summaryrefslogtreecommitdiffstats
path: root/lib/network/connection/wireless.pm
blob: fd0c82b6b7d7525f103fe033c0fb6b6c3220cecd (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
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
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
package network::connection::wireless;

use strict;
use common;

use base qw(network::connection::ethernet);

use strict;
use common;

sub get_type_name() { N("Wireless") }
sub get_type_icon() { 'wireless-24' }
sub get_devices {
    my ($_class, %options) = @_;
    require detect_devices;
    my @devices = detect_devices::probe_category('network/wireless');
    my @wireless = grep { detect_devices::is_wireless_interface($_) } detect_devices::get_lan_interfaces();
    my @all_devices = (@devices, network::connection::ethernet::get_unlisted_devices(\@wireless, \@devices));
    foreach (@all_devices) {
        my $interface = network::connection::ethernet::device_to_interface($_) or next;
        my $driver = network::connection::ethernet::interface_to_driver($interface) or next;
        $_->{driver} = $driver if $driver;
    }
    @all_devices,
    if_(!$options{automatic_only}, {
        driver => 'ndiswrapper',
        description => N("Use a Windows driver (with ndiswrapper)"),
    });
}

sub handles_ifcfg {
    my ($_class, $ifcfg) = @_;
    require detect_devices;
    detect_devices::is_wireless_interface($ifcfg->{DEVICE}) || exists $ifcfg->{WIRELESS_MODE};
}

sub get_metric { 35 }

#- class attributes:
#-   network: ID of the selected network

our %wireless_enc_modes = (
    none => N_("None"),
    open => N_("Open WEP"),
    restricted => N_("Restricted WEP"),
    'wpa-psk' => N_("WPA Pre-Shared Key"),
);

my @thirdparty_settings = (
    {
        name => 'zd1201',
        description => 'ZyDAS ZD1201',
        url => 'http://linux-lc100020.sourceforge.net/',
        firmware => {
            test_file => 'zd1201*.fw',
        },
    },

    (map {
        {
            name => "ipw${_}",
            description => "Intel(R) PRO/Wireless ${_}",
            url => "http://ipw${_}.sourceforge.net/",
            firmware => {
                url => "http://ipw${_}.sourceforge.net/firmware.php",
                test_file => "ipw$_-*.fw",
            },
        };
    } (2100, 2200)),

    (map {
        {
            name => "iwl${_}",
            description => "Intel(R) PRO/Wireless ${_}",
            url => "http://intellinuxwireless.org/",
            firmware => {
                package => "iwlwifi-${_}-ucode",
                test_file => "iwlwifi-${_}.ucode",
            },
        };
    } (3945, 4965)),

    {
        name => 'prism54',
        description => 'Prism GT / Prism Duette / Prism Indigo Chipsets',
        url => 'http://prism54.org/',
        firmware => {
            url => 'http://prism54.org/~mcgrof/firmware/',
            test_file => "isl38*",
        },
    },

    {
        name => 'atmel',
        matching => [ qw(at76_usb atmel_cs atmel_pci) ],
        description => 'Atmel at76c50x cards',
        url => 'http://thekelleys.org.uk/atmel/',
        firmware => {
            test_file => 'atmel_at76c50*',
        },
        links => 'http://at76c503a.berlios.de/',
    },

    {
        name => 'madwifi',
        matching => 'ath_pci',
        description => 'Multiband Atheros Driver for WiFi',
        url => 'http://madwifi.org/',
        kernel_module => 1,
        tools => {
            optional => 1,
            test_file => '/usr/bin/athstats',
        },
    },

    {
        name => 'prism2',
        matching => qr/^prism2_/,
        description => 'Prism2 based cards',
        tools => {
            package => 'prism2-utils',
            test_file => '/sbin/wlanctl-ng',
        },
    },

    {
        name => 'zd1211',
        matching => 'zd1211rw',
        description => 'ZD1211 chip',
        firmware => {
            url => 'http://sourceforge.net/projects/zd1211/',
            test_file => 'zd1211/zd1211_*',
        },
    },

