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 extern int debug_level;
  38
  39 enum demo_protocols {
  40         /* always first */
  41         PROTOCOL_HTTP = 0,
  42
  43         PROTOCOL_DUMB_INCREMENT,
  44         PROTOCOL_LWS_MIRROR,
  45
  46         /* always last */
  47         DEMO_PROTOCOL_COUNT
  48 };
  49
  50 /*
  51  * We take a strict whitelist approach to stop ../ attacks
  52  */
  53 struct serveable {
  54         const char *urlpath;
  55         const char *mimetype;
  56 };
  57
  58 /*
  59  * this is just an example of parsing handshake headers, you don't need this
  60  * in your code unless you will filter allowing connections by the header
  61  * content
  62  */
  63 void
  64 dump_handshake_info(struct lws *wsi)
  65 {
  66         int n = 0, len;
  67         char buf[256];
  68         const unsigned char *c;
  69
  70         do {
  71                 c = lws_token_to_string(n);
  72                 if (!c) {
  73                         n++;
  74                         continue;
  75                 }
  76
  77                 len = lws_hdr_total_length(wsi, n);
  78                 if (!len || len > sizeof(buf) - 1) {
  79                         n++;
  80                         continue;
  81                 }
  82
  83                 lws_hdr_copy(wsi, buf, sizeof buf, n);
  84                 buf[sizeof(buf) - 1] = '\0';
  85
  86                 fprintf(stderr, "    %s = %s\n", (char *)c, buf);
  87                 n++;
  88         } while (c);
  89 }
  90
  91 const char * get_mimetype(const char *file)
  92 {
  93         int n = strlen(file);
  94
  95         if (n < 5)
  96                 return NULL;
  97
  98         if (!strcmp(&file[n - 4], ".ico"))
  99                 return "image/x-icon";
 100
 101         if (!strcmp(&file[n - 4], ".png"))
 102                 return "image/png";
 103
 104         if (!strcmp(&file[n - 5], ".html"))
 105                 return "text/html";
 106
 107         if (!strcmp(&file[n - 4], ".css"))
 108                 return "text/css";
 109
 110         return NULL;
 111 }
 112
 113 /* this protocol server (always the first one) handles HTTP,
 114  *
 115  * Some misc callbacks that aren't associated with a protocol also turn up only
 116  * here on the first protocol server.
 117  */
 118
 119 int callback_http(struct lws *wsi, enum lws_callback_reasons reason, void *user,
 120                   void *in, size_t len)
 121 {
 122         struct per_session_data__http *pss =
 123                         (struct per_session_data__http *)user;
 124         unsigned char buffer[4096 + LWS_PRE];
 125         unsigned long amount, file_len, sent;
 126         char leaf_path[1024];
 127         const char *mimetype;
 128         char *other_headers;
 129         unsigned char *end;
 130         struct timeval tv;
 131         unsigned char *p;
 132 #ifndef LWS_NO_CLIENT
 133         struct per_session_data__http *pss1;
 134         struct lws *wsi1;
 135 #endif
 136         char buf[256];
 137         char b64[64];
 138         int n, m;
 139 #ifdef EXTERNAL_POLL
 140         struct lws_pollargs *pa = (struct lws_pollargs *)in;
 141 #endif
 142
 143         switch (reason) {
 144         case LWS_CALLBACK_HTTP:
 145
 146                 if (debug_level & LLL_INFO) {
 147                         dump_handshake_info(wsi);
 148
 149                         /* dump the individual URI Arg parameters */
 150                         n = 0;
 151                         while (lws_hdr_copy_fragment(wsi, buf, sizeof(buf),
 152                                                      WSI_TOKEN_HTTP_URI_ARGS, n) > 0) {
 153                                 lwsl_notice("URI Arg %d: %s\n", ++n, buf);
 154                         }
 155                 }
 156
 157                 {
 158                         char name[100], rip[50];
 159                         lws_get_peer_addresses(wsi, lws_get_socket_fd(wsi), name,
 160                                                sizeof(name), rip, sizeof(rip));
 161                         sprintf(buf, "%s (%s)", name, rip);
 162                         lwsl_notice("HTTP connect from %s\n", buf);
 163                 }
 164
 165                 if (len < 1) {
 166                         lws_return_http_status(wsi,
 167                                                 HTTP_STATUS_BAD_REQUEST, NULL);
 168                         goto try_to_reuse;
 169                 }
 170
 171 #ifndef LWS_NO_CLIENT
 172                 if (!strncmp(in, "/proxytest", 10)) {
 173                         struct lws_client_connect_info i;
 174                         char *rootpath = "/";
 175                         const char *p = (const char *)in;
 176
