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                 n = 0;
  72                 while (n < vhost->count_protocols &&
  73                        strcmp(vhost->protocols[n].name, prot->name))
  74                         n++;
  75
  76                 if (n == vhost->count_protocols)
  77                         return NULL;
  78         }
  79
  80         vhost->protocol_vh_privs[n] = lws_zalloc(size);
  81         return vhost->protocol_vh_privs[n];
  82 }
  83
  84 LWS_VISIBLE void *
  85 lws_protocol_vh_priv_get(struct lws_vhost *vhost, const struct lws_protocols *prot)
  86 {
  87         int n = 0;
  88
  89         if (!vhost->protocol_vh_privs)
  90                 return NULL;
  91
  92         while (n < vhost->count_protocols && &vhost->protocols[n] != prot)
  93                 n++;
  94
  95         if (n == vhost->count_protocols) {
  96                 n = 0;
  97                 while (n < vhost->count_protocols &&
  98                        strcmp(vhost->protocols[n].name, prot->name))
  99                         n++;
 100
 101                 if (n == vhost->count_protocols) {
 102                         lwsl_err("%s: unknown protocol %p\n", __func__, prot);
 103                         return NULL;
 104                 }
 105         }
 106
 107         return vhost->protocol_vh_privs[n];
 108 }
 109
 110 static const struct lws_protocol_vhost_options *
 111 lws_vhost_protocol_options(struct lws_vhost *vh, const char *name)
 112 {
 113         const struct lws_protocol_vhost_options *pvo = vh->pvo;
 114
 115         while (pvo) {
 116                 // lwsl_notice("%s: '%s' '%s'\n", __func__, pvo->name, name);
 117                 if (!strcmp(pvo->name, name))
 118                         return pvo;
 119                 pvo = pvo->next;
 120         }
 121
 122         return NULL;
 123 }
 124
 125 /*
 126  * inform every vhost that hasn't already done it, that
 127  * his protocols are initializing
 128  */
 129 LWS_VISIBLE int
 130 lws_protocol_init(struct lws_context *context)
 131 {
 132         struct lws_vhost *vh = context->vhost_list;
 133         const struct lws_protocol_vhost_options *pvo, *pvo1;
 134         struct lws wsi;
 135         int n;
 136
 137         memset(&wsi, 0, sizeof(wsi));
 138         wsi.context = context;
 139
 140         lwsl_info("%s\n", __func__);
 141
 142         while (vh) {
 143                 wsi.vhost = vh;
 144
 145                 /* only do the protocol init once for a given vhost */
 146                 if (vh->created_vhost_protocols)
 147                         goto next;
 148
 149                 /* initialize supported protocols on this vhost */
 150
 151                 for (n = 0; n < vh->count_protocols; n++) {
 152                         wsi.protocol = &vh->protocols[n];
 153                         if (!vh->protocols[n].name)
 154                                 continue;
 155                         pvo = lws_vhost_protocol_options(vh,
 156                                                          vh->protocols[n].name);
 157                         if (pvo) {
 158                                 /*
 159                                  * linked list of options specific to
 160                                  * vh + protocol
 161                                  */
 162                                 pvo1 = pvo;
 163                                 pvo = pvo1->options;
 164
 165                                 while (pvo) {
 166                                         lwsl_notice("    vh %s prot %s opt %s\n",
 167                                                         vh->name,
 168                                                         vh->protocols[n].name,
 169                                                         pvo->name);
 170
 171                                         if (!strcmp(pvo->name, "default")) {
 172                                                 lwsl_notice("Setting default "
 173                                                    "protocol for vh %s to %s\n",
 174                                                    vh->name,
 175                                                    vh->protocols[n].name);
 176                                                 vh->default_protocol_index = n;
 177                                         }
 178                                         if (!strcmp(pvo->name, "raw")) {
 179                                                 lwsl_notice("Setting raw "
 180                                                    "protocol for vh %s to %s\n",
 181                                                    vh->name,
 182                                                    vh->protocols[n].name);
 183                                                 vh->raw_protocol_index = n;
 184                                         }
 185                                         pvo = pvo->next;
 186                                 }
 187
 188                                 pvo = pvo1->options;
 189                         }
 190
 191                         /*
 192                          * inform all the protocols that they are doing their one-time
 193                          * initialization if they want to.
