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         "callback://"
  51 };
  52
  53 LWS_VISIBLE void *
  54 lws_protocol_vh_priv_zalloc(struct lws_vhost *vhost, const struct lws_protocols *prot,
  55                             int size)
  56 {
  57         int n = 0;
  58
  59         /* allocate the vh priv array only on demand */
  60         if (!vhost->protocol_vh_privs) {
  61                 vhost->protocol_vh_privs = (void **)lws_zalloc(
  62                                 vhost->count_protocols * sizeof(void *));
  63                 if (!vhost->protocol_vh_privs)
  64                         return NULL;
  65         }
  66
  67         while (n < vhost->count_protocols && &vhost->protocols[n] != prot)
  68                 n++;
  69
  70         if (n == vhost->count_protocols)
  71                 return NULL;
  72
  73         vhost->protocol_vh_privs[n] = lws_zalloc(size);
  74         return vhost->protocol_vh_privs[n];
  75 }
  76
  77 LWS_VISIBLE void *
  78 lws_protocol_vh_priv_get(struct lws_vhost *vhost, const struct lws_protocols *prot)
  79 {
  80         int n = 0;
  81
  82         if (!vhost->protocol_vh_privs)
  83                 return NULL;
  84
  85         while (n < vhost->count_protocols && &vhost->protocols[n] != prot)
  86                 n++;
  87
  88         if (n == vhost->count_protocols) {
  89                 lwsl_err("%s: unknown protocol %p\n", __func__, prot);
  90                 return NULL;
  91         }
  92
  93         return vhost->protocol_vh_privs[n];
  94 }
  95
  96 static const struct lws_protocol_vhost_options *
  97 lws_vhost_protocol_options(struct lws_vhost *vh, const char *name)
  98 {
  99         const struct lws_protocol_vhost_options *pvo = vh->pvo;
 100
 101         while (pvo) {
 102                 // lwsl_notice("%s: '%s' '%s'\n", __func__, pvo->name, name);
 103                 if (!strcmp(pvo->name, name))
 104                         return pvo;
 105                 pvo = pvo->next;
 106         }
 107
 108         return NULL;
 109 }
 110
 111 int
 112 lws_protocol_init(struct lws_context *context)
 113 {
 114         struct lws_vhost *vh = context->vhost_list;
 115         const struct lws_protocol_vhost_options *pvo, *pvo1;
 116         struct lws wsi;
 117         int n;
 118
 119         memset(&wsi, 0, sizeof(wsi));
 120         wsi.context = context;
 121
 122         lwsl_notice("%s\n", __func__);
 123
 124         while (vh) {
 125                 wsi.vhost = vh;
 126
 127                 /* initialize supported protocols on this vhost */
 128
 129                 for (n = 0; n < vh->count_protocols; n++) {
 130                         wsi.protocol = &vh->protocols[n];
 131
 132                         pvo = lws_vhost_protocol_options(vh,
 133                                                          vh->protocols[n].name);
 134                         if (pvo) {
 135                                 /*
 136                                  * linked list of options specific to
 137                                  * vh + protocol
 138                                  */
 139                                 pvo1 = pvo;
 140                                 pvo = pvo1->options;
 141
 142                                 while (pvo) {
 143                                         lwsl_notice("    vh %s prot %s opt %s\n",
 144                                                         vh->name,
 145                                                         vh->protocols[n].name,
 146                                                         pvo->name);
 147
 148                                         if (!strcmp(pvo->name, "default")) {
 149                                                 lwsl_notice("Setting default "
 150                                                    "protocol for vh %s to %s\n",
 151                                                    vh->name,
 152                                                    vh->protocols[n].name);
 153                                                 vh->default_protocol_index = n;
 154                                         }
 155                                         pvo = pvo->next;
 156                                 }
 157
 158                                 pvo = pvo1->options;
 159                         }
 160
 161                         /*
 162                          * inform all the protocols that they are doing their one-time
 163                          * initialization if they want to.
