wpa_supplicant/ctrl_iface_unix.c

   1 /*
   2  * WPA Supplicant / UNIX domain socket -based control interface
   3  * Copyright (c) 2004-2013, 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 struct ctrl_iface_global_priv {
  54         struct wpa_global *global;
  55         int sock;
  56         struct dl_list ctrl_dst;
  57 };
  58
  59
  60 static void wpa_supplicant_ctrl_iface_send(const char *ifname, int sock,
  61                                            struct dl_list *ctrl_dst,
  62                                            int level, const char *buf,
  63                                            size_t len);
  64
  65
  66 static int wpa_supplicant_ctrl_iface_attach(struct dl_list *ctrl_dst,
  67                                             struct sockaddr_un *from,
  68                                             socklen_t fromlen)
  69 {
  70         struct wpa_ctrl_dst *dst;
  71
  72         dst = os_zalloc(sizeof(*dst));
  73         if (dst == NULL)
  74                 return -1;
  75         os_memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
  76         dst->addrlen = fromlen;
  77         dst->debug_level = MSG_INFO;
  78         dl_list_add(ctrl_dst, &dst->list);
  79         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
  80                     (u8 *) from->sun_path,
  81                     fromlen - offsetof(struct sockaddr_un, sun_path));
  82         return 0;
  83 }
  84
  85
  86 static int wpa_supplicant_ctrl_iface_detach(struct dl_list *ctrl_dst,
  87                                             struct sockaddr_un *from,
  88                                             socklen_t fromlen)
  89 {
  90         struct wpa_ctrl_dst *dst;
  91
  92         dl_list_for_each(dst, ctrl_dst, struct wpa_ctrl_dst, list) {
  93                 if (fromlen == dst->addrlen &&
  94                     os_memcmp(from->sun_path, dst->addr.sun_path,
  95                               fromlen - offsetof(struct sockaddr_un, sun_path))
  96                     == 0) {
  97                         dl_list_del(&dst->list);
  98                         os_free(dst);
  99                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
 100                                     (u8 *) from->sun_path,
 101                                     fromlen -
 102                                     offsetof(struct sockaddr_un, sun_path));
 103                         return 0;
 104                 }
 105         }
 106         return -1;
 107 }
 108
 109
 110 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
 111                                            struct sockaddr_un *from,
 112                                            socklen_t fromlen,
 113                                            char *level)
 114 {
 115         struct wpa_ctrl_dst *dst;
 116
 117         wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
 118
 119         dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
 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         }
 132
 133         return -1;
 134 }
 135
 136
 137 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
 138                                               void *sock_ctx)
 139 {
 140         struct wpa_supplicant *wpa_s = eloop_ctx;
 141         struct ctrl_iface_priv *priv = sock_ctx;
 142         char buf[4096];
 143         int res;
 144         struct sockaddr_un from;
 145         socklen_t fromlen = sizeof(from);
 146         char *reply = NULL;
 147         size_t reply_len = 0;
 148         int new_attached = 0;
 149
 150         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 151                        (struct sockaddr *) &from, &fromlen);
 152         if (res < 0) {
 153                 perror("recvfrom(ctrl_iface)");
 154                 return;
 155         }
 156         buf[res] = '\0';
 157
 158         if (os_strcmp(buf, "ATTACH") == 0) {
 159                 if (wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst, &from,
 160                                                      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->ctrl_dst, &from,
 168                                                      fromlen))
 169                         reply_len = 1;
 170                 else
 171                         reply_len = 2;
 172         } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
 173                 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
 174                                                     buf + 6))
 175                         reply_len = 1;
 176                 else
 177                         reply_len = 2;
 178         } else {
 179                 reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
 180                                                           &reply_len);
 181         }
 182
 183         if (reply) {
 184                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 185                        fromlen);
 186                 os_free(reply);
 187         } else if (reply_len == 1) {
 188                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 189                        fromlen);
 190         } else if (reply_len == 2) {
 191                 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
 192                        fromlen);
 193         }
 194
 195         if (new_attached)
 196                 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
 197 }
 198
 199
