lib/libwebsockets.c

   1 /*
   2  * libwebsockets - small server side websockets and web server implementation
   3  *
   4  * Copyright (C) 2010 Andy Green <andy@warmcat.com>
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Lesser General Public
   8  *  License as published by the Free Software Foundation:
   9  *  version 2.1 of the License.
  10  *
  11  *  This library is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Lesser General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Lesser General Public
  17  *  License along with this library; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19  *  MA  02110-1301  USA
  20  */
  21
  22 #include "private-libwebsockets.h"
  23
  24 #ifdef WIN32
  25
  26 #else
  27 #include <ifaddrs.h>
  28 #include <sys/un.h>
  29 #endif
  30
  31 #ifdef LWS_OPENSSL_SUPPORT
  32 int openssl_websocket_private_data_index;
  33 #endif
  34
  35 /*
  36  * In-place str to lower case
  37  */
  38
  39 static void
  40 strtolower(char *s)
  41 {
  42         while (*s) {
  43                 *s = tolower(*s);
  44                 s++;
  45         }
  46 }
  47
  48 /* file descriptor hash management */
  49
  50 struct libwebsocket *
  51 wsi_from_fd(struct libwebsocket_context *context, int fd)
  52 {
  53         int h = LWS_FD_HASH(fd);
  54         int n = 0;
  55
  56         for (n = 0; n < context->fd_hashtable[h].length; n++)
  57                 if (context->fd_hashtable[h].wsi[n]->sock == fd)
  58                         return context->fd_hashtable[h].wsi[n];
  59
  60         return NULL;
  61 }
  62
  63 int
  64 insert_wsi(struct libwebsocket_context *context, struct libwebsocket *wsi)
  65 {
  66         int h = LWS_FD_HASH(wsi->sock);
  67
  68         if (context->fd_hashtable[h].length == MAX_CLIENTS - 1) {
  69                 fprintf(stderr, "hash table overflow\n");
  70                 return 1;
  71         }
  72
  73         context->fd_hashtable[h].wsi[context->fd_hashtable[h].length++] = wsi;
  74
  75         return 0;
  76 }
  77
  78 int
  79 delete_from_fd(struct libwebsocket_context *context, int fd)
  80 {
  81         int h = LWS_FD_HASH(fd);
  82         int n = 0;
  83
  84         for (n = 0; n < context->fd_hashtable[h].length; n++)
  85                 if (context->fd_hashtable[h].wsi[n]->sock == fd) {
  86                         while (n < context->fd_hashtable[h].length) {
  87                                 context->fd_hashtable[h].wsi[n] =
  88                                             context->fd_hashtable[h].wsi[n + 1];
  89                                 n++;
  90                         }
  91                         context->fd_hashtable[h].length--;
  92
  93                         return 0;
  94                 }
  95
  96         fprintf(stderr, "Failed to find fd %d requested for "
  97                                                    "delete in hashtable\n", fd);
  98         return 1;
  99 }
 100
 101 #ifdef LWS_OPENSSL_SUPPORT
 102 static void
 103 libwebsockets_decode_ssl_error(void)
 104 {
 105         char buf[256];
 106         u_long err;
 107
 108         while ((err = ERR_get_error()) != 0) {
 109                 ERR_error_string_n(err, buf, sizeof(buf));
 110                 fprintf(stderr, "*** %s\n", buf);
 111         }
 112 }
 113 #endif
 114
 115
 116 static int
 117 interface_to_sa(const char* ifname, struct sockaddr_in *addr, size_t addrlen)
 118 {
 119         int rc = -1;
 120 #ifdef WIN32
 121         // TODO
 122 #else
 123         struct ifaddrs *ifr;
 124         struct ifaddrs *ifc;
 125         struct sockaddr_in *sin;
 126
 127         getifaddrs(&ifr);
 128         for (ifc = ifr; ifc != NULL; ifc = ifc->ifa_next) {
 129                 if (strcmp(ifc->ifa_name, ifname))
 130                         continue;
 131                 if (ifc->ifa_addr == NULL)
 132                         continue;
 133                 sin = (struct sockaddr_in *)ifc->ifa_addr;
 134                 if (sin->sin_family != AF_INET)
 135                         continue;
 136                 memcpy(addr, sin, addrlen);
 137                 rc = 0;
 138         }
 139
 140         freeifaddrs(ifr);
 141 #endif
 142         return rc;
 143 }
 144
 145 void
 146 libwebsocket_close_and_free_session(struct libwebsocket_context *context,
 147                          struct libwebsocket *wsi, enum lws_close_status reason)
 148 {
 149         int n;
 150         int old_state;
 151         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 2 +
 152                                                   LWS_SEND_BUFFER_POST_PADDING];
 153         int ret;
 154         int m;
 155         struct lws_tokens eff_buf;
 156
 157         if (!wsi)
 158                 return;
 159
 160         old_state = wsi->state;
 161
 162         if (old_state == WSI_STATE_DEAD_SOCKET)
 163                 return;
 164
 165         wsi->close_reason = reason;
 166
 167         /*
 168          * flush any tx pending from extensions, since we may send close packet
 169          * if there are problems with send, just nuke the connection
 170          */
 171
 172         ret = 1;
 173         while (ret == 1) {
 174
 175                 /* default to nobody has more to spill */
 176
 177                 ret = 0;
 178                 eff_buf.token = NULL;
 179                 eff_buf.token_len = 0;
 180
 181                 /* show every extension the new incoming data */
 182
 183                 for (n = 0; n < wsi->count_active_extensions; n++) {
 184                         m = wsi->active_extensions[n]->callback(
 185                                         wsi->protocol->owning_server,
 186                                         wsi->active_extensions[n], wsi,
 187                                         LWS_EXT_CALLBACK_FLUSH_PENDING_TX,
 188                                    wsi->active_extensions_user[n], &eff_buf, 0);
 189                         if (m < 0) {
 190                                 fprintf(stderr, "Extension reports "
 191                                                                "fatal error\n");
 192                                 goto just_kill_connection;
 193                         }
 194                         if (m)
 195                                 /*
 196                                  * at least one extension told us he has more
 197                                  * to spill, so we will go around again after
 198                                  */
 199                                 ret = 1;
 200                 }
 201
 202                 /* assuming they left us something to send, send it */
 203
 204                 if (eff_buf.token_len)
 205                         if (lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
 206                                                              eff_buf.token_len))
 207                                 goto just_kill_connection;
 208         }
 209
 210         /*
 211          * signal we are closing, libsocket_write will
 212          * add any necessary version-specific stuff.  If the write fails,
 213          * no worries we are closing anyway.  If we didn't initiate this
 214          * close, then our state has been changed to
 215          * WSI_STATE_RETURNED_CLOSE_ALREADY and we will skip this.
 216          *
 217          * Likewise if it's a second call to close this connection after we
 218          * sent the close indication to the peer already, we are in state
 219          * WSI_STATE_AWAITING_CLOSE_ACK and will skip doing this a second time.
 220          */
 221
 222         if (old_state == WSI_STATE_ESTABLISHED &&
 223                                           reason != LWS_CLOSE_STATUS_NOSTATUS) {
 224                 n = libwebsocket_write(wsi, &buf[LWS_SEND_BUFFER_PRE_PADDING],
 225                                                             0, LWS_WRITE_CLOSE);
 226                 if (!n) {
 227                         /*
 228                          * we have sent a nice protocol level indication we
 229                          * now wish to close, we should not send anything more
 230                          */
 231
 232                         wsi->state = WSI_STATE_AWAITING_CLOSE_ACK;
 233
 234                         /* and we should wait for a reply for a bit */
 235
 236                         libwebsocket_set_timeout(wsi,
 237                                                   PENDING_TIMEOUT_CLOSE_ACK, 5);
 238
 239                         fprintf(stderr, "sent close indication, awaiting ack\n");
 240
 241                         return;
 242                 }
 243
 244                 /* else, the send failed and we should just hang up */
 245         }
 246
 247 just_kill_connection:
 248         /*
 249          * we won't be servicing or receiving anything further from this guy
 250          * remove this fd from wsi mapping hashtable
 251          */
 252
 253         delete_from_fd(context, wsi->sock);
 254
 255         /* delete it from the internal poll list if still present */
 256
 257         for (n = 0; n < context->fds_count; n++) {
 258                 if (context->fds[n].fd != wsi->sock)
 259                         continue;
 260                 while (n < context->fds_count - 1) {
 261                         context->fds[n] = context->fds[n + 1];
 262                         n++;
 263                 }
 264                 context->fds_count--;
 265                 /* we only have to deal with one */
 266                 n = context->fds_count;
 267         }
 268
 269         /* remove also from external POLL support via protocol 0 */
 270
 271         context->protocols[0].callback(context, wsi,
 272                     LWS_CALLBACK_DEL_POLL_FD, (void *)(long)wsi->sock, NULL, 0);
 273
 274         wsi->state = WSI_STATE_DEAD_SOCKET;
 275
 276         /* tell the user it's all over for this guy */
 277
 278         if (wsi->protocol && wsi->protocol->callback &&
 279                                              old_state == WSI_STATE_ESTABLISHED)
 280                 wsi->protocol->callback(context, wsi, LWS_CALLBACK_CLOSED,
 281                                                       wsi->user_space, NULL, 0);
 282
 283         /* deallocate any active extension contexts */
 284
 285         for (n = 0; n < wsi->count_active_extensions; n++) {
 286                 if (!wsi->active_extensions[n]->callback)
 287                         continue;
 288
 289                 wsi->active_extensions[n]->callback(context,
 290                         wsi->active_extensions[n], wsi,
 291                                 LWS_EXT_CALLBACK_DESTROY,
 292                                        wsi->active_extensions_user[n], NULL, 0);
 293
 294                 free(wsi->active_extensions_user[n]);
 295         }
 296
 297         /* free up his parsing allocations */
 298
 299         for (n = 0; n < WSI_TOKEN_COUNT; n++)
 300                 if (wsi->utf8_token[n].token)
 301                         free(wsi->utf8_token[n].token);
 302
 303 /*      fprintf(stderr, "closing fd=%d\n", wsi->sock); */
 304
 305 #ifdef LWS_OPENSSL_SUPPORT
 306         if (wsi->ssl) {
 307                 n = SSL_get_fd(wsi->ssl);
 308                 SSL_shutdown(wsi->ssl);
 309 #ifdef WIN32
 310                 closesocket(n);
 311 #else
 312                 close(n);
 313 #endif
 314                 SSL_free(wsi->ssl);
 315         } else {
 316 #endif
 317                 shutdown(wsi->sock, SHUT_RDWR);
 318 #ifdef WIN32
 319                 closesocket(wsi->sock);
 320 #else
 321                 close(wsi->sock);
 322 #endif
 323 #ifdef LWS_OPENSSL_SUPPORT
 324         }
 325 #endif
 326         if (wsi->user_space)
 327                 free(wsi->user_space);
 328
 329         free(wsi);
 330 }
 331
 332 /**
 333  * libwebsockets_hangup_on_client() - Server calls to terminate client
 334  *                                      connection
 335  * @context:    libwebsockets context
 336  * @fd:         Connection socket descriptor
 337  */
 338
 339 void
 340 libwebsockets_hangup_on_client(struct libwebsocket_context *context, int fd)
 341 {
 342         struct libwebsocket *wsi = wsi_from_fd(context, fd);
 343
 344         if (wsi == NULL)
 345                 return;
 346
 347         libwebsocket_close_and_free_session(context, wsi,
 348                                                      LWS_CLOSE_STATUS_NOSTATUS);
 349 }
 350
 351
 352 /**
 353  * libwebsockets_get_peer_addresses() - Get client address information
 354  * @fd:         Connection socket descriptor
 355  * @name:       Buffer to take client address name
 356  * @name_len:   Length of client address name buffer
 357  * @rip:        Buffer to take client address IP qotted quad
 358  * @rip_len:    Length of client address IP buffer
 359  *
 360  *      This function fills in @name and @rip with the name and IP of
 361  *      the client connected with socket descriptor @fd.  Names may be
 362  *      truncated if there is not enough room.  If either cannot be
 363  *      determined, they will be returned as valid zero-length strings.
