/*
* rlm_counter.c
*
* Version: $Id: rlm_counter.c,v 1.43 2004/02/26 19:04:28 aland Exp $
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Copyright 2001 The FreeRADIUS server project
* Copyright 2001 Alan DeKok <aland@ox.org>
* Copyright 2001-3 Kostas Kalevras <kkalev@noc.ntua.gr>
*/
#include "config.h"
#include "autoconf.h"
#include "libradius.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "radiusd.h"
#include "modules.h"
#include "conffile.h"
#include <gdbm.h>
#include <time.h>
#ifdef NEEDS_GDBM_SYNC
# define GDBM_SYNCOPT GDBM_SYNC
#else
# define GDBM_SYNCOPT 0
#endif
#ifdef GDBM_NOLOCK
#define GDBM_COUNTER_OPTS (GDBM_SYNCOPT | GDBM_NOLOCK)
#else
#define GDBM_COUNTER_OPTS (GDBM_SYNCOPT)
#endif
#ifndef HAVE_GDBM_FDESC
#define gdbm_fdesc(foo) (-1)
#endif
#define UNIQUEID_MAX_LEN 32
static const char rcsid[] = "$Id: rlm_counter.c,v 1.43 2004/02/26 19:04:28 aland Exp $";
/*
* Define a structure for our module configuration.
*
* These variables do not need to be in a structure, but it's
* a lot cleaner to do so, and a pointer to the structure can
* be used as the instance handle.
*/
typedef struct rlm_counter_t {
char *filename; /* name of the database file */
char *reset; /* daily, weekly, monthly, never or user defined */
char *key_name; /* User-Name */
char *count_attribute; /* Acct-Session-Time */
char *counter_name; /* Daily-Session-Time */
char *check_name; /* Daily-Max-Session */
char *service_type; /* Service-Type to search for */
int cache_size;
int service_val;
int key_attr;
int count_attr;
int check_attr;
time_t reset_time; /* The time of the next reset. */
time_t last_reset; /* The time of the last reset. */
int dict_attr; /* attribute number for the counter. */
GDBM_FILE gdbm; /* The gdbm file handle */
#ifdef HAVE_PTHREAD_H
pthread_mutex_t mutex; /* A mutex to lock the gdbm file for only one reader/writer */
#endif
} rlm_counter_t;
#ifndef HAVE_PTHREAD_H
/*
* This is a lot simpler than putting ifdef's around
* every use of the pthread functions.
*/
#define pthread_mutex_lock(a)
#define pthread_mutex_unlock(a)
#define pthread_mutex_init(a,b)
#define pthread_mutex_destroy(a)
#endif
typedef struct rad_counter {
unsigned int user_counter;
char uniqueid[UNIQUEID_MAX_LEN];
} rad_counter;
/*
* A mapping of configuration file names to internal variables.
*
* Note that the string is dynamically allocated, so it MUST
* be freed. When the configuration file parse re-reads the string,
* it free's the old one, and strdup's the new one, placing the pointer
* to the strdup'd string into 'config.string'. This gets around
* buffer over-flows.
*/
static CONF_PARSER module_config[] = {
{ "filename", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,filename), NULL, NULL },
{ "key", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,key_name), NULL, NULL },
{ "reset", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,reset), NULL, NULL },
{ "count-attribute", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,count_attribute), NULL, NULL },
{ "counter-name", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,counter_name), NULL, NULL },
{ "check-name", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,check_name), NULL, NULL },
{ "allowed-servicetype", PW_TYPE_STRING_PTR, offsetof(rlm_counter_t,service_type),NULL, NULL },
{ "cache-size", PW_TYPE_INTEGER, offsetof(rlm_counter_t,cache_size), NULL, "1000" },
{ NULL, -1, 0, NULL, NULL }
};
static int counter_detach(void *instance);
/*
* See if the counter matches.
*/
static int counter_cmp(void *instance,
REQUEST *req UNUSED,
VALUE_PAIR *request, VALUE_PAIR *check,
VALUE_PAIR *check_pairs, VALUE_PAIR **reply_pairs)
{
rlm_counter_t *data = (rlm_counter_t *) instance;
datum key_datum;
datum count_datum;
VALUE_PAIR *key_vp;
rad_counter counter;
check_pairs = check_pairs; /* shut the compiler up */
reply_pairs = reply_pairs;
req = req;
/*
* Find the key attribute.
