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
 182 callback_http_dummy(struct lws *wsi, enum lws_callback_reasons reason,
 183                     void *user, void *in, size_t len)
 184 {
 185 #ifdef LWS_WITH_CGI
 186         struct lws_cgi_args *args;
 187         char buf[128];
 188         int n;
 189 #endif
 190
 191         switch (reason) {
 192         case LWS_CALLBACK_HTTP:
 193 #ifndef LWS_NO_SERVER
 194                 if (lws_http_transaction_completed(wsi))
 195 #endif
 196                         return -1;
 197                 break;
 198
 199         case LWS_CALLBACK_HTTP_WRITEABLE:
 200 #ifdef LWS_WITH_CGI
 201                 if (wsi->reason_bf & 1) {
 202                         if (lws_cgi_write_split_stdout_headers(wsi) < 0)
 203                                 return -1;
 204
 205                         wsi->reason_bf &= ~1;
 206                         break;
 207                 }
 208 #endif
 209                 break;
 210
 211 #ifdef LWS_WITH_CGI
 212         /* CGI IO events (POLLIN/OUT) appear here, our default policy is:
 213          *
 214          *  - POST data goes on subprocess stdin
 215          *  - subprocess stdout goes on http via writeable callback
 216          *  - subprocess stderr goes to the logs
 217          */
 218         case LWS_CALLBACK_CGI:
 219                 args = (struct lws_cgi_args *)in;
 220                 switch (args->ch) { /* which of stdin/out/err ? */
 221                 case LWS_STDIN:
 222                         /* TBD stdin rx flow control */
 223                         break;
 224                 case LWS_STDOUT:
 225                         wsi->reason_bf |= 1;
 226                         /* when writing to MASTER would not block */
 227                         lws_callback_on_writable(wsi);
 228                         break;
 229                 case LWS_STDERR:
 230                         n = read(lws_get_socket_fd(args->stdwsi[LWS_STDERR]),
 231                                                    buf, sizeof(buf) - 1);
 232                         if (n > 0) {
 233                                 if (buf[n - 1] != '\n')
 234                                         buf[n++] = '\n';
 235                                 buf[n] = '\0';
 236                                 lwsl_notice("CGI-stderr: %s\n", buf);
 237                         }
 238                         break;
 239                 }
 240                 break;
 241
 242         case LWS_CALLBACK_CGI_TERMINATED:
 243                 return -1;
 244
 245         case LWS_CALLBACK_CGI_STDIN_DATA:  /* POST body for stdin */
 246                 args = (struct lws_cgi_args *)in;
 247                 args->data[args->len] = '\0';
 248                 n = write(lws_get_socket_fd(args->stdwsi[LWS_STDIN]),
 249                           args->data, args->len);
 250                 if (n < args->len)
 251                         lwsl_notice("LWS_CALLBACK_CGI_STDIN_DATA: "
 252                                     "sent %d only %d went", n, args->len);
 253                 return n;
 254 #endif
 255         default:
 256                 break;
 257         }
 258
 259         return 0;
 260 }
 261
 262 /* list of supported protocols and callbacks */
 263
 264 static const struct lws_protocols protocols_dummy[] = {
 265         /* first protocol must always be HTTP handler */
 266
 267         {
 268                 "http-only",            /* name */
 269                 callback_http_dummy,            /* callback */
 270                 0,      /* per_session_data_size */
 271                 0,                      /* max frame size / rx buffer */
 272         },
 273         /*
 274          * the other protocols are provided by lws plugins
 275          */
 276         { NULL, NULL, 0, 0 } /* terminator */
 277 };
 278
 279 LWS_VISIBLE struct lws_vhost *
 280 lws_create_vhost(struct lws_context *context,
 281                  struct lws_context_creation_info *info)
 282 {
 283         struct lws_vhost *vh = lws_zalloc(sizeof(*vh)),
 284                          **vh1 = &context->vhost_list;
 285         const struct lws_http_mount *mounts;
 286 #ifdef LWS_WITH_PLUGINS
 287         struct lws_plugin *plugin = context->plugin_list;
 288         struct lws_protocols *lwsp;
 289         int m, n, f = !info->pvo;
 290 #endif
 291         char *p;
 292
 293         if (!vh)
 294                 return NULL;
 295
 296         if (!info->protocols)
