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 #if defined(CONFIG_P2P) && defined(ANDROID_P2P)
 170                 char *ifname, *ifend;
 171
 172                 ifname = os_strstr(buf, "interface=");
 173                 if (ifname != NULL) {
 174                         ifend = os_strchr(ifname + 10, ' ');
 175                         if (ifend != NULL)
 176                                 *ifend++ = '\0';
 177                         else
 178                                 ifend = "";
 179                         wpa_printf(MSG_DEBUG, "Found %s", ifname);
 180                         for (wpa_s = wpa_s->global->ifaces; wpa_s; wpa_s = wpa_s->next) {
 181                                 if (os_strcmp(wpa_s->ifname, ifname + 10) == 0)
 182                                         break;
 183                         }
 184                         if (wpa_s == NULL) {
 185                                 wpa_printf(MSG_ERROR, "P2P: %s does not exist", ifname);
 186                                 wpa_s = eloop_ctx;
 187                         }
 188                         os_memmove(ifname, ifend, strlen(ifend) + 1);
 189                         wpa_printf(MSG_INFO, "wpa_s %p cmd %s", wpa_s, buf);
 190                 }
 191 #endif /* defined CONFIG_P2P && defined ANDROID_P2P */
 192                 reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
 193                                                           &reply_len);
 194         }
 195
 196         if (reply) {
 197                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 198                        fromlen);
 199                 os_free(reply);
 200         } else if (reply_len == 1) {
 201                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 202                        fromlen);
 203         } else if (reply_len == 2) {
 204                 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
 205                        fromlen);
 206         }
 207
 208         if (new_attached)
 209                 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
 210 }
 211
 212
 213 static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 214 {
 215         char *buf;
 216         size_t len;
 217         char *pbuf, *dir = NULL, *gid_str = NULL;
 218         int res;
 219
 220         if (wpa_s->conf->ctrl_interface == NULL)
 221                 return NULL;
 222
 223         pbuf = os_strdup(wpa_s->conf->ctrl_interface);
 224         if (pbuf == NULL)
 225                 return NULL;
 226         if (os_strncmp(pbuf, "DIR=", 4) == 0) {
 227                 dir = pbuf + 4;
 228                 gid_str = os_strstr(dir, " GROUP=");
 229                 if (gid_str) {
 230                         *gid_str = '\0';
 231                         gid_str += 7;
 232                 }
 233         } else
 234                 dir = pbuf;
 235
 236         len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
 237         buf = os_malloc(len);
 238         if (buf == NULL) {
 239                 os_free(pbuf);
 240                 return NULL;
 241         }
 242
 243         res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
 244         if (res < 0 || (size_t) res >= len) {
 245                 os_free(pbuf);
 246                 os_free(buf);
 247                 return NULL;
 248         }
 249 #ifdef __CYGWIN__
 250         {
 251                 /* Windows/WinPcap uses interface names that are not suitable
 252                  * as a file name - convert invalid chars to underscores */
 253                 char *pos = buf;
 254                 while (*pos) {
 255                         if (*pos == '\\')
 256                                 *pos = '_';
 257                         pos++;
 258                 }
 259         }
 260 #endif /* __CYGWIN__ */
 261         os_free(pbuf);
 262         return buf;
 263 }
 264
 265
 266 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
 267                                              const char *txt, size_t len)
 268 {
 269         struct wpa_supplicant *wpa_s = ctx;
 270         if (wpa_s == NULL || wpa_s->ctrl_iface == NULL)
 271                 return;
 272         wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
 273 }
 274
 275
 276 struct ctrl_iface_priv *
 277 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 278 {
 279         struct ctrl_iface_priv *priv;
 280         struct sockaddr_un addr;
 281         char *fname = NULL;
 282         gid_t gid = 0;
 283         int gid_set = 0;
 284         char *buf, *dir = NULL, *gid_str = NULL;
 285         struct group *grp;
 286         char *endp;
 287         int flags;
 288
 289         priv = os_zalloc(sizeof(*priv));
 290         if (priv == NULL)
 291                 return NULL;
 292         dl_list_init(&priv->ctrl_dst);
 293         priv->wpa_s = wpa_s;
 294         priv->sock = -1;
 295
 296         if (wpa_s->conf->ctrl_interface == NULL)
 297                 return priv;
 298
 299         buf = os_strdup(wpa_s->conf->ctrl_interface);
 300         if (buf == NULL)
 301                 goto fail;
 302 #ifdef ANDROID
 303         os_snprintf(addr.sun_path, sizeof(addr.sun_path), "wpa_%s",
 304                     wpa_s->conf->ctrl_interface);
 305         priv->sock = android_get_control_socket(addr.sun_path);
 306         if (priv->sock >= 0)
 307                 goto havesock;
 308 #endif /* ANDROID */
 309         if (os_strncmp(buf, "DIR=", 4) == 0) {
 310                 dir = buf + 4;
 311                 gid_str = os_strstr(dir, " GROUP=");
 312                 if (gid_str) {
