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 int
 126 lws_protocol_init(struct lws_context *context)
 127 {
 128         struct lws_vhost *vh = context->vhost_list;
 129         const struct lws_protocol_vhost_options *pvo, *pvo1;
 130         struct lws wsi;
 131         int n;
 132
 133         memset(&wsi, 0, sizeof(wsi));
 134         wsi.context = context;
 135
 136         lwsl_notice("%s\n", __func__);
 137
 138         while (vh) {
 139                 wsi.vhost = vh;
 140
 141                 /* initialize supported protocols on this vhost */
 142
 143                 for (n = 0; n < vh->count_protocols; n++) {
 144                         wsi.protocol = &vh->protocols[n];
 145
 146                         pvo = lws_vhost_protocol_options(vh,
 147                                                          vh->protocols[n].name);
 148                         if (pvo) {
 149                                 /*
 150                                  * linked list of options specific to
 151                                  * vh + protocol
 152                                  */
 153                                 pvo1 = pvo;
 154                                 pvo = pvo1->options;
 155
 156                                 while (pvo) {
 157                                         lwsl_notice("    vh %s prot %s opt %s\n",
 158                                                         vh->name,
 159                                                         vh->protocols[n].name,
 160                                                         pvo->name);
 161
 162                                         if (!strcmp(pvo->name, "default")) {
 163                                                 lwsl_notice("Setting default "
 164                                                    "protocol for vh %s to %s\n",
 165                                                    vh->name,
 166                                                    vh->protocols[n].name);
 167                                                 vh->default_protocol_index = n;
 168                                         }
 169                                         pvo = pvo->next;
 170                                 }
 171
 172                                 pvo = pvo1->options;
 173                         }
 174
 175                         /*
 176                          * inform all the protocols that they are doing their one-time
 177                          * initialization if they want to.
 178                          *
 179                          * NOTE the wsi is all zeros except for the context, vh and
 180                          * protocol ptrs so lws_get_context(wsi) etc can work
 181                          */
 182                         if (vh->protocols[n].callback(&wsi,
 183                                 LWS_CALLBACK_PROTOCOL_INIT, NULL,
 184                                 (void *)pvo, 0))
 185                                 return 1;
 186                 }
 187
 188                 vh = vh->vhost_next;
 189         }
 190
 191         context->protocol_init_done = 1;
 192         lws_finalize_startup(context);
 193
 194         return 0;
 195 }
 196
 197 static int
 198 callback_http_dummy(struct lws *wsi, enum lws_callback_reasons reason,
 199                     void *user, void *in, size_t len)
 200 {
 201 #ifdef LWS_WITH_CGI
 202         struct lws_cgi_args *args;
 203         char buf[128];
 204         int n;
 205 #endif
 206
 207         switch (reason) {
 208         case LWS_CALLBACK_HTTP:
 209 #ifndef LWS_NO_SERVER
 210                 if (lws_return_http_status(wsi, HTTP_STATUS_NOT_FOUND, NULL))
 211                         return -1;
 212
 213                 if (lws_http_transaction_completed(wsi))
 214 #endif
 215                         return -1;
 216                 break;
 217
 218         case LWS_CALLBACK_HTTP_WRITEABLE:
 219 #ifdef LWS_WITH_CGI
 220                 if (wsi->reason_bf & 1) {
 221                         if (lws_cgi_write_split_stdout_headers(wsi) < 0)
 222                                 return -1;
 223
 224                         wsi->reason_bf &= ~1;
 225                         break;
 226                 }
 227 #endif
 228
 229                 break;
 230
 231 #ifdef LWS_WITH_CGI
 232         /* CGI IO events (POLLIN/OUT) appear here, our default policy is:
 233          *
 234          *  - POST data goes on subprocess stdin
 235          *  - subprocess stdout goes on http via writeable callback
 236          *  - subprocess stderr goes to the logs
 237          */
 238         case LWS_CALLBACK_CGI:
 239                 args = (struct lws_cgi_args *)in;
