test-server/test-server-http.c

   1 /*
   2  * libwebsockets-test-server - libwebsockets test implementation
   3  *
   4  * Copyright (C) 2010-2016 Andy Green <andy@warmcat.com>
   5  *
   6  * This file is made available under the Creative Commons CC0 1.0
   7  * Universal Public Domain Dedication.
   8  *
   9  * The person who associated a work with this deed has dedicated
  10  * the work to the public domain by waiving all of his or her rights
  11  * to the work worldwide under copyright law, including all related
  12  * and neighboring rights, to the extent allowed by law. You can copy,
  13  * modify, distribute and perform the work, even for commercial purposes,
  14  * all without asking permission.
  15  *
  16  * The test apps are intended to be adapted for use in your code, which
  17  * may be proprietary.  So unlike the library itself, they are licensed
  18  * Public Domain.
  19  */
  20 #include "test-server.h"
  21
  22 /*
  23  * This demo server shows how to use libwebsockets for one or more
  24  * websocket protocols in the same server
  25  *
  26  * It defines the following websocket protocols:
  27  *
  28  *  dumb-increment-protocol:  once the socket is opened, an incrementing
  29  *                              ascii string is sent down it every 50ms.
  30  *                              If you send "reset\n" on the websocket, then
  31  *                              the incrementing number is reset to 0.
  32  *
  33  *  lws-mirror-protocol: copies any received packet to every connection also
  34  *                              using this protocol, including the sender
  35  */
  36
  37 #if defined(LWS_USE_POLARSSL)
  38 #else
  39 #if defined(LWS_USE_MBEDTLS)
  40 #else
  41 #if defined(LWS_OPENSSL_SUPPORT) && defined(LWS_HAVE_SSL_CTX_set1_param)
  42 /* location of the certificate revocation list */
  43 extern char crl_path[1024];
  44 #endif
  45 #endif
  46 #endif
  47
  48 extern int debug_level;
  49
  50 enum demo_protocols {
  51         /* always first */
  52         PROTOCOL_HTTP = 0,
  53
  54         PROTOCOL_DUMB_INCREMENT,
  55         PROTOCOL_LWS_MIRROR,
  56
  57         /* always last */
  58         DEMO_PROTOCOL_COUNT
  59 };
  60
  61 /*
  62  * We take a strict whitelist approach to stop ../ attacks
  63  */
  64 struct serveable {
  65         const char *urlpath;
  66         const char *mimetype;
  67 };
  68
  69 /*
  70  * this is just an example of parsing handshake headers, you don't need this
  71  * in your code unless you will filter allowing connections by the header
  72  * content
  73  */
  74 void
  75 dump_handshake_info(struct lws *wsi)
  76 {
  77         int n = 0, len;
  78         char buf[256];
  79         const unsigned char *c;
  80
  81         do {
  82                 c = lws_token_to_string(n);
  83                 if (!c) {
  84                         n++;
  85                         continue;
  86                 }
  87
  88                 len = lws_hdr_total_length(wsi, n);
  89                 if (!len || len > sizeof(buf) - 1) {
  90                         n++;
  91                         continue;
  92                 }
  93
  94                 lws_hdr_copy(wsi, buf, sizeof buf, n);
  95                 buf[sizeof(buf) - 1] = '\0';
  96
  97                 fprintf(stderr, "    %s = %s\n", (char *)c, buf);
  98                 n++;
  99         } while (c);
 100 }
 101
 102 const char * get_mimetype(const char *file)
 103 {
 104         int n = strlen(file);
 105
 106         if (n < 5)
 107                 return NULL;
 108
 109         if (!strcmp(&file[n - 4], ".ico"))
 110                 return "image/x-icon";
 111
 112         if (!strcmp(&file[n - 4], ".png"))
 113                 return "image/png";
 114
 115         if (!strcmp(&file[n - 5], ".html"))
 116                 return "text/html";
 117
 118         if (!strcmp(&file[n - 4], ".css"))
 119                 return "text/css";
 120
 121         return NULL;
 122 }
 123
 124 /* this protocol server (always the first one) handles HTTP,
 125  *
 126  * Some misc callbacks that aren't associated with a protocol also turn up only
 127  * here on the first protocol server.