 364  */
 365
 366 void
 367 libwebsockets_get_peer_addresses(int fd, char *name, int name_len,
 368                                         char *rip, int rip_len)
 369 {
 370         unsigned int len;
 371         struct sockaddr_in sin;
 372         struct hostent *host;
 373         struct hostent *host1;
 374         char ip[128];
 375         unsigned char *p;
 376         int n;
 377         struct sockaddr_un *un;
 378
 379         rip[0] = '\0';
 380         name[0] = '\0';
 381
 382         len = sizeof sin;
 383         if (getpeername(fd, (struct sockaddr *) &sin, &len) < 0) {
 384                 perror("getpeername");
 385                 return;
 386         }
 387
 388         host = gethostbyaddr((char *) &sin.sin_addr, sizeof sin.sin_addr,
 389                                                                        AF_INET);
 390         if (host == NULL) {
 391                 perror("gethostbyaddr");
 392                 return;
 393         }
 394
 395         strncpy(name, host->h_name, name_len);
 396         name[name_len - 1] = '\0';
 397
 398         host1 = gethostbyname(host->h_name);
 399         if (host1 == NULL)
 400                 return;
 401         p = (unsigned char *)host1;
 402         n = 0;
 403         while (p != NULL) {
 404                 p = (unsigned char *)host1->h_addr_list[n++];
 405                 if (p == NULL)
 406                         continue;
 407                 if ((host1->h_addrtype != AF_INET)
 408 #ifdef AF_LOCAL
 409                         && (host1->h_addrtype != AF_LOCAL)
 410 #endif
 411                         )
 412                         continue;
 413
 414                 if (host1->h_addrtype == AF_INET)
 415                         sprintf(ip, "%u.%u.%u.%u", p[0], p[1], p[2], p[3]);
 416 #ifdef AF_LOCAL
 417                 else {
 418                         un = (struct sockaddr_un *)p;
 419                         strncpy(ip, un->sun_path, sizeof(ip) -1);
 420                         ip[sizeof(ip) - 1] = '\0';
 421                 }
 422 #endif
 423                 p = NULL;
 424                 strncpy(rip, ip, rip_len);
 425                 rip[rip_len - 1] = '\0';
 426         }
 427 }
 428
 429 int libwebsockets_get_random(struct libwebsocket_context *context,
 430                                                              void *buf, int len)
 431 {
 432         int n;
 433         char *p = buf;
 434
 435 #ifdef WIN32
 436         for (n = 0; n < len; n++)
 437                 p[n] = (unsigned char)rand();
 438 #else
 439         n = read(context->fd_random, p, len);
 440 #endif
 441
 442         return n;
 443 }
 444
 445 unsigned char *
 446 libwebsockets_SHA1(const unsigned char *d, size_t n, unsigned char *md)
 447 {
 448         return SHA1(d, n, md);
 449 }
 450
 451 void libwebsockets_00_spaceout(char *key, int spaces, int seed)
 452 {
 453         char *p;
 454
 455         key++;
 456         while (spaces--) {
 457                 if (*key && (seed & 1))
 458                         key++;
 459                 seed >>= 1;
 460
 461                 p = key + strlen(key);
 462                 while (p >= key) {
 463                         p[1] = p[0];
 464                         p--;
 465                 }
 466                 *key++ = ' ';
 467         }
 468 }
 469
 470 void libwebsockets_00_spam(char *key, int count, int seed)
 471 {
 472         char *p;
 473
 474         key++;
 475         while (count--) {
 476
 477                 if (*key && (seed & 1))
 478                         key++;
 479                 seed >>= 1;
 480
 481                 p = key + strlen(key);
 482                 while (p >= key) {
 483                         p[1] = p[0];
 484                         p--;
 485                 }
 486                 *key++ = 0x21 + ((seed & 0xffff) % 15);
 487                 /* 4 would use it up too fast.. not like it matters */
 488                 seed >>= 1;
 489         }
 490 }
 491
 492 int lws_send_pipe_choked(struct libwebsocket *wsi)
 493 {
 494         struct pollfd fds;
 495
 496         fds.fd = wsi->sock;
 497         fds.events = POLLOUT;
 498         fds.revents = 0;
 499
 500         if (poll(&fds, 1, 0) != 1)
 501                 return 1;
 502
 503         if ((fds.revents & POLLOUT) == 0)
 504                 return 1;
 505
 506         /* okay to send another packet without blocking */
 507
 508         return 0;
 509 }
 510
 511 static int
 512 lws_handle_POLLOUT_event(struct libwebsocket_context *context,
 513                                 struct libwebsocket *wsi, struct pollfd *pollfd)
 514 {
 515         struct lws_tokens eff_buf;
 516         int n;
 517         int ret;
 518         int m;
 519
 520         if (!wsi->extension_data_pending)
 521                 goto user_service;
 522
 523         /*
 524          * check in on the active extensions, see if they
 525          * had pending stuff to spill... they need to get the
 526          * first look-in otherwise sequence will be disordered
 527          *
 528          * NULL, zero-length eff_buf means just spill pending
 529          */
 530
 531         ret = 1;
 532         while (ret == 1) {
 533
 534                 /* default to nobody has more to spill */
 535
 536                 ret = 0;
 537                 eff_buf.token = NULL;
 538                 eff_buf.token_len = 0;
 539
 540                 /* give every extension a chance to spill */
 541
 542                 for (n = 0; n < wsi->count_active_extensions; n++) {
 543                         m = wsi->active_extensions[n]->callback(
 544                                 wsi->protocol->owning_server,
 545                                 wsi->active_extensions[n], wsi,
 546                                         LWS_EXT_CALLBACK_PACKET_TX_PRESEND,
 547                                    wsi->active_extensions_user[n], &eff_buf, 0);
 548                         if (m < 0) {
 549                                 fprintf(stderr, "extension reports fatal error\n");
 550                                 return -1;
 551                         }
 552                         if (m)
 553                                 /*
 554                                  * at least one extension told us he has more
 555                                  * to spill, so we will go around again after
 556                                  */
 557                                 ret = 1;
 558                 }
 559
 560                 /* assuming they gave us something to send, send it */
 561
 562                 if (eff_buf.token_len) {
 563                         if (lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
 564                                                              eff_buf.token_len))
 565                                 return -1;
 566                 } else
 567                         continue;
 568
 569                 /* no extension has more to spill */
 570
 571                 if (!ret)
 572                         continue;
 573
 574                 /*
 575                  * There's more to spill from an extension, but we just sent
 576                  * something... did that leave the pipe choked?
 577                  */
 578
 579                 if (!lws_send_pipe_choked(wsi))
 580                         /* no we could add more */
 581                         continue;
 582
 583                 fprintf(stderr, "choked in POLLOUT service\n");
 584
 585                 /*
 586                  * Yes, he's choked.  Leave the POLLOUT masked on so we will
 587                  * come back here when he is unchoked.  Don't call the user
 588                  * callback to enforce ordering of spilling, he'll get called
 589                  * when we come back here and there's nothing more to spill.
 590                  */
 591
 592                 return 0;
 593         }
 594
 595         wsi->extension_data_pending = 0;
 596
 597 user_service:
 598         /* one shot */
 599
 600         pollfd->events &= ~POLLOUT;
 601
 602         /* external POLL support via protocol 0 */
 603         context->protocols[0].callback(context, wsi,
 604                 LWS_CALLBACK_CLEAR_MODE_POLL_FD,
 605                 (void *)(long)wsi->sock, NULL, POLLOUT);
 606
 607         if (wsi->mode == LWS_CONNMODE_WS_CLIENT)
 608                 n = LWS_CALLBACK_CLIENT_WRITEABLE;
 609         else
 610                 n = LWS_CALLBACK_SERVER_WRITEABLE;
 611
 612         wsi->protocol->callback(context, wsi, n, wsi->user_space, NULL, 0);
 613
 614         return 0;
 615 }
 616
 617
 618
 619 /**
 620  * libwebsocket_service_fd() - Service polled socket with something waiting
 621  * @context:    Websocket context
 622  * @pollfd:     The pollfd entry describing the socket fd and which events
 623  *              happened.
 624  *
 625  *      This function closes any active connections and then frees the
 626  *      context.  After calling this, any further use of the context is
 627  *      undefined.
 628  */
 629
 630 int
 631 libwebsocket_service_fd(struct libwebsocket_context *context,
 632                                                           struct pollfd *pollfd)
 633 {
 634         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 1 + MAX_BROADCAST_PAYLOAD +
 635                                                   LWS_SEND_BUFFER_POST_PADDING];
 636         struct libwebsocket *wsi;
 637         struct libwebsocket *new_wsi;
 638         int n;
 639         int m;
 640         size_t len;
 641         int accept_fd;
 642         unsigned int clilen;
 643         struct sockaddr_in cli_addr;
 644         struct timeval tv;
 645         static const char magic_websocket_guid[] =
 646                                          "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 647         static const char magic_websocket_04_masking_guid[] =
 648                                          "61AC5F19-FBBA-4540-B96F-6561F1AB40A8";
 649         char hash[20];
 650         char pkt[1024];
 651         char *p = &pkt[0];
 652         const char *pc;
 653         const char *c;
 654         int more = 1;
 655         int okay = 0;
 656         char ext_name[128];
 657         struct lws_tokens eff_buf;
 658         int ext_count = 0;
 659         struct libwebsocket_extension *ext;
 660         int opt = 1;
 661
 662 #ifdef LWS_OPENSSL_SUPPORT
 663         char ssl_err_buf[512];
 664 #endif
 665         /*
 666          * you can call us with pollfd = NULL to just allow the once-per-second
 667          * global timeout checks; if less than a second since the last check
 668          * it returns immediately then.
