hostapd/ctrl_iface.c

   1 /*
   2  * hostapd / UNIX domain socket -based control interface
   3  * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "utils/includes.h"
  16
  17 #ifndef CONFIG_NATIVE_WINDOWS
  18
  19 #include <sys/un.h>
  20 #include <sys/stat.h>
  21 #include <stddef.h>
  22
  23 #include "utils/common.h"
  24 #include "utils/eloop.h"
  25 #include "common/ieee802_11_defs.h"
  26 #include "drivers/driver.h"
  27 #include "radius/radius_client.h"
  28 #include "ap/hostapd.h"
  29 #include "ap/ap_config.h"
  30 #include "ap/ieee802_1x.h"
  31 #include "ap/wpa_auth.h"
  32 #include "ap/ieee802_11.h"
  33 #include "ap/sta_info.h"
  34 #include "ap/accounting.h"
  35 #include "ap/wps_hostapd.h"
  36 #include "ap/ctrl_iface_ap.h"
  37 #include "ctrl_iface.h"
  38
  39
  40 struct wpa_ctrl_dst {
  41         struct wpa_ctrl_dst *next;
  42         struct sockaddr_un addr;
  43         socklen_t addrlen;
  44         int debug_level;
  45         int errors;
  46 };
  47
  48
  49 static void hostapd_ctrl_iface_send(struct hostapd_data *hapd, int level,
  50                                     const char *buf, size_t len);
  51
  52
  53 static int hostapd_ctrl_iface_attach(struct hostapd_data *hapd,
  54                                      struct sockaddr_un *from,
  55                                      socklen_t fromlen)
  56 {
  57         struct wpa_ctrl_dst *dst;
  58
  59         dst = os_zalloc(sizeof(*dst));
  60         if (dst == NULL)
  61                 return -1;
  62         os_memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
  63         dst->addrlen = fromlen;
  64         dst->debug_level = MSG_INFO;
  65         dst->next = hapd->ctrl_dst;
  66         hapd->ctrl_dst = dst;
  67         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
  68                     (u8 *) from->sun_path,
  69                     fromlen - offsetof(struct sockaddr_un, sun_path));
  70         return 0;
  71 }
  72
  73
  74 static int hostapd_ctrl_iface_detach(struct hostapd_data *hapd,
  75                                      struct sockaddr_un *from,
  76                                      socklen_t fromlen)
  77 {
  78         struct wpa_ctrl_dst *dst, *prev = NULL;
  79
  80         dst = hapd->ctrl_dst;
  81         while (dst) {
  82                 if (fromlen == dst->addrlen &&
  83                     os_memcmp(from->sun_path, dst->addr.sun_path,
  84                               fromlen - offsetof(struct sockaddr_un, sun_path))
  85                     == 0) {
  86                         if (prev == NULL)
  87                                 hapd->ctrl_dst = dst->next;
  88                         else
  89                                 prev->next = dst->next;
  90                         os_free(dst);
  91                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
  92                                     (u8 *) from->sun_path,
  93                                     fromlen -
  94                                     offsetof(struct sockaddr_un, sun_path));
  95                         return 0;
  96                 }
  97                 prev = dst;
  98                 dst = dst->next;
  99         }
 100         return -1;
 101 }
 102
 103
 104 static int hostapd_ctrl_iface_level(struct hostapd_data *hapd,
 105                                     struct sockaddr_un *from,
 106                                     socklen_t fromlen,
 107                                     char *level)
 108 {
 109         struct wpa_ctrl_dst *dst;
 110
 111         wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
 112
 113         dst = hapd->ctrl_dst;
 114         while (dst) {
 115                 if (fromlen == dst->addrlen &&
 116                     os_memcmp(from->sun_path, dst->addr.sun_path,
 117                               fromlen - offsetof(struct sockaddr_un, sun_path))
 118                     == 0) {
 119                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
 120                                     "level", (u8 *) from->sun_path, fromlen -
 121                                     offsetof(struct sockaddr_un, sun_path));
 122                         dst->debug_level = atoi(level);
 123                         return 0;
 124                 }
 125                 dst = dst->next;
 126         }
 127
 128         return -1;
