event.c

   1 #include <stdint.h>
   2 #include <stdbool.h>
   3 #include <net/if.h>
   4 #include <errno.h>
   5 #include "iw.h"
   6
   7 static int no_seq_check(struct nl_msg *msg, void *arg)
   8 {
   9         return NL_OK;
  10 }
  11
  12 struct ieee80211_beacon_channel {
  13         __u16 center_freq;
  14         bool passive_scan;
  15         bool no_ibss;
  16 };
  17
  18 static int parse_beacon_hint_chan(struct nlattr *tb,
  19                                   struct ieee80211_beacon_channel *chan)
  20 {
  21         struct nlattr *tb_freq[NL80211_FREQUENCY_ATTR_MAX + 1];
  22         static struct nla_policy beacon_freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
  23                 [NL80211_FREQUENCY_ATTR_FREQ] = { .type = NLA_U32 },
  24                 [NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
  25                 [NL80211_FREQUENCY_ATTR_NO_IBSS] = { .type = NLA_FLAG },
  26         };
  27
  28         if (nla_parse_nested(tb_freq,
  29                              NL80211_FREQUENCY_ATTR_MAX,
  30                              tb,
  31                              beacon_freq_policy))
  32                 return -EINVAL;
  33
  34         chan->center_freq = nla_get_u32(tb_freq[NL80211_FREQUENCY_ATTR_FREQ]);
  35
  36         if (tb_freq[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN])
  37                 chan->passive_scan = true;
  38         if (tb_freq[NL80211_FREQUENCY_ATTR_NO_IBSS])
  39                 chan->no_ibss = true;
  40
  41         return 0;
  42 }
  43
  44 static void print_frame(struct print_event_args *args, struct nlattr *attr)
  45 {
  46         uint8_t *frame;
  47         size_t len;
  48         int i;
  49         char macbuf[6*3];
  50         uint16_t tmp;
  51
  52         if (!attr)
  53                 printf(" [no frame]");
  54
  55         frame = nla_data(attr);
  56         len = nla_len(attr);
  57
  58         if (len < 26) {
  59                 printf(" [invalid frame: ");
  60                 goto print_frame;
  61         }
  62
  63         mac_addr_n2a(macbuf, frame + 10);
  64         printf(" %s -> ", macbuf);
  65         mac_addr_n2a(macbuf, frame + 4);
  66         printf("%s", macbuf);
  67
  68         switch (frame[0] & 0xfc) {
  69         case 0x10: /* assoc resp */
  70         case 0x30: /* reassoc resp */
  71                 /* status */
  72                 tmp = (frame[27] << 8) + frame[26];
  73                 printf(" status: %d: %s", tmp, get_status_str(tmp));
  74                 break;
  75         case 0x00: /* assoc req */
  76         case 0x20: /* reassoc req */
  77                 break;
  78         case 0xb0: /* auth */
  79                 /* status */
  80                 tmp = (frame[29] << 8) + frame[28];
  81                 printf(" status: %d: %s", tmp, get_status_str(tmp));
  82                 break;
  83                 break;
  84         case 0xa0: /* disassoc */
  85         case 0xc0: /* deauth */
  86                 /* reason */
  87                 tmp = (frame[25] << 8) + frame[24];
  88                 printf(" reason %d: %s", tmp, get_reason_str(tmp));
  89                 break;
  90         }
  91
  92         if (!args->frame)
  93                 return;
  94
  95         printf(" [frame:");
  96
  97  print_frame:
  98         for (i = 0; i < len; i++)
  99                 printf(" %.02x", frame[i]);
 100         printf("]");
 101 }
 102
 103 static void parse_cqm_event(struct nlattr *tb)
 104 {
 105         static struct nla_policy cqm_policy[NL80211_ATTR_CQM_MAX + 1] = {
 106                 [NL80211_ATTR_CQM_RSSI_THOLD] = { .type = NLA_U32 },
 107                 [NL80211_ATTR_CQM_RSSI_HYST] = { .type = NLA_U32 },
 108                 [NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT] = { .type = NLA_U32 },
 109         };
 110         struct nlattr *cqm[NL80211_ATTR_CQM_MAX + 1];
 111
 112         printf("connection quality monitor event: ");
 113
 114         if (!tb || nla_parse_nested(cqm, NL80211_ATTR_CQM_MAX, tb, cqm_policy)) {
 115                 printf("missing data!\n");
