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                         if (m) /* while still active, extend timeout */
 387                                 libwebsocket_set_timeout(wsi,
 388                                         PENDING_TIMEOUT_HTTP_CONTENT, 5);
 389
 390                 } while (!lws_send_pipe_choked(wsi));
 391                 libwebsocket_callback_on_writable(context, wsi);
 392                 break;
 393 flush_bail:
 394                 /* true if still partial pending */
 395                 if (lws_send_pipe_choked(wsi)) {
 396                         libwebsocket_callback_on_writable(context, wsi);
 397                         break;
 398                 }
 399
 400 bail:
 401                 close(pss->fd);
 402                 return -1;
 403
 404         /*
 405          * callback for confirming to continue with client IP appear in
 406          * protocol 0 callback since no websocket protocol has been agreed
 407          * yet.  You can just ignore this if you won't filter on client IP
 408          * since the default uhandled callback return is 0 meaning let the
 409          * connection continue.
 410          */
 411
 412         case LWS_CALLBACK_FILTER_NETWORK_CONNECTION:
 413 #if 0
 414                 libwebsockets_get_peer_addresses(context, wsi, (int)(long)in, client_name,
 415                              sizeof(client_name), client_ip, sizeof(client_ip));
 416
 417                 fprintf(stderr, "Received network connect from %s (%s)\n",
 418                                                         client_name, client_ip);
 419 #endif
 420                 /* if we returned non-zero from here, we kill the connection */
 421                 break;
 422
 423 #ifdef EXTERNAL_POLL
 424         /*
 425          * callbacks for managing the external poll() array appear in
 426          * protocol 0 callback
 427          */
 428
 429         case LWS_CALLBACK_LOCK_POLL:
 430                 /*
 431                  * lock mutex to protect pollfd state
 432                  * called before any other POLL related callback
 433                  */
 434                 break;
 435
 436         case LWS_CALLBACK_UNLOCK_POLL:
 437                 /*
 438                  * unlock mutex to protect pollfd state when
 439                  * called after any other POLL related callback
 440                  */
 441                 break;
 442
 443         case LWS_CALLBACK_ADD_POLL_FD:
 444
 445                 if (count_pollfds >= max_poll_elements) {
 446                         lwsl_err("LWS_CALLBACK_ADD_POLL_FD: too many sockets to track\n");
 447                         return 1;
 448                 }
 449
 450                 fd_lookup[pa->fd] = count_pollfds;
 451                 pollfds[count_pollfds].fd = pa->fd;
 452                 pollfds[count_pollfds].events = pa->events;
 453                 pollfds[count_pollfds++].revents = 0;
 454                 break;
 455
 456         case LWS_CALLBACK_DEL_POLL_FD:
 457                 if (!--count_pollfds)
 458                         break;
 459                 m = fd_lookup[pa->fd];
 460                 /* have the last guy take up the vacant slot */
 461                 pollfds[m] = pollfds[count_pollfds];
 462                 fd_lookup[pollfds[count_pollfds].fd] = m;
 463                 break;
 464
 465         case LWS_CALLBACK_CHANGE_MODE_POLL_FD:
 466                 pollfds[fd_lookup[pa->fd]].events = pa->events;
 467                 break;
 468
 469 #endif
 470
 471         case LWS_CALLBACK_GET_THREAD_ID:
 472                 /*
 473                  * if you will call "libwebsocket_callback_on_writable"
 474                  * from a different thread, return the caller thread ID
 475                  * here so lws can use this information to work out if it
 476                  * should signal the poll() loop to exit and restart early
 477                  */
 478
 479                 /* return pthread_getthreadid_np(); */
 480
 481                 break;
 482
 483         default:
 484                 break;
 485         }
 486
 487         return 0;
 488 }
 489
 490
 491 /* dumb_increment protocol */
 492
 493 /*
 494  * one of these is auto-created for each connection and a pointer to the
 495  * appropriate instance is passed to the callback in the user parameter
 496  *
 497  * for this example protocol we use it to individualize the count for each
 498  * connection.