 200 static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 201 {
 202         char *buf;
 203         size_t len;
 204         char *pbuf, *dir = NULL, *gid_str = NULL;
 205         int res;
 206
 207         if (wpa_s->conf->ctrl_interface == NULL)
 208                 return NULL;
 209
 210         pbuf = os_strdup(wpa_s->conf->ctrl_interface);
 211         if (pbuf == NULL)
 212                 return NULL;
 213         if (os_strncmp(pbuf, "DIR=", 4) == 0) {
 214                 dir = pbuf + 4;
 215                 gid_str = os_strstr(dir, " GROUP=");
 216                 if (gid_str) {
 217                         *gid_str = '\0';
 218                         gid_str += 7;
 219                 }
 220         } else
 221                 dir = pbuf;
 222
 223         len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
 224         buf = os_malloc(len);
 225         if (buf == NULL) {
 226                 os_free(pbuf);
 227                 return NULL;
 228         }
 229
 230         res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
 231         if (res < 0 || (size_t) res >= len) {
 232                 os_free(pbuf);
 233                 os_free(buf);
 234                 return NULL;
 235         }
 236 #ifdef __CYGWIN__
 237         {
 238                 /* Windows/WinPcap uses interface names that are not suitable
 239                  * as a file name - convert invalid chars to underscores */
 240                 char *pos = buf;
 241                 while (*pos) {
 242                         if (*pos == '\\')
 243                                 *pos = '_';
 244                         pos++;
 245                 }
 246         }
 247 #endif /* __CYGWIN__ */
 248         os_free(pbuf);
 249         return buf;
 250 }
 251
 252
 253 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level, int global,
 254                                              const char *txt, size_t len)
 255 {
 256         struct wpa_supplicant *wpa_s = ctx;
 257
 258         if (wpa_s == NULL)
 259                 return;
 260
 261         if (global != 2 && wpa_s->global->ctrl_iface) {
 262                 struct ctrl_iface_global_priv *priv = wpa_s->global->ctrl_iface;
 263                 if (!dl_list_empty(&priv->ctrl_dst)) {
 264                         wpa_supplicant_ctrl_iface_send(global ? NULL :
 265                                                        wpa_s->ifname,
 266                                                        priv->sock,
 267                                                        &priv->ctrl_dst,
 268                                                        level, txt, len);
 269                 }
 270         }
 271
 272         if (wpa_s->ctrl_iface == NULL)
 273                 return;
 274         wpa_supplicant_ctrl_iface_send(NULL, wpa_s->ctrl_iface->sock,
 275                                        &wpa_s->ctrl_iface->ctrl_dst,
 276                                        level, txt, len);
 277 }
 278
 279
 280 struct ctrl_iface_priv *
 281 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 282 {
 283         struct ctrl_iface_priv *priv;
 284         struct sockaddr_un addr;
 285         char *fname = NULL;
 286         gid_t gid = 0;
 287         int gid_set = 0;
 288         char *buf, *dir = NULL, *gid_str = NULL;
 289         struct group *grp;
 290         char *endp;
 291         int flags;
 292
 293         priv = os_zalloc(sizeof(*priv));
 294         if (priv == NULL)
 295                 return NULL;
 296         dl_list_init(&priv->ctrl_dst);
 297         priv->wpa_s = wpa_s;
 298         priv->sock = -1;
 299
 300         if (wpa_s->conf->ctrl_interface == NULL)
 301                 return priv;
 302
 303         buf = os_strdup(wpa_s->conf->ctrl_interface);
 304         if (buf == NULL)
 305                 goto fail;
 306 #ifdef ANDROID
 307         os_snprintf(addr.sun_path, sizeof(addr.sun_path), "wpa_%s",
 308                     wpa_s->conf->ctrl_interface);
 309         priv->sock = android_get_control_socket(addr.sun_path);
 310         if (priv->sock >= 0)
 311                 goto havesock;
 312 #endif /* ANDROID */
 313         if (os_strncmp(buf, "DIR=", 4) == 0) {
 314                 dir = buf + 4;
 315                 gid_str = os_strstr(dir, " GROUP=");
 316                 if (gid_str) {
 317                         *gid_str = '\0';
 318                         gid_str += 7;
 319                 }
 320         } else {
 321                 dir = buf;
 322                 gid_str = wpa_s->conf->ctrl_interface_group;
 323         }
 324
 325         if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
 326                 if (errno == EEXIST) {
 327                         wpa_printf(MSG_DEBUG, "Using existing control "
 328                                    "interface directory.");
 329                 } else {
 330                         perror("mkdir[ctrl_interface]");
 331                         goto fail;
 332                 }
 333         }
 334
 335 #ifdef ANDROID
 336         /*
 337          * wpa_supplicant is started from /init.*.rc on Android and that seems
 338          * to be using umask 0077 which would leave the control interface
 339          * directory without group access. This breaks things since Wi-Fi
 340          * framework assumes that this directory can be accessed by other
 341          * applications in the wifi group. Fix this by adding group access even
 342          * if umask value would prevent this.
