#!/usr/bin/perl -w

# CLI client for the FEX service for retrieving files
#
# see also: fexsend
#
# Author: Ulli Horlacher <framstag@rus.uni-stuttgart.de>
#
# Perl Artistic Licence

use 5.006;
use strict qw'vars subs';
use Config;
use POSIX;
use Encode;
use Cwd 'abs_path';
use Getopt::Std;
use File::Basename;
use Socket;
use IO::Handle;
use IO::Socket::INET;
use Time::HiRes 'time';
use constant k => 2**10;
use constant M => 2**20;

eval 'use Net::INET6Glue::INET_is_INET6';

$| = 1;

our $SH;
our ($fexhome,$idf,$tmpdir,$windoof,$useragent);
our ($xv,%autoview);
our $bs = 2**16; # blocksize for tcp-reading and writing file
our $version = 20160919;
our $CTYPE = 'ISO-8859-1';
our $fexsend = $ENV{FEXSEND} || 'fexsend';
our $DEBUG = $ENV{DEBUG};
our $_0 = $0;

my %SSL = (SSL_version => 'TLSv1');
my $sigpipe;

# inquire default character set
# cannot use "use I18N::Langinfo" because of no windows support!
eval {
  local $^W = 0;
  require I18N::Langinfo;
  I18N::Langinfo->import(qw'langinfo CODESET');
  $CTYPE = langinfo(CODESET());
};

if ($Config{osname} =~ /^mswin/i) {
  $windoof = $Config{osname};
  $ENV{HOME} = $ENV{USERPROFILE};
  $fexhome = $ENV{FEXHOME} || $ENV{HOME}.'/fex';
  $tmpdir = $ENV{FEXTMP} || $ENV{TMP} || "$fexhome/tmp";
  $idf = "$fexhome/id";
  $useragent = sprintf("fexget-$version (%s %s)",
                       $Config{osname},$Config{archname});
  $SSL{SSL_verify_mode} = 0;
  chdir $ENV{USERPROFILE}.'\Desktop';
  # open XX,'>XXXXXX';close XX;
} elsif ($Config{osname} =~ /^darwin/i or $ENV{MACOS}) {
  $0 =~ s:(.*)/:: and $ENV{PATH} .= ":$1";
  $fexhome = $ENV{FEXHOME} || $ENV{HOME}.'/.fex';
  $tmpdir = $ENV{FEXTMP} || $ENV{TMPDIR} || "$fexhome/tmp";
  $idf = "$fexhome/id";
  $_ = `sw_vers -productVersion 2>/dev/null`||'';
  chomp;
  $useragent = "fexget-$version (MacOS $_)";
} else {
  $0 =~ s:(.*)/:: and $ENV{PATH} .= ":$1";
  $fexhome = $ENV{FEXHOME} || $ENV{HOME}.'/.fex';
  $tmpdir = $ENV{FEXTMP} || "$fexhome/tmp";
  $idf = "$fexhome/id";
  $_ = `(lsb_release -d||uname -a)2>/dev/null`||'';
  chomp;
  s/^Description:\s+//;
  $useragent = "fexget-$version ($_)";
}

if (-f ($_ = '/etc/fex/config.pl')) {
  eval { require } or warn $@;
}

my $usage = <<EOD;
usage: $0 [-v] [-m limit] [-s filename] [-o] [-k] [-X] [-P proxy:port] F*EX-URL(s)
   or: $0 [-v] -d F*EX-URL(s)
   or: $0 [-v] -f F*EX-URL(s) e-mail-address
   or: $0 [-v] -a
   or: $0 -l [-i tag]
   or: $0 -H
   or: $0 -V
options: -v verbose mode
         -m limit kB/s
         -s save to filename (-s- means: write to STDOUT/pipe)
         -o overwrite existing file
  	 -k keep on server after download
  	 -X do not extract archive files or autoview file
  	 -d delete without download
  	 -f forward a file to another recipient
         -a get all files (implies -X)
  	 -l list files on server
         -i tag alternate server/account, see: $fexsend -h
         -P use Proxy for connection to the F*EX server
         -H show hints and examples
         -V show version and ask for upgrade
argument: F*EX-URL may be file number (see: $0 -l)
EOD

my $hints = <<'EOD';
When you download a file with extension .jpg .gif .png or .tif an image viewer
will be started. This can be xv or xdg-open.
In $HOME/.fex/config.pl you can set your prefered autoview applications:

