lib/lws-plat-unix.c

   1 #include "private-libwebsockets.h"
   2
   3 #include <pwd.h>
   4 #include <grp.h>
   5
   6 /*
   7  * included from libwebsockets.c for unix builds
   8  */
   9
  10 unsigned long long time_in_microseconds(void)
  11 {
  12         struct timeval tv;
  13         gettimeofday(&tv, NULL);
  14         return ((unsigned long long)tv.tv_sec * 1000000LL) + tv.tv_usec;
  15 }
  16
  17 LWS_VISIBLE int
  18 lws_get_random(struct lws_context *context, void *buf, int len)
  19 {
  20         return read(context->fd_random, (char *)buf, len);
  21 }
  22
  23 LWS_VISIBLE int
  24 lws_send_pipe_choked(struct lws *wsi)
  25 {
  26         struct lws_pollfd fds;
  27
  28         /* treat the fact we got a truncated send pending as if we're choked */
  29         if (wsi->trunc_len)
  30                 return 1;
  31
  32         fds.fd = wsi->sock;
  33         fds.events = POLLOUT;
  34         fds.revents = 0;
  35
  36         if (poll(&fds, 1, 0) != 1)
  37                 return 1;
  38
  39         if ((fds.revents & POLLOUT) == 0)
  40                 return 1;
  41
  42         /* okay to send another packet without blocking */
  43
  44         return 0;
  45 }
  46
  47 LWS_VISIBLE int
  48 lws_poll_listen_fd(struct lws_pollfd *fd)
  49 {
  50         return poll(fd, 1, 0);
  51 }
  52
  53 /*
  54  * This is just used to interrupt poll waiting
  55  * we don't have to do anything with it.
  56  */
  57 static void
  58 lws_sigusr2(int sig)
  59 {
  60 }
  61
  62 /**
  63  * lws_cancel_service_pt() - Cancel servicing of pending socket activity
  64  *                              on one thread
  65  * @wsi:        Cancel service on the thread this wsi is serviced by
  66  *
  67  *      This function let a call to lws_service() waiting for a timeout
  68  *      immediately return.
  69  */
  70 LWS_VISIBLE void
  71 lws_cancel_service_pt(struct lws *wsi)
  72 {
  73         struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
  74         char buf = 0;
  75
  76         if (write(pt->dummy_pipe_fds[1], &buf, sizeof(buf)) != 1)
  77                 lwsl_err("Cannot write to dummy pipe");
  78 }
  79
  80 /**
  81  * lws_cancel_service() - Cancel ALL servicing of pending socket activity
  82  * @context:    Websocket context
  83  *
  84  *      This function let a call to lws_service() waiting for a timeout
  85  *      immediately return.
  86  */
  87 LWS_VISIBLE void
  88 lws_cancel_service(struct lws_context *context)
  89 {
  90         struct lws_context_per_thread *pt = &context->pt[0];
  91         char buf = 0, m = context->count_threads;
  92
  93         while (m--) {
  94                 if (write(pt->dummy_pipe_fds[1], &buf, sizeof(buf)) != 1)
  95                         lwsl_err("Cannot write to dummy pipe");
  96                 pt++;
  97         }
  98 }
  99
 100 LWS_VISIBLE void lwsl_emit_syslog(int level, const char *line)
 101 {
 102         int syslog_level = LOG_DEBUG;
 103
 104         switch (level) {
 105         case LLL_ERR:
 106                 syslog_level = LOG_ERR;
 107                 break;
 108         case LLL_WARN:
 109                 syslog_level = LOG_WARNING;
 110                 break;
 111         case LLL_NOTICE:
 112                 syslog_level = LOG_NOTICE;
 113                 break;
 114         case LLL_INFO:
 115                 syslog_level = LOG_INFO;
 116                 break;
 117         }
 118         syslog(syslog_level, "%s", line);
 119 }
 120
 121 LWS_VISIBLE int
