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 #ifdef ANDROID
  21 #include <cutils/sockets.h>
  22 #endif /* ANDROID */
  23
  24 #include "utils/common.h"
  25 #include "utils/eloop.h"
  26 #include "utils/list.h"
  27 #include "eapol_supp/eapol_supp_sm.h"
  28 #include "config.h"
  29 #include "wpa_supplicant_i.h"
  30 #include "ctrl_iface.h"
  31
  32 /* Per-interface ctrl_iface */
  33
  34 /**
  35  * struct wpa_ctrl_dst - Internal data structure of control interface monitors
  36  *
  37  * This structure is used to store information about registered control
  38  * interface monitors into struct wpa_supplicant. This data is private to
  39  * ctrl_iface_unix.c and should not be touched directly from other files.
  40  */
  41 struct wpa_ctrl_dst {
  42         struct dl_list list;
  43         struct sockaddr_un addr;
  44         socklen_t addrlen;
  45         int debug_level;
  46         int errors;
  47 };
  48
  49
  50 struct ctrl_iface_priv {
  51         struct wpa_supplicant *wpa_s;
  52         int sock;
  53         struct dl_list ctrl_dst;
  54 };
  55
  56
  57 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
  58                                            int level, const char *buf,
  59                                            size_t len);
  60
  61
  62 static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
  63                                             struct sockaddr_un *from,
  64                                             socklen_t fromlen)
  65 {
  66         struct wpa_ctrl_dst *dst;
  67
  68         dst = os_zalloc(sizeof(*dst));
  69         if (dst == NULL)
  70                 return -1;
  71         os_memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
  72         dst->addrlen = fromlen;
  73         dst->debug_level = MSG_INFO;
  74         dl_list_add(&priv->ctrl_dst, &dst->list);
  75         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
  76                     (u8 *) from->sun_path,
  77                     fromlen - offsetof(struct sockaddr_un, sun_path));
  78         return 0;
  79 }
  80
  81
  82 static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
  83                                             struct sockaddr_un *from,
  84                                             socklen_t fromlen)
  85 {
  86         struct wpa_ctrl_dst *dst;
  87
  88         dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
  89                 if (fromlen == dst->addrlen &&
  90                     os_memcmp(from->sun_path, dst->addr.sun_path,
  91                               fromlen - offsetof(struct sockaddr_un, sun_path))
  92                     == 0) {
  93                         dl_list_del(&dst->list);
  94                         os_free(dst);
  95                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
  96                                     (u8 *) from->sun_path,
  97                                     fromlen -
  98                                     offsetof(struct sockaddr_un, sun_path));
  99                         return 0;
 100                 }
 101         }
 102         return -1;
 103 }
 104
 105
 106 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
 107                                            struct sockaddr_un *from,
 108                                            socklen_t fromlen,
 109                                            char *level)
 110 {
 111         struct wpa_ctrl_dst *dst;
 112
 113         wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
 114
 115         dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
 116                 if (fromlen == dst->addrlen &&
 117                     os_memcmp(from->sun_path, dst->addr.sun_path,
 118                               fromlen - offsetof(struct sockaddr_un, sun_path))
 119                     == 0) {
 120                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
 121                                     "level", (u8 *) from->sun_path,
 122                                     fromlen -
 123                                     offsetof(struct sockaddr_un, sun_path));
 124                         dst->debug_level = atoi(level);
 125                         return 0;
 126                 }
 127         }
 128
 129         return -1;
 130 }
 131
 132
 133 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
 134                                               void *sock_ctx)
 135 {
 136         struct wpa_supplicant *wpa_s = eloop_ctx;
 137         struct ctrl_iface_priv *priv = sock_ctx;
 138         char buf[4096];
 139         int res;
 140         struct sockaddr_un from;
 141         socklen_t fromlen = sizeof(from);
 142         char *reply = NULL;
 143         size_t reply_len = 0;
 144         int new_attached = 0;
 145
 146         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 147                        (struct sockaddr *) &from, &fromlen);
 148         if (res < 0) {
 149                 perror("recvfrom(ctrl_iface)");
 150                 return;
 151         }
 152         buf[res] = '\0';
 153
 154         if (os_strcmp(buf, "ATTACH") == 0) {
 155                 if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
 156                         reply_len = 1;
 157                 else {
 158                         new_attached = 1;
 159                         reply_len = 2;
 160                 }
 161         } else if (os_strcmp(buf, "DETACH") == 0) {
 162                 if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
