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 #include <unistd.h>
  15 #include <fcntl.h>
  16 #ifdef ANDROID
  17 #include <cutils/sockets.h>
  18 #endif /* ANDROID */
  19
  20 #include "utils/common.h"
  21 #include "utils/eloop.h"
  22 #include "utils/list.h"
  23 #include "eapol_supp/eapol_supp_sm.h"
  24 #include "config.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 dl_list list;
  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 dl_list 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         dl_list_add(&priv->ctrl_dst, &dst->list);
  71         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
  72                     (u8 *) from->sun_path,
  73                     fromlen - offsetof(struct sockaddr_un, sun_path));
  74         return 0;
  75 }
  76
  77
  78 static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
  79                                             struct sockaddr_un *from,
  80                                             socklen_t fromlen)
  81 {
  82         struct wpa_ctrl_dst *dst;
  83
  84         dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
  85                 if (fromlen == dst->addrlen &&
  86                     os_memcmp(from->sun_path, dst->addr.sun_path,
  87                               fromlen - offsetof(struct sockaddr_un, sun_path))
  88                     == 0) {
  89                         dl_list_del(&dst->list);
  90                         os_free(dst);
  91                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
  92                                     (u8 *) from->sun_path,
  93                                     fromlen -
  94                                     offsetof(struct sockaddr_un, sun_path));
  95                         return 0;
  96                 }
  97         }
  98         return -1;
  99 }
 100
 101
 102 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
 103                                            struct sockaddr_un *from,
 104                                            socklen_t fromlen,
 105                                            char *level)
 106 {
 107         struct wpa_ctrl_dst *dst;
 108
 109         wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
 110
 111         dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
 112                 if (fromlen == dst->addrlen &&
 113                     os_memcmp(from->sun_path, dst->addr.sun_path,
 114                               fromlen - offsetof(struct sockaddr_un, sun_path))
 115                     == 0) {
 116                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
 117                                     "level", (u8 *) from->sun_path,
 118                                     fromlen -
 119                                     offsetof(struct sockaddr_un, sun_path));
 120                         dst->debug_level = atoi(level);
 121                         return 0;
 122                 }
 123         }
 124
 125         return -1;
 126 }
 127
 128
 129 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
 130                                               void *sock_ctx)
 131 {
 132         struct wpa_supplicant *wpa_s = eloop_ctx;
 133         struct ctrl_iface_priv *priv = sock_ctx;
 134         char buf[4096];
 135         int res;
 136         struct sockaddr_un from;
 137         socklen_t fromlen = sizeof(from);
 138         char *reply = NULL;
 139         size_t reply_len = 0;
 140         int new_attached = 0;
 141
 142         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 143                        (struct sockaddr *) &from, &fromlen);
 144         if (res < 0) {
 145                 perror("recvfrom(ctrl_iface)");
 146                 return;
 147         }
 148         buf[res] = '\0';
 149
 150         if (os_strcmp(buf, "ATTACH") == 0) {
 151                 if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
 152                         reply_len = 1;
 153                 else {
 154                         new_attached = 1;
 155                         reply_len = 2;
 156                 }
 157         } else if (os_strcmp(buf, "DETACH") == 0) {
 158                 if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
 159                         reply_len = 1;
 160                 else
 161                         reply_len = 2;
 162         } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
 163                 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
 164                                                     buf + 6))
 165                         reply_len = 1;
 166                 else
 167                         reply_len = 2;
 168         } else {
 169                 reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
 170                                                           &reply_len);
 171         }
 172
 173         if (reply) {
 174                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 175                        fromlen);
 176                 os_free(reply);
 177         } else if (reply_len == 1) {
 178                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 179                        fromlen);
 180         } else if (reply_len == 2) {
 181                 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
 182                        fromlen);
 183         }
 184
 185         if (new_attached)
 186                 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
 187 }
 188
 189
 190 static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 191 {
 192         char *buf;
 193         size_t len;
 194         char *pbuf, *dir = NULL, *gid_str = NULL;
 195         int res;
 196
