lib/context.c

   1 /*
   2  * libwebsockets - small server side websockets and web server implementation
   3  *
   4  * Copyright (C) 2010-2015 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 #ifndef LWS_BUILD_HASH
  25 #define LWS_BUILD_HASH "unknown-build-hash"
  26 #endif
  27
  28 static const char *library_version = LWS_LIBRARY_VERSION " " LWS_BUILD_HASH;
  29
  30 /**
  31  * lws_get_library_version: get version and git hash library built from
  32  *
  33  *      returns a const char * to a string like "1.1 178d78c"
  34  *      representing the library version followed by the git head hash it
  35  *      was built from
  36  */
  37 LWS_VISIBLE const char *
  38 lws_get_library_version(void)
  39 {
  40         return library_version;
  41 }
  42
  43 static const char * const mount_protocols[] = {
  44         "http://",
  45         "https://",
  46         "file://",
  47         "cgi://",
  48         ">http://",
  49         ">https://",
  50 };
  51
  52 LWS_VISIBLE void *
  53 lws_protocol_vh_priv_zalloc(struct lws_vhost *vhost, const struct lws_protocols *prot,
  54                             int size)
  55 {
  56         int n = 0;
  57
  58         /* allocate the vh priv array only on demand */
  59         if (!vhost->protocol_vh_privs) {
  60                 vhost->protocol_vh_privs = (void **)lws_zalloc(
  61                                 vhost->count_protocols * sizeof(void *));
  62                 if (!vhost->protocol_vh_privs)
  63                         return NULL;
  64         }
  65
  66         while (n < vhost->count_protocols && &vhost->protocols[n] != prot)
  67                 n++;
  68
  69         if (n == vhost->count_protocols)
  70                 return NULL;
  71
  72         vhost->protocol_vh_privs[n] = lws_zalloc(size);
  73         return vhost->protocol_vh_privs[n];
  74 }
  75
  76 LWS_VISIBLE void *
  77 lws_protocol_vh_priv_get(struct lws_vhost *vhost, const struct lws_protocols *prot)
  78 {
  79         int n = 0;
  80
  81         if (!vhost->protocol_vh_privs)
  82                 return NULL;
  83
  84         while (n < vhost->count_protocols && &vhost->protocols[n] != prot)
  85                 n++;
  86
  87         if (n == vhost->count_protocols) {
  88                 lwsl_err("%s: unknown protocol %p\n", __func__, prot);
  89                 return NULL;
  90         }
  91
  92         return vhost->protocol_vh_privs[n];
  93 }
  94
  95 static const struct lws_protocol_vhost_options *
  96 lws_vhost_protocol_options(struct lws_vhost *vh, const char *name)
  97 {
  98         const struct lws_protocol_vhost_options *pvo = vh->pvo;
  99
 100         while (pvo) {
 101                 // lwsl_notice("%s: '%s' '%s'\n", __func__, pvo->name, name);
 102                 if (!strcmp(pvo->name, name))
 103                         return pvo;
 104                 pvo = pvo->next;
 105         }
 106
 107         return NULL;
 108 }
 109
 110 int
 111 lws_protocol_init(struct lws_context *context)
 112 {
 113         struct lws_vhost *vh = context->vhost_list;
 114         const struct lws_protocol_vhost_options *pvo;
 115         struct lws wsi;
 116         int n;
 117
 118         memset(&wsi, 0, sizeof(wsi));
 119         wsi.context = context;
 120
 121         while (vh) {
 122                 wsi.vhost = vh;
 123
 124                 /* initialize supported protocols on this vhost */
 125
 126                 for (n = 0; n < vh->count_protocols; n++) {
 127                         wsi.protocol = &vh->protocols[n];
 128
 129                         pvo = lws_vhost_protocol_options(vh,
 130                                                          vh->protocols[n].name);
 131                         if (pvo)
 132                                 /*
 133                                  * linked list of options specific to
 134                                  * vh + protocol
 135                                  */
 136                                 pvo = pvo->options;
 137
 138                         /*
 139                          * inform all the protocols that they are doing their one-time
 140                          * initialization if they want to.
