summaryrefslogtreecommitdiffstats
path: root/kio/misc/fileshareset
blob: a4f5345939d3554304b4cca99ebbffe728831bcb (plain)
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
#!/usr/bin/perl -T
use strict;

########################################
# config files
$nfs_exports::default_options = '*(ro,all_squash)';
$nfs_exports::conf_file = '/etc/exports';
$smb_exports::conf_file = '/etc/samba/smb.conf';
my $authorisation_file = '/etc/security/fileshare.conf';
my $authorisation_group = 'fileshare';


########################################
# Copyright (C) 2001-2002 MandrakeSoft (pixel@mandrakesoft.com)
#
# 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; either version 2, or (at your option)
# any later version.
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.


########################################
my $uid = $<;
my $username = getpwuid($uid);

########################################
# errors
my $usage =
"usage: fileshareset --add <dir>
       fileshareset --remove <dir>";
my $not_enabled =
qq(File sharing is not enabled.
To enable file sharing put 
"FILESHARING=yes" in $authorisation_file);
       
my $not_simple_enabled = 
qq(Simple file sharing is not enabled.
To enable simple file sharing put
"SHARINGMODE=simple" in $authorisation_file);

my $non_authorised =
qq(You are not authorised to use file sharing
To grant you the rights:
- put "RESTRICT=no" in $authorisation_file
- or put user "$username" in group "$authorisation_group");

my $no_export_method = "can't export anything: no nfs, no smb";

my %exit_codes = reverse (
  1 => $non_authorised,
  2 => $usage,

# when adding
  3 => "already exported", 
  4 => "invalid mount point",

# when removing
  5 => "not exported",

  6 => $no_export_method,
  
  7 => $not_enabled,
  
  8 => $not_simple_enabled,

  255 => "various",
);

################################################################################
# correct PATH needed to call /etc/init.d/... ? seems not, but...
%ENV = ();#(PATH => '/bin:/sbin:/usr/bin:/usr/sbin');

my $modify = $0 =~ /fileshareset/;

authorisation::check($modify);

my @exports = (
	       -e $nfs_exports::conf_file ? nfs_exports::read() : (),
	       -e $smb_exports::conf_file ? smb_exports::read() : (),
	      );
@exports or error($no_export_method);

if ($modify) {
    my ($cmd, $dir) = @ARGV;
    $< = $>;
    @ARGV == 2 && ($cmd eq '--add' || $cmd eq '--remove') or error($usage);

    verify_mntpoint($dir);

    if ($cmd eq '--add') {
	my @errs = map { eval { $_->add($dir) }; $@ } @exports;
	grep { !$_ } @errs or error("already exported");
    } else {
	my @errs = map { eval { $_->remove($dir) }; $@ } @exports;
	grep { !$_ } @errs or error("not exported");
    }    
    foreach my $export (@exports) {
	$export->write;
	$export->update_server;
    }
}
my @mntpoints = grep {$_} uniq(map { map { $_->{mntpoint} } @$_ } @exports);
print "$_\n" foreach grep { own($_) } @mntpoints;


sub own { $uid == 0 || (stat($_[0]))[4] == $uid }

sub verify_mntpoint {
    local ($_) = @_;
    my $ok = 1;
    $ok &&= m|^/|;
    $ok &&= !m|/\.\./|;
    $ok &&= !m|[\0\n\r]|;
    $ok &&= -d $_;
    $ok &&= own($_);
    $ok or error("invalid mount point");
}

sub error {
    my ($string) = @_;
    print STDERR "$string\n";
    exit($exit_codes{$string} || 255);
}
sub member { my $e = shift; foreach (@_) { $e eq $_ and return 1 } 0 }
sub uniq { my %l; $l{$_} = 1 foreach @_; grep { delete $l{$_} } @_ }


