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 (tv.tv_sec * 1000000) + 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
 101         /* stay dead once we are dead */
 102
 103         if (!context)
 104                 return 1;
 105
 106         lws_libev_run(context);
 107
 108         context->service_tid = context->protocols[0].callback(context, NULL,
 109                                      LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
 110
 111 #ifdef LWS_OPENSSL_SUPPORT
 112         /* if we know we have non-network pending data, do not wait in poll */
 113         if (context->ssl_flag_buffered_reads)
 114                 timeout_ms = 0;
 115 #endif
 116         n = poll(context->fds, context->fds_count, timeout_ms);
 117         context->service_tid = 0;
 118
 119 #ifdef LWS_OPENSSL_SUPPORT
 120         if (!context->ssl_flag_buffered_reads && n == 0) {
 121 #else
 122         if (n == 0) /* poll timeout */ {
 123 #endif
 124                 libwebsocket_service_fd(context, NULL);
 125                 return 0;
 126         }
 127
 128 #ifdef LWS_OPENSSL_SUPPORT
 129         /* any more will have to set it fresh this time around */
 130         context->ssl_flag_buffered_reads = 0;
 131 #endif
 132
 133         if (n < 0) {
 134                 if (LWS_ERRNO != LWS_EINTR)
 135                         return -1;
 136                 return 0;
 137         }
 138
 139         /* any socket with events to service? */
 140
 141         for (n = 0; n < context->fds_count; n++) {
 142 #ifdef LWS_OPENSSL_SUPPORT
 143                 struct libwebsocket *wsi;
 144
 145                 wsi = context->lws_lookup[context->fds[n].fd];
 146                 if (wsi == NULL)
 147                         continue;
 148                 /*
 149                  * if he's not flowcontrolled, make sure we service ssl
 150                  * pending read data
 151                  */
 152                 if (wsi->ssl && wsi->buffered_reads_pending) {
 153                         lwsl_debug("wsi %p: forcing POLLIN\n", wsi);
 154                         context->fds[n].revents |= context->fds[n].events & POLLIN;
 155                         if (context->fds[n].revents & POLLIN)
 156                                 wsi->buffered_reads_pending = 0;
 157                         else
 158                                 /* somebody left with pending SSL read data */
 159                                 context->ssl_flag_buffered_reads = 1;
 160                 }
 161 #endif
 162                 if (!context->fds[n].revents)
 163                         continue;
 164
 165                 if (context->fds[n].fd == context->dummy_pipe_fds[0]) {
 166                         if (read(context->fds[n].fd, &buf, 1) != 1)
 167                                 lwsl_err("Cannot read from dummy pipe.");
 168                         continue;
 169                 }
 170
 171                 m = libwebsocket_service_fd(context, &context->fds[n]);
 172                 if (m < 0)
 173                         return -1;
 174                 /* if something closed, retry this slot */
 175                 if (m)
 176                         n--;
 177         }
 178
 179         return 0;
 180 }
 181
 182 LWS_VISIBLE int
 183 lws_plat_set_socket_options(struct libwebsocket_context *context, int fd)
 184 {
 185         int optval = 1;
 186         socklen_t optlen = sizeof(optval);
 187
 188 #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || \
 189     defined(__OpenBSD__)
 190         struct protoent *tcp_proto;
 191 #endif
 192
 193         if (context->ka_time) {
 194                 /* enable keepalive on this socket */
 195                 optval = 1;
 196                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
 197                                              (const void *)&optval, optlen) < 0)
 198                         return 1;
 199
 200 #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || \
 201         defined(__CYGWIN__) || defined(__OpenBSD__)
 202
 203                 /*
 204                  * didn't find a way to set these per-socket, need to
 205                  * tune kernel systemwide values
 206                  */
 207 #else
 208                 /* set the keepalive conditions we want on it too */
 209                 optval = context->ka_time;
 210                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE,
 211                                              (const void *)&optval, optlen) < 0)
 212                         return 1;
 213
 214                 optval = context->ka_interval;
 215                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL,
 216                                              (const void *)&optval, optlen) < 0)
 217                         return 1;
 218
 219                 optval = context->ka_probes;
 220                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT,
 221                                              (const void *)&optval, optlen) < 0)
 222                         return 1;
 223 #endif
 224         }
 225
 226         /* Disable Nagle */
 227         optval = 1;
 228 #if !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__NetBSD__) && \
 229     !defined(__OpenBSD__)
 230         setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&optval, optlen);
 231 #else
 232         tcp_proto = getprotobyname("TCP");
 233         setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, &optval, optlen);
 234 #endif
 235
 236         /* We are nonblocking... */
 237         fcntl(fd, F_SETFL, O_NONBLOCK);
 238
 239         return 0;
 240 }
 241
 242 LWS_VISIBLE void
 243 lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
 244 {
 245         if (info->gid != -1)
 246                 if (setgid(info->gid))
 247                         lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
 248         if (info->uid != -1)
 249                 if (setuid(info->uid))
