tbl_replace_fields.php

   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 require_once('./libraries/common.lib.php');
  11
  12 PMA_checkParameters(array('db','encoded_key'));
  13
  14
  15 // f i e l d    u p l o a d e d    f r o m    a    f i l e
  16
  17 // garvin: original if-clause checked, whether input was stored in a possible fields_upload_XX var.
  18 // Now check, if the field is set. If it is empty or a malicious file, do not alter fields contents.
  19 // If an empty or invalid file is specified, the binary data gets deleter. Maybe a nice
  20 // new text-variable is appropriate to document this behaviour.
  21
  22 // garvin: security cautions! You could trick the form and submit any file the webserver has access to
  23 // for upload to a binary field. Shouldn't be that easy! ;)
  24
  25 // garvin: default is to advance to the field-value parsing. Will only be set to true when a
  26 // binary file is uploaded, thus bypassing further manipulation of $val.
  27
  28 $check_stop = false;
  29
  30 // Check if a multi-edit row was found
  31 ${'me_fields_upload_' . $encoded_key}      = (isset($enc_primary_key) && isset(${'fields_upload_' . $encoded_key}['multi_edit'])      ? ${'fields_upload_' . $encoded_key}['multi_edit'][$enc_primary_key]      : (isset(${'fields_upload_' . $encoded_key})      ? ${'fields_upload_' . $encoded_key}      : null));
  32 ${'me_fields_uploadlocal_' . $encoded_key} = (isset($enc_primary_key) && isset(${'fields_uploadlocal_' . $encoded_key}['multi_edit']) ? ${'fields_uploadlocal_' . $encoded_key}['multi_edit'][$enc_primary_key] : (isset(${'fields_uploadlocal_' . $encoded_key}) ? ${'fields_uploadlocal_' . $encoded_key} : null));
  33
  34 if (isset(${'me_fields_upload_' . $encoded_key}) && ${'me_fields_upload_' . $encoded_key} != 'none'){
  35     // garvin: This fields content is a blob-file upload.
  36
  37     if (!empty(${'me_fields_upload_' . $encoded_key})) {
  38         // garvin: The blob-field is not empty. Check what we have there.
  39
  40         $data_file = ${'me_fields_upload_' . $encoded_key};
  41
  42         if (is_uploaded_file($data_file)) {
  43             // garvin: A valid uploaded file is found. Look into the file...
  44
  45             $val = fread(fopen($data_file, 'rb'), filesize($data_file));
  46             // nijel: This is probably the best way how to put binary data
  47             // into MySQL and it also allow not to care about charset
  48             // conversion that would otherwise corrupt the data.
  49
  50             if (!empty($val)) {
  51                 // garvin: The upload was valid. Check in new blob-field's contents.
  52                 $val = '0x' . bin2hex($val);
  53                 $seen_binary = TRUE;
  54                 $check_stop = TRUE;
  55             }
  56             // garvin: ELSE: an empty file was uploaded. Remove blob-field's contents.
  57             // Blob-fields are preserved, see below. ($protected$)
  58
  59         } else {
  60             // garvin: Danger, will robinson. File is malicious. Blob-fields are preserved, see below. ($protected$)
  61             // void
  62         }
  63
  64     } elseif (!empty(${'me_fields_uploadlocal_' . $encoded_key})) {
  65         $file_to_upload = PMA_userDir($cfg['UploadDir']) . preg_replace('@\.\.*@', '.', ${'me_fields_uploadlocal_' . $encoded_key});
  66
  67         // A local file will be uploaded.
