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