*/
key_vp = pairfind(request, data->key_attr);
if (key_vp == NULL) {
return RLM_MODULE_NOOP;
}
key_datum.dptr = key_vp->strvalue;
key_datum.dsize = key_vp->length;
count_datum = gdbm_fetch(data->gdbm, key_datum);
if (count_datum.dptr == NULL) {
return -1;
}
memcpy(&counter, count_datum.dptr, sizeof(rad_counter));
free(count_datum.dptr);
return counter.user_counter - check->lvalue;
}
static int add_defaults(rlm_counter_t *data)
{
datum key_datum;
datum time_datum;
const char *default1 = "DEFAULT1";
const char *default2 = "DEFAULT2";
DEBUG2("rlm_counter: add_defaults: Start");
key_datum.dptr = (char *) default1;
key_datum.dsize = strlen(default1);
time_datum.dptr = (char *) &data->reset_time;
time_datum.dsize = sizeof(time_t);
if (gdbm_store(data->gdbm, key_datum, time_datum, GDBM_REPLACE) < 0){
radlog(L_ERR, "rlm_counter: Failed storing data to %s: %s",
data->filename, gdbm_strerror(gdbm_errno));
return RLM_MODULE_FAIL;
}
DEBUG2("rlm_counter: DEFAULT1 set to %d",(int)data->reset_time);
key_datum.dptr = (char *) default2;
key_datum.dsize = strlen(default2);
time_datum.dptr = (char *) &data->last_reset;
time_datum.dsize = sizeof(time_t);
if (gdbm_store(data->gdbm, key_datum, time_datum, GDBM_REPLACE) < 0){
radlog(L_ERR, "rlm_counter: Failed storing data to %s: %s",
data->filename, gdbm_strerror(gdbm_errno));
return RLM_MODULE_FAIL;
}
DEBUG2("rlm_counter: DEFAULT2 set to %d",(int)data->last_reset);
DEBUG2("rlm_counter: add_defaults: End");
return RLM_MODULE_OK;
}
static int reset_db(rlm_counter_t *data)
{
int cache_size = data->cache_size;
int ret;
DEBUG2("rlm_counter: reset_db: Closing database");
gdbm_close(data->gdbm);
/*
* Open a completely new database.
*/
data->gdbm = gdbm_open(data->filename, sizeof(int),
GDBM_NEWDB | GDBM_COUNTER_OPTS, 0600, NULL);
if (data->gdbm == NULL) {
radlog(L_ERR, "rlm_counter: Failed to open file %s: %s",
data->filename, strerror(errno));
return RLM_MODULE_FAIL;
}
if (gdbm_setopt(data->gdbm, GDBM_CACHESIZE, &cache_size, sizeof(int)) == -1)
radlog(L_ERR, "rlm_counter: Failed to set cache size");
DEBUG2("rlm_counter: reset_db: Opened new database");
/*
* Add defaults
*/
ret = add_defaults(data);
if (ret != RLM_MODULE_OK)
return ret;
DEBUG2("rlm_counter: reset_db ended");
return RLM_MODULE_OK;
}
static int find_next_reset(rlm_counter_t *data, time_t timeval)
{
int ret=0;
unsigned int num=1;
char last = 0;
struct tm *tm, s_tm;
char sCurrentTime[40], sNextTime[40];
tm = localtime_r(&timeval, &s_tm);
strftime(sCurrentTime, sizeof(sCurrentTime),"%Y-%m-%d %H:%M:%S",tm);
tm->tm_sec = tm->tm_min = 0;
if (data->reset == NULL)
return -1;
if (isdigit((int) data->reset[0])){
unsigned int len=0;
len = strlen(data->reset);
if (len == 0)
return -1;
last = data->reset[len - 1];
if (!isalpha((int) last))
last = 'd';
num = atoi(data->reset);
DEBUG("rlm_counter: num=%d, last=%c",num,last);
}
if (strcmp(data->reset, "hourly") == 0 || last == 'h') {
/*
* Round up to the next nearest hour.
