lib/lws-plat-unix.c

   1 #include "private-libwebsockets.h"
   2
   3 #include <pwd.h>
   4 #include <grp.h>
   5
   6 #ifdef LWS_WITH_PLUGINS
   7 #include <dlfcn.h>
   8 #endif
   9 #include <dirent.h>
  10
  11
  12 /*
  13  * included from libwebsockets.c for unix builds
  14  */
  15
  16 unsigned long long time_in_microseconds(void)
  17 {
  18         struct timeval tv;
  19         gettimeofday(&tv, NULL);
  20         return ((unsigned long long)tv.tv_sec * 1000000LL) + tv.tv_usec;
  21 }
  22
  23 LWS_VISIBLE int
  24 lws_get_random(struct lws_context *context, void *buf, int len)
  25 {
  26         return read(context->fd_random, (char *)buf, len);
  27 }
  28
  29 LWS_VISIBLE int
  30 lws_send_pipe_choked(struct lws *wsi)
  31 {
  32         struct lws_pollfd fds;
  33
  34         /* treat the fact we got a truncated send pending as if we're choked */
  35         if (wsi->trunc_len)
  36                 return 1;
  37
  38         fds.fd = wsi->sock;
  39         fds.events = POLLOUT;
  40         fds.revents = 0;
  41
  42         if (poll(&fds, 1, 0) != 1)
  43                 return 1;
  44
  45         if ((fds.revents & POLLOUT) == 0)
  46                 return 1;
  47
  48         /* okay to send another packet without blocking */
  49
  50         return 0;
  51 }
  52
  53 LWS_VISIBLE int
  54 lws_poll_listen_fd(struct lws_pollfd *fd)
  55 {
  56         return poll(fd, 1, 0);
  57 }
  58
  59 LWS_VISIBLE void
  60 lws_cancel_service_pt(struct lws *wsi)
  61 {
  62         struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
  63         char buf = 0;
  64
  65         if (write(pt->dummy_pipe_fds[1], &buf, sizeof(buf)) != 1)
  66                 lwsl_err("Cannot write to dummy pipe");
  67 }
  68
  69 LWS_VISIBLE void
  70 lws_cancel_service(struct lws_context *context)
  71 {
  72         struct lws_context_per_thread *pt = &context->pt[0];
  73         char buf = 0, m = context->count_threads;
  74
  75         while (m--) {
  76                 if (write(pt->dummy_pipe_fds[1], &buf, sizeof(buf)) != 1)
  77                         lwsl_err("Cannot write to dummy pipe");
  78                 pt++;
  79         }
  80 }
  81
  82 LWS_VISIBLE void lwsl_emit_syslog(int level, const char *line)
  83 {
  84         int syslog_level = LOG_DEBUG;
  85
  86         switch (level) {
  87         case LLL_ERR:
  88                 syslog_level = LOG_ERR;
  89                 break;
  90         case LLL_WARN:
  91                 syslog_level = LOG_WARNING;
  92                 break;
  93         case LLL_NOTICE:
  94                 syslog_level = LOG_NOTICE;
  95                 break;
  96         case LLL_INFO:
  97                 syslog_level = LOG_INFO;
  98                 break;
  99         }
 100         syslog(syslog_level, "%s", line);
 101 }
 102
 103 LWS_VISIBLE int
 104 lws_plat_service_tsi(struct lws_context *context, int timeout_ms, int tsi)
 105 {
 106         struct lws_context_per_thread *pt = &context->pt[tsi];
 107         int n = -1, m, c;
 108         char buf;
 109
 110         /* stay dead once we are dead */
 111
 112         if (!context || !context->vhost_list)
 113                 return 1;
 114
 115         if (timeout_ms < 0)
 116                 goto faked_service;
 117
 118         lws_libev_run(context, tsi);
 119         lws_libuv_run(context, tsi);
 120
 121         if (!context->service_tid_detected) {
 122                 struct lws _lws;
 123
 124                 memset(&_lws, 0, sizeof(_lws));
 125                 _lws.context = context;
 126
 127                 context->service_tid_detected =
 128                         context->vhost_list->protocols[0].callback(
 129                         &_lws, LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
 130         }
 131         context->service_tid = context->service_tid_detected;
 132
 133         timeout_ms = lws_service_adjust_timeout(context, timeout_ms, tsi);
 134
 135         n = poll(pt->fds, pt->fds_count, timeout_ms);
 136
 137 #ifdef LWS_OPENSSL_SUPPORT
 138         if (!pt->rx_draining_ext_list &&
 139             !lws_ssl_anybody_has_buffered_read_tsi(context, tsi) && !n) {
 140 #else
 141         if (!pt->rx_draining_ext_list && !n) /* poll timeout */ {
 142 #endif
 143                 lws_service_fd_tsi(context, NULL, tsi);
 144                 return 0;
 145         }
 146
 147 faked_service:
 148         m = lws_service_flag_pending(context, tsi);
 149         if (m)
 150                 c = -1; /* unknown limit */
 151         else
 152                 if (n < 0) {
 153                         if (LWS_ERRNO != LWS_EINTR)
 154                                 return -1;
 155                         return 0;
 156                 } else
 157                         c = n;
 158
 159         /* any socket with events to service? */