%autoview = (
  '\.(gif|jpg|png|tiff?)' => 'my_prefered_image_viewer',
  '\.(avi|mp4|mov)'       => 'vlc -f',
  '\.pdf'                 => 'evince',
);

For HTTPS you can set the environment variables:
SSLVERIFY=1                 # activate server identity verification
SSLVERSION=TLSv1            # this is the default
SSLCAPATH=/etc/ssl/certs    # path to trusted (root) certificates
SSLCAFILE=/etc/ssl/cert.pem # file with trusted (root) certificates
SSLCIPHERLIST=HIGH:!3DES    # see http://www.openssl.org/docs/apps/ciphers.html

You can set these environment variables also in $HOME/.fex/config.pl, as well as
the $opt_* variables, e.g.:

$ENV{SSLVERSION} = 'TLSv1';
${'opt_+'} = 1;
$opt_m = 200;
EOD

if ($windoof and not @ARGV and not $ENV{PROMPT}) {
  # restart with cmd.exe to have mouse cut+paste
  my $cmd = "cmd /k \"$0\"";
  # print "$cmd\n";
  exec $cmd;
  exit;
}

my $atype = '\.(tgz|tar|zip|7z)$';
my $proxy = '';
my $proxy_prefix = '';
my $chunksize;

our ($opt_h,$opt_v,$opt_l,$opt_d,$opt_m,$opt_z,$opt_K,$opt_o,$opt_a);
our ($opt_s,$opt_k,$opt_i,$opt_V,$opt_X,$opt_f,$opt_P,$opt_L,$opt_H);
$opt_m = $opt_h = $opt_v = $opt_l = $opt_d = $opt_K = $opt_o = $opt_a = 0;
$opt_V = $opt_X = $opt_f = $opt_L = $opt_H = 0;
${'opt_+'} = 0;
$opt_s = $opt_k = $opt_i = $opt_P = '';
$_ = "$fexhome/config.pl"; require if -f;
getopts('hvVHlLdkzoaXVf+m:s:i:K:P:') or die $usage;
$opt_k = '?KEEP' if $opt_k;

if ($opt_m =~ /(\d+)/) {
  $opt_m = $1
} else {
  $opt_m = 0
}

if ($opt_V) {
  print "Version: $version\n";
  unless (@ARGV) {
    print "Upgrade fexget? ";
    $_ = <STDIN>||'';
    if (/^y/i) {
      my $new = `wget -nv -O- http://fex.belwue.de/download/fexget`;
      my $newversion = $1 if $new =~ /version = (\d+)/;
      if ($new !~ /upgrade fexget/ or not $newversion) {
        die "$0: bad update\n";
      }
      if ($newversion <= $version) {
        die "$0: no newer version\n";
      }
      $_0 = abs_path($_0);
      system qw'rsync -a',$_0,$_0.'_old';
      exit $? if $?;
      open $_0,'>',$_0 or die "$0: cannot write $_0. - $!\n";
      print {$_0} $new;
      close $_0;
      exec $_0,qw'-V .';
    }
  }
  exit;
  exit if "@ARGV" eq '.';
}

die $usage                  if $opt_h;
if ($opt_H) {
  print $hints;
  exit;
}

&get_ssl_env;

my $ffl = "$tmpdir/fexget"; 		# F*EX files list (cache)

my @rcamel = (
'
 (_*p _  _
   \\\\/ \/ \\
    \  __  )=*
    //\\\\//\\\\
',
"     \\\\/\\\\/ \n",
"    //\\\\//\\\\\n"
);

