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 <unistd.h>
  25 #include <getopt.h>
  26 #include <string.h>
  27 #include <signal.h>
  28
  29 #ifdef CMAKE_BUILD
  30 #include "lws_config.h"
  31 #endif
  32
  33 #include "../lib/libwebsockets.h"
  34
  35 static unsigned int opts;
  36 static int was_closed;
  37 static int deny_deflate;
  38 static int deny_mux;
  39 static struct libwebsocket *wsi_mirror;
  40 static int mirror_lifetime = 0;
  41 static int force_exit = 0;
  42
  43 /*
  44  * This demo shows how to connect multiple websockets simultaneously to a
  45  * websocket server (there is no restriction on their having to be the same
  46  * server just it simplifies the demo).
  47  *
  48  *  dumb-increment-protocol:  we connect to the server and print the number
  49  *                              we are given
  50  *
  51  *  lws-mirror-protocol: draws random circles, which are mirrored on to every
  52  *                              client (see them being drawn in every browser
  53  *                              session also using the test server)
  54  */
  55
  56 enum demo_protocols {
  57
  58         PROTOCOL_DUMB_INCREMENT,
  59         PROTOCOL_LWS_MIRROR,
  60
  61         /* always last */
  62         DEMO_PROTOCOL_COUNT
  63 };
  64
  65
  66 /* dumb_increment protocol */
  67
  68 static int
  69 callback_dumb_increment(struct libwebsocket_context *this,
  70                         struct libwebsocket *wsi,
  71                         enum libwebsocket_callback_reasons reason,
  72                                                void *user, void *in, size_t len)
  73 {
  74         switch (reason) {
  75
  76         case LWS_CALLBACK_CLOSED:
  77                 fprintf(stderr, "LWS_CALLBACK_CLOSED\n");
  78                 was_closed = 1;
  79                 break;
  80
  81         case LWS_CALLBACK_CLIENT_RECEIVE:
  82                 ((char *)in)[len] = '\0';
  83                 fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in);
  84                 break;
  85
  86         /* because we are protocols[0] ... */
  87
  88         case LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED:
  89                 if ((strcmp(in, "deflate-stream") == 0) && deny_deflate) {
  90                         fprintf(stderr, "denied deflate-stream extension\n");
  91                         return 1;
  92                 }
  93                 if ((strcmp(in, "deflate-frame") == 0) && deny_deflate) {
  94                         fprintf(stderr, "denied deflate-frame extension\n");
  95                         return 1;
  96                 }
  97                 if ((strcmp(in, "x-google-mux") == 0) && deny_mux) {
  98                         fprintf(stderr, "denied x-google-mux extension\n");
  99                         return 1;
 100                 }
 101
 102                 break;
 103
 104         default:
 105                 break;
 106         }
 107
 108         return 0;
 109 }
 110
 111
 112 /* lws-mirror_protocol */
 113
 114
 115 static int
 116 callback_lws_mirror(struct libwebsocket_context *context,
 117                         struct libwebsocket *wsi,
 118                         enum libwebsocket_callback_reasons reason,
 119                                                void *user, void *in, size_t len)
 120 {
 121         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 4096 +
 122                                                   LWS_SEND_BUFFER_POST_PADDING];
 123         int l = 0;
 124         int n;
 125
 126         switch (reason) {
 127
 128         case LWS_CALLBACK_CLOSED:
 129                 fprintf(stderr, "mirror: LWS_CALLBACK_CLOSED mirror_lifetime=%d\n", mirror_lifetime);
 130                 wsi_mirror = NULL;
 131                 break;
 132
 133         case LWS_CALLBACK_CLIENT_ESTABLISHED:
 134
 135                 /*
 136                  * start the ball rolling,
 137                  * LWS_CALLBACK_CLIENT_WRITEABLE will come next service
 138                  */
 139
 140                 libwebsocket_callback_on_writable(context, wsi);
 141                 break;
 142
 143         case LWS_CALLBACK_CLIENT_RECEIVE:
 144 /*              fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in); */
 145                 break;
 146
 147         case LWS_CALLBACK_CLIENT_WRITEABLE:
 148
 149                 for (n = 0; n < 1; n++)
 150                         l += sprintf((char *)&buf[LWS_SEND_BUFFER_PRE_PADDING + l],
 151                                         "c #%06X %d %d %d;",
 152                                         (int)random() & 0xffffff,
