wpa_supplicant/ctrl_iface_unix.c

   1 /*
   2  * WPA Supplicant / UNIX domain socket -based control interface
   3  * Copyright (c) 2004-2005, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16 #include <sys/un.h>
  17 #include <sys/stat.h>
  18 #include <grp.h>
  19 #include <stddef.h>
  20
  21 #include "common.h"
  22 #include "eloop.h"
  23 #include "config.h"
  24 #include "eapol_supp/eapol_supp_sm.h"
  25 #include "wpa_supplicant_i.h"
  26 #include "ctrl_iface.h"
  27
  28 /* Per-interface ctrl_iface */
  29
  30 /**
  31  * struct wpa_ctrl_dst - Internal data structure of control interface monitors
  32  *
  33  * This structure is used to store information about registered control
  34  * interface monitors into struct wpa_supplicant. This data is private to
  35  * ctrl_iface_unix.c and should not be touched directly from other files.
  36  */
  37 struct wpa_ctrl_dst {
  38         struct wpa_ctrl_dst *next;
  39         struct sockaddr_un addr;
  40         socklen_t addrlen;
  41         int debug_level;
  42         int errors;
  43 };
  44
  45
  46 struct ctrl_iface_priv {
  47         struct wpa_supplicant *wpa_s;
  48         int sock;
  49         struct wpa_ctrl_dst *ctrl_dst;
  50 };
  51
  52
  53 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
  54                                            int level, const char *buf,
  55                                            size_t len);
  56
  57
  58 static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
  59                                             struct sockaddr_un *from,
  60                                             socklen_t fromlen)
  61 {
  62         struct wpa_ctrl_dst *dst;
  63
  64         dst = os_zalloc(sizeof(*dst));
  65         if (dst == NULL)
  66                 return -1;
  67         os_memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
  68         dst->addrlen = fromlen;
  69         dst->debug_level = MSG_INFO;
  70         dst->next = priv->ctrl_dst;
  71         priv->ctrl_dst = dst;
  72         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
  73                     (u8 *) from->sun_path,
  74                     fromlen - offsetof(struct sockaddr_un, sun_path));
  75         return 0;
  76 }
  77
  78
  79 static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
  80                                             struct sockaddr_un *from,
  81                                             socklen_t fromlen)
  82 {
  83         struct wpa_ctrl_dst *dst, *prev = NULL;
  84
  85         dst = priv->ctrl_dst;
  86         while (dst) {
  87                 if (fromlen == dst->addrlen &&
  88                     os_memcmp(from->sun_path, dst->addr.sun_path,
  89                               fromlen - offsetof(struct sockaddr_un, sun_path))
  90                     == 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 -
  99                                     offsetof(struct sockaddr_un, sun_path));
 100                         return 0;
 101                 }
 102                 prev = dst;
 103                 dst = dst->next;
 104         }
 105         return -1;
 106 }
 107
 108
 109 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
 110                                            struct sockaddr_un *from,
 111                                            socklen_t fromlen,
 112                                            char *level)
 113 {
 114         struct wpa_ctrl_dst *dst;
 115
 116         wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
 117
 118         dst = priv->ctrl_dst;
 119         while (dst) {
 120                 if (fromlen == dst->addrlen &&
 121                     os_memcmp(from->sun_path, dst->addr.sun_path,
 122                               fromlen - offsetof(struct sockaddr_un, sun_path))
 123                     == 0) {
 124                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
 125                                     "level", (u8 *) from->sun_path,
 126                                     fromlen -
 127                                     offsetof(struct sockaddr_un, sun_path));
 128                         dst->debug_level = atoi(level);
 129                         return 0;
 130                 }
 131                 dst = dst->next;
 132         }
 133
 134         return -1;
 135 }
 136
 137
 138 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
 139                                               void *sock_ctx)
 140 {
 141         struct wpa_supplicant *wpa_s = eloop_ctx;
 142         struct ctrl_iface_priv *priv = sock_ctx;
 143         char buf[256];
 144         int res;
 145         struct sockaddr_un from;
 146         socklen_t fromlen = sizeof(from);
 147         char *reply = NULL;
 148         size_t reply_len = 0;
 149         int new_attached = 0;
 150
 151         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 152                        (struct sockaddr *) &from, &fromlen);
 153         if (res < 0) {
 154                 perror("recvfrom(ctrl_iface)");
 155                 return;
 156         }
 157         buf[res] = '\0';
 158
 159         if (os_strcmp(buf, "ATTACH") == 0) {
 160                 if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
 161                         reply_len = 1;
 162                 else {
 163                         new_attached = 1;
 164                         reply_len = 2;
 165                 }