 297                 info->protocols = &protocols_dummy[0];
 298
 299         vh->context = context;
 300         if (!info->vhost_name)
 301                 vh->name = "default";
 302         else
 303                 vh->name = info->vhost_name;
 304
 305         vh->iface = info->iface;
 306         for (vh->count_protocols = 0;
 307              info->protocols[vh->count_protocols].callback;
 308              vh->count_protocols++)
 309                 ;
 310
 311         vh->options = info->options;
 312         vh->pvo = info->pvo;
 313         vh->keepalive_timeout = info->keepalive_timeout;
 314
 315 #ifdef LWS_WITH_PLUGINS
 316         if (plugin) {
 317                 /*
 318                  * give the vhost a unified list of protocols including the
 319                  * ones that came from plugins
 320                  */
 321                 lwsp = lws_zalloc(sizeof(struct lws_protocols) *
 322                                            (vh->count_protocols +
 323                                            context->plugin_protocol_count + 1));
 324                 if (!lwsp)
 325                         return NULL;
 326
 327                 m = vh->count_protocols;
 328                 memcpy(lwsp, info->protocols,
 329                        sizeof(struct lws_protocols) * m);
 330
 331                 /* for compatibility, all protocols enabled on vhost if only
 332                  * the default vhost exists.  Otherwise only vhosts who ask
 333                  * for a protocol get it enabled.
 334                  */
 335
 336                 if (info->options & LWS_SERVER_OPTION_EXPLICIT_VHOSTS)
 337                         f = 0;
 338
 339                 while (plugin) {
 340                         for (n = 0; n < plugin->caps.count_protocols; n++) {
 341                                 /*
 342                                  * for compatibility's sake, no pvo implies
 343                                  * allow all protocols
 344                                  */
 345                                 if (f || lws_vhost_protocol_options(vh,
 346                                     plugin->caps.protocols[n].name)) {
 347                                         memcpy(&lwsp[m],
 348                                                &plugin->caps.protocols[n],
 349                                                sizeof(struct lws_protocols));
 350                                         m++;
 351                                         vh->count_protocols++;
 352                                 }
 353                         }
 354                         plugin = plugin->list;
 355                 }
 356                 vh->protocols = lwsp;
 357         } else
 358 #endif
 359                 vh->protocols = info->protocols;
 360
 361         vh->same_vh_protocol_list = (struct lws **)
 362                         lws_zalloc(sizeof(struct lws *) * vh->count_protocols);
 363
 364         vh->mount_list = info->mounts;
 365
 366 #ifdef LWS_USE_UNIX_SOCK
 367         if (LWS_UNIX_SOCK_ENABLED(context)) {
 368                 lwsl_notice("Creating Vhost '%s' path \"%s\", %d protocols\n",
 369                                 vh->name, info->iface, vh->count_protocols);
 370         } else
 371 #endif
 372         lwsl_notice("Creating Vhost '%s' port %d, %d protocols\n",
 373                         vh->name, info->port, vh->count_protocols);
 374
 375         mounts = info->mounts;
 376         while (mounts) {
 377                 lwsl_notice("   mounting %s%s to %s\n",
 378                                 mount_protocols[mounts->origin_protocol],
 379                                 mounts->origin, mounts->mountpoint);
 380                 mounts = mounts->mount_next;
 381         }
 382
 383 #ifndef LWS_NO_EXTENSIONS
 384 #ifdef LWS_WITH_PLUGINS
 385         if (context->plugin_extension_count) {
 386
 387                 m = 0;
 388                 while (info->extensions && info->extensions[m].callback)
 389                         m++;
 390
 391                 /*
 392                  * give the vhost a unified list of extensions including the
 393                  * ones that came from plugins
 394                  */
 395                 vh->extensions = lws_zalloc(sizeof(struct lws_extension) *
 396                                            (m +
 397                                            context->plugin_extension_count + 1));
