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         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
 238                 return 1;
 239
 240         return 0;
 241 }
 242
 243 LWS_VISIBLE void
 244 lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
 245 {
 246         if (info->gid != -1)
 247                 if (setgid(info->gid))
 248                         lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
 249         if (info->uid != -1)
 250                 if (setuid(info->uid))
 251                         lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
 252 }
 253
 254 LWS_VISIBLE int
 255 lws_plat_init_fd_tables(struct libwebsocket_context *context)
 256 {
 257         if (lws_libev_init_fd_table(context))
 258                 /* libev handled it instead */
 259                 return 0;
 260
 261         if (pipe(context->dummy_pipe_fds)) {
 262                 lwsl_err("Unable to create pipe\n");
 263                 return 1;
 264         }
 265
 266         /* use the read end of pipe as first item */
 267         context->fds[0].fd = context->dummy_pipe_fds[0];
 268         context->fds[0].events = LWS_POLLIN;
 269         context->fds[0].revents = 0;
 270         context->fds_count = 1;
 271
 272         context->fd_random = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 273         if (context->fd_random < 0) {
 274                 lwsl_err("Unable to open random device %s %d\n",
 275                                     SYSTEM_RANDOM_FILEPATH, context->fd_random);
 276                 return 1;
 277         }
 278
 279         return 0;
 280 }
 281
 282 static void sigpipe_handler(int x)
 283 {
 284 }
 285
 286
 287 LWS_VISIBLE int
 288 lws_plat_context_early_init(void)
 289 {
 290         sigset_t mask;
 291
 292         signal(SIGUSR2, lws_sigusr2);
 293         sigemptyset(&mask);
 294         sigaddset(&mask, SIGUSR2);
 295
 296         sigprocmask(SIG_BLOCK, &mask, NULL);
 297
 298         signal(SIGPIPE, sigpipe_handler);
 299
 300         return 0;
 301 }
 302
 303 LWS_VISIBLE void
 304 lws_plat_context_early_destroy(struct libwebsocket_context *context)
 305 {
 306 }
 307
 308 LWS_VISIBLE void
 309 lws_plat_context_late_destroy(struct libwebsocket_context *context)
 310 {
 311         close(context->dummy_pipe_fds[0]);
 312         close(context->dummy_pipe_fds[1]);
 313         close(context->fd_random);
 314 }
 315
 316 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 317
 318 LWS_VISIBLE int
 319 interface_to_sa(struct libwebsocket_context *context,
 320                 const char *ifname, struct sockaddr_in *addr, size_t addrlen)
 321 {
 322         int rc = -1;
 323
 324         struct ifaddrs *ifr;
 325         struct ifaddrs *ifc;
 326 #ifdef LWS_USE_IPV6
 327         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 328 #endif
 329
 330         getifaddrs(&ifr);
 331         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 332                 if (!ifc->ifa_addr)
 333                         continue;
 334
 335                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 336
 337                 if (strcmp(ifc->ifa_name, ifname))
 338                         continue;
 339
 340                 switch (ifc->ifa_addr->sa_family) {
 341                 case AF_INET:
 342 #ifdef LWS_USE_IPV6
 343                         if (LWS_IPV6_ENABLED(context)) {
 344                                 /* map IPv4 to IPv6 */
 345                                 bzero((char *)&addr6->sin6_addr,
 346                                                 sizeof(struct in6_addr));
 347                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 348                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 349                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 350                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 351                                                         sizeof(struct in_addr));
 352                         } else
 353 #endif
 354                                 memcpy(addr,
 355                                         (struct sockaddr_in *)ifc->ifa_addr,
 356                                                     sizeof(struct sockaddr_in));
 357                         break;
 358 #ifdef LWS_USE_IPV6
 359                 case AF_INET6:
 360                         memcpy(&addr6->sin6_addr,
 361                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 362                                                        sizeof(struct in6_addr));
 363                         break;
 364 #endif
 365                 default:
 366                         continue;
 367                 }
 368                 rc = 0;
 369         }
 370
 371         freeifaddrs(ifr);
 372
 373         if (rc == -1) {
 374                 /* check if bind to IP adddress */
 375 #ifdef LWS_USE_IPV6
 376                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 377                         rc = 0;
 378                 else
 379 #endif
 380                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 381                         rc = 0;
 382         }
 383
 384         return rc;
 385 }
 386
 387 LWS_VISIBLE void
 388 lws_plat_insert_socket_into_fds(struct libwebsocket_context *context,
 389                                                        struct libwebsocket *wsi)
 390 {
 391         lws_libev_io(context, wsi, LWS_EV_START | LWS_EV_READ);
 392         context->fds[context->fds_count++].revents = 0;
 393 }
 394
 395 LWS_VISIBLE void
 396 lws_plat_delete_socket_from_fds(struct libwebsocket_context *context,
 397                                                 struct libwebsocket *wsi, int m)
 398 {
 399 }
 400
 401 LWS_VISIBLE void
 402 lws_plat_service_periodic(struct libwebsocket_context *context)
 403 {
 404         /* if our parent went down, don't linger around */
 405         if (context->started_with_parent &&
 406                               kill(context->started_with_parent, 0) < 0)
 407                 kill(getpid(), SIGTERM);
 408 }
 409
 410 LWS_VISIBLE int
 411 lws_plat_change_pollfd(struct libwebsocket_context *context,
 412                       struct libwebsocket *wsi, struct libwebsocket_pollfd *pfd)
 413 {
 414         return 0;
 415 }
 416
 417 LWS_VISIBLE int
 418 lws_plat_open_file(const char* filename, unsigned long* filelen)
 419 {
 420         struct stat stat_buf;
 421         int ret = open(filename, O_RDONLY);
 422
 423         if (ret < 0)
 424                 return LWS_INVALID_FILE;
 425
 426         if (fstat(ret, &stat_buf) < 0) {
 427                 close(ret);
 428                 return LWS_INVALID_FILE;
 429         }
 430         *filelen = stat_buf.st_size;
 431         return ret;
 432 }
 433
 434 #ifdef LWS_USE_IPV6
 435 LWS_VISIBLE const char *
 436 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 437 {
 438         return inet_ntop(af, src, dst, cnt);
 439 }
 440 #endif