 163                         reply_len = 1;
 164                 else
 165                         reply_len = 2;
 166         } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
 167                 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
 168                                                     buf + 6))
 169                         reply_len = 1;
 170                 else
 171                         reply_len = 2;
 172         } else {
 173                 reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
 174                                                           &reply_len);
 175         }
 176
 177         if (reply) {
 178                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 179                        fromlen);
 180                 os_free(reply);
 181         } else if (reply_len == 1) {
 182                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 183                        fromlen);
 184         } else if (reply_len == 2) {
 185                 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
 186                        fromlen);
 187         }
 188
 189         if (new_attached)
 190                 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
 191 }
 192
 193
 194 static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 195 {
 196         char *buf;
 197         size_t len;
 198         char *pbuf, *dir = NULL, *gid_str = NULL;
 199         int res;
 200
 201         if (wpa_s->conf->ctrl_interface == NULL)
 202                 return NULL;
 203
 204         pbuf = os_strdup(wpa_s->conf->ctrl_interface);
 205         if (pbuf == NULL)
 206                 return NULL;
 207         if (os_strncmp(pbuf, "DIR=", 4) == 0) {
 208                 dir = pbuf + 4;
 209                 gid_str = os_strstr(dir, " GROUP=");
 210                 if (gid_str) {
 211                         *gid_str = '\0';
 212                         gid_str += 7;
 213                 }
 214         } else
 215                 dir = pbuf;
 216
 217         len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
 218         buf = os_malloc(len);
 219         if (buf == NULL) {
 220                 os_free(pbuf);
 221                 return NULL;
 222         }
 223
 224         res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
 225         if (res < 0 || (size_t) res >= len) {
 226                 os_free(pbuf);
 227                 os_free(buf);
 228                 return NULL;
 229         }
 230 #ifdef __CYGWIN__
 231         {
 232                 /* Windows/WinPcap uses interface names that are not suitable
 233                  * as a file name - convert invalid chars to underscores */
 234                 char *pos = buf;
 235                 while (*pos) {
 236                         if (*pos == '\\')
 237                                 *pos = '_';
 238                         pos++;
 239                 }
 240         }
 241 #endif /* __CYGWIN__ */
 242         os_free(pbuf);
 243         return buf;
 244 }
 245
 246
 247 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
 248                                              const char *txt, size_t len)
 249 {
 250         struct wpa_supplicant *wpa_s = ctx;
 251         if (wpa_s == NULL || wpa_s->ctrl_iface == NULL)
 252                 return;
 253         wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
 254 }
 255
 256
 257 struct ctrl_iface_priv *
 258 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 259 {
 260         struct ctrl_iface_priv *priv;
 261         struct sockaddr_un addr;
 262         char *fname = NULL;
 263         gid_t gid = 0;
 264         int gid_set = 0;
 265         char *buf, *dir = NULL, *gid_str = NULL;
 266         struct group *grp;
 267         char *endp;
 268
 269         priv = os_zalloc(sizeof(*priv));
 270         if (priv == NULL)
 271                 return NULL;
 272         dl_list_init(&priv->ctrl_dst);
 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 #ifdef ANDROID
 283         os_snprintf(addr.sun_path, sizeof(addr.sun_path), "wpa_%s",
 284                     wpa_s->conf->ctrl_interface);
 285         priv->sock = android_get_control_socket(addr.sun_path);
 286         if (priv->sock >= 0)
 287                 goto havesock;
 288 #endif /* ANDROID */
 289         if (os_strncmp(buf, "DIR=", 4) == 0) {
 290                 dir = buf + 4;
 291                 gid_str = os_strstr(dir, " GROUP=");
 292                 if (gid_str) {
 293                         *gid_str = '\0';
 294                         gid_str += 7;
 295                 }
 296         } else {
 297                 dir = buf;
 298                 gid_str = wpa_s->conf->ctrl_interface_group;
 299         }
 300
 301         if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
 302                 if (errno == EEXIST) {
 303                         wpa_printf(MSG_DEBUG, "Using existing control "
 304                                    "interface directory.");
 305                 } else {
 306                         perror("mkdir[ctrl_interface]");
 307                         goto fail;
 308                 }
 309         }
 310
 311         if (gid_str) {
 312                 grp = getgrnam(gid_str);
 313                 if (grp) {
 314                         gid = grp->gr_gid;
 315                         gid_set = 1;
 316                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
 317                                    " (from group name '%s')",
 318                                    (int) gid, gid_str);