 128  */
 129
 130 int callback_http(struct lws *wsi, enum lws_callback_reasons reason, void *user,
 131                   void *in, size_t len)
 132 {
 133         struct per_session_data__http *pss =
 134                         (struct per_session_data__http *)user;
 135         unsigned char buffer[4096 + LWS_PRE];
 136         unsigned long amount, file_len, sent;
 137         char leaf_path[1024];
 138         const char *mimetype;
 139         char *other_headers;
 140         unsigned char *end;
 141         struct timeval tv;
 142         unsigned char *p;
 143 #ifndef LWS_NO_CLIENT
 144         struct per_session_data__http *pss1;
 145         struct lws *wsi1;
 146 #endif
 147         char buf[256];
 148         char b64[64];
 149         int n, m;
 150 #ifdef EXTERNAL_POLL
 151         struct lws_pollargs *pa = (struct lws_pollargs *)in;
 152 #endif
 153
 154
 155         switch (reason) {
 156         case LWS_CALLBACK_HTTP:
 157
 158                 lwsl_notice("lws_http_serve: %s\n",in);
 159
 160                 if (debug_level & LLL_INFO) {
 161                         dump_handshake_info(wsi);
 162
 163                         /* dump the individual URI Arg parameters */
 164                         n = 0;
 165                         while (lws_hdr_copy_fragment(wsi, buf, sizeof(buf),
 166                                                      WSI_TOKEN_HTTP_URI_ARGS, n) > 0) {
 167                                 lwsl_notice("URI Arg %d: %s\n", ++n, buf);
 168                         }
 169                 }
 170
 171                 {
 172                         char name[100], rip[50];
 173                         lws_get_peer_addresses(wsi, lws_get_socket_fd(wsi), name,
 174                                                sizeof(name), rip, sizeof(rip));
 175                         sprintf(buf, "%s (%s)", name, rip);
 176                         lwsl_notice("HTTP connect from %s\n", buf);
 177                 }
 178
 179                 if (len < 1) {
 180                         lws_return_http_status(wsi,
 181                                                 HTTP_STATUS_BAD_REQUEST, NULL);
 182                         goto try_to_reuse;
 183                 }
 184
 185 #ifndef LWS_NO_CLIENT
 186                 if (!strncmp(in, "/proxytest", 10)) {
 187                         struct lws_client_connect_info i;
 188                         char *rootpath = "/";
 189                         const char *p = (const char *)in;
 190
 191                         if (lws_get_child(wsi))
 192                                 break;
 193
 194                         pss->client_finished = 0;
 195                         memset(&i,0, sizeof(i));
 196                         i.context = lws_get_context(wsi);
 197                         i.address = "git.libwebsockets.org";
 198                         i.port = 80;
 199                         i.ssl_connection = 0;
 200                         if (p[10])
 201                                 i.path = (char *)in + 10;
 202                         else
 203                                 i.path = rootpath;
 204                         i.host = "git.libwebsockets.org";
 205                         i.origin = NULL;
 206                         i.method = "GET";
 207                         i.parent_wsi = wsi;
 208                         i.uri_replace_from = "git.libwebsockets.org/";
 209                         i.uri_replace_to = "/proxytest/";
 210                         if (!lws_client_connect_via_info(&i)) {
 211                                 lwsl_err("proxy connect fail\n");
 212                                 break;
 213                         }
 214
 215
 216
 217                         break;
 218                 }
 219 #endif
 220
 221 #if 1
 222                 /* this example server has no concept of directories */
 223                 if (strchr((const char *)in + 1, '/')) {
 224                         lws_return_http_status(wsi, HTTP_STATUS_NOT_ACCEPTABLE, NULL);
 225                         goto try_to_reuse;
 226                 }
 227 #endif
 228
 229                 /* if a legal POST URL, let it continue and accept data */
 230                 if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI))
 231                         return 0;
 232
 233                 /* check for the "send a big file by hand" example case */
 234
 235                 if (!strcmp((const char *)in, "/leaf.jpg")) {
 236                         if (strlen(resource_path) > sizeof(leaf_path) - 10)
