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 software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10 #include <sys/un.h>
  11 #include <sys/stat.h>
  12 #include <grp.h>
  13 #include <stddef.h>
  14 #ifdef ANDROID
  15 #include <cutils/sockets.h>
  16 #endif /* ANDROID */
  17
  18 #include "utils/common.h"
  19 #include "utils/eloop.h"
  20 #include "utils/list.h"
  21 #include "eapol_supp/eapol_supp_sm.h"
  22 #include "config.h"
  23 #include "wpa_supplicant_i.h"
  24 #include "ctrl_iface.h"
  25
  26 /* Per-interface ctrl_iface */
  27
  28 /**
  29  * struct wpa_ctrl_dst - Internal data structure of control interface monitors
  30  *
  31  * This structure is used to store information about registered control
  32  * interface monitors into struct wpa_supplicant. This data is private to
  33  * ctrl_iface_unix.c and should not be touched directly from other files.
  34  */
  35 struct wpa_ctrl_dst {
  36         struct dl_list list;
  37         struct sockaddr_un addr;
  38         socklen_t addrlen;
  39         int debug_level;
  40         int errors;
  41 };
  42
  43
  44 struct ctrl_iface_priv {
  45         struct wpa_supplicant *wpa_s;
  46         int sock;
  47         struct dl_list ctrl_dst;
  48 };
  49
  50
  51 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
  52                                            int level, const char *buf,
  53                                            size_t len);
  54
  55
  56 static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
  57                                             struct sockaddr_un *from,
  58                                             socklen_t fromlen)
  59 {
  60         struct wpa_ctrl_dst *dst;
  61
  62         dst = os_zalloc(sizeof(*dst));
  63         if (dst == NULL)
  64                 return -1;
  65         os_memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
  66         dst->addrlen = fromlen;
  67         dst->debug_level = MSG_INFO;
  68         dl_list_add(&priv->ctrl_dst, &dst->list);
  69         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
  70                     (u8 *) from->sun_path,
  71                     fromlen - offsetof(struct sockaddr_un, sun_path));
  72         return 0;
  73 }
  74
  75
  76 static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
  77                                             struct sockaddr_un *from,
  78                                             socklen_t fromlen)
  79 {
  80         struct wpa_ctrl_dst *dst;
  81
  82         dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
  83                 if (fromlen == dst->addrlen &&
  84                     os_memcmp(from->sun_path, dst->addr.sun_path,
  85                               fromlen - offsetof(struct sockaddr_un, sun_path))
  86                     == 0) {
  87                         dl_list_del(&dst->list);
  88                         os_free(dst);
  89                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
  90                                     (u8 *) from->sun_path,
  91                                     fromlen -
  92                                     offsetof(struct sockaddr_un, sun_path));
  93                         return 0;
  94                 }
  95         }
  96         return -1;
  97 }
  98
  99
 100 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
 101                                            struct sockaddr_un *from,
 102                                            socklen_t fromlen,
 103                                            char *level)
 104 {
 105         struct wpa_ctrl_dst *dst;
 106
 107         wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
 108
 109         dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
 110                 if (fromlen == dst->addrlen &&
 111                     os_memcmp(from->sun_path, dst->addr.sun_path,
 112                               fromlen - offsetof(struct sockaddr_un, sun_path))
 113                     == 0) {
 114                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
 115                                     "level", (u8 *) from->sun_path,
 116                                     fromlen -
 117                                     offsetof(struct sockaddr_un, sun_path));
 118                         dst->debug_level = atoi(level);
 119                         return 0;
 120                 }
 121         }
 122
 123         return -1;
 124 }
 125
 126
 127 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
 128                                               void *sock_ctx)
 129 {
 130         struct wpa_supplicant *wpa_s = eloop_ctx;
 131         struct ctrl_iface_priv *priv = sock_ctx;
 132         char buf[4096];
 133         int res;
 134         struct sockaddr_un from;
 135         socklen_t fromlen = sizeof(from);
 136         char *reply = NULL;
 137         size_t reply_len = 0;
 138         int new_attached = 0;
 139
 140         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 141                        (struct sockaddr *) &from, &fromlen);
 142         if (res < 0) {
 143                 perror("recvfrom(ctrl_iface)");
 144                 return;
 145         }
 146         buf[res] = '\0';
 147
 148         if (os_strcmp(buf, "ATTACH") == 0) {
 149                 if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
 150                         reply_len = 1;
 151                 else {
 152                         new_attached = 1;
 153                         reply_len = 2;
 154                 }
 155         } else if (os_strcmp(buf, "DETACH") == 0) {
 156                 if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