 313                         *gid_str = '\0';
 314                         gid_str += 7;
 315                 }
 316         } else {
 317                 dir = buf;
 318                 gid_str = wpa_s->conf->ctrl_interface_group;
 319         }
 320
 321         if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
 322                 if (errno == EEXIST) {
 323                         wpa_printf(MSG_DEBUG, "Using existing control "
 324                                    "interface directory.");
 325                 } else {
 326                         perror("mkdir[ctrl_interface]");
 327                         goto fail;
 328                 }
 329         }
 330
 331         if (gid_str) {
 332                 grp = getgrnam(gid_str);
 333                 if (grp) {
 334                         gid = grp->gr_gid;
 335                         gid_set = 1;
 336                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
 337                                    " (from group name '%s')",
 338                                    (int) gid, gid_str);
 339                 } else {
 340                         /* Group name not found - try to parse this as gid */
 341                         gid = strtol(gid_str, &endp, 10);
 342                         if (*gid_str == '\0' || *endp != '\0') {
 343                                 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
 344                                            "'%s'", gid_str);
 345                                 goto fail;
 346                         }
 347                         gid_set = 1;
 348                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
 349                                    (int) gid);
 350                 }
 351         }
 352
 353         if (gid_set && chown(dir, -1, gid) < 0) {
 354                 perror("chown[ctrl_interface]");
 355                 goto fail;
 356         }
 357
 358         /* Make sure the group can enter and read the directory */
 359         if (gid_set &&
 360             chmod(dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP) < 0) {
 361                 wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
 362                            strerror(errno));
 363                 goto fail;
 364         }
 365
 366         if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
 367             sizeof(addr.sun_path)) {
 368                 wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
 369                 goto fail;
 370         }
 371
 372         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 373         if (priv->sock < 0) {
 374                 perror("socket(PF_UNIX)");
 375                 goto fail;
 376         }
 377
 378         os_memset(&addr, 0, sizeof(addr));
 379 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 380         addr.sun_len = sizeof(addr);
 381 #endif /* __FreeBSD__ */
 382         addr.sun_family = AF_UNIX;
 383         fname = wpa_supplicant_ctrl_iface_path(wpa_s);
 384         if (fname == NULL)
 385                 goto fail;
 386         os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
 387         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 388                 wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
 389                            strerror(errno));
 390                 if (connect(priv->sock, (struct sockaddr *) &addr,
 391                             sizeof(addr)) < 0) {
 392                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 393                                    " allow connections - assuming it was left"
 394                                    "over from forced program termination");
 395                         if (unlink(fname) < 0) {
 396                                 perror("unlink[ctrl_iface]");
 397                                 wpa_printf(MSG_ERROR, "Could not unlink "
 398                                            "existing ctrl_iface socket '%s'",
 399                                            fname);
 400                                 goto fail;
 401                         }
 402                         if (bind(priv->sock, (struct sockaddr *) &addr,
 403                                  sizeof(addr)) < 0) {
 404                                 perror("supp-ctrl-iface-init: bind(PF_UNIX)");
 405                                 goto fail;
 406                         }
 407                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 408                                    "ctrl_iface socket '%s'", fname);
 409                 } else {
 410                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 411                                    "be in use - cannot override it");
 412                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 413                                    "not used anymore", fname);
 414                         os_free(fname);
 415                         fname = NULL;
 416                         goto fail;
 417                 }
 418         }
 419
 420         if (gid_set && chown(fname, -1, gid) < 0) {
 421                 perror("chown[ctrl_interface/ifname]");
 422                 goto fail;
 423         }
 424
 425         if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
 426                 perror("chmod[ctrl_interface/ifname]");
 427                 goto fail;
 428         }
 429         os_free(fname);
 430
 431 #ifdef ANDROID
 432 havesock:
 433 #endif /* ANDROID */
 434
 435         /*
 436          * Make socket non-blocking so that we don't hang forever if
 437          * target dies unexpectedly.