 398                 if (!vh->extensions)
 399                         return NULL;
 400
 401                 memcpy((struct lws_extension *)vh->extensions, info->extensions,
 402                        sizeof(struct lws_extension) * m);
 403                 plugin = context->plugin_list;
 404                 while (plugin) {
 405                         memcpy((struct lws_extension *)&vh->extensions[m],
 406                                 plugin->caps.extensions,
 407                                sizeof(struct lws_extension) *
 408                                plugin->caps.count_extensions);
 409                         m += plugin->caps.count_extensions;
 410                         plugin = plugin->list;
 411                 }
 412         } else
 413 #endif
 414                 vh->extensions = info->extensions;
 415 #endif
 416
 417         vh->listen_port = info->port;
 418         vh->http_proxy_port = 0;
 419         vh->http_proxy_address[0] = '\0';
 420
 421         /* either use proxy from info, or try get it from env var */
 422
 423         if (info->http_proxy_address) {
 424                 /* override for backwards compatibility */
 425                 if (info->http_proxy_port)
 426                         vh->http_proxy_port = info->http_proxy_port;
 427                 lws_set_proxy(vh, info->http_proxy_address);
 428         } else {
 429 #ifdef LWS_HAVE_GETENV
 430                 p = getenv("http_proxy");
 431                 if (p)
 432                         lws_set_proxy(vh, p);
 433 #endif
 434         }
 435
 436         vh->ka_time = info->ka_time;
 437         vh->ka_interval = info->ka_interval;
 438         vh->ka_probes = info->ka_probes;
 439
 440         if (vh->options & LWS_SERVER_OPTION_STS)
 441                 lwsl_notice("   STS enabled\n");
 442
 443 #ifdef LWS_WITH_ACCESS_LOG
 444         if (info->log_filepath) {
 445                 vh->log_fd = open(info->log_filepath, O_CREAT | O_APPEND | O_RDWR, 0600);
 446                 if (vh->log_fd == LWS_INVALID_FILE) {
 447                         lwsl_err("unable to open log filepath %s\n",
 448                                  info->log_filepath);
 449                         goto bail;
 450                 }
 451 #ifndef WIN32
 452                 if (context->uid != -1)
 453                         if (chown(info->log_filepath, context->uid,
 454                                   context->gid) == -1)
 455                                 lwsl_err("unable to chown log file %s\n",
 456                                                 info->log_filepath);
 457 #endif
 458         } else
 459                 vh->log_fd = LWS_INVALID_FILE;
 460 #endif
 461
 462         if (lws_context_init_server_ssl(info, vh))
 463                 goto bail;
 464
 465         if (lws_context_init_client_ssl(info, vh))
 466                 goto bail;
 467
 468         if (lws_context_init_server(info, vh))
 469                 goto bail;
 470
 471         while (1) {
 472                 if (!(*vh1)) {
 473                         *vh1 = vh;
 474                         break;
 475                 }
 476                 vh1 = &(*vh1)->vhost_next;
 477         };
 478
 479         return vh;
 480
 481 bail:
 482         lws_free(vh);
 483
 484         return NULL;
 485 }
 486
 487 /**
 488  * lws_create_context() - Create the websocket handler
 489  * @info:       pointer to struct with parameters
 490  *
 491  *      This function creates the listening socket (if serving) and takes care
 492  *      of all initialization in one step.
 493  *
 494  *      After initialization, it returns a struct lws_context * that
 495  *      represents this server.  After calling, user code needs to take care
 496  *      of calling lws_service() with the context pointer to get the
 497  *      server's sockets serviced.  This must be done in the same process
 498  *      context as the initialization call.
 499  *
 500  *      The protocol callback functions are called for a handful of events
 501  *      including http requests coming in, websocket connections becoming
 502  *      established, and data arriving; it's also called periodically to allow
 503  *      async transmission.
 504  *
 505  *      HTTP requests are sent always to the FIRST protocol in @protocol, since
 506  *      at that time websocket protocol has not been negotiated.  Other
 507  *      protocols after the first one never see any HTTP callack activity.
