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 lws_sigusr2(int sig)
  58 {
  59 }
  60
  61 /**
  62  * lws_cancel_service() - Cancel servicing of pending websocket activity
  63  * @context:    Websocket context
  64  *
  65  *      This function let a call to lws_service() waiting for a timeout
  66  *      immediately return.
  67  */
  68 LWS_VISIBLE void
  69 lws_cancel_service(struct lws_context *context)
  70 {
  71         char buf = 0;
  72
  73         if (write(context->dummy_pipe_fds[1], &buf, sizeof(buf)) != 1)
  74                 lwsl_err("Cannot write to dummy pipe");
  75 }
  76
  77 LWS_VISIBLE void lwsl_emit_syslog(int level, const char *line)
  78 {
  79         int syslog_level = LOG_DEBUG;
  80
  81         switch (level) {
  82         case LLL_ERR:
  83                 syslog_level = LOG_ERR;
  84                 break;
  85         case LLL_WARN:
  86                 syslog_level = LOG_WARNING;
  87                 break;
  88         case LLL_NOTICE:
  89                 syslog_level = LOG_NOTICE;
  90                 break;
  91         case LLL_INFO:
  92                 syslog_level = LOG_INFO;
  93                 break;
  94         }
  95         syslog(syslog_level, "%s", line);
  96 }
  97
  98 LWS_VISIBLE int
  99 lws_plat_service(struct lws_context *context, int timeout_ms)
 100 {
 101         int n;
 102         int m;
 103         char buf;
 104 #ifdef LWS_OPENSSL_SUPPORT
 105         struct lws *wsi, *wsi_next;
 106 #endif
 107
 108         /* stay dead once we are dead */
 109
 110         if (!context)
 111                 return 1;
 112
 113         lws_libev_run(context);
 114
 115         if (!context->service_tid_detected) {
 116                 struct lws _lws;
 117
 118                 memset(&_lws, 0, sizeof(_lws));
 119                 _lws.context = context;
 120
 121                 context->service_tid_detected = context->protocols[0].callback(
 122                         &_lws, LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
 123         }
 124         context->service_tid = context->service_tid_detected;
 125
 126 #ifdef LWS_OPENSSL_SUPPORT
 127         /* if we know we have non-network pending data, do not wait in poll */
 128         if (lws_ssl_anybody_has_buffered_read(context))
 129                 timeout_ms = 0;
 130 #endif
 131         n = poll(context->fds, context->fds_count, timeout_ms);
 132         context->service_tid = 0;
 133
 134 #ifdef LWS_OPENSSL_SUPPORT
 135         if (!lws_ssl_anybody_has_buffered_read(context) && n == 0) {
 136 #else
 137         if (n == 0) /* poll timeout */ {
 138 #endif
 139                 lws_service_fd(context, NULL);
 140                 return 0;
 141         }
 142
 143         if (n < 0) {
 144                 if (LWS_ERRNO != LWS_EINTR)
 145                         return -1;
 146                 return 0;
 147         }
 148
 149 #ifdef LWS_OPENSSL_SUPPORT
 150         /*
 151          * For all guys with buffered SSL read data already saved up, if they
 152          * are not flowcontrolled, fake their POLLIN status so they'll get
 153          * service to use up the buffered incoming data, even though their
 154          * network socket may have nothing
 155          */
 156
 157         wsi = context->pending_read_list;
 158         while (wsi) {
 159                 wsi_next = wsi->pending_read_list_next;
 160                 context->fds[wsi->position_in_fds_table].revents |=
 161                         context->fds[wsi->position_in_fds_table].events & POLLIN;
 162                 if (context->fds[wsi->position_in_fds_table].revents & POLLIN)
 163                         /*
 164                          * he's going to get serviced now, take him off the
 165                          * list of guys with buffered SSL.  If he still has some
 166                          * at the end of the service, he'll get put back on the
 167                          * list then.