 343          */
 344         if (chmod(dir, S_IRWXU | S_IRWXG) < 0) {
 345                 wpa_printf(MSG_ERROR, "CTRL: Could not chmod directory: %s",
 346                            strerror(errno));
 347                 /* Try to continue anyway */
 348         }
 349 #endif /* ANDROID */
 350
 351         if (gid_str) {
 352                 grp = getgrnam(gid_str);
 353                 if (grp) {
 354                         gid = grp->gr_gid;
 355                         gid_set = 1;
 356                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
 357                                    " (from group name '%s')",
 358                                    (int) gid, gid_str);
 359                 } else {
 360                         /* Group name not found - try to parse this as gid */
 361                         gid = strtol(gid_str, &endp, 10);
 362                         if (*gid_str == '\0' || *endp != '\0') {
 363                                 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
 364                                            "'%s'", gid_str);
 365                                 goto fail;
 366                         }
 367                         gid_set = 1;
 368                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
 369                                    (int) gid);
 370                 }
 371         }
 372
 373         if (gid_set && chown(dir, -1, gid) < 0) {
 374                 perror("chown[ctrl_interface]");
 375                 goto fail;
 376         }
 377
 378         /* Make sure the group can enter and read the directory */
 379         if (gid_set &&
 380             chmod(dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP) < 0) {
 381                 wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
 382                            strerror(errno));
 383                 goto fail;
 384         }
 385
 386         if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
 387             sizeof(addr.sun_path)) {
 388                 wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
 389                 goto fail;
 390         }
 391
 392         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 393         if (priv->sock < 0) {
 394                 perror("socket(PF_UNIX)");
 395                 goto fail;
 396         }
 397
 398         os_memset(&addr, 0, sizeof(addr));
 399 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 400         addr.sun_len = sizeof(addr);
 401 #endif /* __FreeBSD__ */
 402         addr.sun_family = AF_UNIX;
 403         fname = wpa_supplicant_ctrl_iface_path(wpa_s);
 404         if (fname == NULL)
 405                 goto fail;
 406         os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
 407         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 408                 wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
 409                            strerror(errno));
 410                 if (connect(priv->sock, (struct sockaddr *) &addr,
 411                             sizeof(addr)) < 0) {
 412                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 413                                    " allow connections - assuming it was left"
 414                                    "over from forced program termination");
 415                         if (unlink(fname) < 0) {
 416                                 perror("unlink[ctrl_iface]");
 417                                 wpa_printf(MSG_ERROR, "Could not unlink "
 418                                            "existing ctrl_iface socket '%s'",
 419                                            fname);
 420                                 goto fail;
 421                         }
 422                         if (bind(priv->sock, (struct sockaddr *) &addr,
 423                                  sizeof(addr)) < 0) {
 424                                 perror("supp-ctrl-iface-init: bind(PF_UNIX)");
 425                                 goto fail;
 426                         }
 427                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 428                                    "ctrl_iface socket '%s'", fname);
 429                 } else {
 430                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 431                                    "be in use - cannot override it");
 432                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 433                                    "not used anymore", fname);
 434                         os_free(fname);
 435                         fname = NULL;
 436                         goto fail;
 437                 }
 438         }
 439
 440         if (gid_set && chown(fname, -1, gid) < 0) {
 441                 perror("chown[ctrl_interface/ifname]");
 442                 goto fail;
 443         }
 444
 445         if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
 446                 perror("chmod[ctrl_interface/ifname]");
 447                 goto fail;
 448         }
 449         os_free(fname);
 450
 451 #ifdef ANDROID
 452 havesock:
 453 #endif /* ANDROID */
 454
 455         /*
 456          * Make socket non-blocking so that we don't hang forever if
 457          * target dies unexpectedly.
