test-server/test-server.c

   1 /*
   2  * libwebsockets-test-server - libwebsockets test implementation
   3  *
   4  * Copyright (C) 2010-2011 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 #ifdef CMAKE_BUILD
  22 #include "lws_config.h"
  23 #endif
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <getopt.h>
  28 #include <signal.h>
  29 #include <string.h>
  30 #include <sys/stat.h>
  31 #include <fcntl.h>
  32 #include <assert.h>
  33
  34 #ifdef _WIN32
  35 #include <io.h>
  36 #ifdef EXTERNAL_POLL
  37 #define poll WSAPoll
  38 #endif
  39 #else
  40 #include <syslog.h>
  41 #include <sys/time.h>
  42 #include <unistd.h>
  43 #endif
  44
  45 #include "../lib/libwebsockets.h"
  46
  47 static int close_testing;
  48 int max_poll_elements;
  49
  50 struct pollfd *pollfds;
  51 int *fd_lookup;
  52 int count_pollfds;
  53 static volatile int force_exit = 0;
  54 static struct libwebsocket_context *context;
  55
  56 /*
  57  * This demo server shows how to use libwebsockets for one or more
  58  * websocket protocols in the same server
  59  *
  60  * It defines the following websocket protocols:
  61  *
  62  *  dumb-increment-protocol:  once the socket is opened, an incrementing
  63  *                              ascii string is sent down it every 50ms.
  64  *                              If you send "reset\n" on the websocket, then
  65  *                              the incrementing number is reset to 0.
  66  *
  67  *  lws-mirror-protocol: copies any received packet to every connection also
  68  *                              using this protocol, including the sender
  69  */
  70
  71 enum demo_protocols {
  72         /* always first */
  73         PROTOCOL_HTTP = 0,
  74
  75         PROTOCOL_DUMB_INCREMENT,
  76         PROTOCOL_LWS_MIRROR,
  77
  78         /* always last */
  79         DEMO_PROTOCOL_COUNT
  80 };
  81
  82
  83 #define LOCAL_RESOURCE_PATH INSTALL_DATADIR"/libwebsockets-test-server"
  84 char *resource_path = LOCAL_RESOURCE_PATH;
  85
  86 /*
  87  * We take a strict whitelist approach to stop ../ attacks
  88  */
  89
  90 struct serveable {
  91         const char *urlpath;
  92         const char *mimetype;
  93 };
  94
  95 struct per_session_data__http {
  96         int fd;
  97 };
  98
  99 /*
 100  * this is just an example of parsing handshake headers, you don't need this
 101  * in your code unless you will filter allowing connections by the header
 102  * content
 103  */
 104
 105 static void
 106 dump_handshake_info(struct libwebsocket *wsi)
 107 {
 108         int n;
 109         static const char *token_names[] = {
 110                 /*[WSI_TOKEN_GET_URI]           =*/ "GET URI",
 111                 /*[WSI_TOKEN_POST_URI]          =*/ "POST URI",
 112                 /*[WSI_TOKEN_HOST]              =*/ "Host",
 113                 /*[WSI_TOKEN_CONNECTION]        =*/ "Connection",
 114                 /*[WSI_TOKEN_KEY1]              =*/ "key 1",
 115                 /*[WSI_TOKEN_KEY2]              =*/ "key 2",
 116                 /*[WSI_TOKEN_PROTOCOL]          =*/ "Protocol",
 117                 /*[WSI_TOKEN_UPGRADE]           =*/ "Upgrade",
 118                 /*[WSI_TOKEN_ORIGIN]            =*/ "Origin",
 119                 /*[WSI_TOKEN_DRAFT]             =*/ "Draft",
 120                 /*[WSI_TOKEN_CHALLENGE]         =*/ "Challenge",
 121
 122                 /* new for 04 */
 123                 /*[WSI_TOKEN_KEY]               =*/ "Key",
 124                 /*[WSI_TOKEN_VERSION]           =*/ "Version",
 125                 /*[WSI_TOKEN_SWORIGIN]          =*/ "Sworigin",
 126
 127                 /* new for 05 */
 128                 /*[WSI_TOKEN_EXTENSIONS]        =*/ "Extensions",
 129
 130                 /* client receives these */
 131                 /*[WSI_TOKEN_ACCEPT]            =*/ "Accept",
 132                 /*[WSI_TOKEN_NONCE]             =*/ "Nonce",
 133                 /*[WSI_TOKEN_HTTP]              =*/ "Http",
 134
 135                 "Accept:",
 136                 "If-Modified-Since:",
 137                 "Accept-Encoding:",
 138                 "Accept-Language:",
 139                 "Pragma:",
 140                 "Cache-Control:",
 141                 "Authorization:",