 168                          */
 169                         lws_ssl_remove_wsi_from_buffered_list(wsi);
 170
 171                 wsi = wsi_next;
 172         }
 173 #endif
 174
 175         /* any socket with events to service? */
 176
 177         for (n = 0; n < context->fds_count; n++) {
 178                 if (!context->fds[n].revents)
 179                         continue;
 180
 181                 if (context->fds[n].fd == context->dummy_pipe_fds[0]) {
 182                         if (read(context->fds[n].fd, &buf, 1) != 1)
 183                                 lwsl_err("Cannot read from dummy pipe.");
 184                         continue;
 185                 }
 186
 187                 m = lws_service_fd(context, &context->fds[n]);
 188                 if (m < 0)
 189                         return -1;
 190                 /* if something closed, retry this slot */
 191                 if (m)
 192                         n--;
 193         }
 194
 195         return 0;
 196 }
 197
 198 LWS_VISIBLE int
 199 lws_plat_set_socket_options(struct lws_context *context, int fd)
 200 {
 201         int optval = 1;
 202         socklen_t optlen = sizeof(optval);
 203
 204 #if defined(__APPLE__) || \
 205     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
 206     defined(__NetBSD__) || \
 207     defined(__OpenBSD__)
 208         struct protoent *tcp_proto;
 209 #endif
 210
 211         if (context->ka_time) {
 212                 /* enable keepalive on this socket */
 213                 optval = 1;
 214                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
 215                                (const void *)&optval, optlen) < 0)
 216                         return 1;
 217
 218 #if defined(__APPLE__) || \
 219     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
 220     defined(__NetBSD__) || \
 221         defined(__CYGWIN__) || defined(__OpenBSD__)
 222
 223                 /*
 224                  * didn't find a way to set these per-socket, need to
 225                  * tune kernel systemwide values
 226                  */
 227 #else
 228                 /* set the keepalive conditions we want on it too */
 229                 optval = context->ka_time;
 230                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE,
 231                                (const void *)&optval, optlen) < 0)
 232                         return 1;
 233
 234                 optval = context->ka_interval;
 235                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL,
 236                                (const void *)&optval, optlen) < 0)
 237                         return 1;
 238
 239                 optval = context->ka_probes;
 240                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT,
 241                                (const void *)&optval, optlen) < 0)
 242                         return 1;
 243 #endif
 244         }
 245
 246         /* Disable Nagle */
 247         optval = 1;
 248 #if !defined(__APPLE__) && \
 249     !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) && \
 250     !defined(__NetBSD__) && \
 251     !defined(__OpenBSD__)
 252         if (setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
 253                 return 1;
 254 #else
 255         tcp_proto = getprotobyname("TCP");
 256         if (setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, &optval, optlen) < 0)
 257                 return 1;
 258 #endif
 259
 260         /* We are nonblocking... */
 261         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
 262                 return 1;
 263
 264         return 0;
 265 }
 266
 267 LWS_VISIBLE void
 268 lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
 269 {
 270         if (info->uid != -1) {
 271                 struct passwd *p = getpwuid(info->uid);
 272
 273                 if (p) {
 274                         initgroups(p->pw_name, info->gid);
 275                         if (setuid(info->uid))
 276                                 lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
 277                         else
 278                                 lwsl_notice(" Set privs to user '%s'\n", p->pw_name);
 279                 } else
 280                         lwsl_warn("getpwuid: unable to find uid %d", info->uid);
 281         }
 282         if (info->gid != -1)
 283                 if (setgid(info->gid))
 284                         lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
 285
 286 }
 287
 288 static void sigpipe_handler(int x)
 289 {
 290 }
 291
 292 LWS_VISIBLE int
 293 lws_plat_context_early_init(void)
 294 {
 295         sigset_t mask;
 296
 297         signal(SIGUSR2, lws_sigusr2);
 298         sigemptyset(&mask);
 299         sigaddset(&mask, SIGUSR2);
 300
 301         sigprocmask(SIG_BLOCK, &mask, NULL);
 302
 303         signal(SIGPIPE, sigpipe_handler);
 304
 305         return 0;
 306 }
 307
 308 LWS_VISIBLE void
 309 lws_plat_context_early_destroy(struct lws_context *context)
 310 {
 311 }
 312
 313 LWS_VISIBLE void
 314 lws_plat_context_late_destroy(struct lws_context *context)
 315 {
 316         if (context->lws_lookup)
 317                 lws_free(context->lws_lookup);
 318
 319         close(context->dummy_pipe_fds[0]);
 320         close(context->dummy_pipe_fds[1]);
 321         close(context->fd_random);
 322 }
 323
 324 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 325
 326 LWS_VISIBLE int
 327 interface_to_sa(struct lws_context *context,
 328                 const char *ifname, struct sockaddr_in *addr, size_t addrlen)
 329 {
 330         int rc = -1;
 331
 332         struct ifaddrs *ifr;
 333         struct ifaddrs *ifc;
 334 #ifdef LWS_USE_IPV6
 335         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 336 #endif
 337
 338         getifaddrs(&ifr);
 339         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 340                 if (!ifc->ifa_addr)
 341                         continue;
 342
 343                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 344
 345                 if (strcmp(ifc->ifa_name, ifname))
 346                         continue;
 347
 348                 switch (ifc->ifa_addr->sa_family) {
 349                 case AF_INET:
 350 #ifdef LWS_USE_IPV6
 351                         if (LWS_IPV6_ENABLED(context)) {
 352                                 /* map IPv4 to IPv6 */
 353                                 bzero((char *)&addr6->sin6_addr,