 240                 switch (args->ch) { /* which of stdin/out/err ? */
 241                 case LWS_STDIN:
 242                         /* TBD stdin rx flow control */
 243                         break;
 244                 case LWS_STDOUT:
 245                         wsi->reason_bf |= 1;
 246                         /* when writing to MASTER would not block */
 247                         lws_callback_on_writable(wsi);
 248                         break;
 249                 case LWS_STDERR:
 250                         n = read(lws_get_socket_fd(args->stdwsi[LWS_STDERR]),
 251                                                    buf, sizeof(buf) - 1);
 252                         if (n > 0) {
 253                                 if (buf[n - 1] != '\n')
 254                                         buf[n++] = '\n';
 255                                 buf[n] = '\0';
 256                                 lwsl_notice("CGI-stderr: %s\n", buf);
 257                         }
 258                         break;
 259                 }
 260                 break;
 261
 262         case LWS_CALLBACK_CGI_TERMINATED:
 263                 return -1;
 264
 265         case LWS_CALLBACK_CGI_STDIN_DATA:  /* POST body for stdin */
 266                 args = (struct lws_cgi_args *)in;
 267                 args->data[args->len] = '\0';
 268                 n = write(lws_get_socket_fd(args->stdwsi[LWS_STDIN]),
 269                           args->data, args->len);
 270                 if (n < args->len)
 271                         lwsl_notice("LWS_CALLBACK_CGI_STDIN_DATA: "
 272                                     "sent %d only %d went", n, args->len);
 273                 return n;
 274 #endif
 275         default:
 276                 break;
 277         }
 278
 279         return 0;
 280 }
 281
 282 /* list of supported protocols and callbacks */
 283
 284 static const struct lws_protocols protocols_dummy[] = {
 285         /* first protocol must always be HTTP handler */
 286
 287         {
 288                 "http-only",            /* name */
 289                 callback_http_dummy,            /* callback */
 290                 0,      /* per_session_data_size */
 291                 0,                      /* max frame size / rx buffer */
 292         },
 293         /*
 294          * the other protocols are provided by lws plugins
 295          */
 296         { NULL, NULL, 0, 0 } /* terminator */
 297 };
 298
 299 LWS_VISIBLE struct lws_vhost *
 300 lws_create_vhost(struct lws_context *context,
 301                  struct lws_context_creation_info *info)
 302 {
 303         struct lws_vhost *vh = lws_zalloc(sizeof(*vh)),
 304                          **vh1 = &context->vhost_list;
 305         const struct lws_http_mount *mounts;
 306         const struct lws_protocol_vhost_options *pvo;
 307 #ifdef LWS_WITH_PLUGINS
 308         struct lws_plugin *plugin = context->plugin_list;
 309         struct lws_protocols *lwsp;
 310         int m, f = !info->pvo;
 311 #endif
 312         char *p;
 313         int n;
 314
 315         if (!vh)
 316                 return NULL;
 317
 318         if (!info->protocols)
 319                 info->protocols = &protocols_dummy[0];
 320
 321         vh->context = context;
 322         if (!info->vhost_name)
 323                 vh->name = "default";
 324         else
 325                 vh->name = info->vhost_name;
 326
 327         vh->iface = info->iface;
 328         for (vh->count_protocols = 0;
 329              info->protocols[vh->count_protocols].callback;
 330              vh->count_protocols++)
 331                 ;
 332
 333         vh->options = info->options;
 334         vh->pvo = info->pvo;
 335         vh->keepalive_timeout = info->keepalive_timeout;
 336
 337 #ifdef LWS_WITH_PLUGINS
 338         if (plugin) {
 339                 /*
 340                  * give the vhost a unified list of protocols including the
 341                  * ones that came from plugins
 342                  */
 343                 lwsp = lws_zalloc(sizeof(struct lws_protocols) *
 344                                            (vh->count_protocols +
 345                                            context->plugin_protocol_count + 1));
 346                 if (!lwsp)
 347                         return NULL;
 348
 349                 m = vh->count_protocols;
 350                 memcpy(lwsp, info->protocols,
 351                        sizeof(struct lws_protocols) * m);
 352
 353                 /* for compatibility, all protocols enabled on vhost if only
 354                  * the default vhost exists.  Otherwise only vhosts who ask
 355                  * for a protocol get it enabled.