 197         if (wpa_s->conf->ctrl_interface == NULL)
 198                 return NULL;
 199
 200         pbuf = os_strdup(wpa_s->conf->ctrl_interface);
 201         if (pbuf == NULL)
 202                 return NULL;
 203         if (os_strncmp(pbuf, "DIR=", 4) == 0) {
 204                 dir = pbuf + 4;
 205                 gid_str = os_strstr(dir, " GROUP=");
 206                 if (gid_str) {
 207                         *gid_str = '\0';
 208                         gid_str += 7;
 209                 }
 210         } else
 211                 dir = pbuf;
 212
 213         len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
 214         buf = os_malloc(len);
 215         if (buf == NULL) {
 216                 os_free(pbuf);
 217                 return NULL;
 218         }
 219
 220         res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
 221         if (res < 0 || (size_t) res >= len) {
 222                 os_free(pbuf);
 223                 os_free(buf);
 224                 return NULL;
 225         }
 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         int flags;
 265
 266         priv = os_zalloc(sizeof(*priv));
 267         if (priv == NULL)
 268                 return NULL;
 269         dl_list_init(&priv->ctrl_dst);
 270         priv->wpa_s = wpa_s;
 271         priv->sock = -1;
 272
 273         if (wpa_s->conf->ctrl_interface == NULL)
 274                 return priv;
 275
 276         buf = os_strdup(wpa_s->conf->ctrl_interface);
 277         if (buf == NULL)
 278                 goto fail;
 279 #ifdef ANDROID
 280         os_snprintf(addr.sun_path, sizeof(addr.sun_path), "wpa_%s",
 281                     wpa_s->conf->ctrl_interface);
 282         priv->sock = android_get_control_socket(addr.sun_path);
 283         if (priv->sock >= 0)
 284                 goto havesock;
 285 #endif /* ANDROID */
 286         if (os_strncmp(buf, "DIR=", 4) == 0) {
 287                 dir = buf + 4;
 288                 gid_str = os_strstr(dir, " GROUP=");
 289                 if (gid_str) {
 290                         *gid_str = '\0';
 291                         gid_str += 7;
 292                 }
 293         } else {
 294                 dir = buf;
 295                 gid_str = wpa_s->conf->ctrl_interface_group;
 296         }
 297
 298         if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
 299                 if (errno == EEXIST) {
 300                         wpa_printf(MSG_DEBUG, "Using existing control "
 301                                    "interface directory.");
 302                 } else {
 303                         perror("mkdir[ctrl_interface]");
 304                         goto fail;
 305                 }
 306         }
 307
 308         if (gid_str) {
 309                 grp = getgrnam(gid_str);
 310                 if (grp) {
 311                         gid = grp->gr_gid;
 312                         gid_set = 1;
 313                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
 314                                    " (from group name '%s')",
 315                                    (int) gid, gid_str);
 316                 } else {
 317                         /* Group name not found - try to parse this as gid */
 318                         gid = strtol(gid_str, &endp, 10);
 319                         if (*gid_str == '\0' || *endp != '\0') {
 320                                 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
 321                                            "'%s'", gid_str);
 322                                 goto fail;
 323                         }
 324                         gid_set = 1;
 325                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
 326                                    (int) gid);
 327                 }
 328         }
 329
 330         if (gid_set && chown(dir, -1, gid) < 0) {
 331                 perror("chown[ctrl_interface]");
 332                 goto fail;
 333         }
 334
 335         /* Make sure the group can enter and read the directory */
 336         if (gid_set &&
 337             chmod(dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP) < 0) {
 338                 wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
 339                            strerror(errno));
 340                 goto fail;
 341         }
 342
 343         if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
 344             sizeof(addr.sun_path)) {
 345                 wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
 346                 goto fail;
 347         }
 348
 349         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 350         if (priv->sock < 0) {
 351                 perror("socket(PF_UNIX)");
 352                 goto fail;
 353         }
 354
 355         os_memset(&addr, 0, sizeof(addr));
 356 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 357         addr.sun_len = sizeof(addr);
 358 #endif /* __FreeBSD__ */
 359         addr.sun_family = AF_UNIX;
 360         fname = wpa_supplicant_ctrl_iface_path(wpa_s);
 361         if (fname == NULL)
 362                 goto fail;
 363         os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
 364         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 365                 wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
 366                            strerror(errno));
 367                 if (connect(priv->sock, (struct sockaddr *) &addr,
 368                             sizeof(addr)) < 0) {
 369                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 370                                    " allow connections - assuming it was left"
 371                                    "over from forced program termination");