 160         for (n = 0; n < pt->fds_count && c; n++) {
 161                 if (!pt->fds[n].revents)
 162                         continue;
 163
 164                 c--;
 165
 166                 if (pt->fds[n].fd == pt->dummy_pipe_fds[0]) {
 167                         if (read(pt->fds[n].fd, &buf, 1) != 1)
 168                                 lwsl_err("Cannot read from dummy pipe.");
 169                         continue;
 170                 }
 171
 172                 m = lws_service_fd_tsi(context, &pt->fds[n], tsi);
 173                 if (m < 0)
 174                         return -1;
 175                 /* if something closed, retry this slot */
 176                 if (m)
 177                         n--;
 178         }
 179
 180         return 0;
 181 }
 182
 183 LWS_VISIBLE int
 184 lws_plat_service(struct lws_context *context, int timeout_ms)
 185 {
 186         return lws_plat_service_tsi(context, timeout_ms, 0);
 187 }
 188
 189 LWS_VISIBLE int
 190 lws_plat_set_socket_options(struct lws_vhost *vhost, int fd)
 191 {
 192         int optval = 1;
 193         socklen_t optlen = sizeof(optval);
 194
 195 #if defined(__APPLE__) || \
 196     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
 197     defined(__NetBSD__) || \
 198     defined(__OpenBSD__)
 199         struct protoent *tcp_proto;
 200 #endif
 201
 202         if (vhost->ka_time) {
 203                 /* enable keepalive on this socket */
 204                 optval = 1;
 205                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
 206                                (const void *)&optval, optlen) < 0)
 207                         return 1;
 208
 209 #if defined(__APPLE__) || \
 210     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
 211     defined(__NetBSD__) || \
 212         defined(__CYGWIN__) || defined(__OpenBSD__)
 213
 214                 /*
 215                  * didn't find a way to set these per-socket, need to
 216                  * tune kernel systemwide values
 217                  */
 218 #else
 219                 /* set the keepalive conditions we want on it too */
 220                 optval = vhost->ka_time;
 221                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE,
 222                                (const void *)&optval, optlen) < 0)
 223                         return 1;
 224
 225                 optval = vhost->ka_interval;
 226                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL,
 227                                (const void *)&optval, optlen) < 0)
 228                         return 1;
 229
 230                 optval = vhost->ka_probes;
 231                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT,
 232                                (const void *)&optval, optlen) < 0)
 233                         return 1;
 234 #endif
 235         }
 236
 237         /* Disable Nagle */
 238         optval = 1;
 239 #if !defined(__APPLE__) && \
 240     !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) && \
 241     !defined(__NetBSD__) && \
 242     !defined(__OpenBSD__)
 243         if (setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
 244                 return 1;
 245 #else
 246         tcp_proto = getprotobyname("TCP");
 247         if (setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, &optval, optlen) < 0)
 248                 return 1;
 249 #endif
 250
 251         /* We are nonblocking... */
 252         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
 253                 return 1;
 254
 255         return 0;
 256 }
 257
 258 LWS_VISIBLE void
 259 lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
 260 {
 261         if (info->gid != -1)
 262                 if (setgid(info->gid))
 263                         lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
 264
 265         if (info->uid != -1) {
 266                 struct passwd *p = getpwuid(info->uid);
 267
 268                 if (p) {
 269                         initgroups(p->pw_name, info->gid);
 270                         if (setuid(info->uid))
 271                                 lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
 272                         else
 273                                 lwsl_notice("Set privs to user '%s'\n", p->pw_name);
 274                 } else
 275                         lwsl_warn("getpwuid: unable to find uid %d", info->uid);
 276         }
 277 }
 278
 279 #ifdef LWS_WITH_PLUGINS
 280
 281 #if defined(LWS_USE_LIBUV) && UV_VERSION_MAJOR > 0
 282
 283 /* libuv.c implements these in a cross-platform way */
 284
 285 #else
 286
 287 static int filter(const struct dirent *ent)
 288 {
 289         if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
 290                 return 0;
 291
 292         return 1;
 293 }
 294
 295 LWS_VISIBLE int
