wpa_supplicant/ctrl_iface_unix.c

   1 /*
   2  * WPA Supplicant / UNIX domain socket -based control interface
   3  * Copyright (c) 2004-2009, 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 #include <stddef.h>
  20
  21 #include "utils/common.h"
  22 #include "utils/eloop.h"
  23 #include "utils/list.h"
  24 #include "eapol_supp/eapol_supp_sm.h"
  25 #include "config.h"
  26 #include "wpa_supplicant_i.h"
  27 #include "ctrl_iface.h"
  28
  29 /* Per-interface ctrl_iface */
  30
  31 /**
  32  * struct wpa_ctrl_dst - Internal data structure of control interface monitors
  33  *
  34  * This structure is used to store information about registered control
  35  * interface monitors into struct wpa_supplicant. This data is private to
  36  * ctrl_iface_unix.c and should not be touched directly from other files.
  37  */
  38 struct wpa_ctrl_dst {
  39         struct dl_list list;
  40         struct sockaddr_un addr;
  41         socklen_t addrlen;
  42         int debug_level;
  43         int errors;
  44 };
  45
  46
  47 struct ctrl_iface_priv {
  48         struct wpa_supplicant *wpa_s;
  49         int sock;
  50         struct dl_list ctrl_dst;
  51 };
  52
  53
  54 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
  55                                            int level, const char *buf,
  56                                            size_t len);
  57
  58
  59 static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
  60                                             struct sockaddr_un *from,
  61                                             socklen_t fromlen)
  62 {
  63         struct wpa_ctrl_dst *dst;
  64
  65         dst = os_zalloc(sizeof(*dst));
  66         if (dst == NULL)
  67                 return -1;
  68         os_memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
  69         dst->addrlen = fromlen;
  70         dst->debug_level = MSG_INFO;
  71         dl_list_add(&priv->ctrl_dst, &dst->list);
  72         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
  73                     (u8 *) from->sun_path,
  74                     fromlen - offsetof(struct sockaddr_un, sun_path));
  75         return 0;
  76 }
  77
  78
  79 static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
  80                                             struct sockaddr_un *from,
  81                                             socklen_t fromlen)
  82 {
  83         struct wpa_ctrl_dst *dst;
  84
  85         dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
  86                 if (fromlen == dst->addrlen &&
  87                     os_memcmp(from->sun_path, dst->addr.sun_path,
  88                               fromlen - offsetof(struct sockaddr_un, sun_path))
  89                     == 0) {
  90                         dl_list_del(&dst->list);
  91                         os_free(dst);
  92                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
  93                                     (u8 *) from->sun_path,
  94                                     fromlen -
  95                                     offsetof(struct sockaddr_un, sun_path));
  96                         return 0;
  97                 }
  98         }
  99         return -1;
 100 }
 101
 102
 103 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
 104                                            struct sockaddr_un *from,
 105                                            socklen_t fromlen,
 106                                            char *level)
 107 {
 108         struct wpa_ctrl_dst *dst;
 109
 110         wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
 111
 112         dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
 113                 if (fromlen == dst->addrlen &&
 114                     os_memcmp(from->sun_path, dst->addr.sun_path,
 115                               fromlen - offsetof(struct sockaddr_un, sun_path))
 116                     == 0) {
 117                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
 118                                     "level", (u8 *) from->sun_path,
 119                                     fromlen -
 120                                     offsetof(struct sockaddr_un, sun_path));
 121                         dst->debug_level = atoi(level);
 122                         return 0;
 123                 }
 124         }
 125
 126         return -1;
 127 }
 128
 129
 130 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
 131                                               void *sock_ctx)
 132 {
 133         struct wpa_supplicant *wpa_s = eloop_ctx;
 134         struct ctrl_iface_priv *priv = sock_ctx;
 135         char buf[256];
 136         int res;
 137         struct sockaddr_un from;
 138         socklen_t fromlen = sizeof(from);
 139         char *reply = NULL;
 140         size_t reply_len = 0;
 141         int new_attached = 0;
 142
 143         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 144                        (struct sockaddr *) &from, &fromlen);
 145         if (res < 0) {
 146                 perror("recvfrom(ctrl_iface)");
 147                 return;
 148         }
 149         buf[res] = '\0';
 150
 151         if (os_strcmp(buf, "ATTACH") == 0) {
 152                 if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
 153                         reply_len = 1;
 154                 else {
 155                         new_attached = 1;
 156                         reply_len = 2;
 157                 }
 158         } else if (os_strcmp(buf, "DETACH") == 0) {