 319                 } else {
 320                         /* Group name not found - try to parse this as gid */
 321                         gid = strtol(gid_str, &endp, 10);
 322                         if (*gid_str == '\0' || *endp != '\0') {
 323                                 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
 324                                            "'%s'", gid_str);
 325                                 goto fail;
 326                         }
 327                         gid_set = 1;
 328                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
 329                                    (int) gid);
 330                 }
 331         }
 332
 333         if (gid_set && chown(dir, -1, gid) < 0) {
 334                 perror("chown[ctrl_interface]");
 335                 goto fail;
 336         }
 337
 338         /* Make sure the group can enter and read the directory */
 339         if (gid_set &&
 340             chmod(dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP) < 0) {
 341                 wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
 342                            strerror(errno));
 343                 goto fail;
 344         }
 345
 346         if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
 347             sizeof(addr.sun_path)) {
 348                 wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
 349                 goto fail;
 350         }
 351
 352         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 353         if (priv->sock < 0) {
 354                 perror("socket(PF_UNIX)");
 355                 goto fail;
 356         }
 357
 358         os_memset(&addr, 0, sizeof(addr));
 359 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 360         addr.sun_len = sizeof(addr);
 361 #endif /* __FreeBSD__ */
 362         addr.sun_family = AF_UNIX;
 363         fname = wpa_supplicant_ctrl_iface_path(wpa_s);
 364         if (fname == NULL)
 365                 goto fail;
 366         os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
 367         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 368                 wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
 369                            strerror(errno));
 370                 if (connect(priv->sock, (struct sockaddr *) &addr,
 371                             sizeof(addr)) < 0) {
 372                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 373                                    " allow connections - assuming it was left"
 374                                    "over from forced program termination");
 375                         if (unlink(fname) < 0) {
 376                                 perror("unlink[ctrl_iface]");
 377                                 wpa_printf(MSG_ERROR, "Could not unlink "
 378                                            "existing ctrl_iface socket '%s'",
 379                                            fname);
 380                                 goto fail;
 381                         }
 382                         if (bind(priv->sock, (struct sockaddr *) &addr,
 383                                  sizeof(addr)) < 0) {
 384                                 perror("bind(PF_UNIX)");
 385                                 goto fail;
 386                         }
 387                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 388                                    "ctrl_iface socket '%s'", fname);
 389                 } else {
 390                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 391                                    "be in use - cannot override it");
 392                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 393                                    "not used anymore", fname);
 394                         os_free(fname);
 395                         fname = NULL;
 396                         goto fail;
 397                 }
 398         }
 399
 400         if (gid_set && chown(fname, -1, gid) < 0) {
 401                 perror("chown[ctrl_interface/ifname]");
 402                 goto fail;
 403         }
 404
 405         if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
 406                 perror("chmod[ctrl_interface/ifname]");
 407                 goto fail;
 408         }
 409         os_free(fname);
 410
 411 #ifdef ANDROID
 412 havesock:
 413 #endif /* ANDROID */
 414         eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 415                                  wpa_s, priv);
 416         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 417
 418         os_free(buf);
 419         return priv;
 420
 421 fail:
 422         if (priv->sock >= 0)
 423                 close(priv->sock);
 424         os_free(priv);
 425         if (fname) {
 426                 unlink(fname);
 427                 os_free(fname);
 428         }
 429         os_free(buf);
 430         return NULL;
 431 }
 432
 433
 434 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 435 {
 436         struct wpa_ctrl_dst *dst, *prev;
 437
 438         if (priv->sock > -1) {
 439                 char *fname;
 440                 char *buf, *dir = NULL, *gid_str = NULL;
 441                 eloop_unregister_read_sock(priv->sock);
 442                 if (!dl_list_empty(&priv->ctrl_dst)) {
 443                         /*
 444                          * Wait a second before closing the control socket if
 445                          * there are any attached monitors in order to allow
 446                          * them to receive any pending messages.