 296 lws_plat_plugins_init(struct lws_context * context, const char * const *d)
 297 {
 298         struct lws_plugin_capability lcaps;
 299         struct lws_plugin *plugin;
 300         lws_plugin_init_func initfunc;
 301         struct dirent **namelist;
 302         int n, i, m, ret = 0;
 303         char path[256];
 304         void *l;
 305
 306         lwsl_notice("  Plugins:\n");
 307
 308         while (d && *d) {
 309                 n = scandir(*d, &namelist, filter, alphasort);
 310                 if (n < 0) {
 311                         lwsl_err("Scandir on %s failed\n", *d);
 312                         return 1;
 313                 }
 314
 315                 for (i = 0; i < n; i++) {
 316                         if (strlen(namelist[i]->d_name) < 7)
 317                                 goto inval;
 318
 319                         lwsl_notice("   %s\n", namelist[i]->d_name);
 320
 321                         snprintf(path, sizeof(path) - 1, "%s/%s", *d,
 322                                  namelist[i]->d_name);
 323                         l = dlopen(path, RTLD_NOW);
 324                         if (!l) {
 325                                 lwsl_err("Error loading DSO: %s\n", dlerror());
 326                                 while (i++ < n)
 327                                         free(namelist[i]);
 328                                 goto bail;
 329                         }
 330                         /* we could open it, can we get his init function? */
 331                         m = snprintf(path, sizeof(path) - 1, "init_%s",
 332                                      namelist[i]->d_name + 3 /* snip lib... */);
 333                         path[m - 3] = '\0'; /* snip the .so */
 334                         initfunc = dlsym(l, path);
 335                         if (!initfunc) {
 336                                 lwsl_err("Failed to get init on %s: %s",
 337                                                 namelist[i]->d_name, dlerror());
 338                                 dlclose(l);
 339                         }
 340                         lcaps.api_magic = LWS_PLUGIN_API_MAGIC;
 341                         m = initfunc(context, &lcaps);
 342                         if (m) {
 343                                 lwsl_err("Initializing %s failed %d\n",
 344                                         namelist[i]->d_name, m);
 345                                 dlclose(l);
 346                                 goto skip;
 347                         }
 348
 349                         plugin = lws_malloc(sizeof(*plugin));
 350                         if (!plugin) {
 351                                 lwsl_err("OOM\n");
 352                                 goto bail;
 353                         }
 354                         plugin->list = context->plugin_list;
 355                         context->plugin_list = plugin;
 356                         strncpy(plugin->name, namelist[i]->d_name, sizeof(plugin->name) - 1);
 357                         plugin->name[sizeof(plugin->name) - 1] = '\0';
 358                         plugin->l = l;
 359                         plugin->caps = lcaps;
 360                         context->plugin_protocol_count += lcaps.count_protocols;
 361                         context->plugin_extension_count += lcaps.count_extensions;
 362
 363                         free(namelist[i]);
 364                         continue;
 365
 366         skip:
 367                         dlclose(l);
 368         inval:
 369                         free(namelist[i]);
 370                 }
 371                 free(namelist);
 372                 d++;
 373         }
 374
 375 bail:
 376         free(namelist);
 377
 378         return ret;
 379 }
 380
 381 LWS_VISIBLE int
 382 lws_plat_plugins_destroy(struct lws_context * context)
 383 {
 384         struct lws_plugin *plugin = context->plugin_list, *p;
 385         lws_plugin_destroy_func func;
 386         char path[256];
 387         int m;
 388
 389         if (!plugin)
 390                 return 0;
 391
 392         lwsl_notice("%s\n", __func__);
 393
 394         while (plugin) {
 395                 p = plugin;
 396                 m = snprintf(path, sizeof(path) - 1, "destroy_%s", plugin->name + 3);
 397                 path[m - 3] = '\0';
 398                 func = dlsym(plugin->l, path);
 399                 if (!func) {
 400                         lwsl_err("Failed to get destroy on %s: %s",
 401                                         plugin->name, dlerror());
 402                         goto next;
 403                 }
 404                 m = func(context);
 405                 if (m)
 406                         lwsl_err("Initializing %s failed %d\n",
 407                                 plugin->name, m);
 408 next:
 409                 dlclose(p->l);
