This file is indexed.

/usr/lib/dpkg/methods/ftp/install is in dselect 1.17.5ubuntu5.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
#!/usr/bin/perl
#
# Copyright © 1996 Andy Guy <awpguy@acs.ucalgary.ca>
# Copyright © 1998 Martin Schulze <joey@infodrom.north.de>
# Copyright © 1999, 2009 Raphaël Hertzog <hertzog@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

use strict;
use warnings;

eval q{
    use Net::FTP;
    use File::Path;
    use File::Basename;
    use File::Find;
    use Data::Dumper;
};
if ($@) {
    warn "Please install the 'perl' package if you want to use the\n" .
         "FTP access method of dselect.\n\n";
    exit 1;
}

use Dselect::Ftp;

my $ftp;

# exit value
my $exit = 0;

# deal with arguments
my $vardir = $ARGV[0];
my $method = $ARGV[1];
my $option = $ARGV[2];

if ($option eq 'manual') {
  print "manual mode not supported yet\n";
  exit 1;
}
#print "vardir: $vardir, method: $method, option: $option\n";

my $methdir = "$vardir/methods/ftp";

# get info from control file
read_config("$methdir/vars");

chdir "$methdir";
mkpath(["$methdir/$CONFIG{dldir}"], 0, 0755);


#Read md5sums already calculated
my %md5sums;
if (-f "$methdir/md5sums") {
  local $/;
  open(my $md5sums_fh, '<', "$methdir/md5sums")
    or die "couldn't read file $methdir/md5sums";
  my $code = <$md5sums_fh>;
  close $md5sums_fh;
  my $VAR1; ## no critic (Variables::ProhibitUnusedVariables)
  my $res = eval $code;
  if ($@) {
    die "couldn't eval $methdir/md5sums content: $@\n";
  }
  if (ref($res)) { %md5sums = %{$res} }
}

# get a block
# returns a ref to a hash containing flds->fld contents
# white space from the ends of lines is removed and newlines added
# (no trailing newline).
# die's if something unexpected happens
sub getblk {
    my $fh = shift;
    my %flds;
    my $fld;
    while (<$fh>) {
	if ( ! /^$/ ) {
	    FLDLOOP: while (1) {
		if ( /^(\S+):\s*(.*)\s*$/ ) {
		    $fld = lc($1);
		    $flds{$fld} = $2;
		    while (<$fh>) {
			if ( /^$/ ) {
			    return %flds;
			} elsif ( /^(\s.*)$/ ) {
			    $flds{$fld} = $flds{$fld} . "\n" . $1;
			} else {
			    next FLDLOOP;
			}
		    }
		    return %flds;
		} else {
		    die "expected a start of field line, but got:\n$_";
		}
	    }
	}
    }
    return %flds;
}

# process status file
# create curpkgs hash with version (no version implies not currently installed)
# of packages we want
print "Processing status file...\n";
my %curpkgs;
sub procstatus {
    my (%flds, $fld);
    open(my $status_fh, '<', "$vardir/status") or
        die 'Could not open status file';
    while (%flds = getblk($status_fh), %flds) {
	if($flds{'status'} =~ /^install ok/) {
	    my $cs = (split(/ /, $flds{'status'}))[2];
	    if (($cs eq 'not-installed') ||
	        ($cs eq 'half-installed') ||
	        ($cs eq 'config-files')) {
		$curpkgs{$flds{'package'}} = '';
	    } else {
		$curpkgs{$flds{'package'}} = $flds{'version'};
	    }
	}
    }
    close($status_fh);
}
procstatus();

sub dcmpvers {
    my($a, $p, $b) = @_;
    my ($r);
    $r = system('dpkg', '--compare-versions', "$a", "$p", "$b");
    $r = $r/256;
    if ($r == 0) {
	return 1;
    } elsif ($r == 1) {
	return 0;
    }
    die "dpkg --compare-versions $a $p $b - failed with $r";
}