 177                         if (lws_get_child(wsi))
 178                                 break;
 179
 180                         pss->client_finished = 0;
 181                         memset(&i,0, sizeof(i));
 182                         i.context = lws_get_context(wsi);
 183                         i.address = "git.libwebsockets.org";
 184                         i.port = 80;
 185                         i.ssl_connection = 0;
 186                         if (p[10])
 187                                 i.path = (char *)in + 10;
 188                         else
 189                                 i.path = rootpath;
 190                         i.host = "git.libwebsockets.org";
 191                         i.origin = NULL;
 192                         i.method = "GET";
 193                         i.parent_wsi = wsi;
 194                         i.uri_replace_from = "git.libwebsockets.org/";
 195                         i.uri_replace_to = "/proxytest/";
 196                         if (!lws_client_connect_via_info(&i)) {
 197                                 lwsl_err("proxy connect fail\n");
 198                                 break;
 199                         }
 200
 201
 202
 203                         break;
 204                 }
 205 #endif
 206
 207 #if 1
 208                 /* this example server has no concept of directories */
 209                 if (strchr((const char *)in + 1, '/')) {
 210                         lws_return_http_status(wsi, HTTP_STATUS_FORBIDDEN, NULL);
 211                         goto try_to_reuse;
 212                 }
 213 #endif
 214
 215 #ifdef LWS_WITH_CGI
 216                 if (!strncmp(in, "/cgitest", 8)) {
 217                         static char *cmd[] = {
 218                                 "/bin/sh",
 219                                 "-c",
 220                                 INSTALL_DATADIR"/libwebsockets-test-server/lws-cgi-test.sh",
 221 //                              "/var/www/cgi-bin/cgit",
 222                                 NULL
 223                         };
 224
 225                         lwsl_notice("%s: cgitest\n", __func__);
 226                         n = lws_cgi(wsi, cmd, 8, 5);
 227                         if (n) {
 228                                 lwsl_err("%s: cgi failed\n");
 229                                 return -1;
 230                         }
 231                         p = buffer + LWS_PRE;
 232                         end = p + sizeof(buffer) - LWS_PRE;
 233
 234                         if (lws_add_http_header_status(wsi, 200, &p, end))
 235                                 return 1;
 236                         if (lws_add_http_header_by_token(wsi, WSI_TOKEN_CONNECTION,
 237                                         (unsigned char *)"close", 5, &p, end))
 238                                 return 1;
 239                         n = lws_write(wsi, buffer + LWS_PRE,
 240                                       p - (buffer + LWS_PRE),
 241                                       LWS_WRITE_HTTP_HEADERS);
 242
 243                         /* the cgi starts by outputting headers, we can't
 244                          *  finalize the headers until we see the end of that
 245                          */
 246
 247                         break;
 248                 }
 249 #endif
 250
 251                 /* if a legal POST URL, let it continue and accept data */
 252                 if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI))
 253                         return 0;
 254
 255                 /* check for the "send a big file by hand" example case */
 256
 257                 if (!strcmp((const char *)in, "/leaf.jpg")) {
 258                         if (strlen(resource_path) > sizeof(leaf_path) - 10)
 259                                 return -1;
 260                         sprintf(leaf_path, "%s/leaf.jpg", resource_path);
 261
 262                         /* well, let's demonstrate how to send the hard way */
 263
 264                         p = buffer + LWS_PRE;
 265                         end = p + sizeof(buffer) - LWS_PRE;
 266
 267                         pss->fd = lws_plat_file_open(wsi, leaf_path, &file_len,
 268                                                      LWS_O_RDONLY);
 269
 270                         if (pss->fd == LWS_INVALID_FILE) {
 271                                 lwsl_err("faild to open file %s\n", leaf_path);
 272                                 return -1;
 273                         }
 274
 275                         /*
 276                          * we will send a big jpeg file, but it could be
 277                          * anything.  Set the Content-Type: appropriately
 278                          * so the browser knows what to do with it.