 141                          *
 142                          * NOTE the wsi is all zeros except for the context, vh and
 143                          * protocol ptrs so lws_get_context(wsi) etc can work
 144                          */
 145                         vh->protocols[n].callback(&wsi,
 146                                 LWS_CALLBACK_PROTOCOL_INIT, NULL,
 147                                 (void *)pvo, 0);
 148                 }
 149
 150                 vh = vh->vhost_next;
 151         }
 152
 153         context->protocol_init_done = 1;
 154
 155         return 0;
 156 }
 157
 158 static int callback_http_dummy(
 159                 struct lws *wsi, enum lws_callback_reasons reason, void *user,
 160                   void *in, size_t len)
 161 {
 162         return 0;
 163 }
 164
 165 /* list of supported protocols and callbacks */
 166
 167 static const struct lws_protocols protocols_dummy[] = {
 168         /* first protocol must always be HTTP handler */
 169
 170         {
 171                 "http-only",            /* name */
 172                 callback_http_dummy,            /* callback */
 173                 0,      /* per_session_data_size */
 174                 0,                      /* max frame size / rx buffer */
 175         },
 176         /*
 177          * the other protocols are provided by lws plugins
 178          */
 179         { NULL, NULL, 0, 0 } /* terminator */
 180 };
 181
 182 LWS_VISIBLE struct lws_vhost *
 183 lws_create_vhost(struct lws_context *context,
 184                  struct lws_context_creation_info *info)
 185 {
 186         struct lws_vhost *vh = lws_zalloc(sizeof(*vh)),
 187                          **vh1 = &context->vhost_list;
 188         const struct lws_http_mount *mounts;
 189 #ifdef LWS_WITH_PLUGINS
 190         struct lws_plugin *plugin = context->plugin_list;
 191         struct lws_protocols *lwsp;
 192         int m, n, f = !info->pvo;
 193 #endif
 194         char *p;
 195
 196         if (!vh)
 197                 return NULL;
 198
 199         if (!info->protocols)
 200                 info->protocols = &protocols_dummy[0];
 201
 202         vh->context = context;
 203         if (!info->vhost_name)
 204                 vh->name = "default";
 205         else
 206                 vh->name = info->vhost_name;
 207
 208         vh->iface = info->iface;
 209         for (vh->count_protocols = 0;
 210              info->protocols[vh->count_protocols].callback;
 211              vh->count_protocols++)
 212                 ;
 213
 214         vh->options = info->options;
 215         vh->pvo = info->pvo;
 216         vh->keepalive_timeout = info->keepalive_timeout;
 217
 218 #ifdef LWS_WITH_PLUGINS
 219         if (plugin) {
 220                 /*
 221                  * give the vhost a unified list of protocols including the
 222                  * ones that came from plugins
 223                  */
 224                 lwsp = lws_zalloc(sizeof(struct lws_protocols) *
 225                                            (vh->count_protocols +
 226                                            context->plugin_protocol_count + 1));
 227                 if (!lwsp)
 228                         return NULL;
 229
 230                 m = vh->count_protocols;
 231                 memcpy(lwsp, info->protocols,
 232                        sizeof(struct lws_protocols) * m);
 233
 234                 /* for compatibility, all protocols enabled on vhost if only
 235                  * the default vhost exists.  Otherwise only vhosts who ask
 236                  * for a protocol get it enabled.