 129 }
 130
 131
 132 static int hostapd_ctrl_iface_new_sta(struct hostapd_data *hapd,
 133                                       const char *txtaddr)
 134 {
 135         u8 addr[ETH_ALEN];
 136         struct sta_info *sta;
 137
 138         wpa_printf(MSG_DEBUG, "CTRL_IFACE NEW_STA %s", txtaddr);
 139
 140         if (hwaddr_aton(txtaddr, addr))
 141                 return -1;
 142
 143         sta = ap_get_sta(hapd, addr);
 144         if (sta)
 145                 return 0;
 146
 147         wpa_printf(MSG_DEBUG, "Add new STA " MACSTR " based on ctrl_iface "
 148                    "notification", MAC2STR(addr));
 149         sta = ap_sta_add(hapd, addr);
 150         if (sta == NULL)
 151                 return -1;
 152
 153         hostapd_new_assoc_sta(hapd, sta, 0);
 154         return 0;
 155 }
 156
 157
 158 #ifdef CONFIG_IEEE80211W
 159 #ifdef NEED_AP_MLME
 160 static int hostapd_ctrl_iface_sa_query(struct hostapd_data *hapd,
 161                                        const char *txtaddr)
 162 {
 163         u8 addr[ETH_ALEN];
 164         u8 trans_id[WLAN_SA_QUERY_TR_ID_LEN];
 165
 166         wpa_printf(MSG_DEBUG, "CTRL_IFACE SA_QUERY %s", txtaddr);
 167
 168         if (hwaddr_aton(txtaddr, addr))
 169                 return -1;
 170
 171         os_get_random(trans_id, WLAN_SA_QUERY_TR_ID_LEN);
 172         ieee802_11_send_sa_query_req(hapd, addr, trans_id);
 173
 174         return 0;
 175 }
 176 #endif /* NEED_AP_MLME */
 177 #endif /* CONFIG_IEEE80211W */
 178
 179
 180 #ifdef CONFIG_WPS
 181 static int hostapd_ctrl_iface_wps_pin(struct hostapd_data *hapd, char *txt)
 182 {
 183         char *pin = os_strchr(txt, ' ');
 184         char *timeout_txt;
 185         int timeout;
 186
 187         if (pin == NULL)
 188                 return -1;
 189         *pin++ = '\0';
 190
 191         timeout_txt = os_strchr(pin, ' ');
 192         if (timeout_txt) {
 193                 *timeout_txt++ = '\0';
 194                 timeout = atoi(timeout_txt);
 195         } else
 196                 timeout = 0;
 197
 198         return hostapd_wps_add_pin(hapd, txt, pin, timeout);
 199 }
 200
 201
 202 #ifdef CONFIG_WPS_OOB
 203 static int hostapd_ctrl_iface_wps_oob(struct hostapd_data *hapd, char *txt)
 204 {
 205         char *path, *method, *name;
 206
 207         path = os_strchr(txt, ' ');
 208         if (path == NULL)
 209                 return -1;
 210         *path++ = '\0';
 211
 212         method = os_strchr(path, ' ');
 213         if (method == NULL)
 214                 return -1;
 215         *method++ = '\0';
 216
 217         name = os_strchr(method, ' ');
 218         if (name != NULL)
 219                 *name++ = '\0';
 220
 221         return hostapd_wps_start_oob(hapd, txt, path, method, name);
 222 }
 223 #endif /* CONFIG_WPS_OOB */
 224 #endif /* CONFIG_WPS */
 225
 226
 227 static void hostapd_ctrl_iface_receive(int sock, void *eloop_ctx,
 228                                        void *sock_ctx)
 229 {
 230         struct hostapd_data *hapd = eloop_ctx;
 231         char buf[256];
 232         int res;
 233         struct sockaddr_un from;
 234         socklen_t fromlen = sizeof(from);
 235         char *reply;
 236         const int reply_size = 4096;
 237         int reply_len;
 238
 239         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 240                        (struct sockaddr *) &from, &fromlen);
 241         if (res < 0) {
 242                 perror("recvfrom(ctrl_iface)");
 243                 return;
 244         }
 245         buf[res] = '\0';
 246         wpa_hexdump_ascii(MSG_DEBUG, "RX ctrl_iface", (u8 *) buf, res);
 247
 248         reply = os_malloc(reply_size);
 249         if (reply == NULL) {
 250                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 251                        fromlen);
 252                 return;
 253         }
 254
 255         os_memcpy(reply, "OK\n", 3);
 256         reply_len = 3;
 257
 258         if (os_strcmp(buf, "PING") == 0) {
 259                 os_memcpy(reply, "PONG\n", 5);
 260                 reply_len = 5;
 261         } else if (os_strcmp(buf, "MIB") == 0) {
 262                 reply_len = ieee802_11_get_mib(hapd, reply, reply_size);
 263                 if (reply_len >= 0) {
 264                         res = wpa_get_mib(hapd->wpa_auth, reply + reply_len,