 356                  */
 357
 358                 if (info->options & LWS_SERVER_OPTION_EXPLICIT_VHOSTS)
 359                         f = 0;
 360
 361                 while (plugin) {
 362                         for (n = 0; n < plugin->caps.count_protocols; n++) {
 363                                 /*
 364                                  * for compatibility's sake, no pvo implies
 365                                  * allow all protocols
 366                                  */
 367                                 if (f || lws_vhost_protocol_options(vh,
 368                                     plugin->caps.protocols[n].name)) {
 369                                         memcpy(&lwsp[m],
 370                                                &plugin->caps.protocols[n],
 371                                                sizeof(struct lws_protocols));
 372                                         m++;
 373                                         vh->count_protocols++;
 374                                 }
 375                         }
 376                         plugin = plugin->list;
 377                 }
 378                 vh->protocols = lwsp;
 379         } else
 380 #endif
 381                 vh->protocols = info->protocols;
 382
 383         vh->same_vh_protocol_list = (struct lws **)
 384                         lws_zalloc(sizeof(struct lws *) * vh->count_protocols);
 385
 386         vh->mount_list = info->mounts;
 387
 388 #ifdef LWS_USE_UNIX_SOCK
 389         if (LWS_UNIX_SOCK_ENABLED(context)) {
 390                 lwsl_notice("Creating Vhost '%s' path \"%s\", %d protocols\n",
 391                                 vh->name, info->iface, vh->count_protocols);
 392         } else
 393 #endif
 394         lwsl_notice("Creating Vhost '%s' port %d, %d protocols, IPv6 %s\n",
 395                         vh->name, info->port, vh->count_protocols, LWS_IPV6_ENABLED(vh) ? "on" : "off");
 396
 397         mounts = info->mounts;
 398         while (mounts) {
 399                 lwsl_notice("   mounting %s%s to %s\n",
 400                                 mount_protocols[mounts->origin_protocol],
 401                                 mounts->origin, mounts->mountpoint);
 402
 403                 /* convert interpreter protocol names to pointers */
 404                 pvo = mounts->interpret;
 405                 while (pvo) {
 406                         for (n = 0; n < vh->count_protocols; n++)
 407                                 if (!strcmp(pvo->value, vh->protocols[n].name)) {
 408                                         ((struct lws_protocol_vhost_options *)pvo)->value =
 409                                                         (const char *)(long)n;
 410                                         break;
 411                                 }
 412                         if (n == vh->count_protocols)
 413                                 lwsl_err("ignoring unknown interpret protocol %s\n", pvo->value);
 414                         pvo = pvo->next;
 415                 }
 416
 417                 mounts = mounts->mount_next;
 418         }
 419
 420 #ifndef LWS_NO_EXTENSIONS
 421 #ifdef LWS_WITH_PLUGINS
 422         if (context->plugin_extension_count) {
 423
 424                 m = 0;
 425                 while (info->extensions && info->extensions[m].callback)
 426                         m++;
 427
 428                 /*
 429                  * give the vhost a unified list of extensions including the
 430                  * ones that came from plugins
 431                  */
 432                 vh->extensions = lws_zalloc(sizeof(struct lws_extension) *
 433                                            (m +
 434                                            context->plugin_extension_count + 1));
 435                 if (!vh->extensions)
 436                         return NULL;
 437
 438                 memcpy((struct lws_extension *)vh->extensions, info->extensions,
 439                        sizeof(struct lws_extension) * m);
 440                 plugin = context->plugin_list;
 441                 while (plugin) {
 442                         memcpy((struct lws_extension *)&vh->extensions[m],
