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] == 0x3050) || (bc[off] == 0x5030) ||
 241                                  (bc[off] == 0x3051) || (bc[off] == 0x5130) ||
 242                                  (bc[off] == 0x3052) || (bc[off] == 0x5230) ||
 243                                  (bc[off] == 0x3350) || (bc[off] == 0x5033) ||
 244                                  (bc[off] == 0x3352) || (bc[off] == 0x5233) ||
 245                                  (bc[off] == 0x3662) || (bc[off] == 0x6236) ||
 246                                  (bc[off] == 0x3883) || (bc[off] == 0x8338) ||
 247                                  (bc[off] == 0x5350) || (bc[off] == 0x5053))
 248                         {
 249                                 /* vendor: RaLink */
 250                                 id->vendor_id = 0x1814;
 251                                 id->subsystem_vendor_id = 0x1814;
 252
 253                                 /* device */
 254                                 if (((bc[off] & 0xf0) == 0x30) ||
 255                                     ((bc[off] & 0xff) == 0x53))
 256                                         id->device_id = (bc[off] >> 8) | (bc[off] & 0x00ff) << 8;
 257                                 else
 258                                         id->device_id = bc[off];
 259
 260                                 /* subsystem from EEPROM_NIC_CONF0_RF_TYPE */
 261                                 id->subsystem_device_id = (bc[off + 0x1a] & 0x0f00) >> 8;
 262                         } else if ((bc[off] == 0x7620) || (bc[off] == 0x2076) ||
 263                                    (bc[off] == 0x7628) || (bc[off] == 0x2876) ||
 264                                    (bc[off] == 0x7688) || (bc[off] == 0x8876)) {
 265                                 /* vendor: MediaTek */
 266                                 id->vendor_id = 0x14c3;
 267                                 id->subsystem_vendor_id = 0x14c3;
 268
 269                                 /* device */
 270                                 if ((bc[off] & 0xff) == 0x76)
 271                                         id->device_id = (bc[off] >> 8) | (bc[off] & 0x00ff) << 8;
 272                                 else
 273                                         id->device_id = bc[off];
 274
 275                                 /* subsystem from EEPROM_NIC_CONF0_RF_TYPE */
 276                                 id->subsystem_device_id = (bc[off + 0x1a] & 0x0f00) >> 8;
 277                         }
 278                 }
 279
 280                 munmap(bc, len);
 281         }
 282
 283         close(fd);
 284
 285         return (id->vendor_id && id->device_id) ? 0 : -1;
 286 }
 287
 288 static void iwinfo_parse_rsn_cipher(uint8_t idx, uint8_t *ciphers)
 289 {
 290         switch (idx)
 291         {
 292                 case 0:
 293                         *ciphers |= IWINFO_CIPHER_NONE;
 294                         break;
 295
 296                 case 1:
 297                         *ciphers |= IWINFO_CIPHER_WEP40;
 298                         break;
 299
 300                 case 2:
 301                         *ciphers |= IWINFO_CIPHER_TKIP;
 302                         break;
 303
 304                 case 3:  /* WRAP */
 305                         break;
 306
 307                 case 4:
 308                         *ciphers |= IWINFO_CIPHER_CCMP;
 309                         break;
 310
 311                 case 5:
 312                         *ciphers |= IWINFO_CIPHER_WEP104;
 313                         break;
 314
 315                 case 6:  /* AES-128-CMAC */
 316                 case 7:  /* No group addressed */
 317                 case 8:  /* GCMP */
 318                 case 9:  /* GCMP-256 */
 319                 case 10: /* CCMP-256 */
 320                 case 11: /* BIP-GMAC-128 */
 321                 case 12: /* BIP-GMAC-256 */
 322                 case 13: /* BIP-CMAC-256 */
 323                         break;
 324         }
 325 }
 326
 327 void iwinfo_parse_bss_load(struct iwinfo_scanlist_entry *e, uint8_t *data)
 328 {
 329         e->has_bss_load = 1;
 330         e->station_count = ((data[1] << 8) | data[0]);
 331         e->channel_utilization = data[2];
 332         e->admission_capacity = ((data[4] << 8) | data[3]);
 333 }
 334
 335 void iwinfo_parse_rsn(struct iwinfo_crypto_entry *c, uint8_t *data, uint8_t len,
 336                                           uint8_t defcipher, uint8_t defauth)
 337 {