 194                          *
 195                          * NOTE the wsi is all zeros except for the context, vh and
 196                          * protocol ptrs so lws_get_context(wsi) etc can work
 197                          */
 198                         if (vh->protocols[n].callback(&wsi,
 199                                 LWS_CALLBACK_PROTOCOL_INIT, NULL,
 200                                 (void *)pvo, 0))
 201                                 return 1;
 202                 }
 203
 204                 vh->created_vhost_protocols = 1;
 205 next:
 206                 vh = vh->vhost_next;
 207         }
 208
 209         if (!context->protocol_init_done)
 210                 lws_finalize_startup(context);
 211
 212         context->protocol_init_done = 1;
 213
 214         return 0;
 215 }
 216
 217 LWS_VISIBLE int
 218 lws_callback_http_dummy(struct lws *wsi, enum lws_callback_reasons reason,
 219                     void *user, void *in, size_t len)
 220 {
 221 #ifdef LWS_WITH_CGI
 222         struct lws_cgi_args *args;
 223         char buf[128];
 224         int n;
 225 #endif
 226
 227         switch (reason) {
 228         case LWS_CALLBACK_HTTP:
 229 #ifndef LWS_NO_SERVER
 230                 if (lws_return_http_status(wsi, HTTP_STATUS_NOT_FOUND, NULL))
 231                         return -1;
 232
 233                 if (lws_http_transaction_completed(wsi))
 234 #endif
 235                         return -1;
 236                 break;
 237
 238         case LWS_CALLBACK_HTTP_WRITEABLE:
 239 #ifdef LWS_WITH_CGI
 240                 if (wsi->reason_bf & 1) {
 241                         if (lws_cgi_write_split_stdout_headers(wsi) < 0)
 242                                 return -1;
 243
 244                         if (wsi->reason_bf & 8)
 245                                 wsi->reason_bf &= ~8;
 246                         else
 247                                 wsi->reason_bf &= ~1;
 248                         break;
 249                 }
 250 #endif
 251
 252                 break;
 253
 254 #ifdef LWS_WITH_CGI
 255         /* CGI IO events (POLLIN/OUT) appear here, our default policy is:
 256          *
 257          *  - POST data goes on subprocess stdin
 258          *  - subprocess stdout goes on http via writeable callback
 259          *  - subprocess stderr goes to the logs
 260          */
 261         case LWS_CALLBACK_CGI:
 262                 args = (struct lws_cgi_args *)in;
 263                 switch (args->ch) { /* which of stdin/out/err ? */
 264                 case LWS_STDIN:
 265                         /* TBD stdin rx flow control */
 266                         break;
 267                 case LWS_STDOUT:
 268                         wsi->reason_bf |= 1;
 269                         /* when writing to MASTER would not block */
 270                         lws_callback_on_writable(wsi);
 271                         break;
 272                 case LWS_STDERR:
 273                         n = read(lws_get_socket_fd(args->stdwsi[LWS_STDERR]),
 274                                                    buf, sizeof(buf) - 2);
 275                         if (n > 0) {
 276                                 if (buf[n - 1] != '\n')
 277                                         buf[n++] = '\n';
 278                                 buf[n] = '\0';
 279                                 lwsl_notice("CGI-stderr: %s\n", buf);
 280                         }
 281                         break;
 282                 }
 283                 break;
 284
 285         case LWS_CALLBACK_CGI_TERMINATED:
 286                 return -1;
 287
 288         case LWS_CALLBACK_CGI_STDIN_DATA:  /* POST body for stdin */
 289                 args = (struct lws_cgi_args *)in;
 290                 args->data[args->len] = '\0';
 291                 n = write(lws_get_socket_fd(args->stdwsi[LWS_STDIN]),
 292                           args->data, args->len);
 293                 if (n < args->len)
 294                         lwsl_notice("LWS_CALLBACK_CGI_STDIN_DATA: "
 295                                     "sent %d only %d went", n, args->len);
 296                 return n;
 297 #endif
 298         default:
 299                 break;
 300         }
 301
 302         return 0;
 303 }
 304
 305 /* list of supported protocols and callbacks */
 306
 307 static const struct lws_protocols protocols_dummy[] = {
 308         /* first protocol must always be HTTP handler */
 309
 310         {
 311                 "http-only",            /* name */
 312                 lws_callback_http_dummy,                /* callback */
 313                 0,      /* per_session_data_size */
 314                 0,                      /* max frame size / rx buffer */
 315                 0, NULL, 0
 316         },
 317         /*
 318          * the other protocols are provided by lws plugins
 319          */
 320         { NULL, NULL, 0, 0, 0, NULL, 0} /* terminator */
 321 };
 322
 323 #ifdef LWS_PLAT_OPTEE
 324 #undef LWS_HAVE_GETENV
 325 #endif
 326
 327 LWS_VISIBLE struct lws_vhost *
 328 lws_create_vhost(struct lws_context *context,
 329                  struct lws_context_creation_info *info)
 330 {
 331         struct lws_vhost *vh = lws_zalloc(sizeof(*vh)),
 332                          **vh1 = &context->vhost_list;
 333         const struct lws_http_mount *mounts;
 334         const struct lws_protocol_vhost_options *pvo;
 335 #ifdef LWS_WITH_PLUGINS
 336         struct lws_plugin *plugin = context->plugin_list;
 337 #endif
 338         struct lws_protocols *lwsp;
 339         int m, f = !info->pvo;
 340 #ifdef LWS_HAVE_GETENV
 341         char *p;
 342 #endif
 343         int n;
 344
 345         if (!vh)
 346                 return NULL;
 347
 348         if (!info->protocols)
 349                 info->protocols = &protocols_dummy[0];
 350
 351         vh->context = context;
 352         if (!info->vhost_name)
 353                 vh->name = "default";
 354         else
 355                 vh->name = info->vhost_name;
 356
 357         vh->iface = info->iface;
 358 #if !defined(LWS_WITH_ESP8266) && !defined(LWS_WITH_ESP32) && !defined(OPTEE_TA) && !defined(WIN32)
 359         vh->bind_iface = info->bind_iface;
 360 #endif
 361
 362         for (vh->count_protocols = 0;
 363              info->protocols[vh->count_protocols].callback;
 364              vh->count_protocols++)
 365                 ;
 366
 367         vh->options = info->options;
 368         vh->pvo = info->pvo;
 369         vh->headers = info->headers;
 370         if (info->keepalive_timeout)
 371                 vh->keepalive_timeout = info->keepalive_timeout;
 372         else
 373                 vh->keepalive_timeout = 5;
 374
 375         /*
 376          * give the vhost a unified list of protocols including the
 377          * ones that came from plugins
 378          */
 379         lwsp = lws_zalloc(sizeof(struct lws_protocols) *
 380                                    (vh->count_protocols +
 381                                    context->plugin_protocol_count + 1));
 382         if (!lwsp) {
 383                 lwsl_err("OOM\n");
 384                 return NULL;
 385         }
 386
 387         m = vh->count_protocols;
 388         memcpy(lwsp, info->protocols, sizeof(struct lws_protocols) * m);
 389
 390         /* for compatibility, all protocols enabled on vhost if only
 391          * the default vhost exists.  Otherwise only vhosts who ask
 392          * for a protocol get it enabled.
