hostapd/ctrl_iface.c

   1 /*
   2  * hostapd / UNIX domain socket -based control interface
   3  * Copyright (c) 2004-2008, 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 "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 "hostapd.h"
  24 #include "eloop.h"
  25 #include "config.h"
  26 #include "ieee802_1x.h"
  27 #include "wpa.h"
  28 #include "radius/radius_client.h"
  29 #include "ieee802_11.h"
  30 #include "ctrl_iface.h"
  31 #include "sta_info.h"
  32 #include "accounting.h"
  33 #include "wps_hostapd.h"
  34 #include "driver.h"
  35
  36
  37 struct wpa_ctrl_dst {
  38         struct wpa_ctrl_dst *next;
  39         struct sockaddr_un addr;
  40         socklen_t addrlen;
  41         int debug_level;
  42         int errors;
  43 };
  44
  45
  46 static void hostapd_ctrl_iface_send(struct hostapd_data *hapd, int level,
  47                                     const char *buf, size_t len);
  48
  49
  50 static int hostapd_ctrl_iface_attach(struct hostapd_data *hapd,
  51                                      struct sockaddr_un *from,
  52                                      socklen_t fromlen)
  53 {
  54         struct wpa_ctrl_dst *dst;
  55
  56         dst = os_zalloc(sizeof(*dst));
  57         if (dst == NULL)
  58                 return -1;
  59         os_memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
  60         dst->addrlen = fromlen;
  61         dst->debug_level = MSG_INFO;
  62         dst->next = hapd->ctrl_dst;
  63         hapd->ctrl_dst = dst;
  64         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
  65                     (u8 *) from->sun_path,
  66                     fromlen - offsetof(struct sockaddr_un, sun_path));
  67         return 0;
  68 }
  69
  70
  71 static int hostapd_ctrl_iface_detach(struct hostapd_data *hapd,
  72                                      struct sockaddr_un *from,
  73                                      socklen_t fromlen)
  74 {
  75         struct wpa_ctrl_dst *dst, *prev = NULL;
  76
  77         dst = hapd->ctrl_dst;
  78         while (dst) {
  79                 if (fromlen == dst->addrlen &&
  80                     os_memcmp(from->sun_path, dst->addr.sun_path,
  81                               fromlen - offsetof(struct sockaddr_un, sun_path))
  82                     == 0) {
  83                         if (prev == NULL)
  84                                 hapd->ctrl_dst = dst->next;
  85                         else
  86                                 prev->next = dst->next;
  87                         os_free(dst);
  88                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
  89                                     (u8 *) from->sun_path,
  90                                     fromlen -
  91                                     offsetof(struct sockaddr_un, sun_path));
  92                         return 0;
  93                 }
  94                 prev = dst;
  95                 dst = dst->next;
  96         }
  97         return -1;
  98 }
  99
 100
 101 static int hostapd_ctrl_iface_level(struct hostapd_data *hapd,
 102                                     struct sockaddr_un *from,
 103                                     socklen_t fromlen,
 104                                     char *level)
 105 {
 106         struct wpa_ctrl_dst *dst;
 107
 108         wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
 109
 110         dst = hapd->ctrl_dst;
 111         while (dst) {
 112                 if (fromlen == dst->addrlen &&
 113                     os_memcmp(from->sun_path, dst->addr.sun_path,
 114                               fromlen - offsetof(struct sockaddr_un, sun_path))
 115                     == 0) {
 116                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
 117                                     "level", (u8 *) from->sun_path, fromlen -
 118                                     offsetof(struct sockaddr_un, sun_path));
 119                         dst->debug_level = atoi(level);
 120                         return 0;
 121                 }
 122                 dst = dst->next;
 123         }
 124
 125         return -1;
 126 }
 127
 128
 129 static int hostapd_ctrl_iface_sta_mib(struct hostapd_data *hapd,
 130                                       struct sta_info *sta,
 131                                       char *buf, size_t buflen)
 132 {
 133         int len, res, ret;
 134
 135         if (sta == NULL) {
