/* 
 * $Id: authrad_mod.c,v 1.16.2.4 2005/06/17 11:25:43 janakj Exp $ 
 *
 * Digest Authentication - Radius support
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of ser, a free SIP server.
 *
 * ser 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
 *
 * For a license to use the ser software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact iptel.org by e-mail at the following addresses:
 *    info@iptel.org
 *
 * ser 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
 *
 * History:
 * -------
 *  2003-03-09: Based on auth_mod.c from radius_auth (janakj)
 *  2003-03-11: New module interface (janakj)
 *  2003-03-16: flags export parameter added (janakj)
 *  2003-03-19  all mallocs/frees replaced w/ pkg_malloc/pkg_free (andrei)
 */


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../../sr_module.h"
#include "../../error.h"
#include "../../dprint.h"
#include "../../mem/mem.h"
#include "authrad_mod.h"
#include "authorize.h"

#ifdef RADIUSCLIENT_NG_4
#  include <radiusclient.h>
# else
#  include <radiusclient-ng.h>
#endif

#include "../../modules/acc/dict.h"

MODULE_VERSION

pre_auth_f pre_auth_func = 0;   /* Pre authorization function from auth module */
post_auth_f post_auth_func = 0; /* Post authorization function from auth module */

struct attr attrs[A_MAX];
struct val vals[V_MAX];
void *rh;

static int mod_init(void);                        /* Module initialization function */
static int str_fixup(void** param, int param_no); /* char* -> str* */


/*
 * Module parameter variables
 */
static char* radius_config = (CFG_DIR "radiusclient.conf");
static int service_type = -1;


/*
 * Exported functions
 */
static cmd_export_t cmds[] = {
	{"radius_www_authorize",   radius_www_authorize,   1, str_fixup, REQUEST_ROUTE},
	{"radius_proxy_authorize", radius_proxy_authorize, 1, str_fixup, REQUEST_ROUTE},
	{0, 0, 0, 0, 0}
};


/*
 * Exported parameters
 */
static param_export_t params[] = {
	{"radius_config", STR_PARAM, &radius_config},
	{"service_type",  INT_PARAM, &service_type },
	{0, 0, 0}
};


/*
 * Module interface
 */
struct module_exports exports = {
	"auth_radius", 
	cmds,       /* Exported functions */
	params,     /* Exported parameters */
	mod_init,   /* module initialization function */
	0,          /* response function */
	0,          /* destroy function */
	0,          /* oncancel function */
	0           /* child initialization function */
};


/*
 * Module initialization function
 */
static int mod_init(void)
{
	DICT_VENDOR *vend;

	DBG("auth_radius - Initializing\n");

	memset(attrs, 0, sizeof(attrs));
	memset(attrs, 0, sizeof(vals));
	attrs[A_SERVICE_TYPE].n			= "Service-Type";
	attrs[A_SIP_RPID].n			= "Sip-RPId";
	attrs[A_SIP_URI_USER].n			= "Sip-URI-User";
	attrs[A_DIGEST_RESPONSE].n		= "Digest-Response";
	attrs[A_DIGEST_ALGORITHM].n		= "Digest-Algorithm";
	attrs[A_DIGEST_BODY_DIGEST].n		= "Digest-Body-Digest";
	attrs[A_DIGEST_CNONCE].n		= "Digest-CNonce";
	attrs[A_DIGEST_NONCE_COUNT].n		= "Digest-Nonce-Count";
	attrs[A_DIGEST_QOP].n			= "Digest-QOP";
	attrs[A_DIGEST_METHOD].n		= "Digest-Method";
	attrs[A_DIGEST_URI].n			= "Digest-URI";
	attrs[A_DIGEST_NONCE].n			= "Digest-Nonce";
	attrs[A_DIGEST_REALM].n			= "Digest-Realm";
	attrs[A_DIGEST_USER_NAME].n		= "Digest-User-Name";
	attrs[A_USER_NAME].n			= "User-Name";
	attrs[A_CISCO_AVPAIR].n			= "Cisco-AVPair";
	vals[V_SIP_SESSION].n			= "Sip-Session";

	if ((rh = rc_read_config(radius_config)) == NULL) {
		LOG(L_ERR, "auth_radius: Error opening configuration file \n");
		return -1;
	}

	if (rc_read_dictionary(rh, rc_conf_str(rh, "dictionary")) != 0) {
		LOG(L_ERR, "auth_radius: Error opening dictionary file \n");
		return -2;
	}

	vend = rc_dict_findvend(rh, "Cisco");
	if (vend == NULL) {
		DBG("auth_radius: No `Cisco' vendor in Radius "
			   "dictionary\n");
		attrs[A_CISCO_AVPAIR].n = NULL;
	}

	pre_auth_func = (pre_auth_f)find_export("pre_auth", 0, 0);
	post_auth_func = (post_auth_f)find_export("post_auth", 0, 0);

	if (!(pre_auth_func && post_auth_func)) {
		LOG(L_ERR, "auth_radius: This module requires auth module\n");
		return -4;
	}

	INIT_AV(rh, attrs, vals, "auth_radius", -5, -6);

	if (service_type != -1)
		vals[V_SIP_SESSION].v = service_type;

	return 0;
}


/*
 * Convert char* parameter to str* parameter
 */
static int str_fixup(void** param, int param_no)
{
	str* s;

	if (param_no == 1) {
		s = (str*)pkg_malloc(sizeof(str));
		if (!s) {
			LOG(L_ERR, "auth_radius: str_fixup(): No memory left\n");
			return E_UNSPEC;
		}

		s->s = (char*)*param;
		s->len = strlen(s->s);
		*param = (void*)s;
	}

	return 0;
}