iwmgmt.c

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/*
 * Copyright (C) 2009 Joshua Oreman <oremanj@rwcr.net>.
 *
 * 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 of the
 * License, or 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.
 */

FILE_LICENCE ( GPL2_OR_LATER );

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ipxe/net80211.h>
#include <ipxe/ethernet.h>
#include <usr/ifmgmt.h>
#include <usr/iwmgmt.h>

/** @file
 *
 * Wireless network interface management
 *
 */

/**
 * Print status of 802.11 device
 *
 * @v dev       802.11 device
 */
void iwstat ( struct net80211_device *dev ) {

        ifstat ( dev->netdev );

        printf ( "  [802.11 ");
        if ( dev->state & NET80211_ASSOCIATED ) {
                printf ( "SSID '%s', ", dev->essid );
        } else {
                printf ( "not associated, " );
        }
        if ( dev->channel < dev->nr_channels && dev->rate < dev->nr_rates ) {
                printf ( "Ch:%d Sig:%d", dev->channels[dev->channel].channel_nr,
                         dev->last_signal );
                switch ( dev->hw->signal_type ) {
                case NET80211_SIGNAL_NONE:
                        printf ( "?" );
                        break;
                case NET80211_SIGNAL_ARBITRARY:
                        printf ( "/%d", dev->hw->signal_max );
                        break;
                case NET80211_SIGNAL_DB:
                        printf ( "/%d dB", dev->hw->signal_max );
                        break;
                case NET80211_SIGNAL_DBM:
                        printf ( " dBm" );
                        break;
                }
                printf ( ", Qual:%d%% Rate:%d Mbps]\n",
                         ( dev->rx_beacon_interval == 0 ? 0 :
                           100 * dev->tx_beacon_interval /
                           dev->rx_beacon_interval ),
                         dev->rates[dev->rate] / 10 );
        } else {
                printf ( "antenna off]\n" );
        }

        if ( dev->state & NET80211_WORKING ) {
                printf ( "  [associating" );
                if ( dev->associating )
                        printf ( " to '%s'", dev->associating->essid );
                printf ( "...]\n" );
        }
}

/** Identifiers for 802.11 cryptography types, indexed by type number */
static const char *crypto_types[] = {
        [NET80211_CRYPT_NONE] = "Open",
        [NET80211_CRYPT_WEP] = "WEP ",
        [NET80211_CRYPT_TKIP] = "WPA ",
        [NET80211_CRYPT_CCMP] = "WPA2",
        [NET80211_CRYPT_UNKNOWN] = "UNK ",
};

/** Number of 802.11 cryptography types defined */
#define NR_CRYPTO_TYPES ( sizeof ( crypto_types ) / sizeof ( crypto_types[0] ) )

/** Identifiers for 802.11 authentication types, indexed by type number */
static const char *auth_types[] = {
        [NET80211_SECPROT_NONE] = "",
        [NET80211_SECPROT_PSK] = "PSK",
        [NET80211_SECPROT_EAP] = "802.1X",
        [NET80211_SECPROT_UNKNOWN] = "UNK",
};

/** Number of 802.11 authentication types defined */
#define NR_AUTH_TYPES ( sizeof ( auth_types ) / sizeof ( auth_types[0] ) )

/**
 * Scan for wireless networks using 802.11 device
 *
 * @v dev       802.11 device
 * @v active    Whether to use active scanning
 *
 * The list of networks found will be printed in tabular format.
 *
 * This function is safe to call at all times, whether the 802.11
 * device is open or not, but if called while the auto-association
 * task is running it will return an error indication.
 */
int iwlist ( struct net80211_device *dev ) {
        struct net80211_probe_ctx *ctx;
        struct list_head *networks;
        struct net80211_wlan *wlan;
        char ssid_buf[22];
        int rc;
        unsigned i;
        int was_opened = netdev_is_open ( dev->netdev );
        int was_channel = dev->channels[dev->channel].channel_nr;

        if ( ! was_opened ) {
                dev->state |= NET80211_NO_ASSOC;
                rc = netdev_open ( dev->netdev );
                if ( rc < 0 )
                        goto err;
        }

        if ( dev->state & NET80211_WORKING ) {
                rc = -EINVAL;
                goto err_close_netdev;
        }

        if ( ! was_opened ) {
                rc = net80211_prepare_probe ( dev, dev->hw->bands, 0 );
                if ( rc < 0 )
                        goto err_close_netdev;
        }

        ctx = net80211_probe_start ( dev, "", 0 );
        if ( ! ctx ) {
                rc = -ENOMEM;
                goto err_close_netdev;
        }

        while ( ! ( rc = net80211_probe_step ( ctx ) ) ) {
                step();
        }

        networks = net80211_probe_finish_all ( ctx );

        if ( list_empty ( networks ) ) {
                goto err_free_networks;
        }

        rc = 0;

        printf ( "Networks on %s:\n\n", dev->netdev->name );

        /* Output format:
         * 0         1         2         3         4         5         6
         * 0123456789012345678901234567890123456789012345678901234567890
         * [Sig] SSID                  BSSID              Ch  Crypt/Auth
         * -------------------------------------------------------------
         * [ 15] abcdefghijklmnopqrst> 00:00:00:00:00:00  11  Open
         *                                             ... or WPA   PSK etc.
         */

        /* Quoting the dashes and spaces verbatim uses less code space
           than generating them programmatically. */
        printf ( "[Sig] SSID                  BSSID              Ch  Crypt/Auth\n"
                 "-------------------------------------------------------------\n" );

        list_for_each_entry ( wlan, networks, list ) {

                /* Format SSID into 22-character string, space-padded,
                   with '>' indicating truncation */

                snprintf ( ssid_buf, sizeof ( ssid_buf ), "%s", wlan->essid );
                for ( i = strlen ( ssid_buf ); i < sizeof ( ssid_buf ) - 1;
                      i++ )
                        ssid_buf[i] = ' ';
                if ( ssid_buf[sizeof ( ssid_buf ) - 2] != ' ' )
                        ssid_buf[sizeof ( ssid_buf ) - 2] = '>';
                ssid_buf[sizeof ( ssid_buf ) - 1] = 0;

                /* Sanity check */
                if ( wlan->crypto >= NR_CRYPTO_TYPES ||
                     wlan->handshaking >= NR_AUTH_TYPES )
                        continue;

                printf ( "[%3d] %s %s  %2d  %s  %s\n",
                         wlan->signal < 0 ? 100 + wlan->signal : wlan->signal,
                         ssid_buf, eth_ntoa ( wlan->bssid ), wlan->channel,
                         crypto_types[wlan->crypto],
                         auth_types[wlan->handshaking] );
        }
        printf ( "\n" );

 err_free_networks:
        net80211_free_wlanlist ( networks );

 err_close_netdev:
        if ( ! was_opened ) {
                dev->state &= ~NET80211_NO_ASSOC;
                netdev_close ( dev->netdev );
        } else {
                net80211_change_channel ( dev, was_channel );
        }

        if ( ! rc )
                return 0;

 err:
        printf ( "Scanning for networks on %s: %s\n",
                 dev->netdev->name, strerror ( rc ) );
        return rc;
}