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 #ifndef _WIN32
  29 #include <unistd.h>
  30 #endif
  31
  32 #ifdef CMAKE_BUILD
  33 #include "lws_config.h"
  34 #endif
  35
  36 #include "../lib/libwebsockets.h"
  37
  38 static unsigned int opts;
  39 static int was_closed;
  40 static int deny_deflate;
  41 static int deny_mux;
  42 static struct libwebsocket *wsi_mirror;
  43 static int mirror_lifetime = 0;
  44 static volatile int force_exit = 0;
  45 static int longlived = 0;
  46
  47 /*
  48  * This demo shows how to connect multiple websockets simultaneously to a
  49  * websocket server (there is no restriction on their having to be the same
  50  * server just it simplifies the demo).
  51  *
  52  *  dumb-increment-protocol:  we connect to the server and print the number
  53  *                              we are given
  54  *
  55  *  lws-mirror-protocol: draws random circles, which are mirrored on to every
  56  *                              client (see them being drawn in every browser
  57  *                              session also using the test server)
  58  */
  59
  60 enum demo_protocols {
  61
  62         PROTOCOL_DUMB_INCREMENT,
  63         PROTOCOL_LWS_MIRROR,
  64
  65         /* always last */
  66         DEMO_PROTOCOL_COUNT
  67 };
  68
  69
  70 /* dumb_increment protocol */
  71
  72 static int
  73 callback_dumb_increment(struct libwebsocket_context *this,
  74                         struct libwebsocket *wsi,
  75                         enum libwebsocket_callback_reasons reason,
  76                                                void *user, void *in, size_t len)
  77 {
  78         switch (reason) {
  79
  80         case LWS_CALLBACK_CLIENT_ESTABLISHED:
  81                 fprintf(stderr, "callback_dumb_increment: LWS_CALLBACK_CLIENT_ESTABLISHED\n");
  82                 break;
  83
  84         case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
  85                 fprintf(stderr, "LWS_CALLBACK_CLIENT_CONNECTION_ERROR\n");
  86                 was_closed = 1;
  87                 break;
  88
  89         case LWS_CALLBACK_CLOSED:
  90                 fprintf(stderr, "LWS_CALLBACK_CLOSED\n");
  91                 was_closed = 1;
  92                 break;
  93
  94         case LWS_CALLBACK_CLIENT_RECEIVE:
  95                 ((char *)in)[len] = '\0';
  96                 fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in);
  97                 break;
  98
  99         /* because we are protocols[0] ... */
 100
 101         case LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED:
 102                 if ((strcmp(in, "deflate-stream") == 0) && deny_deflate) {
 103                         fprintf(stderr, "denied deflate-stream extension\n");
 104                         return 1;
 105                 }
 106                 if ((strcmp(in, "deflate-frame") == 0) && deny_deflate) {
 107                         fprintf(stderr, "denied deflate-frame extension\n");
 108                         return 1;
 109                 }
 110                 if ((strcmp(in, "x-google-mux") == 0) && deny_mux) {
 111                         fprintf(stderr, "denied x-google-mux extension\n");
 112                         return 1;
 113                 }
 114
 115                 break;
 116
 117         default:
 118                 break;
 119         }
 120
 121         return 0;
 122 }
 123
 124
 125 /* lws-mirror_protocol */
 126
 127
 128 static int
 129 callback_lws_mirror(struct libwebsocket_context *context,
 130                         struct libwebsocket *wsi,
 131                         enum libwebsocket_callback_reasons reason,
 132                                                void *user, void *in, size_t len)
 133 {
 134         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 4096 +
 135                                                   LWS_SEND_BUFFER_POST_PADDING];
 136         int l = 0;
 137         int n;
 138
 139         switch (reason) {
 140
 141         case LWS_CALLBACK_CLIENT_ESTABLISHED:
 142
 143                 fprintf(stderr, "callback_lws_mirror: LWS_CALLBACK_CLIENT_ESTABLISHED\n");
 144
 145                 mirror_lifetime = 10 + (random() & 1023);
 146                 /* useful to test single connection stability */
 147                 if (longlived)
 148                         mirror_lifetime += 50000;
 149
 150                 fprintf(stderr, "opened mirror connection with "
 151                                      "%d lifetime\n", mirror_lifetime);
 152
 153                 /*
 154                  * mirror_lifetime is decremented each send, when it reaches
 155                  * zero the connection is closed in the send callback.
