contrib/wpa_supplicant/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 ANDROID
  17 #include <cutils/sockets.h>
  18 #endif /* ANDROID */
  19
  20 #include "utils/common.h"
  21 #include "utils/eloop.h"
  22 #include "utils/list.h"
  23 #include "eapol_supp/eapol_supp_sm.h"
  24 #include "config.h"
  25 #include "wpa_supplicant_i.h"
  26 #include "ctrl_iface.h"
  27
  28 /* Per-interface ctrl_iface */
  29
  30 /**
  31  * struct wpa_ctrl_dst - Internal data structure of control interface monitors
  32  *
  33  * This structure is used to store information about registered control
  34  * interface monitors into struct wpa_supplicant. This data is private to
  35  * ctrl_iface_unix.c and should not be touched directly from other files.
  36  */
  37 struct wpa_ctrl_dst {
  38         struct dl_list list;
  39         struct sockaddr_un addr;
  40         socklen_t addrlen;
  41         int debug_level;
  42         int errors;
  43 };
  44
  45
  46 struct ctrl_iface_priv {
  47         struct wpa_supplicant *wpa_s;
  48         int sock;
  49         struct dl_list ctrl_dst;
  50 };
  51
  52
  53 struct ctrl_iface_global_priv {
  54         struct wpa_global *global;
  55         int sock;
  56         struct dl_list ctrl_dst;
  57 };
  58
  59
  60 static void wpa_supplicant_ctrl_iface_send(struct wpa_supplicant *wpa_s,
  61                                            const char *ifname, int sock,
  62                                            struct dl_list *ctrl_dst,
  63                                            int level, const char *buf,
  64                                            size_t len,
  65                                            struct ctrl_iface_priv *priv,
  66                                            struct ctrl_iface_global_priv *gp);
  67 static int wpas_ctrl_iface_reinit(struct wpa_supplicant *wpa_s,
  68                                   struct ctrl_iface_priv *priv);
  69 static int wpas_ctrl_iface_global_reinit(struct wpa_global *global,
  70                                          struct ctrl_iface_global_priv *priv);
  71
  72
  73 static int wpa_supplicant_ctrl_iface_attach(struct dl_list *ctrl_dst,
  74                                             struct sockaddr_un *from,
  75                                             socklen_t fromlen)
  76 {
  77         struct wpa_ctrl_dst *dst;
  78         char addr_txt[200];
  79
  80         dst = os_zalloc(sizeof(*dst));
  81         if (dst == NULL)
  82                 return -1;
  83         os_memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
  84         dst->addrlen = fromlen;
  85         dst->debug_level = MSG_INFO;
  86         dl_list_add(ctrl_dst, &dst->list);
  87         printf_encode(addr_txt, sizeof(addr_txt),
  88                       (u8 *) from->sun_path,
  89                       fromlen - offsetof(struct sockaddr_un, sun_path));
  90         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor attached %s", addr_txt);
  91         return 0;
  92 }
  93
  94
  95 static int wpa_supplicant_ctrl_iface_detach(struct dl_list *ctrl_dst,
  96                                             struct sockaddr_un *from,
  97                                             socklen_t fromlen)
  98 {
  99         struct wpa_ctrl_dst *dst;
 100
 101         dl_list_for_each(dst, ctrl_dst, struct wpa_ctrl_dst, list) {
 102                 if (fromlen == dst->addrlen &&
 103                     os_memcmp(from->sun_path, dst->addr.sun_path,
 104                               fromlen - offsetof(struct sockaddr_un, sun_path))
 105                     == 0) {
 106                         char addr_txt[200];
 107                         printf_encode(addr_txt, sizeof(addr_txt),
 108                                       (u8 *) from->sun_path,
 109                                       fromlen -
 110                                       offsetof(struct sockaddr_un, sun_path));
 111                         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached %s",
 112                                    addr_txt);
 113                         dl_list_del(&dst->list);
 114                         os_free(dst);
 115                         return 0;
 116                 }
 117         }
 118         return -1;
 119 }
 120
 121
 122 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
 123                                            struct sockaddr_un *from,
 124                                            socklen_t fromlen,
 125                                            char *level)
 126 {
 127         struct wpa_ctrl_dst *dst;
 128
 129         wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
 130
 131         dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
 132                 if (fromlen == dst->addrlen &&
 133                     os_memcmp(from->sun_path, dst->addr.sun_path,
 134                               fromlen - offsetof(struct sockaddr_un, sun_path))
 135                     == 0) {
 136                         char addr_txt[200];
 137                         dst->debug_level = atoi(level);
 138                         printf_encode(addr_txt, sizeof(addr_txt),