 372                         if (unlink(fname) < 0) {
 373                                 perror("unlink[ctrl_iface]");
 374                                 wpa_printf(MSG_ERROR, "Could not unlink "
 375                                            "existing ctrl_iface socket '%s'",
 376                                            fname);
 377                                 goto fail;
 378                         }
 379                         if (bind(priv->sock, (struct sockaddr *) &addr,
 380                                  sizeof(addr)) < 0) {
 381                                 perror("supp-ctrl-iface-init: bind(PF_UNIX)");
 382                                 goto fail;
 383                         }
 384                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 385                                    "ctrl_iface socket '%s'", fname);
 386                 } else {
 387                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 388                                    "be in use - cannot override it");
 389                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 390                                    "not used anymore", fname);
 391                         os_free(fname);
 392                         fname = NULL;
 393                         goto fail;
 394                 }
 395         }
 396
 397         if (gid_set && chown(fname, -1, gid) < 0) {
 398                 perror("chown[ctrl_interface/ifname]");
 399                 goto fail;
 400         }
 401
 402         if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
 403                 perror("chmod[ctrl_interface/ifname]");
 404                 goto fail;
 405         }
 406         os_free(fname);
 407
 408 #ifdef ANDROID
 409 havesock:
 410 #endif /* ANDROID */
 411
 412         /*
 413          * Make socket non-blocking so that we don't hang forever if
 414          * target dies unexpectedly.
 415          */
 416         flags = fcntl(priv->sock, F_GETFL);
 417         if (flags >= 0) {
 418                 flags |= O_NONBLOCK;
 419                 if (fcntl(priv->sock, F_SETFL, flags) < 0) {
 420                         perror("fcntl(ctrl, O_NONBLOCK)");
 421                         /* Not fatal, continue on.*/
 422                 }
 423         }
 424
 425         eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 426                                  wpa_s, priv);
 427         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 428
 429         os_free(buf);
 430         return priv;
 431
 432 fail:
 433         if (priv->sock >= 0)
 434                 close(priv->sock);
 435         os_free(priv);
 436         if (fname) {
 437                 unlink(fname);
 438                 os_free(fname);
 439         }
 440         os_free(buf);
 441         return NULL;
 442 }
 443
 444
 445 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 446 {
 447         struct wpa_ctrl_dst *dst, *prev;
 448
 449         if (priv->sock > -1) {
 450                 char *fname;
 451                 char *buf, *dir = NULL, *gid_str = NULL;
 452                 eloop_unregister_read_sock(priv->sock);
 453                 if (!dl_list_empty(&priv->ctrl_dst)) {
 454                         /*
 455                          * Wait a second before closing the control socket if
 456                          * there are any attached monitors in order to allow
 457                          * them to receive any pending messages.
 458                          */
 459                         wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 460                                    "monitors to receive messages");
 461                         os_sleep(1, 0);
 462                 }
 463                 close(priv->sock);
 464                 priv->sock = -1;
 465                 fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
 466                 if (fname) {
 467                         unlink(fname);
 468                         os_free(fname);
 469                 }
 470
 471                 buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
 472                 if (buf == NULL)
 473                         goto free_dst;
 474                 if (os_strncmp(buf, "DIR=", 4) == 0) {
 475                         dir = buf + 4;
 476                         gid_str = os_strstr(dir, " GROUP=");
 477                         if (gid_str) {
 478                                 *gid_str = '\0';
 479                                 gid_str += 7;
 480                         }
 481                 } else
 482                         dir = buf;
 483
 484                 if (rmdir(dir) < 0) {
 485                         if (errno == ENOTEMPTY) {
 486                                 wpa_printf(MSG_DEBUG, "Control interface "
 487                                            "directory not empty - leaving it "
 488                                            "behind");
 489                         } else {
 490                                 perror("rmdir[ctrl_interface]");
 491                         }
 492                 }
 493                 os_free(buf);
 494         }
 495
 496 free_dst:
 497         dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
 498                               list)
 499                 os_free(dst);
 500         os_free(priv);
 501 }
 502
 503
 504 /**
 505  * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
 506  * @priv: Pointer to private data from wpa_supplicant_ctrl_iface_init()
 507  * @level: Priority level of the message
 508  * @buf: Message data
 509  * @len: Message length
 510  *
 511  * Send a packet to all monitor programs attached to the control interface.