# process package files, looking for packages to install
# create a hash of these packages pkgname => version, filenames...
# filename => md5sum, size
# for all packages
my %pkgs;
my %pkgfiles;
sub procpkgfile {
    my $fn = shift;
    my $site = shift;
    my $dist = shift;
    my (@files, @sizes, @md5sums, $pkg, $ver, $nfs, $fld);
    my(%flds);
    open(my $pkgfile_fh, '<', $fn) or die "could not open package file $fn";
    while (%flds = getblk($pkgfile_fh), %flds) {
	$pkg = $flds{'package'};
	$ver = $curpkgs{$pkg};
	@files = split(/[\s\n]+/, $flds{'filename'});
	@sizes = split(/[\s\n]+/, $flds{'size'});
	@md5sums = split(/[\s\n]+/, $flds{'md5sum'});
	if (defined($ver) && (($ver eq '') || dcmpvers($ver, 'lt', $flds{'version'}))) {
	    $pkgs{$pkg} = [ $flds{'version'}, [ @files ], $site ];
	    $curpkgs{$pkg} = $flds{'version'};
	}
	$nfs = scalar(@files);
	if(($nfs != scalar(@sizes)) || ($nfs != scalar(@md5sums)) ) {
	    print "Different number of filenames, sizes and md5sums for $flds{'package'}\n";
	} else {
	    my $i = 0;
	    foreach my $fl (@files) {
		$pkgfiles{$fl} = [ $md5sums[$i], $sizes[$i], $site, $dist ];
		$i++;
	    }
	}
    }
    close $pkgfile_fh or die "cannot close package file $fn: $!\n";
}

print "\nProcessing Package files...\n";
my ($fn, $i, $j);
$i = 0;
foreach my $site (@{$CONFIG{site}}) {
  $j = 0;
  foreach my $dist (@{$site->[2]}) {
    $fn = $dist;
    $fn =~ tr#/#_#;
    $fn = "Packages.$site->[0].$fn";
    if (-f $fn) {
	print " $site->[0] $dist...\n";
	procpkgfile($fn,$i,$j);
    } else {
	print "Could not find packages file for $site->[0] $dist distribution (re-run Update)\n"
    }
    $j++;
  }
  $i++;
}

my $dldir = $CONFIG{dldir};
# md5sum
sub md5sum($) {
    my $fn = shift;
    my $m = `md5sum $fn`;
    $m = (split(' ', $m))[0];
    $md5sums{"$dldir/$fn"} = $m;
    return $m;
}

# construct list of files to get
# hash of filenames => size of downloaded part
# query user for each paritial file
print "\nConstructing list of files to get...\n";
my %downloads;
my ($dir, @info, @files, $csize, $size);
my $totsize = 0;
foreach my $pkg (keys(%pkgs)) {
    @files = @{$pkgs{$pkg}[1]};
    foreach my $fn (@files) {
        #Look for a partial file
	if (-f "$dldir/$fn.partial") {
	  rename "$dldir/$fn.partial", "$dldir/$fn";
	}
	$dir = dirname($fn);
	if(! -d "$dldir/$dir") {
	    mkpath(["$dldir/$dir"], 0, 0755);
	}
	@info = @{$pkgfiles{$fn}};
	$csize = int($info[1]/1024)+1;
	if(-f "$dldir/$fn") {
	    $size = -s "$dldir/$fn";
	    if($info[1] > $size) {
		# partial download
		if (yesno('y', "continue file: $fn (" . nb($size) . '/' .
		               nb($info[1]) . ')')) {
		    $downloads{$fn} = $size;
		    $totsize += $csize - int($size/1024);
		} else {
		    $downloads{$fn} = 0;
		    $totsize += $csize;
		}
	    } else {
		# check md5sum
		if (! exists $md5sums{"$dldir/$fn"}) {
                  $md5sums{"$dldir/$fn"} = md5sum("$dldir/$fn");
		}
		if ($md5sums{"$dldir/$fn"} eq $info[0]) {
		    print "already got: $fn\n";
		} else {
		    print "corrupted: $fn\n";
		    $downloads{$fn} = 0;
		}
	    }
	} else {
	    my $ffn = $fn;
	    $ffn =~ s/binary-[^\/]+/.../;
	    print 'want: ' .
	          $CONFIG{site}[$pkgfiles{$fn}[2]][0] . " $ffn (${csize}k)\n";
	    $downloads{$fn} = 0;
	    $totsize += $csize;
	}
    }
}

my $avsp = `df -Pk $dldir| awk '{ print \$4}' | tail -n 1`;
chomp $avsp;

print "\nApproximate total space required: ${totsize}k\n";
print "Available space in $dldir: ${avsp}k\n";

