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