# get fexlog
if ($opt_z) {
  my $cmd = "$fexsend -Z";
  $cmd .= " -i $opt_i" if $opt_i;
  warn "$cmd\n" if $opt_v;
  exec $cmd;
  die "$0: cannot run $cmd : $!\n";
}

if ($opt_l) {
  &list;
  exit;
}

if ($opt_L) {
  my $cmd = "$fexsend -L";
  $cmd .= " -i $opt_i" if $opt_i;
  warn "$cmd\n" if $opt_v;
  exec $cmd;
  die "$0: cannot run $cmd : $!\n";
}

if ($opt_P) {
  if ($opt_P =~ /^([\w.-]+:\d+)(:(\d+))?/) {
    $proxy = $1;
    $chunksize = $3 || 0;
  } else {
    die "$0: proxy must be: SERVER:PORT\n";
  }
}

if ($opt_a) {
  $opt_X = $opt_a;
  die $usage if @ARGV;
  &list;
  print "\n";
  if (open $ffl,$ffl) {
    while (<$ffl>) {
      push @ARGV,$1 if /^\s+(\d+)/;
    }
    close $ffl;
  }
} else {
  unless (@ARGV) {
    if ($windoof) {
      my $url;
      for (;;) {
        print "download-URL: ";
        chomp($url = <STDIN>);
        if ($url =~ /^http/) {
          @ARGV = ($url);
          last;
        }
      }
    } else {
      die $usage;
    }
  }
}

my ($file,%files,$download,$server,$port,$fop,$https);

if ($opt_f) {
  unless ($ENV{FEXID} or -f $ENV{HOME}.'/.fex/id') {
    die "$0: no local FEXID\n";
  }
  $opt_f = pop(@ARGV);
  if ($opt_f =~ /^\d+$|^https?:/) {
    die "$0: $opt_f is not an e-mail address\n";
  }
}

URL: foreach my $url (@ARGV) {

  # do not overrun server
  sleep 1 if $fop;

  if ($url !~ /^http/) {
    unless (%files) {
      open $ffl,$ffl or die "$0: no $ffl, use first: $0 -l\n";
      my $from = '';
      while (<$ffl>) {
        if (/^from (.+) :$/) {
          $from = $1;
        } elsif (/^\s*(\d+)\)\s+\d+ MB.* (http\S+)/) {
          push @{$files{all}},$2;
          push @{$files{$from}},$2;
        }
      }
      close $ffl;
    }

    if ($url =~ /^(\d+)$/) {
      $url = ${files{all}}[$1-1] or die "$0: unknown file number\n";
    }
  }

  if ($url =~ m{^http(s?)://([\w\.\-]+)(:(\d+))?(/.*fop/\S+)}) {
    $https  = $1;
    $server = $2;
    $port   = $4 || ($1?443:80);
    $fop    = $5;
  } else {
    die "$0: unknown F*EX URL $url\n";
  }

  if ($proxy) {
    if    ($port == 80)   { $proxy_prefix = "http://$server" }
    elsif ($port == 443)  { $proxy_prefix = "" }
    else                  { $proxy_prefix = "http://$server:$port" }
  }

  serverconnect($server,$port);

  if ($opt_f) {
    forward($url);
    next;
  }

  if ($opt_d) {
    my @r = del($url);
    $_ = shift @r;
    if (/^HTTP.* 200/) {
      ($file) = grep { $_ = $1 if /^X-File:\s+(.+)/ } @r;
      $file = $url unless $file;
      $file =~ s:.*/::;
      printf "%s deleted\n",locale(decode_utf8(urldecode($file)));
    } else {
      s:HTTP/[\d\. ]+::;
      die "$0: server response: $_";
    }
    next;
  }

  if ($opt_K) {
    my @r = keep($url);
    $_ = shift @r;
    if (/^HTTP.* 200/) {
      $file = $url;
      $file =~ s:.*/::;
      print "$file kept\n";
    } else {
      s:HTTP/[\d\. ]+::;
      die "$0: server response: $_";
    }
    next;
  }

  $download = download($server,$port,$fop);
  exit if $opt_s eq '-';
  unlink $download unless -s $download;
  exit 2 unless -f $download;

  if ($windoof) {
    print "READY\n";
    exit;
  }

  if (not $opt_X and $download =~ /\.gpg$/) {
    if (-t) {
      print "decrypt \"$download\"? ";
      $_ = <STDIN>||'y';
      unless (/^[y\n]/i) {
        print "keeping \"$download\"\n";
        exit;
      }
    }
    if (system('gpg',$download) == 0) {
      unlink $download;
      $download =~ s/\.gpg$//;
    }
  }

