wpa_supplicant/wpa_priv.c

   1 /*
   2  * WPA Supplicant / privileged helper program
   3  * Copyright (c) 2007-2009, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10 #ifdef __linux__
  11 #include <fcntl.h>
  12 #endif /* __linux__ */
  13 #include <sys/un.h>
  14 #include <sys/stat.h>
  15
  16 #include "common.h"
  17 #include "eloop.h"
  18 #include "common/version.h"
  19 #include "drivers/driver.h"
  20 #include "l2_packet/l2_packet.h"
  21 #include "common/privsep_commands.h"
  22 #include "common/ieee802_11_defs.h"
  23
  24 #define WPA_PRIV_MAX_L2 3
  25
  26 struct wpa_priv_interface {
  27         struct wpa_priv_interface *next;
  28         char *driver_name;
  29         char *ifname;
  30         char *sock_name;
  31         int fd;
  32
  33         void *ctx;
  34
  35         const struct wpa_driver_ops *driver;
  36         void *drv_priv;
  37         void *drv_global_priv;
  38         struct sockaddr_un drv_addr;
  39         socklen_t drv_addr_len;
  40         int wpas_registered;
  41
  42         struct l2_packet_data *l2[WPA_PRIV_MAX_L2];
  43         struct sockaddr_un l2_addr[WPA_PRIV_MAX_L2];
  44         socklen_t l2_addr_len[WPA_PRIV_MAX_L2];
  45         struct wpa_priv_l2 {
  46                 struct wpa_priv_interface *parent;
  47                 int idx;
  48         } l2_ctx[WPA_PRIV_MAX_L2];
  49 };
  50
  51 struct wpa_priv_global {
  52         struct wpa_priv_interface *interfaces;
  53 };
  54
  55
  56 static void wpa_priv_cmd_register(struct wpa_priv_interface *iface,
  57                                   struct sockaddr_un *from, socklen_t fromlen)
  58 {
  59         int i;
  60
  61         if (iface->drv_priv) {
  62                 wpa_printf(MSG_DEBUG, "Cleaning up forgotten driver instance");
  63                 if (iface->driver->deinit)
  64                         iface->driver->deinit(iface->drv_priv);
  65                 iface->drv_priv = NULL;
  66                 if (iface->drv_global_priv) {
  67                         iface->driver->global_deinit(iface->drv_global_priv);
  68                         iface->drv_global_priv = NULL;
  69                 }
  70                 iface->wpas_registered = 0;
  71         }
  72
  73         for (i = 0; i < WPA_PRIV_MAX_L2; i++) {
  74                 if (iface->l2[i]) {
  75                         wpa_printf(MSG_DEBUG,
  76                                    "Cleaning up forgotten l2_packet instance");
  77                         l2_packet_deinit(iface->l2[i]);
  78                         iface->l2[i] = NULL;
  79                 }
  80         }
  81
  82         if (iface->driver->init2) {
  83                 if (iface->driver->global_init) {
  84                         iface->drv_global_priv =
  85                                 iface->driver->global_init(iface->ctx);
  86                         if (!iface->drv_global_priv) {
  87                                 wpa_printf(MSG_INFO,
  88                                            "Failed to initialize driver global context");
  89                                 return;
  90                         }
  91                 } else {
  92                         iface->drv_global_priv = NULL;
  93                 }
  94                 iface->drv_priv = iface->driver->init2(iface, iface->ifname,
  95                                                        iface->drv_global_priv);
  96         } else if (iface->driver->init) {
  97                 iface->drv_priv = iface->driver->init(iface, iface->ifname);
  98         } else {
  99                 return;
 100         }
 101         if (iface->drv_priv == NULL) {
 102                 wpa_printf(MSG_DEBUG, "Failed to initialize driver wrapper");
 103                 return;
 104         }
 105
 106         wpa_printf(MSG_DEBUG, "Driver wrapper '%s' initialized for interface "
 107                    "'%s'", iface->driver_name, iface->ifname);
 108
 109         os_memcpy(&iface->drv_addr, from, fromlen);
 110         iface->drv_addr_len = fromlen;
 111         iface->wpas_registered = 1;
 112
 113         if (iface->driver->set_param &&
 114             iface->driver->set_param(iface->drv_priv, NULL) < 0) {
 115                 wpa_printf(MSG_ERROR, "Driver interface rejected param");
 116         }
 117 }
 118
 119
 120 static void wpa_priv_cmd_unregister(struct wpa_priv_interface *iface,
 121                                     struct sockaddr_un *from)
 122 {
 123         if (iface->drv_priv) {
 124                 if (iface->driver->deinit)
 125                         iface->driver->deinit(iface->drv_priv);
 126                 iface->drv_priv = NULL;
 127                 if (iface->drv_global_priv) {
 128                         iface->driver->global_deinit(iface->drv_global_priv);
 129                         iface->drv_global_priv = NULL;
 130                 }
 131                 iface->wpas_registered = 0;
 132         }
 133 }
 134
 135
 136 static void wpa_priv_cmd_scan(struct wpa_priv_interface *iface,
 137                               void *buf, size_t len)
 138 {
 139         struct wpa_driver_scan_params params;
 140         struct privsep_cmd_scan *scan;
 141         unsigned int i;
 142         int freqs[PRIVSEP_MAX_SCAN_FREQS + 1];
 143
 144         if (iface->drv_priv == NULL)
 145                 return;
 146
 147         if (len < sizeof(*scan)) {
 148                 wpa_printf(MSG_DEBUG, "Invalid scan request");
 149                 return;
 150         }
 151
 152         scan = buf;
 153
 154         os_memset(&params, 0, sizeof(params));
 155         if (scan->num_ssids > WPAS_MAX_SCAN_SSIDS) {
 156                 wpa_printf(MSG_DEBUG, "Invalid scan request (num_ssids)");
 157                 return;
 158         }
 159         params.num_ssids = scan->num_ssids;
 160         for (i = 0; i < scan->num_ssids; i++) {
 161                 params.ssids[i].ssid = scan->ssids[i];
 162                 params.ssids[i].ssid_len = scan->ssid_lens[i];