 237                                 return -1;
 238                         sprintf(leaf_path, "%s/leaf.jpg", resource_path);
 239
 240                         /* well, let's demonstrate how to send the hard way */
 241
 242                         p = buffer + LWS_PRE;
 243                         end = p + sizeof(buffer) - LWS_PRE;
 244
 245                         pss->fd = lws_plat_file_open(wsi, leaf_path, &file_len,
 246                                                      LWS_O_RDONLY);
 247
 248                         if (pss->fd == LWS_INVALID_FILE) {
 249                                 lwsl_err("faild to open file %s\n", leaf_path);
 250                                 return -1;
 251                         }
 252
 253                         /*
 254                          * we will send a big jpeg file, but it could be
 255                          * anything.  Set the Content-Type: appropriately
 256                          * so the browser knows what to do with it.
 257                          *
 258                          * Notice we use the APIs to build the header, which
 259                          * will do the right thing for HTTP 1/1.1 and HTTP2
 260                          * depending on what connection it happens to be working
 261                          * on
 262                          */
 263                         if (lws_add_http_header_status(wsi, 200, &p, end))
 264                                 return 1;
 265                         if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_SERVER,
 266                                         (unsigned char *)"libwebsockets",
 267                                         13, &p, end))
 268                                 return 1;
 269                         if (lws_add_http_header_by_token(wsi,
 270                                         WSI_TOKEN_HTTP_CONTENT_TYPE,
 271                                         (unsigned char *)"image/jpeg",
 272                                         10, &p, end))
 273                                 return 1;
 274                         if (lws_add_http_header_content_length(wsi,
 275                                                                file_len, &p,
 276                                                                end))
 277                                 return 1;
 278                         if (lws_finalize_http_header(wsi, &p, end))
 279                                 return 1;
 280
 281                         /*
 282                          * send the http headers...
 283                          * this won't block since it's the first payload sent
 284                          * on the connection since it was established
 285                          * (too small for partial)
 286                          *
 287                          * Notice they are sent using LWS_WRITE_HTTP_HEADERS
 288                          * which also means you can't send body too in one step,
 289                          * this is mandated by changes in HTTP2
 290                          */
 291
 292                         *p = '\0';
 293                         lwsl_info("%s\n", buffer + LWS_PRE);
 294
 295                         n = lws_write(wsi, buffer + LWS_PRE,
 296                                       p - (buffer + LWS_PRE),
 297                                       LWS_WRITE_HTTP_HEADERS);
 298                         if (n < 0) {
 299                                 lws_plat_file_close(wsi, pss->fd);
 300                                 return -1;
 301                         }
 302                         /*
 303                          * book us a LWS_CALLBACK_HTTP_WRITEABLE callback
 304                          */
 305                         lws_callback_on_writable(wsi);
 306                         break;
 307                 }
 308
 309                 /* if not, send a file the easy way */
 310                 if (!strncmp(in, "/cgit-data/", 11)) {
 311                         in = (char *)in + 11;
 312                         strcpy(buf, "/usr/share/cgit");
 313                 } else
 314                         strcpy(buf, resource_path);
 315
 316                 if (strcmp(in, "/")) {
 317                         if (*((const char *)in) != '/')
 318                                 strcat(buf, "/");
 319                         strncat(buf, in, sizeof(buf) - strlen(buf) - 1);
 320                 } else /* default file to serve */
