lib/lws-plat-unix.c

   1 #include "private-libwebsockets.h"
   2
   3 /*
   4  * included from libwebsockets.c for unix builds
   5  */
   6
   7 unsigned long long time_in_microseconds(void)
   8 {
   9         struct timeval tv;
  10         gettimeofday(&tv, NULL);
  11         return ((unsigned long long)tv.tv_sec * 1000000LL) + tv.tv_usec;
  12 }
  13
  14 LWS_VISIBLE int libwebsockets_get_random(struct libwebsocket_context *context,
  15                                                              void *buf, int len)
  16 {
  17         return read(context->fd_random, (char *)buf, len);
  18 }
  19
  20 LWS_VISIBLE int lws_send_pipe_choked(struct libwebsocket *wsi)
  21 {
  22         struct libwebsocket_pollfd fds;
  23
  24         /* treat the fact we got a truncated send pending as if we're choked */
  25         if (wsi->truncated_send_len)
  26                 return 1;
  27
  28         fds.fd = wsi->sock;
  29         fds.events = POLLOUT;
  30         fds.revents = 0;
  31
  32         if (poll(&fds, 1, 0) != 1)
  33                 return 1;
  34
  35         if ((fds.revents & POLLOUT) == 0)
  36                 return 1;
  37
  38         /* okay to send another packet without blocking */
  39
  40         return 0;
  41 }
  42
  43 LWS_VISIBLE int
  44 lws_poll_listen_fd(struct libwebsocket_pollfd *fd)
  45 {
  46         return poll(fd, 1, 0);
  47 }
  48
  49 /*
  50  * This is just used to interrupt poll waiting
  51  * we don't have to do anything with it.
  52  */
  53 static void lws_sigusr2(int sig)
  54 {
  55 }
  56
  57 /**
  58  * libwebsocket_cancel_service() - Cancel servicing of pending websocket activity
  59  * @context:    Websocket context
  60  *
  61  *      This function let a call to libwebsocket_service() waiting for a timeout
  62  *      immediately return.
  63  */
  64 LWS_VISIBLE void
  65 libwebsocket_cancel_service(struct libwebsocket_context *context)
  66 {
  67         char buf = 0;
  68
  69         if (write(context->dummy_pipe_fds[1], &buf, sizeof(buf)) != 1)
  70                 lwsl_err("Cannot write to dummy pipe");
  71 }
  72
  73 LWS_VISIBLE void lwsl_emit_syslog(int level, const char *line)
  74 {
  75         int syslog_level = LOG_DEBUG;
  76
  77         switch (level) {
  78         case LLL_ERR:
  79                 syslog_level = LOG_ERR;
  80                 break;
  81         case LLL_WARN:
  82                 syslog_level = LOG_WARNING;
  83                 break;
  84         case LLL_NOTICE:
  85                 syslog_level = LOG_NOTICE;
  86                 break;
  87         case LLL_INFO:
  88                 syslog_level = LOG_INFO;
  89                 break;
  90         }
  91         syslog(syslog_level, "%s", line);
  92 }
  93
  94 LWS_VISIBLE int
  95 lws_plat_service(struct libwebsocket_context *context, int timeout_ms)
  96 {
  97         int n;
  98         int m;
  99         char buf;
 100 #ifdef LWS_OPENSSL_SUPPORT
 101         struct libwebsocket *wsi, *wsi_next;
 102 #endif
 103
 104         /* stay dead once we are dead */
 105
 106         if (!context)
 107                 return 1;
 108
 109         lws_libev_run(context);
 110
 111         context->service_tid = context->protocols[0].callback(context, NULL,
 112                                      LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
 113
 114 #ifdef LWS_OPENSSL_SUPPORT
 115         /* if we know we have non-network pending data, do not wait in poll */
 116         if (lws_ssl_anybody_has_buffered_read(context))
 117                 timeout_ms = 0;
 118 #endif
 119         n = poll(context->fds, context->fds_count, timeout_ms);
 120         context->service_tid = 0;
 121
 122 #ifdef LWS_OPENSSL_SUPPORT
 123         if (!lws_ssl_anybody_has_buffered_read(context) && n == 0) {
 124 #else
 125         if (n == 0) /* poll timeout */ {
 126 #endif
 127                 libwebsocket_service_fd(context, NULL);
 128                 return 0;
 129         }
 130
 131         if (n < 0) {
 132                 if (LWS_ERRNO != LWS_EINTR)
 133                         return -1;
 134                 return 0;
 135         }
 136
 137 #ifdef LWS_OPENSSL_SUPPORT
 138         /*
 139          * For all guys with buffered SSL read data already saved up, if they
 140          * are not flowcontrolled, fake their POLLIN status so they'll get
 141          * service to use up the buffered incoming data, even though their
 142          * network socket may have nothing
 143          */
 144
 145         wsi = context->pending_read_list;
 146         while (wsi) {
 147                 wsi_next = wsi->pending_read_list_next;
 148                 context->fds[wsi->sock].revents |=
 149                                 context->fds[wsi->sock].events & POLLIN;
 150                 if (context->fds[wsi->sock].revents & POLLIN) {
 151                         /*
 152                          * he's going to get serviced now, take him off the
 153                          * list of guys with buffered SSL.  If he still has some
 154                          * at the end of the service, he'll get put back on the
 155                          * list then.