 163         }
 164
 165         if (scan->num_freqs > PRIVSEP_MAX_SCAN_FREQS) {
 166                 wpa_printf(MSG_DEBUG, "Invalid scan request (num_freqs)");
 167                 return;
 168         }
 169         if (scan->num_freqs) {
 170                 for (i = 0; i < scan->num_freqs; i++)
 171                         freqs[i] = scan->freqs[i];
 172                 freqs[i] = 0;
 173                 params.freqs = freqs;
 174         }
 175
 176         if (iface->driver->scan2)
 177                 iface->driver->scan2(iface->drv_priv, &params);
 178 }
 179
 180
 181 static void wpa_priv_get_scan_results2(struct wpa_priv_interface *iface,
 182                                        struct sockaddr_un *from,
 183                                        socklen_t fromlen)
 184 {
 185         struct wpa_scan_results *res;
 186         u8 *buf = NULL, *pos, *end;
 187         int val;
 188         size_t i;
 189
 190         res = iface->driver->get_scan_results2(iface->drv_priv);
 191         if (res == NULL)
 192                 goto fail;
 193
 194         buf = os_malloc(60000);
 195         if (buf == NULL)
 196                 goto fail;
 197         pos = buf;
 198         end = buf + 60000;
 199         val = res->num;
 200         os_memcpy(pos, &val, sizeof(int));
 201         pos += sizeof(int);
 202
 203         for (i = 0; i < res->num; i++) {
 204                 struct wpa_scan_res *r = res->res[i];
 205                 val = sizeof(*r) + r->ie_len + r->beacon_ie_len;
 206                 if (end - pos < (int) sizeof(int) + val)
 207                         break;
 208                 os_memcpy(pos, &val, sizeof(int));
 209                 pos += sizeof(int);
 210                 os_memcpy(pos, r, val);
 211                 pos += val;
 212         }
 213
 214         sendto(iface->fd, buf, pos - buf, 0, (struct sockaddr *) from, fromlen);
 215
 216         os_free(buf);
 217         wpa_scan_results_free(res);
 218         return;
 219
 220 fail:
 221         os_free(buf);
 222         wpa_scan_results_free(res);
 223         sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
 224 }
 225
 226
 227 static void wpa_priv_cmd_get_scan_results(struct wpa_priv_interface *iface,
 228                                           struct sockaddr_un *from,
 229                                           socklen_t fromlen)
 230 {
 231         if (iface->drv_priv == NULL)
 232                 return;
 233
 234         if (iface->driver->get_scan_results2)
 235                 wpa_priv_get_scan_results2(iface, from, fromlen);
 236         else
 237                 sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
 238 }
 239
 240
 241 static void wpa_priv_cmd_authenticate(struct wpa_priv_interface *iface,
 242                                       void *buf, size_t len)
 243 {
 244         struct wpa_driver_auth_params params;
 245         struct privsep_cmd_authenticate *auth;
 246         int res, i;
 247
 248         if (iface->drv_priv == NULL || iface->driver->authenticate == NULL)
 249                 return;
 250
 251         if (len < sizeof(*auth)) {
 252                 wpa_printf(MSG_DEBUG, "Invalid authentication request");
 253                 return;
 254         }
 255
 256         auth = buf;
 257         if (sizeof(*auth) + auth->ie_len + auth->auth_data_len > len) {
 258                 wpa_printf(MSG_DEBUG, "Authentication request overflow");
 259                 return;
 260         }
 261
 262         os_memset(&params, 0, sizeof(params));
 263         params.freq = auth->freq;
 264         params.bssid = auth->bssid;
 265         params.ssid = auth->ssid;
 266         if (auth->ssid_len > SSID_MAX_LEN)
 267                 return;
 268         params.ssid_len = auth->ssid_len;
 269         params.auth_alg = auth->auth_alg;
 270         for (i = 0; i < 4; i++) {
 271                 if (auth->wep_key_len[i]) {
 272                         params.wep_key[i] = auth->wep_key[i];
 273                         params.wep_key_len[i] = auth->wep_key_len[i];
 274                 }
 275         }
 276         params.wep_tx_keyidx = auth->wep_tx_keyidx;
 277         params.local_state_change = auth->local_state_change;
 278         params.p2p = auth->p2p;
 279         if (auth->ie_len) {
 280                 params.ie = (u8 *) (auth + 1);
 281                 params.ie_len = auth->ie_len;
 282         }
 283         if (auth->auth_data_len) {
 284                 params.auth_data = ((u8 *) (auth + 1)) + auth->ie_len;
 285                 params.auth_data_len = auth->auth_data_len;
 286         }
 287
 288         res = iface->driver->authenticate(iface->drv_priv, &params);
 289         wpa_printf(MSG_DEBUG, "drv->authenticate: res=%d", res);
 290 }
 291
 292
 293 static void wpa_priv_cmd_associate(struct wpa_priv_interface *iface,
 294                                    void *buf, size_t len)
 295 {
 296         struct wpa_driver_associate_params params;
 297         struct privsep_cmd_associate *assoc;
 298         u8 *bssid;
 299         int res;
 300
 301         if (iface->drv_priv == NULL || iface->driver->associate == NULL)
 302                 return;
 303
 304         if (len < sizeof(*assoc)) {
 305                 wpa_printf(MSG_DEBUG, "Invalid association request");
 306                 return;
 307         }
 308
 309         assoc = buf;
 310         if (sizeof(*assoc) + assoc->wpa_ie_len > len) {
 311                 wpa_printf(MSG_DEBUG, "Association request overflow");
 312                 return;
 313         }
 314
 315         os_memset(&params, 0, sizeof(params));
 316         bssid = assoc->bssid;
 317         if (bssid[0] | bssid[1] | bssid[2] | bssid[3] | bssid[4] | bssid[5])
 318                 params.bssid = bssid;
 319         params.ssid = assoc->ssid;
 320         if (assoc->ssid_len > SSID_MAX_LEN)
 321                 return;
 322         params.ssid_len = assoc->ssid_len;
 323         params.freq.mode = assoc->hwmode;