 139                                       (u8 *) from->sun_path, fromlen -
 140                                       offsetof(struct sockaddr_un, sun_path));
 141                         wpa_printf(MSG_DEBUG, "CTRL_IFACE changed monitor level to %d for %s",
 142                                    dst->debug_level, addr_txt);
 143                         return 0;
 144                 }
 145         }
 146
 147         return -1;
 148 }
 149
 150
 151 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
 152                                               void *sock_ctx)
 153 {
 154         struct wpa_supplicant *wpa_s = eloop_ctx;
 155         struct ctrl_iface_priv *priv = sock_ctx;
 156         char buf[4096];
 157         int res;
 158         struct sockaddr_un from;
 159         socklen_t fromlen = sizeof(from);
 160         char *reply = NULL, *reply_buf = NULL;
 161         size_t reply_len = 0;
 162         int new_attached = 0;
 163
 164         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 165                        (struct sockaddr *) &from, &fromlen);
 166         if (res < 0) {
 167                 wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
 168                            strerror(errno));
 169                 return;
 170         }
 171         buf[res] = '\0';
 172
 173         if (os_strcmp(buf, "ATTACH") == 0) {
 174                 if (wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst, &from,
 175                                                      fromlen))
 176                         reply_len = 1;
 177                 else {
 178                         new_attached = 1;
 179                         reply_len = 2;
 180                 }
 181         } else if (os_strcmp(buf, "DETACH") == 0) {
 182                 if (wpa_supplicant_ctrl_iface_detach(&priv->ctrl_dst, &from,
 183                                                      fromlen))
 184                         reply_len = 1;
 185                 else
 186                         reply_len = 2;
 187         } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
 188                 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
 189                                                     buf + 6))
 190                         reply_len = 1;
 191                 else
 192                         reply_len = 2;
 193         } else {
 194                 reply_buf = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
 195                                                               &reply_len);
 196                 reply = reply_buf;
 197         }
 198
 199         if (!reply && reply_len == 1) {
 200                 reply = "FAIL\n";
 201                 reply_len = 5;
 202         } else if (!reply && reply_len == 2) {
 203                 reply = "OK\n";
 204                 reply_len = 3;
 205         }
 206
 207         if (reply) {
 208                 if (sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 209                            fromlen) < 0) {
 210                         int _errno = errno;
 211                         wpa_dbg(wpa_s, MSG_DEBUG,
 212                                 "ctrl_iface sendto failed: %d - %s",
 213                                 _errno, strerror(_errno));
 214                         if (_errno == ENOBUFS || _errno == EAGAIN) {
 215                                 /*
 216                                  * The socket send buffer could be full. This
 217                                  * may happen if client programs are not
 218                                  * receiving their pending messages. Close and
 219                                  * reopen the socket as a workaround to avoid
 220                                  * getting stuck being unable to send any new
 221                                  * responses.
 222                                  */
 223                                 sock = wpas_ctrl_iface_reinit(wpa_s, priv);
 224                                 if (sock < 0) {
 225                                         wpa_dbg(wpa_s, MSG_DEBUG, "Failed to reinitialize ctrl_iface socket");
 226                                 }
 227                         }
 228                         if (new_attached) {
 229                                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to send response to ATTACH - detaching");
 230                                 new_attached = 0;
 231                                 wpa_supplicant_ctrl_iface_detach(
 232                                         &priv->ctrl_dst, &from, fromlen);
 233                         }
 234                 }
 235         }
 236         os_free(reply_buf);
 237
 238         if (new_attached)
 239                 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
 240 }
 241
 242
 243 static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 244 {
 245         char *buf;
 246         size_t len;
 247         char *pbuf, *dir = NULL, *gid_str = NULL;
 248         int res;
 249
 250         if (wpa_s->conf->ctrl_interface == NULL)
 251                 return NULL;
 252
