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831 florian 1
<?php
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////////////////////////////////////////////////////////////////////////////////
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//                                                                            //
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//   Copyright (C) 2006  Phorum Development Team                              //
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//   http://www.phorum.org                                                    //
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//                                                                            //
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//   This program is free software. You can redistribute it and/or modify     //
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//   it under the terms of either the current Phorum License (viewable at     //
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//   phorum.org) or the Phorum License that was distributed with this file    //
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//                                                                            //
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//   This program is distributed in the hope that it will be useful,          //
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//   but WITHOUT ANY WARRANTY, without even the implied warranty of           //
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//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                     //
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//                                                                            //
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//   You should have received a copy of the Phorum License                    //
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//   along with this program.                                                 //
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////////////////////////////////////////////////////////////////////////////////
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    // Check if the Phorum file uploading settings match the
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    // limits that are imposed by the system.
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    // TODO (document in faq / documentation)
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    // The upload size can be limited by Apache's LimitRequestBody directive,
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    // but we cannot check that one from PHP.
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    require_once('./include/format_functions.php'); // For phorum_filesize()
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    $phorum_check = "File uploading (personal files and attachments)";
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    function phorum_check_upload_limits() {
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        $PHORUM = $GLOBALS["PHORUM"];
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        // Keep track if uploads are used.
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        $upload_used = false;
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        // Get the maximum file upload size for PHP.
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        $php_max_upload = phorum_php_max_upload();
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        // Get the maximum packet size for the database.
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        // For determining the maximum allowed upload size,
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        // we have to take packet overhead into account.
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        $max_packetsize = phorum_db_maxpacketsize();
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        if ($max_packetsize == NULL) {
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            $db_max_upload = $php_max_upload;
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        } else {
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            $db_max_upload = phorum_db_maxpacketsize() * 0.6;
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        }
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        // Check limits for file uploading in personal profile.
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        if ($PHORUM["file_uploads"] && $PHORUM["max_file_size"]) {
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            $upload_used = true;
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            $res = phorum_single_check_upload_limits(
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                $PHORUM["max_file_size"]*1024,
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                "the Max File Size option for user file uploads " .
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                "(in their profile)",
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                $php_max_upload, $db_max_upload
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            );
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            if ($res != NULL) return $res;
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        }
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        // Check limits for attachment uploading in forums.
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        $forums = phorum_db_get_forums();
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        foreach ($forums as $id => $forum) {
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            if ($forum["max_attachments"] > 0 && $forum["max_attachment_size"]) {
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                $upload_used = true;
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                $res = phorum_single_check_upload_limits(
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                    $forum["max_attachment_size"]*1024,
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                    "the Max File Size option for uploading attachments
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                     in the forum \"{$forum['name']}\"",
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                    $php_max_upload, $db_max_upload
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                );
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            }
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        }
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        // No upload functionality found so far? Then we're done.
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        if (! $upload_used) return array(PHORUM_SANITY_OK, NULL);
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        // Check if the upload temp directory can be written.
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        $tmpdir = get_cfg_var('upload_tmp_dir');
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        if (!empty($tmpdir)) {
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            $fp = @fopen("$tmpdir/sanity_checks_dummy_uploadtmpfile", "w");
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            if (! $fp) return array(
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                PHORUM_SANITY_CRIT,
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                "The system is unable to write files
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                 to PHP's upload tmpdir \"".htmlspecialchars($tmpdir)."\".
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                 The system error was:<br/><br/>".
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                 htmlspecialchars($php_errormsg).".",
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                "Change the upload_tmp_dir setting in your php.ini file
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                 or give your webserver more permissions for the current
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                 upload directory."
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            );
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        }
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        fclose($fp);
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        unlink("$tmpdir/sanity_checks_dummy_uploadtmpfile");
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        return array(PHORUM_SANITY_OK, NULL);
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    }
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    // ========================================================================
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    // Helper functions
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    // ========================================================================
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    // We have to check multiple upload limits. Using this function,
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    // we do not have to rebuild all error messages over and over
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    // again.
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    function phorum_single_check_upload_limits ($howmuch, $what, $maxphp, $maxdb)
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    {
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        // Check PHP limits.
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        if (!empty($maxphp) && $howmuch > $maxphp) return array(
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            PHORUM_SANITY_WARN,
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            "You have configured ".htmlspecialchars($what)." to ".
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             phorum_filesize($howmuch).". Your PHP installation only
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             supports ".phorum_filesize($maxphp).". Your users might
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             have problems with uploading their files because of this.",
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            "Raise the options post_max_size and upload_max_filesize in your
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             php.ini file to match the Max File Size option or lower this
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             configuration option for your forums."
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        );
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        // Check database limits.
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        if (!empty($maxdb) && $howmuch > $maxdb) return array(
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            PHORUM_SANITY_WARN,
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            "You have configured ".htmlspecialchars($what)." to ".
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             phorum_filesize($howmuch).". Your database only supports ".
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             phorum_filesize($maxdb).". Your users might have problems with
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             uploading their files because of this.",
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            "Configure your database to allow larger packets or lower the
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             Max File Size configuration option for your forums."
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        );
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        return NULL;
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    }
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    function phorum_php_max_upload()
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    {
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        // Determine the PHP system upload limit. The limit for
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        // maximum upload filesize is not the only thing we
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        // have to look at. We should also take the maximum
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        // POST size in account.
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        $pms = phorum_phpcfgsize2bytes(get_cfg_var('post_max_size'));
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        $umf = phorum_phpcfgsize2bytes(get_cfg_var('upload_max_filesize'));
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        $limit = ($umf > $pms ? $pms : $umf);
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        return $limit;
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    }
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    // Convert the size parameters that can be used in the
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    // PHP ini-file (e.g. 1024, 10k, 8M) to a number of bytes.
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    function phorum_phpcfgsize2bytes($val) {
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        $val = trim($val);
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        $last = strtolower($val{strlen($val)-1});
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        switch($last) {
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           // The 'G' modifier is available since PHP 5.1.0
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           case 'g':
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               $val *= 1024;
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           case 'm':
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               $val *= 1024;
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           case 'k':
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               $val *= 1024;
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        }
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        return $val;
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    }
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?>