 410                 plugin = p->list;
 411                 p->list = NULL;
 412                 free(p);
 413         }
 414
 415         context->plugin_list = NULL;
 416
 417         return 0;
 418 }
 419
 420 #endif
 421 #endif
 422
 423
 424 #if 0
 425 static void
 426 sigabrt_handler(int x)
 427 {
 428         printf("%s\n", __func__);
 429         //*(char *)0 = 0;
 430 }
 431 #endif
 432
 433 LWS_VISIBLE int
 434 lws_plat_context_early_init(void)
 435 {
 436         signal(SIGPIPE, SIG_IGN);
 437
 438 //      signal(SIGABRT, sigabrt_handler);
 439
 440         return 0;
 441 }
 442
 443 LWS_VISIBLE void
 444 lws_plat_context_early_destroy(struct lws_context *context)
 445 {
 446 }
 447
 448 LWS_VISIBLE void
 449 lws_plat_context_late_destroy(struct lws_context *context)
 450 {
 451         struct lws_context_per_thread *pt = &context->pt[0];
 452         int m = context->count_threads;
 453
 454 #ifdef LWS_WITH_PLUGINS
 455         if (context->plugin_list)
 456                 lws_plat_plugins_destroy(context);
 457 #endif
 458
 459         if (context->lws_lookup)
 460                 lws_free(context->lws_lookup);
 461
 462         while (m--) {
 463                 close(pt->dummy_pipe_fds[0]);
 464                 close(pt->dummy_pipe_fds[1]);
 465                 pt++;
 466         }
 467         close(context->fd_random);
 468 }
 469
 470 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 471
 472 LWS_VISIBLE int
 473 lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
 474                     size_t addrlen)
 475 {
 476         int rc = -1;
 477
 478         struct ifaddrs *ifr;
 479         struct ifaddrs *ifc;
 480 #ifdef LWS_USE_IPV6
 481         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 482 #endif
 483
 484         getifaddrs(&ifr);
 485         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 486                 if (!ifc->ifa_addr)
 487                         continue;
 488
 489                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 490
 491                 if (strcmp(ifc->ifa_name, ifname))
 492                         continue;
 493
 494                 switch (ifc->ifa_addr->sa_family) {
 495                 case AF_INET:
 496 #ifdef LWS_USE_IPV6
 497                         if (ipv6) {
 498                                 /* map IPv4 to IPv6 */
 499                                 bzero((char *)&addr6->sin6_addr,
 500                                                 sizeof(struct in6_addr));
 501                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 502                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 503                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 504                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 505                                                         sizeof(struct in_addr));
 506                         } else
 507 #endif
 508                                 memcpy(addr,
 509                                         (struct sockaddr_in *)ifc->ifa_addr,
 510                                                     sizeof(struct sockaddr_in));
 511                         break;
 512 #ifdef LWS_USE_IPV6
 513                 case AF_INET6:
 514                         memcpy(&addr6->sin6_addr,
 515                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 516                                                        sizeof(struct in6_addr));
 517                         break;
 518 #endif
 519                 default:
 520                         continue;
 521                 }
 522                 rc = 0;
 523         }
 524
 525         freeifaddrs(ifr);
 526
 527         if (rc == -1) {
 528                 /* check if bind to IP adddress */
 529 #ifdef LWS_USE_IPV6
 530                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 531                         rc = 0;
 532                 else
 533 #endif
 534                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 535                         rc = 0;
 536         }
 537
 538         return rc;
 539 }
 540
 541 LWS_VISIBLE void
 542 lws_plat_insert_socket_into_fds(struct lws_context *context, struct lws *wsi)
 543 {
 544         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 545
 546         lws_libev_io(wsi, LWS_EV_START | LWS_EV_READ);
 547         lws_libuv_io(wsi, LWS_EV_START | LWS_EV_READ);
 548
 549         pt->fds[pt->fds_count++].revents = 0;
 550 }
 551
 552 LWS_VISIBLE void
 553 lws_plat_delete_socket_from_fds(struct lws_context *context,
 554                                                 struct lws *wsi, int m)
 555 {
 556         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 557
 558         lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
 559         lws_libuv_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
 560