 156                          */
 157                         lws_ssl_remove_wsi_from_buffered_list(context, wsi);
 158                 }
 159                 wsi = wsi_next;
 160         }
 161 #endif
 162
 163         /* any socket with events to service? */
 164
 165         for (n = 0; n < context->fds_count; n++) {
 166
 167                 if (!context->fds[n].revents)
 168                         continue;
 169
 170                 if (context->fds[n].fd == context->dummy_pipe_fds[0]) {
 171                         if (read(context->fds[n].fd, &buf, 1) != 1)
 172                                 lwsl_err("Cannot read from dummy pipe.");
 173                         continue;
 174                 }
 175
 176                 m = libwebsocket_service_fd(context, &context->fds[n]);
 177                 if (m < 0)
 178                         return -1;
 179                 /* if something closed, retry this slot */
 180                 if (m)
 181                         n--;
 182         }
 183
 184         return 0;
 185 }
 186
 187 LWS_VISIBLE int
 188 lws_plat_set_socket_options(struct libwebsocket_context *context, int fd)
 189 {
 190         int optval = 1;
 191         socklen_t optlen = sizeof(optval);
 192
 193 #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || \
 194     defined(__OpenBSD__)
 195         struct protoent *tcp_proto;
 196 #endif
 197
 198         if (context->ka_time) {
 199                 /* enable keepalive on this socket */
 200                 optval = 1;
 201                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
 202                                              (const void *)&optval, optlen) < 0)
 203                         return 1;
 204
 205 #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || \
 206         defined(__CYGWIN__) || defined(__OpenBSD__)
 207
 208                 /*
 209                  * didn't find a way to set these per-socket, need to
 210                  * tune kernel systemwide values
 211                  */
 212 #else
 213                 /* set the keepalive conditions we want on it too */
 214                 optval = context->ka_time;
 215                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE,
 216                                              (const void *)&optval, optlen) < 0)
 217                         return 1;
 218
 219                 optval = context->ka_interval;
 220                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL,
 221                                              (const void *)&optval, optlen) < 0)
 222                         return 1;
 223
 224                 optval = context->ka_probes;
 225                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT,
 226                                              (const void *)&optval, optlen) < 0)
 227                         return 1;
 228 #endif
 229         }
 230
 231         /* Disable Nagle */
 232         optval = 1;
 233 #if !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__NetBSD__) && \
 234     !defined(__OpenBSD__)
 235         if (setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
 236                 return 1;
 237 #else
 238         tcp_proto = getprotobyname("TCP");
 239         if (setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, &optval, optlen) < 0)
 240                 return 1;
 241 #endif
 242
 243         /* We are nonblocking... */
 244         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
 245                 return 1;
 246
 247         return 0;
 248 }
 249
 250 LWS_VISIBLE void
 251 lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
 252 {
 253         if (info->gid != -1)
 254                 if (setgid(info->gid))
 255                         lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
 256         if (info->uid != -1)
 257                 if (setuid(info->uid))
 258                         lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
 259 }
 260
 261 LWS_VISIBLE int
 262 lws_plat_init_fd_tables(struct libwebsocket_context *context)
 263 {
 264         if (lws_libev_init_fd_table(context))
 265                 /* libev handled it instead */
 266                 return 0;
 267
 268         if (pipe(context->dummy_pipe_fds)) {
 269                 lwsl_err("Unable to create pipe\n");
 270                 return 1;
 271         }
 272
 273         /* use the read end of pipe as first item */
 274         context->fds[0].fd = context->dummy_pipe_fds[0];
 275         context->fds[0].events = LWS_POLLIN;
 276         context->fds[0].revents = 0;
 277         context->fds_count = 1;
 278
 279         context->fd_random = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 280         if (context->fd_random < 0) {
 281                 lwsl_err("Unable to open random device %s %d\n",
 282                                     SYSTEM_RANDOM_FILEPATH, context->fd_random);
 283                 return 1;
 284         }
 285
 286         return 0;
 287 }
 288
 289 static void sigpipe_handler(int x)
 290 {
 291 }
 292
 293
 294 LWS_VISIBLE int
 295 lws_plat_context_early_init(void)
 296 {
 297         sigset_t mask;
 298