 447                          */
 448                         wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 449                                    "monitors to receive messages");
 450                         os_sleep(1, 0);
 451                 }
 452                 close(priv->sock);
 453                 priv->sock = -1;
 454                 fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
 455                 if (fname) {
 456                         unlink(fname);
 457                         os_free(fname);
 458                 }
 459
 460                 buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
 461                 if (buf == NULL)
 462                         goto free_dst;
 463                 if (os_strncmp(buf, "DIR=", 4) == 0) {
 464                         dir = buf + 4;
 465                         gid_str = os_strstr(dir, " GROUP=");
 466                         if (gid_str) {
 467                                 *gid_str = '\0';
 468                                 gid_str += 7;
 469                         }
 470                 } else
 471                         dir = buf;
 472
 473                 if (rmdir(dir) < 0) {
 474                         if (errno == ENOTEMPTY) {
 475                                 wpa_printf(MSG_DEBUG, "Control interface "
 476                                            "directory not empty - leaving it "
 477                                            "behind");
 478                         } else {
 479                                 perror("rmdir[ctrl_interface]");
 480                         }
 481                 }
 482                 os_free(buf);
 483         }
 484
 485 free_dst:
 486         dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
 487                               list)
 488                 os_free(dst);
 489         os_free(priv);
 490 }
 491
 492
 493 /**
 494  * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
 495  * @priv: Pointer to private data from wpa_supplicant_ctrl_iface_init()
 496  * @level: Priority level of the message
 497  * @buf: Message data
 498  * @len: Message length
 499  *
 500  * Send a packet to all monitor programs attached to the control interface.
 501  */
 502 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
 503                                            int level, const char *buf,
 504                                            size_t len)
 505 {
 506         struct wpa_ctrl_dst *dst, *next;
 507         char levelstr[10];
 508         int idx, res;
 509         struct msghdr msg;
 510         struct iovec io[2];
 511
 512         if (priv->sock < 0 || dl_list_empty(&priv->ctrl_dst))
 513                 return;
 514
 515         res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 516         if (res < 0 || (size_t) res >= sizeof(levelstr))
 517                 return;
 518         io[0].iov_base = levelstr;
 519         io[0].iov_len = os_strlen(levelstr);
 520         io[1].iov_base = (char *) buf;
 521         io[1].iov_len = len;
 522         os_memset(&msg, 0, sizeof(msg));
 523         msg.msg_iov = io;
 524         msg.msg_iovlen = 2;
 525
 526         idx = 0;
 527         dl_list_for_each_safe(dst, next, &priv->ctrl_dst, struct wpa_ctrl_dst,
 528                               list) {
 529                 if (level >= dst->debug_level) {
 530                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
 531                                     (u8 *) dst->addr.sun_path, dst->addrlen -
 532                                     offsetof(struct sockaddr_un, sun_path));
 533                         msg.msg_name = (void *) &dst->addr;
 534                         msg.msg_namelen = dst->addrlen;
 535                         if (sendmsg(priv->sock, &msg, 0) < 0) {
 536                                 int _errno = errno;
 537                                 wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
 538                                            "%d - %s",
 539                                            idx, errno, strerror(errno));
 540                                 dst->errors++;
 541                                 if (dst->errors > 1000 ||
 542                                     (_errno != ENOBUFS && dst->errors > 10) ||
 543                                     _errno == ENOENT) {
 544                                         wpa_supplicant_ctrl_iface_detach(
 545                                                 priv, &dst->addr,
 546                                                 dst->addrlen);
 547                                 }
 548                         } else
 549                                 dst->errors = 0;
 550                 }
 551                 idx++;
 552         }
 553 }
 554
 555
 556 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 557 {
 558         char buf[256];
 559         int res;
 560         struct sockaddr_un from;
 561         socklen_t fromlen = sizeof(from);
 562
 563         for (;;) {
 564                 wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
 565                            "attach", priv->wpa_s->ifname);
 566                 eloop_wait_for_read_sock(priv->sock);
 567
 568                 res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
 569                                (struct sockaddr *) &from, &fromlen);
 570                 if (res < 0) {
 571                         perror("recvfrom(ctrl_iface)");
 572                         continue;
 573                 }
 574                 buf[res] = '\0';
 575
 576                 if (os_strcmp(buf, "ATTACH") == 0) {
 577                         /* handle ATTACH signal of first monitor interface */
 578                         if (!wpa_supplicant_ctrl_iface_attach(priv, &from,
 579                                                               fromlen)) {
 580                                 sendto(priv->sock, "OK\n", 3, 0,
 581                                        (struct sockaddr *) &from, fromlen);
