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 #ifdef ANDROID
  15 #include <cutils/sockets.h>
  16 #endif /* ANDROID */
  17
  18 #include "utils/common.h"
  19 #include "utils/eloop.h"
  20 #include "utils/list.h"
  21 #include "eapol_supp/eapol_supp_sm.h"
  22 #include "config.h"
  23 #include "wpa_supplicant_i.h"
  24 #include "ctrl_iface.h"
  25
  26 /* Per-interface ctrl_iface */
  27
  28 /**
  29  * struct wpa_ctrl_dst - Internal data structure of control interface monitors
  30  *
  31  * This structure is used to store information about registered control
  32  * interface monitors into struct wpa_supplicant. This data is private to
  33  * ctrl_iface_unix.c and should not be touched directly from other files.
  34  */
  35 struct wpa_ctrl_dst {
  36         struct dl_list list;
  37         struct sockaddr_un addr;
  38         socklen_t addrlen;
  39         int debug_level;
  40         int errors;
  41 };
  42
  43
  44 struct ctrl_iface_priv {
  45         struct wpa_supplicant *wpa_s;
  46         int sock;
  47         struct dl_list ctrl_dst;
  48 };
  49
  50
  51 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
  52                                            int level, const char *buf,
  53                                            size_t len);
  54
  55
  56 static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
  57                                             struct sockaddr_un *from,
  58                                             socklen_t fromlen)
  59 {
  60         struct wpa_ctrl_dst *dst;
  61
  62         dst = os_zalloc(sizeof(*dst));
  63         if (dst == NULL)
  64                 return -1;
  65         os_memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
  66         dst->addrlen = fromlen;
  67         dst->debug_level = MSG_INFO;
  68         dl_list_add(&priv->ctrl_dst, &dst->list);
  69         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
  70                     (u8 *) from->sun_path,
  71                     fromlen - offsetof(struct sockaddr_un, sun_path));
  72         return 0;
  73 }
  74
  75
  76 static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
  77                                             struct sockaddr_un *from,
  78                                             socklen_t fromlen)
  79 {
  80         struct wpa_ctrl_dst *dst;
  81
  82         dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
  83                 if (fromlen == dst->addrlen &&
  84                     os_memcmp(from->sun_path, dst->addr.sun_path,
  85                               fromlen - offsetof(struct sockaddr_un, sun_path))
  86                     == 0) {
  87                         dl_list_del(&dst->list);
  88                         os_free(dst);
  89                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
  90                                     (u8 *) from->sun_path,
  91                                     fromlen -
  92                                     offsetof(struct sockaddr_un, sun_path));
  93                         return 0;
  94                 }
  95         }
  96         return -1;
  97 }
  98
  99
 100 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
 101                                            struct sockaddr_un *from,
 102                                            socklen_t fromlen,
 103                                            char *level)
 104 {
 105         struct wpa_ctrl_dst *dst;
 106
 107         wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
 108
 109         dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
 110                 if (fromlen == dst->addrlen &&
 111                     os_memcmp(from->sun_path, dst->addr.sun_path,
 112                               fromlen - offsetof(struct sockaddr_un, sun_path))
 113                     == 0) {
 114                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
 115                                     "level", (u8 *) from->sun_path,
 116                                     fromlen -
 117                                     offsetof(struct sockaddr_un, sun_path));
 118                         dst->debug_level = atoi(level);
 119                         return 0;
 120                 }
 121         }
 122
 123         return -1;
 124 }
 125
 126
 127 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
 128                                               void *sock_ctx)
 129 {
 130         struct wpa_supplicant *wpa_s = eloop_ctx;
 131         struct ctrl_iface_priv *priv = sock_ctx;
 132         char buf[4096];
 133         int res;
 134         struct sockaddr_un from;
 135         socklen_t fromlen = sizeof(from);
 136         char *reply = NULL;
 137         size_t reply_len = 0;
 138         int new_attached = 0;
 139
 140         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 141                        (struct sockaddr *) &from, &fromlen);
 142         if (res < 0) {
 143                 perror("recvfrom(ctrl_iface)");
 144                 return;
 145         }
 146         buf[res] = '\0';
 147
