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 <unistd.h>
  28 #include <getopt.h>
  29 #include <string.h>
  30 #include <sys/time.h>
  31 #include <sys/stat.h>
  32 #include <fcntl.h>
  33 #include <assert.h>
  34 #ifdef WIN32
  35
  36 #ifdef EXTERNAL_POLL
  37         #ifndef WIN32_LEAN_AND_MEAN
  38         #define WIN32_LEAN_AND_MEAN
  39         #endif
  40         #include <winsock2.h>
  41         #include <ws2tcpip.h>
  42         #include <stddef.h>
  43
  44         #include "websock-w32.h"
  45 #endif
  46
  47 #else // NOT WIN32
  48 #include <syslog.h>
  49 #endif
  50
  51 #include <signal.h>
  52
  53 #include "../lib/libwebsockets.h"
  54
  55 static int close_testing;
  56 int max_poll_elements;
  57
  58 struct pollfd *pollfds;
  59 int *fd_lookup;
  60 int count_pollfds;
  61 int force_exit = 0;
  62
  63 /*
  64  * This demo server shows how to use libwebsockets for one or more
  65  * websocket protocols in the same server
  66  *
  67  * It defines the following websocket protocols:
  68  *
  69  *  dumb-increment-protocol:  once the socket is opened, an incrementing
  70  *                              ascii string is sent down it every 50ms.
  71  *                              If you send "reset\n" on the websocket, then
  72  *                              the incrementing number is reset to 0.
  73  *
  74  *  lws-mirror-protocol: copies any received packet to every connection also
  75  *                              using this protocol, including the sender
  76  */
  77
  78 enum demo_protocols {
  79         /* always first */
  80         PROTOCOL_HTTP = 0,
  81
  82         PROTOCOL_DUMB_INCREMENT,
  83         PROTOCOL_LWS_MIRROR,
  84
  85         /* always last */
  86         DEMO_PROTOCOL_COUNT
  87 };
  88
  89
  90 #define LOCAL_RESOURCE_PATH INSTALL_DATADIR"/libwebsockets-test-server"
  91 char *resource_path = LOCAL_RESOURCE_PATH;
  92
  93 /*
  94  * We take a strict whitelist approach to stop ../ attacks
  95  */
  96
  97 struct serveable {
  98         const char *urlpath;
  99         const char *mimetype;
 100 };
 101
 102 struct per_session_data__http {
 103         int fd;
 104 };
 105
 106 /*
 107  * this is just an example of parsing handshake headers, you don't need this
 108  * in your code unless you will filter allowing connections by the header
 109  * content
 110  */
 111
 112 static void
 113 dump_handshake_info(struct libwebsocket *wsi)
 114 {
 115         int n;
 116         static const char *token_names[] = {
 117                 /*[WSI_TOKEN_GET_URI]           =*/ "GET URI",
 118                 /*[WSI_TOKEN_POST_URI]          =*/ "POST URI",
 119                 /*[WSI_TOKEN_HOST]              =*/ "Host",
 120                 /*[WSI_TOKEN_CONNECTION]        =*/ "Connection",
 121                 /*[WSI_TOKEN_KEY1]              =*/ "key 1",
 122                 /*[WSI_TOKEN_KEY2]              =*/ "key 2",
 123                 /*[WSI_TOKEN_PROTOCOL]          =*/ "Protocol",
 124                 /*[WSI_TOKEN_UPGRADE]           =*/ "Upgrade",
 125                 /*[WSI_TOKEN_ORIGIN]            =*/ "Origin",
 126                 /*[WSI_TOKEN_DRAFT]             =*/ "Draft",
 127                 /*[WSI_TOKEN_CHALLENGE]         =*/ "Challenge",
 128
 129                 /* new for 04 */
 130                 /*[WSI_TOKEN_KEY]               =*/ "Key",
 131                 /*[WSI_TOKEN_VERSION]           =*/ "Version",
 132                 /*[WSI_TOKEN_SWORIGIN]          =*/ "Sworigin",
 133
 134                 /* new for 05 */
 135                 /*[WSI_TOKEN_EXTENSIONS]        =*/ "Extensions",
 136
 137                 /* client receives these */
 138                 /*[WSI_TOKEN_ACCEPT]            =*/ "Accept",
 139                 /*[WSI_TOKEN_NONCE]             =*/ "Nonce",
 140                 /*[WSI_TOKEN_HTTP]              =*/ "Http",
 141
 142                 "Accept:",
 143                 "If-Modified-Since:",
 144                 "Accept-Encoding:",
 145                 "Accept-Language:",
 146                 "Pragma:",
 147                 "Cache-Control:",
 148                 "Authorization:",
 149                 "Cookie:",