 508  *
 509  *      The server created is a simple http server by default; part of the
 510  *      websocket standard is upgrading this http connection to a websocket one.
 511  *
 512  *      This allows the same server to provide files like scripts and favicon /
 513  *      images or whatever over http and dynamic data over websockets all in
 514  *      one place; they're all handled in the user callback.
 515  */
 516 LWS_VISIBLE struct lws_context *
 517 lws_create_context(struct lws_context_creation_info *info)
 518 {
 519         struct lws_context *context = NULL;
 520         struct lws wsi;
 521 #ifndef LWS_NO_DAEMONIZE
 522         int pid_daemon = get_daemonize_pid();
 523 #endif
 524         int n, m;
 525 #if defined(__ANDROID__)
 526         struct rlimit rt;
 527 #endif
 528
 529         lwsl_notice("Initial logging level %d\n", log_level);
 530         lwsl_notice("Libwebsockets version: %s\n", library_version);
 531 #if LWS_POSIX
 532 #ifdef LWS_USE_IPV6
 533         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_DISABLE_IPV6))
 534                 lwsl_notice("IPV6 compiled in and enabled\n");
 535         else
 536                 lwsl_notice("IPV6 compiled in but disabled\n");
 537 #else
 538         lwsl_notice("IPV6 not compiled in\n");
 539 #endif
 540         lws_feature_status_libev(info);
 541         lws_feature_status_libuv(info);
 542 #endif
 543         lwsl_info(" LWS_DEF_HEADER_LEN    : %u\n", LWS_DEF_HEADER_LEN);
 544         lwsl_info(" LWS_MAX_PROTOCOLS     : %u\n", LWS_MAX_PROTOCOLS);
 545         lwsl_info(" LWS_MAX_SMP           : %u\n", LWS_MAX_SMP);
 546         lwsl_info(" SPEC_LATEST_SUPPORTED : %u\n", SPEC_LATEST_SUPPORTED);
 547         lwsl_info(" sizeof (*info)        : %u\n", sizeof(*info));
 548 #if LWS_POSIX
 549         lwsl_info(" SYSTEM_RANDOM_FILEPATH: '%s'\n", SYSTEM_RANDOM_FILEPATH);
 550 #endif
 551         if (lws_plat_context_early_init())
 552                 return NULL;
 553
 554         context = lws_zalloc(sizeof(struct lws_context));
 555         if (!context) {
 556                 lwsl_err("No memory for websocket context\n");
 557                 return NULL;
 558         }
 559
 560         context->time_up = time(NULL);
 561 #ifndef LWS_NO_DAEMONIZE
 562         if (pid_daemon) {
 563                 context->started_with_parent = pid_daemon;
 564                 lwsl_notice(" Started with daemon pid %d\n", pid_daemon);
 565         }
 566 #endif
 567 #if defined(__ANDROID__)
 568                 n = getrlimit ( RLIMIT_NOFILE,&rt);
 569                 if (-1 == n) {
 570                         lwsl_err("Get RLIMIT_NOFILE failed!\n");
 571                         return NULL;
 572                 }
 573                 context->max_fds = rt.rlim_cur;
 574 #else
 575                 context->max_fds = getdtablesize();
 576 #endif
 577
 578         if (info->count_threads)
 579                 context->count_threads = info->count_threads;
 580         else
 581                 context->count_threads = 1;
 582
 583         if (context->count_threads > LWS_MAX_SMP)
 584                 context->count_threads = LWS_MAX_SMP;
 585
 586         context->token_limits = info->token_limits;
 587
 588         context->options = info->options;
 589
 590         if (info->timeout_secs)
 591                 context->timeout_secs = info->timeout_secs;
 592         else
 593                 context->timeout_secs = AWAITING_TIMEOUT;
 594
 595         lwsl_info(" default timeout (secs): %u\n", context->timeout_secs);
 596
 597         if (info->max_http_header_data)
 598                 context->max_http_header_data = info->max_http_header_data;
 599         else
 600                 context->max_http_header_data = LWS_DEF_HEADER_LEN;
 601         if (info->max_http_header_pool)
 602                 context->max_http_header_pool = info->max_http_header_pool;