 164                          *
 165                          * NOTE the wsi is all zeros except for the context, vh and
 166                          * protocol ptrs so lws_get_context(wsi) etc can work
 167                          */
 168                         vh->protocols[n].callback(&wsi,
 169                                 LWS_CALLBACK_PROTOCOL_INIT, NULL,
 170                                 (void *)pvo, 0);
 171                 }
 172
 173                 vh = vh->vhost_next;
 174         }
 175
 176         context->protocol_init_done = 1;
 177
 178         return 0;
 179 }
 180
 181 static int callback_http_dummy(
 182                 struct lws *wsi, enum lws_callback_reasons reason, void *user,
 183                   void *in, size_t len)
 184 {
 185         return 0;
 186 }
 187
 188 /* list of supported protocols and callbacks */
 189
 190 static const struct lws_protocols protocols_dummy[] = {
 191         /* first protocol must always be HTTP handler */
 192
 193         {
 194                 "http-only",            /* name */
 195                 callback_http_dummy,            /* callback */
 196                 0,      /* per_session_data_size */
 197                 0,                      /* max frame size / rx buffer */
 198         },
 199         /*
 200          * the other protocols are provided by lws plugins
 201          */
 202         { NULL, NULL, 0, 0 } /* terminator */
 203 };
 204
 205 LWS_VISIBLE struct lws_vhost *
 206 lws_create_vhost(struct lws_context *context,
 207                  struct lws_context_creation_info *info)
 208 {
 209         struct lws_vhost *vh = lws_zalloc(sizeof(*vh)),
 210                          **vh1 = &context->vhost_list;
 211         const struct lws_http_mount *mounts;
 212 #ifdef LWS_WITH_PLUGINS
 213         struct lws_plugin *plugin = context->plugin_list;
 214         struct lws_protocols *lwsp;
 215         int m, n, f = !info->pvo;
 216 #endif
 217         char *p;
 218
 219         if (!vh)
 220                 return NULL;
 221
 222         if (!info->protocols)
 223                 info->protocols = &protocols_dummy[0];
 224
 225         vh->context = context;
 226         if (!info->vhost_name)
 227                 vh->name = "default";
 228         else
 229                 vh->name = info->vhost_name;
 230
 231         vh->iface = info->iface;
 232         for (vh->count_protocols = 0;
 233              info->protocols[vh->count_protocols].callback;
 234              vh->count_protocols++)
 235                 ;
 236
 237         vh->options = info->options;
 238         vh->pvo = info->pvo;
 239         vh->keepalive_timeout = info->keepalive_timeout;
 240
 241 #ifdef LWS_WITH_PLUGINS
 242         if (plugin) {
 243                 /*
 244                  * give the vhost a unified list of protocols including the
 245                  * ones that came from plugins
 246                  */
 247                 lwsp = lws_zalloc(sizeof(struct lws_protocols) *
 248                                            (vh->count_protocols +
 249                                            context->plugin_protocol_count + 1));
 250                 if (!lwsp)
 251                         return NULL;
 252
 253                 m = vh->count_protocols;
 254                 memcpy(lwsp, info->protocols,
 255                        sizeof(struct lws_protocols) * m);
 256
 257                 /* for compatibility, all protocols enabled on vhost if only
 258                  * the default vhost exists.  Otherwise only vhosts who ask
 259                  * for a protocol get it enabled.
 260                  */
 261
 262                 if (info->options & LWS_SERVER_OPTION_EXPLICIT_VHOSTS)
 263                         f = 0;
 264
 265                 while (plugin) {
 266                         for (n = 0; n < plugin->caps.count_protocols; n++) {
 267                                 /*
 268                                  * for compatibility's sake, no pvo implies
 269                                  * allow all protocols
 270                                  */
 271                                 if (f || lws_vhost_protocol_options(vh,
 272                                     plugin->caps.protocols[n].name)) {
 273                                         memcpy(&lwsp[m],
 274                                                &plugin->caps.protocols[n],
 275                                                sizeof(struct lws_protocols));
 276                                         m++;
 277                                         vh->count_protocols++;
 278                                 }
 279                         }
 280                         plugin = plugin->list;
 281                 }
 282                 vh->protocols = lwsp;
 283         } else
 284 #endif
 285                 vh->protocols = info->protocols;
 286
 287         vh->same_vh_protocol_list = (struct lws **)
 288                         lws_zalloc(sizeof(struct lws *) * vh->count_protocols);
 289
