tbl_replace_fields.php3

   1 <?php
   2 /* $Id$ */
   3 // vim: expandtab sw=4 ts=4 sts=4:
   4
   5 // note: grab_globals has extracted the fields from _FILES
   6 //       or HTTP_POST_FILES
   7
   8 // Check parameters
   9
  10 if (!defined('PMA_COMMON_LIB_INCLUDED')) {
  11     include('./libraries/common.lib.php3');
  12 }
  13
  14 PMA_checkParameters(array('db','encoded_key'));
  15
  16
  17 // f i e l d    u p l o a d e d    f r o m    a    f i l e
  18
  19 // garvin: original if-clause checked, whether input was stored in a possible fields_upload_XX var.
  20 // Now check, if the field is set. If it is empty or a malicious file, do not alter fields contents.
  21 // If an empty or invalid file is specified, the binary data gets deleter. Maybe a nice
  22 // new text-variable is appropriate to document this behaviour.
  23
  24 // garvin: security cautions! You could trick the form and submit any file the webserver has access to
  25 // for upload to a binary field. Shouldn't be that easy! ;)
  26
  27 // garvin: default is to advance to the field-value parsing. Will only be set to true when a
  28 // binary file is uploaded, thus bypassing further manipulation of $val.
  29
  30 $check_stop = false;
  31 if (isset(${"fields_upload_" . $encoded_key}) && ${"fields_upload_" . $encoded_key} != 'none'){
  32     // garvin: This fields content is a blob-file upload.
  33
  34     if (!empty(${"fields_upload_" . $encoded_key})) {
  35         // garvin: The blob-field is not empty. Check what we have there.
  36
  37         $data_file = ${"fields_upload_" . $encoded_key};
  38
  39         if (is_uploaded_file($data_file)) {
  40             // garvin: A valid uploaded file is found. Look into the file...
  41
  42             $val = fread(fopen($data_file, "rb"), filesize($data_file));
  43             // nijel: This is probably the best way how to put binary data
  44             // into MySQL and it also allow not to care about charset
  45             // conversion that would otherwise corrupt the data.
  46
  47             if (!empty($val)) {
  48                 // garvin: The upload was valid. Check in new blob-field's contents.
  49                 $val = '0x' . bin2hex($val);
  50                 $seen_binary = TRUE;
  51                 $check_stop = TRUE;
  52             }
  53             // garvin: ELSE: an empty file was uploaded. Remove blob-field's contents.
  54             // Blob-fields are preserved, see below. ($protected$)
  55
  56         } else {
  57             // garvin: Danger, will robinson. File is malicious. Blob-fields are preserved, see below. ($protected$)
  58             // void
  59         }
  60
  61     } elseif (!empty(${'fields_uploadlocal_' . $encoded_key})) {
  62         $file_to_upload = $cfg['UploadDir'] . eregi_replace('\.\.*', '.', ${'fields_uploadlocal_' . $encoded_key});
  63
  64         // A local file will be uploaded.
