cel_radius.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <[email protected]>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief RADIUS CEL Support
 * \author Philippe Sultan
 * The Radius Client Library - http://developer.berlios.de/projects/radiusclient-ng/
 *
 * \arg See also \ref AstCEL
 * \ingroup cel_drivers
 */

/*** MODULEINFO
 <depend>radius</depend>
 <support_level>extended</support_level>
 ***/

#include "asterisk.h"

#include RADIUS_HEADER_STR

#include "asterisk/channel.h"
#include "asterisk/cel.h"
#include "asterisk/module.h"
#include "asterisk/logger.h"
#include "asterisk/utils.h"
#include "asterisk/options.h"

/*! ISO 8601 standard format */
#define DATE_FORMAT "%Y-%m-%d %T %z"

#define VENDOR_CODE 22736

enum {
 PW_AST_ACCT_CODE = 101,
 PW_AST_CIDNUM = 102,
 PW_AST_CIDNAME = 103,
 PW_AST_CIDANI = 104,
 PW_AST_CIDRDNIS = 105,
 PW_AST_CIDDNID = 106,
 PW_AST_EXTEN = 107,
 PW_AST_CONTEXT = 108,
 PW_AST_CHANNAME = 109,
 PW_AST_APPNAME = 110,
 PW_AST_APPDATA = 111,
 PW_AST_EVENT_TIME = 112,
 PW_AST_AMA_FLAGS = 113,
 PW_AST_UNIQUE_ID = 114,
 PW_AST_USER_NAME = 115,
 PW_AST_LINKED_ID = 116,
};

enum {
 /*! Log dates and times in UTC */
 RADIUS_FLAG_USEGMTIME = (1 << 0),
 /*! Log Unique ID */
 RADIUS_FLAG_LOGUNIQUEID = (1 << 1),
 /*! Log User Field */
 RADIUS_FLAG_LOGUSERFIELD = (1 << 2)
};

static char *cel_config = "cel.conf";

#ifdef FREERADIUS_CLIENT
static char radiuscfg[PATH_MAX] = "/etc/radiusclient/radiusclient.conf";
#else
static char radiuscfg[PATH_MAX] = "/etc/radiusclient-ng/radiusclient.conf";
#endif

static struct ast_flags global_flags = { RADIUS_FLAG_USEGMTIME | RADIUS_FLAG_LOGUNIQUEID | RADIUS_FLAG_LOGUSERFIELD };

static rc_handle *rh = NULL;

#define RADIUS_BACKEND_NAME "CEL Radius Logging"

#define ADD_VENDOR_CODE(x,y) (rc_avpair_add(rh, send, x, (void *)y, strlen(y), VENDOR_CODE))

static int build_radius_record(VALUE_PAIR **send, struct ast_cel_event_record *record)
{
 int recordtype = PW_STATUS_STOP;
 struct ast_tm tm;
 char timestr[128];
 char *amaflags;