 458          */
 459         flags = fcntl(priv->sock, F_GETFL);
 460         if (flags >= 0) {
 461                 flags |= O_NONBLOCK;
 462                 if (fcntl(priv->sock, F_SETFL, flags) < 0) {
 463                         perror("fcntl(ctrl, O_NONBLOCK)");
 464                         /* Not fatal, continue on.*/
 465                 }
 466         }
 467
 468         eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 469                                  wpa_s, priv);
 470         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 471
 472         os_free(buf);
 473         return priv;
 474
 475 fail:
 476         if (priv->sock >= 0)
 477                 close(priv->sock);
 478         os_free(priv);
 479         if (fname) {
 480                 unlink(fname);
 481                 os_free(fname);
 482         }
 483         os_free(buf);
 484         return NULL;
 485 }
 486
 487
 488 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 489 {
 490         struct wpa_ctrl_dst *dst, *prev;
 491
 492         if (priv->sock > -1) {
 493                 char *fname;
 494                 char *buf, *dir = NULL, *gid_str = NULL;
 495                 eloop_unregister_read_sock(priv->sock);
 496                 if (!dl_list_empty(&priv->ctrl_dst)) {
 497                         /*
 498                          * Wait a second before closing the control socket if
 499                          * there are any attached monitors in order to allow
 500                          * them to receive any pending messages.
 501                          */
 502                         wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 503                                    "monitors to receive messages");
 504                         os_sleep(1, 0);
 505                 }
 506                 close(priv->sock);
 507                 priv->sock = -1;
 508                 fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
 509                 if (fname) {
 510                         unlink(fname);
 511                         os_free(fname);
 512                 }
 513
 514                 buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
 515                 if (buf == NULL)
 516                         goto free_dst;
 517                 if (os_strncmp(buf, "DIR=", 4) == 0) {
 518                         dir = buf + 4;
 519                         gid_str = os_strstr(dir, " GROUP=");
 520                         if (gid_str) {
 521                                 *gid_str = '\0';
 522                                 gid_str += 7;
 523                         }
 524                 } else
 525                         dir = buf;
 526
 527                 if (rmdir(dir) < 0) {
 528                         if (errno == ENOTEMPTY) {
 529                                 wpa_printf(MSG_DEBUG, "Control interface "
 530                                            "directory not empty - leaving it "
 531                                            "behind");
 532                         } else {
 533                                 perror("rmdir[ctrl_interface]");
 534                         }
 535                 }
 536                 os_free(buf);
 537         }
 538
 539 free_dst:
 540         dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
 541                               list)
 542                 os_free(dst);
 543         os_free(priv);
 544 }
 545
 546
 547 /**
 548  * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
 549  * @ifname: Interface name for global control socket or %NULL
 550  * @sock: Local socket fd
 551  * @ctrl_dst: List of attached listeners
 552  * @level: Priority level of the message
 553  * @buf: Message data
 554  * @len: Message length
 555  *
 556  * Send a packet to all monitor programs attached to the control interface.