 324         params.freq.freq = assoc->freq;
 325         params.freq.channel = assoc->channel;
 326         if (assoc->wpa_ie_len) {
 327                 params.wpa_ie = (u8 *) (assoc + 1);
 328                 params.wpa_ie_len = assoc->wpa_ie_len;
 329         }
 330         params.pairwise_suite = assoc->pairwise_suite;
 331         params.group_suite = assoc->group_suite;
 332         params.key_mgmt_suite = assoc->key_mgmt_suite;
 333         params.auth_alg = assoc->auth_alg;
 334         params.mode = assoc->mode;
 335
 336         res = iface->driver->associate(iface->drv_priv, &params);
 337         wpa_printf(MSG_DEBUG, "drv->associate: res=%d", res);
 338 }
 339
 340
 341 static void wpa_priv_cmd_get_bssid(struct wpa_priv_interface *iface,
 342                                    struct sockaddr_un *from, socklen_t fromlen)
 343 {
 344         u8 bssid[ETH_ALEN];
 345
 346         if (iface->drv_priv == NULL)
 347                 goto fail;
 348
 349         if (iface->driver->get_bssid == NULL ||
 350             iface->driver->get_bssid(iface->drv_priv, bssid) < 0)
 351                 goto fail;
 352
 353         sendto(iface->fd, bssid, ETH_ALEN, 0, (struct sockaddr *) from,
 354                fromlen);
 355         return;
 356
 357 fail:
 358         sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
 359 }
 360
 361
 362 static void wpa_priv_cmd_get_ssid(struct wpa_priv_interface *iface,
 363                                   struct sockaddr_un *from, socklen_t fromlen)
 364 {
 365         u8 ssid[sizeof(int) + SSID_MAX_LEN];
 366         int res;
 367
 368         if (iface->drv_priv == NULL)
 369                 goto fail;
 370
 371         if (iface->driver->get_ssid == NULL)
 372                 goto fail;
 373
 374         os_memset(ssid, 0, sizeof(ssid));
 375         res = iface->driver->get_ssid(iface->drv_priv, &ssid[sizeof(int)]);
 376         if (res < 0 || res > SSID_MAX_LEN)
 377                 goto fail;
 378         os_memcpy(ssid, &res, sizeof(int));
 379
 380         sendto(iface->fd, ssid, sizeof(ssid), 0, (struct sockaddr *) from,
 381                fromlen);
 382         return;
 383
 384 fail:
 385         sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
 386 }
 387
 388
 389 static void wpa_priv_cmd_set_key(struct wpa_priv_interface *iface,
 390                                  void *buf, size_t len)
 391 {
 392         struct privsep_cmd_set_key *params;
 393         int res;
 394         struct wpa_driver_set_key_params p;
 395
 396         if (iface->drv_priv == NULL || iface->driver->set_key == NULL)
 397                 return;
 398
 399         if (len != sizeof(*params)) {
 400                 wpa_printf(MSG_DEBUG, "Invalid set_key request");
 401                 return;
 402         }
 403
 404         params = buf;
 405
 406         os_memset(&p, 0, sizeof(p));
 407         p.ifname = iface->ifname;
 408         p.alg = params->alg;
 409         p.addr = params->addr;
 410         p.key_idx = params->key_idx;
 411         p.set_tx = params->set_tx;
 412         p.seq = params->seq_len ? params->seq : NULL;
 413         p.seq_len = params->seq_len;
 414         p.key = params->key_len ? params->key : NULL;
 415         p.key_len = params->key_len;
 416
 417         res = iface->driver->set_key(iface->drv_priv, &p);
 418         wpa_printf(MSG_DEBUG, "drv->set_key: res=%d", res);
 419 }
 420
 421
 422 static void wpa_priv_cmd_get_capa(struct wpa_priv_interface *iface,
 423                                   struct sockaddr_un *from, socklen_t fromlen)
 424 {
 425         struct wpa_driver_capa capa;
 426
 427         if (iface->drv_priv == NULL)
 428                 goto fail;
 429
 430         if (iface->driver->get_capa == NULL ||
 431             iface->driver->get_capa(iface->drv_priv, &capa) < 0)
 432                 goto fail;
 433
 434         /* For now, no support for passing extended_capa pointers */
 435         capa.extended_capa = NULL;
 436         capa.extended_capa_mask = NULL;
 437         capa.extended_capa_len = 0;
 438         sendto(iface->fd, &capa, sizeof(capa), 0, (struct sockaddr *) from,
 439                fromlen);
 440         return;
 441
 442 fail:
 443         sendto(iface->fd, "", 0, 0, (struct sockaddr *) from, fromlen);
 444 }
 445
 446
 447 static void wpa_priv_l2_rx(void *ctx, const u8 *src_addr, const u8 *buf,
 448                            size_t len)
 449 {
 450         struct wpa_priv_l2 *l2_ctx = ctx;
 451         struct wpa_priv_interface *iface = l2_ctx->parent;
 452         struct msghdr msg;
 453         struct iovec io[2];
 454
 455         io[0].iov_base = (u8 *) src_addr;
 456         io[0].iov_len = ETH_ALEN;
 457         io[1].iov_base = (u8 *) buf;
 458         io[1].iov_len = len;
 459
 460         os_memset(&msg, 0, sizeof(msg));
 461         msg.msg_iov = io;
 462         msg.msg_iovlen = 2;
 463         msg.msg_name = &iface->l2_addr[l2_ctx->idx];
 464         msg.msg_namelen = iface->l2_addr_len[l2_ctx->idx];
 465
 466         if (sendmsg(iface->fd, &msg, 0) < 0) {
 467                 wpa_printf(MSG_ERROR, "sendmsg(l2 rx): %s", strerror(errno));
 468         }
 469 }
 470
 471
 472 static int wpa_priv_allowed_l2_proto(u16 proto)
 473 {
 474         return proto == ETH_P_EAPOL || proto == ETH_P_RSN_PREAUTH ||
 475                 proto == ETH_P_80211_ENCAP;
 476 }
 477
 478
 479 static void wpa_priv_cmd_l2_register(struct wpa_priv_interface *iface,
 480                                      struct sockaddr_un *from,
 481                                      socklen_t fromlen,
 482                                      void *buf, size_t len)
 483 {
 484         int *reg_cmd = buf;
 485         u8 own_addr[ETH_ALEN];
 486         int res;
 487         u16 proto;
 488         int idx;
 489
 490         if (len != 2 * sizeof(int)) {
 491                 wpa_printf(MSG_DEBUG, "Invalid l2_register length %lu",
 492                            (unsigned long) len);