 354                                                 sizeof(struct in6_addr));
 355                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 356                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 357                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 358                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 359                                                         sizeof(struct in_addr));
 360                         } else
 361 #endif
 362                                 memcpy(addr,
 363                                         (struct sockaddr_in *)ifc->ifa_addr,
 364                                                     sizeof(struct sockaddr_in));
 365                         break;
 366 #ifdef LWS_USE_IPV6
 367                 case AF_INET6:
 368                         memcpy(&addr6->sin6_addr,
 369                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 370                                                        sizeof(struct in6_addr));
 371                         break;
 372 #endif
 373                 default:
 374                         continue;
 375                 }
 376                 rc = 0;
 377         }
 378
 379         freeifaddrs(ifr);
 380
 381         if (rc == -1) {
 382                 /* check if bind to IP adddress */
 383 #ifdef LWS_USE_IPV6
 384                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 385                         rc = 0;
 386                 else
 387 #endif
 388                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 389                         rc = 0;
 390         }
 391
 392         return rc;
 393 }
 394
 395 LWS_VISIBLE void
 396 lws_plat_insert_socket_into_fds(struct lws_context *context,
 397                                                        struct lws *wsi)
 398 {
 399         lws_libev_io(wsi, LWS_EV_START | LWS_EV_READ);
 400         context->fds[context->fds_count++].revents = 0;
 401 }
 402
 403 LWS_VISIBLE void
 404 lws_plat_delete_socket_from_fds(struct lws_context *context,
 405                                                 struct lws *wsi, int m)
 406 {
 407 }
 408
 409 LWS_VISIBLE void
 410 lws_plat_service_periodic(struct lws_context *context)
 411 {
 412         /* if our parent went down, don't linger around */
 413         if (context->started_with_parent &&
 414             kill(context->started_with_parent, 0) < 0)
 415                 kill(getpid(), SIGTERM);
 416 }
 417
 418 LWS_VISIBLE int
 419 lws_plat_change_pollfd(struct lws_context *context,
 420                       struct lws *wsi, struct lws_pollfd *pfd)
 421 {
 422         return 0;
 423 }
 424
 425 LWS_VISIBLE const char *
 426 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 427 {
 428         return inet_ntop(af, src, dst, cnt);
 429 }
 430
 431 static lws_filefd_type
 432 _lws_plat_file_open(struct lws *wsi, const char *filename,
 433                     unsigned long *filelen, int flags)
 434 {
 435         struct stat stat_buf;
 436         int ret = open(filename, flags, 0664);
 437
 438         if (ret < 0)
 439                 return LWS_INVALID_FILE;
 440
 441         if (fstat(ret, &stat_buf) < 0) {
 442                 close(ret);
 443                 return LWS_INVALID_FILE;
 444         }
 445         *filelen = stat_buf.st_size;
 446         return ret;
 447 }
 448
 449 static int
 450 _lws_plat_file_close(struct lws *wsi, lws_filefd_type fd)
 451 {
 452         return close(fd);
 453 }
 454
 455 unsigned long
 456 _lws_plat_file_seek_cur(struct lws *wsi, lws_filefd_type fd, long offset)
 457 {
 458         return lseek(fd, offset, SEEK_CUR);
 459 }
 460
 461 static int
 462 _lws_plat_file_read(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
 463                     unsigned char *buf, unsigned long len)
 464 {
 465         long n;
 466
 467         n = read((int)fd, buf, len);
 468         if (n == -1) {
 469                 *amount = 0;
 470                 return -1;
 471         }
 472
 473         *amount = n;
 474
 475         return 0;
 476 }
 477
 478 static int
 479 _lws_plat_file_write(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
 480                      unsigned char *buf, unsigned long len)
 481 {
 482         long n;
 483
 484         n = write((int)fd, buf, len);
 485         if (n == -1) {
 486                 *amount = 0;
 487                 return -1;
 488         }
 489
 490         *amount = n;
 491
 492         return 0;
 493 }
 494
 495 LWS_VISIBLE int
 496 lws_plat_init(struct lws_context *context,
 497               struct lws_context_creation_info *info)
 498 {
 499         context->lws_lookup = lws_zalloc(sizeof(struct lws *) * context->max_fds);
 500         if (context->lws_lookup == NULL) {
 501                 lwsl_err(
 502                   "Unable to allocate lws_lookup array for %d connections\n",
 503                                                               context->max_fds);
 504                 return 1;
 505         }
 506
 507         lwsl_notice(" mem: platform fd map: %5u bytes\n",
 508                     sizeof(struct lws *) * context->max_fds);
 509
 510         context->fd_random = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 511         if (context->fd_random < 0) {
 512                 lwsl_err("Unable to open random device %s %d\n",
 513                                     SYSTEM_RANDOM_FILEPATH, context->fd_random);
 514                 return 1;
 515         }
 516
 517         if (!lws_libev_init_fd_table(context)) {
 518                 /* otherwise libev handled it instead */
 519
 520                 if (pipe(context->dummy_pipe_fds)) {
 521                         lwsl_err("Unable to create pipe\n");
 522                         return 1;
 523                 }
 524         }
 525
 526         /* use the read end of pipe as first item */
 527         context->fds[0].fd = context->dummy_pipe_fds[0];
 528         context->fds[0].events = LWS_POLLIN;
 529         context->fds[0].revents = 0;
 530         context->fds_count = 1;
 531
 532         context->fops.open      = _lws_plat_file_open;
 533         context->fops.close     = _lws_plat_file_close;
 534         context->fops.seek_cur  = _lws_plat_file_seek_cur;
 535         context->fops.read      = _lws_plat_file_read;
 536         context->fops.write     = _lws_plat_file_write;
 537
 538         return 0;
 539 }