 148         if (os_strcmp(buf, "ATTACH") == 0) {
 149                 if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
 150                         reply_len = 1;
 151                 else {
 152                         new_attached = 1;
 153                         reply_len = 2;
 154                 }
 155         } else if (os_strcmp(buf, "DETACH") == 0) {
 156                 if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
 157                         reply_len = 1;
 158                 else
 159                         reply_len = 2;
 160         } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
 161                 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
 162                                                     buf + 6))
 163                         reply_len = 1;
 164                 else
 165                         reply_len = 2;
 166         } else {
 167 #if defined(CONFIG_P2P) && defined(ANDROID_P2P)
 168                 char *ifname, *ifend;
 169
 170                 ifname = os_strstr(buf, "interface=");
 171                 if (ifname != NULL) {
 172                         ifend = os_strchr(ifname + 10, ' ');
 173                         if (ifend != NULL)
 174                                 *ifend++ = '\0';
 175                         else
 176                                 ifend = "";
 177                         wpa_printf(MSG_DEBUG, "Found %s", ifname);
 178                         for (wpa_s = wpa_s->global->ifaces; wpa_s; wpa_s = wpa_s->next) {
 179                                 if (os_strcmp(wpa_s->ifname, ifname + 10) == 0)
 180                                         break;
 181                         }
 182                         if (wpa_s == NULL) {
 183                                 wpa_printf(MSG_ERROR, "P2P: %s does not exist", ifname);
 184                                 wpa_s = eloop_ctx;
 185                         }
 186                         os_memmove(ifname, ifend, strlen(ifend) + 1);
 187                         wpa_printf(MSG_DEBUG, "wpa_s %p cmd %s", wpa_s, buf);
 188                 }
 189 #endif /* defined CONFIG_P2P && defined ANDROID_P2P */
 190                 reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
 191                                                           &reply_len);
 192         }
 193
 194         if (reply) {
 195                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 196                        fromlen);
 197                 os_free(reply);
 198         } else if (reply_len == 1) {
 199                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 200                        fromlen);
 201         } else if (reply_len == 2) {
 202                 sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
 203                        fromlen);
 204         }
 205
 206         if (new_attached)
 207                 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
 208 }
 209
 210
 211 static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 212 {
 213         char *buf;
 214         size_t len;
 215         char *pbuf, *dir = NULL, *gid_str = NULL;
 216         int res;
 217
 218         if (wpa_s->conf->ctrl_interface == NULL)
 219                 return NULL;
 220
 221         pbuf = os_strdup(wpa_s->conf->ctrl_interface);
 222         if (pbuf == NULL)
 223                 return NULL;
 224         if (os_strncmp(pbuf, "DIR=", 4) == 0) {
 225                 dir = pbuf + 4;
 226                 gid_str = os_strstr(dir, " GROUP=");
 227                 if (gid_str) {
 228                         *gid_str = '\0';
 229                         gid_str += 7;
 230                 }
 231         } else
 232                 dir = pbuf;
 233
 234         len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
 235         buf = os_malloc(len);
 236         if (buf == NULL) {
 237                 os_free(pbuf);
 238                 return NULL;
 239         }
 240
 241         res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
 242         if (res < 0 || (size_t) res >= len) {
 243                 os_free(pbuf);
 244                 os_free(buf);
 245                 return NULL;
 246         }
 247 #ifdef __CYGWIN__
 248         {
 249                 /* Windows/WinPcap uses interface names that are not suitable
 250                  * as a file name - convert invalid chars to underscores */
 251                 char *pos = buf;
 252                 while (*pos) {
 253                         if (*pos == '\\')
 254                                 *pos = '_';
 255                         pos++;
 256                 }
 257         }
 258 #endif /* __CYGWIN__ */
 259         os_free(pbuf);
 260         return buf;
 261 }
 262
 263
 264 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
 265                                              const char *txt, size_t len)
 266 {
 267         struct wpa_supplicant *wpa_s = ctx;
 268         if (wpa_s == NULL || wpa_s->ctrl_iface == NULL)
 269                 return;
 270         wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
 271 }
 272
 273
