lib/libwebsockets.c

   1 /*
   2  * libwebsockets - small server side websockets and web server implementation
   3  *
   4  * Copyright (C) 2010 Andy Green <andy@warmcat.com>
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Lesser General Public
   8  *  License as published by the Free Software Foundation:
   9  *  version 2.1 of the License.
  10  *
  11  *  This library is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Lesser General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Lesser General Public
  17  *  License along with this library; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19  *  MA  02110-1301  USA
  20  */
  21
  22 #include "private-libwebsockets.h"
  23
  24 #ifdef WIN32
  25
  26 #else
  27 #include <ifaddrs.h>
  28 #include <sys/un.h>
  29 #endif
  30
  31 #ifdef LWS_OPENSSL_SUPPORT
  32 int openssl_websocket_private_data_index;
  33 #endif
  34
  35 /*
  36  * In-place str to lower case
  37  */
  38
  39 static void
  40 strtolower(char *s)
  41 {
  42         while (*s) {
  43                 *s = tolower(*s);
  44                 s++;
  45         }
  46 }
  47
  48 /* file descriptor hash management */
  49
  50 struct libwebsocket *
  51 wsi_from_fd(struct libwebsocket_context *context, int fd)
  52 {
  53         int h = LWS_FD_HASH(fd);
  54         int n = 0;
  55
  56         for (n = 0; n < context->fd_hashtable[h].length; n++)
  57                 if (context->fd_hashtable[h].wsi[n]->sock == fd)
  58                         return context->fd_hashtable[h].wsi[n];
  59
  60         return NULL;
  61 }
  62
  63 int
  64 insert_wsi(struct libwebsocket_context *context, struct libwebsocket *wsi)
  65 {
  66         int h = LWS_FD_HASH(wsi->sock);
  67
  68         if (context->fd_hashtable[h].length == MAX_CLIENTS - 1) {
  69                 fprintf(stderr, "hash table overflow\n");
  70                 return 1;
  71         }
  72
  73         context->fd_hashtable[h].wsi[context->fd_hashtable[h].length++] = wsi;
  74
  75         return 0;
  76 }
  77
  78 int
  79 delete_from_fd(struct libwebsocket_context *context, int fd)
  80 {
  81         int h = LWS_FD_HASH(fd);
  82         int n = 0;
  83
  84         for (n = 0; n < context->fd_hashtable[h].length; n++)
  85                 if (context->fd_hashtable[h].wsi[n]->sock == fd) {
  86                         while (n < context->fd_hashtable[h].length) {
  87                                 context->fd_hashtable[h].wsi[n] =
  88                                             context->fd_hashtable[h].wsi[n + 1];
  89                                 n++;
  90                         }
  91                         context->fd_hashtable[h].length--;
  92
  93                         return 0;
  94                 }
  95
  96         fprintf(stderr, "Failed to find fd %d requested for "
  97                                                    "delete in hashtable\n", fd);
  98         return 1;
  99 }
 100
 101 #ifdef LWS_OPENSSL_SUPPORT
 102 static void
 103 libwebsockets_decode_ssl_error(void)
 104 {
 105         char buf[256];
 106         u_long err;
 107
 108         while ((err = ERR_get_error()) != 0) {
 109                 ERR_error_string_n(err, buf, sizeof(buf));
 110                 fprintf(stderr, "*** %s\n", buf);
 111         }
 112 }
 113 #endif
 114
 115
 116 static int
 117 interface_to_sa(const char* ifname, struct sockaddr_in *addr, size_t addrlen)
 118 {
 119         int rc = -1;
 120 #ifdef WIN32
 121         // TODO
 122 #else
 123         struct ifaddrs *ifr;
 124         struct ifaddrs *ifc;
 125         struct sockaddr_in *sin;
 126
 127         getifaddrs(&ifr);
 128         for (ifc = ifr; ifc != NULL; ifc = ifc->ifa_next) {
 129                 if (strcmp(ifc->ifa_name, ifname))
 130                         continue;
 131                 if (ifc->ifa_addr == NULL)
 132                         continue;
 133                 sin = (struct sockaddr_in *)ifc->ifa_addr;
 134                 if (sin->sin_family != AF_INET)
 135                         continue;
 136                 memcpy(addr, sin, addrlen);
 137                 rc = 0;
 138         }
 139
 140         freeifaddrs(ifr);
 141 #endif
 142         return rc;
 143 }
 144
 145 void
 146 libwebsocket_close_and_free_session(struct libwebsocket_context *context,
 147                          struct libwebsocket *wsi, enum lws_close_status reason)
 148 {
 149         int n;
 150         int old_state;
 151         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 2 +
 152                                                   LWS_SEND_BUFFER_POST_PADDING];
 153         int ret;
 154         int m;
 155         struct lws_tokens eff_buf;
 156         struct libwebsocket_extension *ext;
 157
 158         if (!wsi)
 159                 return;
 160
 161         old_state = wsi->state;
 162
 163         if (old_state == WSI_STATE_DEAD_SOCKET)
 164                 return;
 165
 166         wsi->close_reason = reason;
 167
 168         /*
 169          * are his extensions okay with him closing?  Eg he might be a mux
 170          * parent and just his ch1 aspect is closing?
 171          */
 172
 173
 174         for (n = 0; n < wsi->count_active_extensions; n++) {
 175                 if (!wsi->active_extensions[n]->callback)
 176                         continue;
 177
 178                 m = wsi->active_extensions[n]->callback(context,
 179                         wsi->active_extensions[n], wsi,
 180                         LWS_EXT_CALLBACK_CHECK_OK_TO_REALLY_CLOSE,
 181                                        wsi->active_extensions_user[n], NULL, 0);
 182
 183                 /*
 184                  * if somebody vetoed actually closing him at this time....
 185                  * up to the extension to track the attempted close, let's
 186                  * just bail
 187                  */
 188
 189                 if (m) {
 190                         debug("extension vetoed close\n");
 191                         return;
 192                 }
 193         }
 194
 195
 196
 197         /*
 198          * flush any tx pending from extensions, since we may send close packet
 199          * if there are problems with send, just nuke the connection
 200          */
 201
 202         ret = 1;
 203         while (ret == 1) {
 204
 205                 /* default to nobody has more to spill */
 206
 207                 ret = 0;
 208                 eff_buf.token = NULL;
 209                 eff_buf.token_len = 0;
 210
 211                 /* show every extension the new incoming data */
 212
 213                 for (n = 0; n < wsi->count_active_extensions; n++) {
 214                         m = wsi->active_extensions[n]->callback(
 215                                         wsi->protocol->owning_server,
 216                                         wsi->active_extensions[n], wsi,
 217                                         LWS_EXT_CALLBACK_FLUSH_PENDING_TX,
 218                                    wsi->active_extensions_user[n], &eff_buf, 0);
 219                         if (m < 0) {
 220                                 fprintf(stderr, "Extension reports "
 221                                                                "fatal error\n");
 222                                 goto just_kill_connection;
 223                         }
 224                         if (m)
 225                                 /*
 226                                  * at least one extension told us he has more
 227                                  * to spill, so we will go around again after
 228                                  */
 229                                 ret = 1;
 230                 }
 231
 232                 /* assuming they left us something to send, send it */
 233
 234                 if (eff_buf.token_len)
 235                         if (lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
 236                                                              eff_buf.token_len))
 237                                 goto just_kill_connection;
 238         }
 239
 240         /*
 241          * signal we are closing, libsocket_write will
 242          * add any necessary version-specific stuff.  If the write fails,
 243          * no worries we are closing anyway.  If we didn't initiate this
 244          * close, then our state has been changed to
 245          * WSI_STATE_RETURNED_CLOSE_ALREADY and we will skip this.
 246          *
 247          * Likewise if it's a second call to close this connection after we
 248          * sent the close indication to the peer already, we are in state
 249          * WSI_STATE_AWAITING_CLOSE_ACK and will skip doing this a second time.
 250          */
 251
 252         if (old_state == WSI_STATE_ESTABLISHED &&
 253                                           reason != LWS_CLOSE_STATUS_NOSTATUS) {
 254
 255                 debug("sending close indication...\n");
 256
 257                 n = libwebsocket_write(wsi, &buf[LWS_SEND_BUFFER_PRE_PADDING],
 258                                                             0, LWS_WRITE_CLOSE);
 259                 if (!n) {
 260                         /*
 261                          * we have sent a nice protocol level indication we
 262                          * now wish to close, we should not send anything more
 263                          */
 264
 265                         wsi->state = WSI_STATE_AWAITING_CLOSE_ACK;
 266
 267                         /* and we should wait for a reply for a bit */
 268
 269                         libwebsocket_set_timeout(wsi,
 270                                                   PENDING_TIMEOUT_CLOSE_ACK, 5);
 271
 272                         debug("sent close indication, awaiting ack\n");
 273
 274                         return;
 275                 }
 276
 277                 /* else, the send failed and we should just hang up */
 278         }
 279
 280 just_kill_connection:
 281
 282         debug("libwebsocket_close_and_free_session: just_kill_connection\n");
 283
 284         /*
 285          * we won't be servicing or receiving anything further from this guy
 286          * remove this fd from wsi mapping hashtable
 287          */
 288
 289         if (wsi->sock)
 290                 delete_from_fd(context, wsi->sock);
 291
 292         /* delete it from the internal poll list if still present */
 293
 294         for (n = 0; n < context->fds_count; n++) {
 295                 if (context->fds[n].fd != wsi->sock)
 296                         continue;
 297                 while (n < context->fds_count - 1) {
 298                         context->fds[n] = context->fds[n + 1];
 299                         n++;
 300                 }
 301                 context->fds_count--;
 302                 /* we only have to deal with one */
 303                 n = context->fds_count;
 304         }
 305
 306         /* remove also from external POLL support via protocol 0 */
 307         if (wsi->sock)
 308                 context->protocols[0].callback(context, wsi,
 309                     LWS_CALLBACK_DEL_POLL_FD, (void *)(long)wsi->sock, NULL, 0);
 310
 311         wsi->state = WSI_STATE_DEAD_SOCKET;
 312
 313         /* tell the user it's all over for this guy */
 314
 315         if (wsi->protocol && wsi->protocol->callback &&
 316                                 ((old_state == WSI_STATE_ESTABLISHED) ||
 317                                  (old_state == WSI_STATE_RETURNED_CLOSE_ALREADY) ||
 318                                  (old_state == WSI_STATE_AWAITING_CLOSE_ACK))) {
 319                 debug("calling back CLOSED\n");
 320                 wsi->protocol->callback(context, wsi, LWS_CALLBACK_CLOSED,
 321                                                       wsi->user_space, NULL, 0);
 322         } else
 323                 debug("not calling back closed due to old_state=%d\n",
 324                                                                      old_state);
 325
 326
 327         /* deallocate any active extension contexts */
 328
 329         for (n = 0; n < wsi->count_active_extensions; n++) {
 330                 if (!wsi->active_extensions[n]->callback)
 331                         continue;
 332
 333                 wsi->active_extensions[n]->callback(context,
 334                         wsi->active_extensions[n], wsi,
 335                                 LWS_EXT_CALLBACK_DESTROY,
 336                                        wsi->active_extensions_user[n], NULL, 0);
 337
 338                 free(wsi->active_extensions_user[n]);
 339         }
 340
 341         /*
 342          * inform all extensions in case they tracked this guy out of band
 343          * even though not active on him specifically
 344          */
 345
 346         ext = context->extensions;
 347         while (ext && ext->callback) {
 348                 ext->callback(context, ext, wsi,
 349                                 LWS_EXT_CALLBACK_DESTROY_ANY_WSI_CLOSING,
 350                                        NULL, NULL, 0);
 351                 ext++;
 352         }
 353
 354         /* free up his parsing allocations */
 355
 356         for (n = 0; n < WSI_TOKEN_COUNT; n++)
 357                 if (wsi->utf8_token[n].token)
 358                         free(wsi->utf8_token[n].token);
 359
 360         if (wsi->c_address)
 361                 free(wsi->c_address);
 362
 363 /*      fprintf(stderr, "closing fd=%d\n", wsi->sock); */
 364
 365 #ifdef LWS_OPENSSL_SUPPORT
 366         if (wsi->ssl) {
 367                 n = SSL_get_fd(wsi->ssl);
 368                 SSL_shutdown(wsi->ssl);
 369 #ifdef WIN32
 370                 closesocket(n);
 371 #else
 372                 close(n);
 373 #endif
 374                 SSL_free(wsi->ssl);
 375         } else {
 376 #endif
 377                 shutdown(wsi->sock, SHUT_RDWR);
 378 #ifdef WIN32
 379                 if (wsi->sock)
 380                         closesocket(wsi->sock);
 381 #else
 382                 if (wsi->sock)
 383                         close(wsi->sock);
 384 #endif
 385 #ifdef LWS_OPENSSL_SUPPORT
 386         }
 387 #endif
 388         if (wsi->user_space)
 389                 free(wsi->user_space);
 390
 391         free(wsi);
 392 }
 393
 394 /**
 395  * libwebsockets_hangup_on_client() - Server calls to terminate client
 396  *                                      connection
 397  * @context:    libwebsockets context
 398  * @fd:         Connection socket descriptor
 399  */
 400
 401 void
 402 libwebsockets_hangup_on_client(struct libwebsocket_context *context, int fd)
 403 {
 404         struct libwebsocket *wsi = wsi_from_fd(context, fd);
 405
 406         if (wsi == NULL)
 407                 return;
 408
 409         libwebsocket_close_and_free_session(context, wsi,
 410                                                      LWS_CLOSE_STATUS_NOSTATUS);
 411 }
 412
 413
 414 /**
 415  * libwebsockets_get_peer_addresses() - Get client address information
 416  * @fd:         Connection socket descriptor
 417  * @name:       Buffer to take client address name
 418  * @name_len:   Length of client address name buffer
 419  * @rip:        Buffer to take client address IP qotted quad
 420  * @rip_len:    Length of client address IP buffer
 421  *
 422  *      This function fills in @name and @rip with the name and IP of
 423  *      the client connected with socket descriptor @fd.  Names may be
 424  *      truncated if there is not enough room.  If either cannot be
 425  *      determined, they will be returned as valid zero-length strings.