 321                         strcat(buf, "/test.html");
 322                 buf[sizeof(buf) - 1] = '\0';
 323
 324                 /* refuse to serve files we don't understand */
 325                 mimetype = get_mimetype(buf);
 326                 if (!mimetype) {
 327                         lwsl_err("Unknown mimetype for %s\n", buf);
 328                         lws_return_http_status(wsi,
 329                                       HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE, NULL);
 330                         return -1;
 331                 }
 332
 333                 /* demonstrates how to set a cookie on / */
 334
 335                 other_headers = leaf_path;
 336                 p = (unsigned char *)leaf_path;
 337                 if (!strcmp((const char *)in, "/") &&
 338                            !lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COOKIE)) {
 339                         /* this isn't very unguessable but it'll do for us */
 340                         gettimeofday(&tv, NULL);
 341                         n = sprintf(b64, "test=LWS_%u_%u_COOKIE;Max-Age=360000",
 342                                 (unsigned int)tv.tv_sec,
 343                                 (unsigned int)tv.tv_usec);
 344
 345                         if (lws_add_http_header_by_name(wsi,
 346                                 (unsigned char *)"set-cookie:",
 347                                 (unsigned char *)b64, n, &p,
 348                                 (unsigned char *)leaf_path + sizeof(leaf_path)))
 349                                 return 1;
 350                 }
 351                 if (lws_is_ssl(wsi) && lws_add_http_header_by_name(wsi,
 352                                                 (unsigned char *)
 353                                                 "Strict-Transport-Security:",
 354                                                 (unsigned char *)
 355                                                 "max-age=15768000 ; "
 356                                                 "includeSubDomains", 36, &p,
 357                                                 (unsigned char *)leaf_path +
 358                                                         sizeof(leaf_path)))
 359                         return 1;
 360                 n = (char *)p - leaf_path;
 361
 362                 n = lws_serve_http_file(wsi, buf, mimetype, other_headers, n);
 363                 if (n < 0 || ((n > 0) && lws_http_transaction_completed(wsi)))
 364                         return -1; /* error or can't reuse connection: close the socket */
 365
 366                 /*
 367                  * notice that the sending of the file completes asynchronously,
 368                  * we'll get a LWS_CALLBACK_HTTP_FILE_COMPLETION callback when
 369                  * it's done
 370                  */
 371                 break;
 372
 373         case LWS_CALLBACK_HTTP_BODY:
 374                 strncpy(buf, in, 20);
 375                 buf[20] = '\0';
 376                 if (len < 20)
 377                         buf[len] = '\0';
 378
 379                 lwsl_notice("LWS_CALLBACK_HTTP_BODY: %s... len %d\n",
 380                                 (const char *)buf, (int)len);
 381
 382                 break;
 383
 384         case LWS_CALLBACK_HTTP_BODY_COMPLETION:
 385                 lwsl_notice("LWS_CALLBACK_HTTP_BODY_COMPLETION\n");
 386                 /* the whole of the sent body arrived, close or reuse the connection */
 387                 lws_return_http_status(wsi, HTTP_STATUS_OK, NULL);
 388                 goto try_to_reuse;
 389
 390         case LWS_CALLBACK_HTTP_FILE_COMPLETION:
 391                 goto try_to_reuse;
 392
 393         case LWS_CALLBACK_HTTP_WRITEABLE:
 394                 lwsl_info("LWS_CALLBACK_HTTP_WRITEABLE\n");
 395
 396                 if (pss->client_finished)
 397                         return -1;
 398
 399                 if (pss->fd == LWS_INVALID_FILE)
 400                         goto try_to_reuse;
 401
 402 #ifndef LWS_NO_CLIENT
 403                 if (pss->reason_bf & 2) {
 404                         char *px = buf + LWS_PRE;
 405                         int lenx = sizeof(buf) - LWS_PRE;
 406                         /*
 407                          * our sink is writeable and our source has something
 408                          * to read.  So read a lump of source material of
 409                          * suitable size to send or what's available, whichever
 410                          * is the smaller.
