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 #if !defined(LWS_WITH_NO_LOGS)
  44 static const char * const mount_protocols[] = {
  45         "http://",
  46         "https://",
  47         "file://",
  48         "cgi://",
  49         ">http://",
  50         ">https://",
  51         "callback://"
  52 };
  53 #endif
  54
  55 LWS_VISIBLE void *
  56 lws_protocol_vh_priv_zalloc(struct lws_vhost *vhost, const struct lws_protocols *prot,
  57                             int size)
  58 {
  59         int n = 0;
  60
  61         /* allocate the vh priv array only on demand */
  62         if (!vhost->protocol_vh_privs) {
  63                 vhost->protocol_vh_privs = (void **)lws_zalloc(
  64                                 vhost->count_protocols * sizeof(void *));
  65                 if (!vhost->protocol_vh_privs)
  66                         return NULL;
  67         }
  68
  69         while (n < vhost->count_protocols && &vhost->protocols[n] != prot)
  70                 n++;
  71
  72         if (n == vhost->count_protocols) {
  73                 n = 0;
  74                 while (n < vhost->count_protocols &&
  75                        strcmp(vhost->protocols[n].name, prot->name))
  76                         n++;
  77
  78                 if (n == vhost->count_protocols)
  79                         return NULL;
  80         }
  81
  82         vhost->protocol_vh_privs[n] = lws_zalloc(size);
  83         return vhost->protocol_vh_privs[n];
  84 }
  85
  86 LWS_VISIBLE void *
  87 lws_protocol_vh_priv_get(struct lws_vhost *vhost, const struct lws_protocols *prot)
  88 {
  89         int n = 0;
  90
  91         if (!vhost->protocol_vh_privs)
  92                 return NULL;
  93
  94         while (n < vhost->count_protocols && &vhost->protocols[n] != prot)
  95                 n++;
  96
  97         if (n == vhost->count_protocols) {
  98                 n = 0;
  99                 while (n < vhost->count_protocols &&
 100                        strcmp(vhost->protocols[n].name, prot->name))
 101                         n++;
 102
 103                 if (n == vhost->count_protocols) {
 104                         lwsl_err("%s: unknown protocol %p\n", __func__, prot);
 105                         return NULL;
 106                 }
 107         }
 108
 109         return vhost->protocol_vh_privs[n];
 110 }
 111
 112 static const struct lws_protocol_vhost_options *
 113 lws_vhost_protocol_options(struct lws_vhost *vh, const char *name)
 114 {
 115         const struct lws_protocol_vhost_options *pvo = vh->pvo;
 116
 117         while (pvo) {
 118                 // lwsl_notice("%s: '%s' '%s'\n", __func__, pvo->name, name);
 119                 if (!strcmp(pvo->name, name))
 120                         return pvo;
 121                 pvo = pvo->next;
 122         }
 123
 124         return NULL;
 125 }
 126
 127 /*
 128  * inform every vhost that hasn't already done it, that
 129  * his protocols are initializing
 130  */
 131 LWS_VISIBLE int
 132 lws_protocol_init(struct lws_context *context)
 133 {
 134         struct lws_vhost *vh = context->vhost_list;
 135         const struct lws_protocol_vhost_options *pvo, *pvo1;
 136         struct lws wsi;
 137         int n;
 138
 139         memset(&wsi, 0, sizeof(wsi));
 140         wsi.context = context;
 141
 142         lwsl_info("%s\n", __func__);
 143
 144         while (vh) {
 145                 wsi.vhost = vh;
 146
 147                 /* only do the protocol init once for a given vhost */
 148                 if (vh->created_vhost_protocols)
 149                         goto next;
 150
 151                 /* initialize supported protocols on this vhost */
 152
 153                 for (n = 0; n < vh->count_protocols; n++) {
 154                         wsi.protocol = &vh->protocols[n];
 155                         if (!vh->protocols[n].name)
 156                                 continue;
 157                         pvo = lws_vhost_protocol_options(vh,
 158                                                          vh->protocols[n].name);
 159                         if (pvo) {
 160                                 /*
 161                                  * linked list of options specific to
 162                                  * vh + protocol
 163                                  */
 164                                 pvo1 = pvo;
 165                                 pvo = pvo1->options;
 166
 167                                 while (pvo) {
 168                                         lwsl_notice("    vh %s prot %s opt %s\n",
 169                                                         vh->name,
 170                                                         vh->protocols[n].name,
 171                                                         pvo->name);
 172
 173                                         if (!strcmp(pvo->name, "default")) {
 174                                                 lwsl_notice("Setting default "
 175                                                    "protocol for vh %s to %s\n",
 176                                                    vh->name,
 177                                                    vh->protocols[n].name);
 178                                                 vh->default_protocol_index = n;
 179                                         }
 180                                         if (!strcmp(pvo->name, "raw")) {
 181                                                 lwsl_notice("Setting raw "
 182                                                    "protocol for vh %s to %s\n",
 183                                                    vh->name,
 184                                                    vh->protocols[n].name);
 185                                                 vh->raw_protocol_index = n;
 186                                         }
 187                                         pvo = pvo->next;
 188                                 }
 189
 190                                 pvo = pvo1->options;
 191                         }
 192
 193                         /*
 194                          * inform all the protocols that they are doing their one-time
 195                          * initialization if they want to.
