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 #include "lws_config.h"
  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         unsigned int rands[4];
 139
 140         switch (reason) {
 141
 142         case LWS_CALLBACK_CLIENT_ESTABLISHED:
 143
 144                 fprintf(stderr, "callback_lws_mirror: LWS_CALLBACK_CLIENT_ESTABLISHED\n");
 145
 146                 libwebsockets_get_random(context, rands, sizeof(rands[0]));
 147                 mirror_lifetime = 10 + (rands[0] & 1023);
 148                 /* useful to test single connection stability */
 149                 if (longlived)
 150                         mirror_lifetime += 50000;
 151
 152                 fprintf(stderr, "opened mirror connection with "
 153                                      "%d lifetime\n", mirror_lifetime);
 154
 155                 /*
 156                  * mirror_lifetime is decremented each send, when it reaches
 157                  * zero the connection is closed in the send callback.
 158                  * When the close callback comes, wsi_mirror is set to NULL
 159                  * so a new connection will be opened
 160                  */
 161
 162                 /*
 163                  * start the ball rolling,
 164                  * LWS_CALLBACK_CLIENT_WRITEABLE will come next service
 165                  */
 166
 167                 libwebsocket_callback_on_writable(context, wsi);
 168                 break;
 169
 170         case LWS_CALLBACK_CLOSED:
 171                 fprintf(stderr, "mirror: LWS_CALLBACK_CLOSED mirror_lifetime=%d\n", mirror_lifetime);
 172                 wsi_mirror = NULL;
 173                 break;
 174
 175         case LWS_CALLBACK_CLIENT_RECEIVE:
 176 /*              fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in); */
 177                 break;
 178
 179         case LWS_CALLBACK_CLIENT_WRITEABLE:
 180
 181                 for (n = 0; n < 1; n++) {
 182                         libwebsockets_get_random(context, rands, sizeof(rands));
 183                         l += sprintf((char *)&buf[LWS_SEND_BUFFER_PRE_PADDING + l],
 184                                         "c #%06X %d %d %d;",
 185                                         (int)rands[0] & 0xffffff,
 186                                         (int)rands[1] % 500,
 187                                         (int)rands[2] % 250,
 188                                         (int)rands[3] % 24);
 189                 }
 190
 191                 n = libwebsocket_write(wsi,
 192                    &buf[LWS_SEND_BUFFER_PRE_PADDING], l, opts | LWS_WRITE_TEXT);
 193
 194                 if (n < 0)
 195                         return -1;
 196                 if (n < l) {
 197                         lwsl_err("Partial write LWS_CALLBACK_CLIENT_WRITEABLE\n");
 198                         return -1;
 199                 }
 200
 201                 mirror_lifetime--;
 202                 if (!mirror_lifetime) {
 203                         fprintf(stderr, "closing mirror session\n");
 204                         return -1;
 205                 } else
 206                         /* get notified as soon as we can write again */
 207                         libwebsocket_callback_on_writable(context, wsi);
 208                 break;
 209
 210         default:
 211                 break;
 212         }
 213
 214         return 0;
 215 }
 216
 217
 218 /* list of supported protocols and callbacks */
 219
 220 static struct libwebsocket_protocols protocols[] = {
 221         {
 222                 "dumb-increment-protocol,fake-nonexistant-protocol",
 223                 callback_dumb_increment,
 224                 0,
 225                 20,
 226         },
 227         {
 228                 "fake-nonexistant-protocol,lws-mirror-protocol",
 229                 callback_lws_mirror,
 230                 0,
 231                 128,
 232         },
 233         { NULL, NULL, 0, 0 } /* end */
 234 };
 235
 236 void sighandler(int sig)
 237 {
 238         force_exit = 1;
 239 }
 240
 241 static struct option options[] = {
 242         { "help",       no_argument,            NULL, 'h' },
 243         { "debug",      required_argument,      NULL, 'd' },
 244         { "port",       required_argument,      NULL, 'p' },
 245         { "ssl",        no_argument,            NULL, 's' },
 246         { "version",    required_argument,      NULL, 'v' },
 247         { "undeflated", no_argument,            NULL, 'u' },
 248         { "nomux",      no_argument,            NULL, 'n' },
 249         { "longlived",  no_argument,            NULL, 'l' },
 250         { NULL, 0, 0, 0 }
 251 };
 252
 253
 254 int main(int argc, char **argv)
 255 {
 256         int n = 0;
 257         int ret = 0;
 258         int port = 7681;
 259         int use_ssl = 0;
 260         struct libwebsocket_context *context;
 261         const char *address;
 262         struct libwebsocket *wsi_dumb;