 136                 ret = os_snprintf(buf, buflen, "FAIL\n");
 137                 if (ret < 0 || (size_t) ret >= buflen)
 138                         return 0;
 139                 return ret;
 140         }
 141
 142         len = 0;
 143         ret = os_snprintf(buf + len, buflen - len, MACSTR "\n",
 144                           MAC2STR(sta->addr));
 145         if (ret < 0 || (size_t) ret >= buflen - len)
 146                 return len;
 147         len += ret;
 148
 149         res = ieee802_11_get_mib_sta(hapd, sta, buf + len, buflen - len);
 150         if (res >= 0)
 151                 len += res;
 152         res = wpa_get_mib_sta(sta->wpa_sm, buf + len, buflen - len);
 153         if (res >= 0)
 154                 len += res;
 155         res = ieee802_1x_get_mib_sta(hapd, sta, buf + len, buflen - len);
 156         if (res >= 0)
 157                 len += res;
 158
 159         return len;
 160 }
 161
 162
 163 static int hostapd_ctrl_iface_sta_first(struct hostapd_data *hapd,
 164                                         char *buf, size_t buflen)
 165 {
 166         return hostapd_ctrl_iface_sta_mib(hapd, hapd->sta_list, buf, buflen);
 167 }
 168
 169
 170 static int hostapd_ctrl_iface_sta(struct hostapd_data *hapd,
 171                                   const char *txtaddr,
 172                                   char *buf, size_t buflen)
 173 {
 174         u8 addr[ETH_ALEN];
 175         int ret;
 176
 177         if (hwaddr_aton(txtaddr, addr)) {
 178                 ret = os_snprintf(buf, buflen, "FAIL\n");
 179                 if (ret < 0 || (size_t) ret >= buflen)
 180                         return 0;
 181                 return ret;
 182         }
 183         return hostapd_ctrl_iface_sta_mib(hapd, ap_get_sta(hapd, addr),
 184                                           buf, buflen);
 185 }
 186
 187
 188 static int hostapd_ctrl_iface_sta_next(struct hostapd_data *hapd,
 189                                        const char *txtaddr,
 190                                        char *buf, size_t buflen)
 191 {
 192         u8 addr[ETH_ALEN];
 193         struct sta_info *sta;
 194         int ret;
 195
 196         if (hwaddr_aton(txtaddr, addr) ||
 197             (sta = ap_get_sta(hapd, addr)) == NULL) {
 198                 ret = os_snprintf(buf, buflen, "FAIL\n");
 199                 if (ret < 0 || (size_t) ret >= buflen)
 200                         return 0;
 201                 return ret;
 202         }
 203         return hostapd_ctrl_iface_sta_mib(hapd, sta->next, buf, buflen);
 204 }
 205
 206
 207 static int hostapd_ctrl_iface_new_sta(struct hostapd_data *hapd,
 208                                       const char *txtaddr)
 209 {
 210         u8 addr[ETH_ALEN];
 211         struct sta_info *sta;
 212
 213         wpa_printf(MSG_DEBUG, "CTRL_IFACE NEW_STA %s", txtaddr);
 214
 215         if (hwaddr_aton(txtaddr, addr))
 216                 return -1;
 217
 218         sta = ap_get_sta(hapd, addr);
 219         if (sta)
 220                 return 0;
 221
 222         wpa_printf(MSG_DEBUG, "Add new STA " MACSTR " based on ctrl_iface "
 223                    "notification", MAC2STR(addr));
 224         sta = ap_sta_add(hapd, addr);
 225         if (sta == NULL)
 226                 return -1;
 227
 228         hostapd_new_assoc_sta(hapd, sta, 0);
 229         return 0;
 230 }
 231
 232
 233 #ifdef CONFIG_IEEE80211W
 234 static int hostapd_ctrl_iface_sa_query(struct hostapd_data *hapd,
 235                                        const char *txtaddr)
 236 {
 237         u8 addr[ETH_ALEN];
 238         u8 trans_id[WLAN_SA_QUERY_TR_ID_LEN];
 239
 240         wpa_printf(MSG_DEBUG, "CTRL_IFACE SA_QUERY %s", txtaddr);
 241
 242         if (hwaddr_aton(txtaddr, addr))
 243                 return -1;
 244
 245         os_get_random(trans_id, WLAN_SA_QUERY_TR_ID_LEN);
 246         ieee802_11_send_sa_query_req(hapd, addr, trans_id);
 247
 248         return 0;
 249 }
 250 #endif /* CONFIG_IEEE80211W */
 251
 252
 253 #ifdef CONFIG_WPS
 254 static int hostapd_ctrl_iface_wps_pin(struct hostapd_data *hapd, char *txt)
 255 {
 256         char *pin = os_strchr(txt, ' ');
 257         if (pin == NULL)
 258                 return -1;
 259         *pin++ = '\0';
 260         return hostapd_wps_add_pin(hapd, txt, pin);
 261 }
 262
 263
 264 #ifdef CONFIG_WPS_OOB
 265 static int hostapd_ctrl_iface_wps_oob(struct hostapd_data *hapd, char *txt)
 266 {