 150                 "Content-Length:",
 151                 "Content-Type:",
 152                 "Date:",
 153                 "Range:",
 154                 "Referer:",
 155                 "Uri-Args:",
 156
 157                 /*[WSI_TOKEN_MUXURL]    =*/ "MuxURL",
 158         };
 159         char buf[256];
 160
 161         for (n = 0; n < sizeof(token_names) / sizeof(token_names[0]); n++) {
 162                 if (!lws_hdr_total_length(wsi, n))
 163                         continue;
 164
 165                 lws_hdr_copy(wsi, buf, sizeof buf, n);
 166
 167                 fprintf(stderr, "    %s = %s\n", token_names[n], buf);
 168         }
 169 }
 170
 171 const char * get_mimetype(const char *file)
 172 {
 173         int n = strlen(file);
 174
 175         if (n < 5)
 176                 return NULL;
 177
 178         if (!strcmp(&file[n - 4], ".ico"))
 179                 return "image/x-icon";
 180
 181         if (!strcmp(&file[n - 4], ".png"))
 182                 return "image/png";
 183
 184         if (!strcmp(&file[n - 5], ".html"))
 185                 return "text/html";
 186
 187         return NULL;
 188 }
 189
 190 /* this protocol server (always the first one) just knows how to do HTTP */
 191
 192 static int callback_http(struct libwebsocket_context *context,
 193                 struct libwebsocket *wsi,
 194                 enum libwebsocket_callback_reasons reason, void *user,
 195                                                            void *in, size_t len)
 196 {
 197 #if 0
 198         char client_name[128];
 199         char client_ip[128];
 200 #endif
 201         char buf[256];
 202         char leaf_path[1024];
 203         char b64[64];
 204         struct timeval tv;
 205         int n, m;
 206         unsigned char *p;
 207         char *other_headers;
 208         static unsigned char buffer[4096];
 209         struct stat stat_buf;
 210         struct per_session_data__http *pss =
 211                         (struct per_session_data__http *)user;
 212         const char *mimetype;
 213 #ifdef EXTERNAL_POLL
 214         int fd = (int)(long)in;
 215 #endif
 216
 217         switch (reason) {
 218         case LWS_CALLBACK_HTTP:
 219
 220                 dump_handshake_info(wsi);
 221
 222                 if (len < 1) {
 223                         libwebsockets_return_http_status(context, wsi,
 224                                                 HTTP_STATUS_BAD_REQUEST, NULL);
 225                         return -1;
 226                 }
 227
 228                 /* this server has no concept of directories */
 229                 if (strchr((const char *)in + 1, '/')) {
 230                         libwebsockets_return_http_status(context, wsi,
 231                                                 HTTP_STATUS_FORBIDDEN, NULL);
 232                         return -1;
 233                 }
 234
 235                 /* if a legal POST URL, let it continue and accept data */
 236                 if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI))
 237                         return 0;
 238
 239                 /* check for the "send a big file by hand" example case */
 240
 241                 if (!strcmp((const char *)in, "/leaf.jpg")) {
 242                         if (strlen(resource_path) > sizeof(leaf_path) - 10)
 243                                 return -1;
 244                         sprintf(leaf_path, "%s/leaf.jpg", resource_path);
 245
 246                         /* well, let's demonstrate how to send the hard way */
 247
 248                         p = buffer;
 249
 250 #ifdef WIN32
 251                         pss->fd = open(leaf_path, O_RDONLY | _O_BINARY);
 252 #else
 253                         pss->fd = open(leaf_path, O_RDONLY);
 254 #endif
 255
 256                         if (pss->fd < 0)
 257                                 return -1;
 258
 259                         fstat(pss->fd, &stat_buf);
 260
 261                         /*
 262                          * we will send a big jpeg file, but it could be
 263                          * anything.  Set the Content-Type: appropriately
 264                          * so the browser knows what to do with it.