 669          */
 670
 671         gettimeofday(&tv, NULL);
 672
 673         if (context->last_timeout_check_s != tv.tv_sec) {
 674                 context->last_timeout_check_s = tv.tv_sec;
 675
 676                 /* global timeout check once per second */
 677
 678                 for (n = 0; n < context->fds_count; n++) {
 679                         wsi = wsi_from_fd(context, context->fds[n].fd);
 680                         if (!wsi->pending_timeout)
 681                                 continue;
 682
 683                         /*
 684                          * if we went beyond the allowed time, kill the
 685                          * connection
 686                          */
 687
 688                         if (tv.tv_sec > wsi->pending_timeout_limit) {
 689                                 fprintf(stderr, "TIMEDOUT WAITING\n");
 690                                 libwebsocket_close_and_free_session(context,
 691                                                 wsi, LWS_CLOSE_STATUS_NOSTATUS);
 692                         }
 693                 }
 694         }
 695
 696         /* just here for timeout management? */
 697
 698         if (pollfd == NULL)
 699                 return 0;
 700
 701         /* no, here to service a socket descriptor */
 702
 703         wsi = wsi_from_fd(context, pollfd->fd);
 704
 705         if (wsi == NULL)
 706                 return 1;
 707
 708         switch (wsi->mode) {
 709         case LWS_CONNMODE_SERVER_LISTENER:
 710
 711                 /* pollin means a client has connected to us then */
 712
 713                 if (!pollfd->revents & POLLIN)
 714                         break;
 715
 716                 /* listen socket got an unencrypted connection... */
 717
 718                 clilen = sizeof(cli_addr);
 719                 accept_fd  = accept(pollfd->fd, (struct sockaddr *)&cli_addr,
 720                                                                        &clilen);
 721                 if (accept_fd < 0) {
 722                         fprintf(stderr, "ERROR on accept");
 723                         break;
 724                 }
 725
 726                 /* Disable Nagle */
 727                 opt = 1;
 728                 setsockopt(accept_fd, IPPROTO_TCP, TCP_NODELAY, &opt,
 729                                 sizeof(opt));
 730
 731                 if (context->fds_count >= MAX_CLIENTS) {
 732                         fprintf(stderr, "too busy to accept new client\n");
 733 #ifdef WIN32
 734                         closesocket(accept_fd);
 735 #else
 736                         close(accept_fd);
 737 #endif
 738                         break;
 739                 }
 740
 741                 /*
 742                  * look at who we connected to and give user code a chance
 743                  * to reject based on client IP.  There's no protocol selected
 744                  * yet so we issue this to protocols[0]
 745                  */
 746
 747                 if ((context->protocols[0].callback)(context, wsi,
 748                                 LWS_CALLBACK_FILTER_NETWORK_CONNECTION,
 749                                              (void*)(long)accept_fd, NULL, 0)) {
 750                         fprintf(stderr, "Callback denied network connection\n");
 751 #ifdef WIN32
 752                         closesocket(accept_fd);
 753 #else
 754                         close(accept_fd);
 755 #endif
 756                         break;
 757                 }
 758
 759                 /* accepting connection to main listener */
 760
 761                 new_wsi = malloc(sizeof(struct libwebsocket));
 762                 if (new_wsi == NULL) {
 763                         fprintf(stderr, "Out of memory for new connection\n");
 764                         break;
 765                 }
 766
 767                 memset(new_wsi, 0, sizeof (struct libwebsocket));
 768                 new_wsi->sock = accept_fd;
 769                 new_wsi->count_active_extensions = 0;
 770                 new_wsi->pending_timeout = NO_PENDING_TIMEOUT;
 771
 772 #ifdef LWS_OPENSSL_SUPPORT
 773                 new_wsi->ssl = NULL;
 774
 775                 if (context->use_ssl) {
 776
 777                         new_wsi->ssl = SSL_new(context->ssl_ctx);
 778                         if (new_wsi->ssl == NULL) {
 779                                 fprintf(stderr, "SSL_new failed: %s\n",
 780                                     ERR_error_string(SSL_get_error(
 781                                     new_wsi->ssl, 0), NULL));
 782                                     libwebsockets_decode_ssl_error();
 783                                 free(new_wsi);
 784                                 break;
 785                         }
 786
 787                         SSL_set_fd(new_wsi->ssl, accept_fd);
 788
 789                         n = SSL_accept(new_wsi->ssl);
 790                         if (n != 1) {
 791                                 /*
 792                                  * browsers seem to probe with various
 793                                  * ssl params which fail then retry
 794                                  * and succeed
 795                                  */
 796                                 debug("SSL_accept failed skt %u: %s\n",
 797                                       pollfd->fd,
 798                                       ERR_error_string(SSL_get_error(
 799                                       new_wsi->ssl, n), NULL));
 800                                 SSL_free(
 801                                        new_wsi->ssl);
 802                                 free(new_wsi);
 803                                 break;
 804                         }
 805
 806                         debug("accepted new SSL conn  "
 807                               "port %u on fd=%d SSL ver %s\n",
 808                                 ntohs(cli_addr.sin_port), accept_fd,
 809                                   SSL_get_version(new_wsi->ssl));
 810
 811                 } else
 812 #endif
 813                         debug("accepted new conn  port %u on fd=%d\n",
 814                                           ntohs(cli_addr.sin_port), accept_fd);
 815
 816                 /* intialize the instance struct */
 817
 818                 new_wsi->state = WSI_STATE_HTTP;
 819                 new_wsi->name_buffer_pos = 0;
 820                 new_wsi->mode = LWS_CONNMODE_WS_SERVING;
 821
 822                 for (n = 0; n < WSI_TOKEN_COUNT; n++) {
 823                         new_wsi->utf8_token[n].token = NULL;
 824                         new_wsi->utf8_token[n].token_len = 0;
 825                 }
 826
 827                 /*
 828                  * these can only be set once the protocol is known
 829                  * we set an unestablished connection's protocol pointer
 830                  * to the start of the supported list, so it can look
 831                  * for matching ones during the handshake
 832                  */
 833                 new_wsi->protocol = context->protocols;
 834                 new_wsi->user_space = NULL;
 835
 836                 /*
 837                  * Default protocol is 76 / 00
 838                  * After 76, there's a header specified to inform which
 839                  * draft the client wants, when that's seen we modify
 840                  * the individual connection's spec revision accordingly
 841                  */
 842                 new_wsi->ietf_spec_revision = 0;
 843
 844                 insert_wsi(context, new_wsi);
 845
 846                 /*
 847                  * make sure NO events are seen yet on this new socket
 848                  * (otherwise we inherit old fds[client].revents from
 849                  * previous socket there and die mysteriously! )
 850                  */
 851                 context->fds[context->fds_count].revents = 0;
 852
 853                 context->fds[context->fds_count].events = POLLIN;
 854                 context->fds[context->fds_count++].fd = accept_fd;
 855
 856                 /* external POLL support via protocol 0 */
 857                 context->protocols[0].callback(context, new_wsi,
 858                         LWS_CALLBACK_ADD_POLL_FD,
 859                         (void *)(long)accept_fd, NULL, POLLIN);
 860
 861                 break;
 862
 863         case LWS_CONNMODE_BROADCAST_PROXY_LISTENER:
 864
 865                 /* as we are listening, POLLIN means accept() is needed */
 866
 867                 if (!pollfd->revents & POLLIN)
 868                         break;
 869
 870                 /* listen socket got an unencrypted connection... */
 871
 872                 clilen = sizeof(cli_addr);
 873                 accept_fd  = accept(pollfd->fd, (struct sockaddr *)&cli_addr,
 874                                                                        &clilen);
 875                 if (accept_fd < 0) {
 876                         fprintf(stderr, "ERROR on accept");
 877                         break;
 878                 }
 879
 880                 if (context->fds_count >= MAX_CLIENTS) {
 881                         fprintf(stderr, "too busy to accept new broadcast "
 882                                                               "proxy client\n");
 883 #ifdef WIN32
 884                         closesocket(accept_fd);
 885 #else
 886                         close(accept_fd);
 887 #endif
 888                         break;
 889                 }
 890
 891                 /* create a dummy wsi for the connection and add it */
 892
 893                 new_wsi = malloc(sizeof(struct libwebsocket));
 894                 memset(new_wsi, 0, sizeof (struct libwebsocket));
 895                 new_wsi->sock = accept_fd;
 896                 new_wsi->mode = LWS_CONNMODE_BROADCAST_PROXY;
 897                 new_wsi->state = WSI_STATE_ESTABLISHED;
 898                 new_wsi->count_active_extensions = 0;
 899                 /* note which protocol we are proxying */
 900                 new_wsi->protocol_index_for_broadcast_proxy =
 901                                         wsi->protocol_index_for_broadcast_proxy;
 902                 insert_wsi(context, new_wsi);
 903
 904                 /* add connected socket to internal poll array */
 905
 906                 context->fds[context->fds_count].revents = 0;
 907                 context->fds[context->fds_count].events = POLLIN;
 908                 context->fds[context->fds_count++].fd = accept_fd;
 909
 910                 /* external POLL support via protocol 0 */
 911                 context->protocols[0].callback(context, new_wsi,
 912                         LWS_CALLBACK_ADD_POLL_FD,
 913                         (void *)(long)accept_fd, NULL, POLLIN);
 914
 915                 break;
 916
 917         case LWS_CONNMODE_BROADCAST_PROXY:
 918
 919                 /* handle session socket closed */
 920
 921                 if (pollfd->revents & (POLLERR | POLLHUP)) {
 922
 923                         debug("Session Socket %p (fd=%d) dead\n",
 924                                 (void *)wsi, pollfd->fd);
 925
 926                         libwebsocket_close_and_free_session(context, wsi,
 927                                                        LWS_CLOSE_STATUS_NORMAL);
 928                         return 1;
 929                 }
 930
 931                 /*
 932                  * either extension code with stuff to spill, or the user code,
 933                  * requested a callback when it was OK to write
 934                  */
 935
 936                 if (pollfd->revents & POLLOUT)
 937                         if (lws_handle_POLLOUT_event(context, wsi, pollfd) < 0) {
 938                                 libwebsocket_close_and_free_session(context, wsi,
 939                                                        LWS_CLOSE_STATUS_NORMAL);
 940                                 return 1;
 941                         }
 942
 943                 /* any incoming data ready? */
 944
 945                 if (!(pollfd->revents & POLLIN))
 946                         break;
 947
 948                 /* get the issued broadcast payload from the socket */
 949
 950                 len = read(pollfd->fd, buf + LWS_SEND_BUFFER_PRE_PADDING,
 951                                                          MAX_BROADCAST_PAYLOAD);
 952                 if (len < 0) {
 953                         fprintf(stderr, "Error reading broadcast payload\n");
 954                         break;
 955                 }
 956
 957                 /* broadcast it to all guys with this protocol index */
 958
 959                 for (n = 0; n < FD_HASHTABLE_MODULUS; n++) {
 960
 961                         for (m = 0; m < context->fd_hashtable[n].length; m++) {
 962
 963                                 new_wsi = context->fd_hashtable[n].wsi[m];
 964
 965                                 /* only to clients we are serving to */
 966
 967                                 if (new_wsi->mode != LWS_CONNMODE_WS_SERVING)
 968                                         continue;
 969
 970                                 /*
 971                                  * never broadcast to non-established
 972                                  * connection
 973                                  */
 974
 975                                 if (new_wsi->state != WSI_STATE_ESTABLISHED)
 976                                         continue;
 977
 978                                 /*
 979                                  * only broadcast to connections using
 980                                  * the requested protocol
 981                                  */
 982
 983                                 if (new_wsi->protocol->protocol_index !=
 984                                         wsi->protocol_index_for_broadcast_proxy)
 985                                         continue;
 986
 987                                 /* broadcast it to this connection */
 988
 989                                 new_wsi->protocol->callback(context, new_wsi,
 990                                         LWS_CALLBACK_BROADCAST,
 991                                         new_wsi->user_space,
 992                                         buf + LWS_SEND_BUFFER_PRE_PADDING, len);
 993                         }
 994                 }
 995                 break;
 996
 997         case LWS_CONNMODE_WS_CLIENT_WAITING_PROXY_REPLY:
 998
 999                 /* handle proxy hung up on us */
1000
1001                 if (pollfd->revents & (POLLERR | POLLHUP)) {
1002
1003                         fprintf(stderr, "Proxy connection %p (fd=%d) dead\n",
1004                                 (void *)wsi, pollfd->fd);
1005
1006                         libwebsocket_close_and_free_session(context, wsi,
1007                                                      LWS_CLOSE_STATUS_NOSTATUS);
1008                         return 1;
1009                 }
1010
1011                 n = recv(wsi->sock, pkt, sizeof pkt, 0);
1012                 if (n < 0) {
1013                         libwebsocket_close_and_free_session(context, wsi,
1014                                                      LWS_CLOSE_STATUS_NOSTATUS);
1015                         fprintf(stderr, "ERROR reading from proxy socket\n");
1016                         return 1;
1017                 }
1018
1019                 pkt[13] = '\0';
1020                 if (strcmp(pkt, "HTTP/1.0 200 ") != 0) {
1021                         libwebsocket_close_and_free_session(context, wsi,
1022                                                      LWS_CLOSE_STATUS_NOSTATUS);
1023                         fprintf(stderr, "ERROR from proxy: %s\n", pkt);
1024                         return 1;
1025                 }
1026
1027                 /* clear his proxy connection timeout */
1028
1029                 libwebsocket_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
1030
1031                 /* fallthru */
1032
1033         case LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE:
1034
1035         #ifdef LWS_OPENSSL_SUPPORT
1036                 if (wsi->use_ssl) {
1037
1038                         wsi->ssl = SSL_new(context->ssl_client_ctx);
1039                         wsi->client_bio = BIO_new_socket(wsi->sock,
1040                                                                    BIO_NOCLOSE);
1041                         SSL_set_bio(wsi->ssl, wsi->client_bio, wsi->client_bio);
1042
1043                         SSL_set_ex_data(wsi->ssl,
1044                                         openssl_websocket_private_data_index,
1045                                                                        context);
1046
1047                         if (SSL_connect(wsi->ssl) <= 0) {
1048                                 fprintf(stderr, "SSL connect error %s\n",
1049                                         ERR_error_string(ERR_get_error(),
1050                                                                   ssl_err_buf));
1051                                 libwebsocket_close_and_free_session(context, wsi,
1052                                                      LWS_CLOSE_STATUS_NOSTATUS);
1053                                 return 1;
1054                         }
1055
1056                         n = SSL_get_verify_result(wsi->ssl);