 443                                 plugin->caps.extensions,
 444                                sizeof(struct lws_extension) *
 445                                plugin->caps.count_extensions);
 446                         m += plugin->caps.count_extensions;
 447                         plugin = plugin->list;
 448                 }
 449         } else
 450 #endif
 451                 vh->extensions = info->extensions;
 452 #endif
 453
 454         vh->listen_port = info->port;
 455         vh->http_proxy_port = 0;
 456         vh->http_proxy_address[0] = '\0';
 457
 458         /* either use proxy from info, or try get it from env var */
 459
 460         if (info->http_proxy_address) {
 461                 /* override for backwards compatibility */
 462                 if (info->http_proxy_port)
 463                         vh->http_proxy_port = info->http_proxy_port;
 464                 lws_set_proxy(vh, info->http_proxy_address);
 465         } else {
 466 #ifdef LWS_HAVE_GETENV
 467                 p = getenv("http_proxy");
 468                 if (p)
 469                         lws_set_proxy(vh, p);
 470 #endif
 471         }
 472
 473         vh->ka_time = info->ka_time;
 474         vh->ka_interval = info->ka_interval;
 475         vh->ka_probes = info->ka_probes;
 476
 477         if (vh->options & LWS_SERVER_OPTION_STS)
 478                 lwsl_notice("   STS enabled\n");
 479
 480 #ifdef LWS_WITH_ACCESS_LOG
 481         if (info->log_filepath) {
 482                 vh->log_fd = open(info->log_filepath, O_CREAT | O_APPEND | O_RDWR, 0600);
 483                 if (vh->log_fd == (int)LWS_INVALID_FILE) {
 484                         lwsl_err("unable to open log filepath %s\n",
 485                                  info->log_filepath);
 486                         goto bail;
 487                 }
 488 #ifndef WIN32
 489                 if (context->uid != -1)
 490                         if (chown(info->log_filepath, context->uid,
 491                                   context->gid) == -1)
 492                                 lwsl_err("unable to chown log file %s\n",
 493                                                 info->log_filepath);
 494 #endif
 495         } else
 496                 vh->log_fd = (int)LWS_INVALID_FILE;
 497 #endif
 498
 499         if (lws_context_init_server_ssl(info, vh))
 500                 goto bail;
 501
 502         if (lws_context_init_client_ssl(info, vh))
 503                 goto bail;
 504
 505         if (lws_context_init_server(info, vh))
 506                 goto bail;
 507
 508         while (1) {
 509                 if (!(*vh1)) {
 510                         *vh1 = vh;
 511                         break;
 512                 }
 513                 vh1 = &(*vh1)->vhost_next;
 514         };
 515
 516         return vh;
 517
 518 bail:
 519         lws_free(vh);
 520
 521         return NULL;
 522 }
 523
 524 LWS_VISIBLE int
 525 lws_init_vhost_client_ssl(const struct lws_context_creation_info *info,
 526                           struct lws_vhost *vhost)
 527 {
 528         struct lws_context_creation_info i;
 529
 530         memcpy(&i, info, sizeof(i));
 531         i.port = CONTEXT_PORT_NO_LISTEN;
 532
 533         return lws_context_init_client_ssl(&i, vhost);
 534 }
 535
 536 LWS_VISIBLE struct lws_context *
 537 lws_create_context(struct lws_context_creation_info *info)
 538 {
 539         struct lws_context *context = NULL;
 540         struct lws wsi;
 541 #ifndef LWS_NO_DAEMONIZE
 542         int pid_daemon = get_daemonize_pid();
 543 #endif
 544         int n, m;
 545 #if defined(__ANDROID__)
 546         struct rlimit rt;
 547 #endif
 548
 549         lwsl_notice("Initial logging level %d\n", log_level);
 550         lwsl_notice("Libwebsockets version: %s\n", library_version);
 551 #if LWS_POSIX
 552 #ifdef LWS_USE_IPV6
 553         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_DISABLE_IPV6))
 554                 lwsl_notice("IPV6 compiled in and enabled\n");
 555         else
 556                 lwsl_notice("IPV6 compiled in but disabled\n");
 557 #else
 558         lwsl_notice("IPV6 not compiled in\n");
 559 #endif