 426  */
 427
 428 void
 429 libwebsockets_get_peer_addresses(int fd, char *name, int name_len,
 430                                         char *rip, int rip_len)
 431 {
 432         unsigned int len;
 433         struct sockaddr_in sin;
 434         struct hostent *host;
 435         struct hostent *host1;
 436         char ip[128];
 437         unsigned char *p;
 438         int n;
 439         struct sockaddr_un *un;
 440
 441         rip[0] = '\0';
 442         name[0] = '\0';
 443
 444         len = sizeof sin;
 445         if (getpeername(fd, (struct sockaddr *) &sin, &len) < 0) {
 446                 perror("getpeername");
 447                 return;
 448         }
 449
 450         host = gethostbyaddr((char *) &sin.sin_addr, sizeof sin.sin_addr,
 451                                                                        AF_INET);
 452         if (host == NULL) {
 453                 perror("gethostbyaddr");
 454                 return;
 455         }
 456
 457         strncpy(name, host->h_name, name_len);
 458         name[name_len - 1] = '\0';
 459
 460         host1 = gethostbyname(host->h_name);
 461         if (host1 == NULL)
 462                 return;
 463         p = (unsigned char *)host1;
 464         n = 0;
 465         while (p != NULL) {
 466                 p = (unsigned char *)host1->h_addr_list[n++];
 467                 if (p == NULL)
 468                         continue;
 469                 if ((host1->h_addrtype != AF_INET)
 470 #ifdef AF_LOCAL
 471                         && (host1->h_addrtype != AF_LOCAL)
 472 #endif
 473                         )
 474                         continue;
 475
 476                 if (host1->h_addrtype == AF_INET)
 477                         sprintf(ip, "%u.%u.%u.%u", p[0], p[1], p[2], p[3]);
 478 #ifdef AF_LOCAL
 479                 else {
 480                         un = (struct sockaddr_un *)p;
 481                         strncpy(ip, un->sun_path, sizeof(ip) -1);
 482                         ip[sizeof(ip) - 1] = '\0';
 483                 }
 484 #endif
 485                 p = NULL;
 486                 strncpy(rip, ip, rip_len);
 487                 rip[rip_len - 1] = '\0';
 488         }
 489 }
 490
 491 int libwebsockets_get_random(struct libwebsocket_context *context,
 492                                                              void *buf, int len)
 493 {
 494         int n;
 495         char *p = buf;
 496
 497 #ifdef WIN32
 498         for (n = 0; n < len; n++)
 499                 p[n] = (unsigned char)rand();
 500 #else
 501         n = read(context->fd_random, p, len);
 502 #endif
 503
 504         return n;
 505 }
 506
 507 unsigned char *
 508 libwebsockets_SHA1(const unsigned char *d, size_t n, unsigned char *md)
 509 {
 510         return SHA1(d, n, md);
 511 }
 512
 513 void libwebsockets_00_spaceout(char *key, int spaces, int seed)
 514 {
 515         char *p;
 516
 517         key++;
 518         while (spaces--) {
 519                 if (*key && (seed & 1))
 520                         key++;
 521                 seed >>= 1;
 522
 523                 p = key + strlen(key);
 524                 while (p >= key) {
 525                         p[1] = p[0];
 526                         p--;
 527                 }
 528                 *key++ = ' ';
 529         }
 530 }
 531
 532 void libwebsockets_00_spam(char *key, int count, int seed)
 533 {
 534         char *p;
 535
 536         key++;
 537         while (count--) {
 538
 539                 if (*key && (seed & 1))
 540                         key++;
 541                 seed >>= 1;
 542
 543                 p = key + strlen(key);
 544                 while (p >= key) {
 545                         p[1] = p[0];
 546                         p--;
 547                 }
 548                 *key++ = 0x21 + ((seed & 0xffff) % 15);
 549                 /* 4 would use it up too fast.. not like it matters */
 550                 seed >>= 1;
 551         }
 552 }
 553
 554 int lws_send_pipe_choked(struct libwebsocket *wsi)
 555 {
 556         struct pollfd fds;
 557
 558         fds.fd = wsi->sock;
 559         fds.events = POLLOUT;
 560         fds.revents = 0;
 561
 562         if (poll(&fds, 1, 0) != 1)
 563                 return 1;
 564
 565         if ((fds.revents & POLLOUT) == 0)
 566                 return 1;
 567
 568         /* okay to send another packet without blocking */
 569
 570         return 0;
 571 }
 572
 573 int
 574 lws_handle_POLLOUT_event(struct libwebsocket_context *context,
 575                                 struct libwebsocket *wsi, struct pollfd *pollfd)
 576 {
 577         struct lws_tokens eff_buf;
 578         int n;
 579         int ret;
 580         int m;
 581         int handled = 0;
 582
 583         for (n = 0; n < wsi->count_active_extensions; n++) {
 584                 if (!wsi->active_extensions[n]->callback)
 585                         continue;
 586
 587                 m = wsi->active_extensions[n]->callback(context,
 588                         wsi->active_extensions[n], wsi,
 589                         LWS_EXT_CALLBACK_IS_WRITEABLE,
 590                                        wsi->active_extensions_user[n], NULL, 0);
 591                 if (m > handled)
 592                         handled = m;
 593         }
 594
 595         if (handled == 1)
 596                 goto notify_action;
 597
 598         if (!wsi->extension_data_pending || handled == 2)
 599                 goto user_service;
 600
 601         /*
 602          * check in on the active extensions, see if they
 603          * had pending stuff to spill... they need to get the
 604          * first look-in otherwise sequence will be disordered
 605          *
 606          * NULL, zero-length eff_buf means just spill pending
 607          */
 608
 609         ret = 1;
 610         while (ret == 1) {
 611
 612                 /* default to nobody has more to spill */
 613
 614                 ret = 0;
 615                 eff_buf.token = NULL;
 616                 eff_buf.token_len = 0;
 617
 618                 /* give every extension a chance to spill */
 619
 620                 for (n = 0; n < wsi->count_active_extensions; n++) {
 621                         m = wsi->active_extensions[n]->callback(
 622                                 wsi->protocol->owning_server,
 623                                 wsi->active_extensions[n], wsi,
 624                                         LWS_EXT_CALLBACK_PACKET_TX_PRESEND,
 625                                    wsi->active_extensions_user[n], &eff_buf, 0);
 626                         if (m < 0) {
 627                                 fprintf(stderr, "extension reports fatal error\n");
 628                                 return -1;
 629                         }
 630                         if (m)
 631                                 /*
 632                                  * at least one extension told us he has more
 633                                  * to spill, so we will go around again after
 634                                  */
 635                                 ret = 1;
 636                 }
 637
 638                 /* assuming they gave us something to send, send it */
 639
 640                 if (eff_buf.token_len) {
 641                         if (lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
 642                                                              eff_buf.token_len))
 643                                 return -1;
 644                 } else
 645                         continue;
 646
 647                 /* no extension has more to spill */
 648
 649                 if (!ret)
 650                         continue;
 651
 652                 /*
 653                  * There's more to spill from an extension, but we just sent
 654                  * something... did that leave the pipe choked?
 655                  */
 656
 657                 if (!lws_send_pipe_choked(wsi))
 658                         /* no we could add more */
 659                         continue;
 660
 661                 debug("choked in POLLOUT service\n");
 662
 663                 /*
 664                  * Yes, he's choked.  Leave the POLLOUT masked on so we will
 665                  * come back here when he is unchoked.  Don't call the user
 666                  * callback to enforce ordering of spilling, he'll get called
 667                  * when we come back here and there's nothing more to spill.
 668                  */
 669
 670                 return 0;
 671         }
 672
 673         wsi->extension_data_pending = 0;
 674
 675 user_service:
 676         /* one shot */
 677
 678         if (pollfd) {
 679                 pollfd->events &= ~POLLOUT;
 680
 681                 /* external POLL support via protocol 0 */
 682                 context->protocols[0].callback(context, wsi,
 683                         LWS_CALLBACK_CLEAR_MODE_POLL_FD,
 684                         (void *)(long)wsi->sock, NULL, POLLOUT);
 685         }
 686
 687 notify_action:
 688
 689         if (wsi->mode == LWS_CONNMODE_WS_CLIENT)
 690                 n = LWS_CALLBACK_CLIENT_WRITEABLE;
 691         else
 692                 n = LWS_CALLBACK_SERVER_WRITEABLE;
 693
 694         wsi->protocol->callback(context, wsi, n, wsi->user_space, NULL, 0);
 695
 696         return 0;
 697 }
 698
 699
 700
 701 void
 702 libwebsocket_service_timeout_check(struct libwebsocket_context *context,
 703                                      struct libwebsocket *wsi, unsigned int sec)
 704 {
 705         int n;
 706
 707         /*
 708          * if extensions want in on it (eg, we are a mux parent)
 709          * give them a chance to service child timeouts
 710          */
 711
 712         for (n = 0; n < wsi->count_active_extensions; n++)
 713                 wsi->active_extensions[n]->callback(
 714                                     context, wsi->active_extensions[n],
 715                                     wsi, LWS_EXT_CALLBACK_1HZ,
 716                                     wsi->active_extensions_user[n], NULL, sec);
 717
 718         if (!wsi->pending_timeout)
 719                 return;
 720
 721         /*
 722          * if we went beyond the allowed time, kill the
 723          * connection
 724          */
 725
 726         if (sec > wsi->pending_timeout_limit) {
 727                 debug("TIMEDOUT WAITING\n");
 728                 libwebsocket_close_and_free_session(context,
 729                                 wsi, LWS_CLOSE_STATUS_NOSTATUS);
 730         }
 731 }
 732
 733 struct libwebsocket *
 734 libwebsocket_create_new_server_wsi(struct libwebsocket_context *context)
 735 {
 736         struct libwebsocket *new_wsi;
 737         int n;
 738
 739         new_wsi = malloc(sizeof(struct libwebsocket));
 740         if (new_wsi == NULL) {
 741                 fprintf(stderr, "Out of memory for new connection\n");
 742                 return NULL;
 743         }
 744
 745         memset(new_wsi, 0, sizeof (struct libwebsocket));
 746         new_wsi->count_active_extensions = 0;
 747         new_wsi->pending_timeout = NO_PENDING_TIMEOUT;
 748
 749         /* intialize the instance struct */
 750
 751         new_wsi->state = WSI_STATE_HTTP;
 752         new_wsi->name_buffer_pos = 0;
 753         new_wsi->mode = LWS_CONNMODE_WS_SERVING;
 754
 755         for (n = 0; n < WSI_TOKEN_COUNT; n++) {
 756                 new_wsi->utf8_token[n].token = NULL;
 757                 new_wsi->utf8_token[n].token_len = 0;
 758         }
 759
 760         /*
 761          * these can only be set once the protocol is known
 762          * we set an unestablished connection's protocol pointer
 763          * to the start of the supported list, so it can look
 764          * for matching ones during the handshake
 765          */
 766         new_wsi->protocol = context->protocols;
 767         new_wsi->user_space = NULL;
 768
 769         /*
 770          * Default protocol is 76 / 00
 771          * After 76, there's a header specified to inform which
 772          * draft the client wants, when that's seen we modify
 773          * the individual connection's spec revision accordingly
 774          */
 775         new_wsi->ietf_spec_revision = 0;
 776
 777         return new_wsi;
 778 }
 779
 780 char *
 781 libwebsockets_generate_client_handshake(struct libwebsocket_context *context,
 782                 struct libwebsocket *wsi, char *pkt)
 783 {
 784         char hash[20];
 785         char *p = pkt;
 786         int n;
 787         struct libwebsocket_extension *ext;
 788         struct libwebsocket_extension *ext1;
 789         int ext_count = 0;
 790         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 1 + MAX_BROADCAST_PAYLOAD +
 791                                                   LWS_SEND_BUFFER_POST_PADDING];
 792         static const char magic_websocket_guid[] =
 793                                          "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 794
 795         /*
 796          * create the random key
 797          */
 798
 799         n = libwebsockets_get_random(context, hash, 16);
