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/*
* 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 "radius_config.h"
#include <threading/mutex.h>
#include <threading/condvar.h>
#include <collections/linked_list.h>
typedef struct private_radius_config_t private_radius_config_t;
/**
* Private data of an radius_config_t object.
*/
struct private_radius_config_t {
/**
* Public radius_config_t interface.
*/
radius_config_t public;
/**
* list of radius sockets, as radius_socket_t
*/
linked_list_t *sockets;
/**
* Total number of sockets, in list + currently in use
*/
int socket_count;
/**
* mutex to lock sockets list
*/
mutex_t *mutex;
/**
* condvar to wait for sockets
*/
condvar_t *condvar;
/**
* Server name
*/
char *name;
/**
* NAS-Identifier
*/
chunk_t nas_identifier;
/**
* Preference boost for this server
*/
int preference;
/**
* Is the server currently reachable
*/
bool reachable;
/**
* Retry counter for unreachable servers
*/
int retry;
/**
* reference count
*/
refcount_t ref;
};
METHOD(radius_config_t, get_socket, radius_socket_t*,
private_radius_config_t *this)
{
radius_socket_t *skt;
this->mutex->lock(this->mutex);
while (this->sockets->remove_first(this->sockets, (void**)&skt) != SUCCESS)
{
this->condvar->wait(this->condvar, this->mutex);
}
this->mutex->unlock(this->mutex);
return skt;
}
METHOD(radius_config_t, put_socket, void,
private_radius_config_t *this, radius_socket_t *skt, bool result)
{
this->mutex->lock(this->mutex);
this->sockets->insert_last(this->sockets, skt);
this->mutex->unlock(this->mutex);
this->condvar->signal(this->condvar);
this->reachable = result;
}
METHOD(radius_config_t, get_nas_identifier, chunk_t,
private_radius_config_t *this)
{
return this->nas_identifier;
}
METHOD(radius_config_t, get_preference, int,
private_radius_config_t *this)
{
int pref;
if (this->socket_count == 0)
{ /* don't have sockets, huh? */
return -1;
}
/* calculate preference between 0-100 + boost */
pref = this->preference;
pref += this->sockets->get_count(this->sockets) * 100 / this->socket_count;
if (this->reachable)
{ /* reachable server get a boost: pref = 110-210 + boost */
return pref + 110;
}
/* Not reachable. Increase preference randomly to let it retry from
* time to time, especially if other servers have high load. */
this->retry++;
if (this->retry % 128 == 0)
{ /* every 64th request gets 210, same as unloaded reachable */
return pref + 110;
}
if (this->retry % 32 == 0)
{ /* every 32th request gets 190, wins against average loaded */
return pref + 90;
}
if (this->retry % 8 == 0)
{ /* every 8th request gets 110, same as server under load */
return pref + 10;
}
/* other get ~100, less than fully loaded */
return pref;
}
METHOD(radius_config_t, get_name, char*,
private_radius_config_t *this)
{
return this->name;
}
METHOD(radius_config_t, get_ref, radius_config_t*,
private_radius_config_t *this)
{
ref_get(&this->ref);
return &this->public;
}
METHOD(radius_config_t, destroy, void,
private_radius_config_t *this)
{
if (ref_put(&this->ref))
{
this->mutex->destroy(this->mutex);
this->condvar->destroy(this->condvar);
this->sockets->destroy_offset(this->sockets,
offsetof(radius_socket_t, destroy));
free(this);
}
}
/**
* See header
*/
radius_config_t *radius_config_create(char *name, char *address,
u_int16_t auth_port, u_int16_t acct_port,
char *nas_identifier, char *secret,
int sockets, int preference)
{
private_radius_config_t *this;
radius_socket_t *socket;
INIT(this,
.public = {
.get_socket = _get_socket,
.put_socket = _put_socket,
.get_nas_identifier = _get_nas_identifier,
.get_preference = _get_preference,
.get_name = _get_name,
.get_ref = _get_ref,
.destroy = _destroy,
},
.reachable = TRUE,
.nas_identifier = chunk_create(nas_identifier, strlen(nas_identifier)),
.socket_count = sockets,
.sockets = linked_list_create(),
.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
.condvar = condvar_create(CONDVAR_TYPE_DEFAULT),
.name = name,
.preference = preference,
.ref = 1,
);
while (sockets--)
{
socket = radius_socket_create(address, auth_port, acct_port,
chunk_create(secret, strlen(secret)));
if (!socket)
{
destroy(this);
return NULL;
}
this->sockets->insert_last(this->sockets, socket);
}
return &this->public;
}
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