 279                          *
 280                          * Notice we use the APIs to build the header, which
 281                          * will do the right thing for HTTP 1/1.1 and HTTP2
 282                          * depending on what connection it happens to be working
 283                          * on
 284                          */
 285                         if (lws_add_http_header_status(wsi, 200, &p, end))
 286                                 return 1;
 287                         if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_SERVER,
 288                                         (unsigned char *)"libwebsockets",
 289                                         13, &p, end))
 290                                 return 1;
 291                         if (lws_add_http_header_by_token(wsi,
 292                                         WSI_TOKEN_HTTP_CONTENT_TYPE,
 293                                         (unsigned char *)"image/jpeg",
 294                                         10, &p, end))
 295                                 return 1;
 296                         if (lws_add_http_header_content_length(wsi,
 297                                                                file_len, &p,
 298                                                                end))
 299                                 return 1;
 300                         if (lws_finalize_http_header(wsi, &p, end))
 301                                 return 1;
 302
 303                         /*
 304                          * send the http headers...
 305                          * this won't block since it's the first payload sent
 306                          * on the connection since it was established
 307                          * (too small for partial)
 308                          *
 309                          * Notice they are sent using LWS_WRITE_HTTP_HEADERS
 310                          * which also means you can't send body too in one step,
 311                          * this is mandated by changes in HTTP2
 312                          */
 313
 314                         *p = '\0';
 315                         lwsl_info("%s\n", buffer + LWS_PRE);
 316
 317                         n = lws_write(wsi, buffer + LWS_PRE,
 318                                       p - (buffer + LWS_PRE),
 319                                       LWS_WRITE_HTTP_HEADERS);
 320                         if (n < 0) {
 321                                 lws_plat_file_close(wsi, pss->fd);
 322                                 return -1;
 323                         }
 324                         /*
 325                          * book us a LWS_CALLBACK_HTTP_WRITEABLE callback
 326                          */
 327                         lws_callback_on_writable(wsi);
 328                         break;
 329                 }
 330
 331                 /* if not, send a file the easy way */
 332                 if (!strncmp(in, "/cgit-data/", 11)) {
 333                         in = (char *)in + 11;
 334                         strcpy(buf, "/usr/share/cgit");
 335                 } else
 336                         strcpy(buf, resource_path);
 337
 338                 if (strcmp(in, "/")) {
 339                         if (*((const char *)in) != '/')
 340                                 strcat(buf, "/");
 341                         strncat(buf, in, sizeof(buf) - strlen(buf) - 1);
 342                 } else /* default file to serve */
 343                         strcat(buf, "/test.html");
 344                 buf[sizeof(buf) - 1] = '\0';
 345
 346                 /* refuse to serve files we don't understand */
 347                 mimetype = get_mimetype(buf);
 348                 if (!mimetype) {
 349                         lwsl_err("Unknown mimetype for %s\n", buf);
 350                         lws_return_http_status(wsi,
 351                                       HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE, NULL);
 352                         return -1;
 353                 }
 354
 355                 /* demonstrates how to set a cookie on / */
 356
 357                 other_headers = leaf_path;