 142                 "Cookie:",
 143                 "Content-Length:",
 144                 "Content-Type:",
 145                 "Date:",
 146                 "Range:",
 147                 "Referer:",
 148                 "Uri-Args:",
 149
 150                 /*[WSI_TOKEN_MUXURL]    =*/ "MuxURL",
 151         };
 152         char buf[256];
 153
 154         for (n = 0; n < sizeof(token_names) / sizeof(token_names[0]); n++) {
 155                 if (!lws_hdr_total_length(wsi, n))
 156                         continue;
 157
 158                 lws_hdr_copy(wsi, buf, sizeof buf, n);
 159
 160                 fprintf(stderr, "    %s = %s\n", token_names[n], buf);
 161         }
 162 }
 163
 164 const char * get_mimetype(const char *file)
 165 {
 166         int n = strlen(file);
 167
 168         if (n < 5)
 169                 return NULL;
 170
 171         if (!strcmp(&file[n - 4], ".ico"))
 172                 return "image/x-icon";
 173
 174         if (!strcmp(&file[n - 4], ".png"))
 175                 return "image/png";
 176
 177         if (!strcmp(&file[n - 5], ".html"))
 178                 return "text/html";
 179
 180         return NULL;
 181 }
 182
 183 /* this protocol server (always the first one) just knows how to do HTTP */
 184
 185 static int callback_http(struct libwebsocket_context *context,
 186                 struct libwebsocket *wsi,
 187                 enum libwebsocket_callback_reasons reason, void *user,
 188                                                            void *in, size_t len)
 189 {
 190 #if 0
 191         char client_name[128];
 192         char client_ip[128];
 193 #endif
 194         char buf[256];
 195         char leaf_path[1024];
 196         char b64[64];
 197         struct timeval tv;
 198         int n, m;
 199         unsigned char *p;
 200         char *other_headers;
 201         static unsigned char buffer[4096];
 202         struct stat stat_buf;
 203         struct per_session_data__http *pss =
 204                         (struct per_session_data__http *)user;
 205         const char *mimetype;
 206 #ifdef EXTERNAL_POLL
 207         struct libwebsocket_pollargs *pa = (struct libwebsocket_pollargs *)in;
 208 #endif
 209
 210         switch (reason) {
 211         case LWS_CALLBACK_HTTP:
 212
 213                 dump_handshake_info(wsi);
 214
 215                 if (len < 1) {
 216                         libwebsockets_return_http_status(context, wsi,
 217                                                 HTTP_STATUS_BAD_REQUEST, NULL);
 218                         return -1;
 219                 }
 220
 221                 /* this server has no concept of directories */
 222                 if (strchr((const char *)in + 1, '/')) {
 223                         libwebsockets_return_http_status(context, wsi,
 224                                                 HTTP_STATUS_FORBIDDEN, NULL);
 225                         return -1;
 226                 }
 227
 228                 /* if a legal POST URL, let it continue and accept data */
 229                 if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI))
 230                         return 0;
 231
 232                 /* check for the "send a big file by hand" example case */
 233
 234                 if (!strcmp((const char *)in, "/leaf.jpg")) {
 235                         if (strlen(resource_path) > sizeof(leaf_path) - 10)
 236                                 return -1;
 237                         sprintf(leaf_path, "%s/leaf.jpg", resource_path);
 238
 239                         /* well, let's demonstrate how to send the hard way */
 240
 241                         p = buffer;
 242
 243 #ifdef WIN32
 244                         pss->fd = open(leaf_path, O_RDONLY | _O_BINARY);
 245 #else
 246                         pss->fd = open(leaf_path, O_RDONLY);
 247 #endif
 248
 249                         if (pss->fd < 0)
 250                                 return -1;
 251
 252                         fstat(pss->fd, &stat_buf);
 253
 254                         /*
 255                          * we will send a big jpeg file, but it could be
 256                          * anything.  Set the Content-Type: appropriately
 257                          * so the browser knows what to do with it.