 265                          */
 266
 267                         p += sprintf((char *)p,
 268                                 "HTTP/1.0 200 OK\x0d\x0a"
 269                                 "Server: libwebsockets\x0d\x0a"
 270                                 "Content-Type: image/jpeg\x0d\x0a"
 271                                         "Content-Length: %u\x0d\x0a\x0d\x0a",
 272                                         (unsigned int)stat_buf.st_size);
 273
 274                         /*
 275                          * send the http headers...
 276                          * this won't block since it's the first payload sent
 277                          * on the connection since it was established
 278                          * (too small for partial)
 279                          */
 280
 281                         n = libwebsocket_write(wsi, buffer,
 282                                    p - buffer, LWS_WRITE_HTTP);
 283
 284                         if (n < 0) {
 285                                 close(pss->fd);
 286                                 return -1;
 287                         }
 288                         /*
 289                          * book us a LWS_CALLBACK_HTTP_WRITEABLE callback
 290                          */
 291                         libwebsocket_callback_on_writable(context, wsi);
 292                         break;
 293                 }
 294
 295                 /* if not, send a file the easy way */
 296                 strcpy(buf, resource_path);
 297                 if (strcmp(in, "/")) {
 298                         if (*((const char *)in) != '/')
 299                                 strcat(buf, "/");
 300                         strncat(buf, in, sizeof(buf) - strlen(resource_path));
 301                 } else /* default file to serve */
 302                         strcat(buf, "/test.html");
 303                 buf[sizeof(buf) - 1] = '\0';
 304
 305                 /* refuse to serve files we don't understand */
 306                 mimetype = get_mimetype(buf);
 307                 if (!mimetype) {
 308                         lwsl_err("Unknown mimetype for %s\n", buf);
 309                         libwebsockets_return_http_status(context, wsi,
 310                                       HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE, NULL);
 311                         return -1;
 312                 }
 313
 314                 /* demostrates how to set a cookie on / */
 315
 316                 other_headers = NULL;
 317                 if (!strcmp((const char *)in, "/") &&
 318                            !lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COOKIE)) {
 319                         /* this isn't very unguessable but it'll do for us */
 320                         gettimeofday(&tv, NULL);
 321                         sprintf(b64, "LWS_%u_%u_COOKIE",
 322                                 (unsigned int)tv.tv_sec,
 323                                 (unsigned int)tv.tv_usec);
 324
 325                         sprintf(leaf_path,
 326                                 "Set-Cookie: test=LWS_%u_%u_COOKIE;Max-Age=360000\x0d\x0a",
 327                             (unsigned int)tv.tv_sec, (unsigned int)tv.tv_usec);
 328                         other_headers = leaf_path;
 329                         lwsl_err(other_headers);
 330                 }
 331
 332                 if (libwebsockets_serve_http_file(context, wsi, buf,
 333                                                 mimetype, other_headers))
 334                         return -1; /* through completion or error, close the socket */
 335
 336                 /*
 337                  * notice that the sending of the file completes asynchronously,
 338                  * we'll get a LWS_CALLBACK_HTTP_FILE_COMPLETION callback when
 339                  * it's done
 340                  */
 341
 342                 break;
 343
 344         case LWS_CALLBACK_HTTP_BODY:
 345                 strncpy(buf, in, 20);
 346                 buf[20] = '\0';
 347                 if (len < 20)
 348                         buf[len] = '\0';
 349
 350                 lwsl_notice("LWS_CALLBACK_HTTP_BODY: %s... len %d\n",
 351                                 (const char *)buf, (int)len);
 352
 353                 break;
 354
 355         case LWS_CALLBACK_HTTP_BODY_COMPLETION:
 356                 lwsl_notice("LWS_CALLBACK_HTTP_BODY_COMPLETION\n");
 357                 /* the whole of the sent body arried, close the connection */
 358                 libwebsockets_return_http_status(context, wsi,