 493                 return;
 494         }
 495
 496         proto = reg_cmd[0];
 497         if (!wpa_priv_allowed_l2_proto(proto)) {
 498                 wpa_printf(MSG_DEBUG, "Refused l2_packet connection for "
 499                            "ethertype 0x%x", proto);
 500                 return;
 501         }
 502
 503         for (idx = 0; idx < WPA_PRIV_MAX_L2; idx++) {
 504                 if (!iface->l2[idx])
 505                         break;
 506         }
 507         if (idx == WPA_PRIV_MAX_L2) {
 508                 wpa_printf(MSG_DEBUG, "No free l2_packet connection found");
 509                 return;
 510         }
 511
 512         os_memcpy(&iface->l2_addr[idx], from, fromlen);
 513         iface->l2_addr_len[idx] = fromlen;
 514
 515         iface->l2_ctx[idx].idx = idx;
 516         iface->l2_ctx[idx].parent = iface;
 517         iface->l2[idx] = l2_packet_init(iface->ifname, NULL, proto,
 518                                         wpa_priv_l2_rx, &iface->l2_ctx[idx],
 519                                         reg_cmd[1]);
 520         if (!iface->l2[idx]) {
 521                 wpa_printf(MSG_DEBUG, "Failed to initialize l2_packet "
 522                            "instance for protocol %d", proto);
 523                 return;
 524         }
 525
 526         if (l2_packet_get_own_addr(iface->l2[idx], own_addr) < 0) {
 527                 wpa_printf(MSG_DEBUG, "Failed to get own address from "
 528                            "l2_packet");
 529                 l2_packet_deinit(iface->l2[idx]);
 530                 iface->l2[idx] = NULL;
 531                 return;
 532         }
 533
 534         res = sendto(iface->fd, own_addr, ETH_ALEN, 0,
 535                      (struct sockaddr *) from, fromlen);
 536         wpa_printf(MSG_DEBUG, "L2 registration[idx=%d]: res=%d", idx, res);
 537 }
 538
 539
 540 static void wpa_priv_cmd_l2_unregister(struct wpa_priv_interface *iface,
 541                                        struct sockaddr_un *from,
 542                                        socklen_t fromlen)
 543 {
 544         int idx;
 545
 546         for (idx = 0; idx < WPA_PRIV_MAX_L2; idx++) {
 547                 if (iface->l2_addr_len[idx] == fromlen &&
 548                     os_memcmp(&iface->l2_addr[idx], from, fromlen) == 0)
 549                         break;
 550         }
 551         if (idx == WPA_PRIV_MAX_L2) {
 552                 wpa_printf(MSG_DEBUG,
 553                            "No registered l2_packet socket found for unregister request");
 554                 return;
 555         }
 556
 557         if (iface->l2[idx]) {
 558                 l2_packet_deinit(iface->l2[idx]);
 559                 iface->l2[idx] = NULL;
 560         }
 561 }
 562
 563
 564 static void wpa_priv_cmd_l2_notify_auth_start(struct wpa_priv_interface *iface,
 565                                               struct sockaddr_un *from)
 566 {
 567         int idx;
 568
 569         for (idx = 0; idx < WPA_PRIV_MAX_L2; idx++) {
 570                 if (iface->l2[idx])
 571                         l2_packet_notify_auth_start(iface->l2[idx]);
 572         }
 573 }
 574
 575
 576 static void wpa_priv_cmd_l2_send(struct wpa_priv_interface *iface,
 577                                  struct sockaddr_un *from, socklen_t fromlen,
 578                                  void *buf, size_t len)
 579 {
 580         u8 *dst_addr;
 581         u16 proto;
 582         int res;
 583         int idx;
 584
 585         for (idx = 0; idx < WPA_PRIV_MAX_L2; idx++) {
 586                 if (iface->l2_addr_len[idx] == fromlen &&
 587                     os_memcmp(&iface->l2_addr[idx], from, fromlen) == 0)
 588                         break;
 589         }
 590         if (idx == WPA_PRIV_MAX_L2) {
 591                 wpa_printf(MSG_DEBUG,
 592                            "No registered l2_packet socket found for send request");
 593                 return;
 594         }
 595
 596         if (iface->l2[idx] == NULL)
 597                 return;
 598
 599         if (len < ETH_ALEN + 2) {
 600                 wpa_printf(MSG_DEBUG, "Too short L2 send packet (len=%lu)",
 601                            (unsigned long) len);
 602                 return;
 603         }
 604
 605         dst_addr = buf;
 606         os_memcpy(&proto, (char *) buf + ETH_ALEN, 2);
 607
 608         if (!wpa_priv_allowed_l2_proto(proto)) {
 609                 wpa_printf(MSG_DEBUG, "Refused l2_packet send for ethertype "
 610                            "0x%x", proto);
 611                 return;
 612         }
 613
 614         res = l2_packet_send(iface->l2[idx], dst_addr, proto,
 615                              (unsigned char *) buf + ETH_ALEN + 2,
 616                              len - ETH_ALEN - 2);
 617         wpa_printf(MSG_DEBUG, "L2 send[idx=%d]: res=%d", idx, res);
 618 }
 619
 620
 621 static void wpa_priv_cmd_set_country(struct wpa_priv_interface *iface,
 622                                      char *buf)
 623 {
 624         if (iface->drv_priv == NULL || iface->driver->set_country == NULL ||
 625             *buf == '\0')
 626                 return;
 627
 628         iface->driver->set_country(iface->drv_priv, buf);
 629 }
 630
 631
 632 static void wpa_priv_receive(int sock, void *eloop_ctx, void *sock_ctx)
 633 {
 634         struct wpa_priv_interface *iface = eloop_ctx;
 635         char buf[2000], *pos;
 636         void *cmd_buf;
 637         size_t cmd_len;
 638         int res, cmd;
 639         struct sockaddr_un from;
 640         socklen_t fromlen = sizeof(from);
 641
 642         res = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *) &from,
 643                        &fromlen);
 644         if (res < 0) {
 645                 wpa_printf(MSG_ERROR, "recvfrom: %s", strerror(errno));
 646                 return;
 647         }
 648
 649         if (res < (int) sizeof(int)) {
 650                 wpa_printf(MSG_DEBUG, "Too short command (len=%d)", res);