 438          */
 439         flags = fcntl(priv->sock, F_GETFL);
 440         if (flags >= 0) {
 441                 flags |= O_NONBLOCK;
 442                 if (fcntl(priv->sock, F_SETFL, flags) < 0) {
 443                         perror("fcntl(ctrl, O_NONBLOCK)");
 444                         /* Not fatal, continue on.*/
 445                 }
 446         }
 447
 448         eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 449                                  wpa_s, priv);
 450         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 451
 452         os_free(buf);
 453         return priv;
 454
 455 fail:
 456         if (priv->sock >= 0)
 457                 close(priv->sock);
 458         os_free(priv);
 459         if (fname) {
 460                 unlink(fname);
 461                 os_free(fname);
 462         }
 463         os_free(buf);
 464         return NULL;
 465 }
 466
 467
 468 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 469 {
 470         struct wpa_ctrl_dst *dst, *prev;
 471
 472         if (priv->sock > -1) {
 473                 char *fname;
 474                 char *buf, *dir = NULL, *gid_str = NULL;
 475                 eloop_unregister_read_sock(priv->sock);
 476                 if (!dl_list_empty(&priv->ctrl_dst)) {
 477                         /*
 478                          * Wait a second before closing the control socket if
 479                          * there are any attached monitors in order to allow
 480                          * them to receive any pending messages.
 481                          */
 482                         wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 483                                    "monitors to receive messages");
 484                         os_sleep(1, 0);
 485                 }
 486                 close(priv->sock);
 487                 priv->sock = -1;
 488                 fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
 489                 if (fname) {
 490                         unlink(fname);
 491                         os_free(fname);
 492                 }
 493
 494                 buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
 495                 if (buf == NULL)
 496                         goto free_dst;
 497                 if (os_strncmp(buf, "DIR=", 4) == 0) {
 498                         dir = buf + 4;
 499                         gid_str = os_strstr(dir, " GROUP=");
 500                         if (gid_str) {
 501                                 *gid_str = '\0';
 502                                 gid_str += 7;
 503                         }
 504                 } else
 505                         dir = buf;
 506
 507                 if (rmdir(dir) < 0) {
 508                         if (errno == ENOTEMPTY) {
 509                                 wpa_printf(MSG_DEBUG, "Control interface "
 510                                            "directory not empty - leaving it "
 511                                            "behind");
 512                         } else {
 513                                 perror("rmdir[ctrl_interface]");
 514                         }
 515                 }
 516                 os_free(buf);
 517         }
 518
 519 free_dst:
 520         dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
 521                               list)
 522                 os_free(dst);
 523         os_free(priv);
 524 }
 525
 526
 527 /**
 528  * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
 529  * @priv: Pointer to private data from wpa_supplicant_ctrl_iface_init()
 530  * @level: Priority level of the message
 531  * @buf: Message data
 532  * @len: Message length
 533  *
 534  * Send a packet to all monitor programs attached to the control interface.
