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__) || defined(__FreeBSD__) || defined(__NetBSD__) || \
 205     defined(__OpenBSD__)
 206         struct protoent *tcp_proto;
 207 #endif
 208
 209         if (context->ka_time) {
 210                 /* enable keepalive on this socket */
 211                 optval = 1;
 212                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
 213                                (const void *)&optval, optlen) < 0)
 214                         return 1;
 215
 216 #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || \
 217         defined(__CYGWIN__) || defined(__OpenBSD__)
 218
 219                 /*
 220                  * didn't find a way to set these per-socket, need to
 221                  * tune kernel systemwide values
 222                  */
 223 #else
 224                 /* set the keepalive conditions we want on it too */
 225                 optval = context->ka_time;
 226                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE,
 227                                (const void *)&optval, optlen) < 0)
 228                         return 1;
 229
 230                 optval = context->ka_interval;
 231                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL,
 232                                (const void *)&optval, optlen) < 0)
 233                         return 1;
 234
 235                 optval = context->ka_probes;
 236                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT,
 237                                (const void *)&optval, optlen) < 0)
 238                         return 1;
 239 #endif
 240         }
 241
 242         /* Disable Nagle */
 243         optval = 1;
 244 #if !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__NetBSD__) && \
 245     !defined(__OpenBSD__)
 246         if (setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
 247                 return 1;
 248 #else
 249         tcp_proto = getprotobyname("TCP");
 250         if (setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, &optval, optlen) < 0)
 251                 return 1;
 252 #endif
 253
 254         /* We are nonblocking... */
 255         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
 256                 return 1;
 257
 258         return 0;
 259 }
 260
 261 LWS_VISIBLE void
 262 lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
 263 {
 264         if (info->uid != -1) {
 265                 struct passwd *p = getpwuid(info->uid);
 266
 267                 if (p) {
 268                         initgroups(p->pw_name, info->gid);
 269                         if (setuid(info->uid))
 270                                 lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
 271                         else
 272                                 lwsl_notice(" Set privs to user '%s'\n", p->pw_name);
 273                 } else
 274                         lwsl_warn("getpwuid: unable to find uid %d", info->uid);
 275         }
 276         if (info->gid != -1)
 277                 if (setgid(info->gid))
 278                         lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
 279
 280 }
 281
 282 static void sigpipe_handler(int x)
 283 {
 284 }
 285
 286 LWS_VISIBLE int
 287 lws_plat_context_early_init(void)
 288 {
 289         sigset_t mask;
 290
 291         signal(SIGUSR2, lws_sigusr2);
 292         sigemptyset(&mask);
 293         sigaddset(&mask, SIGUSR2);
 294
 295         sigprocmask(SIG_BLOCK, &mask, NULL);
 296
 297         signal(SIGPIPE, sigpipe_handler);
 298
 299         return 0;
 300 }
 301
 302 LWS_VISIBLE void
 303 lws_plat_context_early_destroy(struct lws_context *context)
 304 {
 305 }
 306
 307 LWS_VISIBLE void
 308 lws_plat_context_late_destroy(struct lws_context *context)
 309 {
 310         if (context->lws_lookup)
 311                 lws_free(context->lws_lookup);
 312
 313         close(context->dummy_pipe_fds[0]);
 314         close(context->dummy_pipe_fds[1]);
 315         close(context->fd_random);
 316 }
 317
 318 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 319
 320 LWS_VISIBLE int
 321 interface_to_sa(struct lws_context *context,
 322                 const char *ifname, struct sockaddr_in *addr, size_t addrlen)
 323 {
 324         int rc = -1;
 325
 326         struct ifaddrs *ifr;
 327         struct ifaddrs *ifc;
 328 #ifdef LWS_USE_IPV6
 329         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 330 #endif
 331
 332         getifaddrs(&ifr);
 333         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 334                 if (!ifc->ifa_addr)
 335                         continue;
 336
 337                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 338
 339                 if (strcmp(ifc->ifa_name, ifname))
 340                         continue;
 341
 342                 switch (ifc->ifa_addr->sa_family) {
 343                 case AF_INET:
 344 #ifdef LWS_USE_IPV6
 345                         if (LWS_IPV6_ENABLED(context)) {
 346                                 /* map IPv4 to IPv6 */
 347                                 bzero((char *)&addr6->sin6_addr,
 348                                                 sizeof(struct in6_addr));
 349                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 350                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 351                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 352                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 353                                                         sizeof(struct in_addr));
 354                         } else
 355 #endif
 356                                 memcpy(addr,