 651                 return;
 652         }
 653
 654         os_memcpy(&cmd, buf, sizeof(int));
 655         wpa_printf(MSG_DEBUG, "Command %d for interface %s",
 656                    cmd, iface->ifname);
 657         cmd_buf = &buf[sizeof(int)];
 658         cmd_len = res - sizeof(int);
 659
 660         switch (cmd) {
 661         case PRIVSEP_CMD_REGISTER:
 662                 wpa_priv_cmd_register(iface, &from, fromlen);
 663                 break;
 664         case PRIVSEP_CMD_UNREGISTER:
 665                 wpa_priv_cmd_unregister(iface, &from);
 666                 break;
 667         case PRIVSEP_CMD_SCAN:
 668                 wpa_priv_cmd_scan(iface, cmd_buf, cmd_len);
 669                 break;
 670         case PRIVSEP_CMD_GET_SCAN_RESULTS:
 671                 wpa_priv_cmd_get_scan_results(iface, &from, fromlen);
 672                 break;
 673         case PRIVSEP_CMD_ASSOCIATE:
 674                 wpa_priv_cmd_associate(iface, cmd_buf, cmd_len);
 675                 break;
 676         case PRIVSEP_CMD_GET_BSSID:
 677                 wpa_priv_cmd_get_bssid(iface, &from, fromlen);
 678                 break;
 679         case PRIVSEP_CMD_GET_SSID:
 680                 wpa_priv_cmd_get_ssid(iface, &from, fromlen);
 681                 break;
 682         case PRIVSEP_CMD_SET_KEY:
 683                 wpa_priv_cmd_set_key(iface, cmd_buf, cmd_len);
 684                 break;
 685         case PRIVSEP_CMD_GET_CAPA:
 686                 wpa_priv_cmd_get_capa(iface, &from, fromlen);
 687                 break;
 688         case PRIVSEP_CMD_L2_REGISTER:
 689                 wpa_priv_cmd_l2_register(iface, &from, fromlen,
 690                                          cmd_buf, cmd_len);
 691                 break;
 692         case PRIVSEP_CMD_L2_UNREGISTER:
 693                 wpa_priv_cmd_l2_unregister(iface, &from, fromlen);
 694                 break;
 695         case PRIVSEP_CMD_L2_NOTIFY_AUTH_START:
 696                 wpa_priv_cmd_l2_notify_auth_start(iface, &from);
 697                 break;
 698         case PRIVSEP_CMD_L2_SEND:
 699                 wpa_priv_cmd_l2_send(iface, &from, fromlen, cmd_buf, cmd_len);
 700                 break;
 701         case PRIVSEP_CMD_SET_COUNTRY:
 702                 pos = cmd_buf;
 703                 if (pos + cmd_len >= buf + sizeof(buf))
 704                         break;
 705                 pos[cmd_len] = '\0';
 706                 wpa_priv_cmd_set_country(iface, pos);
 707                 break;
 708         case PRIVSEP_CMD_AUTHENTICATE:
 709                 wpa_priv_cmd_authenticate(iface, cmd_buf, cmd_len);
 710                 break;
 711         }
 712 }
 713
 714
 715 static void wpa_priv_interface_deinit(struct wpa_priv_interface *iface)
 716 {
 717         int i;
 718
 719         if (iface->drv_priv) {
 720                 if (iface->driver->deinit)
 721                         iface->driver->deinit(iface->drv_priv);
 722                 if (iface->drv_global_priv)
 723                         iface->driver->global_deinit(iface->drv_global_priv);
 724         }
 725
 726         if (iface->fd >= 0) {
 727                 eloop_unregister_read_sock(iface->fd);
 728                 close(iface->fd);
 729                 unlink(iface->sock_name);
 730         }
 731
 732         for (i = 0; i < WPA_PRIV_MAX_L2; i++) {
 733                 if (iface->l2[i])
 734                         l2_packet_deinit(iface->l2[i]);
 735         }
 736
 737         os_free(iface->ifname);
 738         os_free(iface->driver_name);
 739         os_free(iface->sock_name);
 740         os_free(iface);
 741 }
 742
 743
 744 static struct wpa_priv_interface *
 745 wpa_priv_interface_init(void *ctx, const char *dir, const char *params)
 746 {
 747         struct wpa_priv_interface *iface;
 748         char *pos;
 749         size_t len;
 750         struct sockaddr_un addr;
 751         int i;
 752
 753         pos = os_strchr(params, ':');
 754         if (pos == NULL)
 755                 return NULL;
 756
 757         iface = os_zalloc(sizeof(*iface));
 758         if (iface == NULL)
 759                 return NULL;
 760         iface->fd = -1;
 761         iface->ctx = ctx;
 762
 763         len = pos - params;
 764         iface->driver_name = dup_binstr(params, len);
 765         if (iface->driver_name == NULL) {
 766                 wpa_priv_interface_deinit(iface);
 767                 return NULL;
 768         }
 769
 770         for (i = 0; wpa_drivers[i]; i++) {
 771                 if (os_strcmp(iface->driver_name,
 772                               wpa_drivers[i]->name) == 0) {
 773                         iface->driver = wpa_drivers[i];
 774                         break;
 775                 }
 776         }
 777         if (iface->driver == NULL) {
 778                 wpa_printf(MSG_ERROR, "Unsupported driver '%s'",
 779                            iface->driver_name);
 780                 wpa_priv_interface_deinit(iface);
 781                 return NULL;
 782         }
 783
 784         pos++;
 785         iface->ifname = os_strdup(pos);
 786         if (iface->ifname == NULL) {
 787                 wpa_priv_interface_deinit(iface);
 788                 return NULL;
 789         }
 790
 791         len = os_strlen(dir) + 1 + os_strlen(iface->ifname);
 792         iface->sock_name = os_malloc(len + 1);
 793         if (iface->sock_name == NULL) {
 794                 wpa_priv_interface_deinit(iface);
 795                 return NULL;
 796         }
 797
 798         os_snprintf(iface->sock_name, len + 1, "%s/%s", dir, iface->ifname);
 799         if (os_strlen(iface->sock_name) >= sizeof(addr.sun_path)) {
 800                 wpa_priv_interface_deinit(iface);
 801                 return NULL;
 802         }
 803
 804         iface->fd = socket(PF_UNIX, SOCK_DGRAM, 0);
 805         if (iface->fd < 0) {
 806                 wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
 807                 wpa_priv_interface_deinit(iface);
