wpa_supplicant/ctrl_iface_udp.c

   1 /*
   2  * WPA Supplicant / UDP socket -based control interface
   3  * Copyright (c) 2004-2016, 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
  11 #include "common.h"
  12 #include "eloop.h"
  13 #include "config.h"
  14 #include "eapol_supp/eapol_supp_sm.h"
  15 #include "wpa_supplicant_i.h"
  16 #include "ctrl_iface.h"
  17 #include "common/wpa_ctrl.h"
  18
  19
  20 #define COOKIE_LEN 8
  21
  22 /* Per-interface ctrl_iface */
  23
  24 /**
  25  * struct wpa_ctrl_dst - Internal data structure of control interface monitors
  26  *
  27  * This structure is used to store information about registered control
  28  * interface monitors into struct wpa_supplicant. This data is private to
  29  * ctrl_iface_udp.c and should not be touched directly from other files.
  30  */
  31 struct wpa_ctrl_dst {
  32         struct wpa_ctrl_dst *next;
  33 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
  34         struct sockaddr_in6 addr;
  35 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
  36         struct sockaddr_in addr;
  37 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
  38         socklen_t addrlen;
  39         int debug_level;
  40         int errors;
  41 };
  42
  43
  44 struct ctrl_iface_priv {
  45         struct wpa_supplicant *wpa_s;
  46         int sock;
  47         struct wpa_ctrl_dst *ctrl_dst;
  48         u8 cookie[COOKIE_LEN];
  49 };
  50
  51 struct ctrl_iface_global_priv {
  52         int sock;
  53         struct wpa_ctrl_dst *ctrl_dst;
  54         u8 cookie[COOKIE_LEN];
  55 };
  56
  57
  58 static void wpa_supplicant_ctrl_iface_send(struct wpa_supplicant *wpa_s,
  59                                            const char *ifname, int sock,
  60                                            struct wpa_ctrl_dst **head,
  61                                            int level, const char *buf,
  62                                            size_t len);
  63
  64
  65 static void wpas_ctrl_iface_free_dst(struct wpa_ctrl_dst *dst)
  66 {
  67         struct wpa_ctrl_dst *prev;
  68
  69         while (dst) {
  70                 prev = dst;
  71                 dst = dst->next;
  72                 os_free(prev);
  73         }
  74 }
  75
  76
  77 static int wpa_supplicant_ctrl_iface_attach(struct wpa_ctrl_dst **head,
  78 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
  79                                             struct sockaddr_in6 *from,
  80 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
  81                                             struct sockaddr_in *from,
  82 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
  83                                             socklen_t fromlen)
  84 {
  85         struct wpa_ctrl_dst *dst;
  86 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
  87         char addr[INET6_ADDRSTRLEN];
  88 #endif /* CONFIG_UDP_IPV6 */
  89
  90         dst = os_zalloc(sizeof(*dst));
  91         if (dst == NULL)
  92                 return -1;
  93         os_memcpy(&dst->addr, from, sizeof(*from));
  94         dst->addrlen = fromlen;
  95         dst->debug_level = MSG_INFO;
  96         dst->next = *head;
  97         *head = dst;
  98 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
  99         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor attached %s:%d",
 100                    inet_ntop(AF_INET6, &from->sin6_addr, addr, sizeof(*from)),
 101                    ntohs(from->sin6_port));
 102 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 103         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor attached %s:%d",
 104                    inet_ntoa(from->sin_addr), ntohs(from->sin_port));
 105 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 106         return 0;
 107 }
 108
 109
 110 static int wpa_supplicant_ctrl_iface_detach(struct wpa_ctrl_dst **head,
 111 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 112                                             struct sockaddr_in6 *from,
 113 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 114                                             struct sockaddr_in *from,
 115 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 116                                             socklen_t fromlen)
 117 {
 118         struct wpa_ctrl_dst *dst, *prev = NULL;
 119 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 120         char addr[INET6_ADDRSTRLEN];
 121 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 122
 123         dst = *head;
 124         while (dst) {
 125 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 126                 if (from->sin6_port == dst->addr.sin6_port &&
 127                     !os_memcmp(&from->sin6_addr, &dst->addr.sin6_addr,
 128                                sizeof(from->sin6_addr))) {
 129                         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached %s:%d",
 130                                    inet_ntop(AF_INET6, &from->sin6_addr, addr,
 131                                              sizeof(*from)),
 132                                    ntohs(from->sin6_port));
 133 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 134                 if (from->sin_addr.s_addr == dst->addr.sin_addr.s_addr &&
 135                     from->sin_port == dst->addr.sin_port) {
 136                         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached "
