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 struct uci_context *uci_ctx = NULL;
  28
  29 static int iwinfo_ioctl_socket(void)
  30 {
  31         /* Prepare socket */
  32         if (ioctl_socket == -1)
  33         {
  34                 ioctl_socket = socket(AF_INET, SOCK_DGRAM, 0);
  35                 fcntl(ioctl_socket, F_SETFD, fcntl(ioctl_socket, F_GETFD) | FD_CLOEXEC);
  36         }
  37
  38         return ioctl_socket;
  39 }
  40
  41 int iwinfo_ioctl(int cmd, void *ifr)
  42 {
  43         int s = iwinfo_ioctl_socket();
  44         return ioctl(s, cmd, ifr);
  45 }
  46
  47 int iwinfo_dbm2mw(int in)
  48 {
  49         double res = 1.0;
  50         int ip = in / 10;
  51         int fp = in % 10;
  52         int k;
  53
  54         for(k = 0; k < ip; k++) res *= 10;
  55         for(k = 0; k < fp; k++) res *= LOG10_MAGIC;
  56
  57         return (int)res;
  58 }
  59
  60 int iwinfo_mw2dbm(int in)
  61 {
  62         double fin = (double) in;
  63         int res = 0;
  64
  65         while(fin > 10.0)
  66         {
  67                 res += 10;
  68                 fin /= 10.0;
  69         }
  70
  71         while(fin > 1.000001)
  72         {
  73                 res += 1;
  74                 fin /= LOG10_MAGIC;
  75         }
  76
  77         return (int)res;
  78 }
  79
  80 int iwinfo_ifup(const char *ifname)
  81 {
  82         struct ifreq ifr;
  83
  84         strncpy(ifr.ifr_name, ifname, IFNAMSIZ - 1);
  85
  86         if (iwinfo_ioctl(SIOCGIFFLAGS, &ifr))
  87                 return 0;
  88
  89         ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
  90
  91         return !iwinfo_ioctl(SIOCSIFFLAGS, &ifr);
  92 }
  93
  94 int iwinfo_ifdown(const char *ifname)
  95 {
  96         struct ifreq ifr;
  97
  98         strncpy(ifr.ifr_name, ifname, IFNAMSIZ - 1);
  99
 100         if (iwinfo_ioctl(SIOCGIFFLAGS, &ifr))
 101                 return 0;
 102
 103         ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
 104
 105         return !iwinfo_ioctl(SIOCSIFFLAGS, &ifr);
 106 }
 107
 108 int iwinfo_ifmac(const char *ifname)
 109 {
 110         struct ifreq ifr;
 111
 112         strncpy(ifr.ifr_name, ifname, IFNAMSIZ - 1);
 113
 114         if (iwinfo_ioctl(SIOCGIFHWADDR, &ifr))
 115                 return 0;
 116
 117         ifr.ifr_hwaddr.sa_data[0] |= 0x02;
 118         ifr.ifr_hwaddr.sa_data[1]++;
 119         ifr.ifr_hwaddr.sa_data[2]++;
 120
 121         return !iwinfo_ioctl(SIOCSIFHWADDR, &ifr);
 122 }
 123
 124 void iwinfo_close(void)
 125 {
 126         if (ioctl_socket > -1)
 127                 close(ioctl_socket);
 128
 129         ioctl_socket = -1;
 130 }
 131
 132 struct iwinfo_hardware_entry * iwinfo_hardware(struct iwinfo_hardware_id *id)
 133 {
 134         FILE *db;
 135         char buf[256] = { 0 };
 136         static struct iwinfo_hardware_entry e;
 137         struct iwinfo_hardware_entry *rv = NULL;
 138
 139         if (!(db = fopen(IWINFO_HARDWARE_FILE, "r")))
 140                 return NULL;
 141
 142         while (fgets(buf, sizeof(buf) - 1, db) != NULL)
 143         {
 144                 memset(&e, 0, sizeof(e));
 145
 146                 if (sscanf(buf, "%hx %hx %hx %hx %hd %hd \"%63[^\"]\" \"%63[^\"]\"",
 147                                &e.vendor_id, &e.device_id,
 148                                &e.subsystem_vendor_id, &e.subsystem_device_id,
 149                                &e.txpower_offset, &e.frequency_offset,
 150                                e.vendor_name, e.device_name) < 8)
 151                         continue;
 152
 153                 if ((e.vendor_id != 0xffff) && (e.vendor_id != id->vendor_id))
 154                         continue;
 155
 156                 if ((e.device_id != 0xffff) && (e.device_id != id->device_id))
 157                         continue;
 158
 159                 if ((e.subsystem_vendor_id != 0xffff) &&
 160                         (e.subsystem_vendor_id != id->subsystem_vendor_id))
 161                         continue;
 162
 163                 if ((e.subsystem_device_id != 0xffff) &&
 164                         (e.subsystem_device_id != id->subsystem_device_id))
 165                         continue;
 166
 167                 rv = &e;
 168                 break;
 169         }
 170
 171         fclose(db);
 172         return rv;
 173 }
 174
 175 int iwinfo_hardware_id_from_mtd(struct iwinfo_hardware_id *id)
 176 {
 177         FILE *mtd;
 178         uint16_t *bc;
