X-Git-Url: https://git.p6c8.net/devedit.git/blobdiff_plain/aeaff6f362f8e376c592469db74f9da3434ecacc..9020a0a5805da403b5564f2bd77d01722f459fab:/modules/Command.pm?ds=sidebyside

diff --git a/modules/Command.pm b/modules/Command.pm
index 8e47163..73f9fb4 100644
--- a/modules/Command.pm
+++ b/modules/Command.pm
@@ -5,8 +5,8 @@ package Command;
 #
 # Execute Dev-Editor's commands
 #
-# Author:        Patrick Canterino <patshaping@gmx.net>
-# Last modified: 2004-07-28
+# Author:        Patrick Canterino <patrick@patshaping.de>
+# Last modified: 2004-12-20
 #
 
 use strict;
@@ -25,7 +25,7 @@ use HTML::Entities;
 use Output;
 use Template;
 
-my $script = $ENV{'SCRIPT_NAME'};
+my $script = encode_entities($ENV{'SCRIPT_NAME'});
 my $users  = eval("getpwuid(0)") && eval("getgrgid(0)");
 
 my %dispatch = ('show'       => \&exec_show,
@@ -72,7 +72,7 @@ sub exec_command($$$)
   }
  }
 
- return error($config->{'errors'}->{'cmd_unknown'},'/',{COMMAND => $command});
+ return error($config->{'errors'}->{'cmd_unknown'},'/',{COMMAND => encode_entities($command)});
 }
 
 # exec_show()
@@ -89,6 +89,7 @@ sub exec_show($$)
  my ($data,$config) = @_;
  my $physical       = $data->{'physical'};
  my $virtual        = $data->{'virtual'};
+ my $upper_path     = encode_entities(upper_path($virtual));
  my $uselist        = $data->{'uselist'};
 
  my $tpl = new Template;
@@ -97,12 +98,16 @@ sub exec_show($$)
  {
   # Create directory listing
 
+  return error($config->{'errors'}->{'no_dir_access'},$upper_path) unless(-r $physical && -x $physical);
+
   my $direntries = dir_read($physical);
-  return error($config->{'dir_read_failed'},upper_path($virtual),{DIR => '$virtual'}) unless($direntries);
+  return error($config->{'dir_read_fail'},$upper_path,{DIR => encode_entities($virtual)}) unless($direntries);
 
   my $files = $direntries->{'files'};
   my $dirs  = $direntries->{'dirs'};
 
+  my $dir_writeable = -w $physical;
+
   my $dirlist = "";
 
   # Create the link to the upper directory
@@ -115,8 +120,8 @@ sub exec_show($$)
    my $udtpl = new Template;
    $udtpl->read_file($config->{'templates'}->{'dirlist_up'});
 
-   $udtpl->fillin("UPPER_DIR",encode_entities(upper_path($virtual)));
-   $udtpl->fillin("DATE",strftime($config->{'timeformat'},localtime($stat[9])));
+   $udtpl->fillin("UPPER_DIR",$upper_path);
+   $udtpl->fillin("DATE",encode_entities(strftime($config->{'timeformat'},localtime($stat[9]))));
 
    $dirlist .= $udtpl->get_template;
   }
@@ -125,18 +130,21 @@ sub exec_show($$)
 
   foreach my $dir(@$dirs)
   {
-   my @stat      = stat($physical."/".$dir);
+   my $phys_path = $physical."/".$dir;
    my $virt_path = encode_entities($virtual.$dir."/");
 
+   my @stat      = stat($phys_path);
+
    my $dtpl = new Template;
    $dtpl->read_file($config->{'templates'}->{'dirlist_dir'});
 
    $dtpl->fillin("DIR",$virt_path);
-   $dtpl->fillin("DIR_NAME",$dir);
-   $dtpl->fillin("DATE",strftime($config->{'timeformat'},localtime($stat[9])));
-   $dtpl->fillin("URL",equal_url($config->{'httproot'},$virt_path));
+   $dtpl->fillin("DIR_NAME",encode_entities($dir));
+   $dtpl->fillin("DATE",encode_entities(strftime($config->{'timeformat'},localtime($stat[9]))));
+   $dtpl->fillin("URL",equal_url(encode_entities($config->{'httproot'}),$virt_path));
 