 359                                                 HTTP_STATUS_OK, NULL);
 360
 361                 return -1;
 362
 363         case LWS_CALLBACK_HTTP_FILE_COMPLETION:
 364 //              lwsl_info("LWS_CALLBACK_HTTP_FILE_COMPLETION seen\n");
 365                 /* kill the connection after we sent one file */
 366                 return -1;
 367
 368         case LWS_CALLBACK_HTTP_WRITEABLE:
 369                 /*
 370                  * we can send more of whatever it is we were sending
 371                  */
 372
 373                 do {
 374                         n = read(pss->fd, buffer, sizeof buffer);
 375                         /* problem reading, close conn */
 376                         if (n < 0)
 377                                 goto bail;
 378                         /* sent it all, close conn */
 379                         if (n == 0)
 380                                 goto bail;
 381                         /*
 382                          * because it's HTTP and not websocket, don't need to take
 383                          * care about pre and postamble
 384                          */
 385                         m = libwebsocket_write(wsi, buffer, n, LWS_WRITE_HTTP);
 386                         if (m < 0)
 387                                 /* write failed, close conn */
 388                                 goto bail;
 389                         if (m != n)
 390                                 /* partial write, adjust */
 391                                 lseek(pss->fd, m - n, SEEK_CUR);
 392
 393                 } while (!lws_send_pipe_choked(wsi));
 394                 libwebsocket_callback_on_writable(context, wsi);
 395                 break;
 396
 397 bail:
 398                 close(pss->fd);
 399                 return -1;
 400
 401         /*
 402          * callback for confirming to continue with client IP appear in
 403          * protocol 0 callback since no websocket protocol has been agreed
 404          * yet.  You can just ignore this if you won't filter on client IP
 405          * since the default uhandled callback return is 0 meaning let the
 406          * connection continue.
 407          */
 408
 409         case LWS_CALLBACK_FILTER_NETWORK_CONNECTION:
 410 #if 0
 411                 libwebsockets_get_peer_addresses(context, wsi, (int)(long)in, client_name,
 412                              sizeof(client_name), client_ip, sizeof(client_ip));
 413
 414                 fprintf(stderr, "Received network connect from %s (%s)\n",
 415                                                         client_name, client_ip);
 416 #endif
 417                 /* if we returned non-zero from here, we kill the connection */
 418                 break;
 419
 420 #ifdef EXTERNAL_POLL
 421         /*
 422          * callbacks for managing the external poll() array appear in
 423          * protocol 0 callback
 424          */
 425
 426         case LWS_CALLBACK_ADD_POLL_FD:
 427
 428                 if (count_pollfds >= max_poll_elements) {
 429                         lwsl_err("LWS_CALLBACK_ADD_POLL_FD: too many sockets to track\n");
 430                         return 1;
 431                 }
 432
 433                 fd_lookup[fd] = count_pollfds;
 434                 pollfds[count_pollfds].fd = fd;
 435                 pollfds[count_pollfds].events = (int)(long)len;
 436                 pollfds[count_pollfds++].revents = 0;
 437                 break;
 438
 439         case LWS_CALLBACK_DEL_POLL_FD:
 440                 if (!--count_pollfds)
 441                         break;
 442                 m = fd_lookup[fd];
 443                 /* have the last guy take up the vacant slot */
 444                 pollfds[m] = pollfds[count_pollfds];
 445                 fd_lookup[pollfds[count_pollfds].fd] = m;
 446                 break;
 447
 448         case LWS_CALLBACK_SET_MODE_POLL_FD:
 449                 pollfds[fd_lookup[fd]].events |= (int)(long)len;
 450                 break;
 451
 452         case LWS_CALLBACK_CLEAR_MODE_POLL_FD:
 453                 pollfds[fd_lookup[fd]].events &= ~(int)(long)len;
 454                 break;
 455 #endif
 456
 457         default:
 458                 break;
 459         }
 460
 461         return 0;
 462 }
 463
 464
 465 /* dumb_increment protocol */
 466
 467 /*
 468  * one of these is auto-created for each connection and a pointer to the
 469  * appropriate instance is passed to the callback in the user parameter
 470  *
 471  * for this example protocol we use it to individualize the count for each
 472  * connection.