 258                          */
 259
 260                         p += sprintf((char *)p,
 261                                 "HTTP/1.0 200 OK\x0d\x0a"
 262                                 "Server: libwebsockets\x0d\x0a"
 263                                 "Content-Type: image/jpeg\x0d\x0a"
 264                                         "Content-Length: %u\x0d\x0a\x0d\x0a",
 265                                         (unsigned int)stat_buf.st_size);
 266
 267                         /*
 268                          * send the http headers...
 269                          * this won't block since it's the first payload sent
 270                          * on the connection since it was established
 271                          * (too small for partial)
 272                          */
 273
 274                         n = libwebsocket_write(wsi, buffer,
 275                                    p - buffer, LWS_WRITE_HTTP);
 276
 277                         if (n < 0) {
 278                                 close(pss->fd);
 279                                 return -1;
 280                         }
 281                         /*
 282                          * book us a LWS_CALLBACK_HTTP_WRITEABLE callback
 283                          */
 284                         libwebsocket_callback_on_writable(context, wsi);
 285                         break;
 286                 }
 287
 288                 /* if not, send a file the easy way */
 289                 strcpy(buf, resource_path);
 290                 if (strcmp(in, "/")) {
 291                         if (*((const char *)in) != '/')
 292                                 strcat(buf, "/");
 293                         strncat(buf, in, sizeof(buf) - strlen(resource_path));
 294                 } else /* default file to serve */
 295                         strcat(buf, "/test.html");
 296                 buf[sizeof(buf) - 1] = '\0';
 297
 298                 /* refuse to serve files we don't understand */
 299                 mimetype = get_mimetype(buf);
 300                 if (!mimetype) {
 301                         lwsl_err("Unknown mimetype for %s\n", buf);
 302                         libwebsockets_return_http_status(context, wsi,
 303                                       HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE, NULL);
 304                         return -1;
 305                 }
 306
 307                 /* demostrates how to set a cookie on / */
 308
 309                 other_headers = NULL;
 310                 if (!strcmp((const char *)in, "/") &&
 311                            !lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COOKIE)) {
 312                         /* this isn't very unguessable but it'll do for us */
 313                         gettimeofday(&tv, NULL);
 314                         sprintf(b64, "LWS_%u_%u_COOKIE",
 315                                 (unsigned int)tv.tv_sec,
 316                                 (unsigned int)tv.tv_usec);
 317
 318                         sprintf(leaf_path,
 319                                 "Set-Cookie: test=LWS_%u_%u_COOKIE;Max-Age=360000\x0d\x0a",
 320                             (unsigned int)tv.tv_sec, (unsigned int)tv.tv_usec);
 321                         other_headers = leaf_path;
 322                         lwsl_err(other_headers);
 323                 }
 324
 325                 if (libwebsockets_serve_http_file(context, wsi, buf,
 326                                                 mimetype, other_headers))
 327                         return -1; /* through completion or error, close the socket */
 328
 329                 /*
 330                  * notice that the sending of the file completes asynchronously,
 331                  * we'll get a LWS_CALLBACK_HTTP_FILE_COMPLETION callback when
 332                  * it's done
 333                  */
 334
 335                 break;
 336
 337         case LWS_CALLBACK_HTTP_BODY:
 338                 strncpy(buf, in, 20);
 339                 buf[20] = '\0';
 340                 if (len < 20)
 341                         buf[len] = '\0';
 342
 343                 lwsl_notice("LWS_CALLBACK_HTTP_BODY: %s... len %d\n",
 344                                 (const char *)buf, (int)len);
 345
 346                 break;
 347
 348         case LWS_CALLBACK_HTTP_BODY_COMPLETION:
 349                 lwsl_notice("LWS_CALLBACK_HTTP_BODY_COMPLETION\n");
 350                 /* the whole of the sent body arried, close the connection */
 351                 libwebsockets_return_http_status(context, wsi,
 352                                                 HTTP_STATUS_OK, NULL);
 353
 354                 return -1;
 355
 356         case LWS_CALLBACK_HTTP_FILE_COMPLETION:
 357 //              lwsl_info("LWS_CALLBACK_HTTP_FILE_COMPLETION seen\n");
 358                 /* kill the connection after we sent one file */
 359                 return -1;
 360
 361         case LWS_CALLBACK_HTTP_WRITEABLE:
 362                 /*
 363                  * we can send more of whatever it is we were sending
 364                  */
 365
 366                 do {