  unless ($opt_X) {

    foreach my $a (keys %autoview) {
      if ($download =~ /$a$/i and $autoview{$a}) {
        printf "run \"%s %s\" [Yn] ? ",$autoview{$a},basename($download);
        $_ = <STDIN>||'';
        system sprintf("%s %s",$autoview{$a},quote($download)) if /^y|^$/i;
        next URL;
      }
    }

    if ($ENV{DISPLAY} and $download =~ /\.(gif|jpg|png|tiff?)$/i) {
      # see also mimeopen and xdg-mime
      # http://unix.stackexchange.com/questions/144047/how-does-xdg-open-do-its-work
      if (my $xv = $xv || pathsearch('xv') || pathsearch('xdg-open')) {
        printf "run \"%s %s\" [Yn] ? ",basename($xv),basename($download);
        $_ = <STDIN>||'';
        system $xv,$download if /^y|^$/i;
        next URL;
      }
    }

    if ($download =~ /$atype/) {
      if    ($download =~ /\.(tgz|tar.gz)$/) { extract('tar tvzf','tar xvzf') }
      elsif ($download =~ /\.tar$/)          { extract('tar tvf','tar xvf') }
      elsif ($download =~ /\.zip$/i)         { extract('unzip -l','unzip') }
      elsif ($download =~ /\.7z$/i)          { extract('7z l','7z x') }
      else { die "$0: unknown archive \"$download\"\n" }
      if ($? == 0) {
        unlink $download;
      } else {
        die "$0: keeping \"$download\"\n";
      }
    }
  }

}

exit;

sub extract {
  my $l = shift;
  my $x = shift;
  my $d = $download;
  my $xd = '';
  local $_;

  if (-t and not $windoof) {
    print "Files in archive:\n";
    system(split(' ',$l),$download);
    $d =~ s:.*/:./:;
    $d =~ s/\.[^.]+$//;
    $d =~ s:/*$:/:;
    for (;;) {
      $xd = inquire("extract to directory (Ctrl-C to keep archive): ",$d);
      last if $xd =~ s:^(\./*)*!?$::;
      if ($xd eq '-') {
        print "keeping $download\n";
        exit;
      }
      if ($xd !~ s/!$//) {
        if (-d $xd) {
          print "directory $xd does already exist, add \"!\" to overwrite\n";
          redo;
        }
        unless (mkdir $xd) {
          print "cannot mkdir $xd - $!\n";
          redo;
        }
      }
      unless (chdir $xd) {
        print "cannot chdir $xd - $!\n";
        redo;
      }
      last;
    }
  }
  print "extracting to $xd :\n" if $xd;
  system(split(' ',$x),$download);
  print "extracted to $xd\n" if $xd;
}

sub del {
  my $url = shift;
  my ($server,$port);
  my $del;
  my @r;

  if ($url =~ m{^http(s?)://([\w\.\-]+)(:(\d+))?(/fop/.+)}) {
    $server = $2;
    $port   = $4 || ($1?443:80);
    $del    = $5.'?DELETE';
  } else {
    die "$0: unknown F*EX URL $url\n";
  }

  sendheader("$server:$port","GET $del HTTP/1.1","User-Agent: $useragent");
  while (<$SH>) {
    s/\r//;
    last if /^\n/; # ignore HTML output
    warn "<-- $_" if $opt_v;
    push @r,$_;
  }
  die "$0: no response from fex server $server\n" unless @r;
  return @r;
}


sub forward {
  my $url = shift;
  my ($server,$port);
  my ($uri,$dkey,$list,$cmd,$n,$copy);
  my @r;

  if ($url =~ m{^http(s?)://([\w\.\-]+)(:(\d+))?(/fop/.+)}) {
    $server = $2;
    $port   = $4 || ($1?443:80);
    $uri    = $5;
  } else {
    die "$0: unknown F*EX URL $url\n";
  }

  sendheader(
    "$server:$port",
    "GET $uri?COPY HTTP/1.1",
    "User-Agent: $useragent",
  );