 122 lws_plat_service_tsi(struct lws_context *context, int timeout_ms, int tsi)
 123 {
 124         struct lws_context_per_thread *pt = &context->pt[tsi];
 125         struct lws *wsi;
 126         int n, m, c;
 127         char buf;
 128 #ifdef LWS_OPENSSL_SUPPORT
 129         struct lws *wsi_next;
 130 #endif
 131
 132         /* stay dead once we are dead */
 133
 134         if (!context)
 135                 return 1;
 136
 137         lws_libev_run(context);
 138
 139         if (!context->service_tid_detected) {
 140                 struct lws _lws;
 141
 142                 memset(&_lws, 0, sizeof(_lws));
 143                 _lws.context = context;
 144
 145                 context->service_tid_detected = context->protocols[0].callback(
 146                         &_lws, LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
 147         }
 148         context->service_tid = context->service_tid_detected;
 149
 150         /* if we know we are draining rx ext, do not wait in poll */
 151         if (pt->rx_draining_ext_list)
 152                 timeout_ms = 0;
 153
 154 #ifdef LWS_OPENSSL_SUPPORT
 155         /* if we know we have non-network pending data, do not wait in poll */
 156         if (lws_ssl_anybody_has_buffered_read_tsi(context, tsi)) {
 157                 timeout_ms = 0;
 158                 lwsl_err("ssl buffered read\n");
 159         }
 160 #endif
 161
 162         n = poll(pt->fds, pt->fds_count, timeout_ms);
 163
 164 #ifdef LWS_OPENSSL_SUPPORT
 165         if (!pt->rx_draining_ext_list &&
 166             !lws_ssl_anybody_has_buffered_read_tsi(context, tsi) && !n) {
 167 #else
 168         if (!pt->rx_draining_ext_list && !n) /* poll timeout */ {
 169 #endif
 170                 lws_service_fd_tsi(context, NULL, tsi);
 171                 return 0;
 172         }
 173
 174         if (n < 0) {
 175                 if (LWS_ERRNO != LWS_EINTR)
 176                         return -1;
 177                 return 0;
 178         }
 179
 180         /*
 181          * For all guys with already-available ext data to drain, if they are
 182          * not flowcontrolled, fake their POLLIN status
 183          */
 184         wsi = pt->rx_draining_ext_list;
 185         while (wsi) {
 186                 pt->fds[wsi->position_in_fds_table].revents |=
 187                         pt->fds[wsi->position_in_fds_table].events & POLLIN;
 188                 wsi = wsi->u.ws.rx_draining_ext_list;
 189         }
 190
 191 #ifdef LWS_OPENSSL_SUPPORT
 192         /*
 193          * For all guys with buffered SSL read data already saved up, if they
 194          * are not flowcontrolled, fake their POLLIN status so they'll get
 195          * service to use up the buffered incoming data, even though their
 196          * network socket may have nothing
 197          */
 198
 199         wsi = pt->pending_read_list;
 200         while (wsi) {
 201                 wsi_next = wsi->pending_read_list_next;
 202                 pt->fds[wsi->position_in_fds_table].revents |=
 203                         pt->fds[wsi->position_in_fds_table].events & POLLIN;
 204                 if (pt->fds[wsi->position_in_fds_table].revents & POLLIN)
 205                         /*
 206                          * he's going to get serviced now, take him off the
 207                          * list of guys with buffered SSL.  If he still has some
 208                          * at the end of the service, he'll get put back on the
 209                          * list then.
