iwinfo_utils.c

   1 /*
   2  * iwinfo - Wireless Information Library - Shared utility routines
   3  *
   4  *   Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
   5  *
   6  * The iwinfo library is free software: you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  * The iwinfo library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with the iwinfo library. If not, see http://www.gnu.org/licenses/.
  17  *
  18  * The signal handling code is derived from the official madwifi tools,
  19  * wlanconfig.c in particular. The encryption property handling was
  20  * inspired by the hostapd madwifi driver.
  21  */
  22
  23 #include "iwinfo/utils.h"
  24
  25
  26 static int ioctl_socket = -1;
  27
  28 static int iwinfo_ioctl_socket(void)
  29 {
  30         /* Prepare socket */
  31         if (ioctl_socket == -1)
  32         {
  33                 ioctl_socket = socket(AF_INET, SOCK_DGRAM, 0);
  34                 fcntl(ioctl_socket, F_SETFD, fcntl(ioctl_socket, F_GETFD) | FD_CLOEXEC);
  35         }
  36
  37         return ioctl_socket;
  38 }
  39
  40 int iwinfo_ioctl(int cmd, void *ifr)
  41 {
  42         int s = iwinfo_ioctl_socket();
  43         return ioctl(s, cmd, ifr);
  44 }
  45
  46 int iwinfo_dbm2mw(int in)
  47 {
  48         double res = 1.0;
  49         int ip = in / 10;
  50         int fp = in % 10;
  51         int k;
  52
  53         for(k = 0; k < ip; k++) res *= 10;
  54         for(k = 0; k < fp; k++) res *= LOG10_MAGIC;
  55
  56         return (int)res;
  57 }
  58
  59 int iwinfo_mw2dbm(int in)
  60 {
  61         double fin = (double) in;
  62         int res = 0;
  63
  64         while(fin > 10.0)
  65         {
  66                 res += 10;
  67                 fin /= 10.0;
  68         }
  69
  70         while(fin > 1.000001)
  71         {
  72                 res += 1;
  73                 fin /= LOG10_MAGIC;
  74         }
  75
  76         return (int)res;
  77 }
  78
  79 int iwinfo_ifup(const char *ifname)
  80 {
  81         struct ifreq ifr;
  82
  83         strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
  84
  85         if (iwinfo_ioctl(SIOCGIFFLAGS, &ifr))
  86                 return 0;
  87
  88         ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
  89
  90         return !iwinfo_ioctl(SIOCSIFFLAGS, &ifr);
  91 }
  92
  93 int iwinfo_ifdown(const char *ifname)
  94 {
  95         struct ifreq ifr;
  96
  97         strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
  98
  99         if (iwinfo_ioctl(SIOCGIFFLAGS, &ifr))
 100                 return 0;
 101
 102         ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
 103
 104         return !iwinfo_ioctl(SIOCSIFFLAGS, &ifr);
 105 }
 106
 107 int iwinfo_ifmac(const char *ifname)
 108 {
 109         struct ifreq ifr;
 110
 111         strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
 112
 113         if (iwinfo_ioctl(SIOCGIFHWADDR, &ifr))
 114                 return 0;
 115
 116         ifr.ifr_hwaddr.sa_data[0] |= 0x02;
 117         ifr.ifr_hwaddr.sa_data[1]++;
 118         ifr.ifr_hwaddr.sa_data[2]++;
 119
 120         return !iwinfo_ioctl(SIOCSIFHWADDR, &ifr);
 121 }
 122
 123 void iwinfo_close(void)
 124 {
 125         if (ioctl_socket > -1)
 126                 close(ioctl_socket);
 127
 128         ioctl_socket = -1;
 129 }
 130
 131 struct iwinfo_hardware_entry * iwinfo_hardware(struct iwinfo_hardware_id *id)
 132 {
 133         FILE *db;
 134         char buf[256] = { 0 };
 135         static struct iwinfo_hardware_entry e;
 136         struct iwinfo_hardware_entry *rv = NULL;
 137
 138         if (!(db = fopen(IWINFO_HARDWARE_FILE, "r")))
 139                 return NULL;
 140
 141         while (fgets(buf, sizeof(buf) - 1, db) != NULL)
 142         {
 143                 memset(&e, 0, sizeof(e));
 144
 145                 if (sscanf(buf, "%hx %hx %hx %hx %hd %hd \"%63[^\"]\" \"%63[^\"]\"",
 146                                &e.vendor_id, &e.device_id,
 147                                &e.subsystem_vendor_id, &e.subsystem_device_id,
 148                                &e.txpower_offset, &e.frequency_offset,
 149                                e.vendor_name, e.device_name) < 8)
 150                         continue;
 151
 152                 if ((e.vendor_id != 0xffff) && (e.vendor_id != id->vendor_id))