 393          */
 394
 395         if (info->options & LWS_SERVER_OPTION_EXPLICIT_VHOSTS)
 396                 f = 0;
 397         (void)f;
 398 #ifdef LWS_WITH_PLUGINS
 399         if (plugin) {
 400
 401                 while (plugin) {
 402                         for (n = 0; n < plugin->caps.count_protocols; n++) {
 403                                 /*
 404                                  * for compatibility's sake, no pvo implies
 405                                  * allow all protocols
 406                                  */
 407                                 if (f || lws_vhost_protocol_options(vh,
 408                                     plugin->caps.protocols[n].name)) {
 409                                         memcpy(&lwsp[m],
 410                                                &plugin->caps.protocols[n],
 411                                                sizeof(struct lws_protocols));
 412                                         m++;
 413                                         vh->count_protocols++;
 414                                 }
 415                         }
 416                         plugin = plugin->list;
 417                 }
 418         }
 419 #endif
 420
 421         if (
 422 #ifdef LWS_WITH_PLUGINS
 423             (context->plugin_list) ||
 424 #endif
 425             info->options & LWS_SERVER_OPTION_EXPLICIT_VHOSTS)
 426                 vh->protocols = lwsp;
 427         else {
 428                 vh->protocols = info->protocols;
 429                 free(lwsp);
 430         }
 431
 432         vh->same_vh_protocol_list = (struct lws **)
 433                         lws_zalloc(sizeof(struct lws *) * vh->count_protocols);
 434
 435         vh->mount_list = info->mounts;
 436
 437 #ifdef LWS_USE_UNIX_SOCK
 438         if (LWS_UNIX_SOCK_ENABLED(context)) {
 439                 lwsl_notice("Creating Vhost '%s' path \"%s\", %d protocols\n",
 440                                 vh->name, info->iface, vh->count_protocols);
 441         } else
 442 #endif
 443         lwsl_notice("Creating Vhost '%s' port %d, %d protocols, IPv6 %s\n",
 444                         vh->name, info->port, vh->count_protocols, LWS_IPV6_ENABLED(vh) ? "on" : "off");
 445
 446         mounts = info->mounts;
 447         while (mounts) {
 448                 lwsl_notice("   mounting %s%s to %s\n",
 449                                 mount_protocols[mounts->origin_protocol],
 450                                 mounts->origin, mounts->mountpoint);
 451
 452                 /* convert interpreter protocol names to pointers */
 453                 pvo = mounts->interpret;
 454                 while (pvo) {
 455                         for (n = 0; n < vh->count_protocols; n++)
 456                                 if (!strcmp(pvo->value, vh->protocols[n].name)) {
 457                                         ((struct lws_protocol_vhost_options *)pvo)->value =
 458                                                         (const char *)(long)n;
 459                                         break;
 460                                 }
 461                         if (n == vh->count_protocols)
 462                                 lwsl_err("ignoring unknown interpret protocol %s\n", pvo->value);
 463                         pvo = pvo->next;
 464                 }
 465
 466                 mounts = mounts->mount_next;
 467         }
 468
 469 #ifndef LWS_NO_EXTENSIONS
 470 #ifdef LWS_WITH_PLUGINS
 471         if (context->plugin_extension_count) {
 472
 473                 m = 0;
 474                 while (info->extensions && info->extensions[m].callback)
 475                         m++;
 476
 477                 /*
 478                  * give the vhost a unified list of extensions including the
 479                  * ones that came from plugins
 480                  */
 481                 vh->extensions = lws_zalloc(sizeof(struct lws_extension) *
 482                                            (m +
 483                                            context->plugin_extension_count + 1));
 484                 if (!vh->extensions)
 485                         return NULL;
 486
 487                 memcpy((struct lws_extension *)vh->extensions, info->extensions,
 488                        sizeof(struct lws_extension) * m);
 489                 plugin = context->plugin_list;
 490                 while (plugin) {
 491                         memcpy((struct lws_extension *)&vh->extensions[m],
 492                                 plugin->caps.extensions,
 493                                sizeof(struct lws_extension) *
 494                                plugin->caps.count_extensions);
 495                         m += plugin->caps.count_extensions;
 496                         plugin = plugin->list;
 497                 }
 498         } else
 499 #endif
 500                 vh->extensions = info->extensions;
 501 #endif
 502
 503         vh->listen_port = info->port;
 504 #if !defined(LWS_WITH_ESP8266)
 505         vh->http_proxy_port = 0;
 506         vh->http_proxy_address[0] = '\0';
 507 #if defined(LWS_WITH_SOCKS5)
 508         vh->socks_proxy_port = 0;
 509         vh->socks_proxy_address[0] = '\0';
 510 #endif
 511
 512         /* either use proxy from info, or try get it from env var */
 513
 514         /* http proxy */
 515         if (info->http_proxy_address) {
 516                 /* override for backwards compatibility */