    {
        name => 'bcm43xx',
        description => 'Broadcom bcm43xx wireless chips',
        url => 'http://bcm43xx.berlios.de/',
        firmware => {
            test_file => 'bcm43xx_microcode*.fw',
            extract => {
                name => 'bcm43xx-fwcutter',
                test_file => '/usr/bin/bcm43xx-fwcutter',
                windows_source => 'bcmwl5.sys',
                default_source => 'bcmwl5.sys',
                run => sub {
                    my ($file) = @_;
                    run_program::rooted($::prefix, '/usr/bin/bcm43xx-fwcutter',
                                        '-w', $network::thirdparty::firmware_directory, $file);
                },
            },
        },
    },

    {
        name => 'acx100',
        matching => [ qw(acx_pci acx_usb) ],
        description => 'ACX100/ACX111/TNETW1450',
        firmware => {
            url => 'http://acx100.sourceforge.net/wiki/Firmware',
            test_file => 'tiacx1*',
            no_package => 1,
        },
    },

    {
        name => 'ndiswrapper',
        description => 'Wireless device using ndiswrapper (windows drivers)',
        tools => {
            test_file => '/usr/sbin/ndiswrapper',
        },
        firmware => {
            user_install => sub {
                my ($settings, $in) = @_;
                require network::ndiswrapper;
                $settings->{device} = network::ndiswrapper::select_device($in) or return;
                $settings->{device}{driver} = $settings->{name};
                network::ndiswrapper::setup_device($in, $settings->{device});
            },
            url => 'http://ndiswrapper.sourceforge.net/mediawiki/index.php/List',
            explanations => N_("Firmware files are required for this device."),
            no_package => 1,
        },
    },

    {
        name => 'rt61',
        description => 'Ralink RT61 802.11abg WLAN',
        firmware => {
            url => 'http://rt2x00.serialmonkey.com/',
            test_file => 'rt2661.bin',
        },
    },

    {
        name => 'rt73',
        description => 'Ralink RT73 802.11abg WLAN',
        firmware => {
            url => 'http://rt2x00.serialmonkey.com/',
            test_file => 'rt73.bin',
        },
    },

);

sub get_packages { 'wireless-tools' }

sub get_thirdparty_settings() {
    \@thirdparty_settings;
}

sub setup_thirdparty {
    my ($self, $in) = @_;
    require network::rfswitch;
    network::rfswitch::configure();
    if ($self->get_driver eq 'ndiswrapper') {
        require network::ndiswrapper;
        my @devices = map { network::ndiswrapper::present_devices($_) } network::ndiswrapper::installed_drivers();
        return {} if member($self->{device}, @devices) && network::ndiswrapper::find_interface($self->{device});
    }
    my $thirdparty = $self->SUPER::setup_thirdparty($in);
    my $driver = $self->get_driver;
    if ($self->{thirdparty} && $driver eq 'ipw3945' && !$self->rf_killed && !$self->SUPER::check_device) {
        log::explanations("Reloading module $driver");
        eval { modules::unload($driver) };
        eval { modules::load($driver) };
    }
    $thirdparty;
}

sub rf_killed {
    my ($self) = @_;
    if ($self->{device}{sysfs_device}) {
        my $rf_kill_path = $self->{device}{sysfs_device} . "/rf_kill";
        if (-e $rf_kill_path) {
            my $rf_kill = chomp_(cat_($rf_kill_path));
            #- for ipw drivers, 0 means no RF kill switch
            return $rf_kill != 0;
        }
    }
    undef;
}

sub check_device {
    my ($self) = @_;
    if ($self->rf_killed) {
        $self->{device}{error} = N("Your wireless card is disabled, please enable the wireless switch (RF kill switch) first.");
        return 0;
    }
    return $self->SUPER::check_device;
}

sub load_interface_settings {
    my ($self) = @_;
    $self->SUPER::load_interface_settings;
}