*/
tm->tm_hour += num;
data->reset_time = mktime(tm);
} else if (strcmp(data->reset, "daily") == 0 || last == 'd') {
/*
* Round up to the next nearest day.
*/
tm->tm_hour = 0;
tm->tm_mday += num;
data->reset_time = mktime(tm);
} else if (strcmp(data->reset, "weekly") == 0 || last == 'w') {
/*
* Round up to the next nearest week.
*/
tm->tm_hour = 0;
tm->tm_mday += (7 - tm->tm_wday) +(7*(num-1));
data->reset_time = mktime(tm);
} else if (strcmp(data->reset, "monthly") == 0 || last == 'm') {
tm->tm_hour = 0;
tm->tm_mday = 1;
tm->tm_mon += num;
data->reset_time = mktime(tm);
} else if (strcmp(data->reset, "never") == 0) {
data->reset_time = 0;
} else {
radlog(L_ERR, "rlm_counter: Unknown reset timer \"%s\"",
data->reset);
return -1;
}
strftime(sNextTime, sizeof(sNextTime),"%Y-%m-%d %H:%M:%S",tm);
DEBUG2("rlm_counter: Current Time: %d [%s], Next reset %d [%s]",
(int)timeval,sCurrentTime,(int)data->reset_time,sNextTime);
return ret;
}
/*
* Do any per-module initialization that is separate to each
* configured instance of the module. e.g. set up connections
* to external databases, read configuration files, set up
* dictionary entries, etc.
*
* If configuration information is given in the config section
* that must be referenced in later calls, store a handle to it
* in *instance otherwise put a null pointer there.
*/
static int counter_instantiate(CONF_SECTION *conf, void **instance)
{
rlm_counter_t *data;
DICT_ATTR *dattr;
DICT_VALUE *dval;
ATTR_FLAGS flags;
time_t now;
int cache_size;
int ret;
datum key_datum;
datum time_datum;
const char *default1 = "DEFAULT1";
const char *default2 = "DEFAULT2";
/*
* Set up a storage area for instance data
*/
data = rad_malloc(sizeof(*data));
if (!data) {
radlog(L_ERR, "rlm_counter: rad_malloc() failed.");
return -1;
}
memset(data, 0, sizeof(*data));
/*
* If the configuration parameters can't be parsed, then
* fail.
*/
if (cf_section_parse(conf, data, module_config) < 0) {
free(data);
return -1;
}
cache_size = data->cache_size;
/*
* Discover the attribute number of the key.
*/
if (data->key_name == NULL) {
radlog(L_ERR, "rlm_counter: 'key' must be set.");
counter_detach(data);
return -1;
}
dattr = dict_attrbyname(data->key_name);
if (dattr == NULL) {
radlog(L_ERR, "rlm_counter: No such attribute %s",
data->key_name);
counter_detach(data);
return -1;
}
data->key_attr = dattr->attr;
/*
* Discover the attribute number of the counter.
*/
if (data->count_attribute == NULL) {
radlog(L_ERR, "rlm_counter: 'count-attribute' must be set.");
counter_detach(data);
return -1;
}
dattr = dict_attrbyname(data->count_attribute);
if (dattr == NULL) {
radlog(L_ERR, "rlm_counter: No such attribute %s",
data->count_attribute);
counter_detach(data);
return -1;
}
data->count_attr = dattr->attr;
/*
* Create a new attribute for the counter.
*/
if (data->counter_name == NULL) {
radlog(L_ERR, "rlm_counter: 'counter-name' must be set.");
counter_detach(data);
return -1;
}
memset(&flags, 0, sizeof(flags));
dict_addattr(data->counter_name, 0, PW_TYPE_INTEGER, -1, flags);
dattr = dict_attrbyname(data->counter_name);
if (dattr == NULL) {
radlog(L_ERR, "rlm_counter: Failed to create counter attribute %s",
data->counter_name);
counter_detach(data);
return -1;
}
data->dict_attr = dattr->attr;
DEBUG2("rlm_counter: Counter attribute %s is number %d",
data->counter_name, data->dict_attr);
/*
* Create a new attribute for the check item.