 179
 180         int fd, off;
 181         unsigned int len;
 182         char buf[128];
 183
 184         if (!(mtd = fopen("/proc/mtd", "r")))
 185                 return -1;
 186
 187         while (fgets(buf, sizeof(buf), mtd) != NULL)
 188         {
 189                 if (fscanf(mtd, "mtd%d: %x %*x %127s", &off, &len, buf) < 3 ||
 190                     (strcmp(buf, "\"boardconfig\"") && strcmp(buf, "\"EEPROM\"") &&
 191                      strcmp(buf, "\"factory\"")))
 192                 {
 193                         off = -1;
 194                         continue;
 195                 }
 196
 197                 break;
 198         }
 199
 200         fclose(mtd);
 201
 202         if (off < 0)
 203                 return -1;
 204
 205         snprintf(buf, sizeof(buf), "/dev/mtdblock%d", off);
 206
 207         if ((fd = open(buf, O_RDONLY)) < 0)
 208                 return -1;
 209
 210         bc = mmap(NULL, len, PROT_READ, MAP_PRIVATE|MAP_LOCKED, fd, 0);
 211
 212         if ((void *)bc != MAP_FAILED)
 213         {
 214                 id->vendor_id = 0;
 215                 id->device_id = 0;
 216
 217                 for (off = len / 2 - 0x800; off >= 0; off -= 0x800)
 218                 {
 219                         /* AR531X board data magic */
 220                         if ((bc[off] == 0x3533) && (bc[off + 1] == 0x3131))
 221                         {
 222                                 id->vendor_id = bc[off + 0x7d];
 223                                 id->device_id = bc[off + 0x7c];
 224                                 id->subsystem_vendor_id = bc[off + 0x84];
 225                                 id->subsystem_device_id = bc[off + 0x83];
 226                                 break;
 227                         }
 228
 229                         /* AR5416 EEPROM magic */
 230                         else if ((bc[off] == 0xA55A) || (bc[off] == 0x5AA5))
 231                         {
 232                                 id->vendor_id = bc[off + 0x0D];
 233                                 id->device_id = bc[off + 0x0E];
 234                                 id->subsystem_vendor_id = bc[off + 0x13];
 235                                 id->subsystem_device_id = bc[off + 0x14];
 236                                 break;
 237                         }
 238
 239                         /* Rt3xxx SoC */
 240                         else if ((bc[off] == 0x3352) || (bc[off] == 0x5233) ||
 241                                  (bc[off] == 0x3350) || (bc[off] == 0x5033) ||
 242                                  (bc[off] == 0x3050) || (bc[off] == 0x5030) ||
 243                                  (bc[off] == 0x3052) || (bc[off] == 0x5230))
 244                         {
 245                                 /* vendor: RaLink */
 246                                 id->vendor_id = 0x1814;
 247                                 id->subsystem_vendor_id = 0x1814;
 248
 249                                 /* device */
 250                                 if ((bc[off] & 0xf0) == 0x30)
 251                                         id->device_id = (bc[off] >> 8) | (bc[off] & 0x00ff) << 8;
 252                                 else
 253                                         id->device_id = bc[off];
 254
 255                                 /* subsystem from EEPROM_NIC_CONF0_RF_TYPE */
 256                                 id->subsystem_device_id = (bc[off + 0x1a] & 0x0f00) >> 8;
 257                         }
 258                 }
 259
 260                 munmap(bc, len);
 261         }
 262
 263         close(fd);
 264
 265         return (id->vendor_id && id->device_id) ? 0 : -1;
 266 }
 267
 268 void iwinfo_parse_rsn(struct iwinfo_crypto_entry *c, uint8_t *data, uint8_t len,
 269                                           uint8_t defcipher, uint8_t defauth)
 270 {
 271         uint16_t i, count;
 272
 273         static unsigned char ms_oui[3]        = { 0x00, 0x50, 0xf2 };
 274         static unsigned char ieee80211_oui[3] = { 0x00, 0x0f, 0xac };
 275
 276         data += 2;
 277         len -= 2;
 278
 279         if (!memcmp(data, ms_oui, 3))
 280                 c->wpa_version += 1;
 281         else if (!memcmp(data, ieee80211_oui, 3))
 282                 c->wpa_version += 2;
 283
 284         if (len < 4)
 285         {
 286                 c->group_ciphers |= defcipher;
 287                 c->pair_ciphers  |= defcipher;
 288                 c->auth_suites   |= defauth;
 289                 return;