 517                 if (info->http_proxy_port)
 518                         vh->http_proxy_port = info->http_proxy_port;
 519                 lws_set_proxy(vh, info->http_proxy_address);
 520         } else {
 521 #ifdef LWS_HAVE_GETENV
 522                 p = getenv("http_proxy");
 523                 if (p)
 524                         lws_set_proxy(vh, p);
 525 #endif
 526         }
 527 #if defined(LWS_WITH_SOCKS5)
 528         /* socks proxy */
 529         if (info->socks_proxy_address) {
 530                 /* override for backwards compatibility */
 531                 if (info->socks_proxy_port)
 532                         vh->socks_proxy_port = info->socks_proxy_port;
 533                 lws_set_socks(vh, info->socks_proxy_address);
 534         } else {
 535 #ifdef LWS_HAVE_GETENV
 536                 p = getenv("socks_proxy");
 537                 if (p)
 538                         lws_set_socks(vh, p);
 539 #endif
 540         }
 541 #endif
 542 #endif
 543
 544         vh->ka_time = info->ka_time;
 545         vh->ka_interval = info->ka_interval;
 546         vh->ka_probes = info->ka_probes;
 547
 548         if (vh->options & LWS_SERVER_OPTION_STS)
 549                 lwsl_notice("   STS enabled\n");
 550
 551 #ifdef LWS_WITH_ACCESS_LOG
 552         if (info->log_filepath) {
 553                 vh->log_fd = open(info->log_filepath, O_CREAT | O_APPEND | O_RDWR, 0600);
 554                 if (vh->log_fd == (int)LWS_INVALID_FILE) {
 555                         lwsl_err("unable to open log filepath %s\n",
 556                                  info->log_filepath);
 557                         goto bail;
 558                 }
 559 #ifndef WIN32
 560                 if (context->uid != -1)
 561                         if (chown(info->log_filepath, context->uid,
 562                                   context->gid) == -1)
 563                                 lwsl_err("unable to chown log file %s\n",
 564                                                 info->log_filepath);
 565 #endif
 566         } else
 567                 vh->log_fd = (int)LWS_INVALID_FILE;
 568 #endif
 569         if (lws_context_init_server_ssl(info, vh))
 570                 goto bail;
 571         if (lws_context_init_client_ssl(info, vh))
 572                 goto bail;
 573         if (lws_context_init_server(info, vh)) {
 574                 lwsl_err("init server failed\n");
 575                 goto bail;
 576         }
 577
 578         while (1) {
 579                 if (!(*vh1)) {
 580                         *vh1 = vh;
 581                         break;
 582                 }
 583                 vh1 = &(*vh1)->vhost_next;
 584         };
 585         /* for the case we are adding a vhost much later, after server init */
 586
 587         if (context->protocol_init_done)
 588                 lws_protocol_init(context);
 589
 590         return vh;
 591
 592 bail:
 593         lws_free(vh);
 594
 595         return NULL;
 596 }
 597
 598 LWS_VISIBLE int
 599 lws_init_vhost_client_ssl(const struct lws_context_creation_info *info,
 600                           struct lws_vhost *vhost)
 601 {
 602         struct lws_context_creation_info i;
 603
 604         memcpy(&i, info, sizeof(i));
 605         i.port = CONTEXT_PORT_NO_LISTEN;
 606
 607         return lws_context_init_client_ssl(&i, vhost);
 608 }
 609
 610 LWS_VISIBLE struct lws_context *
 611 lws_create_context(struct lws_context_creation_info *info)
 612 {
 613         struct lws_context *context = NULL;
 614         struct lws_plat_file_ops *prev;
 615 #ifndef LWS_NO_DAEMONIZE
 616         int pid_daemon = get_daemonize_pid();
 617 #endif
 618         int n, m;
 619 #if defined(__ANDROID__)
 620         struct rlimit rt;
 621 #endif
 622
 623         lwsl_notice("Initial logging level %d\n", log_level);
 624         lwsl_notice("Libwebsockets version: %s\n", library_version);
 625 #if defined(GCC_VER)
 626         lwsl_notice("Compiled with  %s\n", GCC_VER);
 627 #endif
 628 #if LWS_POSIX
 629 #ifdef LWS_USE_IPV6
 630         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_DISABLE_IPV6))
 631                 lwsl_notice("IPV6 compiled in and enabled\n");
 632         else
 633                 lwsl_notice("IPV6 compiled in but disabled\n");
 634 #else
 635         lwsl_notice("IPV6 not compiled in\n");
 636 #endif
 637 #if !defined(LWS_PLAT_OPTEE) && !defined(LWS_PLAT_ESP32)
 638         lws_feature_status_libev(info);
 639         lws_feature_status_libuv(info);
 640 #endif
 641 #endif
 642         lwsl_info(" LWS_DEF_HEADER_LEN    : %u\n", LWS_DEF_HEADER_LEN);
 643         lwsl_info(" LWS_MAX_PROTOCOLS     : %u\n", LWS_MAX_PROTOCOLS);
 644         lwsl_info(" LWS_MAX_SMP           : %u\n", LWS_MAX_SMP);
 645         lwsl_info(" SPEC_LATEST_SUPPORTED : %u\n", SPEC_LATEST_SUPPORTED);
 646         lwsl_info(" sizeof (*info)        : %ld\n", (long)sizeof(*info));
 647 #if defined(LWS_WITH_STATS)
 648         lwsl_notice(" LWS_WITH_STATS        : on\n");
 649 #endif
 650 #if LWS_POSIX
 651         lwsl_info(" SYSTEM_RANDOM_FILEPATH: '%s'\n", SYSTEM_RANDOM_FILEPATH);
 652 #endif
 653         if (lws_plat_context_early_init())
 654                 return NULL;
 655
 656         context = lws_zalloc(sizeof(struct lws_context));
 657         if (!context) {
 658                 lwsl_err("No memory for websocket context\n");
 659                 return NULL;
