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         int n, m, c;
 126         char buf;
 127
 128         /* stay dead once we are dead */
 129
 130         if (!context)
 131                 return 1;
 132
 133         lws_libev_run(context, tsi);
 134         lws_libuv_run(context, tsi);
 135
 136         if (!context->service_tid_detected) {
 137                 struct lws _lws;
 138
 139                 memset(&_lws, 0, sizeof(_lws));
 140                 _lws.context = context;
 141
 142                 context->service_tid_detected = context->protocols[0].callback(
 143                         &_lws, LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
 144         }
 145         context->service_tid = context->service_tid_detected;
 146
 147         timeout_ms = lws_service_adjust_timeout(context, timeout_ms, tsi);
 148
 149         n = poll(pt->fds, pt->fds_count, timeout_ms);
 150
 151 #ifdef LWS_OPENSSL_SUPPORT
 152         if (!pt->rx_draining_ext_list &&
 153             !lws_ssl_anybody_has_buffered_read_tsi(context, tsi) && !n) {
 154 #else
 155         if (!pt->rx_draining_ext_list && !n) /* poll timeout */ {
 156 #endif
 157                 lws_service_fd_tsi(context, NULL, tsi);
 158                 return 0;
 159         }
 160
 161         m = lws_service_flag_pending(context, tsi);
 162         if (m)
 163                 c = -1; /* unknown limit */
 164         else
 165                 if (n < 0) {
 166                         if (LWS_ERRNO != LWS_EINTR)
 167                                 return -1;
 168                         return 0;
 169                 } else
 170                         c = n;
 171
 172         /* any socket with events to service? */
 173         for (n = 0; n < pt->fds_count && c; n++) {
 174                 if (!pt->fds[n].revents)
 175                         continue;
 176
 177                 c--;
 178
 179                 if (pt->fds[n].fd == pt->dummy_pipe_fds[0]) {
 180                         if (read(pt->fds[n].fd, &buf, 1) != 1)
 181                                 lwsl_err("Cannot read from dummy pipe.");
 182                         continue;
 183                 }
 184
 185                 m = lws_service_fd_tsi(context, &pt->fds[n], tsi);
 186                 if (m < 0)
 187                         return -1;
 188                 /* if something closed, retry this slot */
 189                 if (m)
 190                         n--;
 191         }
 192
 193         return 0;
 194 }
 195
 196 LWS_VISIBLE int
 197 lws_plat_service(struct lws_context *context, int timeout_ms)
 198 {
 199         return lws_plat_service_tsi(context, timeout_ms, 0);
 200 }
 201
 202 LWS_VISIBLE int
 203 lws_plat_set_socket_options(struct lws_context *context, int fd)
 204 {
 205         int optval = 1;
 206         socklen_t optlen = sizeof(optval);
 207
 208 #if defined(__APPLE__) || \
 209     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
 210     defined(__NetBSD__) || \
 211     defined(__OpenBSD__)
 212         struct protoent *tcp_proto;
 213 #endif
 214
 215         if (context->ka_time) {
 216                 /* enable keepalive on this socket */
 217                 optval = 1;
 218                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
 219                                (const void *)&optval, optlen) < 0)
 220                         return 1;
 221
 222 #if defined(__APPLE__) || \
 223     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
 224     defined(__NetBSD__) || \
 225         defined(__CYGWIN__) || defined(__OpenBSD__)
 226
 227                 /*
 228                  * didn't find a way to set these per-socket, need to
 229                  * tune kernel systemwide values
 230                  */
 231 #else
 232                 /* set the keepalive conditions we want on it too */
 233                 optval = context->ka_time;
 234                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE,
 235                                (const void *)&optval, optlen) < 0)
 236                         return 1;
 237
 238                 optval = context->ka_interval;
 239                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL,
 240                                (const void *)&optval, optlen) < 0)
 241                         return 1;
 242
 243                 optval = context->ka_probes;
 244                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT,
 245                                (const void *)&optval, optlen) < 0)
 246                         return 1;
 247 #endif
 248         }
 249
 250         /* Disable Nagle */
 251         optval = 1;
 252 #if !defined(__APPLE__) && \
 253     !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) && \
 254     !defined(__NetBSD__) && \
 255     !defined(__OpenBSD__)
 256         if (setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
 257                 return 1;
 258 #else
 259         tcp_proto = getprotobyname("TCP");
 260         if (setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, &optval, optlen) < 0)