*/
if (data->check_name == NULL) {
radlog(L_ERR, "rlm_counter: 'check-name' must be set.");
counter_detach(data);
return -1;
}
dict_addattr(data->check_name, 0, PW_TYPE_INTEGER, -1, flags);
dattr = dict_attrbyname(data->check_name);
if (dattr == NULL) {
radlog(L_ERR, "rlm_counter: Failed to create check attribute %s",
data->counter_name);
counter_detach(data);
return -1;
}
data->check_attr = dattr->attr;
/*
* Find the attribute for the allowed protocol
*/
if (data->service_type != NULL) {
if ((dval = dict_valbyname(PW_SERVICE_TYPE, data->service_type)) == NULL) {
radlog(L_ERR, "rlm_counter: Failed to find attribute number for %s",
data->service_type);
counter_detach(data);
return -1;
}
data->service_val = dval->value;
}
/*
* Find when to reset the database.
*/
if (data->reset == NULL) {
radlog(L_ERR, "rlm_counter: 'reset' must be set.");
counter_detach(data);
return -1;
}
now = time(NULL);
data->reset_time = 0;
data->last_reset = now;
if (find_next_reset(data,now) == -1){
radlog(L_ERR, "rlm_counter: find_next_reset() returned -1. Exiting.");
counter_detach(data);
return -1;
}
if (data->filename == NULL) {
radlog(L_ERR, "rlm_counter: 'filename' must be set.");
counter_detach(data);
return -1;
}
data->gdbm = gdbm_open(data->filename, sizeof(int),
GDBM_WRCREAT | GDBM_COUNTER_OPTS, 0600, NULL);
if (data->gdbm == NULL) {
radlog(L_ERR, "rlm_counter: Failed to open file %s: %s",
data->filename, strerror(errno));
counter_detach(data);
return -1;
}
if (gdbm_setopt(data->gdbm, GDBM_CACHESIZE, &cache_size, sizeof(int)) == -1)
radlog(L_ERR, "rlm_counter: Failed to set cache size");
/*
* Look for the DEFAULT1 entry. This entry if it exists contains the
* time of the next database reset. This time is set each time we reset
* the database. If next_reset < now then we reset the database.
* That way we can overcome the problem where radiusd is down during a database
* reset time. If we did not keep state information in the database then the reset
* would be extended and that would create problems.
*
* We also store the time of the last reset in the DEFAULT2 entry.
*
* If DEFAULT1 and DEFAULT2 do not exist (new database) we add them to the database
*/
key_datum.dptr = (char *)default1;
key_datum.dsize = strlen(default1);
time_datum = gdbm_fetch(data->gdbm, key_datum);
if (time_datum.dptr != NULL){
time_t next_reset = 0;
memcpy(&next_reset, time_datum.dptr, sizeof(time_t));
free(time_datum.dptr);
if (next_reset && next_reset <= now){
data->last_reset = now;
ret = reset_db(data);
if (ret != RLM_MODULE_OK){
radlog(L_ERR, "rlm_counter: reset_db() failed");
counter_detach(data);
return -1;
}
}
else
data->reset_time = next_reset;
key_datum.dptr = (char *)default2;
key_datum.dsize = strlen(default2);
time_datum = gdbm_fetch(data->gdbm, key_datum);
if (time_datum.dptr != NULL){
memcpy(&data->last_reset, time_datum.dptr, sizeof(time_t));
free(time_datum.dptr);
}
}
else{
ret = add_defaults(data);
if (ret != RLM_MODULE_OK){
radlog(L_ERR, "rlm_counter: add_defaults() failed");
counter_detach(data);
return -1;
}
}
/*
* Register the counter comparison operation.
*/
paircompare_register(data->dict_attr, 0, counter_cmp, data);
/*
* Init the mutex
*/
pthread_mutex_init(&data->mutex, NULL);
*instance = data;
return 0;
}
/*
* Write accounting information to this modules database.