-   $dtpl->parse_if_block("users",$users && -o $physical."/".$dir);
+   $dtpl->parse_if_block("readable",-r $phys_path && -x $phys_path);
+   $dtpl->parse_if_block("users",$users && -o $phys_path);
 
    $dirlist .= $dtpl->get_template;
   }
@@ -150,23 +158,23 @@ sub exec_show($$)
 
    my @stat      = stat($phys_path);
    my $in_use    = $uselist->in_use($virtual.$file);
+   my $too_large = $config->{'max_file_size'} && $stat[7] > $config->{'max_file_size'};
 
    my $ftpl = new Template;
    $ftpl->read_file($config->{'templates'}->{'dirlist_file'});
 
    $ftpl->fillin("FILE",$virt_path);
-   $ftpl->fillin("FILE_NAME",$file);
+   $ftpl->fillin("FILE_NAME",encode_entities($file));
    $ftpl->fillin("SIZE",$stat[7]);
-   $ftpl->fillin("DATE",strftime($config->{'timeformat'},localtime($stat[9])));
-   $ftpl->fillin("URL",equal_url($config->{'httproot'},$virt_path));
+   $ftpl->fillin("DATE",encode_entities(strftime($config->{'timeformat'},localtime($stat[9]))));
+   $ftpl->fillin("URL",equal_url(encode_entities($config->{'httproot'}),$virt_path));
 
    $ftpl->parse_if_block("not_readable",not -r $phys_path);
    $ftpl->parse_if_block("binary",-B $phys_path);
    $ftpl->parse_if_block("readonly",not -w $phys_path);
 
-   $ftpl->parse_if_block("viewable",-r $phys_path && -T $phys_path && not ($config->{'max_file_size'} && $stat[7] > $config->{'max_file_size'}));
-
-   $ftpl->parse_if_block("editable",-r $phys_path && -w $phys_path && -T $phys_path && not ($config->{'max_file_size'} && $stat[7] > $config->{'max_file_size'}) && not $in_use);
+   $ftpl->parse_if_block("viewable",-r $phys_path && -T $phys_path && not $too_large);
+   $ftpl->parse_if_block("editable",(-r $phys_path && -w $phys_path && -T $phys_path && not $too_large) && not $in_use);
 
    $ftpl->parse_if_block("in_use",$in_use);
    $ftpl->parse_if_block("unused",not $in_use);
@@ -181,15 +189,17 @@ sub exec_show($$)
   $tpl->read_file($config->{'templates'}->{'dirlist'});
 
   $tpl->fillin("DIRLIST",$dirlist);
-  $tpl->fillin("DIR",$virtual);
+  $tpl->fillin("DIR",encode_entities($virtual));
   $tpl->fillin("SCRIPT",$script);
-  $tpl->fillin("URL",equal_url($config->{'httproot'},$virtual));
+  $tpl->fillin("URL",encode_entities(equal_url($config->{'httproot'},$virtual)));
+
+  $tpl->parse_if_block("dir_writeable",$dir_writeable);
  }
  else
  {
   # View a file
 
-  return error($config->{'errors'}->{'noview'},upper_path($virtual)) unless(-r $physical);
+  return error($config->{'errors'}->{'no_view'},$upper_path) unless(-r $physical);
 
   # Check on binary files
   # We have to do it in this way, or empty files
@@ -199,17 +209,15 @@ sub exec_show($$)
   {
    # Binary file
 
-   return error($config->{'errors'}->{'binary'},upper_path($virtual));
+   return error($config->{'errors'}->{'binary'},$upper_path);
   }
   else
   {
    # Text file
 
-   my $size = (stat($physical))[7];
-
-   if($config->{'max_file_size'} && $size > $config->{'max_file_size'})
+   if($config->{'max_file_size'} && -s $physical > $config->{'max_file_size'})
    {
-    return error($config->{'errors'}->{'file_too_large'},upper_path($virtual),{SIZE => $config->{'max_file_size'}})
+    return error($config->{'errors'}->{'file_too_large'},$upper_path,{SIZE => $config->{'max_file_size'}})
    }
    else
    {
@@ -218,13 +226,14 @@ sub exec_show($$)
 
     $tpl->read_file($config->{'templates'}->{'viewfile'});
 