 560         lws_feature_status_libev(info);
 561         lws_feature_status_libuv(info);
 562 #endif
 563         lwsl_info(" LWS_DEF_HEADER_LEN    : %u\n", LWS_DEF_HEADER_LEN);
 564         lwsl_info(" LWS_MAX_PROTOCOLS     : %u\n", LWS_MAX_PROTOCOLS);
 565         lwsl_info(" LWS_MAX_SMP           : %u\n", LWS_MAX_SMP);
 566         lwsl_info(" SPEC_LATEST_SUPPORTED : %u\n", SPEC_LATEST_SUPPORTED);
 567         lwsl_info(" sizeof (*info)        : %u\n", sizeof(*info));
 568 #if LWS_POSIX
 569         lwsl_info(" SYSTEM_RANDOM_FILEPATH: '%s'\n", SYSTEM_RANDOM_FILEPATH);
 570 #endif
 571         if (lws_plat_context_early_init())
 572                 return NULL;
 573
 574         context = lws_zalloc(sizeof(struct lws_context));
 575         if (!context) {
 576                 lwsl_err("No memory for websocket context\n");
 577                 return NULL;
 578         }
 579
 580         if (info->pt_serv_buf_size)
 581                 context->pt_serv_buf_size = info->pt_serv_buf_size;
 582         else
 583                 context->pt_serv_buf_size = 4096;
 584
 585         context->time_up = time(NULL);
 586 #ifndef LWS_NO_DAEMONIZE
 587         if (pid_daemon) {
 588                 context->started_with_parent = pid_daemon;
 589                 lwsl_notice(" Started with daemon pid %d\n", pid_daemon);
 590         }
 591 #endif
 592 #if defined(__ANDROID__)
 593                 n = getrlimit ( RLIMIT_NOFILE,&rt);
 594                 if (-1 == n) {
 595                         lwsl_err("Get RLIMIT_NOFILE failed!\n");
 596                         return NULL;
 597                 }
 598                 context->max_fds = rt.rlim_cur;
 599 #else
 600                 context->max_fds = getdtablesize();
 601 #endif
 602
 603         if (info->count_threads)
 604                 context->count_threads = info->count_threads;
 605         else
 606                 context->count_threads = 1;
 607
 608         if (context->count_threads > LWS_MAX_SMP)
 609                 context->count_threads = LWS_MAX_SMP;
 610
 611         context->token_limits = info->token_limits;
 612
 613         context->options = info->options;
 614
 615         if (info->timeout_secs)
 616                 context->timeout_secs = info->timeout_secs;
 617         else
 618                 context->timeout_secs = AWAITING_TIMEOUT;
 619
 620         context->ws_ping_pong_interval = info->ws_ping_pong_interval;
 621
 622         lwsl_info(" default timeout (secs): %u\n", context->timeout_secs);
 623
 624         if (info->max_http_header_data)
 625                 context->max_http_header_data = info->max_http_header_data;
 626         else
 627                 if (info->max_http_header_data2)
 628                         context->max_http_header_data =
 629                                         info->max_http_header_data2;
 630                 else
 631                         context->max_http_header_data = LWS_DEF_HEADER_LEN;
 632         if (info->max_http_header_pool)
 633                 context->max_http_header_pool = info->max_http_header_pool;
 634         else
 635                 context->max_http_header_pool = LWS_DEF_HEADER_POOL;
 636
 637         /*
 638          * Allocate the per-thread storage for scratchpad buffers,
 639          * and header data pool
 640          */
 641         for (n = 0; n < context->count_threads; n++) {
 642                 context->pt[n].serv_buf = lws_zalloc(context->pt_serv_buf_size);
 643                 if (!context->pt[n].serv_buf) {
 644                         lwsl_err("OOM\n");
 645                         return NULL;
 646                 }
 647
 648                 context->pt[n].context = context;
 649                 context->pt[n].tid = n;
 650                 context->pt[n].http_header_data = lws_malloc(context->max_http_header_data *
 651                                                        context->max_http_header_pool);
 652                 if (!context->pt[n].http_header_data)
 653                         goto bail;
 654
 655                 context->pt[n].ah_pool = lws_zalloc(sizeof(struct allocated_headers) *
 656                                               context->max_http_header_pool);