*/
static int counter_accounting(void *instance, REQUEST *request)
{
rlm_counter_t *data = (rlm_counter_t *)instance;
datum key_datum;
datum count_datum;
VALUE_PAIR *key_vp, *count_vp, *proto_vp, *uniqueid_vp;
rad_counter counter;
int rcode;
int acctstatustype = 0;
time_t diff;
if ((key_vp = pairfind(request->packet->vps, PW_ACCT_STATUS_TYPE)) != NULL)
acctstatustype = key_vp->lvalue;
else {
DEBUG("rlm_counter: Could not find account status type in packet.");
return RLM_MODULE_NOOP;
}
if (acctstatustype != PW_STATUS_STOP){
DEBUG("rlm_counter: We only run on Accounting-Stop packets.");
return RLM_MODULE_NOOP;
}
uniqueid_vp = pairfind(request->packet->vps, PW_ACCT_UNIQUE_SESSION_ID);
if (uniqueid_vp != NULL)
DEBUG("rlm_counter: Packet Unique ID = '%s'",uniqueid_vp->strvalue);
/*
* Before doing anything else, see if we have to reset
* the counters.
*/
if (data->reset_time && (data->reset_time <= request->timestamp)) {
int ret;
DEBUG("rlm_counter: Time to reset the database.");
data->last_reset = data->reset_time;
find_next_reset(data,request->timestamp);
pthread_mutex_lock(&data->mutex);
ret = reset_db(data);
pthread_mutex_unlock(&data->mutex);
if (ret != RLM_MODULE_OK)
return ret;
}
/*
* Check if we need to watch out for a specific service-type. If yes then check it
*/
if (data->service_type != NULL) {
if ((proto_vp = pairfind(request->packet->vps, PW_SERVICE_TYPE)) == NULL){
DEBUG("rlm_counter: Could not find Service-Type attribute in the request. Returning NOOP.");
return RLM_MODULE_NOOP;
}
if ((unsigned)proto_vp->lvalue != data->service_val){
DEBUG("rlm_counter: This Service-Type is not allowed. Returning NOOP.");
return RLM_MODULE_NOOP;
}
}
/*
* Check if request->timestamp - {Acct-Delay-Time} < last_reset
* If yes reject the packet since it is very old
*/
key_vp = pairfind(request->packet->vps, PW_ACCT_DELAY_TIME);
if (key_vp != NULL){
if (key_vp->lvalue != 0 &&
(request->timestamp - key_vp->lvalue) < data->last_reset){
DEBUG("rlm_counter: This packet is too old. Returning NOOP.");
return RLM_MODULE_NOOP;
}
}
/*
* Look for the key. User-Name is special. It means
* The REAL username, after stripping.
*/
key_vp = (data->key_attr == PW_USER_NAME) ? request->username : pairfind(request->packet->vps, data->key_attr);
if (key_vp == NULL){
DEBUG("rlm_counter: Could not find the key-attribute in the request. Returning NOOP.");
return RLM_MODULE_NOOP;
}
/*
* Look for the attribute to use as a counter.
*/
count_vp = pairfind(request->packet->vps, data->count_attr);
if (count_vp == NULL){
DEBUG("rlm_counter: Could not find the count-attribute in the request.");
return RLM_MODULE_NOOP;
}
key_datum.dptr = key_vp->strvalue;
key_datum.dsize = key_vp->length;
DEBUG("rlm_counter: Searching the database for key '%s'",key_vp->strvalue);
pthread_mutex_lock(&data->mutex);
count_datum = gdbm_fetch(data->gdbm, key_datum);
pthread_mutex_unlock(&data->mutex);
if (count_datum.dptr == NULL){
DEBUG("rlm_counter: Could not find the requested key in the database.");
counter.user_counter = 0;
if (uniqueid_vp != NULL)
strncpy(counter.uniqueid,uniqueid_vp->strvalue,UNIQUEID_MAX_LEN - 1);
else
memset((char *)counter.uniqueid,0,UNIQUEID_MAX_LEN);
}
else{
DEBUG("rlm_counter: Key found.");
memcpy(&counter, count_datum.dptr, sizeof(rad_counter));
free(count_datum.dptr);
if (counter.uniqueid)
DEBUG("rlm_counter: Counter Unique ID = '%s'",counter.uniqueid);
if (uniqueid_vp != NULL){
if (counter.uniqueid != NULL &&
strncmp(uniqueid_vp->strvalue,counter.uniqueid, UNIQUEID_MAX_LEN - 1) == 0){
DEBUG("rlm_counter: Unique IDs for user match. Droping the request.");
return RLM_MODULE_NOOP;
}
strncpy(counter.uniqueid,uniqueid_vp->strvalue,UNIQUEID_MAX_LEN - 1);
}
DEBUG("rlm_counter: User=%s, Counter=%d.",request->username->strvalue,counter.user_counter);
}
if (data->count_attr == PW_ACCT_SESSION_TIME) {
/*
* If session time < diff then the user got in after the
* last reset. So add his session time, otherwise add the
* diff.