 157                         reply_len = 1;
 158                 else
 159                         reply_len = 2;
 160         } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
 161                 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
 162                                                     buf + 6))
 163                         reply_len = 1;
 164                 else
 165                         reply_len = 2;
 166         } else {
 167                 reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
 168                                                           &reply_len);
 169         }
 170
 171         if (reply) {
 172                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 173                        fromlen);
 174                 os_free(reply);
 175         } else if (reply_len == 1) {
 176                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 177                        fromlen);
 178         } else if (reply_len == 2) {
 179                 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
 180                        fromlen);
 181         }
 182
 183         if (new_attached)
 184                 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
 185 }
 186
 187
 188 static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 189 {
 190         char *buf;
 191         size_t len;
 192         char *pbuf, *dir = NULL, *gid_str = NULL;
 193         int res;
 194
 195         if (wpa_s->conf->ctrl_interface == NULL)
 196                 return NULL;
 197
 198         pbuf = os_strdup(wpa_s->conf->ctrl_interface);
 199         if (pbuf == NULL)
 200                 return NULL;
 201         if (os_strncmp(pbuf, "DIR=", 4) == 0) {
 202                 dir = pbuf + 4;
 203                 gid_str = os_strstr(dir, " GROUP=");
 204                 if (gid_str) {
 205                         *gid_str = '\0';
 206                         gid_str += 7;
 207                 }
 208         } else
 209                 dir = pbuf;
 210
 211         len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
 212         buf = os_malloc(len);
 213         if (buf == NULL) {
 214                 os_free(pbuf);
 215                 return NULL;
 216         }
 217
 218         res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
 219         if (res < 0 || (size_t) res >= len) {
 220                 os_free(pbuf);
 221                 os_free(buf);
 222                 return NULL;
 223         }
 224 #ifdef __CYGWIN__
 225         {
 226                 /* Windows/WinPcap uses interface names that are not suitable
 227                  * as a file name - convert invalid chars to underscores */
 228                 char *pos = buf;
 229                 while (*pos) {
 230                         if (*pos == '\\')
 231                                 *pos = '_';
 232                         pos++;
 233                 }
 234         }
 235 #endif /* __CYGWIN__ */
 236         os_free(pbuf);
 237         return buf;
 238 }
 239
 240
 241 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
 242                                              const char *txt, size_t len)
 243 {
 244         struct wpa_supplicant *wpa_s = ctx;
 245         if (wpa_s == NULL || wpa_s->ctrl_iface == NULL)
 246                 return;
 247         wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
 248 }
 249
 250
 251 struct ctrl_iface_priv *
 252 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 253 {
 254         struct ctrl_iface_priv *priv;
 255         struct sockaddr_un addr;
 256         char *fname = NULL;
 257         gid_t gid = 0;
 258         int gid_set = 0;
 259         char *buf, *dir = NULL, *gid_str = NULL;
 260         struct group *grp;
 261         char *endp;
 262
 263         priv = os_zalloc(sizeof(*priv));
 264         if (priv == NULL)
 265                 return NULL;
 266         dl_list_init(&priv->ctrl_dst);
 267         priv->wpa_s = wpa_s;
 268         priv->sock = -1;
 269
 270         if (wpa_s->conf->ctrl_interface == NULL)
 271                 return priv;
 272
 273         buf = os_strdup(wpa_s->conf->ctrl_interface);
 274         if (buf == NULL)
 275                 goto fail;
 276 #ifdef ANDROID
 277         os_snprintf(addr.sun_path, sizeof(addr.sun_path), "wpa_%s",
 278                     wpa_s->conf->ctrl_interface);
 279         priv->sock = android_get_control_socket(addr.sun_path);
 280         if (priv->sock >= 0)
 281                 goto havesock;
 282 #endif /* ANDROID */
 283         if (os_strncmp(buf, "DIR=", 4) == 0) {
 284                 dir = buf + 4;
 285                 gid_str = os_strstr(dir, " GROUP=");
 286                 if (gid_str) {
 287                         *gid_str = '\0';
 288                         gid_str += 7;
 289                 }
 290         } else {
 291                 dir = buf;
 292                 gid_str = wpa_s->conf->ctrl_interface_group;
 293         }
 294
 295         if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
 296                 if (errno == EEXIST) {
 297                         wpa_printf(MSG_DEBUG, "Using existing control "
 298                                    "interface directory.");
 299                 } else {
 300                         perror("mkdir[ctrl_interface]");
 301                         goto fail;
 302                 }
 303         }
 304
 305         if (gid_str) {
 306                 grp = getgrnam(gid_str);
 307                 if (grp) {
 308                         gid = grp->gr_gid;
 309                         gid_set = 1;
 310                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
