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 libwebsockets_get_random(struct libwebsocket_context *context,
  18                                                              void *buf, int len)
  19 {
  20         return read(context->fd_random, (char *)buf, len);
  21 }
  22
  23 LWS_VISIBLE int lws_send_pipe_choked(struct libwebsocket *wsi)
  24 {
  25         struct libwebsocket_pollfd fds;
  26
  27         /* treat the fact we got a truncated send pending as if we're choked */
  28         if (wsi->truncated_send_len)
  29                 return 1;
  30
  31         fds.fd = wsi->sock;
  32         fds.events = POLLOUT;
  33         fds.revents = 0;
  34
  35         if (poll(&fds, 1, 0) != 1)
  36                 return 1;
  37
  38         if ((fds.revents & POLLOUT) == 0)
  39                 return 1;
  40
  41         /* okay to send another packet without blocking */
  42
  43         return 0;
  44 }
  45
  46 LWS_VISIBLE int
  47 lws_poll_listen_fd(struct libwebsocket_pollfd *fd)
  48 {
  49         return poll(fd, 1, 0);
  50 }
  51
  52 /*
  53  * This is just used to interrupt poll waiting
  54  * we don't have to do anything with it.
  55  */
  56 static void lws_sigusr2(int sig)
  57 {
  58 }
  59
  60 /**
  61  * libwebsocket_cancel_service() - Cancel servicing of pending websocket activity
  62  * @context:    Websocket context
  63  *
  64  *      This function let a call to libwebsocket_service() waiting for a timeout
  65  *      immediately return.
  66  */
  67 LWS_VISIBLE void
  68 libwebsocket_cancel_service(struct libwebsocket_context *context)
  69 {
  70         char buf = 0;
  71
  72         if (write(context->dummy_pipe_fds[1], &buf, sizeof(buf)) != 1)
  73                 lwsl_err("Cannot write to dummy pipe");
  74 }
  75
  76 LWS_VISIBLE void lwsl_emit_syslog(int level, const char *line)
  77 {
  78         int syslog_level = LOG_DEBUG;
  79
  80         switch (level) {
  81         case LLL_ERR:
  82                 syslog_level = LOG_ERR;
  83                 break;
  84         case LLL_WARN:
  85                 syslog_level = LOG_WARNING;
  86                 break;
  87         case LLL_NOTICE:
  88                 syslog_level = LOG_NOTICE;
  89                 break;
  90         case LLL_INFO:
  91                 syslog_level = LOG_INFO;
  92                 break;
  93         }
  94         syslog(syslog_level, "%s", line);
  95 }
  96
  97 LWS_VISIBLE int
  98 lws_plat_service(struct libwebsocket_context *context, int timeout_ms)
  99 {
 100         int n;
 101         int m;
 102         char buf;
 103 #ifdef LWS_OPENSSL_SUPPORT
 104         struct libwebsocket *wsi, *wsi_next;
 105 #endif
 106
 107         /* stay dead once we are dead */
 108
 109         if (!context)
 110                 return 1;
 111
 112         lws_libev_run(context);
 113
 114         context->service_tid = context->protocols[0].callback(context, NULL,
 115                                      LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
 116
 117 #ifdef LWS_OPENSSL_SUPPORT
 118         /* if we know we have non-network pending data, do not wait in poll */
 119         if (lws_ssl_anybody_has_buffered_read(context))
 120                 timeout_ms = 0;
 121 #endif
 122         n = poll(context->fds, context->fds_count, timeout_ms);
 123         context->service_tid = 0;
 124
 125 #ifdef LWS_OPENSSL_SUPPORT
 126         if (!lws_ssl_anybody_has_buffered_read(context) && n == 0) {
 127 #else
 128         if (n == 0) /* poll timeout */ {
 129 #endif
 130                 libwebsocket_service_fd(context, NULL);
 131                 return 0;
 132         }
 133
 134         if (n < 0) {
 135                 if (LWS_ERRNO != LWS_EINTR)
 136                         return -1;
 137                 return 0;
 138         }
 139
 140 #ifdef LWS_OPENSSL_SUPPORT
 141         /*
 142          * For all guys with buffered SSL read data already saved up, if they
 143          * are not flowcontrolled, fake their POLLIN status so they'll get
 144          * service to use up the buffered incoming data, even though their
 145          * network socket may have nothing
 146          */
 147
 148         wsi = context->pending_read_list;
 149         while (wsi) {
 150                 wsi_next = wsi->pending_read_list_next;
 151        context->fds[wsi->position_in_fds_table].revents |=
 152                context->fds[wsi->position_in_fds_table].events & POLLIN;
 153        if (context->fds[wsi->position_in_fds_table].revents & POLLIN) {
 154                         /*
 155                          * he's going to get serviced now, take him off the
 156                          * list of guys with buffered SSL.  If he still has some
 157                          * at the end of the service, he'll get put back on the
 158                          * list then.