 290         }
 291
 292         if (!memcmp(data, ms_oui, 3) || !memcmp(data, ieee80211_oui, 3))
 293         {
 294                 switch (data[3])
 295                 {
 296                         case 1: c->group_ciphers |= IWINFO_CIPHER_WEP40;  break;
 297                         case 2: c->group_ciphers |= IWINFO_CIPHER_TKIP;   break;
 298                         case 4: c->group_ciphers |= IWINFO_CIPHER_CCMP;   break;
 299                         case 5: c->group_ciphers |= IWINFO_CIPHER_WEP104; break;
 300                         case 6:  /* AES-128-CMAC */ break;
 301                         default: /* proprietary */  break;
 302                 }
 303         }
 304
 305         data += 4;
 306         len -= 4;
 307
 308         if (len < 2)
 309         {
 310                 c->pair_ciphers |= defcipher;
 311                 c->auth_suites  |= defauth;
 312                 return;
 313         }
 314
 315         count = data[0] | (data[1] << 8);
 316         if (2 + (count * 4) > len)
 317                 return;
 318
 319         for (i = 0; i < count; i++)
 320         {
 321                 if (!memcmp(data + 2 + (i * 4), ms_oui, 3) ||
 322                         !memcmp(data + 2 + (i * 4), ieee80211_oui, 3))
 323                 {
 324                         switch (data[2 + (i * 4) + 3])
 325                         {
 326                                 case 1: c->pair_ciphers |= IWINFO_CIPHER_WEP40;  break;
 327                                 case 2: c->pair_ciphers |= IWINFO_CIPHER_TKIP;   break;
 328                                 case 4: c->pair_ciphers |= IWINFO_CIPHER_CCMP;   break;
 329                                 case 5: c->pair_ciphers |= IWINFO_CIPHER_WEP104; break;
 330                                 case 6:  /* AES-128-CMAC */ break;
 331                                 default: /* proprietary */  break;
 332                         }
 333                 }
 334         }
 335
 336         data += 2 + (count * 4);
 337         len -= 2 + (count * 4);
 338
 339         if (len < 2)
 340         {
 341                 c->auth_suites |= defauth;
 342                 return;
 343         }
 344
 345         count = data[0] | (data[1] << 8);
 346         if (2 + (count * 4) > len)
 347                 return;
 348
 349         for (i = 0; i < count; i++)
 350         {
 351                 if (!memcmp(data + 2 + (i * 4), ms_oui, 3) ||
 352                         !memcmp(data + 2 + (i * 4), ieee80211_oui, 3))
 353                 {
 354                         switch (data[2 + (i * 4) + 3])
 355                         {
 356                                 case 1: c->auth_suites |= IWINFO_KMGMT_8021x; break;
 357                                 case 2: c->auth_suites |= IWINFO_KMGMT_PSK;   break;
 358                                 case 3:  /* FT/IEEE 802.1X */                 break;
 359                                 case 4:  /* FT/PSK */                         break;
 360                                 case 5:  /* IEEE 802.1X/SHA-256 */            break;
 361                                 case 6:  /* PSK/SHA-256 */                    break;
 362                                 default: /* proprietary */                    break;
 363                         }
 364                 }
 365         }
 366
 367         data += 2 + (count * 4);
 368         len -= 2 + (count * 4);
 369 }
 370
 371 struct uci_section *iwinfo_uci_get_radio(const char *name, const char *type)
 372 {
 373         struct uci_ptr ptr = {
 374                 .package = "wireless",
 375                 .section = name,
 376                 .flags = (name && *name == '@') ? UCI_LOOKUP_EXTENDED : 0,
 377         };
 378         const char *opt;
 379
 380         if (!uci_ctx) {
 381                 uci_ctx = uci_alloc_context();
 382                 if (!uci_ctx)
 383                         return NULL;
 384         }
 385
 386         if (uci_lookup_ptr(uci_ctx, &ptr, NULL, true))
 387                 return NULL;
 388
 389         if (!ptr.s || strcmp(ptr.s->type, "wifi-device") != 0)
 390                 return NULL;
 391
 392         opt = uci_lookup_option_string(uci_ctx, ptr.s, "type");
 393         if (!opt || strcmp(opt, type) != 0)
 394                 return NULL;
 395
 396         return ptr.s;
 397 }
 398
 399 void iwinfo_uci_free(void)
 400 {
 401         if (!uci_ctx)
 402                 return;
 403
 404         uci_free_context(uci_ctx);
 405         uci_ctx = NULL;
 406 }