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