path: root/lib/network/connection/wireless.pm

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.png' }
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)),

    {
        name => "ipw3945",
        description => "Intel(R) PRO/Wireless 3945",
        url => "http://ipw3945.sourceforge.net/",
        firmware => {
            package => "ipw3945-ucode",
            test_file => "ipw3945.ucode",
        },
        tools => {
            package => "ipw3945d",
            test_file => '/usr/sbin/ipw3945d',
        },
    },

    {
        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;