#!/usr/bin/perl -wT

# F*EX CGI for upload
#
# Author: Ulli Horlacher <framstag@rus.uni-stuttgart.de>
#
# Contribs:
#	Sebastian Zaiser <szcode@arcor.de> (upload status)
#

BEGIN { ($ENV{PERLINIT}||'') =~ /(.+)/s and eval $1 }

use utf8;
use Encode;
use Fcntl 		qw':flock :seek :mode';
use IO::Handle;
use Digest::MD5		qw'md5_hex';
use Cwd			qw'abs_path';

# add fex lib
(our $FEXLIB) = $ENV{FEXLIB} =~ /(.+)/;

$| = 1;

our $debug;
our $ndata = 0;
our $error = 'F*EX upload ERROR';
our $head = "$ENV{SERVER_NAME} F*EX upload";
our $autodelete = 'YES';
our $locale;

# import from fex.ph
our (@locales,@throttle,$bcc,$keep_max,$nomail,$nostore,$overwrite);
our (@local_domains,@local_rdomains,@local_hosts,@local_rhosts,);
our (@registration_hosts,@demo,@file_link_dirs);

# import from fex.pp
our ($FEXHOME);
our ($spooldir,$durl,$tmpdir,@logdir,$logdir,$docdir,$hostname,$admin,$fra);
our ($keep_default,$recipient_quota,$sender_quota,$fex_yourself);
our ($sendmail,$mdomain,$fop_auth,$mail_auth,$faillog,$amdl);
our ($dkeydir,$ukeydir,$akeydir,$skeydir,$gkeydir,$xkeydir);
our ($MB,$DS);
our $RB;		# read POST bytes (total)
our $akey = '';
our $dkey = '';
our $skey = '';
our $gkey = '';

our $seek = 0;		# already sent bytes (from previous upload)
our $filesize = 0;	# total file size
our $fpsize = 0;	# file part size (MIME-part)

my $data;
my $boundary;
my $rid = '';		# real ID
my @header;		# HTTP entity header
my $fileid;		# file ID
my $captive;
my $muser;		# main user fur sub or group user
my %specific;		# upload specific KEEP and AUTODELETE parameters

# load common code, local config: $FEXLIB/fex.ph
require "$FEXLIB/fex.pp";

# load fup local config
our ($info_1,$info_2,$info_login);

$locale = $ENV{LOCALE} || 'english';
foreach (
  "/var/lib/fex/locale/$locale/lib/fup.pl",
  "$FEXLIB/fup.pl",
) {
  if (-f) {
    require;
    last;
  }
}

&check_camel unless $sid;

chdir $spooldir or http_die("$spooldir - $!\n");

my $log = 'fup.log';

my $http_client = $ENV{HTTP_USER_AGENT} || '';
my $cl = $ENV{X_CONTENT_LENGTH} || $ENV{CONTENT_LENGTH} || 0;

$fra .= '/'.$ENV{HTTP_X_FORWARDED_FOR} if $ENV{HTTP_X_FORWARDED_FOR};

$from = $to = $id = $file = $fkey = $comment = $command = $bwlimit = '';
$filename = $okey = $addto = $replyto = $submit = '';
@to = ();
$data = '';
$locale = untaint($ENV{LOCALE}||'');

my $ra = $ENV{REMOTE_ADDR}||0;
if (@upload_hosts and not ipin($ra,@upload_hosts)) {
  http_die(
    "Uploads from your host ($ra) are not allowed.",
    "Contact $ENV{SERVER_ADMIN} for details."
  );
}

&check_maint;

&parse_request; # showstatus will not come back!

if ($addto) {
  my %to;
  foreach $to (@to) { $to{$to} = 1 }
  push @to,$addto unless $to{$addto};
  # user has submitted with [select from your address book] ?
  # if ($submit and @to == 1) { $addto = '' }
}

$to = join(',',@to);

if ($from eq $to and $fex_yourself =~ /^no|0$/i) {
  http_die("fexing to yourself is not allowed");
}

$uid = randstring(8) unless $uid; # upload ID

# user requests for forgotten ID
$id_forgotten = $id if $id =~ /^"?\?"?$/;
if ($from and $id_forgotten and $mail_authid and not ($fop_auth or $nomail)) {
  &check_status($from);
  &id_forgotten;
  exit;
}

# public recipients? (needs no auth-ID for sender)
if ($to and $id and $id eq 'PUBLIC' and @public_recipients) {

  unless ($from) {
    http_die("missing sender e-mail address");
  }
  # must use $param{FROM} for checking because $from is expanded with $mdomain
  unless (checkaddress(despace($param{FROM}))) {
    http_die("<code>$param{FROM}</code> is not a valid e-mail address");
  }
  foreach my $to (@to) {
    unless (grep /^\Q$to\E$/i,@public_recipients) {
      http_die("<code>$to</code> is not a valid recipient");
    }
  }
  $restricted = $public = $rid = $id;
}

# anonymous upload from enabled IP?
if ($from =~ /^anonymous@/ and
    @anonymous_upload and ipin($ra,@anonymous_upload)) {
  $id = $rid = $anonymous = 'anonymous';
  if ($to =~ /^anonymous/) {
    @to = ($to);
    $autodelete{$to} = $autodelete = $specific{'autodelete'}||'NO';
  }
  $nomail = $anonymous;
}

$comment = 'NOMAIL' if $nomail and not $comment;

# one time token
if ($okey) {
  $to = "@to" or http_die("no recipient specified");
  $from = readlink "$to/\@OKEY/$okey"
    or http_die("no upload key \"<code>$okey</code>\" - ".
                "request another one from <code>$to</code>");
  $from = untaint($from);
}

&check_status($from) if $from;

# look for regular sender ID
if ($id and $from and not ($public or $anonymous or $okey)) {
  if (open $from,'<',"$from/\@") {
    # chomp($rid = <$from> || '');
    $rid = getline($from);
    close $from;
    $rid = sidhash($rid,$id);
    # set time mark for successfull access
    if ($id eq $rid) {
      my $time = untaint(time);
      utime $time,$time,$from;
    }
  } else {
    my $error = $!;
    # if recipient (to) is specified, we have to look for subusers later, too
    unless (@to) {
      fuplog("ERROR: $spooldir/$from/\@ $error");
      debuglog("cannot open $spooldir/$from/\@ : $error");
      faillog("user $from, id $id");
      http_die("wrong user or auth-ID");
    }
  }
}

# check regular ID
if ($from and $id and not ($gkey or $skey or $public or $okey)) {
  if ($rid and $rid eq $id) {
    # set akey link for HTTP sessions
    # (need original id for consistant non-moving akey)
    if (-d $akeydir and open $idf,'<',"$from/@" and my $id = getline($idf)) {
      # akey for webbrowser or fexsend special
      if (not $sid or ($from eq $to and ($comment eq '*')) or $command) {
        $akey = untaint(md5_hex("$from:$id"));
        mksymlink("$akeydir/$akey","../$from");
      }
    }
    $captive = -e "$from/\@CAPTIVE";
  } else {
    fuplog("ERROR: wrong auth-ID for $from");
    debuglog("id sent by user $from=$id, real id=$rid");
    faillog("user $from, id $id");
    http_die("Wrong user or auth-ID");
  }
}

# optional $auth_hook() in fup.pl
if ($auth_hook and ($akey or $skey or $gkey) and $from and -d $from) {
  &$auth_hook;
}

# forward a copy of a file to another recipient
if ($akey and $dkey and $command eq 'FORWARD') {
  my $file = untaint(readlink "$dkeydir/$dkey"||'');
  http_die("unknown dkey <code>$dkey></code>") unless $file;
  $file =~ s:^\.\./::;
  forward($file);
  exit;
}

# modify file parameter
if ($akey and $dkey and $command eq 'MODIFY') {
  my $file = untaint(readlink "$dkeydir/$dkey"||'');
  http_die("unknown dkey <code>$dkey</code>") unless $file;
  $file =~ s:^\.\./::;
  modify($file);
  exit;
}

# copy file from incoming to outgoing spool
if ($akey and $dkey and $command eq 'COPY') {
  unless ($file = readlink "$dkeydir/$dkey") {
    http_die("No such file with DKEY=$dkey");
  }
  if ($file =~ m:../(.+)/(.+)/(.+):) {
    ($to,$from,$file) = ($1,$2,$3);
  } else {
    http_die("Bad DKEY $dkey -> $file");
  }
  unless (-f "$to/$from/$file/data") {
    http_die("File not found");
  }
  if (-e "$to/$to/$file/data") {
    http_die("File $file already exists in your outgoing spool")
      if (readlink("$to/$to/$file/id")||$to) ne
         (readlink("$to/$from/$file/id")||$from);
  } else {
    mkdirp("$to/$to/$file");
    link "$to/$from/$file/data","$to/$to/$file/data"
      or http_die("cannot link to $to/$to/$file/data - $!\n");
    copy("$to/$from/$file/filename","$to/$to/$file/filename");
    copy("$to/$from/$file/id","$to/$to/$file/id");
    open $file,'>',"$to/$to/$file/notify";
    close $file;
    open $file,'>',"$to/$to/$file/download";
    print {$file} "$to\n";
    close $file;
    $dkey = randstring(8);
    unlink "$to/$to/$file/dkey","$to/$to/$file/keep","$dkeydir/$dkey";
    symlink "../$to/$to/$file","$dkeydir/$dkey";
    symlink $dkey,"$to/$to/$file/dkey";
  }
  nvt_print(
    "HTTP/1.1 302 Found",
    "Location: $ENV{PROTO}://$ENV{HTTP_HOST}/rup?akey=$akey&oto=$to&file=$file",
    'Content-Length: 0',
    ''
  );
  &reexec;
}

# delete file without download
if ($akey and $dkey and $command eq 'DELETE') {
  $del = untaint(readlink "$dkeydir/$dkey"||'');
  http_die("unknown dkey <code>$dkey</code>") unless $del;
  $del =~ s:^\.\./::;
  $filename = filename($del);
  if (unlink("$del/data") or unlink("$del/upload")) {
    if (open F,'>',"$del/error") {
      printf F "%s has been deleted by %s at %s\n",
               $filename,$ENV{REMOTE_ADDR},isodate(time);
      close F;
    }
    # http_header('200 OK');
    # print html_header($head);
    # print "<h3>$filename deleted</h3>\n";
    nvt_print(
      "HTTP/1.1 302 Found",
      "Location: $ENV{PROTO}://$ENV{HTTP_HOST}/fup?akey=$akey&command=LISTRECEIVED",
      'Content-Length: 0',
      ""
    );
    &reexec;
  } else {
    my $s = $!;
    http_header('404 Not Found');
    print html_header($head);
    print "<h3>$filename not deleted ($s)</h3>\n";
    print "<a href=\"/fup?akey=$akey&command=LISTRECEIVED\">continue</a>\n" if $akey;
    print "</body></html>\n";
  }
  exit;
}

# special commands
if (($from and $id and $rid eq $id or $gkey or $skey) and $command) {

  if ($command eq 'CHECKQUOTA') {
    http_die("illegal command \"$command\"") if $public or $anonymous;
    nvt_print('HTTP/1.1 204 OK');
    # nvt_print("X-SID: $ENV{SID}") if $ENV{SID};
    ($quota,$du) = check_sender_quota($muser||$from);
    nvt_print("X-Sender-Quota: $quota $du")    if $quota;
    ($quota,$du) = check_recipient_quota($muser||$from);
    nvt_print("X-Recipient-Quota: $quota $du") if $quota;
    nvt_print('');
    exit;
  }

  if ($command eq 'LISTSETTINGS') {
    http_die("illegal command \"$command\"") if $public or $anonymous;
    nvt_print('HTTP/1.1 204 OK');
    # nvt_print("X-SID: $ENV{SID}") if $ENV{SID};
    ($quota,$du) = check_sender_quota($muser||$from);
    nvt_print("X-Sender-Quota: $quota $du")    if $quota;
    ($quota,$du) = check_recipient_quota($muser||$from);
    nvt_print("X-Recipient-Quota: $quota $du") if $quota;
    $autodelete = lc(readlink "$from/\@AUTODELETE" || $autodelete);
    nvt_print("X-Autodelete: $autodelete");
    $keep = readlink "$from/\@KEEP" || $keep;
    nvt_print("X-Default-Keep: $keep");
    $locale = readlink "$from/\@LOCALE" || $default_locale || 'english';
    nvt_print("X-Default-Locale: $locale");
    $mime = -e "$from/\@MIME" ? 'yes' : 'no';
    nvt_print("X-MIME: $mime");
    nvt_print('');
    exit;
  }