1057                         if ((n != X509_V_OK) && (
1058                                 n != X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT ||
1059                                                            wsi->use_ssl != 2)) {
1060
1061                                 fprintf(stderr, "server's cert didn't "
1062                                                            "look good %d\n", n);
1063                                 libwebsocket_close_and_free_session(context,
1064                                                 wsi, LWS_CLOSE_STATUS_NOSTATUS);
1065                                 return 1;
1066                         }
1067                 } else {
1068                         wsi->ssl = NULL;
1069         #endif
1070
1071
1072         #ifdef LWS_OPENSSL_SUPPORT
1073                 }
1074         #endif
1075
1076                 /*
1077                  * create the random key
1078                  */
1079
1080                 n = libwebsockets_get_random(context, hash, 16);
1081                 if (n != 16) {
1082                         fprintf(stderr, "Unable to read from random dev %s\n",
1083                                                         SYSTEM_RANDOM_FILEPATH);
1084                         free(wsi->c_path);
1085                         free(wsi->c_host);
1086                         if (wsi->c_origin)
1087                                 free(wsi->c_origin);
1088                         if (wsi->c_protocol)
1089                                 free(wsi->c_protocol);
1090                         libwebsocket_close_and_free_session(context, wsi,
1091                                                      LWS_CLOSE_STATUS_NOSTATUS);
1092                         return 1;
1093                 }
1094
1095                 lws_b64_encode_string(hash, 16, wsi->key_b64,
1096                                                            sizeof wsi->key_b64);
1097
1098                 /*
1099                  * 00 example client handshake
1100                  *
1101                  * GET /socket.io/websocket HTTP/1.1
1102                  * Upgrade: WebSocket
1103                  * Connection: Upgrade
1104                  * Host: 127.0.0.1:9999
1105                  * Origin: http://127.0.0.1
1106                  * Sec-WebSocket-Key1: 1 0 2#0W 9 89 7  92 ^
1107                  * Sec-WebSocket-Key2: 7 7Y 4328 B2v[8(z1
1108                  * Cookie: socketio=websocket
1109                  *
1110                  * (Á®Ä0¶†≥
1111                  *
1112                  * 04 example client handshake
1113                  *
1114                  * GET /chat HTTP/1.1
1115                  * Host: server.example.com
1116                  * Upgrade: websocket
1117                  * Connection: Upgrade
1118                  * Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
1119                  * Sec-WebSocket-Origin: http://example.com
1120                  * Sec-WebSocket-Protocol: chat, superchat
1121                  * Sec-WebSocket-Version: 4
1122                  */
1123
1124                 p += sprintf(p, "GET %s HTTP/1.1\x0d\x0a", wsi->c_path);
1125
1126                 if (wsi->ietf_spec_revision == 0) {
1127                         unsigned char spaces_1, spaces_2;
1128                         unsigned int max_1, max_2;
1129                         unsigned int num_1, num_2;
1130                         unsigned long product_1, product_2;
1131                         char key_1[40];
1132                         char key_2[40];
1133                         unsigned int seed;
1134                         unsigned int count;
1135                         char challenge[16];
1136
1137                         libwebsockets_get_random(context, &spaces_1,
1138                                                                   sizeof(char));
1139                         libwebsockets_get_random(context, &spaces_2,
1140                                                                   sizeof(char));
1141
1142                         spaces_1 = (spaces_1 % 12) + 1;
1143                         spaces_2 = (spaces_2 % 12) + 1;
1144
1145                         max_1 = 4294967295 / spaces_1;
1146                         max_2 = 4294967295 / spaces_2;
1147
1148                         libwebsockets_get_random(context, &num_1, sizeof(int));
1149                         libwebsockets_get_random(context, &num_2, sizeof(int));
1150
1151                         num_1 = (num_1 % max_1);
1152                         num_2 = (num_2 % max_2);
1153
1154                         challenge[0] = num_1 >> 24;
1155                         challenge[1] = num_1 >> 16;
1156                         challenge[2] = num_1 >> 8;
1157                         challenge[3] = num_1;
1158                         challenge[4] = num_2 >> 24;
1159                         challenge[5] = num_2 >> 16;
1160                         challenge[6] = num_2 >> 8;
1161                         challenge[7] = num_2;
1162
1163                         product_1 = num_1 * spaces_1;
1164                         product_2 = num_2 * spaces_2;
1165
1166                         sprintf(key_1, "%lu", product_1);
1167                         sprintf(key_2, "%lu", product_2);
1168
1169                         libwebsockets_get_random(context, &seed, sizeof(int));
1170                         libwebsockets_get_random(context, &count, sizeof(int));
1171
1172                         libwebsockets_00_spam(key_1, (count % 12) + 1, seed);
1173
1174                         libwebsockets_get_random(context, &seed, sizeof(int));
1175                         libwebsockets_get_random(context, &count, sizeof(int));
1176
1177                         libwebsockets_00_spam(key_2, (count % 12) + 1, seed);
1178
1179                         libwebsockets_get_random(context, &seed, sizeof(int));
1180
1181                         libwebsockets_00_spaceout(key_1, spaces_1, seed);
1182                         libwebsockets_00_spaceout(key_2, spaces_2, seed >> 16);
1183
1184                         p += sprintf(p, "Upgrade: WebSocket\x0d\x0a"
1185                                 "Connection: Upgrade\x0d\x0aHost: %s\x0d\x0a",
1186                                 wsi->c_host);
1187                         if (wsi->c_origin)
1188                                 p += sprintf(p, "Origin: %s\x0d\x0a",
1189                                 wsi->c_origin);
1190
1191                         if (wsi->c_protocol)
1192                                 p += sprintf(p, "Sec-WebSocket-Protocol: %s"
1193                                                  "\x0d\x0a", wsi->c_protocol);
1194
1195                         p += sprintf(p, "Sec-WebSocket-Key1: %s\x0d\x0a",
1196                                 key_1);
1197                         p += sprintf(p, "Sec-WebSocket-Key2: %s\x0d\x0a",
1198                                 key_2);
1199
1200                         /* give userland a chance to append, eg, cookies */
1201
1202                         context->protocols[0].callback(context, wsi,
1203                                 LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER,
1204                                         NULL, &p, (pkt + sizeof(pkt)) - p - 12);
1205
1206                         p += sprintf(p, "\x0d\x0a");
1207
1208                         if (libwebsockets_get_random(context, p, 8) != 8)
1209                                 return -1;
1210                         memcpy(&challenge[8], p, 8);
1211                         p += 8;
1212
1213                         /* precompute what we want to see from the server */
1214
1215                         MD5((unsigned char *)challenge, 16,
1216                            (unsigned char *)wsi->initial_handshake_hash_base64);
1217
1218                         goto issue_hdr;
1219                 }
1220
1221                 p += sprintf(p, "Host: %s\x0d\x0a", wsi->c_host);
1222                 p += sprintf(p, "Upgrade: websocket\x0d\x0a");
1223                 p += sprintf(p, "Connection: Upgrade\x0d\x0a"
1224                                         "Sec-WebSocket-Key: ");
1225                 strcpy(p, wsi->key_b64);
1226                 p += strlen(wsi->key_b64);
1227                 p += sprintf(p, "\x0d\x0a");
1228                 if (wsi->c_origin)
1229                         p += sprintf(p, "Sec-WebSocket-Origin: %s\x0d\x0a",
1230                                                                  wsi->c_origin);
1231                 if (wsi->c_protocol)
1232                         p += sprintf(p, "Sec-WebSocket-Protocol: %s\x0d\x0a",
1233                                                                wsi->c_protocol);
1234
1235                 /* tell the server what extensions we could support */
1236
1237                 p += sprintf(p, "Sec-WebSocket-Extensions: ");
1238
1239                 ext =context->extensions;
1240                 while (ext && ext->callback) {
1241
1242                         n = 0;
1243                         n = context->protocols[0].callback(context, wsi,
1244                                 LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED,
1245                                         wsi->user_space, (char *)ext->name, 0);
1246
1247                         /*
1248                          * zero return from callback means
1249                          * go ahead and allow the extension,
1250                          * it's what we get if the callback is
1251                          * unhandled
1252                          */
1253
1254                         if (n) {
1255                                 ext++;
1256                                 continue;
1257                         }
1258
1259                         /* apply it */
1260
1261                         if (ext_count)
1262                                 *p++ = ',';
1263                         p += sprintf(p, "%s", ext->name);
1264                         ext_count++;
1265
1266                         ext++;
1267                 }
1268
1269                 p += sprintf(p, "\x0d\x0a");
1270
1271                 if (wsi->ietf_spec_revision)
1272                         p += sprintf(p, "Sec-WebSocket-Version: %d\x0d\x0a",
1273                                                        wsi->ietf_spec_revision);
1274
1275                 /* give userland a chance to append, eg, cookies */
1276
1277                 context->protocols[0].callback(context, wsi,
1278                         LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER,
1279                         NULL, &p, (pkt + sizeof(pkt)) - p - 12);
1280
1281                 p += sprintf(p, "\x0d\x0a");
1282
1283                 /* prepare the expected server accept response */
1284
1285                 strcpy((char *)buf, wsi->key_b64);
1286                 strcpy((char *)&buf[strlen((char *)buf)], magic_websocket_guid);
1287
1288                 SHA1(buf, strlen((char *)buf), (unsigned char *)hash);
1289
1290                 lws_b64_encode_string(hash, 20,
1291                                 wsi->initial_handshake_hash_base64,
1292                                      sizeof wsi->initial_handshake_hash_base64);
1293
1294 issue_hdr:
1295
1296                 /* done with these now */
1297
1298                 free(wsi->c_path);
1299                 free(wsi->c_host);
1300                 if (wsi->c_origin)
1301                         free(wsi->c_origin);
1302
1303                 /* send our request to the server */
1304
1305         #ifdef LWS_OPENSSL_SUPPORT
1306                 if (wsi->use_ssl)
1307                         n = SSL_write(wsi->ssl, pkt, p - pkt);
1308                 else
1309         #endif
1310                         n = send(wsi->sock, pkt, p - pkt, 0);
1311
1312                 if (n < 0) {
1313                         fprintf(stderr, "ERROR writing to client socket\n");
1314                         libwebsocket_close_and_free_session(context, wsi,
1315                                                      LWS_CLOSE_STATUS_NOSTATUS);
1316                         return 1;
1317                 }
1318
1319                 wsi->parser_state = WSI_TOKEN_NAME_PART;
1320                 wsi->mode = LWS_CONNMODE_WS_CLIENT_WAITING_SERVER_REPLY;
1321                 libwebsocket_set_timeout(wsi,
1322                                 PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE, 5);
1323
1324                 break;
1325
1326         case LWS_CONNMODE_WS_CLIENT_WAITING_SERVER_REPLY:
1327
1328                 /* handle server hung up on us */
1329
1330                 if (pollfd->revents & (POLLERR | POLLHUP)) {
1331
1332                         fprintf(stderr, "Server connection %p (fd=%d) dead\n",
1333                                 (void *)wsi, pollfd->fd);
1334
1335                         goto bail3;
1336                 }
1337
1338
1339                 /* interpret the server response */
1340
1341                 /*
1342                  *  HTTP/1.1 101 Switching Protocols
1343                  *  Upgrade: websocket
1344                  *  Connection: Upgrade
1345                  *  Sec-WebSocket-Accept: me89jWimTRKTWwrS3aRrL53YZSo=
1346                  *  Sec-WebSocket-Nonce: AQIDBAUGBwgJCgsMDQ4PEC==
1347                  *  Sec-WebSocket-Protocol: chat
1348                  */
1349
1350         #ifdef LWS_OPENSSL_SUPPORT
1351                 if (wsi->use_ssl)
1352                         len = SSL_read(wsi->ssl, pkt, sizeof pkt);
1353                 else
1354         #endif
1355                         len = recv(wsi->sock, pkt, sizeof pkt, 0);
1356
1357                 if (len < 0) {
1358                         fprintf(stderr,
1359                                   "libwebsocket_client_handshake read error\n");
1360                         goto bail3;
1361                 }
1362
1363                 p = pkt;
1364                 for (n = 0; n < len; n++)
1365                         libwebsocket_parse(wsi, *p++);
1366
1367                 /*
1368                  * may be coming in multiple packets, there is a 5-second
1369                  * libwebsocket timeout still active here too, so if parsing did
1370                  * not complete just wait for next packet coming in this state
1371                  */
1372
1373                 if (wsi->parser_state != WSI_PARSING_COMPLETE)
1374                         break;
1375
1376                 /*
1377                  * 00 / 76 -->
1378                  *
1379                  * HTTP/1.1 101 WebSocket Protocol Handshake
1380                  * Upgrade: WebSocket
1381                  * Connection: Upgrade
1382                  * Sec-WebSocket-Origin: http://127.0.0.1
1383                  * Sec-WebSocket-Location: ws://127.0.0.1:9999/socket.io/websocket
1384                  *
1385                  * xxxxxxxxxxxxxxxx
1386                  */
1387
1388                 if (wsi->ietf_spec_revision == 0) {
1389                         if (!wsi->utf8_token[WSI_TOKEN_HTTP].token_len ||
1390                             !wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len ||
1391                             !wsi->utf8_token[WSI_TOKEN_CHALLENGE].token_len ||
1392                             !wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len ||
1393                             (!wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len &&
1394                             wsi->c_protocol != NULL)) {
1395                                 fprintf(stderr, "libwebsocket_client_handshake "
1396                                                 "missing required header(s)\n");
1397                                 pkt[len] = '\0';
1398                                 fprintf(stderr, "%s", pkt);
1399                                 goto bail3;
1400                         }
1401
1402                         strtolower(wsi->utf8_token[WSI_TOKEN_HTTP].token);
1403                         if (strcmp(wsi->utf8_token[WSI_TOKEN_HTTP].token,
1404                                 "101 websocket protocol handshake")) {
1405                                 fprintf(stderr, "libwebsocket_client_handshake "
1406                                         "server sent bad HTTP response '%s'\n",
1407                                         wsi->utf8_token[WSI_TOKEN_HTTP].token);
1408                                 goto bail3;
1409                         }
1410
1411                         if (wsi->utf8_token[WSI_TOKEN_CHALLENGE].token_len <
1412                                                                            16) {
1413                                 fprintf(stderr, "libwebsocket_client_handshake "
1414                                         "challenge reply too short %d\n",
1415                                         wsi->utf8_token[
1416                                                 WSI_TOKEN_CHALLENGE].token_len);
1417                                 pkt[len] = '\0';
1418                                 fprintf(stderr, "%s", pkt);
1419                                 goto bail3;
1420
1421                         }
1422
1423                         goto select_protocol;
1424                 }
1425
1426                 /*
1427                  * well, what the server sent looked reasonable for syntax.