*
* That way if he logged in at 23:00 and we reset the
* daily counter at 24:00 and he logged out at 01:00
* then we will only count one hour (the one in the new
* day). That is the right thing
*/
diff = request->timestamp - data->last_reset;
counter.user_counter += (count_vp->lvalue < diff) ? count_vp->lvalue : diff;
} else if (count_vp->type == PW_TYPE_INTEGER) {
/*
* Integers get counted, without worrying about
* reset dates.
*/
counter.user_counter += count_vp->lvalue;
} else {
/*
* The attribute is NOT an integer, just count once
* more that we've seen it.
*/
counter.user_counter++;
}
DEBUG("rlm_counter: User=%s, New Counter=%d.",request->username->strvalue,counter.user_counter);
count_datum.dptr = (char *) &counter;
count_datum.dsize = sizeof(rad_counter);
DEBUG("rlm_counter: Storing new value in database.");
pthread_mutex_lock(&data->mutex);
rcode = gdbm_store(data->gdbm, key_datum, count_datum, GDBM_REPLACE);
pthread_mutex_unlock(&data->mutex);
if (rcode < 0) {
radlog(L_ERR, "rlm_counter: Failed storing data to %s: %s",
data->filename, gdbm_strerror(gdbm_errno));
return RLM_MODULE_FAIL;
}
DEBUG("rlm_counter: New value stored successfully.");
return RLM_MODULE_OK;
}
/*
* Find the named user in this modules database. Create the set
* of attribute-value pairs to check and reply with for this user
* from the database. The authentication code only needs to check
* the password, the rest is done here.
*/
static int counter_authorize(void *instance, REQUEST *request)
{
rlm_counter_t *data = (rlm_counter_t *) instance;
int ret=RLM_MODULE_NOOP;
datum key_datum;
datum count_datum;
rad_counter counter;
int res=0;
VALUE_PAIR *key_vp, *check_vp;
VALUE_PAIR *reply_item;
char msg[128];
/* quiet the compiler */
instance = instance;
request = request;
/*
* Before doing anything else, see if we have to reset
* the counters.
*/
if (data->reset_time && (data->reset_time <= request->timestamp)) {
int ret2;
data->last_reset = data->reset_time;
find_next_reset(data,request->timestamp);
pthread_mutex_lock(&data->mutex);
ret2 = reset_db(data);
pthread_mutex_unlock(&data->mutex);
if (ret2 != RLM_MODULE_OK)
return ret2;
}
/*
* Look for the key. User-Name is special. It means
* The REAL username, after stripping.
*/
DEBUG2("rlm_counter: Entering module authorize code");
key_vp = (data->key_attr == PW_USER_NAME) ? request->username : pairfind(request->packet->vps, data->key_attr);
if (key_vp == NULL) {
DEBUG2("rlm_counter: Could not find Key value pair");
return ret;
}
/*
* Look for the check item
*/
if ((check_vp= pairfind(request->config_items, data->check_attr)) == NULL) {
DEBUG2("rlm_counter: Could not find Check item value pair");
return ret;
}
key_datum.dptr = key_vp->strvalue;
key_datum.dsize = key_vp->length;
/*
* Init to be sure
*/
counter.user_counter = 0;
DEBUG("rlm_counter: Searching the database for key '%s'",key_vp->strvalue);
pthread_mutex_lock(&data->mutex);
count_datum = gdbm_fetch(data->gdbm, key_datum);
pthread_mutex_unlock(&data->mutex);
if (count_datum.dptr != NULL){
DEBUG("rlm_counter: Key Found.");
memcpy(&counter, count_datum.dptr, sizeof(rad_counter));
free(count_datum.dptr);
}
else
DEBUG("rlm_counter: Could not find the requested key in the database.");
/*
* Check if check item > counter
*/
DEBUG("rlm_counter: Check item = %d, Count = %d",check_vp->lvalue,counter.user_counter);
res=check_vp->lvalue - counter.user_counter;
if (res > 0) {
DEBUG("rlm_counter: res is greater than zero");
if (data->count_attr == PW_ACCT_SESSION_TIME) {
/*
* Do the following only if the count attribute is
* AcctSessionTime
*/
/*
* We are assuming that simultaneous-use=1. But
* even if that does not happen then our user
* could login at max for 2*max-usage-time Is
* that acceptable?