 274 struct ctrl_iface_priv *
 275 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 276 {
 277         struct ctrl_iface_priv *priv;
 278         struct sockaddr_un addr;
 279         char *fname = NULL;
 280         gid_t gid = 0;
 281         int gid_set = 0;
 282         char *buf, *dir = NULL, *gid_str = NULL;
 283         struct group *grp;
 284         char *endp;
 285
 286         priv = os_zalloc(sizeof(*priv));
 287         if (priv == NULL)
 288                 return NULL;
 289         dl_list_init(&priv->ctrl_dst);
 290         priv->wpa_s = wpa_s;
 291         priv->sock = -1;
 292
 293         if (wpa_s->conf->ctrl_interface == NULL)
 294                 return priv;
 295
 296         buf = os_strdup(wpa_s->conf->ctrl_interface);
 297         if (buf == NULL)
 298                 goto fail;
 299 #ifdef ANDROID
 300         os_snprintf(addr.sun_path, sizeof(addr.sun_path), "wpa_%s",
 301                     wpa_s->conf->ctrl_interface);
 302         priv->sock = android_get_control_socket(addr.sun_path);
 303         if (priv->sock >= 0)
 304                 goto havesock;
 305 #endif /* ANDROID */
 306         if (os_strncmp(buf, "DIR=", 4) == 0) {
 307                 dir = buf + 4;
 308                 gid_str = os_strstr(dir, " GROUP=");
 309                 if (gid_str) {
 310                         *gid_str = '\0';
 311                         gid_str += 7;
 312                 }
 313         } else {
 314                 dir = buf;
 315                 gid_str = wpa_s->conf->ctrl_interface_group;
 316         }
 317
 318         if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
 319                 if (errno == EEXIST) {
 320                         wpa_printf(MSG_DEBUG, "Using existing control "
 321                                    "interface directory.");
 322                 } else {
 323                         perror("mkdir[ctrl_interface]");
 324                         goto fail;
 325                 }
 326         }
 327
 328         if (gid_str) {
 329                 grp = getgrnam(gid_str);
 330                 if (grp) {
 331                         gid = grp->gr_gid;
 332                         gid_set = 1;
 333                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
 334                                    " (from group name '%s')",
 335                                    (int) gid, gid_str);
 336                 } else {
 337                         /* Group name not found - try to parse this as gid */
 338                         gid = strtol(gid_str, &endp, 10);
 339                         if (*gid_str == '\0' || *endp != '\0') {
 340                                 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
 341                                            "'%s'", gid_str);
 342                                 goto fail;
 343                         }
 344                         gid_set = 1;
 345                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
 346                                    (int) gid);
 347                 }
 348         }
 349
 350         if (gid_set && chown(dir, -1, gid) < 0) {
 351                 perror("chown[ctrl_interface]");
 352                 goto fail;
 353         }
 354
 355         /* Make sure the group can enter and read the directory */
 356         if (gid_set &&
 357             chmod(dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP) < 0) {
 358                 wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
 359                            strerror(errno));
 360                 goto fail;
 361         }
 362
 363         if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
 364             sizeof(addr.sun_path)) {
 365                 wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
 366                 goto fail;
 367         }
 368
 369         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 370         if (priv->sock < 0) {
 371                 perror("socket(PF_UNIX)");
 372                 goto fail;
 373         }
 374
 375         os_memset(&addr, 0, sizeof(addr));
 376 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 377         addr.sun_len = sizeof(addr);
 378 #endif /* __FreeBSD__ */
 379         addr.sun_family = AF_UNIX;
 380         fname = wpa_supplicant_ctrl_iface_path(wpa_s);
 381         if (fname == NULL)
 382                 goto fail;
 383         os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
 384         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 385                 wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
 386                            strerror(errno));
 387                 if (connect(priv->sock, (struct sockaddr *) &addr,
 388                             sizeof(addr)) < 0) {
 389                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 390                                    " allow connections - assuming it was left"
 391                                    "over from forced program termination");
 392                         if (unlink(fname) < 0) {
 393                                 perror("unlink[ctrl_iface]");