 261                 return 1;
 262 #endif
 263
 264         /* We are nonblocking... */
 265         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
 266                 return 1;
 267
 268         return 0;
 269 }
 270
 271 LWS_VISIBLE void
 272 lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
 273 {
 274         if (info->gid != -1)
 275                 if (setgid(info->gid))
 276                         lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
 277
 278         if (info->uid != -1) {
 279                 struct passwd *p = getpwuid(info->uid);
 280
 281                 if (p) {
 282                         initgroups(p->pw_name, info->gid);
 283                         if (setuid(info->uid))
 284                                 lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
 285                         else
 286                                 lwsl_notice(" Set privs to user '%s'\n", p->pw_name);
 287                 } else
 288                         lwsl_warn("getpwuid: unable to find uid %d", info->uid);
 289         }
 290 }
 291
 292 static void
 293 sigpipe_handler(int x)
 294 {
 295 }
 296
 297 LWS_VISIBLE int
 298 lws_plat_context_early_init(void)
 299 {
 300         sigset_t mask;
 301
 302         signal(SIGUSR2, lws_sigusr2);
 303         sigemptyset(&mask);
 304         sigaddset(&mask, SIGUSR2);
 305
 306         sigprocmask(SIG_BLOCK, &mask, NULL);
 307
 308         signal(SIGPIPE, sigpipe_handler);
 309
 310         return 0;
 311 }
 312
 313 LWS_VISIBLE void
 314 lws_plat_context_early_destroy(struct lws_context *context)
 315 {
 316 }
 317
 318 LWS_VISIBLE void
 319 lws_plat_context_late_destroy(struct lws_context *context)
 320 {
 321         struct lws_context_per_thread *pt = &context->pt[0];
 322         int m = context->count_threads;
 323
 324         if (context->lws_lookup)
 325                 lws_free(context->lws_lookup);
 326
 327         while (m--) {
 328                 close(pt->dummy_pipe_fds[0]);
 329                 close(pt->dummy_pipe_fds[1]);
 330                 pt++;
 331         }
 332         close(context->fd_random);
 333 }
 334
 335 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 336
 337 LWS_VISIBLE int
 338 lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
 339                     size_t addrlen)
 340 {
 341         int rc = -1;
 342
 343         struct ifaddrs *ifr;
 344         struct ifaddrs *ifc;
 345 #ifdef LWS_USE_IPV6
 346         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 347 #endif
 348
 349         getifaddrs(&ifr);
 350         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 351                 if (!ifc->ifa_addr)
 352                         continue;
 353
 354                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 355
 356                 if (strcmp(ifc->ifa_name, ifname))
 357                         continue;
 358
 359                 switch (ifc->ifa_addr->sa_family) {
 360                 case AF_INET:
 361 #ifdef LWS_USE_IPV6
 362                         if (ipv6) {
 363                                 /* map IPv4 to IPv6 */
 364                                 bzero((char *)&addr6->sin6_addr,
 365                                                 sizeof(struct in6_addr));
 366                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 367                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 368                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 369                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 370                                                         sizeof(struct in_addr));
 371                         } else
 372 #endif
 373                                 memcpy(addr,
 374                                         (struct sockaddr_in *)ifc->ifa_addr,
 375                                                     sizeof(struct sockaddr_in));
 376                         break;
 377 #ifdef LWS_USE_IPV6
 378                 case AF_INET6:
 379                         memcpy(&addr6->sin6_addr,
 380                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 381                                                        sizeof(struct in6_addr));
 382                         break;
 383 #endif
 384                 default:
 385                         continue;
 386                 }
 387                 rc = 0;
 388         }
 389
 390         freeifaddrs(ifr);
 391
 392         if (rc == -1) {
 393                 /* check if bind to IP adddress */
 394 #ifdef LWS_USE_IPV6
 395                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 396                         rc = 0;
 397                 else
 398 #endif
 399                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 400                         rc = 0;
 401         }
 402
 403         return rc;
 404 }
 405
 406 LWS_VISIBLE void
 407 lws_plat_insert_socket_into_fds(struct lws_context *context, struct lws *wsi)
 408 {
 409         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 410