 535  */
 536 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
 537                                            int level, const char *buf,
 538                                            size_t len)
 539 {
 540         struct wpa_ctrl_dst *dst, *next;
 541         char levelstr[10];
 542         int idx, res;
 543         struct msghdr msg;
 544         struct iovec io[2];
 545
 546         if (priv->sock < 0 || dl_list_empty(&priv->ctrl_dst))
 547                 return;
 548
 549         res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 550         if (res < 0 || (size_t) res >= sizeof(levelstr))
 551                 return;
 552         io[0].iov_base = levelstr;
 553         io[0].iov_len = os_strlen(levelstr);
 554         io[1].iov_base = (char *) buf;
 555         io[1].iov_len = len;
 556         os_memset(&msg, 0, sizeof(msg));
 557         msg.msg_iov = io;
 558         msg.msg_iovlen = 2;
 559
 560         idx = 0;
 561         dl_list_for_each_safe(dst, next, &priv->ctrl_dst, struct wpa_ctrl_dst,
 562                               list) {
 563                 if (level >= dst->debug_level) {
 564                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
 565                                     (u8 *) dst->addr.sun_path, dst->addrlen -
 566                                     offsetof(struct sockaddr_un, sun_path));
 567                         msg.msg_name = (void *) &dst->addr;
 568                         msg.msg_namelen = dst->addrlen;
 569                         if (sendmsg(priv->sock, &msg, 0) < 0) {
 570                                 int _errno = errno;
 571                                 wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
 572                                            "%d - %s",
 573                                            idx, errno, strerror(errno));
 574                                 dst->errors++;
 575                                 if (dst->errors > 1000 ||
 576                                     (_errno != ENOBUFS && dst->errors > 10) ||
 577                                     _errno == ENOENT) {
 578                                         wpa_supplicant_ctrl_iface_detach(
 579                                                 priv, &dst->addr,
 580                                                 dst->addrlen);
 581                                 }
 582                         } else
 583                                 dst->errors = 0;
 584                 }
 585                 idx++;
 586         }
 587 }
 588
 589
 590 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 591 {
 592         char buf[256];
 593         int res;
 594         struct sockaddr_un from;
 595         socklen_t fromlen = sizeof(from);
 596
 597         for (;;) {
 598                 wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
 599                            "attach", priv->wpa_s->ifname);
 600                 eloop_wait_for_read_sock(priv->sock);
 601
 602                 res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
 603                                (struct sockaddr *) &from, &fromlen);
 604                 if (res < 0) {
 605                         perror("recvfrom(ctrl_iface)");
 606                         continue;
 607                 }
 608                 buf[res] = '\0';
 609
 610                 if (os_strcmp(buf, "ATTACH") == 0) {
 611                         /* handle ATTACH signal of first monitor interface */
 612                         if (!wpa_supplicant_ctrl_iface_attach(priv, &from,
 613                                                               fromlen)) {
 614                                 sendto(priv->sock, "OK\n", 3, 0,
 615                                        (struct sockaddr *) &from, fromlen);
 616                                 /* OK to continue */
 617                                 return;
 618                         } else {
 619                                 sendto(priv->sock, "FAIL\n", 5, 0,
 620                                        (struct sockaddr *) &from, fromlen);
 621                         }
 622                 } else {
 623                         /* return FAIL for all other signals */
 624                         sendto(priv->sock, "FAIL\n", 5, 0,
 625                                (struct sockaddr *) &from, fromlen);
 626                 }
 627         }
 628 }
 629
 630
 631 /* Global ctrl_iface */
 632
 633 struct ctrl_iface_global_priv {
 634         struct wpa_global *global;
 635         int sock;
 636 };
 637
 638
 639 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
 640                                                      void *sock_ctx)
 641 {
 642         struct wpa_global *global = eloop_ctx;
 643         char buf[256];
 644         int res;
 645         struct sockaddr_un from;
 646         socklen_t fromlen = sizeof(from);
 647         char *reply;
 648         size_t reply_len;
 649
