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         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 134         struct nlattr *tb[NL80211_ATTR_MAX + 1], *nst;
 135         struct print_event_args *args = arg;
 136         char ifname[100];
 137         char macbuf[6*3];
 138         __u8 reg_type;
 139         struct ieee80211_beacon_channel chan_before_beacon,  chan_after_beacon;
 140         __u32 wiphy_idx = 0;
 141         int rem_nst;
 142         __u16 status;
 143
 144         if (args->time || args->reltime) {
 145                 unsigned long long usecs, previous;
 146
 147                 previous = 1000000ULL * args->ts.tv_sec + args->ts.tv_usec;
 148                 gettimeofday(&args->ts, NULL);
 149                 usecs = 1000000ULL * args->ts.tv_sec + args->ts.tv_usec;
 150                 if (args->reltime) {
 151                         if (!args->have_ts) {
 152                                 usecs = 0;
 153                                 args->have_ts = true;
 154                         } else
 155                                 usecs -= previous;
 156                 }
 157                 printf("%llu.%06llu: ", usecs/1000000, usecs % 1000000);
 158         }
 159
 160         nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 161                   genlmsg_attrlen(gnlh, 0), NULL);
 162
 163         if (tb[NL80211_ATTR_IFINDEX] && tb[NL80211_ATTR_WIPHY]) {
 164                 if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), ifname);
 165                 printf("%s (phy #%d): ", ifname, nla_get_u32(tb[NL80211_ATTR_WIPHY]));
 166         } else if (tb[NL80211_ATTR_IFINDEX]) {
 167                 if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), ifname);
 168                 printf("%s: ", ifname);
 169         } else if (tb[NL80211_ATTR_WIPHY]) {
 170                 printf("phy #%d: ", nla_get_u32(tb[NL80211_ATTR_WIPHY]));
 171         }
 172
 173         switch (gnlh->cmd) {
 174         case NL80211_CMD_NEW_WIPHY:
 175                 printf("renamed to %s\n", nla_get_string(tb[NL80211_ATTR_WIPHY_NAME]));
 176                 break;
 177         case NL80211_CMD_TRIGGER_SCAN:
 178                 printf("scan started\n");
 179                 break;
 180         case NL80211_CMD_NEW_SCAN_RESULTS:
 181                 printf("scan finished:");
 182         case NL80211_CMD_SCAN_ABORTED:
 183                 if (gnlh->cmd == NL80211_CMD_SCAN_ABORTED)
 184                         printf("scan aborted:");
 185                 if (tb[NL80211_ATTR_SCAN_FREQUENCIES]) {
 186                         nla_for_each_nested(nst, tb[NL80211_ATTR_SCAN_FREQUENCIES], rem_nst)
 187                                 printf(" %d", nla_get_u32(nst));
 188                         printf(",");
 189                 }
 190                 if (tb[NL80211_ATTR_SCAN_SSIDS]) {
 191                         nla_for_each_nested(nst, tb[NL80211_ATTR_SCAN_SSIDS], rem_nst) {
 192                                 printf(" \"");
 193                                 print_ssid_escaped(nla_len(nst), nla_data(nst));
 194                                 printf("\"");
 195                         }
 196                 }
 197                 printf("\n");
 198                 break;
 199         case NL80211_CMD_REG_CHANGE:
 200                 printf("regulatory domain change: ");
 201
 202                 reg_type = nla_get_u8(tb[NL80211_ATTR_REG_TYPE]);
 203
 204                 switch (reg_type) {
 205                 case NL80211_REGDOM_TYPE_COUNTRY:
 206                         printf("set to %s by %s request",
 207                                nla_get_string(tb[NL80211_ATTR_REG_ALPHA2]),
 208                                reg_initiator_to_string(nla_get_u8(tb[NL80211_ATTR_REG_INITIATOR])));
 209                         if (tb[NL80211_ATTR_WIPHY])
 210                                 printf(" on phy%d", nla_get_u32(tb[NL80211_ATTR_WIPHY]));
 211                         break;
 212                 case NL80211_REGDOM_TYPE_WORLD:
 213                         printf("set to world roaming by %s request",