sub get_networks {
    my ($self) = @_;
    require network::monitor;
    ($self->{networks}, $self->{control}{roaming}) = network::monitor::list_wireless(undef, $self->get_interface);
    $self->{networks};
}

sub guess_network {
    my ($_self) = @_;
    #- FIXME: try to find the AP matching $self->{ifcfg}{WIRELESS_ESSID};
}

sub get_network_ifcfg {
    my ($ssid) = @_;
    require network::network;
    my $file = $::prefix . $network::network::wireless_d . '/' . $ssid;
    -f $file && { getVarsFromSh($file) };
}

sub guess_network_access_settings {
    my ($self) = @_;

    my $ifcfg;
    my $network = $self->get_selected_network;
    $ifcfg = $network ?
      get_network_ifcfg($network->{ap}) || get_network_ifcfg($network->{essid}) :
      $self->{ifcfg};
    $ifcfg ||= {};

    $self->{access}{network}{essid} = $network && $network->{essid} || $ifcfg->{WIRELESS_ESSID} || !$network && "any";
    ($self->{access}{network}{key}, my $restricted) = get_wep_key_from_iwconfig($ifcfg->{WIRELESS_ENC_KEY});
    $self->{access}{network}{encryption} =
      $network && $network->{flags} =~ /wpa/i ?
        'wpa-psk' :
      $network && $network->{flags} =~ /wep/i || $self->{access}{network}{key} ?
        ($restricted ? 'restricted' : 'open') :
        'none';

    undef $self->{ifcfg}{WIRELESS_IWPRIV} if is_old_rt2x00($self->get_driver) && $self->{ifcfg}{WIRELESS_IWPRIV} =~ /WPAPSK/;

    $self->{control}{roaming} = exists $self->{ifcfg}{WIRELESS_WPA_DRIVER} && !is_old_rt2x00($self->get_driver);

    $self->{access}{network}{mode} =
        $network && $network->{mode} ||
        $ifcfg->{WIRELESS_MODE} ||
        'Managed';
}

sub get_network_access_settings_label { N("Wireless settings") }

sub get_network_access_settings {
    my ($self) = @_;
    [
        { label => N("Operating Mode"), val => \$self->{access}{network}{mode},
          list => [ N_("Ad-hoc"), N_("Managed"), N_("Master"), N_("Repeater"), N_("Secondary"), N_("Auto") ],
          format => \&translate,
        },
        { label => N("Network name (ESSID)"), val => \$self->{access}{network}{essid},
          disabled => sub { my $network = $self->get_selected_network; $network && $network->{essid} } },
        { label => N("Encryption mode"), val => \$self->{access}{network}{encryption}, list => [ keys %wireless_enc_modes ],
          sort => 1, format => sub { translate($wireless_enc_modes{$_[0]}) } },
        { label => N("Encryption key"), val => \$self->{access}{network}{key},
          disabled => sub { $self->{access}{network}{encryption} eq 'none' } },
        { label => N("Network ID"), val => \$self->{ifcfg}{WIRELESS_NWID}, advanced => 1 },
        { label => N("Operating frequency"), val => \$self->{ifcfg}{WIRELESS_FREQ}, advanced => 1 },
        { label => N("Sensitivity threshold"), val => \$self->{ifcfg}{WIRELESS_SENS}, advanced => 1 },
        { label => N("Bitrate (in b/s)"), val => \$self->{ifcfg}{WIRELESS_RATE}, advanced => 1 },
        { label => N("RTS/CTS"), val => \$self->{ifcfg}{WIRELESS_RTS}, advanced => 1,
          help => N("RTS/CTS adds a handshake before each packet transmission to make sure that the
channel is clear. This adds overhead, but increase performance in case of hidden
nodes or large number of active nodes. This parameter sets the size of the
smallest packet for which the node sends RTS, a value equal to the maximum
packet size disable the scheme. You may also set this parameter to auto, fixed
or off.")
      },
        { label => N("Fragmentation"), val => \$self->{ifcfg}{WIRELESS_FRAG}, advanced => 1 },
        { label => N("iwconfig command extra arguments"), val => \$self->{ifcfg}{WIRELESS_IWCONFIG}, advanced => 1,
          help => N("Here, one can configure some extra wireless parameters such as:
ap, channel, commit, enc, power, retry, sens, txpower (nick is already set as the hostname).