 137                                    "%s:%d", inet_ntoa(from->sin_addr),
 138                                    ntohs(from->sin_port));
 139 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 140                         if (prev == NULL)
 141                                 *head = dst->next;
 142                         else
 143                                 prev->next = dst->next;
 144                         os_free(dst);
 145                         return 0;
 146                 }
 147                 prev = dst;
 148                 dst = dst->next;
 149         }
 150         return -1;
 151 }
 152
 153
 154 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
 155 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 156                                            struct sockaddr_in6 *from,
 157 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 158                                            struct sockaddr_in *from,
 159 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 160                                            socklen_t fromlen,
 161                                            char *level)
 162 {
 163         struct wpa_ctrl_dst *dst;
 164 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 165         char addr[INET6_ADDRSTRLEN];
 166 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 167
 168         wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
 169
 170         dst = priv->ctrl_dst;
 171         while (dst) {
 172 #if CONFIG_CTRL_IFACE_UDP_IPV6
 173                 if (from->sin6_port == dst->addr.sin6_port &&
 174                     !os_memcmp(&from->sin6_addr, &dst->addr.sin6_addr,
 175                                sizeof(from->sin6_addr))) {
 176                         wpa_printf(MSG_DEBUG, "CTRL_IFACE changed monitor level %s:%d",
 177                                    inet_ntop(AF_INET6, &from->sin6_addr, addr,
 178                                              sizeof(*from)),
 179                                    ntohs(from->sin6_port));
 180 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 181                 if (from->sin_addr.s_addr == dst->addr.sin_addr.s_addr &&
 182                     from->sin_port == dst->addr.sin_port) {
 183                         wpa_printf(MSG_DEBUG, "CTRL_IFACE changed monitor "
 184                                    "level %s:%d", inet_ntoa(from->sin_addr),
 185                                    ntohs(from->sin_port));
 186 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 187                         dst->debug_level = atoi(level);
 188                         return 0;
 189                 }
 190                 dst = dst->next;
 191         }
 192
 193         return -1;
 194 }
 195
 196
 197 static char *
 198 wpa_supplicant_ctrl_iface_get_cookie(struct ctrl_iface_priv *priv,
 199                                      size_t *reply_len)
 200 {
 201         char *reply;
 202         reply = os_malloc(7 + 2 * COOKIE_LEN + 1);
 203         if (reply == NULL) {
 204                 *reply_len = 1;
 205                 return NULL;
 206         }
 207
 208         os_memcpy(reply, "COOKIE=", 7);
 209         wpa_snprintf_hex(reply + 7, 2 * COOKIE_LEN + 1,
 210                          priv->cookie, COOKIE_LEN);
 211
 212         *reply_len = 7 + 2 * COOKIE_LEN;
 213         return reply;
 214 }
 215
 216
 217 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
 218                                               void *sock_ctx)
 219 {
 220         struct wpa_supplicant *wpa_s = eloop_ctx;
 221         struct ctrl_iface_priv *priv = sock_ctx;
 222         char buf[256], *pos;
 223         int res;
 224 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 225         struct sockaddr_in6 from;
 226 #ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
 227         char addr[INET6_ADDRSTRLEN];
 228 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 229 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 230         struct sockaddr_in from;
 231 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 232         socklen_t fromlen = sizeof(from);
 233         char *reply = NULL;
 234         size_t reply_len = 0;
 235         int new_attached = 0;
 236         u8 cookie[COOKIE_LEN];
 237
 238         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 239                        (struct sockaddr *) &from, &fromlen);
 240         if (res < 0) {
 241                 wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
 242                            strerror(errno));
 243                 return;
 244         }
 245
 246 #ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
 247 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 248         inet_ntop(AF_INET6, &from.sin6_addr, addr, sizeof(from));
 249         if (os_strcmp(addr, "::1")) {
 250                 wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected source %s",
 251                            addr);
 252         }
 253 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 254         if (from.sin_addr.s_addr != htonl((127 << 24) | 1)) {
 255                 /*
 256                  * The OS networking stack is expected to drop this kind of
 257                  * frames since the socket is bound to only localhost address.
 258                  * Just in case, drop the frame if it is coming from any other
 259                  * address.