 159                          */
 160                         lws_ssl_remove_wsi_from_buffered_list(context, wsi);
 161                 }
 162                 wsi = wsi_next;
 163         }
 164 #endif
 165
 166         /* any socket with events to service? */
 167
 168         for (n = 0; n < context->fds_count; n++) {
 169
 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 = libwebsocket_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 libwebsocket_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 LWS_VISIBLE int
 275 lws_plat_init_lookup(struct libwebsocket_context *context)
 276 {
 277         context->lws_lookup = lws_zalloc(sizeof(struct libwebsocket *) * context->max_fds);
 278         if (context->lws_lookup == NULL) {
 279                 lwsl_err(
 280                   "Unable to allocate lws_lookup array for %d connections\n",
 281                                                               context->max_fds);
 282                 return 1;
 283         }
 284
 285         return 0;
 286 }
 287
 288 LWS_VISIBLE int
 289 lws_plat_init_fd_tables(struct libwebsocket_context *context)
 290 {
 291         context->fd_random = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 292         if (context->fd_random < 0) {
 293                 lwsl_err("Unable to open random device %s %d\n",
 294                                     SYSTEM_RANDOM_FILEPATH, context->fd_random);
 295                 return 1;
 296         }
 297
 298         if (lws_libev_init_fd_table(context))
 299                 /* libev handled it instead */
 300                 return 0;
 301
 302         if (pipe(context->dummy_pipe_fds)) {
 303                 lwsl_err("Unable to create pipe\n");
 304                 return 1;
 305         }
 306
 307         /* use the read end of pipe as first item */
 308         context->fds[0].fd = context->dummy_pipe_fds[0];
 309         context->fds[0].events = LWS_POLLIN;
 310         context->fds[0].revents = 0;
 311         context->fds_count = 1;
 312
 313         return 0;
 314 }
 315
 316 static void sigpipe_handler(int x)
 317 {
 318 }
 319
 320
 321 LWS_VISIBLE int
 322 lws_plat_context_early_init(void)
 323 {
 324         sigset_t mask;
 325
 326         signal(SIGUSR2, lws_sigusr2);
 327         sigemptyset(&mask);
 328         sigaddset(&mask, SIGUSR2);
 329
 330         sigprocmask(SIG_BLOCK, &mask, NULL);
 331
 332         signal(SIGPIPE, sigpipe_handler);
 333
 334         return 0;
 335 }
 336
 337 LWS_VISIBLE void
 338 lws_plat_context_early_destroy(struct libwebsocket_context *context)
 339 {
 340 }
 341
 342 LWS_VISIBLE void
 343 lws_plat_context_late_destroy(struct libwebsocket_context *context)
 344 {
 345         if (context->lws_lookup)
 346                 lws_free(context->lws_lookup);
 347
 348         close(context->dummy_pipe_fds[0]);
 349         close(context->dummy_pipe_fds[1]);
 350         close(context->fd_random);
 351 }
 352
 353 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 354
 355 LWS_VISIBLE int
 356 interface_to_sa(struct libwebsocket_context *context,
 357                 const char *ifname, struct sockaddr_in *addr, size_t addrlen)
 358 {
 359         int rc = -1;
 360
 361         struct ifaddrs *ifr;
 362         struct ifaddrs *ifc;
 363 #ifdef LWS_USE_IPV6
 364         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 365 #endif
 366
 367         getifaddrs(&ifr);
 368         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 369                 if (!ifc->ifa_addr)
 370                         continue;
 371
 372                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 373
 374                 if (strcmp(ifc->ifa_name, ifname))
 375                         continue;