 411         lws_libev_io(wsi, LWS_EV_START | LWS_EV_READ);
 412         lws_libuv_io(wsi, LWS_EV_START | LWS_EV_READ);
 413
 414         pt->fds[pt->fds_count++].revents = 0;
 415 }
 416
 417 LWS_VISIBLE void
 418 lws_plat_delete_socket_from_fds(struct lws_context *context,
 419                                                 struct lws *wsi, int m)
 420 {
 421         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 422         pt->fds_count--;
 423 }
 424
 425 LWS_VISIBLE void
 426 lws_plat_service_periodic(struct lws_context *context)
 427 {
 428         /* if our parent went down, don't linger around */
 429         if (context->started_with_parent &&
 430             kill(context->started_with_parent, 0) < 0)
 431                 kill(getpid(), SIGTERM);
 432 }
 433
 434 LWS_VISIBLE int
 435 lws_plat_change_pollfd(struct lws_context *context,
 436                       struct lws *wsi, struct lws_pollfd *pfd)
 437 {
 438         return 0;
 439 }
 440
 441 LWS_VISIBLE const char *
 442 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 443 {
 444         return inet_ntop(af, src, dst, cnt);
 445 }
 446
 447 static lws_filefd_type
 448 _lws_plat_file_open(struct lws *wsi, const char *filename,
 449                     unsigned long *filelen, int flags)
 450 {
 451         struct stat stat_buf;
 452         int ret = open(filename, flags, 0664);
 453
 454         if (ret < 0)
 455                 return LWS_INVALID_FILE;
 456
 457         if (fstat(ret, &stat_buf) < 0) {
 458                 close(ret);
 459                 return LWS_INVALID_FILE;
 460         }
 461         *filelen = stat_buf.st_size;
 462         return ret;
 463 }
 464
 465 static int
 466 _lws_plat_file_close(struct lws *wsi, lws_filefd_type fd)
 467 {
 468         return close(fd);
 469 }
 470
 471 unsigned long
 472 _lws_plat_file_seek_cur(struct lws *wsi, lws_filefd_type fd, long offset)
 473 {
 474         return lseek(fd, offset, SEEK_CUR);
 475 }
 476
 477 static int
 478 _lws_plat_file_read(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
 479                     unsigned char *buf, unsigned long len)
 480 {
 481         long n;
 482
 483         n = read((int)fd, buf, len);
 484         if (n == -1) {
 485                 *amount = 0;
 486                 return -1;
 487         }
 488
 489         *amount = n;
 490
 491         return 0;
 492 }
 493
 494 static int
 495 _lws_plat_file_write(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
 496                      unsigned char *buf, unsigned long len)
 497 {
 498         long n;
 499
 500         n = write((int)fd, buf, len);
 501         if (n == -1) {
 502                 *amount = 0;
 503                 return -1;
 504         }
 505
 506         *amount = n;
 507
 508         return 0;
 509 }
 510
 511 LWS_VISIBLE int
 512 lws_plat_init(struct lws_context *context,
 513               struct lws_context_creation_info *info)
 514 {
 515         struct lws_context_per_thread *pt = &context->pt[0];
 516         int n = context->count_threads, fd;
 517
 518         /* master context has the global fd lookup array */
 519         context->lws_lookup = lws_zalloc(sizeof(struct lws *) *
 520                                          context->max_fds);
 521         if (context->lws_lookup == NULL) {
 522                 lwsl_err("OOM on lws_lookup array for %d connections\n",
 523                          context->max_fds);
 524                 return 1;
 525         }
 526
 527         lwsl_notice(" mem: platform fd map: %5u bytes\n",
 528                     sizeof(struct lws *) * context->max_fds);
 529         fd = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 530
 531         context->fd_random = fd;
 532         if (context->fd_random < 0) {
 533                 lwsl_err("Unable to open random device %s %d\n",
 534                          SYSTEM_RANDOM_FILEPATH, context->fd_random);
 535                 return 1;
 536         }
 537
 538         if (!lws_libev_init_fd_table(context) &&
 539             !lws_libuv_init_fd_table(context)) {
 540                 /* otherwise libev handled it instead */
 541
 542                 while (n--) {
 543                         if (pipe(pt->dummy_pipe_fds)) {
 544                                 lwsl_err("Unable to create pipe\n");
 545                                 return 1;
 546                         }
 547
 548                         /* use the read end of pipe as first item */
 549                         pt->fds[0].fd = pt->dummy_pipe_fds[0];
 550                         pt->fds[0].events = LWS_POLLIN;
 551                         pt->fds[0].revents = 0;
 552                         pt->fds_count = 1;
 553                         pt++;
 554                 }
 555         }
 556
 557         context->fops.open      = _lws_plat_file_open;
 558         context->fops.close     = _lws_plat_file_close;
 559         context->fops.seek_cur  = _lws_plat_file_seek_cur;
 560         context->fops.read      = _lws_plat_file_read;
 561         context->fops.write     = _lws_plat_file_write;
 562
 563         return 0;
 564 }