 if (!rc_avpair_add(rh, send, PW_ACCT_STATUS_TYPE, &recordtype, 0, 0)) {
 return -1;
 }
 /* Account code */
 if (!ADD_VENDOR_CODE(PW_AST_ACCT_CODE, record->account_code)) {
 return -1;
 }
 /* Source */
 if (!ADD_VENDOR_CODE(PW_AST_CIDNUM, record->caller_id_num)) {
 return -1;
 }
 /* Destination */
 if (!ADD_VENDOR_CODE(PW_AST_EXTEN, record->extension)) {
 return -1;
 }
 /* Destination context */
 if (!ADD_VENDOR_CODE(PW_AST_CONTEXT, record->context)) {
 return -1;
 }
 /* Caller ID */
 if (!ADD_VENDOR_CODE(PW_AST_CIDNAME, record->caller_id_name)) {
 return -1;
 }
 /* Caller ID ani */
 if (!ADD_VENDOR_CODE(PW_AST_CIDANI, record->caller_id_ani)) {
 return -1;
 }
 /* Caller ID rdnis */
 if (!ADD_VENDOR_CODE(PW_AST_CIDRDNIS, record->caller_id_rdnis)) {
 return -1;
 }
 /* Caller ID dnid */
 if (!ADD_VENDOR_CODE(PW_AST_CIDDNID, record->caller_id_dnid)) {
 return -1;
 }
 /* Channel */
 if (!ADD_VENDOR_CODE(PW_AST_CHANNAME, record->channel_name)) {
 return -1;
 }
 /* Last Application */
 if (!ADD_VENDOR_CODE(PW_AST_APPNAME, record->application_name)) {
 return -1;
 }
 /* Last Data */
 if (!ADD_VENDOR_CODE(PW_AST_APPDATA, record->application_data)) {
 return -1;
 }
 /* Event Time */
 ast_localtime(&record->event_time, &tm,
 ast_test_flag(&global_flags, RADIUS_FLAG_USEGMTIME) ? "GMT" : NULL);
 ast_strftime(timestr, sizeof(timestr), DATE_FORMAT, &tm);
 if (!rc_avpair_add(rh, send, PW_AST_EVENT_TIME, timestr, strlen(timestr), VENDOR_CODE)) {
 return -1;
 }
 /* AMA Flags */
 amaflags = ast_strdupa(ast_channel_amaflags2string(record->amaflag));
 if (!rc_avpair_add(rh, send, PW_AST_AMA_FLAGS, amaflags, strlen(amaflags), VENDOR_CODE)) {
 return -1;
 }
 if (ast_test_flag(&global_flags, RADIUS_FLAG_LOGUNIQUEID)) {
 /* Unique ID */
 if (!ADD_VENDOR_CODE(PW_AST_UNIQUE_ID, record->unique_id)) {
 return -1;
 }
 }
 /* LinkedID */
 if (!ADD_VENDOR_CODE(PW_AST_LINKED_ID, record->linked_id)) {
 return -1;
 }
 /* Setting Acct-Session-Id & User-Name attributes for proper generation
 of Acct-Unique-Session-Id on server side */
 /* Channel */
 if (!rc_avpair_add(rh, send, PW_USER_NAME, (void *)record->channel_name,
 strlen(record->channel_name), 0)) {
 return -1;
 }
 return 0;
}

static void radius_log(struct ast_event *event)
{
 int result = ERROR_RC;
 VALUE_PAIR *send = NULL;
 struct ast_cel_event_record record = {
 .version = AST_CEL_EVENT_RECORD_VERSION,
 };

 if (ast_cel_fill_record(event, &record)) {
 return;
 }

 if (build_radius_record(&send, &record)) {
 ast_debug(1, "Unable to create RADIUS record. CEL not recorded!\n");
 goto return_cleanup;
 }

 result = rc_acct(rh, 0, send);
 if (result != OK_RC) {
 ast_log(LOG_ERROR, "Failed to record Radius CEL record!\n");
 }

return_cleanup:
 if (send) {
 rc_avpair_free(send);
 }
}

static int unload_module(void)
{
 ast_cel_backend_unregister(RADIUS_BACKEND_NAME);
 if (rh) {
 rc_destroy(rh);
 rh = NULL;
 }
 return AST_MODULE_LOAD_SUCCESS;
}

static int load_module(void)
{
 struct ast_config *cfg;
 struct ast_flags config_flags = { 0 };
 const char *tmp;

 if ((cfg = ast_config_load(cel_config, config_flags))) {
 ast_set2_flag(&global_flags, ast_true(ast_variable_retrieve(cfg, "radius", "usegmtime")), RADIUS_FLAG_USEGMTIME);
 if ((tmp = ast_variable_retrieve(cfg, "radius", "radiuscfg"))) {
 ast_copy_string(radiuscfg, tmp, sizeof(radiuscfg));
 }
 ast_config_destroy(cfg);
 } else {
 return AST_MODULE_LOAD_DECLINE;
 }

 /* read radiusclient-ng config file */
 if (!(rh = rc_read_config(radiuscfg))) {
 ast_log(LOG_NOTICE, "Cannot load radiusclient-ng configuration file %s.\n", radiuscfg);
 return AST_MODULE_LOAD_DECLINE;
 }

 /* read radiusclient-ng dictionaries */
 if (rc_read_dictionary(rh, rc_conf_str(rh, "dictionary"))) {
 ast_log(LOG_NOTICE, "Cannot load radiusclient-ng dictionary file.\n");
 rc_destroy(rh);
 rh = NULL;
 return AST_MODULE_LOAD_DECLINE;
 }

 if (ast_cel_backend_register(RADIUS_BACKEND_NAME, radius_log)) {
 rc_destroy(rh);
 rh = NULL;
 return AST_MODULE_LOAD_DECLINE;
 } else {
 return AST_MODULE_LOAD_SUCCESS;
 }
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "RADIUS CEL Backend",
 .support_level = AST_MODULE_SUPPORT_EXTENDED,
 .load = load_module,
 .unload = unload_module,
 .load_pri = AST_MODPRI_CDR_DRIVER,
 .requires = "cel",
);