 156                  * When the close callback comes, wsi_mirror is set to NULL
 157                  * so a new connection will be opened
 158                  */
 159
 160                 /*
 161                  * start the ball rolling,
 162                  * LWS_CALLBACK_CLIENT_WRITEABLE will come next service
 163                  */
 164
 165                 libwebsocket_callback_on_writable(context, wsi);
 166                 break;
 167
 168         case LWS_CALLBACK_CLOSED:
 169                 fprintf(stderr, "mirror: LWS_CALLBACK_CLOSED mirror_lifetime=%d\n", mirror_lifetime);
 170                 wsi_mirror = NULL;
 171                 break;
 172
 173         case LWS_CALLBACK_CLIENT_RECEIVE:
 174 /*              fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in); */
 175                 break;
 176
 177         case LWS_CALLBACK_CLIENT_WRITEABLE:
 178
 179                 for (n = 0; n < 1; n++)
 180                         l += sprintf((char *)&buf[LWS_SEND_BUFFER_PRE_PADDING + l],
 181                                         "c #%06X %d %d %d;",
 182                                         (int)random() & 0xffffff,
 183                                         (int)random() % 500,
 184                                         (int)random() % 250,
 185                                         (int)random() % 24);
 186
 187                 n = libwebsocket_write(wsi,
 188                    &buf[LWS_SEND_BUFFER_PRE_PADDING], l, opts | LWS_WRITE_TEXT);
 189
 190                 if (n < 0)
 191                         return -1;
 192                 if (n < l) {
 193                         lwsl_err("Partial write LWS_CALLBACK_CLIENT_WRITEABLE\n");
 194                         return -1;
 195                 }
 196
 197                 mirror_lifetime--;
 198                 if (!mirror_lifetime) {
 199                         fprintf(stderr, "closing mirror session\n");
 200                         return -1;
 201                 } else
 202                         /* get notified as soon as we can write again */
 203                         libwebsocket_callback_on_writable(context, wsi);
 204                 break;
 205
 206         default:
 207                 break;
 208         }
 209
 210         return 0;
 211 }
 212
 213
 214 /* list of supported protocols and callbacks */
 215
 216 static struct libwebsocket_protocols protocols[] = {
 217         {
 218                 "dumb-increment-protocol",
 219                 callback_dumb_increment,
 220                 0,
 221                 20,
 222         },
 223         {
 224                 "lws-mirror-protocol",
 225                 callback_lws_mirror,
 226                 0,
 227                 128,
 228         },
 229         { NULL, NULL, 0, 0 } /* end */
 230 };
 231
 232 void sighandler(int sig)
 233 {
 234         force_exit = 1;
 235 }
 236
 237 static struct option options[] = {
 238         { "help",       no_argument,            NULL, 'h' },
 239         { "debug",      required_argument,      NULL, 'd' },
 240         { "port",       required_argument,      NULL, 'p' },
 241         { "ssl",        no_argument,            NULL, 's' },
 242         { "version",    required_argument,      NULL, 'v' },
 243         { "undeflated", no_argument,            NULL, 'u' },
 244         { "nomux",      no_argument,            NULL, 'n' },
 245         { "longlived",  no_argument,            NULL, 'l' },
 246         { NULL, 0, 0, 0 }
 247 };
 248
 249
 250 int main(int argc, char **argv)
 251 {
 252         int n = 0;
 253         int ret = 0;
 254         int port = 7681;
 255         int use_ssl = 0;
 256         struct libwebsocket_context *context;
 257         const char *address;
 258         struct libwebsocket *wsi_dumb;
 259         int ietf_version = -1; /* latest */
 260         struct lws_context_creation_info info;
 261
 262         memset(&info, 0, sizeof info);
 263
 264         fprintf(stderr, "libwebsockets test client\n"
 265                         "(C) Copyright 2010-2013 Andy Green <andy@warmcat.com> "
 266                                                     "licensed under LGPL2.1\n");
 267
 268         if (argc < 2)
 269                 goto usage;
 270
 271         while (n >= 0) {
 272                 n = getopt_long(argc, argv, "nuv:hsp:d:l", options, NULL);
 273                 if (n < 0)