 237                  */
 238
 239                 if (info->options & LWS_SERVER_OPTION_EXPLICIT_VHOSTS)
 240                         f = 0;
 241
 242                 while (plugin) {
 243                         for (n = 0; n < plugin->caps.count_protocols; n++) {
 244                                 /*
 245                                  * for compatibility's sake, no pvo implies
 246                                  * allow all protocols
 247                                  */
 248                                 if (f || lws_vhost_protocol_options(vh,
 249                                     plugin->caps.protocols[n].name)) {
 250                                         memcpy(&lwsp[m],
 251                                                &plugin->caps.protocols[n],
 252                                                sizeof(struct lws_protocols));
 253                                         m++;
 254                                         vh->count_protocols++;
 255                                 }
 256                         }
 257                         plugin = plugin->list;
 258                 }
 259                 vh->protocols = lwsp;
 260         } else
 261 #endif
 262                 vh->protocols = info->protocols;
 263
 264         vh->same_vh_protocol_list = (struct lws **)
 265                         lws_zalloc(sizeof(struct lws *) * vh->count_protocols);
 266
 267         vh->mount_list = info->mounts;
 268
 269 #ifdef LWS_USE_UNIX_SOCK
 270         if (LWS_UNIX_SOCK_ENABLED(context)) {
 271                 lwsl_notice("Creating Vhost '%s' path \"%s\", %d protocols\n",
 272                                 vh->name, info->iface, vh->count_protocols);
 273         } else
 274 #endif
 275         lwsl_notice("Creating Vhost '%s' port %d, %d protocols\n",
 276                         vh->name, info->port, vh->count_protocols);
 277
 278         mounts = info->mounts;
 279         while (mounts) {
 280                 lwsl_notice("   mounting %s%s to %s\n",
 281                                 mount_protocols[mounts->origin_protocol],
 282                                 mounts->origin, mounts->mountpoint);
 283                 mounts = mounts->mount_next;
 284         }
 285
 286 #ifndef LWS_NO_EXTENSIONS
 287 #ifdef LWS_WITH_PLUGINS
 288         if (context->plugin_extension_count) {
 289
 290                 m = 0;
 291                 while (info->extensions && info->extensions[m].callback)
 292                         m++;
 293
 294                 /*
 295                  * give the vhost a unified list of extensions including the
 296                  * ones that came from plugins
 297                  */
 298                 vh->extensions = lws_zalloc(sizeof(struct lws_extension) *
 299                                            (m +
 300                                            context->plugin_extension_count + 1));
 301                 if (!vh->extensions)
 302                         return NULL;
 303
 304                 memcpy((struct lws_extension *)vh->extensions, info->extensions,
 305                        sizeof(struct lws_extension) * m);
 306                 plugin = context->plugin_list;
 307                 while (plugin) {
 308                         memcpy((struct lws_extension *)&vh->extensions[m],
 309                                 plugin->caps.extensions,
 310                                sizeof(struct lws_extension) *
 311                                plugin->caps.count_extensions);
 312                         m += plugin->caps.count_extensions;
 313                         plugin = plugin->list;
 314                 }
 315         } else
 316 #endif
 317                 vh->extensions = info->extensions;
 318 #endif
 319
 320         vh->listen_port = info->port;
 321         vh->http_proxy_port = 0;
 322         vh->http_proxy_address[0] = '\0';
 323
 324         /* either use proxy from info, or try get it from env var */
 325
 326         if (info->http_proxy_address) {
 327                 /* override for backwards compatibility */
 328                 if (info->http_proxy_port)
 329                         vh->http_proxy_port = info->http_proxy_port;
 330                 lws_set_proxy(vh, info->http_proxy_address);
 331         } else {
 332 #ifdef LWS_HAVE_GETENV
 333                 p = getenv("http_proxy");
 334                 if (p)
 335                         lws_set_proxy(vh, p);
 336 #endif
 337         }
 338
 339         vh->ka_time = info->ka_time;
 340         vh->ka_interval = info->ka_interval;
 341         vh->ka_probes = info->ka_probes;
 342
 343         if (vh->options & LWS_SERVER_OPTION_STS)
 344                 lwsl_notice("   STS enabled\n");
 345
 346 #ifdef LWS_WITH_ACCESS_LOG
 347         if (info->log_filepath) {
 348                 vh->log_fd = open(info->log_filepath, O_CREAT | O_APPEND | O_RDWR, 0600);
 349                 if (vh->log_fd == LWS_INVALID_FILE) {
 350                         lwsl_err("unable to open log filepath %s\n",
 351                                  info->log_filepath);
 352                         goto bail;
 353                 }
 354                 if (context->uid != -1)
 355                         if (chown(info->log_filepath, context->uid,
 356                                   context->gid) == -1)
 357                                 lwsl_err("unable to chown log file %s\n",
 358                                                 info->log_filepath);
 359         } else
 360                 vh->log_fd = LWS_INVALID_FILE;
 361 #endif
 362
 363         if (lws_context_init_server_ssl(info, vh))
 364                 goto bail;
 365
 366         if (lws_context_init_client_ssl(info, vh))
 367                 goto bail;
 368
 369         if (lws_context_init_server(info, vh))
 370                 goto bail;
 371
 372         while (1) {
 373                 if (!(*vh1)) {
 374                         *vh1 = vh;
 375                         break;
 376                 }
 377                 vh1 = &(*vh1)->vhost_next;
 378         };
 379
 380         return vh;
 381
 382 bail:
 383         lws_free(vh);
 384
 385         return NULL;
 386 }
 387
 388 /**
 389  * lws_create_context() - Create the websocket handler
 390  * @info:       pointer to struct with parameters
 391  *
 392  *      This function creates the listening socket (if serving) and takes care
 393  *      of all initialization in one step.