*/
/*
* User is allowed, but set Session-Timeout.
* Stolen from main/auth.c
*/
/*
* If we are near a reset then add the next
* limit, so that the user will not need to
* login again
*/
if (data->reset_time && (
res >= (data->reset_time - request->timestamp))) {
res += check_vp->lvalue;
}
if ((reply_item = pairfind(request->reply->vps, PW_SESSION_TIMEOUT)) != NULL) {
if (reply_item->lvalue > res)
reply_item->lvalue = res;
} else {
if ((reply_item = paircreate(PW_SESSION_TIMEOUT, PW_TYPE_INTEGER)) == NULL) {
radlog(L_ERR|L_CONS, "no memory");
return RLM_MODULE_NOOP;
}
reply_item->lvalue = res;
pairadd(&request->reply->vps, reply_item);
}
}
ret=RLM_MODULE_OK;
DEBUG2("rlm_counter: (Check item - counter) is greater than zero");
DEBUG2("rlm_counter: Authorized user %s, check_item=%d, counter=%d",
key_vp->strvalue,check_vp->lvalue,counter.user_counter);
DEBUG2("rlm_counter: Sent Reply-Item for user %s, Type=Session-Timeout, value=%d",
key_vp->strvalue,res);
}
else{
char module_fmsg[MAX_STRING_LEN];
VALUE_PAIR *module_fmsg_vp;
/*
* User is denied access, send back a reply message
*/
sprintf(msg, "Your maximum %s usage time has been reached", data->reset);
reply_item=pairmake("Reply-Message", msg, T_OP_EQ);
pairadd(&request->reply->vps, reply_item);
snprintf(module_fmsg,sizeof(module_fmsg), "rlm_counter: Maximum %s usage time reached", data->reset);
module_fmsg_vp = pairmake("Module-Failure-Message", module_fmsg, T_OP_EQ);
pairadd(&request->packet->vps, module_fmsg_vp);
ret=RLM_MODULE_REJECT;
DEBUG2("rlm_counter: Rejected user %s, check_item=%d, counter=%d",
key_vp->strvalue,check_vp->lvalue,counter.user_counter);
}
return ret;
}
static int counter_detach(void *instance)
{
rlm_counter_t *data = (rlm_counter_t *) instance;
paircompare_unregister(data->dict_attr, counter_cmp);
if (data->gdbm)
gdbm_close(data->gdbm);
free(data->filename);
free(data->reset);
free(data->key_name);
free(data->count_attribute);
free(data->counter_name);
free(data->check_name);
free(data->service_type);
pthread_mutex_destroy(&data->mutex);
free(instance);
return 0;
}
/*
* The module name should be the only globally exported symbol.
* That is, everything else should be 'static'.
*
* If the module needs to temporarily modify it's instantiation
* data, the type should be changed to RLM_TYPE_THREAD_UNSAFE.
* The server will then take care of ensuring that the module
* is single-threaded.
*/
module_t rlm_counter = {
"Counter",
RLM_TYPE_THREAD_SAFE, /* type */
NULL, /* initialization */
counter_instantiate, /* instantiation */
{
NULL, /* authentication */
counter_authorize, /* authorization */
NULL, /* preaccounting */
counter_accounting, /* accounting */
NULL, /* checksimul */
NULL, /* pre-proxy */
NULL, /* post-proxy */
NULL /* post-auth */
},
counter_detach, /* detach */
NULL, /* destroy */
};
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