 214                                reg_initiator_to_string(nla_get_u8(tb[NL80211_ATTR_REG_INITIATOR])));
 215                         break;
 216                 case NL80211_REGDOM_TYPE_CUSTOM_WORLD:
 217                         printf("custom world roaming rules in place on phy%d by %s request",
 218                                nla_get_u32(tb[NL80211_ATTR_WIPHY]),
 219                                reg_initiator_to_string(nla_get_u32(tb[NL80211_ATTR_REG_INITIATOR])));
 220                         break;
 221                 case NL80211_REGDOM_TYPE_INTERSECTION:
 222                         printf("intersection used due to a request made by %s",
 223                                reg_initiator_to_string(nla_get_u32(tb[NL80211_ATTR_REG_INITIATOR])));
 224                         if (tb[NL80211_ATTR_WIPHY])
 225                                 printf(" on phy%d", nla_get_u32(tb[NL80211_ATTR_WIPHY]));
 226                         break;
 227                 default:
 228                         printf("unknown source (upgrade this utility)");
 229                         break;
 230                 }
 231
 232                 printf("\n");
 233                 break;
 234         case NL80211_CMD_REG_BEACON_HINT:
 235
 236                 wiphy_idx = nla_get_u32(tb[NL80211_ATTR_WIPHY]);
 237
 238                 memset(&chan_before_beacon, 0, sizeof(chan_before_beacon));
 239                 memset(&chan_after_beacon, 0, sizeof(chan_after_beacon));
 240
 241                 if (parse_beacon_hint_chan(tb[NL80211_ATTR_FREQ_BEFORE],
 242                                            &chan_before_beacon))
 243                         break;
 244                 if (parse_beacon_hint_chan(tb[NL80211_ATTR_FREQ_AFTER],
 245                                            &chan_after_beacon))
 246                         break;
 247
 248                 if (chan_before_beacon.center_freq != chan_after_beacon.center_freq)
 249                         break;
 250
 251                 /* A beacon hint is sent _only_ if something _did_ change */
 252                 printf("beacon hint:\n");
 253
 254                 printf("phy%d %d MHz [%d]:\n",
 255                        wiphy_idx,
 256                        chan_before_beacon.center_freq,
 257                        ieee80211_frequency_to_channel(chan_before_beacon.center_freq));
 258
 259                 if (chan_before_beacon.passive_scan && !chan_after_beacon.passive_scan)
 260                         printf("\to active scanning enabled\n");
 261                 if (chan_before_beacon.no_ibss && !chan_after_beacon.no_ibss)
 262                         printf("\to beaconing enabled\n");
 263
 264                 break;
 265         case NL80211_CMD_NEW_STATION:
 266                 mac_addr_n2a(macbuf, nla_data(tb[NL80211_ATTR_MAC]));
 267                 printf("new station %s\n", macbuf);
 268                 break;
 269         case NL80211_CMD_JOIN_IBSS:
 270                 mac_addr_n2a(macbuf, nla_data(tb[NL80211_ATTR_MAC]));
 271                 printf("IBSS %s joined\n", macbuf);
 272                 break;
 273         case NL80211_CMD_AUTHENTICATE:
 274                 printf("auth");
 275                 if (tb[NL80211_ATTR_FRAME])
 276                         print_frame(args, tb[NL80211_ATTR_FRAME]);
 277                 else if (tb[NL80211_ATTR_TIMED_OUT])
 278                         printf(": timed out");
 279                 else
 280                         printf(": unknown event");
 281                 printf("\n");
 282                 break;
 283         case NL80211_CMD_ASSOCIATE:
 284                 printf("assoc");
 285                 if (tb[NL80211_ATTR_FRAME])
 286                         print_frame(args, tb[NL80211_ATTR_FRAME]);
 287                 else if (tb[NL80211_ATTR_TIMED_OUT])
 288                         printf(": timed out");
 289                 else
 290                         printf(": unknown event");
 291                 printf("\n");
 292                 break;
 293         case NL80211_CMD_DEAUTHENTICATE:
 294                 printf("deauth");
 295                 print_frame(args, tb[NL80211_ATTR_FRAME]);