 196                          *
 197                          * NOTE the wsi is all zeros except for the context, vh and
 198                          * protocol ptrs so lws_get_context(wsi) etc can work
 199                          */
 200                         if (vh->protocols[n].callback(&wsi,
 201                                 LWS_CALLBACK_PROTOCOL_INIT, NULL,
 202                                 (void *)pvo, 0))
 203                                 return 1;
 204                 }
 205
 206                 vh->created_vhost_protocols = 1;
 207 next:
 208                 vh = vh->vhost_next;
 209         }
 210
 211         if (!context->protocol_init_done)
 212                 lws_finalize_startup(context);
 213
 214         context->protocol_init_done = 1;
 215
 216         return 0;
 217 }
 218
 219 LWS_VISIBLE int
 220 lws_callback_http_dummy(struct lws *wsi, enum lws_callback_reasons reason,
 221                     void *user, void *in, size_t len)
 222 {
 223 #ifdef LWS_WITH_CGI
 224         struct lws_cgi_args *args;
 225         char buf[128];
 226         int n;
 227 #endif
 228
 229         switch (reason) {
 230         case LWS_CALLBACK_HTTP:
 231 #ifndef LWS_NO_SERVER
 232                 if (lws_return_http_status(wsi, HTTP_STATUS_NOT_FOUND, NULL))
 233                         return -1;
 234
 235                 if (lws_http_transaction_completed(wsi))
 236 #endif
 237                         return -1;
 238                 break;
 239
 240         case LWS_CALLBACK_HTTP_WRITEABLE:
 241 #ifdef LWS_WITH_CGI
 242                 if (wsi->reason_bf & 1) {
 243                         if (lws_cgi_write_split_stdout_headers(wsi) < 0)
 244                                 return -1;
 245
 246                         if (wsi->reason_bf & 8)
 247                                 wsi->reason_bf &= ~8;
 248                         else
 249                                 wsi->reason_bf &= ~1;
 250                         break;
 251                 }
 252 #endif
 253
 254                 break;
 255
 256 #ifdef LWS_WITH_CGI
 257         /* CGI IO events (POLLIN/OUT) appear here, our default policy is:
 258          *
 259          *  - POST data goes on subprocess stdin
 260          *  - subprocess stdout goes on http via writeable callback
 261          *  - subprocess stderr goes to the logs
 262          */
 263         case LWS_CALLBACK_CGI:
 264                 args = (struct lws_cgi_args *)in;
 265                 switch (args->ch) { /* which of stdin/out/err ? */
 266                 case LWS_STDIN:
 267                         /* TBD stdin rx flow control */
 268                         break;
 269                 case LWS_STDOUT:
 270                         wsi->reason_bf |= 1;
 271                         /* when writing to MASTER would not block */
 272                         lws_callback_on_writable(wsi);
 273                         break;
 274                 case LWS_STDERR:
 275                         n = read(lws_get_socket_fd(args->stdwsi[LWS_STDERR]),
 276                                                    buf, sizeof(buf) - 2);
 277                         if (n > 0) {
 278                                 if (buf[n - 1] != '\n')
 279                                         buf[n++] = '\n';
 280                                 buf[n] = '\0';
 281                                 lwsl_notice("CGI-stderr: %s\n", buf);
 282                         }
 283                         break;
 284                 }
 285                 break;
 286
 287         case LWS_CALLBACK_CGI_TERMINATED:
 288                 return -1;
 289
 290         case LWS_CALLBACK_CGI_STDIN_DATA:  /* POST body for stdin */
 291                 args = (struct lws_cgi_args *)in;
 292                 args->data[args->len] = '\0';
 293                 n = write(lws_get_socket_fd(args->stdwsi[LWS_STDIN]),
 294                           args->data, args->len);
 295                 if (n < args->len)
 296                         lwsl_notice("LWS_CALLBACK_CGI_STDIN_DATA: "
 297                                     "sent %d only %d went", n, args->len);
 298                 return n;
 299 #endif
 300         default:
 301                 break;
 302         }
 303
 304         return 0;
 305 }
 306
 307 /* list of supported protocols and callbacks */
 308
 309 static const struct lws_protocols protocols_dummy[] = {
 310         /* first protocol must always be HTTP handler */
 311
 312         {
 313                 "http-only",            /* name */
 314                 lws_callback_http_dummy,                /* callback */
 315                 0,      /* per_session_data_size */
 316                 0,                      /* max frame size / rx buffer */
 317                 0, NULL, 0
 318         },
 319         /*
 320          * the other protocols are provided by lws plugins
 321          */
 322         { NULL, NULL, 0, 0, 0, NULL, 0} /* terminator */
 323 };
 324
 325 #ifdef LWS_PLAT_OPTEE
 326 #undef LWS_HAVE_GETENV
 327 #endif
 328
 329 LWS_VISIBLE struct lws_vhost *
 330 lws_create_vhost(struct lws_context *context,
 331                  struct lws_context_creation_info *info)
 332 {
 333         struct lws_vhost *vh = lws_zalloc(sizeof(*vh)),
 334                          **vh1 = &context->vhost_list;
 335         const struct lws_http_mount *mounts;
 336         const struct lws_protocol_vhost_options *pvo;
 337 #ifdef LWS_WITH_PLUGINS
 338         struct lws_plugin *plugin = context->plugin_list;
 339 #endif
 340         struct lws_protocols *lwsp;
 341         int m, f = !info->pvo;
 342 #ifdef LWS_HAVE_GETENV
 343         char *p;
 344 #endif
 345         int n;
 346
 347         if (!vh)
 348                 return NULL;
 349
 350         if (!info->protocols)