 394                                 wpa_printf(MSG_ERROR, "Could not unlink "
 395                                            "existing ctrl_iface socket '%s'",
 396                                            fname);
 397                                 goto fail;
 398                         }
 399                         if (bind(priv->sock, (struct sockaddr *) &addr,
 400                                  sizeof(addr)) < 0) {
 401                                 perror("supp-ctrl-iface-init: bind(PF_UNIX)");
 402                                 goto fail;
 403                         }
 404                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 405                                    "ctrl_iface socket '%s'", fname);
 406                 } else {
 407                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 408                                    "be in use - cannot override it");
 409                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 410                                    "not used anymore", fname);
 411                         os_free(fname);
 412                         fname = NULL;
 413                         goto fail;
 414                 }
 415         }
 416
 417         if (gid_set && chown(fname, -1, gid) < 0) {
 418                 perror("chown[ctrl_interface/ifname]");
 419                 goto fail;
 420         }
 421
 422         if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
 423                 perror("chmod[ctrl_interface/ifname]");
 424                 goto fail;
 425         }
 426         os_free(fname);
 427
 428 #ifdef ANDROID
 429 havesock:
 430 #endif /* ANDROID */
 431         eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 432                                  wpa_s, priv);
 433         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 434
 435         os_free(buf);
 436         return priv;
 437
 438 fail:
 439         if (priv->sock >= 0)
 440                 close(priv->sock);
 441         os_free(priv);
 442         if (fname) {
 443                 unlink(fname);
 444                 os_free(fname);
 445         }
 446         os_free(buf);
 447         return NULL;
 448 }
 449
 450
 451 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 452 {
 453         struct wpa_ctrl_dst *dst, *prev;
 454
 455         if (priv->sock > -1) {
 456                 char *fname;
 457                 char *buf, *dir = NULL, *gid_str = NULL;
 458                 eloop_unregister_read_sock(priv->sock);
 459                 if (!dl_list_empty(&priv->ctrl_dst)) {
 460                         /*
 461                          * Wait a second before closing the control socket if
 462                          * there are any attached monitors in order to allow
 463                          * them to receive any pending messages.
 464                          */
 465                         wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 466                                    "monitors to receive messages");
 467                         os_sleep(1, 0);
 468                 }
 469                 close(priv->sock);
 470                 priv->sock = -1;
 471                 fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
 472                 if (fname) {
 473                         unlink(fname);
 474                         os_free(fname);
 475                 }
 476
 477                 buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
 478                 if (buf == NULL)
 479                         goto free_dst;
 480                 if (os_strncmp(buf, "DIR=", 4) == 0) {
 481                         dir = buf + 4;
 482                         gid_str = os_strstr(dir, " GROUP=");
 483                         if (gid_str) {
 484                                 *gid_str = '\0';
 485                                 gid_str += 7;
 486                         }
 487                 } else
 488                         dir = buf;
 489
 490                 if (rmdir(dir) < 0) {
 491                         if (errno == ENOTEMPTY) {
 492                                 wpa_printf(MSG_DEBUG, "Control interface "
 493                                            "directory not empty - leaving it "
 494                                            "behind");
 495                         } else {
 496                                 perror("rmdir[ctrl_interface]");
 497                         }
 498                 }
 499                 os_free(buf);
 500         }
 501
 502 free_dst:
 503         dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
 504                               list)
 505                 os_free(dst);
 506         os_free(priv);
 507 }
 508
 509
 510 /**
 511  * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
 512  * @priv: Pointer to private data from wpa_supplicant_ctrl_iface_init()
 513  * @level: Priority level of the message
 514  * @buf: Message data
 515  * @len: Message length
 516  *
 517  * Send a packet to all monitor programs attached to the control interface.