 290         vh->mount_list = info->mounts;
 291
 292 #ifdef LWS_USE_UNIX_SOCK
 293         if (LWS_UNIX_SOCK_ENABLED(context)) {
 294                 lwsl_notice("Creating Vhost '%s' path \"%s\", %d protocols\n",
 295                                 vh->name, info->iface, vh->count_protocols);
 296         } else
 297 #endif
 298         lwsl_notice("Creating Vhost '%s' port %d, %d protocols\n",
 299                         vh->name, info->port, vh->count_protocols);
 300
 301         mounts = info->mounts;
 302         while (mounts) {
 303                 lwsl_notice("   mounting %s%s to %s\n",
 304                                 mount_protocols[mounts->origin_protocol],
 305                                 mounts->origin, mounts->mountpoint);
 306                 mounts = mounts->mount_next;
 307         }
 308
 309 #ifndef LWS_NO_EXTENSIONS
 310 #ifdef LWS_WITH_PLUGINS
 311         if (context->plugin_extension_count) {
 312
 313                 m = 0;
 314                 while (info->extensions && info->extensions[m].callback)
 315                         m++;
 316
 317                 /*
 318                  * give the vhost a unified list of extensions including the
 319                  * ones that came from plugins
 320                  */
 321                 vh->extensions = lws_zalloc(sizeof(struct lws_extension) *
 322                                            (m +
 323                                            context->plugin_extension_count + 1));
 324                 if (!vh->extensions)
 325                         return NULL;
 326
 327                 memcpy((struct lws_extension *)vh->extensions, info->extensions,
 328                        sizeof(struct lws_extension) * m);
 329                 plugin = context->plugin_list;
 330                 while (plugin) {
 331                         memcpy((struct lws_extension *)&vh->extensions[m],
 332                                 plugin->caps.extensions,
 333                                sizeof(struct lws_extension) *
 334                                plugin->caps.count_extensions);
 335                         m += plugin->caps.count_extensions;
 336                         plugin = plugin->list;
 337                 }
 338         } else
 339 #endif
 340                 vh->extensions = info->extensions;
 341 #endif
 342
 343         vh->listen_port = info->port;
 344         vh->http_proxy_port = 0;
 345         vh->http_proxy_address[0] = '\0';
 346
 347         /* either use proxy from info, or try get it from env var */
 348
 349         if (info->http_proxy_address) {
 350                 /* override for backwards compatibility */
 351                 if (info->http_proxy_port)
 352                         vh->http_proxy_port = info->http_proxy_port;
 353                 lws_set_proxy(vh, info->http_proxy_address);
 354         } else {
 355 #ifdef LWS_HAVE_GETENV
 356                 p = getenv("http_proxy");
 357                 if (p)
 358                         lws_set_proxy(vh, p);
 359 #endif
 360         }
 361
 362         vh->ka_time = info->ka_time;
 363         vh->ka_interval = info->ka_interval;
 364         vh->ka_probes = info->ka_probes;
 365
 366         if (vh->options & LWS_SERVER_OPTION_STS)
 367                 lwsl_notice("   STS enabled\n");
 368
 369 #ifdef LWS_WITH_ACCESS_LOG
 370         if (info->log_filepath) {
 371                 vh->log_fd = open(info->log_filepath, O_CREAT | O_APPEND | O_RDWR, 0600);
 372                 if (vh->log_fd == LWS_INVALID_FILE) {
 373                         lwsl_err("unable to open log filepath %s\n",
 374                                  info->log_filepath);
 375                         goto bail;
 376                 }
 377                 if (context->uid != -1)
 378                         if (chown(info->log_filepath, context->uid,
 379                                   context->gid) == -1)
 380                                 lwsl_err("unable to chown log file %s\n",
 381                                                 info->log_filepath);
 382         } else
 383                 vh->log_fd = LWS_INVALID_FILE;
 384 #endif
 385
 386         if (lws_context_init_server_ssl(info, vh))
 387                 goto bail;
 388
 389         if (lws_context_init_client_ssl(info, vh))
 390                 goto bail;
 391
 392         if (lws_context_init_server(info, vh))
 393                 goto bail;
 394
 395         while (1) {
 396                 if (!(*vh1)) {
 397                         *vh1 = vh;
 398                         break;
 399                 }
 400                 vh1 = &(*vh1)->vhost_next;
 401         };
 402
 403         return vh;
 404
 405 bail:
 406         lws_free(vh);
 407
 408         return NULL;
 409 }
 410
 411 /**
 412  * lws_create_context() - Create the websocket handler
 413  * @info:       pointer to struct with parameters
 414  *
 415  *      This function creates the listening socket (if serving) and takes care
 416  *      of all initialization in one step.