 253         pbuf = os_strdup(wpa_s->conf->ctrl_interface);
 254         if (pbuf == NULL)
 255                 return NULL;
 256         if (os_strncmp(pbuf, "DIR=", 4) == 0) {
 257                 dir = pbuf + 4;
 258                 gid_str = os_strstr(dir, " GROUP=");
 259                 if (gid_str) {
 260                         *gid_str = '\0';
 261                         gid_str += 7;
 262                 }
 263         } else
 264                 dir = pbuf;
 265
 266         len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
 267         buf = os_malloc(len);
 268         if (buf == NULL) {
 269                 os_free(pbuf);
 270                 return NULL;
 271         }
 272
 273         res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
 274         if (res < 0 || (size_t) res >= len) {
 275                 os_free(pbuf);
 276                 os_free(buf);
 277                 return NULL;
 278         }
 279 #ifdef __CYGWIN__
 280         {
 281                 /* Windows/WinPcap uses interface names that are not suitable
 282                  * as a file name - convert invalid chars to underscores */
 283                 char *pos = buf;
 284                 while (*pos) {
 285                         if (*pos == '\\')
 286                                 *pos = '_';
 287                         pos++;
 288                 }
 289         }
 290 #endif /* __CYGWIN__ */
 291         os_free(pbuf);
 292         return buf;
 293 }
 294
 295
 296 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level, int global,
 297                                              const char *txt, size_t len)
 298 {
 299         struct wpa_supplicant *wpa_s = ctx;
 300
 301         if (wpa_s == NULL)
 302                 return;
 303
 304         if (global != 2 && wpa_s->global->ctrl_iface) {
 305                 struct ctrl_iface_global_priv *priv = wpa_s->global->ctrl_iface;
 306                 if (!dl_list_empty(&priv->ctrl_dst)) {
 307                         wpa_supplicant_ctrl_iface_send(wpa_s, global ? NULL :
 308                                                        wpa_s->ifname,
 309                                                        priv->sock,
 310                                                        &priv->ctrl_dst,
 311                                                        level, txt, len, NULL,
 312                                                        priv);
 313                 }
 314         }
 315
 316         if (wpa_s->ctrl_iface == NULL)
 317                 return;
 318         wpa_supplicant_ctrl_iface_send(wpa_s, NULL, wpa_s->ctrl_iface->sock,
 319                                        &wpa_s->ctrl_iface->ctrl_dst,
 320                                        level, txt, len, wpa_s->ctrl_iface,
 321                                        NULL);
 322 }
 323
 324
 325 static int wpas_ctrl_iface_open_sock(struct wpa_supplicant *wpa_s,
 326                                      struct ctrl_iface_priv *priv)
 327 {
 328         struct sockaddr_un addr;
 329         char *fname = NULL;
 330         gid_t gid = 0;
 331         int gid_set = 0;
 332         char *buf, *dir = NULL, *gid_str = NULL;
 333         struct group *grp;
 334         char *endp;
 335         int flags;
 336
 337         buf = os_strdup(wpa_s->conf->ctrl_interface);
 338         if (buf == NULL)
 339                 goto fail;
 340 #ifdef ANDROID
 341         os_snprintf(addr.sun_path, sizeof(addr.sun_path), "wpa_%s",
 342                     wpa_s->conf->ctrl_interface);
 343         priv->sock = android_get_control_socket(addr.sun_path);
 344         if (priv->sock >= 0)
 345                 goto havesock;
 346 #endif /* ANDROID */
 347         if (os_strncmp(buf, "DIR=", 4) == 0) {
 348                 dir = buf + 4;
 349                 gid_str = os_strstr(dir, " GROUP=");
 350                 if (gid_str) {
 351                         *gid_str = '\0';
 352                         gid_str += 7;
 353                 }
 354         } else {
 355                 dir = buf;
 356                 gid_str = wpa_s->conf->ctrl_interface_group;
 357         }
 358
 359         if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
 360                 if (errno == EEXIST) {
 361                         wpa_printf(MSG_DEBUG, "Using existing control "
 362                                    "interface directory.");
 363                 } else {
 364                         wpa_printf(MSG_ERROR, "mkdir[ctrl_interface=%s]: %s",
 365                                    dir, strerror(errno));
 366                         goto fail;
 367                 }
 368         }
 369
 370 #ifdef ANDROID
 371         /*
 372          * wpa_supplicant is started from /init.*.rc on Android and that seems
 373          * to be using umask 0077 which would leave the control interface
 374          * directory without group access. This breaks things since Wi-Fi
 375          * framework assumes that this directory can be accessed by other
 376          * applications in the wifi group. Fix this by adding group access even
 377          * if umask value would prevent this.
