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         n = poll(context->fds, context->fds_count, timeout_ms);
 112         context->service_tid = 0;
 113
 114         if (n == 0) /* poll timeout */ {
 115                 libwebsocket_service_fd(context, NULL);
 116                 return 0;
 117         }
 118
 119         if (n < 0) {
 120                 if (LWS_ERRNO != LWS_EINTR)
 121                         return -1;
 122                 return 0;
 123         }
 124
 125         /* any socket with events to service? */
 126
 127         for (n = 0; n < context->fds_count; n++) {
 128 #ifdef LWS_OPENSSL_SUPPORT
 129                 struct libwebsocket *wsi;
 130
 131                 wsi = context->lws_lookup[context->fds[n].fd];
 132                 if (wsi == NULL)
 133                         continue;
 134                 /*
 135                  * if he's not flowcontrolled, make sure we service ssl
 136                  * pending read data
 137                  */
 138                 if (wsi->ssl && wsi->buffered_reads_pending) {
 139                         lwsl_debug("wsi %p: forcing POLLIN\n", wsi);
 140                         context->fds[n].revents |= context->fds[n].events & POLLIN;
 141                 }
 142 #endif
 143                 if (!context->fds[n].revents)
 144                         continue;
 145
 146                 if (context->fds[n].fd == context->dummy_pipe_fds[0]) {
 147                         if (read(context->fds[n].fd, &buf, 1) != 1)
 148                                 lwsl_err("Cannot read from dummy pipe.");
 149                         continue;
 150                 }
 151
 152                 m = libwebsocket_service_fd(context, &context->fds[n]);
 153                 if (m < 0)
 154                         return -1;
 155                 /* if something closed, retry this slot */
 156                 if (m)
 157                         n--;
 158         }
 159
 160         return 0;
 161 }
 162
 163 LWS_VISIBLE int
 164 lws_plat_set_socket_options(struct libwebsocket_context *context, int fd)
 165 {
 166         int optval = 1;
 167         socklen_t optlen = sizeof(optval);
 168
 169 #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || \
 170     defined(__OpenBSD__)
 171         struct protoent *tcp_proto;
 172 #endif
 173
 174         if (context->ka_time) {
 175                 /* enable keepalive on this socket */
 176                 optval = 1;
 177                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
 178                                              (const void *)&optval, optlen) < 0)
 179                         return 1;
 180
 181 #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || \
 182         defined(__CYGWIN__) || defined(__OpenBSD__)
 183
 184                 /*
 185                  * didn't find a way to set these per-socket, need to
 186                  * tune kernel systemwide values
 187                  */
 188 #else
 189                 /* set the keepalive conditions we want on it too */
 190                 optval = context->ka_time;
 191                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE,
 192                                              (const void *)&optval, optlen) < 0)
 193                         return 1;
 194
 195                 optval = context->ka_interval;
 196                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL,
 197                                              (const void *)&optval, optlen) < 0)
 198                         return 1;
 199
 200                 optval = context->ka_probes;
 201                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT,
 202                                              (const void *)&optval, optlen) < 0)
 203                         return 1;
 204 #endif
 205         }
 206
 207         /* Disable Nagle */
 208         optval = 1;
 209 #if !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__NetBSD__) && \
 210     !defined(__OpenBSD__)
 211         setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&optval, optlen);
 212 #else
 213         tcp_proto = getprotobyname("TCP");
 214         setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, &optval, optlen);
 215 #endif
 216
 217         /* We are nonblocking... */
 218         fcntl(fd, F_SETFL, O_NONBLOCK);
 219
 220         return 0;
 221 }
 222
 223 LWS_VISIBLE void
 224 lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
 225 {
 226         if (info->gid != -1)
 227                 if (setgid(info->gid))
 228                         lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
 229         if (info->uid != -1)
 230                 if (setuid(info->uid))
 231                         lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
 232 }
 233
 234 LWS_VISIBLE int
 235 lws_plat_init_fd_tables(struct libwebsocket_context *context)
 236 {
 237         if (lws_libev_init_fd_table(context))
 238                 /* libev handled it instead */
 239                 return 0;
 240
 241         if (pipe(context->dummy_pipe_fds)) {
 242                 lwsl_err("Unable to create pipe\n");
 243                 return 1;
 244         }
 245
 246         /* use the read end of pipe as first item */
 247         context->fds[0].fd = context->dummy_pipe_fds[0];
 248         context->fds[0].events = LWS_POLLIN;
 249         context->fds[0].revents = 0;
 250         context->fds_count = 1;
 251
 252         context->fd_random = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 253         if (context->fd_random < 0) {