 265                                           reply_size - reply_len);
 266                         if (res < 0)
 267                                 reply_len = -1;
 268                         else
 269                                 reply_len += res;
 270                 }
 271                 if (reply_len >= 0) {
 272                         res = ieee802_1x_get_mib(hapd, reply + reply_len,
 273                                                  reply_size - reply_len);
 274                         if (res < 0)
 275                                 reply_len = -1;
 276                         else
 277                                 reply_len += res;
 278                 }
 279 #ifndef CONFIG_NO_RADIUS
 280                 if (reply_len >= 0) {
 281                         res = radius_client_get_mib(hapd->radius,
 282                                                     reply + reply_len,
 283                                                     reply_size - reply_len);
 284                         if (res < 0)
 285                                 reply_len = -1;
 286                         else
 287                                 reply_len += res;
 288                 }
 289 #endif /* CONFIG_NO_RADIUS */
 290         } else if (os_strcmp(buf, "STA-FIRST") == 0) {
 291                 reply_len = hostapd_ctrl_iface_sta_first(hapd, reply,
 292                                                          reply_size);
 293         } else if (os_strncmp(buf, "STA ", 4) == 0) {
 294                 reply_len = hostapd_ctrl_iface_sta(hapd, buf + 4, reply,
 295                                                    reply_size);
 296         } else if (os_strncmp(buf, "STA-NEXT ", 9) == 0) {
 297                 reply_len = hostapd_ctrl_iface_sta_next(hapd, buf + 9, reply,
 298                                                         reply_size);
 299         } else if (os_strcmp(buf, "ATTACH") == 0) {
 300                 if (hostapd_ctrl_iface_attach(hapd, &from, fromlen))
 301                         reply_len = -1;
 302         } else if (os_strcmp(buf, "DETACH") == 0) {
 303                 if (hostapd_ctrl_iface_detach(hapd, &from, fromlen))
 304                         reply_len = -1;
 305         } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
 306                 if (hostapd_ctrl_iface_level(hapd, &from, fromlen,
 307                                                     buf + 6))
 308                         reply_len = -1;
 309         } else if (os_strncmp(buf, "NEW_STA ", 8) == 0) {
 310                 if (hostapd_ctrl_iface_new_sta(hapd, buf + 8))
 311                         reply_len = -1;
 312 #ifdef CONFIG_IEEE80211W
 313 #ifdef NEED_AP_MLME
 314         } else if (os_strncmp(buf, "SA_QUERY ", 9) == 0) {
 315                 if (hostapd_ctrl_iface_sa_query(hapd, buf + 9))
 316                         reply_len = -1;
 317 #endif /* NEED_AP_MLME */
 318 #endif /* CONFIG_IEEE80211W */
 319 #ifdef CONFIG_WPS
 320         } else if (os_strncmp(buf, "WPS_PIN ", 8) == 0) {
 321                 if (hostapd_ctrl_iface_wps_pin(hapd, buf + 8))
 322                         reply_len = -1;
 323         } else if (os_strcmp(buf, "WPS_PBC") == 0) {
 324                 if (hostapd_wps_button_pushed(hapd))
 325                         reply_len = -1;
 326 #ifdef CONFIG_WPS_OOB
 327         } else if (os_strncmp(buf, "WPS_OOB ", 8) == 0) {
 328                 if (hostapd_ctrl_iface_wps_oob(hapd, buf + 8))
 329                         reply_len = -1;
 330 #endif /* CONFIG_WPS_OOB */
 331 #endif /* CONFIG_WPS */
 332         } else {
 333                 os_memcpy(reply, "UNKNOWN COMMAND\n", 16);
 334                 reply_len = 16;
 335         }
 336
 337         if (reply_len < 0) {
 338                 os_memcpy(reply, "FAIL\n", 5);
 339                 reply_len = 5;
 340         }
 341         sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from, fromlen);
 342         os_free(reply);
 343 }
 344
 345
 346 static char * hostapd_ctrl_iface_path(struct hostapd_data *hapd)
 347 {
 348         char *buf;
 349         size_t len;
 350
 351         if (hapd->conf->ctrl_interface == NULL)
 352                 return NULL;
 353
 354         len = os_strlen(hapd->conf->ctrl_interface) +
 355                 os_strlen(hapd->conf->iface) + 2;
 356         buf = os_malloc(len);