 660         }
 661         if (info->pt_serv_buf_size)
 662                 context->pt_serv_buf_size = info->pt_serv_buf_size;
 663         else
 664                 context->pt_serv_buf_size = 4096;
 665
 666         /* default to just the platform fops implementation */
 667
 668         context->fops_platform.LWS_FOP_OPEN     = _lws_plat_file_open;
 669         context->fops_platform.LWS_FOP_CLOSE    = _lws_plat_file_close;
 670         context->fops_platform.LWS_FOP_SEEK_CUR = _lws_plat_file_seek_cur;
 671         context->fops_platform.LWS_FOP_READ     = _lws_plat_file_read;
 672         context->fops_platform.LWS_FOP_WRITE    = _lws_plat_file_write;
 673         context->fops_platform.fi[0].sig        = NULL;
 674
 675         /*
 676          *  arrange a linear linked-list of fops starting from context->fops
 677          *
 678          * platform fops
 679          * [ -> fops_zip (copied into context so .next settable) ]
 680          * [ -> info->fops ]
 681          */
 682
 683         context->fops = &context->fops_platform;
 684         prev = (struct lws_plat_file_ops *)context->fops;
 685
 686 #if defined(LWS_WITH_ZIP_FOPS)
 687         /* make a soft copy so we can set .next */
 688         context->fops_zip = fops_zip;
 689         prev->next = &context->fops_zip;
 690         prev = (struct lws_plat_file_ops *)prev->next;
 691 #endif
 692
 693         /* if user provided fops, tack them on the end of the list */
 694         if (info->fops)
 695                 prev->next = info->fops;
 696
 697         context->reject_service_keywords = info->reject_service_keywords;
 698         if (info->external_baggage_free_on_destroy)
 699                 context->external_baggage_free_on_destroy =
 700                         info->external_baggage_free_on_destroy;
 701
 702         context->time_up = time(NULL);
 703
 704         context->simultaneous_ssl_restriction = info->simultaneous_ssl_restriction;
 705
 706 #ifndef LWS_NO_DAEMONIZE
 707         if (pid_daemon) {
 708                 context->started_with_parent = pid_daemon;
 709                 lwsl_notice(" Started with daemon pid %d\n", pid_daemon);
 710         }
 711 #endif
 712 #if defined(__ANDROID__)
 713                 n = getrlimit ( RLIMIT_NOFILE,&rt);
 714                 if (-1 == n) {
 715                         lwsl_err("Get RLIMIT_NOFILE failed!\n");
 716                         return NULL;
 717                 }
 718                 context->max_fds = rt.rlim_cur;
 719 #else
 720                 context->max_fds = getdtablesize();
 721 #endif
 722
 723         if (info->count_threads)
 724                 context->count_threads = info->count_threads;
 725         else
 726                 context->count_threads = 1;
 727
 728         if (context->count_threads > LWS_MAX_SMP)
 729                 context->count_threads = LWS_MAX_SMP;
 730
 731         context->token_limits = info->token_limits;
 732
 733         context->options = info->options;
 734
 735         if (info->timeout_secs)
 736                 context->timeout_secs = info->timeout_secs;
 737         else
 738                 context->timeout_secs = AWAITING_TIMEOUT;
 739
 740         context->ws_ping_pong_interval = info->ws_ping_pong_interval;
 741
 742         lwsl_info(" default timeout (secs): %u\n", context->timeout_secs);
 743
 744         if (info->max_http_header_data)
 745                 context->max_http_header_data = info->max_http_header_data;
 746         else
 747                 if (info->max_http_header_data2)
 748                         context->max_http_header_data =
 749                                         info->max_http_header_data2;
 750                 else
 751                         context->max_http_header_data = LWS_DEF_HEADER_LEN;
 752         if (info->max_http_header_pool)
 753                 context->max_http_header_pool = info->max_http_header_pool;
 754         else
 755                 context->max_http_header_pool = LWS_DEF_HEADER_POOL;
 756
 757         /*
 758          * Allocate the per-thread storage for scratchpad buffers,
 759          * and header data pool
 760          */
 761         for (n = 0; n < context->count_threads; n++) {
 762                 context->pt[n].serv_buf = lws_zalloc(context->pt_serv_buf_size);
 763                 if (!context->pt[n].serv_buf) {
 764                         lwsl_err("OOM\n");
 765                         return NULL;
 766                 }
 767
 768 #ifdef LWS_USE_LIBUV
 769                 context->pt[n].context = context;
 770 #endif
 771                 context->pt[n].tid = n;
 772                 context->pt[n].http_header_data = lws_malloc(context->max_http_header_data *
 773                                                        context->max_http_header_pool);
 774                 if (!context->pt[n].http_header_data)
 775                         goto bail;
 776
 777                 context->pt[n].ah_pool = lws_zalloc(sizeof(struct allocated_headers) *
 778                                               context->max_http_header_pool);
 779                 for (m = 0; m < context->max_http_header_pool; m++)
 780                         context->pt[n].ah_pool[m].data =
 781                                 (char *)context->pt[n].http_header_data +
 782                                 (m * context->max_http_header_data);
 783                 if (!context->pt[n].ah_pool)