 411                          */
 412                         pss->reason_bf &= ~2;
 413                         wsi1 = lws_get_child(wsi);
 414                         if (!wsi1)
 415                                 break;
 416                         if (lws_http_client_read(wsi1, &px, &lenx) < 0)
 417                                 goto bail;
 418
 419                         if (pss->client_finished)
 420                                 return -1;
 421                         break;
 422                 }
 423 #endif
 424                 /*
 425                  * we can send more of whatever it is we were sending
 426                  */
 427                 sent = 0;
 428                 do {
 429                         /* we'd like the send this much */
 430                         n = sizeof(buffer) - LWS_PRE;
 431
 432                         /* but if the peer told us he wants less, we can adapt */
 433                         m = lws_get_peer_write_allowance(wsi);
 434
 435                         /* -1 means not using a protocol that has this info */
 436                         if (m == 0)
 437                                 /* right now, peer can't handle anything */
 438                                 goto later;
 439
 440                         if (m != -1 && m < n)
 441                                 /* he couldn't handle that much */
 442                                 n = m;
 443
 444                         n = lws_plat_file_read(wsi, pss->fd,
 445                                                &amount, buffer + LWS_PRE, n);
 446                         /* problem reading, close conn */
 447                         if (n < 0) {
 448                                 lwsl_err("problem reading file\n");
 449                                 goto bail;
 450                         }
 451                         n = (int)amount;
 452                         /* sent it all, close conn */
 453                         if (n == 0)
 454                                 goto penultimate;
 455                         /*
 456                          * To support HTTP2, must take care about preamble space
 457                          *
 458                          * identification of when we send the last payload frame
 459                          * is handled by the library itself if you sent a
 460                          * content-length header
 461                          */
 462                         m = lws_write(wsi, buffer + LWS_PRE, n, LWS_WRITE_HTTP);
 463                         if (m < 0) {
 464                                 lwsl_err("write failed\n");
 465                                 /* write failed, close conn */
 466                                 goto bail;
 467                         }
 468                         if (m) /* while still active, extend timeout */
 469                                 lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT, 5);
 470                         sent += m;
 471
 472                 } while (!lws_send_pipe_choked(wsi) && (sent < 1024 * 1024));
 473 later:
 474                 lws_callback_on_writable(wsi);
 475                 break;
 476 penultimate:
 477                 lws_plat_file_close(wsi, pss->fd);
 478                 pss->fd = LWS_INVALID_FILE;
 479                 goto try_to_reuse;
 480
 481 bail:
 482                 lws_plat_file_close(wsi, pss->fd);
 483
 484                 return -1;
 485
 486         /*
 487          * callback for confirming to continue with client IP appear in
 488          * protocol 0 callback since no websocket protocol has been agreed
 489          * yet.  You can just ignore this if you won't filter on client IP
 490          * since the default unhandled callback return is 0 meaning let the
 491          * connection continue.
