#!/usr/local/bin/php-cgi -q
<?php
/*
 * captiveportal_gather_stats.php
 *
 * part of pfSense (https://www.pfsense.org)
 * Copyright (c) 2011 Warren Baker
 * Copyright (c) 2013-2016 Electric Sheep Fencing, LLC
 * 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 acknowledgment:
 *    "This product includes software developed by the pfSense Project
 *    for use in the pfSense® software distribution. (http://www.pfsense.org/).
 *
 * 4. The names "pfSense" and "pfSense Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    coreteam@pfsense.org.
 *
 * 5. Products derived from this software may not be called "pfSense"
 *    nor may "pfSense" appear in their names without prior written
 *    permission of the Electric Sheep Fencing, LLC.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *
 * "This product includes software developed by the pfSense Project
 * for use in the pfSense software distribution (http://www.pfsense.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY THE pfSense PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 pfSense PROJECT OR
 * ITS 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.
 */

require_once("functions.inc");
require_once("captiveportal.inc");
require_once("util.inc");

global $cpzone;

$cpzone = $argv[1];
$type = $argv[2];

/* read in captive portal db */
$cpdb = captiveportal_read_db();

/* determine number of logged in users */
$no_users = count($cpdb);
$concurrent_users = $no_users;

/* set initial user count to zero */
$current_user_count = 0;

/* tmp file to use to store old data (per interface)*/
$tmpfile = "{$g['vardb_path']}/captiveportal_online_users";

if (empty($type)) {
	exit;
}

/* echo the rrd required syntax */
echo "N:";
$result = "NaN";

if ($type == "loggedin") {

	/* Find out the previous user timestamp
	* so we can determine the difference between the current
	* and previous user count. If the file is empty return a 0.
	*/
	$fd = @fopen($tmpfile, "r");
	if ($fd) {
		while (!feof($fd)) {
			$line = trim(fgets($fd));
			if ($line) {
				$previous_user_timestamp = $line;
			} else {
				$previous_user_timestamp = 0;
			}
		}
	} else {
		$previous_user_timestamp = 0;
	}
	@fclose($fd);

	foreach ($cpdb as $user) {
		$user_ip = $user[2];
		// Record the timestamp
		$timestamp = $user[0];
		if ($timestamp > $previous_user_timestamp) {
			$current_user_count = $current_user_count + 1;
		}
	}

	// Write out the latest timestamp but not if it is empty
	if (!empty($timestamp)) {
		$fd = @fopen($tmpfile, "w");
		if ($fd) {
			fwrite($fd, $timestamp);
		}
		@fclose($fd);
	}

	/* If $timestamp is less than or equal to previous_user_timestamp return 0,
	 * as we only want the 'X' number of users logged in since last RRD poll.
	 */
	if ($timestamp <= $previous_user_timestamp) {
		$result = 0;
	} else {
		$result = $current_user_count;
	}
} elseif ($type == "concurrent") {
	$result = $no_users;
}

echo "$result";

?>