 367                         n = read(pss->fd, buffer, sizeof buffer);
 368                         /* problem reading, close conn */
 369                         if (n < 0)
 370                                 goto bail;
 371                         /* sent it all, close conn */
 372                         if (n == 0)
 373                                 goto flush_bail;
 374                         /*
 375                          * because it's HTTP and not websocket, don't need to take
 376                          * care about pre and postamble
 377                          */
 378                         m = libwebsocket_write(wsi, buffer, n, LWS_WRITE_HTTP);
 379                         if (m < 0)
 380                                 /* write failed, close conn */
 381                                 goto bail;
 382                         if (m != n)
 383                                 /* partial write, adjust */
 384                                 lseek(pss->fd, m - n, SEEK_CUR);
 385
 386                 } while (!lws_send_pipe_choked(wsi));
 387                 libwebsocket_callback_on_writable(context, wsi);
 388                 break;
 389 flush_bail:
 390                 /* true if still partial pending */
 391                 if (lws_send_pipe_choked(wsi)) {
 392                         libwebsocket_callback_on_writable(context, wsi);
 393                         break;
 394                 }
 395
 396 bail:
 397                 close(pss->fd);
 398                 return -1;
 399
 400         /*
 401          * callback for confirming to continue with client IP appear in
 402          * protocol 0 callback since no websocket protocol has been agreed
 403          * yet.  You can just ignore this if you won't filter on client IP
 404          * since the default uhandled callback return is 0 meaning let the
 405          * connection continue.
 406          */
 407
 408         case LWS_CALLBACK_FILTER_NETWORK_CONNECTION:
 409 #if 0
 410                 libwebsockets_get_peer_addresses(context, wsi, (int)(long)in, client_name,
 411                              sizeof(client_name), client_ip, sizeof(client_ip));
 412
 413                 fprintf(stderr, "Received network connect from %s (%s)\n",
 414                                                         client_name, client_ip);
 415 #endif
 416                 /* if we returned non-zero from here, we kill the connection */
 417                 break;
 418
 419 #ifdef EXTERNAL_POLL
 420         /*
 421          * callbacks for managing the external poll() array appear in
 422          * protocol 0 callback
 423          */
 424
 425         case LWS_CALLBACK_LOCK_POLL:
 426                 /*
 427                  * lock mutex to protect pollfd state
 428                  * called before any other POLL related callback
 429                  */
 430                 break;
 431
 432         case LWS_CALLBACK_UNLOCK_POLL:
 433                 /*
 434                  * unlock mutex to protect pollfd state when
 435                  * called after any other POLL related callback
 436                  */
 437                 break;
 438
 439         case LWS_CALLBACK_ADD_POLL_FD:
 440
 441                 if (count_pollfds >= max_poll_elements) {
 442                         lwsl_err("LWS_CALLBACK_ADD_POLL_FD: too many sockets to track\n");
 443                         return 1;
 444                 }
 445
 446                 fd_lookup[pa->fd] = count_pollfds;
 447                 pollfds[count_pollfds].fd = pa->fd;
 448                 pollfds[count_pollfds].events = pa->events;
 449                 pollfds[count_pollfds++].revents = 0;
 450                 break;
 451
 452         case LWS_CALLBACK_DEL_POLL_FD:
 453                 if (!--count_pollfds)
 454                         break;
 455                 m = fd_lookup[pa->fd];
 456                 /* have the last guy take up the vacant slot */
 457                 pollfds[m] = pollfds[count_pollfds];
 458                 fd_lookup[pollfds[count_pollfds].fd] = m;
 459                 break;
 460
 461         case LWS_CALLBACK_CHANGE_MODE_POLL_FD:
 462                 pollfds[fd_lookup[pa->fd]].events = pa->events;
 463                 break;
 464
 465 #endif
 466
 467         case LWS_CALLBACK_GET_THREAD_ID:
 468                 /*
 469                  * if you will call "libwebsocket_callback_on_writable"
 470                  * from a different thread, return the caller thread ID
 471                  * here so lws can use this information to work out if it
 472                  * should signal the poll() loop to exit and restart early
 473                  */
 474
 475                 /* return pthread_getthreadid_np(); */
 476
 477                 break;
 478
 479         default:
 480                 break;
 481         }
 482
 483         return 0;
 484 }
 485
 486
 487 /* dumb_increment protocol */
 488
 489 /*
 490  * one of these is auto-created for each connection and a pointer to the
 491  * appropriate instance is passed to the callback in the user parameter
 492  *
 493  * for this example protocol we use it to individualize the count for each
 494  * connection.