 351                 info->protocols = &protocols_dummy[0];
 352
 353         vh->context = context;
 354         if (!info->vhost_name)
 355                 vh->name = "default";
 356         else
 357                 vh->name = info->vhost_name;
 358
 359         vh->iface = info->iface;
 360 #if !defined(LWS_WITH_ESP8266) && !defined(LWS_WITH_ESP32) && !defined(OPTEE_TA) && !defined(WIN32)
 361         vh->bind_iface = info->bind_iface;
 362 #endif
 363
 364         for (vh->count_protocols = 0;
 365              info->protocols[vh->count_protocols].callback;
 366              vh->count_protocols++)
 367                 ;
 368
 369         vh->options = info->options;
 370         vh->pvo = info->pvo;
 371         vh->headers = info->headers;
 372         if (info->keepalive_timeout)
 373                 vh->keepalive_timeout = info->keepalive_timeout;
 374         else
 375                 vh->keepalive_timeout = 5;
 376
 377         /*
 378          * give the vhost a unified list of protocols including the
 379          * ones that came from plugins
 380          */
 381         lwsp = lws_zalloc(sizeof(struct lws_protocols) *
 382                                    (vh->count_protocols +
 383                                    context->plugin_protocol_count + 1));
 384         if (!lwsp) {
 385                 lwsl_err("OOM\n");
 386                 return NULL;
 387         }
 388
 389         m = vh->count_protocols;
 390         memcpy(lwsp, info->protocols, sizeof(struct lws_protocols) * m);
 391
 392         /* for compatibility, all protocols enabled on vhost if only
 393          * the default vhost exists.  Otherwise only vhosts who ask
 394          * for a protocol get it enabled.
 395          */
 396
 397         if (info->options & LWS_SERVER_OPTION_EXPLICIT_VHOSTS)
 398                 f = 0;
 399         (void)f;
 400 #ifdef LWS_WITH_PLUGINS
 401         if (plugin) {
 402
 403                 while (plugin) {
 404                         for (n = 0; n < plugin->caps.count_protocols; n++) {
 405                                 /*
 406                                  * for compatibility's sake, no pvo implies
 407                                  * allow all protocols
 408                                  */
 409                                 if (f || lws_vhost_protocol_options(vh,
 410                                     plugin->caps.protocols[n].name)) {
 411                                         memcpy(&lwsp[m],
 412                                                &plugin->caps.protocols[n],
 413                                                sizeof(struct lws_protocols));
 414                                         m++;
 415                                         vh->count_protocols++;
 416                                 }
 417                         }
 418                         plugin = plugin->list;
 419                 }
 420         }
 421 #endif
 422
 423         if (
 424 #ifdef LWS_WITH_PLUGINS
 425             (context->plugin_list) ||
 426 #endif
 427             info->options & LWS_SERVER_OPTION_EXPLICIT_VHOSTS)
 428                 vh->protocols = lwsp;
 429         else {
 430                 vh->protocols = info->protocols;
 431                 free(lwsp);
 432         }
 433
 434         vh->same_vh_protocol_list = (struct lws **)
 435                         lws_zalloc(sizeof(struct lws *) * vh->count_protocols);
 436
 437         vh->mount_list = info->mounts;
 438
 439 #ifdef LWS_USE_UNIX_SOCK
 440         if (LWS_UNIX_SOCK_ENABLED(context)) {
 441                 lwsl_notice("Creating Vhost '%s' path \"%s\", %d protocols\n",
 442                                 vh->name, info->iface, vh->count_protocols);
 443         } else
 444 #endif
 445         lwsl_notice("Creating Vhost '%s' port %d, %d protocols, IPv6 %s\n",
 446                         vh->name, info->port, vh->count_protocols, LWS_IPV6_ENABLED(vh) ? "on" : "off");
 447
 448         mounts = info->mounts;
 449         while (mounts) {
 450                 lwsl_notice("   mounting %s%s to %s\n",
 451                                 mount_protocols[mounts->origin_protocol],
 452                                 mounts->origin, mounts->mountpoint);
 453
 454                 /* convert interpreter protocol names to pointers */
 455                 pvo = mounts->interpret;
 456                 while (pvo) {
 457                         for (n = 0; n < vh->count_protocols; n++)
 458                                 if (!strcmp(pvo->value, vh->protocols[n].name)) {
 459                                         ((struct lws_protocol_vhost_options *)pvo)->value =
 460                                                         (const char *)(long)n;
 461                                         break;
 462                                 }
 463                         if (n == vh->count_protocols)
 464                                 lwsl_err("ignoring unknown interpret protocol %s\n", pvo->value);
 465                         pvo = pvo->next;
 466                 }
 467
 468                 mounts = mounts->mount_next;
 469         }
 470
 471 #ifndef LWS_NO_EXTENSIONS
 472 #ifdef LWS_WITH_PLUGINS
 473         if (context->plugin_extension_count) {
 474
 475                 m = 0;
 476                 while (info->extensions && info->extensions[m].callback)
 477                         m++;
 478
 479                 /*
 480                  * give the vhost a unified list of extensions including the
 481                  * ones that came from plugins
 482                  */
 483                 vh->extensions = lws_zalloc(sizeof(struct lws_extension) *
 484                                            (m +
 485                                            context->plugin_extension_count + 1));
