wpa_supplicant/ctrl_iface_unix.c

   1 /*
   2  * WPA Supplicant / UNIX domain socket -based control interface
   3  * Copyright (c) 2004-2014, 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 __linux__
  17 #include <sys/ioctl.h>
  18 #endif /* __linux__ */
  19 #ifdef ANDROID
  20 #include <cutils/sockets.h>
  21 #endif /* ANDROID */
  22
  23 #include "utils/common.h"
  24 #include "utils/eloop.h"
  25 #include "utils/list.h"
  26 #include "common/ctrl_iface_common.h"
  27 #include "eapol_supp/eapol_supp_sm.h"
  28 #include "config.h"
  29 #include "wpa_supplicant_i.h"
  30 #include "ctrl_iface.h"
  31
  32 /* Per-interface ctrl_iface */
  33
  34 struct ctrl_iface_priv {
  35         struct wpa_supplicant *wpa_s;
  36         int sock;
  37         struct dl_list ctrl_dst;
  38         int android_control_socket;
  39         struct dl_list msg_queue;
  40         unsigned int throttle_count;
  41 };
  42
  43
  44 struct ctrl_iface_global_priv {
  45         struct wpa_global *global;
  46         int sock;
  47         struct dl_list ctrl_dst;
  48         int android_control_socket;
  49         struct dl_list msg_queue;
  50         unsigned int throttle_count;
  51 };
  52
  53 struct ctrl_iface_msg {
  54         struct dl_list list;
  55         struct wpa_supplicant *wpa_s;
  56         int level;
  57         enum wpa_msg_type type;
  58         const char *txt;
  59         size_t len;
  60 };
  61
  62
  63 static void wpa_supplicant_ctrl_iface_send(struct wpa_supplicant *wpa_s,
  64                                            const char *ifname, int sock,
  65                                            struct dl_list *ctrl_dst,
  66                                            int level, const char *buf,
  67                                            size_t len,
  68                                            struct ctrl_iface_priv *priv,
  69                                            struct ctrl_iface_global_priv *gp);
  70 static int wpas_ctrl_iface_reinit(struct wpa_supplicant *wpa_s,
  71                                   struct ctrl_iface_priv *priv);
  72 static int wpas_ctrl_iface_global_reinit(struct wpa_global *global,
  73                                          struct ctrl_iface_global_priv *priv);
  74
  75
  76 static void wpas_ctrl_sock_debug(const char *title, int sock, const char *buf,
  77                                  size_t len)
  78 {
  79 #ifdef __linux__
  80         socklen_t optlen;
  81         int sndbuf, outq;
  82         int level = MSG_MSGDUMP;
  83
  84         if (len >= 5 && os_strncmp(buf, "PONG\n", 5) == 0)
  85                 level = MSG_EXCESSIVE;
  86
  87         optlen = sizeof(sndbuf);
  88         sndbuf = 0;
  89         if (getsockopt(sock, SOL_SOCKET, SO_SNDBUF, &sndbuf, &optlen) < 0)
  90                 sndbuf = -1;
  91
  92         if (ioctl(sock, TIOCOUTQ, &outq) < 0)
  93                 outq = -1;
  94
  95         wpa_printf(level,
  96                    "CTRL-DEBUG: %s: sock=%d sndbuf=%d outq=%d send_len=%d",
  97                    title, sock, sndbuf, outq, (int) len);
  98 #endif /* __linux__ */
  99 }
 100
 101
 102 static int wpa_supplicant_ctrl_iface_attach(struct dl_list *ctrl_dst,
 103                                             struct sockaddr_storage *from,
 104                                             socklen_t fromlen, int global)
 105 {
 106         return ctrl_iface_attach(ctrl_dst, from, fromlen, NULL);
 107 }
 108
 109
 110 static int wpa_supplicant_ctrl_iface_detach(struct dl_list *ctrl_dst,
 111                                             struct sockaddr_storage *from,
 112                                             socklen_t fromlen)
 113 {
 114         return ctrl_iface_detach(ctrl_dst, from, fromlen);
 115 }
 116
 117
 118 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
 119                                            struct sockaddr_storage *from,
 120                                            socklen_t fromlen,
 121                                            char *level)
 122 {
 123         wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
 124
 125         return ctrl_iface_level(&priv->ctrl_dst, from, fromlen, level);
 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_storage from;
 137         socklen_t fromlen = sizeof(from);
 138         char *reply = NULL, *reply_buf = 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                 wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
 146                            strerror(errno));
 147                 return;
 148         }
 149         buf[res] = '\0';
 150
 151         if (os_strcmp(buf, "ATTACH") == 0) {
 152                 if (wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst, &from,
 153                                                      fromlen, 0))
 154                         reply_len = 1;
 155                 else {
 156                         new_attached = 1;
 157                         reply_len = 2;
 158                 }
 159         } else if (os_strcmp(buf, "DETACH") == 0) {
 160                 if (wpa_supplicant_ctrl_iface_detach(&priv->ctrl_dst, &from,
 161                                                      fromlen))
 162                         reply_len = 1;
 163                 else
 164                         reply_len = 2;
 165         } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
 166                 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
 167                                                     buf + 6))
 168                         reply_len = 1;
 169                 else
 170                         reply_len = 2;
 171         } else {
 172                 reply_buf = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
 173                                                               &reply_len);
 174                 reply = reply_buf;
 175
 176                 /*
 177                  * There could be some password/key material in the command, so
 178                  * clear the buffer explicitly now that it is not needed
 179                  * anymore.
 180                  */
 181                 os_memset(buf, 0, res);
 182         }
 183
 184         if (!reply && reply_len == 1) {
 185                 reply = "FAIL\n";
 186                 reply_len = 5;
 187         } else if (!reply && reply_len == 2) {
 188                 reply = "OK\n";
 189                 reply_len = 3;
 190         }
 191
 192         if (reply) {
 193                 wpas_ctrl_sock_debug("ctrl_sock-sendto", sock, reply,
 194                                      reply_len);
 195                 if (sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 196                            fromlen) < 0) {
 197                         int _errno = errno;
 198                         wpa_dbg(wpa_s, MSG_DEBUG,
 199                                 "ctrl_iface sendto failed: %d - %s",
 200                                 _errno, strerror(_errno));
 201                         if (_errno == ENOBUFS || _errno == EAGAIN) {
 202                                 /*
 203                                  * The socket send buffer could be full. This
 204                                  * may happen if client programs are not
 205                                  * receiving their pending messages. Close and
 206                                  * reopen the socket as a workaround to avoid
 207                                  * getting stuck being unable to send any new
 208                                  * responses.