 394  *
 395  *      After initialization, it returns a struct lws_context * that
 396  *      represents this server.  After calling, user code needs to take care
 397  *      of calling lws_service() with the context pointer to get the
 398  *      server's sockets serviced.  This must be done in the same process
 399  *      context as the initialization call.
 400  *
 401  *      The protocol callback functions are called for a handful of events
 402  *      including http requests coming in, websocket connections becoming
 403  *      established, and data arriving; it's also called periodically to allow
 404  *      async transmission.
 405  *
 406  *      HTTP requests are sent always to the FIRST protocol in @protocol, since
 407  *      at that time websocket protocol has not been negotiated.  Other
 408  *      protocols after the first one never see any HTTP callack activity.
 409  *
 410  *      The server created is a simple http server by default; part of the
 411  *      websocket standard is upgrading this http connection to a websocket one.
 412  *
 413  *      This allows the same server to provide files like scripts and favicon /
 414  *      images or whatever over http and dynamic data over websockets all in
 415  *      one place; they're all handled in the user callback.
 416  */
 417 LWS_VISIBLE struct lws_context *
 418 lws_create_context(struct lws_context_creation_info *info)
 419 {
 420         struct lws_context *context = NULL;
 421         struct lws wsi;
 422 #ifndef LWS_NO_DAEMONIZE
 423         int pid_daemon = get_daemonize_pid();
 424 #endif
 425         int n, m;
 426 #if defined(__ANDROID__)
 427         struct rlimit rt;
 428 #endif
 429
 430         lwsl_notice("Initial logging level %d\n", log_level);
 431         lwsl_notice("Libwebsockets version: %s\n", library_version);
 432 #if LWS_POSIX
 433 #ifdef LWS_USE_IPV6
 434         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_DISABLE_IPV6))
 435                 lwsl_notice("IPV6 compiled in and enabled\n");
 436         else
 437                 lwsl_notice("IPV6 compiled in but disabled\n");
 438 #else
 439         lwsl_notice("IPV6 not compiled in\n");
 440 #endif
 441         lws_feature_status_libev(info);
 442         lws_feature_status_libuv(info);
 443 #endif
 444         lwsl_info(" LWS_DEF_HEADER_LEN    : %u\n", LWS_DEF_HEADER_LEN);
 445         lwsl_info(" LWS_MAX_PROTOCOLS     : %u\n", LWS_MAX_PROTOCOLS);
 446         lwsl_info(" LWS_MAX_SMP           : %u\n", LWS_MAX_SMP);
 447         lwsl_info(" SPEC_LATEST_SUPPORTED : %u\n", SPEC_LATEST_SUPPORTED);
 448         lwsl_info(" sizeof (*info)        : %u\n", sizeof(*info));
 449 #if LWS_POSIX
 450         lwsl_info(" SYSTEM_RANDOM_FILEPATH: '%s'\n", SYSTEM_RANDOM_FILEPATH);
 451 #endif
 452         if (lws_plat_context_early_init())
 453                 return NULL;
 454
 455         context = lws_zalloc(sizeof(struct lws_context));
 456         if (!context) {
 457                 lwsl_err("No memory for websocket context\n");
 458                 return NULL;
 459         }
 460
 461         context->time_up = time(NULL);
 462 #ifndef LWS_NO_DAEMONIZE
 463         if (pid_daemon) {
 464                 context->started_with_parent = pid_daemon;
 465                 lwsl_notice(" Started with daemon pid %d\n", pid_daemon);
 466         }
 467 #endif
 468 #if defined(__ANDROID__)
 469                 n = getrlimit ( RLIMIT_NOFILE,&rt);
 470                 if (-1 == n) {
 471                         lwsl_err("Get RLIMIT_NOFILE failed!\n");
 472                         return NULL;
 473                 }
 474                 context->max_fds = rt.rlim_cur;
 475 #else
 476                 context->max_fds = getdtablesize();
 477 #endif
 478
 479         if (info->count_threads)
 480                 context->count_threads = info->count_threads;
 481         else
 482                 context->count_threads = 1;
 483
 484         if (context->count_threads > LWS_MAX_SMP)
 485                 context->count_threads = LWS_MAX_SMP;
 486
 487         context->token_limits = info->token_limits;
 488
 489         context->options = info->options;