 518  */
 519 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
 520                                            int level, const char *buf,
 521                                            size_t len)
 522 {
 523         struct wpa_ctrl_dst *dst, *next;
 524         char levelstr[10];
 525         int idx, res;
 526         struct msghdr msg;
 527         struct iovec io[2];
 528
 529         if (priv->sock < 0 || dl_list_empty(&priv->ctrl_dst))
 530                 return;
 531
 532         res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 533         if (res < 0 || (size_t) res >= sizeof(levelstr))
 534                 return;
 535         io[0].iov_base = levelstr;
 536         io[0].iov_len = os_strlen(levelstr);
 537         io[1].iov_base = (char *) buf;
 538         io[1].iov_len = len;
 539         os_memset(&msg, 0, sizeof(msg));
 540         msg.msg_iov = io;
 541         msg.msg_iovlen = 2;
 542
 543         idx = 0;
 544         dl_list_for_each_safe(dst, next, &priv->ctrl_dst, struct wpa_ctrl_dst,
 545                               list) {
 546                 if (level >= dst->debug_level) {
 547                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
 548                                     (u8 *) dst->addr.sun_path, dst->addrlen -
 549                                     offsetof(struct sockaddr_un, sun_path));
 550                         msg.msg_name = (void *) &dst->addr;
 551                         msg.msg_namelen = dst->addrlen;
 552                         if (sendmsg(priv->sock, &msg, 0) < 0) {
 553                                 int _errno = errno;
 554                                 wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
 555                                            "%d - %s",
 556                                            idx, errno, strerror(errno));
 557                                 dst->errors++;
 558                                 if (dst->errors > 1000 ||
 559                                     (_errno != ENOBUFS && dst->errors > 10) ||
 560                                     _errno == ENOENT) {
 561                                         wpa_supplicant_ctrl_iface_detach(
 562                                                 priv, &dst->addr,
 563                                                 dst->addrlen);
 564                                 }
 565                         } else
 566                                 dst->errors = 0;
 567                 }
 568                 idx++;
 569         }
 570 }
 571
 572
 573 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 574 {
 575         char buf[256];
 576         int res;
 577         struct sockaddr_un from;
 578         socklen_t fromlen = sizeof(from);
 579
 580         for (;;) {
 581                 wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
 582                            "attach", priv->wpa_s->ifname);
 583                 eloop_wait_for_read_sock(priv->sock);
 584
 585                 res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
 586                                (struct sockaddr *) &from, &fromlen);
 587                 if (res < 0) {
 588                         perror("recvfrom(ctrl_iface)");
 589                         continue;
 590                 }
 591                 buf[res] = '\0';
 592
 593                 if (os_strcmp(buf, "ATTACH") == 0) {
 594                         /* handle ATTACH signal of first monitor interface */
 595                         if (!wpa_supplicant_ctrl_iface_attach(priv, &from,
 596                                                               fromlen)) {
 597                                 sendto(priv->sock, "OK\n", 3, 0,
 598                                        (struct sockaddr *) &from, fromlen);
 599                                 /* OK to continue */
 600                                 return;
 601                         } else {
 602                                 sendto(priv->sock, "FAIL\n", 5, 0,
 603                                        (struct sockaddr *) &from, fromlen);
 604                         }
 605                 } else {
 606                         /* return FAIL for all other signals */
 607                         sendto(priv->sock, "FAIL\n", 5, 0,
 608                                (struct sockaddr *) &from, fromlen);
 609                 }
 610         }
 611 }
 612
 613
 614 /* Global ctrl_iface */
 615
 616 struct ctrl_iface_global_priv {
 617         struct wpa_global *global;
 618         int sock;
 619 };
 620
 621
 622 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
 623                                                      void *sock_ctx)
 624 {
 625         struct wpa_global *global = eloop_ctx;
 626         char buf[256];
 627         int res;
 628         struct sockaddr_un from;
 629         socklen_t fromlen = sizeof(from);
 630         char *reply;
 631         size_t reply_len;
 632