 473  */
 474
 475 struct per_session_data__dumb_increment {
 476         int number;
 477 };
 478
 479 static int
 480 callback_dumb_increment(struct libwebsocket_context *context,
 481                         struct libwebsocket *wsi,
 482                         enum libwebsocket_callback_reasons reason,
 483                                                void *user, void *in, size_t len)
 484 {
 485         int n, m;
 486         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 512 +
 487                                                   LWS_SEND_BUFFER_POST_PADDING];
 488         unsigned char *p = &buf[LWS_SEND_BUFFER_PRE_PADDING];
 489         struct per_session_data__dumb_increment *pss = (struct per_session_data__dumb_increment *)user;
 490
 491         switch (reason) {
 492
 493         case LWS_CALLBACK_ESTABLISHED:
 494                 lwsl_info("callback_dumb_increment: "
 495                                                  "LWS_CALLBACK_ESTABLISHED\n");
 496                 pss->number = 0;
 497                 break;
 498
 499         case LWS_CALLBACK_SERVER_WRITEABLE:
 500                 n = sprintf((char *)p, "%d", pss->number++);
 501                 m = libwebsocket_write(wsi, p, n, LWS_WRITE_TEXT);
 502                 if (m < n) {
 503                         lwsl_err("ERROR %d writing to di socket\n", n);
 504                         return -1;
 505                 }
 506                 if (close_testing && pss->number == 50) {
 507                         lwsl_info("close tesing limit, closing\n");
 508                         return -1;
 509                 }
 510                 break;
 511
 512         case LWS_CALLBACK_RECEIVE:
 513 //              fprintf(stderr, "rx %d\n", (int)len);
 514                 if (len < 6)
 515                         break;
 516                 if (strcmp((const char *)in, "reset\n") == 0)
 517                         pss->number = 0;
 518                 break;
 519         /*
 520          * this just demonstrates how to use the protocol filter. If you won't
 521          * study and reject connections based on header content, you don't need
 522          * to handle this callback
 523          */
 524
 525         case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
 526                 dump_handshake_info(wsi);
 527                 /* you could return non-zero here and kill the connection */
 528                 break;
 529
 530         default:
 531                 break;
 532         }
 533
 534         return 0;
 535 }
 536
 537
 538 /* lws-mirror_protocol */
 539
 540 #define MAX_MESSAGE_QUEUE 32
 541
 542 struct per_session_data__lws_mirror {
 543         struct libwebsocket *wsi;
 544         int ringbuffer_tail;
 545 };
 546
 547 struct a_message {
 548         void *payload;
 549         size_t len;
 550 };
 551
 552 static struct a_message ringbuffer[MAX_MESSAGE_QUEUE];
 553 static int ringbuffer_head;
 554
 555 static int
 556 callback_lws_mirror(struct libwebsocket_context *context,
 557                         struct libwebsocket *wsi,
 558                         enum libwebsocket_callback_reasons reason,
 559                                                void *user, void *in, size_t len)
 560 {
 561         int n;
 562         struct per_session_data__lws_mirror *pss = (struct per_session_data__lws_mirror *)user;
 563
 564         switch (reason) {
 565
 566         case LWS_CALLBACK_ESTABLISHED:
 567                 lwsl_info("callback_lws_mirror: LWS_CALLBACK_ESTABLISHED\n");
 568                 pss->ringbuffer_tail = ringbuffer_head;
 569                 pss->wsi = wsi;
 570                 break;
 571
 572         case LWS_CALLBACK_PROTOCOL_DESTROY:
 573                 lwsl_notice("mirror protocol cleaning up\n");
 574                 for (n = 0; n < sizeof ringbuffer / sizeof ringbuffer[0]; n++)
 575                         if (ringbuffer[n].payload)
 576                                 free(ringbuffer[n].payload);
 577                 break;
 578
 579         case LWS_CALLBACK_SERVER_WRITEABLE:
 580                 if (close_testing)
 581                         break;
 582                 while (pss->ringbuffer_tail != ringbuffer_head) {
 583
 584                         n = libwebsocket_write(wsi, (unsigned char *)
 585                                    ringbuffer[pss->ringbuffer_tail].payload +
 586                                    LWS_SEND_BUFFER_PRE_PADDING,
 587                                    ringbuffer[pss->ringbuffer_tail].len,
 588                                                                 LWS_WRITE_TEXT);
 589                         if (n < ringbuffer[pss->ringbuffer_tail].len) {
 590                                 lwsl_err("ERROR %d writing to mirror socket\n", n);