 357         if (buf == NULL)
 358                 return NULL;
 359
 360         os_snprintf(buf, len, "%s/%s",
 361                     hapd->conf->ctrl_interface, hapd->conf->iface);
 362         buf[len - 1] = '\0';
 363         return buf;
 364 }
 365
 366
 367 static void hostapd_ctrl_iface_msg_cb(void *ctx, int level,
 368                                       const char *txt, size_t len)
 369 {
 370         struct hostapd_data *hapd = ctx;
 371         if (hapd == NULL)
 372                 return;
 373         hostapd_ctrl_iface_send(hapd, level, txt, len);
 374 }
 375
 376
 377 int hostapd_ctrl_iface_init(struct hostapd_data *hapd)
 378 {
 379         struct sockaddr_un addr;
 380         int s = -1;
 381         char *fname = NULL;
 382
 383         hapd->ctrl_sock = -1;
 384
 385         if (hapd->conf->ctrl_interface == NULL)
 386                 return 0;
 387
 388         if (mkdir(hapd->conf->ctrl_interface, S_IRWXU | S_IRWXG) < 0) {
 389                 if (errno == EEXIST) {
 390                         wpa_printf(MSG_DEBUG, "Using existing control "
 391                                    "interface directory.");
 392                 } else {
 393                         perror("mkdir[ctrl_interface]");
 394                         goto fail;
 395                 }
 396         }
 397
 398         if (hapd->conf->ctrl_interface_gid_set &&
 399             chown(hapd->conf->ctrl_interface, 0,
 400                   hapd->conf->ctrl_interface_gid) < 0) {
 401                 perror("chown[ctrl_interface]");
 402                 return -1;
 403         }
 404
 405         if (os_strlen(hapd->conf->ctrl_interface) + 1 +
 406             os_strlen(hapd->conf->iface) >= sizeof(addr.sun_path))
 407                 goto fail;
 408
 409         s = socket(PF_UNIX, SOCK_DGRAM, 0);
 410         if (s < 0) {
 411                 perror("socket(PF_UNIX)");
 412                 goto fail;
 413         }
 414
 415         os_memset(&addr, 0, sizeof(addr));
 416 #ifdef __FreeBSD__
 417         addr.sun_len = sizeof(addr);
 418 #endif /* __FreeBSD__ */
 419         addr.sun_family = AF_UNIX;
 420         fname = hostapd_ctrl_iface_path(hapd);
 421         if (fname == NULL)
 422                 goto fail;
 423         os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
 424         if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 425                 wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
 426                            strerror(errno));
 427                 if (connect(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 428                         wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 429                                    " allow connections - assuming it was left"
 430                                    "over from forced program termination");
 431                         if (unlink(fname) < 0) {
 432                                 perror("unlink[ctrl_iface]");
 433                                 wpa_printf(MSG_ERROR, "Could not unlink "
 434                                            "existing ctrl_iface socket '%s'",
 435                                            fname);
 436                                 goto fail;
 437                         }
 438                         if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) <
 439                             0) {
 440                                 perror("bind(PF_UNIX)");
 441                                 goto fail;
 442                         }
 443                         wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 444                                    "ctrl_iface socket '%s'", fname);
 445                 } else {
 446                         wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 447                                    "be in use - cannot override it");
 448                         wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 449                                    "not used anymore", fname);
 450                         os_free(fname);
 451                         fname = NULL;
 452                         goto fail;
 453                 }
 454         }
 455
 456         if (hapd->conf->ctrl_interface_gid_set &&
 457             chown(fname, 0, hapd->conf->ctrl_interface_gid) < 0) {
 458                 perror("chown[ctrl_interface/ifname]");