 159                 if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
 160                         reply_len = 1;
 161                 else
 162                         reply_len = 2;
 163         } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
 164                 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
 165                                                     buf + 6))
 166                         reply_len = 1;
 167                 else
 168                         reply_len = 2;
 169         } else {
 170                 reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
 171                                                           &reply_len);
 172         }
 173
 174         if (reply) {
 175                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 176                        fromlen);
 177                 os_free(reply);
 178         } else if (reply_len == 1) {
 179                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 180                        fromlen);
 181         } else if (reply_len == 2) {
 182                 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
 183                        fromlen);
 184         }
 185
 186         if (new_attached)
 187                 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
 188 }
 189
 190
 191 static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 192 {
 193         char *buf;
 194         size_t len;
 195         char *pbuf, *dir = NULL, *gid_str = NULL;
 196         int res;
 197
 198         if (wpa_s->conf->ctrl_interface == NULL)
 199                 return NULL;
 200
 201         pbuf = os_strdup(wpa_s->conf->ctrl_interface);
 202         if (pbuf == NULL)
 203                 return NULL;
 204         if (os_strncmp(pbuf, "DIR=", 4) == 0) {
 205                 dir = pbuf + 4;
 206                 gid_str = os_strstr(dir, " GROUP=");
 207                 if (gid_str) {
 208                         *gid_str = '\0';
 209                         gid_str += 7;
 210                 }
 211         } else
 212                 dir = pbuf;
 213
 214         len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
 215         buf = os_malloc(len);
 216         if (buf == NULL) {
 217                 os_free(pbuf);
 218                 return NULL;
 219         }
 220
 221         res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
 222         if (res < 0 || (size_t) res >= len) {
 223                 os_free(pbuf);
 224                 os_free(buf);
 225                 return NULL;
 226         }
 227 #ifdef __CYGWIN__
 228         {
 229                 /* Windows/WinPcap uses interface names that are not suitable
 230                  * as a file name - convert invalid chars to underscores */
 231                 char *pos = buf;
 232                 while (*pos) {
 233                         if (*pos == '\\')
 234                                 *pos = '_';
 235                         pos++;
 236                 }
 237         }
 238 #endif /* __CYGWIN__ */
 239         os_free(pbuf);
 240         return buf;
 241 }
 242
 243
 244 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
 245                                              const char *txt, size_t len)
 246 {
 247         struct wpa_supplicant *wpa_s = ctx;
 248         if (wpa_s == NULL || wpa_s->ctrl_iface == NULL)
 249                 return;
 250         wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
 251 }
 252
 253
 254 struct ctrl_iface_priv *
 255 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 256 {
 257         struct ctrl_iface_priv *priv;
 258         struct sockaddr_un addr;
 259         char *fname = NULL;
 260         gid_t gid = 0;
 261         int gid_set = 0;
 262         char *buf, *dir = NULL, *gid_str = NULL;
 263         struct group *grp;
 264         char *endp;
 265
 266         priv = os_zalloc(sizeof(*priv));
 267         if (priv == NULL)
 268                 return NULL;
 269         dl_list_init(&priv->ctrl_dst);
 270         priv->wpa_s = wpa_s;
 271         priv->sock = -1;
 272
 273         if (wpa_s->conf->ctrl_interface == NULL)
 274                 return priv;
 275
 276         buf = os_strdup(wpa_s->conf->ctrl_interface);
 277         if (buf == NULL)
 278                 goto fail;
 279         if (os_strncmp(buf, "DIR=", 4) == 0) {
 280                 dir = buf + 4;
 281                 gid_str = os_strstr(dir, " GROUP=");
 282                 if (gid_str) {
 283                         *gid_str = '\0';
 284                         gid_str += 7;
 285                 }
 286         } else {
 287                 dir = buf;
 288                 gid_str = wpa_s->conf->ctrl_interface_group;
 289         }
 290
 291         if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
 292                 if (errno == EEXIST) {
 293                         wpa_printf(MSG_DEBUG, "Using existing control "
 294                                    "interface directory.");
 295                 } else {
 296                         perror("mkdir[ctrl_interface]");
 297                         goto fail;
 298                 }
 299         }
 300
 301         if (gid_str) {
 302                 grp = getgrnam(gid_str);
 303                 if (grp) {
 304                         gid = grp->gr_gid;
 305                         gid_set = 1;
 306                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
 307                                    " (from group name '%s')",