 657                 for (m = 0; m < context->max_http_header_pool; m++)
 658                         context->pt[n].ah_pool[m].data =
 659                                 (char *)context->pt[n].http_header_data +
 660                                 (m * context->max_http_header_data);
 661                 if (!context->pt[n].ah_pool)
 662                         goto bail;
 663
 664                 lws_pt_mutex_init(&context->pt[n]);
 665         }
 666
 667         if (info->fd_limit_per_thread)
 668                 context->fd_limit_per_thread = info->fd_limit_per_thread;
 669         else
 670                 context->fd_limit_per_thread = context->max_fds /
 671                                                context->count_threads;
 672
 673         lwsl_notice(" Threads: %d each %d fds\n", context->count_threads,
 674                     context->fd_limit_per_thread);
 675
 676         memset(&wsi, 0, sizeof(wsi));
 677         wsi.context = context;
 678
 679         if (!info->ka_interval && info->ka_time > 0) {
 680                 lwsl_err("info->ka_interval can't be 0 if ka_time used\n");
 681                 return NULL;
 682         }
 683
 684 #ifdef LWS_USE_LIBEV
 685         /* (Issue #264) In order to *avoid breaking backwards compatibility*, we
 686          * enable libev mediated SIGINT handling with a default handler of
 687          * lws_sigint_cb. The handler can be overridden or disabled
 688          * by invoking lws_sigint_cfg after creating the context, but
 689          * before invoking lws_initloop:
 690          */
 691         context->use_ev_sigint = 1;
 692         context->lws_ev_sigint_cb = &lws_ev_sigint_cb;
 693 #endif /* LWS_USE_LIBEV */
 694 #ifdef LWS_USE_LIBUV
 695         /* (Issue #264) In order to *avoid breaking backwards compatibility*, we
 696          * enable libev mediated SIGINT handling with a default handler of
 697          * lws_sigint_cb. The handler can be overridden or disabled
 698          * by invoking lws_sigint_cfg after creating the context, but
 699          * before invoking lws_initloop:
 700          */
 701         context->use_ev_sigint = 1;
 702         context->lws_uv_sigint_cb = &lws_uv_sigint_cb;
 703 #endif
 704
 705         lwsl_info(" mem: context:         %5u bytes (%d ctx + (%d thr x %d))\n",
 706                   sizeof(struct lws_context) +
 707                   (context->count_threads * context->pt_serv_buf_size),
 708                   sizeof(struct lws_context),
 709                   context->count_threads,
 710                   context->pt_serv_buf_size);
 711
 712         lwsl_info(" mem: http hdr rsvd:   %5u bytes (%u thr x (%u + %u) x %u))\n",
 713                     (context->max_http_header_data +
 714                      sizeof(struct allocated_headers)) *
 715                     context->max_http_header_pool * context->count_threads,
 716                     context->count_threads,
 717                     context->max_http_header_data,
 718                     sizeof(struct allocated_headers),
 719                     context->max_http_header_pool);
 720         n = sizeof(struct lws_pollfd) * context->count_threads *
 721             context->fd_limit_per_thread;
 722         context->pt[0].fds = lws_zalloc(n);
 723         if (context->pt[0].fds == NULL) {
 724                 lwsl_err("OOM allocating %d fds\n", context->max_fds);
 725                 goto bail;
 726         }
 727         lwsl_info(" mem: pollfd map:      %5u\n", n);
 728
 729         if (info->server_string) {
 730                 context->server_string = info->server_string;
 731                 context->server_string_len = (short)
 732                                 strlen(context->server_string);
 733         } else {
 734                 context->server_string = "libwebsockets";
 735                 context->server_string_len = 13;
 736         }
 737
 738 #if LWS_MAX_SMP > 1
 739         /* each thread serves his own chunk of fds */
 740         for (n = 1; n < (int)info->count_threads; n++)
 741                 context->pt[n].fds = context->pt[n - 1].fds +