 486                 if (!vh->extensions)
 487                         return NULL;
 488
 489                 memcpy((struct lws_extension *)vh->extensions, info->extensions,
 490                        sizeof(struct lws_extension) * m);
 491                 plugin = context->plugin_list;
 492                 while (plugin) {
 493                         memcpy((struct lws_extension *)&vh->extensions[m],
 494                                 plugin->caps.extensions,
 495                                sizeof(struct lws_extension) *
 496                                plugin->caps.count_extensions);
 497                         m += plugin->caps.count_extensions;
 498                         plugin = plugin->list;
 499                 }
 500         } else
 501 #endif
 502                 vh->extensions = info->extensions;
 503 #endif
 504
 505         vh->listen_port = info->port;
 506 #if !defined(LWS_WITH_ESP8266)
 507         vh->http_proxy_port = 0;
 508         vh->http_proxy_address[0] = '\0';
 509 #if defined(LWS_WITH_SOCKS5)
 510         vh->socks_proxy_port = 0;
 511         vh->socks_proxy_address[0] = '\0';
 512 #endif
 513
 514         /* either use proxy from info, or try get it from env var */
 515
 516         /* http proxy */
 517         if (info->http_proxy_address) {
 518                 /* override for backwards compatibility */
 519                 if (info->http_proxy_port)
 520                         vh->http_proxy_port = info->http_proxy_port;
 521                 lws_set_proxy(vh, info->http_proxy_address);
 522         } else {
 523 #ifdef LWS_HAVE_GETENV
 524                 p = getenv("http_proxy");
 525                 if (p)
 526                         lws_set_proxy(vh, p);
 527 #endif
 528         }
 529 #if defined(LWS_WITH_SOCKS5)
 530         /* socks proxy */
 531         if (info->socks_proxy_address) {
 532                 /* override for backwards compatibility */
 533                 if (info->socks_proxy_port)
 534                         vh->socks_proxy_port = info->socks_proxy_port;
 535                 lws_set_socks(vh, info->socks_proxy_address);
 536         } else {
 537 #ifdef LWS_HAVE_GETENV
 538                 p = getenv("socks_proxy");
 539                 if (p)
 540                         lws_set_socks(vh, p);
 541 #endif
 542         }
 543 #endif
 544 #endif
 545
 546         vh->ka_time = info->ka_time;
 547         vh->ka_interval = info->ka_interval;
 548         vh->ka_probes = info->ka_probes;
 549
 550         if (vh->options & LWS_SERVER_OPTION_STS)
 551                 lwsl_notice("   STS enabled\n");
 552
 553 #ifdef LWS_WITH_ACCESS_LOG
 554         if (info->log_filepath) {
 555                 vh->log_fd = open(info->log_filepath, O_CREAT | O_APPEND | O_RDWR, 0600);
 556                 if (vh->log_fd == (int)LWS_INVALID_FILE) {
 557                         lwsl_err("unable to open log filepath %s\n",
 558                                  info->log_filepath);
 559                         goto bail;
 560                 }
 561 #ifndef WIN32
 562                 if (context->uid != -1)
 563                         if (chown(info->log_filepath, context->uid,
 564                                   context->gid) == -1)
 565                                 lwsl_err("unable to chown log file %s\n",
 566                                                 info->log_filepath);
 567 #endif
 568         } else
 569                 vh->log_fd = (int)LWS_INVALID_FILE;
 570 #endif
 571         if (lws_context_init_server_ssl(info, vh))
 572                 goto bail;
 573         if (lws_context_init_client_ssl(info, vh))
 574                 goto bail;
 575         if (lws_context_init_server(info, vh)) {
 576                 lwsl_err("init server failed\n");
 577                 goto bail;
 578         }
 579
 580         while (1) {
 581                 if (!(*vh1)) {
 582                         *vh1 = vh;
 583                         break;
 584                 }
 585                 vh1 = &(*vh1)->vhost_next;
 586         };
 587         /* for the case we are adding a vhost much later, after server init */
 588
 589         if (context->protocol_init_done)
 590                 lws_protocol_init(context);
 591
 592         return vh;
 593
 594 bail:
 595         lws_free(vh);
 596
 597         return NULL;
 598 }
 599
 600 LWS_VISIBLE int
 601 lws_init_vhost_client_ssl(const struct lws_context_creation_info *info,
 602                           struct lws_vhost *vhost)
 603 {
 604         struct lws_context_creation_info i;
 605
 606         memcpy(&i, info, sizeof(i));
 607         i.port = CONTEXT_PORT_NO_LISTEN;
 608
 609         return lws_context_init_client_ssl(&i, vhost);
 610 }
 611
 612 LWS_VISIBLE struct lws_context *
 613 lws_create_context(struct lws_context_creation_info *info)
 614 {
 615         struct lws_context *context = NULL;
 616         struct lws_plat_file_ops *prev;
 617 #ifndef LWS_NO_DAEMONIZE
 618         int pid_daemon = get_daemonize_pid();
 619 #endif
 620         int n, m;
 621 #if defined(__ANDROID__)
 622         struct rlimit rt;
 623 #endif
 624
 625         lwsl_notice("Initial logging level %d\n", log_level);
 626         lwsl_notice("Libwebsockets version: %s\n", library_version);
 627 #if defined(GCC_VER)
 628         lwsl_notice("Compiled with  %s\n", GCC_VER);
 629 #endif
 630 #if LWS_POSIX
 631 #ifdef LWS_USE_IPV6
 632         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_DISABLE_IPV6))
 633                 lwsl_notice("IPV6 compiled in and enabled\n");
 634         else
 635                 lwsl_notice("IPV6 compiled in but disabled\n");
 636 #else
 637         lwsl_notice("IPV6 not compiled in\n");
 638 #endif
