wpa_supplicant/ctrl_iface_unix.c

   1 /*
   2  * WPA Supplicant / UNIX domain socket -based control interface
   3  * Copyright (c) 2004-2005, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16 #include <sys/un.h>
  17 #include <sys/stat.h>
  18 #include <grp.h>
  19
  20 #include "common.h"
  21 #include "eloop.h"
  22 #include "config.h"
  23 #include "eapol_supp/eapol_supp_sm.h"
  24 #include "wpa_supplicant_i.h"
  25 #include "ctrl_iface.h"
  26
  27 /* Per-interface ctrl_iface */
  28
  29 /**
  30  * struct wpa_ctrl_dst - Internal data structure of control interface monitors
  31  *
  32  * This structure is used to store information about registered control
  33  * interface monitors into struct wpa_supplicant. This data is private to
  34  * ctrl_iface_unix.c and should not be touched directly from other files.
  35  */
  36 struct wpa_ctrl_dst {
  37         struct wpa_ctrl_dst *next;
  38         struct sockaddr_un addr;
  39         socklen_t addrlen;
  40         int debug_level;
  41         int errors;
  42 };
  43
  44
  45 struct ctrl_iface_priv {
  46         struct wpa_supplicant *wpa_s;
  47         int sock;
  48         struct wpa_ctrl_dst *ctrl_dst;
  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                                             struct sockaddr_un *from,
  59                                             socklen_t fromlen)
  60 {
  61         struct wpa_ctrl_dst *dst;
  62
  63         dst = os_zalloc(sizeof(*dst));
  64         if (dst == NULL)
  65                 return -1;
  66         os_memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
  67         dst->addrlen = fromlen;
  68         dst->debug_level = MSG_INFO;
  69         dst->next = priv->ctrl_dst;
  70         priv->ctrl_dst = dst;
  71         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
  72                     (u8 *) from->sun_path, fromlen - sizeof(from->sun_family));
  73         return 0;
  74 }
  75
  76
  77 static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
  78                                             struct sockaddr_un *from,
  79                                             socklen_t fromlen)
  80 {
  81         struct wpa_ctrl_dst *dst, *prev = NULL;
  82
  83         dst = priv->ctrl_dst;
  84         while (dst) {
  85                 if (fromlen == dst->addrlen &&
  86                     os_memcmp(from->sun_path, dst->addr.sun_path,
  87                               fromlen - sizeof(from->sun_family)) == 0) {
  88                         if (prev == NULL)
  89                                 priv->ctrl_dst = dst->next;
  90                         else
  91                                 prev->next = dst->next;
  92                         os_free(dst);
  93                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
  94                                     (u8 *) from->sun_path,
  95                                     fromlen - sizeof(from->sun_family));
  96                         return 0;
  97                 }
  98                 prev = dst;
  99                 dst = dst->next;
 100         }
 101         return -1;
 102 }
 103
 104
 105 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
 106                                            struct sockaddr_un *from,
 107                                            socklen_t fromlen,
 108                                            char *level)
 109 {
 110         struct wpa_ctrl_dst *dst;
 111
 112         wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
 113
 114         dst = priv->ctrl_dst;
 115         while (dst) {
 116                 if (fromlen == dst->addrlen &&
 117                     os_memcmp(from->sun_path, dst->addr.sun_path,
 118                               fromlen - sizeof(from->sun_family)) == 0) {
 119                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
 120                                     "level", (u8 *) from->sun_path,
 121                                     fromlen - sizeof(from->sun_family));
 122                         dst->debug_level = atoi(level);
 123                         return 0;
 124                 }
 125                 dst = dst->next;
 126         }
 127
 128         return -1;
 129 }
 130
 131
 132 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
 133                                               void *sock_ctx)
 134 {
 135         struct wpa_supplicant *wpa_s = eloop_ctx;
 136         struct ctrl_iface_priv *priv = sock_ctx;
 137         char buf[256];
 138         int res;
 139         struct sockaddr_un from;
 140         socklen_t fromlen = sizeof(from);
 141         char *reply = NULL;
 142         size_t reply_len = 0;
 143         int new_attached = 0;
 144
 145         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 146                        (struct sockaddr *) &from, &fromlen);
 147         if (res < 0) {
 148                 perror("recvfrom(ctrl_iface)");
 149                 return;
 150         }
 151         buf[res] = '\0';
 152
 153         if (os_strcmp(buf, "ATTACH") == 0) {
 154                 if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
 155                         reply_len = 1;
 156                 else {
 157                         new_attached = 1;
