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