 639 #if !defined(LWS_PLAT_OPTEE) && !defined(LWS_PLAT_ESP32)
 640         lws_feature_status_libev(info);
 641         lws_feature_status_libuv(info);
 642 #endif
 643 #endif
 644         lwsl_info(" LWS_DEF_HEADER_LEN    : %u\n", LWS_DEF_HEADER_LEN);
 645         lwsl_info(" LWS_MAX_PROTOCOLS     : %u\n", LWS_MAX_PROTOCOLS);
 646         lwsl_info(" LWS_MAX_SMP           : %u\n", LWS_MAX_SMP);
 647         lwsl_info(" SPEC_LATEST_SUPPORTED : %u\n", SPEC_LATEST_SUPPORTED);
 648         lwsl_info(" sizeof (*info)        : %ld\n", (long)sizeof(*info));
 649 #if defined(LWS_WITH_STATS)
 650         lwsl_notice(" LWS_WITH_STATS        : on\n");
 651 #endif
 652 #if LWS_POSIX
 653         lwsl_info(" SYSTEM_RANDOM_FILEPATH: '%s'\n", SYSTEM_RANDOM_FILEPATH);
 654 #endif
 655         if (lws_plat_context_early_init())
 656                 return NULL;
 657
 658         context = lws_zalloc(sizeof(struct lws_context));
 659         if (!context) {
 660                 lwsl_err("No memory for websocket context\n");
 661                 return NULL;
 662         }
 663         if (info->pt_serv_buf_size)
 664                 context->pt_serv_buf_size = info->pt_serv_buf_size;
 665         else
 666                 context->pt_serv_buf_size = 4096;
 667
 668         /* default to just the platform fops implementation */
 669
 670         context->fops_platform.LWS_FOP_OPEN     = _lws_plat_file_open;
 671         context->fops_platform.LWS_FOP_CLOSE    = _lws_plat_file_close;
 672         context->fops_platform.LWS_FOP_SEEK_CUR = _lws_plat_file_seek_cur;
 673         context->fops_platform.LWS_FOP_READ     = _lws_plat_file_read;
 674         context->fops_platform.LWS_FOP_WRITE    = _lws_plat_file_write;
 675         context->fops_platform.fi[0].sig        = NULL;
 676
 677         /*
 678          *  arrange a linear linked-list of fops starting from context->fops
 679          *
 680          * platform fops
 681          * [ -> fops_zip (copied into context so .next settable) ]
 682          * [ -> info->fops ]
 683          */
 684
 685         context->fops = &context->fops_platform;
 686         prev = (struct lws_plat_file_ops *)context->fops;
 687
 688 #if defined(LWS_WITH_ZIP_FOPS)
 689         /* make a soft copy so we can set .next */
 690         context->fops_zip = fops_zip;
 691         prev->next = &context->fops_zip;
 692         prev = (struct lws_plat_file_ops *)prev->next;
 693 #endif
 694
 695         /* if user provided fops, tack them on the end of the list */
 696         if (info->fops)
 697                 prev->next = info->fops;
 698
 699         context->reject_service_keywords = info->reject_service_keywords;
 700         if (info->external_baggage_free_on_destroy)
 701                 context->external_baggage_free_on_destroy =
 702                         info->external_baggage_free_on_destroy;
 703
 704         context->time_up = time(NULL);
 705
 706         context->simultaneous_ssl_restriction = info->simultaneous_ssl_restriction;
 707
 708 #ifndef LWS_NO_DAEMONIZE
 709         if (pid_daemon) {
 710                 context->started_with_parent = pid_daemon;
 711                 lwsl_notice(" Started with daemon pid %d\n", pid_daemon);
 712         }
 713 #endif
 714 #if defined(__ANDROID__)
 715                 n = getrlimit ( RLIMIT_NOFILE,&rt);
 716                 if (-1 == n) {
 717                         lwsl_err("Get RLIMIT_NOFILE failed!\n");
 718                         return NULL;
 719                 }
 720                 context->max_fds = rt.rlim_cur;
 721 #else
 722                 context->max_fds = getdtablesize();
 723 #endif
 724
 725         if (info->count_threads)
 726                 context->count_threads = info->count_threads;
 727         else
 728                 context->count_threads = 1;
 729
 730         if (context->count_threads > LWS_MAX_SMP)
 731                 context->count_threads = LWS_MAX_SMP;
 732
 733         context->token_limits = info->token_limits;
 734
 735         context->options = info->options;
 736
 737         if (info->timeout_secs)
 738                 context->timeout_secs = info->timeout_secs;
 739         else
 740                 context->timeout_secs = AWAITING_TIMEOUT;
 741
 742         context->ws_ping_pong_interval = info->ws_ping_pong_interval;
 743
 744         lwsl_info(" default timeout (secs): %u\n", context->timeout_secs);
 745
 746         if (info->max_http_header_data)
 747                 context->max_http_header_data = info->max_http_header_data;
 748         else
 749                 if (info->max_http_header_data2)
 750                         context->max_http_header_data =
 751                                         info->max_http_header_data2;
 752                 else
 753                         context->max_http_header_data = LWS_DEF_HEADER_LEN;
 754         if (info->max_http_header_pool)
 755                 context->max_http_header_pool = info->max_http_header_pool;
 756         else
 757                 context->max_http_header_pool = LWS_DEF_HEADER_POOL;
 758
 759         /*
 760          * Allocate the per-thread storage for scratchpad buffers,
 761          * and header data pool
 762          */
 763         for (n = 0; n < context->count_threads; n++) {
 764                 context->pt[n].serv_buf = lws_zalloc(context->pt_serv_buf_size);
 765                 if (!context->pt[n].serv_buf) {
 766                         lwsl_err("OOM\n");
 767                         return NULL;
 768                 }
 769
 770 #ifdef LWS_USE_LIBUV
 771                 context->pt[n].context = context;
 772 #endif
 773                 context->pt[n].tid = n;
 774                 context->pt[n].http_header_data = lws_malloc(context->max_http_header_data *