 495  */
 496
 497 struct per_session_data__dumb_increment {
 498         int number;
 499 };
 500
 501 static int
 502 callback_dumb_increment(struct libwebsocket_context *context,
 503                         struct libwebsocket *wsi,
 504                         enum libwebsocket_callback_reasons reason,
 505                                                void *user, void *in, size_t len)
 506 {
 507         int n, m;
 508         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 512 +
 509                                                   LWS_SEND_BUFFER_POST_PADDING];
 510         unsigned char *p = &buf[LWS_SEND_BUFFER_PRE_PADDING];
 511         struct per_session_data__dumb_increment *pss = (struct per_session_data__dumb_increment *)user;
 512
 513         switch (reason) {
 514
 515         case LWS_CALLBACK_ESTABLISHED:
 516                 lwsl_info("callback_dumb_increment: "
 517                                                  "LWS_CALLBACK_ESTABLISHED\n");
 518                 pss->number = 0;
 519                 break;
 520
 521         case LWS_CALLBACK_SERVER_WRITEABLE:
 522                 n = sprintf((char *)p, "%d", pss->number++);
 523                 m = libwebsocket_write(wsi, p, n, LWS_WRITE_TEXT);
 524                 if (m < n) {
 525                         lwsl_err("ERROR %d writing to di socket\n", n);
 526                         return -1;
 527                 }
 528                 if (close_testing && pss->number == 50) {
 529                         lwsl_info("close tesing limit, closing\n");
 530                         return -1;
 531                 }
 532                 break;
 533
 534         case LWS_CALLBACK_RECEIVE:
 535 //              fprintf(stderr, "rx %d\n", (int)len);
 536                 if (len < 6)
 537                         break;
 538                 if (strcmp((const char *)in, "reset\n") == 0)
 539                         pss->number = 0;
 540                 break;
 541         /*
 542          * this just demonstrates how to use the protocol filter. If you won't
 543          * study and reject connections based on header content, you don't need
 544          * to handle this callback
 545          */
 546
 547         case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
 548                 dump_handshake_info(wsi);
 549                 /* you could return non-zero here and kill the connection */
 550                 break;
 551
 552         default:
 553                 break;
 554         }
 555
 556         return 0;
 557 }
 558
 559
 560 /* lws-mirror_protocol */
 561
 562 #define MAX_MESSAGE_QUEUE 32
 563
 564 struct per_session_data__lws_mirror {
 565         struct libwebsocket *wsi;
 566         int ringbuffer_tail;
 567 };
 568
 569 struct a_message {
 570         void *payload;
 571         size_t len;
 572 };
 573
 574 static struct a_message ringbuffer[MAX_MESSAGE_QUEUE];
 575 static int ringbuffer_head;
 576
 577 static int
 578 callback_lws_mirror(struct libwebsocket_context *context,
 579                         struct libwebsocket *wsi,
 580                         enum libwebsocket_callback_reasons reason,
 581                                                void *user, void *in, size_t len)
 582 {
 583         int n;
 584         struct per_session_data__lws_mirror *pss = (struct per_session_data__lws_mirror *)user;
 585
 586         switch (reason) {
 587
 588         case LWS_CALLBACK_ESTABLISHED:
 589                 lwsl_info("callback_lws_mirror: LWS_CALLBACK_ESTABLISHED\n");
 590                 pss->ringbuffer_tail = ringbuffer_head;
 591                 pss->wsi = wsi;
 592                 break;
 593
 594         case LWS_CALLBACK_PROTOCOL_DESTROY:
 595                 lwsl_notice("mirror protocol cleaning up\n");
 596                 for (n = 0; n < sizeof ringbuffer / sizeof ringbuffer[0]; n++)
 597                         if (ringbuffer[n].payload)
 598                                 free(ringbuffer[n].payload);
 599                 break;
 600
 601         case LWS_CALLBACK_SERVER_WRITEABLE:
 602                 if (close_testing)
 603                         break;
 604                 while (pss->ringbuffer_tail != ringbuffer_head) {
 605
 606                         n = libwebsocket_write(wsi, (unsigned char *)
 607                                    ringbuffer[pss->ringbuffer_tail].payload +
 608                                    LWS_SEND_BUFFER_PRE_PADDING,
 609                                    ringbuffer[pss->ringbuffer_tail].len,
 610                                                                 LWS_WRITE_TEXT);
 611                         if (n < 0) {
 612                                 lwsl_err("ERROR %d writing to mirror socket\n", n);
 613                                 return -1;
 614                         }