 492          */
 493         case LWS_CALLBACK_FILTER_NETWORK_CONNECTION:
 494                 /* if we returned non-zero from here, we kill the connection */
 495                 break;
 496
 497 #ifndef LWS_NO_CLIENT
 498         case LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP: {
 499                 char ctype[64], ctlen = 0;
 500                 lwsl_err("LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP\n");
 501                 p = buffer + LWS_PRE;
 502                 end = p + sizeof(buffer) - LWS_PRE;
 503                 if (lws_add_http_header_status(lws_get_parent(wsi), 200, &p, end))
 504                         return 1;
 505                 if (lws_add_http_header_by_token(lws_get_parent(wsi),
 506                                 WSI_TOKEN_HTTP_SERVER,
 507                                 (unsigned char *)"libwebsockets",
 508                                 13, &p, end))
 509                         return 1;
 510
 511                 ctlen = lws_hdr_copy(wsi, ctype, sizeof(ctype), WSI_TOKEN_HTTP_CONTENT_TYPE);
 512                 if (ctlen > 0) {
 513                         if (lws_add_http_header_by_token(lws_get_parent(wsi),
 514                                 WSI_TOKEN_HTTP_CONTENT_TYPE,
 515                                 (unsigned char *)ctype, ctlen, &p, end))
 516                                 return 1;
 517                 }
 518 #if 0
 519                 if (lws_add_http_header_content_length(lws_get_parent(wsi),
 520                                                        file_len, &p, end))
 521                         return 1;
 522 #endif
 523                 if (lws_finalize_http_header(lws_get_parent(wsi), &p, end))
 524                         return 1;
 525
 526                 *p = '\0';
 527                 lwsl_info("%s\n", buffer + LWS_PRE);
 528
 529                 n = lws_write(lws_get_parent(wsi), buffer + LWS_PRE,
 530                               p - (buffer + LWS_PRE),
 531                               LWS_WRITE_HTTP_HEADERS);
 532                 if (n < 0)
 533                         return -1;
 534
 535                 break; }
 536         case LWS_CALLBACK_CLOSED_CLIENT_HTTP:
 537                 //lwsl_err("LWS_CALLBACK_CLOSED_CLIENT_HTTP\n");
 538                 return -1;
 539                 break;
 540         case LWS_CALLBACK_RECEIVE_CLIENT_HTTP:
 541                 //lwsl_err("LWS_CALLBACK_RECEIVE_CLIENT_HTTP: wsi %p\n", wsi);
 542                 assert(lws_get_parent(wsi));
 543                 if (!lws_get_parent(wsi))
 544                         break;
 545                 // lwsl_err("LWS_CALLBACK_RECEIVE_CLIENT_HTTP: wsi %p: sock: %d, parent_wsi: %p, parent_sock:%d,  len %d\n",
 546                 //              wsi, lws_get_socket_fd(wsi),
 547                 //              lws_get_parent(wsi),
 548                 //              lws_get_socket_fd(lws_get_parent(wsi)), len);
 549                 pss1 = lws_wsi_user(lws_get_parent(wsi));
 550                 pss1->reason_bf |= 2;
 551                 lws_callback_on_writable(lws_get_parent(wsi));
 552                 break;
 553         case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ:
 554                 //lwsl_err("LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ len %d\n", len);
 555                 assert(lws_get_parent(wsi));
 556                 m = lws_write(lws_get_parent(wsi), (unsigned char *)in,
 557                                 len, LWS_WRITE_HTTP);
 558                 if (m < 0)
 559                         return -1;
 560                 break;
 561         case LWS_CALLBACK_COMPLETED_CLIENT_HTTP:
 562                 //lwsl_err("LWS_CALLBACK_COMPLETED_CLIENT_HTTP\n");
 563                 assert(lws_get_parent(wsi));
 564                 if (!lws_get_parent(wsi))
 565                         break;
 566                 pss1 = lws_wsi_user(lws_get_parent(wsi));
 567                 pss1->client_finished = 1;
 568                 break;
 569 #endif
 570
 571         /*
 572          * callbacks for managing the external poll() array appear in
 573          * protocol 0 callback
 574          */
 575
 576         case LWS_CALLBACK_LOCK_POLL:
 577                 /*
 578                  * lock mutex to protect pollfd state
 579                  * called before any other POLL related callback
 580                  * if protecting wsi lifecycle change, len == 1
 581                  */
 582                 test_server_lock(len);