  65         $open_basedir     = '';
  66         if (PMA_PHP_INT_VERSION >= 40000) {
  67             $open_basedir = @ini_get('open_basedir');
  68         }
  69         if (empty($open_basedir)) {
  70             $open_basedir = @get_cfg_var('open_basedir');
  71         }
  72
  73         // If we are on a server with open_basedir, we must move the file
  74         // before opening it. The doc explains how to create the "./tmp"
  75         // directory
  76
  77         $unlink = false;
  78         if (!empty($open_basedir)) {
  79
  80             $tmp_subdir = (PMA_IS_WINDOWS ? '.\\tmp\\' : './tmp/');
  81
  82             // function is_writeable() is valid on PHP3 and 4
  83             if (!is_writeable($tmp_subdir)) {
  84                 // if we cannot move the file don't change blob fields
  85                 $file_to_upload = '';
  86             } else {
  87                 $new_file_to_upload = $tmp_subdir . basename($file_to_upload);
  88                 if (PMA_PHP_INT_VERSION < 40003) {
  89                     copy($file_to_upload, $new_file_to_upload);
  90                 } else {
  91                     move_uploaded_file($file_to_upload, $new_file_to_upload);
  92                 }
  93
  94                 $file_to_upload = $new_file_to_upload;
  95                 $unlink = true;
  96             }
  97         }
  98
  99         if ($file_to_upload != '') {
 100
 101             $val = fread(fopen($file_to_upload, "rb"), filesize($file_to_upload));
 102             if (!empty($val)) {
 103                 $val = '0x' . bin2hex($val);
 104                 $seen_binary = TRUE;
 105                 $check_stop = TRUE;
 106             }
 107
 108             if ($unlink == TRUE) {
 109                 unlink($file_to_upload);
 110             }
 111         }
 112
 113     }
 114     // garvin: else: Post-field contains no data. Blob-fields are preserved, see below. ($protected$)
 115
 116 }
 117
 118 if (!$check_stop) {
 119 // f i e l d    v a l u e    i n    t h e    f o r m
 120     if (isset($fields_type[$encoded_key])) $type = $fields_type[$encoded_key];
 121     else $type = '';
 122     switch (strtolower($val)) {
 123         case 'null':
 124             break;
 125         case '':
 126             switch ($type) {
 127                 case 'enum':
 128                     // if we have an enum, then construct the value
 129                         $f = 'field_' . md5($key);
 130                         if (!empty($$f)) {
 131                             $val     = implode(',', $$f);
 132                             if ($val == 'null') {
 133                                 // void
 134                             } else {
 135                                 // the data here is not urlencoded!
 136                                 //$val = "'" . PMA_sqlAddslashes(urldecode($val)) . "'";
 137                                 $val = "'" . PMA_sqlAddslashes($val) . "'";
 138                             }
 139                         } else {
 140                             $val     = "''";
 141                         }
 142                         break;
 143                 case 'set':
 144                     // if we have a set, then construct the value
 145                     $f = 'field_' . md5($key);
 146                     if (!empty($$f)) {
 147                         $val = implode(',', $$f);
 148                         // the data here is not urlencoded!
 149                         //$val = "'" . PMA_sqlAddslashes(urldecode($val)) . "'";
 150                         $val = "'" . PMA_sqlAddslashes($val) . "'";
 151                     } else {
 152                         $val = "''";
 153                     }
 154                     break;
 155                 case 'foreign':
 156                     // if we have a foreign key, then construct the value
 157                     $f = 'field_' . md5($key);
 158                     if (!empty($$f)) {
 159                         $val     = implode(',', $$f);
 160                         if ($val == 'null') {
 161                             // void
 162                         } else {
 163                             // the data here is not urlencoded!
 164                             //$val = "'" . PMA_sqlAddslashes(urldecode($val)) . "'";
 165                             $val = "'" . PMA_sqlAddslashes($val) . "'";
 166                         }
 167                     } else {
 168                         $val     = "''";
 169                     }
 170                     break;
 171                 case 'protected':
 172                     // here we are in protected mode (asked in the config)
 173                     // so tbl_change has put this special value in the
 174                     // fields array, so we do not change the field value
 175                     // but we can still handle field upload
 176
 177                     // garvin: when in UPDATE mode, do not alter field's contents. When in INSERT
 178                     // mode, insert empty field because no values were submitted. If protected
 179                     // blobs where set, insert original fields content.
 180                     if (isset($fieldlist)) {
 181                         if (isset($prot_row) && isset($prot_row[$key]) && !empty($prot_row[$key])) {
 182                             $val = '0x' . bin2hex($prot_row[$key]);
 183                             $seen_binary = TRUE;
 184                         } else {
 185                             $val = "''";
 186                         }
 187                     } else {
 188                         unset($val);
 189                     }
 190
 191                     break;
 192                 default:
 193                     $val = "'" . PMA_sqlAddslashes($val) . "'";
 194                     break;
 195             }
 196             break;
 197         default:
 198             $val = "'" . PMA_sqlAddslashes($val) . "'";
 199             break;
 200     } // end switch
 201
 202     // Was the Null checkbox checked for this field?
 203     // (if there is a value, we ignore the Null checkbox: this could
 204     // be possible if Javascript is disabled in the browser)
 205     if (isset($fields_null) && isset($fields_null[$encoded_key])
 206         && $val=="''") {
 207         $val = 'NULL';
 208     }
 209 }  // end else (field value in the form)
 210 ?>