 166         } else if (os_strcmp(buf, "DETACH") == 0) {
 167                 if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
 168                         reply_len = 1;
 169                 else
 170                         reply_len = 2;
 171         } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
 172                 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
 173                                                     buf + 6))
 174                         reply_len = 1;
 175                 else
 176                         reply_len = 2;
 177         } else {
 178                 reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
 179                                                           &reply_len);
 180         }
 181
 182         if (reply) {
 183                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 184                        fromlen);
 185                 os_free(reply);
 186         } else if (reply_len == 1) {
 187                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 188                        fromlen);
 189         } else if (reply_len == 2) {
 190                 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
 191                        fromlen);
 192         }
 193
 194         if (new_attached)
 195                 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
 196 }
 197
 198
 199 static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 200 {
 201         char *buf;
 202         size_t len;
 203         char *pbuf, *dir = NULL, *gid_str = NULL;
 204         int res;
 205
 206         if (wpa_s->conf->ctrl_interface == NULL)
 207                 return NULL;
 208
 209         pbuf = os_strdup(wpa_s->conf->ctrl_interface);
 210         if (pbuf == NULL)
 211                 return NULL;
 212         if (os_strncmp(pbuf, "DIR=", 4) == 0) {
 213                 dir = pbuf + 4;
 214                 gid_str = os_strstr(dir, " GROUP=");
 215                 if (gid_str) {
 216                         *gid_str = '\0';
 217                         gid_str += 7;
 218                 }
 219         } else
 220                 dir = pbuf;
 221
 222         len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
 223         buf = os_malloc(len);
 224         if (buf == NULL) {
 225                 os_free(pbuf);
 226                 return NULL;
 227         }
 228
 229         res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
 230         if (res < 0 || (size_t) res >= len) {
 231                 os_free(pbuf);
 232                 os_free(buf);
 233                 return NULL;
 234         }
 235 #ifdef __CYGWIN__
 236         {
 237                 /* Windows/WinPcap uses interface names that are not suitable
 238                  * as a file name - convert invalid chars to underscores */
 239                 char *pos = buf;
 240                 while (*pos) {
 241                         if (*pos == '\\')
 242                                 *pos = '_';
 243                         pos++;
 244                 }
 245         }
 246 #endif /* __CYGWIN__ */
 247         os_free(pbuf);
 248         return buf;
 249 }
 250
 251
 252 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
 253                                              const char *txt, size_t len)
 254 {
 255         struct wpa_supplicant *wpa_s = ctx;
 256         if (wpa_s == NULL || wpa_s->ctrl_iface == NULL)
 257                 return;
 258         wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
 259 }
 260
 261
 262 struct ctrl_iface_priv *
 263 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 264 {
 265         struct ctrl_iface_priv *priv;
 266         struct sockaddr_un addr;
 267         char *fname = NULL;
 268         gid_t gid = 0;
 269         int gid_set = 0;
 270         char *buf, *dir = NULL, *gid_str = NULL;
 271         struct group *grp;
 272         char *endp;
 273
 274         priv = os_zalloc(sizeof(*priv));
 275         if (priv == NULL)
 276                 return NULL;
 277         priv->wpa_s = wpa_s;
 278         priv->sock = -1;
 279
 280         if (wpa_s->conf->ctrl_interface == NULL)
 281                 return priv;
 282
 283         buf = os_strdup(wpa_s->conf->ctrl_interface);
 284         if (buf == NULL)
 285                 goto fail;
 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         if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
 336             sizeof(addr.sun_path)) {
 337                 wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
 338                 goto fail;
 339         }
 340
 341         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 342         if (priv->sock < 0) {
 343                 perror("socket(PF_UNIX)");
 344                 goto fail;
 345         }
 346
 347         os_memset(&addr, 0, sizeof(addr));
 348 #ifdef __FreeBSD__
 349         addr.sun_len = sizeof(addr);
 350 #endif /* __FreeBSD__ */
 351         addr.sun_family = AF_UNIX;
 352         fname = wpa_supplicant_ctrl_iface_path(wpa_s);
 353         if (fname == NULL)
 354                 goto fail;
 355         os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
 356         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 357                 wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
 358                            strerror(errno));
 359                 if (connect(priv->sock, (struct sockaddr *) &addr,