 250                         lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
 251 }
 252
 253 LWS_VISIBLE int
 254 lws_plat_init_fd_tables(struct libwebsocket_context *context)
 255 {
 256         if (lws_libev_init_fd_table(context))
 257                 /* libev handled it instead */
 258                 return 0;
 259
 260         if (pipe(context->dummy_pipe_fds)) {
 261                 lwsl_err("Unable to create pipe\n");
 262                 return 1;
 263         }
 264
 265         /* use the read end of pipe as first item */
 266         context->fds[0].fd = context->dummy_pipe_fds[0];
 267         context->fds[0].events = LWS_POLLIN;
 268         context->fds[0].revents = 0;
 269         context->fds_count = 1;
 270
 271         context->fd_random = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 272         if (context->fd_random < 0) {
 273                 lwsl_err("Unable to open random device %s %d\n",
 274                                     SYSTEM_RANDOM_FILEPATH, context->fd_random);
 275                 return 1;
 276         }
 277
 278         return 0;
 279 }
 280
 281 static void sigpipe_handler(int x)
 282 {
 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 libwebsocket_context *context)
 304 {
 305 }
 306
 307 LWS_VISIBLE void
 308 lws_plat_context_late_destroy(struct libwebsocket_context *context)
 309 {
 310         close(context->dummy_pipe_fds[0]);
 311         close(context->dummy_pipe_fds[1]);
 312         close(context->fd_random);
 313 }
 314
 315 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 316
 317 LWS_VISIBLE int
 318 interface_to_sa(struct libwebsocket_context *context,
 319                 const char *ifname, struct sockaddr_in *addr, size_t addrlen)
 320 {
 321         int rc = -1;
 322
 323         struct ifaddrs *ifr;
 324         struct ifaddrs *ifc;
 325 #ifdef LWS_USE_IPV6
 326         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 327 #endif
 328
 329         getifaddrs(&ifr);
 330         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 331                 if (!ifc->ifa_addr)
 332                         continue;
 333
 334                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 335
 336                 if (strcmp(ifc->ifa_name, ifname))
 337                         continue;
 338
 339                 switch (ifc->ifa_addr->sa_family) {
 340                 case AF_INET:
 341 #ifdef LWS_USE_IPV6
 342                         if (LWS_IPV6_ENABLED(context)) {
 343                                 /* map IPv4 to IPv6 */
 344                                 bzero((char *)&addr6->sin6_addr,
 345                                                 sizeof(struct in6_addr));
 346                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 347                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 348                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 349                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 350                                                         sizeof(struct in_addr));
 351                         } else
 352 #endif
 353                                 memcpy(addr,
 354                                         (struct sockaddr_in *)ifc->ifa_addr,
 355                                                     sizeof(struct sockaddr_in));
 356                         break;
 357 #ifdef LWS_USE_IPV6
 358                 case AF_INET6:
 359                         if (rc >= 0)
 360                                 break;
 361                         memcpy(&addr6->sin6_addr,
 362                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 363                                                        sizeof(struct in6_addr));
 364                         break;
 365 #endif
 366                 default:
 367                         continue;
 368                 }
 369                 rc = 0;
 370         }
 371
 372         freeifaddrs(ifr);
 373
 374         if (rc == -1) {
 375                 /* check if bind to IP adddress */
 376 #ifdef LWS_USE_IPV6
 377                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 378                         rc = 0;
 379                 else
 380 #endif
 381                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 382                         rc = 0;
 383         }
 384
 385         return rc;
 386 }
 387
 388 LWS_VISIBLE void
 389 lws_plat_insert_socket_into_fds(struct libwebsocket_context *context,
 390                                                        struct libwebsocket *wsi)
 391 {
 392         lws_libev_io(context, wsi, LWS_EV_START | LWS_EV_READ);
 393         context->fds[context->fds_count++].revents = 0;
 394 }
 395
 396 LWS_VISIBLE void
 397 lws_plat_delete_socket_from_fds(struct libwebsocket_context *context,
 398                                                 struct libwebsocket *wsi, int m)
 399 {
 400 }
 401
 402 LWS_VISIBLE void
 403 lws_plat_service_periodic(struct libwebsocket_context *context)
 404 {
 405         /* if our parent went down, don't linger around */
 406         if (context->started_with_parent &&
 407                               kill(context->started_with_parent, 0) < 0)
 408                 kill(getpid(), SIGTERM);
 409 }
 410
 411 LWS_VISIBLE int
 412 lws_plat_change_pollfd(struct libwebsocket_context *context,
 413                       struct libwebsocket *wsi, struct libwebsocket_pollfd *pfd)
 414 {
 415         return 0;
 416 }
 417
 418 LWS_VISIBLE int
 419 lws_plat_open_file(const char* filename, unsigned long* filelen)
 420 {
 421         struct stat stat_buf;
 422         int ret = open(filename, O_RDONLY);
 423
 424         if (ret < 0)
 425                 return LWS_INVALID_FILE;
 426
 427         fstat(ret, &stat_buf);
 428         *filelen = stat_buf.st_size;
 429         return ret;
 430 }
 431
 432 #ifdef LWS_USE_IPV6
 433 LWS_VISIBLE const char *
 434 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 435 {
 436         return inet_ntop(af, src, dst, cnt);
 437 }
 438 #endif