 512  */
 513 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
 514                                            int level, const char *buf,
 515                                            size_t len)
 516 {
 517         struct wpa_ctrl_dst *dst, *next;
 518         char levelstr[10];
 519         int idx, res;
 520         struct msghdr msg;
 521         struct iovec io[2];
 522
 523         if (priv->sock < 0 || dl_list_empty(&priv->ctrl_dst))
 524                 return;
 525
 526         res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 527         if (res < 0 || (size_t) res >= sizeof(levelstr))
 528                 return;
 529         io[0].iov_base = levelstr;
 530         io[0].iov_len = os_strlen(levelstr);
 531         io[1].iov_base = (char *) buf;
 532         io[1].iov_len = len;
 533         os_memset(&msg, 0, sizeof(msg));
 534         msg.msg_iov = io;
 535         msg.msg_iovlen = 2;
 536
 537         idx = 0;
 538         dl_list_for_each_safe(dst, next, &priv->ctrl_dst, struct wpa_ctrl_dst,
 539                               list) {
 540                 if (level >= dst->debug_level) {
 541                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
 542                                     (u8 *) dst->addr.sun_path, dst->addrlen -
 543                                     offsetof(struct sockaddr_un, sun_path));
 544                         msg.msg_name = (void *) &dst->addr;
 545                         msg.msg_namelen = dst->addrlen;
 546                         if (sendmsg(priv->sock, &msg, 0) < 0) {
 547                                 int _errno = errno;
 548                                 wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
 549                                            "%d - %s",
 550                                            idx, errno, strerror(errno));
 551                                 dst->errors++;
 552                                 if (dst->errors > 1000 ||
 553                                     (_errno != ENOBUFS && dst->errors > 10) ||
 554                                     _errno == ENOENT) {
 555                                         wpa_supplicant_ctrl_iface_detach(
 556                                                 priv, &dst->addr,
 557                                                 dst->addrlen);
 558                                 }
 559                         } else
 560                                 dst->errors = 0;
 561                 }
 562                 idx++;
 563         }
 564 }
 565
 566
 567 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 568 {
 569         char buf[256];
 570         int res;
 571         struct sockaddr_un from;
 572         socklen_t fromlen = sizeof(from);
 573
 574         for (;;) {
 575                 wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
 576                            "attach", priv->wpa_s->ifname);
 577                 eloop_wait_for_read_sock(priv->sock);
 578
 579                 res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
 580                                (struct sockaddr *) &from, &fromlen);
 581                 if (res < 0) {
 582                         perror("recvfrom(ctrl_iface)");
 583                         continue;
 584                 }
 585                 buf[res] = '\0';
 586
 587                 if (os_strcmp(buf, "ATTACH") == 0) {
 588                         /* handle ATTACH signal of first monitor interface */
 589                         if (!wpa_supplicant_ctrl_iface_attach(priv, &from,
 590                                                               fromlen)) {
 591                                 sendto(priv->sock, "OK\n", 3, 0,
 592                                        (struct sockaddr *) &from, fromlen);
 593                                 /* OK to continue */
 594                                 return;
 595                         } else {
 596                                 sendto(priv->sock, "FAIL\n", 5, 0,
 597                                        (struct sockaddr *) &from, fromlen);
 598                         }
 599                 } else {
 600                         /* return FAIL for all other signals */
 601                         sendto(priv->sock, "FAIL\n", 5, 0,
 602                                (struct sockaddr *) &from, fromlen);
 603                 }
 604         }
 605 }
 606
 607
 608 /* Global ctrl_iface */
 609
 610 struct ctrl_iface_global_priv {
 611         struct wpa_global *global;
 612         int sock;
 613 };
 614
 615
 616 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
 617                                                      void *sock_ctx)
 618 {
 619         struct wpa_global *global = eloop_ctx;
 620         char buf[256];
 621         int res;
 622         struct sockaddr_un from;
 623         socklen_t fromlen = sizeof(from);
 624         char *reply;
 625         size_t reply_len;
 626