1428                  * Now let's confirm it sent all the necessary headers
1429                  */
1430
1431                  if (!wsi->utf8_token[WSI_TOKEN_HTTP].token_len ||
1432                         !wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len ||
1433                         !wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len ||
1434                         !wsi->utf8_token[WSI_TOKEN_ACCEPT].token_len ||
1435                         (!wsi->utf8_token[WSI_TOKEN_NONCE].token_len &&
1436                                            wsi->ietf_spec_revision == 4) ||
1437                         (!wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len &&
1438                                                      wsi->c_protocol != NULL)) {
1439                         fprintf(stderr, "libwebsocket_client_handshake "
1440                                                 "missing required header(s)\n");
1441                         pkt[len] = '\0';
1442                         fprintf(stderr, "%s", pkt);
1443                         goto bail3;
1444                 }
1445
1446                 /*
1447                  * Everything seems to be there, now take a closer look at what
1448                  * is in each header
1449                  */
1450
1451                 strtolower(wsi->utf8_token[WSI_TOKEN_HTTP].token);
1452                 if (strcmp(wsi->utf8_token[WSI_TOKEN_HTTP].token,
1453                                                    "101 switching protocols")) {
1454                         fprintf(stderr, "libwebsocket_client_handshake "
1455                                         "server sent bad HTTP response '%s'\n",
1456                                          wsi->utf8_token[WSI_TOKEN_HTTP].token);
1457                         goto bail3;
1458                 }
1459
1460                 strtolower(wsi->utf8_token[WSI_TOKEN_UPGRADE].token);
1461                 if (strcmp(wsi->utf8_token[WSI_TOKEN_UPGRADE].token,
1462                                                                  "websocket")) {
1463                         fprintf(stderr, "libwebsocket_client_handshake server "
1464                                         "sent bad Upgrade header '%s'\n",
1465                                       wsi->utf8_token[WSI_TOKEN_UPGRADE].token);
1466                         goto bail3;
1467                 }
1468
1469                 strtolower(wsi->utf8_token[WSI_TOKEN_CONNECTION].token);
1470                 if (strcmp(wsi->utf8_token[WSI_TOKEN_CONNECTION].token,
1471                                                                    "upgrade")) {
1472                         fprintf(stderr, "libwebsocket_client_handshake server "
1473                                         "sent bad Connection hdr '%s'\n",
1474                                    wsi->utf8_token[WSI_TOKEN_CONNECTION].token);
1475                         goto bail3;
1476                 }
1477
1478 select_protocol:
1479                 pc = wsi->c_protocol;
1480
1481                 /*
1482                  * confirm the protocol the server wants to talk was in the list
1483                  * of protocols we offered
1484                  */
1485
1486                 if (!wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len) {
1487
1488                         /*
1489                          * no protocol name to work from,
1490                          * default to first protocol
1491                          */
1492                         wsi->protocol = &context->protocols[0];
1493
1494                         free(wsi->c_protocol);
1495
1496                         goto check_accept;
1497                 }
1498
1499                 while (*pc && !okay) {
1500                         if ((!strncmp(pc,
1501                                 wsi->utf8_token[WSI_TOKEN_PROTOCOL].token,
1502                            wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len)) &&
1503                  (pc[wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len] == ',' ||
1504                    pc[wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len] == '\0')) {
1505                                 okay = 1;
1506                                 continue;
1507                         }
1508                         while (*pc && *pc != ',')
1509                                 pc++;
1510                         while (*pc && *pc != ' ')
1511                                 pc++;
1512                 }
1513
1514                 /* done with him now */
1515
1516                 if (wsi->c_protocol)
1517                         free(wsi->c_protocol);
1518
1519
1520                 if (!okay) {
1521                         fprintf(stderr, "libwebsocket_client_handshake server "
1522                                                 "sent bad protocol '%s'\n",
1523                                      wsi->utf8_token[WSI_TOKEN_PROTOCOL].token);
1524                         goto bail2;
1525                 }
1526
1527                 /*
1528                  * identify the selected protocol struct and set it
1529                  */
1530                 n = 0;
1531                 wsi->protocol = NULL;
1532                 while (context->protocols[n].callback) {
1533                         if (strcmp(wsi->utf8_token[WSI_TOKEN_PROTOCOL].token,
1534                                                context->protocols[n].name) == 0)
1535                                 wsi->protocol = &context->protocols[n];
1536                         n++;
1537                 }
1538
1539                 if (wsi->protocol == NULL) {
1540                         fprintf(stderr, "libwebsocket_client_handshake server "
1541                                         "requested protocol '%s', which we "
1542                                         "said we supported but we don't!\n",
1543                                      wsi->utf8_token[WSI_TOKEN_PROTOCOL].token);
1544                         goto bail2;
1545                 }
1546
1547
1548                 /* instantiate the accepted extensions */
1549
1550                 if (!wsi->utf8_token[WSI_TOKEN_EXTENSIONS].token_len)
1551                         goto check_accept;
1552
1553                 /*
1554                  * break down the list of server accepted extensions
1555                  * and go through matching them or identifying bogons
1556                  */
1557
1558                 c = wsi->utf8_token[WSI_TOKEN_EXTENSIONS].token;
1559                 n = 0;
1560                 while (more) {
1561
1562                         if (*c && *c != ',') {
1563                                 ext_name[n] = *c++;
1564                                 if (n < sizeof(ext_name) - 1)
1565                                         n++;
1566                                 continue;
1567                         }
1568                         ext_name[n] = '\0';
1569                         if (!*c)
1570                                 more = 0;
1571
1572                         /* check we actually support it */
1573
1574                         n = 0;
1575                         ext = wsi->protocol->owning_server->extensions;
1576                         while (ext && ext->callback) {
1577
1578                                 if (strcmp(ext_name, ext->name)) {
1579                                         ext++;
1580                                         continue;
1581                                 }
1582
1583                                 n = 1;
1584
1585                                 /* instantiate the extension on this conn */
1586
1587                                 wsi->active_extensions_user[
1588                                         wsi->count_active_extensions] =
1589                                              malloc(ext->per_session_data_size);
1590                                 wsi->active_extensions[
1591                                           wsi->count_active_extensions] = ext;
1592
1593                                 /* allow him to construct his context */
1594
1595                                 ext->callback(wsi->protocol->owning_server,
1596                                         ext, wsi,
1597                                            LWS_EXT_CALLBACK_CLIENT_CONSTRUCT,
1598                                                 wsi->active_extensions_user[
1599                                                  wsi->count_active_extensions],
1600                                                                        NULL, 0);
1601
1602                                 wsi->count_active_extensions++;
1603
1604                                 ext++;
1605                         }
1606
1607                         if (n == 0) {
1608                                 fprintf(stderr, "Server said we should use"
1609                                       "an unknown extension '%s'!\n", ext_name);
1610                                 goto bail2;
1611                         }
1612
1613                         n = 0;
1614                 }
1615
1616
1617         check_accept:
1618
1619                 if (wsi->ietf_spec_revision == 0) {
1620
1621                         if (memcmp(wsi->initial_handshake_hash_base64,
1622                               wsi->utf8_token[WSI_TOKEN_CHALLENGE].token, 16)) {
1623                                 fprintf(stderr, "libwebsocket_client_handshake "
1624                                                "failed 00 challenge compare\n");
1625                                         pkt[len] = '\0';
1626                                         fprintf(stderr, "%s", pkt);
1627                                         goto bail2;
1628                         }
1629
1630                         goto accept_ok;
1631                 }
1632
1633                 /*
1634                  * Confirm his accept token is the one we precomputed
1635                  */
1636
1637                 if (strcmp(wsi->utf8_token[WSI_TOKEN_ACCEPT].token,
1638                                           wsi->initial_handshake_hash_base64)) {
1639                         fprintf(stderr, "libwebsocket_client_handshake server "
1640                                 "sent bad ACCEPT '%s' vs computed '%s'\n",
1641                                 wsi->utf8_token[WSI_TOKEN_ACCEPT].token,
1642                                             wsi->initial_handshake_hash_base64);
1643                         goto bail2;
1644                 }
1645
1646                 if (wsi->ietf_spec_revision == 4) {
1647                         /*
1648                          * Calculate the 04 masking key to use when
1649                          * sending data to server
1650                          */
1651
1652                         strcpy((char *)buf, wsi->key_b64);
1653                         p = (char *)buf + strlen(wsi->key_b64);
1654                         strcpy(p, wsi->utf8_token[WSI_TOKEN_NONCE].token);
1655                         p += wsi->utf8_token[WSI_TOKEN_NONCE].token_len;
1656                         strcpy(p, magic_websocket_04_masking_guid);
1657                         SHA1(buf, strlen((char *)buf), wsi->masking_key_04);
1658                 }
1659 accept_ok:
1660
1661                 /* allocate the per-connection user memory (if any) */
1662
1663                 if (wsi->protocol->per_session_data_size) {
1664                         wsi->user_space = malloc(
1665                                           wsi->protocol->per_session_data_size);
1666                         if (wsi->user_space  == NULL) {
1667                                 fprintf(stderr, "Out of memory for "
1668                                                            "conn user space\n");
1669                                 goto bail2;
1670                         }
1671                 } else
1672                         wsi->user_space = NULL;
1673
1674                 /* clear his proxy connection timeout */
1675
1676                 libwebsocket_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
1677
1678                 /* mark him as being alive */
1679
1680                 wsi->state = WSI_STATE_ESTABLISHED;
1681                 wsi->mode = LWS_CONNMODE_WS_CLIENT;
1682
1683                 fprintf(stderr, "handshake OK for protocol %s\n",
1684                                                            wsi->protocol->name);
1685
1686                 /* call him back to inform him he is up */
1687
1688                 wsi->protocol->callback(context, wsi,
1689                                  LWS_CALLBACK_CLIENT_ESTABLISHED,
1690                                  wsi->user_space,
1691                                  NULL, 0);
1692
1693                 break;
1694
1695 bail3:
1696                 if (wsi->c_protocol)
1697                         free(wsi->c_protocol);
1698
1699 bail2:
1700                 libwebsocket_close_and_free_session(context, wsi,
1701                                                      LWS_CLOSE_STATUS_NOSTATUS);
1702                 return 1;
1703
1704
1705         case LWS_CONNMODE_WS_SERVING:
1706         case LWS_CONNMODE_WS_CLIENT:
1707
1708                 /* handle session socket closed */
1709
1710                 if (pollfd->revents & (POLLERR | POLLHUP)) {
1711
1712                         fprintf(stderr, "Session Socket %p (fd=%d) dead\n",
1713                                 (void *)wsi, pollfd->fd);
1714
1715                         libwebsocket_close_and_free_session(context, wsi,
1716                                                      LWS_CLOSE_STATUS_NOSTATUS);
1717                         return 1;
1718                 }
1719
1720                 /* the guy requested a callback when it was OK to write */
1721
1722                 if ((pollfd->revents & POLLOUT) &&
1723                                             wsi->state == WSI_STATE_ESTABLISHED)
1724                         if (lws_handle_POLLOUT_event(context, wsi,
1725                                                                   pollfd) < 0) {
1726                                 libwebsocket_close_and_free_session(
1727                                          context, wsi, LWS_CLOSE_STATUS_NORMAL);
1728                                 return 1;
1729                         }
1730
1731
1732                 /* any incoming data ready? */
1733
1734                 if (!(pollfd->revents & POLLIN))
1735                         break;
1736
1737 #ifdef LWS_OPENSSL_SUPPORT
1738                 if (wsi->ssl)
1739                         eff_buf.token_len = SSL_read(wsi->ssl, buf, sizeof buf);
1740                 else
1741 #endif
1742                         eff_buf.token_len =
1743                                            recv(pollfd->fd, buf, sizeof buf, 0);
1744
1745                 if (eff_buf.token_len < 0) {
1746                         fprintf(stderr, "Socket read returned %d\n",
1747                                                             eff_buf.token_len);
1748                         break;
1749                 }
1750                 if (!eff_buf.token_len) {
1751                         libwebsocket_close_and_free_session(context, wsi,
1752                                                      LWS_CLOSE_STATUS_NOSTATUS);
1753                         return 1;
1754                 }
1755
1756                 /*
1757                  * give any active extensions a chance to munge the buffer
1758                  * before parse.  We pass in a pointer to an lws_tokens struct
1759                  * prepared with the default buffer and content length that's in
1760                  * there.  Rather than rewrite the default buffer, extensions
1761                  * that expect to grow the buffer can adapt .token to
1762                  * point to their own per-connection buffer in the extension
1763                  * user allocation.  By default with no extensions or no
1764                  * extension callback handling, just the normal input buffer is
1765                  * used then so it is efficient.