 254                 lwsl_err("Unable to open random device %s %d\n",
 255                                     SYSTEM_RANDOM_FILEPATH, context->fd_random);
 256                 return 1;
 257         }
 258
 259         return 0;
 260 }
 261
 262 static void sigpipe_handler(int x)
 263 {
 264 }
 265
 266
 267 LWS_VISIBLE int
 268 lws_plat_context_early_init(void)
 269 {
 270         sigset_t mask;
 271
 272         signal(SIGUSR2, lws_sigusr2);
 273         sigemptyset(&mask);
 274         sigaddset(&mask, SIGUSR2);
 275
 276         sigprocmask(SIG_BLOCK, &mask, NULL);
 277
 278         signal(SIGPIPE, sigpipe_handler);
 279
 280         return 0;
 281 }
 282
 283 LWS_VISIBLE void
 284 lws_plat_context_early_destroy(struct libwebsocket_context *context)
 285 {
 286 }
 287
 288 LWS_VISIBLE void
 289 lws_plat_context_late_destroy(struct libwebsocket_context *context)
 290 {
 291         close(context->dummy_pipe_fds[0]);
 292         close(context->dummy_pipe_fds[1]);
 293         close(context->fd_random);
 294 }
 295
 296 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 297
 298 LWS_VISIBLE int
 299 interface_to_sa(struct libwebsocket_context *context,
 300                 const char *ifname, struct sockaddr_in *addr, size_t addrlen)
 301 {
 302         int rc = -1;
 303
 304         struct ifaddrs *ifr;
 305         struct ifaddrs *ifc;
 306 #ifdef LWS_USE_IPV6
 307         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 308 #endif
 309
 310         getifaddrs(&ifr);
 311         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 312                 if (!ifc->ifa_addr)
 313                         continue;
 314
 315                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 316
 317                 if (strcmp(ifc->ifa_name, ifname))
 318                         continue;
 319
 320                 switch (ifc->ifa_addr->sa_family) {
 321                 case AF_INET:
 322 #ifdef LWS_USE_IPV6
 323                         if (LWS_IPV6_ENABLED(context)) {
 324                                 /* map IPv4 to IPv6 */
 325                                 bzero((char *)&addr6->sin6_addr,
 326                                                 sizeof(struct in6_addr));
 327                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 328                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 329                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 330                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 331                                                         sizeof(struct in_addr));
 332                         } else
 333 #endif
 334                                 memcpy(addr,
 335                                         (struct sockaddr_in *)ifc->ifa_addr,
 336                                                     sizeof(struct sockaddr_in));
 337                         break;
 338 #ifdef LWS_USE_IPV6
 339                 case AF_INET6:
 340                         if (rc >= 0)
 341                                 break;
 342                         memcpy(&addr6->sin6_addr,
 343                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 344                                                        sizeof(struct in6_addr));
 345                         break;
 346 #endif
 347                 default:
 348                         continue;
 349                 }
 350                 rc = 0;
 351         }
 352
 353         freeifaddrs(ifr);
 354
 355         if (rc == -1) {
 356                 /* check if bind to IP adddress */
 357 #ifdef LWS_USE_IPV6
 358                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 359                         rc = 0;
 360                 else
 361 #endif
 362                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 363                         rc = 0;
 364         }
 365
 366         return rc;
 367 }
 368
 369 LWS_VISIBLE void
 370 lws_plat_insert_socket_into_fds(struct libwebsocket_context *context,
 371                                                        struct libwebsocket *wsi)
 372 {
 373         lws_libev_io(context, wsi, LWS_EV_START | LWS_EV_READ);
 374         context->fds[context->fds_count++].revents = 0;
 375 }
 376
 377 LWS_VISIBLE void
 378 lws_plat_delete_socket_from_fds(struct libwebsocket_context *context,
 379                                                 struct libwebsocket *wsi, int m)
 380 {
 381 }
 382
 383 LWS_VISIBLE void
 384 lws_plat_service_periodic(struct libwebsocket_context *context)
 385 {
 386         /* if our parent went down, don't linger around */
 387         if (context->started_with_parent &&
 388                               kill(context->started_with_parent, 0) < 0)
 389                 kill(getpid(), SIGTERM);
 390 }
 391
 392 LWS_VISIBLE int
 393 lws_plat_change_pollfd(struct libwebsocket_context *context,
 394                       struct libwebsocket *wsi, struct libwebsocket_pollfd *pfd)
 395 {
 396         return 0;
 397 }
 398
 399 LWS_VISIBLE int
 400 lws_plat_open_file(const char* filename, unsigned long* filelen)
 401 {
 402         struct stat stat_buf;
 403         int ret = open(filename, O_RDONLY);
 404
 405         if (ret < 0)
 406                 return LWS_INVALID_FILE;
 407
 408         fstat(ret, &stat_buf);
 409         *filelen = stat_buf.st_size;
 410         return ret;
 411 }
 412
 413 #ifdef LWS_USE_IPV6
 414 LWS_VISIBLE const char *
 415 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 416 {
 417         return inet_ntop(af, src, dst, cnt);
 418 }
 419 #endif