 650         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 651                        (struct sockaddr *) &from, &fromlen);
 652         if (res < 0) {
 653                 perror("recvfrom(ctrl_iface)");
 654                 return;
 655         }
 656         buf[res] = '\0';
 657
 658         reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
 659                                                          &reply_len);
 660
 661         if (reply) {
 662                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 663                        fromlen);
 664                 os_free(reply);
 665         } else if (reply_len) {
 666                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 667                        fromlen);
 668         }
 669 }
 670
 671
 672 struct ctrl_iface_global_priv *
 673 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 674 {
 675         struct ctrl_iface_global_priv *priv;
 676         struct sockaddr_un addr;
 677
 678         priv = os_zalloc(sizeof(*priv));
 679         if (priv == NULL)
 680                 return NULL;
 681         priv->global = global;
 682         priv->sock = -1;
 683
 684         if (global->params.ctrl_interface == NULL)
 685                 return priv;
 686
 687 #ifdef ANDROID
 688         priv->sock = android_get_control_socket(global->params.ctrl_interface);
 689         if (priv->sock >= 0)
 690                 goto havesock;
 691 #endif /* ANDROID */
 692
 693         wpa_printf(MSG_DEBUG, "Global control interface '%s'",
 694                    global->params.ctrl_interface);
 695
 696         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 697         if (priv->sock < 0) {
 698                 perror("socket(PF_UNIX)");
 699                 goto fail;
 700         }
 701
 702         os_memset(&addr, 0, sizeof(addr));
 703 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 704         addr.sun_len = sizeof(addr);
 705 #endif /* __FreeBSD__ */
 706         addr.sun_family = AF_UNIX;
 707         os_strlcpy(addr.sun_path, global->params.ctrl_interface,
 708                    sizeof(addr.sun_path));
 709         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 710                 perror("supp-global-ctrl-iface-init (will try fixup): "
 711                        "bind(PF_UNIX)");
 712                 if (connect(priv->sock, (struct sockaddr *) &addr,
 713                             sizeof(addr)) < 0) {
 714                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 715                                    " allow connections - assuming it was left"
 716                                    "over from forced program termination");
 717                         if (unlink(global->params.ctrl_interface) < 0) {
 718                                 perror("unlink[ctrl_iface]");
 719                                 wpa_printf(MSG_ERROR, "Could not unlink "
 720                                            "existing ctrl_iface socket '%s'",
 721                                            global->params.ctrl_interface);
 722                                 goto fail;
 723                         }
 724                         if (bind(priv->sock, (struct sockaddr *) &addr,
 725                                  sizeof(addr)) < 0) {
 726                                 perror("supp-glb-iface-init: bind(PF_UNIX)");
 727                                 goto fail;
 728                         }
 729                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 730                                    "ctrl_iface socket '%s'",
 731                                    global->params.ctrl_interface);
 732                 } else {
 733                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 734                                    "be in use - cannot override it");
 735                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 736                                    "not used anymore",
 737                                    global->params.ctrl_interface);
 738                         goto fail;
 739                 }
 740         }
 741
 742 #ifdef ANDROID
 743 havesock:
 744 #endif /* ANDROID */
 745         eloop_register_read_sock(priv->sock,
 746                                  wpa_supplicant_global_ctrl_iface_receive,
 747                                  global, NULL);
 748
 749         return priv;
 750
 751 fail:
 752         if (priv->sock >= 0)
 753                 close(priv->sock);
 754         os_free(priv);
 755         return NULL;
 756 }
 757
 758
 759 void
 760 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
 761 {
 762         if (priv->sock >= 0) {
 763                 eloop_unregister_read_sock(priv->sock);
 764                 close(priv->sock);
 765         }
 766         if (priv->global->params.ctrl_interface)
 767                 unlink(priv->global->params.ctrl_interface);
 768         os_free(priv);
 769 }