 582                                 /* OK to continue */
 583                                 return;
 584                         } else {
 585                                 sendto(priv->sock, "FAIL\n", 5, 0,
 586                                        (struct sockaddr *) &from, fromlen);
 587                         }
 588                 } else {
 589                         /* return FAIL for all other signals */
 590                         sendto(priv->sock, "FAIL\n", 5, 0,
 591                                (struct sockaddr *) &from, fromlen);
 592                 }
 593         }
 594 }
 595
 596
 597 /* Global ctrl_iface */
 598
 599 struct ctrl_iface_global_priv {
 600         struct wpa_global *global;
 601         int sock;
 602 };
 603
 604
 605 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
 606                                                      void *sock_ctx)
 607 {
 608         struct wpa_global *global = eloop_ctx;
 609         char buf[256];
 610         int res;
 611         struct sockaddr_un from;
 612         socklen_t fromlen = sizeof(from);
 613         char *reply;
 614         size_t reply_len;
 615
 616         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 617                        (struct sockaddr *) &from, &fromlen);
 618         if (res < 0) {
 619                 perror("recvfrom(ctrl_iface)");
 620                 return;
 621         }
 622         buf[res] = '\0';
 623
 624         reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
 625                                                          &reply_len);
 626
 627         if (reply) {
 628                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 629                        fromlen);
 630                 os_free(reply);
 631         } else if (reply_len) {
 632                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 633                        fromlen);
 634         }
 635 }
 636
 637
 638 struct ctrl_iface_global_priv *
 639 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 640 {
 641         struct ctrl_iface_global_priv *priv;
 642         struct sockaddr_un addr;
 643
 644         priv = os_zalloc(sizeof(*priv));
 645         if (priv == NULL)
 646                 return NULL;
 647         priv->global = global;
 648         priv->sock = -1;
 649
 650         if (global->params.ctrl_interface == NULL)
 651                 return priv;
 652
 653 #ifdef ANDROID
 654         priv->sock = android_get_control_socket(global->params.ctrl_interface);
 655         if (priv->sock >= 0)
 656                 goto havesock;
 657 #endif /* ANDROID */
 658
 659         wpa_printf(MSG_DEBUG, "Global control interface '%s'",
 660                    global->params.ctrl_interface);
 661
 662         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 663         if (priv->sock < 0) {
 664                 perror("socket(PF_UNIX)");
 665                 goto fail;
 666         }
 667
 668         os_memset(&addr, 0, sizeof(addr));
 669 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 670         addr.sun_len = sizeof(addr);
 671 #endif /* __FreeBSD__ */
 672         addr.sun_family = AF_UNIX;
 673         os_strlcpy(addr.sun_path, global->params.ctrl_interface,
 674                    sizeof(addr.sun_path));
 675         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 676                 perror("bind(PF_UNIX)");
 677                 if (connect(priv->sock, (struct sockaddr *) &addr,
 678                             sizeof(addr)) < 0) {
 679                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 680                                    " allow connections - assuming it was left"
 681                                    "over from forced program termination");
 682                         if (unlink(global->params.ctrl_interface) < 0) {
 683                                 perror("unlink[ctrl_iface]");
 684                                 wpa_printf(MSG_ERROR, "Could not unlink "
 685                                            "existing ctrl_iface socket '%s'",
 686                                            global->params.ctrl_interface);
 687                                 goto fail;
 688                         }
 689                         if (bind(priv->sock, (struct sockaddr *) &addr,
 690                                  sizeof(addr)) < 0) {
 691                                 perror("bind(PF_UNIX)");
 692                                 goto fail;
 693                         }
 694                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 695                                    "ctrl_iface socket '%s'",
 696                                    global->params.ctrl_interface);
 697                 } else {
 698                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 699                                    "be in use - cannot override it");
 700                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 701                                    "not used anymore",
 702                                    global->params.ctrl_interface);
 703                         goto fail;
 704                 }
 705         }
 706
 707 #ifdef ANDROID
 708 havesock:
 709 #endif /* ANDROID */
 710         eloop_register_read_sock(priv->sock,
 711                                  wpa_supplicant_global_ctrl_iface_receive,
 712                                  global, NULL);
 713
 714         return priv;
 715
 716 fail:
 717         if (priv->sock >= 0)
 718                 close(priv->sock);
 719         os_free(priv);
 720         return NULL;
 721 }
 722
 723
 724 void
 725 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
 726 {
 727         if (priv->sock >= 0) {
 728                 eloop_unregister_read_sock(priv->sock);
 729                 close(priv->sock);
 730         }
 731         if (priv->global->params.ctrl_interface)
 732                 unlink(priv->global->params.ctrl_interface);
 733         os_free(priv);
 734 }