 417  *
 418  *      After initialization, it returns a struct lws_context * that
 419  *      represents this server.  After calling, user code needs to take care
 420  *      of calling lws_service() with the context pointer to get the
 421  *      server's sockets serviced.  This must be done in the same process
 422  *      context as the initialization call.
 423  *
 424  *      The protocol callback functions are called for a handful of events
 425  *      including http requests coming in, websocket connections becoming
 426  *      established, and data arriving; it's also called periodically to allow
 427  *      async transmission.
 428  *
 429  *      HTTP requests are sent always to the FIRST protocol in @protocol, since
 430  *      at that time websocket protocol has not been negotiated.  Other
 431  *      protocols after the first one never see any HTTP callack activity.
 432  *
 433  *      The server created is a simple http server by default; part of the
 434  *      websocket standard is upgrading this http connection to a websocket one.
 435  *
 436  *      This allows the same server to provide files like scripts and favicon /
 437  *      images or whatever over http and dynamic data over websockets all in
 438  *      one place; they're all handled in the user callback.
 439  */
 440 LWS_VISIBLE struct lws_context *
 441 lws_create_context(struct lws_context_creation_info *info)
 442 {
 443         struct lws_context *context = NULL;
 444         struct lws wsi;
 445 #ifndef LWS_NO_DAEMONIZE
 446         int pid_daemon = get_daemonize_pid();
 447 #endif
 448         int n, m;
 449 #if defined(__ANDROID__)
 450         struct rlimit rt;
 451 #endif
 452
 453         lwsl_notice("Initial logging level %d\n", log_level);
 454         lwsl_notice("Libwebsockets version: %s\n", library_version);
 455 #if LWS_POSIX
 456 #ifdef LWS_USE_IPV6
 457         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_DISABLE_IPV6))
 458                 lwsl_notice("IPV6 compiled in and enabled\n");
 459         else
 460                 lwsl_notice("IPV6 compiled in but disabled\n");
 461 #else
 462         lwsl_notice("IPV6 not compiled in\n");
 463 #endif
 464         lws_feature_status_libev(info);
 465         lws_feature_status_libuv(info);
 466 #endif
 467         lwsl_info(" LWS_DEF_HEADER_LEN    : %u\n", LWS_DEF_HEADER_LEN);
 468         lwsl_info(" LWS_MAX_PROTOCOLS     : %u\n", LWS_MAX_PROTOCOLS);
 469         lwsl_info(" LWS_MAX_SMP           : %u\n", LWS_MAX_SMP);
 470         lwsl_info(" SPEC_LATEST_SUPPORTED : %u\n", SPEC_LATEST_SUPPORTED);
 471         lwsl_info(" sizeof (*info)        : %u\n", sizeof(*info));
 472 #if LWS_POSIX
 473         lwsl_info(" SYSTEM_RANDOM_FILEPATH: '%s'\n", SYSTEM_RANDOM_FILEPATH);
 474 #endif
 475         if (lws_plat_context_early_init())
 476                 return NULL;
 477
 478         context = lws_zalloc(sizeof(struct lws_context));
 479         if (!context) {
 480                 lwsl_err("No memory for websocket context\n");
 481                 return NULL;
 482         }
 483
 484         context->time_up = time(NULL);
 485 #ifndef LWS_NO_DAEMONIZE
 486         if (pid_daemon) {
 487                 context->started_with_parent = pid_daemon;
 488                 lwsl_notice(" Started with daemon pid %d\n", pid_daemon);
 489         }
 490 #endif
 491 #if defined(__ANDROID__)
 492                 n = getrlimit ( RLIMIT_NOFILE,&rt);
 493                 if (-1 == n) {
 494                         lwsl_err("Get RLIMIT_NOFILE failed!\n");
 495                         return NULL;
 496                 }
 497                 context->max_fds = rt.rlim_cur;
 498 #else
 499                 context->max_fds = getdtablesize();
 500 #endif
 501
 502         if (info->count_threads)
 503                 context->count_threads = info->count_threads;
 504         else
 505                 context->count_threads = 1;
 506
 507         if (context->count_threads > LWS_MAX_SMP)
 508                 context->count_threads = LWS_MAX_SMP;
 509
 510         context->token_limits = info->token_limits;
 511
 512         context->options = info->options;
 513