 378          */
 379         if (chmod(dir, S_IRWXU | S_IRWXG) < 0) {
 380                 wpa_printf(MSG_ERROR, "CTRL: Could not chmod directory: %s",
 381                            strerror(errno));
 382                 /* Try to continue anyway */
 383         }
 384 #endif /* ANDROID */
 385
 386         if (gid_str) {
 387                 grp = getgrnam(gid_str);
 388                 if (grp) {
 389                         gid = grp->gr_gid;
 390                         gid_set = 1;
 391                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
 392                                    " (from group name '%s')",
 393                                    (int) gid, gid_str);
 394                 } else {
 395                         /* Group name not found - try to parse this as gid */
 396                         gid = strtol(gid_str, &endp, 10);
 397                         if (*gid_str == '\0' || *endp != '\0') {
 398                                 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
 399                                            "'%s'", gid_str);
 400                                 goto fail;
 401                         }
 402                         gid_set = 1;
 403                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
 404                                    (int) gid);
 405                 }
 406         }
 407
 408         if (gid_set && chown(dir, -1, gid) < 0) {
 409                 wpa_printf(MSG_ERROR, "chown[ctrl_interface=%s,gid=%d]: %s",
 410                            dir, (int) gid, strerror(errno));
 411                 goto fail;
 412         }
 413
 414         /* Make sure the group can enter and read the directory */
 415         if (gid_set &&
 416             chmod(dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP) < 0) {
 417                 wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
 418                            strerror(errno));
 419                 goto fail;
 420         }
 421
 422         if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
 423             sizeof(addr.sun_path)) {
 424                 wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
 425                 goto fail;
 426         }
 427
 428         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 429         if (priv->sock < 0) {
 430                 wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
 431                 goto fail;
 432         }
 433
 434         os_memset(&addr, 0, sizeof(addr));
 435 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 436         addr.sun_len = sizeof(addr);
 437 #endif /* __FreeBSD__ */
 438         addr.sun_family = AF_UNIX;
 439         fname = wpa_supplicant_ctrl_iface_path(wpa_s);
 440         if (fname == NULL)
 441                 goto fail;
 442         os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
 443         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 444                 wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
 445                            strerror(errno));
 446                 if (connect(priv->sock, (struct sockaddr *) &addr,
 447                             sizeof(addr)) < 0) {
 448                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 449                                    " allow connections - assuming it was left"
 450                                    "over from forced program termination");
 451                         if (unlink(fname) < 0) {
 452                                 wpa_printf(MSG_ERROR,
 453                                            "Could not unlink existing ctrl_iface socket '%s': %s",
 454                                            fname, strerror(errno));
 455                                 goto fail;
 456                         }
 457                         if (bind(priv->sock, (struct sockaddr *) &addr,
 458                                  sizeof(addr)) < 0) {
 459                                 wpa_printf(MSG_ERROR, "supp-ctrl-iface-init: bind(PF_UNIX): %s",
 460                                            strerror(errno));
 461                                 goto fail;
 462                         }
 463                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 464                                    "ctrl_iface socket '%s'", fname);
 465                 } else {
 466                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 467                                    "be in use - cannot override it");
 468                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 469                                    "not used anymore", fname);
 470                         os_free(fname);
 471                         fname = NULL;
 472                         goto fail;
 473                 }
 474         }
 475
 476         if (gid_set && chown(fname, -1, gid) < 0) {
 477                 wpa_printf(MSG_ERROR, "chown[ctrl_interface=%s,gid=%d]: %s",
 478                            fname, (int) gid, strerror(errno));
 479                 goto fail;
 480         }
 481
 482         if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
 483                 wpa_printf(MSG_ERROR, "chmod[ctrl_interface=%s]: %s",
 484                            fname, strerror(errno));
 485                 goto fail;
 486         }
 487         os_free(fname);
 488
 489 #ifdef ANDROID
 490 havesock:
 491 #endif /* ANDROID */
 492
 493         /*
 494          * Make socket non-blocking so that we don't hang forever if
 495          * target dies unexpectedly.
 496          */
 497         flags = fcntl(priv->sock, F_GETFL);
 498         if (flags >= 0) {
 499                 flags |= O_NONBLOCK;
 500                 if (fcntl(priv->sock, F_SETFL, flags) < 0) {
 501                         wpa_printf(MSG_INFO, "fcntl(ctrl, O_NONBLOCK): %s",
 502                                    strerror(errno));
 503                         /* Not fatal, continue on.*/
 504                 }
 505         }
 506
 507         eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 508                                  wpa_s, priv);
 509         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 510
 511         os_free(buf);
 512         return 0;
 513
 514 fail:
 515         if (priv->sock >= 0) {
 516                 close(priv->sock);
 517                 priv->sock = -1;
 518         }
 519         if (fname) {
 520                 unlink(fname);
 521                 os_free(fname);
 522         }
 523         os_free(buf);
 524         return -1;
 525 }
 526
 527
 528 struct ctrl_iface_priv *
 529 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 530 {
 531         struct ctrl_iface_priv *priv;
 532
 533         priv = os_zalloc(sizeof(*priv));
 534         if (priv == NULL)
 535                 return NULL;
 536         dl_list_init(&priv->ctrl_dst);
 537         priv->wpa_s = wpa_s;
 538         priv->sock = -1;
 539
 540         if (wpa_s->conf->ctrl_interface == NULL)
 541                 return priv;
 542
 543         if (wpas_ctrl_iface_open_sock(wpa_s, priv) < 0) {
 544                 os_free(priv);
 545                 return NULL;
 546         }
 547
 548         return priv;
 549 }
 550
 551
 552 static int wpas_ctrl_iface_reinit(struct wpa_supplicant *wpa_s,
 553                                   struct ctrl_iface_priv *priv)
 554 {
 555         int res;
 556
 557         if (priv->sock <= 0)
 558                 return -1;
 559
 560         eloop_unregister_read_sock(priv->sock);
 561         close(priv->sock);
 562         priv->sock = -1;
 563         res = wpas_ctrl_iface_open_sock(wpa_s, priv);
 564         if (res < 0)
 565                 return -1;
 566         return priv->sock;
 567 }
 568
 569
 570 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 571 {
 572         struct wpa_ctrl_dst *dst, *prev;
 573
 574         if (priv->sock > -1) {
 575                 char *fname;
 576                 char *buf, *dir = NULL, *gid_str = NULL;
 577                 eloop_unregister_read_sock(priv->sock);
 578                 if (!dl_list_empty(&priv->ctrl_dst)) {
 579                         /*
 580                          * Wait before closing the control socket if
 581                          * there are any attached monitors in order to allow
 582                          * them to receive any pending messages.