 267         char *path, *method, *name;
 268
 269         path = os_strchr(txt, ' ');
 270         if (path == NULL)
 271                 return -1;
 272         *path++ = '\0';
 273
 274         method = os_strchr(path, ' ');
 275         if (method == NULL)
 276                 return -1;
 277         *method++ = '\0';
 278
 279         name = os_strchr(method, ' ');
 280         if (name != NULL)
 281                 *name++ = '\0';
 282
 283         return hostapd_wps_start_oob(hapd, txt, path, method, name);
 284 }
 285 #endif /* CONFIG_WPS_OOB */
 286 #endif /* CONFIG_WPS */
 287
 288
 289 static void hostapd_ctrl_iface_receive(int sock, void *eloop_ctx,
 290                                        void *sock_ctx)
 291 {
 292         struct hostapd_data *hapd = eloop_ctx;
 293         char buf[256];
 294         int res;
 295         struct sockaddr_un from;
 296         socklen_t fromlen = sizeof(from);
 297         char *reply;
 298         const int reply_size = 4096;
 299         int reply_len;
 300
 301         res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 302                        (struct sockaddr *) &from, &fromlen);
 303         if (res < 0) {
 304                 perror("recvfrom(ctrl_iface)");
 305                 return;
 306         }
 307         buf[res] = '\0';
 308         wpa_hexdump_ascii(MSG_DEBUG, "RX ctrl_iface", (u8 *) buf, res);
 309
 310         reply = os_malloc(reply_size);
 311         if (reply == NULL) {
 312                 sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 313                        fromlen);
 314                 return;
 315         }
 316
 317         os_memcpy(reply, "OK\n", 3);
 318         reply_len = 3;
 319
 320         if (os_strcmp(buf, "PING") == 0) {
 321                 os_memcpy(reply, "PONG\n", 5);
 322                 reply_len = 5;
 323         } else if (os_strcmp(buf, "MIB") == 0) {
 324                 reply_len = ieee802_11_get_mib(hapd, reply, reply_size);
 325                 if (reply_len >= 0) {
 326                         res = wpa_get_mib(hapd->wpa_auth, reply + reply_len,
 327                                           reply_size - reply_len);
 328                         if (res < 0)
 329                                 reply_len = -1;
 330                         else
 331                                 reply_len += res;
 332                 }
 333                 if (reply_len >= 0) {
 334                         res = ieee802_1x_get_mib(hapd, reply + reply_len,
 335                                                  reply_size - reply_len);
 336                         if (res < 0)
 337                                 reply_len = -1;
 338                         else
 339                                 reply_len += res;
 340                 }
 341                 if (reply_len >= 0) {
 342                         res = radius_client_get_mib(hapd->radius,
 343                                                     reply + reply_len,
 344                                                     reply_size - reply_len);
 345                         if (res < 0)
 346                                 reply_len = -1;
 347                         else
 348                                 reply_len += res;
 349                 }
 350         } else if (os_strcmp(buf, "STA-FIRST") == 0) {
 351                 reply_len = hostapd_ctrl_iface_sta_first(hapd, reply,
 352                                                          reply_size);
 353         } else if (os_strncmp(buf, "STA ", 4) == 0) {
 354                 reply_len = hostapd_ctrl_iface_sta(hapd, buf + 4, reply,
 355                                                    reply_size);
 356         } else if (os_strncmp(buf, "STA-NEXT ", 9) == 0) {
 357                 reply_len = hostapd_ctrl_iface_sta_next(hapd, buf + 9, reply,
 358                                                         reply_size);
 359         } else if (os_strcmp(buf, "ATTACH") == 0) {
 360                 if (hostapd_ctrl_iface_attach(hapd, &from, fromlen))
 361                         reply_len = -1;
 362         } else if (os_strcmp(buf, "DETACH") == 0) {
 363                 if (hostapd_ctrl_iface_detach(hapd, &from, fromlen))
 364                         reply_len = -1;
 365         } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
 366                 if (hostapd_ctrl_iface_level(hapd, &from, fromlen,
 367                                                     buf + 6))