 603         else
 604                 context->max_http_header_pool = LWS_DEF_HEADER_POOL;
 605
 606         /*
 607          * Allocate the per-thread storage for scratchpad buffers,
 608          * and header data pool
 609          */
 610         for (n = 0; n < context->count_threads; n++) {
 611                 context->pt[n].serv_buf = lws_zalloc(LWS_MAX_SOCKET_IO_BUF);
 612                 if (!context->pt[n].serv_buf) {
 613                         lwsl_err("OOM\n");
 614                         return NULL;
 615                 }
 616
 617                 context->pt[n].context = context;
 618                 context->pt[n].tid = n;
 619                 context->pt[n].http_header_data = lws_malloc(context->max_http_header_data *
 620                                                        context->max_http_header_pool);
 621                 if (!context->pt[n].http_header_data)
 622                         goto bail;
 623
 624                 context->pt[n].ah_pool = lws_zalloc(sizeof(struct allocated_headers) *
 625                                               context->max_http_header_pool);
 626                 for (m = 0; m < context->max_http_header_pool; m++)
 627                         context->pt[n].ah_pool[m].data =
 628                                 (char *)context->pt[n].http_header_data +
 629                                 (m * context->max_http_header_data);
 630                 if (!context->pt[n].ah_pool)
 631                         goto bail;
 632
 633                 lws_pt_mutex_init(&context->pt[n]);
 634         }
 635
 636         if (info->fd_limit_per_thread)
 637                 context->fd_limit_per_thread = info->fd_limit_per_thread;
 638         else
 639                 context->fd_limit_per_thread = context->max_fds /
 640                                                context->count_threads;
 641
 642         lwsl_notice(" Threads: %d each %d fds\n", context->count_threads,
 643                     context->fd_limit_per_thread);
 644
 645         memset(&wsi, 0, sizeof(wsi));
 646         wsi.context = context;
 647
 648         if (!info->ka_interval && info->ka_time > 0) {
 649                 lwsl_err("info->ka_interval can't be 0 if ka_time used\n");
 650                 return NULL;
 651         }
 652
 653 #ifdef LWS_USE_LIBEV
 654         /* (Issue #264) In order to *avoid breaking backwards compatibility*, we
 655          * enable libev mediated SIGINT handling with a default handler of
 656          * lws_sigint_cb. The handler can be overridden or disabled
 657          * by invoking lws_sigint_cfg after creating the context, but
 658          * before invoking lws_initloop:
 659          */
 660         context->use_ev_sigint = 1;
 661         context->lws_ev_sigint_cb = &lws_ev_sigint_cb;
 662 #endif /* LWS_USE_LIBEV */
 663 #ifdef LWS_USE_LIBUV
 664         /* (Issue #264) In order to *avoid breaking backwards compatibility*, we
 665          * enable libev mediated SIGINT handling with a default handler of
 666          * lws_sigint_cb. The handler can be overridden or disabled
 667          * by invoking lws_sigint_cfg after creating the context, but
 668          * before invoking lws_initloop:
 669          */
 670         context->use_ev_sigint = 1;
 671         context->lws_uv_sigint_cb = &lws_uv_sigint_cb;
 672 #endif
 673
 674         lwsl_info(" mem: context:         %5u bytes (%d ctx + (%d thr x %d))\n",
 675                   sizeof(struct lws_context) +
 676                   (context->count_threads * LWS_MAX_SOCKET_IO_BUF),
 677                   sizeof(struct lws_context),
 678                   context->count_threads,
 679                   LWS_MAX_SOCKET_IO_BUF);
 680
 681         lwsl_info(" mem: http hdr rsvd:   %5u bytes (%u thr x (%u + %u) x %u))\n",
 682                     (context->max_http_header_data +