 800         if (n != 16) {
 801                 fprintf(stderr, "Unable to read from random dev %s\n",
 802                                                 SYSTEM_RANDOM_FILEPATH);
 803                 free(wsi->c_path);
 804                 free(wsi->c_host);
 805                 if (wsi->c_origin)
 806                         free(wsi->c_origin);
 807                 if (wsi->c_protocol)
 808                         free(wsi->c_protocol);
 809                 libwebsocket_close_and_free_session(context, wsi,
 810                                              LWS_CLOSE_STATUS_NOSTATUS);
 811                 return NULL;
 812         }
 813
 814         lws_b64_encode_string(hash, 16, wsi->key_b64,
 815                                                    sizeof wsi->key_b64);
 816
 817         /*
 818          * 00 example client handshake
 819          *
 820          * GET /socket.io/websocket HTTP/1.1
 821          * Upgrade: WebSocket
 822          * Connection: Upgrade
 823          * Host: 127.0.0.1:9999
 824          * Origin: http://127.0.0.1
 825          * Sec-WebSocket-Key1: 1 0 2#0W 9 89 7  92 ^
 826          * Sec-WebSocket-Key2: 7 7Y 4328 B2v[8(z1
 827          * Cookie: socketio=websocket
 828          *
 829          * (Á®Ä0¶†≥
 830          *
 831          * 04 example client handshake
 832          *
 833          * GET /chat HTTP/1.1
 834          * Host: server.example.com
 835          * Upgrade: websocket
 836          * Connection: Upgrade
 837          * Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
 838          * Sec-WebSocket-Origin: http://example.com
 839          * Sec-WebSocket-Protocol: chat, superchat
 840          * Sec-WebSocket-Version: 4
 841          */
 842
 843         p += sprintf(p, "GET %s HTTP/1.1\x0d\x0a", wsi->c_path);
 844
 845         if (wsi->ietf_spec_revision == 0) {
 846                 unsigned char spaces_1, spaces_2;
 847                 unsigned int max_1, max_2;
 848                 unsigned int num_1, num_2;
 849                 unsigned long product_1, product_2;
 850                 char key_1[40];
 851                 char key_2[40];
 852                 unsigned int seed;
 853                 unsigned int count;
 854                 char challenge[16];
 855
 856                 libwebsockets_get_random(context, &spaces_1,
 857                                                           sizeof(char));
 858                 libwebsockets_get_random(context, &spaces_2,
 859                                                           sizeof(char));
 860
 861                 spaces_1 = (spaces_1 % 12) + 1;
 862                 spaces_2 = (spaces_2 % 12) + 1;
 863
 864                 max_1 = 4294967295 / spaces_1;
 865                 max_2 = 4294967295 / spaces_2;
 866
 867                 libwebsockets_get_random(context, &num_1, sizeof(int));
 868                 libwebsockets_get_random(context, &num_2, sizeof(int));
 869
 870                 num_1 = (num_1 % max_1);
 871                 num_2 = (num_2 % max_2);
 872
 873                 challenge[0] = num_1 >> 24;
 874                 challenge[1] = num_1 >> 16;
 875                 challenge[2] = num_1 >> 8;
 876                 challenge[3] = num_1;
 877                 challenge[4] = num_2 >> 24;
 878                 challenge[5] = num_2 >> 16;
 879                 challenge[6] = num_2 >> 8;
 880                 challenge[7] = num_2;
 881
 882                 product_1 = num_1 * spaces_1;
 883                 product_2 = num_2 * spaces_2;
 884
 885                 sprintf(key_1, "%lu", product_1);
 886                 sprintf(key_2, "%lu", product_2);
 887
 888                 libwebsockets_get_random(context, &seed, sizeof(int));
 889                 libwebsockets_get_random(context, &count, sizeof(int));
 890
 891                 libwebsockets_00_spam(key_1, (count % 12) + 1, seed);
 892
 893                 libwebsockets_get_random(context, &seed, sizeof(int));
 894                 libwebsockets_get_random(context, &count, sizeof(int));
 895
 896                 libwebsockets_00_spam(key_2, (count % 12) + 1, seed);
 897
 898                 libwebsockets_get_random(context, &seed, sizeof(int));
 899
 900                 libwebsockets_00_spaceout(key_1, spaces_1, seed);
 901                 libwebsockets_00_spaceout(key_2, spaces_2, seed >> 16);
 902
 903                 p += sprintf(p, "Upgrade: WebSocket\x0d\x0a"
 904                         "Connection: Upgrade\x0d\x0aHost: %s\x0d\x0a",
 905                         wsi->c_host);
 906                 if (wsi->c_origin)
 907                         p += sprintf(p, "Origin: %s\x0d\x0a",
 908                         wsi->c_origin);
 909
 910                 if (wsi->c_protocol)
 911                         p += sprintf(p, "Sec-WebSocket-Protocol: %s"
 912                                          "\x0d\x0a", wsi->c_protocol);
 913
 914                 p += sprintf(p, "Sec-WebSocket-Key1: %s\x0d\x0a",
 915                         key_1);
 916                 p += sprintf(p, "Sec-WebSocket-Key2: %s\x0d\x0a",
 917                         key_2);
 918
 919                 /* give userland a chance to append, eg, cookies */
 920
 921                 context->protocols[0].callback(context, wsi,
 922                         LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER,
 923                                 NULL, &p, (pkt + sizeof(pkt)) - p - 12);
 924
 925                 p += sprintf(p, "\x0d\x0a");
 926
 927                 if (libwebsockets_get_random(context, p, 8) != 8)
 928                         return NULL;
 929                 memcpy(&challenge[8], p, 8);
 930                 p += 8;
 931
 932                 /* precompute what we want to see from the server */
 933
 934                 MD5((unsigned char *)challenge, 16,
 935                    (unsigned char *)wsi->initial_handshake_hash_base64);
 936
 937                 goto issue_hdr;
 938         }
 939
 940         p += sprintf(p, "Host: %s\x0d\x0a", wsi->c_host);
 941         p += sprintf(p, "Upgrade: websocket\x0d\x0a");
 942         p += sprintf(p, "Connection: Upgrade\x0d\x0a"
 943                                 "Sec-WebSocket-Key: ");
 944         strcpy(p, wsi->key_b64);
 945         p += strlen(wsi->key_b64);
 946         p += sprintf(p, "\x0d\x0a");
 947         if (wsi->c_origin)
 948                 p += sprintf(p, "Sec-WebSocket-Origin: %s\x0d\x0a",
 949                                                          wsi->c_origin);
 950         if (wsi->c_protocol)
 951                 p += sprintf(p, "Sec-WebSocket-Protocol: %s\x0d\x0a",
 952                                                        wsi->c_protocol);
 953
 954         /* tell the server what extensions we could support */
 955
 956         p += sprintf(p, "Sec-WebSocket-Extensions: ");
 957
 958         ext =context->extensions;
 959         while (ext && ext->callback) {
 960
 961                 n = 0;
 962                 ext1 = context->extensions;
 963                 while (ext1 && ext1->callback) {
 964
 965                         n |= ext1->callback(context, ext1, wsi,
 966                                 LWS_EXT_CALLBACK_CHECK_OK_TO_PROPOSE_EXTENSION,
 967                                         NULL, (char *)ext->name, 0);
 968
 969                         ext1++;
 970                 }
 971
 972                 if (n) {
 973
 974                         /* an extension vetos us */
 975                         debug("ext %s vetoed\n", (char *)ext->name);
 976                         ext++;
 977                         continue;
 978                 }
 979
 980                 n = context->protocols[0].callback(context, wsi,
 981                         LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED,
 982                                 wsi->user_space, (char *)ext->name, 0);
 983
 984                 /*
 985                  * zero return from callback means
 986                  * go ahead and allow the extension,
 987                  * it's what we get if the callback is
 988                  * unhandled
 989                  */
 990
 991                 if (n) {
 992                         ext++;
 993                         continue;
 994                 }
 995
 996                 /* apply it */
 997
 998                 if (ext_count)
 999                         *p++ = ',';
1000                 p += sprintf(p, "%s", ext->name);
1001                 ext_count++;
1002
1003                 ext++;
1004         }
1005
1006         p += sprintf(p, "\x0d\x0a");
1007
1008         if (wsi->ietf_spec_revision)
1009                 p += sprintf(p, "Sec-WebSocket-Version: %d\x0d\x0a",
1010                                                wsi->ietf_spec_revision);
1011
1012         /* give userland a chance to append, eg, cookies */
1013
1014         context->protocols[0].callback(context, wsi,
1015                 LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER,
1016                 NULL, &p, (pkt + sizeof(pkt)) - p - 12);
1017
1018         p += sprintf(p, "\x0d\x0a");
1019
1020         /* prepare the expected server accept response */
1021
1022         strcpy((char *)buf, wsi->key_b64);
1023         strcpy((char *)&buf[strlen((char *)buf)], magic_websocket_guid);
1024
1025         SHA1(buf, strlen((char *)buf), (unsigned char *)hash);
1026
1027         lws_b64_encode_string(hash, 20,
1028                         wsi->initial_handshake_hash_base64,
1029                              sizeof wsi->initial_handshake_hash_base64);
1030
1031 issue_hdr:
1032
1033 //      puts(pkt);
1034
1035         /* done with these now */
1036
1037         free(wsi->c_path);
1038         free(wsi->c_host);
1039         if (wsi->c_origin)
1040                 free(wsi->c_origin);
1041
1042         return p;
1043 }
1044
1045 int
1046 lws_client_interpret_server_handshake(struct libwebsocket_context *context,
1047                 struct libwebsocket *wsi)
1048 {
1049         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 1 + MAX_BROADCAST_PAYLOAD +
1050                                                   LWS_SEND_BUFFER_POST_PADDING];
1051         char pkt[1024];
1052         char *p = &pkt[0];
1053         const char *pc;
1054         const char *c;
1055         int more = 1;
1056         int okay = 0;
1057         char ext_name[128];
1058         struct libwebsocket_extension *ext;
1059         void *v;
1060         int len = 0;
1061         int n;
1062         static const char magic_websocket_04_masking_guid[] =
1063                                          "61AC5F19-FBBA-4540-B96F-6561F1AB40A8";
1064
1065         /*
1066          * 00 / 76 -->
1067          *
1068          * HTTP/1.1 101 WebSocket Protocol Handshake
1069          * Upgrade: WebSocket
1070          * Connection: Upgrade
1071          * Sec-WebSocket-Origin: http://127.0.0.1
1072          * Sec-WebSocket-Location: ws://127.0.0.1:9999/socket.io/websocket
1073          *
1074          * xxxxxxxxxxxxxxxx
1075          */
1076
1077         if (wsi->ietf_spec_revision == 0) {
1078                 if (!wsi->utf8_token[WSI_TOKEN_HTTP].token_len ||
1079                         !wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len ||
1080                         !wsi->utf8_token[WSI_TOKEN_CHALLENGE].token_len ||
1081                         !wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len ||
1082                         (!wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len &&
1083                         wsi->c_protocol != NULL)) {
1084                         debug("libwebsocket_client_handshake "
1085                                         "missing required header(s)\n");
1086                         pkt[len] = '\0';
1087                         debug("%s", pkt);
1088                         goto bail3;
1089                 }
1090
1091                 strtolower(wsi->utf8_token[WSI_TOKEN_HTTP].token);
1092                 if (strncmp(wsi->utf8_token[WSI_TOKEN_HTTP].token,
1093                                                             "101", 3)) {
1094                         fprintf(stderr, "libwebsocket_client_handshake "
1095                                 "server sent bad HTTP response '%s'\n",
1096                                 wsi->utf8_token[WSI_TOKEN_HTTP].token);
1097                         goto bail3;
1098                 }
1099
1100                 if (wsi->utf8_token[WSI_TOKEN_CHALLENGE].token_len <
1101                                                                    16) {
1102                         fprintf(stderr, "libwebsocket_client_handshake "
1103                                 "challenge reply too short %d\n",
1104                                 wsi->utf8_token[
1105                                         WSI_TOKEN_CHALLENGE].token_len);
1106                         pkt[len] = '\0';
1107                         debug("%s", pkt);
1108                         goto bail3;
1109
1110                 }
1111
1112                 goto select_protocol;
1113         }
1114
1115         /*
1116          * well, what the server sent looked reasonable for syntax.