1766                  */
1767
1768                 eff_buf.token = (char *)buf;
1769
1770                 more = 1;
1771                 while (more) {
1772
1773                         more = 0;
1774
1775                         for (n = 0; n < wsi->count_active_extensions; n++) {
1776                                 m = wsi->active_extensions[n]->callback(context,
1777                                         wsi->active_extensions[n], wsi,
1778                                         LWS_EXT_CALLBACK_PACKET_RX_PREPARSE,
1779                                         wsi->active_extensions_user[n],
1780                                                                    &eff_buf, 0);
1781                                 if (m < 0) {
1782                                         fprintf(stderr, "Extension reports fatal error\n");
1783                                         libwebsocket_close_and_free_session(context, wsi,
1784                                                              LWS_CLOSE_STATUS_NOSTATUS);
1785                                         return 1;
1786                                 }
1787                                 if (m)
1788                                         more = 1;
1789                         }
1790
1791                         /* service incoming data */
1792
1793                         if (eff_buf.token_len) {
1794                                 n = libwebsocket_read(context, wsi,
1795                                      (unsigned char *)eff_buf.token, eff_buf.token_len);
1796                                 if (n < 0)
1797                                         /* we closed wsi */
1798                                         return 1;
1799                         }
1800
1801                         eff_buf.token = NULL;
1802                         eff_buf.token_len = 0;
1803                 }
1804                 break;
1805         }
1806
1807         return 0;
1808 }
1809
1810
1811 /**
1812  * libwebsocket_context_destroy() - Destroy the websocket context
1813  * @context:    Websocket context
1814  *
1815  *      This function closes any active connections and then frees the
1816  *      context.  After calling this, any further use of the context is
1817  *      undefined.
1818  */
1819 void
1820 libwebsocket_context_destroy(struct libwebsocket_context *context)
1821 {
1822         int n;
1823         int m;
1824         struct libwebsocket *wsi;
1825
1826         for (n = 0; n < FD_HASHTABLE_MODULUS; n++)
1827                 for (m = 0; m < context->fd_hashtable[n].length; m++) {
1828                         wsi = context->fd_hashtable[n].wsi[m];
1829                         libwebsocket_close_and_free_session(context, wsi,
1830                                                     LWS_CLOSE_STATUS_GOINGAWAY);
1831                 }
1832
1833 #ifdef WIN32
1834 #else
1835         close(context->fd_random);
1836 #endif
1837
1838 #ifdef LWS_OPENSSL_SUPPORT
1839         if (context->ssl_ctx)
1840                 SSL_CTX_free(context->ssl_ctx);
1841         if (context->ssl_client_ctx)
1842                 SSL_CTX_free(context->ssl_client_ctx);
1843 #endif
1844
1845         free(context);
1846
1847 #ifdef WIN32
1848         WSACleanup();
1849 #endif
1850 }
1851
1852 /**
1853  * libwebsocket_service() - Service any pending websocket activity
1854  * @context:    Websocket context
1855  * @timeout_ms: Timeout for poll; 0 means return immediately if nothing needed
1856  *              service otherwise block and service immediately, returning
1857  *              after the timeout if nothing needed service.
1858  *
1859  *      This function deals with any pending websocket traffic, for three
1860  *      kinds of event.  It handles these events on both server and client
1861  *      types of connection the same.
1862  *
1863  *      1) Accept new connections to our context's server
1864  *
1865  *      2) Perform pending broadcast writes initiated from other forked
1866  *         processes (effectively serializing asynchronous broadcasts)
1867  *
1868  *      3) Call the receive callback for incoming frame data received by
1869  *          server or client connections.
1870  *
1871  *      You need to call this service function periodically to all the above
1872  *      functions to happen; if your application is single-threaded you can
1873  *      just call it in your main event loop.
1874  *
1875  *      Alternatively you can fork a new process that asynchronously handles
1876  *      calling this service in a loop.  In that case you are happy if this
1877  *      call blocks your thread until it needs to take care of something and
1878  *      would call it with a large nonzero timeout.  Your loop then takes no
1879  *      CPU while there is nothing happening.
1880  *
1881  *      If you are calling it in a single-threaded app, you don't want it to
1882  *      wait around blocking other things in your loop from happening, so you
1883  *      would call it with a timeout_ms of 0, so it returns immediately if
1884  *      nothing is pending, or as soon as it services whatever was pending.
1885  */
1886
1887
1888 int
1889 libwebsocket_service(struct libwebsocket_context *context, int timeout_ms)
1890 {
1891         int n;
1892
1893         /* stay dead once we are dead */
1894
1895         if (context == NULL)
1896                 return 1;
1897
1898         /* wait for something to need service */
1899
1900         n = poll(context->fds, context->fds_count, timeout_ms);
1901         if (n == 0) /* poll timeout */
1902                 return 0;
1903
1904         if (n < 0) {
1905                 /*
1906                 fprintf(stderr, "Listen Socket dead\n");
1907                 */
1908                 return 1;
1909         }
1910
1911         /* handle accept on listening socket? */
1912
1913         for (n = 0; n < context->fds_count; n++)
1914                 if (context->fds[n].revents)
1915                         libwebsocket_service_fd(context, &context->fds[n]);
1916
1917         return 0;
1918 }
1919
1920 /**
1921  * libwebsocket_callback_on_writable() - Request a callback when this socket
1922  *                                       becomes able to be written to without
1923  *                                       blocking
1924  *
1925  * @context:    libwebsockets context
1926  * @wsi:        Websocket connection instance to get callback for
1927  */
1928
1929 int
1930 libwebsocket_callback_on_writable(struct libwebsocket_context *context,
1931                                                        struct libwebsocket *wsi)
1932 {
1933         int n;
1934
1935         for (n = 0; n < context->fds_count; n++)
1936                 if (context->fds[n].fd == wsi->sock) {
1937                         context->fds[n].events |= POLLOUT;
1938                         n = context->fds_count;
1939                 }
1940
1941         /* external POLL support via protocol 0 */
1942         context->protocols[0].callback(context, wsi,
1943                 LWS_CALLBACK_SET_MODE_POLL_FD,
1944                 (void *)(long)wsi->sock, NULL, POLLOUT);
1945
1946         return 1;
1947 }
1948
1949 /**
1950  * libwebsocket_callback_on_writable_all_protocol() - Request a callback for
1951  *                      all connections using the given protocol when it
1952  *                      becomes possible to write to each socket without
1953  *                      blocking in turn.
1954  *
1955  * @protocol:   Protocol whose connections will get callbacks
1956  */
1957
1958 int
1959 libwebsocket_callback_on_writable_all_protocol(
1960                                   const struct libwebsocket_protocols *protocol)
1961 {
1962         struct libwebsocket_context *context = protocol->owning_server;
1963         int n;
1964         int m;
1965         struct libwebsocket *wsi;
1966
1967         for (n = 0; n < FD_HASHTABLE_MODULUS; n++) {
1968
1969                 for (m = 0; m < context->fd_hashtable[n].length; m++) {
1970
1971                         wsi = context->fd_hashtable[n].wsi[m];
1972
1973                         if (wsi->protocol == protocol)
1974                                 libwebsocket_callback_on_writable(context, wsi);
1975                 }
1976         }
1977
1978         return 0;
1979 }
1980
1981 /**
1982  * libwebsocket_set_timeout() - marks the wsi as subject to a timeout
1983  *
1984  * You will not need this unless you are doing something special
1985  *
1986  * @wsi:        Websocket connection instance
1987  * @reason:     timeout reason
1988  * @secs:       how many seconds
1989  */
1990
1991 void
1992 libwebsocket_set_timeout(struct libwebsocket *wsi,
1993                                           enum pending_timeout reason, int secs)
1994 {
1995         struct timeval tv;
1996
1997         gettimeofday(&tv, NULL);
1998
1999         wsi->pending_timeout_limit = tv.tv_sec + secs;
2000         wsi->pending_timeout = reason;
2001 }
2002
2003
2004 /**
2005  * libwebsocket_get_socket_fd() - returns the socket file descriptor
2006  *
2007  * You will not need this unless you are doing something special
2008  *
2009  * @wsi:        Websocket connection instance
2010  */
2011
2012 int
2013 libwebsocket_get_socket_fd(struct libwebsocket *wsi)
2014 {
2015         return wsi->sock;
2016 }
2017
2018 /**
2019  * libwebsocket_rx_flow_control() - Enable and disable socket servicing for
2020  *                              receieved packets.
2021  *
2022  * If the output side of a server process becomes choked, this allows flow
2023  * control for the input side.
2024  *
2025  * @wsi:        Websocket connection instance to get callback for
2026  * @enable:     0 = disable read servicing for this connection, 1 = enable
2027  */
2028
2029 int
2030 libwebsocket_rx_flow_control(struct libwebsocket *wsi, int enable)
2031 {
2032         struct libwebsocket_context *context = wsi->protocol->owning_server;
2033         int n;
2034
2035         for (n = 0; n < context->fds_count; n++)
2036                 if (context->fds[n].fd == wsi->sock) {
2037                         if (enable)
2038                                 context->fds[n].events |= POLLIN;
2039                         else
2040                                 context->fds[n].events &= ~POLLIN;
2041
2042                         return 0;
2043                 }
2044
2045         if (enable)
2046                 /* external POLL support via protocol 0 */
2047                 context->protocols[0].callback(context, wsi,
2048                         LWS_CALLBACK_SET_MODE_POLL_FD,
2049                         (void *)(long)wsi->sock, NULL, POLLIN);
2050         else
2051                 /* external POLL support via protocol 0 */
2052                 context->protocols[0].callback(context, wsi,
2053                         LWS_CALLBACK_CLEAR_MODE_POLL_FD,
2054                         (void *)(long)wsi->sock, NULL, POLLIN);
2055
2056
2057         fprintf(stderr, "libwebsocket_callback_on_writable "
2058                                                      "unable to find socket\n");
2059         return 1;
2060 }
2061
2062 /**
2063  * libwebsocket_canonical_hostname() - returns this host's hostname
2064  *
2065  * This is typically used by client code to fill in the host parameter
2066  * when making a client connection.  You can only call it after the context
2067  * has been created.
