wpa_supplicant/ctrl_iface_udp.c

   1 /*
   2  * WPA Supplicant / UDP socket -based control interface
   3  * Copyright (c) 2004-2005, 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
  52 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
  53                                            int level, const char *buf,
  54                                            size_t len);
  55
  56
  57 static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
  58 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
  59                                             struct sockaddr_in6 *from,
  60 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
  61                                             struct sockaddr_in *from,
  62 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
  63                                             socklen_t fromlen)
  64 {
  65         struct wpa_ctrl_dst *dst;
  66 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
  67         char addr[INET6_ADDRSTRLEN];
  68 #endif /* CONFIG_UDP_IPV6 */
  69
  70         dst = os_zalloc(sizeof(*dst));
  71         if (dst == NULL)
  72                 return -1;
  73         os_memcpy(&dst->addr, from, sizeof(*from));
  74         dst->addrlen = fromlen;
  75         dst->debug_level = MSG_INFO;
  76         dst->next = priv->ctrl_dst;
  77         priv->ctrl_dst = dst;
  78 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
  79         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor attached %s:%d",
  80                    inet_ntop(AF_INET6, &from->sin6_addr, addr, sizeof(*from)),
  81                    ntohs(from->sin6_port));
  82 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
  83         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor attached %s:%d",
  84                    inet_ntoa(from->sin_addr), ntohs(from->sin_port));
  85 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
  86         return 0;
  87 }
  88
  89
  90 static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
  91 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
  92                                             struct sockaddr_in6 *from,
  93 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
  94                                             struct sockaddr_in *from,
  95 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
  96                                             socklen_t fromlen)
  97 {
  98         struct wpa_ctrl_dst *dst, *prev = NULL;
  99 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 100         char addr[INET6_ADDRSTRLEN];
 101 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 102
 103         dst = priv->ctrl_dst;
 104         while (dst) {
 105 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 106                 if (from->sin6_port == dst->addr.sin6_port &&
 107                     !os_memcmp(&from->sin6_addr, &dst->addr.sin6_addr,
 108                                sizeof(from->sin6_addr))) {
 109                         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached %s:%d",
 110                                    inet_ntop(AF_INET6, &from->sin6_addr, addr,
 111                                              sizeof(*from)),
 112                                    ntohs(from->sin6_port));
 113 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 114                 if (from->sin_addr.s_addr == dst->addr.sin_addr.s_addr &&
 115                     from->sin_port == dst->addr.sin_port) {
 116                         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached "
 117                                    "%s:%d", inet_ntoa(from->sin_addr),
 118                                    ntohs(from->sin_port));
 119 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 120                         if (prev == NULL)
 121                                 priv->ctrl_dst = dst->next;
 122                         else
 123                                 prev->next = dst->next;
 124                         os_free(dst);
 125                         return 0;
 126                 }
 127                 prev = dst;
 128                 dst = dst->next;
 129         }
 130         return -1;
 131 }
 132
 133
 134 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
 135 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 136                                            struct sockaddr_in6 *from,
 137 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 138                                            struct sockaddr_in *from,
 139 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 140                                            socklen_t fromlen,
 141                                            char *level)
 142 {
 143         struct wpa_ctrl_dst *dst;
 144 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 145         char addr[INET6_ADDRSTRLEN];
 146 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 147