 490
 491         if (info->timeout_secs)
 492                 context->timeout_secs = info->timeout_secs;
 493         else
 494                 context->timeout_secs = AWAITING_TIMEOUT;
 495
 496         lwsl_info(" default timeout (secs): %u\n", context->timeout_secs);
 497
 498         if (info->max_http_header_data)
 499                 context->max_http_header_data = info->max_http_header_data;
 500         else
 501                 context->max_http_header_data = LWS_DEF_HEADER_LEN;
 502         if (info->max_http_header_pool)
 503                 context->max_http_header_pool = info->max_http_header_pool;
 504         else
 505                 context->max_http_header_pool = LWS_DEF_HEADER_POOL;
 506
 507         /*
 508          * Allocate the per-thread storage for scratchpad buffers,
 509          * and header data pool
 510          */
 511         for (n = 0; n < context->count_threads; n++) {
 512                 context->pt[n].serv_buf = lws_zalloc(LWS_MAX_SOCKET_IO_BUF);
 513                 if (!context->pt[n].serv_buf) {
 514                         lwsl_err("OOM\n");
 515                         return NULL;
 516                 }
 517
 518                 context->pt[n].context = context;
 519                 context->pt[n].tid = n;
 520                 context->pt[n].http_header_data = lws_malloc(context->max_http_header_data *
 521                                                        context->max_http_header_pool);
 522                 if (!context->pt[n].http_header_data)
 523                         goto bail;
 524
 525                 context->pt[n].ah_pool = lws_zalloc(sizeof(struct allocated_headers) *
 526                                               context->max_http_header_pool);
 527                 for (m = 0; m < context->max_http_header_pool; m++)
 528                         context->pt[n].ah_pool[m].data =
 529                                 (char *)context->pt[n].http_header_data +
 530                                 (m * context->max_http_header_data);
 531                 if (!context->pt[n].ah_pool)
 532                         goto bail;
 533
 534                 lws_pt_mutex_init(&context->pt[n]);
 535         }
 536
 537         if (info->fd_limit_per_thread)
 538                 context->fd_limit_per_thread = info->fd_limit_per_thread;
 539         else
 540                 context->fd_limit_per_thread = context->max_fds /
 541                                                context->count_threads;
 542
 543         lwsl_notice(" Threads: %d each %d fds\n", context->count_threads,
 544                     context->fd_limit_per_thread);
 545
 546         memset(&wsi, 0, sizeof(wsi));
 547         wsi.context = context;
 548
 549         if (!info->ka_interval && info->ka_time > 0) {
 550                 lwsl_err("info->ka_interval can't be 0 if ka_time used\n");
 551                 return NULL;
 552         }
 553
 554 #ifdef LWS_USE_LIBEV
 555         /* (Issue #264) In order to *avoid breaking backwards compatibility*, we
 556          * enable libev mediated SIGINT handling with a default handler of
 557          * lws_sigint_cb. The handler can be overridden or disabled
 558          * by invoking lws_sigint_cfg after creating the context, but
 559          * before invoking lws_initloop:
 560          */
 561         context->use_ev_sigint = 1;
 562         context->lws_ev_sigint_cb = &lws_ev_sigint_cb;
 563 #endif /* LWS_USE_LIBEV */
 564 #ifdef LWS_USE_LIBUV
 565         /* (Issue #264) In order to *avoid breaking backwards compatibility*, we
 566          * enable libev mediated SIGINT handling with a default handler of
 567          * lws_sigint_cb. The handler can be overridden or disabled
 568          * by invoking lws_sigint_cfg after creating the context, but
 569          * before invoking lws_initloop:
 570          */
 571         context->use_ev_sigint = 1;
 572         context->lws_uv_sigint_cb = &lws_uv_sigint_cb;
 573 #endif
 574
 575         lwsl_info(" mem: context:         %5u bytes (%d ctx + (%d thr x %d))\n",
 576                   sizeof(struct lws_context) +
 577                   (context->count_threads * LWS_MAX_SOCKET_IO_BUF),