 742                                      context->fd_limit_per_thread;
 743 #endif
 744
 745         if (lws_plat_init(context, info))
 746                 goto bail;
 747
 748         lws_context_init_ssl_library(info);
 749
 750         context->user_space = info->user;
 751
 752         /*
 753          * if he's not saying he'll make his own vhosts later then act
 754          * compatibly and make a default vhost using the data in the info
 755          */
 756         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
 757                 if (!lws_create_vhost(context, info)) {
 758                         lwsl_err("Failed to create default vhost\n");
 759                         return NULL;
 760                 }
 761
 762         lws_context_init_extensions(info, context);
 763
 764         lwsl_notice(" mem: per-conn:        %5u bytes + protocol rx buf\n",
 765                     sizeof(struct lws));
 766
 767         strcpy(context->canonical_hostname, "unknown");
 768         lws_server_get_canonical_hostname(context, info);
 769
 770         context->uid = info->uid;
 771         context->gid = info->gid;
 772
 773         /*
 774          * drop any root privs for this process
 775          * to listen on port < 1023 we would have needed root, but now we are
 776          * listening, we don't want the power for anything else
 777          */
 778         if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
 779                 lws_plat_drop_app_privileges(info);
 780
 781         /*
 782          * give all extensions a chance to create any per-context
 783          * allocations they need
 784          */
 785         if (info->port != CONTEXT_PORT_NO_LISTEN) {
 786                 if (lws_ext_cb_all_exts(context, NULL,
 787                         LWS_EXT_CB_SERVER_CONTEXT_CONSTRUCT, NULL, 0) < 0)
 788                         goto bail;
 789         } else
 790                 if (lws_ext_cb_all_exts(context, NULL,
 791                         LWS_EXT_CB_CLIENT_CONTEXT_CONSTRUCT, NULL, 0) < 0)
 792                         goto bail;
 793
 794         return context;
 795
 796 bail:
 797         lws_context_destroy(context);
 798         return NULL;
 799 }
 800
 801 LWS_VISIBLE void
 802 lws_context_destroy(struct lws_context *context)
 803 {
 804         const struct lws_protocols *protocol = NULL;
 805         struct lws_context_per_thread *pt;
 806         struct lws_vhost *vh = NULL, *vh1;
 807         struct lws wsi;
 808         int n, m;
 809
 810         lwsl_notice("%s\n", __func__);
 811
 812         if (!context)
 813                 return;
 814
 815         m = context->count_threads;
 816         context->being_destroyed = 1;
 817
 818         memset(&wsi, 0, sizeof(wsi));
 819         wsi.context = context;
 820
 821 #ifdef LWS_LATENCY
 822         if (context->worst_latency_info[0])
 823                 lwsl_notice("Worst latency: %s\n", context->worst_latency_info);
 824 #endif
 825
 826         while (m--) {
 827                 pt = &context->pt[m];
 828
 829                 for (n = 0; (unsigned int)n < context->pt[m].fds_count; n++) {
 830                         struct lws *wsi = wsi_from_fd(context, pt->fds[n].fd);
 831                         if (!wsi)
 832                                 continue;
 833
 834                         lws_close_free_wsi(wsi,
 835                                 LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY
 836                                 /* no protocol close */);
 837                         n--;
 838                 }
 839                 lws_pt_mutex_destroy(pt);
 840         }
 841         /*
 842          * give all extensions a chance to clean up any per-context
 843          * allocations they might have made
 844          */
 845
 846         n = lws_ext_cb_all_exts(context, NULL,
 847                                 LWS_EXT_CB_SERVER_CONTEXT_DESTRUCT, NULL, 0);
 848
 849         n = lws_ext_cb_all_exts(context, NULL,
 850                                 LWS_EXT_CB_CLIENT_CONTEXT_DESTRUCT, NULL, 0);
 851
 852         /*
 853          * inform all the protocols that they are done and will have no more
 854          * callbacks.