 683                      sizeof(struct allocated_headers)) *
 684                     context->max_http_header_pool * context->count_threads,
 685                     context->count_threads,
 686                     context->max_http_header_data,
 687                     sizeof(struct allocated_headers),
 688                     context->max_http_header_pool);
 689         n = sizeof(struct lws_pollfd) * context->count_threads *
 690             context->fd_limit_per_thread;
 691         context->pt[0].fds = lws_zalloc(n);
 692         if (context->pt[0].fds == NULL) {
 693                 lwsl_err("OOM allocating %d fds\n", context->max_fds);
 694                 goto bail;
 695         }
 696         lwsl_info(" mem: pollfd map:      %5u\n", n);
 697
 698         if (info->server_string) {
 699                 context->server_string = info->server_string;
 700                 context->server_string_len = (short)
 701                                 strlen(context->server_string);
 702         } else {
 703                 context->server_string = "libwebsockets";
 704                 context->server_string_len = 13;
 705         }
 706
 707 #if LWS_MAX_SMP > 1
 708         /* each thread serves his own chunk of fds */
 709         for (n = 1; n < (int)info->count_threads; n++)
 710                 context->pt[n].fds = context->pt[n - 1].fds +
 711                                      context->fd_limit_per_thread;
 712 #endif
 713
 714         if (lws_plat_init(context, info))
 715                 goto bail;
 716
 717         lws_context_init_ssl_library(info);
 718
 719         context->user_space = info->user;
 720
 721         /*
 722          * if he's not saying he'll make his own vhosts later then act
 723          * compatibly and make a default vhost using the data in the info
 724          */
 725         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
 726                 if (!lws_create_vhost(context, info)) {
 727                         lwsl_err("Failed to create default vhost\n");
 728                         return NULL;
 729                 }
 730
 731         lws_context_init_extensions(info, context);
 732
 733         lwsl_notice(" mem: per-conn:        %5u bytes + protocol rx buf\n",
 734                     sizeof(struct lws));
 735
 736         strcpy(context->canonical_hostname, "unknown");
 737         lws_server_get_canonical_hostname(context, info);
 738
 739         context->uid = info->uid;
 740         context->gid = info->gid;
 741
 742         /*
 743          * drop any root privs for this process
 744          * to listen on port < 1023 we would have needed root, but now we are
 745          * listening, we don't want the power for anything else
 746          */
 747         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
 748                 lws_plat_drop_app_privileges(info);
 749
 750         /*
 751          * give all extensions a chance to create any per-context
 752          * allocations they need
 753          */
 754         if (info->port != CONTEXT_PORT_NO_LISTEN) {
 755                 if (lws_ext_cb_all_exts(context, NULL,
 756                         LWS_EXT_CB_SERVER_CONTEXT_CONSTRUCT, NULL, 0) < 0)
 757                         goto bail;
 758         } else
 759                 if (lws_ext_cb_all_exts(context, NULL,
 760                         LWS_EXT_CB_CLIENT_CONTEXT_CONSTRUCT, NULL, 0) < 0)
 761                         goto bail;
 762
 763         return context;
 764
 765 bail:
 766         lws_context_destroy(context);
 767         return NULL;
 768 }
 769
 770 /**
 771  * lws_context_destroy() - Destroy the websocket context
 772  * @context:    Websocket context
 773  *
 774  *      This function closes any active connections and then frees the
 775  *      context.  After calling this, any further use of the context is
 776  *      undefined.