  $_ = <$SH>;
  die "$0: no reply from fex server $server\n" unless $_;
  warn "<-- $_" if $opt_v;

  if (/^HTTP.*already exists/) {
    if ($uri =~ m:/fop/(\w+)/:) {
      $dkey = $1;
    }
  } elsif (/^HTTP.*200/) {
    # ok!
  } else {
    s/^HTTP.... \d+ //;
    die "$0: $_";
  }

  while (<$SH>) {
    s/\r//;
    last if /^\n/; # ignore HTML output
    $dkey = $1 if /^Location:.*\/(\w+)\/.+/;
    warn "<-- $_" if $opt_v;
  }

  print "fexsend -l\n" if $opt_v;
  system 'fexsend -l >/dev/null 2>&1';
  $list = $ENV{HOME}.'/.fex/tmp/fexlist';
  open $list,$list or die "$0: cannot open $list - $!\n";
  while (<$list>) {
    if (/^\s+(\d+)\) (\w+)/ and $2 eq $dkey) {
      $n = $1;
      $cmd = "fexsend -b $n $opt_f";
      print "$cmd\n" if $opt_v;
      system $cmd;
      last;
    }
  }
  close $list;

  if ($n) {
    $cmd = "fexsend -d $n >/dev/null 2>&1";
    print "$cmd\n" if $opt_v;
    system $cmd;
  } else {
    warn "$0: forwarding failed\n";
  }
}


sub keep {
  my $url = shift;
  my ($server,$port);
  my $keep;
  my (@hh,@r);

  if ($url =~ m{^http(s?)://([\w\.\-]+)(:(\d+))?(/fop/.+)}) {
    $server = $2;
    $port   = $4 || ($1?443:80);
    $keep    = "$5?KEEP=$opt_K";
  } else {
    die "$0: unknown F*EX URL $url\n";
  }

  push @hh,"GET $keep HTTP/1.1",
           "Host: $server:$port",
           "User-Agent: $useragent",
           "";

  foreach (@hh) {
    warn $_,"\n" if $opt_v;
    print $SH $_,"\r\n";
  }
  while (<$SH>) {
    s/\r//;
    last if /^\n/;
    push @r,$_;
  }
  die "$0: no response from fex server $server\n" unless @r;
  grep { warn "\t$_" } @r if $opt_v;
  return @r;
}


sub download {
  my ($server,$port,$fop,$nocheck) = @_;
  my ($file,$download,$ssl,$pipe,$filesize,$checkstorage,$dkey);
  my (@hh,@r);
  my ($t0,$t1,$t2,$tt,$tm,$ts,$kBs,$b,$bt,$tb,$B,$buf);
  my $length = 0;
  my $seek = 0;
  my $tc = 0;
  local $_;
  local *X;

  if ($opt_s) {
    $file = $opt_s;
    if ($opt_s eq '-') {
      $pipe = $download = $opt_s;
    } elsif (-p $opt_s or -c $opt_s) {
      $download = $opt_s;
      $nocheck = 'pipe or character device';
    } else {
      $download = $file.'.tmp';
      $seek = -s $download || 0;
    }
  } else {
    # ask server for real file name
    sendheader(
      "$server:$port",
      "HEAD $proxy_prefix$fop HTTP/1.1",
      "User-Agent: $useragent"
    );
    my $reply = $_ = <$SH>;
    unless (defined $_ and /\w/) {
      die "$0: no response from server\n";
    }
    warn "<-- $_" if $opt_v;
    unless (/^HTTP\/[\d.]+ 200/) {
      s:HTTP/[\d. ]+::;
      die "$0: server response: $_";
    }
    while (<$SH>) {
      s/\r//;
      warn "<-- $_" if $opt_v;
      last if /^\r?\n/;
      if (/^Content-Disposition: attachment; filename="(.+)"/i) {
        $file = locale(decode_utf8($1));
          $file =~ s:.*/::;
      }
    }
    unless ($file) {
      $file = $fop;
      $file =~ s:.*/::;
    }
    $download = $file.'.tmp';
    $seek = -s $download || 0;
  }

  $fop =~ m:/fop/(\w+)/: and $dkey=$1 or $dkey='';

  push @hh,"GET $proxy_prefix$fop$opt_k HTTP/1.1",
           "User-Agent: $useragent",
           "Cookie: dkey=$dkey",
           "Connection: close";
  push @hh,"Range: bytes=$seek-" if $seek;