 358                 p = (unsigned char *)leaf_path;
 359                 if (!strcmp((const char *)in, "/") &&
 360                            !lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COOKIE)) {
 361                         /* this isn't very unguessable but it'll do for us */
 362                         gettimeofday(&tv, NULL);
 363                         n = sprintf(b64, "test=LWS_%u_%u_COOKIE;Max-Age=360000",
 364                                 (unsigned int)tv.tv_sec,
 365                                 (unsigned int)tv.tv_usec);
 366
 367                         if (lws_add_http_header_by_name(wsi,
 368                                 (unsigned char *)"set-cookie:",
 369                                 (unsigned char *)b64, n, &p,
 370                                 (unsigned char *)leaf_path + sizeof(leaf_path)))
 371                                 return 1;
 372                 }
 373                 if (lws_is_ssl(wsi) && lws_add_http_header_by_name(wsi,
 374                                                 (unsigned char *)
 375                                                 "Strict-Transport-Security:",
 376                                                 (unsigned char *)
 377                                                 "max-age=15768000 ; "
 378                                                 "includeSubDomains", 36, &p,
 379                                                 (unsigned char *)leaf_path +
 380                                                         sizeof(leaf_path)))
 381                         return 1;
 382                 n = (char *)p - leaf_path;
 383
 384                 n = lws_serve_http_file(wsi, buf, mimetype, other_headers, n);
 385                 if (n < 0 || ((n > 0) && lws_http_transaction_completed(wsi)))
 386                         return -1; /* error or can't reuse connection: close the socket */
 387
 388                 /*
 389                  * notice that the sending of the file completes asynchronously,
 390                  * we'll get a LWS_CALLBACK_HTTP_FILE_COMPLETION callback when
 391                  * it's done
 392                  */
 393                 break;
 394
 395         case LWS_CALLBACK_HTTP_BODY:
 396                 strncpy(buf, in, 20);
 397                 buf[20] = '\0';
 398                 if (len < 20)
 399                         buf[len] = '\0';
 400
 401                 lwsl_notice("LWS_CALLBACK_HTTP_BODY: %s... len %d\n",
 402                                 (const char *)buf, (int)len);
 403
 404                 break;
 405
 406         case LWS_CALLBACK_HTTP_BODY_COMPLETION:
 407                 lwsl_notice("LWS_CALLBACK_HTTP_BODY_COMPLETION\n");
 408                 /* the whole of the sent body arrived, close or reuse the connection */
 409                 lws_return_http_status(wsi, HTTP_STATUS_OK, NULL);
 410                 goto try_to_reuse;
 411
 412         case LWS_CALLBACK_HTTP_FILE_COMPLETION:
 413                 goto try_to_reuse;
 414
 415         case LWS_CALLBACK_HTTP_WRITEABLE:
 416                 lwsl_info("LWS_CALLBACK_HTTP_WRITEABLE\n");
 417
 418                 if (pss->client_finished)
 419                         return -1;
 420
 421                 if (pss->fd == LWS_INVALID_FILE)
 422                         goto try_to_reuse;
 423 #ifdef LWS_WITH_CGI
 424                 if (pss->reason_bf & 1) {
 425                         if (lws_cgi_write_split_stdout_headers(wsi) < 0)
 426                                 goto bail;
 427
 428                         pss->reason_bf &= ~1;
 429                         break;
 430                 }
 431 #endif
 432 #ifndef LWS_NO_CLIENT
 433                 if (pss->reason_bf & 2) {
 434                         char *px = buf + LWS_PRE;
 435                         int lenx = sizeof(buf) - LWS_PRE;
 436                         /*
 437                          * our sink is writeable and our source has something
 438                          * to read.  So read a lump of source material of
 439                          * suitable size to send or what's available, whichever
 440                          * is the smaller.
