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
  36 /*
  37  * This demo shows how to connect multiple websockets simultaneously to a
  38  * websocket server (there is no restriction on their having to be the same
  39  * server just it simplifies the demo).
  40  *
  41  *  dumb-increment-protocol:  we connect to the server and print the number
  42  *                              we are given
  43  *
  44  *  lws-mirror-protocol: draws random circles, which are mirrored on to every
  45  *                              client (see them being drawn in every browser
  46  *                              session also using the test server)
  47  */
  48
  49 enum demo_protocols {
  50
  51         PROTOCOL_DUMB_INCREMENT,
  52         PROTOCOL_LWS_MIRROR,
  53
  54         /* always last */
  55         DEMO_PROTOCOL_COUNT
  56 };
  57
  58
  59 /* dumb_increment protocol */
  60
  61 static int
  62 callback_dumb_increment(struct libwebsocket_context *this,
  63                         struct libwebsocket *wsi,
  64                         enum libwebsocket_callback_reasons reason,
  65                                                void *user, void *in, size_t len)
  66 {
  67         switch (reason) {
  68
  69         case LWS_CALLBACK_CLOSED:
  70                 fprintf(stderr, "LWS_CALLBACK_CLOSED\n");
  71                 was_closed = 1;
  72                 break;
  73
  74         case LWS_CALLBACK_CLIENT_RECEIVE:
  75                 ((char *)in)[len] = '\0';
  76                 fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in);
  77                 break;
  78
  79         /* because we are protocols[0] ... */
  80
  81         case LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED:
  82                 if ((strcmp(in, "deflate-stream") == 0) && deny_deflate) {
  83                         fprintf(stderr, "denied deflate-stream extension\n");
  84                         return 1;
  85                 }
  86                 if ((strcmp(in, "x-google-mux") == 0) && deny_mux) {
  87                         fprintf(stderr, "denied x-google-mux extension\n");
  88                         return 1;
  89                 }
  90
  91                 break;
  92
  93         default:
  94                 break;
  95         }
  96
  97         return 0;
  98 }
  99
 100
 101 /* lws-mirror_protocol */
 102
 103
 104 static int
 105 callback_lws_mirror(struct libwebsocket_context *this,
 106                         struct libwebsocket *wsi,
 107                         enum libwebsocket_callback_reasons reason,
 108                                                void *user, void *in, size_t len)
 109 {
 110         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 4096 +
 111                                                   LWS_SEND_BUFFER_POST_PADDING];
 112         int l;
 113
 114         switch (reason) {
 115
 116         case LWS_CALLBACK_CLOSED:
 117                 fprintf(stderr, "mirror: LWS_CALLBACK_CLOSED\n");
 118                 wsi_mirror = NULL;
 119                 break;
 120
 121         case LWS_CALLBACK_CLIENT_ESTABLISHED:
 122
 123                 /*
 124                  * start the ball rolling,
 125                  * LWS_CALLBACK_CLIENT_WRITEABLE will come next service
 126                  */
 127
 128                 libwebsocket_callback_on_writable(this, wsi);
 129                 break;
 130
 131         case LWS_CALLBACK_CLIENT_RECEIVE:
 132 /*              fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in); */
 133                 break;
 134
 135         case LWS_CALLBACK_CLIENT_WRITEABLE:
 136
 137                 l = sprintf((char *)&buf[LWS_SEND_BUFFER_PRE_PADDING],
 138                                         "c #%06X %d %d %d;",
 139                                         (int)random() & 0xffffff,
 140                                         (int)random() % 500,
 141                                         (int)random() % 250,
 142                                         (int)random() % 24);
 143
 144                 libwebsocket_write(wsi,
 145                    &buf[LWS_SEND_BUFFER_PRE_PADDING], l, opts | LWS_WRITE_TEXT);
 146
 147                 /* get notified as soon as we can write again */
 148
 149                 libwebsocket_callback_on_writable(this, wsi);
 150
 151                 /*
 152                  * without at least this delay, we choke the browser
 153                  * and the connection stalls, despite we now take care about
 154                  * flow control
 155                  */
 156
 157                 usleep(200);
 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         },
 176         {
 177                 "lws-mirror-protocol",
 178                 callback_lws_mirror,
 179                 0,
 180         },
 181         {  /* end of list */
 182                 NULL,
 183                 NULL,
 184                 0
 185         }
 186 };
 187
 188 static struct option options[] = {
 189         { "help",       no_argument,            NULL, 'h' },
 190         { "debug",      required_argument,      NULL, 'd' },
 191         { "port",       required_argument,      NULL, 'p' },
 192         { "ssl",        no_argument,            NULL, 's' },
 193         { "killmask",   no_argument,            NULL, 'k' },
 194         { "version",    required_argument,      NULL, 'v' },
 195         { "undeflated", no_argument,            NULL, 'u' },
 196         { "nomux",      no_argument,            NULL, 'n' },
 197         { NULL, 0, 0, 0 }
 198 };
 199
 200
 201 int main(int argc, char **argv)
 202 {
 203         int n = 0;
 204         int port = 7681;
 205         int use_ssl = 0;