 591                                 return -1;
 592                         }
 593                         if (n < ringbuffer[pss->ringbuffer_tail].len)
 594                                 lwsl_err("mirror partial write %d vs %d\n",
 595                                        n, ringbuffer[pss->ringbuffer_tail].len);
 596
 597                         if (pss->ringbuffer_tail == (MAX_MESSAGE_QUEUE - 1))
 598                                 pss->ringbuffer_tail = 0;
 599                         else
 600                                 pss->ringbuffer_tail++;
 601
 602                         if (((ringbuffer_head - pss->ringbuffer_tail) &
 603                                   (MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 15))
 604                                 libwebsocket_rx_flow_allow_all_protocol(
 605                                                libwebsockets_get_protocol(wsi));
 606
 607                         // lwsl_debug("tx fifo %d\n", (ringbuffer_head - pss->ringbuffer_tail) & (MAX_MESSAGE_QUEUE - 1));
 608
 609                         if (lws_send_pipe_choked(wsi)) {
 610                                 libwebsocket_callback_on_writable(context, wsi);
 611                                 break;
 612                         }
 613                         /*
 614                          * for tests with chrome on same machine as client and
 615                          * server, this is needed to stop chrome choking
 616                          */
 617                         usleep(1);
 618                 }
 619                 break;
 620
 621         case LWS_CALLBACK_RECEIVE:
 622
 623                 if (((ringbuffer_head - pss->ringbuffer_tail) &
 624                                   (MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 1)) {
 625                         lwsl_err("dropping!\n");
 626                         goto choke;
 627                 }
 628
 629                 if (ringbuffer[ringbuffer_head].payload)
 630                         free(ringbuffer[ringbuffer_head].payload);
 631
 632                 ringbuffer[ringbuffer_head].payload =
 633                                 malloc(LWS_SEND_BUFFER_PRE_PADDING + len +
 634                                                   LWS_SEND_BUFFER_POST_PADDING);
 635                 ringbuffer[ringbuffer_head].len = len;
 636                 memcpy((char *)ringbuffer[ringbuffer_head].payload +
 637                                           LWS_SEND_BUFFER_PRE_PADDING, in, len);
 638                 if (ringbuffer_head == (MAX_MESSAGE_QUEUE - 1))
 639                         ringbuffer_head = 0;
 640                 else
 641                         ringbuffer_head++;
 642
 643                 if (((ringbuffer_head - pss->ringbuffer_tail) &
 644                                   (MAX_MESSAGE_QUEUE - 1)) != (MAX_MESSAGE_QUEUE - 2))
 645                         goto done;
 646
 647 choke:
 648                 lwsl_debug("LWS_CALLBACK_RECEIVE: throttling %p\n", wsi);
 649                 libwebsocket_rx_flow_control(wsi, 0);
 650
 651 //              lwsl_debug("rx fifo %d\n", (ringbuffer_head - pss->ringbuffer_tail) & (MAX_MESSAGE_QUEUE - 1));
 652 done:
 653                 libwebsocket_callback_on_writable_all_protocol(
 654                                                libwebsockets_get_protocol(wsi));
 655                 break;
 656
 657         /*
 658          * this just demonstrates how to use the protocol filter. If you won't
 659          * study and reject connections based on header content, you don't need
 660          * to handle this callback
 661          */
 662
 663         case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
 664                 dump_handshake_info(wsi);
 665                 /* you could return non-zero here and kill the connection */
 666                 break;
 667
 668         default:
 669                 break;
 670         }
 671
 672         return 0;
 673 }
 674
 675
 676 /* list of supported protocols and callbacks */
 677
 678 static struct libwebsocket_protocols protocols[] = {
 679         /* first protocol must always be HTTP handler */
 680
 681         {
 682                 "http-only",            /* name */
 683                 callback_http,          /* callback */
 684                 sizeof (struct per_session_data__http), /* per_session_data_size */
 685                 0,                      /* max frame size / rx buffer */
 686         },
 687         {
 688                 "dumb-increment-protocol",
 689                 callback_dumb_increment,
 690                 sizeof(struct per_session_data__dumb_increment),
 691                 10,
 692         },
 693         {
 694                 "lws-mirror-protocol",