 296                 printf("\n");
 297                 break;
 298         case NL80211_CMD_DISASSOCIATE:
 299                 printf("disassoc");
 300                 print_frame(args, tb[NL80211_ATTR_FRAME]);
 301                 printf("\n");
 302                 break;
 303         case NL80211_CMD_CONNECT:
 304                 status = 0;
 305                 if (!tb[NL80211_ATTR_STATUS_CODE])
 306                         printf("unknown connect status");
 307                 else if (nla_get_u16(tb[NL80211_ATTR_STATUS_CODE]) == 0)
 308                         printf("connected");
 309                 else {
 310                         status = nla_get_u16(tb[NL80211_ATTR_STATUS_CODE]);
 311                         printf("failed to connect");
 312                 }
 313                 if (tb[NL80211_ATTR_MAC]) {
 314                         mac_addr_n2a(macbuf, nla_data(tb[NL80211_ATTR_MAC]));
 315                         printf(" to %s", macbuf);
 316                 }
 317                 if (status)
 318                         printf(", status: %d: %s", status, get_status_str(status));
 319                 printf("\n");
 320                 break;
 321         case NL80211_CMD_ROAM:
 322                 printf("roamed");
 323                 if (tb[NL80211_ATTR_MAC]) {
 324                         mac_addr_n2a(macbuf, nla_data(tb[NL80211_ATTR_MAC]));
 325                         printf(" to %s", macbuf);
 326                 }
 327                 printf("\n");
 328                 break;
 329         case NL80211_CMD_DISCONNECT:
 330                 printf("disconnected");
 331                 if (tb[NL80211_ATTR_DISCONNECTED_BY_AP])
 332                         printf(" (by AP)");
 333                 else
 334                         printf(" (local request)");
 335                 if (tb[NL80211_ATTR_REASON_CODE])
 336                         printf(" reason: %d: %s", nla_get_u16(tb[NL80211_ATTR_REASON_CODE]),
 337                                 get_reason_str(nla_get_u16(tb[NL80211_ATTR_REASON_CODE])));
 338                 printf("\n");
 339                 break;
 340         case NL80211_CMD_REMAIN_ON_CHANNEL:
 341                 printf("remain on freq %d (%dms, cookie %llx)\n",
 342                         nla_get_u32(tb[NL80211_ATTR_WIPHY_FREQ]),
 343                         nla_get_u32(tb[NL80211_ATTR_DURATION]),
 344                         (unsigned long long)nla_get_u64(tb[NL80211_ATTR_COOKIE]));
 345                 break;
 346         case NL80211_CMD_CANCEL_REMAIN_ON_CHANNEL:
 347                 printf("done with remain on freq %d (cookie %llx)\n",
 348                         nla_get_u32(tb[NL80211_ATTR_WIPHY_FREQ]),
 349                         (unsigned long long)nla_get_u64(tb[NL80211_ATTR_COOKIE]));
 350                 break;
 351         case NL80211_CMD_NOTIFY_CQM:
 352                 parse_cqm_event(tb[NL80211_ATTR_CQM]);
 353                 break;
 354         default:
 355                 printf("unknown event %d\n", gnlh->cmd);
 356                 break;
 357         }
 358
 359         fflush(stdout);
 360         return NL_SKIP;
 361 }
 362
 363 struct wait_event {
 364         int n_cmds;
 365         const __u32 *cmds;
 366         __u32 cmd;
 367         struct print_event_args *pargs;
 368 };
 369
 370 static int wait_event(struct nl_msg *msg, void *arg)
 371 {
 372         struct wait_event *wait = arg;
 373         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 374         int i;
 375
 376         for (i = 0; i < wait->n_cmds; i++) {
 377                 if (gnlh->cmd == wait->cmds[i]) {
 378                         wait->cmd = gnlh->cmd;
 379                         if (wait->pargs)
 380                                 print_event(msg, wait->pargs);
 381                 }
 382         }
 383
 384         return NL_SKIP;
 385 }
 386
 387 int __prepare_listen_events(struct nl80211_state *state)
 388 {
 389         int mcid, ret;
 390
 391         /* Configuration multicast group */
 392         mcid = nl_get_multicast_id(state->nl_sock, "nl80211", "config");
 393         if (mcid < 0)
 394                 return mcid;
