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 size_t iwinfo_format_hwmodes(int modes, char *buf, size_t len)
  81 {
  82         // bit numbers as per IWINFO_80211_*:  ad ac ax  a  b  g  n
  83         const int order[IWINFO_80211_COUNT] = { 5, 4, 6, 0, 1, 2, 3 };
  84         size_t res = 0;
  85         int i;
  86
  87         *buf = 0;
  88
  89         if (!(modes & ((1 << IWINFO_80211_COUNT) - 1)))
  90                 return 0;
  91
  92         for (i = 0; i < IWINFO_80211_COUNT; i++)
  93                 if (modes & 1 << order[i])
  94                         res += snprintf(buf + res, len - res, "%s/", IWINFO_80211_NAMES[order[i]]);
  95
  96         if (res > 0)
  97         {
  98                 res--;
  99                 buf[res] = 0;
 100         }
 101
 102         return res;
 103 }
 104
 105 int iwinfo_ifup(const char *ifname)
 106 {
 107         struct ifreq ifr;
 108
 109         strncpy(ifr.ifr_name, ifname, IFNAMSIZ - 1);
 110
 111         if (iwinfo_ioctl(SIOCGIFFLAGS, &ifr))
 112                 return 0;
 113
 114         ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
 115
 116         return !iwinfo_ioctl(SIOCSIFFLAGS, &ifr);
 117 }
 118
 119 int iwinfo_ifdown(const char *ifname)
 120 {
 121         struct ifreq ifr;
 122
 123         strncpy(ifr.ifr_name, ifname, IFNAMSIZ - 1);
 124
 125         if (iwinfo_ioctl(SIOCGIFFLAGS, &ifr))
 126                 return 0;
 127
 128         ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
 129
 130         return !iwinfo_ioctl(SIOCSIFFLAGS, &ifr);
 131 }
 132
 133 int iwinfo_ifmac(const char *ifname)
 134 {
 135         struct ifreq ifr;
 136
 137         strncpy(ifr.ifr_name, ifname, IFNAMSIZ - 1);
 138
 139         if (iwinfo_ioctl(SIOCGIFHWADDR, &ifr))
 140                 return 0;
 141
 142         ifr.ifr_hwaddr.sa_data[0] |= 0x02;
 143         ifr.ifr_hwaddr.sa_data[1]++;
 144         ifr.ifr_hwaddr.sa_data[2]++;
 145
 146         return !iwinfo_ioctl(SIOCSIFHWADDR, &ifr);
 147 }
 148
 149 void iwinfo_close(void)
 150 {
 151         if (ioctl_socket > -1)
 152                 close(ioctl_socket);
 153
 154         ioctl_socket = -1;
 155 }
 156
 157 struct iwinfo_hardware_entry * iwinfo_hardware(struct iwinfo_hardware_id *id)
 158 {
 159         FILE *db;
 160         char buf[256] = { 0 };
 161         static struct iwinfo_hardware_entry e;
 162         struct iwinfo_hardware_entry *rv = NULL;
 163
 164         if (!(db = fopen(IWINFO_HARDWARE_FILE, "r")))
 165                 return NULL;
 166
 167         while (fgets(buf, sizeof(buf) - 1, db) != NULL)
 168         {
 169                 memset(&e, 0, sizeof(e));
 170
 171                 if (sscanf(buf, "%hx %hx %hx %hx %hd %hd \"%63[^\"]\" \"%63[^\"]\"",
 172                                &e.vendor_id, &e.device_id,
 173                                &e.subsystem_vendor_id, &e.subsystem_device_id,
 174                                &e.txpower_offset, &e.frequency_offset,
 175                                e.vendor_name, e.device_name) < 8)
 176                         continue;
 177
 178                 if ((e.vendor_id != 0xffff) && (e.vendor_id != id->vendor_id))
 179                         continue;
 180
 181                 if ((e.device_id != 0xffff) && (e.device_id != id->device_id))
 182                         continue;
 183
 184                 if ((e.subsystem_vendor_id != 0xffff) &&
 185                         (e.subsystem_vendor_id != id->subsystem_vendor_id))
 186                         continue;
 187
 188                 if ((e.subsystem_device_id != 0xffff) &&
 189                         (e.subsystem_device_id != id->subsystem_device_id))
 190                         continue;
 191
 192                 rv = &e;
 193                 break;
 194         }
 195
 196         fclose(db);
 197         return rv;
 198 }
 199
 200 int iwinfo_hardware_id_from_mtd(struct iwinfo_hardware_id *id)
 201 {
 202         FILE *mtd;