  if ($command eq 'RENOTIFY') {
    http_die("illegal command \"$command\"") if $public or $anonymous;
    my $nfile = '';
    if ($dkey) {
      # resend notification e-mail
      $file = readlink("$dkeydir/$dkey")
        or html_error($error,"illegal DKEY $dkey");
      $file =~ s:^../::;
      $file = untaint($file);
      unlink "$file/download"; # re-allow download from any ip address
      notify_locale($dkey,'new');
      http_header(
        '200 OK',
        "X-Notify: $file",
      );
      $nfile = $file;
    } else {
      http_header('200 OK');
    }
    print html_header($head);
    # list sent files
    print "<h3>Files from $from, ",
          "click on the file name to resend a notification e-mail:</h3>\n",
          "<pre>\n";
    foreach $file (glob "*/$from/*") {
      next if $file =~ m:/STDFEX$:;
      next if $file =~ m:(.+?)/: and -l $1;
      $size = -s "$file/data";
      next unless $size;
      $size = int($size/$MB+0.5);
      $filename = $comment = '';
      my $rto = $file;
      $rto =~ s:/.*::;
      if ($dkey = readlink "$file/dkey") {
        if ($rto ne $to) {
          $to = $rto;
          print "\nto $to :\n";
        }
        if (open $file,'<',"$file/filename") {
          $filename = <$file>;
          close $file;
        }
        if ($filename and length $filename) {
          $filename = html_quote($filename);
        } else {
          $filename = '???';
        }
        if (open $file,'<',"$file/comment") {
          $comment = untaint(html_quote(getline($file)));
          close $file;
        }
        my $rkeep = untaint(readlink "$file/keep"||$keep_default)
                    - int((time-mtime("$file/filename"))/$DS);
        if ($comment =~ /NOMAIL/ or
           (readlink "$to/\@NOTIFICATION"||'') =~ /^no/i) {
          printf "%8s MB (%2s d) %s/%s/%s\n",
                 $size,
                 $rkeep,
                 $durl,
                 $dkey,
                 urlencode(basename($file));
        } else {
          printf "%8s MB (%2s d) <a href=\"%s\">%s</a>%s %s\n",
                 $size,
                 $rkeep,
                 untaint("/fup?akey=$akey&dkey=$dkey&command=RENOTIFY"),
                 $filename,
                 $comment ? qq' "$comment"' : '',
                 $file eq $nfile ?
                   " &rarr; notification e-mail has been resent" :
                   "";
        }
      }
    }
    pq(qq(
      '</pre>'
      '<p><a href="/foc?akey=$akey">back to F*EX operation control</a>'
      '</body></html>'
    ));
    exit;
  }

  if ($command =~ /^LIST(RECEIVED)?$/) {
    http_die("illegal command \"$command\"") if $public or $anonymous;
    # list sent files
    if ($to and $param{'TO'} eq '*') {
      http_header('200 OK');
      print html_header($head);
#            "(Format: [size] [rest keep time] [filename] [comment])<p>\n",
      print "<h3>Files from $from:</h3>\n",
            "<pre>\n";
      foreach $file (glob "*/$from/*") {
        next if $file =~ m:/STDFEX$:;
        next if $file =~ m:(.+?)/: and -l $1;
        $size = -s "$file/data";
        next unless $size;
        $size = int($size/$MB+0.5);
        $filename = $comment = '';
        my $rto = $file;
        $rto =~ s:/.*::;
        if ($dkey = readlink "$file/dkey") {
        # die $file if -s "$file/data" and $file =~ /^$from/;
          if ($rto ne $to) {
            $to = $rto;
            print "\nto $to :\n";
          }
          if (open $file,'<',"$file/filename") {
            $filename = <$file>;
            close $file;
          }
          if ($filename and length $filename) {
            $filename = html_quote($filename);
          } else {
            $filename = '???';
          }
          if (open $file,'<',"$file/comment") {
            $comment = untaint(html_quote(getline($file)));
            close $file;
          }
          my $rkeep = untaint(readlink "$file/keep"||$keep_default)
                      - int((time-mtime("$file/filename"))/$DS);
          printf "%8s MB (%2s d) %s <a href=\"%s\">%s</a>%s\n",
                 $size,
                 $rkeep,
                 stat("$file/download")?'+':'-',
                 untaint("/fup?akey=$akey&dkey=$dkey&command=FORWARD"),
                 $filename,
                 $comment?qq( "$comment"):'';
        }
      }
      pq(qq(
        '</pre>'
        '<p><a href="javascript:history.back()">back to F*EX operation control</a>'
        '</body></html>'
      ));
    }
    # list received files
    else {
      $to = $from;
      http_header('200 OK');
      print html_header($head);
#            "(Format: [size] [rest keep time] [URL] [comment])<p>\n",
      print "<h3>Files for $to (*):</h3>\n",
            "<pre>\n";
      foreach $from (glob "$to/*") {
        next if $from =~ /[A-Z]/;
        $from =~ s:.*/::;
        $url = '';
        foreach $file (glob "$to/$from/*") {
          next if $file =~ /\/STDFEX$/;
          $filename = $comment = '';
          $size = -s "$file/data";
          next unless $size;
          $size = int($size/$MB+0.5);
          if ($dkey = readlink "$file/dkey") {
            print "\nfrom $from :\n" unless $url;
            $file =~ m:.*/(.+):;
            $url = "$durl/$dkey/$1";
            unless (-l "$dkeydir/$dkey") {
              symlink untaint("../$file"),untaint("$dkeydir/$dkey");
            }
            if (open $file,'<',"$file/filename") {
              $filename = <$file>;
              close $file;
            }
            if ($filename and length $filename) {
              $filename = html_quote($filename);
            } else {
              $filename = '???';
            }
            if (open $file,'<',"$file/comment") {
              $comment = untaint(html_quote(getline($file)));
              $comment = ' "'.$comment.'"';
              close $file;
            }
            my $rkeep = untaint(readlink "$file/keep"||$keep_default)
                        - int((time-mtime("$file/filename"))/$DS);
            printf "[<a href=\"/fup?akey=%s&dkey=%s&command=DELETE\">delete</a>] ",
                   $akey,$dkey;
            printf "[<a href=\"/fup?akey=%s&dkey=%s&command=COPY\">forward</a>] ",
                   $akey,$dkey;
            printf "%8s MB (%2s d) <a href=\"%s\">%s</a>%s\n",
                   $size,$rkeep,$url,$filename,$comment;
          }
        }
      }
      pq(qq(
        '</pre>'
        '(*) Files for other e-mail addresses you own will not be listed here!<p>'
        '<a href="/foc?akey=$akey">back to F*EX operation control</a>'
        '</body></html>'
      ));
    }
    exit;
  }

  if ($command eq 'LISTSENT') {
    http_die("illegal command \"$command\"") if $public or $anonymous;
    # show download URLs
    http_header('200 OK');
    print html_header($head);
    print "<h2>Download URLs of files you have sent\n";
    foreach $to (glob "*/$from") {
      if (@files = glob "$to/*/data") {
        $to =~ s:/.*::;
        print "<h3>to <code>$to</code> :</h3>\n";
        print "<pre>\n";
        foreach $file (@files) {
          $file =~ s:/data::;
          next if $file =~ /\/STDFEX$/;
          $dkey = readlink "$file/dkey" or next;
          $file =~ s:.*/::;
          print "$ENV{PROTO}://$ENV{HTTP_HOST}/fop/$dkey/$file\n";
        }
        print "</pre>\n";
      }
    }
    pq(qq(
      '</pre>'
      '<p><a href="javascript:history.back()">back to F*EX operation control</a>'
      '</body></html>'
    ));
    exit;
  }

  if ($command eq 'FOPLOG') {
    http_die("illegal command \"$command\"") if $public or $anonymous;
    if (open my $log,"$logdir/fop.log") {
      http_header('200 OK');
      while (<$log>) {
        next if /\/STDFEX\s/;
        if (s:^([^/]+)/$from/:$1 :) {
          if (s:(\d+)/(\d+)$:$1: and $1 and $1 == $2) {
            s/ \[[\d_]+\]//;
            print;
          }
        }
      }
    }
    exit;
  }

  if ($command eq 'RECEIVEDLOG') {
    http_die("illegal command \"$command\"") if $public or $anonymous;
    if (open my $log,"$logdir/fup.log") {
      http_header('200 OK');
      while (<$log>) {
        next if /\sSTDFEX\s/;
        if (/\d+$/) {
          my @F = split;
          if ($F[5] eq $to) {
            s/ \[[\d_]+\]//;
            print;
          }
        }
      }
    }
    exit;
  }

  if ($command eq 'SENDLOG') {
    http_die("illegal command \"$command\"") if $public or $anonymous;
    if (open my $log,"$logdir/fup.log") {
      http_header('200 OK');
      while (<$log>) {
        next if /\sSTDFEX\s/;
        if (/(\S+\@\S+)/ and $1 eq $from) {
          s/ \[[\d_]+\]//;
          print;
        }
      }
    }
    exit;
  }

  if (@to and $command eq 'CHECKRECIPIENT') {
    http_die("illegal command \"$command\"") if $public or $anonymous;
    check_rr($from,@to);
    nvt_print('HTTP/1.1 204 OK');
    nvt_print("X-SID: $sid") if $sid;
    foreach my $to (@group?@group:@to) {
      # my $options = sprintf "(autodelete=%s,keep=%s,locale=%s)",
      # readlink "$to/\@LOCALE"||$locale||$locale{$to}||$default_locale;
      # my $options = sprintf "(autodelete=%s,keep=%s,locale=%s,notification=%s)",
      my $options = sprintf "(autodelete=%s,keep=%s,locale=%s)",
        $autodelete{$to}||$autodelete,
        $keep{$to}||$keep_default,
        readlink("$to/\@LOCALE")||$locale{$to}||$default_locale;
        # readlink("$to/\@NOTIFICATION")||'full';
      nvt_print("X-Recipient: $to $options");
    }
    nvt_print('');
    # control back to fexsrv for further HTTP handling
    &reexec;
  }

  if ($file and @to and $command eq 'DELETE') {
    http_die("illegal command \"$command\"") if $public or $anonymous;
    foreach (@group?@group:@to) {
      my $to = $_;
      $to =~ s/:\w+=.*//; # remove options from address
      $del = "$to/$from/$fkey";
      # swap to and from for special senders, see fup storage swap!
      $del = "$from/$to/$fkey" if $from =~ /^(fexmail|anonymous)/;

      $del =~ s:^/+::;
      if ($del =~ /\/\./) {
        http_die("illegal parameter <code>$del</code>");
      }
      $del = untaint($del);

      if (unlink("$del/data") or unlink("$del/upload")) {
        if (open F,'>',"$del/error") {
          print F "$file has been deleted by $from\n";
          close F;
        }
        http_header('200 OK',"X-File: $del");
        print html_header($head);
        print "<h3>$file deleted</h3>\n";
      } else {
        http_header("404 Not Found");
        print html_header($head);
        print "<h3>$file not deleted</h3>\n";
      }
      if ($akey) {
        printf "<a href=\"/fup?akey=%s&to=%s&command=LISTRECEIVED\">continue</a>\n",
               $akey,$to;
      }
      print "</body></html>\n";
    }
    exit;
  }

}

# ip restrictions
if ($from and $id and $rid eq $id and open my $ipr,"$from/\@UPLOAD_HOSTS") {
  my @hosts;
  while (<$ipr>) {
    chomp;
    s/#.*//;
    push @hosts,$_ if /\w/;
  }
  close $ipr;
  unless (@hosts and ipin($ra,@hosts)) {
    http_die("<code>$from</code> is not allowed to upload from IP $ra");
  }
}

# quotas
if ($from and $id and $rid eq $id and @to and not $flink and not $seek) {
  my ($quota,$du);

  # check sender quota
  ($quota,$du) = check_sender_quota($muser||$from);
  if ($quota and $du+$cl/$MB > $quota) {
    http_die("you are overquota");
  }

  # check recipient quota
  foreach my $to (@to) {
    ($quota,$du) = check_recipient_quota($to);
    if ($quota and $du+$cl/$MB > $quota) {
      http_die("$to cannot receive files: is overquota");
    }
  }

}

# check recipients restriction
if ($id and $id eq $rid and $from and @to and not $public) {
  check_rr($from,@to);
}

# on secure mode "fop authorization" also check if recipient(s) exists
# (= has a F*EX ID)
if (not $addto and $fop_auth and $id and $id eq $rid and $from and @to) {
  my ($to_reg,$idf,$subuser);
  foreach my $to (my @loop = @to) {
    $to =~ s/:\w+=.*//; # remove options from address
    $to_reg = 0;
    # full user?
    if (open $idf,'<',"$to/@") {
      $to_reg = getline($idf);
      close $idf;
    }
    # sub user?
    elsif (open $idf,'<',"$from/\@SUBUSER") {
      while (<$idf>) {
        s/#.*//;
        next unless /:/;
        chomp;
        ($subuser) = split ':';
        if ($subuser eq $to or $subuser eq '*@*'
            or $subuser =~ /^\*\@(.+)/ and $to =~ /\@\Q$1\E$/i
            or $subuser =~ /(.+)\@\*$/ and $to =~ /^\Q$1\E\@/i) {
          $to_reg = $_;
          last;
        }
      }
      close $idf;
    }
    unless ($to_reg) {
      http_die("recipient <code>$to</code> is not a registered F*EX full or sub user");
    }
  }
}