 583                          */
 584                         wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 585                                    "monitors to receive messages");
 586                         os_sleep(0, 100000);
 587                 }
 588                 close(priv->sock);
 589                 priv->sock = -1;
 590                 fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
 591                 if (fname) {
 592                         unlink(fname);
 593                         os_free(fname);
 594                 }
 595
 596                 if (priv->wpa_s->conf->ctrl_interface == NULL)
 597                         goto free_dst;
 598                 buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
 599                 if (buf == NULL)
 600                         goto free_dst;
 601                 if (os_strncmp(buf, "DIR=", 4) == 0) {
 602                         dir = buf + 4;
 603                         gid_str = os_strstr(dir, " GROUP=");
 604                         if (gid_str) {
 605                                 *gid_str = '\0';
 606                                 gid_str += 7;
 607                         }
 608                 } else
 609                         dir = buf;
 610
 611                 if (rmdir(dir) < 0) {
 612                         if (errno == ENOTEMPTY) {
 613                                 wpa_printf(MSG_DEBUG, "Control interface "
 614                                            "directory not empty - leaving it "
 615                                            "behind");
 616                         } else {
 617                                 wpa_printf(MSG_ERROR,
 618                                            "rmdir[ctrl_interface=%s]: %s",
 619                                            dir, strerror(errno));
 620                         }
 621                 }
 622                 os_free(buf);
 623         }
 624
 625 free_dst:
 626         dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
 627                               list)
 628                 os_free(dst);
 629         os_free(priv);
 630 }
 631
 632
 633 /**
 634  * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
 635  * @ifname: Interface name for global control socket or %NULL
 636  * @sock: Local socket fd
 637  * @ctrl_dst: List of attached listeners
 638  * @level: Priority level of the message
 639  * @buf: Message data
 640  * @len: Message length
 641  *
 642  * Send a packet to all monitor programs attached to the control interface.
 643  */
 644 static void wpa_supplicant_ctrl_iface_send(struct wpa_supplicant *wpa_s,
 645                                            const char *ifname, int sock,
 646                                            struct dl_list *ctrl_dst,
 647                                            int level, const char *buf,
 648                                            size_t len,
 649                                            struct ctrl_iface_priv *priv,
 650                                            struct ctrl_iface_global_priv *gp)
 651 {
 652         struct wpa_ctrl_dst *dst, *next;
 653         char levelstr[10];
 654         int idx, res;
 655         struct msghdr msg;
 656         struct iovec io[5];
 657
 658         if (sock < 0 || dl_list_empty(ctrl_dst))
 659                 return;
 660
 661         res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 662         if (res < 0 || (size_t) res >= sizeof(levelstr))
 663                 return;
 664         idx = 0;
 665         if (ifname) {
 666                 io[idx].iov_base = "IFNAME=";
 667                 io[idx].iov_len = 7;
 668                 idx++;
 669                 io[idx].iov_base = (char *) ifname;
 670                 io[idx].iov_len = os_strlen(ifname);
 671                 idx++;
 672                 io[idx].iov_base = " ";
 673                 io[idx].iov_len = 1;
 674                 idx++;
 675         }
 676         io[idx].iov_base = levelstr;
 677         io[idx].iov_len = os_strlen(levelstr);
 678         idx++;
 679         io[idx].iov_base = (char *) buf;
 680         io[idx].iov_len = len;
 681         idx++;
 682         os_memset(&msg, 0, sizeof(msg));
 683         msg.msg_iov = io;
 684         msg.msg_iovlen = idx;
 685
 686         dl_list_for_each_safe(dst, next, ctrl_dst, struct wpa_ctrl_dst, list) {
 687                 int _errno;
 688                 char addr_txt[200];
 689
 690                 if (level < dst->debug_level)
 691                         continue;
 692
 693                 printf_encode(addr_txt, sizeof(addr_txt),
 694                               (u8 *) dst->addr.sun_path, dst->addrlen -
 695                               offsetof(struct sockaddr_un, sun_path));
 696                 msg.msg_name = (void *) &dst->addr;
 697                 msg.msg_namelen = dst->addrlen;
 698                 if (sendmsg(sock, &msg, MSG_DONTWAIT) >= 0) {
 699                         wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor sent successfully to %s",
 700                                    addr_txt);
 701                         dst->errors = 0;
 702                         continue;
 703                 }
 704
 705                 _errno = errno;
 706                 wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor[%s]: %d - %s",
 707                            addr_txt, errno, strerror(errno));
 708                 dst->errors++;
 709
 710                 if (dst->errors > 10 || _errno == ENOENT || _errno == EPERM) {
 711                         wpa_printf(MSG_INFO, "CTRL_IFACE: Detach monitor %s that cannot receive messages",
 712                                 addr_txt);
 713                         wpa_supplicant_ctrl_iface_detach(ctrl_dst, &dst->addr,
 714                                                          dst->addrlen);
 715                 }
 716
 717                 if (_errno == ENOBUFS || _errno == EAGAIN) {
 718                         /*
 719                          * The socket send buffer could be full. This may happen
 720                          * if client programs are not receiving their pending
 721                          * messages. Close and reopen the socket as a workaround
 722                          * to avoid getting stuck being unable to send any new
 723                          * responses.