 357                                         (struct sockaddr_in *)ifc->ifa_addr,
 358                                                     sizeof(struct sockaddr_in));
 359                         break;
 360 #ifdef LWS_USE_IPV6
 361                 case AF_INET6:
 362                         memcpy(&addr6->sin6_addr,
 363                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 364                                                        sizeof(struct in6_addr));
 365                         break;
 366 #endif
 367                 default:
 368                         continue;
 369                 }
 370                 rc = 0;
 371         }
 372
 373         freeifaddrs(ifr);
 374
 375         if (rc == -1) {
 376                 /* check if bind to IP adddress */
 377 #ifdef LWS_USE_IPV6
 378                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 379                         rc = 0;
 380                 else
 381 #endif
 382                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 383                         rc = 0;
 384         }
 385
 386         return rc;
 387 }
 388
 389 LWS_VISIBLE void
 390 lws_plat_insert_socket_into_fds(struct lws_context *context,
 391                                                        struct lws *wsi)
 392 {
 393         lws_libev_io(wsi, LWS_EV_START | LWS_EV_READ);
 394         context->fds[context->fds_count++].revents = 0;
 395 }
 396
 397 LWS_VISIBLE void
 398 lws_plat_delete_socket_from_fds(struct lws_context *context,
 399                                                 struct lws *wsi, int m)
 400 {
 401 }
 402
 403 LWS_VISIBLE void
 404 lws_plat_service_periodic(struct lws_context *context)
 405 {
 406         /* if our parent went down, don't linger around */
 407         if (context->started_with_parent &&
 408             kill(context->started_with_parent, 0) < 0)
 409                 kill(getpid(), SIGTERM);
 410 }
 411
 412 LWS_VISIBLE int
 413 lws_plat_change_pollfd(struct lws_context *context,
 414                       struct lws *wsi, struct lws_pollfd *pfd)
 415 {
 416         return 0;
 417 }
 418
 419 LWS_VISIBLE const char *
 420 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 421 {
 422         return inet_ntop(af, src, dst, cnt);
 423 }
 424
 425 static lws_filefd_type
 426 _lws_plat_file_open(struct lws *wsi, const char *filename,
 427                     unsigned long *filelen, int flags)
 428 {
 429         struct stat stat_buf;
 430         int ret = open(filename, flags, 0664);
 431
 432         if (ret < 0)
 433                 return LWS_INVALID_FILE;
 434
 435         if (fstat(ret, &stat_buf) < 0) {
 436                 close(ret);
 437                 return LWS_INVALID_FILE;
 438         }
 439         *filelen = stat_buf.st_size;
 440         return ret;
 441 }
 442
 443 static int
 444 _lws_plat_file_close(struct lws *wsi, lws_filefd_type fd)
 445 {
 446         return close(fd);
 447 }
 448
 449 unsigned long
 450 _lws_plat_file_seek_cur(struct lws *wsi, lws_filefd_type fd, long offset)
 451 {
 452         return lseek(fd, offset, SEEK_CUR);
 453 }
 454
 455 static int
 456 _lws_plat_file_read(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
 457                     unsigned char *buf, unsigned long len)
 458 {
 459         long n;
 460
 461         n = read((int)fd, buf, len);
 462         if (n == -1) {
 463                 *amount = 0;
 464                 return -1;
 465         }
 466
 467         *amount = n;
 468
 469         return 0;
 470 }
 471
 472 static int
 473 _lws_plat_file_write(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
 474                      unsigned char *buf, unsigned long len)
 475 {
 476         long n;
 477
 478         n = write((int)fd, buf, len);
 479         if (n == -1) {
 480                 *amount = 0;
 481                 return -1;
 482         }
 483
 484         *amount = n;
 485
 486         return 0;
 487 }
 488
 489 LWS_VISIBLE int
 490 lws_plat_init(struct lws_context *context,
 491               struct lws_context_creation_info *info)
 492 {
 493         context->lws_lookup = lws_zalloc(sizeof(struct lws *) * context->max_fds);
 494         if (context->lws_lookup == NULL) {
 495                 lwsl_err(
 496                   "Unable to allocate lws_lookup array for %d connections\n",
 497                                                               context->max_fds);
 498                 return 1;
 499         }
 500
 501         context->fd_random = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 502         if (context->fd_random < 0) {
 503                 lwsl_err("Unable to open random device %s %d\n",
 504                                     SYSTEM_RANDOM_FILEPATH, context->fd_random);
 505                 return 1;
 506         }
 507
 508         if (!lws_libev_init_fd_table(context)) {
 509                 /* otherwise libev handled it instead */
 510
 511                 if (pipe(context->dummy_pipe_fds)) {
 512                         lwsl_err("Unable to create pipe\n");
 513                         return 1;
 514                 }
 515         }
 516
 517         /* use the read end of pipe as first item */
 518         context->fds[0].fd = context->dummy_pipe_fds[0];
 519         context->fds[0].events = LWS_POLLIN;
 520         context->fds[0].revents = 0;
 521         context->fds_count = 1;
 522
 523         context->fops.open      = _lws_plat_file_open;
 524         context->fops.close     = _lws_plat_file_close;
 525         context->fops.seek_cur  = _lws_plat_file_seek_cur;
 526         context->fops.read      = _lws_plat_file_read;
 527         context->fops.write     = _lws_plat_file_write;
 528
 529         return 0;
 530 }