 116                 return;
 117         }
 118
 119         if (cqm[NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT]) {
 120                 enum nl80211_cqm_rssi_threshold_event rssi_event;
 121                 rssi_event = nla_get_u32(cqm[NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT]);
 122                 if (rssi_event == NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH)
 123                         printf("RSSI went above threshold");
 124                 else
 125                         printf("RSSI went below threshold");
 126         }
 127         printf("\n");
 128 }
 129
 130
 131 static int print_event(struct nl_msg *msg, void *arg)
 132 {
 133 #define PARSE_BEACON_CHAN(_attr, _chan) do { \
 134         r = parse_beacon_hint_chan(tb[_attr], \
 135                                    &_chan); \
 136         if (r) \
 137                 return NL_SKIP; \
 138 } while (0)
 139         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 140         struct nlattr *tb[NL80211_ATTR_MAX + 1], *nst;
 141         struct print_event_args *args = arg;
 142         char ifname[100];
 143         char macbuf[6*3];
 144         __u8 reg_type;
 145         struct ieee80211_beacon_channel chan_before_beacon,  chan_after_beacon;
 146         __u32 wiphy_idx = 0;
 147         int r;
 148         int rem_nst;
 149         __u16 status;
 150
 151         if (args->time) {
 152                 struct timeval tv;
 153                 gettimeofday(&tv, NULL);
 154                 printf("%ld.%06u: ", (long) tv.tv_sec, (unsigned int) tv.tv_usec);
 155         }
 156
 157         nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 158                   genlmsg_attrlen(gnlh, 0), NULL);
 159
 160         if (tb[NL80211_ATTR_IFINDEX] && tb[NL80211_ATTR_WIPHY]) {
 161                 if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), ifname);
 162                 printf("%s (phy #%d): ", ifname, nla_get_u32(tb[NL80211_ATTR_WIPHY]));
 163         } else if (tb[NL80211_ATTR_IFINDEX]) {
 164                 if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), ifname);
 165                 printf("%s: ", ifname);
 166         } else if (tb[NL80211_ATTR_WIPHY]) {
 167                 printf("phy #%d: ", nla_get_u32(tb[NL80211_ATTR_WIPHY]));
 168         }
 169
 170         switch (gnlh->cmd) {
 171         case NL80211_CMD_NEW_WIPHY:
 172                 printf("renamed to %s\n", nla_get_string(tb[NL80211_ATTR_WIPHY_NAME]));
 173                 break;
 174         case NL80211_CMD_TRIGGER_SCAN:
 175                 printf("scan started\n");
 176                 break;
 177         case NL80211_CMD_NEW_SCAN_RESULTS:
 178                 printf("scan finished:");
 179         case NL80211_CMD_SCAN_ABORTED:
 180                 if (gnlh->cmd == NL80211_CMD_SCAN_ABORTED)
 181                         printf("scan aborted:");
 182                 if (tb[NL80211_ATTR_SCAN_FREQUENCIES]) {
 183                         nla_for_each_nested(nst, tb[NL80211_ATTR_SCAN_FREQUENCIES], rem_nst)
 184                                 printf(" %d", nla_get_u32(nst));
 185                         printf(",");
 186                 }
 187                 if (tb[NL80211_ATTR_SCAN_SSIDS]) {
 188                         nla_for_each_nested(nst, tb[NL80211_ATTR_SCAN_SSIDS], rem_nst) {
 189                                 printf(" \"");
 190                                 print_ssid_escaped(nla_len(nst), nla_data(nst));
 191                                 printf("\"");
 192                         }
 193                 }
 194                 printf("\n");
 195                 break;
 196         case NL80211_CMD_REG_CHANGE:
 197                 printf("regulatory domain change: ");
 198
 199                 reg_type = nla_get_u8(tb[NL80211_ATTR_REG_TYPE]);
 200
 201                 switch (reg_type) {
 202                 case NL80211_REGDOM_TYPE_COUNTRY:
 203                         printf("set to %s by %s request",
 204                                nla_get_string(tb[NL80211_ATTR_REG_ALPHA2]),
 205                                reg_initiator_to_string(nla_get_u8(tb[NL80211_ATTR_REG_INITIATOR])));