 775                                                        context->max_http_header_pool);
 776                 if (!context->pt[n].http_header_data)
 777                         goto bail;
 778
 779                 context->pt[n].ah_pool = lws_zalloc(sizeof(struct allocated_headers) *
 780                                               context->max_http_header_pool);
 781                 for (m = 0; m < context->max_http_header_pool; m++)
 782                         context->pt[n].ah_pool[m].data =
 783                                 (char *)context->pt[n].http_header_data +
 784                                 (m * context->max_http_header_data);
 785                 if (!context->pt[n].ah_pool)
 786                         goto bail;
 787
 788                 lws_pt_mutex_init(&context->pt[n]);
 789         }
 790
 791         if (info->fd_limit_per_thread)
 792                 context->fd_limit_per_thread = info->fd_limit_per_thread;
 793         else
 794                 context->fd_limit_per_thread = context->max_fds /
 795                                                context->count_threads;
 796
 797         lwsl_notice(" Threads: %d each %d fds\n", context->count_threads,
 798                     context->fd_limit_per_thread);
 799
 800         if (!info->ka_interval && info->ka_time > 0) {
 801                 lwsl_err("info->ka_interval can't be 0 if ka_time used\n");
 802                 return NULL;
 803         }
 804
 805 #ifdef LWS_USE_LIBEV
 806         /* (Issue #264) In order to *avoid breaking backwards compatibility*, we
 807          * enable libev mediated SIGINT handling with a default handler of
 808          * lws_sigint_cb. The handler can be overridden or disabled
 809          * by invoking lws_sigint_cfg after creating the context, but
 810          * before invoking lws_initloop:
 811          */
 812         context->use_ev_sigint = 1;
 813         context->lws_ev_sigint_cb = &lws_ev_sigint_cb;
 814 #endif /* LWS_USE_LIBEV */
 815 #ifdef LWS_USE_LIBUV
 816         /* (Issue #264) In order to *avoid breaking backwards compatibility*, we
 817          * enable libev mediated SIGINT handling with a default handler of
 818          * lws_sigint_cb. The handler can be overridden or disabled
 819          * by invoking lws_sigint_cfg after creating the context, but
 820          * before invoking lws_initloop:
 821          */
 822         context->use_ev_sigint = 1;
 823         context->lws_uv_sigint_cb = &lws_uv_sigint_cb;
 824 #endif
 825 #ifdef LWS_USE_LIBEVENT
 826         /* (Issue #264) In order to *avoid breaking backwards compatibility*, we
 827          * enable libev mediated SIGINT handling with a default handler of
 828          * lws_sigint_cb. The handler can be overridden or disabled
 829          * by invoking lws_sigint_cfg after creating the context, but
 830          * before invoking lws_initloop:
 831          */
 832         context->use_ev_sigint = 1;
 833         context->lws_event_sigint_cb = &lws_event_sigint_cb;
 834 #endif /* LWS_USE_LIBEVENT */
 835
 836         lwsl_info(" mem: context:         %5lu bytes (%ld ctx + (%ld thr x %d))\n",
 837                   (long)sizeof(struct lws_context) +
 838                   (context->count_threads * context->pt_serv_buf_size),
 839                   (long)sizeof(struct lws_context),
 840                   (long)context->count_threads,
 841                   context->pt_serv_buf_size);
 842
 843         lwsl_info(" mem: http hdr rsvd:   %5lu bytes (%u thr x (%u + %lu) x %u))\n",
 844                     (long)(context->max_http_header_data +
 845                      sizeof(struct allocated_headers)) *
 846                     context->max_http_header_pool * context->count_threads,
 847                     context->count_threads,
 848                     context->max_http_header_data,
 849                     (long)sizeof(struct allocated_headers),
 850                     context->max_http_header_pool);
 851         n = sizeof(struct lws_pollfd) * context->count_threads *
 852             context->fd_limit_per_thread;
 853         context->pt[0].fds = lws_zalloc(n);
 854         if (context->pt[0].fds == NULL) {
 855                 lwsl_err("OOM allocating %d fds\n", context->max_fds);
 856                 goto bail;
 857         }
 858         lwsl_info(" mem: pollfd map:      %5u\n", n);
 859
 860         if (info->server_string) {
 861                 context->server_string = info->server_string;
 862                 context->server_string_len = (short)
 863                                 strlen(context->server_string);
 864         }
 865
 866 #if LWS_MAX_SMP > 1
 867         /* each thread serves his own chunk of fds */
 868         for (n = 1; n < (int)info->count_threads; n++)
 869                 context->pt[n].fds = context->pt[n - 1].fds +
 870                                      context->fd_limit_per_thread;
 871 #endif
 872
 873         if (lws_plat_init(context, info))
 874                 goto bail;
 875
 876         lws_context_init_ssl_library(info);
 877
 878         context->user_space = info->user;
 879
 880         /*
 881          * if he's not saying he'll make his own vhosts later then act
 882          * compatibly and make a default vhost using the data in the info
 883          */
 884         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
 885                 if (!lws_create_vhost(context, info)) {
 886                         lwsl_err("Failed to create default vhost\n");
 887                         return NULL;
 888                 }
 889
 890         lws_context_init_extensions(info, context);
 891
 892         lwsl_notice(" mem: per-conn:        %5lu bytes + protocol rx buf\n",
 893                     (unsigned long)sizeof(struct lws));
 894
