src/usr/iwmgmt.c

   1 /*
   2  * Copyright (C) 2009 Joshua Oreman <oremanj@rwcr.net>.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 FILE_LICENCE ( GPL2_OR_LATER );
  20
  21 #include <stdio.h>
  22 #include <console.h>
  23 #include <string.h>
  24 #include <errno.h>
  25 #include <gpxe/net80211.h>
  26 #include <gpxe/ethernet.h>
  27 #include <usr/ifmgmt.h>
  28 #include <usr/iwmgmt.h>
  29
  30 /** @file
  31  *
  32  * Wireless network interface management
  33  *
  34  */
  35
  36 /**
  37  * Print status of 802.11 device
  38  *
  39  * @v dev       802.11 device
  40  */
  41 void iwstat ( struct net80211_device *dev ) {
  42
  43         ifstat ( dev->netdev );
  44
  45         printf ( "  [802.11 ");
  46         if ( dev->state & NET80211_ASSOCIATED ) {
  47                 printf ( "SSID '%s', ", dev->essid );
  48         } else {
  49                 printf ( "not associated, " );
  50         }
  51         if ( dev->channel < dev->nr_channels && dev->rate < dev->nr_rates ) {
  52                 printf ( "Ch:%d Sig:%d", dev->channels[dev->channel].channel_nr,
  53                          dev->last_signal );
  54                 switch ( dev->hw->signal_type ) {
  55                 case NET80211_SIGNAL_NONE:
  56                         printf ( "?" );
  57                         break;
  58                 case NET80211_SIGNAL_ARBITRARY:
  59                         printf ( "/%d", dev->hw->signal_max );
  60                         break;
  61                 case NET80211_SIGNAL_DB:
  62                         printf ( "/%d dB", dev->hw->signal_max );
  63                         break;
  64                 case NET80211_SIGNAL_DBM:
  65                         printf ( " dBm" );
  66                         break;
  67                 }
  68                 printf ( ", Qual:%d%% Rate:%d Mbps]\n",
  69                          ( dev->rx_beacon_interval == 0 ? 0 :
  70                            100 * dev->tx_beacon_interval /
  71                            dev->rx_beacon_interval ),
  72                          dev->rates[dev->rate] / 10 );
  73         } else {
  74                 printf ( "antenna off]\n" );
  75         }
  76
  77         if ( dev->state & NET80211_WORKING ) {
  78                 printf ( "  [associating" );
  79                 if ( dev->associating )
  80                         printf ( " to '%s'", dev->associating->essid );
  81                 printf ( "...]\n" );
  82         }
  83 }
  84
  85 /** Identifiers for 802.11 cryptography types, indexed by type number */
  86 static const char *crypto_types[] = {
  87         [NET80211_CRYPT_NONE] = "Open",
  88         [NET80211_CRYPT_WEP] = "WEP ",
  89         [NET80211_CRYPT_TKIP] = "WPA ",
  90         [NET80211_CRYPT_CCMP] = "WPA2",
  91         [NET80211_CRYPT_UNKNOWN] = "UNK ",
  92 };
  93
  94 /** Number of 802.11 cryptography types defined */
  95 #define NR_CRYPTO_TYPES ( sizeof ( crypto_types ) / sizeof ( crypto_types[0] ) )
  96
  97 /** Identifiers for 802.11 authentication types, indexed by type number */
  98 static const char *auth_types[] = {
  99         [NET80211_SECPROT_NONE] = "",
 100         [NET80211_SECPROT_PSK] = "PSK",
 101         [NET80211_SECPROT_EAP] = "802.1X",
 102         [NET80211_SECPROT_UNKNOWN] = "UNK",
 103 };
 104
 105 /** Number of 802.11 authentication types defined */
 106 #define NR_AUTH_TYPES ( sizeof ( auth_types ) / sizeof ( auth_types[0] ) )
 107
 108 /**
 109  * Scan for wireless networks using 802.11 device
 110  *
 111  * @v dev       802.11 device
 112  * @v active    Whether to use active scanning
 113  *
 114  * The list of networks found will be printed in tabular format.
 115  *
 116  * This function is safe to call at all times, whether the 802.11
 117  * device is open or not, but if called while the auto-association
 118  * task is running it will return an error indication.