1117          * Now let's confirm it sent all the necessary headers
1118          */
1119 #if 0
1120         fprintf(stderr, "WSI_TOKEN_HTTP: %d\n", wsi->utf8_token[WSI_TOKEN_HTTP].token_len);
1121         fprintf(stderr, "WSI_TOKEN_UPGRADE: %d\n", wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len);
1122         fprintf(stderr, "WSI_TOKEN_CONNECTION: %d\n", wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len);
1123         fprintf(stderr, "WSI_TOKEN_ACCEPT: %d\n", wsi->utf8_token[WSI_TOKEN_ACCEPT].token_len);
1124         fprintf(stderr, "WSI_TOKEN_NONCE: %d\n", wsi->utf8_token[WSI_TOKEN_NONCE].token_len);
1125         fprintf(stderr, "WSI_TOKEN_PROTOCOL: %d\n", wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len);
1126 #endif
1127          if (!wsi->utf8_token[WSI_TOKEN_HTTP].token_len ||
1128                 !wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len ||
1129                 !wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len ||
1130                 !wsi->utf8_token[WSI_TOKEN_ACCEPT].token_len ||
1131                 (!wsi->utf8_token[WSI_TOKEN_NONCE].token_len &&
1132                                    wsi->ietf_spec_revision == 4) ||
1133                 (!wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len &&
1134                                                  wsi->c_protocol != NULL)) {
1135                  debug("libwebsocket_client_handshake "
1136                                         "missing required header(s)\n");
1137                 pkt[len] = '\0';
1138                 debug("%s", pkt);
1139                 goto bail3;
1140         }
1141
1142         /*
1143          * Everything seems to be there, now take a closer look at what
1144          * is in each header
1145          */
1146
1147         strtolower(wsi->utf8_token[WSI_TOKEN_HTTP].token);
1148         if (strncmp(wsi->utf8_token[WSI_TOKEN_HTTP].token, "101", 3)) {
1149                 fprintf(stderr, "libwebsocket_client_handshake "
1150                                 "server sent bad HTTP response '%s'\n",
1151                                  wsi->utf8_token[WSI_TOKEN_HTTP].token);
1152                 goto bail3;
1153         }
1154
1155         strtolower(wsi->utf8_token[WSI_TOKEN_UPGRADE].token);
1156         if (strcmp(wsi->utf8_token[WSI_TOKEN_UPGRADE].token,
1157                                                          "websocket")) {
1158                 fprintf(stderr, "libwebsocket_client_handshake server "
1159                                 "sent bad Upgrade header '%s'\n",
1160                                   wsi->utf8_token[WSI_TOKEN_UPGRADE].token);
1161                 goto bail3;
1162         }
1163
1164         strtolower(wsi->utf8_token[WSI_TOKEN_CONNECTION].token);
1165         if (strcmp(wsi->utf8_token[WSI_TOKEN_CONNECTION].token,
1166                                                            "upgrade")) {
1167                 fprintf(stderr, "libwebsocket_client_handshake server "
1168                                 "sent bad Connection hdr '%s'\n",
1169                            wsi->utf8_token[WSI_TOKEN_CONNECTION].token);
1170                 goto bail3;
1171         }
1172
1173 select_protocol:
1174         pc = wsi->c_protocol;
1175         if (pc == NULL)
1176                 fprintf(stderr, "lws_client_interpret_server_handshake: NULL c_protocol\n");
1177         else
1178                 debug("lws_client_interpret_server_handshake: cPprotocol='%s'\n", pc);
1179
1180         /*
1181          * confirm the protocol the server wants to talk was in the list
1182          * of protocols we offered
1183          */
1184
1185         if (!wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len) {
1186
1187                 fprintf(stderr, "lws_client_interpret_server_handshake WSI_TOKEN_PROTOCOL is null\n");
1188                 /*
1189                  * no protocol name to work from,
1190                  * default to first protocol
1191                  */
1192                 wsi->protocol = &context->protocols[0];
1193
1194                 free(wsi->c_protocol);
1195
1196                 goto check_accept;
1197         }
1198
1199         while (*pc && !okay) {
1200                 if ((!strncmp(pc,
1201                         wsi->utf8_token[WSI_TOKEN_PROTOCOL].token,
1202                    wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len)) &&
1203          (pc[wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len] == ',' ||
1204            pc[wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len] == '\0')) {
1205                         okay = 1;
1206                         continue;
1207                 }
1208                 while (*pc && *pc != ',')
1209                         pc++;
1210                 while (*pc && *pc != ' ')
1211                         pc++;
1212         }
1213
1214         /* done with him now */
1215
1216         if (wsi->c_protocol)
1217                 free(wsi->c_protocol);
1218
1219
1220         if (!okay) {
1221                 fprintf(stderr, "libwebsocket_client_handshake server "
1222                                         "sent bad protocol '%s'\n",
1223                                  wsi->utf8_token[WSI_TOKEN_PROTOCOL].token);
1224                 goto bail2;
1225         }
1226
1227         /*
1228          * identify the selected protocol struct and set it
1229          */
1230         n = 0;
1231         wsi->protocol = NULL;
1232         while (context->protocols[n].callback) {
1233                 if (strcmp(wsi->utf8_token[WSI_TOKEN_PROTOCOL].token,
1234                                            context->protocols[n].name) == 0)
1235                         wsi->protocol = &context->protocols[n];
1236                 n++;
1237         }
1238
1239         if (wsi->protocol == NULL) {
1240                 fprintf(stderr, "libwebsocket_client_handshake server "
1241                                 "requested protocol '%s', which we "
1242                                 "said we supported but we don't!\n",
1243                                  wsi->utf8_token[WSI_TOKEN_PROTOCOL].token);
1244                 goto bail2;
1245         }
1246
1247
1248         /* instantiate the accepted extensions */
1249
1250         if (!wsi->utf8_token[WSI_TOKEN_EXTENSIONS].token_len) {
1251                 debug("no client extenstions allowed by server \n");
1252                 goto check_accept;
1253         }
1254
1255         /*
1256          * break down the list of server accepted extensions
1257          * and go through matching them or identifying bogons
1258          */
1259
1260         c = wsi->utf8_token[WSI_TOKEN_EXTENSIONS].token;
1261         n = 0;
1262         while (more) {
1263
1264                 if (*c && (*c != ',' && *c != ' ' && *c != '\t')) {
1265                         ext_name[n] = *c++;
1266                         if (n < sizeof(ext_name) - 1)
1267                                 n++;
1268                         continue;
1269                 }
1270                 ext_name[n] = '\0';
1271                 if (!*c)
1272                         more = 0;
1273                 else {
1274                         c++;
1275                         if (!n)
1276                                 continue;
1277                 }
1278
1279                 /* check we actually support it */
1280
1281                 debug("checking client ext %s\n", ext_name);
1282
1283                 n = 0;
1284                 ext = wsi->protocol->owning_server->extensions;
1285                 while (ext && ext->callback) {
1286
1287                         if (strcmp(ext_name, ext->name)) {
1288                                 ext++;
1289                                 continue;
1290                         }
1291
1292                         n = 1;
1293
1294                         debug("instantiating client ext %s\n", ext_name);
1295
1296                         /* instantiate the extension on this conn */
1297
1298                         wsi->active_extensions_user[
1299                                 wsi->count_active_extensions] =
1300                                          malloc(ext->per_session_data_size);
1301                         memset(wsi->active_extensions_user[
1302                                 wsi->count_active_extensions], 0,
1303                                                     ext->per_session_data_size);
1304                         wsi->active_extensions[
1305                                   wsi->count_active_extensions] = ext;
1306
1307                         /* allow him to construct his context */
1308
1309                         ext->callback(wsi->protocol->owning_server,
1310                                 ext, wsi,
1311                                    LWS_EXT_CALLBACK_CLIENT_CONSTRUCT,
1312                                         wsi->active_extensions_user[
1313                                          wsi->count_active_extensions],
1314                                                                    NULL, 0);
1315
1316                         wsi->count_active_extensions++;
1317
1318                         ext++;
1319                 }
1320
1321                 if (n == 0) {
1322                         fprintf(stderr, "Server said we should use"
1323                                   "an unknown extension '%s'!\n", ext_name);
1324                         goto bail2;
1325                 }
1326
1327                 n = 0;
1328         }
1329
1330
1331 check_accept:
1332
1333         if (wsi->ietf_spec_revision == 0) {
1334
1335                 if (memcmp(wsi->initial_handshake_hash_base64,
1336                           wsi->utf8_token[WSI_TOKEN_CHALLENGE].token, 16)) {
1337                         fprintf(stderr, "libwebsocket_client_handshake "
1338                                            "failed 00 challenge compare\n");
1339                                 pkt[len] = '\0';
1340                                 fprintf(stderr, "%s", pkt);
1341                                 goto bail2;
1342                 }
1343
1344                 goto accept_ok;
1345         }
1346
1347         /*
1348          * Confirm his accept token is the one we precomputed
1349          */
1350
1351         if (strcmp(wsi->utf8_token[WSI_TOKEN_ACCEPT].token,
1352                                   wsi->initial_handshake_hash_base64)) {
1353                 fprintf(stderr, "libwebsocket_client_handshake server "
1354                         "sent bad ACCEPT '%s' vs computed '%s'\n",
1355                         wsi->utf8_token[WSI_TOKEN_ACCEPT].token,
1356                                         wsi->initial_handshake_hash_base64);
1357                 goto bail2;
1358         }
1359
1360         if (wsi->ietf_spec_revision == 4) {
1361                 /*
1362                  * Calculate the 04 masking key to use when
1363                  * sending data to server
1364                  */
1365
1366                 strcpy((char *)buf, wsi->key_b64);
1367                 p = (char *)buf + strlen(wsi->key_b64);
1368                 strcpy(p, wsi->utf8_token[WSI_TOKEN_NONCE].token);
1369                 p += wsi->utf8_token[WSI_TOKEN_NONCE].token_len;
1370                 strcpy(p, magic_websocket_04_masking_guid);
1371                 SHA1(buf, strlen((char *)buf), wsi->masking_key_04);
1372         }
1373         accept_ok:
1374
1375         /* allocate the per-connection user memory (if any) */
1376         if (wsi->protocol->per_session_data_size && !libwebsocket_ensure_user_space(wsi))
1377           goto bail2;
1378
1379         /* clear his proxy connection timeout */
1380
1381         libwebsocket_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
1382
1383         /* mark him as being alive */
1384
1385         wsi->state = WSI_STATE_ESTABLISHED;
1386         wsi->mode = LWS_CONNMODE_WS_CLIENT;
1387
1388         fprintf(stderr, "handshake OK for protocol %s\n",
1389                                                    wsi->protocol->name);
1390
1391         /* call him back to inform him he is up */
1392
1393         wsi->protocol->callback(context, wsi,
1394                          LWS_CALLBACK_CLIENT_ESTABLISHED,
1395                          wsi->user_space,
1396                          NULL, 0);
1397
1398         /*
1399          * inform all extensions, not just active ones since they
1400          * already know
1401          */
1402
1403         ext = context->extensions;
1404
1405         while (ext && ext->callback) {
1406                 v = NULL;
1407                 for (n = 0; n < wsi->count_active_extensions; n++)
1408                         if (wsi->active_extensions[n] == ext)
1409                                 v = wsi->active_extensions_user[n];
1410
1411                 ext->callback(context, ext, wsi,
1412                           LWS_EXT_CALLBACK_ANY_WSI_ESTABLISHED, v, NULL, 0);
1413                 ext++;
1414         }
1415
1416         return 0;
1417
1418 bail3:
1419         if (wsi->c_protocol)
1420                 free(wsi->c_protocol);
1421
1422 bail2:
1423         libwebsocket_close_and_free_session(context, wsi,
1424                                                  LWS_CLOSE_STATUS_NOSTATUS);
1425         return 1;
1426 }
1427
1428
1429
1430 /**
1431  * libwebsocket_service_fd() - Service polled socket with something waiting
1432  * @context:    Websocket context
1433  * @pollfd:     The pollfd entry describing the socket fd and which events
1434  *              happened.
1435  *
1436  *      This function closes any active connections and then frees the
1437  *      context.  After calling this, any further use of the context is
1438  *      undefined.
1439  */
1440
1441 int
1442 libwebsocket_service_fd(struct libwebsocket_context *context,
1443                                                           struct pollfd *pollfd)
1444 {
1445         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 1 + MAX_BROADCAST_PAYLOAD +
1446                                                   LWS_SEND_BUFFER_POST_PADDING];
1447         struct libwebsocket *wsi;
1448         struct libwebsocket *new_wsi;
1449         int n;
1450         int m;
1451         ssize_t len;
1452         int accept_fd;
1453         unsigned int clilen;
1454         struct sockaddr_in cli_addr;
1455         struct timeval tv;
1456         char pkt[1024];
1457         char *p = &pkt[0];
1458         int more = 1;
1459         struct lws_tokens eff_buf;
1460         int opt = 1;
1461         char c;
1462
1463 #ifdef LWS_OPENSSL_SUPPORT
1464         char ssl_err_buf[512];
1465 #endif
1466         /*
1467          * you can call us with pollfd = NULL to just allow the once-per-second
1468          * global timeout checks; if less than a second since the last check
1469          * it returns immediately then.
1470          */
1471
1472         gettimeofday(&tv, NULL);
1473
1474         if (context->last_timeout_check_s != tv.tv_sec) {
1475                 context->last_timeout_check_s = tv.tv_sec;
1476
1477                 /* global timeout check once per second */
1478
1479                 for (n = 0; n < context->fds_count; n++) {
1480                         wsi = wsi_from_fd(context, context->fds[n].fd);
1481
1482                         libwebsocket_service_timeout_check(context, wsi,
1483                                                                      tv.tv_sec);
1484                 }
1485         }
1486
1487         /* just here for timeout management? */
1488
1489         if (pollfd == NULL)
1490                 return 0;
1491
1492         /* no, here to service a socket descriptor */
1493
1494         wsi = wsi_from_fd(context, pollfd->fd);
1495
1496         if (wsi == NULL)
1497                 return 1;
1498
1499         switch (wsi->mode) {
1500         case LWS_CONNMODE_SERVER_LISTENER:
1501
1502                 /* pollin means a client has connected to us then */
1503
1504                 if (!pollfd->revents & POLLIN)
1505                         break;
1506
1507                 if (context->fds_count >= MAX_CLIENTS) {
1508                         fprintf(stderr, "too busy to accept new client\n");
1509                         break;
1510                 }
1511
1512                 /* listen socket got an unencrypted connection... */
1513
1514                 clilen = sizeof(cli_addr);
1515                 accept_fd  = accept(pollfd->fd, (struct sockaddr *)&cli_addr,
1516                                                                        &clilen);
1517                 if (accept_fd < 0) {
1518                         fprintf(stderr, "ERROR on accept");
1519                         break;
1520                 }
1521
1522                 /* Disable Nagle */
1523                 opt = 1;
1524         setsockopt(accept_fd, IPPROTO_TCP, TCP_NODELAY, (const void *)&opt,
1525                                 sizeof(opt));
1526
1527                 /*
1528                  * look at who we connected to and give user code a chance
1529                  * to reject based on client IP.  There's no protocol selected
1530                  * yet so we issue this to protocols[0]
1531                  */
1532
1533                 if ((context->protocols[0].callback)(context, wsi,
1534                                 LWS_CALLBACK_FILTER_NETWORK_CONNECTION,
1535                                              (void*)(long)accept_fd, NULL, 0)) {
1536                         debug("Callback denied network connection\n");
1537 #ifdef WIN32
1538                         closesocket(accept_fd);
1539 #else
1540                         close(accept_fd);
1541 #endif
1542                         break;
1543                 }
1544
1545                 /* accepting connection to main listener */
1546
1547                 new_wsi = libwebsocket_create_new_server_wsi(context);
1548                 if (new_wsi == NULL)
1549                         break;
1550
1551                 new_wsi->sock = accept_fd;
1552
1553
1554 #ifdef LWS_OPENSSL_SUPPORT
1555                 new_wsi->ssl = NULL;
1556
1557                 if (context->use_ssl) {
1558
1559                         new_wsi->ssl = SSL_new(context->ssl_ctx);
1560                         if (new_wsi->ssl == NULL) {
1561                                 fprintf(stderr, "SSL_new failed: %s\n",
1562                                     ERR_error_string(SSL_get_error(
1563                                     new_wsi->ssl, 0), NULL));
1564                                     libwebsockets_decode_ssl_error();
1565                                 free(new_wsi);
1566                                 break;
1567                         }
1568
1569                         SSL_set_fd(new_wsi->ssl, accept_fd);
1570
1571                         n = SSL_accept(new_wsi->ssl);
1572                         if (n != 1) {
1573                                 /*
1574                                  * browsers seem to probe with various
1575                                  * ssl params which fail then retry
1576                                  * and succeed
1577                                  */
1578                                 debug("SSL_accept failed skt %u: %s\n",
1579                                       pollfd->fd,