 308                                    (int) gid, gid_str);
 309                 } else {
 310                         /* Group name not found - try to parse this as gid */
 311                         gid = strtol(gid_str, &endp, 10);
 312                         if (*gid_str == '\0' || *endp != '\0') {
 313                                 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
 314                                            "'%s'", gid_str);
 315                                 goto fail;
 316                         }
 317                         gid_set = 1;
 318                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
 319                                    (int) gid);
 320                 }
 321         }
 322
 323         if (gid_set && chown(dir, -1, gid) < 0) {
 324                 perror("chown[ctrl_interface]");
 325                 goto fail;
 326         }
 327
 328         /* Make sure the group can enter and read the directory */
 329         if (gid_set &&
 330             chmod(dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP) < 0) {
 331                 wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
 332                            strerror(errno));
 333                 goto fail;
 334         }
 335
 336         if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
 337             sizeof(addr.sun_path)) {
 338                 wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
 339                 goto fail;
 340         }
 341
 342         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 343         if (priv->sock < 0) {
 344                 perror("socket(PF_UNIX)");
 345                 goto fail;
 346         }
 347
 348         os_memset(&addr, 0, sizeof(addr));
 349 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 350         addr.sun_len = sizeof(addr);
 351 #endif /* __FreeBSD__ */
 352         addr.sun_family = AF_UNIX;
 353         fname = wpa_supplicant_ctrl_iface_path(wpa_s);
 354         if (fname == NULL)
 355                 goto fail;
 356         os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
 357         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 358                 wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
 359                            strerror(errno));
 360                 if (connect(priv->sock, (struct sockaddr *) &addr,
 361                             sizeof(addr)) < 0) {
 362                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 363                                    " allow connections - assuming it was left"
 364                                    "over from forced program termination");
 365                         if (unlink(fname) < 0) {
 366                                 perror("unlink[ctrl_iface]");
 367                                 wpa_printf(MSG_ERROR, "Could not unlink "
 368                                            "existing ctrl_iface socket '%s'",
 369                                            fname);
 370                                 goto fail;
 371                         }
 372                         if (bind(priv->sock, (struct sockaddr *) &addr,
 373                                  sizeof(addr)) < 0) {
 374                                 perror("bind(PF_UNIX)");
 375                                 goto fail;
 376                         }
 377                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 378                                    "ctrl_iface socket '%s'", fname);
 379                 } else {
 380                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 381                                    "be in use - cannot override it");
 382                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 383                                    "not used anymore", fname);
 384                         os_free(fname);
 385                         fname = NULL;
 386                         goto fail;
 387                 }
 388         }
 389
 390         if (gid_set && chown(fname, -1, gid) < 0) {
 391                 perror("chown[ctrl_interface/ifname]");
 392                 goto fail;
 393         }
 394
 395         if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
 396                 perror("chmod[ctrl_interface/ifname]");
 397                 goto fail;
 398         }
 399         os_free(fname);
 400
 401         eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 402                                  wpa_s, priv);
 403         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 404
 405         os_free(buf);
 406         return priv;
 407
 408 fail:
 409         if (priv->sock >= 0)
 410                 close(priv->sock);
 411         os_free(priv);
 412         if (fname) {
 413                 unlink(fname);
 414                 os_free(fname);
 415         }
 416         os_free(buf);
 417         return NULL;
 418 }
 419
 420
 421 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 422 {
 423         struct wpa_ctrl_dst *dst, *prev;
 424
 425         if (priv->sock > -1) {
 426                 char *fname;
 427                 char *buf, *dir = NULL, *gid_str = NULL;
 428                 eloop_unregister_read_sock(priv->sock);
 429                 if (!dl_list_empty(&priv->ctrl_dst)) {
 430                         /*
 431                          * Wait a second before closing the control socket if
 432                          * there are any attached monitors in order to allow
 433                          * them to receive any pending messages.
