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