 148         wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
 149
 150         dst = priv->ctrl_dst;
 151         while (dst) {
 152 #if CONFIG_CTRL_IFACE_UDP_IPV6
 153                 if (from->sin6_port == dst->addr.sin6_port &&
 154                     !os_memcmp(&from->sin6_addr, &dst->addr.sin6_addr,
 155                                sizeof(from->sin6_addr))) {
 156                         wpa_printf(MSG_DEBUG, "CTRL_IFACE changed monitor level %s:%d",
 157                                    inet_ntop(AF_INET6, &from->sin6_addr, addr,
 158                                              sizeof(*from)),
 159                                    ntohs(from->sin6_port));
 160 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 161                 if (from->sin_addr.s_addr == dst->addr.sin_addr.s_addr &&
 162                     from->sin_port == dst->addr.sin_port) {
 163                         wpa_printf(MSG_DEBUG, "CTRL_IFACE changed monitor "
 164                                    "level %s:%d", inet_ntoa(from->sin_addr),
 165                                    ntohs(from->sin_port));
 166 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 167                         dst->debug_level = atoi(level);
 168                         return 0;
 169                 }
 170                 dst = dst->next;
 171         }
 172
 173         return -1;
 174 }
 175
 176
 177 static char *
 178 wpa_supplicant_ctrl_iface_get_cookie(struct ctrl_iface_priv *priv,
 179                                      size_t *reply_len)
 180 {
 181         char *reply;
 182         reply = os_malloc(7 + 2 * COOKIE_LEN + 1);
 183         if (reply == NULL) {
 184                 *reply_len = 1;
 185                 return NULL;
 186         }
 187
 188         os_memcpy(reply, "COOKIE=", 7);
 189         wpa_snprintf_hex(reply + 7, 2 * COOKIE_LEN + 1,
 190                          priv->cookie, COOKIE_LEN);
 191
 192         *reply_len = 7 + 2 * COOKIE_LEN;
 193         return reply;
 194 }
 195
 196
 197 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
 198                                               void *sock_ctx)
 199 {
 200         struct wpa_supplicant *wpa_s = eloop_ctx;
 201         struct ctrl_iface_priv *priv = sock_ctx;
 202         char buf[256], *pos;
 203         int res;
 204 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 205         struct sockaddr_in6 from;
 206 #ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
 207         char addr[INET6_ADDRSTRLEN];
 208 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 209 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 210         struct sockaddr_in from;
 211 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 212         socklen_t fromlen = sizeof(from);
 213         char *reply = NULL;
 214         size_t reply_len = 0;
 215         int new_attached = 0;
 216         u8 cookie[COOKIE_LEN];
 217
 218         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 219                        (struct sockaddr *) &from, &fromlen);
 220         if (res < 0) {
 221                 perror("recvfrom(ctrl_iface)");
 222                 return;
 223         }
 224
 225 #ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
 226 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 227         inet_ntop(AF_INET6, &from.sin6_addr, addr, sizeof(from));
 228         if (os_strcmp(addr, "::1")) {
 229                 wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected source %s",
 230                            addr);
 231         }
 232 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 233         if (from.sin_addr.s_addr != htonl((127 << 24) | 1)) {
 234                 /*
 235                  * The OS networking stack is expected to drop this kind of
 236                  * frames since the socket is bound to only localhost address.
 237                  * Just in case, drop the frame if it is coming from any other
 238                  * address.
 239                  */
 240                 wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected "
 241                            "source %s", inet_ntoa(from.sin_addr));
 242                 return;
 243         }
 244 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 245 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 246
 247         buf[res] = '\0';
 248
 249         if (os_strcmp(buf, "GET_COOKIE") == 0) {
 250                 reply = wpa_supplicant_ctrl_iface_get_cookie(priv, &reply_len);
 251                 goto done;
 252         }
 253
 254         /*
 255          * Require that the client includes a prefix with the 'cookie' value
 256          * fetched with GET_COOKIE command. This is used to verify that the
 257          * client has access to a bidirectional link over UDP in order to
 258          * avoid attacks using forged localhost IP address even if the OS does
 259          * not block such frames from remote destinations.