 561         pt->fds_count--;
 562 }
 563
 564 LWS_VISIBLE void
 565 lws_plat_service_periodic(struct lws_context *context)
 566 {
 567         /* if our parent went down, don't linger around */
 568         if (context->started_with_parent &&
 569             kill(context->started_with_parent, 0) < 0)
 570                 kill(getpid(), SIGTERM);
 571 }
 572
 573 LWS_VISIBLE int
 574 lws_plat_change_pollfd(struct lws_context *context,
 575                       struct lws *wsi, struct lws_pollfd *pfd)
 576 {
 577         return 0;
 578 }
 579
 580 LWS_VISIBLE const char *
 581 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 582 {
 583         return inet_ntop(af, src, dst, cnt);
 584 }
 585
 586 static lws_filefd_type
 587 _lws_plat_file_open(struct lws *wsi, const char *filename,
 588                     unsigned long *filelen, int flags)
 589 {
 590         struct stat stat_buf;
 591         int ret = open(filename, flags, 0664);
 592
 593         if (ret < 0)
 594                 return LWS_INVALID_FILE;
 595
 596         if (fstat(ret, &stat_buf) < 0) {
 597                 close(ret);
 598                 return LWS_INVALID_FILE;
 599         }
 600         *filelen = stat_buf.st_size;
 601         return ret;
 602 }
 603
 604 static int
 605 _lws_plat_file_close(struct lws *wsi, lws_filefd_type fd)
 606 {
 607         return close(fd);
 608 }
 609
 610 unsigned long
 611 _lws_plat_file_seek_cur(struct lws *wsi, lws_filefd_type fd, long offset)
 612 {
 613         return lseek(fd, offset, SEEK_CUR);
 614 }
 615
 616 static int
 617 _lws_plat_file_read(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
 618                     unsigned char *buf, unsigned long len)
 619 {
 620         long n;
 621
 622         n = read((int)fd, buf, len);
 623         if (n == -1) {
 624                 *amount = 0;
 625                 return -1;
 626         }
 627
 628         *amount = n;
 629
 630         return 0;
 631 }
 632
 633 static int
 634 _lws_plat_file_write(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
 635                      unsigned char *buf, unsigned long len)
 636 {
 637         long n;
 638
 639         n = write((int)fd, buf, len);
 640         if (n == -1) {
 641                 *amount = 0;
 642                 return -1;
 643         }
 644
 645         *amount = n;
 646
 647         return 0;
 648 }
 649
 650
 651 LWS_VISIBLE int
 652 lws_plat_init(struct lws_context *context,
 653               struct lws_context_creation_info *info)
 654 {
 655         struct lws_context_per_thread *pt = &context->pt[0];
 656         int n = context->count_threads, fd;
 657
 658         /* master context has the global fd lookup array */
 659         context->lws_lookup = lws_zalloc(sizeof(struct lws *) *
 660                                          context->max_fds);
 661         if (context->lws_lookup == NULL) {
 662                 lwsl_err("OOM on lws_lookup array for %d connections\n",
 663                          context->max_fds);
 664                 return 1;
 665         }
 666
 667         lwsl_notice(" mem: platform fd map: %5u bytes\n",
 668                     sizeof(struct lws *) * context->max_fds);
 669         fd = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 670
 671         context->fd_random = fd;
 672         if (context->fd_random < 0) {
 673                 lwsl_err("Unable to open random device %s %d\n",
 674                          SYSTEM_RANDOM_FILEPATH, context->fd_random);
 675                 return 1;
 676         }
 677
 678         if (!lws_libev_init_fd_table(context) &&
 679             !lws_libuv_init_fd_table(context)) {
 680                 /* otherwise libev handled it instead */
 681
 682                 while (n--) {
 683                         if (pipe(pt->dummy_pipe_fds)) {
 684                                 lwsl_err("Unable to create pipe\n");
 685                                 return 1;
 686                         }
 687
 688                         /* use the read end of pipe as first item */
 689                         pt->fds[0].fd = pt->dummy_pipe_fds[0];
 690                         pt->fds[0].events = LWS_POLLIN;
 691                         pt->fds[0].revents = 0;
 692                         pt->fds_count = 1;
 693                         pt++;
 694                 }
 695         }
 696
 697         context->fops.open      = _lws_plat_file_open;
 698         context->fops.close     = _lws_plat_file_close;
 699         context->fops.seek_cur  = _lws_plat_file_seek_cur;
 700         context->fops.read      = _lws_plat_file_read;
 701         context->fops.write     = _lws_plat_file_write;
 702
 703 #ifdef LWS_WITH_PLUGINS
 704         if (info->plugin_dirs)
 705                 lws_plat_plugins_init(context, info->plugin_dirs);
 706 #endif
 707
 708         return 0;
 709 }