 784                         goto bail;
 785
 786                 lws_pt_mutex_init(&context->pt[n]);
 787         }
 788
 789         if (info->fd_limit_per_thread)
 790                 context->fd_limit_per_thread = info->fd_limit_per_thread;
 791         else
 792                 context->fd_limit_per_thread = context->max_fds /
 793                                                context->count_threads;
 794
 795         lwsl_notice(" Threads: %d each %d fds\n", context->count_threads,
 796                     context->fd_limit_per_thread);
 797
 798         if (!info->ka_interval && info->ka_time > 0) {
 799                 lwsl_err("info->ka_interval can't be 0 if ka_time used\n");
 800                 return NULL;
 801         }
 802
 803 #ifdef LWS_USE_LIBEV
 804         /* (Issue #264) In order to *avoid breaking backwards compatibility*, we
 805          * enable libev mediated SIGINT handling with a default handler of
 806          * lws_sigint_cb. The handler can be overridden or disabled
 807          * by invoking lws_sigint_cfg after creating the context, but
 808          * before invoking lws_initloop:
 809          */
 810         context->use_ev_sigint = 1;
 811         context->lws_ev_sigint_cb = &lws_ev_sigint_cb;
 812 #endif /* LWS_USE_LIBEV */
 813 #ifdef LWS_USE_LIBUV
 814         /* (Issue #264) In order to *avoid breaking backwards compatibility*, we
 815          * enable libev mediated SIGINT handling with a default handler of
 816          * lws_sigint_cb. The handler can be overridden or disabled
 817          * by invoking lws_sigint_cfg after creating the context, but
 818          * before invoking lws_initloop:
 819          */
 820         context->use_ev_sigint = 1;
 821         context->lws_uv_sigint_cb = &lws_uv_sigint_cb;
 822 #endif
 823 #ifdef LWS_USE_LIBEVENT
 824         /* (Issue #264) In order to *avoid breaking backwards compatibility*, we
 825          * enable libev mediated SIGINT handling with a default handler of
 826          * lws_sigint_cb. The handler can be overridden or disabled
 827          * by invoking lws_sigint_cfg after creating the context, but
 828          * before invoking lws_initloop:
 829          */
 830         context->use_ev_sigint = 1;
 831         context->lws_event_sigint_cb = &lws_event_sigint_cb;
 832 #endif /* LWS_USE_LIBEVENT */
 833
 834         lwsl_info(" mem: context:         %5lu bytes (%ld ctx + (%ld thr x %d))\n",
 835                   (long)sizeof(struct lws_context) +
 836                   (context->count_threads * context->pt_serv_buf_size),
 837                   (long)sizeof(struct lws_context),
 838                   (long)context->count_threads,
 839                   context->pt_serv_buf_size);
 840
 841         lwsl_info(" mem: http hdr rsvd:   %5lu bytes (%u thr x (%u + %lu) x %u))\n",
 842                     (long)(context->max_http_header_data +
 843                      sizeof(struct allocated_headers)) *
 844                     context->max_http_header_pool * context->count_threads,
 845                     context->count_threads,
 846                     context->max_http_header_data,
 847                     (long)sizeof(struct allocated_headers),
 848                     context->max_http_header_pool);
 849         n = sizeof(struct lws_pollfd) * context->count_threads *
 850             context->fd_limit_per_thread;
 851         context->pt[0].fds = lws_zalloc(n);
 852         if (context->pt[0].fds == NULL) {
 853                 lwsl_err("OOM allocating %d fds\n", context->max_fds);
 854                 goto bail;
 855         }
 856         lwsl_info(" mem: pollfd map:      %5u\n", n);
 857
 858         if (info->server_string) {
 859                 context->server_string = info->server_string;
 860                 context->server_string_len = (short)
 861                                 strlen(context->server_string);
 862         }
 863
 864 #if LWS_MAX_SMP > 1
 865         /* each thread serves his own chunk of fds */
 866         for (n = 1; n < (int)info->count_threads; n++)
 867                 context->pt[n].fds = context->pt[n - 1].fds +
 868                                      context->fd_limit_per_thread;
 869 #endif
 870
 871         if (lws_plat_init(context, info))
 872                 goto bail;
 873
 874         lws_context_init_ssl_library(info);
 875
 876         context->user_space = info->user;
 877
 878         /*
 879          * if he's not saying he'll make his own vhosts later then act
 880          * compatibly and make a default vhost using the data in the info
 881          */
 882         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
 883                 if (!lws_create_vhost(context, info)) {
 884                         lwsl_err("Failed to create default vhost\n");
 885                         return NULL;
 886                 }
 887
 888         lws_context_init_extensions(info, context);
 889
 890         lwsl_notice(" mem: per-conn:        %5lu bytes + protocol rx buf\n",
 891                     (unsigned long)sizeof(struct lws));
 892
 893         strcpy(context->canonical_hostname, "unknown");
 894         lws_server_get_canonical_hostname(context, info);
 895
 896         context->uid = info->uid;
 897         context->gid = info->gid;
 898
 899 #if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
 900         memcpy(context->caps, info->caps, sizeof(context->caps));
