test-server/test-client.c

   1 /*
   2  * libwebsockets-test-client - libwebsockets test implementation
   3  *
   4  * Copyright (C) 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
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <getopt.h>
  25 #include <string.h>
  26 #include <signal.h>
  27
  28 #ifdef _WIN32
  29 #define random rand
  30 #else
  31 #include <unistd.h>
  32 #endif
  33
  34 #ifdef CMAKE_BUILD
  35 #include "lws_config.h"
  36 #endif
  37
  38 #include "../lib/libwebsockets.h"
  39
  40 static unsigned int opts;
  41 static int was_closed;
  42 static int deny_deflate;
  43 static int deny_mux;
  44 static struct libwebsocket *wsi_mirror;
  45 static int mirror_lifetime = 0;
  46 static volatile int force_exit = 0;
  47 static int longlived = 0;
  48
  49 /*
  50  * This demo shows how to connect multiple websockets simultaneously to a
  51  * websocket server (there is no restriction on their having to be the same
  52  * server just it simplifies the demo).
  53  *
  54  *  dumb-increment-protocol:  we connect to the server and print the number
  55  *                              we are given
  56  *
  57  *  lws-mirror-protocol: draws random circles, which are mirrored on to every
  58  *                              client (see them being drawn in every browser
  59  *                              session also using the test server)
  60  */
  61
  62 enum demo_protocols {
  63
  64         PROTOCOL_DUMB_INCREMENT,
  65         PROTOCOL_LWS_MIRROR,
  66
  67         /* always last */
  68         DEMO_PROTOCOL_COUNT
  69 };
  70
  71
  72 /* dumb_increment protocol */
  73
  74 static int
  75 callback_dumb_increment(struct libwebsocket_context *this,
  76                         struct libwebsocket *wsi,
  77                         enum libwebsocket_callback_reasons reason,
  78                                                void *user, void *in, size_t len)
  79 {
  80         switch (reason) {
  81
  82         case LWS_CALLBACK_CLIENT_ESTABLISHED:
  83                 fprintf(stderr, "callback_dumb_increment: LWS_CALLBACK_CLIENT_ESTABLISHED\n");
  84                 break;
  85
  86         case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
  87                 fprintf(stderr, "LWS_CALLBACK_CLIENT_CONNECTION_ERROR\n");
  88                 was_closed = 1;
  89                 break;
  90
  91         case LWS_CALLBACK_CLOSED:
  92                 fprintf(stderr, "LWS_CALLBACK_CLOSED\n");
  93                 was_closed = 1;
  94                 break;
  95
  96         case LWS_CALLBACK_CLIENT_RECEIVE:
  97                 ((char *)in)[len] = '\0';
  98                 fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in);
  99                 break;
 100
 101         /* because we are protocols[0] ... */
 102
 103         case LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED:
 104                 if ((strcmp(in, "deflate-stream") == 0) && deny_deflate) {
 105                         fprintf(stderr, "denied deflate-stream extension\n");
 106                         return 1;
 107                 }
 108                 if ((strcmp(in, "deflate-frame") == 0) && deny_deflate) {
 109                         fprintf(stderr, "denied deflate-frame extension\n");
 110                         return 1;
 111                 }
 112                 if ((strcmp(in, "x-google-mux") == 0) && deny_mux) {
 113                         fprintf(stderr, "denied x-google-mux extension\n");
 114                         return 1;
 115                 }
 116
 117                 break;
 118
 119         default:
 120                 break;
 121         }
 122
 123         return 0;
 124 }
 125
 126
 127 /* lws-mirror_protocol */
 128
 129
 130 static int
 131 callback_lws_mirror(struct libwebsocket_context *context,
 132                         struct libwebsocket *wsi,
 133                         enum libwebsocket_callback_reasons reason,
 134                                                void *user, void *in, size_t len)
 135 {
 136         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 4096 +
 137                                                   LWS_SEND_BUFFER_POST_PADDING];
 138         int l = 0;
 139         int n;
 140         unsigned int rands[4];
 141
 142         switch (reason) {
 143
 144         case LWS_CALLBACK_CLIENT_ESTABLISHED:
 145
 146                 fprintf(stderr, "callback_lws_mirror: LWS_CALLBACK_CLIENT_ESTABLISHED\n");
 147
 148                 libwebsockets_get_random(context, rands, sizeof(rands[0]));
 149                 mirror_lifetime = 10 + (rands[0] & 1023);
 150                 /* useful to test single connection stability */
 151                 if (longlived)
 152                         mirror_lifetime += 50000;
 153
 154                 fprintf(stderr, "opened mirror connection with "
 155                                      "%d lifetime\n", mirror_lifetime);
 156
 157                 /*
 158                  * mirror_lifetime is decremented each send, when it reaches
 159                  * zero the connection is closed in the send callback.