 499  */
 500
 501 struct per_session_data__dumb_increment {
 502         int number;
 503 };
 504
 505 static int
 506 callback_dumb_increment(struct libwebsocket_context *context,
 507                         struct libwebsocket *wsi,
 508                         enum libwebsocket_callback_reasons reason,
 509                                                void *user, void *in, size_t len)
 510 {
 511         int n, m;
 512         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 512 +
 513                                                   LWS_SEND_BUFFER_POST_PADDING];
 514         unsigned char *p = &buf[LWS_SEND_BUFFER_PRE_PADDING];
 515         struct per_session_data__dumb_increment *pss = (struct per_session_data__dumb_increment *)user;
 516
 517         switch (reason) {
 518
 519         case LWS_CALLBACK_ESTABLISHED:
 520                 lwsl_info("callback_dumb_increment: "
 521                                                  "LWS_CALLBACK_ESTABLISHED\n");
 522                 pss->number = 0;
 523                 break;
 524
 525         case LWS_CALLBACK_SERVER_WRITEABLE:
 526                 n = sprintf((char *)p, "%d", pss->number++);
 527                 m = libwebsocket_write(wsi, p, n, LWS_WRITE_TEXT);
 528                 if (m < n) {
 529                         lwsl_err("ERROR %d writing to di socket\n", n);
 530                         return -1;
 531                 }
 532                 if (close_testing && pss->number == 50) {
 533                         lwsl_info("close tesing limit, closing\n");
 534                         return -1;
 535                 }
 536                 break;
 537
 538         case LWS_CALLBACK_RECEIVE:
 539 //              fprintf(stderr, "rx %d\n", (int)len);
 540                 if (len < 6)
 541                         break;
 542                 if (strcmp((const char *)in, "reset\n") == 0)
 543                         pss->number = 0;
 544                 break;
 545         /*
 546          * this just demonstrates how to use the protocol filter. If you won't
 547          * study and reject connections based on header content, you don't need
 548          * to handle this callback
 549          */
 550
 551         case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
 552                 dump_handshake_info(wsi);
 553                 /* you could return non-zero here and kill the connection */
 554                 break;
 555
 556         default:
 557                 break;
 558         }
 559
 560         return 0;
 561 }
 562
 563
 564 /* lws-mirror_protocol */
 565
 566 #define MAX_MESSAGE_QUEUE 32
 567
 568 struct per_session_data__lws_mirror {
 569         struct libwebsocket *wsi;
 570         int ringbuffer_tail;
 571 };
 572
 573 struct a_message {
 574         void *payload;
 575         size_t len;
 576 };
 577
 578 static struct a_message ringbuffer[MAX_MESSAGE_QUEUE];
 579 static int ringbuffer_head;
 580
 581 static int
 582 callback_lws_mirror(struct libwebsocket_context *context,
 583                         struct libwebsocket *wsi,
 584                         enum libwebsocket_callback_reasons reason,
 585                                                void *user, void *in, size_t len)
 586 {
 587         int n;
 588         struct per_session_data__lws_mirror *pss = (struct per_session_data__lws_mirror *)user;
 589
 590         switch (reason) {
 591
 592         case LWS_CALLBACK_ESTABLISHED:
 593                 lwsl_info("callback_lws_mirror: LWS_CALLBACK_ESTABLISHED\n");
 594                 pss->ringbuffer_tail = ringbuffer_head;
 595                 pss->wsi = wsi;
 596                 break;
 597
 598         case LWS_CALLBACK_PROTOCOL_DESTROY:
 599                 lwsl_notice("mirror protocol cleaning up\n");
 600                 for (n = 0; n < sizeof ringbuffer / sizeof ringbuffer[0]; n++)
 601                         if (ringbuffer[n].payload)
 602                                 free(ringbuffer[n].payload);
 603                 break;
 604
 605         case LWS_CALLBACK_SERVER_WRITEABLE:
 606                 if (close_testing)
 607                         break;
 608                 while (pss->ringbuffer_tail != ringbuffer_head) {
 609
 610                         n = libwebsocket_write(wsi, (unsigned char *)
 611                                    ringbuffer[pss->ringbuffer_tail].payload +
 612                                    LWS_SEND_BUFFER_PRE_PADDING,
 613                                    ringbuffer[pss->ringbuffer_tail].len,
 614                                                                 LWS_WRITE_TEXT);
 615                         if (n < 0) {
 616                                 lwsl_err("ERROR %d writing to mirror socket\n", n);
 617                                 return -1;
 618                         }
 619                         if (n < ringbuffer[pss->ringbuffer_tail].len)