-    $tpl->fillin("FILE",$virtual);
-    $tpl->fillin("DIR",upper_path($virtual));
-    $tpl->fillin("URL",equal_url($config->{'httproot'},$virtual));
+    $tpl->fillin("FILE",encode_entities($virtual));
+    $tpl->fillin("DIR",$upper_path);
+    $tpl->fillin("URL",encode_entities(equal_url($config->{'httproot'},$virtual)));
     $tpl->fillin("SCRIPT",$script);
-    $tpl->fillin("CONTENT",encode_entities($$content));
 
-    $tpl->parse_if_block("editable",-r $physical && -w $physical && -T $physical && not ($config->{'max_file_size'} && $size > $config->{'max_file_size'}) && $uselist->unused($virtual));
+    $tpl->parse_if_block("editable",-w $physical && $uselist->unused($virtual));
+
+    $tpl->fillin("CONTENT",encode_entities($$content));
    }
   }
  }
@@ -249,11 +258,12 @@ sub exec_beginedit($$)
  my ($data,$config) = @_;
  my $physical       = $data->{'physical'};
  my $virtual        = $data->{'virtual'};
+ my $dir            = upper_path($virtual);
  my $uselist        = $data->{'uselist'};
 
- return error($config->{'errors'}->{'editdir'},upper_path($virtual))                   if(-d $physical);
- return error($config->{'errors'}->{'in_use'},upper_path($virtual),{FILE => $virtual}) if($uselist->in_use($virtual));
- return error($config->{'errors'}->{'noedit'},upper_path($virtual))                    unless(-r $physical && -w $physical);
+ return error($config->{'errors'}->{'editdir'},$dir)                    if(-d $physical);
+ return error($config->{'errors'}->{'in_use'}, $dir,{FILE => $virtual}) if($uselist->in_use($virtual));
+ return error($config->{'errors'}->{'no_edit'},$dir)                    unless(-r $physical && -w $physical);
 
  # Check on binary files
 
@@ -261,16 +271,16 @@ sub exec_beginedit($$)
  {
   # Binary file
 
-  return error($config->{'errors'}->{'binary'},upper_path($virtual));
+  return error($config->{'errors'}->{'binary'},$dir);
  }
  else
  {
-  if($config->{'max_file_size'} && (stat($physical))[7] > $config->{'max_file_size'})
+  if($config->{'max_file_size'} && -s $physical > $config->{'max_file_size'})
   {
-   return error($config->{'errors'}->{'file_too_large'},upper_path($virtual),{SIZE => $config->{'max_file_size'}})
+   return error($config->{'errors'}->{'file_too_large'},$dir,{SIZE => $config->{'max_file_size'}})
   }
   else
-   {
+  {
    # Text file
 
    $uselist->add_file($virtual);
@@ -283,7 +293,7 @@ sub exec_beginedit($$)
    $tpl->read_file($config->{'templates'}->{'editfile'});
 
    $tpl->fillin("FILE",$virtual);
-   $tpl->fillin("DIR",upper_path($virtual));
+   $tpl->fillin("DIR",$dir);
    $tpl->fillin("URL",equal_url($config->{'httproot'},$virtual));
    $tpl->fillin("SCRIPT",$script);
    $tpl->fillin("CONTENT",encode_entities($$content));
@@ -328,9 +338,17 @@ sub exec_endedit($$)
  my ($data,$config) = @_;
  my $physical       = $data->{'physical'};
  my $virtual        = $data->{'virtual'};
+ my $dir            = upper_path($virtual);
  my $content        = $data->{'cgi'}->param('filecontent');
  my $uselist        = $data->{'uselist'};
 
+ # We already unlock the file at the beginning of the subroutine,
+ # because if we have to abort this routine, the file keeps locked.
+ # No other user of Dev-Editor will access the file during this
+ # routine because of the concept of File::UseList.
+
+ file_unlock($uselist,$virtual);
+
  # Normalize newlines
 
  $content =~ s/\015\012|\012|\015/\n/g;
@@ -342,7 +360,7 @@ sub exec_endedit($$)
   $content = encode_entities($content,"\200-\377");
  }
 
- if($data->{'cgi'}->param('saveas'))
+ if($data->{'cgi'}->param('saveas') && $data->{'new_physical'} ne '' && $data->{'new_virtual'} ne '')
  {
   # Create the new filename
 