 263         int ietf_version = -1; /* latest */
 264         struct lws_context_creation_info info;
 265
 266         memset(&info, 0, sizeof info);
 267
 268         fprintf(stderr, "libwebsockets test client\n"
 269                         "(C) Copyright 2010-2015 Andy Green <andy@warmcat.com> "
 270                                                     "licensed under LGPL2.1\n");
 271
 272         if (argc < 2)
 273                 goto usage;
 274
 275         while (n >= 0) {
 276                 n = getopt_long(argc, argv, "nuv:hsp:d:l", options, NULL);
 277                 if (n < 0)
 278                         continue;
 279                 switch (n) {
 280                 case 'd':
 281                         lws_set_log_level(atoi(optarg), NULL);
 282                         break;
 283                 case 's':
 284                         use_ssl = 2; /* 2 = allow selfsigned */
 285                         break;
 286                 case 'p':
 287                         port = atoi(optarg);
 288                         break;
 289                 case 'l':
 290                         longlived = 1;
 291                         break;
 292                 case 'v':
 293                         ietf_version = atoi(optarg);
 294                         break;
 295                 case 'u':
 296                         deny_deflate = 1;
 297                         break;
 298                 case 'n':
 299                         deny_mux = 1;
 300                         break;
 301                 case 'h':
 302                         goto usage;
 303                 }
 304         }
 305
 306         if (optind >= argc)
 307                 goto usage;
 308
 309         signal(SIGINT, sighandler);
 310
 311         address = argv[optind];
 312
 313         /*
 314          * create the websockets context.  This tracks open connections and
 315          * knows how to route any traffic and which protocol version to use,
 316          * and if each connection is client or server side.
 317          *
 318          * For this client-only demo, we tell it to not listen on any port.
 319          */
 320
 321         info.port = CONTEXT_PORT_NO_LISTEN;
 322         info.protocols = protocols;
 323 #ifndef LWS_NO_EXTENSIONS
 324         info.extensions = libwebsocket_get_internal_extensions();
 325 #endif
 326         info.gid = -1;
 327         info.uid = -1;
 328
 329         context = libwebsocket_create_context(&info);
 330         if (context == NULL) {
 331                 fprintf(stderr, "Creating libwebsocket context failed\n");
 332                 return 1;
 333         }
 334
 335         /* create a client websocket using dumb increment protocol */
 336
 337         wsi_dumb = libwebsocket_client_connect(context, address, port, use_ssl,
 338                         "/", argv[optind], argv[optind],
 339                          protocols[PROTOCOL_DUMB_INCREMENT].name, ietf_version);
 340
 341         if (wsi_dumb == NULL) {
 342                 fprintf(stderr, "libwebsocket connect failed\n");
 343                 ret = 1;
 344                 goto bail;
 345         }
 346
 347         fprintf(stderr, "Waiting for connect...\n");
 348
 349         /*
 350          * sit there servicing the websocket context to handle incoming
 351          * packets, and drawing random circles on the mirror protocol websocket
 352          * nothing happens until the client websocket connection is
 353          * asynchronously established
 354          */
 355
 356         n = 0;
 357         while (n >= 0 && !was_closed && !force_exit) {
 358                 n = libwebsocket_service(context, 10);
 359
 360                 if (n < 0)
 361                         continue;
 362
 363                 if (wsi_mirror)
 364                         continue;
 365
 366                 /* create a client websocket using mirror protocol */
 367
 368                 wsi_mirror = libwebsocket_client_connect(context,
 369                         address, port, use_ssl,  "/",
 370                         argv[optind], argv[optind],
 371                         protocols[PROTOCOL_LWS_MIRROR].name, ietf_version);
 372
 373                 if (wsi_mirror == NULL) {
 374                         fprintf(stderr, "libwebsocket "
 375                                               "mirror connect failed\n");
 376                         ret = 1;
 377                         goto bail;
 378                 }
 379         }
 380
 381 bail:
 382         fprintf(stderr, "Exiting\n");
 383
 384         libwebsocket_context_destroy(context);
 385
 386         return ret;
 387
 388 usage:
 389         fprintf(stderr, "Usage: libwebsockets-test-client "
 390                                 "<server address> [--port=<p>] "
 391                                 "[--ssl] [-k] [-v <ver>] "
 392                                 "[-d <log bitfield>] [-l]\n");
 393         return 1;
 394 }