 583                 break;
 584
 585         case LWS_CALLBACK_UNLOCK_POLL:
 586                 /*
 587                  * unlock mutex to protect pollfd state when
 588                  * called after any other POLL related callback
 589                  * if protecting wsi lifecycle change, len == 1
 590                  */
 591                 test_server_unlock(len);
 592                 break;
 593
 594 #ifdef EXTERNAL_POLL
 595         case LWS_CALLBACK_ADD_POLL_FD:
 596
 597                 if (count_pollfds >= max_poll_elements) {
 598                         lwsl_err("LWS_CALLBACK_ADD_POLL_FD: too many sockets to track\n");
 599                         return 1;
 600                 }
 601
 602                 fd_lookup[pa->fd] = count_pollfds;
 603                 pollfds[count_pollfds].fd = pa->fd;
 604                 pollfds[count_pollfds].events = pa->events;
 605                 pollfds[count_pollfds++].revents = 0;
 606                 break;
 607
 608         case LWS_CALLBACK_DEL_POLL_FD:
 609                 if (!--count_pollfds)
 610                         break;
 611                 m = fd_lookup[pa->fd];
 612                 /* have the last guy take up the vacant slot */
 613                 pollfds[m] = pollfds[count_pollfds];
 614                 fd_lookup[pollfds[count_pollfds].fd] = m;
 615                 break;
 616
 617         case LWS_CALLBACK_CHANGE_MODE_POLL_FD:
 618                 pollfds[fd_lookup[pa->fd]].events = pa->events;
 619                 break;
 620 #endif
 621
 622         case LWS_CALLBACK_GET_THREAD_ID:
 623                 /*
 624                  * if you will call "lws_callback_on_writable"
 625                  * from a different thread, return the caller thread ID
 626                  * here so lws can use this information to work out if it
 627                  * should signal the poll() loop to exit and restart early
 628                  */
 629
 630                 /* return pthread_getthreadid_np(); */
 631
 632                 break;
 633
 634 #if defined(LWS_USE_POLARSSL)
 635 #else
 636 #if defined(LWS_USE_MBEDTLS)
 637 #else
 638 #if defined(LWS_OPENSSL_SUPPORT)
 639         case LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION:
 640                 /* Verify the client certificate */
 641                 if (!len || (SSL_get_verify_result((SSL*)in) != X509_V_OK)) {
 642                         int err = X509_STORE_CTX_get_error((X509_STORE_CTX*)user);
 643                         int depth = X509_STORE_CTX_get_error_depth((X509_STORE_CTX*)user);
 644                         const char* msg = X509_verify_cert_error_string(err);
 645                         lwsl_err("LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION: SSL error: %s (%d), depth: %d\n", msg, err, depth);
 646                         return 1;
 647                 }
 648                 break;
 649 #if defined(LWS_HAVE_SSL_CTX_set1_param)
 650         case LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS:
 651                 if (crl_path[0]) {
 652                         /* Enable CRL checking */
 653                         X509_VERIFY_PARAM *param = X509_VERIFY_PARAM_new();
 654                         X509_VERIFY_PARAM_set_flags(param, X509_V_FLAG_CRL_CHECK);
 655                         SSL_CTX_set1_param((SSL_CTX*)user, param);
 656                         X509_STORE *store = SSL_CTX_get_cert_store((SSL_CTX*)user);
 657                         X509_LOOKUP *lookup = X509_STORE_add_lookup(store, X509_LOOKUP_file());
 658                         n = X509_load_cert_crl_file(lookup, crl_path, X509_FILETYPE_PEM);
 659                         X509_VERIFY_PARAM_free(param);
 660                         if (n != 1) {
 661                                 char errbuf[256];
 662                                 n = ERR_get_error();
 663                                 lwsl_err("LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS: SSL error: %s (%d)\n", ERR_error_string(n, errbuf), n);
 664                                 return 1;
 665                         }
 666                 }
 667                 break;
 668 #endif
 669 #endif
 670 #endif
 671 #endif
 672
 673         default:
 674                 break;
 675         }
 676
 677         return 0;
 678
 679         /* if we're on HTTP1.1 or 2.0, will keep the idle connection alive */
 680 try_to_reuse:
 681         if (lws_http_transaction_completed(wsi))
 682                 return -1;
 683
 684         return 0;
 685 }