 203         uint16_t *bc;
 204
 205         int fd, off;
 206         unsigned int len;
 207         char buf[128];
 208
 209         if (!(mtd = fopen("/proc/mtd", "r")))
 210                 return -1;
 211
 212         while (fgets(buf, sizeof(buf), mtd) != NULL)
 213         {
 214                 if (fscanf(mtd, "mtd%d: %x %*x %127s", &off, &len, buf) < 3 ||
 215                     (strcmp(buf, "\"boardconfig\"") && strcmp(buf, "\"EEPROM\"") &&
 216                      strcmp(buf, "\"factory\"")))
 217                 {
 218                         off = -1;
 219                         continue;
 220                 }
 221
 222                 break;
 223         }
 224
 225         fclose(mtd);
 226
 227         if (off < 0)
 228                 return -1;
 229
 230         snprintf(buf, sizeof(buf), "/dev/mtdblock%d", off);
 231
 232         if ((fd = open(buf, O_RDONLY)) < 0)
 233                 return -1;
 234
 235         bc = mmap(NULL, len, PROT_READ, MAP_PRIVATE|MAP_LOCKED, fd, 0);
 236
 237         if ((void *)bc != MAP_FAILED)
 238         {
 239                 id->vendor_id = 0;
 240                 id->device_id = 0;
 241
 242                 for (off = len / 2 - 0x800; off >= 0; off -= 0x800)
 243                 {
 244                         /* AR531X board data magic */
 245                         if ((bc[off] == 0x3533) && (bc[off + 1] == 0x3131))
 246                         {
 247                                 id->vendor_id = bc[off + 0x7d];
 248                                 id->device_id = bc[off + 0x7c];
 249                                 id->subsystem_vendor_id = bc[off + 0x84];
 250                                 id->subsystem_device_id = bc[off + 0x83];
 251                                 break;
 252                         }
 253
 254                         /* AR5416 EEPROM magic */
 255                         else if ((bc[off] == 0xA55A) || (bc[off] == 0x5AA5))
 256                         {
 257                                 id->vendor_id = bc[off + 0x0D];
 258                                 id->device_id = bc[off + 0x0E];
 259                                 id->subsystem_vendor_id = bc[off + 0x13];
 260                                 id->subsystem_device_id = bc[off + 0x14];
 261                                 break;
 262                         }
 263
 264                         /* Rt3xxx SoC */
 265                         else if ((bc[off] == 0x3050) || (bc[off] == 0x5030) ||
 266                                  (bc[off] == 0x3051) || (bc[off] == 0x5130) ||
 267                                  (bc[off] == 0x3052) || (bc[off] == 0x5230) ||
 268                                  (bc[off] == 0x3350) || (bc[off] == 0x5033) ||
 269                                  (bc[off] == 0x3352) || (bc[off] == 0x5233) ||
 270                                  (bc[off] == 0x3662) || (bc[off] == 0x6236) ||
 271                                  (bc[off] == 0x3883) || (bc[off] == 0x8338) ||
 272                                  (bc[off] == 0x5350) || (bc[off] == 0x5053))
 273                         {
 274                                 /* vendor: RaLink */
 275                                 id->vendor_id = 0x1814;
 276                                 id->subsystem_vendor_id = 0x1814;
 277
 278                                 /* device */
 279                                 if (((bc[off] & 0xf0) == 0x30) ||
 280                                     ((bc[off] & 0xff) == 0x53))
 281                                         id->device_id = (bc[off] >> 8) | (bc[off] & 0x00ff) << 8;
 282                                 else
 283                                         id->device_id = bc[off];
 284
 285                                 /* subsystem from EEPROM_NIC_CONF0_RF_TYPE */
 286                                 id->subsystem_device_id = (bc[off + 0x1a] & 0x0f00) >> 8;
 287                         } else if ((bc[off] == 0x7620) || (bc[off] == 0x2076) ||