  68         $open_basedir = @ini_get('open_basedir');
  69
  70         // If we are on a server with open_basedir, we must move the file
  71         // before opening it. The doc explains how to create the "./tmp"
  72         // directory
  73
  74         $unlink = false;
  75         if (!empty($open_basedir)) {
  76
  77             $tmp_subdir = (PMA_IS_WINDOWS ? '.\\tmp\\' : './tmp/');
  78
  79             // function is_writeable() is valid on PHP3 and 4
  80             if (!is_writeable($tmp_subdir)) {
  81                 // if we cannot move the file don't change blob fields
  82                 $file_to_upload = '';
  83             } else {
  84                 $new_file_to_upload = $tmp_subdir . basename($file_to_upload);
  85                 move_uploaded_file($file_to_upload, $new_file_to_upload);
  86
  87                 $file_to_upload = $new_file_to_upload;
  88                 $unlink = true;
  89             }
  90         }
  91
  92         if ($file_to_upload != '') {
  93
  94             $val = fread(fopen($file_to_upload, 'rb'), filesize($file_to_upload));
  95             if (!empty($val)) {
  96                 $val = '0x' . bin2hex($val);
  97                 $seen_binary = TRUE;
  98                 $check_stop = TRUE;
  99             }
 100
 101             if ($unlink == TRUE) {
 102                 unlink($file_to_upload);
 103             }
 104         }
 105
 106     }
 107     // garvin: else: Post-field contains no data. Blob-fields are preserved, see below. ($protected$)
 108
 109 }
 110
 111 if (!$check_stop) {
 112
 113 // f i e l d    v a l u e    i n    t h e    f o r m
 114
 115     if (isset($me_fields_type[$encoded_key])) $type = $me_fields_type[$encoded_key];
 116     else $type = '';
 117
 118     $f = 'field_' . md5($key);
 119     $t_fval = (isset($$f) ? $$f : null);
 120
 121     if (isset($t_fval['multi_edit']) && isset($t_fval['multi_edit'][$enc_primary_key])) {
 122         $fval = &$t_fval['multi_edit'][$enc_primary_key];
 123     } else {
 124         $fval = null;
 125     }
 126
 127     switch (strtolower($val)) {
 128         // let users type NULL or null to input this string and not a NULL value
 129         //case 'null':
 130         //    break;
 131         case '':
 132             switch ($type) {
 133                 case 'enum':
 134                     // if we have an enum, then construct the value
 135                         if (!empty($fval)) {
 136                             $val     = implode(',', $fval);
 137                             if ($val == 'null') {
 138                                 // void
 139                             } else {
 140                                 // the data here is urlencoded
 141                                 $val = "'" . PMA_sqlAddslashes(urldecode($val)) . "'";
 142                             }
 143                         } else {
 144                             $val     = "''";
 145                         }
 146                         break;
 147                 case 'set':
 148                     // if we have a set, then construct the value
 149                     if (!empty($fval)) {
 150                         $val = implode(',', $fval);
 151                         // the data here is urlencoded
 152                         $val = "'" . PMA_sqlAddslashes(urldecode($val)) . "'";
 153                     } else {
 154                         $val = "''";
 155                     }
 156                     break;
 157                 case 'foreign':
 158                     // if we have a foreign key, then construct the value
 159                     if (!empty($fval)) {
 160                         $val     = implode(',', $fval);
 161                         if ($val == 'null') {
 162                             // void
 163                         } else {
 164                             // the data here is not urlencoded!
 165                             //$val = "'" . PMA_sqlAddslashes(urldecode($val)) . "'";
 166                             $val = "'" . PMA_sqlAddslashes($val) . "'";
 167                         }
 168                     } else {
 169                         $val     = "''";
 170                     }
 171                     break;
 172                 case 'protected':
 173                     // here we are in protected mode (asked in the config)
 174                     // so tbl_change has put this special value in the
 175                     // fields array, so we do not change the field value
 176                     // but we can still handle field upload
 177
 178                     // garvin: when in UPDATE mode, do not alter field's contents. When in INSERT
 179                     // mode, insert empty field because no values were submitted. If protected
 180                     // blobs where set, insert original fields content.
 181                     if (isset($fieldlist)) {
 182                         if (isset($prot_row) && isset($prot_row[$key]) && !empty($prot_row[$key])) {
 183                             $val = '0x' . bin2hex($prot_row[$key]);
 184                             $seen_binary = TRUE;
 185                         } else {
 186                             $val = "''";
 187                         }
 188                     } else {
 189                         unset($val);
 190                     }
 191
 192                     break;
 193                 default:
 194                     // best way to avoid problems in strict mode (works also in non-strict mode)
 195                     if (isset($me_auto_increment)  && isset($me_auto_increment[$encoded_key])) {
 196                         $val = 'NULL';
 197                     } else {
 198                         $val = "'" . PMA_sqlAddslashes($val) . "'";
 199                     }
 200                     break;
 201             }
 202             break;
 203         default:
 204             $val = "'" . PMA_sqlAddslashes($val) . "'";
 205             break;
 206     } // end switch
 207
 208     // Was the Null checkbox checked for this field?
 209     // (if there is a value, we ignore the Null checkbox: this could
 210     // be possible if Javascript is disabled in the browser)
 211     if (isset($me_fields_null) && isset($me_fields_null[$encoded_key])
 212         && $val=="''") {
 213         $val = 'NULL';
 214     }
 215 }  // end else (field value in the form)
 216 ?>