 620                                 lwsl_err("mirror partial write %d vs %d\n",
 621                                        n, ringbuffer[pss->ringbuffer_tail].len);
 622
 623                         if (pss->ringbuffer_tail == (MAX_MESSAGE_QUEUE - 1))
 624                                 pss->ringbuffer_tail = 0;
 625                         else
 626                                 pss->ringbuffer_tail++;
 627
 628                         if (((ringbuffer_head - pss->ringbuffer_tail) &
 629                                   (MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 15))
 630                                 libwebsocket_rx_flow_allow_all_protocol(
 631                                                libwebsockets_get_protocol(wsi));
 632
 633                         // lwsl_debug("tx fifo %d\n", (ringbuffer_head - pss->ringbuffer_tail) & (MAX_MESSAGE_QUEUE - 1));
 634
 635                         if (lws_send_pipe_choked(wsi)) {
 636                                 libwebsocket_callback_on_writable(context, wsi);
 637                                 break;
 638                         }
 639                         /*
 640                          * for tests with chrome on same machine as client and
 641                          * server, this is needed to stop chrome choking
 642                          */
 643 #ifdef _WIN32
 644                         Sleep(1);
 645 #else
 646                         usleep(1);
 647 #endif
 648                 }
 649                 break;
 650
 651         case LWS_CALLBACK_RECEIVE:
 652
 653                 if (((ringbuffer_head - pss->ringbuffer_tail) &
 654                                   (MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 1)) {
 655                         lwsl_err("dropping!\n");
 656                         goto choke;
 657                 }
 658
 659                 if (ringbuffer[ringbuffer_head].payload)
 660                         free(ringbuffer[ringbuffer_head].payload);
 661
 662                 ringbuffer[ringbuffer_head].payload =
 663                                 malloc(LWS_SEND_BUFFER_PRE_PADDING + len +
 664                                                   LWS_SEND_BUFFER_POST_PADDING);
 665                 ringbuffer[ringbuffer_head].len = len;
 666                 memcpy((char *)ringbuffer[ringbuffer_head].payload +
 667                                           LWS_SEND_BUFFER_PRE_PADDING, in, len);
 668                 if (ringbuffer_head == (MAX_MESSAGE_QUEUE - 1))
 669                         ringbuffer_head = 0;
 670                 else
 671                         ringbuffer_head++;
 672
 673                 if (((ringbuffer_head - pss->ringbuffer_tail) &
 674                                   (MAX_MESSAGE_QUEUE - 1)) != (MAX_MESSAGE_QUEUE - 2))
 675                         goto done;
 676
 677 choke:
 678                 lwsl_debug("LWS_CALLBACK_RECEIVE: throttling %p\n", wsi);
 679                 libwebsocket_rx_flow_control(wsi, 0);
 680
 681 //              lwsl_debug("rx fifo %d\n", (ringbuffer_head - pss->ringbuffer_tail) & (MAX_MESSAGE_QUEUE - 1));
 682 done:
 683                 libwebsocket_callback_on_writable_all_protocol(
 684                                                libwebsockets_get_protocol(wsi));
 685                 break;
 686
 687         /*
 688          * this just demonstrates how to use the protocol filter. If you won't
 689          * study and reject connections based on header content, you don't need
 690          * to handle this callback
 691          */
 692
 693         case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
 694                 dump_handshake_info(wsi);
 695                 /* you could return non-zero here and kill the connection */
 696                 break;
 697
 698         default:
 699                 break;
 700         }
 701
 702         return 0;
 703 }
 704
 705
 706 /* list of supported protocols and callbacks */
 707
 708 static struct libwebsocket_protocols protocols[] = {
 709         /* first protocol must always be HTTP handler */
 710
 711         {
 712                 "http-only",            /* name */
 713                 callback_http,          /* callback */
 714                 sizeof (struct per_session_data__http), /* per_session_data_size */
 715                 0,                      /* max frame size / rx buffer */
 716         },
 717         {
 718                 "dumb-increment-protocol",
 719                 callback_dumb_increment,
 720                 sizeof(struct per_session_data__dumb_increment),
 721                 10,
 722         },
 723         {
 724                 "lws-mirror-protocol",
 725                 callback_lws_mirror,
 726                 sizeof(struct per_session_data__lws_mirror),
 727                 128,
 728         },
 729         { NULL, NULL, 0, 0 } /* terminator */