$to = join(',',@to);

if ($to =~ /^@(.+)/) {
  if ($nomail) {
    http_die("server runs in NOMAIL mode - groups ($to) are not allowed");
  }
  my $gf = "$from/\@GROUP/$1";
  if (open $gf,'<',$gf) {
    while (<$gf>) {
      s/#.*//;
      push @group,$1 if /(.+@.+):/;
    }
  }
  close $gf;
  $group = $to;
}

if ($redirect) {
  nvt_print(
    "HTTP/1.1 302 Found",
    "Location: $ENV{PROTO}://$ENV{HTTP_HOST}/$redirect?akey=$akey",
    'Content-Length: 0',
    ""
  );
  &reexec;
}

if ($from and $id and $id eq $rid and $faillog) {
  unlink $faillog;
}

# display HTML form and request user data
unless ($file) {

  if ($test) { $cgi = $test }
  else       { $cgi = $ENV{SCRIPT_NAME} }
  $cgi = 'fup';

  # delete old cookies on logout referer
  my @cookies;
  if ($logout and my $cookie = $ENV{HTTP_COOKIE}) {
    while ($cookie =~ s/(\w+key)=\w+//) {
      push @cookies,"Set-Cookie: $1=x; path=/; expires=Thu, 01 Jan 1970 00:00:00 GMT";
    }
  }

  if (($akey or $skey or $gkey) and $from and -d $from) {
    # save default locale for this user
    if (not $locale and ($ENV{HTTP_COOKIE}||'') =~ /\blocale=(\w+)/) {
      $locale = $1;
    }
    mksymlink("$from/\@LOCALE",$locale) if $locale;
  }

  http_header('200 OK',@cookies);
  # print html_header($head,'<img src="/fex_small.gif">');
  print html_header($head);

  if ($http_client =~ /(Konqueror|w3m)/) {
    pq(qq(
      '<p><hr><p>'
      '<center>'
      '<h3>Your client seems to be "$1" which is incompatible with F*EX and will probably not work!</h3>'
      'We recommend firefox.'
      '</center>'
      '<p><hr><p>'
    ));
  }

  # default "fex yourself" setting?
  if ($from and $id and $id eq $rid and not $addto
      and not ($gkey or $skey or $okey or $public or $anonymous)
      and (not @to or "@to" eq $from)
      and -f "$from/\@FEXYOURSELF")
  {
    @to = ($from);
    $nomail = 'fexyourself';
  }

  # ask for recipient address(es)
  elsif ($from and $id and $id eq $rid and ($addto or not $submit or not @to)
         and not ($gkey or $skey or $okey or $public or $anonymous))
  {
    present_locales('/fup');

    # print "[$addto] [$submit] [@to]<p>\n";

    @ab = ("<option></option>");

    # select menu from server address book
    if (open my $AB,'<',"$from/\@ADDRESS_BOOK") {
      while (<$AB>) {
        s/#.*//g;
        if (/(\S+)[=\s]+(\S+@[\w.-]+\S*)/) {
          $_ = "$1 &lt;$2>";
          s/,.*/,.../g;
          s/:.*/>/;
          push @ab,"<option>$_</option>";
        }
      }
      close $AB;
    }

    unless (@to) {
      unless ($nomail) {
        foreach (glob "$from/\@GROUP/*") {
          if (-f and not -l) {
            s:.*/::;
            push @ab,"<option>\@$_</option>" unless /~$/;
          }
        }
      }
    }

    my $ab64 = b64("from=$from&id=$id");
#     '<form class="uploadform" name="upload"'
    pq(qq(
      '<form name="upload"'
      '      action="/fup"'
      '      method="post"'
      '      accept-charset="UTF-8"'
      '      enctype="multipart/form-data">'
      '  <input type="hidden" name="from" value="$from">'
      '  <input type="hidden" name="id"   value="$id">'
      '  <table border="1">'
      '    <tr><td>sender:   <td><a href="/foc">$from</a></tr>'
      '    <tr title="e-mail address or alias"><td>recipient(s):'
      '        <td><input type="text" name="to" size="96" value="$to"><br>'
    ));
    if (grep /@/,@ab) {
      pq(qq(
        '        or select from your address book:'
        '        <select name="addto" size="1">@ab</select>'
        '        and'
        '        <input type="submit" name="addsubmit" value="add to recipients list">'
      ));
    }
    pq(qq(
      '    </tr>'
      '  </table>'
      '  <p>'
    ));
    my $rr = "$from/\@ALLOWED_RECIPIENTS";
    if (-s $rr and open $rr,'<',$rr) {
      pq(qq(
        'You are a restricted user and may only fex to these recipients:<p>'
        '<pre>'
      ));
      while (<$rr>) {
        chomp;
        s/#.*//;
        s/\s//g;
        next unless $_;
        if (/^\@LOCAL_RDOMAINS/) {
          foreach my $rd (@local_rdomains) {
            print "*\@$rd\n";
          }
        } elsif (/^\@LOCAL_USERS/) {
          foreach (glob "*/@") {
            s:/.::;
            print "$_\n";
          }
        } else {
          print "$_\n";
        }
      }
      print "</pre><p>\n";
      close $rr;
    }
    print qq'  <input type="submit" name="submit" value="check recipient(s) and continue">';
    if ($fex_yourself =~ /^yes|1/i) {
      print qq' or <input type="submit" name="fexyourself" value="fex yourself">'
    }
    print "\n</form>\n<p>\n";
    if ($akey and -f "$from/\@" and not $captive ) {
      pq(qq(
        '<a href="/foc?akey=$akey">user config & operation control</a>'
      ));
    }

    if ($from eq $admin ) {
      pq(qq(
        '<p>'
        '<a href="/fac">server config & admin control</a>'
      ));
    }

    if (0 and -f "$docdir/FIX.jar") {
      print "<p>\n";
      if    ($public) { print "<a href=\"/fix?from=$from&id=$public&to=$to\">" }
      elsif ($skey)   { print "<a href=\"/fix?skey=$skey&to=$to\">" }
      elsif ($gkey)   { print "<a href=\"/fix?gkey=$gkey&to=$to\">" }
      else            { print "<a href=\"/fix?akey=$akey\">" }
      print "Alternate Java client</a> (for files > 2 GB or sending of more than one file)\n";
    }
    print &logout;
    pq(qq(
      '<p><hr><p>'
      '<b>'
      'Warning: the recipient must not be a mailing list,'
      'because after download the file will be no more available!'
      '</b><br>'
      'Contact <a href="mailto:$ENV{SERVER_ADMIN}">fexmaster</a> if you want to fex to a mailing list,'
      'he can allow multiple downloads for specific addresses.'
      '<p>'
      'Use a <a href="/tools.html">F*EX client</a> if you want to send more than one file or resume an interrupted upload.'
      '</body></html>'
      '<p>'
   ));
    print $info_1;
    exit;
  }

  # ask for filename
  if ($from and ($id or $okey)) {
    $to = $group if $group;
    present_locales($ENV{REQUEST_URI}) if $skey or $gkey or $okey;
#      "        '$ENV{PROTO}://$ENV{HTTP_HOST}/$cgi?showstatus=$uid',"
    pq(qq(
      '<script type="text/javascript">'
      '  function showstatus() {'
      '    var file = document.forms["upload"].elements["file"].value;'
      '    if (file == "") return false;'
      '    window.open('
      "      '/$cgi?showstatus=$uid',"
      "      'fup_status',"
      "      'width=700,height=500'"
      '    );'
      '    return true;'
      '  }'
      ''
      '  function checkupload() {'
      '    var file  = document.forms["upload"].elements["file"].value;'
      '    if (file == "") { alert("No file selected"); }'
      '  }'
      ''
      '  function reportsize() {'
      '    var form = document.forms["upload"];'
      '    var filesize = form.file.files[0].size;'
      '    // alert(filesize + " bytes");'
      '    form.elements["filesize"].value = filesize;'
      '    filesize = filesize.toString();'
      '    filesize = filesize.replace(/(\\d)(?=(\\d\\d\\d)+(?!\\d))/g,"\$1,");'
      '    document.getElementById("filesize").innerHTML = filesize + " bytes";'
      '  }'
      '</script>'
    ));
    pq(qq(
      '<form name="upload"'
      '      action="/fup"'
      '      method="post"'
      '      accept-charset="UTF-8"'
      '      enctype="multipart/form-data"'
      '      onsubmit="return showstatus();">'
      '  <input type="hidden" name="uid"      value="$uid">'
      '  <input type="hidden" name="from"     value="$from">'
      '  <input type="hidden" name="filesize" value="">'
    ));

    if ($public) {
      my $toh = join('<br>',@to);
      pq(qq(
        '  <input type="hidden" name="id" value="$public">'
        '  <input type="hidden" name="to" value="$to">'
        '  <table border="1">'
        '    <tr><td>sender:   <td><code>$from</code></tr>'
        '    <tr><td>recipient:<td><code>$toh</code></tr>'
      ));
    } elsif ($okey) {
      pq(qq(
        '  <input type="hidden" name="okey" value="$okey">'
        '  <input type="hidden" name="to" value="$to">'
        '  <table border="1">'
        '    <tr><td>sender:   <td>$from</tr>'
        '    <tr><td>recipient:<td>$to</tr>'
      ));
    } elsif ($skey) {
      pq(qq(
        '  <input type="hidden" name="skey" value="$skey">'
        '  <table border="1">'
        '    <tr><td>sender:   <td>$from</tr>'
        '    <tr><td>recipient:<td>$to</tr>'
      ));
    } elsif (@group) {
      if ($gkey) {
        pq(qq(
          '  <input type="hidden" name="gkey" value="$gkey">'
        ));
      }
      my $toh = "group $group:<ul>";
      my $toc = join(',',@group);
      foreach my $gm (@group) { $toh .= "<li>$gm" }
      $toh .= "</ul>";
      pq(qq(
        '  <input type="hidden" name="id" value="$id">'
        '  <table border="1">'
        '    <tr><td>sender:<td>$from</tr>'
        '    <tr><td>recipient(s):'
        '        <td><input type="hidden" name="to" value="$toc">$toh</tr>'
      ));
    } else {
      my $toc = join(',',@to);
      my $toh = join('<br>',@to);
      pq(qq(
        '  <input type="hidden" name="akey" value="$akey">'
        '  <table border="1">'
        '    <tr><td>sender:<td><a href="/foc">$from</a></tr>'
      ));
      if ($anonymous) {
        pq(qq(
          '    <tr><td>recipient:'
          '        <td><input type="hidden" name="to" value="$toc">$toh</tr>'
        ));
      } else {
        pq(qq(
          '    <tr><td><a href="/fup?akey=$akey&to=$toc">recipient(s)</a>:'
          '        <td><input type="hidden" name="to" value="$toc">$toh</tr>'
        ));
      }
    }

    $autodelete = lc $autodelete;
    $keep = $keep_default unless $keep;
    my ($quota,$du) = check_sender_quota($muser||$from);
    $quota = $quota
           ? "<tr><td>sender quota (used):<td>$quota ($du) MB</tr>"
           : '';

    $bwl = qq'<input type="text" name="bwlimit" size="8" value="$bwlimit"> kB/s';
    if (@throttle) {
      foreach (@throttle) {
        if (/\[?(.+?)\]?:(\d+)$/) {
          my $throttle = $1;
          my $limit = $2;
          # throttle ip address?
          if ($throttle =~ /^[\w:.-]+$/) {
            if (ipin($ra,$throttle)) {
              $bwl = qq'<input type="hidden" name="bwlimit" value="$limit"> $limit kB/s';
              last;
            }
          }
          # throttle e-mail address?
          else {
            # allow wildcard *, but not regexps
            $throttle =~ quotemeta $throttle;
            $throttle =~ s/\*/.*/g;
            if ($from =~ /^$throttle$/i) {
              $bwl = qq'<input type="hidden" name="bwlimit" value="$limit"> $limit kB/s';
              last;
            }
          }
        }
      }
    }