 855          *
 856          * We can't free things until after the event loop shuts down.
 857          */
 858         if (context->protocol_init_done)
 859                 vh = context->vhost_list;
 860         while (vh) {
 861                 wsi.vhost = vh;
 862                 protocol = vh->protocols;
 863                 if (protocol) {
 864                         n = 0;
 865                         while (n < vh->count_protocols) {
 866                                 wsi.protocol = protocol;
 867                                 protocol->callback(&wsi, LWS_CALLBACK_PROTOCOL_DESTROY,
 868                                                    NULL, NULL, 0);
 869                                 protocol++;
 870                                 n++;
 871                         }
 872                 }
 873
 874                 vh = vh->vhost_next;
 875         }
 876
 877         for (n = 0; n < context->count_threads; n++) {
 878                 pt = &context->pt[n];
 879
 880                 lws_libev_destroyloop(context, n);
 881                 lws_libuv_destroyloop(context, n);
 882
 883                 lws_free_set_NULL(context->pt[n].serv_buf);
 884                 if (pt->ah_pool)
 885                         lws_free(pt->ah_pool);
 886                 if (pt->http_header_data)
 887                         lws_free(pt->http_header_data);
 888         }
 889         lws_plat_context_early_destroy(context);
 890         lws_ssl_context_destroy(context);
 891
 892         if (context->pt[0].fds)
 893                 lws_free_set_NULL(context->pt[0].fds);
 894
 895         /* free all the vhost allocations */
 896
 897         vh = context->vhost_list;
 898         while (vh) {
 899                 protocol = vh->protocols;
 900                 if (protocol) {
 901                         n = 0;
 902                         while (n < vh->count_protocols) {
 903                                 if (vh->protocol_vh_privs &&
 904                                     vh->protocol_vh_privs[n]) {
 905                                         lws_free(vh->protocol_vh_privs[n]);
 906                                         vh->protocol_vh_privs[n] = NULL;
 907                                 }
 908                                 protocol++;
 909                                 n++;
 910                         }
 911                 }
 912                 if (vh->protocol_vh_privs)
 913                         lws_free(vh->protocol_vh_privs);
 914                 lws_ssl_SSL_CTX_destroy(vh);
 915                 lws_free(vh->same_vh_protocol_list);
 916 #ifdef LWS_WITH_PLUGINS
 917                 if (context->plugin_list)
 918                         lws_free((void *)vh->protocols);
 919 #ifndef LWS_NO_EXTENSIONS
 920                 if (context->plugin_extension_count)
 921                         lws_free((void *)vh->extensions);
 922 #endif
 923 #endif
 924 #ifdef LWS_WITH_ACCESS_LOG
 925                 if (vh->log_fd != (int)LWS_INVALID_FILE)
 926                         close(vh->log_fd);
 927 #endif
 928
 929                 vh1 = vh->vhost_next;
 930                 lws_free(vh);
 931                 vh = vh1;
 932         }
 933
 934         lws_plat_context_late_destroy(context);
 935
 936         lws_free(context);
 937 }