 376
 377                 switch (ifc->ifa_addr->sa_family) {
 378                 case AF_INET:
 379 #ifdef LWS_USE_IPV6
 380                         if (LWS_IPV6_ENABLED(context)) {
 381                                 /* map IPv4 to IPv6 */
 382                                 bzero((char *)&addr6->sin6_addr,
 383                                                 sizeof(struct in6_addr));
 384                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 385                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 386                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 387                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 388                                                         sizeof(struct in_addr));
 389                         } else
 390 #endif
 391                                 memcpy(addr,
 392                                         (struct sockaddr_in *)ifc->ifa_addr,
 393                                                     sizeof(struct sockaddr_in));
 394                         break;
 395 #ifdef LWS_USE_IPV6
 396                 case AF_INET6:
 397                         memcpy(&addr6->sin6_addr,
 398                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 399                                                        sizeof(struct in6_addr));
 400                         break;
 401 #endif
 402                 default:
 403                         continue;
 404                 }
 405                 rc = 0;
 406         }
 407
 408         freeifaddrs(ifr);
 409
 410         if (rc == -1) {
 411                 /* check if bind to IP adddress */
 412 #ifdef LWS_USE_IPV6
 413                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 414                         rc = 0;
 415                 else
 416 #endif
 417                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 418                         rc = 0;
 419         }
 420
 421         return rc;
 422 }
 423
 424 LWS_VISIBLE void
 425 lws_plat_insert_socket_into_fds(struct libwebsocket_context *context,
 426                                                        struct libwebsocket *wsi)
 427 {
 428         lws_libev_io(context, wsi, LWS_EV_START | LWS_EV_READ);
 429         context->fds[context->fds_count++].revents = 0;
 430 }
 431
 432 LWS_VISIBLE void
 433 lws_plat_delete_socket_from_fds(struct libwebsocket_context *context,
 434                                                 struct libwebsocket *wsi, int m)
 435 {
 436 }
 437
 438 LWS_VISIBLE void
 439 lws_plat_service_periodic(struct libwebsocket_context *context)
 440 {
 441         /* if our parent went down, don't linger around */
 442         if (context->started_with_parent &&
 443                               kill(context->started_with_parent, 0) < 0)
 444                 kill(getpid(), SIGTERM);
 445 }
 446
 447 LWS_VISIBLE int
 448 lws_plat_change_pollfd(struct libwebsocket_context *context,
 449                       struct libwebsocket *wsi, struct libwebsocket_pollfd *pfd)
 450 {
 451         return 0;
 452 }
 453
 454 LWS_VISIBLE int
 455 lws_plat_open_file(const char* filename, unsigned long* filelen)
 456 {
 457         struct stat stat_buf;
 458         int ret = open(filename, O_RDONLY);
 459
 460         if (ret < 0)
 461                 return LWS_INVALID_FILE;
 462
 463         if (fstat(ret, &stat_buf) < 0) {
 464                 close(ret);
 465                 return LWS_INVALID_FILE;
 466         }
 467         *filelen = stat_buf.st_size;
 468         return ret;
 469 }
 470
 471 LWS_VISIBLE const char *
 472 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 473 {
 474         return inet_ntop(af, src, dst, cnt);
 475 }