 260          */
 261         if (os_strncmp(buf, "COOKIE=", 7) != 0) {
 262                 wpa_printf(MSG_DEBUG, "CTLR: No cookie in the request - "
 263                            "drop request");
 264                 return;
 265         }
 266
 267         if (hexstr2bin(buf + 7, cookie, COOKIE_LEN) < 0) {
 268                 wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie format in the "
 269                            "request - drop request");
 270                 return;
 271         }
 272
 273         if (os_memcmp(cookie, priv->cookie, COOKIE_LEN) != 0) {
 274                 wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie in the request - "
 275                            "drop request");
 276                 return;
 277         }
 278
 279         pos = buf + 7 + 2 * COOKIE_LEN;
 280         while (*pos == ' ')
 281                 pos++;
 282
 283         if (os_strcmp(pos, "ATTACH") == 0) {
 284                 if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
 285                         reply_len = 1;
 286                 else {
 287                         new_attached = 1;
 288                         reply_len = 2;
 289                 }
 290         } else if (os_strcmp(pos, "DETACH") == 0) {
 291                 if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
 292                         reply_len = 1;
 293                 else
 294                         reply_len = 2;
 295         } else if (os_strncmp(pos, "LEVEL ", 6) == 0) {
 296                 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
 297                                                     pos + 6))
 298                         reply_len = 1;
 299                 else
 300                         reply_len = 2;
 301         } else {
 302                 reply = wpa_supplicant_ctrl_iface_process(wpa_s, pos,
 303                                                           &reply_len);
 304         }
 305
 306  done:
 307         if (reply) {
 308                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 309                        fromlen);
 310                 os_free(reply);
 311         } else if (reply_len == 1) {
 312                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 313                        fromlen);
 314         } else if (reply_len == 2) {
 315                 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
 316                        fromlen);
 317         }
 318
 319         if (new_attached)
 320                 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
 321 }
 322
 323
 324 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level, int global,
 325                                              const char *txt, size_t len)
 326 {
 327         struct wpa_supplicant *wpa_s = ctx;
 328         if (wpa_s == NULL || wpa_s->ctrl_iface == NULL)
 329                 return;
 330         wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
 331 }
 332
 333
 334 struct ctrl_iface_priv *
 335 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 336 {
 337         struct ctrl_iface_priv *priv;
 338         int port = WPA_CTRL_IFACE_PORT;
 339 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 340         struct sockaddr_in6 addr;
 341         int domain = PF_INET6;
 342 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 343         struct sockaddr_in addr;
 344         int domain = PF_INET;
 345 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 346
 347         priv = os_zalloc(sizeof(*priv));
 348         if (priv == NULL)
 349                 return NULL;
 350         priv->wpa_s = wpa_s;
 351         priv->sock = -1;
 352         os_get_random(priv->cookie, COOKIE_LEN);
 353
 354         if (wpa_s->conf->ctrl_interface == NULL)
 355                 return priv;
 356
 357         priv->sock = socket(domain, SOCK_DGRAM, 0);
 358         if (priv->sock < 0) {
 359                 perror("socket(PF_INET)");
 360                 goto fail;
 361         }
 362
 363         os_memset(&addr, 0, sizeof(addr));
 364 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 365         addr.sin6_family = AF_INET6;
 366 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 367         addr.sin6_addr = in6addr_any;
 368 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 369         inet_pton(AF_INET6, "::1", &addr.sin6_addr);
 370 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 371 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 372         addr.sin_family = AF_INET;
 373 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 374         addr.sin_addr.s_addr = INADDR_ANY;
 375 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 376         addr.sin_addr.s_addr = htonl((127 << 24) | 1);
 377 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 378 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 379 try_again:
 380 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 381         addr.sin6_port = htons(port);
 382 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 383         addr.sin_port = htons(port);
 384 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 385         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 386                 port--;
 387                 if ((WPA_CTRL_IFACE_PORT - port) < WPA_CTRL_IFACE_PORT_LIMIT)
 388                         goto try_again;
 389                 perror("bind(AF_INET)");
 390                 goto fail;
 391         }
 392
 393 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 394         wpa_msg(wpa_s, MSG_DEBUG, "ctrl_iface_init UDP port: %d", port);
 395 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 396
 397         eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 398                                  wpa_s, priv);
 399         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 400
 401         return priv;
 402
 403 fail:
 404         if (priv->sock >= 0)
 405                 close(priv->sock);
 406         os_free(priv);
 407         return NULL;
 408 }
 409
 410
 411 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 412 {
 413         struct wpa_ctrl_dst *dst, *prev;
 414
 415         if (priv->sock > -1) {
 416                 eloop_unregister_read_sock(priv->sock);
 417                 if (priv->ctrl_dst) {
 418                         /*
 419                          * Wait before closing the control socket if
 420                          * there are any attached monitors in order to allow
 421                          * them to receive any pending messages.