  # HTTPS needs a new connection for actually downloading the file
  serverconnect($server,$port) if $opt_P and $port == 443;
  sendheader("$server:$port",@hh);
  $_ = <$SH>;
  die "$0: no response from fex server $server\n" unless $_;
  s/\r//;

  if (/^HTTP\/[\d.]+ 2/) {
    warn "<-- $_" if $opt_v;
    while (<$SH>) {
      s/\r//;
      warn "<-- $_" if $opt_v;
      last if /^\r?\n/;
      if (/^Content-length:\s*(\d+)/i) {
        $length = $1;
      } elsif (/^X-Size: (\d+)/i) {
        $filesize = $1;
      }
    }
  } else {
    s/HTTP\/[\d.]+ \d+ //;
    die "$0: bad server reply: $_";
  }

  if ($pipe) {
    *X = *STDOUT;
  } else {
    if ($opt_s and $opt_s eq $download) {
      open X,'>',$download or die "$0: cannot write to \"$download\" - $!\n";
      $checkstorage = $filesize unless $nocheck;
    } else {
      if (-e $file and not $opt_o) {
        die "$0: destination file \"$file\" does already exist\n";
      }
      if ($seek) {
        open X,'>>',$download or die "$0: cannot write to \"$download\" - $!\n";
      } else {
        open X,'>',$download or die "$0: cannot write to \"$download\" - $!\n";
        $checkstorage = $filesize unless $nocheck;
      }
    }
    if ($checkstorage and not $nocheck) {
      my $t0 = my $t1 = my $t2 = time;
      my $n = 0;
      my $buf = '.' x M;
      my $storagetest = $file.'.test';
      my $error = "$0: cannot write \"$storagetest\"";
      open $storagetest,'>',$storagetest or die "$error - $!\n";
      print STDERR "checking storage...\r";
      while (-s $storagetest < $checkstorage) {
        syswrite $storagetest,$buf or do {
          unlink $storagetest;
          die "\n$error - $!\n";
        };
        $n++;
        $t2 = int(time);
        if ($t2 > $t1) {
          print STDERR "checking storage... ".$n." MB\r";
          $t1 = $t2;
        }
      }
      close $storagetest or do {
        unlink $storagetest;
        die "\n$error - $!\n";
      };
      print STDERR "checking storage... ".$n." MB ok!\n";
      unlink $storagetest;
      if (time-$t0 > 25) {
        # retry after timeout
        serverconnect($server,$port);
        return(download($server,$port,$fop,'nocheck'))
      }
    }
  }

  $t0 = $t1 = $t2 = int(time);
  $tb = $B = 0;
  printf STDERR "resuming at byte %s\n",$seek if $seek;
  print $rcamel[0] if ${'opt_+'};
  while ($B < $length and $b = read $SH,$buf,$bs) {
    syswrite X,$buf;
    $B += $b;
    $tb += $b;
    $bt += $b;
    $t2 = time;
    if (${'opt_+'} and int($t2*10)>$tc) {
      print $rcamel[$tc%2+1];
      $tc = int($t2*10);
    }
    if (int($t2) > $t1) {
      $kBs = int($bt/k/($t2-$t1));
      $kBs = int($tb/k/($t2-$t0)) if $kBs < 10;
      $t1 = $t2;
      $bt = 0;
      # smaller block size is better on slow links
      $bs = 4096 if $bs>4096 and $tb/($t2-$t0)<65536;
      if ($tb<10*M) {
        printf STDERR "%s: %d kB (%d%%) %d kB/s \r",
                      $download,
                      int(($tb+$seek)/k),
                      int(($tb+$seek)/($length+$seek)*100),
                      $kBs;
      } else {
        printf STDERR "%s: %d MB (%d%%) %d kB/s        \r",
                      $download,
                      int(($tb+$seek)/M),
                      int(($tb+$seek)/($length+$seek)*100),
                      $kBs;
      }
    }
    if ($opt_m) {
      if ($t2 == $t0 and $B > $opt_m*k) {
        print "\nsleeping...\r" if $opt_v;
        sleep 1;
      } else {
        while ($t2 > $t0 and $tb/k/($t2-$t0) > $opt_m) {
          print "\nsleeping...\r" if $opt_v;
          sleep 1;
          $t2 = time;
        }
      }
    }
  }
  close $SH;
  close X;

  print $rcamel[2] if ${'opt_+'};