 615                         if (n < ringbuffer[pss->ringbuffer_tail].len)
 616                                 lwsl_err("mirror partial write %d vs %d\n",
 617                                        n, ringbuffer[pss->ringbuffer_tail].len);
 618
 619                         if (pss->ringbuffer_tail == (MAX_MESSAGE_QUEUE - 1))
 620                                 pss->ringbuffer_tail = 0;
 621                         else
 622                                 pss->ringbuffer_tail++;
 623
 624                         if (((ringbuffer_head - pss->ringbuffer_tail) &
 625                                   (MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 15))
 626                                 libwebsocket_rx_flow_allow_all_protocol(
 627                                                libwebsockets_get_protocol(wsi));
 628
 629                         // lwsl_debug("tx fifo %d\n", (ringbuffer_head - pss->ringbuffer_tail) & (MAX_MESSAGE_QUEUE - 1));
 630
 631                         if (lws_send_pipe_choked(wsi)) {
 632                                 libwebsocket_callback_on_writable(context, wsi);
 633                                 break;
 634                         }
 635                         /*
 636                          * for tests with chrome on same machine as client and
 637                          * server, this is needed to stop chrome choking
 638                          */
 639 #ifdef _WIN32
 640                         Sleep(1);
 641 #else
 642                         usleep(1);
 643 #endif
 644                 }
 645                 break;
 646
 647         case LWS_CALLBACK_RECEIVE:
 648
 649                 if (((ringbuffer_head - pss->ringbuffer_tail) &
 650                                   (MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 1)) {
 651                         lwsl_err("dropping!\n");
 652                         goto choke;
 653                 }
 654
 655                 if (ringbuffer[ringbuffer_head].payload)
 656                         free(ringbuffer[ringbuffer_head].payload);
 657
 658                 ringbuffer[ringbuffer_head].payload =
 659                                 malloc(LWS_SEND_BUFFER_PRE_PADDING + len +
 660                                                   LWS_SEND_BUFFER_POST_PADDING);
 661                 ringbuffer[ringbuffer_head].len = len;
 662                 memcpy((char *)ringbuffer[ringbuffer_head].payload +
 663                                           LWS_SEND_BUFFER_PRE_PADDING, in, len);
 664                 if (ringbuffer_head == (MAX_MESSAGE_QUEUE - 1))
 665                         ringbuffer_head = 0;
 666                 else
 667                         ringbuffer_head++;
 668
 669                 if (((ringbuffer_head - pss->ringbuffer_tail) &
 670                                   (MAX_MESSAGE_QUEUE - 1)) != (MAX_MESSAGE_QUEUE - 2))
 671                         goto done;
 672
 673 choke:
 674                 lwsl_debug("LWS_CALLBACK_RECEIVE: throttling %p\n", wsi);
 675                 libwebsocket_rx_flow_control(wsi, 0);
 676
 677 //              lwsl_debug("rx fifo %d\n", (ringbuffer_head - pss->ringbuffer_tail) & (MAX_MESSAGE_QUEUE - 1));
 678 done:
 679                 libwebsocket_callback_on_writable_all_protocol(
 680                                                libwebsockets_get_protocol(wsi));
 681                 break;
 682
 683         /*
 684          * this just demonstrates how to use the protocol filter. If you won't
 685          * study and reject connections based on header content, you don't need
 686          * to handle this callback
 687          */
 688
 689         case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
 690                 dump_handshake_info(wsi);
 691                 /* you could return non-zero here and kill the connection */
 692                 break;
 693
 694         default:
 695                 break;
 696         }
 697
 698         return 0;
 699 }
 700
 701
 702 /* list of supported protocols and callbacks */
 703
 704 static struct libwebsocket_protocols protocols[] = {
 705         /* first protocol must always be HTTP handler */
 706
 707         {
 708                 "http-only",            /* name */
 709                 callback_http,          /* callback */
 710                 sizeof (struct per_session_data__http), /* per_session_data_size */
 711                 0,                      /* max frame size / rx buffer */
 712         },
 713         {
 714                 "dumb-increment-protocol",
 715                 callback_dumb_increment,
 716                 sizeof(struct per_session_data__dumb_increment),
 717                 10,
 718         },
 719         {
 720                 "lws-mirror-protocol",
 721                 callback_lws_mirror,