See iwconfig(8) man page for further information."),
      },
        { label =>
            #-PO: split the "xyz command extra argument" translated string into two lines if it's bigger than the english one
            N("iwspy command extra arguments"), val => \$self->{ifcfg}{WIRELESS_IWSPY}, advanced => 1,
          help => N("iwspy is used to set a list of addresses in a wireless network
interface and to read back quality of link information for each of those.

This information is the same as the one available in /proc/net/wireless :
quality of the link, signal strength and noise level.

See iwpspy(8) man page for further information."),
 },
        { label => N("iwpriv command extra arguments"), val => \$self->{ifcfg}{WIRELESS_IWPRIV}, advanced => 1,
          disabled => sub { $self->need_rt2x00_iwpriv },
          help => N("iwpriv enable to set up optionals (private) parameters of a wireless network
interface.

iwpriv deals with parameters and setting specific to each driver (as opposed to
iwconfig which deals with generic ones).

In theory, the documentation of each device driver should indicate how to use
those interface specific commands and their effect.

See iwpriv(8) man page for further information."),
          },
    ];
}

sub check_network_access_settings {
    my ($self) = @_;

    if ($self->{access}{network}{encryption} ne 'none' && !$self->{access}{network}{key}) {
        $self->{network_access}{error}{message} = N("An encryption key is required.");
        $self->{network_access}{error}{field} =  \$self->{access}{network}{key};
        return 0;
    }

    if ($self->{ifcfg}{WIRELESS_FREQ} && $self->{ifcfg}{WIRELESS_FREQ} !~ /[0-9.]*[kGM]/) {
        $self->{network_access}{error}{message} = N("Freq should have the suffix k, M or G (for example, \"2.46G\" for 2.46 GHz frequency), or add enough '0' (zeroes).");
        $self->{network_access}{error}{field} = \$self->{ifcfg}{WIRELESS_FREQ};
        return 0;
    }

    if ($self->{ifcfg}{WIRELESS_RATE} && $self->{ifcfg}{WIRELESS_RATE} !~ /[0-9.]*[kGM]/) {
        $self->{network_access}{error}{message} = N("Rate should have the suffix k, M or G (for example, \"11M\" for 11M), or add enough '0' (zeroes).");
        $self->{network_access}{error}{field} = \$self->{ifcfg}{WIRELESS_RATE};
        return 0;
    }

    return 1;
}

sub get_control_settings {
    my ($self) = @_;
    [
        @{$self->SUPER::get_control_settings},
        { text => N("Allow access point roaming"), val => \$self->{control}{roaming}, type => "bool",
          disabled => sub { is_wpa_supplicant_blacklisted($self->get_driver) } },
    ];
}

sub need_wpa_supplicant {
    my ($self) = @_;
    ($self->{control}{roaming} || $self->{access}{network}{encryption} eq 'wpa-psk') && !is_old_rt2x00($self->get_driver);
}

sub install_packages {
    my ($self, $in) = @_;
    if ($self->need_wpa_supplicant) {
        $in->do_pkgs->ensure_is_installed('wpa_supplicant', '/usr/sbin/wpa_supplicant') or return;
    }
    $self->SUPER::install_packages($in);
}