 441                          */
 442                         pss->reason_bf &= ~2;
 443                         wsi1 = lws_get_child(wsi);
 444                         if (!wsi1)
 445                                 break;
 446                         if (lws_http_client_read(wsi1, &px, &lenx) < 0)
 447                                 goto bail;
 448
 449                         if (pss->client_finished)
 450                                 return -1;
 451                         break;
 452                 }
 453 #endif
 454                 /*
 455                  * we can send more of whatever it is we were sending
 456                  */
 457                 sent = 0;
 458                 do {
 459                         /* we'd like the send this much */
 460                         n = sizeof(buffer) - LWS_PRE;
 461
 462                         /* but if the peer told us he wants less, we can adapt */
 463                         m = lws_get_peer_write_allowance(wsi);
 464
 465                         /* -1 means not using a protocol that has this info */
 466                         if (m == 0)
 467                                 /* right now, peer can't handle anything */
 468                                 goto later;
 469
 470                         if (m != -1 && m < n)
 471                                 /* he couldn't handle that much */
 472                                 n = m;
 473
 474                         n = lws_plat_file_read(wsi, pss->fd,
 475                                                &amount, buffer + LWS_PRE, n);
 476                         /* problem reading, close conn */
 477                         if (n < 0) {
 478                                 lwsl_err("problem reading file\n");
 479                                 goto bail;
 480                         }
 481                         n = (int)amount;
 482                         /* sent it all, close conn */
 483                         if (n == 0)
 484                                 goto penultimate;
 485                         /*
 486                          * To support HTTP2, must take care about preamble space
 487                          *
 488                          * identification of when we send the last payload frame
 489                          * is handled by the library itself if you sent a
 490                          * content-length header
 491                          */
 492                         m = lws_write(wsi, buffer + LWS_PRE, n, LWS_WRITE_HTTP);
 493                         if (m < 0) {
 494                                 lwsl_err("write failed\n");
 495                                 /* write failed, close conn */
 496                                 goto bail;
 497                         }
 498                         if (m) /* while still active, extend timeout */
 499                                 lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT, 5);
 500                         sent += m;
 501
 502                 } while (!lws_send_pipe_choked(wsi) && (sent < 1024 * 1024));
 503 later:
 504                 lws_callback_on_writable(wsi);
 505                 break;
 506 penultimate:
 507                 lws_plat_file_close(wsi, pss->fd);
 508                 pss->fd = LWS_INVALID_FILE;
 509                 goto try_to_reuse;
 510
 511 bail:
 512                 lws_plat_file_close(wsi, pss->fd);
 513
 514                 return -1;
 515
 516         /*
 517          * callback for confirming to continue with client IP appear in
 518          * protocol 0 callback since no websocket protocol has been agreed
 519          * yet.  You can just ignore this if you won't filter on client IP
 520          * since the default unhandled callback return is 0 meaning let the
 521          * connection continue.
 522          */
 523         case LWS_CALLBACK_FILTER_NETWORK_CONNECTION:
 524                 /* if we returned non-zero from here, we kill the connection */
 525                 break;
 526
 527 #ifndef LWS_NO_CLIENT
 528         case LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP: {
 529                 char ctype[64], ctlen = 0;
 530                 lwsl_err("LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP\n");
 531                 p = buffer + LWS_PRE;
 532                 end = p + sizeof(buffer) - LWS_PRE;
 533                 if (lws_add_http_header_status(lws_get_parent(wsi), 200, &p, end))