 206         struct libwebsocket_context *context;
 207         const char *address;
 208         struct libwebsocket *wsi_dumb;
 209         int ietf_version = -1; /* latest */
 210         int mirror_lifetime = 0;
 211
 212         fprintf(stderr, "libwebsockets test client\n"
 213                         "(C) Copyright 2010-2013 Andy Green <andy@warmcat.com> "
 214                                                     "licensed under LGPL2.1\n");
 215
 216         if (argc < 2)
 217                 goto usage;
 218
 219         while (n >= 0) {
 220                 n = getopt_long(argc, argv, "nuv:khsp:d:", options, NULL);
 221                 if (n < 0)
 222                         continue;
 223                 switch (n) {
 224                 case 'd':
 225                         lws_set_log_level(atoi(optarg), NULL);
 226                         break;
 227                 case 's':
 228                         use_ssl = 2; /* 2 = allow selfsigned */
 229                         break;
 230                 case 'p':
 231                         port = atoi(optarg);
 232                         break;
 233                 case 'k':
 234                         opts = LWS_WRITE_CLIENT_IGNORE_XOR_MASK;
 235                         break;
 236                 case 'v':
 237                         ietf_version = atoi(optarg);
 238                         break;
 239                 case 'u':
 240                         deny_deflate = 1;
 241                         break;
 242                 case 'n':
 243                         deny_mux = 1;
 244                         break;
 245                 case 'h':
 246                         goto usage;
 247                 }
 248         }
 249
 250         if (optind >= argc)
 251                 goto usage;
 252
 253         address = argv[optind];
 254
 255         /*
 256          * create the websockets context.  This tracks open connections and
 257          * knows how to route any traffic and which protocol version to use,
 258          * and if each connection is client or server side.
 259          *
 260          * For this client-only demo, we tell it to not listen on any port.
 261          */
 262
 263         context = libwebsocket_create_context(CONTEXT_PORT_NO_LISTEN, NULL,
 264                                 protocols, libwebsocket_internal_extensions,
 265                                 NULL, NULL, NULL, -1, -1, 0, NULL);
 266         if (context == NULL) {
 267                 fprintf(stderr, "Creating libwebsocket context failed\n");
 268                 return 1;
 269         }
 270
 271         /* create a client websocket using dumb increment protocol */
 272
 273         wsi_dumb = libwebsocket_client_connect(context, address, port, use_ssl,
 274                         "/", argv[optind], argv[optind],
 275                          protocols[PROTOCOL_DUMB_INCREMENT].name, ietf_version);
 276
 277         if (wsi_dumb == NULL) {
 278                 fprintf(stderr, "libwebsocket dumb connect failed\n");
 279                 return -1;
 280         }
 281
 282         fprintf(stderr, "Websocket connections opened\n");
 283
 284         /*
 285          * sit there servicing the websocket context to handle incoming
 286          * packets, and drawing random circles on the mirror protocol websocket
 287          */
 288
 289         n = 0;
 290         while (n >= 0 && !was_closed) {
 291                 n = libwebsocket_service(context, 1000);
 292
 293                 if (n < 0)
 294                         continue;
 295
 296                 if (wsi_mirror == NULL) {
 297
 298                         /* create a client websocket using mirror protocol */
 299
 300                         wsi_mirror = libwebsocket_client_connect(context,
 301                                 address, port, use_ssl,  "/",
 302                                 argv[optind], argv[optind],
 303                                 protocols[PROTOCOL_LWS_MIRROR].name,
 304                                                                  ietf_version);
 305
 306                         if (wsi_mirror == NULL) {
 307                                 fprintf(stderr, "libwebsocket "
 308                                                       "dumb connect failed\n");
 309                                 return -1;
 310                         }
 311
 312                         mirror_lifetime = 10 + (random() & 1023);
 313
 314                         fprintf(stderr, "opened mirror connection with "
 315                                              "%d lifetime\n", mirror_lifetime);
 316
 317                 } else {
 318
 319                         mirror_lifetime--;
 320                         if (mirror_lifetime == 0) {
 321                                 fprintf(stderr, "closing mirror session\n");
 322                                 libwebsocket_close_and_free_session(context,
 323                                         wsi_mirror, LWS_CLOSE_STATUS_GOINGAWAY);
 324
 325                                 /*
 326                                  * wsi_mirror will get set to NULL in
 327                                  * callback when close completes
 328                                  */
 329                         }
 330                 }
 331         }
 332
 333         fprintf(stderr, "Exiting\n");
 334
 335         libwebsocket_context_destroy(context);
 336
 337         return 0;
 338
 339 usage:
 340         fprintf(stderr, "Usage: libwebsockets-test-client "
 341                                 "<server address> [--port=<p>] "
 342                                 "[--ssl] [-k] [-v <ver>] "
 343                                 "[-d <log bitfield>]\n");
 344         return 1;
 345 }