sub build_ifcfg_settings {
    my ($self) = @_;
    my $settings = {
        WIRELESS_MODE => $self->{access}{network}{mode},
        if_($self->need_wpa_supplicant,
            WIRELESS_WPA_DRIVER => wpa_supplicant_get_driver($self->get_driver),
            MII_NOT_SUPPORTED => 'no',
        ),
        WIRELESS_ESSID => $self->{access}{network}{essid},
        if_($self->{access}{network}{encryption} ne 'none',
            WIRELESS_ENC_KEY => convert_wep_key_for_iwconfig($self->{access}{network}{key}, $self->{access}{network}{encryption} eq 'restricted')),
        if_($self->need_rt2x00_iwpriv,
            #- use iwpriv for WPA with rt2400/rt2500 drivers, they don't plan to support wpa_supplicant
            WIRELESS_IWPRIV => qq(set AuthMode=WPAPSK
set EncrypType=TKIP
set SSID=$self->{access}{network}{essid}
set WPAPSK="$self->{access}{network}{key}"
set TxRate=0)),
        (map { $_ => $self->{ifcfg}{$_} }
           qw(WIRELESS_NWID WIRELESS_FREQ WIRELESS_SENS WIRELESS_RATE WIRELESS_RTS WIRELESS_FRAG WIRELESS_IWCONFIG WIRELESS_IWSPY), if_(!$self->need_rt2x00_iwpriv, 'WIRELESS_IWPRIV')),
    };
    $self->SUPER::build_ifcfg_settings($settings);
}

sub write_settings {
    my ($self, $o_net, $o_modules_conf) = @_;

    wpa_supplicant_add_network($self->{access}{network}{essid}, $self->{access}{network}{encryption}, $self->{access}{network}{key}, $self->{access}{network}{mode}) if $self->need_wpa_supplicant;

    wlan_ng_configure($self->{access}{network}{essid}, $self->{access}{network}{key}, $self->get_interface, $self->get_driver) if $self->{thirdparty}{name} eq 'prism2';

    my $network = $self->get_selected_network;
    network::network::write_wireless_conf($_, $self->build_ifcfg_settings) foreach
        grep { $_ } ($network ? $network->{ap} : ()), $self->{access}{network}{essid};

    $self->SUPER::write_settings($o_net, $o_modules_conf);
}

sub network_is_configured {
    my ($self, $network) = @_;
    if ($self->{control}{roaming}) {
        return defined $network->{id};
    } else {
        my $wireless_ifcfg = get_network_ifcfg($network->{ap}) || defined $network->{essid} && get_network_ifcfg($network->{essid});
        return $wireless_ifcfg;
    }
}

sub selected_network_is_configured {
    my ($self) = @_;

    my $network = $self->get_selected_network or return;
    $self->network_is_configured($network);
}

sub prepare_connection {
    my ($self) = @_;
    if ($self->{control}{roaming}) {
        #- this should be handled by the monitoring daemon instead
        run_program::run('/usr/sbin/wpa_cli', 'reconfigure');
        sleep 2;
    }
}

sub connect {
    my ($self, $_in, $net) = @_;

    $self->SUPER::connect;

    if ($self->{control}{roaming}) {
        my $network = $self->get_selected_network;
        if ($network && defined $network->{id}) {
            eval { $net->{monitor}->select_network($network->{id}) };
            return !$@;
        }
    }
}

sub get_status_message {
    my ($self, $status) = @_;
    my $interface = $self->get_interface;
    my ($current_essid, $current_ap) = get_access_point($interface);
    my $network = $current_essid || $current_ap && "[$current_ap]";
    {
        link_up => N("Associated to wireless network \"%s\" on interface %s", $network, $interface),
        link_down => N("Lost association to wireless network on interface %s", $interface),
    }->{$status} || $self->SUPER::get_status_message($status);
}



my $wpa_supplicant_conf = "/etc/wpa_supplicant.conf";

sub get_access_point {
    my ($intf) = @_;
    (chomp_(`/sbin/iwgetid -r $intf 2>/dev/null`), lc(chomp_(`/sbin/iwgetid -r -a $intf 2>/dev/null`)));
}

sub is_old_rt2x00 {
    my ($module) = @_;
    member($module, qw(rt2400 rt2500 rt2570 rt61 rt73));
}

sub is_wpa_supplicant_blacklisted {
    my ($module) = @_;
    is_old_rt2x00($module);
}