 209                                  */
 210                                 sock = wpas_ctrl_iface_reinit(wpa_s, priv);
 211                                 if (sock < 0) {
 212                                         wpa_dbg(wpa_s, MSG_DEBUG, "Failed to reinitialize ctrl_iface socket");
 213                                 }
 214                         }
 215                         if (new_attached) {
 216                                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to send response to ATTACH - detaching");
 217                                 new_attached = 0;
 218                                 wpa_supplicant_ctrl_iface_detach(
 219                                         &priv->ctrl_dst, &from, fromlen);
 220                         }
 221                 }
 222         }
 223         os_free(reply_buf);
 224
 225         if (new_attached)
 226                 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
 227 }
 228
 229
 230 static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 231 {
 232         char *buf;
 233         size_t len;
 234         char *pbuf, *dir = NULL;
 235         int res;
 236
 237         if (wpa_s->conf->ctrl_interface == NULL)
 238                 return NULL;
 239
 240         pbuf = os_strdup(wpa_s->conf->ctrl_interface);
 241         if (pbuf == NULL)
 242                 return NULL;
 243         if (os_strncmp(pbuf, "DIR=", 4) == 0) {
 244                 char *gid_str;
 245                 dir = pbuf + 4;
 246                 gid_str = os_strstr(dir, " GROUP=");
 247                 if (gid_str)
 248                         *gid_str = '\0';
 249         } else
 250                 dir = pbuf;
 251
 252         len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
 253         buf = os_malloc(len);
 254         if (buf == NULL) {
 255                 os_free(pbuf);
 256                 return NULL;
 257         }
 258
 259         res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
 260         if (os_snprintf_error(len, res)) {
 261                 os_free(pbuf);
 262                 os_free(buf);
 263                 return NULL;
 264         }
 265 #ifdef __CYGWIN__
 266         {
 267                 /* Windows/WinPcap uses interface names that are not suitable
 268                  * as a file name - convert invalid chars to underscores */
 269                 char *pos = buf;
 270                 while (*pos) {
 271                         if (*pos == '\\')
 272                                 *pos = '_';
 273                         pos++;
 274                 }
 275         }
 276 #endif /* __CYGWIN__ */
 277         os_free(pbuf);
 278         return buf;
 279 }
 280
 281
 282 static int wpas_ctrl_iface_throttle(int sock)
 283 {
 284 #ifdef __linux__
 285         socklen_t optlen;
 286         int sndbuf, outq;
 287
 288         optlen = sizeof(sndbuf);
 289         sndbuf = 0;
 290         if (getsockopt(sock, SOL_SOCKET, SO_SNDBUF, &sndbuf, &optlen) < 0 ||
 291             ioctl(sock, TIOCOUTQ, &outq) < 0 ||
 292             sndbuf <= 0 || outq < 0)
 293                 return 0;
 294         return outq > sndbuf / 2;
 295 #else /* __linux__ */
 296         return 0;
 297 #endif /* __linux__ */
 298 }
 299
 300
 301 static void wpas_ctrl_msg_send_pending_global(struct wpa_global *global)
 302 {
 303         struct ctrl_iface_global_priv *gpriv;
 304         struct ctrl_iface_msg *msg;
 305
 306         gpriv = global->ctrl_iface;
 307         while (gpriv && !dl_list_empty(&gpriv->msg_queue) &&
 308                !wpas_ctrl_iface_throttle(gpriv->sock)) {
 309                 msg = dl_list_first(&gpriv->msg_queue, struct ctrl_iface_msg,
 310                                     list);
 311                 if (!msg)
 312                         break;
 313                 dl_list_del(&msg->list);
 314                 wpa_supplicant_ctrl_iface_send(
 315                         msg->wpa_s,
 316                         msg->type != WPA_MSG_PER_INTERFACE ?
 317                         NULL : msg->wpa_s->ifname,
 318                         gpriv->sock, &gpriv->ctrl_dst, msg->level,
 319                         msg->txt, msg->len, NULL, gpriv);
 320                 os_free(msg);
 321         }
 322 }
 323
 324
 325 static void wpas_ctrl_msg_send_pending_iface(struct wpa_supplicant *wpa_s)
 326 {
 327         struct ctrl_iface_priv *priv;
 328         struct ctrl_iface_msg *msg;
 329
 330         priv = wpa_s->ctrl_iface;
 331         while (priv && !dl_list_empty(&priv->msg_queue) &&
 332                !wpas_ctrl_iface_throttle(priv->sock)) {
 333                 msg = dl_list_first(&priv->msg_queue, struct ctrl_iface_msg,
 334                                     list);
 335                 if (!msg)
 336                         break;
 337                 dl_list_del(&msg->list);
 338                 wpa_supplicant_ctrl_iface_send(wpa_s, NULL, priv->sock,
 339                                                &priv->ctrl_dst, msg->level,
 340                                                msg->txt, msg->len, priv, NULL);
 341                 os_free(msg);
 342         }
 343 }
 344
 345
 346 static void wpas_ctrl_msg_queue_timeout(void *eloop_ctx, void *timeout_ctx)
 347 {
 348         struct wpa_supplicant *wpa_s = eloop_ctx;
 349         struct ctrl_iface_priv *priv;
 350         struct ctrl_iface_global_priv *gpriv;
 351         int sock = -1, gsock = -1;
 352
 353         wpas_ctrl_msg_send_pending_global(wpa_s->global);
 354         wpas_ctrl_msg_send_pending_iface(wpa_s);
 355
 356         priv = wpa_s->ctrl_iface;
 357         if (priv && !dl_list_empty(&priv->msg_queue))
 358                 sock = priv->sock;
 359
 360         gpriv = wpa_s->global->ctrl_iface;
 361         if (gpriv && !dl_list_empty(&gpriv->msg_queue))
 362                 gsock = gpriv->sock;
 363
 364         if (sock > -1 || gsock > -1) {
 365                 /* Continue pending message transmission from a timeout */
 366                 wpa_printf(MSG_MSGDUMP,
 367                            "CTRL: Had to throttle pending event message transmission for (sock %d gsock %d)",
 368                            sock, gsock);
 369                 eloop_register_timeout(0, 20000, wpas_ctrl_msg_queue_timeout,
 370                                        wpa_s, NULL);
 371         }
 372 }
 373
 374
 375 static void wpas_ctrl_msg_queue(struct dl_list *queue,
 376                                 struct wpa_supplicant *wpa_s, int level,
 377                                 enum wpa_msg_type type,
 378                                 const char *txt, size_t len)
 379 {
 380         struct ctrl_iface_msg *msg;
 381
 382         msg = os_zalloc(sizeof(*msg) + len);
 383         if (!msg)
 384                 return;
 385
 386         msg->wpa_s = wpa_s;
 387         msg->level = level;
 388         msg->type = type;
 389         os_memcpy(msg + 1, txt, len);
 390         msg->txt = (const char *) (msg + 1);
 391         msg->len = len;