    $autodelete = $autodelete{$to} if $autodelete{$to};

    my $adt = '';
    for ($autodelete) {
         if (/yes/i)   { $adt = 'delete file after download' }
      elsif (/no/i)    { $adt = 'do not delete file after download' }
      elsif (/delay/i) { $adt = 'delete file after download with delay' }
      elsif (/^\d+$/)  { $adt = "delete file $autodelete days after download" }
    }
    $adt .= qq'<input type="hidden" name="autodelete" value="$autodelete">';

    my $ctr = my $ktr = '';
    if ($nomail) {
      $ctr = qq'<em>no notification e-mail will be send</em>';
    } else {
      $ctr = qq'<input type="text" name="comment" size="80" value="$comment">';
    }
    if ($captive) {
      $ktr = qq'$keep days<input type="hidden" name="keep" value="$keep">';
    } else {
      $ktr = qq'$keep days<input type="hidden" name="keep" value="$keep">';
    }
    pq(qq(
      '    <tr><td>autodelete:'
      '      <td>$adt'
      '    </tr>'
      '    <tr title="keep file max $keep days, then delete it"><td>keep:'
      '      <td>$ktr'
      '    </tr>'
      '    $quota'
      '    <tr title="optional, full speed if empty"><td>bandwith limit:'
      '      <td>$bwl'
      '    </tr>'
      '    <tr title="optional, will be included in notification e-mail"><td>comment:'
      '      <td>$ctr'
      '    </tr>'
      '    <tr title="If you want to send more than one file, then put them in a zip or tar archive"><td>file:'
      '      <td><input type="file" name="file" size="80" value="$file" onchange="reportsize();">'
      '    </tr>'
      '    <tr><td>file size:<td id="filesize"></td></tr>'
      '  </table>'
      '  <p>
      '  <input type="submit" value="upload" onclick="checkupload()">'
      '<p>'
      '</form>'
    ));
    if ($akey and -f "$from/\@" and not $captive) {
      print "<p>\n",
            "<a href=\"/foc?akey=$akey\">user config & operation control</a>\n";
    }
    if ($from eq $admin ) {
      pq(qq(
        '<p>'
        '<a href="/fac">server config & admin control</a>'
      ));
    }
    if (0 and -f "$docdir/FIX.jar" and not $okey) {
      print "<p>\n";
      if    ($public) { print "<a href=\"/fix?from=$from&id=$public&to=$to\">" }
      elsif ($skey)   { print "<a href=\"/fix?skey=$skey&to=$to\">" }
      elsif ($gkey)   { print "<a href=\"/fix?gkey=$gkey&to=$to\">" }
      else            { print "<a href=\"/fix?akey=$akey&to=$to\">" }
      print "Alternate Java client</a> (for files > 2 GB or sending of more than one file)\n";
    }
    print &logout;
    print $info_2;
    # printf "<hr><pre>%s</pre>\n",$ENV{HTTP_HEADER};
    print "</body></html>\n";
    exit;
  }

  present_locales('/fup');

  if ($ENV{REQUEST_METHOD} eq 'POST') {
    pq(qq(
      '<font color="red"><h3>'
      '  You have to fill out this form completely to continue.'
      '</h3></font>'
    ));
  }

  pq(qq(
    '<form action="/fup"'
    '      method="post"'
    '      accept-charset="UTF-8"'
    '      enctype="multipart/form-data">'
    '  <table>'
    '    <tr><td>sender:'
    '        <td><input type="text"     name="from" size="40" value="$from"></tr>'
    '    <tr><td>auth-ID:'
    '        <td><input type="password" name="id"   size="16" value="$id" autocomplete="off"></tr>'
    '  </table>'
  ));
  if ($mail_authid and not ($fop_auth or $nomail)) {
#    pq(qq(
#      'If you enter "?" as your auth-ID then it will be sent by e-mail to you.'
#      '<p>'
#    ));
    pq(qq(
      '  <input type="checkbox" name="ID_forgotten" value="ID_forgotten">'
      '  I have lost my auth-ID! Send it to me by e-mail! '
      '  (you must fill out sender field above)'
    ));
  }
  pq(qq(
    '  <p><input type="submit" value="check ID and continue"><p>'
  ));
  if (not $nomail and (
    @local_domains and @local_hosts or
    @local_rdomains and @local_rhosts or
    @demo
  )) {
    pq(qq(
      'You can <a href="/fur">register yourself</a> '
      'if you do not have a F*EX account yet.<p>'
    ));
  }
  if (@anonymous_upload and ipin($ra,@anonymous_upload)) {
    my $a = 'anonymous_'.int(rand(999999));
    pq(qq(
      'You may also use <a href="/fup?from=anonymous&to=$a">anonymous upload</a>'
    ));
  }
  # if (-f "$docdir/sup.html") {
  #  pq(qq(
  #    '<br>'
  #    'You may also use <a href="/sup.html">simple upload</a>'
  #  ));
  # }
  print "</form>\n";

  print $info_login||$info_1;

  if ($debug and $debug>1) {
    print "<hr>\n<pre>\n";
    foreach $v (sort keys %ENV) {
      print "$v = $ENV{$v}\n";
    }
    print "</pre>\n";
  }

  print "</body></html>\n";
  exit;
}

# from sup.html
if ($from and $file and not @to) {
  check_rr($from,$from);
  @to = ($from);
  $sup = 'fexyourself';
  $keep{$from} = readlink("$from/\@KEEP")||$keep_default;
}

# all these variables should be defined here, but just to be sure...
http_die("no file specified")	    unless $file;
http_die("no sender specified")     unless $from;
http_die("no recipient specified")  unless @to;
unless ($okey and -l "$to/\@OKEY/$okey") {
  http_die("no auth-ID specified") unless $id;
  unless ($rid eq $id or $gkey or $skey) {
    faillog("user $from, id $id");
    http_die("wrong auth-ID specified");
  }
}

&check_status($from);

if (@throttle) {
  foreach (@throttle) {
    if (/(.+):(\d+)$/) {
      my $throttle = $1;
      my $limit = $2;
      if (not $bwlimit or $limit < $bwlimit) {
        # throttle ip address?
        if ($throttle =~ /^[\d.-]+$/) {
          if (ipin($ra,$throttle)) {
            $bwlimit = $limit;
            last;
          }
        }
        # throttle e-mail address?
        else {
          # allow wildcard *, but not regexps
          $throttle =~ quotemeta $throttle;
          $throttle =~ s/\*/.*/g;
          if ($from =~ /^$throttle$/i) {
            $bwlimit = $limit;
            last;
          }
        }
      }
    }
  }
}

# address rewriting for storage (swap sender and recipient), see also fop!
if (not ($skey or $gkey) and $from =~ /^(anonymous|fexmail)/) {
  ($from,@to) = ("@to",$from);
}

if (not $anonymous and $overwrite =~ /^n/i) {
  foreach $to (@to) {
    if (-f "$to/$from/$fkey/data") {
      http_die("<code>$file</code> already exists for <code>$to</code>");
    }
  }
}

# additional last check
unless (@group or $gkey or $skey or $public or $okey) {
  foreach $to (@to) {
    checkaddress($to) or
      http_die("<code>$to</code> is not a valid e-mail address");
  }
}


$to = join(',',@to);

# file overwriting for anonymous is only possible if his client has the
# download cookie - else request purging
if ($anonymous and not $seek and my $dkey = readlink "$to/$from/$fkey/dkey") {
  if ($overwrite =~ /^n/i) {
    http_die("<code>$file</code> already exists for <code>$to</code>");
  }
  if ($ENV{HTTP_COOKIE} !~ /$dkey/) {
    my $purge = "/fop/$dkey/$dkey?purge";
    # http_die("$file already exists $dkey:$ENV{HTTP_COOKIE}:");
    http_die("<code>$file</code> already exists - <a href=\"$purge\">purge it?!</a>");
  }
}

if (@group) {
  @to = @group;
  $comment = "[$group] $comment";
} elsif ($public) {
  $comment .= ' (public upload)';
}

# file data still waits on STDIN ... get it now!
&get_file;

if ($to eq $from and $file eq 'ADDRESS_BOOK') {
  unlink "$from/\@ADDRESS_BOOK";
  rename "$from/$from/ADDRESS_BOOK/upload","$from/\@ADDRESS_BOOK"
    or http_die("cannot save $from/\@ADDRESS_BOOK - $!\n");
  http_header('200 OK');
  print html_header($head);
  print "address book updated",
        "</body></html>\n";
  exit;
}

# finalize upload
unless ($nostore) {
  foreach (@group?@group:@to) {
    my $to = $_;
    $to =~ s/:\w+=.*//; # remove options from address
    $filed     = "$to/$from/$fkey";
    $save      = "$filed/data";
    $upload    = "$filed/upload";
    $download  = "$filed/download";
    $dkey{$to} = readlink "$filed/dkey";
    $overwrite{$to}++ if -f $save and not -f $download;
    unlink $save,$download;
    rename $upload,$save or http_die("cannot rename $upload to $save - $!\n");

    # log dkey
    my $msg = sprintf "%s %s %s %s %s\n",
                      isodate(time),$dkey{$to},$from,$to,$fkey;
    writelog('dkey.log',$msg);

    # send notification e-mails if necessary
    if (not $nomail and (readlink "$to/\@NOTIFICATION"||'') !~ /^no/i
        and ($comment or not $overwrite{$to})) {
      notify_locale($dkey{$to},'new');
      debuglog("notify $filed [$filename] '$comment'");
    }
  }
}

# send HTTP status
$HTTP_HEADER = 'HTTP/1.1 200 OK';
if ($nostore) {
  nvt_print($HTTP_HEADER,'Content-Type: text/html','');
  exit if $http_client =~ /^fexsend/;
} elsif ($file eq 'STDFEX') {
  nvt_print($HTTP_HEADER,'');
  exit;
} else {
  nvt_print($HTTP_HEADER);
  if ($xkey and not $restricted) {
    my $x = "$durl//$xkey";
    $x =~ s:/fop::;
    nvt_print("X-Location: $x");
  }
  if ($anonymous) {
    my $dkey = $dkey{$to};
    my $cookie = $dkey;
    $cookie = $1 if $ENV{HTTP_COOKIE} =~ /anonymous=([\w:]+)/;
    $cookie .= ':'.$dkey if $cookie !~ /$dkey/;
    nvt_print("Set-Cookie: anonymous=$cookie");
    $keep{$to} = readlink("$to/\@KEEP")||$keep_default;
  }
  foreach (@group?@group:@to) {
    my $to = $_;
    $to =~ s/:\w+=.*//; # remove options from address
    my $file = "$to/$from/$fkey";
    # my $options = sprintf "(autodelete=%s,keep=%s,locale=%s,notification=%s)",
    my $options = sprintf "(autodelete=%s,keep=%s,locale=%s)",
      readlink("$file/autodelete")||$autodelete,
      readlink("$file/keep")||readlink("$to/\@KEEP")||$keep_default,
      readlink("$to/\@LOCALE")||readlink("$file/locale")||$default_locale;
      # readlink("$to/\@NOTIFICATION")||'full';
    nvt_print("X-Recipient: $to $options");
    nvt_print("X-Location: $durl/$dkey{$to}/$fkey") unless $restricted;
  }
  if ($http_client =~ /^(fexsend|schwuppdiwupp)/) {
    nvt_print('');
    exit;
  } else {
    nvt_print('Content-Type: text/html','');
  }
}

# send HTML report
print html_header($head);

if ($nostore) {
  printf "%s (%s MB) received\n",$file,int($ndata/$MB);
} elsif (not $restricted and ($anonymous or $from eq $to)) {
  my $size = $ndata<2*1024 ? sprintf "%s B",$ndata:
             $ndata<2*$MB  ? sprintf "%s kB",int($ndata/1024):
                             sprintf "%s MB",int($ndata/$MB);
  pq(qq(
    '<code>$file</code> ($size) received and saved<p>'
    'Download URL for copy & paste:'
    '<h2>$durl/$dkey{$to}/$fkey</h2>'
    'Link is valid for $keep{$to} days!<p>'
  ));
} else {
  if ($ndata<2*1024) {
    print "<code>$file</code> ($ndata B) received and saved<p>\n";
    if (not $boring and not $seek) {
      print "Ehh... $ndata <b>BYTES</b>?! You are kidding?<p>\n";
    }
  } elsif ($ndata<2*$MB) {
    $ndata = int($ndata/1024);
    print "<code>$file</code> ($ndata kB) received and saved<p>\n";
    if ($ndata<1024 and not ($boring or $seek)) {
      print "Using F*EX for less than 1 MB: ",
        "ever heard of MIME e-mail? &#9786;<p>\n";
    }
  } else {
    $ndata = int($ndata/$MB);
    print "<code>$file</code> ($ndata MB) received and saved<p>\n";
  }
  print "<ul>\n";
  foreach $to (@to) {
    print "<li>";
    if ($nomail or $nomail{$to}) {
      if ($restricted) {
        rmrf("$to/$from/$fkey");
        print "<code>$file</code> removed because you are a restricted user ".
              "and recipient $to cannot receive e-mail<p>\n";
      } else {
        pq(qq(
          '$to cannot receive e-mail &rarr;'
          '<h3><font color="red">'
          '  No notification e-mail has been sent to $to!'
          '</font></h3>'
          'Download URL for copy & paste:'
        ));
        if ($xkey) {
          my $x = "$durl{$to}//$xkey";
          $x =~ s:/fop::;
          print "<h2><code>$x</code></h2>\n";
        } else {
          print "<h2>$durl/$dkey{$to}/$fkey</h2>\n";
          print "Link is valid for $keep{$to} days!<p>\n";
        }
      }
    } elsif ($overwrite{$to} and not $comment) {
      print "(old <code>$file</code> for $to overwritten)<p>\n"
    } else {
      print "$to notified<p>\n"
    }
  }
  print "</ul>\n";
}

if ($okey) {
  unlink "$to/\@OKEY/$okey";
} elsif (not $anonymous and not $sup) {
  print "<a href=\"/fup?submit=again";
  if    ($public) { print "&from=$from&to=$to&id=$id" }
  elsif ($skey)   { print "&skey=$skey" }
  elsif ($gkey)   { print "&gkey=$gkey" }
  elsif ($akey)   { print "&akey=$akey&to=$to" }
  print "&bwlimit=$bwlimit&autodelete=$autodelete&keep=$keep\">";
  print "send another file</a>\n";
  if ($http_client !~ /fexsend/ and $http_client =~ /Linux/i) {
    print '<p>Hi Linux-user, try ',
          '<a href="/FAQ/user.html#Why_should_I_use_a_special_F_EX_client">',
          "fexsend</a>! &#9786;<p>\n";
  }
  if ($http_client !~ /fexit/ and $http_client =~ /Windows/i) {
    print '<p>Hi Windows-user, try <a href="/fexit.html">fexit</a>! ',
          "&#9786;<p>\n";
  }
  print &logout;
}

print "</body></html>\n";
exit;


