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