 392         dl_list_add_tail(queue, &msg->list);
 393         eloop_cancel_timeout(wpas_ctrl_msg_queue_timeout, wpa_s, NULL);
 394         eloop_register_timeout(0, 0, wpas_ctrl_msg_queue_timeout, wpa_s, NULL);
 395 }
 396
 397
 398 static void wpas_ctrl_msg_queue_limit(unsigned int throttle_count,
 399                                       struct dl_list *queue)
 400 {
 401         struct ctrl_iface_msg *msg;
 402
 403         if (throttle_count < 2000)
 404                 return;
 405
 406         msg = dl_list_first(queue, struct ctrl_iface_msg, list);
 407         if (msg) {
 408                 wpa_printf(MSG_DEBUG, "CTRL: Dropped oldest pending message");
 409                 dl_list_del(&msg->list);
 410                 os_free(msg);
 411         }
 412 }
 413
 414
 415 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
 416                                              enum wpa_msg_type type,
 417                                              const char *txt, size_t len)
 418 {
 419         struct wpa_supplicant *wpa_s = ctx;
 420         struct ctrl_iface_priv *priv;
 421         struct ctrl_iface_global_priv *gpriv;
 422
 423         if (wpa_s == NULL)
 424                 return;
 425
 426         gpriv = wpa_s->global->ctrl_iface;
 427
 428         if (type != WPA_MSG_NO_GLOBAL && gpriv &&
 429             !dl_list_empty(&gpriv->ctrl_dst)) {
 430                 if (!dl_list_empty(&gpriv->msg_queue) ||
 431                     wpas_ctrl_iface_throttle(gpriv->sock)) {
 432                         if (gpriv->throttle_count == 0) {
 433                                 wpa_printf(MSG_MSGDUMP,
 434                                            "CTRL: Had to throttle global event message for sock %d",
 435                                            gpriv->sock);
 436                         }
 437                         gpriv->throttle_count++;
 438                         wpas_ctrl_msg_queue_limit(gpriv->throttle_count,
 439                                                   &gpriv->msg_queue);
 440                         wpas_ctrl_msg_queue(&gpriv->msg_queue, wpa_s, level,
 441                                             type, txt, len);
 442                 } else {
 443                         if (gpriv->throttle_count) {
 444                                 wpa_printf(MSG_MSGDUMP,
 445                                            "CTRL: Had to throttle %u global event message(s) for sock %d",
 446                                            gpriv->throttle_count, gpriv->sock);
 447                         }
 448                         gpriv->throttle_count = 0;
 449                         wpa_supplicant_ctrl_iface_send(
 450                                 wpa_s,
 451                                 type != WPA_MSG_PER_INTERFACE ?
 452                                 NULL : wpa_s->ifname,
 453                                 gpriv->sock, &gpriv->ctrl_dst, level,
 454                                 txt, len, NULL, gpriv);
 455                 }
 456         }
 457
 458         priv = wpa_s->ctrl_iface;
 459
 460         if (type != WPA_MSG_ONLY_GLOBAL && priv) {
 461                 if (!dl_list_empty(&priv->msg_queue) ||
 462                     wpas_ctrl_iface_throttle(priv->sock)) {
 463                         if (priv->throttle_count == 0) {
 464                                 wpa_printf(MSG_MSGDUMP,
 465                                            "CTRL: Had to throttle event message for sock %d",
 466                                            priv->sock);
 467                         }
 468                         priv->throttle_count++;
 469                         wpas_ctrl_msg_queue_limit(priv->throttle_count,
 470                                                   &priv->msg_queue);
 471                         wpas_ctrl_msg_queue(&priv->msg_queue, wpa_s, level,
 472                                             type, txt, len);
 473                 } else {
 474                         if (priv->throttle_count) {
 475                                 wpa_printf(MSG_MSGDUMP,
 476                                            "CTRL: Had to throttle %u event message(s) for sock %d",
 477                                            priv->throttle_count, priv->sock);
 478                         }
 479                         priv->throttle_count = 0;
 480                         wpa_supplicant_ctrl_iface_send(wpa_s, NULL, priv->sock,
 481                                                        &priv->ctrl_dst, level,
 482                                                        txt, len, priv, NULL);
 483                 }
 484         }
 485 }
 486
 487
 488 static int wpas_ctrl_iface_open_sock(struct wpa_supplicant *wpa_s,
 489                                      struct ctrl_iface_priv *priv)
 490 {
 491         struct sockaddr_un addr;
 492         char *fname = NULL;
 493         gid_t gid = 0;
 494         int gid_set = 0;
 495         char *buf, *dir = NULL, *gid_str = NULL;
 496         struct group *grp;
 497         char *endp;
 498         int flags;
 499
 500         buf = os_strdup(wpa_s->conf->ctrl_interface);
 501         if (buf == NULL)
 502                 goto fail;
 503 #ifdef ANDROID
 504         os_snprintf(addr.sun_path, sizeof(addr.sun_path), "wpa_%s",
 505                     wpa_s->conf->ctrl_interface);
 506         priv->sock = android_get_control_socket(addr.sun_path);
 507         if (priv->sock >= 0) {
 508                 priv->android_control_socket = 1;
 509                 goto havesock;
 510         }
 511 #endif /* ANDROID */
 512         if (os_strncmp(buf, "DIR=", 4) == 0) {
 513                 dir = buf + 4;
 514                 gid_str = os_strstr(dir, " GROUP=");
 515                 if (gid_str) {
 516                         *gid_str = '\0';
 517                         gid_str += 7;
 518                 }
 519         } else {
 520                 dir = buf;
 521                 gid_str = wpa_s->conf->ctrl_interface_group;
 522         }
 523
 524         if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
 525                 if (errno == EEXIST) {
 526                         wpa_printf(MSG_DEBUG, "Using existing control "
 527                                    "interface directory.");
 528                 } else {
 529                         wpa_printf(MSG_ERROR, "mkdir[ctrl_interface=%s]: %s",
 530                                    dir, strerror(errno));
 531                         goto fail;
 532                 }
 533         }
 534
 535 #ifdef ANDROID
 536         /*
 537          * wpa_supplicant is started from /init.*.rc on Android and that seems
 538          * to be using umask 0077 which would leave the control interface
 539          * directory without group access. This breaks things since Wi-Fi
 540          * framework assumes that this directory can be accessed by other
 541          * applications in the wifi group. Fix this by adding group access even
 542          * if umask value would prevent this.