# parse GET and POST requests
sub parse_request {
  my %to;
  my ($to,$dkey);
  my ($x,$k,$v);
  my $qs = $ENV{QUERY_STRING};
  local $_;

  # get JUP parameters from environment (HTTP headers)
  while (($k,$v) = each %ENV) {
    if ($k =~ s/^FEX_//) {
      setparam($k,$v);
    }
  }

  # decode base64 PATH_INFO to QUERY_STRING
  if ($ENV{PATH_INFO} =~ m:^/(\w+=*)$:) {
    if ($qs) {
      $qs = sprintf("%s&%s",decode_b64($1),$qs);
    } else {
      $qs = decode_b64($1);
    }
  }

  # parse HTTP QUERY_STRING (parameter=value pairs)
  if ($qs) {
    foreach (split '&',$qs) {
      if (s/^(\w+)=(.*)//) {
        my $p = uc($1);
        my $v = $2;
        # decode URL-encoding
        $v =~ s/%([a-f0-9]{2})/chr(hex($1))/gie;
        setparam($p,$v);
        if ($p eq 'AUTODELETE') {
          $specific{'autodelete'} = $autodelete = $v;
        }
        if ($p eq 'KEEP' and /^\d+$/) {
          $specific{'keep'} = $keep = $v;
        }
        # if ($p eq 'LOCALE') {
        #   $specific{'locale'} = $locale = $v;
        # }
      }
    }
  }

  # HTTP redirect does not work correctly with opera!
  # ==> locale handling is now done by fexsrv
  if (0 and $locale) {
    nvt_print(
      "HTTP/1.1 302 Found",
      "Location: $ENV{PROTO}://$ENV{HTTP_HOST}/fup",
      "Set-Cookie: locale=$locale",
      'Expires: 0',
      'Content-Length: 0',
      ''
    );
    &reexec;
  }

  if ($showstatus) {
    &showstatus;
    exit;
  }

  # check for akey, gkey and skey (from HTTP GET)
  &check_keys;

  if ($ENV{REQUEST_METHOD} eq 'POST' and $cl) {
    foreach $sig (keys %SIG) {
      if ($sig !~ /^(CHLD|CLD)$/) {
        $SIG{$sig} = \&sigexit;
      }
    }
    $SIG{PIPE} = 'IGNORE' if $ENV{PROTO} eq 'https'; # stunnel workaround
    $SIG{__DIE__} = \&sigdie;
    http_die("invalid Content-Length header \"$cl\"") if $cl !~ /^-?\d+$/;
    debuglog($0);
    debuglog(sprintf("awaiting %d bytes from %s %s",
                     $cl,$ENV{REMOTE_ADDR}||'',$ENV{REMOTE_HOST}||''),"\n");

    &check_space($cl) if $cl > 0;

    $SIG{ALRM} = sub {
      $SIG{__DIE__} = 'DEFAULT';
      die "TIMEOUT\n";
    };
    alarm($timeout);
    binmode(STDIN,':raw');

    if (defined($ENV{FEX_FILENAME})) {
      # JUP via HTTP header
      $file = $param{'FILE'} = $ENV{FEX_FILENAME};
      $fileid = $ENV{FEX_FILEID} || 0;
      $fpsize = $ENV{X_CONTENT_LENGTH} || 0;
      $boundary = '';
    } elsif ($contentlength) {
      # JUP via URL parameter
      $fpsize = $contentlength;
      $boundary = '';
    } else {
      # FUP
      if ($ENV{CONTENT_TYPE} =~ /boundary=\"?([\w\-\+\/_]+)/) {
        $boundary = $1;
      } else {
        http_die("malformed HTTP POST (no boundary found)");
      }

      READPOST: while (&nvt_read) {
        # the file itself - *must* be last part of POST!
        if (/^Content-Disposition:\s*form-data;\s*name="file";\s*filename="(.+)"/i) {
          push @header,$_;
          $file = $param{'FILE'} = $1;
          while (&nvt_read) {
            last if /^\s*$/;
            $fileid = $1 if /^X-File-ID:\s*(.+)/;
            $fpsize = $1 if /^Content-Length:\s*(\d+)/;
            $flink  = $1 if /^Content-Location:\s*(\/.+)/;
            push @header,$_;
          }
          # STDIN is now at begin of file, will be read later with get_file()
          last;
        }
        # all other parameters
        if (/^Content-Disposition:\s*form-data;\s*name="([a-z]\w*)"/i) {
          my $x = $1;
          nvt_skip_to('^\s*$');
          &nvt_read;
          setparam($x,$_);
          NEXTPART: while (&nvt_read) {
            last READPOST if /^--\Q$boundary--/;
            last NEXTPART if /^--\Q$boundary/;
          }
        }
      }
    }

    if (length($file)) {
      $file =~ s/%(\d+)/chr($1)/ge;
      $file = untaint(strip_path(normalize($file)));
      $file =~ s/[\\\/<>]/_/g; # filter out dangerous chars
      $file =~ s/^\|//;        # filter out dangerous chars
      $file =~ s/\|$//;        # filter out dangerous chars
      $filename = $file;
      $fkey = urlencode($file);
    }

    # check for akey, gkey and skey (from HTTP POST)
    &check_keys;

  }

  if ($from) {
    unless ($skey or $gkey or $okey) {
      $from .= '@'.$mdomain if $mdomain and $from !~ /@/;
      if ($from ne 'anonymous' and not checkaddress($from)) {
        http_die("<code>$from</code> is not a valid e-mail address");
      }
    }
    $from = untaint($from);
  }

  # collect multiple addresses and check for aliases (not group)
  if (@to and "@to" !~ /^@[\w-]+$/
      and not ($gkey or $addto or $command =~ /^LIST(RECEIVED)?$/)) {
    # read address book
    if ($from and open my $AB,'<',"$from/\@ADDRESS_BOOK") {
      my ($alias,$addresses,$autodelete,$locale,$keep);
      while (<$AB>) {
        s/#.*//;
        $_ = lc $_;
        if (s/^\s*(\S+)[=\s]+(\S+)//) {
          ($alias,$addresses) = ($1,$2);
          # alias specific options?
          $autodelete = $locale = $keep = '';
          $autodelete = $1 if /autodelete=(\w+)/;
          $locale     = $1 if /locale=(\w+)/;
          $keep       = $1 if /keep=(\d+)/;
          foreach my $address (split(",",$addresses)) {
            # alias address specific :options?
            if ($address =~ s/(.+?):(.+)/$1/) {
              my @options = split(':',$2);
              $address = expand($address);
              foreach (@options) {
                if (/^keep=(\d+)$/i) {
                  $alias_keep{$alias}{$address} = $1
                }
                if (/^autodelete=(yes|no|delay)$/i) {
                  $alias_autodelete{$alias}{$address} = $1
                }
                if (/^locale=(\w+)$/i) {
                  $alias_locale{$alias}{$address} = $1
                }
              }
            } else {
              $address = expand($address);
            }
            push @{$ab{$alias}},$address;
            $autodelete{$alias} = $autodelete if $autodelete;
            $keep{$alias}       = $keep       if $keep;
            $locale{$alias}     = $locale     if $locale;
          }
        }
      }
      close $AB;
    }

    # look for recipient's options and eliminate dupes
    %to = ();
    foreach my $to (my @loop = @to) {
      # address book alias?
      if ($to !~ /@/ and ($ab{$to} or $to =~ /(.+?):(.+)/ and $ab{$1})) {
        my $alias = $to;
        my @options = ();
        $alias =~ s/:(.*)// and @options = split(':',$1);
        if (@options) {
          # alias with :options
          $alias =~ s/:.*//;
          foreach my $address (my @loop = @{$ab{$alias}}) {
            $to{$address} = $address; # ignore dupes
            foreach (@options) {
              $keep{$address} = $1       if /^keep=(\d+)$/i;
              $autodelete{$address} = $1 if /^autodelete=(yes|no|delay)$/i;
              $locale{$address} = $1     if /^locale=(\w+)$/i;
            }
          }
        }
        foreach my $address (my @loop = @{$ab{$alias}}) {
          $to{$address} = $address; # ignore dupes
          unless ($keep{$address}) {
            $keep{$address} = $keep{$alias} if $keep{$alias};
            if ($specific{'keep'}) {
              $keep{$address} = $specific{'keep'}
            } elsif (my $keep = $alias_keep{$alias}{$address}) {
              $keep{$address} = $keep;
            } elsif ($keep{$alias}) {
              $keep{$address} = $keep{$alias}
            }
          }
          unless ($autodelete{$address}) {
            if ($specific{'autodelete'}) {
              $autodelete{$address} = $specific{'autodelete'};
            } elsif (my $autodelete = $alias_autodelete{$alias}{$address}) {
              $autodelete{$address} = $keep;
            } elsif ($autodelete{$alias}) {
              $autodelete{$address} = $autodelete{$alias};
            } else {
              $autodelete{$address} = readlink "$address/\@AUTODELETE"
                                      || $autodelete;
            }
          }
          unless ($locale{$address}) {
            if (my $locale = readlink "$address/\@LOCALE") {
              $locale{$address} = $locale;
            } elsif ($locale{$alias}) {
              $locale{$address} = $locale{$alias};
            } elsif ($locale = $alias_locale{$alias}{$address}) {
              $locale{$address} = $locale;
            } else {
              $locale{$address} = $::locale ;
            }
            $locale{$address} ||= $default_locale || 'english';
          }
        }
      } else {
        # regular address, not an alias
        if ($to =~ s/(.+?):(.+)/$1/) {
          my @options = split(':',$2);
          $to = expand($to);
          foreach (@options) {
            $keep{$to} = $1       if /^keep=(\d+)$/i;
            $autodelete{$to} = $1 if /^autodelete=(yes|no|delay)$/i;
            $locale{$to} = $1     if /^locale=(\w+)$/i;
          }
        }
        $to = expand($to);
        $to{$to} = $to; # ignore dupes
        unless ($autodelete{$to}) {
          $autodelete{$to} = untaint(readlink("$to/\@AUTODELETE")
                                     ||$autodelete);
          if ($specific{'autodelete'}) {
            $autodelete{$to} = $specific{'autodelete'};
          }
        }
        unless ($keep{$to}) {
          $keep{$to} = $keep_default;
          $keep{$to} = $keep                          if $keep;
          $keep{$to} = untaint(readlink "$to/\@KEEP") if -l "$to/\@KEEP";
          $keep{$to} = $specific{'keep'}              if $specific{'keep'};
        }
      }
      $autodelete{$to} = 'NO' if $to =~ /$amdl/; # mailing lists, etc
      if (-e "$to/\@CAPTIVE") {
        my $v;
        $v = readlink "$to/\@AUTODELETE" and $autodelete{$to} = $v;
        $v = readlink "$to/\@KEEP"       and $keep{$to}       = $v;
      }
    }
    @to = keys %to;

    if (scalar(@to) == 1) {
      $to = "@to";
      $keep       = $keep{$to}       if $keep{$to};
      $autodelete = $autodelete{$to} if $autodelete{$to};
    }

    # check recipients and eliminate dupes
    %to = ();
    foreach $to (@to) {
      if ($to eq 'anonymous') {
        $to{$to} = $to;
      } else {
        if ($to =~ /^@(.+)/) {
          http_die("You cannot send to more than one group") if @to > 1;
          http_die("Group <code>$to</code> does not exist") unless -f "$from/\@GROUP/$1";
        } else {
          if ($skey or $gkey or $okey or checkaddress($to)) {
            $to .= '@'.$mdomain if $mdomain and $to !~ /@/;
            $to{$to} = untaint($to);
          } else {
            http_die("<code>$to</code> is not a valid e-mail address");
          }
        }
      }
    }
    @to = values %to;
  }

  foreach $to (@to) {
    unless (checkforbidden($to)) {
      http_die("<code>$to</code> is not allowed");
    }
  }
}


# show the status progress bar
sub showstatus {
  my $wclose;
  my ($upload,$data,$sfile,$ukey,$file);
  my ($nsize,$tsize);
  my ($t0,$t1,$t2,$tt,$ts,$tm);
  my ($osize,$percent,$npercent);
  local $_;