 311                                    " (from group name '%s')",
 312                                    (int) gid, gid_str);
 313                 } else {
 314                         /* Group name not found - try to parse this as gid */
 315                         gid = strtol(gid_str, &endp, 10);
 316                         if (*gid_str == '\0' || *endp != '\0') {
 317                                 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
 318                                            "'%s'", gid_str);
 319                                 goto fail;
 320                         }
 321                         gid_set = 1;
 322                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
 323                                    (int) gid);
 324                 }
 325         }
 326
 327         if (gid_set && chown(dir, -1, gid) < 0) {
 328                 perror("chown[ctrl_interface]");
 329                 goto fail;
 330         }
 331
 332         /* Make sure the group can enter and read the directory */
 333         if (gid_set &&
 334             chmod(dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP) < 0) {
 335                 wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
 336                            strerror(errno));
 337                 goto fail;
 338         }
 339
 340         if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
 341             sizeof(addr.sun_path)) {
 342                 wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
 343                 goto fail;
 344         }
 345
 346         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 347         if (priv->sock < 0) {
 348                 perror("socket(PF_UNIX)");
 349                 goto fail;
 350         }
 351
 352         os_memset(&addr, 0, sizeof(addr));
 353 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 354         addr.sun_len = sizeof(addr);
 355 #endif /* __FreeBSD__ */
 356         addr.sun_family = AF_UNIX;
 357         fname = wpa_supplicant_ctrl_iface_path(wpa_s);
 358         if (fname == NULL)
 359                 goto fail;
 360         os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
 361         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 362                 wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
 363                            strerror(errno));
 364                 if (connect(priv->sock, (struct sockaddr *) &addr,
 365                             sizeof(addr)) < 0) {
 366                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 367                                    " allow connections - assuming it was left"
 368                                    "over from forced program termination");
 369                         if (unlink(fname) < 0) {
 370                                 perror("unlink[ctrl_iface]");
 371                                 wpa_printf(MSG_ERROR, "Could not unlink "
 372                                            "existing ctrl_iface socket '%s'",
 373                                            fname);
 374                                 goto fail;
 375                         }
 376                         if (bind(priv->sock, (struct sockaddr *) &addr,
 377                                  sizeof(addr)) < 0) {
 378                                 perror("supp-ctrl-iface-init: bind(PF_UNIX)");
 379                                 goto fail;
 380                         }
 381                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 382                                    "ctrl_iface socket '%s'", fname);
 383                 } else {
 384                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 385                                    "be in use - cannot override it");
 386                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 387                                    "not used anymore", fname);
 388                         os_free(fname);
 389                         fname = NULL;
 390                         goto fail;
 391                 }
 392         }
 393
 394         if (gid_set && chown(fname, -1, gid) < 0) {
 395                 perror("chown[ctrl_interface/ifname]");
 396                 goto fail;
 397         }
 398
 399         if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
 400                 perror("chmod[ctrl_interface/ifname]");
 401                 goto fail;
 402         }
 403         os_free(fname);
 404
 405 #ifdef ANDROID
 406 havesock:
 407 #endif /* ANDROID */
 408         eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 409                                  wpa_s, priv);
 410         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 411
 412         os_free(buf);
 413         return priv;
 414
 415 fail:
 416         if (priv->sock >= 0)
 417                 close(priv->sock);
 418         os_free(priv);
 419         if (fname) {
 420                 unlink(fname);
 421                 os_free(fname);
 422         }
 423         os_free(buf);
 424         return NULL;
 425 }
 426
 427
 428 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 429 {
 430         struct wpa_ctrl_dst *dst, *prev;
 431
 432         if (priv->sock > -1) {
 433                 char *fname;
 434                 char *buf, *dir = NULL, *gid_str = NULL;
 435                 eloop_unregister_read_sock(priv->sock);
 436                 if (!dl_list_empty(&priv->ctrl_dst)) {
 437                         /*
 438                          * Wait a second before closing the control socket if
 439                          * there are any attached monitors in order to allow
 440                          * them to receive any pending messages.