 153                                         (int)random() % 500,
 154                                         (int)random() % 250,
 155                                         (int)random() % 24);
 156
 157                 n = libwebsocket_write(wsi,
 158                    &buf[LWS_SEND_BUFFER_PRE_PADDING], l, opts | LWS_WRITE_TEXT);
 159
 160                 if (n < 0)
 161                         return -1;
 162                 if (n < l) {
 163                         lwsl_err("Partial write LWS_CALLBACK_CLIENT_WRITEABLE\n");
 164                         return -1;
 165                 }
 166
 167                 mirror_lifetime--;
 168                 if (!mirror_lifetime) {
 169                         fprintf(stderr, "closing mirror session\n");
 170                         return -1;
 171                 } else
 172                         /* get notified as soon as we can write again */
 173                         libwebsocket_callback_on_writable(context, wsi);
 174                 break;
 175
 176         default:
 177                 break;
 178         }
 179
 180         return 0;
 181 }
 182
 183
 184 /* list of supported protocols and callbacks */
 185
 186 static struct libwebsocket_protocols protocols[] = {
 187         {
 188                 "dumb-increment-protocol",
 189                 callback_dumb_increment,
 190                 0,
 191                 20,
 192         },
 193         {
 194                 "lws-mirror-protocol",
 195                 callback_lws_mirror,
 196                 0,
 197                 128,
 198         },
 199         { NULL, NULL, 0, 0 } /* end */
 200 };
 201
 202 void sighandler(int sig)
 203 {
 204         force_exit = 1;
 205 }
 206
 207 static struct option options[] = {
 208         { "help",       no_argument,            NULL, 'h' },
 209         { "debug",      required_argument,      NULL, 'd' },
 210         { "port",       required_argument,      NULL, 'p' },
 211         { "ssl",        no_argument,            NULL, 's' },
 212         { "version",    required_argument,      NULL, 'v' },
 213         { "undeflated", no_argument,            NULL, 'u' },
 214         { "nomux",      no_argument,            NULL, 'n' },
 215         { "longlived",  no_argument,            NULL, 'l' },
 216         { NULL, 0, 0, 0 }
 217 };
 218
 219
 220 int main(int argc, char **argv)
 221 {
 222         int n = 0;
 223         int ret = 0;
 224         int port = 7681;
 225         int use_ssl = 0;
 226         struct libwebsocket_context *context;
 227         const char *address;
 228         struct libwebsocket *wsi_dumb;
 229         int ietf_version = -1; /* latest */
 230         int longlived = 0;
 231         struct lws_context_creation_info info;
 232
 233         memset(&info, 0, sizeof info);
 234
 235         fprintf(stderr, "libwebsockets test client\n"
 236                         "(C) Copyright 2010-2013 Andy Green <andy@warmcat.com> "
 237                                                     "licensed under LGPL2.1\n");
 238
 239         if (argc < 2)
 240                 goto usage;
 241
 242         while (n >= 0) {
 243                 n = getopt_long(argc, argv, "nuv:hsp:d:l", options, NULL);
 244                 if (n < 0)
 245                         continue;
 246                 switch (n) {
 247                 case 'd':
 248                         lws_set_log_level(atoi(optarg), NULL);
 249                         break;
 250                 case 's':
 251                         use_ssl = 2; /* 2 = allow selfsigned */
 252                         break;
 253                 case 'p':
 254                         port = atoi(optarg);
 255                         break;
 256                 case 'l':
 257                         longlived = 1;
 258                         break;
 259                 case 'v':
 260                         ietf_version = atoi(optarg);
 261                         break;
 262                 case 'u':
 263                         deny_deflate = 1;
 264                         break;
 265                 case 'n':
 266                         deny_mux = 1;
 267                         break;
 268                 case 'h':
 269                         goto usage;
 270                 }
 271         }
 272
 273         if (optind >= argc)
 274                 goto usage;
 275
 276         signal(SIGINT, sighandler);
 277
 278         address = argv[optind];
 279
 280         /*
 281          * create the websockets context.  This tracks open connections and
 282          * knows how to route any traffic and which protocol version to use,
 283          * and if each connection is client or server side.