 722                 sizeof(struct per_session_data__lws_mirror),
 723                 128,
 724         },
 725         { NULL, NULL, 0, 0 } /* terminator */
 726 };
 727
 728 void sighandler(int sig)
 729 {
 730         force_exit = 1;
 731         libwebsocket_cancel_service(context);
 732 }
 733
 734 static struct option options[] = {
 735         { "help",       no_argument,            NULL, 'h' },
 736         { "debug",      required_argument,      NULL, 'd' },
 737         { "port",       required_argument,      NULL, 'p' },
 738         { "ssl",        no_argument,            NULL, 's' },
 739         { "allow-non-ssl",      no_argument,            NULL, 'a' },
 740         { "interface",  required_argument,      NULL, 'i' },
 741         { "closetest",  no_argument,            NULL, 'c' },
 742 #ifndef LWS_NO_DAEMONIZE
 743         { "daemonize",  no_argument,            NULL, 'D' },
 744 #endif
 745         { "resource_path", required_argument,           NULL, 'r' },
 746         { NULL, 0, 0, 0 }
 747 };
 748
 749 int main(int argc, char **argv)
 750 {
 751         char cert_path[1024];
 752         char key_path[1024];
 753         int n = 0;
 754         int use_ssl = 0;
 755         int opts = 0;
 756         char interface_name[128] = "";
 757         const char *iface = NULL;
 758 #ifndef WIN32
 759         int syslog_options = LOG_PID | LOG_PERROR;
 760 #endif
 761         unsigned int oldus = 0;
 762         struct lws_context_creation_info info;
 763
 764         int debug_level = 7;
 765 #ifndef LWS_NO_DAEMONIZE
 766         int daemonize = 0;
 767 #endif
 768
 769         memset(&info, 0, sizeof info);
 770         info.port = 7681;
 771
 772         while (n >= 0) {
 773                 n = getopt_long(argc, argv, "ci:hsap:d:Dr:", options, NULL);
 774                 if (n < 0)
 775                         continue;
 776                 switch (n) {
 777 #ifndef LWS_NO_DAEMONIZE
 778                 case 'D':
 779                         daemonize = 1;
 780                         #ifndef WIN32
 781                         syslog_options &= ~LOG_PERROR;
 782                         #endif
 783                         break;
 784 #endif
 785                 case 'd':
 786                         debug_level = atoi(optarg);
 787                         break;
 788                 case 's':
 789                         use_ssl = 1;
 790                         break;
 791                 case 'a':
 792                         opts |= LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT;
 793                         break;
 794                 case 'p':
 795                         info.port = atoi(optarg);
 796                         break;
 797                 case 'i':
 798                         strncpy(interface_name, optarg, sizeof interface_name);
 799                         interface_name[(sizeof interface_name) - 1] = '\0';
 800                         iface = interface_name;
 801                         break;
 802                 case 'c':
 803                         close_testing = 1;
 804                         fprintf(stderr, " Close testing mode -- closes on "
 805                                            "client after 50 dumb increments"
 806                                            "and suppresses lws_mirror spam\n");
 807                         break;
 808                 case 'r':
 809                         resource_path = optarg;
 810                         printf("Setting resource path to \"%s\"\n", resource_path);
 811                         break;
 812                 case 'h':
 813                         fprintf(stderr, "Usage: test-server "
 814                                         "[--port=<p>] [--ssl] "
 815                                         "[-d <log bitfield>] "
 816                                         "[--resource_path <path>]\n");
 817                         exit(1);
 818                 }
 819         }
 820
 821 #if !defined(LWS_NO_DAEMONIZE) && !defined(WIN32)
 822         /*
 823          * normally lock path would be /var/lock/lwsts or similar, to
 824          * simplify getting started without having to take care about
 825          * permissions or running as root, set to /tmp/.lwsts-lock
 826          */
 827         if (daemonize && lws_daemonize("/tmp/.lwsts-lock")) {
 828                 fprintf(stderr, "Failed to daemonize\n");
 829                 return 1;
 830         }
 831 #endif
 832
 833         signal(SIGINT, sighandler);
 834
 835 #ifndef WIN32
 836         /* we will only try to log things according to our debug_level */
 837         setlogmask(LOG_UPTO (LOG_DEBUG));
 838         openlog("lwsts", syslog_options, LOG_DAEMON);
 839 #endif
 840
 841         /* tell the library what debug level to emit and to send it to syslog */
 842         lws_set_log_level(debug_level, lwsl_emit_syslog);