 534                         return 1;
 535                 if (lws_add_http_header_by_token(lws_get_parent(wsi),
 536                                 WSI_TOKEN_HTTP_SERVER,
 537                                 (unsigned char *)"libwebsockets",
 538                                 13, &p, end))
 539                         return 1;
 540
 541                 ctlen = lws_hdr_copy(wsi, ctype, sizeof(ctype), WSI_TOKEN_HTTP_CONTENT_TYPE);
 542                 if (ctlen > 0) {
 543                         if (lws_add_http_header_by_token(lws_get_parent(wsi),
 544                                 WSI_TOKEN_HTTP_CONTENT_TYPE,
 545                                 (unsigned char *)ctype, ctlen, &p, end))
 546                                 return 1;
 547                 }
 548 #if 0
 549                 if (lws_add_http_header_content_length(lws_get_parent(wsi),
 550                                                        file_len, &p, end))
 551                         return 1;
 552 #endif
 553                 if (lws_finalize_http_header(lws_get_parent(wsi), &p, end))
 554                         return 1;
 555
 556                 *p = '\0';
 557                 lwsl_info("%s\n", buffer + LWS_PRE);
 558
 559                 n = lws_write(lws_get_parent(wsi), buffer + LWS_PRE,
 560                               p - (buffer + LWS_PRE),
 561                               LWS_WRITE_HTTP_HEADERS);
 562                 if (n < 0)
 563                         return -1;
 564
 565                 break; }
 566         case LWS_CALLBACK_CLOSED_CLIENT_HTTP:
 567                 //lwsl_err("LWS_CALLBACK_CLOSED_CLIENT_HTTP\n");
 568                 return -1;
 569                 break;
 570         case LWS_CALLBACK_RECEIVE_CLIENT_HTTP:
 571                 //lwsl_err("LWS_CALLBACK_RECEIVE_CLIENT_HTTP: wsi %p\n", wsi);
 572                 assert(lws_get_parent(wsi));
 573                 if (!lws_get_parent(wsi))
 574                         break;
 575                 // lwsl_err("LWS_CALLBACK_RECEIVE_CLIENT_HTTP: wsi %p: sock: %d, parent_wsi: %p, parent_sock:%d,  len %d\n",
 576                 //              wsi, lws_get_socket_fd(wsi),
 577                 //              lws_get_parent(wsi),
 578                 //              lws_get_socket_fd(lws_get_parent(wsi)), len);
 579                 pss1 = lws_wsi_user(lws_get_parent(wsi));
 580                 pss1->reason_bf |= 2;
 581                 lws_callback_on_writable(lws_get_parent(wsi));
 582                 break;
 583         case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ:
 584                 //lwsl_err("LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ len %d\n", len);
 585                 assert(lws_get_parent(wsi));
 586                 m = lws_write(lws_get_parent(wsi), (unsigned char *)in,
 587                                 len, LWS_WRITE_HTTP);
 588                 if (m < 0)
 589                         return -1;
 590                 break;
 591         case LWS_CALLBACK_COMPLETED_CLIENT_HTTP:
 592                 //lwsl_err("LWS_CALLBACK_COMPLETED_CLIENT_HTTP\n");
 593                 assert(lws_get_parent(wsi));
 594                 if (!lws_get_parent(wsi))
 595                         break;
 596                 pss1 = lws_wsi_user(lws_get_parent(wsi));
 597                 pss1->client_finished = 1;
 598                 break;
 599 #endif
 600
 601 #ifdef LWS_WITH_CGI
 602         /* CGI IO events (POLLIN/OUT) appear here our demo user code policy is
 603          *
 604          *  - POST data goes on subprocess stdin
 605          *  - subprocess stdout goes on http via writeable callback
 606          *  - subprocess stderr goes to the logs
 607          */
 608         case LWS_CALLBACK_CGI:
 609                 pss->args = *((struct lws_cgi_args *)in);
 610                 //lwsl_notice("LWS_CALLBACK_CGI: ch %d\n", pss->args.ch);
 611                 switch (pss->args.ch) { /* which of stdin/out/err ? */
 612                 case LWS_STDIN:
 613                         /* TBD stdin rx flow control */
 614                         break;
 615                 case LWS_STDOUT:
 616                         pss->reason_bf |= 1;
 617                         /* when writing to MASTER would not block */
 618                         lws_callback_on_writable(wsi);
 619                         break;