sub need_rt2x00_iwpriv {
    my ($self) = @_;
    is_old_rt2x00($self->get_driver) && $self->{access}{network}{encryption} eq 'wpa-psk';
}

sub get_hex_key {
    my ($key) = @_;
    if ($key =~ /^([[:xdigit:]]{4}[\:-]?)+[[:xdigit:]]{2,}$/) {
        $key =~ s/[\:-]//g;
        return lc($key);
    }
}

sub convert_wep_key_for_iwconfig {
    #- 5 or 13 characters, consider the key as ASCII and prepend "s:"
    #- else consider the key as hexadecimal, do not strip dashes
    #- always quote the key as string
    my ($real_key, $restricted) = @_;
    my $key = get_hex_key($real_key) || "s:$real_key";
    $restricted ? "restricted $key" : "open $key";
}

sub convert_wep_key_for_wpa_supplicant {
    my ($key) = @_;
    get_hex_key($key) || qq("$key");
}

sub get_wep_key_from_iwconfig {
    #- strip "s:" if the key is 5 or 13 characters (ASCII)
    #- else the key as hexadecimal, do not modify
    my ($key) = @_;
    my ($mode, $real_key) = $key =~ /^(?:(open|restricted)\s+)?(.*)$/;
    $real_key =~ s/^s://;
    ($real_key, $mode eq 'restricted');
}

sub convert_key_for_wpa_supplicant {
    my ($key) = @_;
    length($key) == 64 && get_hex_key($key) || qq("$key");
}

#- FIXME: to be improved (quotes, comments) and moved in common files
sub wlan_ng_update_vars {
    my ($file, $vars) = @_;
    substInFile {
        while (my ($key, $value) = each(%$vars)) {
            s/^#?\Q$key\E=(?:"[^#]*"|[^#\s]*)(\s*#.*)?/$key=$value$1/ and delete $vars->{$key};
        }
        $_ .= join('', map { "$_=$vars->{$_}\n" } keys %$vars) if eof;
    } $file;
}

sub wlan_ng_configure {
    my ($essid, $key, $device, $module) = @_;
    my $wlan_conf_file = "$::prefix/etc/wlan/wlan.conf";
    my @wlan_devices = split(/ /, (cat_($wlan_conf_file) =~ /^WLAN_DEVICES="(.*)"/m)[0]);
    push @wlan_devices, $device unless member($device, @wlan_devices);
    #- enable device and make it use the choosen ESSID
    wlan_ng_update_vars($wlan_conf_file,
                        {
                            WLAN_DEVICES => qq("@wlan_devices"),
                            "SSID_$device" => qq("$essid"),
                            "ENABLE_$device" => "y"
                        });

    my $wlan_ssid_file = "$::prefix/etc/wlan/wlancfg-$essid";
    #- copy default settings for this ESSID if config file does not exist
    -f $wlan_ssid_file or cp_f("$::prefix/etc/wlan/wlancfg-DEFAULT", $wlan_ssid_file);

    #- enable/disable encryption
    wlan_ng_update_vars($wlan_ssid_file,
                        {
                            (map { $_ => $key ? "true" : "false" } qw(lnxreq_hostWEPEncrypt lnxreq_hostWEPDecrypt dot11PrivacyInvoked dot11ExcludeUnencrypted)),
                            AuthType => $key ? qq("sharedkey") : qq("opensystem"),
                            if_($key,
                                dot11WEPDefaultKeyID => 0,
                                dot11WEPDefaultKey0 => qq("$key")
                            )
                        });
    #- hide settings for non-root users
    chmod 0600, $wlan_conf_file;
    chmod 0600, $wlan_ssid_file;