1580                                       ERR_error_string(SSL_get_error(
1581                                       new_wsi->ssl, n), NULL));
1582                                 SSL_free(
1583                                        new_wsi->ssl);
1584                                 free(new_wsi);
1585                                 break;
1586                         }
1587
1588                         debug("accepted new SSL conn  "
1589                               "port %u on fd=%d SSL ver %s\n",
1590                                 ntohs(cli_addr.sin_port), accept_fd,
1591                                   SSL_get_version(new_wsi->ssl));
1592
1593                 } else
1594 #endif
1595                         debug("accepted new conn  port %u on fd=%d\n",
1596                                           ntohs(cli_addr.sin_port), accept_fd);
1597
1598                 insert_wsi(context, new_wsi);
1599
1600                 /*
1601                  * make sure NO events are seen yet on this new socket
1602                  * (otherwise we inherit old fds[client].revents from
1603                  * previous socket there and die mysteriously! )
1604                  */
1605                 context->fds[context->fds_count].revents = 0;
1606
1607                 context->fds[context->fds_count].events = POLLIN;
1608                 context->fds[context->fds_count++].fd = accept_fd;
1609
1610                 /* external POLL support via protocol 0 */
1611                 context->protocols[0].callback(context, new_wsi,
1612                         LWS_CALLBACK_ADD_POLL_FD,
1613                         (void *)(long)accept_fd, NULL, POLLIN);
1614
1615                 break;
1616
1617         case LWS_CONNMODE_BROADCAST_PROXY_LISTENER:
1618
1619                 /* as we are listening, POLLIN means accept() is needed */
1620
1621                 if (!pollfd->revents & POLLIN)
1622                         break;
1623
1624                 /* listen socket got an unencrypted connection... */
1625
1626                 clilen = sizeof(cli_addr);
1627                 accept_fd  = accept(pollfd->fd, (struct sockaddr *)&cli_addr,
1628                                                                        &clilen);
1629                 if (accept_fd < 0) {
1630                         fprintf(stderr, "ERROR on accept");
1631                         break;
1632                 }
1633
1634                 if (context->fds_count >= MAX_CLIENTS) {
1635                         fprintf(stderr, "too busy to accept new broadcast "
1636                                                               "proxy client\n");
1637 #ifdef WIN32
1638                         closesocket(accept_fd);
1639 #else
1640                         close(accept_fd);
1641 #endif
1642                         break;
1643                 }
1644
1645                 /* create a dummy wsi for the connection and add it */
1646
1647                 new_wsi = malloc(sizeof(struct libwebsocket));
1648                 memset(new_wsi, 0, sizeof (struct libwebsocket));
1649                 new_wsi->sock = accept_fd;
1650                 new_wsi->mode = LWS_CONNMODE_BROADCAST_PROXY;
1651                 new_wsi->state = WSI_STATE_ESTABLISHED;
1652                 new_wsi->count_active_extensions = 0;
1653                 /* note which protocol we are proxying */
1654                 new_wsi->protocol_index_for_broadcast_proxy =
1655                                         wsi->protocol_index_for_broadcast_proxy;
1656                 insert_wsi(context, new_wsi);
1657
1658                 /* add connected socket to internal poll array */
1659
1660                 context->fds[context->fds_count].revents = 0;
1661                 context->fds[context->fds_count].events = POLLIN;
1662                 context->fds[context->fds_count++].fd = accept_fd;
1663
1664                 /* external POLL support via protocol 0 */
1665                 context->protocols[0].callback(context, new_wsi,
1666                         LWS_CALLBACK_ADD_POLL_FD,
1667                         (void *)(long)accept_fd, NULL, POLLIN);
1668
1669                 break;
1670
1671         case LWS_CONNMODE_BROADCAST_PROXY:
1672
1673                 /* handle session socket closed */
1674
1675                 if (pollfd->revents & (POLLERR | POLLHUP)) {
1676
1677                         debug("Session Socket %p (fd=%d) dead\n",
1678                                 (void *)wsi, pollfd->fd);
1679
1680                         libwebsocket_close_and_free_session(context, wsi,
1681                                                        LWS_CLOSE_STATUS_NORMAL);
1682                         return 1;
1683                 }
1684
1685                 /*
1686                  * either extension code with stuff to spill, or the user code,
1687                  * requested a callback when it was OK to write
1688                  */
1689
1690                 if (pollfd->revents & POLLOUT)
1691                         if (lws_handle_POLLOUT_event(context, wsi, pollfd) < 0) {
1692                                 libwebsocket_close_and_free_session(context, wsi,
1693                                                        LWS_CLOSE_STATUS_NORMAL);
1694                                 return 1;
1695                         }
1696
1697                 /* any incoming data ready? */
1698
1699                 if (!(pollfd->revents & POLLIN))
1700                         break;
1701
1702                 /* get the issued broadcast payload from the socket */
1703
1704                 len = read(pollfd->fd, buf + LWS_SEND_BUFFER_PRE_PADDING,
1705                                                          MAX_BROADCAST_PAYLOAD);
1706                 if (len < 0) {
1707                         fprintf(stderr, "Error reading broadcast payload\n");
1708                         break;
1709                 }
1710
1711                 /* broadcast it to all guys with this protocol index */
1712
1713                 for (n = 0; n < FD_HASHTABLE_MODULUS; n++) {
1714
1715                         for (m = 0; m < context->fd_hashtable[n].length; m++) {
1716
1717                                 new_wsi = context->fd_hashtable[n].wsi[m];
1718
1719                                 /* only to clients we are serving to */
1720
1721                                 if (new_wsi->mode != LWS_CONNMODE_WS_SERVING)
1722                                         continue;
1723
1724                                 /*
1725                                  * never broadcast to non-established
1726                                  * connection
1727                                  */
1728
1729                                 if (new_wsi->state != WSI_STATE_ESTABLISHED)
1730                                         continue;
1731
1732                                 /*
1733                                  * only broadcast to connections using
1734                                  * the requested protocol
1735                                  */
1736
1737                                 if (new_wsi->protocol->protocol_index !=
1738                                         wsi->protocol_index_for_broadcast_proxy)
1739                                         continue;
1740
1741                                 /* broadcast it to this connection */
1742
1743                                 new_wsi->protocol->callback(context, new_wsi,
1744                                         LWS_CALLBACK_BROADCAST,
1745                                         new_wsi->user_space,
1746                                         buf + LWS_SEND_BUFFER_PRE_PADDING, len);
1747                         }
1748                 }
1749                 break;
1750
1751         case LWS_CONNMODE_WS_CLIENT_WAITING_PROXY_REPLY:
1752
1753                 /* handle proxy hung up on us */
1754
1755                 if (pollfd->revents & (POLLERR | POLLHUP)) {
1756
1757                         fprintf(stderr, "Proxy connection %p (fd=%d) dead\n",
1758                                 (void *)wsi, pollfd->fd);
1759
1760                         libwebsocket_close_and_free_session(context, wsi,
1761                                                      LWS_CLOSE_STATUS_NOSTATUS);
1762                         return 1;
1763                 }
1764
1765                 n = recv(wsi->sock, pkt, sizeof pkt, 0);
1766                 if (n < 0) {
1767                         libwebsocket_close_and_free_session(context, wsi,
1768                                                      LWS_CLOSE_STATUS_NOSTATUS);
1769                         fprintf(stderr, "ERROR reading from proxy socket\n");
1770                         return 1;
1771                 }
1772
1773                 pkt[13] = '\0';
1774                 if (strcmp(pkt, "HTTP/1.0 200 ") != 0) {
1775                         libwebsocket_close_and_free_session(context, wsi,
1776                                                      LWS_CLOSE_STATUS_NOSTATUS);
1777                         fprintf(stderr, "ERROR from proxy: %s\n", pkt);
1778                         return 1;
1779                 }
1780
1781                 /* clear his proxy connection timeout */
1782
1783                 libwebsocket_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
1784
1785                 /* fallthru */
1786
1787         case LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE:
1788
1789         #ifdef LWS_OPENSSL_SUPPORT
1790                 if (wsi->use_ssl) {
1791
1792                         wsi->ssl = SSL_new(context->ssl_client_ctx);
1793                         wsi->client_bio = BIO_new_socket(wsi->sock,
1794                                                                    BIO_NOCLOSE);
1795                         SSL_set_bio(wsi->ssl, wsi->client_bio, wsi->client_bio);
1796
1797                         SSL_set_ex_data(wsi->ssl,
1798                                         openssl_websocket_private_data_index,
1799                                                                        context);
1800
1801                         if (SSL_connect(wsi->ssl) <= 0) {
1802                                 fprintf(stderr, "SSL connect error %s\n",
1803                                         ERR_error_string(ERR_get_error(),
1804                                                                   ssl_err_buf));
1805                                 libwebsocket_close_and_free_session(context, wsi,
1806                                                      LWS_CLOSE_STATUS_NOSTATUS);
1807                                 return 1;
1808                         }
1809
1810                         n = SSL_get_verify_result(wsi->ssl);
1811                         if ((n != X509_V_OK) && (
1812                                 n != X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT ||
1813                                                            wsi->use_ssl != 2)) {
1814
1815                                 fprintf(stderr, "server's cert didn't "
1816                                                            "look good %d\n", n);
1817                                 libwebsocket_close_and_free_session(context,
1818                                                 wsi, LWS_CLOSE_STATUS_NOSTATUS);
1819                                 return 1;
1820                         }
1821                 } else {
1822                         wsi->ssl = NULL;
1823         #endif
1824
1825
1826         #ifdef LWS_OPENSSL_SUPPORT
1827                 }
1828         #endif
1829
1830                 p = libwebsockets_generate_client_handshake(context, wsi, p);
1831                 if (p ==NULL)
1832                         return 1;
1833
1834                 /* send our request to the server */
1835
1836         #ifdef LWS_OPENSSL_SUPPORT
1837                 if (wsi->use_ssl)
1838                         n = SSL_write(wsi->ssl, pkt, p - pkt);
1839                 else
1840         #endif
1841                         n = send(wsi->sock, pkt, p - pkt, 0);
1842
1843                 if (n < 0) {
1844                         fprintf(stderr, "ERROR writing to client socket\n");
1845                         libwebsocket_close_and_free_session(context, wsi,
1846                                                      LWS_CLOSE_STATUS_NOSTATUS);
1847                         return 1;
1848                 }
1849
1850                 wsi->parser_state = WSI_TOKEN_NAME_PART;
1851                 wsi->mode = LWS_CONNMODE_WS_CLIENT_WAITING_SERVER_REPLY;
1852                 libwebsocket_set_timeout(wsi,
1853                                 PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE, 5);
1854
1855                 break;
1856
1857         case LWS_CONNMODE_WS_CLIENT_WAITING_SERVER_REPLY:
1858
1859                 /* handle server hung up on us */
1860
1861                 if (pollfd->revents & (POLLERR | POLLHUP)) {
1862
1863                         fprintf(stderr, "Server connection %p (fd=%d) dead\n",
1864                                 (void *)wsi, pollfd->fd);
1865
1866                         goto bail3;
1867                 }
1868
1869
1870                 /* interpret the server response */
1871
1872                 /*
1873                  *  HTTP/1.1 101 Switching Protocols
1874                  *  Upgrade: websocket
1875                  *  Connection: Upgrade
1876                  *  Sec-WebSocket-Accept: me89jWimTRKTWwrS3aRrL53YZSo=
1877                  *  Sec-WebSocket-Nonce: AQIDBAUGBwgJCgsMDQ4PEC==
1878                  *  Sec-WebSocket-Protocol: chat
1879                  */
1880
1881                 /*
1882                  * we have to take some care here to only take from the
1883                  * socket bytewise.  The browser may (and has been seen to
1884                  * in the case that onopen() performs websocket traffic)
1885                  * coalesce both handshake response and websocket traffic
1886                  * in one packet, since at that point the connection is
1887                  * definitively ready from browser pov.
1888                  */
1889
1890                 while (wsi->parser_state != WSI_PARSING_COMPLETE && len > 0) {
1891 #ifdef LWS_OPENSSL_SUPPORT
1892                         if (wsi->use_ssl)
1893                                 len = SSL_read(wsi->ssl, &c, 1);
1894                          else
1895 #endif
1896                                 len = recv(wsi->sock, &c, 1, 0);
1897
1898                         libwebsocket_parse(wsi, c);
1899                 }
1900
1901                 /*
1902                  * hs may also be coming in multiple packets, there is a 5-second
1903                  * libwebsocket timeout still active here too, so if parsing did
1904                  * not complete just wait for next packet coming in this state
1905                  */
1906
1907                 if (wsi->parser_state != WSI_PARSING_COMPLETE)
1908                         break;
1909
1910                 /*
1911                  * otherwise deal with the handshake.  If there's any
1912                  * packet traffic already arrived we'll trigger poll() again
1913                  * right away and deal with it that way
1914                  */
1915
1916                 return lws_client_interpret_server_handshake(context, wsi);
1917
1918 bail3:
1919                 if (wsi->c_protocol)
1920                         free(wsi->c_protocol);
1921                 libwebsocket_close_and_free_session(context, wsi,
1922                                                                  LWS_CLOSE_STATUS_NOSTATUS);
1923                 return 1;
1924
1925         case LWS_CONNMODE_WS_CLIENT_WAITING_EXTENSION_CONNECT:
1926                 fprintf(stderr, "LWS_CONNMODE_WS_CLIENT_WAITING_EXTENSION_CONNECT\n");
1927                 break;
1928
1929         case LWS_CONNMODE_WS_CLIENT_PENDING_CANDIDATE_CHILD:
1930                 fprintf(stderr, "LWS_CONNMODE_WS_CLIENT_PENDING_CANDIDATE_CHILD\n");
1931                 break;
1932
1933
1934         case LWS_CONNMODE_WS_SERVING:
1935         case LWS_CONNMODE_WS_CLIENT:
1936
1937                 /* handle session socket closed */
1938
1939                 if (pollfd->revents & (POLLERR | POLLHUP)) {
1940
1941                         fprintf(stderr, "Session Socket %p (fd=%d) dead\n",
1942                                 (void *)wsi, pollfd->fd);
1943
1944                         libwebsocket_close_and_free_session(context, wsi,
1945                                                      LWS_CLOSE_STATUS_NOSTATUS);
1946                         return 1;
1947                 }
1948
1949                 /* the guy requested a callback when it was OK to write */
1950
1951                 if ((pollfd->revents & POLLOUT) &&
1952                                             wsi->state == WSI_STATE_ESTABLISHED)
1953                         if (lws_handle_POLLOUT_event(context, wsi,
1954                                                                   pollfd) < 0) {
1955                                 libwebsocket_close_and_free_session(
1956                                          context, wsi, LWS_CLOSE_STATUS_NORMAL);
1957                                 return 1;
1958                         }
1959
1960
1961                 /* any incoming data ready? */
1962
1963                 if (!(pollfd->revents & POLLIN))
1964                         break;
1965
1966 #ifdef LWS_OPENSSL_SUPPORT
1967                 if (wsi->ssl)
1968                         eff_buf.token_len = SSL_read(wsi->ssl, buf, sizeof buf);
1969                 else
1970 #endif
1971                         eff_buf.token_len =
1972                                            recv(pollfd->fd, buf, sizeof buf, 0);
1973
1974                 if (eff_buf.token_len < 0) {
1975                         fprintf(stderr, "Socket read returned %d\n",
1976                                                             eff_buf.token_len);
1977                         if (errno != EINTR)
1978                                 libwebsocket_close_and_free_session(context, wsi,
1979                                                                  LWS_CLOSE_STATUS_NOSTATUS);
1980                         return 1;
1981                 }
1982                 if (!eff_buf.token_len) {
1983                         libwebsocket_close_and_free_session(context, wsi,
1984                                                      LWS_CLOSE_STATUS_NOSTATUS);
1985                         return 1;
1986                 }
1987
1988                 /*
1989                  * give any active extensions a chance to munge the buffer
1990                  * before parse.  We pass in a pointer to an lws_tokens struct
1991                  * prepared with the default buffer and content length that's in
1992                  * there.  Rather than rewrite the default buffer, extensions
1993                  * that expect to grow the buffer can adapt .token to
1994                  * point to their own per-connection buffer in the extension
1995                  * user allocation.  By default with no extensions or no
1996                  * extension callback handling, just the normal input buffer is
1997                  * used then so it is efficient.