 260                  */
 261                 wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected "
 262                            "source %s", inet_ntoa(from.sin_addr));
 263                 return;
 264         }
 265 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 266 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 267
 268         buf[res] = '\0';
 269
 270         if (os_strcmp(buf, "GET_COOKIE") == 0) {
 271                 reply = wpa_supplicant_ctrl_iface_get_cookie(priv, &reply_len);
 272                 goto done;
 273         }
 274
 275         /*
 276          * Require that the client includes a prefix with the 'cookie' value
 277          * fetched with GET_COOKIE command. This is used to verify that the
 278          * client has access to a bidirectional link over UDP in order to
 279          * avoid attacks using forged localhost IP address even if the OS does
 280          * not block such frames from remote destinations.
 281          */
 282         if (os_strncmp(buf, "COOKIE=", 7) != 0) {
 283                 wpa_printf(MSG_DEBUG, "CTLR: No cookie in the request - "
 284                            "drop request");
 285                 return;
 286         }
 287
 288         if (hexstr2bin(buf + 7, cookie, COOKIE_LEN) < 0) {
 289                 wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie format in the "
 290                            "request - drop request");
 291                 return;
 292         }
 293
 294         if (os_memcmp(cookie, priv->cookie, COOKIE_LEN) != 0) {
 295                 wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie in the request - "
 296                            "drop request");
 297                 return;
 298         }
 299
 300         pos = buf + 7 + 2 * COOKIE_LEN;
 301         while (*pos == ' ')
 302                 pos++;
 303
 304         if (os_strcmp(pos, "ATTACH") == 0) {
 305                 if (wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst,
 306                                                      &from, fromlen))
 307                         reply_len = 1;
 308                 else {
 309                         new_attached = 1;
 310                         reply_len = 2;
 311                 }
 312         } else if (os_strcmp(pos, "DETACH") == 0) {
 313                 if (wpa_supplicant_ctrl_iface_detach(&priv->ctrl_dst,
 314                                                      &from, fromlen))
 315                         reply_len = 1;
 316                 else
 317                         reply_len = 2;
 318         } else if (os_strncmp(pos, "LEVEL ", 6) == 0) {
 319                 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
 320                                                     pos + 6))
 321                         reply_len = 1;
 322                 else
 323                         reply_len = 2;
 324         } else {
 325                 reply = wpa_supplicant_ctrl_iface_process(wpa_s, pos,
 326                                                           &reply_len);
 327         }
 328
 329  done:
 330         if (reply) {
 331                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 332                        fromlen);
 333                 os_free(reply);
 334         } else if (reply_len == 1) {
 335                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 336                        fromlen);
 337         } else if (reply_len == 2) {
 338                 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
 339                        fromlen);
 340         }
 341
 342         if (new_attached)
 343                 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
 344 }
 345
 346
 347 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
 348                                              enum wpa_msg_type type,
 349                                              const char *txt, size_t len)
 350 {
 351         struct wpa_supplicant *wpa_s = ctx;
 352
 353         if (!wpa_s)
 354                 return;
 355
 356         if (type != WPA_MSG_NO_GLOBAL && wpa_s->global->ctrl_iface) {
 357                 struct ctrl_iface_global_priv *priv = wpa_s->global->ctrl_iface;
 358
 359                 if (priv->ctrl_dst) {
 360                         wpa_supplicant_ctrl_iface_send(
 361                                 wpa_s,
 362                                 type != WPA_MSG_PER_INTERFACE ?