 808                 return NULL;
 809         }
 810
 811         os_memset(&addr, 0, sizeof(addr));
 812         addr.sun_family = AF_UNIX;
 813         os_strlcpy(addr.sun_path, iface->sock_name, sizeof(addr.sun_path));
 814
 815         if (bind(iface->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 816                 wpa_printf(MSG_DEBUG, "bind(PF_UNIX) failed: %s",
 817                            strerror(errno));
 818                 if (connect(iface->fd, (struct sockaddr *) &addr,
 819                             sizeof(addr)) < 0) {
 820                         wpa_printf(MSG_DEBUG, "Socket exists, but does not "
 821                                    "allow connections - assuming it was "
 822                                    "leftover from forced program termination");
 823                         if (unlink(iface->sock_name) < 0) {
 824                                 wpa_printf(MSG_ERROR,
 825                                            "Could not unlink existing ctrl_iface socket '%s': %s",
 826                                            iface->sock_name, strerror(errno));
 827                                 goto fail;
 828                         }
 829                         if (bind(iface->fd, (struct sockaddr *) &addr,
 830                                  sizeof(addr)) < 0) {
 831                                 wpa_printf(MSG_ERROR,
 832                                            "wpa-priv-iface-init: bind(PF_UNIX): %s",
 833                                            strerror(errno));
 834                                 goto fail;
 835                         }
 836                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 837                                    "socket '%s'", iface->sock_name);
 838                 } else {
 839                         wpa_printf(MSG_INFO, "Socket exists and seems to be "
 840                                    "in use - cannot override it");
 841                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 842                                    "not used anymore", iface->sock_name);
 843                         goto fail;
 844                 }
 845         }
 846
 847         if (chmod(iface->sock_name, S_IRWXU | S_IRWXG | S_IRWXO) < 0) {
 848                 wpa_printf(MSG_ERROR, "chmod: %s", strerror(errno));
 849                 goto fail;
 850         }
 851
 852         eloop_register_read_sock(iface->fd, wpa_priv_receive, iface, NULL);
 853
 854         return iface;
 855
 856 fail:
 857         wpa_priv_interface_deinit(iface);
 858         return NULL;
 859 }
 860
 861
 862 static int wpa_priv_send_event(struct wpa_priv_interface *iface, int event,
 863                                const void *data, size_t data_len)
 864 {
 865         struct msghdr msg;
 866         struct iovec io[2];
 867
 868         io[0].iov_base = &event;
 869         io[0].iov_len = sizeof(event);
 870         io[1].iov_base = (u8 *) data;
 871         io[1].iov_len = data_len;
 872
 873         os_memset(&msg, 0, sizeof(msg));
 874         msg.msg_iov = io;
 875         msg.msg_iovlen = data ? 2 : 1;
 876         msg.msg_name = &iface->drv_addr;
 877         msg.msg_namelen = iface->drv_addr_len;
 878
 879         if (sendmsg(iface->fd, &msg, 0) < 0) {
 880                 wpa_printf(MSG_ERROR, "sendmsg(wpas_socket): %s",
 881                            strerror(errno));
 882                 return -1;
 883         }
 884
 885         return 0;
 886 }
 887
 888
 889 static void wpa_priv_send_auth(struct wpa_priv_interface *iface,
 890                                union wpa_event_data *data)
 891 {
 892         size_t buflen = sizeof(struct privsep_event_auth) + data->auth.ies_len;
 893         struct privsep_event_auth *auth;
 894         u8 *buf, *pos;
 895
 896         buf = os_zalloc(buflen);
 897         if (buf == NULL)
 898                 return;
 899
 900         auth = (struct privsep_event_auth *) buf;
 901         pos = (u8 *) (auth + 1);
 902
 903         os_memcpy(auth->peer, data->auth.peer, ETH_ALEN);
 904         os_memcpy(auth->bssid, data->auth.bssid, ETH_ALEN);
 905         auth->auth_type = data->auth.auth_type;
 906         auth->auth_transaction = data->auth.auth_transaction;
 907         auth->status_code = data->auth.status_code;
 908         if (data->auth.ies) {
 909                 os_memcpy(pos, data->auth.ies, data->auth.ies_len);
 910                 auth->ies_len = data->auth.ies_len;
 911         }
 912
 913         wpa_priv_send_event(iface, PRIVSEP_EVENT_AUTH, buf, buflen);
 914
 915         os_free(buf);
 916 }
 917
 918
 919 static void wpa_priv_send_assoc(struct wpa_priv_interface *iface, int event,
 920                                 union wpa_event_data *data)
 921 {
 922         size_t buflen = 3 * sizeof(int);
 923         u8 *buf, *pos;
 924         int len;
 925
 926         if (data) {
 927                 buflen += data->assoc_info.req_ies_len +
 928                         data->assoc_info.resp_ies_len +
 929                         data->assoc_info.beacon_ies_len;
 930         }
 931
 932         buf = os_malloc(buflen);
 933         if (buf == NULL)
 934                 return;
 935
 936         pos = buf;
 937
 938         if (data && data->assoc_info.req_ies) {
 939                 len = data->assoc_info.req_ies_len;
 940                 os_memcpy(pos, &len, sizeof(int));
 941                 pos += sizeof(int);
 942                 os_memcpy(pos, data->assoc_info.req_ies, len);
 943                 pos += len;
 944         } else {
 945                 len = 0;
 946                 os_memcpy(pos, &len, sizeof(int));
 947                 pos += sizeof(int);
 948         }
 949
 950         if (data && data->assoc_info.resp_ies) {
 951                 len = data->assoc_info.resp_ies_len;
 952                 os_memcpy(pos, &len, sizeof(int));
 953                 pos += sizeof(int);
 954                 os_memcpy(pos, data->assoc_info.resp_ies, len);