 434                          */
 435                         wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 436                                    "monitors to receive messages");
 437                         os_sleep(1, 0);
 438                 }
 439                 close(priv->sock);
 440                 priv->sock = -1;
 441                 fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
 442                 if (fname) {
 443                         unlink(fname);
 444                         os_free(fname);
 445                 }
 446
 447                 buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
 448                 if (buf == NULL)
 449                         goto free_dst;
 450                 if (os_strncmp(buf, "DIR=", 4) == 0) {
 451                         dir = buf + 4;
 452                         gid_str = os_strstr(dir, " GROUP=");
 453                         if (gid_str) {
 454                                 *gid_str = '\0';
 455                                 gid_str += 7;
 456                         }
 457                 } else
 458                         dir = buf;
 459
 460                 if (rmdir(dir) < 0) {
 461                         if (errno == ENOTEMPTY) {
 462                                 wpa_printf(MSG_DEBUG, "Control interface "
 463                                            "directory not empty - leaving it "
 464                                            "behind");
 465                         } else {
 466                                 perror("rmdir[ctrl_interface]");
 467                         }
 468                 }
 469                 os_free(buf);
 470         }
 471
 472 free_dst:
 473         dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
 474                               list)
 475                 os_free(dst);
 476         os_free(priv);
 477 }
 478
 479
 480 /**
 481  * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
 482  * @priv: Pointer to private data from wpa_supplicant_ctrl_iface_init()
 483  * @level: Priority level of the message
 484  * @buf: Message data
 485  * @len: Message length
 486  *
 487  * Send a packet to all monitor programs attached to the control interface.
 488  */
 489 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
 490                                            int level, const char *buf,
 491                                            size_t len)
 492 {
 493         struct wpa_ctrl_dst *dst, *next;
 494         char levelstr[10];
 495         int idx, res;
 496         struct msghdr msg;
 497         struct iovec io[2];
 498
 499         if (priv->sock < 0 || dl_list_empty(&priv->ctrl_dst))
 500                 return;
 501
 502         res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 503         if (res < 0 || (size_t) res >= sizeof(levelstr))
 504                 return;
 505         io[0].iov_base = levelstr;
 506         io[0].iov_len = os_strlen(levelstr);
 507         io[1].iov_base = (char *) buf;
 508         io[1].iov_len = len;
 509         os_memset(&msg, 0, sizeof(msg));
 510         msg.msg_iov = io;
 511         msg.msg_iovlen = 2;
 512
 513         idx = 0;
 514         dl_list_for_each_safe(dst, next, &priv->ctrl_dst, struct wpa_ctrl_dst,
 515                               list) {
 516                 if (level >= dst->debug_level) {
 517                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
 518                                     (u8 *) dst->addr.sun_path, dst->addrlen -
 519                                     offsetof(struct sockaddr_un, sun_path));
 520                         msg.msg_name = (void *) &dst->addr;
 521                         msg.msg_namelen = dst->addrlen;
 522                         if (sendmsg(priv->sock, &msg, 0) < 0) {
 523                                 int _errno = errno;
 524                                 wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
 525                                            "%d - %s",
 526                                            idx, errno, strerror(errno));
 527                                 dst->errors++;
 528                                 if (dst->errors > 10 || _errno == ENOENT) {
 529                                         wpa_supplicant_ctrl_iface_detach(
 530                                                 priv, &dst->addr,
 531                                                 dst->addrlen);
 532                                 }
 533                         } else
 534                                 dst->errors = 0;
 535                 }
 536                 idx++;
 537         }
 538 }
 539
 540
 541 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 542 {
 543         char buf[256];
 544         int res;
 545         struct sockaddr_un from;
 546         socklen_t fromlen = sizeof(from);
 547
 548         for (;;) {
 549                 wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
 550                            "attach", priv->wpa_s->ifname);
 551                 eloop_wait_for_read_sock(priv->sock);
 552
 553                 res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
 554                                (struct sockaddr *) &from, &fromlen);
 555                 if (res < 0) {
 556                         perror("recvfrom(ctrl_iface)");
 557                         continue;
 558                 }
 559                 buf[res] = '\0';
 560
 561                 if (os_strcmp(buf, "ATTACH") == 0) {
 562                         /* handle ATTACH signal of first monitor interface */
 563                         if (!wpa_supplicant_ctrl_iface_attach(priv, &from,
 564                                                               fromlen)) {
 565                                 sendto(priv->sock, "OK\n", 3, 0,