 557  */
 558 static void wpa_supplicant_ctrl_iface_send(const char *ifname, int sock,
 559                                            struct dl_list *ctrl_dst,
 560                                            int level, const char *buf,
 561                                            size_t len)
 562 {
 563         struct wpa_ctrl_dst *dst, *next;
 564         char levelstr[10];
 565         int idx, res;
 566         struct msghdr msg;
 567         struct iovec io[5];
 568
 569         if (sock < 0 || dl_list_empty(ctrl_dst))
 570                 return;
 571
 572         res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 573         if (res < 0 || (size_t) res >= sizeof(levelstr))
 574                 return;
 575         idx = 0;
 576         if (ifname) {
 577                 io[idx].iov_base = "IFNAME=";
 578                 io[idx].iov_len = 7;
 579                 idx++;
 580                 io[idx].iov_base = (char *) ifname;
 581                 io[idx].iov_len = os_strlen(ifname);
 582                 idx++;
 583                 io[idx].iov_base = " ";
 584                 io[idx].iov_len = 1;
 585                 idx++;
 586         }
 587         io[idx].iov_base = levelstr;
 588         io[idx].iov_len = os_strlen(levelstr);
 589         idx++;
 590         io[idx].iov_base = (char *) buf;
 591         io[idx].iov_len = len;
 592         idx++;
 593         os_memset(&msg, 0, sizeof(msg));
 594         msg.msg_iov = io;
 595         msg.msg_iovlen = idx;
 596
 597         idx = 0;
 598         dl_list_for_each_safe(dst, next, ctrl_dst, struct wpa_ctrl_dst, list) {
 599                 if (level >= dst->debug_level) {
 600                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
 601                                     (u8 *) dst->addr.sun_path, dst->addrlen -
 602                                     offsetof(struct sockaddr_un, sun_path));
 603                         msg.msg_name = (void *) &dst->addr;
 604                         msg.msg_namelen = dst->addrlen;
 605                         if (sendmsg(sock, &msg, MSG_DONTWAIT) < 0) {
 606                                 int _errno = errno;
 607                                 wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
 608                                            "%d - %s",
 609                                            idx, errno, strerror(errno));
 610                                 dst->errors++;
 611                                 if (dst->errors > 1000 ||
 612                                     (_errno != ENOBUFS && dst->errors > 10) ||
 613                                     _errno == ENOENT) {
 614                                         wpa_supplicant_ctrl_iface_detach(
 615                                                 ctrl_dst, &dst->addr,
 616                                                 dst->addrlen);
 617                                 }
 618                         } else
 619                                 dst->errors = 0;
 620                 }
 621                 idx++;
 622         }
 623 }
 624
 625
 626 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 627 {
 628         char buf[256];
 629         int res;
 630         struct sockaddr_un from;
 631         socklen_t fromlen = sizeof(from);
 632
 633         for (;;) {
 634                 wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
 635                            "attach", priv->wpa_s->ifname);
 636                 eloop_wait_for_read_sock(priv->sock);
 637
 638                 res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
 639                                (struct sockaddr *) &from, &fromlen);
 640                 if (res < 0) {
 641                         perror("recvfrom(ctrl_iface)");
 642                         continue;
 643                 }
 644                 buf[res] = '\0';
 645
 646                 if (os_strcmp(buf, "ATTACH") == 0) {
 647                         /* handle ATTACH signal of first monitor interface */
 648                         if (!wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst,
 649                                                               &from, fromlen)) {
 650                                 sendto(priv->sock, "OK\n", 3, 0,