 288                                    (bc[off] == 0x7628) || (bc[off] == 0x2876) ||
 289                                    (bc[off] == 0x7688) || (bc[off] == 0x8876)) {
 290                                 /* vendor: MediaTek */
 291                                 id->vendor_id = 0x14c3;
 292                                 id->subsystem_vendor_id = 0x14c3;
 293
 294                                 /* device */
 295                                 if ((bc[off] & 0xff) == 0x76)
 296                                         id->device_id = (bc[off] >> 8) | (bc[off] & 0x00ff) << 8;
 297                                 else
 298                                         id->device_id = bc[off];
 299
 300                                 /* subsystem from EEPROM_NIC_CONF0_RF_TYPE */
 301                                 id->subsystem_device_id = (bc[off + 0x1a] & 0x0f00) >> 8;
 302                         }
 303                 }
 304
 305                 munmap(bc, len);
 306         }
 307
 308         close(fd);
 309
 310         return (id->vendor_id && id->device_id) ? 0 : -1;
 311 }
 312
 313 static void iwinfo_parse_rsn_cipher(uint8_t idx, uint16_t *ciphers)
 314 {
 315         switch (idx)
 316         {
 317                 case 0:
 318                         *ciphers |= IWINFO_CIPHER_NONE;
 319                         break;
 320
 321                 case 1:
 322                         *ciphers |= IWINFO_CIPHER_WEP40;
 323                         break;
 324
 325                 case 2:
 326                         *ciphers |= IWINFO_CIPHER_TKIP;
 327                         break;
 328
 329                 case 3:  /* WRAP */
 330                         break;
 331
 332                 case 4:
 333                         *ciphers |= IWINFO_CIPHER_CCMP;
 334                         break;
 335
 336                 case 5:
 337                         *ciphers |= IWINFO_CIPHER_WEP104;
 338                         break;
 339
 340                 case 8:
 341                         *ciphers |= IWINFO_CIPHER_GCMP;
 342                         break;
 343
 344                 case 9:
 345                         *ciphers |= IWINFO_CIPHER_GCMP256;
 346                         break;
 347
 348                 case 10:
 349                         *ciphers |= IWINFO_CIPHER_CCMP256;
 350                         break;
 351
 352                 case 6:  /* AES-128-CMAC */
 353                 case 7:  /* No group addressed */
 354                 case 11: /* BIP-GMAC-128 */
 355                 case 12: /* BIP-GMAC-256 */
 356                 case 13: /* BIP-CMAC-256 */
 357                         break;
 358         }
 359 }
 360
 361 void iwinfo_parse_rsn(struct iwinfo_crypto_entry *c, uint8_t *data, uint8_t len,
 362                                           uint16_t defcipher, uint8_t defauth)
 363 {
 364         uint16_t i, count;
 365         uint8_t wpa_version = 0;
 366
 367         static unsigned char ms_oui[3]        = { 0x00, 0x50, 0xf2 };
 368         static unsigned char ieee80211_oui[3] = { 0x00, 0x0f, 0xac };
 369
 370         data += 2;
 371         len -= 2;
 372
 373         if (!memcmp(data, ms_oui, 3))
 374                 wpa_version |= 1;
 375         else if (!memcmp(data, ieee80211_oui, 3))
 376                 wpa_version |= 2;
 377
 378         if (len < 4)
 379         {
 380                 c->group_ciphers |= defcipher;
 381                 c->pair_ciphers  |= defcipher;
 382                 c->auth_suites   |= defauth;
 383                 return;
 384         }
 385
 386         if (!memcmp(data, ms_oui, 3) || !memcmp(data, ieee80211_oui, 3))
 387                 iwinfo_parse_rsn_cipher(data[3], &c->group_ciphers);
 388
 389         data += 4;
 390         len -= 4;
 391
 392         if (len < 2)
 393         {
 394                 c->pair_ciphers |= defcipher;
 395                 c->auth_suites  |= defauth;
 396                 return;