  $wclose = '<p><a href="#" onclick="window.close()">close</a>'."\n".
            '</body></html>'."\n";
  $ukey   = "$ukeydir/$uid";
  $upload = "$ukey/upload";
  $data   = "$ukey/data";
  $sfile  = "$ukey/size";
  for (1..$timeout) {
    sleep 1;
    $tsize = readlink $sfile and last;
    # upload error?
    # remark: stupid Internet Explorer *needs* the error represented in this
    # asynchronous popup window, because it cannot display the error in the
    # main window on HTTP POST!
    if (-f $ukey and open $ukey,'<',$ukey or
        -f "$ukey/error" and open $ukey,'<',"$ukey/error") {
      undef $/;
      unlink $ukey;
      html_error($error,<$ukey> || 'unknown');
    }
  }
  # unlink $sfile;

  if (defined $tsize and $tsize == 0) {
    print "<script type='text/javascript'>window.close()</script>\n";
    exit;
  }
  unless ($tsize) {
    html_error($error,
               "no file data received - does your file exist or is it >2GB?")
  }
  html_error($error,"file size unknown") unless $tsize =~ /^\d+$/;

  http_header('200 OK');
  if (open $ukey,'<',"$ukey/filename") {
    local $/;
    $file = <$ukey>;
    close $ukey;
  }
  http_die("no filename?!") unless $file;

  my $ssize = $tsize;
  if ($ssize<2097152) {
    $ssize = sprintf "%d kB",int($ssize/1024);
  } else {
    $ssize = sprintf "%d MB",int($ssize/1048576);
  }

  pq(qq(
    "<html><body>"
    "<center>"
    "<h1>Upload Status for<br><code>$file ($ssize)</code></h1>"
    '<img src="/action-fex-camel.gif" id="afc">'
    "</center>"
    "<input type='text' id='percent' style='margin-left:1ex;color:black;background:transparent;border:none;width:32ex;' disabled='true' value='0%'>"
    "<div style='border:1px solid black;width:100%;height:20px;'>"
    "<div style='float:left;width:0%;background:black;height:20px;' id='bar'>"
    "</div></div>"
  ));

  # wait for upload file
  for (1..9) {
    last if -f $upload or -f $data;
    sleep 1;
  }
  unless (-f $upload or -f $data) {
    print "<p><H3>ERROR: no upload received</H3>\n";
    print $wclose;
    exit;
  }

  $SIG{ALRM} = sub {
    $SIG{__DIE__} = 'DEFAULT';
    die "TIMEOUT in showstatus: no (more) data received\n";
  };
  alarm($timeout*2);

  $t0 = $t1 = time;
  $osize = $percent = $npercent = 0;

  for ($percent = 0; $percent<100; sleep(1)) {
    $t2 = time;
    $nsize = -s $upload;
    if (defined $nsize) {
      if ($nsize<$osize) {
        print "<p><h3>ABORTED</h3>\n";
        print $wclose;
        exit;
      }
      if ($nsize>$osize) {
        alarm($timeout*2);
        $osize = $nsize;
      }
      $npercent = int($nsize*100/$tsize);
      $showsize = calcsize($tsize,$nsize);
    } else {
      $npercent = 100;
      $showsize = calcsize($tsize,$tsize);
    }
    # hint: for ISDN (or even slower) links, 5 s tcp delay is minimum
    # so, updating more often is contra-productive
    if ($t2>$t1+5 or $npercent>$percent) {
      $percent = $npercent;
      $t1 = $t2;
      $tm = int(($t2-$t0)/60);
      $ts = $t2-$t0-$tm*60;
      $tt = sprintf("%d:%02d",$tm,$ts);
      pq(qq(
        "<script type='text/javascript'>"
        "  document.getElementById('bar').style.width = '$percent%';"
        "  document.getElementById('percent').value = '$showsize, $tt, $percent %';"
        "</script>"
      )) or last;
    }
  }

  alarm(0);
  if ($npercent == 100) {
    print "<h3>file successfully transferred</h3>\n";
  } else {
    print "<h3>file transfer aborted</h3>\n";
  }
  pq(qq(
    "<script type='text/javascript'>"
    "  document.getElementById('afc').src='/logo.jpg'"
    "</script>"
  ));
  print $wclose;
  unlink $ukey;
  exit;
}


# get file from post request
sub get_file {
  my ($to,$filed,$upload,$nupload,$speed,$download);
  my ($b,$n,$uss);
  my $dkey;
  my ($fh,$filesize);
  my ($t0,$tt);
  my $fb = 0;		# file bytes
  my $ebl = 0;		# end boundary length

  # FUP, not JUP
  if ($boundary) {
    $ebl = length($boundary)+8; # 8: 2 * CRLF + 2 * "--"
  }

  unless ($nostore) {

    # download already in progress?
    foreach $to (@to) {
      $to =~ s/:\w+=.*//; # remove options from address
      $filed = "$to/$from/$fkey";
      $download = "$filed/download";
      if (-f $download and open $download,'>>',$download) {
        flock($download,LOCK_EX|LOCK_NB) or
          http_die("<code>$filed</code> locked: a download is currently in progress");
      }
    }

    # prepare upload
    foreach $to (@to) {
      $to =~ s/:\w+=.*//; # remove options from address
      $filed = "$to/$from/$fkey";
      $nupload = "$filed/upload"; # upload for next recipient
      mkdirp($filed);

      # upload already prepared (for first recipient)?
      if ($upload) {
        # link upload for next recipient
        unless ($upload eq $nupload or
                -r $upload and -r $nupload and
                (stat $upload)[1] == (stat $nupload)[1])
        {
          unlink $nupload;
          link $upload,$nupload;
        }
      }

      # first recipient => create upload
      else {
        $upload = $nupload;
        unlink "$ukeydir/$uid";
        if ($flink) {
          if ($seek) {
            http_die("cannot resume on link upload");
          }
          &nvt_read and $flink = $_;
          if ($flink !~ /^\//) {
            http_die("no file link name ($flink)");
          }
          $flink = abs_path($flink);
          my $fok;
          foreach (@file_link_dirs) {
            my $dir = abs_path($_);
            $fok = $flink if $flink =~ /^\Q$dir\//;
          }
          unless ($fok) {
            http_die("<code>$flink</code> not allowed for linking");
          }
          my @s = stat($flink);
          unless (@s and ($s[2] & S_IROTH) and -r $flink) {
            http_die("cannot read <code>$flink</code>");
          }
          unless (-f $flink and not -l $flink) {
            http_die("<code>$flink</code> is not a regular file");
          }
          # http_die("DEBUG: flink = $flink");
          &nvt_read;
          &nvt_read if /^$/;
          unless (/^--\Q$boundary--/) {
            http_die("found no MIME end boundary in upload ($_)");
          }
          unlink $upload;
          symlink untaint($flink),$upload;
        } else {
          unlink $upload if -l $upload;
          open $upload,'>>',$upload or http_die("cannot write $upload - $!");
          flock($upload,LOCK_EX|LOCK_NB) or
            http_die("<code>$file</code> locked: a transfer is already in progress");
          unless ($seek) {
            seek $upload,0,0;
            truncate $upload,0;
          }
          # already uploaded file data size
          $uss = -s $upload;
          # provide upload ID symlink for showstatus
          symlink "../$filed","$ukeydir/$uid";
        }
      }

      unlink "$filed/autodelete",
             "$filed/error",
             "$filed/restrictions",
             "$filed/locale",
             "$filed/keep",
             "$filed/header",
             "$filed/id",
             "$filed/ip",
             "$filed/speed",
             "$filed/replyto",
             "$filed/useragent",
             "$filed/uurl",
             "$filed/comment",
             "$filed/notify";
      unlink "$filed/size" unless $seek;

      # showstatus needs file name and size
      # fexsend needs full file size (+$seek)
      $fh = "$filed/filename";
      open $fh,'>',$fh or die "cannot write $fh - $!\n";
      print {$fh} $filename;
      close $fh;
      if ($::filesize > 0 or $cl > 0) {
        if ($::filesize > 0) { $filesize = $fpsize || $::filesize }
        else                 { $filesize = $cl-$RB-$ebl+$seek }
        # new file
        unless ($seek) {
          if ($::filesize > 0) {
            # total file size as reported by POST
            mksymlink("$filed/size",$::filesize)
              or die "cannot write $filed/size - $!\n";
          } else {
            # file size as counted
            mksymlink("$filed/size",$filesize)
              or die "cannot write $filed/size - $!\n";
          }
        }
      }

      if ($from eq "@to") {
        # special "fex yourself"
        mksymlink("$filed/autodelete",$specific{'autodelete'}||'NO');
      } else {
        $autodelete{$to} = $autodelete unless $autodelete{$to};
        if ($autodelete{$to} =~ /^(DELAY|NO|\d+)$/i) {
          mksymlink("$filed/autodelete",$autodelete{$to});
        }
      }

      if (my $keep = $keep{$to} || $::keep) {
        mksymlink("$filed/keep",$keep);
      }
      mksymlink("$filed/id",$fileid) if $fileid;
      mksymlink("$filed/ip",$ra)     if $ra;
      if (my $uurl = $ENV{REQUEST_URL}) {
        mksymlink("$filed/uurl",$uurl);
      }
      if ($http_client and open $http_client,'>',"$filed/useragent") {
        print {$http_client} $http_client,"\n";
        close $http_client;
      }
      if ($_ = readlink "$to/\@LOCALE") {
        # mksymlink("$filed/locale",$_);
      } elsif ($locale{$to}) {
        mksymlink("$filed/locale",$locale{$to});
      } elsif ($locale and $locale ne $default_locale) {
        mksymlink("$filed/locale",$locale);
      }
      if ($replyto and $replyto =~ /.@./) {
        mksymlink("$filed/replyto",$replyto);
      }

      my $arh = "$from/\@ALLOWED_RHOSTS";
      if (-s $arh) {
        copy($arh,"$filed/restrictions");
      }

      if (@header and open $fh,'>',"$filed/header") {
        print {$fh} join("\n",@header),"\n";
        close $fh;
      }

      if ((readlink "$to/\@NOTIFICATION"||'') =~ /^no/i) {
        $nomail{$to} = 'NOTIFICATION';
      }

      if ($nomail) {
        open $fh,'>',"$filed/notify" and close $fh;
      }
      if ($comment) {
        if (open $fh,'>',"$filed/comment") {
          print {$fh} encode_utf8($comment);
          close $fh;
        }
      }

      # provide download ID key
      unless ($dkey = readlink("$filed/dkey") and -l "$dkeydir/$dkey") {
        $dkey = randstring(8);
        unlink "$dkeydir/$dkey";
        symlink "../$filed","$dkeydir/$dkey"
          or http_die("cannot symlink $dkeydir/$dkey ($!)");
        unlink "$filed/dkey";
        symlink $dkey,"$filed/dkey";
      }

    }

    # extra download (XKEY)?
    if ($anonymous and $fkey =~ /^afex_\d/ or
        $from eq "@to" and $comment =~ s:^//(.*)$:NOMAIL:)
    {
      $xkey = $1||$fkey;
      $nomail = $comment;
      my $x = "$xkeydir/$xkey";
      unless (-l $x and readlink($x) eq "../$from/$from/$fkey") {
        if (-e $x) {
          http_die("extra download key $xkey already exists");
        }
        symlink "../$from/$from/$fkey",$x
          or http_die("cannot symlink $x - $!\n");
        unlink "$x/xkey";
        symlink $xkey,"$x/xkey";
      }
    }

  }

  # file link?
  if ($flink) {
    # upload link has been already created, no data to read any more
    $to = join(',',@to);
    fuplog($to,$fkey,0);
    debuglog("upload link successfull, dkey=$dkey");
  }

  # regular file
  else {

    # at last, read (real) file data
    $t0 = time();

    # streaming data?
    if ($cl == -1) {
      alarm($timeout*2);
      # read until EOF, including MIME end boundary
      # note: cannot use sysread because of previous buffered read!
      while ($n = read(STDIN,$_,$bs)) {
        $RB += $n;
        $fb += $n;
        syswrite $upload,$_ unless $nostore;
        alarm($timeout*2);
      }
      # size of transferred file, without end boundary
      $ndata = untaint($fb-$ebl);
    }