 777  */
 778 LWS_VISIBLE void
 779 lws_context_destroy(struct lws_context *context)
 780 {
 781         const struct lws_protocols *protocol = NULL;
 782         struct lws_context_per_thread *pt;
 783         struct lws_vhost *vh = NULL, *vh1;
 784         struct lws wsi;
 785         int n, m;
 786
 787         lwsl_notice("%s\n", __func__);
 788
 789         if (!context)
 790                 return;
 791
 792         m = context->count_threads;
 793         context->being_destroyed = 1;
 794
 795         memset(&wsi, 0, sizeof(wsi));
 796         wsi.context = context;
 797
 798 #ifdef LWS_LATENCY
 799         if (context->worst_latency_info[0])
 800                 lwsl_notice("Worst latency: %s\n", context->worst_latency_info);
 801 #endif
 802
 803         while (m--) {
 804                 pt = &context->pt[m];
 805
 806                 for (n = 0; (unsigned int)n < context->pt[m].fds_count; n++) {
 807                         struct lws *wsi = wsi_from_fd(context, pt->fds[n].fd);
 808                         if (!wsi)
 809                                 continue;
 810
 811                         lws_close_free_wsi(wsi,
 812                                 LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY
 813                                 /* no protocol close */);
 814                         n--;
 815                 }
 816         }
 817         /*
 818          * give all extensions a chance to clean up any per-context
 819          * allocations they might have made
 820          */
 821
 822         n = lws_ext_cb_all_exts(context, NULL,
 823                                 LWS_EXT_CB_SERVER_CONTEXT_DESTRUCT, NULL, 0);
 824
 825         n = lws_ext_cb_all_exts(context, NULL,
 826                                 LWS_EXT_CB_CLIENT_CONTEXT_DESTRUCT, NULL, 0);
 827
 828         /*
 829          * inform all the protocols that they are done and will have no more
 830          * callbacks.
 831          *
 832          * We can't free things until after the event loop shuts down.
 833          */
 834         if (context->protocol_init_done)
 835                 vh = context->vhost_list;
 836         while (vh) {
 837                 wsi.vhost = vh;
 838                 protocol = vh->protocols;
 839                 if (protocol) {
 840                         n = 0;
 841                         while (n < vh->count_protocols) {
 842                                 wsi.protocol = protocol;
 843                                 protocol->callback(&wsi, LWS_CALLBACK_PROTOCOL_DESTROY,
 844                                                    NULL, NULL, 0);
 845                                 protocol++;
 846                                 n++;
 847                         }
 848                 }
 849
 850                 vh = vh->vhost_next;
 851         }
 852
 853         for (n = 0; n < context->count_threads; n++) {
 854                 pt = &context->pt[n];
 855
 856                 lws_libev_destroyloop(context, n);
 857                 lws_libuv_destroyloop(context, n);
 858
 859                 lws_free_set_NULL(context->pt[n].serv_buf);
 860                 if (pt->ah_pool)
 861                         lws_free(pt->ah_pool);
 862                 if (pt->http_header_data)
 863                         lws_free(pt->http_header_data);
 864         }
 865         lws_plat_context_early_destroy(context);
 866         lws_ssl_context_destroy(context);
 867
 868         if (context->pt[0].fds)
 869                 lws_free_set_NULL(context->pt[0].fds);
 870
 871         /* free all the vhost allocations */
 872
 873         vh = context->vhost_list;
 874         while (vh) {
 875                 protocol = vh->protocols;
 876                 if (protocol) {
 877                         n = 0;
 878                         while (n < vh->count_protocols) {
 879                                 if (vh->protocol_vh_privs &&
 880                                     vh->protocol_vh_privs[n]) {
 881                                         lws_free(vh->protocol_vh_privs[n]);
 882                                         vh->protocol_vh_privs[n] = NULL;
 883                                 }
 884                                 protocol++;
 885                                 n++;
 886                         }
 887                 }
 888                 if (vh->protocol_vh_privs)
 889                         lws_free(vh->protocol_vh_privs);
 890                 lws_ssl_SSL_CTX_destroy(vh);
 891                 lws_free(vh->same_vh_protocol_list);
 892 #ifdef LWS_WITH_PLUGINS
 893                 if (context->plugin_list)
 894                         lws_free((void *)vh->protocols);
 895 #ifndef LWS_NO_EXTENSIONS
 896                 if (context->plugin_extension_count)
 897                         lws_free((void *)vh->extensions);
 898 #endif
 899 #endif
 900 #ifdef LWS_WITH_ACCESS_LOG
 901                 if (vh->log_fd != LWS_INVALID_FILE)
 902                         close(vh->log_fd);
 903 #endif
 904
 905                 vh1 = vh->vhost_next;
 906                 lws_free(vh);
 907                 vh = vh1;
 908         }
 909
 910         lws_plat_context_late_destroy(context);
 911
 912         lws_free(context);
 913 }