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