 633         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 634                        (struct sockaddr *) &from, &fromlen);
 635         if (res < 0) {
 636                 perror("recvfrom(ctrl_iface)");
 637                 return;
 638         }
 639         buf[res] = '\0';
 640
 641         reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
 642                                                          &reply_len);
 643
 644         if (reply) {
 645                 sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 646                        fromlen);
 647                 os_free(reply);
 648         } else if (reply_len) {
 649                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 650                        fromlen);
 651         }
 652 }
 653
 654
 655 struct ctrl_iface_global_priv *
 656 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 657 {
 658         struct ctrl_iface_global_priv *priv;
 659         struct sockaddr_un addr;
 660
 661         priv = os_zalloc(sizeof(*priv));
 662         if (priv == NULL)
 663                 return NULL;
 664         priv->global = global;
 665         priv->sock = -1;
 666
 667         if (global->params.ctrl_interface == NULL)
 668                 return priv;
 669
 670 #ifdef ANDROID
 671         priv->sock = android_get_control_socket(global->params.ctrl_interface);
 672         if (priv->sock >= 0)
 673                 goto havesock;
 674 #endif /* ANDROID */
 675
 676         wpa_printf(MSG_DEBUG, "Global control interface '%s'",
 677                    global->params.ctrl_interface);
 678
 679         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 680         if (priv->sock < 0) {
 681                 perror("socket(PF_UNIX)");
 682                 goto fail;
 683         }
 684
 685         os_memset(&addr, 0, sizeof(addr));
 686 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 687         addr.sun_len = sizeof(addr);
 688 #endif /* __FreeBSD__ */
 689         addr.sun_family = AF_UNIX;
 690         os_strlcpy(addr.sun_path, global->params.ctrl_interface,
 691                    sizeof(addr.sun_path));
 692         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 693                 perror("supp-global-ctrl-iface-init (will try fixup): "
 694                        "bind(PF_UNIX)");
 695                 if (connect(priv->sock, (struct sockaddr *) &addr,
 696                             sizeof(addr)) < 0) {
 697                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 698                                    " allow connections - assuming it was left"
 699                                    "over from forced program termination");
 700                         if (unlink(global->params.ctrl_interface) < 0) {
 701                                 perror("unlink[ctrl_iface]");
 702                                 wpa_printf(MSG_ERROR, "Could not unlink "
 703                                            "existing ctrl_iface socket '%s'",
 704                                            global->params.ctrl_interface);
 705                                 goto fail;
 706                         }
 707                         if (bind(priv->sock, (struct sockaddr *) &addr,
 708                                  sizeof(addr)) < 0) {
 709                                 perror("supp-glb-iface-init: bind(PF_UNIX)");
 710                                 goto fail;
 711                         }
 712                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 713                                    "ctrl_iface socket '%s'",
 714                                    global->params.ctrl_interface);
 715                 } else {
 716                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 717                                    "be in use - cannot override it");
 718                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 719                                    "not used anymore",
 720                                    global->params.ctrl_interface);
 721                         goto fail;
 722                 }
 723         }
 724
 725 #ifdef ANDROID
 726 havesock:
 727 #endif /* ANDROID */
 728         eloop_register_read_sock(priv->sock,
 729                                  wpa_supplicant_global_ctrl_iface_receive,
 730                                  global, NULL);
 731
 732         return priv;
 733
 734 fail:
 735         if (priv->sock >= 0)
 736                 close(priv->sock);
 737         os_free(priv);
 738         return NULL;
 739 }
 740
 741
 742 void
 743 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
 744 {
 745         if (priv->sock >= 0) {
 746                 eloop_unregister_read_sock(priv->sock);
 747                 close(priv->sock);
 748         }
 749         if (priv->global->params.ctrl_interface)
 750                 unlink(priv->global->params.ctrl_interface);
 751         os_free(priv);
 752 }