pfSense

<?php

/*

 * live_logs.inc

 *

 * part of pfSense (https://www.pfsense.org)

 * Copyright (c) 2023 Rubicon Communications, LLC (Netgate)

 * All rights reserved.

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

/*

 * Uses bytes to read the file unless line number is specified; reading using

 * bytes is slightly quicker, but line numbers can be helpful.

 */

function checkForAjaxLog($file) {

	$response = [];

	$maxRead = (isset($_REQUEST['maxRead'])) ? $_REQUEST['maxRead'] : null;

	if (isset($_REQUEST['line'])) {

		$response['linesRead'] = 0;

		$response['output'] = '';

		if ($maxRead != 0)  {

			$line = $_REQUEST['line'];

			$fp = new SplFileObject($file);

			$fp->seek($line);

			for ($i = 0; !$fp->eof(); $i++) {

				$response['output'] .= $fp->current();

				$fp->next();

				$response['linesRead']++;

				if ($maxRead != null && $maxRead >= $response['linesRead']) {

					break;

				}

			}

			$fp = null;

		}

	} else {

		$response['bytesRead'] = 0;

		$response['output'] = '';

		if ($maxRead != 0) {

			$byte = (isset($_REQUEST['byte'])) ? $_REQUEST['byte'] : 0;

			$fp = fopen($file, 'rb');

			fseek($fp, $byte);

			if ($maxRead != null) {

				$response['output'] = fread($fp, $maxRead);

			} else {

				while (!feof($fp)) {

					$response['output'] .= fread($fp, 8192);

				}

			}

			$response['bytesRead'] = ftell($fp) - $byte;

			fclose($fp);

		}

	}

	echo json_encode($response);

}