 543          */
 544         if (chmod(dir, S_IRWXU | S_IRWXG) < 0) {
 545                 wpa_printf(MSG_ERROR, "CTRL: Could not chmod directory: %s",
 546                            strerror(errno));
 547                 /* Try to continue anyway */
 548         }
 549 #endif /* ANDROID */
 550
 551         if (gid_str) {
 552                 grp = getgrnam(gid_str);
 553                 if (grp) {
 554                         gid = grp->gr_gid;
 555                         gid_set = 1;
 556                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
 557                                    " (from group name '%s')",
 558                                    (int) gid, gid_str);
 559                 } else {
 560                         /* Group name not found - try to parse this as gid */
 561                         gid = strtol(gid_str, &endp, 10);
 562                         if (*gid_str == '\0' || *endp != '\0') {
 563                                 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
 564                                            "'%s'", gid_str);
 565                                 goto fail;
 566                         }
 567                         gid_set = 1;
 568                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
 569                                    (int) gid);
 570                 }
 571         }
 572
 573         if (gid_set && lchown(dir, -1, gid) < 0) {
 574                 wpa_printf(MSG_ERROR, "lchown[ctrl_interface=%s,gid=%d]: %s",
 575                            dir, (int) gid, strerror(errno));
 576                 goto fail;
 577         }
 578
 579         /* Make sure the group can enter and read the directory */
 580         if (gid_set &&
 581             chmod(dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP) < 0) {
 582                 wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
 583                            strerror(errno));
 584                 goto fail;
 585         }
 586
 587         if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
 588             sizeof(addr.sun_path)) {
 589                 wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
 590                 goto fail;
 591         }
 592
 593         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 594         if (priv->sock < 0) {
 595                 wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
 596                 goto fail;
 597         }
 598
 599         os_memset(&addr, 0, sizeof(addr));
 600 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 601         addr.sun_len = sizeof(addr);
 602 #endif /* __FreeBSD__ */
 603         addr.sun_family = AF_UNIX;
 604         fname = wpa_supplicant_ctrl_iface_path(wpa_s);
 605         if (fname == NULL)
 606                 goto fail;
 607         os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
 608         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 609                 wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
 610                            strerror(errno));
 611                 if (connect(priv->sock, (struct sockaddr *) &addr,
 612                             sizeof(addr)) < 0) {
 613                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 614                                    " allow connections - assuming it was left"
 615                                    "over from forced program termination");
 616                         if (unlink(fname) < 0) {
 617                                 wpa_printf(MSG_ERROR,
 618                                            "Could not unlink existing ctrl_iface socket '%s': %s",
 619                                            fname, strerror(errno));
 620                                 goto fail;
 621                         }
 622                         if (bind(priv->sock, (struct sockaddr *) &addr,
 623                                  sizeof(addr)) < 0) {
 624                                 wpa_printf(MSG_ERROR, "supp-ctrl-iface-init: bind(PF_UNIX): %s",
 625                                            strerror(errno));
 626                                 goto fail;
 627                         }
 628                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 629                                    "ctrl_iface socket '%s'", fname);
 630                 } else {
 631                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 632                                    "be in use - cannot override it");
 633                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 634                                    "not used anymore", fname);
 635                         os_free(fname);
 636                         fname = NULL;
 637                         goto fail;
 638                 }
 639         }
 640
 641         if (gid_set && lchown(fname, -1, gid) < 0) {
 642                 wpa_printf(MSG_ERROR, "lchown[ctrl_interface=%s,gid=%d]: %s",
 643                            fname, (int) gid, strerror(errno));
 644                 goto fail;
 645         }
 646
 647         if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
 648                 wpa_printf(MSG_ERROR, "chmod[ctrl_interface=%s]: %s",
 649                            fname, strerror(errno));
 650                 goto fail;
 651         }
 652         os_free(fname);
 653
 654 #ifdef ANDROID
 655 havesock:
 656 #endif /* ANDROID */
 657
 658         /*
 659          * Make socket non-blocking so that we don't hang forever if
 660          * target dies unexpectedly.