 119  */
 120 int iwlist ( struct net80211_device *dev ) {
 121         struct net80211_probe_ctx *ctx;
 122         struct list_head *networks;
 123         struct net80211_wlan *wlan;
 124         char ssid_buf[22];
 125         int rc;
 126         unsigned i;
 127         int was_opened = netdev_is_open ( dev->netdev );
 128         int was_channel = dev->channels[dev->channel].channel_nr;
 129
 130         if ( ! was_opened ) {
 131                 dev->state |= NET80211_NO_ASSOC;
 132                 rc = netdev_open ( dev->netdev );
 133                 if ( rc < 0 )
 134                         goto err;
 135         }
 136
 137         if ( dev->state & NET80211_WORKING ) {
 138                 rc = -EINVAL;
 139                 goto err_close_netdev;
 140         }
 141
 142         if ( ! was_opened ) {
 143                 rc = net80211_prepare_probe ( dev, dev->hw->bands, 0 );
 144                 if ( rc < 0 )
 145                         goto err_close_netdev;
 146         }
 147
 148         ctx = net80211_probe_start ( dev, "", 0 );
 149         if ( ! ctx ) {
 150                 rc = -ENOMEM;
 151                 goto err_close_netdev;
 152         }
 153
 154         while ( ! ( rc = net80211_probe_step ( ctx ) ) ) {
 155                 step();
 156         }
 157
 158         networks = net80211_probe_finish_all ( ctx );
 159
 160         if ( list_empty ( networks ) ) {
 161                 goto err_free_networks;
 162         }
 163
 164         rc = 0;
 165
 166         printf ( "Networks on %s:\n\n", dev->netdev->name );
 167
 168         /* Output format:
 169          * 0         1         2         3         4         5         6
 170          * 0123456789012345678901234567890123456789012345678901234567890
 171          * [Sig] SSID                  BSSID              Ch  Crypt/Auth
 172          * -------------------------------------------------------------
 173          * [ 15] abcdefghijklmnopqrst> 00:00:00:00:00:00  11  Open
 174          *                                             ... or WPA   PSK etc.
 175          */
 176
 177         /* Quoting the dashes and spaces verbatim uses less code space
 178            than generating them programmatically. */
 179         printf ( "[Sig] SSID                  BSSID              Ch  Crypt/Auth\n"
 180                  "-------------------------------------------------------------\n" );
 181
 182         list_for_each_entry ( wlan, networks, list ) {
 183
 184                 /* Format SSID into 22-character string, space-padded,
 185                    with '>' indicating truncation */
 186
 187                 snprintf ( ssid_buf, sizeof ( ssid_buf ), "%s", wlan->essid );
 188                 for ( i = strlen ( ssid_buf ); i < sizeof ( ssid_buf ) - 1;
 189                       i++ )
 190                         ssid_buf[i] = ' ';
 191                 if ( ssid_buf[sizeof ( ssid_buf ) - 2] != ' ' )
 192                         ssid_buf[sizeof ( ssid_buf ) - 2] = '>';
 193                 ssid_buf[sizeof ( ssid_buf ) - 1] = 0;
 194
 195                 /* Sanity check */
 196                 if ( wlan->crypto >= NR_CRYPTO_TYPES ||
 197                      wlan->handshaking >= NR_AUTH_TYPES )
 198                         continue;
 199
 200                 printf ( "[%3d] %s %s  %2d  %s  %s\n",
 201                          wlan->signal < 0 ? 100 + wlan->signal : wlan->signal,
 202                          ssid_buf, eth_ntoa ( wlan->bssid ), wlan->channel,
 203                          crypto_types[wlan->crypto],
 204                          auth_types[wlan->handshaking] );
 205         }
 206         printf ( "\n" );
 207
 208  err_free_networks:
 209         net80211_free_wlanlist ( networks );
 210
 211  err_close_netdev:
 212         if ( ! was_opened ) {
 213                 dev->state &= ~NET80211_NO_ASSOC;
 214                 netdev_close ( dev->netdev );
 215         } else {
 216                 net80211_change_channel ( dev, was_channel );
 217         }
 218
 219         if ( ! rc )
 220                 return 0;
 221
 222  err:
 223         printf ( "Scanning for networks on %s: %s\n",
 224                  dev->netdev->name, strerror ( rc ) );
 225         return rc;
 226 }