#$avsp = `df -k $::dldir| paste -s | awk '{ print \$11}'`;
#chomp $avsp;

if($totsize == 0) {
    print 'Nothing to get.';
} else {
    if($totsize > $avsp) {
	print "Space required is greater than available space,\n";
	print "you will need to select which items to get.\n";
    }
# ask user which files to get
    if (($totsize > $avsp) ||
        yesno('n', 'Do you want to select the files to get')) {
	$totsize = 0;
	my @files = sort(keys(%downloads));
	my $def = 'y';
	foreach my $fn (@files) {
	    my @info = @{$pkgfiles{$fn}};
	    my $csize = int($info[1] / 1024) + 1;
	    my $rsize = int(($info[1] - $downloads{$fn}) / 1024) + 1;
	    if ($rsize + $totsize > $avsp) {
		print "no room for: $fn\n";
		delete $downloads{$fn};
	    } else {
		if(yesno($def, $downloads{$fn}
			 ? "download: $fn ${rsize}k/${csize}k (total = ${totsize}k)"
			 : "download: $fn ${rsize}k (total = ${totsize}k)")) {
		    $def = 'y';
		    $totsize += $rsize;
		} else {
		    $def = 'n';
		    delete $downloads{$fn};
		}
	    }
	}
    }
}

sub download() {

 my $i = 0;

 foreach my $site (@{$CONFIG{site}}) {

    my @getfiles = grep { $pkgfiles{$_}[2] == $i } keys %downloads;
    my @pre_dist = (); # Directory to add before $fn

    #Scan distributions for looking at "(../)+/dir/dir"
    my ($n,$cp);
    $cp = -1;
    foreach (@{$site->[2]}) {
      $cp++;
      $pre_dist[$cp] = '';
      $n = (s{\.\./}{../}g);
      next if (! $n);
      if (m<^((?:\.\./){$n}(?:[^/]+/){$n})>) {
        $pre_dist[$cp] = $1;
      }
    }

    if (! @getfiles) { $i++; next; }

    $ftp = do_connect ($site->[0], #$::ftpsite,
                       $site->[4], #$::username,
		       $site->[5], #$::password,
		       $site->[1], #$::ftpdir,
		       $site->[3], #$::passive,
		       $CONFIG{use_auth_proxy},
		       $CONFIG{proxyhost},
		       $CONFIG{proxylogname},
		       $CONFIG{proxypassword});

    local $SIG{INT} = sub { die "Interrupted !\n"; };

    my ($rsize, $res, $pre);
    foreach my $fn (@getfiles) {
        $pre = $pre_dist[$pkgfiles{$fn}[3]] || '';
	if ($downloads{$fn}) {
	    $rsize = ${pkgfiles{$fn}}[1] - $downloads{$fn};
	    print "getting: $pre$fn (" . nb($rsize) . '/' .
	          nb($pkgfiles{$fn}[1]) . ")\n";
	} else {
	    print "getting: $pre$fn (". nb($pkgfiles{$fn}[1]) . ")\n";
	}
	$res = $ftp->get("$pre$fn", "$dldir/$fn", $downloads{$fn});
	if(! $res) {
	    my $r = $ftp->code();
	    print $ftp->message() . "\n";
	    if (!($r == 550 || $r == 450)) {
		return 1;
	    } else {
              #Try to find another file or this package
	      print "Looking for another version of the package...\n";
	      my ($dir, $package) = ($fn =~ m{^(.*)/([^/]+)_[^/]+.deb$});
	      my $protected = $package;
	      $protected =~ s/\+/\\\+/g;
	      my $list = $ftp->ls("$pre$dir");
	      if ($ftp->ok() && ref($list)) {
                foreach (@{$list}) {
                  if (m/($dir\/${protected}_[^\/]+.deb)/i) {
		    print "Package found : $_\n";
		    print "getting: $_ (size not known)\n";
                    $res = $ftp->get($_, "$dldir/$1");
		    if (! $res) {
                      $r = $ftp->code();
		      print $ftp->message() . "\n";
		      return 1 if ($r != 550 and $r != 450);
		    }
		  }
		}
	      }
	    }
	}
	# fully got, remove it from list in case we have to re-download
	delete $downloads{$fn};
    }
    $ftp->quit();
    $i++;
 }
 return 0;
}