 395
 396         ret = nl_socket_add_membership(state->nl_sock, mcid);
 397         if (ret)
 398                 return ret;
 399
 400         /* Scan multicast group */
 401         mcid = nl_get_multicast_id(state->nl_sock, "nl80211", "scan");
 402         if (mcid >= 0) {
 403                 ret = nl_socket_add_membership(state->nl_sock, mcid);
 404                 if (ret)
 405                         return ret;
 406         }
 407
 408         /* Regulatory multicast group */
 409         mcid = nl_get_multicast_id(state->nl_sock, "nl80211", "regulatory");
 410         if (mcid >= 0) {
 411                 ret = nl_socket_add_membership(state->nl_sock, mcid);
 412                 if (ret)
 413                         return ret;
 414         }
 415
 416         /* MLME multicast group */
 417         mcid = nl_get_multicast_id(state->nl_sock, "nl80211", "mlme");
 418         if (mcid >= 0) {
 419                 ret = nl_socket_add_membership(state->nl_sock, mcid);
 420                 if (ret)
 421                         return ret;
 422         }
 423
 424         return 0;
 425 }
 426
 427 __u32 __do_listen_events(struct nl80211_state *state,
 428                          const int n_waits, const __u32 *waits,
 429                          struct print_event_args *args)
 430 {
 431         struct nl_cb *cb = nl_cb_alloc(iw_debug ? NL_CB_DEBUG : NL_CB_DEFAULT);
 432         struct wait_event wait_ev;
 433
 434         if (!cb) {
 435                 fprintf(stderr, "failed to allocate netlink callbacks\n");
 436                 return -ENOMEM;
 437         }
 438
 439         /* no sequence checking for multicast messages */
 440         nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, no_seq_check, NULL);
 441
 442         if (n_waits && waits) {
 443                 wait_ev.cmds = waits;
 444                 wait_ev.n_cmds = n_waits;
 445                 wait_ev.pargs = args;
 446                 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, wait_event, &wait_ev);
 447         } else
 448                 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_event, args);
 449
 450         wait_ev.cmd = 0;
 451
 452         while (!wait_ev.cmd)
 453                 nl_recvmsgs(state->nl_sock, cb);
 454
 455         nl_cb_put(cb);
 456
 457         return wait_ev.cmd;
 458 }
 459
 460 __u32 listen_events(struct nl80211_state *state,
 461                     const int n_waits, const __u32 *waits)
 462 {
 463         int ret;
 464
 465         ret = __prepare_listen_events(state);
 466         if (ret)
 467                 return ret;
 468
 469         return __do_listen_events(state, n_waits, waits, NULL);
 470 }
 471
 472 static int print_events(struct nl80211_state *state,
 473                         struct nl_cb *cb,
 474                         struct nl_msg *msg,
 475                         int argc, char **argv)
 476 {
 477         struct print_event_args args;
 478         int ret;
 479
 480         memset(&args, 0, sizeof(args));
 481
 482         argc--;
 483         argv++;
 484
 485         while (argc > 0) {
 486                 if (strcmp(argv[0], "-f") == 0)
 487                         args.frame = true;
 488                 else if (strcmp(argv[0], "-t") == 0)
 489                         args.time = true;
 490                 else if (strcmp(argv[0], "-r") == 0)
 491                         args.reltime = true;
 492                 else
 493                         return 1;
 494                 argc--;
 495                 argv++;
 496         }
 497
 498         if (args.time && args.reltime)
 499                 return 1;
 500
 501         if (argc)
 502                 return 1;
 503
 504         ret = __prepare_listen_events(state);
 505         if (ret)
 506                 return ret;
 507
 508         return __do_listen_events(state, 0, NULL, &args);
 509 }
 510 TOPLEVEL(event, "[-t] [-r] [-f]", 0, 0, CIB_NONE, print_events,
 511         "Monitor events from the kernel.\n"
 512         "-t - print timestamp\n"
 513         "-r - print relative timstamp\n"
 514         "-f - print full frame for auth/assoc etc.");