 566                                        (struct sockaddr *) &from, fromlen);
 567                                 /* OK to continue */
 568                                 return;
 569                         } else {
 570                                 sendto(priv->sock, "FAIL\n", 5, 0,
 571                                        (struct sockaddr *) &from, fromlen);
 572                         }
 573                 } else {
 574                         /* return FAIL for all other signals */
 575                         sendto(priv->sock, "FAIL\n", 5, 0,
 576                                (struct sockaddr *) &from, fromlen);
 577                 }
 578         }
 579 }
 580
 581
 582 /* Global ctrl_iface */
 583
 584 struct ctrl_iface_global_priv {
 585         struct wpa_global *global;
 586         int sock;
 587 };
 588
 589
 590 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
 591                                                      void *sock_ctx)
 592 {
 593         struct wpa_global *global = eloop_ctx;
 594         char buf[256];
 595         int res;
 596         struct sockaddr_un from;
 597         socklen_t fromlen = sizeof(from);
 598         char *reply;
 599         size_t reply_len;
 600
 601         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 602                        (struct sockaddr *) &from, &fromlen);
 603         if (res < 0) {
 604                 perror("recvfrom(ctrl_iface)");
 605                 return;
 606         }
 607         buf[res] = '\0';
 608
 609         reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
 610                                                          &reply_len);
 611
 612         if (reply) {
 613                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 614                        fromlen);
 615                 os_free(reply);
 616         } else if (reply_len) {
 617                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 618                        fromlen);
 619         }
 620 }
 621
 622
 623 struct ctrl_iface_global_priv *
 624 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 625 {
 626         struct ctrl_iface_global_priv *priv;
 627         struct sockaddr_un addr;
 628
 629         priv = os_zalloc(sizeof(*priv));
 630         if (priv == NULL)
 631                 return NULL;
 632         priv->global = global;
 633         priv->sock = -1;
 634
 635         if (global->params.ctrl_interface == NULL)
 636                 return priv;
 637
 638         wpa_printf(MSG_DEBUG, "Global control interface '%s'",
 639                    global->params.ctrl_interface);
 640
 641         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 642         if (priv->sock < 0) {
 643                 perror("socket(PF_UNIX)");
 644                 goto fail;
 645         }
 646
 647         os_memset(&addr, 0, sizeof(addr));
 648 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 649         addr.sun_len = sizeof(addr);
 650 #endif /* __FreeBSD__ */
 651         addr.sun_family = AF_UNIX;
 652         os_strlcpy(addr.sun_path, global->params.ctrl_interface,
 653                    sizeof(addr.sun_path));
 654         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 655                 perror("bind(PF_UNIX)");
 656                 if (connect(priv->sock, (struct sockaddr *) &addr,
 657                             sizeof(addr)) < 0) {
 658                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 659                                    " allow connections - assuming it was left"
 660                                    "over from forced program termination");
 661                         if (unlink(global->params.ctrl_interface) < 0) {
 662                                 perror("unlink[ctrl_iface]");
 663                                 wpa_printf(MSG_ERROR, "Could not unlink "
 664                                            "existing ctrl_iface socket '%s'",
 665                                            global->params.ctrl_interface);
 666                                 goto fail;
 667                         }
 668                         if (bind(priv->sock, (struct sockaddr *) &addr,
 669                                  sizeof(addr)) < 0) {
 670                                 perror("bind(PF_UNIX)");
 671                                 goto fail;
 672                         }
 673                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 674                                    "ctrl_iface socket '%s'",
 675                                    global->params.ctrl_interface);
 676                 } else {
 677                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 678                                    "be in use - cannot override it");
 679                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 680                                    "not used anymore",
 681                                    global->params.ctrl_interface);
 682                         goto fail;
 683                 }
 684         }
 685
 686         eloop_register_read_sock(priv->sock,
 687                                  wpa_supplicant_global_ctrl_iface_receive,
 688                                  global, NULL);
 689
 690         return priv;
 691
 692 fail:
 693         if (priv->sock >= 0)
 694                 close(priv->sock);
 695         os_free(priv);
 696         return NULL;
 697 }
 698
 699
 700 void
 701 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
 702 {
 703         if (priv->sock >= 0) {
 704                 eloop_unregister_read_sock(priv->sock);
 705                 close(priv->sock);
 706         }
 707         if (priv->global->params.ctrl_interface)
 708                 unlink(priv->global->params.ctrl_interface);
 709         os_free(priv);
 710 }