# download stuff (protect from ^C)
if($totsize != 0) {
    if (yesno('y', "\nDo you want to download the required files")) {
      DOWNLOAD_TRY: while (1) {
	  print "Downloading files... use ^C to stop\n";
	  eval {
	      if ((download() == 1) &&
	          yesno('y', "\nDo you want to retry downloading at once")) {
		  next DOWNLOAD_TRY;
	      }
	  };
	  if($@ =~ /Interrupted|Timeout/i ) {
	      # close the FTP connection if needed
	      if ((ref($ftp) =~ /Net::FTP/) and ($@ =~ /Interrupted/i)) {
	        $ftp->abort();
	        $ftp->quit();
	        undef $ftp;
	      }
	      print "FTP ERROR\n";
              if (yesno('y', "\nDo you want to retry downloading at once")) {
		  # get the first $fn that foreach would give:
		  # this is the one that got interrupted.
		MY_ITER: foreach my $ffn (keys(%downloads)) {
		    $fn = $ffn;
		    last MY_ITER;
		}
	        my $size = -s "$dldir/$fn";
		# partial download
		if (yesno('y', "continue file: $fn (at $size)")) {
		    $downloads{$fn} = $size;
		} else {
		    $downloads{$fn} = 0;
		}
		next DOWNLOAD_TRY;
	      } else {
	        $exit = 1;
		last DOWNLOAD_TRY;
	      }
	  } elsif ($@) {
             print "An error occurred ($@) : stopping download\n";
	  }
	  last DOWNLOAD_TRY;
      }
    }
}

# remove duplicate packages (keep latest versions)
# move half downloaded files out of the way
# delete corrupted files
print "\nProcessing downloaded files...(for corrupt/old/partial)\n";
my %vers; # package => version
my %files; # package-version => files...

# check a deb or split deb file
# return 1 if it a deb file, 2 if it is a split deb file
# else 0
sub chkdeb($) {
    my ($fn) = @_;
    # check to see if it is a .deb file
    if(!system("dpkg-deb --info $fn 2>&1 >/dev/null && dpkg-deb --contents $fn 2>&1 >/dev/null")) {
	return 1;
    } elsif(!system("dpkg-split --info $fn 2>&1 >/dev/null")) {
	return 2;
    }
    return 0;
}
sub getdebinfo($) {
    my ($fn) = @_;
    my $type = chkdeb($fn);
    my ($pkg, $ver);
    if($type == 1) {
	open(my $pkgfile_fh, '-|', "dpkg-deb --field $fn")
	    or die "cannot create pipe for 'dpkg-deb --field $fn'";
	my %fields = getblk($pkgfile_fh);
	close($pkgfile_fh);
	$pkg = $fields{'package'};
	$ver = $fields{'version'};
	if($fields{'package_revision'}) { $ver .= '-' . $fields{'package_revision'}; }
	return $pkg, $ver;
    } elsif ( $type == 2) {
	open(my $pkgfile_fh, '-|', "dpkg-split --info $fn")
	    or die "cannot create pipe for 'dpkg-split --info $fn'";
	while (<$pkgfile_fh>) {
	    /Part of package:\s*(\S+)/ and $pkg = $+;
	    /\.\.\. version:\s*(\S+)/ and $ver = $+;
	}
	close($pkgfile_fh);
	return $pkg, $ver;
    }
    print "could not figure out type of $fn\n";
    return $pkg, $ver;
}

# process deb file to make sure we only keep latest versions
sub prcdeb($$) {
    my ($dir, $fn) = @_;
    my ($pkg, $ver) = getdebinfo($fn);
    if(!defined($pkg) || !defined($ver)) {
	print "could not get package info from file\n";
	return 0;
    }
    if($vers{$pkg}) {
	if (dcmpvers($vers{$pkg}, 'eq', $ver)) {
	    $files{$pkg . $ver} = [ $files{$pkg . $ver }, "$dir/$fn" ];
	} elsif (dcmpvers($vers{$pkg}, 'gt', $ver)) {
	    print "old version\n";
	    unlink $fn;
	} else { # else $ver is gt current version
	    foreach my $c (@{$files{$pkg . $vers{$pkg}}}) {
		print "replaces: $c\n";
		unlink "$vardir/methods/ftp/$dldir/$c";
	    }
	    $vers{$pkg} = $ver;
	    $files{$pkg . $ver} = [ "$dir/$fn" ];
	}
    } else {
	$vers{$pkg} = $ver;
	$files{$pkg . $ver} = [ "$dir/$fn" ];
    }
}