 724                          */
 725                         if (priv)
 726                                 sock = wpas_ctrl_iface_reinit(wpa_s, priv);
 727                         else if (gp)
 728                                 sock = wpas_ctrl_iface_global_reinit(
 729                                         wpa_s->global, gp);
 730                         else
 731                                 break;
 732                         if (sock < 0) {
 733                                 wpa_dbg(wpa_s, MSG_DEBUG,
 734                                         "Failed to reinitialize ctrl_iface socket");
 735                                 break;
 736                         }
 737                 }
 738         }
 739 }
 740
 741
 742 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 743 {
 744         char buf[256];
 745         int res;
 746         struct sockaddr_un from;
 747         socklen_t fromlen = sizeof(from);
 748
 749         for (;;) {
 750                 wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
 751                            "attach", priv->wpa_s->ifname);
 752                 eloop_wait_for_read_sock(priv->sock);
 753
 754                 res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
 755                                (struct sockaddr *) &from, &fromlen);
 756                 if (res < 0) {
 757                         wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
 758                                    strerror(errno));
 759                         continue;
 760                 }
 761                 buf[res] = '\0';
 762
 763                 if (os_strcmp(buf, "ATTACH") == 0) {
 764                         /* handle ATTACH signal of first monitor interface */
 765                         if (!wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst,
 766                                                               &from, fromlen)) {
 767                                 if (sendto(priv->sock, "OK\n", 3, 0,
 768                                            (struct sockaddr *) &from, fromlen) <
 769                                     0) {
 770                                         wpa_printf(MSG_DEBUG, "ctrl_iface sendto failed: %s",
 771                                                    strerror(errno));
 772                                 }
 773                                 /* OK to continue */
 774                                 return;
 775                         } else {
 776                                 if (sendto(priv->sock, "FAIL\n", 5, 0,
 777                                            (struct sockaddr *) &from, fromlen) <
 778                                     0) {
 779                                         wpa_printf(MSG_DEBUG, "ctrl_iface sendto failed: %s",
 780                                                    strerror(errno));
 781                                 }
 782                         }
 783                 } else {
 784                         /* return FAIL for all other signals */
 785                         if (sendto(priv->sock, "FAIL\n", 5, 0,
 786                                    (struct sockaddr *) &from, fromlen) < 0) {
 787                                 wpa_printf(MSG_DEBUG,
 788                                            "ctrl_iface sendto failed: %s",
 789                                            strerror(errno));
 790                         }
 791                 }
 792         }
 793 }
 794
 795
 796 /* Global ctrl_iface */
 797
 798 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
 799                                                      void *sock_ctx)
 800 {
 801         struct wpa_global *global = eloop_ctx;
 802         struct ctrl_iface_global_priv *priv = sock_ctx;
 803         char buf[4096];
 804         int res;
 805         struct sockaddr_un from;
 806         socklen_t fromlen = sizeof(from);
 807         char *reply = NULL, *reply_buf = NULL;
 808         size_t reply_len;
 809
 810         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 811                        (struct sockaddr *) &from, &fromlen);
 812         if (res < 0) {
 813                 wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
 814                            strerror(errno));
 815                 return;
 816         }
 817         buf[res] = '\0';
 818
 819         if (os_strcmp(buf, "ATTACH") == 0) {
 820                 if (wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst, &from,
 821                                                      fromlen))
 822                         reply_len = 1;
 823                 else
 824                         reply_len = 2;
 825         } else if (os_strcmp(buf, "DETACH") == 0) {
 826                 if (wpa_supplicant_ctrl_iface_detach(&priv->ctrl_dst, &from,
 827                                                      fromlen))
 828                         reply_len = 1;
 829                 else
 830                         reply_len = 2;
 831         } else {
 832                 reply_buf = wpa_supplicant_global_ctrl_iface_process(
 833                         global, buf, &reply_len);
 834                 reply = reply_buf;
 835         }
 836
 837         if (!reply && reply_len == 1) {