1998                  */
1999
2000                 eff_buf.token = (char *)buf;
2001
2002                 more = 1;
2003                 while (more) {
2004
2005                         more = 0;
2006
2007                         for (n = 0; n < wsi->count_active_extensions; n++) {
2008                                 m = wsi->active_extensions[n]->callback(context,
2009                                         wsi->active_extensions[n], wsi,
2010                                         LWS_EXT_CALLBACK_PACKET_RX_PREPARSE,
2011                                         wsi->active_extensions_user[n],
2012                                                                    &eff_buf, 0);
2013                                 if (m < 0) {
2014                                         fprintf(stderr, "Extension reports fatal error\n");
2015                                         libwebsocket_close_and_free_session(context, wsi,
2016                                                              LWS_CLOSE_STATUS_NOSTATUS);
2017                                         return 1;
2018                                 }
2019                                 if (m)
2020                                         more = 1;
2021                         }
2022
2023                         /* service incoming data */
2024
2025                         if (eff_buf.token_len) {
2026                                 n = libwebsocket_read(context, wsi,
2027                                      (unsigned char *)eff_buf.token, eff_buf.token_len);
2028                                 if (n < 0)
2029                                         /* we closed wsi */
2030                                         return 1;
2031                         }
2032
2033                         eff_buf.token = NULL;
2034                         eff_buf.token_len = 0;
2035                 }
2036                 break;
2037         }
2038
2039         return 0;
2040 }
2041
2042
2043 /**
2044  * libwebsocket_context_destroy() - Destroy the websocket context
2045  * @context:    Websocket context
2046  *
2047  *      This function closes any active connections and then frees the
2048  *      context.  After calling this, any further use of the context is
2049  *      undefined.
2050  */
2051 void
2052 libwebsocket_context_destroy(struct libwebsocket_context *context)
2053 {
2054         int n;
2055         int m;
2056         struct libwebsocket *wsi;
2057         struct libwebsocket_extension *ext;
2058
2059         for (n = 0; n < FD_HASHTABLE_MODULUS; n++)
2060                 for (m = 0; m < context->fd_hashtable[n].length; m++) {
2061                         wsi = context->fd_hashtable[n].wsi[m];
2062                         libwebsocket_close_and_free_session(context, wsi,
2063                                                     LWS_CLOSE_STATUS_GOINGAWAY);
2064                 }
2065
2066         /*
2067          * give all extensions a chance to clean up any per-context
2068          * allocations they might have made
2069          */
2070
2071         ext = context->extensions;
2072         m = LWS_EXT_CALLBACK_CLIENT_CONTEXT_DESTRUCT;
2073         if (context->listen_port)
2074                 m = LWS_EXT_CALLBACK_SERVER_CONTEXT_DESTRUCT;
2075         while (ext->callback) {
2076                 ext->callback(context, ext, NULL, m, NULL, NULL, 0);
2077                 ext++;
2078         }
2079
2080 #ifdef WIN32
2081 #else
2082         close(context->fd_random);
2083 #endif
2084
2085 #ifdef LWS_OPENSSL_SUPPORT
2086         if (context->ssl_ctx)
2087                 SSL_CTX_free(context->ssl_ctx);
2088         if (context->ssl_client_ctx)
2089                 SSL_CTX_free(context->ssl_client_ctx);
2090 #endif
2091
2092         free(context);
2093
2094 #ifdef WIN32
2095         WSACleanup();
2096 #endif
2097 }
2098
2099 /**
2100  * libwebsocket_service() - Service any pending websocket activity
2101  * @context:    Websocket context
2102  * @timeout_ms: Timeout for poll; 0 means return immediately if nothing needed
2103  *              service otherwise block and service immediately, returning
2104  *              after the timeout if nothing needed service.
2105  *
2106  *      This function deals with any pending websocket traffic, for three
2107  *      kinds of event.  It handles these events on both server and client
2108  *      types of connection the same.
2109  *
2110  *      1) Accept new connections to our context's server
2111  *
2112  *      2) Perform pending broadcast writes initiated from other forked
2113  *         processes (effectively serializing asynchronous broadcasts)
2114  *
2115  *      3) Call the receive callback for incoming frame data received by
2116  *          server or client connections.
2117  *
2118  *      You need to call this service function periodically to all the above
2119  *      functions to happen; if your application is single-threaded you can
2120  *      just call it in your main event loop.
2121  *
2122  *      Alternatively you can fork a new process that asynchronously handles
2123  *      calling this service in a loop.  In that case you are happy if this
2124  *      call blocks your thread until it needs to take care of something and
2125  *      would call it with a large nonzero timeout.  Your loop then takes no
2126  *      CPU while there is nothing happening.
2127  *
2128  *      If you are calling it in a single-threaded app, you don't want it to
2129  *      wait around blocking other things in your loop from happening, so you
2130  *      would call it with a timeout_ms of 0, so it returns immediately if
2131  *      nothing is pending, or as soon as it services whatever was pending.
2132  */
2133
2134
2135 int
2136 libwebsocket_service(struct libwebsocket_context *context, int timeout_ms)
2137 {
2138         int n;
2139
2140         /* stay dead once we are dead */
2141
2142         if (context == NULL)
2143                 return 1;
2144
2145         /* wait for something to need service */
2146
2147         n = poll(context->fds, context->fds_count, timeout_ms);
2148         if (n == 0) /* poll timeout */
2149                 return 0;
2150
2151         if (n < 0) {
2152                 /*
2153                 fprintf(stderr, "Listen Socket dead\n");
2154                 */
2155                 return 1;
2156         }
2157
2158         /* handle accept on listening socket? */
2159
2160         for (n = 0; n < context->fds_count; n++)
2161                 if (context->fds[n].revents)
2162                         libwebsocket_service_fd(context, &context->fds[n]);
2163
2164         return 0;
2165 }
2166
2167 int
2168 lws_any_extension_handled(struct libwebsocket_context *context,
2169                                                        struct libwebsocket *wsi,
2170                                                        enum libwebsocket_extension_callback_reasons r,
2171                                                        void *v, size_t len)
2172 {
2173         int n;
2174         int handled = 0;
2175
2176         /* maybe an extension will take care of it for us */
2177
2178         for (n = 0; n < wsi->count_active_extensions && !handled; n++) {
2179                 if (!wsi->active_extensions[n]->callback)
2180                         continue;
2181
2182                 handled |= wsi->active_extensions[n]->callback(context,
2183                         wsi->active_extensions[n], wsi,
2184                         r, wsi->active_extensions_user[n], v, len);
2185         }
2186
2187         return handled;
2188 }
2189
2190
2191 void *
2192 lws_get_extension_user_matching_ext(struct libwebsocket *wsi,
2193                                                         struct libwebsocket_extension * ext)
2194 {
2195         int n = 0;
2196
2197         if (wsi == NULL)
2198                 return NULL;
2199
2200         while (n < wsi->count_active_extensions) {
2201                 if (wsi->active_extensions[n] != ext) {
2202                         n++;
2203                         continue;
2204                 }
2205                 return wsi->active_extensions_user[n];
2206         }
2207
2208         return NULL;
2209 }
2210
2211 /**
2212  * libwebsocket_callback_on_writable() - Request a callback when this socket
2213  *                                       becomes able to be written to without
2214  *                                       blocking
2215  *
2216  * @context:    libwebsockets context
2217  * @wsi:        Websocket connection instance to get callback for
2218  */
2219
2220 int
2221 libwebsocket_callback_on_writable(struct libwebsocket_context *context,
2222                                                        struct libwebsocket *wsi)
2223 {
2224         int n;
2225         int handled = 0;
2226
2227         /* maybe an extension will take care of it for us */
2228
2229         for (n = 0; n < wsi->count_active_extensions; n++) {
2230                 if (!wsi->active_extensions[n]->callback)
2231                         continue;
2232
2233                 handled |= wsi->active_extensions[n]->callback(context,
2234                         wsi->active_extensions[n], wsi,
2235                         LWS_EXT_CALLBACK_REQUEST_ON_WRITEABLE,
2236                                        wsi->active_extensions_user[n], NULL, 0);
2237         }
2238
2239         if (handled)
2240                 return 1;
2241
2242         for (n = 0; n < context->fds_count; n++)
2243                 if (context->fds[n].fd == wsi->sock) {
2244                         context->fds[n].events |= POLLOUT;
2245                         n = context->fds_count + 1;
2246                 }
2247
2248         if (n == context->fds_count)
2249                 fprintf(stderr, "libwebsocket_callback_on_writable: failed to find socket %d\n", wsi->sock);
2250
2251         /* external POLL support via protocol 0 */
2252         context->protocols[0].callback(context, wsi,
2253                 LWS_CALLBACK_SET_MODE_POLL_FD,
2254                 (void *)(long)wsi->sock, NULL, POLLOUT);
2255
2256         return 1;
2257 }
2258
2259 /**
2260  * libwebsocket_callback_on_writable_all_protocol() - Request a callback for
2261  *                      all connections using the given protocol when it
2262  *                      becomes possible to write to each socket without
2263  *                      blocking in turn.
2264  *
2265  * @protocol:   Protocol whose connections will get callbacks
2266  */
2267
2268 int
2269 libwebsocket_callback_on_writable_all_protocol(
2270                                   const struct libwebsocket_protocols *protocol)
2271 {
2272         struct libwebsocket_context *context = protocol->owning_server;
2273         int n;
2274         int m;
2275         struct libwebsocket *wsi;
2276
2277         for (n = 0; n < FD_HASHTABLE_MODULUS; n++) {
2278
2279                 for (m = 0; m < context->fd_hashtable[n].length; m++) {
2280
2281                         wsi = context->fd_hashtable[n].wsi[m];
2282
2283                         if (wsi->protocol == protocol)
2284                                 libwebsocket_callback_on_writable(context, wsi);
2285                 }
2286         }
2287
2288         return 0;
2289 }
2290
2291 /**
2292  * libwebsocket_set_timeout() - marks the wsi as subject to a timeout
2293  *
2294  * You will not need this unless you are doing something special
2295  *
2296  * @wsi:        Websocket connection instance
2297  * @reason:     timeout reason
2298  * @secs:       how many seconds
2299  */
2300
2301 void
2302 libwebsocket_set_timeout(struct libwebsocket *wsi,
2303                                           enum pending_timeout reason, int secs)
2304 {
2305         struct timeval tv;
2306
2307         gettimeofday(&tv, NULL);
2308
2309         wsi->pending_timeout_limit = tv.tv_sec + secs;
2310         wsi->pending_timeout = reason;
2311 }
2312
2313
2314 /**
2315  * libwebsocket_get_socket_fd() - returns the socket file descriptor
2316  *
2317  * You will not need this unless you are doing something special
2318  *
2319  * @wsi:        Websocket connection instance
2320  */
2321
2322 int
2323 libwebsocket_get_socket_fd(struct libwebsocket *wsi)
2324 {
2325         return wsi->sock;
2326 }
2327
2328 /**
2329  * libwebsocket_rx_flow_control() - Enable and disable socket servicing for
2330  *                              receieved packets.
2331  *
2332  * If the output side of a server process becomes choked, this allows flow
2333  * control for the input side.
2334  *
2335  * @wsi:        Websocket connection instance to get callback for
2336  * @enable:     0 = disable read servicing for this connection, 1 = enable
2337  */
2338
2339 int
2340 libwebsocket_rx_flow_control(struct libwebsocket *wsi, int enable)
2341 {
2342         struct libwebsocket_context *context = wsi->protocol->owning_server;
2343         int n;
2344
2345         for (n = 0; n < context->fds_count; n++)
2346                 if (context->fds[n].fd == wsi->sock) {
2347                         if (enable)
2348                                 context->fds[n].events |= POLLIN;
2349                         else
2350                                 context->fds[n].events &= ~POLLIN;
2351
2352                         return 0;
2353                 }
2354
2355         if (enable)
2356                 /* external POLL support via protocol 0 */
2357                 context->protocols[0].callback(context, wsi,
2358                         LWS_CALLBACK_SET_MODE_POLL_FD,
2359                         (void *)(long)wsi->sock, NULL, POLLIN);
2360         else
2361                 /* external POLL support via protocol 0 */
2362                 context->protocols[0].callback(context, wsi,
2363                         LWS_CALLBACK_CLEAR_MODE_POLL_FD,
2364                         (void *)(long)wsi->sock, NULL, POLLIN);
2365
2366 #if 0
2367         fprintf(stderr, "libwebsocket_rx_flow_control "
2368                                                      "unable to find socket\n");
2369 #endif
2370         return 1;
2371 }
2372
2373 /**
2374  * libwebsocket_canonical_hostname() - returns this host's hostname
2375  *
2376  * This is typically used by client code to fill in the host parameter
2377  * when making a client connection.  You can only call it after the context
2378  * has been created.