 651                                        (struct sockaddr *) &from, fromlen);
 652                                 /* OK to continue */
 653                                 return;
 654                         } else {
 655                                 sendto(priv->sock, "FAIL\n", 5, 0,
 656                                        (struct sockaddr *) &from, fromlen);
 657                         }
 658                 } else {
 659                         /* return FAIL for all other signals */
 660                         sendto(priv->sock, "FAIL\n", 5, 0,
 661                                (struct sockaddr *) &from, fromlen);
 662                 }
 663         }
 664 }
 665
 666
 667 /* Global ctrl_iface */
 668
 669 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
 670                                                      void *sock_ctx)
 671 {
 672         struct wpa_global *global = eloop_ctx;
 673         struct ctrl_iface_global_priv *priv = sock_ctx;
 674         char buf[256];
 675         int res;
 676         struct sockaddr_un from;
 677         socklen_t fromlen = sizeof(from);
 678         char *reply = NULL;
 679         size_t reply_len;
 680
 681         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 682                        (struct sockaddr *) &from, &fromlen);
 683         if (res < 0) {
 684                 perror("recvfrom(ctrl_iface)");
 685                 return;
 686         }
 687         buf[res] = '\0';
 688
 689         if (os_strcmp(buf, "ATTACH") == 0) {
 690                 if (wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst, &from,
 691                                                      fromlen))
 692                         reply_len = 1;
 693                 else
 694                         reply_len = 2;
 695         } else if (os_strcmp(buf, "DETACH") == 0) {
 696                 if (wpa_supplicant_ctrl_iface_detach(&priv->ctrl_dst, &from,
 697                                                      fromlen))
 698                         reply_len = 1;
 699                 else
 700                         reply_len = 2;
 701         } else {
 702                 reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
 703                                                                  &reply_len);
 704         }
 705
 706         if (reply) {
 707                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 708                        fromlen);
 709                 os_free(reply);
 710         } else if (reply_len == 1) {
 711                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 712                        fromlen);
 713         } else if (reply_len == 2) {
 714                 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from, fromlen);
 715         }
 716 }
 717
 718
 719 struct ctrl_iface_global_priv *
 720 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 721 {
 722         struct ctrl_iface_global_priv *priv;
 723         struct sockaddr_un addr;
 724         const char *ctrl = global->params.ctrl_interface;
 725
 726         priv = os_zalloc(sizeof(*priv));
 727         if (priv == NULL)
 728                 return NULL;
 729         dl_list_init(&priv->ctrl_dst);
 730         priv->global = global;
 731         priv->sock = -1;
 732
 733         if (ctrl == NULL)
 734                 return priv;
 735
 736         wpa_printf(MSG_DEBUG, "Global control interface '%s'", ctrl);
 737
 738 #ifdef ANDROID
 739         if (os_strncmp(ctrl, "@android:", 9) == 0) {
 740                 priv->sock = android_get_control_socket(ctrl + 9);
 741                 if (priv->sock < 0) {
 742                         wpa_printf(MSG_ERROR, "Failed to open Android control "
 743                                    "socket '%s'", ctrl + 9);
 744                         goto fail;
 745                 }
 746                 wpa_printf(MSG_DEBUG, "Using Android control socket '%s'",
 747                            ctrl + 9);
 748                 goto havesock;
 749         }
 750
 751         if (os_strncmp(ctrl, "@abstract:", 10) != 0) {
 752                 /*
 753                  * Backwards compatibility - try to open an Android control
 754                  * socket and if that fails, assume this was a UNIX domain
 755                  * socket instead.