 838                 reply = "FAIL\n";
 839                 reply_len = 5;
 840         } else if (!reply && reply_len == 2) {
 841                 reply = "OK\n";
 842                 reply_len = 3;
 843         }
 844
 845         if (reply) {
 846                 if (sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 847                            fromlen) < 0) {
 848                         wpa_printf(MSG_DEBUG, "ctrl_iface sendto failed: %s",
 849                                 strerror(errno));
 850                 }
 851         }
 852         os_free(reply_buf);
 853 }
 854
 855
 856 static int wpas_global_ctrl_iface_open_sock(struct wpa_global *global,
 857                                             struct ctrl_iface_global_priv *priv)
 858 {
 859         struct sockaddr_un addr;
 860         const char *ctrl = global->params.ctrl_interface;
 861         int flags;
 862
 863         wpa_printf(MSG_DEBUG, "Global control interface '%s'", ctrl);
 864
 865 #ifdef ANDROID
 866         if (os_strncmp(ctrl, "@android:", 9) == 0) {
 867                 priv->sock = android_get_control_socket(ctrl + 9);
 868                 if (priv->sock < 0) {
 869                         wpa_printf(MSG_ERROR, "Failed to open Android control "
 870                                    "socket '%s'", ctrl + 9);
 871                         goto fail;
 872                 }
 873                 wpa_printf(MSG_DEBUG, "Using Android control socket '%s'",
 874                            ctrl + 9);
 875                 goto havesock;
 876         }
 877
 878         if (os_strncmp(ctrl, "@abstract:", 10) != 0) {
 879                 /*
 880                  * Backwards compatibility - try to open an Android control
 881                  * socket and if that fails, assume this was a UNIX domain
 882                  * socket instead.
 883                  */
 884                 priv->sock = android_get_control_socket(ctrl);
 885                 if (priv->sock >= 0) {
 886                         wpa_printf(MSG_DEBUG,
 887                                    "Using Android control socket '%s'",
 888                                    ctrl);
 889                         goto havesock;
 890                 }
 891         }
 892 #endif /* ANDROID */
 893
 894         priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 895         if (priv->sock < 0) {
 896                 wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
 897                 goto fail;
 898         }
 899
 900         os_memset(&addr, 0, sizeof(addr));
 901 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 902         addr.sun_len = sizeof(addr);
 903 #endif /* __FreeBSD__ */
 904         addr.sun_family = AF_UNIX;
 905
 906         if (os_strncmp(ctrl, "@abstract:", 10) == 0) {
 907                 addr.sun_path[0] = '\0';
 908                 os_strlcpy(addr.sun_path + 1, ctrl + 10,
 909                            sizeof(addr.sun_path) - 1);
 910                 if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) <
 911                     0) {
 912                         wpa_printf(MSG_ERROR, "supp-global-ctrl-iface-init: "
 913                                    "bind(PF_UNIX;%s) failed: %s",
 914                                    ctrl, strerror(errno));
 915                         goto fail;
 916                 }
 917                 wpa_printf(MSG_DEBUG, "Using Abstract control socket '%s'",
 918                            ctrl + 10);
 919                 goto havesock;
 920         }
 921
 922         os_strlcpy(addr.sun_path, ctrl, sizeof(addr.sun_path));
 923         if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 924                 wpa_printf(MSG_INFO, "supp-global-ctrl-iface-init(%s) (will try fixup): bind(PF_UNIX): %s",
 925                            ctrl, strerror(errno));
 926                 if (connect(priv->sock, (struct sockaddr *) &addr,
 927                             sizeof(addr)) < 0) {
 928                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 929                                    " allow connections - assuming it was left"
 930                                    "over from forced program termination");
 931                         if (unlink(ctrl) < 0) {
 932                                 wpa_printf(MSG_ERROR,
 933                                            "Could not unlink existing ctrl_iface socket '%s': %s",
 934                                            ctrl, strerror(errno));
 935                                 goto fail;
 936                         }
 937                         if (bind(priv->sock, (struct sockaddr *) &addr,
 938                                  sizeof(addr)) < 0) {
 939                                 wpa_printf(MSG_ERROR, "supp-glb-iface-init: bind(PF_UNIX;%s): %s",
 940                                            ctrl, strerror(errno));
 941                                 goto fail;
 942                         }
 943                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 944                                    "ctrl_iface socket '%s'",
 945                                    ctrl);
 946                 } else {