 441                          */
 442                         wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 443                                    "monitors to receive messages");
 444                         os_sleep(1, 0);
 445                 }
 446                 close(priv->sock);
 447                 priv->sock = -1;
 448                 fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
 449                 if (fname) {
 450                         unlink(fname);
 451                         os_free(fname);
 452                 }
 453
 454                 buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
 455                 if (buf == NULL)
 456                         goto free_dst;
 457                 if (os_strncmp(buf, "DIR=", 4) == 0) {
 458                         dir = buf + 4;
 459                         gid_str = os_strstr(dir, " GROUP=");
 460                         if (gid_str) {
 461                                 *gid_str = '\0';
 462                                 gid_str += 7;
 463                         }
 464                 } else
 465                         dir = buf;
 466
 467                 if (rmdir(dir) < 0) {
 468                         if (errno == ENOTEMPTY) {
 469                                 wpa_printf(MSG_DEBUG, "Control interface "
 470                                            "directory not empty - leaving it "
 471                                            "behind");
 472                         } else {
 473                                 perror("rmdir[ctrl_interface]");
 474                         }
 475                 }
 476                 os_free(buf);
 477         }
 478
 479 free_dst:
 480         dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
 481                               list)
 482                 os_free(dst);
 483         os_free(priv);
 484 }
 485
 486
 487 /**
 488  * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
 489  * @priv: Pointer to private data from wpa_supplicant_ctrl_iface_init()
 490  * @level: Priority level of the message
 491  * @buf: Message data
 492  * @len: Message length
 493  *
 494  * Send a packet to all monitor programs attached to the control interface.
 495  */
 496 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
 497                                            int level, const char *buf,
 498                                            size_t len)
 499 {
 500         struct wpa_ctrl_dst *dst, *next;
 501         char levelstr[10];
 502         int idx, res;
 503         struct msghdr msg;
 504         struct iovec io[2];
 505
 506         if (priv->sock < 0 || dl_list_empty(&priv->ctrl_dst))
 507                 return;
 508
 509         res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 510         if (res < 0 || (size_t) res >= sizeof(levelstr))
 511                 return;
 512         io[0].iov_base = levelstr;
 513         io[0].iov_len = os_strlen(levelstr);
 514         io[1].iov_base = (char *) buf;
 515         io[1].iov_len = len;
 516         os_memset(&msg, 0, sizeof(msg));
 517         msg.msg_iov = io;
 518         msg.msg_iovlen = 2;
 519
 520         idx = 0;
 521         dl_list_for_each_safe(dst, next, &priv->ctrl_dst, struct wpa_ctrl_dst,
 522                               list) {
 523                 if (level >= dst->debug_level) {
 524                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
 525                                     (u8 *) dst->addr.sun_path, dst->addrlen -
 526                                     offsetof(struct sockaddr_un, sun_path));
 527                         msg.msg_name = (void *) &dst->addr;
 528                         msg.msg_namelen = dst->addrlen;
 529                         if (sendmsg(priv->sock, &msg, 0) < 0) {
 530                                 int _errno = errno;
 531                                 wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
 532                                            "%d - %s",
 533                                            idx, errno, strerror(errno));
 534                                 dst->errors++;
 535                                 if (dst->errors > 1000 ||
 536                                     (_errno != ENOBUFS && dst->errors > 10) ||
 537                                     _errno == ENOENT) {
 538                                         wpa_supplicant_ctrl_iface_detach(
 539                                                 priv, &dst->addr,
 540                                                 dst->addrlen);
 541                                 }
 542                         } else
 543                                 dst->errors = 0;
 544                 }
 545                 idx++;
 546         }
 547 }
 548
 549
 550 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 551 {
 552         char buf[256];
 553         int res;
 554         struct sockaddr_un from;
 555         socklen_t fromlen = sizeof(from);
 556
 557         for (;;) {
 558                 wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
 559                            "attach", priv->wpa_s->ifname);
 560                 eloop_wait_for_read_sock(priv->sock);
 561
 562                 res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
 563                                (struct sockaddr *) &from, &fromlen);
 564                 if (res < 0) {
 565                         perror("recvfrom(ctrl_iface)");
 566                         continue;
 567                 }
 568                 buf[res] = '\0';
 569
 570                 if (os_strcmp(buf, "ATTACH") == 0) {
 571                         /* handle ATTACH signal of first monitor interface */
 572                         if (!wpa_supplicant_ctrl_iface_attach(priv, &from,
 573                                                               fromlen)) {
 574                                 sendto(priv->sock, "OK\n", 3, 0,
 575                                        (struct sockaddr *) &from, fromlen);
 576                                 /* OK to continue */