 756                  */
 757                 priv->sock = android_get_control_socket(ctrl);
 758                 if (priv->sock >= 0) {
 759                         wpa_printf(MSG_DEBUG,
 760                                    "Using Android control socket '%s'",
 761                                    ctrl);
 762                         goto havesock;
 763                 }
 764         }
 765 #endif /* ANDROID */
 766
 767         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 768         if (priv->sock < 0) {
 769                 perror("socket(PF_UNIX)");
 770                 goto fail;
 771         }
 772
 773         os_memset(&addr, 0, sizeof(addr));
 774 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 775         addr.sun_len = sizeof(addr);
 776 #endif /* __FreeBSD__ */
 777         addr.sun_family = AF_UNIX;
 778
 779         if (os_strncmp(ctrl, "@abstract:", 10) == 0) {
 780                 addr.sun_path[0] = '\0';
 781                 os_strlcpy(addr.sun_path + 1, ctrl + 10,
 782                            sizeof(addr.sun_path) - 1);
 783                 if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) <
 784                     0) {
 785                         wpa_printf(MSG_ERROR, "supp-global-ctrl-iface-init: "
 786                                    "bind(PF_UNIX) failed: %s", strerror(errno));
 787                         goto fail;
 788                 }
 789                 wpa_printf(MSG_DEBUG, "Using Abstract control socket '%s'",
 790                            ctrl + 10);
 791                 goto havesock;
 792         }
 793
 794         os_strlcpy(addr.sun_path, ctrl, sizeof(addr.sun_path));
 795         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 796                 perror("supp-global-ctrl-iface-init (will try fixup): "
 797                        "bind(PF_UNIX)");
 798                 if (connect(priv->sock, (struct sockaddr *) &addr,
 799                             sizeof(addr)) < 0) {
 800                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 801                                    " allow connections - assuming it was left"
 802                                    "over from forced program termination");
 803                         if (unlink(ctrl) < 0) {
 804                                 perror("unlink[ctrl_iface]");
 805                                 wpa_printf(MSG_ERROR, "Could not unlink "
 806                                            "existing ctrl_iface socket '%s'",
 807                                            ctrl);
 808                                 goto fail;
 809                         }
 810                         if (bind(priv->sock, (struct sockaddr *) &addr,
 811                                  sizeof(addr)) < 0) {
 812                                 perror("supp-glb-iface-init: bind(PF_UNIX)");
 813                                 goto fail;
 814                         }
 815                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 816                                    "ctrl_iface socket '%s'",
 817                                    ctrl);
 818                 } else {
 819                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 820                                    "be in use - cannot override it");
 821                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 822                                    "not used anymore",
 823                                    ctrl);
 824                         goto fail;
 825                 }
 826         }
 827
 828         wpa_printf(MSG_DEBUG, "Using UNIX control socket '%s'", ctrl);
 829
 830         if (global->params.ctrl_interface_group) {
 831                 char *gid_str = global->params.ctrl_interface_group;
 832                 gid_t gid = 0;
 833                 struct group *grp;
 834                 char *endp;
 835
 836                 grp = getgrnam(gid_str);
 837                 if (grp) {
 838                         gid = grp->gr_gid;
 839                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
 840                                    " (from group name '%s')",
 841                                    (int) gid, gid_str);
 842                 } else {
 843                         /* Group name not found - try to parse this as gid */
 844                         gid = strtol(gid_str, &endp, 10);
 845                         if (*gid_str == '\0' || *endp != '\0') {
 846                                 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
 847                                            "'%s'", gid_str);
 848                                 goto fail;
 849                         }
 850                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
 851                                    (int) gid);
 852                 }
 853                 if (chown(ctrl, -1, gid) < 0) {
 854                         perror("chown[global_ctrl_interface/ifname]");
 855                         goto fail;
 856                 }
 857
 858                 if (chmod(ctrl, S_IRWXU | S_IRWXG) < 0) {
 859                         perror("chmod[global_ctrl_interface/ifname]");
 860                         goto fail;
 861                 }
 862         } else {
 863                 chmod(ctrl, S_IRWXU);
 864         }
 865
 866 havesock:
 867         eloop_register_read_sock(priv->sock,
 868                                  wpa_supplicant_global_ctrl_iface_receive,
 869                                  global, priv);
 870
 871         return priv;
 872
 873 fail:
 874         if (priv->sock >= 0)
 875                 close(priv->sock);
 876         os_free(priv);
 877         return NULL;
 878 }
 879
 880
 881 void
 882 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
 883 {
 884         struct wpa_ctrl_dst *dst, *prev;
 885
 886         if (priv->sock >= 0) {
 887                 eloop_unregister_read_sock(priv->sock);
 888                 close(priv->sock);
 889         }
 890         if (priv->global->params.ctrl_interface)
 891                 unlink(priv->global->params.ctrl_interface);
 892         dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
 893                               list)
 894                 os_free(dst);
 895         os_free(priv);
 896 }