 955                 pos += len;
 956         } else {
 957                 len = 0;
 958                 os_memcpy(pos, &len, sizeof(int));
 959                 pos += sizeof(int);
 960         }
 961
 962         if (data && data->assoc_info.beacon_ies) {
 963                 len = data->assoc_info.beacon_ies_len;
 964                 os_memcpy(pos, &len, sizeof(int));
 965                 pos += sizeof(int);
 966                 os_memcpy(pos, data->assoc_info.beacon_ies, len);
 967                 pos += len;
 968         } else {
 969                 len = 0;
 970                 os_memcpy(pos, &len, sizeof(int));
 971                 pos += sizeof(int);
 972         }
 973
 974         wpa_priv_send_event(iface, event, buf, buflen);
 975
 976         os_free(buf);
 977 }
 978
 979
 980 static void wpa_priv_send_interface_status(struct wpa_priv_interface *iface,
 981                                            union wpa_event_data *data)
 982 {
 983         int ievent;
 984         size_t len, maxlen;
 985         u8 *buf;
 986         char *ifname;
 987
 988         if (data == NULL)
 989                 return;
 990
 991         ievent = data->interface_status.ievent;
 992         maxlen = sizeof(data->interface_status.ifname);
 993         ifname = data->interface_status.ifname;
 994         for (len = 0; len < maxlen && ifname[len]; len++)
 995                 ;
 996
 997         buf = os_malloc(sizeof(int) + len);
 998         if (buf == NULL)
 999                 return;
1000
1001         os_memcpy(buf, &ievent, sizeof(int));
1002         os_memcpy(buf + sizeof(int), ifname, len);
1003
1004         wpa_priv_send_event(iface, PRIVSEP_EVENT_INTERFACE_STATUS,
1005                             buf, sizeof(int) + len);
1006
1007         os_free(buf);
1008
1009 }
1010
1011
1012 static void wpa_priv_send_ft_response(struct wpa_priv_interface *iface,
1013                                       union wpa_event_data *data)
1014 {
1015         size_t len;
1016         u8 *buf, *pos;
1017
1018         if (data == NULL || data->ft_ies.ies == NULL)
1019                 return;
1020
1021         len = sizeof(int) + ETH_ALEN + data->ft_ies.ies_len;
1022         buf = os_malloc(len);
1023         if (buf == NULL)
1024                 return;
1025
1026         pos = buf;
1027         os_memcpy(pos, &data->ft_ies.ft_action, sizeof(int));
1028         pos += sizeof(int);
1029         os_memcpy(pos, data->ft_ies.target_ap, ETH_ALEN);
1030         pos += ETH_ALEN;
1031         os_memcpy(pos, data->ft_ies.ies, data->ft_ies.ies_len);
1032
1033         wpa_priv_send_event(iface, PRIVSEP_EVENT_FT_RESPONSE, buf, len);
1034
1035         os_free(buf);
1036
1037 }
1038
1039
1040 void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
1041                           union wpa_event_data *data)
1042 {
1043         struct wpa_priv_interface *iface = ctx;
1044
1045         wpa_printf(MSG_DEBUG, "%s - event=%d", __func__, event);
1046
1047         if (!iface->wpas_registered) {
1048                 wpa_printf(MSG_DEBUG, "Driver event received, but "
1049                            "wpa_supplicant not registered");
1050                 return;
1051         }
1052
1053         switch (event) {
1054         case EVENT_ASSOC:
1055                 wpa_priv_send_assoc(iface, PRIVSEP_EVENT_ASSOC, data);
1056                 break;
1057         case EVENT_DISASSOC:
1058                 wpa_priv_send_event(iface, PRIVSEP_EVENT_DISASSOC, NULL, 0);
1059                 break;
1060         case EVENT_ASSOCINFO:
1061                 if (data == NULL)
1062                         return;
1063                 wpa_priv_send_assoc(iface, PRIVSEP_EVENT_ASSOCINFO, data);
1064                 break;
1065         case EVENT_MICHAEL_MIC_FAILURE:
1066                 if (data == NULL)
1067                         return;
1068                 wpa_priv_send_event(iface, PRIVSEP_EVENT_MICHAEL_MIC_FAILURE,
1069                                     &data->michael_mic_failure.unicast,
1070                                     sizeof(int));
1071                 break;
1072         case EVENT_SCAN_STARTED:
1073                 wpa_priv_send_event(iface, PRIVSEP_EVENT_SCAN_STARTED, NULL,
1074                                     0);
1075                 break;
1076         case EVENT_SCAN_RESULTS:
1077                 wpa_priv_send_event(iface, PRIVSEP_EVENT_SCAN_RESULTS, NULL,
1078                                     0);
1079                 break;
1080         case EVENT_INTERFACE_STATUS:
1081                 wpa_priv_send_interface_status(iface, data);
1082                 break;
1083         case EVENT_PMKID_CANDIDATE:
1084                 if (data == NULL)
1085                         return;
1086                 wpa_priv_send_event(iface, PRIVSEP_EVENT_PMKID_CANDIDATE,
1087                                     &data->pmkid_candidate,
1088                                     sizeof(struct pmkid_candidate));
1089                 break;
1090         case EVENT_FT_RESPONSE:
1091                 wpa_priv_send_ft_response(iface, data);
1092                 break;
1093         case EVENT_AUTH:
1094                 wpa_priv_send_auth(iface, data);
1095                 break;
1096         default:
1097                 wpa_printf(MSG_DEBUG, "Unsupported driver event %d (%s) - TODO",
1098                            event, event_to_string(event));
1099                 break;
1100         }
1101 }
1102
1103
1104 void wpa_supplicant_event_global(void *ctx, enum wpa_event_type event,
1105                                  union wpa_event_data *data)
1106 {
1107         struct wpa_priv_global *global = ctx;
1108         struct wpa_priv_interface *iface;
1109
1110         if (event != EVENT_INTERFACE_STATUS)
1111                 return;
1112
1113         for (iface = global->interfaces; iface; iface = iface->next) {
1114                 if (os_strcmp(iface->ifname, data->interface_status.ifname) ==
1115                     0)