 210                          */
 211                         lws_ssl_remove_wsi_from_buffered_list(wsi);
 212
 213                 wsi = wsi_next;
 214         }
 215 #endif
 216
 217         /* any socket with events to service? */
 218
 219         c = n;
 220         for (n = 0; n < pt->fds_count && c; n++) {
 221                 if (!pt->fds[n].revents)
 222                         continue;
 223
 224                 c--;
 225
 226                 if (pt->fds[n].fd == pt->dummy_pipe_fds[0]) {
 227                         if (read(pt->fds[n].fd, &buf, 1) != 1)
 228                                 lwsl_err("Cannot read from dummy pipe.");
 229                         continue;
 230                 }
 231
 232                 m = lws_service_fd_tsi(context, &pt->fds[n], tsi);
 233                 if (m < 0)
 234                         return -1;
 235                 /* if something closed, retry this slot */
 236                 if (m)
 237                         n--;
 238         }
 239
 240         return 0;
 241 }
 242
 243 LWS_VISIBLE int
 244 lws_plat_service(struct lws_context *context, int timeout_ms)
 245 {
 246         return lws_plat_service_tsi(context, timeout_ms, 0);
 247 }
 248
 249 LWS_VISIBLE int
 250 lws_plat_set_socket_options(struct lws_context *context, int fd)
 251 {
 252         int optval = 1;
 253         socklen_t optlen = sizeof(optval);
 254
 255 #if defined(__APPLE__) || \
 256     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
 257     defined(__NetBSD__) || \
 258     defined(__OpenBSD__)
 259         struct protoent *tcp_proto;
 260 #endif
 261
 262         if (context->ka_time) {
 263                 /* enable keepalive on this socket */
 264                 optval = 1;
 265                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
 266                                (const void *)&optval, optlen) < 0)
 267                         return 1;
 268
 269 #if defined(__APPLE__) || \
 270     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
 271     defined(__NetBSD__) || \
 272         defined(__CYGWIN__) || defined(__OpenBSD__)
 273
 274                 /*
 275                  * didn't find a way to set these per-socket, need to
 276                  * tune kernel systemwide values
 277                  */
 278 #else
 279                 /* set the keepalive conditions we want on it too */
 280                 optval = context->ka_time;
 281                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE,
 282                                (const void *)&optval, optlen) < 0)
 283                         return 1;
 284
 285                 optval = context->ka_interval;
 286                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL,
 287                                (const void *)&optval, optlen) < 0)
 288                         return 1;
 289
 290                 optval = context->ka_probes;
 291                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT,
 292                                (const void *)&optval, optlen) < 0)
 293                         return 1;
 294 #endif
 295         }
 296
 297         /* Disable Nagle */
 298         optval = 1;
 299 #if !defined(__APPLE__) && \
 300     !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) && \
 301     !defined(__NetBSD__) && \
 302     !defined(__OpenBSD__)
 303         if (setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
 304                 return 1;
 305 #else
 306         tcp_proto = getprotobyname("TCP");
 307         if (setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, &optval, optlen) < 0)
 308                 return 1;
 309 #endif
 310
 311         /* We are nonblocking... */
 312         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
 313                 return 1;
 314
 315         return 0;
 316 }
 317
 318 LWS_VISIBLE void
 319 lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
 320 {
 321         if (info->uid != -1) {
 322                 struct passwd *p = getpwuid(info->uid);
 323
 324                 if (p) {
 325                         initgroups(p->pw_name, info->gid);
 326                         if (setuid(info->uid))
 327                                 lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
 328                         else
 329                                 lwsl_notice(" Set privs to user '%s'\n", p->pw_name);
 330                 } else
 331                         lwsl_warn("getpwuid: unable to find uid %d", info->uid);
 332         }