  $tt = $t2-$t0;
  $tm = int($tt/60);
  $ts = $tt-$tm*60;
  $kBs = int($tb/k/($tt||1));
  if ($seek) {
    printf STDERR "$file: %d MB, last %d MB in %d s (%d kB/s)      \n",
                  int(($tb+$seek)/M),int($tb/M),$tt,$kBs;
  } else {
    printf STDERR "$file: %d MB in %d s (%d kB/s)      \n",
                  int($tb/M),$tt,$kBs;
  }

  if ($tb != $length) {
    if ($windoof) {
      exec "\"$0\" @ARGV";
      exit;
    } else {
      die "$0: $server annouced $length bytes, but only $tb bytes has been read\n";
    }
  }

  unless ($pipe or -p $download or -c $download) {
    my @s = stat $file if -e $file;
    rename $download,$file
      or die "$0: cannot rename \"$download\" to \"$file\" - $!\n";
    chmod $s[2],$file if @s;
  }

  return sprintf("%s/%s",getcwd(),$file);
}


sub list {
  my $cmd = "$fexsend -L";
  $cmd .= " -i $opt_i" if $opt_i;
  if ($opt_v) {
    $cmd .= " -v";
    warn "$cmd\n";
  }
  open $cmd,"$cmd|" or die "$0: cannot run $cmd : $!\n";
  open $ffl,'>',$ffl or die "$0: cannot open $ffl : $!\n";
  my $n;
  while (<$cmd>) {
    if (/\d MB .*http/) {
      $n++;
      printf {$ffl} "%4d) %s",$n,$_;
      s:http[^\"]*/::;
      printf        "%4d) %s",$n,$_;
    } else {
      print;
      print {$ffl} $_;
    }
  }
}


sub locale {
  my $string = shift;

  if ($CTYPE) {
    if ($CTYPE =~ /UTF-?8/i) {
      return $string;
    } elsif (grep { $CTYPE =~ /^$_$/i } Encode->encodings()) {
      return encode($CTYPE,$string);
    } else {
      return encode('ISO-8859-1',$string);
    }
  }

  return $string;
}


sub pathsearch {
  my $prg = shift;

  foreach my $dir (split(':',$ENV{PATH})) {
    return "$dir/$prg" if -x "$dir/$prg";
  }
}


{
  my $tty;

  sub inquire {
    my $prompt = shift;
    my $default = shift;
    local $| = 1;
    local $_;

    if (defined $default) {
      unless ($tty) {
        chomp($tty = `tty 2>/dev/null`);
        eval { local $^W; require "sys/ioctl.ph"; };
      }

      if (defined(&TIOCSTI) and $tty and open($tty,'>',$tty)) {
        print $prompt;
        # push default answer into keyboard buffer
        foreach my $a (split("",$default)) { ioctl($tty,&TIOCSTI,$a) }
        chomp($_ = <STDIN>||'');
      } else {
        $prompt =~ s/([\?:=]\s*)/ [$default]$1/ or $prompt .= " [$default] ";
        print $prompt;
        chomp($_ = <STDIN>||'');
        $_ = $default unless length;
      }
    } else {
      print $prompt;
      chomp($_ = <STDIN>||'');
    }

    return $_;
  }
}


### common functions ###


sub mtime {
  my @d = localtime((stat shift)[9]);
  return sprintf('%d%02d%02d',$d[5]+1900,$d[4]+1,$d[3]);
}


sub urldecode {
  local $_ = shift;
  s/\%([a-f\d]{2})/chr(hex($1))/ige;
  return $_;
}


sub get_ssl_env {
  # set SSL/TLS options
  $SSL{SSL_verify_mode} = $ENV{SSLVERIFY} if defined($ENV{SSLVERIFY});
  foreach my $opt (qw(
    SSL_version
    SSL_cipher_list
    SSL_verify_mode
    SSL_ca_path
    SSL_ca_file)
  ) {
    my $env = uc($opt);
    $env =~ s/_//g;
    $SSL{$opt} = $ENV{$env} if defined($ENV{$env});
  }

  if ($SSL{SSL_verify_mode}) {
    &search_ca;
    unless ($SSL{SSL_ca_path} or $SSL{SSL_ca_file}) {
      die "$0: \$SSLVERIFYMODE, but not valid \$SSLCAPATH or \$SSLCAFILE\n";
    }
  } elsif (defined($SSL{SSL_verify_mode})) {
    # user has set SSLVERIFY=0 !
  } else {
    &search_ca;
    $SSL{SSL_verify_mode} = 1 if $SSL{SSL_ca_path} or $SSL{SSL_ca_file};
  }
}

