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         { "port",       required_argument,      NULL, 'p' },
 191         { "ssl",        no_argument,            NULL, 's' },
 192         { "killmask",   no_argument,            NULL, 'k' },
 193         { "version",    required_argument,      NULL, 'v' },
 194         { "undeflated", no_argument,            NULL, 'u' },
 195         { "nomux",      no_argument,            NULL, 'n' },
 196         { NULL, 0, 0, 0 }
 197 };
 198
 199
 200 int main(int argc, char **argv)
 201 {
 202         int n = 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 mirror_lifetime = 0;
 210
 211         fprintf(stderr, "libwebsockets test client\n"
 212                         "(C) Copyright 2010 Andy Green <andy@warmcat.com> "
 213                                                     "licensed under LGPL2.1\n");
 214
 215         if (argc < 2)
 216                 goto usage;
 217
 218         while (n >= 0) {
 219                 n = getopt_long(argc, argv, "nuv:khsp:", options, NULL);
 220                 if (n < 0)
 221                         continue;
 222                 switch (n) {
 223                 case 's':
 224                         use_ssl = 2; /* 2 = allow selfsigned */
 225                         break;
 226                 case 'p':
 227                         port = atoi(optarg);
 228                         break;
 229                 case 'k':
 230                         opts = LWS_WRITE_CLIENT_IGNORE_XOR_MASK;
 231                         break;
 232                 case 'v':
 233                         ietf_version = atoi(optarg);
 234                         break;
 235                 case 'u':
 236                         deny_deflate = 1;
 237                         break;
 238                 case 'n':
 239                         deny_mux = 1;
 240                         break;
 241                 case 'h':
 242                         goto usage;
 243                 }
 244         }
 245
 246         if (optind >= argc)
 247                 goto usage;
 248
 249         address = argv[optind];
 250
 251         /*
 252          * create the websockets context.  This tracks open connections and
 253          * knows how to route any traffic and which protocol version to use,
 254          * and if each connection is client or server side.
 255          *
 256          * For this client-only demo, we tell it to not listen on any port.
 257          */
 258
 259         context = libwebsocket_create_context(CONTEXT_PORT_NO_LISTEN, NULL,
 260                                 protocols, libwebsocket_internal_extensions,
 261                                                          NULL, NULL, -1, -1, 0);
 262         if (context == NULL) {
 263                 fprintf(stderr, "Creating libwebsocket context failed\n");
 264                 return 1;
 265         }
 266
 267
 268         /* create a client websocket using dumb increment protocol */
 269
 270         wsi_dumb = libwebsocket_client_connect(context, address, port, use_ssl,
 271                         "/", argv[optind], argv[optind],
 272                          protocols[PROTOCOL_DUMB_INCREMENT].name, ietf_version);
 273
 274         if (wsi_dumb == NULL) {
 275                 fprintf(stderr, "libwebsocket dumb connect failed\n");
 276                 return -1;
 277         }
 278
 279         fprintf(stderr, "Websocket connections opened\n");
 280
 281         /*
 282          * sit there servicing the websocket context to handle incoming
 283          * packets, and drawing random circles on the mirror protocol websocket
 284          */
 285
 286         n = 0;
 287         while (n >= 0 && !was_closed) {
 288                 n = libwebsocket_service(context, 1000);
 289
 290                 if (n < 0)
 291                         continue;
 292
 293                 if (wsi_mirror == NULL) {
 294
 295                         /* create a client websocket using mirror protocol */
 296
 297                         wsi_mirror = libwebsocket_client_connect(context,
 298                                 address, port, use_ssl,  "/",
 299                                 argv[optind], argv[optind],
 300                                 protocols[PROTOCOL_LWS_MIRROR].name,
 301                                                                  ietf_version);
 302
 303                         if (wsi_mirror == NULL) {
 304                                 fprintf(stderr, "libwebsocket "
 305                                                       "dumb connect failed\n");
 306                                 return -1;
 307                         }
 308
 309                         mirror_lifetime = 10 + (random() & 1023);
 310
 311                         fprintf(stderr, "opened mirror connection with "
 312                                              "%d lifetime\n", mirror_lifetime);
 313
 314                 } else {
 315
 316                         mirror_lifetime--;
 317                         if (mirror_lifetime == 0) {
 318                                 fprintf(stderr, "closing mirror session\n");
 319                                 libwebsocket_close_and_free_session(context,
 320                                         wsi_mirror, LWS_CLOSE_STATUS_GOINGAWAY);
 321
 322                                 /*
 323                                  * wsi_mirror will get set to NULL in
 324                                  * callback when close completes
 325                                  */
 326                         }
 327                 }
 328         }
 329
 330         fprintf(stderr, "Exiting\n");
 331
 332         libwebsocket_context_destroy(context);
 333
 334         return 0;
 335
 336 usage:
 337         fprintf(stderr, "Usage: libwebsockets-test-client "
 338                                              "<server address> [--port=<p>] "
 339                                              "[--ssl] [-k] [-v <ver>]\n");
 340         return 1;
 341 }