 153                         continue;
 154
 155                 if ((e.device_id != 0xffff) && (e.device_id != id->device_id))
 156                         continue;
 157
 158                 if ((e.subsystem_vendor_id != 0xffff) &&
 159                         (e.subsystem_vendor_id != id->subsystem_vendor_id))
 160                         continue;
 161
 162                 if ((e.subsystem_device_id != 0xffff) &&
 163                         (e.subsystem_device_id != id->subsystem_device_id))
 164                         continue;
 165
 166                 rv = &e;
 167                 break;
 168         }
 169
 170         fclose(db);
 171         return rv;
 172 }
 173
 174 int iwinfo_hardware_id_from_mtd(struct iwinfo_hardware_id *id)
 175 {
 176         FILE *mtd;
 177         uint16_t *bc;
 178
 179         int fd, len, off;
 180         char buf[128];
 181
 182         if (!(mtd = fopen("/proc/mtd", "r")))
 183                 return -1;
 184
 185         while (fgets(buf, sizeof(buf), mtd) > 0)
 186         {
 187                 if (fscanf(mtd, "mtd%d: %x %*x %127s", &off, &len, buf) < 3 ||
 188                     (strcmp(buf, "\"boardconfig\"") && strcmp(buf, "\"EEPROM\"") &&
 189                      strcmp(buf, "\"factory\"")))
 190                 {
 191                         off = -1;
 192                         continue;
 193                 }
 194
 195                 break;
 196         }
 197
 198         fclose(mtd);
 199
 200         if (off < 0)
 201                 return -1;
 202
 203         snprintf(buf, sizeof(buf), "/dev/mtdblock%d", off);
 204
 205         if ((fd = open(buf, O_RDONLY)) < 0)
 206                 return -1;
 207
 208         bc = mmap(NULL, len, PROT_READ, MAP_PRIVATE|MAP_LOCKED, fd, 0);
 209
 210         if ((void *)bc != MAP_FAILED)
 211         {
 212                 id->vendor_id = 0;
 213                 id->device_id = 0;
 214
 215                 for (off = len / 2 - 0x800; off >= 0; off -= 0x800)
 216                 {
 217                         /* AR531X board data magic */
 218                         if ((bc[off] == 0x3533) && (bc[off + 1] == 0x3131))
 219                         {
 220                                 id->vendor_id = bc[off + 0x7d];
 221                                 id->device_id = bc[off + 0x7c];
 222                                 id->subsystem_vendor_id = bc[off + 0x84];
 223                                 id->subsystem_device_id = bc[off + 0x83];
 224                                 break;
 225                         }
 226
 227                         /* AR5416 EEPROM magic */
 228                         else if ((bc[off] == 0xA55A) || (bc[off] == 0x5AA5))
 229                         {
 230                                 id->vendor_id = bc[off + 0x0D];
 231                                 id->device_id = bc[off + 0x0E];
 232                                 id->subsystem_vendor_id = bc[off + 0x13];
 233                                 id->subsystem_device_id = bc[off + 0x14];
 234                                 break;
 235                         }
 236
 237                         /* Rt3xxx SoC */
 238                         else if ((bc[off] == 0x3352) || (bc[off] == 0x5233) ||
 239                                  (bc[off] == 0x3350) || (bc[off] == 0x5033) ||
 240                                  (bc[off] == 0x3050) || (bc[off] == 0x5030) ||
 241                                  (bc[off] == 0x3052) || (bc[off] == 0x5230))
 242                         {
 243                                 /* vendor: RaLink */
 244                                 id->vendor_id = 0x1814;
 245                                 id->subsystem_vendor_id = 0x1814;
 246
 247                                 /* device */
 248                                 if (bc[off] & 0xf0 == 0x30)
 249                                         id->device_id = (bc[off] >> 8) | (bc[off] & 0x00ff) << 8;
 250                                 else
 251                                         id->device_id = bc[off];
 252
 253                                 /* subsystem from EEPROM_NIC_CONF0_RF_TYPE */
 254                                 id->subsystem_device_id = (bc[off + 0x1a] & 0x0f00) >> 8;
 255                         }
 256                 }
 257
 258                 munmap(bc, len);
 259         }