 284          *
 285          * For this client-only demo, we tell it to not listen on any port.
 286          */
 287
 288         info.port = CONTEXT_PORT_NO_LISTEN;
 289         info.protocols = protocols;
 290 #ifndef LWS_NO_EXTENSIONS
 291         info.extensions = libwebsocket_get_internal_extensions();
 292 #endif
 293         info.gid = -1;
 294         info.uid = -1;
 295
 296         context = libwebsocket_create_context(&info);
 297         if (context == NULL) {
 298                 fprintf(stderr, "Creating libwebsocket context failed\n");
 299                 return 1;
 300         }
 301
 302         /* create a client websocket using dumb increment protocol */
 303
 304         wsi_dumb = libwebsocket_client_connect(context, address, port, use_ssl,
 305                         "/", argv[optind], argv[optind],
 306                          protocols[PROTOCOL_DUMB_INCREMENT].name, ietf_version);
 307
 308         if (wsi_dumb == NULL) {
 309                 fprintf(stderr, "libwebsocket dumb connect failed\n");
 310                 ret = 1;
 311                 goto bail;
 312         }
 313
 314         fprintf(stderr, "Websocket connections opened\n");
 315
 316         /*
 317          * sit there servicing the websocket context to handle incoming
 318          * packets, and drawing random circles on the mirror protocol websocket
 319          */
 320
 321         n = 0;
 322         while (n >= 0 && !was_closed && !force_exit) {
 323                 n = libwebsocket_service(context, 10);
 324
 325                 if (n < 0)
 326                         continue;
 327
 328                 if (wsi_mirror)
 329                         continue;
 330
 331                 /* create a client websocket using mirror protocol */
 332
 333                 wsi_mirror = libwebsocket_client_connect(context,
 334                         address, port, use_ssl,  "/",
 335                         argv[optind], argv[optind],
 336                         protocols[PROTOCOL_LWS_MIRROR].name, ietf_version);
 337
 338                 if (wsi_mirror == NULL) {
 339                         fprintf(stderr, "libwebsocket "
 340                                               "dumb connect failed\n");
 341                         ret = 1;
 342                         goto bail;
 343                 }
 344
 345                 mirror_lifetime = 10 + (random() & 1023);
 346                 /* useful to test single connection stability */
 347                 if (longlived)
 348                         mirror_lifetime += 50000;
 349
 350                 fprintf(stderr, "opened mirror connection with "
 351                                      "%d lifetime\n", mirror_lifetime);
 352
 353                 /*
 354                  * mirror_lifetime is decremented each send, when it reaches
 355                  * zero the connection is closed in the send callback.
 356                  * When the close callback comes, wsi_mirror is set to NULL
 357                  * so a new connection will be opened
 358                  */
 359         }
 360
 361 bail:
 362         fprintf(stderr, "Exiting\n");
 363
 364         libwebsocket_context_destroy(context);
 365
 366         return ret;
 367
 368 usage:
 369         fprintf(stderr, "Usage: libwebsockets-test-client "
 370                                 "<server address> [--port=<p>] "
 371                                 "[--ssl] [-k] [-v <ver>] "
 372                                 "[-d <log bitfield>] [-l]\n");
 373         return 1;
 374 }