 901         context->count_caps = info->count_caps;
 902 #endif
 903
 904         /*
 905          * drop any root privs for this process
 906          * to listen on port < 1023 we would have needed root, but now we are
 907          * listening, we don't want the power for anything else
 908          */
 909         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
 910                 lws_plat_drop_app_privileges(info);
 911
 912         /*
 913          * give all extensions a chance to create any per-context
 914          * allocations they need
 915          */
 916         if (info->port != CONTEXT_PORT_NO_LISTEN) {
 917                 if (lws_ext_cb_all_exts(context, NULL,
 918                         LWS_EXT_CB_SERVER_CONTEXT_CONSTRUCT, NULL, 0) < 0)
 919                         goto bail;
 920         } else
 921                 if (lws_ext_cb_all_exts(context, NULL,
 922                         LWS_EXT_CB_CLIENT_CONTEXT_CONSTRUCT, NULL, 0) < 0)
 923                         goto bail;
 924
 925         return context;
 926
 927 bail:
 928         lws_context_destroy(context);
 929         return NULL;
 930 }
 931
 932 LWS_VISIBLE LWS_EXTERN void
 933 lws_context_deprecate(struct lws_context *context, lws_reload_func cb)
 934 {
 935         struct lws_vhost *vh = context->vhost_list, *vh1;
 936         struct lws *wsi;
 937
 938         /*
 939          * "deprecation" means disable the context from accepting any new
 940          * connections and free up listen sockets to be used by a replacement
 941          * context.
 942          *
 943          * Otherwise the deprecated context remains operational, until its
 944          * number of connected sockets falls to zero, when it is deleted.
 945          */
 946
 947         /* for each vhost, close his listen socket */
 948
 949         while (vh) {
 950                 wsi = vh->lserv_wsi;
 951                 if (wsi) {
 952                         wsi->socket_is_permanently_unusable = 1;
 953                         lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
 954                         wsi->context->deprecation_pending_listen_close_count++;
 955                         /*
 956                          * other vhosts can share the listen port, they
 957                          * point to the same wsi.  So zap those too.
 958                          */
 959                         vh1 = context->vhost_list;
 960                         while (vh1) {
 961                                 if (vh1->lserv_wsi == wsi)
 962                                         vh1->lserv_wsi = NULL;
 963                                 vh1 = vh1->vhost_next;
 964                         }
 965                 }
 966                 vh = vh->vhost_next;
 967         }
 968
 969         context->deprecated = 1;
 970         context->deprecation_cb = cb;
 971 }
 972
 973 LWS_VISIBLE LWS_EXTERN int
 974 lws_context_is_deprecated(struct lws_context *context)
 975 {
 976         return context->deprecated;
 977 }
 978
 979 LWS_VISIBLE void
 980 lws_context_destroy2(struct lws_context *context);
 981
 982 LWS_VISIBLE void
 983 lws_context_destroy(struct lws_context *context)
 984 {
 985         const struct lws_protocols *protocol = NULL;
 986         struct lws_context_per_thread *pt;
 987         struct lws_vhost *vh = NULL;
 988         struct lws wsi;
 989         int n, m;
 990
 991         if (!context) {
 992                 lwsl_notice("%s: ctx %p\n", __func__, context);
 993                 return;
 994         }
 995         if (context->being_destroyed1) {
 996                 lwsl_notice("%s: ctx %p: already being destroyed\n", __func__, context);
 997                 return;
 998         }
 999
1000         lwsl_notice("%s: ctx %p\n", __func__, context);
1001
1002         m = context->count_threads;
1003         context->being_destroyed = 1;
1004         context->being_destroyed1 = 1;
1005
1006         memset(&wsi, 0, sizeof(wsi));
1007         wsi.context = context;
1008
1009 #ifdef LWS_LATENCY
1010         if (context->worst_latency_info[0])
1011                 lwsl_notice("Worst latency: %s\n", context->worst_latency_info);
1012 #endif
1013
1014         while (m--) {
1015                 pt = &context->pt[m];
1016
1017                 for (n = 0; (unsigned int)n < context->pt[m].fds_count; n++) {
1018                         struct lws *wsi = wsi_from_fd(context, pt->fds[n].fd);
1019                         if (!wsi)
1020                                 continue;
1021
1022                         lws_close_free_wsi(wsi,
1023                                 LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY
1024                                 /* no protocol close */);
1025                         n--;
1026                 }
1027                 lws_pt_mutex_destroy(pt);
1028         }
1029
1030         /*
1031          * give all extensions a chance to clean up any per-context
1032          * allocations they might have made
1033          */
1034
1035         n = lws_ext_cb_all_exts(context, NULL,
1036                                 LWS_EXT_CB_SERVER_CONTEXT_DESTRUCT, NULL, 0);
1037
1038         n = lws_ext_cb_all_exts(context, NULL,
1039                                 LWS_EXT_CB_CLIENT_CONTEXT_DESTRUCT, NULL, 0);
1040
1041         /*
1042          * inform all the protocols that they are done and will have no more
1043          * callbacks.