 730 };
 731
 732 void sighandler(int sig)
 733 {
 734         force_exit = 1;
 735         libwebsocket_cancel_service(context);
 736 }
 737
 738 static struct option options[] = {
 739         { "help",       no_argument,            NULL, 'h' },
 740         { "debug",      required_argument,      NULL, 'd' },
 741         { "port",       required_argument,      NULL, 'p' },
 742         { "ssl",        no_argument,            NULL, 's' },
 743         { "allow-non-ssl",      no_argument,            NULL, 'a' },
 744         { "interface",  required_argument,      NULL, 'i' },
 745         { "closetest",  no_argument,            NULL, 'c' },
 746         { "libev",  no_argument,                NULL, 'e' },
 747         #ifndef LWS_NO_DAEMONIZE
 748         { "daemonize",  no_argument,            NULL, 'D' },
 749 #endif
 750         { "resource_path", required_argument,           NULL, 'r' },
 751         { NULL, 0, 0, 0 }
 752 };
 753
 754 int main(int argc, char **argv)
 755 {
 756         char cert_path[1024];
 757         char key_path[1024];
 758         int n = 0;
 759         int use_ssl = 0;
 760         int opts = 0;
 761         char interface_name[128] = "";
 762         const char *iface = NULL;
 763 #ifndef WIN32
 764         int syslog_options = LOG_PID | LOG_PERROR;
 765 #endif
 766         unsigned int oldus = 0;
 767         struct lws_context_creation_info info;
 768
 769         int debug_level = 7;
 770 #ifndef LWS_NO_DAEMONIZE
 771         int daemonize = 0;
 772 #endif
 773
 774         memset(&info, 0, sizeof info);
 775         info.port = 7681;
 776
 777         while (n >= 0) {
 778                 n = getopt_long(argc, argv, "eci:hsap:d:Dr:", options, NULL);
 779                 if (n < 0)
 780                         continue;
 781                 switch (n) {
 782                 case 'e':
 783                         opts |= LWS_SERVER_OPTION_LIBEV;
 784                         break;
 785 #ifndef LWS_NO_DAEMONIZE
 786                 case 'D':
 787                         daemonize = 1;
 788                         #ifndef WIN32
 789                         syslog_options &= ~LOG_PERROR;
 790                         #endif
 791                         break;
 792 #endif
 793                 case 'd':
 794                         debug_level = atoi(optarg);
 795                         break;
 796                 case 's':
 797                         use_ssl = 1;
 798                         break;
 799                 case 'a':
 800                         opts |= LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT;
 801                         break;
 802                 case 'p':
 803                         info.port = atoi(optarg);
 804                         break;
 805                 case 'i':
 806                         strncpy(interface_name, optarg, sizeof interface_name);
 807                         interface_name[(sizeof interface_name) - 1] = '\0';
 808                         iface = interface_name;
 809                         break;
 810                 case 'c':
 811                         close_testing = 1;
 812                         fprintf(stderr, " Close testing mode -- closes on "
 813                                            "client after 50 dumb increments"
 814                                            "and suppresses lws_mirror spam\n");
 815                         break;
 816                 case 'r':
 817                         resource_path = optarg;
 818                         printf("Setting resource path to \"%s\"\n", resource_path);
 819                         break;
 820                 case 'h':
 821                         fprintf(stderr, "Usage: test-server "
 822                                         "[--port=<p>] [--ssl] "
 823                                         "[-d <log bitfield>] "
 824                                         "[--resource_path <path>]\n");
 825                         exit(1);
 826                 }
 827         }
 828
 829 #if !defined(LWS_NO_DAEMONIZE) && !defined(WIN32)
 830         /*
 831          * normally lock path would be /var/lock/lwsts or similar, to
 832          * simplify getting started without having to take care about
 833          * permissions or running as root, set to /tmp/.lwsts-lock
 834          */
 835         if (daemonize && lws_daemonize("/tmp/.lwsts-lock")) {
 836                 fprintf(stderr, "Failed to daemonize\n");
 837                 return 1;
 838         }
 839 #endif
 840
 841         signal(SIGINT, sighandler);
 842
 843 #ifndef WIN32
 844         /* we will only try to log things according to our debug_level */
 845         setlogmask(LOG_UPTO (LOG_DEBUG));
 846         openlog("lwsts", syslog_options, LOG_DAEMON);
 847 #endif
 848
 849         /* tell the library what debug level to emit and to send it to syslog */