@@ -351,26 +369,22 @@ sub exec_endedit($$)
 
   # Check if someone else is editing the new file
 
-  return error($config->{'errors'}->{'in_use'},upper_path($virtual),{FILE => $virtual}) if($uselist->in_use($virtual));
+  return error($config->{'errors'}->{'in_use'},$dir,{FILE => $virtual}) if($uselist->in_use($virtual));
  }
 
- return error($config->{'errors'}->{'editdir'},upper_path($virtual)) if(-d $physical);
- return error($config->{'errors'}->{'noedit'}, upper_path($virtual)) unless(-r $physical && -w $physical);
+ return error($config->{'errors'}->{'editdir'},$dir)        if(-d $physical);
+ return error($config->{'errors'}->{'no_edit'},$dir)        if(-e $physical && !(-r $physical && -w $physical));
+ return error($config->{'errors'}->{'text_to_binary'},$dir) unless(-T $physical);
 
  if(file_save($physical,\$content))
  {
-  # Saving of the file was successful - so unlock it!
-
-  file_unlock($uselist,$data->{'virtual'});
-  #                    ^^^^^^^^^^^^^^^^^^
-  # Maybe the user saved the file using another filename...
-  # But we have to unlock the original file!
+  # Saving of the file was successful!
 
-  return devedit_reload({command => 'show', file => upper_path($virtual)});
+  return devedit_reload({command => 'show', file => $dir});
  }
  else
  {
-  return error($config->{'errors'}->{'edit_failed'},upper_path($virtual),{FILE => $virtual});
+  return error($config->{'errors'}->{'edit_failed'},$dir,{FILE => $virtual});
  }
 }
 
@@ -468,31 +482,28 @@ sub exec_upload($$)
  my $virtual        = $data->{'virtual'};
  my $cgi            = $data->{'cgi'};
 
+ return error($config->{'errors'}->{'no_directory'},upper_path($virtual),{FILE => $virtual}) unless(-d $physical);
+ return error($config->{'errors'}->{'dir_no_create'},$virtual,{DIR => $virtual})             unless(-w $physical);
+
  if(my $uploaded_file = $cgi->param('uploaded_file'))
  {
   # Process file upload
 
   my $filename  = file_name($uploaded_file);
   my $file_phys = $physical."/".$filename;
-  my $file_virt = $virtual."".$filename;
+  my $file_virt = $virtual.$filename;
 
-  return error($config->{'errors'}->{'file_exists'},$virtual,{FILE => $file_virt}) if(-e $file_phys);
+  return error($config->{'errors'}->{'in_use'},$virtual,{FILE => $file_virt})      if($data->{'uselist'}->in_use($file_virt));
+  return error($config->{'errors'}->{'file_exists'},$virtual,{FILE => $file_virt}) if(-e $file_phys && not $cgi->param('overwrite'));
 
   my $ascii     = $cgi->param('ascii');
   my $handle    = $cgi->upload('uploaded_file');
 
-  local *FILE;
-
-  open(FILE,">$file_phys") or return error($config->{'errors'}->{'mkfile_failed'},$virtual,{FILE => $file_virt});
-  binmode(FILE) unless($ascii);
-
   # Read transferred file and write it to disk
 
   read($handle, my $data, -s $handle);
   $data =~ s/\015\012|\012|\015/\n/g if($ascii); # Replace line separators if transferring in ASCII mode
-  print FILE $data;
-
-  close(FILE);
+  file_save($file_phys,\$data,not $ascii) or return error($config->{'errors'}->{'mkfile_failed'},$virtual,{FILE => $file_virt});
 
   return devedit_reload({command => "show", file => $virtual});
  }
@@ -526,23 +537,25 @@ sub exec_copy($$)
  my ($data,$config) = @_;
  my $physical       = $data->{'physical'};
  my $virtual        = encode_entities($data->{'virtual'});
+ my $dir            = upper_path($virtual);
  my $new_physical   = $data->{'new_physical'};
 