 363                                 NULL : wpa_s->ifname,
 364                                 priv->sock, &priv->ctrl_dst, level, txt, len);
 365                 }
 366         }
 367
 368         if (type == WPA_MSG_ONLY_GLOBAL || !wpa_s->ctrl_iface)
 369                 return;
 370
 371         wpa_supplicant_ctrl_iface_send(wpa_s, NULL, wpa_s->ctrl_iface->sock,
 372                                        &wpa_s->ctrl_iface->ctrl_dst,
 373                                        level, txt, len);
 374 }
 375
 376
 377 struct ctrl_iface_priv *
 378 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 379 {
 380         struct ctrl_iface_priv *priv;
 381         char port_str[40];
 382         int port = WPA_CTRL_IFACE_PORT;
 383         char *pos;
 384 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 385         struct sockaddr_in6 addr;
 386         int domain = PF_INET6;
 387 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 388         struct sockaddr_in addr;
 389         int domain = PF_INET;
 390 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 391
 392         priv = os_zalloc(sizeof(*priv));
 393         if (priv == NULL)
 394                 return NULL;
 395         priv->wpa_s = wpa_s;
 396         priv->sock = -1;
 397         os_get_random(priv->cookie, COOKIE_LEN);
 398
 399         if (wpa_s->conf->ctrl_interface == NULL)
 400                 return priv;
 401
 402         pos = os_strstr(wpa_s->conf->ctrl_interface, "udp:");
 403         if (pos) {
 404                 pos += 4;
 405                 port = atoi(pos);
 406                 if (port <= 0) {
 407                         wpa_printf(MSG_ERROR, "Invalid ctrl_iface UDP port: %s",
 408                                    wpa_s->conf->ctrl_interface);
 409                         goto fail;
 410                 }
 411         }
 412
 413         priv->sock = socket(domain, SOCK_DGRAM, 0);
 414         if (priv->sock < 0) {
 415                 wpa_printf(MSG_ERROR, "socket(PF_INET): %s", strerror(errno));
 416                 goto fail;
 417         }
 418
 419         os_memset(&addr, 0, sizeof(addr));
 420 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 421         addr.sin6_family = AF_INET6;
 422 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 423         addr.sin6_addr = in6addr_any;
 424 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 425         inet_pton(AF_INET6, "::1", &addr.sin6_addr);
 426 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 427 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 428         addr.sin_family = AF_INET;
 429 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 430         addr.sin_addr.s_addr = INADDR_ANY;
 431 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 432         addr.sin_addr.s_addr = htonl((127 << 24) | 1);
 433 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 434 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 435 try_again:
 436 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 437         addr.sin6_port = htons(port);
 438 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 439         addr.sin_port = htons(port);
 440 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 441         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 442                 port--;
 443                 if ((WPA_CTRL_IFACE_PORT - port) < WPA_CTRL_IFACE_PORT_LIMIT)
 444                         goto try_again;
 445                 wpa_printf(MSG_ERROR, "bind(AF_INET): %s", strerror(errno));
 446                 goto fail;
 447         }
 448
 449         /* Update the ctrl_interface value to match the selected port */
 450         os_snprintf(port_str, sizeof(port_str), "udp:%d", port);
 451         os_free(wpa_s->conf->ctrl_interface);
 452         wpa_s->conf->ctrl_interface = os_strdup(port_str);
 453         if (!wpa_s->conf->ctrl_interface) {
 454                 wpa_msg(wpa_s, MSG_ERROR, "Failed to malloc ctrl_interface");
 455                 goto fail;
 456         }
 457
 458 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 459         wpa_msg(wpa_s, MSG_DEBUG, "ctrl_iface_init UDP port: %d", port);
 460 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 461
 462         eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 463                                  wpa_s, priv);
 464         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 465
 466         return priv;
 467
 468 fail:
 469         if (priv->sock >= 0)
 470                 close(priv->sock);
 471         os_free(priv);
 472         return NULL;
 473 }
 474
 475
 476 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 477 {
 478         if (priv->sock > -1) {
 479                 eloop_unregister_read_sock(priv->sock);
 480                 if (priv->ctrl_dst) {
 481                         /*
 482                          * Wait before closing the control socket if
 483                          * there are any attached monitors in order to allow
 484                          * them to receive any pending messages.