 206                         if (tb[NL80211_ATTR_WIPHY])
 207                                 printf(" on phy%d", nla_get_u32(tb[NL80211_ATTR_WIPHY]));
 208                         break;
 209                 case NL80211_REGDOM_TYPE_WORLD:
 210                         printf("set to world roaming by %s request",
 211                                reg_initiator_to_string(nla_get_u8(tb[NL80211_ATTR_REG_INITIATOR])));
 212                         break;
 213                 case NL80211_REGDOM_TYPE_CUSTOM_WORLD:
 214                         printf("custom world roaming rules in place on phy%d by %s request",
 215                                nla_get_u32(tb[NL80211_ATTR_WIPHY]),
 216                                reg_initiator_to_string(nla_get_u32(tb[NL80211_ATTR_REG_INITIATOR])));
 217                         break;
 218                 case NL80211_REGDOM_TYPE_INTERSECTION:
 219                         printf("intersection used due to a request made by %s",
 220                                reg_initiator_to_string(nla_get_u32(tb[NL80211_ATTR_REG_INITIATOR])));
 221                         if (tb[NL80211_ATTR_WIPHY])
 222                                 printf(" on phy%d", nla_get_u32(tb[NL80211_ATTR_WIPHY]));
 223                         break;
 224                 default:
 225                         printf("unknown source (upgrade this utility)");
 226                         break;
 227                 }
 228
 229                 printf("\n");
 230                 break;
 231         case NL80211_CMD_REG_BEACON_HINT:
 232
 233                 wiphy_idx = nla_get_u32(tb[NL80211_ATTR_WIPHY]);
 234
 235                 memset(&chan_before_beacon, 0, sizeof(chan_before_beacon));
 236                 memset(&chan_after_beacon, 0, sizeof(chan_after_beacon));
 237
 238                 PARSE_BEACON_CHAN(NL80211_ATTR_FREQ_BEFORE, chan_before_beacon);
 239                 PARSE_BEACON_CHAN(NL80211_ATTR_FREQ_AFTER, chan_after_beacon);
 240
 241                 if (chan_before_beacon.center_freq != chan_after_beacon.center_freq)
 242                         break;
 243
 244                 /* A beacon hint is sent _only_ if something _did_ change */
 245                 printf("beacon hint:\n");
 246
 247                 printf("phy%d %d MHz [%d]:\n",
 248                        wiphy_idx,
 249                        chan_before_beacon.center_freq,
 250                        ieee80211_frequency_to_channel(chan_before_beacon.center_freq));
 251
 252                 if (chan_before_beacon.passive_scan && !chan_after_beacon.passive_scan)
 253                         printf("\to active scanning enabled\n");
 254                 if (chan_before_beacon.no_ibss && !chan_after_beacon.no_ibss)
 255                         printf("\to beaconing enabled\n");
 256
 257                 break;
 258         case NL80211_CMD_NEW_STATION:
 259                 mac_addr_n2a(macbuf, nla_data(tb[NL80211_ATTR_MAC]));
 260                 printf("new station %s\n", macbuf);
 261                 break;
 262         case NL80211_CMD_JOIN_IBSS:
 263                 mac_addr_n2a(macbuf, nla_data(tb[NL80211_ATTR_MAC]));
 264                 printf("IBSS %s joined\n", macbuf);
 265                 break;
 266         case NL80211_CMD_AUTHENTICATE:
 267                 printf("auth");
 268                 if (tb[NL80211_ATTR_FRAME])
 269                         print_frame(args, tb[NL80211_ATTR_FRAME]);
 270                 else if (tb[NL80211_ATTR_TIMED_OUT])
 271                         printf(": timed out");
 272                 else
 273                         printf(": unknown event");
 274                 printf("\n");
 275                 break;
 276         case NL80211_CMD_ASSOCIATE:
 277                 printf("assoc");
 278                 if (tb[NL80211_ATTR_FRAME])
 279                         print_frame(args, tb[NL80211_ATTR_FRAME]);
 280                 else if (tb[NL80211_ATTR_TIMED_OUT])
 281                         printf(": timed out");
 282                 else
 283                         printf(": unknown event");
 284                 printf("\n");