    #- apply settings on wlan interface
    require services;
    services::restart($module eq 'prism2_cs' ? 'pcmcia' : 'wlan');
}

sub wpa_supplicant_get_driver {
    my ($module) = @_;
    $module =~ /^hostap_/ ? "hostap" :
    $module eq "prism54" ? "prism54" :
    $module =~ /^ath_/ ? "madwifi" :
    $module =~ /^at76c50|atmel_/ ? "atmel" :
    "wext";
}

sub wpa_supplicant_add_network {
    my ($essid, $enc_mode, $key, $mode) = @_;
    my $conf = wpa_supplicant_read_conf();
    my $network = {
        ssid => qq("$essid"),
        scan_ssid => 1,
    };

    if ($enc_mode eq 'wpa-psk') {
        $network->{psk} = convert_key_for_wpa_supplicant($key);
    } else {
        $network->{key_mgmt} = 'NONE';
        $network->{mode} = to_bool($mode eq 'Ad-Hoc');
        if (member($enc_mode, qw(open restricted))) {
            put_in_hash($network, {
                wep_key0 => convert_wep_key_for_wpa_supplicant($key),
                wep_tx_keyidx => 0,
                auth_alg => $enc_mode eq 'restricted' ? 'SHARED' : 'OPEN',
            });
        }
    }

    @$conf = difference2($conf, [ wpa_supplicant_find_similar($conf, $network) ]);
    push @$conf, $network;
    wpa_supplicant_write_conf($conf);
}

sub wpa_supplicant_find_similar {
    my ($conf, $network) = @_;
    grep {
        my $current = $_;
        any { exists $network->{$_} && $network->{$_} eq $current->{$_} } qw(ssid bssid);
    } @$conf;
}

sub wpa_supplicant_read_conf() {
    my @conf;
    my $network;
    foreach (cat_($::prefix . $wpa_supplicant_conf)) {
        if ($network) {
            #- in a "network = {}" block
            if (/^\s*(\w+)=(.*?)(?:\s*#.*)?$/) {
                $network->{$1} = $2;
            } elsif (/^\}/) {
                #- end of network block
                push @conf, $network;
                undef $network;
            }
        } elsif (/^\s*network={/) {
            #- beginning of a new network block
            $network = {};
        }
    }
    \@conf;
}

sub wpa_supplicant_write_conf {
    my ($conf) = @_;
    my $buf;
    my @conf = @$conf;
    my $network;
    foreach (cat_($::prefix . $wpa_supplicant_conf)) {
        if ($network) {
            #- in a "network = {}" block
            if (/^\s*(\w+)=(.*)$/) {
                push @{$network->{entries}}, { key => $1, value => $2 };
                member($1, qw(ssid bssid)) and $network->{$1} = $2;
            } elsif (/^\}/) {
                #- end of network block, write it
                $buf .= "network={$network->{comment}\n";

                my $new_network = first(wpa_supplicant_find_similar(\@conf, $network));
                foreach (@{$network->{entries}}) {
                    my $key = $_->{key};
                    if ($new_network) {
                        #- do not write entry if not provided in the new network
                        exists $new_network->{$key} or next;
                        #- update value from the new network
                        $_->{value} = delete $new_network->{$key};
                    }
                    $buf .= "    ";
                    $buf .= "$key=$_->{value}" if $key;
                    $buf .= "$_->{comment}\n";
                }
                if ($new_network) {
                    #- write new keys
                    while (my ($key, $value) = each(%$new_network)) {
                        $buf .= "    $key=$value\n";
                    }
                }
                $buf .= "}\n";
                $new_network and @conf = grep { $_ != $new_network } @conf;
                undef $network;
            } else {
                #- unrecognized, keep it anyway
                push @{$network->{entries}}, { comment => $_ };
            }
        } else {
            if (/^\s*network={/) {
                #- beginning of a new network block
                $network = {};
            } else {
                #- keep other options, comments
                $buf .= $_;
            }
        }
    }

    #- write remaining networks
    foreach (@conf) {
        $buf .= "\nnetwork={\n";
        while (my ($key, $value) = each(%$_)) {
            $buf .= "    $key=$value\n";
        }
        $buf .= "}\n";
    }

    output($::prefix . $wpa_supplicant_conf, $buf);
    #- hide keys for non-root users
    chmod 0600, $::prefix . $wpa_supplicant_conf;
}

1;