 459                 goto fail;
 460         }
 461
 462         if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
 463                 perror("chmod[ctrl_interface/ifname]");
 464                 goto fail;
 465         }
 466         os_free(fname);
 467
 468         hapd->ctrl_sock = s;
 469         eloop_register_read_sock(s, hostapd_ctrl_iface_receive, hapd,
 470                                  NULL);
 471         hapd->msg_ctx = hapd;
 472         wpa_msg_register_cb(hostapd_ctrl_iface_msg_cb);
 473
 474         return 0;
 475
 476 fail:
 477         if (s >= 0)
 478                 close(s);
 479         if (fname) {
 480                 unlink(fname);
 481                 os_free(fname);
 482         }
 483         return -1;
 484 }
 485
 486
 487 void hostapd_ctrl_iface_deinit(struct hostapd_data *hapd)
 488 {
 489         struct wpa_ctrl_dst *dst, *prev;
 490
 491         if (hapd->ctrl_sock > -1) {
 492                 char *fname;
 493                 eloop_unregister_read_sock(hapd->ctrl_sock);
 494                 close(hapd->ctrl_sock);
 495                 hapd->ctrl_sock = -1;
 496                 fname = hostapd_ctrl_iface_path(hapd);
 497                 if (fname)
 498                         unlink(fname);
 499                 os_free(fname);
 500
 501                 if (hapd->conf->ctrl_interface &&
 502                     rmdir(hapd->conf->ctrl_interface) < 0) {
 503                         if (errno == ENOTEMPTY) {
 504                                 wpa_printf(MSG_DEBUG, "Control interface "
 505                                            "directory not empty - leaving it "
 506                                            "behind");
 507                         } else {
 508                                 perror("rmdir[ctrl_interface]");
 509                         }
 510                 }
 511         }
 512
 513         dst = hapd->ctrl_dst;
 514         while (dst) {
 515                 prev = dst;
 516                 dst = dst->next;
 517                 os_free(prev);
 518         }
 519 }
 520
 521
 522 static void hostapd_ctrl_iface_send(struct hostapd_data *hapd, int level,
 523                                     const char *buf, size_t len)
 524 {
 525         struct wpa_ctrl_dst *dst, *next;
 526         struct msghdr msg;
 527         int idx;
 528         struct iovec io[2];
 529         char levelstr[10];
 530
 531         dst = hapd->ctrl_dst;
 532         if (hapd->ctrl_sock < 0 || dst == NULL)
 533                 return;
 534
 535         os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 536         io[0].iov_base = levelstr;
 537         io[0].iov_len = os_strlen(levelstr);
 538         io[1].iov_base = (char *) buf;
 539         io[1].iov_len = len;
 540         os_memset(&msg, 0, sizeof(msg));
 541         msg.msg_iov = io;
 542         msg.msg_iovlen = 2;
 543
 544         idx = 0;
 545         while (dst) {
 546                 next = dst->next;
 547                 if (level >= dst->debug_level) {
 548                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
 549                                     (u8 *) dst->addr.sun_path, dst->addrlen -
 550                                     offsetof(struct sockaddr_un, sun_path));
 551                         msg.msg_name = &dst->addr;
 552                         msg.msg_namelen = dst->addrlen;
 553                         if (sendmsg(hapd->ctrl_sock, &msg, 0) < 0) {
 554                                 int _errno = errno;
 555                                 wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
 556                                            "%d - %s",
 557                                            idx, errno, strerror(errno));
 558                                 dst->errors++;
 559                                 if (dst->errors > 10 || _errno == ENOENT) {
 560                                         hostapd_ctrl_iface_detach(
 561                                                 hapd, &dst->addr,
 562                                                 dst->addrlen);
 563                                 }
 564                         } else
 565                                 dst->errors = 0;
 566                 }
 567                 idx++;
 568                 dst = next;
 569         }
 570 }
 571
 572 #endif /* CONFIG_NATIVE_WINDOWS */