 285                 break;
 286         case NL80211_CMD_DEAUTHENTICATE:
 287                 printf("deauth");
 288                 print_frame(args, tb[NL80211_ATTR_FRAME]);
 289                 printf("\n");
 290                 break;
 291         case NL80211_CMD_DISASSOCIATE:
 292                 printf("disassoc");
 293                 print_frame(args, tb[NL80211_ATTR_FRAME]);
 294                 printf("\n");
 295                 break;
 296         case NL80211_CMD_CONNECT:
 297                 status = 0;
 298                 if (!tb[NL80211_ATTR_STATUS_CODE])
 299                         printf("unknown connect status");
 300                 else if (nla_get_u16(tb[NL80211_ATTR_STATUS_CODE]) == 0)
 301                         printf("connected");
 302                 else {
 303                         status = nla_get_u16(tb[NL80211_ATTR_STATUS_CODE]);
 304                         printf("failed to connect");
 305                 }
 306                 if (tb[NL80211_ATTR_MAC]) {
 307                         mac_addr_n2a(macbuf, nla_data(tb[NL80211_ATTR_MAC]));
 308                         printf(" to %s", macbuf);
 309                 }
 310                 if (status)
 311                         printf(", status: %d: %s", status, get_status_str(status));
 312                 printf("\n");
 313                 break;
 314         case NL80211_CMD_ROAM:
 315                 printf("roamed");
 316                 if (tb[NL80211_ATTR_MAC]) {
 317                         mac_addr_n2a(macbuf, nla_data(tb[NL80211_ATTR_MAC]));
 318                         printf(" to %s", macbuf);
 319                 }
 320                 printf("\n");
 321                 break;
 322         case NL80211_CMD_DISCONNECT:
 323                 printf("disconnected");
 324                 if (tb[NL80211_ATTR_DISCONNECTED_BY_AP])
 325                         printf(" (by AP)");
 326                 else
 327                         printf(" (local request)");
 328                 if (tb[NL80211_ATTR_REASON_CODE])
 329                         printf(" reason: %d: %s", nla_get_u16(tb[NL80211_ATTR_REASON_CODE]),
 330                                 get_reason_str(nla_get_u16(tb[NL80211_ATTR_REASON_CODE])));
 331                 printf("\n");
 332                 break;
 333         case NL80211_CMD_REMAIN_ON_CHANNEL:
 334                 printf("remain on freq %d (%dms, cookie %llx)\n",
 335                         nla_get_u32(tb[NL80211_ATTR_WIPHY_FREQ]),
 336                         nla_get_u32(tb[NL80211_ATTR_DURATION]),
 337                         (unsigned long long)nla_get_u64(tb[NL80211_ATTR_COOKIE]));
 338                 break;
 339         case NL80211_CMD_CANCEL_REMAIN_ON_CHANNEL:
 340                 printf("done with remain on freq %d (cookie %llx)\n",
 341                         nla_get_u32(tb[NL80211_ATTR_WIPHY_FREQ]),
 342                         (unsigned long long)nla_get_u64(tb[NL80211_ATTR_COOKIE]));
 343                 break;
 344         case NL80211_CMD_NOTIFY_CQM:
 345                 parse_cqm_event(tb[NL80211_ATTR_CQM]);
 346                 break;
 347         default:
 348                 printf("unknown event %d\n", gnlh->cmd);
 349                 break;
 350         }
 351
 352         fflush(stdout);
 353         return NL_SKIP;
 354 #undef PARSE_BEACON_CHAN
 355 }
 356
 357 struct wait_event {
 358         int n_cmds;
 359         const __u32 *cmds;
 360         __u32 cmd;
 361         struct print_event_args *pargs;
 362 };
 363
 364 static int wait_event(struct nl_msg *msg, void *arg)
 365 {
 366         struct wait_event *wait = arg;
 367         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 368         int i;
 369
 370         for (i = 0; i < wait->n_cmds; i++) {
 371                 if (gnlh->cmd == wait->cmds[i]) {
 372                         wait->cmd = gnlh->cmd;
 373                 if (wait->pargs)
 374                         print_event(msg, wait->pargs);
 375                 }
 376         }
 377
 378         return NL_SKIP;
 379 }
 380
 381 int __prepare_listen_events(struct nl80211_state *state)