 485                          */
 486                         wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 487                                    "monitors to receive messages");
 488                         os_sleep(0, 100000);
 489                 }
 490                 close(priv->sock);
 491                 priv->sock = -1;
 492         }
 493
 494         wpas_ctrl_iface_free_dst(priv->ctrl_dst);
 495         os_free(priv);
 496 }
 497
 498
 499 static void wpa_supplicant_ctrl_iface_send(struct wpa_supplicant *wpa_s,
 500                                            const char *ifname, int sock,
 501                                            struct wpa_ctrl_dst **head,
 502                                            int level, const char *buf,
 503                                            size_t len)
 504 {
 505         struct wpa_ctrl_dst *dst, *next;
 506         char levelstr[64];
 507         int idx;
 508         char *sbuf;
 509         int llen;
 510 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 511         char addr[INET6_ADDRSTRLEN];
 512 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 513
 514         dst = *head;
 515         if (sock < 0 || dst == NULL)
 516                 return;
 517
 518         if (ifname)
 519                 os_snprintf(levelstr, sizeof(levelstr), "IFACE=%s <%d>",
 520                             ifname, level);
 521         else
 522                 os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 523
 524         llen = os_strlen(levelstr);
 525         sbuf = os_malloc(llen + len);
 526         if (sbuf == NULL)
 527                 return;
 528
 529         os_memcpy(sbuf, levelstr, llen);
 530         os_memcpy(sbuf + llen, buf, len);
 531
 532         idx = 0;
 533         while (dst) {
 534                 next = dst->next;
 535                 if (level >= dst->debug_level) {
 536 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 537                         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor send %s:%d",
 538                                    inet_ntop(AF_INET6, &dst->addr.sin6_addr,
 539                                              addr, sizeof(dst->addr)),
 540                                    ntohs(dst->addr.sin6_port));
 541 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 542                         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor send %s:%d",
 543                                    inet_ntoa(dst->addr.sin_addr),
 544                                    ntohs(dst->addr.sin_port));
 545 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 546                         if (sendto(sock, sbuf, llen + len, 0,
 547                                    (struct sockaddr *) &dst->addr,
 548                                    sizeof(dst->addr)) < 0) {
 549                                 wpa_printf(MSG_ERROR,
 550                                            "sendto(CTRL_IFACE monitor): %s",
 551                                            strerror(errno));
 552                                 dst->errors++;
 553                                 if (dst->errors > 10) {
 554                                         wpa_supplicant_ctrl_iface_detach(
 555                                                 head, &dst->addr,
 556                                                 dst->addrlen);
 557                                 }
 558                         } else
 559                                 dst->errors = 0;
 560                 }
 561                 idx++;
 562                 dst = next;
 563         }
 564         os_free(sbuf);
 565 }
 566
 567
 568 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 569 {
 570         wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor",
 571                    priv->wpa_s->ifname);
 572         eloop_wait_for_read_sock(priv->sock);
 573 }
 574
 575
 576 /* Global ctrl_iface */
 577
 578 static char *
 579 wpa_supplicant_global_get_cookie(struct ctrl_iface_global_priv *priv,
 580                                  size_t *reply_len)
 581 {
 582         char *reply;
 583         reply = os_malloc(7 + 2 * COOKIE_LEN + 1);
 584         if (reply == NULL) {
 585                 *reply_len = 1;
 586                 return NULL;
 587         }
 588
 589         os_memcpy(reply, "COOKIE=", 7);
 590         wpa_snprintf_hex(reply + 7, 2 * COOKIE_LEN + 1,
 591                          priv->cookie, COOKIE_LEN);
 592
 593         *reply_len = 7 + 2 * COOKIE_LEN;
 594         return reply;
 595 }
 596
 597
 598 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
 599                                                      void *sock_ctx)
 600 {
 601         struct wpa_global *global = eloop_ctx;
 602         struct ctrl_iface_global_priv *priv = sock_ctx;
 603         char buf[256], *pos;
 604         int res;
 605 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 606         struct sockaddr_in6 from;
 607 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 608         struct sockaddr_in from;
 609 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 610         socklen_t fromlen = sizeof(from);
 611         char *reply = NULL;
 612         size_t reply_len;
 613         u8 cookie[COOKIE_LEN];
 614
 615         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 616                        (struct sockaddr *) &from, &fromlen);
 617         if (res < 0) {
 618                 wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
 619                            strerror(errno));
 620                 return;
 621         }
 622
 623 #ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
 624 #ifndef CONFIG_CTRL_IFACE_UDP_IPV6
 625         if (from.sin_addr.s_addr != htonl((127 << 24) | 1)) {
 626                 /*
 627                  * The OS networking stack is expected to drop this kind of
 628                  * frames since the socket is bound to only localhost address.
 629                  * Just in case, drop the frame if it is coming from any other
 630                  * address.