 895         strcpy(context->canonical_hostname, "unknown");
 896         lws_server_get_canonical_hostname(context, info);
 897
 898         context->uid = info->uid;
 899         context->gid = info->gid;
 900
 901 #if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
 902         memcpy(context->caps, info->caps, sizeof(context->caps));
 903         context->count_caps = info->count_caps;
 904 #endif
 905
 906         /*
 907          * drop any root privs for this process
 908          * to listen on port < 1023 we would have needed root, but now we are
 909          * listening, we don't want the power for anything else
 910          */
 911         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
 912                 lws_plat_drop_app_privileges(info);
 913
 914         /*
 915          * give all extensions a chance to create any per-context
 916          * allocations they need
 917          */
 918         if (info->port != CONTEXT_PORT_NO_LISTEN) {
 919                 if (lws_ext_cb_all_exts(context, NULL,
 920                         LWS_EXT_CB_SERVER_CONTEXT_CONSTRUCT, NULL, 0) < 0)
 921                         goto bail;
 922         } else
 923                 if (lws_ext_cb_all_exts(context, NULL,
 924                         LWS_EXT_CB_CLIENT_CONTEXT_CONSTRUCT, NULL, 0) < 0)
 925                         goto bail;
 926
 927         return context;
 928
 929 bail:
 930         lws_context_destroy(context);
 931         return NULL;
 932 }
 933
 934 LWS_VISIBLE LWS_EXTERN void
 935 lws_context_deprecate(struct lws_context *context, lws_reload_func cb)
 936 {
 937         struct lws_vhost *vh = context->vhost_list, *vh1;
 938         struct lws *wsi;
 939
 940         /*
 941          * "deprecation" means disable the context from accepting any new
 942          * connections and free up listen sockets to be used by a replacement
 943          * context.
 944          *
 945          * Otherwise the deprecated context remains operational, until its
 946          * number of connected sockets falls to zero, when it is deleted.
 947          */
 948
 949         /* for each vhost, close his listen socket */
 950
 951         while (vh) {
 952                 wsi = vh->lserv_wsi;
 953                 if (wsi) {
 954                         wsi->socket_is_permanently_unusable = 1;
 955                         lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
 956                         wsi->context->deprecation_pending_listen_close_count++;
 957                         /*
 958                          * other vhosts can share the listen port, they
 959                          * point to the same wsi.  So zap those too.
 960                          */
 961                         vh1 = context->vhost_list;
 962                         while (vh1) {
 963                                 if (vh1->lserv_wsi == wsi)
 964                                         vh1->lserv_wsi = NULL;
 965                                 vh1 = vh1->vhost_next;
 966                         }
 967                 }
 968                 vh = vh->vhost_next;
 969         }
 970
 971         context->deprecated = 1;
 972         context->deprecation_cb = cb;
 973 }
 974
 975 LWS_VISIBLE LWS_EXTERN int
 976 lws_context_is_deprecated(struct lws_context *context)
 977 {
 978         return context->deprecated;
 979 }
 980
 981 LWS_VISIBLE void
 982 lws_context_destroy2(struct lws_context *context);
 983
 984 LWS_VISIBLE void
 985 lws_context_destroy(struct lws_context *context)
 986 {
 987         const struct lws_protocols *protocol = NULL;
 988         struct lws_context_per_thread *pt;
 989         struct lws_vhost *vh = NULL;
 990         struct lws wsi;
 991         int n, m;
 992
 993         if (!context) {
 994                 lwsl_notice("%s: ctx %p\n", __func__, context);
 995                 return;
 996         }
 997         if (context->being_destroyed1) {
 998                 lwsl_notice("%s: ctx %p: already being destroyed\n", __func__, context);
 999                 return;
1000         }
1001
1002         lwsl_notice("%s: ctx %p\n", __func__, context);
1003
1004         m = context->count_threads;
1005         context->being_destroyed = 1;
1006         context->being_destroyed1 = 1;
1007
1008         memset(&wsi, 0, sizeof(wsi));
1009         wsi.context = context;
1010
1011 #ifdef LWS_LATENCY
1012         if (context->worst_latency_info[0])
1013                 lwsl_notice("Worst latency: %s\n", context->worst_latency_info);
1014 #endif
1015
1016         while (m--) {
1017                 pt = &context->pt[m];
1018
1019                 for (n = 0; (unsigned int)n < context->pt[m].fds_count; n++) {
1020                         struct lws *wsi = wsi_from_fd(context, pt->fds[n].fd);
1021                         if (!wsi)
1022                                 continue;
1023
1024                         lws_close_free_wsi(wsi,
1025                                 LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY
1026                                 /* no protocol close */);
1027                         n--;
1028                 }
1029                 lws_pt_mutex_destroy(pt);
1030         }
1031
1032         /*
1033          * give all extensions a chance to clean up any per-context
1034          * allocations they might have made
1035          */
1036
1037         n = lws_ext_cb_all_exts(context, NULL,
1038                                 LWS_EXT_CB_SERVER_CONTEXT_DESTRUCT, NULL, 0);
1039
1040         n = lws_ext_cb_all_exts(context, NULL,
1041                                 LWS_EXT_CB_CLIENT_CONTEXT_DESTRUCT, NULL, 0);
1042
1043         /*
1044          * inform all the protocols that they are done and will have no more
1045          * callbacks.