 158                         reply_len = 2;
 159                 }
 160         } else if (os_strcmp(buf, "DETACH") == 0) {
 161                 if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
 162                         reply_len = 1;
 163                 else
 164                         reply_len = 2;
 165         } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
 166                 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
 167                                                     buf + 6))
 168                         reply_len = 1;
 169                 else
 170                         reply_len = 2;
 171         } else {
 172                 reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
 173                                                           &reply_len);
 174         }
 175
 176         if (reply) {
 177                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 178                        fromlen);
 179                 os_free(reply);
 180         } else if (reply_len == 1) {
 181                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 182                        fromlen);
 183         } else if (reply_len == 2) {
 184                 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
 185                        fromlen);
 186         }
 187
 188         if (new_attached)
 189                 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
 190 }
 191
 192
 193 static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 194 {
 195         char *buf;
 196         size_t len;
 197         char *pbuf, *dir = NULL, *gid_str = NULL;
 198         int res;
 199
 200         if (wpa_s->conf->ctrl_interface == NULL)
 201                 return NULL;
 202
 203         pbuf = os_strdup(wpa_s->conf->ctrl_interface);
 204         if (pbuf == NULL)
 205                 return NULL;
 206         if (os_strncmp(pbuf, "DIR=", 4) == 0) {
 207                 dir = pbuf + 4;
 208                 gid_str = os_strstr(dir, " GROUP=");
 209                 if (gid_str) {
 210                         *gid_str = '\0';
 211                         gid_str += 7;
 212                 }
 213         } else
 214                 dir = pbuf;
 215
 216         len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
 217         buf = os_malloc(len);
 218         if (buf == NULL) {
 219                 os_free(pbuf);
 220                 return NULL;
 221         }
 222
 223         res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
 224         if (res < 0 || (size_t) res >= len) {
 225                 os_free(pbuf);
 226                 os_free(buf);
 227                 return NULL;
 228         }
 229 #ifdef __CYGWIN__
 230         {
 231                 /* Windows/WinPcap uses interface names that are not suitable
 232                  * as a file name - convert invalid chars to underscores */
 233                 char *pos = buf;
 234                 while (*pos) {
 235                         if (*pos == '\\')
 236                                 *pos = '_';
 237                         pos++;
 238                 }
 239         }
 240 #endif /* __CYGWIN__ */
 241         os_free(pbuf);
 242         return buf;
 243 }
 244
 245
 246 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
 247                                              const char *txt, size_t len)
 248 {
 249         struct wpa_supplicant *wpa_s = ctx;
 250         if (wpa_s == NULL || wpa_s->ctrl_iface == NULL)
 251                 return;
 252         wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
 253 }
 254
 255
 256 struct ctrl_iface_priv *
 257 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 258 {
 259         struct ctrl_iface_priv *priv;
 260         struct sockaddr_un addr;
 261         char *fname = NULL;
 262         gid_t gid = 0;
 263         int gid_set = 0;
 264         char *buf, *dir = NULL, *gid_str = NULL;
 265         struct group *grp;
 266         char *endp;
 267
 268         priv = os_zalloc(sizeof(*priv));
 269         if (priv == NULL)
 270                 return NULL;
 271         priv->wpa_s = wpa_s;
 272         priv->sock = -1;
 273
 274         if (wpa_s->conf->ctrl_interface == NULL)
 275                 return priv;
 276
 277         buf = os_strdup(wpa_s->conf->ctrl_interface);
 278         if (buf == NULL)
 279                 goto fail;
 280         if (os_strncmp(buf, "DIR=", 4) == 0) {
 281                 dir = buf + 4;
 282                 gid_str = os_strstr(dir, " GROUP=");
 283                 if (gid_str) {
 284                         *gid_str = '\0';
 285                         gid_str += 7;
 286                 }
 287         } else {
 288                 dir = buf;
 289                 gid_str = wpa_s->conf->ctrl_interface_group;
 290         }
 291
 292         if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
 293                 if (errno == EEXIST) {
 294                         wpa_printf(MSG_DEBUG, "Using existing control "
 295                                    "interface directory.");
 296                 } else {
 297                         perror("mkdir[ctrl_interface]");
 298                         goto fail;
 299                 }
 300         }