 422                          */
 423                         wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 424                                    "monitors to receive messages");
 425                         os_sleep(0, 100000);
 426                 }
 427                 close(priv->sock);
 428                 priv->sock = -1;
 429         }
 430
 431         dst = priv->ctrl_dst;
 432         while (dst) {
 433                 prev = dst;
 434                 dst = dst->next;
 435                 os_free(prev);
 436         }
 437         os_free(priv);
 438 }
 439
 440
 441 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
 442                                            int level, const char *buf,
 443                                            size_t len)
 444 {
 445         struct wpa_ctrl_dst *dst, *next;
 446         char levelstr[10];
 447         int idx;
 448         char *sbuf;
 449         int llen;
 450 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 451         char addr[INET6_ADDRSTRLEN];
 452 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 453
 454         dst = priv->ctrl_dst;
 455         if (priv->sock < 0 || dst == NULL)
 456                 return;
 457
 458         os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 459
 460         llen = os_strlen(levelstr);
 461         sbuf = os_malloc(llen + len);
 462         if (sbuf == NULL)
 463                 return;
 464
 465         os_memcpy(sbuf, levelstr, llen);
 466         os_memcpy(sbuf + llen, buf, len);
 467
 468         idx = 0;
 469         while (dst) {
 470                 next = dst->next;
 471                 if (level >= dst->debug_level) {
 472 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 473                         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor send %s:%d",
 474                                    inet_ntop(AF_INET6, &dst->addr.sin6_addr,
 475                                              addr, sizeof(dst->addr)),
 476                                    ntohs(dst->addr.sin6_port));
 477 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 478                         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor send %s:%d",
 479                                    inet_ntoa(dst->addr.sin_addr),
 480                                    ntohs(dst->addr.sin_port));
 481 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 482                         if (sendto(priv->sock, sbuf, llen + len, 0,
 483                                    (struct sockaddr *) &dst->addr,
 484                                    sizeof(dst->addr)) < 0) {
 485                                 perror("sendto(CTRL_IFACE monitor)");
 486                                 dst->errors++;
 487                                 if (dst->errors > 10) {
 488                                         wpa_supplicant_ctrl_iface_detach(
 489                                                 priv, &dst->addr,
 490                                                 dst->addrlen);
 491                                 }
 492                         } else
 493                                 dst->errors = 0;
 494                 }
 495                 idx++;
 496                 dst = next;
 497         }
 498         os_free(sbuf);
 499 }
 500
 501
 502 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 503 {
 504         wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor",
 505                    priv->wpa_s->ifname);
 506         eloop_wait_for_read_sock(priv->sock);
 507 }
 508
 509
 510 /* Global ctrl_iface */
 511
 512 struct ctrl_iface_global_priv {
 513         int sock;
 514         u8 cookie[COOKIE_LEN];
 515 };
 516
 517
 518 static char *
 519 wpa_supplicant_global_get_cookie(struct ctrl_iface_global_priv *priv,
 520                                  size_t *reply_len)
 521 {
 522         char *reply;
 523         reply = os_malloc(7 + 2 * COOKIE_LEN + 1);
 524         if (reply == NULL) {
 525                 *reply_len = 1;
 526                 return NULL;
 527         }
 528
 529         os_memcpy(reply, "COOKIE=", 7);
 530         wpa_snprintf_hex(reply + 7, 2 * COOKIE_LEN + 1,
 531                          priv->cookie, COOKIE_LEN);
 532
 533         *reply_len = 7 + 2 * COOKIE_LEN;
 534         return reply;
 535 }
 536
 537
 538 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
 539                                                      void *sock_ctx)
 540 {
 541         struct wpa_global *global = eloop_ctx;
 542         struct ctrl_iface_global_priv *priv = sock_ctx;
 543         char buf[256], *pos;
 544         int res;
 545         struct sockaddr_in from;
 546         socklen_t fromlen = sizeof(from);
 547         char *reply;
 548         size_t reply_len;
 549         u8 cookie[COOKIE_LEN];
 550
 551         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 552                        (struct sockaddr *) &from, &fromlen);
 553         if (res < 0) {
 554                 perror("recvfrom(ctrl_iface)");
 555                 return;
 556         }
 557
 558 #ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
 559         if (from.sin_addr.s_addr != htonl((127 << 24) | 1)) {
 560                 /*
 561                  * The OS networking stack is expected to drop this kind of
 562                  * frames since the socket is bound to only localhost address.
