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