 301
 302         if (gid_str) {
 303                 grp = getgrnam(gid_str);
 304                 if (grp) {
 305                         gid = grp->gr_gid;
 306                         gid_set = 1;
 307                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
 308                                    " (from group name '%s')",
 309                                    (int) gid, gid_str);
 310                 } else {
 311                         /* Group name not found - try to parse this as gid */
 312                         gid = strtol(gid_str, &endp, 10);
 313                         if (*gid_str == '\0' || *endp != '\0') {
 314                                 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
 315                                            "'%s'", gid_str);
 316                                 goto fail;
 317                         }
 318                         gid_set = 1;
 319                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
 320                                    (int) gid);
 321                 }
 322         }
 323
 324         if (gid_set && chown(dir, -1, gid) < 0) {
 325                 perror("chown[ctrl_interface]");
 326                 goto fail;
 327         }
 328
 329         if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
 330             sizeof(addr.sun_path)) {
 331                 wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
 332                 goto fail;
 333         }
 334
 335         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 336         if (priv->sock < 0) {
 337                 perror("socket(PF_UNIX)");
 338                 goto fail;
 339         }
 340
 341         os_memset(&addr, 0, sizeof(addr));
 342         addr.sun_family = AF_UNIX;
 343         fname = wpa_supplicant_ctrl_iface_path(wpa_s);
 344         if (fname == NULL)
 345                 goto fail;
 346         os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
 347         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 348                 wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
 349                            strerror(errno));
 350                 if (connect(priv->sock, (struct sockaddr *) &addr,
 351                             sizeof(addr)) < 0) {
 352                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 353                                    " allow connections - assuming it was left"
 354                                    "over from forced program termination");
 355                         if (unlink(fname) < 0) {
 356                                 perror("unlink[ctrl_iface]");
 357                                 wpa_printf(MSG_ERROR, "Could not unlink "
 358                                            "existing ctrl_iface socket '%s'",
 359                                            fname);
 360                                 goto fail;
 361                         }
 362                         if (bind(priv->sock, (struct sockaddr *) &addr,
 363                                  sizeof(addr)) < 0) {
 364                                 perror("bind(PF_UNIX)");
 365                                 goto fail;
 366                         }
 367                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 368                                    "ctrl_iface socket '%s'", fname);
 369                 } else {
 370                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 371                                    "be in use - cannot override it");
 372                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 373                                    "not used anymore", fname);
 374                         os_free(fname);
 375                         fname = NULL;
 376                         goto fail;
 377                 }
 378         }
 379
 380         if (gid_set && chown(fname, -1, gid) < 0) {
 381                 perror("chown[ctrl_interface/ifname]");
 382                 goto fail;
 383         }
 384
 385         if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
 386                 perror("chmod[ctrl_interface/ifname]");
 387                 goto fail;
 388         }
 389         os_free(fname);
 390
 391         eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 392                                  wpa_s, priv);
 393         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 394
 395         os_free(buf);
 396         return priv;
 397
 398 fail:
 399         if (priv->sock >= 0)
 400                 close(priv->sock);
 401         os_free(priv);
 402         if (fname) {
 403                 unlink(fname);
 404                 os_free(fname);
 405         }
 406         os_free(buf);
 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                 char *fname;
 417                 char *buf, *dir = NULL, *gid_str = NULL;
 418                 eloop_unregister_read_sock(priv->sock);
 419                 if (priv->ctrl_dst) {
 420                         /*
 421                          * Wait a second before closing the control socket if
 422                          * there are any attached monitors in order to allow
 423                          * them to receive any pending messages.