    # normal file with known file size
    else {

      if ($fpsize) {
        debuglog(sprintf("still awaiting %d+%d = %d bytes",
                 $fpsize,$ebl,$fpsize+$ebl));
        $cl = $RB+$fpsize+$ebl; # recalculate CONTENT_LENGTH
      } else {
        if ($::filesize) {
          $cl = $RB+$::filesize+$ebl; # recalculate CONTENT_LENGTH
        }
        debuglog(sprintf("still awaiting %d-%d = %d bytes",
                         $cl,$RB,$cl-$RB));
      }
      # read until end boundary, not EOF
      while ($RB < $cl-$ebl) {
        $b = $cl-$ebl-$RB;
        $b = $bs if $b > $bs;
        # max wait for 1 kB/s, but at least 10 s
        # $timeout = $b/1024;
        # $timeout = 10 if $timeout < 10;
        alarm($timeout);
        if ($n = read(STDIN,$_,$b)) {
          $RB += $n;
          $fb += $n;
          # syswrite is much faster than print
          syswrite $upload,$_ unless $nostore;
          if ($bwlimit) {
            alarm(0);
            $tt = (time-$t0) || 1;
            while ($RB/$tt/1024 > $bwlimit) {
              sleep 1;
              $tt = time-$t0;
            }
          }
          # debuglog($_);
        } else {
          last;
        }
      }
      # read end boundary - F*IX is broken!
      if ($ebl and $http_client !~ /F\*IX/) {
        $_ = <STDIN>;
        $_ = <STDIN>||'';
        unless (/^--\Q$boundary--/) {
          http_die("found no MIME end boundary in upload ($_)");
        }
      }
      $RB += $ebl;
      $ndata = untaint($fb);
    }

    alarm(0);

    unless ($nostore) {
      close $upload; # or die "cannot close $upload - $!\n";;

      # throuput in kB/s
      $tt = (time-$t0) || 1;
      mksymlink("$filed/speed",int($fb/1024/$tt));

      unless ($ndata) {
        http_die(
          "No file data received!".
          " File name correct?".
          " File too big (browser-limit: 2 GB!)?"
        );
      }

      $to = join(',',@to);

      # streaming upload?
      if ($cl == -1) {

        open $upload,'<',$upload or http_die("internal error - cannot read upload");
        seek $upload,$ndata+2,0;
        $_ = <$upload>||'';
        unless (/^--\Q$boundary--/) {
          http_die("found no MIME end boundary in upload ($_)");
        }
        close $upload;
        truncate $upload,$ndata;

      } else {

        # truncate boundary string
        # truncate $upload,$ndata+$uss if -s $upload > $ndata+$uss;

        # incomplete?
        if ($cl != $RB) {
          fuplog($to,$fkey,$ndata,'(aborted)');
          if ($fpsize) {
            http_die("read $RB bytes, but Content-Length announces $fpsize bytes");
          } else {
            http_die("read $RB bytes, but CONTENT_LENGTH announces $cl bytes");
          }
        }

        # multipost, not complete
        if ($::filesize > -s $upload) {
          http_header('206 Partial OK');
          exit;
        }

        # save error?
        if (-s $upload > ($::filesize||$filesize)) {
          fuplog($to,$fkey,$ndata,'(write error: upload > filesize)');
          http_die("internal server error while writing file data");
        }

      }
      fuplog($to,$fkey,$ndata);
      debuglog("upload successfull, dkey=$dkey");
    }
  }
}


# check recipients restriction
sub check_rr {
  my $from = shift;
  my @to = @_;
  my $rr = "$from/\@ALLOWED_RECIPIENTS";
  my ($allowed,$to,$ar,$rd);

  if (-s $rr and open $rr,'<',$rr) {

    $restricted = $rr;

    foreach (@to) {
      my $to = $_;
      $allowed = 0;
      seek $rr,0,0;
      while (<$rr>) {
        chomp;
        s/#.*//;
        s/\s//g;

        if (/^\@LOCAL_RDOMAINS/) {
          $ar = '(@';
          foreach (@local_rdomains) {
            my $rd = $_;
            # allow wildcard *, but not regexps
            $rd =~ s/\./\\./g;
            $rd =~ s/\*/[\\w.-]+/g;
            $ar .= '|[^\@]+\@' . $rd;
          }
          $ar .= ')';
        } elsif (/^\@LOCAL_USERS/ and -s "$to/@") {
          $allowed = 1;
          last;
        } else {
          # allow wildcard *, but not regexps
          $ar = quotemeta $_;
          $ar =~ s/\\\*/[^@]*/g;
        }

        if ($to =~ /^$ar$/i) {
          $allowed = 1;
          last;
        }

      }

      unless ($allowed) {
        fuplog("ERROR: $from not allowed to fex to $to");
        debuglog("$to not in $spooldir/$from/\@ALLOWED_RECIPIENTS");
        http_die("You ($from) are not allowed to fex to $to");
      }
    }

    close $rr;
  }
}


# add domain to user if necessary
sub expand {
  my @users = @_;
  my @ua;

  foreach my $u (my @loop = @users) {
    if ($u =~ /^anonymous(_\d+)?$/) {
      $u = "$u\@$hostname";
    }
    if ($u eq 'nettest') {
      if ($mdomain and -d "$u\@$mdomain") {
        $u .= "\@$mdomain"
      } elsif (-d "$u\@$hostname") {
        $u .= "\@$hostname"
      }
    }
    if    ($u =~ /@/)          { push @ua,$u }
    elsif ($mdomain)           { push @ua,"$u\@$mdomain" }
    elsif (-d "$u\@$hostname") { push @ua,"$u\@$hostname" }
    else                       { push @ua,$u }
  }

  return wantarray ? @ua : join(',',@ua);
}


# forward-copy (bounce) an already uploaded file
sub forward {
  my $file = shift;
  my ($nfile,$to,$AB);
  my ($filename,$keep);
  my (%to);

  http_die("no file data for <code>$file</code>") unless -f "$file/data";

  $keep = $::keep||$keep_default;
  if (my $mt = mtime("$file/data")) { $keep += int((time-$mt)/$DS) }

  if (@to) {

    # check recipients restriction
    check_rr($from,@to);

    # read aliases from address book
    if (open $AB,'<',"$from/\@ADDRESS_BOOK") {
      while (<$AB>) {
        s/#.*//;
        $_ = lc $_;
        if (s/^\s*(\S+)[=\s]+(\S+)//) {
          my ($alias,$address) = ($1,$2);
          foreach my $address (split(",",$address)) {
            $address .= '@'.$mdomain if $mdomain and $address !~ /@/;
            push @{$ab{$alias}},$address;
          }
        }
      }
      close $AB;
    }

    # collect addresses
    foreach my $to (my @loop = @to) {
      if ($ab{$to}) {
        foreach my $address (@{$ab{$to}}) {
          $to{$address} = $address;
        }
      } else {
        $to .= '@'.$mdomain if $mdomain and $to !~ /@/;
        $to{$to} = $to;
      }
    }

    @to = keys %to;

    http_header('200 OK');
    print html_header($head);

    foreach my $to (my @loop = @to) {
      $to =~ s/:\w+=.*//; # remove options from address
      $nfile = $file;
      $nfile =~ s:.*?/:$to/:;
      next if $nfile eq $file;
      mkdirp($nfile);
      http_die("cannot create directory $nfile") unless -d $nfile;
      unlink "$nfile/data",
             "$nfile/upload",
             "$nfile/download",
             "$nfile/autodelete",
             "$nfile/error",
             "$nfile/restrictions",
             "$nfile/keep",
             "$nfile/header",
             "$nfile/id",
             "$nfile/speed",
             "$nfile/comment",
             "$nfile/replyto",
             "$nfile/notify";
      if ($comment) {
        open $comment,'>',"$nfile/comment";
        print {$comment} $comment;
        close $comment;
      }
      if ($autodelete =~ /^(DELAY|NO|\d+)$/i) {
        symlink $autodelete,"$nfile/autodelete";
      }
      symlink          $keep,             "$nfile/keep";
                  copy("$file/id",        "$nfile/id");
                  copy("$file/ip",        "$nfile/ip");
                  copy("$file/speed",     "$nfile/speed");
                  copy("$file/replyto",   "$nfile/replyto");
      $filename = copy("$file/filename",  "$nfile/filename");
      link             "$file/data",      "$nfile/data"
        or die http_die("cannot create $nfile/data - $!");
      unless ($dkey = readlink("$nfile/dkey") and -l "$dkeydir/$dkey") {
        $dkey = randstring(8);
        unlink "$dkeydir/$dkey";
        symlink "../$nfile","$dkeydir/$dkey"
          or http_die("cannot symlink $dkeydir/$dkey");
        unlink "$nfile/dkey";
        symlink $dkey,"$nfile/dkey"
          or http_die("cannot create $nfile/dkey - $!");
      }

      if ($nomail or $nomail{$to}) {
        if ($filename) {
          my $url = "$durl/$dkey/".normalize_filename($filename);
          pq(qq(
            'Download-URL for $to:<br>'
            '<code>$url</code>'
            '<p>'
          ));
        }
      } else {
        notify_locale($dkey,'new');
        fuplog($to,urlencode($filename),"(forwarded)");
        if ($filename) {
          pq(qq(
            'File "$filename" copy-forwarded to $to and notified.'
            '<p>'
          ));
        }
      }
    }
    pq(qq(
      '<a href="/foc?akey=$akey">back to F*EX operation control</a>'
      '</body></html>'
    ));
  } else {
    $filename = filename($file);
    http_header('200 OK');
    print html_header($head);
    pq(qq(
      '<form name="upload"'
      '      action="/fup"'
      '      method="post"'
      '      accept-charset="UTF-8"'
      '      enctype="multipart/form-data">'
      '  <input type="hidden" name="akey"    value="$akey">'
      '  <input type="hidden" name="dkey"    value="$dkey">'
      '  <input type="hidden" name="command" value="FORWARD">'
      '  forward a copy of "<code>$filename</code>" to:<br>'
      '  <input type="text" name="to" size="80">'
      '</form>'
      '</body></html>'
    ));
  }
}


# modify file parameter
sub modify {
  my $file = shift;
  my $filename = filename($file);
  my $dkey = readlink "$file/$dkey";
  my $to;
  my @parameter;

  http_die("no file data for <code>$file</code>") unless -f "$file/data";

  $to = $file;
  $to =~ s:/.*::;
  if ($specific{'keep'}) {
    mksymlink("$file/keep",$keep);
    utime time,time,"$file/filename";
    push @parameter,'KEEP';
  }
  if ($specific{'autodelete'}) {
    mksymlink("$file/autodelete",$autodelete);
    push @parameter,'AUTODELETE';
  }
  if ($comment) {
    if (open $comment,'>',"$file/comment") {
      print {$comment} $comment;
      close $comment;
    }
    notify_locale($dkey,'new');
    push @parameter,'COMMENT';
  }
  http_header('200 OK');
  print "Parameter ".join(',',@parameter)." modified for $filename for $to\n";
}


sub calcsize {
  my ($tsize,$nsize) = @_;
  if ($tsize<2097152) {
    return sprintf "%d kB",int($nsize/1024);
  } else {
    return sprintf "%d MB",int($nsize/1048576);
  }
}


# set parameter variables
sub setparam {
  my ($v,$vv) = @_;
  my ($idf,$to);

  $v = uc(despace($v));

