chunk_t nas_id, chunk_t user_name,
ike_sa_t **ike_sa)
{
enumerator_t *enumerator;
entry_t *entry;
eap_method_t *found = NULL;
enumerator = this->list->create_enumerator(this->list);
while (enumerator->enumerate(enumerator, &entry))
{
if (equals_entry(entry, nas_id, user_name))
{
found = entry->method;
*ike_sa = entry->ike_sa;
break;
}
}
enumerator->destroy(enumerator);
dbg_nas_user(nas_id, user_name, !found, "found");
return found;
}
METHOD(tnc_pdp_connections_t, destroy, void,
private_tnc_pdp_connections_t *this)
{
this->list->destroy_function(this->list, (void*)free_entry);
free(this);
}
/*
* see header file
*/
tnc_pdp_connections_t *tnc_pdp_connections_create(void)
{
private_tnc_pdp_connections_t *this;
INIT(this,
.public = {
.add = _add,
.remove = _remove_,
.get_state = _get_state,
.destroy = _destroy,
},
.list = linked_list_create(),
);
return &this->public;
}
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