1046          *
1047          * We can't free things until after the event loop shuts down.
1048          */
1049         if (context->protocol_init_done)
1050                 vh = context->vhost_list;
1051         while (vh) {
1052                 wsi.vhost = vh;
1053                 protocol = vh->protocols;
1054                 if (protocol) {
1055                         n = 0;
1056                         while (n < vh->count_protocols) {
1057                                 wsi.protocol = protocol;
1058                                 protocol->callback(&wsi, LWS_CALLBACK_PROTOCOL_DESTROY,
1059                                                    NULL, NULL, 0);
1060                                 protocol++;
1061                                 n++;
1062                         }
1063                 }
1064
1065                 vh = vh->vhost_next;
1066         }
1067
1068         for (n = 0; n < context->count_threads; n++) {
1069                 pt = &context->pt[n];
1070
1071                 lws_libev_destroyloop(context, n);
1072                 lws_libuv_destroyloop(context, n);
1073                 lws_libevent_destroyloop(context, n);
1074
1075                 lws_free_set_NULL(context->pt[n].serv_buf);
1076                 if (pt->ah_pool)
1077                         lws_free(pt->ah_pool);
1078                 if (pt->http_header_data)
1079                         lws_free(pt->http_header_data);
1080         }
1081         lws_plat_context_early_destroy(context);
1082
1083         if (context->pt[0].fds)
1084                 lws_free_set_NULL(context->pt[0].fds);
1085
1086         if (!LWS_LIBUV_ENABLED(context))
1087                 lws_context_destroy2(context);
1088 }
1089
1090 /*
1091  * call the second one after the event loop has been shut down cleanly
1092  */
1093
1094 LWS_VISIBLE void
1095 lws_context_destroy2(struct lws_context *context)
1096 {
1097         const struct lws_protocols *protocol = NULL;
1098         struct lws_vhost *vh = NULL, *vh1;
1099         int n;
1100
1101         lwsl_notice("%s: ctx %p\n", __func__, context);
1102
1103         /*
1104          * free all the per-vhost allocations
1105          */
1106
1107         vh = context->vhost_list;
1108         while (vh) {
1109                 protocol = vh->protocols;
1110                 if (protocol) {
1111                         n = 0;
1112                         while (n < vh->count_protocols) {
1113                                 if (vh->protocol_vh_privs &&
1114                                     vh->protocol_vh_privs[n]) {
1115                                         // lwsl_notice("   %s: freeing per-vhost protocol data %p\n", __func__, vh->protocol_vh_privs[n]);
1116                                         lws_free(vh->protocol_vh_privs[n]);
1117                                         vh->protocol_vh_privs[n] = NULL;
1118                                 }
1119                                 protocol++;
1120                                 n++;
1121                         }
1122                 }
1123                 if (vh->protocol_vh_privs)
1124                         lws_free(vh->protocol_vh_privs);
1125                 lws_ssl_SSL_CTX_destroy(vh);
1126                 lws_free(vh->same_vh_protocol_list);
1127 #ifdef LWS_WITH_PLUGINS
1128                 if (context->plugin_list)
1129                         lws_free((void *)vh->protocols);
1130 #else
1131                 if (vh->options & LWS_SERVER_OPTION_EXPLICIT_VHOSTS)
1132                         lws_free((void *)vh->protocols);
1133 #endif
1134 #ifdef LWS_WITH_PLUGINS
1135 #ifndef LWS_NO_EXTENSIONS
1136                 if (context->plugin_extension_count)
1137                         lws_free((void *)vh->extensions);
1138 #endif
1139 #endif
1140 #ifdef LWS_WITH_ACCESS_LOG
1141                 if (vh->log_fd != (int)LWS_INVALID_FILE)
1142                         close(vh->log_fd);
1143 #endif
1144
1145                 vh1 = vh->vhost_next;
1146                 lws_free(vh);
1147                 vh = vh1;
1148         }
1149
1150         lws_stats_log_dump(context);
1151
1152         lws_ssl_context_destroy(context);
1153         lws_plat_context_late_destroy(context);
1154
1155         if (context->external_baggage_free_on_destroy)
1156                 free(context->external_baggage_free_on_destroy);
1157
1158         lws_free(context);
1159 }