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