 160                  * When the close callback comes, wsi_mirror is set to NULL
 161                  * so a new connection will be opened
 162                  */
 163
 164                 /*
 165                  * start the ball rolling,
 166                  * LWS_CALLBACK_CLIENT_WRITEABLE will come next service
 167                  */
 168
 169                 libwebsocket_callback_on_writable(context, wsi);
 170                 break;
 171
 172         case LWS_CALLBACK_CLOSED:
 173                 fprintf(stderr, "mirror: LWS_CALLBACK_CLOSED mirror_lifetime=%d\n", mirror_lifetime);
 174                 wsi_mirror = NULL;
 175                 break;
 176
 177         case LWS_CALLBACK_CLIENT_RECEIVE:
 178 /*              fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in); */
 179                 break;
 180
 181         case LWS_CALLBACK_CLIENT_WRITEABLE:
 182
 183                 for (n = 0; n < 1; n++) {
 184                         libwebsockets_get_random(context, rands, sizeof(rands));
 185                         l += sprintf((char *)&buf[LWS_SEND_BUFFER_PRE_PADDING + l],
 186                                         "c #%06X %d %d %d;",
 187                                         (int)rands[0] & 0xffffff,
 188                                         (int)rands[1] % 500,
 189                                         (int)rands[2] % 250,
 190                                         (int)rands[3] % 24);
 191                 }
 192
 193                 n = libwebsocket_write(wsi,
 194                    &buf[LWS_SEND_BUFFER_PRE_PADDING], l, opts | LWS_WRITE_TEXT);
 195
 196                 if (n < 0)
 197                         return -1;
 198                 if (n < l) {
 199                         lwsl_err("Partial write LWS_CALLBACK_CLIENT_WRITEABLE\n");
 200                         return -1;
 201                 }
 202
 203                 mirror_lifetime--;
 204                 if (!mirror_lifetime) {
 205                         fprintf(stderr, "closing mirror session\n");
 206                         return -1;
 207                 } else
 208                         /* get notified as soon as we can write again */
 209                         libwebsocket_callback_on_writable(context, wsi);
 210                 break;
 211
 212         default:
 213                 break;
 214         }
 215
 216         return 0;
 217 }
 218
 219
 220 /* list of supported protocols and callbacks */
 221
 222 static struct libwebsocket_protocols protocols[] = {
 223         {
 224                 "dumb-increment-protocol,fake-nonexistant-protocol",
 225                 callback_dumb_increment,
 226                 0,
 227                 20,
 228         },
 229         {
 230                 "fake-nonexistant-protocol,lws-mirror-protocol",
 231                 callback_lws_mirror,
 232                 0,
 233                 128,
 234         },
 235         { NULL, NULL, 0, 0 } /* end */
 236 };
 237
 238 void sighandler(int sig)
 239 {
 240         force_exit = 1;
 241 }
 242
 243 static struct option options[] = {
 244         { "help",       no_argument,            NULL, 'h' },
 245         { "debug",      required_argument,      NULL, 'd' },
 246         { "port",       required_argument,      NULL, 'p' },
 247         { "ssl",        no_argument,            NULL, 's' },
 248         { "version",    required_argument,      NULL, 'v' },
 249         { "undeflated", no_argument,            NULL, 'u' },
 250         { "nomux",      no_argument,            NULL, 'n' },
 251         { "longlived",  no_argument,            NULL, 'l' },
 252         { NULL, 0, 0, 0 }
 253 };
 254
 255
 256 int main(int argc, char **argv)
 257 {
 258         int n = 0;
 259         int ret = 0;
 260         int port = 7681;
 261         int use_ssl = 0;
 262         struct libwebsocket_context *context;
 263         const char *address;
 264         struct libwebsocket *wsi_dumb;
 265         int ietf_version = -1; /* latest */
 266         struct lws_context_creation_info info;
 267
 268         memset(&info, 0, sizeof info);
 269
 270         fprintf(stderr, "libwebsockets test client\n"
 271                         "(C) Copyright 2010-2015 Andy Green <andy@warmcat.com> "
 272                                                     "licensed under LGPL2.1\n");
 273
 274         if (argc < 2)
 275                 goto usage;
 276
 277         while (n >= 0) {