 695                 callback_lws_mirror,
 696                 sizeof(struct per_session_data__lws_mirror),
 697                 128,
 698         },
 699         { NULL, NULL, 0, 0 } /* terminator */
 700 };
 701
 702 void sighandler(int sig)
 703 {
 704         force_exit = 1;
 705 }
 706
 707 static struct option options[] = {
 708         { "help",       no_argument,            NULL, 'h' },
 709         { "debug",      required_argument,      NULL, 'd' },
 710         { "port",       required_argument,      NULL, 'p' },
 711         { "ssl",        no_argument,            NULL, 's' },
 712         { "interface",  required_argument,      NULL, 'i' },
 713         { "closetest",  no_argument,            NULL, 'c' },
 714 #ifndef LWS_NO_DAEMONIZE
 715         { "daemonize",  no_argument,            NULL, 'D' },
 716 #endif
 717         { "resource_path", required_argument,           NULL, 'r' },
 718         { NULL, 0, 0, 0 }
 719 };
 720
 721 int main(int argc, char **argv)
 722 {
 723         char cert_path[1024];
 724         char key_path[1024];
 725         int n = 0;
 726         int use_ssl = 0;
 727         struct libwebsocket_context *context;
 728         int opts = 0;
 729         char interface_name[128] = "";
 730         const char *iface = NULL;
 731 #ifndef WIN32
 732         int syslog_options = LOG_PID | LOG_PERROR;
 733 #endif
 734         unsigned int oldus = 0;
 735         struct lws_context_creation_info info;
 736
 737         int debug_level = 7;
 738 #ifndef LWS_NO_DAEMONIZE
 739         int daemonize = 0;
 740 #endif
 741
 742         memset(&info, 0, sizeof info);
 743         info.port = 7681;
 744
 745         while (n >= 0) {
 746                 n = getopt_long(argc, argv, "ci:hsp:d:Dr:", options, NULL);
 747                 if (n < 0)
 748                         continue;
 749                 switch (n) {
 750 #ifndef LWS_NO_DAEMONIZE
 751                 case 'D':
 752                         daemonize = 1;
 753                         #ifndef WIN32
 754                         syslog_options &= ~LOG_PERROR;
 755                         #endif
 756                         break;
 757 #endif
 758                 case 'd':
 759                         debug_level = atoi(optarg);
 760                         break;
 761                 case 's':
 762                         use_ssl = 1;
 763                         break;
 764                 case 'p':
 765                         info.port = atoi(optarg);
 766                         break;
 767                 case 'i':
 768                         strncpy(interface_name, optarg, sizeof interface_name);
 769                         interface_name[(sizeof interface_name) - 1] = '\0';
 770                         iface = interface_name;
 771                         break;
 772                 case 'c':
 773                         close_testing = 1;
 774                         fprintf(stderr, " Close testing mode -- closes on "
 775                                            "client after 50 dumb increments"
 776                                            "and suppresses lws_mirror spam\n");
 777                         break;
 778                 case 'r':
 779                         resource_path = optarg;
 780                         printf("Setting resource path to \"%s\"\n", resource_path);
 781                         break;
 782                 case 'h':
 783                         fprintf(stderr, "Usage: test-server "
 784                                         "[--port=<p>] [--ssl] "
 785                                         "[-d <log bitfield>] "
 786                                         "[--resource_path <path>]\n");
 787                         exit(1);
 788                 }
 789         }
 790
 791 #if !defined(LWS_NO_DAEMONIZE) && !defined(WIN32)
 792         /*
 793          * normally lock path would be /var/lock/lwsts or similar, to
 794          * simplify getting started without having to take care about
 795          * permissions or running as root, set to /tmp/.lwsts-lock
 796          */
 797         if (daemonize && lws_daemonize("/tmp/.lwsts-lock")) {
 798                 fprintf(stderr, "Failed to daemonize\n");
 799                 return 1;
 800         }
 801 #endif
 802
 803         signal(SIGINT, sighandler);
 804
 805 #ifndef WIN32
 806         /* we will only try to log things according to our debug_level */
 807         setlogmask(LOG_UPTO (LOG_DEBUG));
 808         openlog("lwsts", syslog_options, LOG_DAEMON);
 809 #endif
 810
 811         /* tell the library what debug level to emit and to send it to syslog */
 812         lws_set_log_level(debug_level, lwsl_emit_syslog);
 813
 814         lwsl_notice("libwebsockets test server - "