2379  *
2380  * @context:    Websocket context
2381  */
2382
2383
2384 extern const char *
2385 libwebsocket_canonical_hostname(struct libwebsocket_context *context)
2386 {
2387         return (const char *)context->canonical_hostname;
2388 }
2389
2390
2391 static void sigpipe_handler(int x)
2392 {
2393 }
2394
2395 #ifdef LWS_OPENSSL_SUPPORT
2396 static int
2397 OpenSSL_verify_callback(int preverify_ok, X509_STORE_CTX *x509_ctx)
2398 {
2399
2400         SSL *ssl;
2401         int n;
2402         struct libwebsocket_context *context;
2403
2404         ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
2405                 SSL_get_ex_data_X509_STORE_CTX_idx());
2406
2407         /*
2408          * !!! nasty openssl requires the index to come as a library-scope
2409          * static
2410          */
2411         context = SSL_get_ex_data(ssl, openssl_websocket_private_data_index);
2412
2413         n = context->protocols[0].callback(NULL, NULL,
2414                 LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION,
2415                                                    x509_ctx, ssl, preverify_ok);
2416
2417         /* convert return code from 0 = OK to 1 = OK */
2418
2419         if (!n)
2420                 n = 1;
2421         else
2422                 n = 0;
2423
2424         return n;
2425 }
2426 #endif
2427
2428
2429 /**
2430  * libwebsocket_create_context() - Create the websocket handler
2431  * @port:       Port to listen on... you can use 0 to suppress listening on
2432  *              any port, that's what you want if you are not running a
2433  *              websocket server at all but just using it as a client
2434  * @interf:  NULL to bind the listen socket to all interfaces, or the
2435  *              interface name, eg, "eth2"
2436  * @protocols:  Array of structures listing supported protocols and a protocol-
2437  *              specific callback for each one.  The list is ended with an
2438  *              entry that has a NULL callback pointer.
2439  *              It's not const because we write the owning_server member
2440  * @extensions: NULL or array of libwebsocket_extension structs listing the
2441  *              extensions this context supports
2442  * @ssl_cert_filepath:  If libwebsockets was compiled to use ssl, and you want
2443  *                      to listen using SSL, set to the filepath to fetch the
2444  *                      server cert from, otherwise NULL for unencrypted
2445  * @ssl_private_key_filepath: filepath to private key if wanting SSL mode,
2446  *                      else ignored
2447  * @gid:        group id to change to after setting listen socket, or -1.
2448  * @uid:        user id to change to after setting listen socket, or -1.
2449  * @options:    0, or LWS_SERVER_OPTION_DEFEAT_CLIENT_MASK
2450  *
2451  *      This function creates the listening socket and takes care
2452  *      of all initialization in one step.
2453  *
2454  *      After initialization, it returns a struct libwebsocket_context * that
2455  *      represents this server.  After calling, user code needs to take care
2456  *      of calling libwebsocket_service() with the context pointer to get the
2457  *      server's sockets serviced.  This can be done in the same process context
2458  *      or a forked process, or another thread,
2459  *
2460  *      The protocol callback functions are called for a handful of events
2461  *      including http requests coming in, websocket connections becoming
2462  *      established, and data arriving; it's also called periodically to allow
2463  *      async transmission.
2464  *
2465  *      HTTP requests are sent always to the FIRST protocol in @protocol, since
2466  *      at that time websocket protocol has not been negotiated.  Other
2467  *      protocols after the first one never see any HTTP callack activity.
2468  *
2469  *      The server created is a simple http server by default; part of the
2470  *      websocket standard is upgrading this http connection to a websocket one.
2471  *
2472  *      This allows the same server to provide files like scripts and favicon /
2473  *      images or whatever over http and dynamic data over websockets all in
2474  *      one place; they're all handled in the user callback.
2475  */
2476
2477 struct libwebsocket_context *
2478 libwebsocket_create_context(int port, const char *interf,
2479                                struct libwebsocket_protocols *protocols,
2480                                struct libwebsocket_extension *extensions,
2481                                const char *ssl_cert_filepath,
2482                                const char *ssl_private_key_filepath,
2483                                int gid, int uid, unsigned int options)
2484 {
2485         int n;
2486         int m;
2487         int sockfd = 0;
2488         int fd;
2489         struct sockaddr_in serv_addr, cli_addr;
2490         int opt = 1;
2491         struct libwebsocket_context *context = NULL;
2492         unsigned int slen;
2493         char *p;
2494         char hostname[1024];
2495         struct hostent *he;
2496         struct libwebsocket *wsi;
2497
2498 #ifdef LWS_OPENSSL_SUPPORT
2499         SSL_METHOD *method;
2500         char ssl_err_buf[512];
2501 #endif
2502
2503 #ifdef _WIN32
2504         {
2505                 WORD wVersionRequested;
2506                 WSADATA wsaData;
2507                 int err;
2508         HMODULE wsdll;
2509
2510                 /* Use the MAKEWORD(lowbyte, highbyte) macro from Windef.h */
2511                 wVersionRequested = MAKEWORD(2, 2);
2512
2513                 err = WSAStartup(wVersionRequested, &wsaData);
2514                 if (err != 0) {
2515                         /* Tell the user that we could not find a usable */
2516                         /* Winsock DLL.                                  */
2517                         fprintf(stderr, "WSAStartup failed with error: %d\n",
2518                                                                            err);
2519                         return NULL;
2520                 }
2521
2522         wsdll = GetModuleHandle("Ws2_32.dll");
2523         if (wsdll)
2524         {
2525             poll = (PFNWSAPOLL)GetProcAddress(wsdll, "WSAPoll");
2526         }
2527
2528         if (!poll)
2529         {
2530             poll = emulated_poll;
2531         }
2532         }
2533 #endif
2534
2535
2536         context = malloc(sizeof(struct libwebsocket_context));
2537         if (!context) {
2538                 fprintf(stderr, "No memory for websocket context\n");
2539                 return NULL;
2540         }
2541         context->protocols = protocols;
2542         context->listen_port = port;
2543         context->http_proxy_port = 0;
2544         context->http_proxy_address[0] = '\0';
2545         context->options = options;
2546         context->fds_count = 0;
2547         context->extensions = extensions;
2548
2549 #ifdef WIN32
2550         context->fd_random = 0;
2551 #else
2552         context->fd_random = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
2553         if (context->fd_random < 0) {
2554                 fprintf(stderr, "Unable to open random device %s %d\n",
2555                                     SYSTEM_RANDOM_FILEPATH, context->fd_random);
2556                 return NULL;
2557         }
2558 #endif
2559
2560 #ifdef LWS_OPENSSL_SUPPORT
2561         context->use_ssl = 0;
2562         context->ssl_ctx = NULL;
2563         context->ssl_client_ctx = NULL;
2564         openssl_websocket_private_data_index = 0;
2565 #endif
2566         /* find canonical hostname */
2567
2568         hostname[(sizeof hostname) - 1] = '\0';
2569         gethostname(hostname, (sizeof hostname) - 1);
2570         he = gethostbyname(hostname);
2571         if (he) {
2572                 strncpy(context->canonical_hostname, he->h_name,
2573                                         sizeof context->canonical_hostname - 1);
2574                 context->canonical_hostname[
2575                                 sizeof context->canonical_hostname - 1] = '\0';
2576         } else
2577                 strncpy(context->canonical_hostname, hostname,
2578                                         sizeof context->canonical_hostname - 1);
2579
2580         /* split the proxy ads:port if given */
2581
2582         p = getenv("http_proxy");
2583         if (p) {
2584                 strncpy(context->http_proxy_address, p,
2585                                         sizeof context->http_proxy_address - 1);
2586                 context->http_proxy_address[
2587                                  sizeof context->http_proxy_address - 1] = '\0';
2588
2589                 p = strchr(context->http_proxy_address, ':');
2590                 if (p == NULL) {
2591                         fprintf(stderr, "http_proxy needs to be ads:port\n");
2592                         return NULL;
2593                 }
2594                 *p = '\0';
2595                 context->http_proxy_port = atoi(p + 1);
2596
2597                 fprintf(stderr, "Using proxy %s:%u\n",
2598                                 context->http_proxy_address,
2599                                                       context->http_proxy_port);
2600         }
2601
2602         if (port) {
2603
2604 #ifdef LWS_OPENSSL_SUPPORT
2605                 context->use_ssl = ssl_cert_filepath != NULL &&
2606                                                ssl_private_key_filepath != NULL;
2607                 if (context->use_ssl)
2608                         fprintf(stderr, " Compiled with SSL support, "
2609                                                                   "using it\n");
2610                 else
2611                         fprintf(stderr, " Compiled with SSL support, "
2612                                                               "not using it\n");
2613
2614 #else
2615                 if (ssl_cert_filepath != NULL &&
2616                                              ssl_private_key_filepath != NULL) {
2617                         fprintf(stderr, " Not compiled for OpenSSl support!\n");
2618                         return NULL;
2619                 }
2620                 fprintf(stderr, " Compiled without SSL support, "
2621                                                        "serving unencrypted\n");
2622 #endif
2623         }
2624
2625         /* ignore SIGPIPE */
2626 #ifdef WIN32
2627 #else
2628         signal(SIGPIPE, sigpipe_handler);
2629 #endif
2630
2631
2632 #ifdef LWS_OPENSSL_SUPPORT
2633
2634         /* basic openssl init */
2635
2636         SSL_library_init();
2637
2638         OpenSSL_add_all_algorithms();
2639         SSL_load_error_strings();
2640
2641         openssl_websocket_private_data_index =
2642                 SSL_get_ex_new_index(0, "libwebsockets", NULL, NULL, NULL);
2643
2644         /*
2645          * Firefox insists on SSLv23 not SSLv3
2646          * Konq disables SSLv2 by default now, SSLv23 works
2647          */
2648
2649         method = (SSL_METHOD *)SSLv23_server_method();
2650         if (!method) {
2651                 fprintf(stderr, "problem creating ssl method: %s\n",
2652                         ERR_error_string(ERR_get_error(), ssl_err_buf));
2653                 return NULL;
2654         }
2655         context->ssl_ctx = SSL_CTX_new(method); /* create context */
2656         if (!context->ssl_ctx) {
2657                 fprintf(stderr, "problem creating ssl context: %s\n",
2658                         ERR_error_string(ERR_get_error(), ssl_err_buf));
2659                 return NULL;
2660         }
2661
2662         /* client context */
2663         if (port == CONTEXT_PORT_NO_LISTEN)
2664         {
2665                 method = (SSL_METHOD *)SSLv23_client_method();
2666                 if (!method) {
2667                         fprintf(stderr, "problem creating ssl method: %s\n",
2668                                 ERR_error_string(ERR_get_error(), ssl_err_buf));
2669                         return NULL;
2670                 }
2671                 /* create context */
2672                 context->ssl_client_ctx = SSL_CTX_new(method);
2673                 if (!context->ssl_client_ctx) {
2674                         fprintf(stderr, "problem creating ssl context: %s\n",
2675                                 ERR_error_string(ERR_get_error(), ssl_err_buf));
2676                         return NULL;
2677                 }
2678
2679                 /* openssl init for cert verification (for client sockets) */
2680
2681                 if (!SSL_CTX_load_verify_locations(
2682                                         context->ssl_client_ctx, NULL,
2683                                                       LWS_OPENSSL_CLIENT_CERTS))
2684                         fprintf(stderr,
2685                             "Unable to load SSL Client certs from %s "
2686                             "(set by --with-client-cert-dir= in configure) -- "
2687                                 " client ssl isn't going to work",
2688                                                       LWS_OPENSSL_CLIENT_CERTS);
2689
2690                 /*
2691                  * callback allowing user code to load extra verification certs
2692                  * helping the client to verify server identity
2693                  */
2694
2695                 context->protocols[0].callback(context, NULL,
2696                         LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS,
2697                         context->ssl_client_ctx, NULL, 0);
2698         }
2699         /* as a server, are we requiring clients to identify themselves? */
2700
2701         if (options & LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT) {
2702
2703                 /* absolutely require the client cert */
2704
2705                 SSL_CTX_set_verify(context->ssl_ctx,
2706                        SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
2707                                                        OpenSSL_verify_callback);
2708
2709                 /*
2710                  * give user code a chance to load certs into the server
2711                  * allowing it to verify incoming client certs
2712                  */
2713
2714                 context->protocols[0].callback(context, NULL,
2715                         LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS,
2716                                                      context->ssl_ctx, NULL, 0);
2717         }
2718
2719         if (context->use_ssl) {
2720
2721                 /* openssl init for server sockets */
2722
2723                 /* set the local certificate from CertFile */
2724                 n = SSL_CTX_use_certificate_file(context->ssl_ctx,
2725                                         ssl_cert_filepath, SSL_FILETYPE_PEM);
2726                 if (n != 1) {
2727                         fprintf(stderr, "problem getting cert '%s': %s\n",
2728                                 ssl_cert_filepath,
2729                                 ERR_error_string(ERR_get_error(), ssl_err_buf));
2730                         return NULL;
2731                 }
2732                 /* set the private key from KeyFile */
2733                 if (SSL_CTX_use_PrivateKey_file(context->ssl_ctx,
2734                              ssl_private_key_filepath, SSL_FILETYPE_PEM) != 1) {
2735                         fprintf(stderr, "ssl problem getting key '%s': %s\n",
2736                                                 ssl_private_key_filepath,
2737                                 ERR_error_string(ERR_get_error(), ssl_err_buf));
2738                         return NULL;
2739                 }
2740                 /* verify private key */
2741                 if (!SSL_CTX_check_private_key(context->ssl_ctx)) {
2742                         fprintf(stderr, "Private SSL key doesn't match cert\n");
2743                         return NULL;
2744                 }
2745
2746                 /* SSL is happy and has a cert it's content with */
2747         }