1044          *
1045          * We can't free things until after the event loop shuts down.
1046          */
1047         if (context->protocol_init_done)
1048                 vh = context->vhost_list;
1049         while (vh) {
1050                 wsi.vhost = vh;
1051                 protocol = vh->protocols;
1052                 if (protocol) {
1053                         n = 0;
1054                         while (n < vh->count_protocols) {
1055                                 wsi.protocol = protocol;
1056                                 protocol->callback(&wsi, LWS_CALLBACK_PROTOCOL_DESTROY,
1057                                                    NULL, NULL, 0);
1058                                 protocol++;
1059                                 n++;
1060                         }
1061                 }
1062
1063                 vh = vh->vhost_next;
1064         }
1065
1066         for (n = 0; n < context->count_threads; n++) {
1067                 pt = &context->pt[n];
1068
1069                 lws_libev_destroyloop(context, n);
1070                 lws_libuv_destroyloop(context, n);
1071                 lws_libevent_destroyloop(context, n);
1072
1073                 lws_free_set_NULL(context->pt[n].serv_buf);
1074                 if (pt->ah_pool)
1075                         lws_free(pt->ah_pool);
1076                 if (pt->http_header_data)
1077                         lws_free(pt->http_header_data);
1078         }
1079         lws_plat_context_early_destroy(context);
1080
1081         if (context->pt[0].fds)
1082                 lws_free_set_NULL(context->pt[0].fds);
1083
1084         if (!LWS_LIBUV_ENABLED(context))
1085                 lws_context_destroy2(context);
1086 }
1087
1088 /*
1089  * call the second one after the event loop has been shut down cleanly
1090  */
1091
1092 LWS_VISIBLE void
1093 lws_context_destroy2(struct lws_context *context)
1094 {
1095         const struct lws_protocols *protocol = NULL;
1096         struct lws_vhost *vh = NULL, *vh1;
1097         int n;
1098
1099         lwsl_notice("%s: ctx %p\n", __func__, context);
1100
1101         /*
1102          * free all the per-vhost allocations
1103          */
1104
1105         vh = context->vhost_list;
1106         while (vh) {
1107                 protocol = vh->protocols;
1108                 if (protocol) {
1109                         n = 0;
1110                         while (n < vh->count_protocols) {
1111                                 if (vh->protocol_vh_privs &&
1112                                     vh->protocol_vh_privs[n]) {
1113                                         // lwsl_notice("   %s: freeing per-vhost protocol data %p\n", __func__, vh->protocol_vh_privs[n]);
1114                                         lws_free(vh->protocol_vh_privs[n]);
1115                                         vh->protocol_vh_privs[n] = NULL;
1116                                 }
1117                                 protocol++;
1118                                 n++;
1119                         }
1120                 }
1121                 if (vh->protocol_vh_privs)
1122                         lws_free(vh->protocol_vh_privs);
1123                 lws_ssl_SSL_CTX_destroy(vh);
1124                 lws_free(vh->same_vh_protocol_list);
1125 #ifdef LWS_WITH_PLUGINS
1126                 if (context->plugin_list)
1127                         lws_free((void *)vh->protocols);
1128 #else
1129                 if (vh->options & LWS_SERVER_OPTION_EXPLICIT_VHOSTS)
1130                         lws_free((void *)vh->protocols);
1131 #endif
1132 #ifdef LWS_WITH_PLUGINS
1133 #ifndef LWS_NO_EXTENSIONS
1134                 if (context->plugin_extension_count)
1135                         lws_free((void *)vh->extensions);
1136 #endif
1137 #endif
1138 #ifdef LWS_WITH_ACCESS_LOG
1139                 if (vh->log_fd != (int)LWS_INVALID_FILE)
1140                         close(vh->log_fd);
1141 #endif
1142
1143                 vh1 = vh->vhost_next;
1144                 lws_free(vh);
1145                 vh = vh1;
1146         }
1147
1148         lws_stats_log_dump(context);
1149
1150         lws_ssl_context_destroy(context);
1151         lws_plat_context_late_destroy(context);
1152
1153         if (context->external_baggage_free_on_destroy)
1154                 free(context->external_baggage_free_on_destroy);
1155
1156         lws_free(context);
1157 }