 338         uint16_t i, count;
 339         uint8_t wpa_version = 0;
 340
 341         static unsigned char ms_oui[3]        = { 0x00, 0x50, 0xf2 };
 342         static unsigned char ieee80211_oui[3] = { 0x00, 0x0f, 0xac };
 343
 344         data += 2;
 345         len -= 2;
 346
 347         if (!memcmp(data, ms_oui, 3))
 348                 wpa_version |= 1;
 349         else if (!memcmp(data, ieee80211_oui, 3))
 350                 wpa_version |= 2;
 351
 352         if (len < 4)
 353         {
 354                 c->group_ciphers |= defcipher;
 355                 c->pair_ciphers  |= defcipher;
 356                 c->auth_suites   |= defauth;
 357                 return;
 358         }
 359
 360         if (!memcmp(data, ms_oui, 3) || !memcmp(data, ieee80211_oui, 3))
 361                 iwinfo_parse_rsn_cipher(data[3], &c->group_ciphers);
 362
 363         data += 4;
 364         len -= 4;
 365
 366         if (len < 2)
 367         {
 368                 c->pair_ciphers |= defcipher;
 369                 c->auth_suites  |= defauth;
 370                 return;
 371         }
 372
 373         count = data[0] | (data[1] << 8);
 374         if (2 + (count * 4) > len)
 375                 return;
 376
 377         for (i = 0; i < count; i++)
 378                 if (!memcmp(data + 2 + (i * 4), ms_oui, 3) ||
 379                     !memcmp(data + 2 + (i * 4), ieee80211_oui, 3))
 380                         iwinfo_parse_rsn_cipher(data[2 + (i * 4) + 3], &c->pair_ciphers);
 381
 382         data += 2 + (count * 4);
 383         len -= 2 + (count * 4);
 384
 385         if (len < 2)
 386         {
 387                 c->auth_suites |= defauth;
 388                 return;
 389         }
 390
 391         count = data[0] | (data[1] << 8);
 392         if (2 + (count * 4) > len)
 393                 return;
 394
 395         for (i = 0; i < count; i++)
 396         {
 397                 if (!memcmp(data + 2 + (i * 4), ms_oui, 3) ||
 398                         !memcmp(data + 2 + (i * 4), ieee80211_oui, 3))
 399                 {
 400                         switch (data[2 + (i * 4) + 3])
 401                         {
 402                                 case 1:  /* IEEE 802.1x */
 403                                         c->wpa_version |= wpa_version;
 404                                         c->auth_suites |= IWINFO_KMGMT_8021x;
 405                                         break;
 406
 407                                 case 2:  /* PSK */
 408                                         c->wpa_version |= wpa_version;
 409                                         c->auth_suites |= IWINFO_KMGMT_PSK;
 410                                         break;
 411
 412                                 case 3:  /* FT/IEEE 802.1X */
 413                                 case 4:  /* FT/PSK */
 414                                 case 5:  /* IEEE 802.1X/SHA-256 */
 415                                 case 6:  /* PSK/SHA-256 */
 416                                 case 7:  /* TPK Handshake */
 417                                         break;
 418
 419                                 case 8:  /* SAE */
 420                                         c->wpa_version |= 4;
 421                                         c->auth_suites |= IWINFO_KMGMT_SAE;
 422                                         break;
 423
 424                                 case 9:  /* FT/SAE */
 425                                 case 10: /* undefined */
 426                                         break;
 427
 428                                 case 11: /* 802.1x Suite-B */
 429                                 case 12: /* 802.1x Suite-B-192 */
 430                                         c->wpa_version |= 4;
 431                                         c->auth_suites |= IWINFO_KMGMT_8021x;
 432                                         break;
 433
 434                                 case 13: /* FT/802.1x SHA-384 */
 435                                 case 14: /* FILS SHA-256 */
 436                                 case 15: /* FILS SHA-384 */
 437                                 case 16: /* FT/FILS SHA-256 */
 438                                 case 17: /* FT/FILS SHA-384 */
 439                                         break;
 440
 441                                 case 18: /* OWE */
 442                                         c->wpa_version |= 4;
 443                                         c->auth_suites |= IWINFO_KMGMT_OWE;
 444                                         break;