 397         }
 398
 399         count = data[0] | (data[1] << 8);
 400         if (2 + (count * 4) > len)
 401                 return;
 402
 403         for (i = 0; i < count; i++)
 404                 if (!memcmp(data + 2 + (i * 4), ms_oui, 3) ||
 405                     !memcmp(data + 2 + (i * 4), ieee80211_oui, 3))
 406                         iwinfo_parse_rsn_cipher(data[2 + (i * 4) + 3], &c->pair_ciphers);
 407
 408         data += 2 + (count * 4);
 409         len -= 2 + (count * 4);
 410
 411         if (len < 2)
 412         {
 413                 c->auth_suites |= defauth;
 414                 return;
 415         }
 416
 417         count = data[0] | (data[1] << 8);
 418         if (2 + (count * 4) > len)
 419                 return;
 420
 421         for (i = 0; i < count; i++)
 422         {
 423                 if (!memcmp(data + 2 + (i * 4), ms_oui, 3) ||
 424                         !memcmp(data + 2 + (i * 4), ieee80211_oui, 3))
 425                 {
 426                         switch (data[2 + (i * 4) + 3])
 427                         {
 428                                 case 1:  /* IEEE 802.1x */
 429                                         c->wpa_version |= wpa_version;
 430                                         c->auth_suites |= IWINFO_KMGMT_8021x;
 431                                         break;
 432
 433                                 case 2:  /* PSK */
 434                                         c->wpa_version |= wpa_version;
 435                                         c->auth_suites |= IWINFO_KMGMT_PSK;
 436                                         break;
 437
 438                                 case 3:  /* FT/IEEE 802.1X */
 439                                 case 4:  /* FT/PSK */
 440                                 case 5:  /* IEEE 802.1X/SHA-256 */
 441                                 case 6:  /* PSK/SHA-256 */
 442                                 case 7:  /* TPK Handshake */
 443                                         break;
 444
 445                                 case 8:  /* SAE */
 446                                         c->wpa_version |= 4;
 447                                         c->auth_suites |= IWINFO_KMGMT_SAE;
 448                                         break;
 449
 450                                 case 9:  /* FT/SAE */
 451                                 case 10: /* undefined */
 452                                         break;
 453
 454                                 case 11: /* 802.1x Suite-B */
 455                                 case 12: /* 802.1x Suite-B-192 */
 456                                 case 13: /* FT/802.1x SHA-384 */
 457                                         c->wpa_version |= 4;
 458                                         c->auth_suites |= IWINFO_KMGMT_8021x;
 459                                         break;
 460
 461                                 case 14: /* FILS SHA-256 */
 462                                 case 15: /* FILS SHA-384 */
 463                                 case 16: /* FT/FILS SHA-256 */
 464                                 case 17: /* FT/FILS SHA-384 */
 465                                         break;
 466
 467                                 case 18: /* OWE */
 468                                         c->wpa_version |= 4;
 469                                         c->auth_suites |= IWINFO_KMGMT_OWE;
 470                                         break;
 471                         }
 472                 }
 473         }
 474
 475         data += 2 + (count * 4);
 476         len -= 2 + (count * 4);
 477 }
 478
 479 struct uci_section *iwinfo_uci_get_radio(const char *name, const char *type)
 480 {
 481         struct uci_ptr ptr = {
 482                 .package = "wireless",
 483                 .section = name,
 484                 .flags = (name && *name == '@') ? UCI_LOOKUP_EXTENDED : 0,
 485         };
 486         const char *opt;
 487