2068  *
2069  * @context:    Websocket context
2070  */
2071
2072
2073 extern const char *
2074 libwebsocket_canonical_hostname(struct libwebsocket_context *context)
2075 {
2076         return (const char *)context->canonical_hostname;
2077 }
2078
2079
2080 static void sigpipe_handler(int x)
2081 {
2082 }
2083
2084 #ifdef LWS_OPENSSL_SUPPORT
2085 static int
2086 OpenSSL_verify_callback(int preverify_ok, X509_STORE_CTX *x509_ctx)
2087 {
2088
2089         SSL *ssl;
2090         int n;
2091         struct libwebsocket_context *context;
2092
2093         ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
2094                 SSL_get_ex_data_X509_STORE_CTX_idx());
2095
2096         /*
2097          * !!! nasty openssl requires the index to come as a library-scope
2098          * static
2099          */
2100         context = SSL_get_ex_data(ssl, openssl_websocket_private_data_index);
2101
2102         n = context->protocols[0].callback(NULL, NULL,
2103                 LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION,
2104                                                    x509_ctx, ssl, preverify_ok);
2105
2106         /* convert return code from 0 = OK to 1 = OK */
2107
2108         if (!n)
2109                 n = 1;
2110         else
2111                 n = 0;
2112
2113         return n;
2114 }
2115 #endif
2116
2117
2118 /**
2119  * libwebsocket_create_context() - Create the websocket handler
2120  * @port:       Port to listen on... you can use 0 to suppress listening on
2121  *              any port, that's what you want if you are not running a
2122  *              websocket server at all but just using it as a client
2123  * @interf:  NULL to bind the listen socket to all interfaces, or the
2124  *              interface name, eg, "eth2"
2125  * @protocols:  Array of structures listing supported protocols and a protocol-
2126  *              specific callback for each one.  The list is ended with an
2127  *              entry that has a NULL callback pointer.
2128  *              It's not const because we write the owning_server member
2129  * @extensions: NULL or array of libwebsocket_extension structs listing the
2130  *              extensions this context supports
2131  * @ssl_cert_filepath:  If libwebsockets was compiled to use ssl, and you want
2132  *                      to listen using SSL, set to the filepath to fetch the
2133  *                      server cert from, otherwise NULL for unencrypted
2134  * @ssl_private_key_filepath: filepath to private key if wanting SSL mode,
2135  *                      else ignored
2136  * @gid:        group id to change to after setting listen socket, or -1.
2137  * @uid:        user id to change to after setting listen socket, or -1.
2138  * @options:    0, or LWS_SERVER_OPTION_DEFEAT_CLIENT_MASK
2139  *
2140  *      This function creates the listening socket and takes care
2141  *      of all initialization in one step.
2142  *
2143  *      After initialization, it returns a struct libwebsocket_context * that
2144  *      represents this server.  After calling, user code needs to take care
2145  *      of calling libwebsocket_service() with the context pointer to get the
2146  *      server's sockets serviced.  This can be done in the same process context
2147  *      or a forked process, or another thread,
2148  *
2149  *      The protocol callback functions are called for a handful of events
2150  *      including http requests coming in, websocket connections becoming
2151  *      established, and data arriving; it's also called periodically to allow
2152  *      async transmission.
2153  *
2154  *      HTTP requests are sent always to the FIRST protocol in @protocol, since
2155  *      at that time websocket protocol has not been negotiated.  Other
2156  *      protocols after the first one never see any HTTP callack activity.
2157  *
2158  *      The server created is a simple http server by default; part of the
2159  *      websocket standard is upgrading this http connection to a websocket one.
2160  *
2161  *      This allows the same server to provide files like scripts and favicon /
2162  *      images or whatever over http and dynamic data over websockets all in
2163  *      one place; they're all handled in the user callback.
2164  */
2165
2166 struct libwebsocket_context *
2167 libwebsocket_create_context(int port, const char *interf,
2168                                struct libwebsocket_protocols *protocols,
2169                                struct libwebsocket_extension *extensions,
2170                                const char *ssl_cert_filepath,
2171                                const char *ssl_private_key_filepath,
2172                                int gid, int uid, unsigned int options)
2173 {
2174         int n;
2175         int sockfd = 0;
2176         int fd;
2177         struct sockaddr_in serv_addr, cli_addr;
2178         int opt = 1;
2179         struct libwebsocket_context *context = NULL;
2180         unsigned int slen;
2181         char *p;
2182         char hostname[1024];
2183         struct hostent *he;
2184         struct libwebsocket *wsi;
2185
2186 #ifdef LWS_OPENSSL_SUPPORT
2187         SSL_METHOD *method;
2188         char ssl_err_buf[512];
2189 #endif
2190
2191 #ifdef _WIN32
2192         {
2193                 WORD wVersionRequested;
2194                 WSADATA wsaData;
2195                 int err;
2196
2197                 /* Use the MAKEWORD(lowbyte, highbyte) macro from Windef.h */
2198                 wVersionRequested = MAKEWORD(2, 2);
2199
2200                 err = WSAStartup(wVersionRequested, &wsaData);
2201                 if (err != 0) {
2202                         /* Tell the user that we could not find a usable */
2203                         /* Winsock DLL.                                  */
2204                         fprintf(stderr, "WSAStartup failed with error: %d\n",
2205                                                                            err);
2206                         return NULL;
2207                 }
2208         }
2209 #endif
2210
2211
2212         context = malloc(sizeof(struct libwebsocket_context));
2213         if (!context) {
2214                 fprintf(stderr, "No memory for websocket context\n");
2215                 return NULL;
2216         }
2217         context->protocols = protocols;
2218         context->listen_port = port;
2219         context->http_proxy_port = 0;
2220         context->http_proxy_address[0] = '\0';
2221         context->options = options;
2222         context->fds_count = 0;
2223         context->extensions = extensions;
2224
2225 #ifdef WIN32
2226         context->fd_random = 0;
2227 #else
2228         context->fd_random = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
2229         if (context->fd_random < 0) {
2230                 fprintf(stderr, "Unable to open random device %s %d\n",
2231                                     SYSTEM_RANDOM_FILEPATH, context->fd_random);
2232                 return NULL;
2233         }
2234 #endif
2235
2236 #ifdef LWS_OPENSSL_SUPPORT
2237         context->use_ssl = 0;
2238         context->ssl_ctx = NULL;
2239         context->ssl_client_ctx = NULL;
2240         openssl_websocket_private_data_index = 0;
2241 #endif
2242         /* find canonical hostname */
2243
2244         hostname[(sizeof hostname) - 1] = '\0';
2245         gethostname(hostname, (sizeof hostname) - 1);
2246         he = gethostbyname(hostname);
2247         if (he) {
2248                 strncpy(context->canonical_hostname, he->h_name,
2249                                         sizeof context->canonical_hostname - 1);
2250                 context->canonical_hostname[
2251                                 sizeof context->canonical_hostname - 1] = '\0';
2252         } else
2253                 strncpy(context->canonical_hostname, hostname,
2254                                         sizeof context->canonical_hostname - 1);
2255
2256         /* split the proxy ads:port if given */
2257
2258         p = getenv("http_proxy");
2259         if (p) {
2260                 strncpy(context->http_proxy_address, p,
2261                                         sizeof context->http_proxy_address - 1);
2262                 context->http_proxy_address[
2263                                  sizeof context->http_proxy_address - 1] = '\0';
2264
2265                 p = strchr(context->http_proxy_address, ':');
2266                 if (p == NULL) {
2267                         fprintf(stderr, "http_proxy needs to be ads:port\n");
2268                         return NULL;
2269                 }
2270                 *p = '\0';
2271                 context->http_proxy_port = atoi(p + 1);
2272
2273                 fprintf(stderr, "Using proxy %s:%u\n",
2274                                 context->http_proxy_address,
2275                                                       context->http_proxy_port);
2276         }
2277
2278         if (port) {
2279
2280 #ifdef LWS_OPENSSL_SUPPORT
2281                 context->use_ssl = ssl_cert_filepath != NULL &&
2282                                                ssl_private_key_filepath != NULL;
2283                 if (context->use_ssl)
2284                         fprintf(stderr, " Compiled with SSL support, "
2285                                                                   "using it\n");
2286                 else
2287                         fprintf(stderr, " Compiled with SSL support, "
2288                                                               "not using it\n");
2289
2290 #else
2291                 if (ssl_cert_filepath != NULL &&
2292                                              ssl_private_key_filepath != NULL) {
2293                         fprintf(stderr, " Not compiled for OpenSSl support!\n");
2294                         return NULL;
2295                 }
2296                 fprintf(stderr, " Compiled without SSL support, "
2297                                                        "serving unencrypted\n");
2298 #endif
2299         }
2300
2301         /* ignore SIGPIPE */
2302 #ifdef WIN32
2303 #else
2304         signal(SIGPIPE, sigpipe_handler);
2305 #endif
2306
2307
2308 #ifdef LWS_OPENSSL_SUPPORT
2309
2310         /* basic openssl init */
2311
2312         SSL_library_init();
2313
2314         OpenSSL_add_all_algorithms();
2315         SSL_load_error_strings();
2316
2317         openssl_websocket_private_data_index =
2318                 SSL_get_ex_new_index(0, "libwebsockets", NULL, NULL, NULL);
2319
2320         /*
2321          * Firefox insists on SSLv23 not SSLv3
2322          * Konq disables SSLv2 by default now, SSLv23 works
2323          */
2324
2325         method = (SSL_METHOD *)SSLv23_server_method();
2326         if (!method) {
2327                 fprintf(stderr, "problem creating ssl method: %s\n",
2328                         ERR_error_string(ERR_get_error(), ssl_err_buf));
2329                 return NULL;
2330         }
2331         context->ssl_ctx = SSL_CTX_new(method); /* create context */
2332         if (!context->ssl_ctx) {
2333                 fprintf(stderr, "problem creating ssl context: %s\n",
2334                         ERR_error_string(ERR_get_error(), ssl_err_buf));
2335                 return NULL;
2336         }
2337
2338         /* client context */
2339         if (port == CONTEXT_PORT_NO_LISTEN)
2340         {
2341                 method = (SSL_METHOD *)SSLv23_client_method();
2342                 if (!method) {
2343                         fprintf(stderr, "problem creating ssl method: %s\n",
2344                                 ERR_error_string(ERR_get_error(), ssl_err_buf));
2345                         return NULL;
2346                 }
2347                 /* create context */
2348                 context->ssl_client_ctx = SSL_CTX_new(method);
2349                 if (!context->ssl_client_ctx) {
2350                         fprintf(stderr, "problem creating ssl context: %s\n",
2351                                 ERR_error_string(ERR_get_error(), ssl_err_buf));
2352                         return NULL;
2353                 }
2354
2355                 /* openssl init for cert verification (for client sockets) */
2356
2357                 if (!SSL_CTX_load_verify_locations(
2358                                         context->ssl_client_ctx, NULL,
2359                                                       LWS_OPENSSL_CLIENT_CERTS))
2360                         fprintf(stderr,
2361                             "Unable to load SSL Client certs from %s "
2362                             "(set by --with-client-cert-dir= in configure) -- "
2363                                 " client ssl isn't going to work",
2364                                                       LWS_OPENSSL_CLIENT_CERTS);
2365
2366                 /*
2367                  * callback allowing user code to load extra verification certs
2368                  * helping the client to verify server identity
2369                  */
2370
2371                 context->protocols[0].callback(context, NULL,
2372                         LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS,
2373                         context->ssl_client_ctx, NULL, 0);
2374         }
2375         /* as a server, are we requiring clients to identify themselves? */
2376
2377         if (options & LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT) {
2378
2379                 /* absolutely require the client cert */
2380
2381                 SSL_CTX_set_verify(context->ssl_ctx,
2382                        SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
2383                                                        OpenSSL_verify_callback);
2384
2385                 /*
2386                  * give user code a chance to load certs into the server
2387                  * allowing it to verify incoming client certs
2388                  */
2389
2390                 context->protocols[0].callback(context, NULL,
2391                         LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS,
2392                                                      context->ssl_ctx, NULL, 0);
2393         }
2394
2395         if (context->use_ssl) {
2396
2397                 /* openssl init for server sockets */
2398
2399                 /* set the local certificate from CertFile */
2400                 n = SSL_CTX_use_certificate_file(context->ssl_ctx,
2401                                         ssl_cert_filepath, SSL_FILETYPE_PEM);
2402                 if (n != 1) {
2403                         fprintf(stderr, "problem getting cert '%s': %s\n",
2404                                 ssl_cert_filepath,
2405                                 ERR_error_string(ERR_get_error(), ssl_err_buf));
2406                         return NULL;
2407                 }
2408                 /* set the private key from KeyFile */
2409                 if (SSL_CTX_use_PrivateKey_file(context->ssl_ctx,
2410                              ssl_private_key_filepath, SSL_FILETYPE_PEM) != 1) {