 445                         }
 446                 }
 447         }
 448
 449         data += 2 + (count * 4);
 450         len -= 2 + (count * 4);
 451 }
 452
 453 struct uci_section *iwinfo_uci_get_radio(const char *name, const char *type)
 454 {
 455         struct uci_ptr ptr = {
 456                 .package = "wireless",
 457                 .section = name,
 458                 .flags = (name && *name == '@') ? UCI_LOOKUP_EXTENDED : 0,
 459         };
 460         const char *opt;
 461
 462         if (!uci_ctx) {
 463                 uci_ctx = uci_alloc_context();
 464                 if (!uci_ctx)
 465                         return NULL;
 466         }
 467
 468         if (uci_lookup_ptr(uci_ctx, &ptr, NULL, true))
 469                 return NULL;
 470
 471         if (!ptr.s || strcmp(ptr.s->type, "wifi-device") != 0)
 472                 return NULL;
 473
 474         opt = uci_lookup_option_string(uci_ctx, ptr.s, "type");
 475         if (!opt || strcmp(opt, type) != 0)
 476                 return NULL;
 477
 478         return ptr.s;
 479 }
 480
 481 void iwinfo_uci_free(void)
 482 {
 483         if (!uci_ctx)
 484                 return;
 485
 486         uci_free_context(uci_ctx);
 487         uci_ctx = NULL;
 488 }
 489
 490
 491 struct iwinfo_ubus_query_state {
 492         const char *ifname;
 493         const char *field;
 494         size_t len;
 495         char *buf;
 496 };
 497
 498 static void iwinfo_ubus_query_cb(struct ubus_request *req, int type,
 499                                  struct blob_attr *msg)
 500 {
 501         struct iwinfo_ubus_query_state *st = req->priv;
 502
 503         struct blobmsg_policy pol1[2] = {
 504                 { "ifname",  BLOBMSG_TYPE_STRING },
 505                 { "config",  BLOBMSG_TYPE_TABLE }
 506         };
 507
 508         struct blobmsg_policy pol2 = { st->field, BLOBMSG_TYPE_STRING };
 509         struct blob_attr *cur, *cur2, *cur3, *cfg[2], *res;
 510         int rem, rem2, rem3;
 511
 512         blobmsg_for_each_attr(cur, msg, rem) {
 513                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE)
 514                         continue;
 515
 516                 blobmsg_for_each_attr(cur2, cur, rem2) {
 517                         if (blobmsg_type(cur2) != BLOBMSG_TYPE_ARRAY)
 518                                 continue;
 519
 520                         if (strcmp(blobmsg_name(cur2), "interfaces"))
 521                                 continue;
 522
 523                         blobmsg_for_each_attr(cur3, cur2, rem3) {
 524                                 blobmsg_parse(pol1, sizeof(pol1) / sizeof(pol1[0]), cfg,
 525                                               blobmsg_data(cur3), blobmsg_len(cur3));
 526
 527                                 if (!cfg[0] || !cfg[1] ||
 528                                     strcmp(blobmsg_get_string(cfg[0]), st->ifname))
 529                                         continue;
 530
 531                                 blobmsg_parse(&pol2, 1, &res,
 532                                               blobmsg_data(cfg[1]), blobmsg_len(cfg[1]));
 533
 534                                 if (!res)
 535                                         continue;
 536
 537                                 strncpy(st->buf, blobmsg_get_string(res), st->len);
 538                                 return;
 539                         }
 540                 }
 541         }
 542 }
 543
 544 int iwinfo_ubus_query(const char *ifname, const char *field,
 545                       char *buf, size_t len)
 546 {
 547         struct iwinfo_ubus_query_state st = {
 548                 .ifname = ifname,
 549                 .field = field,
 550                 .buf = buf,
 551                 .len = len
 552         };
 553
 554         struct ubus_context *ctx = NULL;
 555         struct blob_buf b = { };
 556         int rv = -1;
 557         uint32_t id;
 558
 559         blob_buf_init(&b, 0);
 560
 561         ctx = ubus_connect(NULL);
 562
 563         if (!ctx)
 564                 goto out;
 565
 566         if (ubus_lookup_id(ctx, "network.wireless", &id))
 567                 goto out;
 568
 569         if (ubus_invoke(ctx, id, "status", b.head, iwinfo_ubus_query_cb, &st, 250))
 570                 goto out;
 571
 572         rv = 0;
 573
 574 out:
 575         if (ctx)
 576                 ubus_free(ctx);
 577
 578         blob_buf_free(&b);
 579
 580         return rv;
 581 }