 333         if (info->gid != -1)
 334                 if (setgid(info->gid))
 335                         lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
 336
 337 }
 338
 339 static void
 340 sigpipe_handler(int x)
 341 {
 342 }
 343
 344 LWS_VISIBLE int
 345 lws_plat_context_early_init(void)
 346 {
 347         sigset_t mask;
 348
 349         signal(SIGUSR2, lws_sigusr2);
 350         sigemptyset(&mask);
 351         sigaddset(&mask, SIGUSR2);
 352
 353         sigprocmask(SIG_BLOCK, &mask, NULL);
 354
 355         signal(SIGPIPE, sigpipe_handler);
 356
 357         return 0;
 358 }
 359
 360 LWS_VISIBLE void
 361 lws_plat_context_early_destroy(struct lws_context *context)
 362 {
 363 }
 364
 365 LWS_VISIBLE void
 366 lws_plat_context_late_destroy(struct lws_context *context)
 367 {
 368         struct lws_context_per_thread *pt = &context->pt[0];
 369         int m = context->count_threads;
 370
 371         if (context->lws_lookup)
 372                 lws_free(context->lws_lookup);
 373
 374         while (m--) {
 375                 close(pt->dummy_pipe_fds[0]);
 376                 close(pt->dummy_pipe_fds[1]);
 377                 pt++;
 378         }
 379         close(context->fd_random);
 380 }
 381
 382 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 383
 384 LWS_VISIBLE int
 385 lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr, size_t addrlen)
 386 {
 387         int rc = -1;
 388
 389         struct ifaddrs *ifr;
 390         struct ifaddrs *ifc;
 391 #ifdef LWS_USE_IPV6
 392         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 393 #endif
 394
 395         getifaddrs(&ifr);
 396         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 397                 if (!ifc->ifa_addr)
 398                         continue;
 399
 400                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 401
 402                 if (strcmp(ifc->ifa_name, ifname))
 403                         continue;
 404
 405                 switch (ifc->ifa_addr->sa_family) {
 406                 case AF_INET:
 407 #ifdef LWS_USE_IPV6
 408                         if (ipv6) {
 409                                 /* map IPv4 to IPv6 */
 410                                 bzero((char *)&addr6->sin6_addr,
 411                                                 sizeof(struct in6_addr));
 412                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 413                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 414                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 415                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 416                                                         sizeof(struct in_addr));
 417                         } else
 418 #endif
 419                                 memcpy(addr,
 420                                         (struct sockaddr_in *)ifc->ifa_addr,
 421                                                     sizeof(struct sockaddr_in));
 422                         break;
 423 #ifdef LWS_USE_IPV6
 424                 case AF_INET6:
 425                         memcpy(&addr6->sin6_addr,
 426                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 427                                                        sizeof(struct in6_addr));
 428                         break;
 429 #endif
 430                 default:
 431                         continue;
 432                 }
 433                 rc = 0;
 434         }
 435
 436         freeifaddrs(ifr);
 437
 438         if (rc == -1) {
 439                 /* check if bind to IP adddress */
 440 #ifdef LWS_USE_IPV6
 441                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 442                         rc = 0;
 443                 else
 444 #endif
 445                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 446                         rc = 0;
 447         }
 448
 449         return rc;
 450 }
 451
 452 LWS_VISIBLE void
 453 lws_plat_insert_socket_into_fds(struct lws_context *context, struct lws *wsi)
 454 {
 455         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 456
 457         lws_libev_io(wsi, LWS_EV_START | LWS_EV_READ);
 458         pt->fds[pt->fds_count++].revents = 0;
 459 }
 460
 461 LWS_VISIBLE void
 462 lws_plat_delete_socket_from_fds(struct lws_context *context,
 463                                                 struct lws *wsi, int m)
 464 {
 465         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 466         pt->fds_count--;
 467 }
 468
 469 LWS_VISIBLE void