################################################################################
package authorisation;

sub read_conf {
    my ($exclusive_lock) = @_;
    open F_lock, $authorisation_file; # don't care if it's missing
    flock(F_lock, $exclusive_lock ? 2 : 1) or die "can't lock";
    my %conf;
    foreach (<F_lock>) {
	s/#.*//; # remove comments
	s/^\s+//; 
	s/\s+$//;
	/^$/ and next;
	my ($cmd, $value) = split('=', $_, 2);
	$conf{$cmd} = $value || warn qq(suspicious line "$_" in $authorisation_file\n);
    }
    # no close F_lock, keep it locked
    \%conf
}

sub check {
    my ($exclusive_lock) = @_;
    my $conf = read_conf($exclusive_lock);
    if (lc($conf->{FILESHARING}) eq 'no') {
      ::error($not_enabled);
    }
    
    if (lc($conf->{SHARINGMODE}) eq 'advanced') {
      ::error($not_simple_enabled);
    }
    
    if (lc($conf->{FILESHAREGROUP} ne '')) {
      $authorisation_group = lc($conf->{FILESHAREGROUP});
    }      
    
    if (lc($conf->{RESTRICT}) eq 'no') {
	# ok, access granted for everybody
    } else {
	my @l;
	while (@l = getgrent) {
	    last if $l[0] eq $authorisation_group;
	}
	::member($username, split(' ', $l[3])) or ::error($non_authorised);
    }
}

################################################################################
package exports;

sub tqfind {
    my ($exports, $mntpoint) = @_;
    foreach (@$exports) {
	$_->{mntpoint} eq $mntpoint and return $_;
    }
    undef;
}

sub add {
    my ($exports, $mntpoint) = @_;
    foreach (@$exports) {
	$_->{mntpoint} eq $mntpoint and die 'add';
    }
    push @$exports, my $e = { mntpoint => $mntpoint };
    $e;
}

sub remove {
    my ($exports, $mntpoint) = @_;
    my @l = grep { $_->{mntpoint} ne $mntpoint } @$exports;
    @l < @$exports or die 'remove';
    @$exports = @l;  
}


################################################################################
package nfs_exports;

use vars qw(@ISA $conf_file $default_options);
BEGIN { @ISA = 'exports' }

sub read {
    my $file = $conf_file;
    local *F;
    open F, $file or return [];

    my ($prev_raw, $prev_line, %e, @l);
    my $line_nb = 0;
    foreach my $raw (<F>) {
	$line_nb++;
	local $_ = $raw;
	$raw .= "\n" if !/\n/;

	s/#.*//; # remove comments

	s/^\s+//; 
	s/\s+$//; # remove unuseful spaces to help regexps

	if (/^$/) {
	    # blank lines ignored
	    $prev_raw .= $raw;
	    next;
	}

	if (/\\$/) {
	    # line continue across lines
	    chop; # remove the backslash
	    $prev_line .= "$_ ";
	    $prev_raw .= $raw;
	    next;
	}
	my $line = $prev_line . $_;
	my $raw_line = $prev_raw . $raw;
	($prev_line, $prev_raw) = ('', '');

	my ($mntpoint, $options) = $line =~ /("[^"]*"|\S+)\s+(.*)/ or die "$file:$line_nb: bad line $line\n";

	# You can also specify spaces or any other unusual characters in the
	# export path name using a backslash followed by the character code as
	# 3 octal digits.
	$mntpoint =~ s/\\(\d{3})/chr(oct $1)/ge;

	# not accepting weird characters that would break the output
	$mntpoint =~ m/[\0\n\r]/ and die "i won't handle this";
	push @l, { mntpoint => $mntpoint, option => $options, raw => $raw_line };
    }
    bless \@l, 'nfs_exports';
}

sub write {
    my ($nfs_exports) = @_;
    foreach (@$nfs_exports) {
	if (!exists $_->{options}) {
	    $_->{options} = $default_options;
	}
	if (!exists $_->{raw}) {	    
	    my $mntpoint = $_->{mntpoint} =~ /\s/ ? qq("$_->{mntpoint}") : $_->{mntpoint};
	    $_->{raw} = sprintf("%s %s\n", $mntpoint, $_->{options});
	}
    }
    local *F;
    open F, ">$conf_file" or die "can't write $conf_file";
    print F $_->{raw} foreach @$nfs_exports;
}

sub update_server {
    if (fork) {
	system('/usr/sbin/exportfs', '-r');
	if (system('PATH=/bin:/sbin pidof rpc.mountd >/dev/null') != 0 ||
	    system('PATH=/bin:/sbin pidof nfsd >/dev/null') != 0) {
	    # trying to start the server...
	    system('/etc/init.d/portmap start') if system('/etc/init.d/portmap status') != 0;
            if ( -f '/etc/init.d/nfs' ) {
	        system('/etc/init.d/nfs', $_) foreach 'stop', 'start';
            }
            elsif ( -f '/etc/init.d/nfs-kernel-server' ) {
	        system('/etc/init.d/nfs-kernel-server', $_) foreach 'stop', 'start';
            }
	}
	exit 0;
    }
}