 578                   sizeof(struct lws_context),
 579                   context->count_threads,
 580                   LWS_MAX_SOCKET_IO_BUF);
 581
 582         lwsl_info(" mem: http hdr rsvd:   %5u bytes (%u thr x (%u + %u) x %u))\n",
 583                     (context->max_http_header_data +
 584                      sizeof(struct allocated_headers)) *
 585                     context->max_http_header_pool * context->count_threads,
 586                     context->count_threads,
 587                     context->max_http_header_data,
 588                     sizeof(struct allocated_headers),
 589                     context->max_http_header_pool);
 590         n = sizeof(struct lws_pollfd) * context->count_threads *
 591             context->fd_limit_per_thread;
 592         context->pt[0].fds = lws_zalloc(n);
 593         if (context->pt[0].fds == NULL) {
 594                 lwsl_err("OOM allocating %d fds\n", context->max_fds);
 595                 goto bail;
 596         }
 597         lwsl_info(" mem: pollfd map:      %5u\n", n);
 598
 599         if (info->server_string) {
 600                 context->server_string = info->server_string;
 601                 context->server_string_len = strlen(context->server_string);
 602         } else {
 603                 context->server_string = "libwebsockets";
 604                 context->server_string_len = 13;
 605         }
 606
 607 #if LWS_MAX_SMP > 1
 608         /* each thread serves his own chunk of fds */
 609         for (n = 1; n < (int)info->count_threads; n++)
 610                 context->pt[n].fds = context->pt[n - 1].fds +
 611                                      context->fd_limit_per_thread;
 612 #endif
 613
 614         if (lws_plat_init(context, info))
 615                 goto bail;
 616
 617         lws_context_init_ssl_library(info);
 618
 619         context->user_space = info->user;
 620
 621         /*
 622          * if he's not saying he'll make his own vhosts later then act
 623          * compatibly and make a default vhost using the data in the info
 624          */
 625         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
 626                 if (!lws_create_vhost(context, info)) {
 627                         lwsl_err("Failed to create default vhost\n");
 628                         return NULL;
 629                 }
 630
 631         lws_context_init_extensions(info, context);
 632
 633         lwsl_notice(" mem: per-conn:        %5u bytes + protocol rx buf\n",
 634                     sizeof(struct lws));
 635
 636         strcpy(context->canonical_hostname, "unknown");
 637         lws_server_get_canonical_hostname(context, info);
 638
 639         context->uid = info->uid;
 640         context->gid = info->gid;
 641
 642         /*
 643          * drop any root privs for this process
 644          * to listen on port < 1023 we would have needed root, but now we are
 645          * listening, we don't want the power for anything else
 646          */
 647         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
 648                 lws_plat_drop_app_privileges(info);
 649
 650         /*
 651          * give all extensions a chance to create any per-context
 652          * allocations they need
 653          */
 654         if (info->port != CONTEXT_PORT_NO_LISTEN) {
 655                 if (lws_ext_cb_all_exts(context, NULL,
 656                         LWS_EXT_CB_SERVER_CONTEXT_CONSTRUCT, NULL, 0) < 0)
 657                         goto bail;
 658         } else
 659                 if (lws_ext_cb_all_exts(context, NULL,
 660                         LWS_EXT_CB_CLIENT_CONTEXT_CONSTRUCT, NULL, 0) < 0)
 661                         goto bail;
 662
 663         return context;
 664
 665 bail:
 666         lws_context_destroy(context);
 667         return NULL;
 668 }
 669
 670 /**
 671  * lws_context_destroy() - Destroy the websocket context
 672  * @context:    Websocket context
 673  *
 674  *      This function closes any active connections and then frees the
 675  *      context.  After calling this, any further use of the context is
 676  *      undefined.
