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version 1.2
first MQTT service release!

/*************************************************************************
* (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: accmqtt.c,v 1.4 2012/07/03 12:46:00 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
	by Michael Pounov <misho@elwix.org>.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#include "global.h"


extern const char sql_schema[];


/*
 * mqtt_rtlm_log() Log database connection message
 *
 * @fmt = format string
 * @... = argument list
 * return: none
 */
static void
mqtt_rtlm_log(const char *fmt, ...)
{
	va_list lst;

	va_start(lst, fmt);
	vsyslog(LOG_ERR, fmt, lst);
	va_end(lst);
}
#define MQTT_RTLM_LOG(_sql)	(assert((_sql)), mqtt_rtlm_log("Error:: %s(%d) SQL #%d - %s", \
					__func__, __LINE__, \
					sqlite3_errcode((_sql)), sqlite3_errmsg((_sql))))

/* library pre-loaded actions */
void
_init()
{
	sqlite3_initialize();
}

void
_fini()
{
	sqlite3_shutdown();
}


/*
 * mqtt_rtlm_open() Open database connection
 *
 * @cfg = loaded config
 * return: NULL error or SQL handle
 */
sqlite3 *
mqtt_rtlm_open(cfg_root_t *cfg)
{
	sqlite3 *sql = NULL;
	const char *str = NULL;

	if (!cfg)
		return NULL;

	str = (const char*) cfg_getAttribute(cfg, "mqtt_acc", "name");
	if (!str) {
		mqtt_rtlm_log("Error:: Unknown database name ...\n");
		return NULL;
	}

	if (sqlite3_open_v2(str, &sql, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, NULL)) {
		MQTT_RTLM_LOG(sql);
		sqlite3_close(sql);
		return NULL;
	}

	if (sqlite3_exec(sql, sql_schema, NULL, NULL, NULL)) {
		MQTT_RTLM_LOG(sql);
		sqlite3_close(sql);
		return NULL;
	}

	return sql;
}

/*
 * mqtt_rtlm_close() Close database connection
 *
 * @sql = SQL handle
 * return: none
 */
void
mqtt_rtlm_close(sqlite3 *sql)
{
	sqlite3_close(sql);
}

/*
 * mqtt_rtlm_login() Verify login account
 *
 * @cfg = loaded config
 * @sql = SQL handle
 * @user = username
 * @pass = password
 * return: -1 error, 0 ALLOW and 1 REJECT
 */
int
mqtt_rtlm_login(cfg_root_t *cfg, sqlite3 *sql, const char *user, const char *pass)
{
	/* insert into Users values (NULL, "", "", 1, strftime('%s','now')); */
	int ret = 0;
	sqlite3_stmt *stmt;
	char *str, *psStmt;

	if (!sql)
		return -1;

	str = (char*) cfg_getAttribute(cfg, "mqtt_acc", "tbl_users");
	if (!str) {
		mqtt_rtlm_log("Error:: not found users table name");
		return -1;
	}
	psStmt = sqlite3_mprintf("SELECT DISTINCT Username, Password, Access FROM %s "
			"WHERE Username = '%q' AND Password = '%q' AND Access > 0;", str, user, pass);

	if (sqlite3_prepare_v2(sql, psStmt, strlen(psStmt), &stmt, NULL)) {
		MQTT_RTLM_LOG(sql);
		sqlite3_free(psStmt);
		return -1;
	} else
		sqlite3_free(psStmt);
	while (sqlite3_step(stmt) == SQLITE_ROW) {
		if (sqlite3_data_count(stmt) < 1)
			ret = 0;
		else
			ret = 1;
		break;
	}
	sqlite3_finalize(stmt);

	return ret;
}