 488         if (!uci_ctx) {
 489                 uci_ctx = uci_alloc_context();
 490                 if (!uci_ctx)
 491                         return NULL;
 492         }
 493
 494         if (uci_lookup_ptr(uci_ctx, &ptr, NULL, true))
 495                 return NULL;
 496
 497         if (!ptr.s || strcmp(ptr.s->type, "wifi-device") != 0)
 498                 return NULL;
 499
 500         opt = uci_lookup_option_string(uci_ctx, ptr.s, "type");
 501         if (!opt || strcmp(opt, type) != 0)
 502                 return NULL;
 503
 504         return ptr.s;
 505 }
 506
 507 void iwinfo_uci_free(void)
 508 {
 509         if (!uci_ctx)
 510                 return;
 511
 512         uci_free_context(uci_ctx);
 513         uci_ctx = NULL;
 514 }
 515
 516
 517 struct iwinfo_ubus_query_state {
 518         const char *ifname;
 519         const char *field;
 520         size_t len;
 521         char *buf;
 522 };
 523
 524 static void iwinfo_ubus_query_cb(struct ubus_request *req, int type,
 525                                  struct blob_attr *msg)
 526 {
 527         struct iwinfo_ubus_query_state *st = req->priv;
 528
 529         struct blobmsg_policy pol1[2] = {
 530                 { "ifname",  BLOBMSG_TYPE_STRING },
 531                 { "config",  BLOBMSG_TYPE_TABLE }
 532         };
 533
 534         struct blobmsg_policy pol2 = { st->field, BLOBMSG_TYPE_STRING };
 535         struct blob_attr *cur, *cur2, *cur3, *cfg[2], *res;
 536         int rem, rem2, rem3;
 537
 538         blobmsg_for_each_attr(cur, msg, rem) {
 539                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE)
 540                         continue;
 541
 542                 blobmsg_for_each_attr(cur2, cur, rem2) {
 543                         if (blobmsg_type(cur2) != BLOBMSG_TYPE_ARRAY)
 544                                 continue;
 545
 546                         if (strcmp(blobmsg_name(cur2), "interfaces"))
 547                                 continue;
 548
 549                         blobmsg_for_each_attr(cur3, cur2, rem3) {
 550                                 blobmsg_parse(pol1, sizeof(pol1) / sizeof(pol1[0]), cfg,
 551                                               blobmsg_data(cur3), blobmsg_len(cur3));
 552
 553                                 if (!cfg[0] || !cfg[1] ||
 554                                     strcmp(blobmsg_get_string(cfg[0]), st->ifname))
 555                                         continue;
 556
 557                                 blobmsg_parse(&pol2, 1, &res,
 558                                               blobmsg_data(cfg[1]), blobmsg_len(cfg[1]));
 559
 560                                 if (!res)
 561                                         continue;
 562
 563                                 strncpy(st->buf, blobmsg_get_string(res), st->len);
 564                                 return;
 565                         }
 566                 }
 567         }
 568 }
 569
 570 int iwinfo_ubus_query(const char *ifname, const char *field,
 571                       char *buf, size_t len)
 572 {
 573         struct iwinfo_ubus_query_state st = {
 574                 .ifname = ifname,
 575                 .field = field,
 576                 .buf = buf,
 577                 .len = len
 578         };
 579
 580         struct ubus_context *ctx = NULL;
 581         struct blob_buf b = { };
 582         int rv = -1;
 583         uint32_t id;
 584
 585         blob_buf_init(&b, 0);
 586
 587         ctx = ubus_connect(NULL);
 588
 589         if (!ctx)
 590                 goto out;
 591
 592         if (ubus_lookup_id(ctx, "network.wireless", &id))
 593                 goto out;
 594
 595         if (ubus_invoke(ctx, id, "status", b.head, iwinfo_ubus_query_cb, &st, 250))
 596                 goto out;
 597
 598         rv = 0;
 599
 600 out:
 601         if (ctx)
 602                 ubus_free(ctx);
 603
 604         blob_buf_free(&b);
 605
 606         return rv;
 607 }