sub search_ca {
  local $_;
  return if $SSL{SSL_ca_file} or $SSL{SSL_ca_path};
  foreach (qw(/etc/ssl/certs/ca-certificates.crt)) {
    if (-f) {
      $SSL{SSL_ca_file} = $_;
      return;
    }
  }
  foreach (qw(/etc/ssl/certs /etc/pki/tls/certs)) {
    if (-f) {
      $SSL{SSL_ca_path} = $_;
      return;
    }
  }
}


sub serverconnect {
  my ($server,$port) = @_;
  my $connect = "CONNECT $server:$port HTTP/1.1";
  local $_;

  if ($proxy) {
    tcpconnect(split(':',$proxy));
    if ($https) {
      printf "--> %s\n",$connect if $opt_v;
      nvtsend($connect,"");
      $_ = <$SH>;
      s/\r//;
      printf "<-- $_"if $opt_v;
      unless (/^HTTP.1.. 200/) {
        die "$0: proxy error : $_";
      }
      &enable_ssl;
      $SH = IO::Socket::SSL->start_SSL($SH,%SSL);
    }
  } else {
    tcpconnect($server,$port);
  }
#  if ($https and $opt_v) {
#    printf "%s\n",$SH->get_cipher();
#  }
}


# set up tcp/ip connection
sub tcpconnect {
  my ($server,$port) = @_;

  if ($SH) {
    close $SH;
    undef $SH;
  }

  if ($https) {
    # eval "use IO::Socket::SSL qw(debug3)";
    &enable_ssl;
    $SH = IO::Socket::SSL->new(
      PeerAddr => $server,
      PeerPort => $port,
      Proto    => 'tcp',
      %SSL
    );
  } else {
    $SH = IO::Socket::INET->new(
      PeerAddr => $server,
      PeerPort => $port,
      Proto    => 'tcp',
    );
  }

  if ($SH) {
    autoflush $SH 1;
    binmode $SH;
  } else {
    die "$0: cannot connect $server:$port - $@\n";
  }

  print "TCPCONNECT to $server:$port\n" if $opt_v;
}


sub enable_ssl {
  eval "use IO::Socket::SSL";
  die "$0: cannot load IO::Socket::SSL\n" if $@;
  eval '$SSL{SSL_verify_mode} = 0 if Net::SSLeay::SSLeay() <= 9470143';
  if ($opt_v) {
    foreach my $v (keys %SSL) {
      printf "%s => %s\n",$v,$SSL{$v};
    }
  }
}


sub sendheader {
  my $sp = shift;
  my @head = @_;
  my $head;

  push @head,"Host: $sp";

  foreach $head (@head) {
    print "--> $head\n" if $opt_v;
    print {$SH} $head,"\r\n";
  }
  print "-->\n" if $opt_v;
  print {$SH} "\r\n";
}


sub nvtsend {
  local $SIG{PIPE} = sub { $sigpipe = "@_" };

  $sigpipe = '';

  die "$0: internal error: no active network handle\n" unless $SH;
  die "$0: remote host has closed the link\n" unless $SH->connected;

  foreach my $line (@_) {
    print {$SH} $line,"\r\n";
    if ($sigpipe) {
      undef $SH;
      return 0;
    }
  }

  return 1;
}


sub quote {
  local $_ = shift;
  s/([^\w\@\/%^,.=+_:+-])/\\$1/g;
  return $_;
}


sub debug {
  print "## DEBUG: @_\n" if $DEBUG;
}


# from MIME::Base64::Perl
sub encode_b64 {
  my $res = "";
  my $eol = "\n";
  my $padding;

  pos($_[0]) = 0;
  $res = join '',map(pack('u',$_)=~ /^.(\S*)/, ($_[0]=~/(.{1,45})/gs));
  $res =~ tr|` -_|AA-Za-z0-9+/|;
  $padding = (3-length($_[0])%3)%3;
  $res =~ s/.{$padding}$/'=' x $padding/e if $padding;
  return $res;
}