 368                         reply_len = -1;
 369         } else if (os_strncmp(buf, "NEW_STA ", 8) == 0) {
 370                 if (hostapd_ctrl_iface_new_sta(hapd, buf + 8))
 371                         reply_len = -1;
 372 #ifdef CONFIG_IEEE80211W
 373         } else if (os_strncmp(buf, "SA_QUERY ", 9) == 0) {
 374                 if (hostapd_ctrl_iface_sa_query(hapd, buf + 9))
 375                         reply_len = -1;
 376 #endif /* CONFIG_IEEE80211W */
 377 #ifdef CONFIG_WPS
 378         } else if (os_strncmp(buf, "WPS_PIN ", 8) == 0) {
 379                 if (hostapd_ctrl_iface_wps_pin(hapd, buf + 8))
 380                         reply_len = -1;
 381         } else if (os_strcmp(buf, "WPS_PBC") == 0) {
 382                 if (hostapd_wps_button_pushed(hapd))
 383                         reply_len = -1;
 384 #ifdef CONFIG_WPS_OOB
 385         } else if (os_strncmp(buf, "WPS_OOB ", 8) == 0) {
 386                 if (hostapd_ctrl_iface_wps_oob(hapd, buf + 8))
 387                         reply_len = -1;
 388 #endif /* CONFIG_WPS_OOB */
 389 #endif /* CONFIG_WPS */
 390         } else {
 391                 os_memcpy(reply, "UNKNOWN COMMAND\n", 16);
 392                 reply_len = 16;
 393         }
 394
 395         if (reply_len < 0) {
 396                 os_memcpy(reply, "FAIL\n", 5);
 397                 reply_len = 5;
 398         }
 399         sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from, fromlen);
 400         os_free(reply);
 401 }
 402
 403
 404 static char * hostapd_ctrl_iface_path(struct hostapd_data *hapd)
 405 {
 406         char *buf;
 407         size_t len;
 408
 409         if (hapd->conf->ctrl_interface == NULL)
 410                 return NULL;
 411
 412         len = os_strlen(hapd->conf->ctrl_interface) +
 413                 os_strlen(hapd->conf->iface) + 2;
 414         buf = os_malloc(len);
 415         if (buf == NULL)
 416                 return NULL;
 417
 418         os_snprintf(buf, len, "%s/%s",
 419                     hapd->conf->ctrl_interface, hapd->conf->iface);
 420         buf[len - 1] = '\0';
 421         return buf;
 422 }
 423
 424
 425 static void hostapd_ctrl_iface_msg_cb(void *ctx, int level,
 426                                       const char *txt, size_t len)
 427 {
 428         struct hostapd_data *hapd = ctx;
 429         if (hapd == NULL)
 430                 return;
 431         hostapd_ctrl_iface_send(hapd, level, txt, len);
 432 }
 433
 434
 435 int hostapd_ctrl_iface_init(struct hostapd_data *hapd)
 436 {
 437         struct sockaddr_un addr;
 438         int s = -1;
 439         char *fname = NULL;
 440
 441         hapd->ctrl_sock = -1;
 442
 443         if (hapd->conf->ctrl_interface == NULL)
 444                 return 0;
 445
 446         if (mkdir(hapd->conf->ctrl_interface, S_IRWXU | S_IRWXG) < 0) {
 447                 if (errno == EEXIST) {
 448                         wpa_printf(MSG_DEBUG, "Using existing control "
 449                                    "interface directory.");
 450                 } else {
 451                         perror("mkdir[ctrl_interface]");
 452                         goto fail;
 453                 }
 454         }
 455
 456         if (hapd->conf->ctrl_interface_gid_set &&
 457             chown(hapd->conf->ctrl_interface, 0,
 458                   hapd->conf->ctrl_interface_gid) < 0) {
 459                 perror("chown[ctrl_interface]");
 460                 return -1;
 461         }
 462
 463         if (os_strlen(hapd->conf->ctrl_interface) + 1 +
 464             os_strlen(hapd->conf->iface) >= sizeof(addr.sun_path))
 465                 goto fail;
 466
 467         s = socket(PF_UNIX, SOCK_DGRAM, 0);
 468         if (s < 0) {
 469                 perror("socket(PF_UNIX)");
 470                 goto fail;
 471         }
 472
 473         os_memset(&addr, 0, sizeof(addr));
 474 #ifdef __FreeBSD__
 475         addr.sun_len = sizeof(addr);
 476 #endif /* __FreeBSD__ */
 477         addr.sun_family = AF_UNIX;
 478         fname = hostapd_ctrl_iface_path(hapd);
 479         if (fname == NULL)
 480                 goto fail;
 481         os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
 482         if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 483                 perror("bind(PF_UNIX)");
 484                 goto fail;
 485         }
 486
 487         if (hapd->conf->ctrl_interface_gid_set &&