 677  */
 678 LWS_VISIBLE void
 679 lws_context_destroy(struct lws_context *context)
 680 {
 681         const struct lws_protocols *protocol = NULL;
 682         struct lws_context_per_thread *pt;
 683         struct lws_vhost *vh, *vh1;
 684         struct lws wsi;
 685         int n, m;
 686
 687         lwsl_notice("%s\n", __func__);
 688
 689         if (!context)
 690                 return;
 691
 692         m = context->count_threads;
 693         context->being_destroyed = 1;
 694
 695         memset(&wsi, 0, sizeof(wsi));
 696         wsi.context = context;
 697
 698 #ifdef LWS_LATENCY
 699         if (context->worst_latency_info[0])
 700                 lwsl_notice("Worst latency: %s\n", context->worst_latency_info);
 701 #endif
 702
 703         while (m--) {
 704                 pt = &context->pt[m];
 705
 706                 for (n = 0; (unsigned int)n < context->pt[m].fds_count; n++) {
 707                         struct lws *wsi = wsi_from_fd(context, pt->fds[n].fd);
 708                         if (!wsi)
 709                                 continue;
 710
 711                         lws_close_free_wsi(wsi,
 712                                 LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY
 713                                 /* no protocol close */);
 714                         n--;
 715                 }
 716         }
 717         /*
 718          * give all extensions a chance to clean up any per-context
 719          * allocations they might have made
 720          */
 721
 722         n = lws_ext_cb_all_exts(context, NULL,
 723                                 LWS_EXT_CB_SERVER_CONTEXT_DESTRUCT, NULL, 0);
 724
 725         n = lws_ext_cb_all_exts(context, NULL,
 726                                 LWS_EXT_CB_CLIENT_CONTEXT_DESTRUCT, NULL, 0);
 727
 728         /*
 729          * inform all the protocols that they are done and will have no more
 730          * callbacks.
 731          *
 732          * We can't free things until after the event loop shuts down.
 733          */
 734         vh = context->vhost_list;
 735         while (vh) {
 736                 wsi.vhost = vh;
 737                 protocol = vh->protocols;
 738                 if (protocol) {
 739                         n = 0;
 740                         while (n < vh->count_protocols) {
 741                                 wsi.protocol = protocol;
 742                                 protocol->callback(&wsi, LWS_CALLBACK_PROTOCOL_DESTROY,
 743                                                    NULL, NULL, 0);
 744                                 protocol++;
 745                                 n++;
 746                         }
 747                 }
 748
 749                 vh = vh->vhost_next;
 750         }
 751
 752         for (n = 0; n < context->count_threads; n++) {
 753                 pt = &context->pt[n];
 754
 755                 lws_libev_destroyloop(context, n);
 756                 lws_libuv_destroyloop(context, n);
 757
 758                 lws_free_set_NULL(context->pt[n].serv_buf);
 759                 if (pt->ah_pool)
 760                         lws_free(pt->ah_pool);
 761                 if (pt->http_header_data)
 762                         lws_free(pt->http_header_data);
 763         }
 764         lws_plat_context_early_destroy(context);
 765         lws_ssl_context_destroy(context);
 766
 767         if (context->pt[0].fds)
 768                 lws_free_set_NULL(context->pt[0].fds);
 769
 770         /* free all the vhost allocations */
 771
 772         vh = context->vhost_list;
 773         while (vh) {
 774                 protocol = vh->protocols;
 775                 if (protocol) {
 776                         n = 0;
 777                         while (n < vh->count_protocols) {
 778                                 if (vh->protocol_vh_privs &&
 779                                     vh->protocol_vh_privs[n]) {
 780                                         lws_free(vh->protocol_vh_privs[n]);
 781                                         vh->protocol_vh_privs[n] = NULL;
 782                                 }
 783                                 protocol++;
 784                                 n++;
 785                         }
 786                 }
 787                 if (vh->protocol_vh_privs)
 788                         lws_free(vh->protocol_vh_privs);
 789                 lws_ssl_SSL_CTX_destroy(vh);
 790                 lws_free(vh->same_vh_protocol_list);
 791 #ifdef LWS_WITH_PLUGINS
 792                 if (context->plugin_list)
 793                         lws_free((void *)vh->protocols);
 794 #ifndef LWS_NO_EXTENSIONS
 795                 if (context->plugin_extension_count)
 796                         lws_free((void *)vh->extensions);
 797 #endif
 798 #endif
 799 #ifdef LWS_WITH_ACCESS_LOG
 800                 if (vh->log_fd != LWS_INVALID_FILE)
 801                         close(vh->log_fd);
 802 #endif
 803
 804                 vh1 = vh->vhost_next;
 805                 lws_free(vh);
 806                 vh = vh1;
 807         }
 808
 809         lws_plat_context_late_destroy(context);
 810
 811         lws_free(context);
 812 }