 577                                 return;
 578                         } else {
 579                                 sendto(priv->sock, "FAIL\n", 5, 0,
 580                                        (struct sockaddr *) &from, fromlen);
 581                         }
 582                 } else {
 583                         /* return FAIL for all other signals */
 584                         sendto(priv->sock, "FAIL\n", 5, 0,
 585                                (struct sockaddr *) &from, fromlen);
 586                 }
 587         }
 588 }
 589
 590
 591 /* Global ctrl_iface */
 592
 593 struct ctrl_iface_global_priv {
 594         struct wpa_global *global;
 595         int sock;
 596 };
 597
 598
 599 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
 600                                                      void *sock_ctx)
 601 {
 602         struct wpa_global *global = eloop_ctx;
 603         char buf[256];
 604         int res;
 605         struct sockaddr_un from;
 606         socklen_t fromlen = sizeof(from);
 607         char *reply;
 608         size_t reply_len;
 609
 610         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 611                        (struct sockaddr *) &from, &fromlen);
 612         if (res < 0) {
 613                 perror("recvfrom(ctrl_iface)");
 614                 return;
 615         }
 616         buf[res] = '\0';
 617
 618         reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
 619                                                          &reply_len);
 620
 621         if (reply) {
 622                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 623                        fromlen);
 624                 os_free(reply);
 625         } else if (reply_len) {
 626                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 627                        fromlen);
 628         }
 629 }
 630
 631
 632 struct ctrl_iface_global_priv *
 633 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 634 {
 635         struct ctrl_iface_global_priv *priv;
 636         struct sockaddr_un addr;
 637
 638         priv = os_zalloc(sizeof(*priv));
 639         if (priv == NULL)
 640                 return NULL;
 641         priv->global = global;
 642         priv->sock = -1;
 643
 644         if (global->params.ctrl_interface == NULL)
 645                 return priv;
 646
 647 #ifdef ANDROID
 648         priv->sock = android_get_control_socket(global->params.ctrl_interface);
 649         if (priv->sock >= 0)
 650                 goto havesock;
 651 #endif /* ANDROID */
 652
 653         wpa_printf(MSG_DEBUG, "Global control interface '%s'",
 654                    global->params.ctrl_interface);
 655
 656         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 657         if (priv->sock < 0) {
 658                 perror("socket(PF_UNIX)");
 659                 goto fail;
 660         }
 661
 662         os_memset(&addr, 0, sizeof(addr));
 663 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 664         addr.sun_len = sizeof(addr);
 665 #endif /* __FreeBSD__ */
 666         addr.sun_family = AF_UNIX;
 667         os_strlcpy(addr.sun_path, global->params.ctrl_interface,
 668                    sizeof(addr.sun_path));
 669         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 670                 perror("supp-global-ctrl-iface-init (will try fixup): "
 671                        "bind(PF_UNIX)");
 672                 if (connect(priv->sock, (struct sockaddr *) &addr,
 673                             sizeof(addr)) < 0) {
 674                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 675                                    " allow connections - assuming it was left"
 676                                    "over from forced program termination");
 677                         if (unlink(global->params.ctrl_interface) < 0) {
 678                                 perror("unlink[ctrl_iface]");
 679                                 wpa_printf(MSG_ERROR, "Could not unlink "
 680                                            "existing ctrl_iface socket '%s'",
 681                                            global->params.ctrl_interface);
 682                                 goto fail;
 683                         }
 684                         if (bind(priv->sock, (struct sockaddr *) &addr,
 685                                  sizeof(addr)) < 0) {
 686                                 perror("supp-glb-iface-init: bind(PF_UNIX)");
 687                                 goto fail;
 688                         }
 689                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 690                                    "ctrl_iface socket '%s'",
 691                                    global->params.ctrl_interface);
 692                 } else {
 693                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 694                                    "be in use - cannot override it");
 695                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 696                                    "not used anymore",
 697                                    global->params.ctrl_interface);
 698                         goto fail;
 699                 }
 700         }
 701
 702 #ifdef ANDROID
 703 havesock:
 704 #endif /* ANDROID */
 705         eloop_register_read_sock(priv->sock,
 706                                  wpa_supplicant_global_ctrl_iface_receive,
 707                                  global, NULL);
 708
 709         return priv;
 710
 711 fail:
 712         if (priv->sock >= 0)
 713                 close(priv->sock);
 714         os_free(priv);
 715         return NULL;
 716 }
 717
 718
 719 void
 720 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
 721 {
 722         if (priv->sock >= 0) {
 723                 eloop_unregister_read_sock(priv->sock);
 724                 close(priv->sock);
 725         }
 726         if (priv->global->params.ctrl_interface)
 727                 unlink(priv->global->params.ctrl_interface);
 728         os_free(priv);
 729 }