 382 {
 383         int mcid, ret;
 384
 385         /* Configuration multicast group */
 386         mcid = nl_get_multicast_id(state->nl_sock, "nl80211", "config");
 387         if (mcid < 0)
 388                 return mcid;
 389
 390         ret = nl_socket_add_membership(state->nl_sock, mcid);
 391         if (ret)
 392                 return ret;
 393
 394         /* Scan multicast group */
 395         mcid = nl_get_multicast_id(state->nl_sock, "nl80211", "scan");
 396         if (mcid >= 0) {
 397                 ret = nl_socket_add_membership(state->nl_sock, mcid);
 398                 if (ret)
 399                         return ret;
 400         }
 401
 402         /* Regulatory multicast group */
 403         mcid = nl_get_multicast_id(state->nl_sock, "nl80211", "regulatory");
 404         if (mcid >= 0) {
 405                 ret = nl_socket_add_membership(state->nl_sock, mcid);
 406                 if (ret)
 407                         return ret;
 408         }
 409
 410         /* MLME multicast group */
 411         mcid = nl_get_multicast_id(state->nl_sock, "nl80211", "mlme");
 412         if (mcid >= 0) {
 413                 ret = nl_socket_add_membership(state->nl_sock, mcid);
 414                 if (ret)
 415                         return ret;
 416         }
 417
 418         return 0;
 419 }
 420
 421 __u32 __do_listen_events(struct nl80211_state *state,
 422                          const int n_waits, const __u32 *waits,
 423                          struct print_event_args *args)
 424 {
 425         struct nl_cb *cb = nl_cb_alloc(iw_debug ? NL_CB_DEBUG : NL_CB_DEFAULT);
 426         struct wait_event wait_ev;
 427
 428         if (!cb) {
 429                 fprintf(stderr, "failed to allocate netlink callbacks\n");
 430                 return -ENOMEM;
 431         }
 432
 433         /* no sequence checking for multicast messages */
 434         nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, no_seq_check, NULL);
 435
 436         if (n_waits && waits) {
 437                 wait_ev.cmds = waits;
 438                 wait_ev.n_cmds = n_waits;
 439                 wait_ev.pargs = args;
 440                 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, wait_event, &wait_ev);
 441         } else
 442                 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_event, args);
 443
 444         wait_ev.cmd = 0;
 445
 446         while (!wait_ev.cmd)
 447                 nl_recvmsgs(state->nl_sock, cb);
 448
 449         nl_cb_put(cb);
 450
 451         return wait_ev.cmd;
 452 }
 453
 454 __u32 listen_events(struct nl80211_state *state,
 455                     const int n_waits, const __u32 *waits)
 456 {
 457         int ret;
 458
 459         ret = __prepare_listen_events(state);
 460         if (ret)
 461                 return ret;
 462
 463         return __do_listen_events(state, n_waits, waits, NULL);
 464 }
 465
 466 static int print_events(struct nl80211_state *state,
 467                         struct nl_cb *cb,
 468                         struct nl_msg *msg,
 469                         int argc, char **argv)
 470 {
 471         struct print_event_args args;
 472         int ret;
 473
 474         memset(&args, 0, sizeof(args));
 475
 476         argc--;
 477         argv++;
 478
 479         while (argc > 0) {
 480                 if (strcmp(argv[0], "-f") == 0)
 481                         args.frame = true;
 482                 else if (strcmp(argv[0], "-t") == 0)
 483                         args.time = true;
 484                 else
 485                         return 1;
 486                 argc--;
 487                 argv++;
 488         }
 489
 490         if (argc)
 491                 return 1;
 492
 493         ret = __prepare_listen_events(state);
 494         if (ret)
 495                 return ret;
 496
 497         return __do_listen_events(state, 0, NULL, &args);
 498 }
 499 TOPLEVEL(event, "[-t] [-f]", 0, 0, CIB_NONE, print_events,
 500         "Monitor events from the kernel.\n"
 501         "-t - print timestamp\n"
 502         "-f - print full frame for auth/assoc etc.");