 661          */
 662         flags = fcntl(priv->sock, F_GETFL);
 663         if (flags >= 0) {
 664                 flags |= O_NONBLOCK;
 665                 if (fcntl(priv->sock, F_SETFL, flags) < 0) {
 666                         wpa_printf(MSG_INFO, "fcntl(ctrl, O_NONBLOCK): %s",
 667                                    strerror(errno));
 668                         /* Not fatal, continue on.*/
 669                 }
 670         }
 671
 672         eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 673                                  wpa_s, priv);
 674         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 675
 676         os_free(buf);
 677         return 0;
 678
 679 fail:
 680         if (priv->sock >= 0) {
 681                 close(priv->sock);
 682                 priv->sock = -1;
 683         }
 684         if (fname) {
 685                 unlink(fname);
 686                 os_free(fname);
 687         }
 688         os_free(buf);
 689         return -1;
 690 }
 691
 692
 693 struct ctrl_iface_priv *
 694 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 695 {
 696         struct ctrl_iface_priv *priv;
 697
 698         priv = os_zalloc(sizeof(*priv));
 699         if (priv == NULL)
 700                 return NULL;
 701         dl_list_init(&priv->ctrl_dst);
 702         dl_list_init(&priv->msg_queue);
 703         priv->wpa_s = wpa_s;
 704         priv->sock = -1;
 705
 706         if (wpa_s->conf->ctrl_interface == NULL)
 707                 return priv;
 708
 709 #ifdef ANDROID
 710         if (wpa_s->global->params.ctrl_interface) {
 711                 int same = 0;
 712
 713                 if (wpa_s->global->params.ctrl_interface[0] == '/') {
 714                         if (os_strcmp(wpa_s->global->params.ctrl_interface,
 715                                       wpa_s->conf->ctrl_interface) == 0)
 716                                 same = 1;
 717                 } else if (os_strncmp(wpa_s->global->params.ctrl_interface,
 718                                       "@android:", 9) == 0 ||
 719                            os_strncmp(wpa_s->global->params.ctrl_interface,
 720                                       "@abstract:", 10) == 0) {
 721                         char *pos;
 722
 723                         /*
 724                          * Currently, Android uses @android:wpa_* as the naming
 725                          * convention for the global ctrl interface. This logic
 726                          * needs to be revisited if the above naming convention
 727                          * is modified.
 728                          */
 729                         pos = os_strchr(wpa_s->global->params.ctrl_interface,
 730                                         '_');
 731                         if (pos &&
 732                             os_strcmp(pos + 1,
 733                                       wpa_s->conf->ctrl_interface) == 0)
 734                                 same = 1;
 735                 }
 736
 737                 if (same) {
 738                         /*
 739                          * The invalid configuration combination might be
 740                          * possible to hit in an Android OTA upgrade case, so
 741                          * instead of refusing to start the wpa_supplicant
 742                          * process, do not open the per-interface ctrl_iface
 743                          * and continue with the global control interface that
 744                          * was set from the command line since the Wi-Fi
 745                          * framework will use it for operations.
 746                          */
 747                         wpa_printf(MSG_ERROR,
 748                                    "global ctrl interface %s matches ctrl interface %s - do not open per-interface ctrl interface",
 749                                    wpa_s->global->params.ctrl_interface,
 750                                    wpa_s->conf->ctrl_interface);
 751                         return priv;
 752                 }
 753         }
 754 #endif /* ANDROID */
 755
 756         if (wpas_ctrl_iface_open_sock(wpa_s, priv) < 0) {
 757                 os_free(priv);
 758                 return NULL;
 759         }
 760
 761         return priv;
 762 }
 763
 764
 765 static int wpas_ctrl_iface_reinit(struct wpa_supplicant *wpa_s,
 766                                   struct ctrl_iface_priv *priv)
 767 {
 768         int res;
 769
 770         if (priv->sock <= 0)
 771                 return -1;
 772
 773         /*
 774          * On Android, the control socket being used may be the socket
 775          * that is created when wpa_supplicant is started as a /init.*.rc
 776          * service. Such a socket is maintained as a key-value pair in
 777          * Android's environment. Closing this control socket would leave us
 778          * in a bad state with an invalid socket descriptor.
 779          */
 780         if (priv->android_control_socket)
 781                 return priv->sock;
 782
 783         eloop_unregister_read_sock(priv->sock);
 784         close(priv->sock);
 785         priv->sock = -1;
 786         res = wpas_ctrl_iface_open_sock(wpa_s, priv);
 787         if (res < 0)
 788                 return -1;
 789         return priv->sock;
 790 }
 791
 792
 793 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 794 {
 795         struct wpa_ctrl_dst *dst, *prev;
 796         struct ctrl_iface_msg *msg, *prev_msg;
 797         struct ctrl_iface_global_priv *gpriv;
 798
 799         if (priv->sock > -1) {
 800                 char *fname;
 801                 char *buf, *dir = NULL;
 802                 eloop_unregister_read_sock(priv->sock);
 803                 if (!dl_list_empty(&priv->ctrl_dst)) {
 804                         /*
 805                          * Wait before closing the control socket if
 806                          * there are any attached monitors in order to allow
 807                          * them to receive any pending messages.
 808                          */
 809                         wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 810                                    "monitors to receive messages");
 811                         os_sleep(0, 100000);
 812                 }
 813                 close(priv->sock);
 814                 priv->sock = -1;
 815                 fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
 816                 if (fname) {
 817                         unlink(fname);
 818                         os_free(fname);
 819                 }
 820
 821                 if (priv->wpa_s->conf->ctrl_interface == NULL)
 822                         goto free_dst;
 823                 buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
 824                 if (buf == NULL)
 825                         goto free_dst;
 826                 if (os_strncmp(buf, "DIR=", 4) == 0) {
 827                         char *gid_str;
 828                         dir = buf + 4;
 829                         gid_str = os_strstr(dir, " GROUP=");
 830                         if (gid_str)
 831                                 *gid_str = '\0';
 832                 } else
 833                         dir = buf;
 834
 835                 if (rmdir(dir) < 0) {
 836                         if (errno == ENOTEMPTY) {
 837                                 wpa_printf(MSG_DEBUG, "Control interface "
 838                                            "directory not empty - leaving it "
 839                                            "behind");
 840                         } else {
 841                                 wpa_printf(MSG_ERROR,
 842                                            "rmdir[ctrl_interface=%s]: %s",
 843                                            dir, strerror(errno));
 844                         }
 845                 }
 846                 os_free(buf);
 847         }
 848
 849 free_dst:
 850         dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
 851                               list) {
 852                 dl_list_del(&dst->list);
 853                 os_free(dst);
 854         }
 855         dl_list_for_each_safe(msg, prev_msg, &priv->msg_queue,
 856                               struct ctrl_iface_msg, list) {
 857                 dl_list_del(&msg->list);
 858                 os_free(msg);
 859         }
 860         gpriv = priv->wpa_s->global->ctrl_iface;
 861         if (gpriv) {
 862                 dl_list_for_each_safe(msg, prev_msg, &gpriv->msg_queue,
 863                                       struct ctrl_iface_msg, list) {
 864                         if (msg->wpa_s == priv->wpa_s) {
 865                                 dl_list_del(&msg->list);
 866                                 os_free(msg);
 867                         }
 868                 }
 869         }
 870         eloop_cancel_timeout(wpas_ctrl_msg_queue_timeout, priv->wpa_s, NULL);
 871         os_free(priv);
 872 }
 873
 874
 875 /**
 876  * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
 877  * @ifname: Interface name for global control socket or %NULL
 878  * @sock: Local socket fd
 879  * @ctrl_dst: List of attached listeners
 880  * @level: Priority level of the message
 881  * @buf: Message data
 882  * @len: Message length
 883  *
 884  * Send a packet to all monitor programs attached to the control interface.