 274                         continue;
 275                 switch (n) {
 276                 case 'd':
 277                         lws_set_log_level(atoi(optarg), NULL);
 278                         break;
 279                 case 's':
 280                         use_ssl = 2; /* 2 = allow selfsigned */
 281                         break;
 282                 case 'p':
 283                         port = atoi(optarg);
 284                         break;
 285                 case 'l':
 286                         longlived = 1;
 287                         break;
 288                 case 'v':
 289                         ietf_version = atoi(optarg);
 290                         break;
 291                 case 'u':
 292                         deny_deflate = 1;
 293                         break;
 294                 case 'n':
 295                         deny_mux = 1;
 296                         break;
 297                 case 'h':
 298                         goto usage;
 299                 }
 300         }
 301
 302         if (optind >= argc)
 303                 goto usage;
 304
 305         signal(SIGINT, sighandler);
 306
 307         address = argv[optind];
 308
 309         /*
 310          * create the websockets context.  This tracks open connections and
 311          * knows how to route any traffic and which protocol version to use,
 312          * and if each connection is client or server side.
 313          *
 314          * For this client-only demo, we tell it to not listen on any port.
 315          */
 316
 317         info.port = CONTEXT_PORT_NO_LISTEN;
 318         info.protocols = protocols;
 319 #ifndef LWS_NO_EXTENSIONS
 320         info.extensions = libwebsocket_get_internal_extensions();
 321 #endif
 322         info.gid = -1;
 323         info.uid = -1;
 324
 325         context = libwebsocket_create_context(&info);
 326         if (context == NULL) {
 327                 fprintf(stderr, "Creating libwebsocket context failed\n");
 328                 return 1;
 329         }
 330
 331         /* create a client websocket using dumb increment protocol */
 332
 333         wsi_dumb = libwebsocket_client_connect(context, address, port, use_ssl,
 334                         "/", argv[optind], argv[optind],
 335                          protocols[PROTOCOL_DUMB_INCREMENT].name, ietf_version);
 336
 337         if (wsi_dumb == NULL) {
 338                 fprintf(stderr, "libwebsocket connect failed\n");
 339                 ret = 1;
 340                 goto bail;
 341         }
 342
 343         fprintf(stderr, "Waiting for connect...\n");
 344
 345         /*
 346          * sit there servicing the websocket context to handle incoming
 347          * packets, and drawing random circles on the mirror protocol websocket
 348          * nothing happens until the client websocket connection is
 349          * asynchronously established
 350          */
 351
 352         n = 0;
 353         while (n >= 0 && !was_closed && !force_exit) {
 354                 n = libwebsocket_service(context, 10);
 355
 356                 if (n < 0)
 357                         continue;
 358
 359                 if (wsi_mirror)
 360                         continue;
 361
 362                 /* create a client websocket using mirror protocol */
 363
 364                 wsi_mirror = libwebsocket_client_connect(context,
 365                         address, port, use_ssl,  "/",
 366                         argv[optind], argv[optind],
 367                         protocols[PROTOCOL_LWS_MIRROR].name, ietf_version);
 368
 369                 if (wsi_mirror == NULL) {
 370                         fprintf(stderr, "libwebsocket "
 371                                               "mirror connect failed\n");
 372                         ret = 1;
 373                         goto bail;
 374                 }
 375         }
 376
 377 bail:
 378         fprintf(stderr, "Exiting\n");
 379
 380         libwebsocket_context_destroy(context);
 381
 382         return ret;
 383
 384 usage:
 385         fprintf(stderr, "Usage: libwebsockets-test-client "
 386                                 "<server address> [--port=<p>] "
 387                                 "[--ssl] [-k] [-v <ver>] "
 388                                 "[-d <log bitfield>] [-l]\n");
 389         return 1;
 390 }