 360                             sizeof(addr)) < 0) {
 361                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 362                                    " allow connections - assuming it was left"
 363                                    "over from forced program termination");
 364                         if (unlink(fname) < 0) {
 365                                 perror("unlink[ctrl_iface]");
 366                                 wpa_printf(MSG_ERROR, "Could not unlink "
 367                                            "existing ctrl_iface socket '%s'",
 368                                            fname);
 369                                 goto fail;
 370                         }
 371                         if (bind(priv->sock, (struct sockaddr *) &addr,
 372                                  sizeof(addr)) < 0) {
 373                                 perror("bind(PF_UNIX)");
 374                                 goto fail;
 375                         }
 376                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 377                                    "ctrl_iface socket '%s'", fname);
 378                 } else {
 379                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 380                                    "be in use - cannot override it");
 381                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 382                                    "not used anymore", fname);
 383                         os_free(fname);
 384                         fname = NULL;
 385                         goto fail;
 386                 }
 387         }
 388
 389         if (gid_set && chown(fname, -1, gid) < 0) {
 390                 perror("chown[ctrl_interface/ifname]");
 391                 goto fail;
 392         }
 393
 394         if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
 395                 perror("chmod[ctrl_interface/ifname]");
 396                 goto fail;
 397         }
 398         os_free(fname);
 399
 400         eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 401                                  wpa_s, priv);
 402         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 403
 404         os_free(buf);
 405         return priv;
 406
 407 fail:
 408         if (priv->sock >= 0)
 409                 close(priv->sock);
 410         os_free(priv);
 411         if (fname) {
 412                 unlink(fname);
 413                 os_free(fname);
 414         }
 415         os_free(buf);
 416         return NULL;
 417 }
 418
 419
 420 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 421 {
 422         struct wpa_ctrl_dst *dst, *prev;
 423
 424         if (priv->sock > -1) {
 425                 char *fname;
 426                 char *buf, *dir = NULL, *gid_str = NULL;
 427                 eloop_unregister_read_sock(priv->sock);
 428                 if (priv->ctrl_dst) {
 429                         /*
 430                          * Wait a second before closing the control socket if
 431                          * there are any attached monitors in order to allow
 432                          * them to receive any pending messages.
 433                          */
 434                         wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 435                                    "monitors to receive messages");
 436                         os_sleep(1, 0);
 437                 }
 438                 close(priv->sock);
 439                 priv->sock = -1;
 440                 fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
 441                 if (fname) {
 442                         unlink(fname);
 443                         os_free(fname);
 444                 }
 445
 446                 buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
 447                 if (buf == NULL)
 448                         goto free_dst;
 449                 if (os_strncmp(buf, "DIR=", 4) == 0) {
 450                         dir = buf + 4;
 451                         gid_str = os_strstr(dir, " GROUP=");
 452                         if (gid_str) {
 453                                 *gid_str = '\0';
 454                                 gid_str += 7;
 455                         }
 456                 } else
 457                         dir = buf;
 458
 459                 if (rmdir(dir) < 0) {
 460                         if (errno == ENOTEMPTY) {
 461                                 wpa_printf(MSG_DEBUG, "Control interface "
 462                                            "directory not empty - leaving it "
 463                                            "behind");
 464                         } else {
 465                                 perror("rmdir[ctrl_interface]");
 466                         }
 467                 }
 468                 os_free(buf);
 469         }
 470
 471 free_dst:
 472         dst = priv->ctrl_dst;
 473         while (dst) {
 474                 prev = dst;
 475                 dst = dst->next;
 476                 os_free(prev);
 477         }
 478         os_free(priv);
 479 }
 480
 481
 482 /**
 483  * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
 484  * @priv: Pointer to private data from wpa_supplicant_ctrl_iface_init()
 485  * @level: Priority level of the message
 486  * @buf: Message data
 487  * @len: Message length
 488  *
 489  * Send a packet to all monitor programs attached to the control interface.