2748 #endif
2749
2750         /* selftest */
2751
2752         if (lws_b64_selftest())
2753                 return NULL;
2754
2755         /* fd hashtable init */
2756
2757         for (n = 0; n < FD_HASHTABLE_MODULUS; n++)
2758                 context->fd_hashtable[n].length = 0;
2759
2760         /* set up our external listening socket we serve on */
2761
2762         if (port) {
2763
2764                 sockfd = socket(AF_INET, SOCK_STREAM, 0);
2765                 if (sockfd < 0) {
2766                         fprintf(stderr, "ERROR opening socket");
2767                         return NULL;
2768                 }
2769
2770                 /* allow us to restart even if old sockets in TIME_WAIT */
2771                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (const void *)&opt, sizeof(opt));
2772
2773
2774                 /* Disable Nagle */
2775                 opt = 1;
2776                 setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, (const void *)&opt, sizeof(opt));
2777
2778                 bzero((char *) &serv_addr, sizeof(serv_addr));
2779                 serv_addr.sin_family = AF_INET;
2780                 if (interf == NULL)
2781                         serv_addr.sin_addr.s_addr = INADDR_ANY;
2782                 else
2783                         interface_to_sa(interf, &serv_addr,
2784                                                 sizeof(serv_addr));
2785                 serv_addr.sin_port = htons(port);
2786
2787                 n = bind(sockfd, (struct sockaddr *) &serv_addr,
2788                                                              sizeof(serv_addr));
2789                 if (n < 0) {
2790                         fprintf(stderr, "ERROR on binding to port %d (%d %d)\n",
2791                                                                 port, n, errno);
2792                         return NULL;
2793                 }
2794
2795                 wsi = malloc(sizeof(struct libwebsocket));
2796                 memset(wsi, 0, sizeof (struct libwebsocket));
2797                 wsi->sock = sockfd;
2798                 wsi->count_active_extensions = 0;
2799                 wsi->mode = LWS_CONNMODE_SERVER_LISTENER;
2800                 insert_wsi(context, wsi);
2801
2802                 listen(sockfd, 5);
2803                 fprintf(stderr, " Listening on port %d\n", port);
2804
2805                 /* list in the internal poll array */
2806
2807                 context->fds[context->fds_count].fd = sockfd;
2808                 context->fds[context->fds_count++].events = POLLIN;
2809
2810                 /* external POLL support via protocol 0 */
2811                 context->protocols[0].callback(context, wsi,
2812                         LWS_CALLBACK_ADD_POLL_FD,
2813                         (void *)(long)sockfd, NULL, POLLIN);
2814
2815         }
2816
2817         /* drop any root privs for this process */
2818 #ifdef WIN32
2819 #else
2820         if (gid != -1)
2821                 if (setgid(gid))
2822                         fprintf(stderr, "setgid: %s\n", strerror(errno));
2823         if (uid != -1)
2824                 if (setuid(uid))
2825                         fprintf(stderr, "setuid: %s\n", strerror(errno));
2826 #endif
2827
2828         /* set up our internal broadcast trigger sockets per-protocol */
2829
2830         for (context->count_protocols = 0;
2831                         protocols[context->count_protocols].callback;
2832                                                    context->count_protocols++) {
2833
2834                 fprintf(stderr, "  Protocol: %s\n", protocols[context->count_protocols].name);
2835
2836                 protocols[context->count_protocols].owning_server = context;
2837                 protocols[context->count_protocols].protocol_index =
2838                                                        context->count_protocols;
2839
2840                 fd = socket(AF_INET, SOCK_STREAM, 0);
2841                 if (fd < 0) {
2842                         fprintf(stderr, "ERROR opening socket");
2843                         return NULL;
2844                 }
2845
2846                 /* allow us to restart even if old sockets in TIME_WAIT */
2847                 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const void *)&opt, sizeof(opt));
2848
2849                 bzero((char *) &serv_addr, sizeof(serv_addr));
2850                 serv_addr.sin_family = AF_INET;
2851                 serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
2852                 serv_addr.sin_port = 0; /* pick the port for us */
2853
2854                 n = bind(fd, (struct sockaddr *) &serv_addr, sizeof(serv_addr));
2855                 if (n < 0) {
2856                         fprintf(stderr, "ERROR on binding to port %d (%d %d)\n",
2857                                                                 port, n, errno);
2858                         return NULL;
2859                 }
2860
2861                 slen = sizeof cli_addr;
2862                 n = getsockname(fd, (struct sockaddr *)&cli_addr, &slen);
2863                 if (n < 0) {
2864                         fprintf(stderr, "getsockname failed\n");
2865                         return NULL;
2866                 }
2867                 protocols[context->count_protocols].broadcast_socket_port =
2868                                                        ntohs(cli_addr.sin_port);
2869                 listen(fd, 5);
2870
2871                 debug("  Protocol %s broadcast socket %d\n",
2872                                 protocols[context->count_protocols].name,
2873                                                       ntohs(cli_addr.sin_port));
2874
2875                 /* dummy wsi per broadcast proxy socket */
2876
2877                 wsi = malloc(sizeof(struct libwebsocket));
2878                 memset(wsi, 0, sizeof (struct libwebsocket));
2879                 wsi->sock = fd;
2880                 wsi->mode = LWS_CONNMODE_BROADCAST_PROXY_LISTENER;
2881                 wsi->count_active_extensions = 0;
2882                 /* note which protocol we are proxying */
2883                 wsi->protocol_index_for_broadcast_proxy =
2884                                                        context->count_protocols;
2885                 insert_wsi(context, wsi);
2886
2887                 /* list in internal poll array */
2888
2889                 context->fds[context->fds_count].fd = fd;
2890                 context->fds[context->fds_count].events = POLLIN;
2891                 context->fds[context->fds_count].revents = 0;
2892                 context->fds_count++;
2893
2894                 /* external POLL support via protocol 0 */
2895                 context->protocols[0].callback(context, wsi,
2896                         LWS_CALLBACK_ADD_POLL_FD,
2897                         (void *)(long)fd, NULL, POLLIN);
2898         }
2899
2900         /*
2901          * give all extensions a chance to create any per-context
2902          * allocations they need
2903          */
2904
2905         m = LWS_EXT_CALLBACK_CLIENT_CONTEXT_CONSTRUCT;
2906         if (port)
2907                 m = LWS_EXT_CALLBACK_SERVER_CONTEXT_CONSTRUCT;
2908         while (extensions->callback) {
2909                 fprintf(stderr, "  Extension: %s\n", extensions->name);
2910                 extensions->callback(context, extensions,
2911                                                         NULL, m, NULL, NULL, 0);
2912                 extensions++;
2913         }
2914
2915         return context;
2916 }
2917
2918
2919 #ifndef LWS_NO_FORK
2920
2921 /**
2922  * libwebsockets_fork_service_loop() - Optional helper function forks off
2923  *                                a process for the websocket server loop.
2924  *                              You don't have to use this but if not, you
2925  *                              have to make sure you are calling
2926  *                              libwebsocket_service periodically to service
2927  *                              the websocket traffic
2928  * @context:    server context returned by creation function
2929  */
2930
2931 int
2932 libwebsockets_fork_service_loop(struct libwebsocket_context *context)
2933 {
2934         int fd;
2935         struct sockaddr_in cli_addr;
2936         int n;
2937         int p;
2938
2939         n = fork();
2940         if (n < 0)
2941                 return n;
2942
2943         if (!n) {
2944
2945                 /* main process context */
2946
2947                 /*
2948                  * set up the proxy sockets to allow broadcast from
2949                  * service process context
2950                  */
2951
2952                 for (p = 0; p < context->count_protocols; p++) {
2953                         fd = socket(AF_INET, SOCK_STREAM, 0);
2954                         if (fd < 0) {
2955                                 fprintf(stderr, "Unable to create socket\n");
2956                                 return -1;
2957                         }
2958                         cli_addr.sin_family = AF_INET;
2959                         cli_addr.sin_port = htons(
2960                              context->protocols[p].broadcast_socket_port);
2961                         cli_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
2962                         n = connect(fd, (struct sockaddr *)&cli_addr,
2963                                                                sizeof cli_addr);
2964                         if (n < 0) {
2965                                 fprintf(stderr, "Unable to connect to "
2966                                                 "broadcast socket %d, %s\n",
2967                                                 n, strerror(errno));
2968                                 return -1;
2969                         }
2970
2971                         context->protocols[p].broadcast_socket_user_fd = fd;
2972                 }
2973
2974                 return 0;
2975         }
2976
2977         /* we want a SIGHUP when our parent goes down */
2978         prctl(PR_SET_PDEATHSIG, SIGHUP);
2979
2980         /* in this forked process, sit and service websocket connections */
2981
2982         while (1)
2983                 if (libwebsocket_service(context, 1000))
2984                         return -1;
2985
2986         return 0;
2987 }
2988
2989 #endif
2990
2991 /**
2992  * libwebsockets_get_protocol() - Returns a protocol pointer from a websocket
2993  *                                connection.
2994  * @wsi:        pointer to struct websocket you want to know the protocol of
2995  *
2996  *
2997  *      This is useful to get the protocol to broadcast back to from inside
2998  * the callback.
2999  */
3000
3001 const struct libwebsocket_protocols *
3002 libwebsockets_get_protocol(struct libwebsocket *wsi)
3003 {
3004         return wsi->protocol;
3005 }
3006
3007 /**
3008  * libwebsockets_broadcast() - Sends a buffer to the callback for all active
3009  *                                connections of the given protocol.
3010  * @protocol:   pointer to the protocol you will broadcast to all members of
3011  * @buf:  buffer containing the data to be broadcase.  NOTE: this has to be
3012  *              allocated with LWS_SEND_BUFFER_PRE_PADDING valid bytes before
3013  *              the pointer and LWS_SEND_BUFFER_POST_PADDING afterwards in the
3014  *              case you are calling this function from callback context.
3015  * @len:        length of payload data in buf, starting from buf.
3016  *
3017  *      This function allows bulk sending of a packet to every connection using
3018  * the given protocol.  It does not send the data directly; instead it calls
3019  * the callback with a reason type of LWS_CALLBACK_BROADCAST.  If the callback
3020  * wants to actually send the data for that connection, the callback itself
3021  * should call libwebsocket_write().
3022  *
3023  * libwebsockets_broadcast() can be called from another fork context without
3024  * having to take any care about data visibility between the processes, it'll
3025  * "just work".
3026  */
3027
3028
3029 int
3030 libwebsockets_broadcast(const struct libwebsocket_protocols *protocol,
3031                                                  unsigned char *buf, size_t len)
3032 {
3033         struct libwebsocket_context *context = protocol->owning_server;
3034         int n;
3035         int m;
3036         struct libwebsocket * wsi;
3037
3038         if (!protocol->broadcast_socket_user_fd) {
3039                 /*
3040                  * We are either running unforked / flat, or we are being
3041                  * called from poll thread context
3042                  * eg, from a callback.  In that case don't use sockets for
3043                  * broadcast IPC (since we can't open a socket connection to
3044                  * a socket listening on our own thread) but directly do the
3045                  * send action.
3046                  *
3047                  * Locking is not needed because we are by definition being
3048                  * called in the poll thread context and are serialized.
3049                  */
3050
3051                 for (n = 0; n < FD_HASHTABLE_MODULUS; n++) {
3052
3053                         for (m = 0; m < context->fd_hashtable[n].length; m++) {
3054
3055                                 wsi = context->fd_hashtable[n].wsi[m];
3056
3057                                 if (wsi->mode != LWS_CONNMODE_WS_SERVING)
3058                                         continue;
3059
3060                                 /*
3061                                  * never broadcast to
3062                                  * non-established connections
3063                                  */
3064                                 if (wsi->state != WSI_STATE_ESTABLISHED)
3065                                         continue;
3066
3067                                 /* only broadcast to guys using
3068                                  * requested protocol
3069                                  */
3070                                 if (wsi->protocol != protocol)
3071                                         continue;
3072
3073                                 wsi->protocol->callback(context, wsi,
3074                                          LWS_CALLBACK_BROADCAST,
3075                                          wsi->user_space,
3076                                          buf, len);
3077                         }
3078                 }
3079
3080                 return 0;
3081         }
3082
3083         /*
3084          * We're being called from a different process context than the server
3085          * loop.  Instead of broadcasting directly, we send our
3086          * payload on a socket to do the IPC; the server process will serialize
3087          * the broadcast action in its main poll() loop.
3088          *
3089          * There's one broadcast socket listening for each protocol supported
3090          * set up when the websocket server initializes
3091          */
3092
3093         n = send(protocol->broadcast_socket_user_fd, buf, len, MSG_NOSIGNAL);
3094
3095         return n;
3096 }
3097
3098 int
3099 libwebsocket_is_final_fragment(struct libwebsocket *wsi)
3100 {
3101         return wsi->final;
3102 }
3103
3104 void *
3105 libwebsocket_ensure_user_space(struct libwebsocket *wsi)
3106 {
3107         /* allocate the per-connection user memory (if any) */
3108
3109         if (wsi->protocol->per_session_data_size && !wsi->user_space) {
3110                 wsi->user_space = malloc(
3111                                   wsi->protocol->per_session_data_size);
3112                 if (wsi->user_space  == NULL) {
3113                         fprintf(stderr, "Out of memory for "
3114                                                    "conn user space\n");
3115                         return NULL;
3116                 }
3117                 memset(wsi->user_space, 0, wsi->protocol->per_session_data_size);
3118         }
3119         return wsi->user_space;
3120 }