 470 lws_plat_service_periodic(struct lws_context *context)
 471 {
 472         /* if our parent went down, don't linger around */
 473         if (context->started_with_parent &&
 474             kill(context->started_with_parent, 0) < 0)
 475                 kill(getpid(), SIGTERM);
 476 }
 477
 478 LWS_VISIBLE int
 479 lws_plat_change_pollfd(struct lws_context *context,
 480                       struct lws *wsi, struct lws_pollfd *pfd)
 481 {
 482         return 0;
 483 }
 484
 485 LWS_VISIBLE const char *
 486 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 487 {
 488         return inet_ntop(af, src, dst, cnt);
 489 }
 490
 491 static lws_filefd_type
 492 _lws_plat_file_open(struct lws *wsi, const char *filename,
 493                     unsigned long *filelen, int flags)
 494 {
 495         struct stat stat_buf;
 496         int ret = open(filename, flags, 0664);
 497
 498         if (ret < 0)
 499                 return LWS_INVALID_FILE;
 500
 501         if (fstat(ret, &stat_buf) < 0) {
 502                 close(ret);
 503                 return LWS_INVALID_FILE;
 504         }
 505         *filelen = stat_buf.st_size;
 506         return ret;
 507 }
 508
 509 static int
 510 _lws_plat_file_close(struct lws *wsi, lws_filefd_type fd)
 511 {
 512         return close(fd);
 513 }
 514
 515 unsigned long
 516 _lws_plat_file_seek_cur(struct lws *wsi, lws_filefd_type fd, long offset)
 517 {
 518         return lseek(fd, offset, SEEK_CUR);
 519 }
 520
 521 static int
 522 _lws_plat_file_read(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
 523                     unsigned char *buf, unsigned long len)
 524 {
 525         long n;
 526
 527         n = read((int)fd, buf, len);
 528         if (n == -1) {
 529                 *amount = 0;
 530                 return -1;
 531         }
 532
 533         *amount = n;
 534
 535         return 0;
 536 }
 537
 538 static int
 539 _lws_plat_file_write(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
 540                      unsigned char *buf, unsigned long len)
 541 {
 542         long n;
 543
 544         n = write((int)fd, buf, len);
 545         if (n == -1) {
 546                 *amount = 0;
 547                 return -1;
 548         }
 549
 550         *amount = n;
 551
 552         return 0;
 553 }
 554
 555 LWS_VISIBLE int
 556 lws_plat_init(struct lws_context *context,
 557               struct lws_context_creation_info *info)
 558 {
 559         struct lws_context_per_thread *pt = &context->pt[0];
 560         int n = context->count_threads, fd;
 561
 562         /* master context has the global fd lookup array */
 563         context->lws_lookup = lws_zalloc(sizeof(struct lws *) *
 564                                          context->max_fds);
 565         if (context->lws_lookup == NULL) {
 566                 lwsl_err("OOM on lws_lookup array for %d connections\n",
 567                          context->max_fds);
 568                 return 1;
 569         }
 570
 571         lwsl_notice(" mem: platform fd map: %5u bytes\n",
 572                     sizeof(struct lws *) * context->max_fds);
 573         fd = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 574
 575         context->fd_random = fd;
 576         if (context->fd_random < 0) {
 577                 lwsl_err("Unable to open random device %s %d\n",
 578                          SYSTEM_RANDOM_FILEPATH, context->fd_random);
 579                 return 1;
 580         }
 581
 582         if (!lws_libev_init_fd_table(context)) {
 583                 /* otherwise libev handled it instead */
 584
 585                 while (n--) {
 586                         if (pipe(pt->dummy_pipe_fds)) {
 587                                 lwsl_err("Unable to create pipe\n");
 588                                 return 1;
 589                         }
 590
 591                         /* use the read end of pipe as first item */
 592                         pt->fds[0].fd = pt->dummy_pipe_fds[0];
 593                         pt->fds[0].events = LWS_POLLIN;
 594                         pt->fds[0].revents = 0;
 595                         pt->fds_count = 1;
 596                         pt++;
 597                 }
 598         }
 599
 600         context->fops.open      = _lws_plat_file_open;
 601         context->fops.close     = _lws_plat_file_close;
 602         context->fops.seek_cur  = _lws_plat_file_seek_cur;
 603         context->fops.read      = _lws_plat_file_read;
 604         context->fops.write     = _lws_plat_file_write;
 605
 606         return 0;
 607 }