 843
 844         lwsl_notice("libwebsockets test server - "
 845                         "(C) Copyright 2010-2013 Andy Green <andy@warmcat.com> - "
 846                                                     "licensed under LGPL2.1\n");
 847 #ifdef EXTERNAL_POLL
 848         max_poll_elements = getdtablesize();
 849         pollfds = malloc(max_poll_elements * sizeof (struct pollfd));
 850         fd_lookup = malloc(max_poll_elements * sizeof (int));
 851         if (pollfds == NULL || fd_lookup == NULL) {
 852                 lwsl_err("Out of memory pollfds=%d\n", max_poll_elements);
 853                 return -1;
 854         }
 855 #endif
 856
 857         info.iface = iface;
 858         info.protocols = protocols;
 859 #ifndef LWS_NO_EXTENSIONS
 860         info.extensions = libwebsocket_get_internal_extensions();
 861 #endif
 862         if (!use_ssl) {
 863                 info.ssl_cert_filepath = NULL;
 864                 info.ssl_private_key_filepath = NULL;
 865         } else {
 866                 if (strlen(resource_path) > sizeof(cert_path) - 32) {
 867                         lwsl_err("resource path too long\n");
 868                         return -1;
 869                 }
 870                 sprintf(cert_path, "%s/libwebsockets-test-server.pem",
 871                                                                 resource_path);
 872                 if (strlen(resource_path) > sizeof(key_path) - 32) {
 873                         lwsl_err("resource path too long\n");
 874                         return -1;
 875                 }
 876                 sprintf(key_path, "%s/libwebsockets-test-server.key.pem",
 877                                                                 resource_path);
 878
 879                 info.ssl_cert_filepath = cert_path;
 880                 info.ssl_private_key_filepath = key_path;
 881         }
 882         info.gid = -1;
 883         info.uid = -1;
 884         info.options = opts;
 885
 886         context = libwebsocket_create_context(&info);
 887         if (context == NULL) {
 888                 lwsl_err("libwebsocket init failed\n");
 889                 return -1;
 890         }
 891
 892         n = 0;
 893         while (n >= 0 && !force_exit) {
 894                 struct timeval tv;
 895
 896                 gettimeofday(&tv, NULL);
 897
 898                 /*
 899                  * This provokes the LWS_CALLBACK_SERVER_WRITEABLE for every
 900                  * live websocket connection using the DUMB_INCREMENT protocol,
 901                  * as soon as it can take more packets (usually immediately)
 902                  */
 903
 904                 if (((unsigned int)tv.tv_usec - oldus) > 50000) {
 905                         libwebsocket_callback_on_writable_all_protocol(&protocols[PROTOCOL_DUMB_INCREMENT]);
 906                         oldus = tv.tv_usec;
 907                 }
 908
 909 #ifdef EXTERNAL_POLL
 910
 911                 /*
 912                  * this represents an existing server's single poll action
 913                  * which also includes libwebsocket sockets
 914                  */
 915
 916                 n = poll(pollfds, count_pollfds, 50);
 917                 if (n < 0)
 918                         continue;
 919
 920
 921                 if (n)
 922                         for (n = 0; n < count_pollfds; n++)
 923                                 if (pollfds[n].revents)
 924                                         /*
 925                                         * returns immediately if the fd does not
 926                                         * match anything under libwebsockets
 927                                         * control
 928                                         */
 929                                         if (libwebsocket_service_fd(context,
 930                                                                   &pollfds[n]) < 0)
 931                                                 goto done;
 932 #else
 933                 /*
 934                  * If libwebsockets sockets are all we care about,
 935                  * you can use this api which takes care of the poll()
 936                  * and looping through finding who needed service.
 937                  *
 938                  * If no socket needs service, it'll return anyway after
 939                  * the number of ms in the second argument.
 940                  */
 941
 942                 n = libwebsocket_service(context, 50);
 943 #endif
 944         }
 945
 946 #ifdef EXTERNAL_POLL
 947 done:
 948 #endif
 949
 950         libwebsocket_context_destroy(context);
 951
 952         lwsl_notice("libwebsockets-test-server exited cleanly\n");
 953
 954 #ifndef WIN32
 955         closelog();
 956 #endif
 957
 958         return 0;
 959 }