 885  */
 886 static void wpa_supplicant_ctrl_iface_send(struct wpa_supplicant *wpa_s,
 887                                            const char *ifname, int sock,
 888                                            struct dl_list *ctrl_dst,
 889                                            int level, const char *buf,
 890                                            size_t len,
 891                                            struct ctrl_iface_priv *priv,
 892                                            struct ctrl_iface_global_priv *gp)
 893 {
 894         struct wpa_ctrl_dst *dst, *next;
 895         char levelstr[10];
 896         int idx, res;
 897         struct msghdr msg;
 898         struct iovec io[5];
 899
 900         if (sock < 0 || dl_list_empty(ctrl_dst))
 901                 return;
 902
 903         res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 904         if (os_snprintf_error(sizeof(levelstr), res))
 905                 return;
 906         idx = 0;
 907         if (ifname) {
 908                 io[idx].iov_base = "IFNAME=";
 909                 io[idx].iov_len = 7;
 910                 idx++;
 911                 io[idx].iov_base = (char *) ifname;
 912                 io[idx].iov_len = os_strlen(ifname);
 913                 idx++;
 914                 io[idx].iov_base = " ";
 915                 io[idx].iov_len = 1;
 916                 idx++;
 917         }
 918         io[idx].iov_base = levelstr;
 919         io[idx].iov_len = os_strlen(levelstr);
 920         idx++;
 921         io[idx].iov_base = (char *) buf;
 922         io[idx].iov_len = len;
 923         idx++;
 924         os_memset(&msg, 0, sizeof(msg));
 925         msg.msg_iov = io;
 926         msg.msg_iovlen = idx;
 927
 928         dl_list_for_each_safe(dst, next, ctrl_dst, struct wpa_ctrl_dst, list) {
 929                 int _errno;
 930                 char txt[200];
 931
 932                 if (level < dst->debug_level)
 933                         continue;
 934
 935                 msg.msg_name = (void *) &dst->addr;
 936                 msg.msg_namelen = dst->addrlen;
 937                 wpas_ctrl_sock_debug("ctrl_sock-sendmsg", sock, buf, len);
 938                 if (sendmsg(sock, &msg, MSG_DONTWAIT) >= 0) {
 939                         sockaddr_print(MSG_MSGDUMP,
 940                                        "CTRL_IFACE monitor sent successfully to",
 941                                        &dst->addr, dst->addrlen);
 942                         dst->errors = 0;
 943                         continue;
 944                 }
 945
 946                 _errno = errno;
 947                 os_snprintf(txt, sizeof(txt), "CTRL_IFACE monitor: %d (%s) for",
 948                             _errno, strerror(_errno));
 949                 sockaddr_print(MSG_DEBUG, txt, &dst->addr, dst->addrlen);
 950                 dst->errors++;
 951
 952                 if (dst->errors > 10 || _errno == ENOENT || _errno == EPERM) {
 953                         sockaddr_print(MSG_INFO, "CTRL_IFACE: Detach monitor that cannot receive messages:",
 954                                        &dst->addr, dst->addrlen);
 955                         wpa_supplicant_ctrl_iface_detach(ctrl_dst, &dst->addr,
 956                                                          dst->addrlen);
 957                 }
 958
 959                 if (_errno == ENOBUFS || _errno == EAGAIN) {
 960                         /*
 961                          * The socket send buffer could be full. This may happen
 962                          * if client programs are not receiving their pending
 963                          * messages. Close and reopen the socket as a workaround
 964                          * to avoid getting stuck being unable to send any new
 965                          * responses.
 966                          */
 967                         if (priv)
 968                                 sock = wpas_ctrl_iface_reinit(wpa_s, priv);
 969                         else if (gp)
 970                                 sock = wpas_ctrl_iface_global_reinit(
 971                                         wpa_s->global, gp);
 972                         else
 973                                 break;
 974                         if (sock < 0) {
 975                                 wpa_dbg(wpa_s, MSG_DEBUG,
 976                                         "Failed to reinitialize ctrl_iface socket");
 977                                 break;
 978                         }
 979                 }
 980         }
 981 }
 982
 983
 984 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 985 {
 986         char buf[256];
 987         int res;
 988         struct sockaddr_storage from;
 989         socklen_t fromlen = sizeof(from);
 990
 991         if (priv->sock == -1)
 992                 return;
 993
 994         for (;;) {
 995                 wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
 996                            "attach", priv->wpa_s->ifname);
 997                 eloop_wait_for_read_sock(priv->sock);
 998
 999                 res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
1000                                (struct sockaddr *) &from, &fromlen);
1001                 if (res < 0) {
1002                         wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
1003                                    strerror(errno));
1004                         continue;
1005                 }
1006                 buf[res] = '\0';
1007
1008                 if (os_strcmp(buf, "ATTACH") == 0) {
1009                         /* handle ATTACH signal of first monitor interface */
1010                         if (!wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst,
1011                                                               &from, fromlen,
1012                                                               0)) {
1013                                 if (sendto(priv->sock, "OK\n", 3, 0,
1014                                            (struct sockaddr *) &from, fromlen) <
1015                                     0) {
1016                                         wpa_printf(MSG_DEBUG, "ctrl_iface sendto failed: %s",
1017                                                    strerror(errno));
1018                                 }
1019                                 /* OK to continue */
1020                                 return;
1021                         } else {
1022                                 if (sendto(priv->sock, "FAIL\n", 5, 0,
1023                                            (struct sockaddr *) &from, fromlen) <
1024                                     0) {
1025                                         wpa_printf(MSG_DEBUG, "ctrl_iface sendto failed: %s",
1026                                                    strerror(errno));
1027                                 }
1028                         }
1029                 } else {
1030                         /* return FAIL for all other signals */
1031                         if (sendto(priv->sock, "FAIL\n", 5, 0,
1032                                    (struct sockaddr *) &from, fromlen) < 0) {