 514         if (info->timeout_secs)
 515                 context->timeout_secs = info->timeout_secs;
 516         else
 517                 context->timeout_secs = AWAITING_TIMEOUT;
 518
 519         lwsl_info(" default timeout (secs): %u\n", context->timeout_secs);
 520
 521         if (info->max_http_header_data)
 522                 context->max_http_header_data = info->max_http_header_data;
 523         else
 524                 context->max_http_header_data = LWS_DEF_HEADER_LEN;
 525         if (info->max_http_header_pool)
 526                 context->max_http_header_pool = info->max_http_header_pool;
 527         else
 528                 context->max_http_header_pool = LWS_DEF_HEADER_POOL;
 529
 530         /*
 531          * Allocate the per-thread storage for scratchpad buffers,
 532          * and header data pool
 533          */
 534         for (n = 0; n < context->count_threads; n++) {
 535                 context->pt[n].serv_buf = lws_zalloc(LWS_MAX_SOCKET_IO_BUF);
 536                 if (!context->pt[n].serv_buf) {
 537                         lwsl_err("OOM\n");
 538                         return NULL;
 539                 }
 540
 541                 context->pt[n].context = context;
 542                 context->pt[n].tid = n;
 543                 context->pt[n].http_header_data = lws_malloc(context->max_http_header_data *
 544                                                        context->max_http_header_pool);
 545                 if (!context->pt[n].http_header_data)
 546                         goto bail;
 547
 548                 context->pt[n].ah_pool = lws_zalloc(sizeof(struct allocated_headers) *
 549                                               context->max_http_header_pool);
 550                 for (m = 0; m < context->max_http_header_pool; m++)
 551                         context->pt[n].ah_pool[m].data =
 552                                 (char *)context->pt[n].http_header_data +
 553                                 (m * context->max_http_header_data);
 554                 if (!context->pt[n].ah_pool)
 555                         goto bail;
 556
 557                 lws_pt_mutex_init(&context->pt[n]);
 558         }
 559
 560         if (info->fd_limit_per_thread)
 561                 context->fd_limit_per_thread = info->fd_limit_per_thread;
 562         else
 563                 context->fd_limit_per_thread = context->max_fds /
 564                                                context->count_threads;
 565
 566         lwsl_notice(" Threads: %d each %d fds\n", context->count_threads,
 567                     context->fd_limit_per_thread);
 568
 569         memset(&wsi, 0, sizeof(wsi));
 570         wsi.context = context;
 571
 572         if (!info->ka_interval && info->ka_time > 0) {
 573                 lwsl_err("info->ka_interval can't be 0 if ka_time used\n");
 574                 return NULL;
 575         }
 576
 577 #ifdef LWS_USE_LIBEV
 578         /* (Issue #264) In order to *avoid breaking backwards compatibility*, we
 579          * enable libev mediated SIGINT handling with a default handler of
 580          * lws_sigint_cb. The handler can be overridden or disabled
 581          * by invoking lws_sigint_cfg after creating the context, but
 582          * before invoking lws_initloop:
 583          */
 584         context->use_ev_sigint = 1;
 585         context->lws_ev_sigint_cb = &lws_ev_sigint_cb;
 586 #endif /* LWS_USE_LIBEV */
 587 #ifdef LWS_USE_LIBUV
 588         /* (Issue #264) In order to *avoid breaking backwards compatibility*, we
 589          * enable libev mediated SIGINT handling with a default handler of
 590          * lws_sigint_cb. The handler can be overridden or disabled
 591          * by invoking lws_sigint_cfg after creating the context, but
 592          * before invoking lws_initloop:
 593          */
 594         context->use_ev_sigint = 1;
 595         context->lws_uv_sigint_cb = &lws_uv_sigint_cb;
 596 #endif
 597
 598         lwsl_info(" mem: context:         %5u bytes (%d ctx + (%d thr x %d))\n",
 599                   sizeof(struct lws_context) +
 600                   (context->count_threads * LWS_MAX_SOCKET_IO_BUF),