#  if ($vv =~ /([<>])/) {
#    http_die(sprintf("\"&#%s;\" is not allowed in parameter $v",ord($1)));
#  }

  $param{$v} = $vv;
  if ($v eq 'LOGOUT') {
    $logout = $v;
    # skey and gkey are persistant!
    $akey = $1 if $ENV{QUERY_STRING} =~ /AKEY:(\w+)/i;
    unlink "$akeydir/$akey";
    $login = $FEXHOME.'/cgi-bin/login';
    if (-x $login) {
      $login = readlink $login || 'login';
      nvt_print(
        "HTTP/1.1 302 Found",
        "Location: $ENV{PROTO}://$ENV{HTTP_HOST}/$login",
        'Content-Length: 0',
        ""
      );
    } else {
      nvt_print(
        "HTTP/1.1 302 Found",
        "Location: $ENV{PROTO}://$ENV{HTTP_HOST}/fup",
        'Content-Length: 0',
        ""
      );
    }
    &reexec;
  } elsif ($v eq 'LOCALE' and $vv =~ /^(\w+)$/) {
    $locale = $1;
  } elsif ($v eq 'REDIRECT' and $vv =~ /^([\w?=]+)$/) {
    $redirect = $1;
  } elsif ($v eq 'SKEY' and $vv =~ /^([\w:]+)/) {
    $skey = $1;
    $restricted = $v;
  } elsif ($v eq 'GKEY' and $vv =~ /^([\w:]+)/) {
    $gkey = $1 unless $nomail;
    $restricted = $v;
  } elsif ($v eq 'DKEY' and $vv =~ /^(\w+)/) {
    $dkey = $1;
  } elsif ($v eq 'AKEY' and $vv =~ /^(\w+)/) {
    $akey = $1;
  } elsif ($v eq 'FROM' or $v eq 'USER') {
    $from = normalize_email($vv);
    $from = untaint(expand($from));
    checkchars('from address',$from);
    # maybe FROM=SUBUSER !
    # checkaddress($from) or http_die("FROM $from is no legal e-mail address");
  } elsif ($v eq 'REPLYTO') {
    $replyto = normalize_email($vv);
    checkchars('replyto address',$replyto);
    checkaddress($replyto) or
      http_die("REPLYTO $replyto is no legal e-mail address");
  } elsif ($v eq 'ADDTO') {
    $vv =~ s/\s.*//;
    $addto = normalize_email($vv);
  } elsif ($v eq 'SUBMIT') {
    $submit = decode_utf8(normalize($vv));
  } elsif ($v eq 'FEXYOURSELF') {
    $submit = $vv;
    @to = ($from);
    $specific{'autodelete'} = $autodelete = 'no';
  } elsif ($v eq 'TO') {
    # extract AUTODELETE and KEEP options
    if ($vv =~ s/[\s,]+AUTODELETE=(\w+)//i) {
      $specific{'autodelete'} = $autodelete = uc($1);
    }
    if ($vv =~ s/[\s,]+KEEP=(\d+)//i) {
      $keep = $1;
      $keep = $keep_max if $keep_max and $keep > $keep_max;
      $specific{'keep'} = $keep;
    }
    $to	= normalize(lc($vv));
    $to	=~ s/[\n\s;,]+/,/g;
    if ($from) {
      if ($to eq '.') {
        $to = $from;
         unless ($specific{'autodelete'}) {
           $specific{'autodelete'} = $autodelete = 'no';
         }
      }
      if ($to eq '//') {
        $to = $from;
        unless ($specific{'autodelete'}) {
          $specific{'autodelete'} = $autodelete = 'no';
        }
        $comment = '//';
      }
    }
    checkchars('to address',$to);
    push @to,split(',',$to);
  } elsif ($v eq 'ID') {
    $id	= despace($vv);
    checkchars('auth-ID',$id);
  } elsif ($v eq 'TCE') {
    $test = despace($vv);
  } elsif ($v eq 'OKEY' and $vv =~ /^(\w+)$/) {
    $okey = $1;
    $restricted = $v;
  } elsif ($v eq 'FILEID' and $vv =~ /^(\w+)$/) {
    $fileid = $1;
  } elsif ($v eq 'CONTENTLENGTH' and $vv =~ /^(\d+)$/) {
    $contentlength = $1;
  } elsif ($v eq 'FILE' or $v eq 'FILENAME') {
    $file = strip_path(normalize($vv));
  } elsif ($v eq 'UID' and $vv =~ /^(\w+)$/) {
    $uid = $1;
  } elsif ($v eq 'ID_FORGOTTEN') {
    $id_forgotten = $vv;
  } elsif ($v eq 'SHOWSTATUS' and $vv =~ /^(\w+)$/) {
    $showstatus = $uid = $1;
  } elsif ($v eq 'COMMENT') {
    $comment = decode_utf8(normalize($vv));
    $comment =~ s/^\s*!\.!/!SHORTMAIL!/;
    $comment =~ s/^!#!/!NOMAIL!/;
    $comment =~ s/^!-!/!NOSTORE!/;
    $nomail = $comment if $comment =~ /NOMAIL/;
    $nostore = $nomail = $comment if $comment =~ /NOSTORE/;
    $bcc .= " $from"   if $comment =~ s/\s*!bcc!?\s*//i;
    # backward compatibility
    foreach my $cmd (qw(
      DELETE LIST CHECKQUOTA CHECKRECIPIENT RECEIVEDLOG SENDLOG FOPLOG FORWARD
    )) { $command = $comment if $comment eq $cmd }
  } elsif ($v eq 'COMMAND') {
    $command = normalize($vv);
  } elsif ($v eq 'BWLIMIT' and $vv =~ /^(\d+)$/) {
    $bwlimit = $1;
  } elsif ($v eq 'SEEK' and $vv =~ /^(\d+)$/) {
    $seek = $1;
  } elsif ($v eq 'FILESIZE' and $vv =~ /^(\d+)$/) {
    $filesize = $1; # complete filesize!
    &check_space($filesize-$seek);
  } elsif ($v eq 'AUTODELETE' and $vv =~ /^(\w+)$/) {
    $specific{'autodelete'} = $autodelete = uc($1);
  } elsif ($v eq 'KEEP' and $vv =~ /^(\d+)$/) {
    $keep = $1;
    $keep = $keep_max if $keep_max and $keep > $keep_max;
    $specific{'keep'} = $keep;
  } elsif ($v eq 'TIMEOUT' and $vv =~ /^(\d+)$/) {
     $specific{'timeout'} = $timeout = $1;
  }
}


sub id_forgotten {
  my ($id,$to,$subuser,$gm,$skey,$gkey,$url,$fup);

  return if $nomail;

  $fup = $durl;
  $fup =~ s:/fop:/fup:;

  # full user
  if (open $from,'<',"$from/\@") {
    $id = getline($from);
    close $from;
  }
  if ($id) {
    $url = "$fup/".b64("from=$from&id=$id");
    mail_forgotten($from,qqq(qq(
      'Your reqested F*EX auth-ID for $fup?from=$from is:'
      '$id'
      ''
      'Or use:'
      '$url'
    )));
    exit;
  }

  # sub user
  foreach my $skey (glob("$skeydir/*")) {
    if (-f $skey and open $skey,'<',$skey) {
      while (<$skey>) {
        $_ = lc;
        if (/^(\w+)=(.+)/) {
          $subuser = $2 if $1 eq 'from';
          $to	   = $2 if $1 eq 'to';
        }
      }
      close $skey;
    }
    if ($from and $to and $from eq $subuser) {
      $skey =~ s:.*/::;
      mail_forgotten($subuser,qqq(qq(
        'Your reqested F*EX login is:'
        ''
        '$fup?skey=$skey'
      )));
      exit;
    }
  }

  # group user
  foreach my $gkey (glob("$gkeydir/*")) {
    if (-f $gkey and open $gkey,'<',$gkey) {
      while (<$gkey>) {
        $_ = lc;
        if (/^(\w+)=(.+)/) {
          $gm = $2 if $1 eq 'from';
          $to = $2 if $1 eq 'to';
        }
      }
      close $gkey;
    }
    if ($gm and $to and $from eq $gm) {
      $gkey =~ s:.*/::;
      mail_forgotten($gm,qqq(qq(
        'Your reqested F*EX login is:'
        ''
        '$fup?gkey=$gkey'
      )));
      exit;
    }
  }
  http_die("<code>$from</code> is not a F*EX user on this server");
}


sub mail_forgotten {
  my $user = shift;
  my @msg = @_;
  local *P;

  return if $nomail;

  open P,'|-',$sendmail,$user,$bcc or http_die("cannot start sendmail - $!\n");
  pq(P,qq(
    'From: $admin'
    'To: $user'
    'Subject: F*EX service $hostname'
    'X-Mailer: F*EX'
    ''
  ));
  print P @msg;
  close P or http_die("cannot send mail - $!\n");
  http_header('200 OK');
  print html_header($head);
  print "<h3>Mail has been sent to you ($from)</h3>\n";
  print "</body></html>\n";
}


# lookup akey, skey and gkey (full and sub user and group)
sub check_keys {

  if (@to and "@to" ne '_') {
    http_die("you cannot mix TO and SKEY URL parameters") if $skey;
    http_die("you cannot mix TO and GKEY URL parameters") if $gkey;
  }

  # only one key can be valid
  $akey = $gkey = '' if $skey;
  $akey = $skey = '' if $gkey;

  if ($skey) {
    # encrypted SKEY?
    if ($skey =~ s/^MD5H:(.+)/$1/) {
      # search real SKEY
      foreach my $s (glob "$skeydir/*") {
        $s =~ s:.*/::;
        if ($skey eq md5_hex($s.$sid)) {
          $skey = $s;
          last;
        }
      }
    }
    if (open $skey,'<',"$skeydir/$skey") {
      $akey = $gkey = '';
      while (<$skey>) {
        if (/^(\w+)=(.+)/) {
          $from = $2          if lc($1) eq 'from';
          @to = ($muser = $2) if lc($1) eq 'to';
          $rid = $id = $2     if lc($1) eq 'id';
        }
      }
      close $skey;
    } else {
      # $skey = '';
      http_die("invalid SKEY <code>$skey</code>");
    }
  }

  if ($gkey) {
    # encrypted GKEY?
    if ($gkey =~ s/^MD5H:(.+)/$1/) {
      # search real GKEY
      foreach my $g (glob "$gkeydir/*") {
        $g =~ s:.*/::;
        if ($gkey eq md5_hex($g.$sid)) {
          $gkey = $g;
          last;
        }
      }
    }
    if (open $gkey,'<',"$gkeydir/$gkey") {
      $akey = $skey = '';
      while (<$gkey>) {
        if (/^(\w+)=(.+)/) {
          $from        = $2 if lc($1) eq 'from';
          $to = $muser = $2 if lc($1) eq 'to';
          $rid = $id   = $2 if lc($1) eq 'id';
          # $user      = $2 if lc($1) eq 'user';
        }
      }
      close $gkey;
      @to = ($to);
    } else {
      # $gkey = '';
      http_die("invalid GKEY <code>$gkey</code>");
    }
  }

  if ($akey and not $id) {
    my $idf;

    # sid is not set with web browser
    # akey with sid is set with schwuppdiwupp & co
    $idf = "$akeydir/$akey/@";

    if (open $idf,'<',$idf and $id = getline($idf)) {
      close $idf;
      $from = readlink "$akeydir/$akey"
        or http_die("internal server error: no $akey symlink");
      $from =~ s:.*/::;
      $from = untaint($from);
      if ($akey ne md5_hex("$from:$id")) {
        $from = $id = '';
      }
    } else {
      $akey = '';
    }
  }

}


# check if there is enough space on spool
sub check_space {
  my $req = shift;
  my ($df,$free,$uprq);
  local *P;

  if (open $df,"df -k $spooldir|") {
    while (<$df>) {
      if (/^.+?\s+\d+\s+\d+\s+(\d+)/ and $req/1024 > $1) {
        $free = int($1/1024);
        $uprq = int($req/$MB);
        if (not $nomail and open P,"|$sendmail -t") {
          pq(P,qq(
            'From: $admin'
            'To: $admin'
            'Subject: F*EX spool out of space'
            ''
            'F*EX spool $spooldir on $ENV{SERVER_NAME} is out of space.'
            ''
            'Current free space: $free MB'
            'Upload request: $uprq MB'
          ));
          close P;
        }
        debuglog("aborting because not enough free space in spool ($free MB)");
        http_die("not enough free space for this upload");
      }
    }
    close $df;
  }
}


# global substitution as a function like in gawk
sub gsub {
  local $_ = shift;
  my ($p,$r) = @_;
  s/$p/$r/g;
  return $_;
}


# standard log
sub fuplog {
  my $msg = "@_";

  $msg =~ s/\n/ /g;
  $msg =~ s/\s+$//;
  $msg = sprintf "%s [%s_%s] %s (%s) %s\n",
                 isodate(time),$$,$ENV{REQUESTCOUNT},$from,$fra,$msg;
  writelog($log,$msg);
}


sub sigdie {
  local $_ = shift;
  chomp;
  sigexit('DIE',$_);
}


sub sigexit {
  my ($sig) = @_;
  my $msg;
  my $to = join(',',@to);

  $SIG{__DIE__} = 'DEFAULT';
  foreach (keys %SIG) { $SIG{$_} = 'DEFAULT' }

  $msg = @_ ? "@_" : '???';
  $msg =~ s/\n/ /g;
  $msg =~ s/\s+$//;
  $msg = sprintf "%s %s (%s) %s %s caught SIGNAL %s %s\n",
                 isodate(time),
                 $from||'-',
                 $fra||'-',
                 $to||'-',
                 encode_Q($file||'-'),
                 $msg,
                 $RB?"(after $RB bytes)":"";

  writelog($log,$msg);

  if ($sig eq 'DIE') {
    shift;
    die "$msg\n";
  } else {
    die "SIGNAL $msg\n";
  }
}


sub present_locales {
  my $url = shift;
  my @locales = @::locales; # from fex.ph
  my ($locale,$lang);

  if ($url =~ /\?/) {
    $url .= "&";
    $url =~ s/locale=\w+&//g;
  } else {
    $url .= "?";
  }

  if (@locales) {
    map { $_ = "$FEXHOME/locale/$_" } @locales;
  } else {
    @locales = glob "$FEXHOME/locale/*";
  }

  if (@locales > 1) {
    print "<h3>";
    foreach my $locale (my @loop = @locales) {
      if (-x "$locale/cgi-bin/fup") {
        $lang = "$locale/lang.html";
        $locale =~ s:.*/::;
        if (open $lang,'<',$lang and $lang = getline($lang)) {
          close $lang;
        } else {
          $lang = $locale;
        }
        print "<a href=\"${url}locale=$locale\">$lang</a> ";
      }
    }
    print "</h3>\n";
  }
}


sub check_camel {
  my ($logo,$camel);
  local $/;

  if (open $logo,"$docdir/logo.jpg") {
    $camel = md5_hex(<$logo>) eq 'ad8a95bba8dd1a61d70bd38611bc2059';
  }
  if ($camel and open $logo,"$docdir/action-fex-camel.gif") {
    $camel = md5_hex(<$logo>) eq '1f3d7acc70377496f95c5adddaf4ca7b';
  }
  http_die("Missing camel") unless $camel;
}