 260
 261         close(fd);
 262
 263         return (id->vendor_id && id->device_id) ? 0 : -1;
 264 }
 265
 266 void iwinfo_parse_rsn(struct iwinfo_crypto_entry *c, uint8_t *data, uint8_t len,
 267                                           uint8_t defcipher, uint8_t defauth)
 268 {
 269         uint16_t i, count;
 270
 271         static unsigned char ms_oui[3]        = { 0x00, 0x50, 0xf2 };
 272         static unsigned char ieee80211_oui[3] = { 0x00, 0x0f, 0xac };
 273
 274         data += 2;
 275         len -= 2;
 276
 277         if (!memcmp(data, ms_oui, 3))
 278                 c->wpa_version += 1;
 279         else if (!memcmp(data, ieee80211_oui, 3))
 280                 c->wpa_version += 2;
 281
 282         if (len < 4)
 283         {
 284                 c->group_ciphers |= defcipher;
 285                 c->pair_ciphers  |= defcipher;
 286                 c->auth_suites   |= defauth;
 287                 return;
 288         }
 289
 290         if (!memcmp(data, ms_oui, 3) || !memcmp(data, ieee80211_oui, 3))
 291         {
 292                 switch (data[3])
 293                 {
 294                         case 1: c->group_ciphers |= IWINFO_CIPHER_WEP40;  break;
 295                         case 2: c->group_ciphers |= IWINFO_CIPHER_TKIP;   break;
 296                         case 4: c->group_ciphers |= IWINFO_CIPHER_CCMP;   break;
 297                         case 5: c->group_ciphers |= IWINFO_CIPHER_WEP104; break;
 298                         case 6:  /* AES-128-CMAC */ break;
 299                         default: /* proprietary */  break;
 300                 }
 301         }
 302
 303         data += 4;
 304         len -= 4;
 305
 306         if (len < 2)
 307         {
 308                 c->pair_ciphers |= defcipher;
 309                 c->auth_suites  |= defauth;
 310                 return;
 311         }
 312
 313         count = data[0] | (data[1] << 8);
 314         if (2 + (count * 4) > len)
 315                 return;
 316
 317         for (i = 0; i < count; i++)
 318         {
 319                 if (!memcmp(data + 2 + (i * 4), ms_oui, 3) ||
 320                         !memcmp(data + 2 + (i * 4), ieee80211_oui, 3))
 321                 {
 322                         switch (data[2 + (i * 4) + 3])
 323                         {
 324                                 case 1: c->pair_ciphers |= IWINFO_CIPHER_WEP40;  break;
 325                                 case 2: c->pair_ciphers |= IWINFO_CIPHER_TKIP;   break;
 326                                 case 4: c->pair_ciphers |= IWINFO_CIPHER_CCMP;   break;
 327                                 case 5: c->pair_ciphers |= IWINFO_CIPHER_WEP104; break;
 328                                 case 6:  /* AES-128-CMAC */ break;
 329                                 default: /* proprietary */  break;
 330                         }
 331                 }
 332         }
 333
 334         data += 2 + (count * 4);
 335         len -= 2 + (count * 4);
 336
 337         if (len < 2)
 338         {
 339                 c->auth_suites |= defauth;
 340                 return;
 341         }
 342
 343         count = data[0] | (data[1] << 8);
 344         if (2 + (count * 4) > len)
 345                 return;
 346
 347         for (i = 0; i < count; i++)
 348         {
 349                 if (!memcmp(data + 2 + (i * 4), ms_oui, 3) ||
 350                         !memcmp(data + 2 + (i * 4), ieee80211_oui, 3))
 351                 {
 352                         switch (data[2 + (i * 4) + 3])
 353                         {
 354                                 case 1: c->auth_suites |= IWINFO_KMGMT_8021x; break;
 355                                 case 2: c->auth_suites |= IWINFO_KMGMT_PSK;   break;
 356                                 case 3:  /* FT/IEEE 802.1X */                 break;
 357                                 case 4:  /* FT/PSK */                         break;
 358                                 case 5:  /* IEEE 802.1X/SHA-256 */            break;
 359                                 case 6:  /* PSK/SHA-256 */                    break;
 360                                 default: /* proprietary */                    break;
 361                         }
 362                 }
 363         }
 364
 365         data += 2 + (count * 4);
 366         len -= 2 + (count * 4);
 367 }