sub prcfile() {
    my ($fn) = $_;
    if (-f $fn and $fn ne '.') {
        my $dir = '.';
	if (length($File::Find::dir) > length($dldir)) {
            $dir = substr($File::Find::dir, length($dldir)+1);
	}
	print "$dir/$fn\n";
	if(defined($pkgfiles{"$dir/$fn"})) {
	    my @info = @{$pkgfiles{"$dir/$fn"}};
	    my $size = -s $fn;
	    if($size == 0) {
		print "zero length file\n";
		unlink $fn;
	    } elsif($size < $info[1]) {
		print "partial file\n";
		rename $fn, "$fn.partial";
	    } elsif(( (exists $md5sums{"$dldir/$fn"})
	              and ($md5sums{"$dldir/$fn"} ne $info[0]) )
		     or
	            (md5sum($fn) ne $info[0])) {
		print "corrupt file\n";
		unlink $fn;
	    } else {
		prcdeb($dir, $fn);
	    }
	} elsif($fn =~ /.deb$/) {
	    if(chkdeb($fn)) {
		prcdeb($dir, $fn);
	    } else {
		print "corrupt file\n";
		unlink $fn;
	    }
	} else {
	    print "non-debian file\n";
	}
    }
}
find(\&prcfile, "$dldir/");

# install .debs
if (yesno('y', "\nDo you want to install the files fetched")) {
    print "Installing files...\n";
    #Installing pre-dependent package before !
    my (@flds, $package, @filename, $r);
    while (@flds = `dpkg --predep-package`, $? == 0) {
      foreach (@flds) {
        s/\s*\n//;
	$package= $_ if s/^Package: //i;
	@filename= split(/ +/,$_) if s/^Filename: //i;
      }
      @filename = map { "$dldir/$_" } @filename;
      next if (! @filename);
      $r = system('dpkg', '-iB', '--', @filename);
      if ($r) { print "DPKG ERROR\n"; $exit = 1; }
    }
    #Installing other packages after
    $r = system('dpkg', '-iGREOB', $dldir);
    if($r) {
	print "DPKG ERROR\n";
	$exit = 1;
    }
}

sub removeinstalled {
    my $fn = $_;
    if (-f $fn and $fn ne '.') {
        my $dir = '.';
	if (length($File::Find::dir) > length($dldir)) {
            $dir = substr($File::Find::dir, length($dldir)+1);
	}
	if($fn =~ /.deb$/) {
	    my($pkg, $ver) = getdebinfo($fn);
	    if(!defined($pkg) || !defined($ver)) {
		print "Could not get info for: $dir/$fn\n";
	    } else {
		if ($curpkgs{$pkg} and dcmpvers($ver, 'le', $curpkgs{$pkg})) {
		    print "deleting: $dir/$fn\n";
		    unlink $fn;
		} else {
		    print "leaving: $dir/$fn\n";
		}
	    }
	} else {
	    print "non-debian: $dir/$fn\n";
	}
    }
}

# remove .debs that have been installed (query user)
# first need to reprocess status file
if (yesno('y', "\nDo you wish to delete the installed package (.deb) files?")) {
    print "Removing installed files...\n";
    %curpkgs = ();
    procstatus();
    find(\&removeinstalled, "$dldir/");
}

# remove whole ./debian directory if user wants to
if (yesno('n', "\nDo you want to remove $dldir directory?")) {
    rmtree("$dldir");
}

#Store useful md5sums
foreach (keys %md5sums) {
  next if (-f $_);
  delete $md5sums{$_};
}
open(my $md5sums_fh, '>', "$methdir/md5sums")
  or die "can't open $methdir/md5sums in write mode: $!\n";
print { $md5sums_fh } Dumper(\%md5sums);
close $md5sums_fh;

exit $exit;