1116                         break;
1117         }
1118         if (iface && iface->driver->get_ifindex) {
1119                 unsigned int ifindex;
1120
1121                 ifindex = iface->driver->get_ifindex(iface->drv_priv);
1122                 if (ifindex != data->interface_status.ifindex) {
1123                         wpa_printf(MSG_DEBUG,
1124                                    "%s: interface status ifindex %d mismatch (%d)",
1125                                    iface->ifname, ifindex,
1126                                    data->interface_status.ifindex);
1127                         return;
1128                 }
1129         }
1130         if (iface)
1131                 wpa_supplicant_event(iface, event, data);
1132 }
1133
1134
1135 void wpa_supplicant_rx_eapol(void *ctx, const u8 *src_addr,
1136                              const u8 *buf, size_t len)
1137 {
1138         struct wpa_priv_interface *iface = ctx;
1139         struct msghdr msg;
1140         struct iovec io[3];
1141         int event = PRIVSEP_EVENT_RX_EAPOL;
1142
1143         wpa_printf(MSG_DEBUG, "RX EAPOL from driver");
1144         io[0].iov_base = &event;
1145         io[0].iov_len = sizeof(event);
1146         io[1].iov_base = (u8 *) src_addr;
1147         io[1].iov_len = ETH_ALEN;
1148         io[2].iov_base = (u8 *) buf;
1149         io[2].iov_len = len;
1150
1151         os_memset(&msg, 0, sizeof(msg));
1152         msg.msg_iov = io;
1153         msg.msg_iovlen = 3;
1154         msg.msg_name = &iface->drv_addr;
1155         msg.msg_namelen = iface->drv_addr_len;
1156
1157         if (sendmsg(iface->fd, &msg, 0) < 0)
1158                 wpa_printf(MSG_ERROR, "sendmsg(wpas_socket): %s",
1159                            strerror(errno));
1160 }
1161
1162
1163 static void wpa_priv_terminate(int sig, void *signal_ctx)
1164 {
1165         wpa_printf(MSG_DEBUG, "wpa_priv termination requested");
1166         eloop_terminate();
1167 }
1168
1169
1170 static void wpa_priv_fd_workaround(void)
1171 {
1172 #ifdef __linux__
1173         int s, i;
1174         /* When started from pcmcia-cs scripts, wpa_supplicant might start with
1175          * fd 0, 1, and 2 closed. This will cause some issues because many
1176          * places in wpa_supplicant are still printing out to stdout. As a
1177          * workaround, make sure that fd's 0, 1, and 2 are not used for other
1178          * sockets. */
1179         for (i = 0; i < 3; i++) {
1180                 s = open("/dev/null", O_RDWR);
1181                 if (s > 2) {
1182                         close(s);
1183                         break;
1184                 }
1185         }
1186 #endif /* __linux__ */
1187 }
1188
1189
1190 static void usage(void)
1191 {
1192         printf("wpa_priv v%s\n"
1193                "Copyright (c) 2007-2017, Jouni Malinen <j@w1.fi> and "
1194                "contributors\n"
1195                "\n"
1196                "usage:\n"
1197                "  wpa_priv [-Bdd] [-c<ctrl dir>] [-P<pid file>] "
1198                "<driver:ifname> \\\n"
1199                "           [driver:ifname ...]\n",
1200                VERSION_STR);
1201 }
1202
1203
1204 int main(int argc, char *argv[])
1205 {
1206         int c, i;
1207         int ret = -1;
1208         char *pid_file = NULL;
1209         int daemonize = 0;
1210         char *ctrl_dir = "/var/run/wpa_priv";
1211         struct wpa_priv_global global;
1212         struct wpa_priv_interface *iface;
1213
1214         if (os_program_init())
1215                 return -1;
1216
1217         wpa_priv_fd_workaround();
1218
1219         os_memset(&global, 0, sizeof(global));
1220         global.interfaces = NULL;
1221
1222         for (;;) {
1223                 c = getopt(argc, argv, "Bc:dP:");
1224                 if (c < 0)
1225                         break;
1226                 switch (c) {
1227                 case 'B':
1228                         daemonize++;
1229                         break;
1230                 case 'c':
1231                         ctrl_dir = optarg;
1232                         break;
1233                 case 'd':
1234                         wpa_debug_level--;
1235                         break;
1236                 case 'P':
1237                         pid_file = os_rel2abs_path(optarg);
1238                         break;
1239                 default:
1240                         usage();
1241                         goto out2;
1242                 }
1243         }
1244
1245         if (optind >= argc) {
1246                 usage();
1247                 goto out2;
1248         }
1249
1250         wpa_printf(MSG_DEBUG, "wpa_priv control directory: '%s'", ctrl_dir);
1251
1252         if (eloop_init()) {
1253                 wpa_printf(MSG_ERROR, "Failed to initialize event loop");
1254                 goto out2;
1255         }
1256
1257         for (i = optind; i < argc; i++) {
1258                 wpa_printf(MSG_DEBUG, "Adding driver:interface %s", argv[i]);
1259                 iface = wpa_priv_interface_init(&global, ctrl_dir, argv[i]);
1260                 if (iface == NULL)
1261                         goto out;
1262                 iface->next = global.interfaces;
1263                 global.interfaces = iface;
1264         }
1265
1266         if (daemonize && os_daemonize(pid_file) && eloop_sock_requeue())
1267                 goto out;
1268
1269         eloop_register_signal_terminate(wpa_priv_terminate, NULL);
1270         eloop_run();
1271
1272         ret = 0;
1273
1274 out:
1275         iface = global.interfaces;
1276         while (iface) {
1277                 struct wpa_priv_interface *prev = iface;
1278                 iface = iface->next;
1279                 wpa_priv_interface_deinit(prev);
1280         }
1281
1282         eloop_destroy();
1283
1284 out2:
1285         if (daemonize)
1286                 os_daemonize_terminate(pid_file);
1287         os_free(pid_file);
1288         os_program_deinit();
1289
1290         return ret;
1291 }