1033                                 wpa_printf(MSG_DEBUG,
1034                                            "ctrl_iface sendto failed: %s",
1035                                            strerror(errno));
1036                         }
1037                 }
1038         }
1039 }
1040
1041
1042 /* Global ctrl_iface */
1043
1044 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
1045                                                      void *sock_ctx)
1046 {
1047         struct wpa_global *global = eloop_ctx;
1048         struct ctrl_iface_global_priv *priv = sock_ctx;
1049         char buf[4096];
1050         int res;
1051         struct sockaddr_storage from;
1052         socklen_t fromlen = sizeof(from);
1053         char *reply = NULL, *reply_buf = NULL;
1054         size_t reply_len;
1055
1056         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
1057                        (struct sockaddr *) &from, &fromlen);
1058         if (res < 0) {
1059                 wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
1060                            strerror(errno));
1061                 return;
1062         }
1063         buf[res] = '\0';
1064
1065         if (os_strcmp(buf, "ATTACH") == 0) {
1066                 if (wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst, &from,
1067                                                      fromlen, 1))
1068                         reply_len = 1;
1069                 else
1070                         reply_len = 2;
1071         } else if (os_strcmp(buf, "DETACH") == 0) {
1072                 if (wpa_supplicant_ctrl_iface_detach(&priv->ctrl_dst, &from,
1073                                                      fromlen))
1074                         reply_len = 1;
1075                 else
1076                         reply_len = 2;
1077         } else {
1078                 reply_buf = wpa_supplicant_global_ctrl_iface_process(
1079                         global, buf, &reply_len);
1080                 reply = reply_buf;
1081
1082                 /*
1083                  * There could be some password/key material in the command, so
1084                  * clear the buffer explicitly now that it is not needed
1085                  * anymore.
1086                  */
1087                 os_memset(buf, 0, res);
1088         }
1089
1090         if (!reply && reply_len == 1) {
1091                 reply = "FAIL\n";
1092                 reply_len = 5;
1093         } else if (!reply && reply_len == 2) {
1094                 reply = "OK\n";
1095                 reply_len = 3;
1096         }
1097
1098         if (reply) {
1099                 wpas_ctrl_sock_debug("global_ctrl_sock-sendto",
1100                                      sock, reply, reply_len);
1101                 if (sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
1102                            fromlen) < 0) {
1103                         wpa_printf(MSG_DEBUG, "ctrl_iface sendto failed: %s",
1104                                 strerror(errno));
1105                 }
1106         }
1107         os_free(reply_buf);
1108 }
1109
1110
1111 static int wpas_global_ctrl_iface_open_sock(struct wpa_global *global,
1112                                             struct ctrl_iface_global_priv *priv)
1113 {
1114         struct sockaddr_un addr;
1115         const char *ctrl = global->params.ctrl_interface;
1116         int flags;
1117
1118         wpa_printf(MSG_DEBUG, "Global control interface '%s'", ctrl);
1119
1120 #ifdef ANDROID
1121         if (os_strncmp(ctrl, "@android:", 9) == 0) {
1122                 priv->sock = android_get_control_socket(ctrl + 9);
1123                 if (priv->sock < 0) {
1124                         wpa_printf(MSG_ERROR, "Failed to open Android control "
1125                                    "socket '%s'", ctrl + 9);
1126                         goto fail;
1127                 }
1128                 wpa_printf(MSG_DEBUG, "Using Android control socket '%s'",
1129                            ctrl + 9);
1130                 priv->android_control_socket = 1;
1131                 goto havesock;
1132         }
1133
1134         if (os_strncmp(ctrl, "@abstract:", 10) != 0) {
1135                 /*
1136                  * Backwards compatibility - try to open an Android control
1137                  * socket and if that fails, assume this was a UNIX domain
1138                  * socket instead.
1139                  */
1140                 priv->sock = android_get_control_socket(ctrl);
1141                 if (priv->sock >= 0) {
1142                         wpa_printf(MSG_DEBUG,
1143                                    "Using Android control socket '%s'",
1144                                    ctrl);
1145                         priv->android_control_socket = 1;
1146                         goto havesock;
1147                 }
1148         }
1149 #endif /* ANDROID */
1150
1151         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
1152         if (priv->sock < 0) {
1153                 wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
1154                 goto fail;
1155         }
1156
1157         os_memset(&addr, 0, sizeof(addr));
1158 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1159         addr.sun_len = sizeof(addr);
1160 #endif /* __FreeBSD__ */
1161         addr.sun_family = AF_UNIX;
1162
1163         if (os_strncmp(ctrl, "@abstract:", 10) == 0) {
1164                 addr.sun_path[0] = '\0';
1165                 os_strlcpy(addr.sun_path + 1, ctrl + 10,
1166                            sizeof(addr.sun_path) - 1);
1167                 if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) <
1168                     0) {
1169                         wpa_printf(MSG_ERROR, "supp-global-ctrl-iface-init: "
1170                                    "bind(PF_UNIX;%s) failed: %s",
1171                                    ctrl, strerror(errno));
1172                         goto fail;
1173                 }
1174                 wpa_printf(MSG_DEBUG, "Using Abstract control socket '%s'",
1175                            ctrl + 10);
1176                 goto havesock;
1177         }
1178
1179         os_strlcpy(addr.sun_path, ctrl, sizeof(addr.sun_path));
1180         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
1181                 wpa_printf(MSG_INFO, "supp-global-ctrl-iface-init(%s) (will try fixup): bind(PF_UNIX): %s",
1182                            ctrl, strerror(errno));
1183                 if (connect(priv->sock, (struct sockaddr *) &addr,
1184                             sizeof(addr)) < 0) {
1185                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
1186                                    " allow connections - assuming it was left"
1187                                    "over from forced program termination");
1188                         if (unlink(ctrl) < 0) {
1189                                 wpa_printf(MSG_ERROR,
1190                                            "Could not unlink existing ctrl_iface socket '%s': %s",
1191                                            ctrl, strerror(errno));
1192                                 goto fail;
1193                         }
