rlm_counter.c

free radius编程。完成AAA的实现

/*
 * 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 <[e-mail]>
 * Copyright 2001-3  Kostas Kalevras <[e-mail]>
 */

#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);