 490  */
 491 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
 492                                            int level, const char *buf,
 493                                            size_t len)
 494 {
 495         struct wpa_ctrl_dst *dst, *next;
 496         char levelstr[10];
 497         int idx, res;
 498         struct msghdr msg;
 499         struct iovec io[2];
 500
 501         dst = priv->ctrl_dst;
 502         if (priv->sock < 0 || dst == NULL)
 503                 return;
 504
 505         res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 506         if (res < 0 || (size_t) res >= sizeof(levelstr))
 507                 return;
 508         io[0].iov_base = levelstr;
 509         io[0].iov_len = os_strlen(levelstr);
 510         io[1].iov_base = (char *) buf;
 511         io[1].iov_len = len;
 512         os_memset(&msg, 0, sizeof(msg));
 513         msg.msg_iov = io;
 514         msg.msg_iovlen = 2;
 515
 516         idx = 0;
 517         while (dst) {
 518                 next = dst->next;
 519                 if (level >= dst->debug_level) {
 520                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
 521                                     (u8 *) dst->addr.sun_path, dst->addrlen -
 522                                     offsetof(struct sockaddr_un, sun_path));
 523                         msg.msg_name = (void *) &dst->addr;
 524                         msg.msg_namelen = dst->addrlen;
 525                         if (sendmsg(priv->sock, &msg, 0) < 0) {
 526                                 int _errno = errno;
 527                                 wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
 528                                            "%d - %s",
 529                                            idx, errno, strerror(errno));
 530                                 dst->errors++;
 531                                 if (dst->errors > 10 || _errno == ENOENT) {
 532                                         wpa_supplicant_ctrl_iface_detach(
 533                                                 priv, &dst->addr,
 534                                                 dst->addrlen);
 535                                 }
 536                         } else
 537                                 dst->errors = 0;
 538                 }
 539                 idx++;
 540                 dst = next;
 541         }
 542 }
 543
 544
 545 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 546 {
 547         char buf[256];
 548         int res;
 549         struct sockaddr_un from;
 550         socklen_t fromlen = sizeof(from);
 551
 552         for (;;) {
 553                 wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
 554                            "attach", priv->wpa_s->ifname);
 555                 eloop_wait_for_read_sock(priv->sock);
 556
 557                 res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
 558                                (struct sockaddr *) &from, &fromlen);
 559                 if (res < 0) {
 560                         perror("recvfrom(ctrl_iface)");
 561                         continue;
 562                 }
 563                 buf[res] = '\0';
 564
 565                 if (os_strcmp(buf, "ATTACH") == 0) {
 566                         /* handle ATTACH signal of first monitor interface */
 567                         if (!wpa_supplicant_ctrl_iface_attach(priv, &from,
 568                                                               fromlen)) {
 569                                 sendto(priv->sock, "OK\n", 3, 0,
 570                                        (struct sockaddr *) &from, fromlen);
 571                                 /* OK to continue */
 572                                 return;
 573                         } else {
 574                                 sendto(priv->sock, "FAIL\n", 5, 0,
 575                                        (struct sockaddr *) &from, fromlen);
 576                         }
 577                 } else {
 578                         /* return FAIL for all other signals */
 579                         sendto(priv->sock, "FAIL\n", 5, 0,
 580                                (struct sockaddr *) &from, fromlen);
 581                 }
 582         }
 583 }
 584
 585
 586 /* Global ctrl_iface */
 587
 588 struct ctrl_iface_global_priv {
 589         struct wpa_global *global;
 590         int sock;
 591 };
 592
 593
 594 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
 595                                                      void *sock_ctx)
 596 {
 597         struct wpa_global *global = eloop_ctx;
 598         char buf[256];
 599         int res;
 600         struct sockaddr_un from;