 278                 n = getopt_long(argc, argv, "nuv:hsp:d:l", options, NULL);
 279                 if (n < 0)
 280                         continue;
 281                 switch (n) {
 282                 case 'd':
 283                         lws_set_log_level(atoi(optarg), NULL);
 284                         break;
 285                 case 's':
 286                         use_ssl = 2; /* 2 = allow selfsigned */
 287                         break;
 288                 case 'p':
 289                         port = atoi(optarg);
 290                         break;
 291                 case 'l':
 292                         longlived = 1;
 293                         break;
 294                 case 'v':
 295                         ietf_version = atoi(optarg);
 296                         break;
 297                 case 'u':
 298                         deny_deflate = 1;
 299                         break;
 300                 case 'n':
 301                         deny_mux = 1;
 302                         break;
 303                 case 'h':
 304                         goto usage;
 305                 }
 306         }
 307
 308         if (optind >= argc)
 309                 goto usage;
 310
 311         signal(SIGINT, sighandler);
 312
 313         address = argv[optind];
 314
 315         /*
 316          * create the websockets context.  This tracks open connections and
 317          * knows how to route any traffic and which protocol version to use,
 318          * and if each connection is client or server side.
 319          *
 320          * For this client-only demo, we tell it to not listen on any port.
 321          */
 322
 323         info.port = CONTEXT_PORT_NO_LISTEN;
 324         info.protocols = protocols;
 325 #ifndef LWS_NO_EXTENSIONS
 326         info.extensions = libwebsocket_get_internal_extensions();
 327 #endif
 328         info.gid = -1;
 329         info.uid = -1;
 330
 331         context = libwebsocket_create_context(&info);
 332         if (context == NULL) {
 333                 fprintf(stderr, "Creating libwebsocket context failed\n");
 334                 return 1;
 335         }
 336
 337         /* create a client websocket using dumb increment protocol */
 338
 339         wsi_dumb = libwebsocket_client_connect(context, address, port, use_ssl,
 340                         "/", argv[optind], argv[optind],
 341                          protocols[PROTOCOL_DUMB_INCREMENT].name, ietf_version);
 342
 343         if (wsi_dumb == NULL) {
 344                 fprintf(stderr, "libwebsocket connect failed\n");
 345                 ret = 1;
 346                 goto bail;
 347         }
 348
 349         fprintf(stderr, "Waiting for connect...\n");
 350
 351         /*
 352          * sit there servicing the websocket context to handle incoming
 353          * packets, and drawing random circles on the mirror protocol websocket
 354          * nothing happens until the client websocket connection is
 355          * asynchronously established
 356          */
 357
 358         n = 0;
 359         while (n >= 0 && !was_closed && !force_exit) {
 360                 n = libwebsocket_service(context, 10);
 361
 362                 if (n < 0)
 363                         continue;
 364
 365                 if (wsi_mirror)
 366                         continue;
 367
 368                 /* create a client websocket using mirror protocol */
 369
 370                 wsi_mirror = libwebsocket_client_connect(context,
 371                         address, port, use_ssl,  "/",
 372                         argv[optind], argv[optind],
 373                         protocols[PROTOCOL_LWS_MIRROR].name, ietf_version);
 374
 375                 if (wsi_mirror == NULL) {
 376                         fprintf(stderr, "libwebsocket "
 377                                               "mirror connect failed\n");
 378                         ret = 1;
 379                         goto bail;
 380                 }
 381         }
 382
 383 bail:
 384         fprintf(stderr, "Exiting\n");
 385
 386         libwebsocket_context_destroy(context);
 387
 388         return ret;
 389
 390 usage:
 391         fprintf(stderr, "Usage: libwebsockets-test-client "
 392                                 "<server address> [--port=<p>] "
 393                                 "[--ssl] [-k] [-v <ver>] "
 394                                 "[-d <log bitfield>] [-l]\n");
 395         return 1;
 396 }