 424                          */
 425                         wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 426                                    "monitors to receive messages");
 427                         os_sleep(1, 0);
 428                 }
 429                 close(priv->sock);
 430                 priv->sock = -1;
 431                 fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
 432                 if (fname) {
 433                         unlink(fname);
 434                         os_free(fname);
 435                 }
 436
 437                 buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
 438                 if (buf == NULL)
 439                         goto free_dst;
 440                 if (os_strncmp(buf, "DIR=", 4) == 0) {
 441                         dir = buf + 4;
 442                         gid_str = os_strstr(dir, " GROUP=");
 443                         if (gid_str) {
 444                                 *gid_str = '\0';
 445                                 gid_str += 7;
 446                         }
 447                 } else
 448                         dir = buf;
 449
 450                 if (rmdir(dir) < 0) {
 451                         if (errno == ENOTEMPTY) {
 452                                 wpa_printf(MSG_DEBUG, "Control interface "
 453                                            "directory not empty - leaving it "
 454                                            "behind");
 455                         } else {
 456                                 perror("rmdir[ctrl_interface]");
 457                         }
 458                 }
 459                 os_free(buf);
 460         }
 461
 462 free_dst:
 463         dst = priv->ctrl_dst;
 464         while (dst) {
 465                 prev = dst;
 466                 dst = dst->next;
 467                 os_free(prev);
 468         }
 469         os_free(priv);
 470 }
 471
 472
 473 /**
 474  * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
 475  * @priv: Pointer to private data from wpa_supplicant_ctrl_iface_init()
 476  * @level: Priority level of the message
 477  * @buf: Message data
 478  * @len: Message length
 479  *
 480  * Send a packet to all monitor programs attached to the control interface.
 481  */
 482 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
 483                                            int level, const char *buf,
 484                                            size_t len)
 485 {
 486         struct wpa_ctrl_dst *dst, *next;
 487         char levelstr[10];
 488         int idx, res;
 489         struct msghdr msg;
 490         struct iovec io[2];
 491
 492         dst = priv->ctrl_dst;
 493         if (priv->sock < 0 || dst == NULL)
 494                 return;
 495
 496         res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 497         if (res < 0 || (size_t) res >= sizeof(levelstr))
 498                 return;
 499         io[0].iov_base = levelstr;
 500         io[0].iov_len = os_strlen(levelstr);
 501         io[1].iov_base = (char *) buf;
 502         io[1].iov_len = len;
 503         os_memset(&msg, 0, sizeof(msg));
 504         msg.msg_iov = io;
 505         msg.msg_iovlen = 2;
 506
 507         idx = 0;
 508         while (dst) {
 509                 next = dst->next;
 510                 if (level >= dst->debug_level) {
 511                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
 512                                     (u8 *) dst->addr.sun_path, dst->addrlen -
 513                                     sizeof(dst->addr.sun_family));
 514                         msg.msg_name = (void *) &dst->addr;
 515                         msg.msg_namelen = dst->addrlen;
 516                         if (sendmsg(priv->sock, &msg, 0) < 0) {
 517                                 perror("sendmsg(CTRL_IFACE monitor)");
 518                                 dst->errors++;
 519                                 if (dst->errors > 10) {
 520                                         wpa_supplicant_ctrl_iface_detach(
 521                                                 priv, &dst->addr,
 522                                                 dst->addrlen);
 523                                 }
 524                         } else
 525                                 dst->errors = 0;
 526                 }
 527                 idx++;
 528                 dst = next;
 529         }
 530 }
 531
 532
 533 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 534 {
 535         char buf[256];
 536         int res;
 537         struct sockaddr_un from;
 538         socklen_t fromlen = sizeof(from);
 539
 540         for (;;) {
 541                 wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
 542                            "attach", priv->wpa_s->ifname);
 543                 eloop_wait_for_read_sock(priv->sock);
 544
 545                 res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
 546                                (struct sockaddr *) &from, &fromlen);
 547                 if (res < 0) {
 548                         perror("recvfrom(ctrl_iface)");
 549                         continue;
 550                 }
 551                 buf[res] = '\0';
 552
 553                 if (os_strcmp(buf, "ATTACH") == 0) {
 554                         /* handle ATTACH signal of first monitor interface */
 555                         if (!wpa_supplicant_ctrl_iface_attach(priv, &from,
 556                                                               fromlen)) {
 557                                 sendto(priv->sock, "OK\n", 3, 0,
 558                                        (struct sockaddr *) &from, fromlen);