2411                         fprintf(stderr, "ssl problem getting key '%s': %s\n",
2412                                                 ssl_private_key_filepath,
2413                                 ERR_error_string(ERR_get_error(), ssl_err_buf));
2414                         return NULL;
2415                 }
2416                 /* verify private key */
2417                 if (!SSL_CTX_check_private_key(context->ssl_ctx)) {
2418                         fprintf(stderr, "Private SSL key doesn't match cert\n");
2419                         return NULL;
2420                 }
2421
2422                 /* SSL is happy and has a cert it's content with */
2423         }
2424 #endif
2425
2426         /* selftest */
2427
2428         if (lws_b64_selftest())
2429                 return NULL;
2430
2431         /* fd hashtable init */
2432
2433         for (n = 0; n < FD_HASHTABLE_MODULUS; n++)
2434                 context->fd_hashtable[n].length = 0;
2435
2436         /* set up our external listening socket we serve on */
2437
2438         if (port) {
2439
2440                 sockfd = socket(AF_INET, SOCK_STREAM, 0);
2441                 if (sockfd < 0) {
2442                         fprintf(stderr, "ERROR opening socket");
2443                         return NULL;
2444                 }
2445
2446                 /* allow us to restart even if old sockets in TIME_WAIT */
2447                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
2448
2449
2450                 /* Disable Nagle */
2451                 opt = 1;
2452                 setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
2453
2454                 bzero((char *) &serv_addr, sizeof(serv_addr));
2455                 serv_addr.sin_family = AF_INET;
2456                 if (interf == NULL)
2457                         serv_addr.sin_addr.s_addr = INADDR_ANY;
2458                 else
2459                         interface_to_sa(interf, &serv_addr,
2460                                                 sizeof(serv_addr));
2461                 serv_addr.sin_port = htons(port);
2462
2463                 n = bind(sockfd, (struct sockaddr *) &serv_addr,
2464                                                              sizeof(serv_addr));
2465                 if (n < 0) {
2466                         fprintf(stderr, "ERROR on binding to port %d (%d %d)\n",
2467                                                                 port, n, errno);
2468                         return NULL;
2469                 }
2470
2471                 wsi = malloc(sizeof(struct libwebsocket));
2472                 memset(wsi, 0, sizeof (struct libwebsocket));
2473                 wsi->sock = sockfd;
2474                 wsi->count_active_extensions = 0;
2475                 wsi->mode = LWS_CONNMODE_SERVER_LISTENER;
2476                 insert_wsi(context, wsi);
2477
2478                 listen(sockfd, 5);
2479                 fprintf(stderr, " Listening on port %d\n", port);
2480
2481                 /* list in the internal poll array */
2482
2483                 context->fds[context->fds_count].fd = sockfd;
2484                 context->fds[context->fds_count++].events = POLLIN;
2485
2486                 /* external POLL support via protocol 0 */
2487                 context->protocols[0].callback(context, wsi,
2488                         LWS_CALLBACK_ADD_POLL_FD,
2489                         (void *)(long)sockfd, NULL, POLLIN);
2490
2491         }
2492
2493         /* drop any root privs for this process */
2494 #ifdef WIN32
2495 #else
2496         if (gid != -1)
2497                 if (setgid(gid))
2498                         fprintf(stderr, "setgid: %s\n", strerror(errno));
2499         if (uid != -1)
2500                 if (setuid(uid))
2501                         fprintf(stderr, "setuid: %s\n", strerror(errno));
2502 #endif
2503
2504         /* set up our internal broadcast trigger sockets per-protocol */
2505
2506         for (context->count_protocols = 0;
2507                         protocols[context->count_protocols].callback;
2508                                                    context->count_protocols++) {
2509                 protocols[context->count_protocols].owning_server = context;
2510                 protocols[context->count_protocols].protocol_index =
2511                                                        context->count_protocols;
2512
2513                 fd = socket(AF_INET, SOCK_STREAM, 0);
2514                 if (fd < 0) {
2515                         fprintf(stderr, "ERROR opening socket");
2516                         return NULL;
2517                 }
2518
2519                 /* allow us to restart even if old sockets in TIME_WAIT */
2520                 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
2521
2522                 bzero((char *) &serv_addr, sizeof(serv_addr));
2523                 serv_addr.sin_family = AF_INET;
2524                 serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
2525                 serv_addr.sin_port = 0; /* pick the port for us */
2526
2527                 n = bind(fd, (struct sockaddr *) &serv_addr, sizeof(serv_addr));
2528                 if (n < 0) {
2529                         fprintf(stderr, "ERROR on binding to port %d (%d %d)\n",
2530                                                                 port, n, errno);
2531                         return NULL;
2532                 }
2533
2534                 slen = sizeof cli_addr;
2535                 n = getsockname(fd, (struct sockaddr *)&cli_addr, &slen);
2536                 if (n < 0) {
2537                         fprintf(stderr, "getsockname failed\n");
2538                         return NULL;
2539                 }
2540                 protocols[context->count_protocols].broadcast_socket_port =
2541                                                        ntohs(cli_addr.sin_port);
2542                 listen(fd, 5);
2543
2544                 debug("  Protocol %s broadcast socket %d\n",
2545                                 protocols[context->count_protocols].name,
2546                                                       ntohs(cli_addr.sin_port));
2547
2548                 /* dummy wsi per broadcast proxy socket */
2549
2550                 wsi = malloc(sizeof(struct libwebsocket));
2551                 memset(wsi, 0, sizeof (struct libwebsocket));
2552                 wsi->sock = fd;
2553                 wsi->mode = LWS_CONNMODE_BROADCAST_PROXY_LISTENER;
2554                 wsi->count_active_extensions = 0;
2555                 /* note which protocol we are proxying */
2556                 wsi->protocol_index_for_broadcast_proxy =
2557                                                        context->count_protocols;
2558                 insert_wsi(context, wsi);
2559
2560                 /* list in internal poll array */
2561
2562                 context->fds[context->fds_count].fd = fd;
2563                 context->fds[context->fds_count].events = POLLIN;
2564                 context->fds[context->fds_count].revents = 0;
2565                 context->fds_count++;
2566
2567                 /* external POLL support via protocol 0 */
2568                 context->protocols[0].callback(context, wsi,
2569                         LWS_CALLBACK_ADD_POLL_FD,
2570                         (void *)(long)fd, NULL, POLLIN);
2571         }
2572
2573         return context;
2574 }
2575
2576
2577 #ifndef LWS_NO_FORK
2578
2579 /**
2580  * libwebsockets_fork_service_loop() - Optional helper function forks off
2581  *                                a process for the websocket server loop.
2582  *                              You don't have to use this but if not, you
2583  *                              have to make sure you are calling
2584  *                              libwebsocket_service periodically to service
2585  *                              the websocket traffic
2586  * @context:    server context returned by creation function
2587  */
2588
2589 int
2590 libwebsockets_fork_service_loop(struct libwebsocket_context *context)
2591 {
2592         int fd;
2593         struct sockaddr_in cli_addr;
2594         int n;
2595         int p;
2596
2597         n = fork();
2598         if (n < 0)
2599                 return n;
2600
2601         if (!n) {
2602
2603                 /* main process context */
2604
2605                 /*
2606                  * set up the proxy sockets to allow broadcast from
2607                  * service process context
2608                  */
2609
2610                 for (p = 0; p < context->count_protocols; p++) {
2611                         fd = socket(AF_INET, SOCK_STREAM, 0);
2612                         if (fd < 0) {
2613                                 fprintf(stderr, "Unable to create socket\n");
2614                                 return -1;
2615                         }
2616                         cli_addr.sin_family = AF_INET;
2617                         cli_addr.sin_port = htons(
2618                              context->protocols[p].broadcast_socket_port);
2619                         cli_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
2620                         n = connect(fd, (struct sockaddr *)&cli_addr,
2621                                                                sizeof cli_addr);
2622                         if (n < 0) {
2623                                 fprintf(stderr, "Unable to connect to "
2624                                                 "broadcast socket %d, %s\n",
2625                                                 n, strerror(errno));
2626                                 return -1;
2627                         }
2628
2629                         context->protocols[p].broadcast_socket_user_fd = fd;
2630                 }
2631
2632                 return 0;
2633         }
2634
2635         /* we want a SIGHUP when our parent goes down */
2636         prctl(PR_SET_PDEATHSIG, SIGHUP);
2637
2638         /* in this forked process, sit and service websocket connections */
2639
2640         while (1)
2641                 if (libwebsocket_service(context, 1000))
2642                         return -1;
2643
2644         return 0;
2645 }
2646
2647 #endif
2648
2649 /**
2650  * libwebsockets_get_protocol() - Returns a protocol pointer from a websocket
2651  *                                connection.
2652  * @wsi:        pointer to struct websocket you want to know the protocol of
2653  *
2654  *
2655  *      This is useful to get the protocol to broadcast back to from inside
2656  * the callback.
2657  */
2658
2659 const struct libwebsocket_protocols *
2660 libwebsockets_get_protocol(struct libwebsocket *wsi)
2661 {
2662         return wsi->protocol;
2663 }
2664
2665 /**
2666  * libwebsockets_broadcast() - Sends a buffer to the callback for all active
2667  *                                connections of the given protocol.
2668  * @protocol:   pointer to the protocol you will broadcast to all members of
2669  * @buf:  buffer containing the data to be broadcase.  NOTE: this has to be
2670  *              allocated with LWS_SEND_BUFFER_PRE_PADDING valid bytes before
2671  *              the pointer and LWS_SEND_BUFFER_POST_PADDING afterwards in the
2672  *              case you are calling this function from callback context.
2673  * @len:        length of payload data in buf, starting from buf.
2674  *
2675  *      This function allows bulk sending of a packet to every connection using
2676  * the given protocol.  It does not send the data directly; instead it calls
2677  * the callback with a reason type of LWS_CALLBACK_BROADCAST.  If the callback
2678  * wants to actually send the data for that connection, the callback itself
2679  * should call libwebsocket_write().
2680  *
2681  * libwebsockets_broadcast() can be called from another fork context without
2682  * having to take any care about data visibility between the processes, it'll
2683  * "just work".
2684  */
2685
2686
2687 int
2688 libwebsockets_broadcast(const struct libwebsocket_protocols *protocol,
2689                                                  unsigned char *buf, size_t len)
2690 {
2691         struct libwebsocket_context *context = protocol->owning_server;
2692         int n;
2693         int m;
2694         struct libwebsocket * wsi;
2695
2696         if (!protocol->broadcast_socket_user_fd) {
2697                 /*
2698                  * We are either running unforked / flat, or we are being
2699                  * called from poll thread context
2700                  * eg, from a callback.  In that case don't use sockets for
2701                  * broadcast IPC (since we can't open a socket connection to
2702                  * a socket listening on our own thread) but directly do the
2703                  * send action.
2704                  *
2705                  * Locking is not needed because we are by definition being
2706                  * called in the poll thread context and are serialized.
2707                  */
2708
2709                 for (n = 0; n < FD_HASHTABLE_MODULUS; n++) {
2710
2711                         for (m = 0; m < context->fd_hashtable[n].length; m++) {
2712
2713                                 wsi = context->fd_hashtable[n].wsi[m];
2714
2715                                 if (wsi->mode != LWS_CONNMODE_WS_SERVING)
2716                                         continue;
2717
2718                                 /*
2719                                  * never broadcast to
2720                                  * non-established connections
2721                                  */
2722                                 if (wsi->state != WSI_STATE_ESTABLISHED)
2723                                         continue;
2724
2725                                 /* only broadcast to guys using
2726                                  * requested protocol
2727                                  */
2728                                 if (wsi->protocol != protocol)
2729                                         continue;
2730
2731                                 wsi->protocol->callback(context, wsi,
2732                                          LWS_CALLBACK_BROADCAST,
2733                                          wsi->user_space,
2734                                          buf, len);
2735                         }
2736                 }
2737
2738                 return 0;
2739         }
2740
2741         /*
2742          * We're being called from a different process context than the server
2743          * loop.  Instead of broadcasting directly, we send our
2744          * payload on a socket to do the IPC; the server process will serialize
2745          * the broadcast action in its main poll() loop.
2746          *
2747          * There's one broadcast socket listening for each protocol supported
2748          * set up when the websocket server initializes
2749          */
2750
2751         n = send(protocol->broadcast_socket_user_fd, buf, len, MSG_NOSIGNAL);
2752
2753         return n;
2754 }
2755
2756 int
2757 libwebsocket_is_final_fragment(struct libwebsocket *wsi)
2758 {
2759         return wsi->final;
2760 }