 299         signal(SIGUSR2, lws_sigusr2);
 300         sigemptyset(&mask);
 301         sigaddset(&mask, SIGUSR2);
 302
 303         sigprocmask(SIG_BLOCK, &mask, NULL);
 304
 305         signal(SIGPIPE, sigpipe_handler);
 306
 307         return 0;
 308 }
 309
 310 LWS_VISIBLE void
 311 lws_plat_context_early_destroy(struct libwebsocket_context *context)
 312 {
 313 }
 314
 315 LWS_VISIBLE void
 316 lws_plat_context_late_destroy(struct libwebsocket_context *context)
 317 {
 318         close(context->dummy_pipe_fds[0]);
 319         close(context->dummy_pipe_fds[1]);
 320         close(context->fd_random);
 321 }
 322
 323 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 324
 325 LWS_VISIBLE int
 326 interface_to_sa(struct libwebsocket_context *context,
 327                 const char *ifname, struct sockaddr_in *addr, size_t addrlen)
 328 {
 329         int rc = -1;
 330
 331         struct ifaddrs *ifr;
 332         struct ifaddrs *ifc;
 333 #ifdef LWS_USE_IPV6
 334         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 335 #endif
 336
 337         getifaddrs(&ifr);
 338         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 339                 if (!ifc->ifa_addr)
 340                         continue;
 341
 342                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 343
 344                 if (strcmp(ifc->ifa_name, ifname))
 345                         continue;
 346
 347                 switch (ifc->ifa_addr->sa_family) {
 348                 case AF_INET:
 349 #ifdef LWS_USE_IPV6
 350                         if (LWS_IPV6_ENABLED(context)) {
 351                                 /* map IPv4 to IPv6 */
 352                                 bzero((char *)&addr6->sin6_addr,
 353                                                 sizeof(struct in6_addr));
 354                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 355                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 356                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 357                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 358                                                         sizeof(struct in_addr));
 359                         } else
 360 #endif
 361                                 memcpy(addr,
 362                                         (struct sockaddr_in *)ifc->ifa_addr,
 363                                                     sizeof(struct sockaddr_in));
 364                         break;
 365 #ifdef LWS_USE_IPV6
 366                 case AF_INET6:
 367                         memcpy(&addr6->sin6_addr,
 368                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 369                                                        sizeof(struct in6_addr));
 370                         break;
 371 #endif
 372                 default:
 373                         continue;
 374                 }
 375                 rc = 0;
 376         }
 377
 378         freeifaddrs(ifr);
 379
 380         if (rc == -1) {
 381                 /* check if bind to IP adddress */
 382 #ifdef LWS_USE_IPV6
 383                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 384                         rc = 0;
 385                 else
 386 #endif
 387                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 388                         rc = 0;
 389         }
 390
 391         return rc;
 392 }
 393
 394 LWS_VISIBLE void
 395 lws_plat_insert_socket_into_fds(struct libwebsocket_context *context,
 396                                                        struct libwebsocket *wsi)
 397 {
 398         lws_libev_io(context, wsi, LWS_EV_START | LWS_EV_READ);
 399         context->fds[context->fds_count++].revents = 0;
 400 }
 401
 402 LWS_VISIBLE void
 403 lws_plat_delete_socket_from_fds(struct libwebsocket_context *context,
 404                                                 struct libwebsocket *wsi, int m)
 405 {
 406 }
 407
 408 LWS_VISIBLE void
 409 lws_plat_service_periodic(struct libwebsocket_context *context)
 410 {
 411         /* if our parent went down, don't linger around */
 412         if (context->started_with_parent &&
 413                               kill(context->started_with_parent, 0) < 0)
 414                 kill(getpid(), SIGTERM);
 415 }
 416
 417 LWS_VISIBLE int
 418 lws_plat_change_pollfd(struct libwebsocket_context *context,
 419                       struct libwebsocket *wsi, struct libwebsocket_pollfd *pfd)
 420 {
 421         return 0;
 422 }
 423
 424 LWS_VISIBLE int
 425 lws_plat_open_file(const char* filename, unsigned long* filelen)
 426 {
 427         struct stat stat_buf;
 428         int ret = open(filename, O_RDONLY);
 429
 430         if (ret < 0)
 431                 return LWS_INVALID_FILE;
 432
 433         if (fstat(ret, &stat_buf) < 0) {
 434                 close(ret);
 435                 return LWS_INVALID_FILE;
 436         }
 437         *filelen = stat_buf.st_size;
 438         return ret;
 439 }
 440
 441 #ifdef LWS_USE_IPV6
 442 LWS_VISIBLE const char *
 443 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 444 {
 445         return inet_ntop(af, src, dst, cnt);
 446 }
 447 #endif