 601                   sizeof(struct lws_context),
 602                   context->count_threads,
 603                   LWS_MAX_SOCKET_IO_BUF);
 604
 605         lwsl_info(" mem: http hdr rsvd:   %5u bytes (%u thr x (%u + %u) x %u))\n",
 606                     (context->max_http_header_data +
 607                      sizeof(struct allocated_headers)) *
 608                     context->max_http_header_pool * context->count_threads,
 609                     context->count_threads,
 610                     context->max_http_header_data,
 611                     sizeof(struct allocated_headers),
 612                     context->max_http_header_pool);
 613         n = sizeof(struct lws_pollfd) * context->count_threads *
 614             context->fd_limit_per_thread;
 615         context->pt[0].fds = lws_zalloc(n);
 616         if (context->pt[0].fds == NULL) {
 617                 lwsl_err("OOM allocating %d fds\n", context->max_fds);
 618                 goto bail;
 619         }
 620         lwsl_info(" mem: pollfd map:      %5u\n", n);
 621
 622         if (info->server_string) {
 623                 context->server_string = info->server_string;
 624                 context->server_string_len = (short)
 625                                 strlen(context->server_string);
 626         } else {
 627                 context->server_string = "libwebsockets";
 628                 context->server_string_len = 13;
 629         }
 630
 631 #if LWS_MAX_SMP > 1
 632         /* each thread serves his own chunk of fds */
 633         for (n = 1; n < (int)info->count_threads; n++)
 634                 context->pt[n].fds = context->pt[n - 1].fds +
 635                                      context->fd_limit_per_thread;
 636 #endif
 637
 638         if (lws_plat_init(context, info))
 639                 goto bail;
 640
 641         lws_context_init_ssl_library(info);
 642
 643         context->user_space = info->user;
 644
 645         /*
 646          * if he's not saying he'll make his own vhosts later then act
 647          * compatibly and make a default vhost using the data in the info
 648          */
 649         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
 650                 if (!lws_create_vhost(context, info)) {
 651                         lwsl_err("Failed to create default vhost\n");
 652                         return NULL;
 653                 }
 654
 655         lws_context_init_extensions(info, context);
 656
 657         lwsl_notice(" mem: per-conn:        %5u bytes + protocol rx buf\n",
 658                     sizeof(struct lws));
 659
 660         strcpy(context->canonical_hostname, "unknown");
 661         lws_server_get_canonical_hostname(context, info);
 662
 663         context->uid = info->uid;
 664         context->gid = info->gid;
 665
 666         /*
 667          * drop any root privs for this process
 668          * to listen on port < 1023 we would have needed root, but now we are
 669          * listening, we don't want the power for anything else
 670          */
 671         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
 672                 lws_plat_drop_app_privileges(info);
 673
 674         /*
 675          * give all extensions a chance to create any per-context
 676          * allocations they need
 677          */
 678         if (info->port != CONTEXT_PORT_NO_LISTEN) {
 679                 if (lws_ext_cb_all_exts(context, NULL,
 680                         LWS_EXT_CB_SERVER_CONTEXT_CONSTRUCT, NULL, 0) < 0)
 681                         goto bail;
 682         } else
 683                 if (lws_ext_cb_all_exts(context, NULL,
 684                         LWS_EXT_CB_CLIENT_CONTEXT_CONSTRUCT, NULL, 0) < 0)
 685                         goto bail;
 686
 687         return context;
 688
 689 bail:
 690         lws_context_destroy(context);
 691         return NULL;
 692 }
 693
 694 /**
 695  * lws_context_destroy() - Destroy the websocket context
 696  * @context:    Websocket context
 697  *
 698  *      This function closes any active connections and then frees the
 699  *      context.  After calling this, any further use of the context is
 700  *      undefined.