 559                                 /* OK to continue */
 560                                 return;
 561                         } else {
 562                                 sendto(priv->sock, "FAIL\n", 5, 0,
 563                                        (struct sockaddr *) &from, fromlen);
 564                         }
 565                 } else {
 566                         /* return FAIL for all other signals */
 567                         sendto(priv->sock, "FAIL\n", 5, 0,
 568                                (struct sockaddr *) &from, fromlen);
 569                 }
 570         }
 571 }
 572
 573
 574 /* Global ctrl_iface */
 575
 576 struct ctrl_iface_global_priv {
 577         struct wpa_global *global;
 578         int sock;
 579 };
 580
 581
 582 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
 583                                                      void *sock_ctx)
 584 {
 585         struct wpa_global *global = eloop_ctx;
 586         char buf[256];
 587         int res;
 588         struct sockaddr_un from;
 589         socklen_t fromlen = sizeof(from);
 590         char *reply;
 591         size_t reply_len;
 592
 593         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 594                        (struct sockaddr *) &from, &fromlen);
 595         if (res < 0) {
 596                 perror("recvfrom(ctrl_iface)");
 597                 return;
 598         }
 599         buf[res] = '\0';
 600
 601         reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
 602                                                          &reply_len);
 603
 604         if (reply) {
 605                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 606                        fromlen);
 607                 os_free(reply);
 608         } else if (reply_len) {
 609                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 610                        fromlen);
 611         }
 612 }
 613
 614
 615 struct ctrl_iface_global_priv *
 616 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 617 {
 618         struct ctrl_iface_global_priv *priv;
 619         struct sockaddr_un addr;
 620
 621         priv = os_zalloc(sizeof(*priv));
 622         if (priv == NULL)
 623                 return NULL;
 624         priv->global = global;
 625         priv->sock = -1;
 626
 627         if (global->params.ctrl_interface == NULL)
 628                 return priv;
 629
 630         wpa_printf(MSG_DEBUG, "Global control interface '%s'",
 631                    global->params.ctrl_interface);
 632
 633         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 634         if (priv->sock < 0) {
 635                 perror("socket(PF_UNIX)");
 636                 goto fail;
 637         }
 638
 639         os_memset(&addr, 0, sizeof(addr));
 640         addr.sun_family = AF_UNIX;
 641         os_strlcpy(addr.sun_path, global->params.ctrl_interface,
 642                    sizeof(addr.sun_path));
 643         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 644                 perror("bind(PF_UNIX)");
 645                 if (connect(priv->sock, (struct sockaddr *) &addr,
 646                             sizeof(addr)) < 0) {
 647                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 648                                    " allow connections - assuming it was left"
 649                                    "over from forced program termination");
 650                         if (unlink(global->params.ctrl_interface) < 0) {
 651                                 perror("unlink[ctrl_iface]");
 652                                 wpa_printf(MSG_ERROR, "Could not unlink "
 653                                            "existing ctrl_iface socket '%s'",
 654                                            global->params.ctrl_interface);
 655                                 goto fail;
 656                         }
 657                         if (bind(priv->sock, (struct sockaddr *) &addr,
 658                                  sizeof(addr)) < 0) {
 659                                 perror("bind(PF_UNIX)");
 660                                 goto fail;
 661                         }
 662                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 663                                    "ctrl_iface socket '%s'",
 664                                    global->params.ctrl_interface);
 665                 } else {
 666                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 667                                    "be in use - cannot override it");
 668                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 669                                    "not used anymore",
 670                                    global->params.ctrl_interface);
 671                         goto fail;
 672                 }
 673         }
 674
 675         eloop_register_read_sock(priv->sock,
 676                                  wpa_supplicant_global_ctrl_iface_receive,
 677                                  global, NULL);
 678
 679         return priv;
 680
 681 fail:
 682         if (priv->sock >= 0)
 683                 close(priv->sock);
 684         os_free(priv);
 685         return NULL;
 686 }
 687
 688
 689 void
 690 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
 691 {
 692         if (priv->sock >= 0) {
 693                 eloop_unregister_read_sock(priv->sock);
 694                 close(priv->sock);
 695         }
 696         if (priv->global->params.ctrl_interface)
 697                 unlink(priv->global->params.ctrl_interface);
 698         os_free(priv);
 699 }