 815                         "(C) Copyright 2010-2013 Andy Green <andy@warmcat.com> - "
 816                                                     "licensed under LGPL2.1\n");
 817 #ifdef EXTERNAL_POLL
 818         max_poll_elements = getdtablesize();
 819         pollfds = malloc(max_poll_elements * sizeof (struct pollfd));
 820         fd_lookup = malloc(max_poll_elements * sizeof (int));
 821         if (pollfds == NULL || fd_lookup == NULL) {
 822                 lwsl_err("Out of memory pollfds=%d\n", max_poll_elements);
 823                 return -1;
 824         }
 825 #endif
 826
 827         info.iface = iface;
 828         info.protocols = protocols;
 829 #ifndef LWS_NO_EXTENSIONS
 830         info.extensions = libwebsocket_get_internal_extensions();
 831 #endif
 832         if (!use_ssl) {
 833                 info.ssl_cert_filepath = NULL;
 834                 info.ssl_private_key_filepath = NULL;
 835         } else {
 836                 if (strlen(resource_path) > sizeof(cert_path) - 32) {
 837                         lwsl_err("resource path too long\n");
 838                         return -1;
 839                 }
 840                 sprintf(cert_path, "%s/libwebsockets-test-server.pem",
 841                                                                 resource_path);
 842                 if (strlen(resource_path) > sizeof(key_path) - 32) {
 843                         lwsl_err("resource path too long\n");
 844                         return -1;
 845                 }
 846                 sprintf(key_path, "%s/libwebsockets-test-server.key.pem",
 847                                                                 resource_path);
 848
 849                 info.ssl_cert_filepath = cert_path;
 850                 info.ssl_private_key_filepath = key_path;
 851         }
 852         info.gid = -1;
 853         info.uid = -1;
 854         info.options = opts;
 855
 856         context = libwebsocket_create_context(&info);
 857         if (context == NULL) {
 858                 lwsl_err("libwebsocket init failed\n");
 859                 return -1;
 860         }
 861
 862         n = 0;
 863         while (n >= 0 && !force_exit) {
 864                 struct timeval tv;
 865
 866                 gettimeofday(&tv, NULL);
 867
 868                 /*
 869                  * This provokes the LWS_CALLBACK_SERVER_WRITEABLE for every
 870                  * live websocket connection using the DUMB_INCREMENT protocol,
 871                  * as soon as it can take more packets (usually immediately)
 872                  */
 873
 874                 if (((unsigned int)tv.tv_usec - oldus) > 50000) {
 875                         libwebsocket_callback_on_writable_all_protocol(&protocols[PROTOCOL_DUMB_INCREMENT]);
 876                         oldus = tv.tv_usec;
 877                 }
 878
 879 #ifdef EXTERNAL_POLL
 880
 881                 /*
 882                  * this represents an existing server's single poll action
 883                  * which also includes libwebsocket sockets
 884                  */
 885
 886                 n = poll(pollfds, count_pollfds, 50);
 887                 if (n < 0)
 888                         continue;
 889
 890
 891                 if (n)
 892                         for (n = 0; n < count_pollfds; n++)
 893                                 if (pollfds[n].revents)
 894                                         /*
 895                                         * returns immediately if the fd does not
 896                                         * match anything under libwebsockets
 897                                         * control
 898                                         */
 899                                         if (libwebsocket_service_fd(context,
 900                                                                   &pollfds[n]) < 0)
 901                                                 goto done;
 902 #else
 903                 /*
 904                  * If libwebsockets sockets are all we care about,
 905                  * you can use this api which takes care of the poll()
 906                  * and looping through finding who needed service.
 907                  *
 908                  * If no socket needs service, it'll return anyway after
 909                  * the number of ms in the second argument.
 910                  */
 911
 912                 n = libwebsocket_service(context, 50);
 913 #endif
 914         }
 915
 916 #ifdef EXTERNAL_POLL
 917 done:
 918 #endif
 919
 920         libwebsocket_context_destroy(context);
 921
 922         lwsl_notice("libwebsockets-test-server exited cleanly\n");
 923
 924 #ifndef WIN32
 925         closelog();
 926 #endif
 927
 928         return 0;
 929 }