1194                         if (bind(priv->sock, (struct sockaddr *) &addr,
1195                                  sizeof(addr)) < 0) {
1196                                 wpa_printf(MSG_ERROR, "supp-glb-iface-init: bind(PF_UNIX;%s): %s",
1197                                            ctrl, strerror(errno));
1198                                 goto fail;
1199                         }
1200                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
1201                                    "ctrl_iface socket '%s'",
1202                                    ctrl);
1203                 } else {
1204                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
1205                                    "be in use - cannot override it");
1206                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
1207                                    "not used anymore",
1208                                    ctrl);
1209                         goto fail;
1210                 }
1211         }
1212
1213         wpa_printf(MSG_DEBUG, "Using UNIX control socket '%s'", ctrl);
1214
1215         if (global->params.ctrl_interface_group) {
1216                 char *gid_str = global->params.ctrl_interface_group;
1217                 gid_t gid = 0;
1218                 struct group *grp;
1219                 char *endp;
1220
1221                 grp = getgrnam(gid_str);
1222                 if (grp) {
1223                         gid = grp->gr_gid;
1224                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
1225                                    " (from group name '%s')",
1226                                    (int) gid, gid_str);
1227                 } else {
1228                         /* Group name not found - try to parse this as gid */
1229                         gid = strtol(gid_str, &endp, 10);
1230                         if (*gid_str == '\0' || *endp != '\0') {
1231                                 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
1232                                            "'%s'", gid_str);
1233                                 goto fail;
1234                         }
1235                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
1236                                    (int) gid);
1237                 }
1238                 if (lchown(ctrl, -1, gid) < 0) {
1239                         wpa_printf(MSG_ERROR,
1240                                    "lchown[global_ctrl_interface=%s,gid=%d]: %s",
1241                                    ctrl, (int) gid, strerror(errno));
1242                         goto fail;
1243                 }
1244
1245                 if (chmod(ctrl, S_IRWXU | S_IRWXG) < 0) {
1246                         wpa_printf(MSG_ERROR,
1247                                    "chmod[global_ctrl_interface=%s]: %s",
1248                                    ctrl, strerror(errno));
1249                         goto fail;
1250                 }
1251         } else {
1252                 if (chmod(ctrl, S_IRWXU) < 0) {
1253                         wpa_printf(MSG_DEBUG,
1254                                    "chmod[global_ctrl_interface=%s](S_IRWXU): %s",
1255                                    ctrl, strerror(errno));
1256                         /* continue anyway since group change was not required
1257                          */
1258                 }
1259         }
1260
1261 havesock:
1262
1263         /*
1264          * Make socket non-blocking so that we don't hang forever if
1265          * target dies unexpectedly.
1266          */
1267         flags = fcntl(priv->sock, F_GETFL);
1268         if (flags >= 0) {
1269                 flags |= O_NONBLOCK;
1270                 if (fcntl(priv->sock, F_SETFL, flags) < 0) {
1271                         wpa_printf(MSG_INFO, "fcntl(ctrl, O_NONBLOCK): %s",
1272                                    strerror(errno));
1273                         /* Not fatal, continue on.*/
1274                 }
1275         }
1276
1277         eloop_register_read_sock(priv->sock,
1278                                  wpa_supplicant_global_ctrl_iface_receive,
1279                                  global, priv);
1280
1281         return 0;
1282
1283 fail:
1284         if (priv->sock >= 0) {
1285                 close(priv->sock);
1286                 priv->sock = -1;
1287         }
1288         return -1;
1289 }
1290
1291
1292 struct ctrl_iface_global_priv *
1293 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
1294 {
1295         struct ctrl_iface_global_priv *priv;
1296
1297         priv = os_zalloc(sizeof(*priv));
1298         if (priv == NULL)
1299                 return NULL;
1300         dl_list_init(&priv->ctrl_dst);
1301         dl_list_init(&priv->msg_queue);
1302         priv->global = global;
1303         priv->sock = -1;
1304
1305         if (global->params.ctrl_interface == NULL)
1306                 return priv;
1307
1308         if (wpas_global_ctrl_iface_open_sock(global, priv) < 0) {
1309                 os_free(priv);
1310                 return NULL;
1311         }
1312
1313         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
1314
1315         return priv;
1316 }
1317
1318
1319 static int wpas_ctrl_iface_global_reinit(struct wpa_global *global,
1320                                          struct ctrl_iface_global_priv *priv)
1321 {
1322         int res;
1323
1324         if (priv->sock <= 0)
1325                 return -1;
1326
1327         /*
1328          * On Android, the control socket being used may be the socket
1329          * that is created when wpa_supplicant is started as a /init.*.rc
1330          * service. Such a socket is maintained as a key-value pair in
1331          * Android's environment. Closing this control socket would leave us
1332          * in a bad state with an invalid socket descriptor.
1333          */
1334         if (priv->android_control_socket)
1335                 return priv->sock;
1336
1337         eloop_unregister_read_sock(priv->sock);
1338         close(priv->sock);
1339         priv->sock = -1;
1340         res = wpas_global_ctrl_iface_open_sock(global, priv);
1341         if (res < 0)
1342                 return -1;
1343         return priv->sock;
1344 }
1345
1346
1347 void
1348 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
1349 {
1350         struct wpa_ctrl_dst *dst, *prev;
1351         struct ctrl_iface_msg *msg, *prev_msg;
1352
1353         if (priv->sock >= 0) {
1354                 eloop_unregister_read_sock(priv->sock);
1355                 close(priv->sock);
1356         }
1357         if (priv->global->params.ctrl_interface)
1358                 unlink(priv->global->params.ctrl_interface);
1359         dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
1360                               list) {
1361                 dl_list_del(&dst->list);
1362                 os_free(dst);
1363         }
1364         dl_list_for_each_safe(msg, prev_msg, &priv->msg_queue,
1365                               struct ctrl_iface_msg, list) {
1366                 dl_list_del(&msg->list);
1367                 os_free(msg);
1368         }
1369         os_free(priv);
1370 }