 601         socklen_t fromlen = sizeof(from);
 602         char *reply;
 603         size_t reply_len;
 604
 605         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 606                        (struct sockaddr *) &from, &fromlen);
 607         if (res < 0) {
 608                 perror("recvfrom(ctrl_iface)");
 609                 return;
 610         }
 611         buf[res] = '\0';
 612
 613         reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
 614                                                          &reply_len);
 615
 616         if (reply) {
 617                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 618                        fromlen);
 619                 os_free(reply);
 620         } else if (reply_len) {
 621                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 622                        fromlen);
 623         }
 624 }
 625
 626
 627 struct ctrl_iface_global_priv *
 628 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 629 {
 630         struct ctrl_iface_global_priv *priv;
 631         struct sockaddr_un addr;
 632
 633         priv = os_zalloc(sizeof(*priv));
 634         if (priv == NULL)
 635                 return NULL;
 636         priv->global = global;
 637         priv->sock = -1;
 638
 639         if (global->params.ctrl_interface == NULL)
 640                 return priv;
 641
 642         wpa_printf(MSG_DEBUG, "Global control interface '%s'",
 643                    global->params.ctrl_interface);
 644
 645         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 646         if (priv->sock < 0) {
 647                 perror("socket(PF_UNIX)");
 648                 goto fail;
 649         }
 650
 651         os_memset(&addr, 0, sizeof(addr));
 652 #ifdef __FreeBSD__
 653         addr.sun_len = sizeof(addr);
 654 #endif /* __FreeBSD__ */
 655         addr.sun_family = AF_UNIX;
 656         os_strlcpy(addr.sun_path, global->params.ctrl_interface,
 657                    sizeof(addr.sun_path));
 658         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 659                 perror("bind(PF_UNIX)");
 660                 if (connect(priv->sock, (struct sockaddr *) &addr,
 661                             sizeof(addr)) < 0) {
 662                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 663                                    " allow connections - assuming it was left"
 664                                    "over from forced program termination");
 665                         if (unlink(global->params.ctrl_interface) < 0) {
 666                                 perror("unlink[ctrl_iface]");
 667                                 wpa_printf(MSG_ERROR, "Could not unlink "
 668                                            "existing ctrl_iface socket '%s'",
 669                                            global->params.ctrl_interface);
 670                                 goto fail;
 671                         }
 672                         if (bind(priv->sock, (struct sockaddr *) &addr,
 673                                  sizeof(addr)) < 0) {
 674                                 perror("bind(PF_UNIX)");
 675                                 goto fail;
 676                         }
 677                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 678                                    "ctrl_iface socket '%s'",
 679                                    global->params.ctrl_interface);
 680                 } else {
 681                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 682                                    "be in use - cannot override it");
 683                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 684                                    "not used anymore",
 685                                    global->params.ctrl_interface);
 686                         goto fail;
 687                 }
 688         }
 689
 690         eloop_register_read_sock(priv->sock,
 691                                  wpa_supplicant_global_ctrl_iface_receive,
 692                                  global, NULL);
 693
 694         return priv;
 695
 696 fail:
 697         if (priv->sock >= 0)
 698                 close(priv->sock);
 699         os_free(priv);
 700         return NULL;
 701 }
 702
 703
 704 void
 705 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
 706 {
 707         if (priv->sock >= 0) {
 708                 eloop_unregister_read_sock(priv->sock);
 709                 close(priv->sock);
 710         }
 711         if (priv->global->params.ctrl_interface)
 712                 unlink(priv->global->params.ctrl_interface);
 713         os_free(priv);
 714 }