- return error($config->{'errors'}->{'nocopy'}) unless(-r $physical);
+ return error($config->{'errors'}->{'dircopy'},$dir) if(-d $physical);
+ return error($config->{'errors'}->{'no_copy'},$dir) unless(-r $physical);
 
  if($new_physical)
  {
   my $new_virtual = $data->{'new_virtual'};
-  my $dir         = upper_path($new_virtual);
+  my $new_dir     = upper_path($new_virtual);
   $new_virtual    = encode_entities($new_virtual);
 
   if(-e $new_physical)
   {
-   return error($config->{'errors'}->{'exist_edited'},$dir,{FILE => $new_virtual}) if($data->{'uselist'}->in_use($data->{'new_virtual'}));
+   return error($config->{'errors'}->{'exist_edited'},$new_dir,{FILE => $new_virtual}) if($data->{'uselist'}->in_use($data->{'new_virtual'}));
 
    if(-d $new_physical)
    {
-    return error($config->{'errors'}->{'dircopy'});
+    return error($config->{'errors'}->{'dir_replace'},$new_dir);
    }
    elsif(not $data->{'cgi'}->param('confirmed'))
    {
@@ -552,8 +565,8 @@ sub exec_copy($$)
     $tpl->fillin("FILE",$virtual);
     $tpl->fillin("NEW_FILE",$new_virtual);
     $tpl->fillin("NEW_FILENAME",file_name($new_virtual));
-    $tpl->fillin("NEW_DIR",$dir);
-    $tpl->fillin("DIR",upper_path($virtual));
+    $tpl->fillin("NEW_DIR",$new_dir);
+    $tpl->fillin("DIR",$dir);
 
     $tpl->fillin("COMMAND","copy");
     $tpl->fillin("URL",equal_url($config->{'httproot'},$virtual));
@@ -566,8 +579,8 @@ sub exec_copy($$)
    }
   }
 
-  copy($physical,$new_physical) or return error($config->{'errors'}->{'copy_failed'},upper_path($virtual),{FILE => $virtual, NEW_FILE => $new_virtual});
-  return devedit_reload({command => 'show', file => $dir});
+  copy($physical,$new_physical) or return error($config->{'errors'}->{'copy_failed'},$dir,{FILE => $virtual, NEW_FILE => $new_virtual});
+  return devedit_reload({command => 'show', file => $new_dir});
  }
  else
  {
@@ -575,7 +588,7 @@ sub exec_copy($$)
   $tpl->read_file($config->{'templates'}->{'copyfile'});
 
   $tpl->fillin("FILE",$virtual);
-  $tpl->fillin("DIR",upper_path($virtual));
+  $tpl->fillin("DIR",$dir);
   $tpl->fillin("URL",equal_url($config->{'httproot'},$virtual));
   $tpl->fillin("SCRIPT",$script);
 
@@ -600,24 +613,26 @@ sub exec_rename($$)
  my ($data,$config) = @_;
  my $physical       = $data->{'physical'};
  my $virtual        = $data->{'virtual'};
+ my $dir            = upper_path($virtual);
  my $new_physical   = $data->{'new_physical'};
 
- return error($config->{'errors'}->{'rename_root'},"/") if($virtual eq "/");
- return error($config->{'errors'}->{'in_use'},upper_path($virtual),{FILE => $virtual}) if($data->{'uselist'}->in_use($virtual));
+ return error($config->{'errors'}->{'rename_root'},"/")                if($virtual eq "/");
+ return error($config->{'errors'}->{'no_rename'},$dir)                 unless(-w upper_path($physical));
+ return error($config->{'errors'}->{'in_use'},$dir,{FILE => $virtual}) if($data->{'uselist'}->in_use($virtual));
 
  if($new_physical)
  {
   my $new_virtual = $data->{'new_virtual'};
-  my $dir         = upper_path($new_virtual);
+  my $new_dir     = upper_path($new_virtual);
   $new_virtual    = encode_entities($new_virtual);
 
   if(-e $new_physical)
   {
-   return error($config->{'errors'}->{'exist_edited'},$dir,{FILE => $new_virtual}) if($data->{'uselist'}->in_use($data->{'new_virtual'}));
+   return error($config->{'errors'}->{'exist_edited'},$new_dir,{FILE => $new_virtual}) if($data->{'uselist'}->in_use($data->{'new_virtual'}));
 
    if(-d $new_physical)
    {
-    return error($config->{'errors'}->{'dircopy'});
+    return error($config->{'errors'}->{'dir_replace'},$new_dir);
    }
    elsif(not $data->{'cgi'}->param('confirmed'))
    {
@@ -627,8 +642,8 @@ sub exec_rename($$)
     $tpl->fillin("FILE",$virtual);
     $tpl->fillin("NEW_FILE",$new_virtual);
     $tpl->fillin("NEW_FILENAME",file_name($new_virtual));
-    $tpl->fillin("NEW_DIR",$dir);
-    $tpl->fillin("DIR",upper_path($virtual));
+    $tpl->fillin("NEW_DIR",$new_dir);
+    $tpl->fillin("DIR",$dir);
 