 620                 case LWS_STDERR:
 621                         n = read(lws_get_socket_fd(pss->args.stdwsi[LWS_STDERR]),
 622                                         buf, 127);
 623                         //lwsl_notice("stderr reads %d\n", n);
 624                         if (n > 0) {
 625                                 if (buf[n - 1] != '\n')
 626                                         buf[n++] = '\n';
 627                                 buf[n] = '\0';
 628                                 lwsl_notice("CGI-stderr: %s\n", buf);
 629                         }
 630                         break;
 631                 }
 632                 break;
 633
 634         case LWS_CALLBACK_CGI_TERMINATED:
 635                 //lwsl_notice("LWS_CALLBACK_CGI_TERMINATED\n");
 636                 /* because we sent on openended http, close the connection */
 637                 return -1;
 638
 639         case LWS_CALLBACK_CGI_STDIN_DATA:  /* POST body for stdin */
 640                 //lwsl_notice("LWS_CALLBACK_CGI_STDIN_DATA\n");
 641                 pss->args = *((struct lws_cgi_args *)in);
 642                 n = write(lws_get_socket_fd(pss->args.stdwsi[LWS_STDIN]),
 643                           pss->args.data, pss->args.len);
 644                 //lwsl_notice("LWS_CALLBACK_CGI_STDIN_DATA: write says %d", n);
 645                 if (n < pss->args.len)
 646                         lwsl_notice("LWS_CALLBACK_CGI_STDIN_DATA: sent %d only %d went",
 647                                         n, pss->args.len);
 648                 return n;
 649 #endif
 650
 651         /*
 652          * callbacks for managing the external poll() array appear in
 653          * protocol 0 callback
 654          */
 655
 656         case LWS_CALLBACK_LOCK_POLL:
 657                 /*
 658                  * lock mutex to protect pollfd state
 659                  * called before any other POLL related callback
 660                  * if protecting wsi lifecycle change, len == 1
 661                  */
 662                 test_server_lock(len);
 663                 break;
 664
 665         case LWS_CALLBACK_UNLOCK_POLL:
 666                 /*
 667                  * unlock mutex to protect pollfd state when
 668                  * called after any other POLL related callback
 669                  * if protecting wsi lifecycle change, len == 1
 670                  */
 671                 test_server_unlock(len);
 672                 break;
 673
 674 #ifdef EXTERNAL_POLL
 675         case LWS_CALLBACK_ADD_POLL_FD:
 676
 677                 if (count_pollfds >= max_poll_elements) {
 678                         lwsl_err("LWS_CALLBACK_ADD_POLL_FD: too many sockets to track\n");
 679                         return 1;
 680                 }
 681
 682                 fd_lookup[pa->fd] = count_pollfds;
 683                 pollfds[count_pollfds].fd = pa->fd;
 684                 pollfds[count_pollfds].events = pa->events;
 685                 pollfds[count_pollfds++].revents = 0;
 686                 break;
 687
 688         case LWS_CALLBACK_DEL_POLL_FD:
 689                 if (!--count_pollfds)
 690                         break;
 691                 m = fd_lookup[pa->fd];
 692                 /* have the last guy take up the vacant slot */
 693                 pollfds[m] = pollfds[count_pollfds];
 694                 fd_lookup[pollfds[count_pollfds].fd] = m;
 695                 break;
 696
 697         case LWS_CALLBACK_CHANGE_MODE_POLL_FD:
 698                 pollfds[fd_lookup[pa->fd]].events = pa->events;
 699                 break;
 700 #endif
 701
 702         case LWS_CALLBACK_GET_THREAD_ID:
 703                 /*
 704                  * if you will call "lws_callback_on_writable"
 705                  * from a different thread, return the caller thread ID
 706                  * here so lws can use this information to work out if it
 707                  * should signal the poll() loop to exit and restart early
 708                  */
 709
 710                 /* return pthread_getthreadid_np(); */
 711
 712                 break;
 713
 714         default:
 715                 break;
 716         }
 717
 718         return 0;
 719
 720         /* if we're on HTTP1.1 or 2.0, will keep the idle connection alive */
 721 try_to_reuse:
 722         if (lws_http_transaction_completed(wsi))
 723                 return -1;
 724
 725         return 0;
 726 }