 947                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 948                                    "be in use - cannot override it");
 949                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 950                                    "not used anymore",
 951                                    ctrl);
 952                         goto fail;
 953                 }
 954         }
 955
 956         wpa_printf(MSG_DEBUG, "Using UNIX control socket '%s'", ctrl);
 957
 958         if (global->params.ctrl_interface_group) {
 959                 char *gid_str = global->params.ctrl_interface_group;
 960                 gid_t gid = 0;
 961                 struct group *grp;
 962                 char *endp;
 963
 964                 grp = getgrnam(gid_str);
 965                 if (grp) {
 966                         gid = grp->gr_gid;
 967                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
 968                                    " (from group name '%s')",
 969                                    (int) gid, gid_str);
 970                 } else {
 971                         /* Group name not found - try to parse this as gid */
 972                         gid = strtol(gid_str, &endp, 10);
 973                         if (*gid_str == '\0' || *endp != '\0') {
 974                                 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
 975                                            "'%s'", gid_str);
 976                                 goto fail;
 977                         }
 978                         wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
 979                                    (int) gid);
 980                 }
 981                 if (chown(ctrl, -1, gid) < 0) {
 982                         wpa_printf(MSG_ERROR,
 983                                    "chown[global_ctrl_interface=%s,gid=%d]: %s",
 984                                    ctrl, (int) gid, strerror(errno));
 985                         goto fail;
 986                 }
 987
 988                 if (chmod(ctrl, S_IRWXU | S_IRWXG) < 0) {
 989                         wpa_printf(MSG_ERROR,
 990                                    "chmod[global_ctrl_interface=%s]: %s",
 991                                    ctrl, strerror(errno));
 992                         goto fail;
 993                 }
 994         } else {
 995                 chmod(ctrl, S_IRWXU);
 996         }
 997
 998 havesock:
 999
1000         /*
1001          * Make socket non-blocking so that we don't hang forever if
1002          * target dies unexpectedly.
1003          */
1004         flags = fcntl(priv->sock, F_GETFL);
1005         if (flags >= 0) {
1006                 flags |= O_NONBLOCK;
1007                 if (fcntl(priv->sock, F_SETFL, flags) < 0) {
1008                         wpa_printf(MSG_INFO, "fcntl(ctrl, O_NONBLOCK): %s",
1009                                    strerror(errno));
1010                         /* Not fatal, continue on.*/
1011                 }
1012         }
1013
1014         eloop_register_read_sock(priv->sock,
1015                                  wpa_supplicant_global_ctrl_iface_receive,
1016                                  global, priv);
1017
1018         return 0;
1019
1020 fail:
1021         if (priv->sock >= 0) {
1022                 close(priv->sock);
1023                 priv->sock = -1;
1024         }
1025         return -1;
1026 }
1027
1028
1029 struct ctrl_iface_global_priv *
1030 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
1031 {
1032         struct ctrl_iface_global_priv *priv;
1033
1034         priv = os_zalloc(sizeof(*priv));
1035         if (priv == NULL)
1036                 return NULL;
1037         dl_list_init(&priv->ctrl_dst);
1038         priv->global = global;
1039         priv->sock = -1;
1040
1041         if (global->params.ctrl_interface == NULL)
1042                 return priv;
1043
1044         if (wpas_global_ctrl_iface_open_sock(global, priv) < 0) {
1045                 os_free(priv);
1046                 return NULL;
1047         }
1048
1049         wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
1050
1051         return priv;
1052 }
1053
1054
1055 static int wpas_ctrl_iface_global_reinit(struct wpa_global *global,
1056                                          struct ctrl_iface_global_priv *priv)
1057 {
1058         int res;
1059
1060         if (priv->sock <= 0)
1061                 return -1;
1062
1063         eloop_unregister_read_sock(priv->sock);
1064         close(priv->sock);
1065         priv->sock = -1;
1066         res = wpas_global_ctrl_iface_open_sock(global, priv);
1067         if (res < 0)
1068                 return -1;
1069         return priv->sock;
1070 }
1071
1072
1073 void
1074 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
1075 {
1076         struct wpa_ctrl_dst *dst, *prev;
1077
1078         if (priv->sock >= 0) {
1079                 eloop_unregister_read_sock(priv->sock);
1080                 close(priv->sock);
1081         }
1082         if (priv->global->params.ctrl_interface)
1083                 unlink(priv->global->params.ctrl_interface);
1084         dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
1085                               list)
1086                 os_free(dst);
1087         os_free(priv);
1088 }