     $tpl->fillin("COMMAND","rename");
     $tpl->fillin("URL",equal_url($config->{'httproot'},$virtual));
@@ -641,8 +656,8 @@ sub exec_rename($$)
    }
   }
 
-  rename($physical,$new_physical) or return error($config->{'errors'}->{'rename_failed'},upper_path($virtual),{FILE => $virtual, NEW_FILE => $new_virtual});
-  return devedit_reload({command => 'show', file => $dir});
+  rename($physical,$new_physical) or return error($config->{'errors'}->{'rename_failed'},$dir,{FILE => $virtual, NEW_FILE => $new_virtual});
+  return devedit_reload({command => 'show', file => $new_dir});
  }
  else
  {
@@ -650,7 +665,7 @@ sub exec_rename($$)
   $tpl->read_file($config->{'templates'}->{'renamefile'});
 
   $tpl->fillin("FILE",$virtual);
-  $tpl->fillin("DIR",upper_path($virtual));
+  $tpl->fillin("DIR",$dir);
   $tpl->fillin("URL",equal_url($config->{'httproot'},$virtual));
   $tpl->fillin("SCRIPT",$script);
 
@@ -675,8 +690,10 @@ sub exec_remove($$)
  my ($data,$config) = @_;
  my $physical       = $data->{'physical'};
  my $virtual        = $data->{'virtual'};
+ my $dir            = upper_path($virtual);
 
  return error($config->{'errors'}->{'remove_root'},"/") if($virtual eq "/");
+ return error($config->{'errors'}->{'no_delete'},$dir)  unless(-w upper_path($physical));
 
  if(-d $physical)
  {
@@ -685,7 +702,7 @@ sub exec_remove($$)
   if($data->{'cgi'}->param('confirmed'))
   {
    rmtree($physical);
-   return devedit_reload({command => 'show', file => upper_path($virtual)});
+   return devedit_reload({command => 'show', file => $dir});
   }
   else
   {
@@ -693,7 +710,7 @@ sub exec_remove($$)
    $tpl->read_file($config->{'templates'}->{'confirm_rmdir'});
 
    $tpl->fillin("DIR",$virtual);
-   $tpl->fillin("UPPER_DIR",upper_path($virtual));
+   $tpl->fillin("UPPER_DIR",$dir);
    $tpl->fillin("URL",equal_url($config->{'httproot'},$virtual));
    $tpl->fillin("SCRIPT",$script);
 
@@ -707,12 +724,12 @@ sub exec_remove($$)
  {
   # Remove a file
 
-  return error($config->{'errors'}->{'in_use'},upper_path($virtual),{FILE => $virtual}) if($data->{'uselist'}->in_use($virtual));
+  return error($config->{'errors'}->{'in_use'},$dir,{FILE => $virtual}) if($data->{'uselist'}->in_use($virtual));
 
   if($data->{'cgi'}->param('confirmed'))
   {
-   unlink($physical) or return error($config->{'errors'}->{'delete_failed'},upper_path($virtual),{FILE => $virtual});
-   return devedit_reload({command => 'show', file => upper_path($virtual)});
+   unlink($physical) or return error($config->{'errors'}->{'delete_failed'},$dir,{FILE => $virtual});
+   return devedit_reload({command => 'show', file => $dir});
   }
   else
   {
@@ -720,7 +737,7 @@ sub exec_remove($$)
    $tpl->read_file($config->{'templates'}->{'confirm_rmfile'});
 
    $tpl->fillin("FILE",$virtual);
-   $tpl->fillin("DIR",upper_path($virtual));
+   $tpl->fillin("DIR",$dir);
    $tpl->fillin("URL",equal_url($config->{'httproot'},$virtual));
    $tpl->fillin("SCRIPT",$script);
 