 488             chown(fname, 0, hapd->conf->ctrl_interface_gid) < 0) {
 489                 perror("chown[ctrl_interface/ifname]");
 490                 goto fail;
 491         }
 492
 493         if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
 494                 perror("chmod[ctrl_interface/ifname]");
 495                 goto fail;
 496         }
 497         os_free(fname);
 498
 499         hapd->ctrl_sock = s;
 500         eloop_register_read_sock(s, hostapd_ctrl_iface_receive, hapd,
 501                                  NULL);
 502         wpa_msg_register_cb(hostapd_ctrl_iface_msg_cb);
 503
 504         return 0;
 505
 506 fail:
 507         if (s >= 0)
 508                 close(s);
 509         if (fname) {
 510                 unlink(fname);
 511                 os_free(fname);
 512         }
 513         return -1;
 514 }
 515
 516
 517 void hostapd_ctrl_iface_deinit(struct hostapd_data *hapd)
 518 {
 519         struct wpa_ctrl_dst *dst, *prev;
 520
 521         if (hapd->ctrl_sock > -1) {
 522                 char *fname;
 523                 eloop_unregister_read_sock(hapd->ctrl_sock);
 524                 close(hapd->ctrl_sock);
 525                 hapd->ctrl_sock = -1;
 526                 fname = hostapd_ctrl_iface_path(hapd);
 527                 if (fname)
 528                         unlink(fname);
 529                 os_free(fname);
 530
 531                 if (hapd->conf->ctrl_interface &&
 532                     rmdir(hapd->conf->ctrl_interface) < 0) {
 533                         if (errno == ENOTEMPTY) {
 534                                 wpa_printf(MSG_DEBUG, "Control interface "
 535                                            "directory not empty - leaving it "
 536                                            "behind");
 537                         } else {
 538                                 perror("rmdir[ctrl_interface]");
 539                         }
 540                 }
 541         }
 542
 543         dst = hapd->ctrl_dst;
 544         while (dst) {
 545                 prev = dst;
 546                 dst = dst->next;
 547                 os_free(prev);
 548         }
 549 }
 550
 551
 552 static void hostapd_ctrl_iface_send(struct hostapd_data *hapd, int level,
 553                                     const char *buf, size_t len)
 554 {
 555         struct wpa_ctrl_dst *dst, *next;
 556         struct msghdr msg;
 557         int idx;
 558         struct iovec io[2];
 559         char levelstr[10];
 560
 561         dst = hapd->ctrl_dst;
 562         if (hapd->ctrl_sock < 0 || dst == NULL)
 563                 return;
 564
 565         os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
 566         io[0].iov_base = levelstr;
 567         io[0].iov_len = os_strlen(levelstr);
 568         io[1].iov_base = (char *) buf;
 569         io[1].iov_len = len;
 570         os_memset(&msg, 0, sizeof(msg));
 571         msg.msg_iov = io;
 572         msg.msg_iovlen = 2;
 573
 574         idx = 0;
 575         while (dst) {
 576                 next = dst->next;
 577                 if (level >= dst->debug_level) {
 578                         wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
 579                                     (u8 *) dst->addr.sun_path, dst->addrlen -
 580                                     offsetof(struct sockaddr_un, sun_path));
 581                         msg.msg_name = &dst->addr;
 582                         msg.msg_namelen = dst->addrlen;
 583                         if (sendmsg(hapd->ctrl_sock, &msg, 0) < 0) {
 584                                 int _errno = errno;
 585                                 wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
 586                                            "%d - %s",
 587                                            idx, errno, strerror(errno));
 588                                 dst->errors++;
 589                                 if (dst->errors > 10 || _errno == ENOENT) {
 590                                         hostapd_ctrl_iface_detach(
 591                                                 hapd, &dst->addr,
 592                                                 dst->addrlen);
 593                                 }
 594                         } else
 595                                 dst->errors = 0;
 596                 }
 597                 idx++;
 598                 dst = next;
 599         }
 600 }
 601
 602 #endif /* CONFIG_NATIVE_WINDOWS */