################################################################################
package smb_exports;

use vars qw(@ISA $conf_file);
BEGIN { @ISA = 'exports' }

sub read {
    my ($s, @l);
    local *F;
    open F, $conf_file;
    local $_;
    while (<F>) {
	if (/^\s*\[.*\]/ || eof F) {
	    #- first line in the category
	    my ($label) = $s =~ /^\s*\[(.*)\]/;
	    my ($mntpoint) = $s =~ /^\s*path\s*=\s*(.*)/m;
	    push @l, { mntpoint => $mntpoint, raw => $s, label => $label };
	    $s = '';
	}
	$s .= $_;
    }
    bless \@l, 'smb_exports';
}

sub write {
    my ($smb_exports) = @_;
    foreach (@$smb_exports) {
	if (!exists $_->{raw}) {
	    $_->{raw} = <<EOF;

[$_->{label}]
   path = $_->{mntpoint}
   comment = $_->{mntpoint}
   public = yes
   guest ok = yes
   writable = no
   wide links = no
EOF
	}
    }
    local *F;
    open F, ">$conf_file" or die "can't write $conf_file";
    print F $_->{raw} foreach @$smb_exports;
}

sub add {
    my ($exports, $mntpoint) = @_;
    my $e = $exports->exports::add($mntpoint);
    $e->{label} = name_mangle($mntpoint, map { $_->{label} } @$exports);
}

sub name_mangle {
    my ($input, @others) = @_;

    local $_ = $input;

    # 1. first only keep legal characters. "/" is also kept for the moment
    tr|a-z|A-Z|;
    s|[^A-Z0-9#\-_!/]|_|g; # "$" is allowed except at the end, remove it in any case
    
    # 2. removing non-interesting parts
    s|^/||;
    s|^home/||;
    s|_*/_*|/|g;
    s|_+|_|g;

    # 3. if size is too small (!), make it bigger
    $_ .= "_" while length($_) < 3;

    # 4. if size is too big, shorten it
    while (length > 12) {
	my ($s) = m|.*?/(.*)|;
	if (length($s) > 8 && !grep { /\Q$s/ } @others) {
	    # dropping leading directories when the resulting is still long and meaningful
	    $_ = $s;
	    next;
	}
	s|(.*)[0-9#\-_!/]|$1| and next;

	# inspired by "Christian Brolin" "Long names are doom" on comp.lang.functional
	s|(.+)[AEIOU]|$1| and next; # allButFirstVowels
	s|(.*)(.)\2|$1$2| and next; # adjacentDuplicates

	s|(.*).|$1|; # booh, :'-(
    }

    # 5. remove "/"s still there
    s|/|_|g;

    # 6. resolving conflicts
    my $l = join("|", map { quotemeta } @others);
    my $conflicts = qr|^($l)$|;
    if (/$conflicts/) {
      A: while (1) {
	    for (my $nb = 1; length("$_$nb") <= 12; $nb++) {
		if ("$_$nb" !~ /$conflicts/) {
		    $_ = "$_$nb";
		    last A;
		}
	    }
	    $_ or die "can't tqfind a unique name";
	    # can't tqfind a unique name, dropping the last letter
	    s|(.*).|$1|;
	}
    }

    # 7. done
    $_;
}

sub update_server {
  if (fork) {
    system('/usr/bin/killall -HUP smbd 2>/dev/null');
    if (system('PATH=/bin:/sbin pidof smbd >/dev/null') != 0 ||
	system('PATH=/bin:/sbin pidof nmbd >/dev/null') != 0) {
# trying to start the server...
      if ( -f '/etc/init.d/smb' ) {
	system('/etc/init.d/smb', $_) foreach 'stop', 'start';
      }
      elsif ( -f '/etc/init.d/samba' ) {
	system('/etc/init.d/samba', $_) foreach 'stop', 'start';
      }
	  elsif ( -f '/etc/rc.d/rc.samba' ) {
	system('/etc/rc.d/rc.samba', $_) foreach 'stop', 'start';
	  }
      else {
	print STDERR "Error: Can't tqfind the samba init script \n";
      }
    }
    exit 0;
  }
}