@@ -747,65 +764,73 @@ sub exec_chprop($$)
  my $physical       = $data->{'physical'};
  my $virtual        = $data->{'virtual'};
  my $dir            = upper_path($virtual);
- my $cgi            = $data->{'cgi'};
- my $mode           = $cgi->param('mode');
- my $group          = $cgi->param('group');
 
- if($users)
+ return error($config->{'errors'}->{'no_users'},$dir,{FILE => $virtual})  unless($users);
+ return error($config->{'errors'}->{'chprop_root'},"/")                   if($virtual eq "/");
+ return error($config->{'errors'}->{'not_owner'},$dir,{FILE => $virtual}) unless(-o $physical);
+ return error($config->{'errors'}->{'in_use'},$dir,{FILE => $virtual})    if($data->{'uselist'}->in_use($virtual));
+
+ my $cgi   = $data->{'cgi'};
+ my $mode  = $cgi->param('mode');
+ my $group = $cgi->param('group');
+
+ if($mode || $group)
  {
-  if(-o $physical)
+  if($mode)
   {
-   if($mode || $group)
-   {
-    if($mode)
-    {
-     my $oct_mode = $mode;
-     $oct_mode    = "0".$oct_mode if(length($oct_mode) == 3);
-     $oct_mode    = oct($oct_mode);
+   # Change the mode
 
-     chmod($oct_mode,$physical);
-    }
+   chmod(oct($mode),$physical);
+  }
 
-    chgrp($group,$physical) if($group);
+  if($group)
+  {
+   # Change the group using the `chgrp` system command
 
-    return devedit_reload({command => 'show', file => $dir});
-   }
-   else
-   {
-    my @stat     = lstat($physical);
+   return error($config->{'errors'}->{'invalid_group'},$dir,{GROUP => encode_entities($group)}) unless($group =~ /^[a-z0-9_]+[a-z0-9_-]*$/i);
+   system("chgrp",$group,$physical);
+  }
 
-    my $mode     = $stat[2];
-    my $mode_oct = substr(sprintf("%04o",$mode),-4);
-    my $gid      = $stat[5];
-    my $group    = getgrgid($gid);
+  return devedit_reload({command => 'show', file => $dir});
+ }
+ else
+ {
+  # Display the form
 
-    my $tpl = new Template;
-    $tpl->read_file($config->{'templates'}->{'chprop'});
+  my @stat = stat($physical);
+  my $mode = $stat[2];
+  my $gid  = $stat[5];
 
-    $tpl->fillin("MODE_OCTAL",$mode_oct);
-    $tpl->fillin("MODE_STRING",mode_string($mode));
-    $tpl->fillin("GID",$gid);
-    $tpl->fillin("GROUP",$group);
+  my $tpl = new Template;
+  $tpl->read_file($config->{'templates'}->{'chprop'});
 
-    $tpl->fillin("FILE",$virtual);
-    $tpl->fillin("DIR",$dir);
-    $tpl->fillin("URL",equal_url($config->{'httproot'},$virtual));
-    $tpl->fillin("SCRIPT",$script);
+  # Insert file properties into the template
 
-    my $output = header(-type => "text/html");
-    $output   .= $tpl->get_template;
+  $tpl->fillin("MODE_OCTAL",substr(sprintf("%04o",$mode),-4));
+  $tpl->fillin("MODE_STRING",mode_string($mode));
+  $tpl->fillin("GID",$gid);
 
-    return \$output;
-   }
+  if(my $group = getgrgid($gid))
+  {
+   $tpl->fillin("GROUP",encode_entities($group));
+   $tpl->parse_if_block("group_detected",1);
   }
   else
   {
-   return error($config->{'errors'}->{'not_owner'},$dir,{FILE => $virtual});
+   $tpl->parse_if_block("group_detected",0);
   }
- }
- else
- {
-  return error($config->{'errors'}->{'no_users'},$dir,{FILE => $virtual});
+
+  # Insert other information
+
+  $tpl->fillin("FILE",$virtual);
+  $tpl->fillin("DIR",$dir);
+  $tpl->fillin("URL",equal_url($config->{'httproot'},$virtual));
+  $tpl->fillin("SCRIPT",$script);
+
+  my $output = header(-type => "text/html");
+  $output   .= $tpl->get_template;
+
+  return \$output;
  }
 }
 