 627         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 628                        (struct sockaddr *) &from, &fromlen);
 629         if (res < 0) {
 630                 perror("recvfrom(ctrl_iface)");
 631                 return;
 632         }
 633         buf[res] = '\0';
 634
 635         reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
 636                                                          &reply_len);
 637
 638         if (reply) {
 639                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 640                        fromlen);
 641                 os_free(reply);
 642         } else if (reply_len) {
 643                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 644                        fromlen);
 645         }
 646 }
 647
 648
 649 struct ctrl_iface_global_priv *
 650 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 651 {
 652         struct ctrl_iface_global_priv *priv;
 653         struct sockaddr_un addr;
 654
 655         priv = os_zalloc(sizeof(*priv));
 656         if (priv == NULL)
 657                 return NULL;
 658         priv->global = global;
 659         priv->sock = -1;
 660
 661         if (global->params.ctrl_interface == NULL)
 662                 return priv;
 663
 664 #ifdef ANDROID
 665         priv->sock = android_get_control_socket(global->params.ctrl_interface);
 666         if (priv->sock >= 0)
 667                 goto havesock;
 668 #endif /* ANDROID */
 669
 670         wpa_printf(MSG_DEBUG, "Global control interface '%s'",
 671                    global->params.ctrl_interface);
 672
 673         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 674         if (priv->sock < 0) {
 675                 perror("socket(PF_UNIX)");
 676                 goto fail;
 677         }
 678
 679         os_memset(&addr, 0, sizeof(addr));
 680 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 681         addr.sun_len = sizeof(addr);
 682 #endif /* __FreeBSD__ */
 683         addr.sun_family = AF_UNIX;
 684         os_strlcpy(addr.sun_path, global->params.ctrl_interface,
 685                    sizeof(addr.sun_path));
 686         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 687                 perror("supp-global-ctrl-iface-init (will try fixup): "
 688                        "bind(PF_UNIX)");
 689                 if (connect(priv->sock, (struct sockaddr *) &addr,
 690                             sizeof(addr)) < 0) {
 691                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 692                                    " allow connections - assuming it was left"
 693                                    "over from forced program termination");
 694                         if (unlink(global->params.ctrl_interface) < 0) {
 695                                 perror("unlink[ctrl_iface]");
 696                                 wpa_printf(MSG_ERROR, "Could not unlink "
 697                                            "existing ctrl_iface socket '%s'",
 698                                            global->params.ctrl_interface);
 699                                 goto fail;
 700                         }
 701                         if (bind(priv->sock, (struct sockaddr *) &addr,
 702                                  sizeof(addr)) < 0) {
 703                                 perror("supp-glb-iface-init: bind(PF_UNIX)");
 704                                 goto fail;
 705                         }
 706                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 707                                    "ctrl_iface socket '%s'",
 708                                    global->params.ctrl_interface);
 709                 } else {
 710                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 711                                    "be in use - cannot override it");
 712                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 713                                    "not used anymore",
 714                                    global->params.ctrl_interface);
 715                         goto fail;
 716                 }
 717         }
 718
 719 #ifdef ANDROID
 720 havesock:
 721 #endif /* ANDROID */
 722         eloop_register_read_sock(priv->sock,
 723                                  wpa_supplicant_global_ctrl_iface_receive,
 724                                  global, NULL);
 725
 726         return priv;
 727
 728 fail:
 729         if (priv->sock >= 0)
 730                 close(priv->sock);
 731         os_free(priv);
 732         return NULL;
 733 }
 734
 735
 736 void
 737 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
 738 {
 739         if (priv->sock >= 0) {
 740                 eloop_unregister_read_sock(priv->sock);
 741                 close(priv->sock);
 742         }
 743         if (priv->global->params.ctrl_interface)
 744                 unlink(priv->global->params.ctrl_interface);
 745         os_free(priv);
 746 }