 701  */
 702 LWS_VISIBLE void
 703 lws_context_destroy(struct lws_context *context)
 704 {
 705         const struct lws_protocols *protocol = NULL;
 706         struct lws_context_per_thread *pt;
 707         struct lws_vhost *vh = NULL, *vh1;
 708         struct lws wsi;
 709         int n, m;
 710
 711         lwsl_notice("%s\n", __func__);
 712
 713         if (!context)
 714                 return;
 715
 716         m = context->count_threads;
 717         context->being_destroyed = 1;
 718
 719         memset(&wsi, 0, sizeof(wsi));
 720         wsi.context = context;
 721
 722 #ifdef LWS_LATENCY
 723         if (context->worst_latency_info[0])
 724                 lwsl_notice("Worst latency: %s\n", context->worst_latency_info);
 725 #endif
 726
 727         while (m--) {
 728                 pt = &context->pt[m];
 729
 730                 for (n = 0; (unsigned int)n < context->pt[m].fds_count; n++) {
 731                         struct lws *wsi = wsi_from_fd(context, pt->fds[n].fd);
 732                         if (!wsi)
 733                                 continue;
 734
 735                         lws_close_free_wsi(wsi,
 736                                 LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY
 737                                 /* no protocol close */);
 738                         n--;
 739                 }
 740         }
 741         /*
 742          * give all extensions a chance to clean up any per-context
 743          * allocations they might have made
 744          */
 745
 746         n = lws_ext_cb_all_exts(context, NULL,
 747                                 LWS_EXT_CB_SERVER_CONTEXT_DESTRUCT, NULL, 0);
 748
 749         n = lws_ext_cb_all_exts(context, NULL,
 750                                 LWS_EXT_CB_CLIENT_CONTEXT_DESTRUCT, NULL, 0);
 751
 752         /*
 753          * inform all the protocols that they are done and will have no more
 754          * callbacks.
 755          *
 756          * We can't free things until after the event loop shuts down.
 757          */
 758         if (context->protocol_init_done)
 759                 vh = context->vhost_list;
 760         while (vh) {
 761                 wsi.vhost = vh;
 762                 protocol = vh->protocols;
 763                 if (protocol) {
 764                         n = 0;
 765                         while (n < vh->count_protocols) {
 766                                 wsi.protocol = protocol;
 767                                 protocol->callback(&wsi, LWS_CALLBACK_PROTOCOL_DESTROY,
 768                                                    NULL, NULL, 0);
 769                                 protocol++;
 770                                 n++;
 771                         }
 772                 }
 773
 774                 vh = vh->vhost_next;
 775         }
 776
 777         for (n = 0; n < context->count_threads; n++) {
 778                 pt = &context->pt[n];
 779
 780                 lws_libev_destroyloop(context, n);
 781                 lws_libuv_destroyloop(context, n);
 782
 783                 lws_free_set_NULL(context->pt[n].serv_buf);
 784                 if (pt->ah_pool)
 785                         lws_free(pt->ah_pool);
 786                 if (pt->http_header_data)
 787                         lws_free(pt->http_header_data);
 788         }
 789         lws_plat_context_early_destroy(context);
 790         lws_ssl_context_destroy(context);
 791
 792         if (context->pt[0].fds)
 793                 lws_free_set_NULL(context->pt[0].fds);
 794
 795         /* free all the vhost allocations */
 796
 797         vh = context->vhost_list;
 798         while (vh) {
 799                 protocol = vh->protocols;
 800                 if (protocol) {
 801                         n = 0;
 802                         while (n < vh->count_protocols) {
 803                                 if (vh->protocol_vh_privs &&
 804                                     vh->protocol_vh_privs[n]) {
 805                                         lws_free(vh->protocol_vh_privs[n]);
 806                                         vh->protocol_vh_privs[n] = NULL;
 807                                 }
 808                                 protocol++;
 809                                 n++;
 810                         }
 811                 }
 812                 if (vh->protocol_vh_privs)
 813                         lws_free(vh->protocol_vh_privs);
 814                 lws_ssl_SSL_CTX_destroy(vh);
 815                 lws_free(vh->same_vh_protocol_list);
 816 #ifdef LWS_WITH_PLUGINS
 817                 if (context->plugin_list)
 818                         lws_free((void *)vh->protocols);
 819 #ifndef LWS_NO_EXTENSIONS
 820                 if (context->plugin_extension_count)
 821                         lws_free((void *)vh->extensions);
 822 #endif
 823 #endif
 824 #ifdef LWS_WITH_ACCESS_LOG
 825                 if (vh->log_fd != LWS_INVALID_FILE)
 826                         close(vh->log_fd);
 827 #endif
 828
 829                 vh1 = vh->vhost_next;
 830                 lws_free(vh);
 831                 vh = vh1;
 832         }
 833
 834         lws_plat_context_late_destroy(context);
 835
 836         lws_free(context);
 837 }