@@ -823,11 +848,15 @@ sub exec_unlock($$)
 {
  my ($data,$config) = @_;
  my $virtual        = $data->{'virtual'};
+ my $uselist        = $data->{'uselist'};
+ my $dir            = upper_path($virtual);
+
+ return devedit_reload({command => 'show', file => $dir}) if($uselist->unused($virtual));
 
  if($data->{'cgi'}->param('confirmed'))
  {
-  file_unlock($data->{'uselist'},$virtual);
-  return devedit_reload({command => 'show', file => upper_path($virtual)});
+  file_unlock($uselist,$virtual);
+  return devedit_reload({command => 'show', file => $dir});
  }
  else
  {
@@ -835,7 +864,7 @@ sub exec_unlock($$)
   $tpl->read_file($config->{'templates'}->{'confirm_unlock'});
 
   $tpl->fillin("FILE",$virtual);
-  $tpl->fillin("DIR",upper_path($virtual));
+  $tpl->fillin("DIR",$dir);
   $tpl->fillin("URL",equal_url($config->{'httproot'},$virtual));
   $tpl->fillin("SCRIPT",$script);
 
@@ -870,21 +899,21 @@ sub exec_about($$)
 
  # Some path information
 
- $tpl->fillin("SCRIPT_PHYS",$ENV{'SCRIPT_FILENAME'});
- $tpl->fillin("CONFIG_PATH",$data->{'configfile'});
- $tpl->fillin("FILE_ROOT",$config->{'fileroot'});
- $tpl->fillin("HTTP_ROOT",$config->{'httproot'});
+ $tpl->fillin("SCRIPT_PHYS",encode_entities($ENV{'SCRIPT_FILENAME'}));
+ $tpl->fillin("CONFIG_PATH",encode_entities($data->{'configfile'}));
+ $tpl->fillin("FILE_ROOT",  encode_entities($config->{'fileroot'}));
+ $tpl->fillin("HTTP_ROOT",  encode_entities($config->{'httproot'}));
 
  # Perl
 
- $tpl->fillin("PERL_PROG",$^X);
- $tpl->fillin("PERL_VER",sprintf("%vd",$^V));
+ $tpl->fillin("PERL_PROG",encode_entities($^X));
+ $tpl->fillin("PERL_VER", sprintf("%vd",$^V));
 
  # Information about the server
 
- $tpl->fillin("HTTPD",$ENV{'SERVER_SOFTWARE'});
- $tpl->fillin("OS",$^O);
- $tpl->fillin("TIME",strftime($config->{'timeformat'},localtime));
+ $tpl->fillin("HTTPD",encode_entities($ENV{'SERVER_SOFTWARE'}));
+ $tpl->fillin("OS",   encode_entities($^O));
+ $tpl->fillin("TIME", encode_entities(strftime($config->{'timeformat'},localtime)));
 
  # Process information
 
@@ -897,17 +926,41 @@ sub exec_about($$)
   # Dev-Editor is running on a system which allows users and groups
   # So we display the user and the group of our process
 
+  my $uid = POSIX::getuid;
+  my $gid = POSIX::getgid;
+
   $tpl->parse_if_block("users",1);
 
   # ID's of user and group
 
-  $tpl->fillin("UID",$<);
-  $tpl->fillin("GID",$();
+  $tpl->fillin("UID",$uid);
+  $tpl->fillin("GID",$gid);
 
   # Names of user and group
 
-  $tpl->fillin("USER",getpwuid($<));
-  $tpl->fillin("GROUP",getgrgid($());
+  if(my $user = getpwuid($uid))
+  {
+   $tpl->fillin("USER",encode_entities($user));
+   $tpl->parse_if_block("user_detected",1);
+  }
+  else
+  {
+   $tpl->parse_if_block("user_detected",0);
+  }
+
+  if(my $group = getgrgid($gid))
+  {
+   $tpl->fillin("GROUP",encode_entities($group));
+   $tpl->parse_if_block("group_detected",1);
+  }
+  else
+  {
+   $tpl->parse_if_block("group_detected",0);
+  }
+
+  # Process umask
+
+  $tpl->fillin("UMASK",sprintf("%04o",umask));
  }
  else
  {