 563                  * Just in case, drop the frame if it is coming from any other
 564                  * address.
 565                  */
 566                 wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected "
 567                            "source %s", inet_ntoa(from.sin_addr));
 568                 return;
 569         }
 570 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 571
 572         buf[res] = '\0';
 573
 574         if (os_strcmp(buf, "GET_COOKIE") == 0) {
 575                 reply = wpa_supplicant_global_get_cookie(priv, &reply_len);
 576                 goto done;
 577         }
 578
 579         if (os_strncmp(buf, "COOKIE=", 7) != 0) {
 580                 wpa_printf(MSG_DEBUG, "CTLR: No cookie in the request - "
 581                            "drop request");
 582                 return;
 583         }
 584
 585         if (hexstr2bin(buf + 7, cookie, COOKIE_LEN) < 0) {
 586                 wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie format in the "
 587                            "request - drop request");
 588                 return;
 589         }
 590
 591         if (os_memcmp(cookie, priv->cookie, COOKIE_LEN) != 0) {
 592                 wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie in the request - "
 593                            "drop request");
 594                 return;
 595         }
 596
 597         pos = buf + 7 + 2 * COOKIE_LEN;
 598         while (*pos == ' ')
 599                 pos++;
 600
 601         reply = wpa_supplicant_global_ctrl_iface_process(global, pos,
 602                                                          &reply_len);
 603
 604  done:
 605         if (reply) {
 606                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 607                        fromlen);
 608                 os_free(reply);
 609         } else if (reply_len) {
 610                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 611                        fromlen);
 612         }
 613 }
 614
 615
 616 struct ctrl_iface_global_priv *
 617 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 618 {
 619         struct ctrl_iface_global_priv *priv;
 620         struct sockaddr_in addr;
 621         int port = WPA_GLOBAL_CTRL_IFACE_PORT;
 622
 623         priv = os_zalloc(sizeof(*priv));
 624         if (priv == NULL)
 625                 return NULL;
 626         priv->sock = -1;
 627         os_get_random(priv->cookie, COOKIE_LEN);
 628
 629         if (global->params.ctrl_interface == NULL)
 630                 return priv;
 631
 632         wpa_printf(MSG_DEBUG, "Global control interface '%s'",
 633                    global->params.ctrl_interface);
 634
 635         priv->sock = socket(PF_INET, SOCK_DGRAM, 0);
 636         if (priv->sock < 0) {
 637                 perror("socket(PF_INET)");
 638                 goto fail;
 639         }
 640
 641         os_memset(&addr, 0, sizeof(addr));
 642         addr.sin_family = AF_INET;
 643 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 644         addr.sin_addr.s_addr = INADDR_ANY;
 645 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 646         addr.sin_addr.s_addr = htonl((127 << 24) | 1);
 647 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 648 try_again:
 649         addr.sin_port = htons(port);
 650         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 651                 port++;
 652                 if ((port - WPA_GLOBAL_CTRL_IFACE_PORT) <
 653                     WPA_GLOBAL_CTRL_IFACE_PORT_LIMIT)
 654                         goto try_again;
 655                 perror("bind(AF_INET)");
 656                 goto fail;
 657         }
 658
 659 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 660         wpa_printf(MSG_DEBUG, "global_ctrl_iface_init UDP port: %d", port);
 661 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 662
 663         eloop_register_read_sock(priv->sock,
 664                                  wpa_supplicant_global_ctrl_iface_receive,
 665                                  global, priv);
 666
 667         return priv;
 668
 669 fail:
 670         if (priv->sock >= 0)
 671                 close(priv->sock);
 672         os_free(priv);
 673         return NULL;
 674 }
 675
 676
 677 void
 678 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
 679 {
 680         if (priv->sock >= 0) {
 681                 eloop_unregister_read_sock(priv->sock);
 682                 close(priv->sock);
 683         }
 684         os_free(priv);
 685 }