 631                  */
 632                 wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected "
 633                            "source %s", inet_ntoa(from.sin_addr));
 634                 return;
 635         }
 636 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 637 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 638
 639         buf[res] = '\0';
 640
 641         if (os_strcmp(buf, "GET_COOKIE") == 0) {
 642                 reply = wpa_supplicant_global_get_cookie(priv, &reply_len);
 643                 goto done;
 644         }
 645
 646         if (os_strncmp(buf, "COOKIE=", 7) != 0) {
 647                 wpa_printf(MSG_DEBUG, "CTLR: No cookie in the request - "
 648                            "drop request");
 649                 return;
 650         }
 651
 652         if (hexstr2bin(buf + 7, cookie, COOKIE_LEN) < 0) {
 653                 wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie format in the "
 654                            "request - drop request");
 655                 return;
 656         }
 657
 658         if (os_memcmp(cookie, priv->cookie, COOKIE_LEN) != 0) {
 659                 wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie in the request - "
 660                            "drop request");
 661                 return;
 662         }
 663
 664         pos = buf + 7 + 2 * COOKIE_LEN;
 665         while (*pos == ' ')
 666                 pos++;
 667
 668         if (os_strcmp(pos, "ATTACH") == 0) {
 669                 if (wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst,
 670                                                      &from, fromlen))
 671                         reply_len = 1;
 672                 else
 673                         reply_len = 2;
 674         } else if (os_strcmp(pos, "DETACH") == 0) {
 675                 if (wpa_supplicant_ctrl_iface_detach(&priv->ctrl_dst,
 676                                                      &from, fromlen))
 677                         reply_len = 1;
 678                 else
 679                         reply_len = 2;
 680         } else {
 681                 reply = wpa_supplicant_global_ctrl_iface_process(global, pos,
 682                                                                  &reply_len);
 683         }
 684
 685  done:
 686         if (reply) {
 687                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 688                        fromlen);
 689                 os_free(reply);
 690         } else if (reply_len == 1) {
 691                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 692                        fromlen);
 693         } else if (reply_len == 2) {
 694                 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
 695                        fromlen);
 696         }
 697 }
 698
 699
 700 struct ctrl_iface_global_priv *
 701 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 702 {
 703         struct ctrl_iface_global_priv *priv;
 704         struct sockaddr_in addr;
 705         char *pos;
 706         int port = WPA_GLOBAL_CTRL_IFACE_PORT;
 707
 708         priv = os_zalloc(sizeof(*priv));
 709         if (priv == NULL)
 710                 return NULL;
 711         priv->sock = -1;
 712         os_get_random(priv->cookie, COOKIE_LEN);
 713
 714         if (global->params.ctrl_interface == NULL)
 715                 return priv;
 716
 717         wpa_printf(MSG_DEBUG, "Global control interface '%s'",
 718                    global->params.ctrl_interface);
 719
 720         pos = os_strstr(global->params.ctrl_interface, "udp:");
 721         if (pos) {
 722                 pos += 4;
 723                 port = atoi(pos);
 724                 if (port <= 0) {
 725                         wpa_printf(MSG_ERROR, "Invalid global ctrl UDP port %s",
 726                                    global->params.ctrl_interface);
 727                         goto fail;
 728                 }
 729         }
 730
 731         priv->sock = socket(PF_INET, SOCK_DGRAM, 0);
 732         if (priv->sock < 0) {
 733                 wpa_printf(MSG_ERROR, "socket(PF_INET): %s", strerror(errno));
 734                 goto fail;
 735         }
 736
 737         os_memset(&addr, 0, sizeof(addr));
 738         addr.sin_family = AF_INET;
 739 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 740         addr.sin_addr.s_addr = INADDR_ANY;
 741 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 742         addr.sin_addr.s_addr = htonl((127 << 24) | 1);
 743 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 744 try_again:
 745         addr.sin_port = htons(port);
 746         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 747                 port++;
 748                 if ((port - WPA_GLOBAL_CTRL_IFACE_PORT) <
 749                     WPA_GLOBAL_CTRL_IFACE_PORT_LIMIT && !pos)
 750                         goto try_again;
 751                 wpa_printf(MSG_ERROR, "bind(AF_INET): %s", strerror(errno));
 752                 goto fail;
 753         }
 754
 755 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 756         wpa_printf(MSG_DEBUG, "global_ctrl_iface_init UDP port: %d", port);
 757 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 758
 759         eloop_register_read_sock(priv->sock,
 760                                  wpa_supplicant_global_ctrl_iface_receive,
 761                                  global, priv);
 762         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 763
 764         return priv;
 765
 766 fail:
 767         if (priv->sock >= 0)
 768                 close(priv->sock);
 769         os_free(priv);
 770         return NULL;
 771 }
 772
 773
 774 void
 775 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
 776 {
 777         if (priv->sock >= 0) {
 778                 eloop_unregister_read_sock(priv->sock);
 779                 close(priv->sock);
 780         }
 781
 782         wpas_ctrl_iface_free_dst(priv->ctrl_dst);
 783         os_free(priv);
 784 }