unlink??

Lamez · March 22, 2008

I got this error in my image upload script, the script it suppose to take the file trying to be uploaded, and resize it.

here is the error:

Warning: unlink() [function.unlink]: SAFE MODE Restriction in effect. The script whose uid/gid is 24543/24543 is not allowed to access /tmp/MKUPSHL08b owned by uid/gid 99/99 in /mounted-storage/home48c/sub007/sc33591-LWQU/lamezz.info/user/usrava/new_upload.php on line 68

here is the code with line 68 commented:

<html>

<head>
    <title>web.blazonry : PHP : Upload and Resize an Image</title>

<?php

if ($_SERVER['REQUEST_METHOD'] == "POST")
{

    /* SUBMITTED INFORMATION - use what you need
     * temporary filename (pointer): $imgfile
     * original filename           : $imgfile_name
     * size of uploaded file       : $imgfile_size
     * mime-type of uploaded file  : $imgfile_type
     */

     /*== upload directory where the file will be stored 
          relative to where script is run ==*/
    
    $uploaddir = ".";
    

    /*== get file extension (fn at bottom of script) ==*/
    /*== checks to see if image file, if not do not allow upload ==*/
    $pext = getFileExtension($imgfile_name);
    $pext = strtolower($pext);
    if (($pext != "jpg")  && ($pext != "jpeg") && ($pext != "png") && ($pext != "gif") && ($pext != "bmp") && ($pext != "tif"))
    {
        print "<h2>Error</h2>";
        print "<p>The file you are trying to upload is not a image.";
	print "<br> jpg, jpeg, png, gif, bmp, and tif are only accepted</p>";

        /*== delete uploaded file ==*/
        unlink($imgfile);
        exit();
    }


    //-- RE-SIZING UPLOADED IMAGE

    /*== only resize if the image is larger than 250 x 200 ==*/
    $imgsize = GetImageSize($imgfile);

    /*== check size  0=width, 1=height ==*/
    if (($imgsize[0] > 150) || ($imgsize[1] > 150)) 
    {
        /*== temp image file -- use "tempnam()" to generate the temp
             file name. This is done so if multiple people access the 
            script at once they won't ruin each other's temp file ==*/
        $tmpimg = tempnam("/tmp", "MKUP");

        /*== RESIZE PROCESS
             1. decompress jpeg image to pnm file (a raw image type) 
             2. scale pnm image
             3. compress pnm file to jpeg image
        ==*/
        
        /*== Step 1: djpeg decompresses jpeg to pnm ==*/
        system("djpeg $imgfile >$tmpimg");
        

        /*== Steps 2&3: scale image using pnmscale and then
             pipe into cjpeg to output jpeg file ==*/
        system("pnmscale -xy 150 150 $tmpimg | cjpeg -smoo 10 -qual 50 >$imgfile");

        /*== remove temp image ==*/
        unlink($tmpimg); #LINE 68

    }

    /*== setup final file location and name ==*/
    /*== change spaces to underscores in filename  ==*/
    $final_filename = str_replace(" ", "_", $imgfile_name);
    $newfile = $uploaddir . "/$final_filename";
    
    /*== do extra security check to prevent malicious abuse==*/
    if (is_uploaded_file($imgfile))
    {

       /*== move file to proper directory ==*/
       if (!copy($imgfile,"$newfile")) 
       {
          /*== if an error occurs the file could not
               be written, read or possibly does not exist ==*/
          print "Error Uploading File.";
          exit();
       }
     }

    /*== delete the temporary uploaded file ==*/
    unlink($imgfile);

    
    print("<img src=\"$final_filename\">");

    /*== DO WHATEVER ELSE YOU WANT
         SUCH AS INSERT DATA INTO A DATABASE  ==*/

}
?>


</head>
<body bgcolor="#FFFFFF">

    <h2>Upload and Resize an Image</h2>

    <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST" enctype="multipart/form-data">
    <input type="hidden" name="MAX_FILE_SIZE" value="1073741824">

    <p>Upload Image: <input type="file" name="imgfile"><br>
    <font size="1">Click browse to upload a local file</font><br>
    <br>
    <input type="submit" value="Upload Image">
    </form>

</body>
</html>

<?php
    /*== FUNCTIONS ==*/

    function getFileExtension($str) {

        $i = strrpos($str,".");
        if (!$i) { return ""; }

        $l = strlen($str) - $i;
        $ext = substr($str,$i+1,$l);

        return $ext;

    }
?>

I know it is safe mode restrictions, but what does unlink do? How can I fix this?

Barand · March 22, 2008

... but what does unlink do?

www.php.net/unlink

mVeliki · March 22, 2008

There is no cure against safe mode.

Try to delete this file via FTP, or wait for PHP 6 where safe mode will be removed (as i read somewhere).

redarrow · March 22, 2008

try this please if it works dont remove the @

<?php
                @chmod( $tmpimg, 0777 );
                @unlink( $tmpimg );
?>

redarrow · March 22, 2008

ftp way m8...

<?php

// set up the settings
$file = $tmpimg;

$ftp_server = 'something.net';
$ftpuser = 'username';
$ftppass = 'pass';

// set up basic connection
$conn_id = ftp_connect($ftp_server);

// login with username and password
$login_result = ftp_login($conn_id, $ftpuser, $ftppass);

// try to delete $file
if (ftp_delete($conn_id, $file)) { // the ftp function
echo "$file deleted successful\n";
} else {
echo "could not delete $file\n";
}

// close the connection
ftp_close($conn_id);

?>

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