 850         lws_set_log_level(debug_level, lwsl_emit_syslog);
 851
 852         lwsl_notice("libwebsockets test server - "
 853                         "(C) Copyright 2010-2013 Andy Green <andy@warmcat.com> - "
 854                                                     "licensed under LGPL2.1\n");
 855 #ifdef EXTERNAL_POLL
 856         max_poll_elements = getdtablesize();
 857         pollfds = malloc(max_poll_elements * sizeof (struct pollfd));
 858         fd_lookup = malloc(max_poll_elements * sizeof (int));
 859         if (pollfds == NULL || fd_lookup == NULL) {
 860                 lwsl_err("Out of memory pollfds=%d\n", max_poll_elements);
 861                 return -1;
 862         }
 863 #endif
 864
 865         info.iface = iface;
 866         info.protocols = protocols;
 867 #ifndef LWS_NO_EXTENSIONS
 868         info.extensions = libwebsocket_get_internal_extensions();
 869 #endif
 870         if (!use_ssl) {
 871                 info.ssl_cert_filepath = NULL;
 872                 info.ssl_private_key_filepath = NULL;
 873         } else {
 874                 if (strlen(resource_path) > sizeof(cert_path) - 32) {
 875                         lwsl_err("resource path too long\n");
 876                         return -1;
 877                 }
 878                 sprintf(cert_path, "%s/libwebsockets-test-server.pem",
 879                                                                 resource_path);
 880                 if (strlen(resource_path) > sizeof(key_path) - 32) {
 881                         lwsl_err("resource path too long\n");
 882                         return -1;
 883                 }
 884                 sprintf(key_path, "%s/libwebsockets-test-server.key.pem",
 885                                                                 resource_path);
 886
 887                 info.ssl_cert_filepath = cert_path;
 888                 info.ssl_private_key_filepath = key_path;
 889         }
 890         info.gid = -1;
 891         info.uid = -1;
 892         info.options = opts;
 893
 894         context = libwebsocket_create_context(&info);
 895         if (context == NULL) {
 896                 lwsl_err("libwebsocket init failed\n");
 897                 return -1;
 898         }
 899
 900         n = 0;
 901         while (n >= 0 && !force_exit) {
 902                 struct timeval tv;
 903
 904                 gettimeofday(&tv, NULL);
 905
 906                 /*
 907                  * This provokes the LWS_CALLBACK_SERVER_WRITEABLE for every
 908                  * live websocket connection using the DUMB_INCREMENT protocol,
 909                  * as soon as it can take more packets (usually immediately)
 910                  */
 911
 912                 if (((unsigned int)tv.tv_usec - oldus) > 50000) {
 913                         libwebsocket_callback_on_writable_all_protocol(&protocols[PROTOCOL_DUMB_INCREMENT]);
 914                         oldus = tv.tv_usec;
 915                 }
 916
 917 #ifdef EXTERNAL_POLL
 918
 919                 /*
 920                  * this represents an existing server's single poll action
 921                  * which also includes libwebsocket sockets
 922                  */
 923
 924                 n = poll(pollfds, count_pollfds, 50);
 925                 if (n < 0)
 926                         continue;
 927
 928
 929                 if (n)
 930                         for (n = 0; n < count_pollfds; n++)
 931                                 if (pollfds[n].revents)
 932                                         /*
 933                                         * returns immediately if the fd does not
 934                                         * match anything under libwebsockets
 935                                         * control
 936                                         */
 937                                         if (libwebsocket_service_fd(context,
 938                                                                   &pollfds[n]) < 0)
 939                                                 goto done;
 940 #else
 941                 /*
 942                  * If libwebsockets sockets are all we care about,
 943                  * you can use this api which takes care of the poll()
 944                  * and looping through finding who needed service.
 945                  *
 946                  * If no socket needs service, it'll return anyway after
 947                  * the number of ms in the second argument.
 948                  */
 949
 950                 n = libwebsocket_service(context, 50);
 951 #endif
 952         }
 953
 954 #ifdef EXTERNAL_POLL
 955 done:
 956 #endif
 957
 958         libwebsocket_context_destroy(context);
 959
 960         lwsl_notice("libwebsockets-test-server exited cleanly\n");
 961
 962 #ifndef WIN32
 963         closelog();
 964 #endif
 965
 966         return 0;
 967 }