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